論文 - 菅野 敦史
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High-Speed Optical Transmission Technologies for In-Vehicle Networks 招待あり
Atsushi Kanno
The 32nd International Conference on Plastic Optical Fibers 1 - 3 2024年11月
担当区分：筆頭著者, 責任著者 記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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Radio over fiber: Convergence between radio and optical systems 招待あり
Atsushi Kanno
2024 Asia Communications and Photonics Conference 1 - 4 2024年11月
担当区分：筆頭著者, 責任著者 記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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Future G Metasurface Antenna Using Dual Axis Galvo Scanner for Free Space Optical Control 査読あり 国際誌
A. Bilal, A. Quddious, M. A. Antoniades, A. Kanno, P.T. Dat, K. Inagaki, T. Kawanishi, S. Iezekiel
Journal of Lightwave Technology 42 ( 21 ) 7476 - 7481 2024年11月
記述言語：英語 掲載種別：研究論文（学術雑誌）
その他リンク： https://opg.optica.org/jlt/abstract.cfm?uri=jlt-42-21-7476
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Radio Propagation Emulation Using Radio Over Multi-Mode Fiber Systems 査読あり
Atsushi Kanno, Tetsuya Kawanishi
2024 IEEE Conference on Antenna Measurements and Applications 1 - 2 2024年10月
担当区分：筆頭著者, 責任著者 記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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All-Photonic Fiber-Sub-THz System for 5G NR mmW Signal Transmission and Downconversion 査読あり
Pham Tien Dat, Yuya Yamaguchi, Keizo Inagaki, Atsushi Kanno, Tetsuya Kawanishi, Kouichi Akahane
2024 IEEE Conference on Antenna Measurements and Applications 1 - 2 2024年10月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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Fiber-Wireless System Using All-Photonic Transceiver for Tunable sub-THz Signal Generation and Down-conversion 査読あり
Pham Tien Dat, Yuya Yamaguchi, Shingo Takano, Shotaro Hirata, Junichiro Ichikawa, Ryo Shimizu, Keizo Inagaki, Yuki Yoshida, Atsushi Kanno, Tetsuya Kawanishi
2024 International Topical Meeting on Microwave Photonics (MWP) 1 - 4 2024年09月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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Metasurface Antenna for Gain and Bandwidth Enhancement in 28 GHz Radio-over-Fiber System 査読あり 国際共著
Asif Bilal, Pham Tien Dat, Marco A. Antoniades, Atsushi Kanno, Keizo Inagaki, Tetsuya Kawanishi, Stavros Iezekiel
2024 International Topical Meeting on Microwave Photonics (MWP) 1 - 4 2024年09月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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Clock-Data-Recovery-Based Delta-Sigma Modulation over Multi-Mode Fiber under Axis-Misalignment Condition 査読あり
Atsushi Kanno
2024 International Topical Meeting on Microwave Photonics (MWP) 1 - 3 2024年09月
担当区分：筆頭著者, 責任著者 記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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2-D PDA Based Spatial-Diversity Reception for Wide-FoV Mobile FSO System 査読あり
Zu-Kai Weng, Yuki Yoshida, Toshimasa Umezawa, Michikazu Hattori, Yukihiko Suga, Atsushi Matsumoto, Atsushi Kanno, Naokatsu Yamamoto, Tetsuya Kawanishi, Kouichi Akahane
2024 International Topical Meeting on Microwave Photonics (MWP) 1 - 4 2024年09月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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300 GHz-Band Radar System for High-Precision Landing Surface Imaging 査読あり
Naoki Sakamoto, Isao Morohashi, Atsushi Kanno, Norihiko Sekine
2024 49th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz) 1 - 2 2024年09月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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560 GHz wireless communication using soliton microcomb modes and photomixing with heterodyne detection 査読あり
Y. Tokizane, T. Kikuhara, Y. Makimoto, H. Kishikawa, Y. Okamura, K. Nishimoto, A. Kanno, S. Hisatake, N. Kuse, T. Yasui
2024 49th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz) 1 - 2 2024年09月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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200-GHz High-Power, High-Linearity, Photodetector for THz-Communication Applications in Beyond-5G 査読あり
Toshimasa Umezawa, Shinya Nakajima, Atsushi Matsumoto, Atsushi Kanno, Kouichi Akahane, Naokatsu Yamamoto
2024 49th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz) 1 - 2 2024年09月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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Optical Wavelength Tunability of Negative Refractive Index Transmission Line Phase Shifter 査読あり 国際共著
Asif Bilal; Abdul Quddious; Atsushi Kanno; Tetsuya Kawanishi; Marco A. Antoniades; Stavros Iezekiel
2024 IEEE International Symposium on Antennas and Propagation and INC/USNC‐URSI Radio Science Meeting (AP-S/INC-USNC-URSI) 743 - 744 2024年07月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
DOI： https://doi.org/10.1109/AP-S/INC-USNC-URSI52054.2024.10687214
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Multi-Stacked High-Speed PIN-PD for Compact Mobile Optical-Wireless Transceiver 査読あり
Toshimasa Umezawa, Shinya Nakajima, Abdelmoula Bekkali, Michikazu Hattori, Atsushi Matsumoto, Atsushi Kanno, Kouichi Akahane, Naokatsu Yamamoto
Journal of Lightwave Technology 21 ( 11 ) 4068 - 4075 2024年06月
記述言語：英語 掲載種別：研究論文（学術雑誌）
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Multi-Junction Type Large-Aperture High-Speed PIN-PD and its Characteristics for Optical Wireless Communications 査読あり
Toshimasa Umezawa, Atsushi Matsumoto, Atsushi Kanno, Kouichi Akahane, Naokatsu Yamamoto
2024 Conference on Lasers and Electro-Optics (CLEO) 1 - 2 2024年05月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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40-Gbit/s Mobile FSO with High-speed Beam Stabilizer and 2D-PDA-based Diversity Receiver for Support Robots. 査読あり
Zu-Kai Weng, Yuki Yoshida, Toshimasa Umezawa, Abdelmoula Bekkali, Michikazu Hattori, Atsushi Matsumoto, Atsushi Kanno, Naokatsu Yamamoto, Tetsuya Kawanishi, Kouichi Akahane
2024 Optical Fiber Communications Conference and Exhibition (OFC) 1 - 3 2024年03月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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Demonstration of Robust Mobile Free Space Optical System using High-speed Beam Tracking and 2D-PDA-based Spatial-Diversity Reception. 査読あり
Zu-Kai Weng, Yuki Yoshida, Toshimasa Umezawa, Abdelmoula Bekkali, Michikazu Hattori, Atsushi Matsumoto, Atsushi Kanno, Naokatsu Yamamoto, Tetsuya Kawanishi, Kouichi Akahane
2024 Optical Fiber Communications Conference and Exhibition (OFC) 1 - 3 2024年03月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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Thin-Film Lithium Niobate Modulator for a Flat Frequency-Response over 110 GHz Bandwidth with Integrated Electro-Optic Frequency-Domain Equalizer. 査読あり
Yuya Yamaguchi, Pham Tien Dat, Naokatsu Yamamoto, Kouichi Akahane, Atsushi Kanno, Tetsuya Kawanishi
2024 Optical Fiber Communications Conference and Exhibition (OFC) 1 - 3 2024年03月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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Application of Resonant-Cavity 4x4 Arrayed Photodetector for SDM-WDM-FSO Beam Detection
Toshimasa Umezawa, Atsushi Matsumoto, Atsushi Kanno, Kouichi Akahane, Naokatsu Yamamoto
Journal of Lightwave Technology 2024年02月
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Terahertz Signal Transparent Relay and Switching Using Photonic Technology
Pham Tien Dat, Yuya Yamaguchi, Shingo Takano, Shotaro Hirata, Junichiro Ichikawa, Ryo Shimizu, Keizo Inagaki, Isao Morohashi, Yuki Yoshida, Atsushi Kanno, Naokatsu Yamamoto, Tetsuya Kawanishi, Kouichi Akahane
Journal of Lightwave Technology 2024年02月
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Obstacle-tolerant terahertz wireless link using self-healing Bessel beams
Yu Katsuue, Ayumu Yabuki, Isao Morohashi, Atsushi Kanno, Norihiko Sekine, Junichi Nakajima, Shintaro Hisatake
Applied Physics Letters 2023年12月
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5G-NR Radio- and Power-Over-Fiber System Employing Multicore Fiber for Reconfigurable Metasurface Antenna Beam Steering
A. Bilal, A. Quddious, M. A. Antoniades, A. Kanno, P. T. Dat, K. Inagaki, T. Kawanishi, S. Iezekiel
Journal of Lightwave Technology 2023年12月
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Electro-Optic Modulator With Tunable Multimode Interference Couplers Based on LiNbO$_{3}$ Waveguides and Optical Single-Sideband Modulation
Shotaro Yasumori, Takanori Sato, Keita Morimoto, Tadashi Kawai, Akira Enokihara, Shinya Nakajima, Atsushi Kanno
Journal of Lightwave Technology 2023年12月
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Robust Dual-Wavelength DRoF Link by Quasi-2-bit 256-QAM OFDM With Delta-Sigma Modulation
Zu-Kai Weng, Pham Tien Dat, Atsushi Kanno, Kouichi Akahane, Tetsuya Kawanishi
Journal of Lightwave Technology 2023年12月
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Link Design and Control of Fixed Wireless Systems in Millimeter-Wave and Optical Converged Network 査読あり
Atsushi Kanno, Zu-Kai Weng, Tetsuya Kawanishi
2023 IEEE Conference on Antenna Measurements and Applications 2023年11月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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Antenna Effective Gain Estimation Under Windy Condition in Terahertz Fixed Wireless Systems 査読あり
Zu-Kai Weng, Keizo Inagaki, Pham Tien Dat, Atsushi Kanno, Tetsuya Kawanishi, Kouichi Akahane
2023 IEEE Conference on Antenna Measurements and Applications 2023年11月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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Design and characterization of mesoscopic dielectric cuboid antenna for operation in WR-3.4 waveguide bandwidth (220–330 GHz) 査読あり
Towa Ohno, Ayumu Yabuki, Keizo Inagaki, Atsushi Kanno, Junichi Nakajima, Norihiko Sekine, Shintaro Hisatake
Scientific Reports 13 15552 2023年09月
記述言語：英語 掲載種別：研究論文（学術雑誌）
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Carrier conversion from terahertz wave to dual-wavelength near-infrared light for photonic terahertz detection in wireless communication 査読あり
Yudai Matsumura, Yu Tokizane, Eiji Hase, Naoya Kuse, Takeo Minamikawa, Jun-ichi Fujikata, Hiroki Kishikawa, Masanobu Haraguchi, Yasuhiro Okamura, Takahiro Kaji, Akira Otomo, Isao Morohashi, Atsushi Kanno, Shintaro Hisatake, and Takeshi Yasui
Optics Express 31 ( 20 ) 33103 - 33112 2023年09月
記述言語：英語 掲載種別：研究論文（学術雑誌）
DOI： 10.1364/OE.499472
その他リンク： https://opg.optica.org/oe/fulltext.cfm?uri=oe-31-20-33103&id=538517
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Terahertz wave generated by photomixing of dual-wavelength laser lights injection-locked to a 560-GHz-spacing soliton microcomb for THz wireless communication 査読あり
Yu Tokizana, Shota Okada, Kenji Nishimoto, Hiroki Kishikawa, Yasuhiro Okamura, Naoya Kuse, Atsushi Kanno, Shintaro Hisatake, Takeshi Yasui
2023 48th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz) 2023年09月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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THz Communication System at 1.8 THz by Photonics-Based Transmitter and Electronics-based Receiver 査読あり
Isao Morohashi, Yoshihisa Irimajiri, Akira Kawakami, Tadashi Kishimoto, Pham Tien Dat, Atsushi Kanno, Norihiko Sekine, Iwao Hosako
2023 48th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz) 2023年09月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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Dual-wavelength CW lasers injection-locked to optical comb modes for carrier conversion from THz wave to near-infrared light via electro-optical polymer modulator 査読あり
Yudai Matsumura; Euji Hase, Yu Tokizane, Naoya Kuse, Takeo Minamikawa, Junichi Fujikata, Hiroki Kishikawa, Maranobu Haraguchi, Yasuhiro Okamura, Takahiro Kaji, Akira Otomo, Isao Morohashi, Atsushi Kanno, Shintaro Hisatake, Takeshi Yasui
2023 48th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz) 2023年09月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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Seamless Convergence Between Terahertz Radios and Optical Fiber Communication Toward 7G Systems 招待あり 査読あり
Atsushi Kanno
IEEE Journal of Selected Topics in Quantum Electronics 29 ( 5 ) 8600509 2023年09月
担当区分：筆頭著者, 責任著者 記述言語：英語 掲載種別：研究論文（学術雑誌）
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Demonstration of obstacle-tolerant wireless transmission at 300 GHz using Bessel beam 査読あり
Yu Katsuue, Atsushi Kanno, Norihiko Sekine, Ayumu Yabuki, Junichi Nakajima, Shintaro Hisatake
2023 XXXVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS) 2023年08月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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Phased Array of Dielectric Tapered Antenna at 300 GHz band 査読あり
Ryusei Sakai, Towa Ohno, Keizo Inagaki, Atsushi Kanno, Norihiko Sekine, Ayumu Yabuki, Junichi Nakajima, Shintaro Hisatake
2023 XXXVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS) 2023年08月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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1-Bit Reconfigurable Phase Shifter for mm-Wave Antenna Beam-Steering Applications 査読あり 国際共著
Asif Bilal, Abdul Quddious, Atsushi Kanno, Tetsuya Kawanishi, Marco A. Antoniades, Stavros Iezekiel
2023 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting (USNC-URSI) 2023年07月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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Detection of a Terahertz Wireless Signal Using Photonics-Based System with Electro-Optic Polymer Device 査読あり
Kota Miyake, Hiroki Murakami, Takahiro Kaji, Atsushi Kanno, Isao Morohashi, Akira Otomo, Hiroki Kishikawa, Takeshi Yasui, Shintaro Hisatake
2023 Photonics & Electromagnetics Research Symposium (PIERS) 2023年07月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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常温ウエハ接合によりSi上に集積された低駆動電圧型LNOI光変調器 査読あり
渡辺要, 村上誠悟, 山口祐也, 菅野敦史, 多喜川良
電気学会論文誌E（センサ・マイクロマシン部門誌） 143 ( 7 ) 202 - 203 2023年07月
記述言語：日本語 掲載種別：研究論文（学術雑誌）
その他リンク： https://www.jstage.jst.go.jp/article/ieejsmas/143/7/143_202/_article/-char/ja/
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80-Gb/s Fiber-Terahertz System in 300-GHz Band using Stable Optical Frequency Comb Generation 査読あり
Pham Tien Dat, Isao Morohashi, Norihiko Sekine, Keizo Inagaki, Atsuhi Kanno, Naoktatsu Yamamoto, Kouichi Akahane
2023 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) 2023年06月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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Terahertz-to-Optical Carrier Conversion Using Optical-Comb-Injection-Locked Dual-Wavelength Laser Light and Electro-Optic Polymer Modulator 査読あり
Yudai Matsumura, Eiji Hase, Yu Tokizane, Naoya Kuse, Jun-Ichi Fujikata, Hiroki Kishikawa, Masanobu Haraguchi, Yasuhiro Okamura, Takahiro Kaji, Akira Otomo, Atsushi Kanno, Shintaro Hisatake, Takeshi Yasui
2023 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) 2023年06月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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Advanced Optical Modulators for Sub-THz-to-Optical Signal Conversion 査読あり
Yuya Yamaguchi, Pham Tien Dat, Shingo Takano, Masayuki Motoya, Shotaro Hirata, Yu Kataoka, Junichiro Ichikawa, Ryo Shimizu, Naokatsu Yamamoto, Kouichi Akahane, Atsushi Kanno, Tetsuya Kawanishi
IEEE Journal of Selected Topics of Quantum Electroncis 29 ( 5 ) 3400108 2023年06月
記述言語：英語 掲載種別：研究論文（学術雑誌）
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Wireless Signal Transmission at the 2 and 3 THz-Band Enabled by Photonics-Based Transmitter and Hot Electron Bolometer Mixer 査読あり
Isao Morohashi, Yoshihisa Irimajiri, Akira Kawakami, Tadashi Kishimoto, Pham Tien Dat, Atsushi Kanno, Norihiko Sekine, Iwao Hosako
IEEE Journal of Selected Topics of Quantum Electronics 29 ( 5 ) 8600307 2023年06月
記述言語：英語 掲載種別：研究論文（学術雑誌）
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Temperature-independent lasing wavelength of highly stacked InAs quantum dot laser fabricated on InP(311)B substrate with Bi irradiation
Satoshi Yanase, Kouichi Akahane, Atsushi Matsumoto, Toshimasa Umezawa, Naokatsu Yamamoto, Yoriko Tominaga, Atsushi Kanno, Tomohiro Maeda, Hideyuki Sotobayashi
Optics Letters 48 ( 12 ) 3287 - 3287 2023年06月
掲載種別：研究論文（学術雑誌） 出版者・発行元：Optica Publishing Group
In this study, the effects of bismuth (Bi) irradiation on InAs quantum dot (QD) lasers operating in the telecommunication wavelength band were investigated. Highly stacked InAs QDs were grown on an InP(311)B substrate under Bi irradiation, and a broad-area laser was fabricated. In the lasing operation, the threshold currents were almost the same, regardless of Bi irradiation at room temperature. These QD lasers were operated at temperatures between 20 and 75°C, indicating the possibility of high-temperature operation. In addition, the temperature dependence of the oscillation wavelength changed from 0.531 nm/K to 0.168 nm/K using Bi in the temperature range 20–75°C.
DOI： 10.1364/ol.493223
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Terahertz wireless communication in a 560-GHz band using a Kerr micro-resonator soliton comb 査読あり
Yu Tokizane, Shota Okada, Kenji Nishimoto, Yasuhiro Okamura, Hiroki Kishikawa, Takeo Minamikawa, Eiji Hase, Jun-ichi Fujikata, Masanobu Haraguchi, Atsushi Kanno, Shintaro Hisatake, Naoya Kuse, Takeshi Yasui
Optics Continuum 2 ( 5 ) 1267 - 1275 2023年05月
記述言語：英語 掲載種別：研究論文（学術雑誌）
その他リンク： https://opg.optica.org/optcon/fulltext.cfm?uri=optcon-2-5-1267&id=530656
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40-GHz resonant-cavity 2-D photodetector array using InP/InGaAs DH structure for advanced optical wireless communications 査読あり
Toshimasa Umezawa, Atsushi Matsumoto, Kouich Akahane, Atsushi Kanno, Naokatsu Yamamoto
2023 Conference on Lasers and Electro-Optics (CLEO) 2023年05月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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Simple and High-Speed Fiber–Terahertz–Fiber Bridge System in 355-GHz Band using Photonics-Enabled Receiver 査読あり
Pham Tien Dat, Isao Morohashi, Keizo Inagaki, Norihiko Sekine, Atsuhi Kanno, Naoktatsu Yamamoto, Kouichi Akahane
2023 Conference on Lasers and Electro-Optics (CLEO) 2023年05月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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Carrier Conversion from 100-GHz THz Wave to Dual-Wavelength Optical Carrier Injection-Locked to Optical Comb Modes Using Electro-Optical Polymer Modulator for Photonic THz Detection 査読あり
Yuta Matsumura, Eiji Hase, Yu Tokizane, Junichi Fujikata, Hiroshi Kishikawa, Masanobu Haraguchi, Yasuhiro Okamura, Takahiro Kaji, Akira Otomo, Atsushi Kanno, Shintaro Hisatake, Naoya Kuse, Takeshi Yasui
2023 Conference on Lasers and Electro-Optics (CLEO) 2023年05月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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Traveling-Wave Mach-Zehnder Modulator Integrated With Electro-Optic Frequency-Domain Equalizer for Broadband Modulation 査読あり
Yuya Yamaguchi, Pham Tien Dat, Shingo Takano, Masayuki Motoya, Shotaro Hirata, Yu Kataoka, Junichiro Ichikawa, Satoshi Oikawa, Ryo Shimizu, Naokatsu Yamamoto, Kouichi Akahane, Atsushi Kanno, Tetsuya Kawanishi
Journal of Lightwave Technology 41 ( 12 ) 3883 - 3891 2023年04月
記述言語：英語 掲載種別：研究論文（学術雑誌）
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Resonant Cavity 4-λ Integrated 4×4 PD-Array for High Optical Alignment Robustness WDM-FSO Communications 査読あり
Toshimasa Umezawa, Shoichi Takamizawa, Atsushi Matsumoto, Kouichi Akahane, Naokatsu Yamamoto, Atsushi Kanno, Tetsuya Kawanishi
Journal of Lightwave Technology 41 ( 8 ) 2645 - 2473 2023年04月
記述言語：英語 掲載種別：研究論文（学術雑誌）
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Terahertz Propagation Modeling for Office and Corridor Environments 査読あり
Hirokazu Sawada, Takeshi Matsumura, Keizo Inagaki, Atsushi Kanno, Katsumi Fujii, Jerdvisanop Chakarothai, Norihiko Sekine, Akifumi Kasamatsu, Hiroyo Ogawa
2023 17th European Conference on Antennas and Propagation (EuCAP) 2023年03月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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Fixed-Length Arbitrary-Phase Tunable NRI-TL Metamaterial Phase Shifter for Antenna Beam-Steering Applications 査読あり 国際共著
Asif Bilal, Abdul Quddious, Atsushi Kanno, Tetsuya Kawanishi, Marco A. Antoniades, Stavros Iezekiel
2023 17th European Conference on Antennas and Propagation (EuCAP) 2023年03月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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Demonstration of Wireless Transmission of QPSK Signals at 2 THz 査読あり
Isao Morohashi, Yoshihisa Irimajiri, Akira Kawakami, Tadashi Kishimoto, Pham Tien Dat, Atsuhi Kanno, Norihiko Sekine, Iwao Hosako
2023 Optical Fiber Communications Conference and Exhibition (OFC) 2023年03月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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DSP-enhanced Radio-over-fiber Xhaul Networks Toward Beyond-5G 招待あり 査読あり
Paikun Zhu, Yuki Yoshida, Atsushi Kanno, Kouichi Akahane, Ken-Ichi Kitayama
2023 Optical Fiber Communications Conference and Exhibition (OFC) 2023年03月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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Dispersion Compensation over C-band WDM Grid for 100Gb/s PAM4 System by Low-complexity Optoelectronic Feedforward Equalization (OE-FFE) 査読あり
Paikun Zhu, Yuki Yoshida, Atsushi Kanno, Kouichi Akahane, Ken-Ichi Kitayama
2023 Optical Fiber Communications Conference and Exhibition (OFC) 2023年03月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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100-Gbps 2-SDM 2-WDM FSO beam direct detection using resonant cavity 4x4 photodetector array 査読あり
Toshimasa Umezawa, Atsushi Matsumoto, Kouichi Akahane, Atsushi Kanno, Naokatsu Yamamoto
2023 Optical Fiber Communications Conference and Exhibition (OFC) 2023年03月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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Delay Compensated Quad-level Delta-sigma Modulation Dual-color DRoF System for Beyond 5G Mobile Fronthaul 査読あり
Zu-Kai Weng, Pham Tien Dat, Atsushi Kanno, Tetsuya Kawanishi, Kouichi Akahane
2023 Optical Fiber Communications Conference and Exhibition (OFC) 2023年03月
記述言語：英語 掲載種別：研究論文（学術雑誌）
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Gbps-Class Solar-Blind WDM Optical Wireless Communication By (264, 274, 282)-nm Deep-UV LEDs and CsTe Photomultiplier Tube 査読あり
Yuki Yoshida, Kazunobu Kojima, Masaki Shiraiwa, Atsushi Kanno, Akira Hirano, Yosuke Nagasawa, Masamichi Ippommatsu, Naokatsu Yamamoto, Shigefusa F. Chichibu, Yoshinari Awaji
2023 Optical Fiber Communications Conference and Exhibition (OFC) 2023年03月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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Transparent Radio–Fiber–Radio–Fiber System in 100-GHz Band for Indoor Uplink Signal Transmission in Beyond 5G 査読あり
2023年03月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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Transparent Relay and Switching of THz-wave Signals in 285-GHz Band Using Photonic Technology
Pham Tien Dat, Yuya Yamaguchi, Keizo Inagaki, Shingo Takano, Shotaro Hirata, Junichiro Ichikawa, Ryo Shimizu, Isao Morohashi, Yuki Yoshida, Atsushi Kanno, Naokatsu Yamamoto, Tetsuya Kawanishi, Kouichi Akahane
2023 Optical Fiber Communications Conference and Exhibition (OFC) 2023年03月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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Millimeter Wave Attenuation Due to Wind and Heavy Rain in a Tropical Region 査読あり 国際共著
Ukrit Mankong, Pakawat Chamsuk, Sitthichok Nakprasert, Sangdaun Potha, Zu-Kai Weng, Pham Tien Dat, Atsushi Kanno, Tetsuya Kawanishi
Sensors 23 ( 5 ) 2532 2023年02月
記述言語：英語 掲載種別：研究論文（学術雑誌）
DOI： 10.3390/s23052532
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94.5 GHz Dual-loop Optoelectronic Oscillator 国際共著
G. K. M. Hasanuzzaman, Stavros Iezekiel, Atsushi Kanno
2023 International Conference on Electrical, Computer and Communication Engineering (ECCE) 2023年02月
担当区分：最終著者 記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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Analysis and Demonstration of Low-Complexity Joint Optical-Electrical Feedforward Equalization (OE-FFE) For Dispersion-Limited High-Speed IM/DD Transmission
Paikun Zhu, Yuki Yoshida, Atsushi Kanno, Ken-ichi Kitayama
Journal of Lightwave Technology 41 ( 2 ) 477 - 488 2023年01月
記述言語：英語 掲載種別：研究論文（学術雑誌）
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Single-pixel optical modulation analyzer based on phase retrieval for dual-polarization IQ modulators 査読あり
Yuki Yoshida, Setsuo Yoshida, Shoichiro Oda, Takeshi Hoshida, Naokatsu Yamamoto, Atsushi Kanno
Optics Express 31 ( 1 ) 659 - 672 2023年01月
担当区分：最終著者 記述言語：英語 掲載種別：研究論文（学術雑誌）
DOI： 10.1364/OE.475841
その他リンク： https://opg.optica.org/oe/fulltext.cfm?uri=oe-31-1-659&id=524560
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Delay Compensated Quad-level Delta-sigma Modulation Dual-color DRoF System for Beyond 5G Mobile Fronthaul.
Zu-Kai Weng, Pham Tien Dat, Atsushi Kanno, Tetsuya Kawanishi, Kouichi Akahane
Optical Fiber Communications Conference and Exhibition(OFC) 1 - 3 2023年
掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
DOI： 10.23919/OFC49934.2023.10117066
その他リンク： https://dblp.uni-trier.de/db/conf/ofc/ofc2023.html#WengDKKA23
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Transparent Radio-Fiber-Radio-Fiber System in 100-GHz Band for Indoor Uplink Signal Transmission in Beyond 5G.
Pham Tien Dat, Yuya Yamaguchi, Atsushi Kanno, Naokatsu Yamamoto, Tetsuya Kawanishi, Kouichi Akahane
Optical Fiber Communications Conference and Exhibition(OFC) 1 - 3 2023年
掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
DOI： 10.23919/OFC49934.2023.10116538
その他リンク： https://dblp.uni-trier.de/db/conf/ofc/ofc2023.html#DatYKYKA23
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Transparent Relay and Switching of THz-wave Signals in 285-GHz Band Using Photonic Technology.
Pham Tien Dat, Yuya Yamaguchi, Keizo Inagaki, Shingo Takano, Shotaro Hirata, Junichiro Ichikawa, Ryo Shimizu, Isao Morohashi, Yuki Yoshida, Atsushi Kanno, Naokatsu Yamamoto, Tetsuya Kawanishi, Kouichi Akahane
Optical Fiber Communications Conference and Exhibition(OFC) 1 - 3 2023年
掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
DOI： 10.23919/OFC49934.2023.10116707
その他リンク： https://dblp.uni-trier.de/db/conf/ofc/ofc2023.html#DatYITHISMYKYKA23
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Surfactant effect of Bi on InAs quantum dot laser diode
Satoshi Yanase, Kouichi Akahane, Atsushi Matsumoto, Naokatsu Yamamoto, Atsushi Kanno, Tomohiro Maeda, Hideyuki Sotobayashi
Japanese Journal of Applied Physics 2022年12月
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Performance Comparison of Photonic Downconversion for Uplink Mobile Fronthaul
Pham Tien Dat, Yuya Yamaguchi, Atsushi Kanno
IEEE Photonics Technology Letters 34 ( 17 ) 923 - 926 2022年09月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Institute of Electrical and Electronics Engineers ({IEEE})
This study compares the performance of photonic downconversion technology using single and dual wavelength modulation methods using an optical phase modulator. We compared the system characteristics, including the conversion gain, phase noise, and spurious-free dynamic range, of the two approaches. To demonstrate the proof-of-concept, we transmitted high-order quadrature amplitude modulation orthogonal frequency-division multiplexing signals in the 43 and 52 GHz bands over the system. The results confirm the potential of the system as a promising solution for uplink mobile fronthaul in high-frequency bands, such as in 5G-Advanced networks.
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Mach-Zehnder Optical Modulator Integrated with Tunable Multimode Interference Coupler of Ti:LiNbO<inf>3</inf>Waveguides for Controlling Modulation Extinction Ratio 査読あり
Anna Hirai, Yuichi Matsumoto, Takanori Sato, Tadashi Kawai, Akira Enokihara, Shinya Nakajima, Atsushi Kanno, Naokatsu Yamamoto
IEICE Transactions on Electronics E105.C ( 8 ) 385 - 388 2022年08月
記述言語：英語 掲載種別：研究論文（学術雑誌）
A Mach-Zehnder optical modulator with the tunable multimode interference coupler was fabricated using Ti-diffused LiNbO3. The modulation extinction ratio could be voltage controlled to maximize up to 50 dB by tuning the coupler. Optical single-sideband modulation was also achieved with a sideband suppression ratio of more than 30 dB.
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Multichannel random signal generation in optical fiber-based ring laser with quantum-dot semiconductor optical amplifier
Kouichi Akahane, Atsushi Matsumoto, Toshimasa Umezawa, Naokatsu Yamamoto, Yuki Yata, Hideyuki Sotobayashi, Makoto Naruse, Atsushi Kanno
Japanese Journal of Applied Physics 61 ( SC ) SC1055 - SC1055 2022年05月
掲載種別：研究論文（学術雑誌） 出版者・発行元：IOP Publishing
Abstract
Random signal generation in a ring resonator laser is achieved with quantum-dot semiconductor optical amplifiers. The lasing spectra were obtained over a wide range of wavelengths, and the individual longitudinal modes acted as the channels for random number generation.DOI： 10.35848/1347-4065/ac4a02
その他リンク： https://iopscience.iop.org/article/10.35848/1347-4065/ac4a02/pdf
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High-speed solar-blind optical wireless communication enabled by DUV LED
Yuki Yoshida, Kazunobu Kojima, Masaki Shiraiwa, Atsushi Kanno, Akira Hirano, Yosuke Nagasawa, Masamichi Ippommatsu, Naokatsu Yamamoto, Shigefusa F. Chichibu, Yoshinari Awaji
Light-Emitting Devices, Materials, and Applications XXVI 2022年03月
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Transparent Fiber-Millimeter-Wave-Fiber System in 100-GHz Band Using Optical Modulator and Photonic Down-Conversion
Dat, P.T., Yamaguchi, Y., Motoya, M., Oikawa, S., Ichikawa, J., Kanno, A., Yamamoto, N., Kawanishi, T.
Journal of Lightwave Technology 40 ( 5 ) 1483 - 1493 2022年
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Institute of Electrical and Electronics Engineers ({IEEE})
We demonstrate the first fiber-millimeter-wave-fiber system in the 100-GHz band using a low-loss optical modulator and direct photonic down-conversion technology. The utilization of a low-loss optical modulator for the direct conversion of a millimeter-wave signal to an optical signal significantly simplifies the millimeter-wave radio receiver because it includes only a radio front-end and an optical modulator. In addition, by adopting direct photonic down-conversion technology for simultaneous detection and down-conversion of the millimeter-wave signal to the microwave band, the fiber-radio receiver and subsequent digital signal processing can be considerably simplified. Using the proposed technologies, we successfully transmitted 32-/64-quadrature amplitude modulation orthogonal frequency division multiplexing and single-carrier signal with a line rate of 71.4 Gb/s and a net data rate of 53.7 Gb/s over a wired and wireless converged system consisting of two optical fiber links and a 20 m radio link at 101 GHz. The proposed system is promising for high-capacity, low-latency, and low-power consumption fiber-wireless transmission in beyond 5G networks.
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Laser Characteristic and Strain Distribution Dependence on Embedding Layer Thickness of Quantum Dots Laser Diodes Grown on InP(311)B Substrate
Matsumoto, A., Akahane, K., Umezawa, T., Nakajima, S., Yamamoto, N., Kanno, A.
Physica Status Solidi (A) Applications and Materials Science 219 ( 4 ) 2022年
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High-speed fiber-wireless-fiber system in the 100-GHz band using a photonics-enabled receiver and optical phase modulator
Dat, P.T., Umezawa, T., Kanno, A., Yamamoto, N., Kawanishi, T.
Optics Letters 47 ( 5 ) 2022年
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DSP-enhanced radio-over-fiber technologies for 5G-and-beyond wired-wireless convergence
Zhu, P., Yoshida, Y., Kanno, A., Kitayama, K.-I.
Journal of Optical Communications and Networking 14 ( 8 ) 2022年
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Analysis and Demonstration of Low-complexity Joint Optical-electrical Feedforward Equalization (OE-FFE) for Dispersion-limited High-speed IM/DD Transmission
Paikun Zhu, Yuki Yoshida, Atsushi Kanno, Ken-ichi Kitayama
Journal of Lightwave Technology 2022年
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Low-Loss Ti-diffused LiNbO3 Modulator Integrated with Electro-Optic Frequency-Domain Equalizer for High Bandwidth Exceeding 110 GHz
Yuya Yamaguchi, Pham Tien Dat, Shingo Takano, Masayuki Motoya, Yu Kataoka, Junichiro Ichikawa, Satoshi Oikawa, Ryo Shimizu, Naokatsu Yamamoto, Atsushi Kanno, Tetsuya Kawanishi
2022 EUROPEAN CONFERENCE ON OPTICAL COMMUNICATION (ECOC) 2022年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
We propose and demonstrate a low-loss and high-bandwidth lithium niobate modulator integrated with an electro-optic frequency-domain equalizer. The fabricated Ti-diffused lithium niobate modulator has a low optical loss of 5.4 dB, low half-wave voltage of 3.7 V, and high bandwidth exceeding 110 GHz. (C) 2022 The Author(s)
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Widely Nonlinear Phase Retrieval for Direct Detection-based Digital Twinning of Coherent Optical Components
Yuki Yoshida, Setsuo Yoshida, Shoichiro Oda, Yuya Yamaguchi, Naokatsu Yamamoto, Takeshi Hoshida, Atsushi Kanno
2022 EUROPEAN CONFERENCE ON OPTICAL COMMUNICATION (ECOC) 2022年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
A complex-valued Volterra system identification method via phase retrieval is proposed as an affordable monitoring solution for generating and maintaining the dynamic true-to-life simulation model, namely digital twin, of a coherent optical component. The feasibility of the proposed digital twinning method is demonstrated numerically. (C) 2022 The Author(s)
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Transparent Delivery of 100-GHz Radio Signal to Indoor Using Broadband Phase-Modulated Ro System
Pham Tien Dat, Yuya Yamaguchi, Keizo Inagaki, Naokatsu Yamamoto, Atsushi Kanno
2022 EUROPEAN CONFERENCE ON OPTICAL COMMUNICATION (ECOC) 2022年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
We demonstrate a broadband RoF system for transparent delivery of 100-GHz radio signal from outdoor to indoor using a low-loss optical phase modulator. We successfully transmitted 32-/64-QAM OFDM with a line rate of approximately 29 Gb/s over the converged system consisting of two RoF links and two radio links in the 100-GHz band. (C) 2022 The Author(s)
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50 GHz High Photocurrent PIN-PD and Its Thermal Effect.
Yaofeng Yi, Toshimasa Umezawa, Atsushi Kanno, Tetsuya Kawanishi
2022 27th OptoElectronics and Communications Conference (OECC) and 2022 International Conference on Photonics in Switching and Computing (PSC)(OECC/PSC) 1 - 3 2022年
掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
DOI： 10.23919/OECC/PSC53152.2022.9849985
その他リンク： https://dblp.uni-trier.de/db/conf/ps/psc2022.html#YiUKK22
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High-Efficient Pixel Layout Arrangement in High-Speed 2-D Photodetector Array.
Siyang Duan, Toshimasa Umezawa, Atsushi Kanno, Tetsuya Kawanishi
2022 27th OptoElectronics and Communications Conference (OECC) and 2022 International Conference on Photonics in Switching and Computing (PSC)(OECC/PSC) 1 - 3 2022年
掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
DOI： 10.23919/OECC/PSC53152.2022.9849879
その他リンク： https://dblp.uni-trier.de/db/conf/ps/psc2022.html#DuanUKK22
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High-Speed Beam Steering LN Optical Phased Array Module using Comb-Electrode.
Hayato Takemura, Haruto Shinya, Yuya Yamaguchi, Toshimasa Umezawa, Atsushi Kanno, Tetsuya Kawanishi
2022 27th OptoElectronics and Communications Conference (OECC) and 2022 International Conference on Photonics in Switching and Computing (PSC)(OECC/PSC) 1 - 3 2022年
掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
DOI： 10.23919/OECC/PSC53152.2022.9849875
その他リンク： https://dblp.uni-trier.de/db/conf/ps/psc2022.html#TakemuraSYUKK22
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Millimeter-wave signal generation and its radio-over-fiber link transmission based on optical SSB modulation in 105-GHz band
Kohei Fujiwara, Kouichi Tokita, Atsushi Kanno
2021 34th General Assembly and Scientific Symposium of the International Union of Radio Science, URSI GASS 2021 2021年08月
掲載種別：研究論文（国際会議プロシーディングス）
The development of a system facilitating the convergence of millimeter-wave and optical systems is highly desirable to realize 5G/beyond 5G mobile communication. However, such broad-bandwidth signals cannot be easily transmitted using a long optical fiber owing to the optical fiber chromatic dispersion effect. This paper reports upon the realization of a high-speed millimeter-wave radio-over-fiber signal transmission by using an optical single-sideband (SSB) modulation scheme. The combination of an optical intensity modulator and optical filter can provide the optical SSB signals with an automatic bias controller. The IEEE802.11ad-compliant packet streams are successfully transmitted and converted into 105 GHz millimeter-wave signals. The system can generate and transmit a packet in 16-QAM under an error vector magnitude of 4.8% at a frequency of 104.77 GHz.
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Millimeter-wave radio-over-fiber system using optical phase modulation and photonic downconversion for uplink fronthaul transmission
Pham Tien Dat, Yuya Yamaguchi, Atsushi Kanno, Masayuki Motoya, Satoshi Oikawa, Junichiro Ichikawa, Naokatsu Yamamoto
OPTICS LETTERS 46 ( 10 ) 2493 - 2496 2021年05月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：OPTICAL SOC AMER
This Letter proposes a high-performance radio-over-fiber (RoF) system for high-speed and high-fidelity analog waveform transmission of radio signals in the millimeter-wave band in the uplink direction. At the antenna site, the system utilizes a newly fabricated low half-wave voltage broadband phase modulator to convert a millimeter-wave radio signal into an optical signal. At the receiver, by using photonic downconversion and optical filtering technology, a simple direct detection and downconversion of the signal to the microwave band can be achieved simultaneously. As a demonstration of proof of concept, we successfully transmitted a 1024-quadrature amplitude modulation (QAM ) narrowband orthogonal frequency-division multiplexing signal at 38 GHz and a 60 Gb/s 64-QAM single-carrier signal at 26.5 GHz over a 20 km RoF system. The system is promising for facilitating the deployment of ultra-dense small cells in high-frequency bands in 5G and beyond networks. (C) 2021 Optical Society of America
DOI： 10.1364/OL.425267
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Superconducting acousto-optic phase modulator 査読あり
Ayato Okada, Rekishu Yamazaki, Maria Fuwa, Atsushi Noguchi, Yuya Yamaguchi, Atsushi Kanno, Naokatsu Yamamoto, Yuji Hishida, Hirotaka Terai, Yutaka Tabuchi, Koji Usami, Yasunobu Nakamura
OPTICS EXPRESS 29 ( 9 ) 14151 - 14162 2021年04月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：OPTICAL SOC AMER
We report the development of a superconducting acousto-optic phase modulator fabricated on a lithium niobate substrate. A titanium-diffused optical waveguide is placed in a surface acoustic wave resonator, where the electrodes for mirrors and an interdigitated transducer are made of a superconducting niobium titanium nitride thin film. The device performance is evaluated as a substitute for the current electro-optic modulators, with the same fiber coupling scheme and comparable device size. Operating the device at a cryogenic temperature (T = 8 K), we observe the length-half-wave-voltage (length-V-pi) product of 1.78 V.cm. Numerical simulation is conducted to reproduce and extrapolate the performance of the device. An optical cavity with mirror coating on the input/output facets of the optical waveguide is tested for further enhancement of the modulation efficiency. A simple extension of the current device is estimated to achieve an efficient modulation with V-pi = 0.27 V. (C) 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
DOI： 10.1364/OE.426371
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3 3 MIMO FiberWireless System in W-Band with WDM/PDM RoF Transmission Capability
Dat, P.T., Kanno, A., Rottenberg, F., Yamamoto, N., Kawanishi, T.
Journal of Lightwave Technology 39 ( 24 ) 7794 - 7803 2021年
掲載種別：研究論文（学術雑誌） 出版者・発行元：Institute of Electrical and Electronics Engineers ({IEEE})
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Seamless Fiber-Wireless System in W-Band Using Optical Phase Modulation and Self-Homodyne Receiver
Dat, P.T., Umezawa, T., Kanno, A., Yamamoto, N., Kawanishi, T.
IEEE Photonics Technology Letters 33 ( 20 ) 1159 - 1162 2021年
掲載種別：研究論文（学術雑誌） 出版者・発行元：Institute of Electrical and Electronics Engineers ({IEEE})
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Millimeter-Wave and Terahertz Fixed Wireless Link Budget Evaluation for Extreme Weather Conditions
Zu-Kai Weng, Atsushi Kanno, Pham Tien Dat, Keizo Inagaki, Kosuke Tanabe, Eisaku Sasaki, Thomas Kurner, Bo Kum Jung, Tetsuya Kawanishi
IEEE Access 9 163476 - 163491 2021年
掲載種別：研究論文（学術雑誌） 出版者・発行元：Institute of Electrical and Electronics Engineers ({IEEE})
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High-stability, high-signal-quality radio-over-fiber system for IEEE802.11ad packet transmission based on optical single-sideband modulation in W-band
Fujiwara, K., Kanno, A., Tokita, K.
IEICE Electronics Express 18 ( 4 ) 2021年
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High-fidelity indoor MIMO radio access for 5G and beyond based on legacy multimode fiber and real-time analog-to-digital-compression
Zhu, P., Yoshida, Y., Kanno, A., Yamamoto, N., Kitayama, K.-I.
Optics Express 29 ( 2 ) 2021年
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FSO Receiver with High Optical Alignment Robustness Using High-Speed 2D-PDA and Space Diversity Technique
Umezawa, T., Yoshida, Y., Kanno, A., Matsumoto, A., Akahane, K., Yamamoto, N., Kawanishi, T.
Journal of Lightwave Technology 39 ( 4 ) 1040 - 1047 2021年
掲載種別：研究論文（学術雑誌） 出版者・発行元：Institute of Electrical and Electronics Engineers ({IEEE})
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Transparent Fiber-Radio-Fiber Bridge at 101 GHz using Optical Modulator and Direct Photonic Down-Conversion
Pham Tien Dat, Yuya Yamaguchi, Keizo Inagaki, Masayuki Motoya, Satoshi Oikawa, Junichiro Ichikawa, Atsushi Kanno, Naokatsu Yamamoto, Tetsuya Kawanishi
2021 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXPOSITION (OFC) 2021年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
We demonstrate the first fiber-radio-fiber system in beyond 90 GHz using low loss optical modulator and direct photonic down-conversion. We successfully transmitted 32-/64-QAM OFDM and single-carrier signal with a record line rate of 71.4 Gb/s and net data rate of 53.7 Gb/s.
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1024-QAM Analog Waveform Transmission Over a Seamless Fiber-Wireless System in W Band.
Pham Tien Dat, Atsushi Kanno, Naokatsu Yamamoto, Tetsuya Kawanishi
2021 IEEE Conference on Computer Communications Workshops 1 - 2 2021年
掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
DOI： 10.1109/INFOCOMWKSHPS51825.2021.9484620
その他リンク： https://dblp.uni-trier.de/db/conf/infocom/infocom2021w.html#DatKYK21
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Demonstration of 28-GHz Band Radio Signal Transmission into Vehicle by Analog Radio over Multi-Mode Fiber.
Hiroki Yasuda, Toshinori Suzuki, Hsuan-Yun Kao, Satoshi Tanaka, Shota Ishimura, Kazuki Tanaka, Naokatsu Yamamoto, Atsushi Kanno, Ryo Inohara, Kosuke Nishimura, Takamitsu Aiba, Tomohiro Wakabayashi, Tetsuya Kawanishi
Optical Fiber Communications Conference and Exhibition(OFC) 1 - 3 2021年
掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
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A Preliminary Study on Feasibility Radar Cross-Section of Foreign Object Debris for Size Classification
Ja?afar, P.N., Idrus, S.M., Ambran, S., Hamzah, A., Zulkifli, N., Hamid, N.A., Kanno, A., Shibagaki, N., Kashima, K., Kawanishi, T.
International Journal of Nanoelectronics and Materials 14 ( Special Issue InCAPE ) 2021年
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Single-pixel optical modulation analyzer: A low-complexity frequency-dependent IQ imbalance monitor based on direct detection with phase retrieval
Yoshida, Y., Yoshida, S., Oda, S., Hoshida, T., Yamamoto, N., Kanno, A.
Optics Express 29 ( 20 ) 2021年
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Terahertz and Photonics Seamless Short-Distance Links for Future Mobile Networks
Kawanishi, T., Inagaki, K., Kanno, A., Yamamoto, N., Aiba, T., Yasuda, H., Wakabayashi, T.
Radio Science 56 ( 2 ) 2021年
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Demonstration of Indoor 5G Fronthaul over Legacy Multimode Fiber Enabled by Real-time Analog-to-digital Compression (ADX)
Paikun Zhu, Yuki Yoshida, Atsushi Kanno, Naokatsu Yamamoto, Ken-Ichi Kitayama
2020 European Conference on Optical Communications, ECOC 2020 2020年12月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：Institute of Electrical and Electronics Engineers Inc.
An analog-to-digital-compression radio-over-multimode-fiber (ADX-RoMMF) scheme is proposed and experimentally demonstrated for high-fidelity, cost-effective indoor 5G-and-beyond access. Real-time fronthauling of 16-channel MIMO, 5G NR-bandwidth 1024QAM signals verify more than 4-fold MMF reach extension compared with conventional scheme, while maintaining 500ns one-way ADX latency.
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Up-to 292-Mbps Deep-UV Communication over a Diffuse-Line-of-Sight Link Based on Silicon Photo Multiplier Array
Yuki Yoshida, Kazunobu Kojima, Masaki Shiraiwa, Atsushi Kanno, Akira Hirano, Yosuke Nagasawa, Masamichi Ippommatsu, Naokatsu Yamamoto, Shigefusa F. Chichibu, Yoshinari Awaji
2020 European Conference on Optical Communications (ECOC) 2020年12月
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Fiber wireless and optical wireless communications using high-speed photonic devices
Toshimasa Umezawa, Pham Tien Dat, Atsushi Kanno, Naokatsu Yamamoto
International Conference on Advanced Technologies for Communications 2020- 1 - 4 2020年10月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE Computer Society
High data rates and low latencies will be indispensable in next generation communication devices. In order to achieve these targets, the use of wireless communication technology combined with photonics and optics is expected to have significant potential. In this paper, we present a key device for advanced fiber wireless and optical wireless communications. A new device integrated with a 100 GHz uni-travelling carrier photodetector and a 100 GHz pHEMT amplifier is introduced for high data rate fiber wireless communication applications operating at data rates above 20 Gbps. For optical wireless communication applications, another novel two-dimensional photodetector array (2D-PDA) device is introduced, and demonstrated for 100 Gbps high data rate communications using the wavelength division multiplexing (WDM) technology in free-space.
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Orchestration of wired and wireless systems for future mobile transport network
Pham Tien Dat, Atsushi Kanno, Naokatsu Yamamoto, Tetsuya Kawanishi
International Conference on Advanced Technologies for Communications 2020- 70 - 73 2020年10月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE Computer Society
In this paper, we present high-speed, low latency, and flexible transport systems for 5G and beyond networks using an orchestration of different transmission mediums, including fiber-optic, free-space optics (FSO), and millimeter-wave (MMW). We introduce the system concepts and review our recent proof-of-concept demonstration results for each system. We also present a hybrid FSO and MMW system for highly resilient and reliable mobile transport in ultra-dense small cell networks.
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Variable-linewidth light source based on Brownian motion random walk in optical phase
Jun Mochizuki, Keizo Inagaki, Guo-Wei Lu, Takahide Sakamoto, Yuki Yoshida, Atsushi Kanno, Naokatsu Yamamoto, Tetsuya Kawanishi
IEICE ELECTRONICS EXPRESS 17 ( 16 ) 2020年08月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG
We proposed a variable linewidth light source using random walk phase noise. As a demonstration, the impact of the laser linewidth on the error-vector magnitude performance in the optical QPSK transmission was evaluated by using the proposed laser source experimentally, where the linewidth tunable range was from 40 kHz to 5 MHz.
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Self-organized micro-light-emitting diode structure for high-speed solar-blind optical wireless communications 査読あり
K. Kojima, Y. Yoshida, M. Shiraiwa, Y. Awaji, A. Kanno, N. Yamamoto, A. Hirano, Y. Nagasawa, M. Ippommatsu, S. F. Chichibu
Applied Physics Letters 117 ( 3 ) 031103 - 031103 2020年07月
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Characterization of a Self-Organized Deep-Ultraviolet Micro-Light-Emitting Diode Structure for High-Speed Solar-Blind Optical Wireless Communications
Kazunobu Kojima, Yuki Yoshida, Masaki Shiraiwa, Yoshinari Awaji, Atsushi Kanno, Naokatsu Yamamoto, Akira Hirano, Yosuke Nagasawa, Masamichi Ippommatsu, Shigefusa F. Chichibu
Conference Proceedings - Lasers and Electro-Optics Society Annual Meeting-LEOS 2020- 2020年05月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：Institute of Electrical and Electronics Engineers Inc.
Time-and spatio-resolved electroluminescence spectroscopy was performed to characterize a self-organized micro-structure in the AlGaN LEDs, which have realized gigabit-class solar-blind optical wireless communication.
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High-Speed Radio-on-Free-Space Optical Mobile Fronthaul System for Ultra-Dense Radio Access Network
Pham Tien Dat, Atsushi Kanno, Keizo Inagaki, Francois Rottenberg, Jerome Louveaux, Naokatsu Yamamoto, Tetsuya Kawanishi
2020 Optical Fiber Communications Conference and Exhibition, OFC 2020 - Proceedings 2020年03月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：Institute of Electrical and Electronics Engineers Inc.
We present a transmission of radio signals in high-frequency band over a seamless fiber-FSO system for ultra-dense radio access network. We successfully transmitted 80-Gb/s and 40-Gb/s 2×2 MIMO FBMC-OQAM signal in the 90-GHz band over the DL and UL direction.
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A Phase-Retrieving Coherent Receiver Based on Two-Dimensional Photodetector Array
Yuki Yoshida, Toshimasa Umezawa, Atsushi Kanno, Naokatsu Yamamoto
Journal of Lightwave Technology 38 ( 1 ) 90 - 100 2020年01月
掲載種別：研究論文（学術雑誌） 出版者・発行元：Institute of Electrical and Electronics Engineers ({IEEE})
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High-Speed Railway Communication System Using Linear-Cell-Based Radio-Over-Fiber Network and Its Field Trial in 90-GHz Bands
Atsushi Kanno, Pham Tien Dat, Naokatsu Yamamoto, Tetsuya Kawanishi, Nagateru Iwasawa, Nariya Iwaki, Kazuki Nakamura, Kunihiro Kawasaki, Naoki Kanada, Naruto Yonemoto, Yosuke Sato, Masato Fujii, Katsuya Yanatori, Nobuhiko Shibagaki, Kenichi Kashima
JOURNAL OF LIGHTWAVE TECHNOLOGY 38 ( 1 ) 112 - 122 2020年01月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
A linear-cell-based radio-over-fiber (LC-RoF) system is proposed and demonstrated for efficient mobile communication in high-speed trains without hard handover processes. The configuration of the LC-RoF network and possible router architectures are discussed for the field trial test of the proposed system and for advanced systems in the future. Via the LC-RoF network, 90-GHz, millimeter-wave radio access between the ground and a train car is operated in a centralized manner. The resulting throughput of 1.5 Gbit/s is achieved in the field trial test, which is comprised of 250-Mbaud four-subcarrier differential quadrature phase-shift keying with a forward-error correction code implemented in field-programmable gate arrays to the Shinkansen train traveling at 240 km/h without any interruptions in the connections at the change of radio access units.
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Integrated Optical Intensity Modulator with Analog Waveform-Shaping Function for PAM-4 Signal
Yuya Yamaguchi, Atsushi Kanno, Naokatsu Yamamoto, Tetsuya Kawanishi
2020 INTERNATIONAL TOPICAL MEETING ON MICROWAVE PHOTONICS (MWP 2020) 98 - 100 2020年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
We devised an optical intensity modulator whose transfer function is an approximate four-level step function. The method employed to generate the required transfer function in the intensity domain is described, and the designed response is experimentally demonstrated using the fabricated modulator.
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132 Gb/s 3×3 Full MIMO Fiber-Wireless Seamless System in W Band Using WDM/PDM RoF Transmission.
Pham Tien Dat, François Rottenberg, Atsushi Kanno, Keizo Inagaki, Jérôme Louveaux, Naokatsu Yamamoto, Tetsuya Kawanishi
European Conference on Optical Communications(ECOC) 1 - 4 2020年
掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
DOI： 10.1109/ECOC48923.2020.9333373
その他リンク： https://dblp.uni-trier.de/db/conf/ecoc/ecoc2020.html#DatRKILYK20
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A Phase-Retrieving Coherent Receiver Based on Two-Dimensional Photodetector Array
Yoshida, Y., Umezawa, T., Kanno, A., Yamamoto, N.
Journal of Lightwave Technology 38 ( 1 ) 2020年
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30 GHz Radio over FSO System using High Speed 2D-PDA and Its Optical Path Switching Performance.
Toshimasa Umezawa, Pham Tien Dat, Atsushi Kanno, Kunihisa Jitsuno, Naokatsu Yamamoto, Tetsuya Kawanishi
European Conference on Optical Communications(ECOC) 1 - 4 2020年
掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
DOI： 10.1109/ECOC48923.2020.9333416
その他リンク： https://dblp.uni-trier.de/db/conf/ecoc/ecoc2020.html#UmezawaDKJYK20
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FMCW linear cell radar interference mitigation through control of signal delay in radio-over-fiber links
Tetsuya Miura, Kazunori Okuda, Atsushi Kanno, Pham Tien Dat, Nobuhiko Shibagaki, Kenichi Kashima, Yosuke Sato, Masato Fujii, Ryoki Haramoto, Kiyomi Uchida, Tetsuya Hayashi, Sevia M. Idrus, Azura Hamzah, Sumiaty Ambran, Farabi Iqbal, Tetsuya Kawanishi
IEICE Electronics Express 17 ( 15 ) 1 - 5 2020年
掲載種別：研究論文（学術雑誌）
To alleviate the danger of foreign object debris on runways, Frequency Modulated Continuous Wave linear cell radar based detection systems have been evaluated in the literature. This radar uses a 90 GHz millimeter wave and radio-over-fiber (RoF) to achieve high detection accuracy and low cost. This paper reports the experimental results of interference mitigation experiments at Kuala Lumpur International Airport. False images formed due to interference can be suppressed by performing simple signal processing on more than one radar image in which the transmission delay in RoF links is discrepant.
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Wired and wireless seamless networks by photonics
Kawanishi, T., Kanno, A., Dat, P.T., Umezawa, T., Yamamoto, N.
JPhys Photonics 2 ( 1 ) 2020年
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W-Band Optoelectronic Oscillator
Hasanuzzaman, G.K.M., Iezekiel, S., Kanno, A.
IEEE Photonics Technology Letters 32 ( 13 ) 2020年
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Simple Pedestrian Detection Secondary Radar Using Frequency Doubling.
Tetsuya Kawanishi, Satomi Masuda, Erika Shigematsu, Kunihisa Jitsuno, Keizo Inagaki, Atsushi Kanno
22nd International Conference on Transparent Optical Networks(ICTON) 1 - 3 2020年
掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
DOI： 10.1109/ICTON51198.2020.9203134
その他リンク： https://dblp.uni-trier.de/db/conf/icton/icton2020.html#KawanishiMSJIK20
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Optical receiver module design that improves link gain of 28 GHz RF signal over a multi-mode fiber
Yasuda, H., Aiba, T., Kanno, A., Yamamoto, N., Wakabayashi, T., Kawanishi, T.
OSA Continuum 3 ( 5 ) 2020年
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Integrated high-speed photodetector array for SDM communications
Toshimasa Umezawa, Yuki Yoshida, Atsushi Kanno, Naokatsu Yamamoto, Tetsuya Kawanishi
Asia Communications and Photonics Conference, ACP 2019- 2019年11月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：OSA - The Optical Society
We present a two-dimensional high speed photodetector array as a platform technology in receivers, and its applications in space division multiplexing fiber communications, digital coherent direct detection, and free space optical communications.
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Investigation of 100 GHz Output Power Performance in Uni-travelling Carrier Photodetector under Zero-bias Condition
Toshimasa Umezawa, Atsushi Matsumoto, Atsushi Kanno, Naokatsu Yamamoto, Tetsuya Kawanishi
Progress in Electromagnetics Research Symposium 2019- 1813 - 1816 2019年06月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：Institute of Electrical and Electronics Engineers Inc.
We designed and fabricated a zero-bias operational uni-travelling carrier photodetector for high outputs, and achieved a photocurrent saturation of 7 mA and an output saturation of -1 dBm at 110 GHz at 0 V. Furthermore, we observed that the output performance at 0 V could be improved by reducing the thickness of the InP layer to 70% of that in the original design. The results of the simulation showed that the photocurrent and RF output power were nearly doubled in the 100 GHz range. The device design and the experimental results have been discussed herein.
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IEEE802.11ad packet transmission on IF-over-Fiber in the W-Band with SSB optical modulation
Kohei Fujiwara, Atsushi Kanno, Hidehiko Yamaoka, Koichi Tokita
Proceedings of European Microwave Conference in Central Europe, EuMCE 2019 618 - 621 2019年05月
掲載種別：研究論文（国際会議プロシーディングス）
© 2019 EuMCE. We developed an intermediate frequency-over-fiber technology to transmit an IEEE802.11ad packet in the W-band with a simple structure, and demonstrated it using an optical single-sideband modulation. The setup consists of an up-converter, based on a second-order harmonic mixer with a power amplifier, and an optical IQ modulator with an automatic bias control. It can transmit an IEEE802.11ad packet in 16-QAM under an error vector magnitude of 5.9% at the frequency of 88.9 GHz. The proposed IFoF scheme is suitable for a high-speed telecommunications such as the 5th generation mobile system and beyond or a high-resolution radar system in the millimeter-wave.
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25-Gbaud 4-WDM Free-Space Optical Communication Using High-Speed 2-D Photodetector Array 査読あり
Toshimasa Umezawa, Takahide Sakamoto, Atsushi Kanno, Atsushi Matsumoto, Kouichi Akahane, Naokatsu Yamamoto, Tetsuya Kawanishi
Journal of Lightwave Technology 37 ( 2 ) 612 - 618 2019年01月
掲載種別：研究論文（学術雑誌） 出版者・発行元：Institute of Electrical and Electronics Engineers (IEEE)
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Seamless convergence of fiber and wireless systems for 5G and beyond networks
Dat, P.T., Kanno, A., Yamamoto, N., Kawanishi, T.
Journal of Lightwave Technology 37 ( 2 ) 592 - 605 2019年01月
掲載種別：研究論文（学術雑誌） 出版者・発行元：Institute of Electrical and Electronics Engineers ({IEEE})
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High-Speed and Uninterrupted Communication for High-Speed Trains by Ultrafast WDM Fiber–Wireless Backhaul System
Pham Tien Dat, Atsushi Kanno, Keizo Inagaki, Francois Rottenberg, Naokatsu Yamamoto, Tetsuya Kawanishi
Journal of Lightwave Technology 37 ( 1 ) 205 - 217 2019年01月
掲載種別：研究論文（学術雑誌） 出版者・発行元：Institute of Electrical and Electronics Engineers ({IEEE})
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Field Trial of 1.5-Gbps 97-GHz Train Communication System Based on Linear Cell Radio Over Fiber Network for 240-km/h High-Speed Train.
Atsushi Kanno, Pham Tien Dat, Toshimasa Umezawa, Naokatsu Yamamoto, Tetsuya Kawanishi, Nagateru Iwasawa, Nariya Iwaki, Kazuki Nakamura, Kunihiro Kawasaki, Naoki Kanada, Naruto Yonemoto, Yosuke Sato, Masato Fujii, Katsuya Yanatori, Nobuhiko Shibagaki, Kenichi Kashima
Optical Fiber Communications Conference and Exhibition(OFC) 1 - 3 2019年
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Wireless-Optical Signal Converter Utilizing Stacked-Patch Antennas and Electro-Optic Substrates 査読あり
Hiroshi Murata, Hironori Aya, Toshiyuki Inoue, Atsushi Sanada, Yusuf Nur Wijayanto, Atsushi Kanno, Tetsuya Kawanishi
Lecture Notes in Electrical Engineering 555 219 - 232 2019年
掲載種別：研究論文（国際会議プロシーディングス）
© 2019, Springer Nature Singapore Pte Ltd. We have proposed and developed a new wireless-optical signal converter utilizing stacked-patch antennas with a narrow gap and electro-optic (EO) crystal films for millimeter-wave radio-over-fiber systems. This converting device utilizes a structure of vertically stacked-patch antennas like the Yagi–Uda antenna, with a hybrid substrate composed of EO crystal films and low-dielectric-constant material plates. The electric field for wireless-optical signal conversion and the size of the patch antenna are increased by introducing the antenna and substrate stacked structure. Therefore, the conversion efficiency from wireless to optical signals can be improved. In the analysis by use of HFSS, the operational frequency was shifted to the higher range by 7Â GHz, and the optical modulation index was improved by 3.2Â dB with the double-stacked structure. In the experiments, the operational frequency shift by 8Â GHz and the modulation index improvement by 3.0Â dB were verified successfully, and the measured frequency response and directivity were in good agreement with the designed ones. The conversion of wireless 60Â GHz band signals with QPSK modulation and the transfer of the converted signal over 1Â km long fiber were also demonstrated.
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Experimental Evaluation of Wavelength-Dependence of Thin-Film LiNbO3 Modulator with an Extinction-Ratio-Tunable Structure
Yuya Yamaguchi, Atsushi Kanno, Naokatsu Yamamoto, Tetsuya Kawanishi
2019 24TH OPTOELECTRONICS AND COMMUNICATIONS CONFERENCE (OECC) AND 2019 INTERNATIONAL CONFERENCE ON PHOTONICS IN SWITCHING AND COMPUTING (PSC) 2019年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
We investigate the operation of a thin-film lithium niobite modulator with specific focus on the wavelength dependence. For a precise evaluation of the modulation distortion, we used an extinction-ratio-tunable-type modulator.
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300-GHz Bistatic Radar System by Radio Over Fiber Network Technology
Kanno, A., Sekine, N., Kasamatsu, A., Yamamoto, N., Kawanishi, T.
Lecture Notes in Electrical Engineering 555 2019年
掲載種別：研究論文（学術雑誌） 出版者・発行元：Lecture Notes in Electrical Engineering
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Characteristic evaluation of 20-bit consecutive codes in high performance optical burst mode receiver configuration
Mazwar, A., Hamzah, A., Idrus, S., Kanno, A., Mohamed, N.
Indonesian Journal of Electrical Engineering and Computer Science 15 ( 2 ) 2019年
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Automatic bias control for radio-over-fiber-based train communication network system with single-sideband modulation
Atsushi Kanno, Naokatsu Yamamoto, Kohei Fujiwara, Kouichi Tokita
Proceedings of SPIE - The International Society for Optical Engineering 10945 2019年
掲載種別：研究論文（国際会議プロシーディングス）
For high-speed train communication system, broadband analog radio-over-fiber based backhaul networks with a centralized processing unit can reduce hard hand-over processes by prediction of train location and be tracking the train by adaptive optical path routing. In the system, an automatic bias control technique without any dither signals is important to avoid the degradation of the throughput. In the study, we design and demonstrate a single-sideband optical modulation using an optical IQ modulator.
DOI： 10.1117/12.2509061
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Design of Optical Receiver for 28 GHz RF Transmission over Multi-mode Fiber.
Hiroki Yasuda, Takamitsu Aiba, Satoshi Tanaka, Toshinori Suzuki, Atsushi Kanno, Naokatsu Yamamoto, Tetsuya Kawanishi, Tomohiro Wakabayashi
2019 24th OptoElectronics and Communications Conference (OECC) and 2019 International Conference on Photonics in Switching and Computing (PSC)(OECC/PSC) 1 - 3 2019年
掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
その他リンク： https://dblp.uni-trier.de/db/conf/ps/psc2019.html#YasudaATSKYKW19
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Wireless signal encapsulation in a seamless fiber-millimeter wave system
Dat, P.T., Kanno, A., Yamamoto, N., Kawanishi, T.
Optical and Wireless Convergence for 5G Networks 2019年
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Radio Over Fiber System for Uninterrupted High-Speed Railway Communications.
Atsushi Kanno, Tetsuya Kawanishi
2019 24th OptoElectronics and Communications Conference (OECC) and 2019 International Conference on Photonics in Switching and Computing (PSC)(OECC/PSC) 1 - 2 2019年
掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
その他リンク： https://dblp.uni-trier.de/db/conf/ps/psc2019.html#KannoK19
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Photonic systems and devices for linear cell radar
Kawanishi, T., Kanno, A., Dat, P.T., Umezawa, T., Yamamoto, N.
Applied Sciences (Switzerland) 9 ( 3 ) 2019年
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Integrated Fiber-Wireless System in W Band for Ultra-Dense Small-Cell and Moving-Cell Network.
Pham Tien Dat, Atsushi Kanno, Naokatsu Yamamoto, Tetsuya Kawanishi
2019 IEEE Globecom Workshops 1 - 5 2019年
掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
DOI： 10.1109/GCWkshps45667.2019.9024645
その他リンク： https://dblp.uni-trier.de/db/conf/globecom/globecom2019w.html#DatKYK19
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Hybrid Optical Wireless-mmWave: Ultra High-Speed Indoor Communications for Beyond 5G.
Pham Tien Dat, Atsushi Kanno, Keizo Inagaki, Toshimasa Umezawa, Naokatsu Yamamoto, Tetsuya Kawanishi
IEEE INFOCOM 2019 - IEEE Conference on Computer Communications Workshops 1003 - 1004 2019年
掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
DOI： 10.1109/INFCOMW.2019.8845283
その他リンク： https://dblp.uni-trier.de/db/conf/infocom/infocom2019w.html#DatKIUYK19
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High-Speed and Uninterrupted Communication for High-Speed Trains by Ultrafast WDM Fiber-Wireless Backhaul System
Dat, P.T., Kanno, A., Inagaki, K., Rottenberg, F., Yamamoto, N., Kawanishi, T.
Journal of Lightwave Technology 37 ( 1 ) 2019年
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Evaluation of Bend-Insensitive Plastic and Glass Fiber for 28-GHz RF Transmission.
Takamitsu Aiba, Hiroki Yasuda, Atsushi Kanno, Naokatsu Yamamoto, Tetsuya Kawanishi, Tomohiro Wakabayashi
2019 24th OptoElectronics and Communications Conference (OECC) and 2019 International Conference on Photonics in Switching and Computing (PSC)(OECC/PSC) 1 - 3 2019年
掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
その他リンク： https://dblp.uni-trier.de/db/conf/ps/psc2019.html#AibaYKYKW19
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Terahertz-Wave Communication System Using a Traveling-Wave Tube Amplifier
Atsushi Kanno, Norihiko Sekine, Akifumi Kasamatsu, Naokatsu Yamamoto, Mitsuru Yoshida, Norio Masuda
Progress in Electromagnetics Research Symposium 2018- 2405 - 2409 2018年12月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：Institute of Electrical and Electronics Engineers Inc.
We propose a THz communication system using the combination of high-gain antennas and an amplifier chain. A Cassegrain antenna used as a high-gain antenna enhances a link gain with an antenna gain of 40 dBi or more. Finally, an effective isotropic radiated power is achieved more than 40 dBm. The proof-of-concept demonstration is performed for the realization of THz point-to-point communication systems with moderate spectral efficiency.
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400-Gbps Space Division Multiplexing Optical Wireless Communication Using Two-Dimensional Photodetector Array
Toshimasa Umezawa, Takahide Sakamoto, Atsushi Kanno, Shinya Nakajima, Atsushi Matsumoto, Naokatsu Yamamoto, Tetsuya Kawanishi
European Conference on Optical Communication, ECOC 2018- 2018年11月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：Institute of Electrical and Electronics Engineers Inc.
We demonstrate 400-Gbps multi-core fiber based optical wireless communication using a newly developed two-dimensional photodetector array (2D-PDA). The 19-parallel beam from 19-core fiber can be successfully coupled with a 19-pixel 2D-PDA in free space.
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45-Gbaud, 32-pixel 2D-PDA for Multi-Core Fiber-Based Optical Wireless Communication
Toshimasa Umezawa, Takahide Sakamoto, Atsushi Kanno, Atsushi Matsumoto, Naokatsu Yamamoto, Tetsuya Kawanishi
31st Annual Conference of the IEEE Photonics Society, IPC 2018 2018年11月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：Institute of Electrical and Electronics Engineers Inc.
We developed a 45-Gbaud, 32-pixel two-dimensional photodetector array (2D-PDA) device for multi-core based free-space optical (FSO) communication. In the demonstration using the multicore fiber (MCF) and 2D-PDA in free space, the simultaneous detection of four high-data-rate parallel beams was successfully achieved.
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Self-Oscillating Optical Frequency Comb: Application to Low Phase Noise Millimeter Wave Generation and Radio-Over-Fiber Link
G. K. M. Hasanuzzaman, Atsushi Kanno, Pham Tien Dat, Stavros Iezekiel
Journal of Lightwave Technology 36 ( 19 ) 4535 - 4542 2018年10月
掲載種別：研究論文（学術雑誌） 出版者・発行元：Institute of Electrical and Electronics Engineers ({IEEE})
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90-GHz Linear-Cell Systems for Public Transportation Systems
Tetsuya Kawanishi, Atsushi Kanno, Naokatsu Yamamoto
International Conference on Transparent Optical Networks 2018- 2018年09月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE Computer Society
This paper reviews 90-GHz high-speed wireless links and high-resolution radars based on linear-cell systems consisting of radio-over-fibre for waveform distribution. We focus on applications for public transportation systems including airport runways, railways, etc.
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High Speed 2-D Photodetector Array for Space and Mode-Division Multiplexing Fiber Communications 査読あり
Umezawa Toshimasa, Sakamoto Takahide, Kanno Atsushi, Yamamoto Naokatsu, Kawanishi Tetsuya
JOURNAL OF LIGHTWAVE TECHNOLOGY 36 ( 17 ) 3684 - 3692 2018年09月
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Performance Evaluation of Full-Duplex MIMO Seamless Fiber-Wireless System in W -Band 査読あり
Pham Tien Dat, Atsushi Kanno, Naokatsu Yamamoto, Tetsuya Kawanishi
IEEE Photonics Technology Letters 30 ( 13 ) 1175 - 1178 2018年07月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Institute of Electrical and Electronics Engineers Inc.
We present a full-duplex fiber-wireless system in the $W$ -band for simultaneous transmission of multiple-input multiple-output (MIMO) signals in downlink and uplink directions. The proposed system uses wavelength-division multiplexing in the optical link and parallel-aligned/orthogonally aligned antenna polarizations in the wireless link for the MIMO and full-duplex signal transmission. Satisfactory performance is experimentally confirmed for 2× 2 MIMO OFDM and LTE-A signals in both directions. The system is highly spectral-efficient and scalable for large-scale MIMO signal transmission.
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Wired and Wireless Links to Bridge Networks: Seamlessly Connecting Radio and Optical Technologies for 5G Networks 査読あり
Tetsuya Kawanishi, Atsushi Kanno, Hugo S.C. Freire
IEEE Microwave Magazine 19 ( 3 ) 102 - 111 2018年05月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Institute of Electrical and Electronics Engineers Inc.
As fifth-generation (5G) technology is expected to offer super-broadband mobile services with new features such as low latency for critical applications and low-power operation for Internet of Things (IoT) applications, it will use wireless interfaces for small or spot cells with a new RF resource, the high band (frequencies above 6 GHz), in addition to the low band (below 6 GHz) on macro and small cells coexisting with conventional mobile technologies [1]-[4]. Another feature of 5G wireless interfaces is more precise control of radio waves in space division through the use of multi-antenna technologies, such as massive multiple-input/multiple-output (MIMO) or beamforming [5].
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Linearized LiNbO3 Modulator with Dual Mach-Zehnder Interferometer and Branched Asymmetric CPW Electrode 査読あり
Yuya Yamaguchi, Atsushi Kanno, Naokatsu Yamamoto, Tetsuya Kawanishi, Hirochika Nakajima
European Conference on Optical Communication, ECOC 2017- 1 - 3 2018年04月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：Institute of Electrical and Electronics Engineers Inc.
We propose a transfer-function-transformed optical modulator by introducing a branched asymmetric coplanar waveguide electrode. The structure has the potential to achieve low half-wave voltage and large bandwidth while maintaining its flexibility. We confirmed a linearity improvement with the fabricated modulator.
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Dense SDM 32-Pixel 2-D Photodetector Array 査読あり
Toshimasa Umezawa, Tadashige Sakamoto, Atsushi Kanno, Ken Kusakata, Kouichi Akahane, Atsushi Matsumoto, Naokatsu Yamamoto, Tetsuya Kawanishi
European Conference on Optical Communication, ECOC 2017- 1 - 3 2018年04月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：Institute of Electrical and Electronics Engineers Inc.
We present a newly developed 32-pixel, high-speed 2D photodetector array operated at 25 Gbps (NRZ) with SMF and MCF, targeting direct coupling to MCF and FMF in dense SDM communications.
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Spatial Coherent Matched Detection Using High-Speed Two Dimensional Photo-Diode Array for Full-Channel Demultiplexing and Demodulation of Mode-Division-Multiplexed Signals 査読あり
Takahide Sakamoto, Toshimasa Umezawa, Guo-Wei Lu, Koichi Akahane, Atsushi Matsumoto, Atsushi Kanno, Naokatsu Yamamoto, Tetsuya Kawanishi
European Conference on Optical Communication, ECOC 2017- 1 - 3 2018年04月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：Institute of Electrical and Electronics Engineers Inc.
We propose and demonstrate spatial coherent matched detection using two-dimensional high-speed photodiode array. Capturing amplitude and phase distribution, all tributaries of 3×20-Gb/s MDM-QPSK are simultaneously demultiplexed and coherently demodulated without using optical modal fan-out devices.
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2 × 2 MIMO FBMC-OQAM Signal Transmission over a Seamless Fiber-Wireless System in the W-band 査読あり
Francois Rottenberg, Pham Tien Dat, Trung-Hien Nguyen, Atsushi Kanno, Francois Horlin, Jerome Louveaux, Naokatsu Yamamoto
IEEE Photonics Journal 10 ( 2 ) 2018年04月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Institute of Electrical and Electronics Engineers Inc.
Offset-QAM-based filterbank multicarrier (FBMC-OQAM) is an attractive modulation candidate to increase the spectral efficiency of radio-over-fiber and fiber-wireless systems. In this paper, we first propose a general framework for MIMO FBMC-OQAM transmission systems, including the description of algorithms for mitigation of the channel impairments. The proposed design is scalable in the number of transmitted streams and flexible as multiple asynchronous users can be accommodated. The proposed system is experimentally validated in a 2 × 2 MIMO FBMC-OQAM signal over a seamless fiber-wireless in the W-band for the first time. Satisfactory performance is confirmed for a data rate of up to 18 Gb/s in both downlink and uplink directions. Furthermore, algorithms previously proposed by the authors for channel estimation and phase noise compensation are experimentally validated, confirming their effectiveness. Finally, we show that, for a similar error vector magnitude performance, an FBMC-OQAM system can achieve a 25% higher throughput rate than a corresponding orthogonal frequency division multiplexing-based fiber-wireless system.
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Millimeter-Wave Integrated Photoreceivers for High Data Rate Photonic Wireless Communication 査読あり
Toshimasa Umezawa, Kunihisa Jitsuno, Pham Tien Dat, Kenichi Kashima, Atsushi Kanno, Naokatsu Yamamoto, Tetsuya Kawanishi
IEEE Journal of Selected Topics in Quantum Electronics 24 ( 2 ) 2018年03月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Institute of Electrical and Electronics Engineers Inc.
We report on the use of 30 and 100 GHz integrated millimeter-wave photoreceivers in high data rate photonic wireless communication. The role of the bandwidth of a narrow-band photoreceiver in increasing the data rate of wireless single carrier transmission is discussed. An 11-GHz bandwidth photoreceiver achieved a data rate of 44.6 Gb/s using an 8 GBd, 64-QAM (quadrature amplitude modulation) signal. A wider bandwidth (19 GHz) integrated photoreceiver was designed and fabricated for use in the 100-GHz range. High-frequency response photoreceivers have the following advantages: they operate in a wide bandwidth easily, use frequency resources efficiently, and are subject to low amounts of atmospheric attenuation. In addition to the single carrier wireless transmission study, a high data rate (12 Gb/s) multicarrier radio over fiber (16-QAM in orthogonal frequency division multiplexing) transmission experiment was demonstrated in order to confirm the ability to increase the data rate with a wide operational bandwidth.
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W-band millimeter-wave patch antennas on optical modulator for runway security systems 査読あり
Yusuf Nur Wijayanto, Atsushi Kanno, Hiroshi Murata, Tetsuya Kawanishi, Purwoko Adhi
2017 IEEE Conference on Antenna Measurements and Applications, CAMA 2017 2018- 79 - 82 2018年01月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：Institute of Electrical and Electronics Engineers Inc.
We propose and report W-band millimeter-wave patch antennas on an optical modulator for foreign object debris (FOD) detection to support runway security systems. The proposed device can be used for receiving wireless millimeter-wave signals and converting to lightwave signals trough optical fiber networks for distribution. In experiment, the proposed device was fabricated successfully in an array structure. In measurement, about 40dB optical sidebands to carrier ratio was obtained. Approximately 6GHz bandwidth was also obtained using the fabricated devices.
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Photonics-based millimeter-wave radar system for handheld applications 査読あり
Atsushi Kanno, Kaori Fukunaga, Naokatsu Yamamoto, Tetsuya Kawanishi
2017 IEEE Conference on Antenna Measurements and Applications, CAMA 2017 2018- 334 - 336 2018年01月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：Institute of Electrical and Electronics Engineers Inc.
A frequency-modulated continuous-wave (FM-CW) radar system at 94 GHz with a bandwidth of 2 GHz is configured by an optical millimeter-wave synthesizer for short-range application in handheld operation. Combination of an inertial measurement unit and a fiber-remoted radar system help realizing simple radar head configuration.
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Millimeter-Wave Radio-Over-Fiber Network for Linear Cell Systems 査読あり
Atsushi Kanno, Pham Tien Dat, Naokatsu Yamamoto, Tetsuya Kawanishi
Journal of Lightwave Technology 36 ( 2 ) 533 - 540 2018年01月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Institute of Electrical and Electronics Engineers Inc.
We discuss and propose millimeter-wave linear cell systems for signal distribution on railway radiocommunication systems between train and trackside, and a foreign object debris detection system for airport runways using the radio-over-fiber network technology. Linear cell configurations based on wavelength-division multiplexing (WDM) and power-splitter-based distribution networks are discussed and demonstrated experimentally. A single-sideband modulation for data transmission in an intermediate frequency over a fiber system is successfully transmitted with an ultrafast wavelength-tunable laser diode for WDM routing to track the train car within 3 μs. Radar signal distribution by an optical double-sideband suppressed-carrier modulation mitigates the dispersion effect of the fiber cable to transmit a 32-GHz signal into the remote radar heads.
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100-GHz Radio and Power over Fiber Transmission Through Multicore Fiber Using Optical-to-Radio Converter 査読あり
Toshimasa Umezawa, Pham Tien Dat, Kenichi Kashima, Atsushi Kanno, Naokatsu Yamamoto, Tetsuya Kawanishi
Journal of Lightwave Technology 36 ( 2 ) 617 - 623 2018年01月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Institute of Electrical and Electronics Engineers Inc.
We designed and fabricated a 100-GHz range integrated photoreceiver with zero-bias operational uni-traveling-carrier photodiode and pseudomorphic high electron mobility transistor amplifier, which performed the roles of photonic power generation and 100-GHz RF signal generation. Using the integrated photoreceiver, high data rate radio- and power-over-fiber transmission through multicore fiber communication was demonstrated. Subsequently, a bit error rate of 1× 10- 3 could be achieved with 12 Gb/s, orthogonal frequency division multiplexing, 16 quadrature amplitude modulation, and an intermediate frequency of 92 GHz. The crosstalk issue in radio- and power-over-fiber transmission through multicore fiber was discussed.
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Evaluation of wavelength dependence of integrated MZM using balanced-bridge and asymmetric X waveguide structures for high extinction ratio modulation 査読あり
Yasunari Hanawa, Yuya Yamaguchi, Atsushi Kanno, Tetsuya Kawanishi, Hirochika Nakajima
22nd Microoptics Conference, MOC 2017 2017- 292 - 293 2018年01月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：Institute of Electrical and Electronics Engineers Inc.
In this study, we measure the wavelength dependence on the device operation of integrated Mach-Zehnder modulators in cascade. We use a balanced-bridge and asymmetric X coupler. We investigate the extinction ratio and bias voltage of these structures, and calculate the relationship between the phase change and the imperfect-bias extinction ratio.
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High extinction ratio LN modulator with low half-wave voltage and small chirp by using thin substrate 査読あり
Yuya Yamaguchi, Atsushi Kanno, Naokatsu Yamamoto, Tetsuya Kawanishi, Hirochika Nakajima
22nd Microoptics Conference, MOC 2017 2017- 36 - 37 2018年01月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：Institute of Electrical and Electronics Engineers Inc.
We investigate the characteristics of LN modulator using thin substrate in both calculation and experiment. The fabricated active Y-branch integrated Mach-Zehnder modulator using thin LN substrate showed a good performance such as low half-wave voltage of 1.23 V, small chirp parameter of 0.013, and high extinction ratio of 44 dB.
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Pre-distortion technique for compensating QAM signal distortions generated by dual-parallel Mach-Zehnder modulators with low-extinction ratio and small-chirp parameter 査読あり
Yutaro Kodama, Yuya Yamaguchi, Atsushi Kanno, Tetsuya Kawanishi, Hirochika Nakajima
22nd Microoptics Conference, MOC 2017 2017- 50 - 51 2018年01月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：Institute of Electrical and Electronics Engineers Inc.
We propose a pre-distortion method in the electrical domain to compensate for IQ-distortion that is attributed to some imbalances of dual-parallel Mach-Zehnder modulators for optical QAM. We confirmed the effect of the method by performing calculations, and the calculation results show the potential to improve the signal quality.
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Broadband Optical Phase Modulator Based on Electro-Optic Polymer
Yuya Yamaguchi, Atsushi Kanno, Naokatsu Yamamoto, Shingo Takano, Satoshi Oikawa, Akira Otomo, Tetsuya Kawanishi
2018 INTERNATIONAL TOPICAL MEETING ON MICROWAVE PHOTONICS (MWP) 2018年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
We devised a broadband optical phase modulator using an electro-optic polymer material, which is lucrative for its potential for application as the material used in high-speed modulator. It has the possibility to achieve low half-wave voltage and large bandwidth simultaneously. The measured 3-dBo bandwidth of the fabricated modulator reached 50 GHz.
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IEEE 802.11ad Packet Transmission Based SSB Optical Modulation on Radio-over-Fiber in the 90-GHz Band
Kohei Fujiwara, Atsushi Kanno, Koichi Tokita
2018 48TH EUROPEAN MICROWAVE CONFERENCE (EUMC) 712 - 715 2018年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
In order to realize a high-speed wireless link for a high-speed vehicle, such as a bullet train, we propose a radio over fiber (RoF) technique with a single-sideband optical modulator. The system is compliant with the IEEE 802.11ad standard and operation in the W-band is successful. The optical modulator is driven by an automatic bias controller. In this paper, we report a demonstration of the RoF system, which has archived an error vector magnitude of 4.8% on 16-QAM.
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Full-Duplex and scalable MIMO fiber-wireless seamless system in W-Band for future mobile networks 査読あり
Pham Tien Dat, Atsushi Kanno, Naokatsu Yamamoto, Tetsuya Kawanishi
Optics InfoBase Conference Papers 2018 2018年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：OSA - The Optical Society
We present a scalable fiber-wireless system in W-band for the simultaneous transmission of MIMO signals in both downlink and uplink directions. Satisfactory performance is confirmed for 2 × 2 MIMO OFDM and LTE-A signals in both directions.
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Direct coupling between 2D-PDA and triangular/square shape aligned MCF for universal SDM photoreceiver 査読あり
T. Umezawa, T. Sakamoto, A. Kanno, N. Yamamoto, T. Kawanishi
Optics InfoBase Conference Papers 2018 2018年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：OSA - The Optical Society
We successfully achieved the high coupling efficiencies and alignment tolerances between a newly developed 10-GHz 32-pixel two dimensional photodetector array (2D-PDA) and triangular- and square-shape-aligned multi-core fiber (MCF) for universal SDM photoreceivers.
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Radio over fiber network technology for millimeter-wave distributed radar systems 査読あり
Atsushi Kanno
Proceedings of SPIE - The International Society for Optical Engineering 10559 2018年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：SPIE
Millimeter-wave radar technology in a frequency band of 96 GHz is promising to detect small objects with a high range resolution because of its short wavelength and broadness of available bandwidths of 8 GHz. However, transmission distance in the millimeter-wave bands is limited by high atmospheric attenuation. Radio over fiber (RoF) technology should be implemented to transport these millimeter-wave signals to remote radar heads via an optical fiber network. In the study, we discuss the RoF network for distributed radar systems in the millimeter-wave and submillimeter-wave bands.
DOI： 10.1117/12.2287731
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Radio-over-fiber-based seamless fiber-wireless convergence for small cell and linear cell networks 査読あり
Pham Tien Dat, Atsushi Kanno, Naokatsu Yamamoto, Tetsuya Kawanishi
Optics InfoBase Conference Papers 2018 2018年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：OSA - The Optical Society
We present radio-over-fiber technologies for fiber and wireless convergence for small cell and linear cell networks, including a flexible and low-latency mobile fronthaul for ultra-dense small cells, and high-speed wireless backhaul system for high-speed trains.
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Study of high power generation in UTC-PD at 110-210 GHz 査読あり
Toshimasa Umezawa, Atsushi Kanno, Kouichi Akahane, Atsushi Matsumoto, Naokatsu Yamamoto, Tetsuya Kawanishi
Proceedings of SPIE - The International Society for Optical Engineering 10531 2018年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：SPIE
We designed and fabricated a low-bias operational uni-travelling carrier photodiode (UTC-PD) structure, which can be operated at over 100 GHz. The main structure of the device consisted of p-doped InGaAs for the photo-absorption layer and non-doped InP for the carrier collector layer, to obtain both a high electron drift velocity at a low bias and a small CR time constant based on the pn-junction capacitance. Through an on-wafer probing test, the frequency response was measured up to 210 GHz using a 1 mm coaxial connecter type (DC-110GHz), W-band (75-110 GHz) and G-band (140-220 GHz) waveguide probe with a spectrum analyzer. In the measurement results, a large bandwidth of 10 MHz-110 GHz could be obtained with good flatness within ±1 dB. When the W-band and G-band performance were characterized, the high-power characteristic of -3.8 dBm could be achieved at 106 GHz. and the output power level of - 19.8 dBm could be confirmed at 210 GHz as well.
DOI： 10.1117/12.2287589
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W-band radio-over-fiber link based on self-oscillating optical frequency comb generator 査読あり
G. K.M. Hasanuzzaman, Atsushi Kanno, Pham Tien Dat, Stavros Iezekiel
Optics InfoBase Conference Papers 2018 2018年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：OSA - The Optical Society
A 94.8 GHz radio-over-fiber link was implemented with a self-oscillating frequency comb. An LTE Advanced OFDM FDD 64-QAM signal of 20 MHz bandwidth was transmitted over 1.3 m wireless distance with an EVM of 2.23%.
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Wave-band multiplexed 20-Gb/s QPSK simultaneous transmission over 4-km holey fiber in O- and T-bands with homodyne detection 査読あり
Shoko Yamada, Atsushi Kanno, Naokatsu Yamamoto, Hideyuki Sotobayashi
Proceedings of SPIE - The International Society for Optical Engineering 10561 2018年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：SPIE
A sharp growth in the transmission capacities of photonic transport networks has necessitated an increase in the spectral efficiency and number of wavelength channels. Advanced photonic transport technology in the T-band (thousand band: 1000-1260 nm, available bandwidth of 61.9 THz) is a promising solution to expanding the usable wavelength channels for optical communication to increase the available capacity. The available bandwidth in the T-band is approximately five times that of the conventional C- and L-bands, and, therefore, we propose an ultra-broadband photonic transport system that employs waveband multiplexing technology which is compatible with both novel and conventional wavebands. Wavelength-tunable quantum dot (QD) laser technologies aid the availability of the T-band with its wide wavelength tunability. An endlessly single-mode holey fiber (HF) is used as a wave-band multiplexing transmission line in the O- and T-bands. Optimizing the spectral efficiency is key to realizing high-capacity transmission using advanced digital signal processing (DSP) technology with a coherent detection scheme. In the study, we successfully demonstrated error-free transmission with 20-Gb/s quadrature phase-shift keying (QPSK) using homodyne detection receivers in the O- and T-bands simultaneously over a 4-km long HF. The measured bit error rates (BERs) were within the forward error correction limit of 2×10-3 in both the O- and T-bands. The large number of wavelength channels with conventional use of the O- and T-bands should help increase the total capacity of an optical fiber to meet the growth in demand of optical communication data traffic.
DOI： 10.1117/12.2288966
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High-speed and handover-free communications for high-speed trains using switched WDM fiber-wireless system 査読あり
Pham Tien Dat, Atsushi Kanno, Keizo Inagaki, Toshimasa Umezawa, François Rottenberg, Je´rome Louveaux, Naokatsu Yamamoto, Tetsuya Kawanishi
Optics InfoBase Conference Papers 2018 2018年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：OSA - The Optical Society
A high-speed, handover-free communication for high-speed trains by a switched WDM fiber-wireless system in the W-band is presented. More than 20 Gb/s signal transmission with a cell switching time of less than 4 μs is experimentally demonstrated.
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Wave-band multiplexed 20-Gb/s QPSK simultaneous transmission over 4-km holey fiber in O- and T-bands with homodyne detection 査読あり
Shoko Yamada, Atsushi Kanno, Naokatsu Yamamoto, Hideyuki Sotobayashi
Proceedings of SPIE - The International Society for Optical Engineering 10561 2018年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：SPIE
A sharp growth in the transmission capacities of photonic transport networks has necessitated an increase in the spectral efficiency and number of wavelength channels. Advanced photonic transport technology in the T-band (thousand band: 1000-1260 nm, available bandwidth of 61.9 THz) is a promising solution to expanding the usable wavelength channels for optical communication to increase the available capacity. The available bandwidth in the T-band is approximately five times that of the conventional C- and L-bands, and, therefore, we propose an ultra-broadband photonic transport system that employs waveband multiplexing technology which is compatible with both novel and conventional wavebands. Wavelength-tunable quantum dot (QD) laser technologies aid the availability of the T-band with its wide wavelength tunability. An endlessly single-mode holey fiber (HF) is used as a wave-band multiplexing transmission line in the O- and T-bands. Optimizing the spectral efficiency is key to realizing high-capacity transmission using advanced digital signal processing (DSP) technology with a coherent detection scheme. In the study, we successfully demonstrated error-free transmission with 20-Gb/s quadrature phase-shift keying (QPSK) using homodyne detection receivers in the O- and T-bands simultaneously over a 4-km long HF. The measured bit error rates (BERs) were within the forward error correction limit of 2×10-3 in both the O- and T-bands. The large number of wavelength channels with conventional use of the O- and T-bands should help increase the total capacity of an optical fiber to meet the growth in demand of optical communication data traffic.
DOI： 10.1117/12.2288966
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W-band radio-over-fiber link based on self-oscillating optical frequency comb generator 査読あり
G. K.M. Hasanuzzaman, Atsushi Kanno, Pham Tien Dat, Stavros Iezekiel
Optics InfoBase Conference Papers 2018 2018年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：OSA - The Optical Society
A 94.8 GHz radio-over-fiber link was implemented with a self-oscillating frequency comb. An LTE Advanced OFDM FDD 64-QAM signal of 20 MHz bandwidth was transmitted over 1.3 m wireless distance with an EVM of 2.23%.
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Study of high power generation in UTC-PD at 110-210 GHz 査読あり
Toshimasa Umezawa, Atsushi Kanno, Kouichi Akahane, Atsushi Matsumoto, Naokatsu Yamamoto, Tetsuya Kawanishi
Proceedings of SPIE - The International Society for Optical Engineering 10531 2018年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：SPIE
We designed and fabricated a low-bias operational uni-travelling carrier photodiode (UTC-PD) structure, which can be operated at over 100 GHz. The main structure of the device consisted of p-doped InGaAs for the photo-absorption layer and non-doped InP for the carrier collector layer, to obtain both a high electron drift velocity at a low bias and a small CR time constant based on the pn-junction capacitance. Through an on-wafer probing test, the frequency response was measured up to 210 GHz using a 1 mm coaxial connecter type (DC-110GHz), W-band (75-110 GHz) and G-band (140-220 GHz) waveguide probe with a spectrum analyzer. In the measurement results, a large bandwidth of 10 MHz-110 GHz could be obtained with good flatness within ±1 dB. When the W-band and G-band performance were characterized, the high-power characteristic of -3.8 dBm could be achieved at 106 GHz. and the output power level of - 19.8 dBm could be confirmed at 210 GHz as well.
DOI： 10.1117/12.2287589
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Radio-over-fiber-based seamless fiber-wireless convergence for small cell and linear cell networks 査読あり
Pham Tien Dat, Atsushi Kanno, Naokatsu Yamamoto, Tetsuya Kawanishi
Optics InfoBase Conference Papers 2018 2018年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：OSA - The Optical Society
We present radio-over-fiber technologies for fiber and wireless convergence for small cell and linear cell networks, including a flexible and low-latency mobile fronthaul for ultra-dense small cells, and high-speed wireless backhaul system for high-speed trains.
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Radio over fiber network technology for millimeter-wave distributed radar systems 査読あり
Atsushi Kanno
Proceedings of SPIE - The International Society for Optical Engineering 10559 2018年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：SPIE
Millimeter-wave radar technology in a frequency band of 96 GHz is promising to detect small objects with a high range resolution because of its short wavelength and broadness of available bandwidths of 8 GHz. However, transmission distance in the millimeter-wave bands is limited by high atmospheric attenuation. Radio over fiber (RoF) technology should be implemented to transport these millimeter-wave signals to remote radar heads via an optical fiber network. In the study, we discuss the RoF network for distributed radar systems in the millimeter-wave and submillimeter-wave bands.
DOI： 10.1117/12.2287731
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High-speed two-dimensional photodetector array for 4- WDM 25-Gbaud FSO communication 査読あり
Toshimasa Umezawa, Takahide Sakamoto, Atsushi Kanno, Kouich Akahane, Atsushi Matsumoto, Naokatsu Yamamoto, Tetsuya Kawanishi
Optics InfoBase Conference Papers 2018 2018年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：OSA - The Optical Society
We present a newly developed 32-pixel high-speed 2D photodetector array operated at up to 39 Gbaud, and its application for WDM FSO communicat ions. 4-WDM 25-Gbaud FSO parallel beams could be directly detected by the 2D-PDA.
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Optical Modulator with the Digitized Transfer Function for Multilevel Amplitude Shift Keying
Yuya Yamaguchi, Atsushi Kanno, Naokatsu Yamamoto, Tetsuya Kawanishi
2018 EUROPEAN CONFERENCE ON OPTICAL COMMUNICATION (ECOC) 2018年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
We propose and devise a digitized optical modulator for 4-ASK. The proposed device enables optical modulation and waveform shaping for multilevel amplitude shift keying simultaneously. The measured transfer function of the fabricated modulator shows good agreement with the designed function.
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Cell-Less Network for Handover-Free Communications to High-Speed Trains Using a Switched WDM Fiber-Wireless Backhaul.
Pham Tien Dat, Atsushi Kanno, Keizo Inagaki, Naokatsu Yamamoto, Tetsuya Kawanishi
European Conference on Optical Communication(ECOC) 1 - 3 2018年
掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
DOI： 10.1109/ECOC.2018.8535484
その他リンク： https://dblp.uni-trier.de/db/conf/ecoc/ecoc2018.html#DatKIYK18
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O-L band bias-free high-speed UTC-PD for advanced optical fiber communications
Toshimasa Umezawa, Atsushi Kanno, Kouichi Akahane, Atsushi Matsumoto, Naokatsu Yamamoto
Optics InfoBase Conference Papers 2018 2018年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：OSA - The Optical Society
In this report, we present an O-L band high-baud-rate UTC photodetector excluding a bias circuit, which can be operated at zero bias. The measured responsivity over 0.13 A/W was fully covered in the range (O-L), and the 100 Gbaud (NRZ) good eye diagram performances were confirmed at 0 V for wavelengths of 1320 nm and 1550 nm.
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Self-oscillating optical frequency comb: Application to low phase noise millimeter wave generation and radio-over-fiber link
Hasanuzzaman, G.K.M., Kanno, A., Dat, P.T., Iezekiel, S.
Journal of Lightwave Technology 36 ( 19 ) 2018年
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Optical frequency comb applied optoelectronic oscillator for millimeter-wave signal generation and its application
Atsushi Kanno, G. K.M. Hasanuzzaman, Naokatsu Yamamoto, Stavros Iezekiel
Proceedings of SPIE - The International Society for Optical Engineering 10634 2018年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：SPIE
Highly precise signal generation technique is a key for the realization of low-noise radar and ghost-less imaging in millimeter-wave bands. Current technologies based on an oven-controlled oscillator has a better phase noise characteristic
however, relatively low frequency requires multiplication technique to upconvert the signal into millimeter-wave range. In the study, we configured an optoelectronic oscillator (OEO) employed with an optical frequency comb generation using an optical modulator. An optical filter bank implemented in the OEO loop performs an optical path optimization to realize 95-GHz millimeter-wave signal with a phase noise of-86 dBc/Hz at an offset frequency of 10 kHz.DOI： 10.1117/12.2304821
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Radio over fiber network technologies for linear cell systems in millimeter-wave bands 査読あり
Atsushi Kanno, Pham Tien Dat, Naokatsu Yamamoto, Tetsuya Kawanishi
2017 International Symposium on Antennas and Propagation, ISAP 2017 2017- 1 - 2 2017年12月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：Institute of Electrical and Electronics Engineers Inc.
Millimeter-wave signal feeding technique to remote radio transceivers via an optical fiber network is discussed particularly in linear cell configurations using radio over fiber technologies. Double-sideband and single-sideband modulation schemes with suitable modulation frequency are demonstrated under 10-km-class optical fiber network configuration.
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Millimeter-wave electro-optic modulator using stacked patch-antennas embedded with micrometer-gap for radio-over-fiber system 査読あり
Hiroshi Murata, Hironori Aya, Toshiyuki Inoue, Atsushi Sanada, Yusuf Nur Wijayanto, Atsushi Kanno, Tetsuya Kawanishi
European Microwave Week 2017: "A Prime Year for a Prime Event", EuMW 2017 - Conference Proceedings; 47th European Microwave Conference, EuMC 2017 2017-January 628 - 631 2017年12月
掲載種別：研究論文（国際会議プロシーディングス）
© 2017 European Microwave Association. We propose a new wireless electro-optic (EO) modulator using multi-layered stacked patch-antennas with a narrow gap for radio-over-fiber systems. This device uses a structure of vertically stacked patch antennas like the Yagi-Uda antenna, with an EO crystal and a low-dielectric-constant material hybrid substrate. The electric field for optical modulation and the patch length are increased by using the multi-layered antenna stacked structure. Therefore, the conversion efficiency from wireless to optical signals can be improved. In the analysis by use of HFSS, the operational frequency was shifted to the higher region by 7 GHz, and the modulation efficiency improved by 3.2 dB with the double stacking structure. In the experiments, the improvement of the modulation efficiency by 3.0 dB was verified, and the measured frequency response and directivity were in good agreement with the designed ones. The conversion of wireless 60 GHz band signals with QPSK modulation and the transfer of the converted signal over 1 km long fiber were also demonstrated.
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Instantaneous freuqnecy measurement for broadband radio signals using optical single sideband modulation 査読あり
Tetsuya Kawanishi, Hideki Hayashi, Keizo Inagaki, Atsushi Kanno, Naokatsu Yamamoto
2017 International Symposium on Antennas and Propagation, ISAP 2017 2017- 1 - 2 2017年12月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：Institute of Electrical and Electronics Engineers Inc.
By using optical single sideband modulation, we demonstrated instantaneous frequency measurement, which would be useful to monitor wideband radio signals with agile frequency change.
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Wavelength-switchable if over fiber network under ultra-dense WDM configuration for high-speed railway systems 査読あり
Atsushi Kanno, Pham Tien Dat, Naokatsu Yamamoto, Tetsuya Kawanishi
30th Annual Conference of the IEEE Photonics Society, IPC 2017 2017- 591 - 592 2017年11月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：Institute of Electrical and Electronics Engineers Inc.
Ultra-dense wavelength-division-multiplexing-based intermediate frequency over fiber system based on single-sideband suppressed carrier modulation at 15 GHz is demon- strated with a fast wavelength-tunable laser for tracking the train cars in high-speed train sys- tems by switching the wavelengths.
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110 GHz zero-bias based UTC-PD for radio-over-fiber transmission through multicore fiber 査読あり
Toshimasa Umezawa, Pham Tien Dat, Atsushi Kanno, Naokatsu Yamamoto, Tetsuya Kawanishi
30th Annual Conference of the IEEE Photonics Society, IPC 2017 2017- 97 - 98 2017年11月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：Institute of Electrical and Electronics Engineers Inc.
We developed a zero-bias operational UTC-PD, which exhibited wide bandwidth over 110 GHz. The photoreceiver was demonstrated for high-data-rate (12 Gbps, OFDM, 16-QAM) radio-over-fiber transmission through multicore fiber. BER ≦ 1×10-3 without crosstalk from outer cores could be confirmed.
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High gain antenna characteristics for 300 GHz band fixed wireless communication systems 査読あり
H. Sawada, A. Kanno, N. Yamamoto, K. Fujii, A. Kasamatsu, K. Ishizu, F. Kojima, H. Ogawa, I. Hosako
Progress in Electromagnetics Research Symposium 2017- 1409 - 1412 2017年11月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：Electromagnetics Academy
To realize the terahertz fixed wireless communication links, a high gain antenna is required to compensate the large path loss of high frequency band. In this paper, high gain antennas of horn, cassegrain and off-set parabolic types are developed, and these antenna radiation patterns are measured at 300 GHz. The measured patterns are compared with the mathematical models of lower frequency band, and it is found that they have good agreements. This study of high gain antennas can contribute to a link budget design and interference evaluation of terahertz wireless communication systems.
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Wavelength-switchable if over fiber network under ultra-dense WDM configuration for high-speed railway systems 査読あり
Atsushi Kanno, Pham Tien Dat, Naokatsu Yamamoto, Tetsuya Kawanishi
30th Annual Conference of the IEEE Photonics Society, IPC 2017 2017- 591 - 592 2017年11月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：Institute of Electrical and Electronics Engineers Inc.
Ultra-dense wavelength-division-multiplexing-based intermediate frequency over fiber system based on single-sideband suppressed carrier modulation at 15 GHz is demon- strated with a fast wavelength-tunable laser for tracking the train cars in high-speed train sys- tems by switching the wavelengths.
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Modulator bias optimization of a high extinction-ratio optical Mach-Zehnder intensity modulator for linear-cell radar systems 査読あり
Atsushi Kanno, Naokatsu Yamamoto, Tetsuya Kawanishi
Progress in Electromagnetics Research Symposium 2017- 1166 - 1171 2017年11月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：Electromagnetics Academy
We propose a bias operation method with high stability using a high extinction-ratio optical modulator. Even in the high extinction-ratio optical modulator, there is instability of the bias fluctuation under a null-point bias operation, in general. We set the bias point at a slope for improvement of tracking performance without significant spurious emissions. When the bias voltage is changed in operation by bias drifts of the modulator, slope-set bias operation can easily provide direction of the voltage change, and finally, can realize quick restoration of the bias condition without unwanted bias changes. Numerical and experimental analyses are discussed in the study with a discussion of nonlinear distortion effect at bias conditions.
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Advanced photonics technology for 1-THz wireless communication 査読あり
Atsushi Kanno
2017 Opto-Electronics and Communications Conference, OECC 2017 and Photonics Global Conference, PGC 2017 2017- 1 - 2 2017年11月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：Institute of Electrical and Electronics Engineers Inc.
Advanced photonics technology, particularly an optical frequency comb signal generation based on an optical modulation technique, is demonstrated to generate a terahertz-wave signal at a frequency of 1 THz. Frequency stability and phase noise characteristics are also evaluated for application to a wireless communication system.
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Precise Optical Modulation Using Extinction-Ratio and Chirp Tunable Single-Drive Mach-Zehnder Modulator 査読あり
Yuya Yamaguchi, Atsushi Kanno, Tetsuya Kawanishi, Masayuki Izutsu, Hirochika Nakajima
JOURNAL OF LIGHTWAVE TECHNOLOGY 35 ( 21 ) 4781 - 4788 2017年11月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
We analyzed the complex transfer function and modulation spectrum of the Mach-Zehnder (MZ) modulator with optical power and phase change imbalances. From the calculations, we found that the characteristic operation can be obtained in three cases: high extinction ratio, zero-chirp, and straight-line trajectory in the IQ plane. However, the results also indicate that we cannot achieve an operation equivalent to that of the ideal modulator, due to the small parasitic chirp in a single-drive modulator. To control the extinction ratio and chirp parameter individually, we propose an integrated modulator with some tunable Y-branches. By using the optical-power-imbalance tunable modulators, we experimentally demonstrate the characteristic operations and obtain the modulation spectrum equivalent to the ideal MZ modulator. However, compared to the ideal amplitude modulator, MZ modulators exhibit an intrinsic nonlinearity in the sinusoidal response. Therefore, we used a third-order nonlinearity compensation method using the superposition of electrical third-order harmonics. The measured spectrum consisted of only first-order modulation sidebands, which is equivalent to the ideal double-sideband suppressed-carrier modulation.
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Radio-over-fiber based IEEE802.11ad packet transmission in 90 GHz band 査読あり
Kohei Fujiwara, Atsushi Kanno
International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz 2017年10月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE Computer Society
We demonstrate IEEE802.11ad compliant packet transmission in the W-band using a radio over fiber technology with a single side-band optical modulation.
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80-GHz signal detection in high speed UTC-PD using EO sampling THz probe 査読あり
Toshimasa Umezawa, Isao Morohashi, Yoh Ogawa, Kouichi Akahane, Atsushi Matsumoto, Atsushi Kanno, Norohiko Sekine, Naokatsu Yamamoto, Iwao Hosako, Tetsuya Kawanishi
International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz 2017年10月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE Computer Society
The W-band signal near the antenna surface is detected using a THz probing system, by assuming near/far electric field distribution measurement on a phased array antenna coupled to an RoF radar system. By using 10 GHz + 12.5 kHz optical sampling pulse with a ZnTe EO probing head, the 80-GHz signal generated by a UTC-PD could be successfully detected as a down-converted signal of 100 kHz. It suggests a potential to measure the electric field distributions of 1-D/2-D patch antenna arrays, used in advanced RoF systems.
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Mode separation control of few-mode quantum dot lasers by using a multistep etalon filter 査読あり
Kouichi Akahane, Masaki Inui, Ryuji Sakamoto, Shingo Nakane, Masaru Iwao, Toshimasa Umezawa, Atsushi Matsumoto, Atsushi Kanno, Naokatsu Yamamoto, Tetsuya Kawanishi, Hideyuki Sotobayashi
International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz 2017年10月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE Computer Society
Semiconductor quantum dots can be used for an optical gain-chip in an external cavity to construct a stable two- or few-mode laser. In this study, we demonstrate wide-range mode separation control of a few-mode laser by using a multistep etalon filter. Since the precise control of multistep thickness in one etalon plate was achieved, the frequency separation of the few-mode laser can be changed by choosing the etalon position. We can change the frequency separation from 83 to 104 GHz by using this method.
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100-GHz integrated photoreceiver using optical-to-radio converter and enhancement mode PHEMT amplifier driven by photonic power supply 査読あり
Toshimasa Umezawa, Eiichi Hase, Atsushi Kanno, Atsushi Matsumoto, Kouichi Akahane, Naokatsu Yamamoto, Tetsuya Kawanishi
IEEE MTT-S International Microwave Symposium Digest 1865 - 1868 2017年10月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：Institute of Electrical and Electronics Engineers Inc.
We present a 100-GHz integrated photoreceiver using an optical-to-radio converter and an enhancement-mode PHEMT amplifier driven by all optical resources without an external electric power supply. Technology for the simultaneous generation of radio and power was developed using a zero-bias operational uni-travelling carrier (UTC) high-speed photodetector. To improve the optical-to-electrical conversion efficiency, a 110-GHz enhancement-mode InP-PHEMT amplifier was also newly developed, which operates using an internal electric power supply in an optical-to-radio converter. Using a hybrid integration based on all optical resources, a +5.5 dBm RF output at 97 GHz was successfully achieved through the optical-to-radio conversion process. Herein, the two key devices and the integrated photoreceiver are discussed.
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Concept of sensor over fibres and its application to high resolution millimetre-wave radar 査読あり
Tetsuya Kawanishi, Atsushi Kanno, Naokatsu Yamamoto
International Conference on Transparent Optical Networks 2017年09月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE Computer Society
This paper describes the concept of sensor over fibres (SoF), consisting of many sensor heads connected by fibre networks. SoF transfer waveforms from the sensor heads and performs joint signal processing to achieve high-resolution and agile imaging, while wireless sensor networks are digital networks to collect measured data at small sensors. SoF can compile information from sensor heads coherently at central signal processing units. We will also show applications of SoF technologies, such as high resolution millimetre-wave radar for airport runway surveillance.
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Millimeter- and terahertz-wave radio-over-fiber for 5G and beyond 査読あり
Pham Tien Dat, Atsushi Kanno, Toshimasa Umezawa, Naokatsu Yamamoto, Tetsuya Kawanishi
Summer Topicals Meeting Series, SUM 2017 165 - 166 2017年08月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：Institute of Electrical and Electronics Engineers Inc.
This paper reviews our recent research activities on seamless fiber-wireless systems for future mobile networks, including: radio-on-radio-over-fiber
signal processing-aided multiple signal transmission
high-capacity seamless system
and simultaneous power- and radio-over-fiber. -
Optical fiber network-connected distributed mm-wave radar system
Tetsuya Kawanishi, Atsushi Kanno, Naokatsu Yamamoto, Naruto Yonemoto, Nobuhiko Shibagaki, Ken Ichi Kashima
Summer Topicals Meeting Series, SUM 2017 197 - 198 2017年08月
掲載種別：研究論文（国際会議プロシーディングス）
This presentation reviews radar systems with many antenna units connected by optical networks, which distribute waveforms of wideband frequency modulated millimeter-wave signals, where the range resolution can be a few centimeters.
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Optically driven terahertz wave modulator using ring-shaped microstripline with GaInAs photoconductive mesa structure 査読あり
Satoshi Yamasaki, Akio Yasui, Tomohiro Amemiya, Kentaro Furusawa, Shinsuke Hara, Issei Watanabe, Atsushi Kanno, Norihiko Sekine, Zhichen Gu, Nobuhiko Nishiyama, Akifumi Kasamatsu, Shigehisa Arai
IEEE Journal of Selected Topics in Quantum Electronics 23 ( 4 ) 2017年07月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Institute of Electrical and Electronics Engineers Inc.
To improve wireless communications systems, it is desirable to seamlessly combine fiber-based optical and terahertz wireless communications systems. In this paper, we demonstrate a waveguide optically driven terahertz wave modulator using a ring-shaped microstripline with a GaInAs photoconductive mesa structure. In this device, terahertz wave modulation is performed by controlling the photo-generated carriers in the GaInAs mesa. As a result, a maximum extinction ratio of 16.8 dB in the terahertz band was obtained with a light irradiation of 15 dBm (32 mW), and the 3 dB modulation bandwidth was approximately 170 MHz.
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30-GHz OFDM radar and wireless communication experiment using radio over fiber technology 査読あり
Toshimasa Umezawa, Kunihisa Jitsuno, Atsushi Kanno, Naokatsu Yamamoto, Tetsuya Kawanishi
Progress in Electromagnetics Research Symposium 3098 - 3101 2017年05月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：Electromagnetics Academy
We present both OFDM radar and wireless communication experiments with 30-GHz RoF technology using the same experimental set-up. Two of key technologies of a newly developed 30-GHz wideband photoreceiver module and digital pre-distortion techniques allow a high space resolution with high signal-to-noise ratios. From the wireless communication experiment, 14.5-Gbps high data rate up to a distance of 10-m is achieved with a 1×10- 3 bit error rate using single carrier signal, which can be easily switched to a multi-carrier signal system, such as orthogonal frequency-division multiplexing (OFDM). In the OFDM radar experiment (10.1 GHz bandwidth, 1683 subcarriers) including low crest factor OFDM reference signal, highly reflected signals from “known refractors” located at a 5-m distance could be clearly detected.
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100-GHz Fiber-Fed Optical-to-Radio Converter for Radio- and Power-Over-Fiber Transmission 査読あり
Toshimasa Umezawa, Kenichi Kashima, Atsushi Kanno, Atsushi Matsumoto, Kouichi Akahane, Naokatsu Yamamoto, Tetsuya Kawanishi
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS 23 ( 3 ) 2017年05月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
We have developed a 100-GHz fiber-fed optical-to-radio converter for radio-and power-over-fiber transmission. A zero-bias operational high-speed photodetector (3-dB bandwidth >100 GHz) could be applied for the optical-to-radio converter, taking significant advantage of no-bias feed 100-GHz operation. We have successfully demonstrated simultaneous radio and power generation from one device through a bias-T circuit. A 100-GHz pseudomorphic high electron mobility transistor amplifier allowed a hybrid integrated photoreceiver to enhance the O/E conversion gain. Using the generated electric power, a gate bias in the 100-GHz amplifier was driven. The performance of each device and the integrated photoreceiver is described. High data rate photonic wireless transmission based on photonic power supply without external electric power supply is demonstrated.
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Dynamic characteristics of 20-layer stacked QD-SOA with strain compensation technique by ultrafast signals using optical frequency comb 査読あり
Atsushi Matsumoto, Kouich Akahane, Takahide Sakamoto, Toshimasa Umezawa, Atsushi Kanno, Naokatsu Yamamoto
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE 214 ( 3 ) 2017年03月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：WILEY-V C H VERLAG GMBH
In this article, we evaluated the static and dynamic characteristics of 20-layer stacked quantum dot semiconductor optical amplifiers (QD-SOAs) grown on an InP(311)B substrate with a strain compensation technique by ultrafast signals using an optical frequency comb. The gain peak wavelength of the fabricated QD-SOA was 1520nm, and a maximum gain of approximately 15.8dB was obtained when the injection current was 350mA. By using optical bit rate multiplier modules, an optical pulse, which was generated by the use of the optical frequency comb, was multiplexed. We observed the dynamic behavior of the QD-SOA with the pulse trains. The minimum interval between pulses was 4.2ps, and we measured using an optical sampling oscilloscope. It was found the QD-SOA could respond to ultrafast pulses that were equivalent to the signals of 220Gbs(-1) class speed without any large pattern distortions. In addition, we could obtain a rather clear optical pulse waveform. We also estimated the gain recovery time of the QD-SOA to be 6.0ps by using a pump probe-like method. One of the reasons that the fabricated QD-SOA could respond to ultrafast signals was its ultrashort gain recovery time.
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Wide Frequency Range Optical Synthesizer With High-Frequency Resolution 査読あり
Hitoshi Kiuchi, Tetsuya Kawanishi, Atsushi Kanno
IEEE PHOTONICS TECHNOLOGY LETTERS 29 ( 1 ) 78 - 81 2017年01月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
The generation of high-frequency signals including those in the terahertz region has become indispensable in state-of-the-art communication systems. A synthesizer as a measurement device generates signals of desired frequencies with high-frequency resolution. Electric signals (microwaves or millimeter waves) can be generated by a photomixer performing optical-electrical energy conversion based on the phase difference between two coherent optical signals. Recently, the frequency bandwidth for photomixers has reached the terahertz region and photomixers are now more readily available. The main purpose of this letter is to provide an optical synthesizer with a high-frequency resolution (better than 1 Hz) and with seamless frequency coverage from the microwave to the terahertz-wave regions using one apparatus. The system is designed in such a way that the mean of the resolution frequency includes the frequency instability of the generated signal.
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100 GHz optical-to-radio converter module and its application in radio and power over fiber transmission through multi-core fiber 査読あり
T. Umezawa, P. T. Dat, E. Hase, K. Kashima, A. Kanno, K. Akahane, A. Mstsumoto, N. Yamamoto, T. Kawanishi
2017 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXHIBITION (OFC) 2017年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
We developed a 100 GHz optical-to-radio converter module integrated with a 100 GHz amplifier, which was applied in radio (12-Gbps, OFDM, 16-QAM. IF = 92-GHz) and power over fiber transmission through a multi-core fiber.
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Simultaneous Transmission of Multi-RATs and Mobile Fronthaul in the MMW Bands over an IFoF System 査読あり
Pham Tien Dat, Atsushi Kanno, Naokatsu Yamamoto, Tetsuya Kawanishi
2017 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXHIBITION (OFC) 2017年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
We propose and demonstrate a simultaneous transmission of LTE-A, 25-GHz OFDM/FBMC radio access, and 96-GHz filtered-OFDM mobile fronthaul signals over a simple and low cost intermediate-frequency-over-fiber system. We confirm the successful transmission of all signals.
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On the Impact of Tomlinson-Harashima Precoding in Optical PAM Transmissions for Intra-DCN Communication 査読あり
Kengo Matsumoto, Yuki Yoshida, Akihiro Maruta, Atsushi Kanno, Naokatsu Yamamoto, Ken-ichi Kitayama
2017 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXHIBITION (OFC) 2017年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
Anti-chromatic dispersion capability of the Tomlinson-Harashima precoding in optical PAM transmissions is investigated analytically and experimentally. The use of THP enables nearly two orders of magnitude BER performance improvement in a 30-Gbaud PAM-4 transmission over a 20-km SSMF.
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Coherent Radio-over-Few-Mode-Fiber 査読あり
Ken-ichi Kitayama, Nikolaos. P. Diamantopoulos, Yuki Yoshida, Akihiro Maruta, Atsushi Kanno, Tetsuya Kawanishi, Ryo Maruyama, Kazuhiko Aikawa, Nobuo Kuwaki
2017 CONFERENCE ON LASERS AND ELECTRO-OPTICS PACIFIC RIM (CLEO-PR) 2017年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
W-band coherent radio-over-few-mode-fiber transmission system is presented, featuring an optical/wireless converged MIMO DSP. Power fading of radio signals incurred by mode coupling-induced crosstalk and its mitigation technique by the mode assignment and filtering are studied.
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Vector Modulation Using EA Modulator 査読あり
Ukrit Mankong, Praimezt Mekbungwan, Keizo Inagaki, Atsushi Kanno, Tetsuya Kawanishi
2017 CONFERENCE ON LASERS AND ELECTRO-OPTICS PACIFIC RIM (CLEO-PR) 2017年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
We present a method to achieve vector modulation in an electroabsorption modulator with help of a directly modulated laser. We discuss the challenges involved and demonstrate the combined phase and amplitude modulation theoretically and experimentally using a commercial electroabsorption modulator integrated laser.
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Radio Over Fiber Signal Generation and Distribution and Its Application to Train Communication Network 査読あり
Atsushi Kanno, Pham Tien Dat, Naokatsu Yamamoto, Tetsuya Kawanishi, Naruto Yonemoto, Vo Nguyen Quoc Bao, Tan Hanh, Le Quoc Cuong, Kenichi Kashima, Nobuhiko Shibagaki
2017 CONFERENCE ON LASERS AND ELECTRO-OPTICS PACIFIC RIM (CLEO-PR) 2017年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
Radio over fiber signal generation by an ultra-fast wavelength-tunable laser under wavelength-division-multiplexing configuration is demonstrated for radio signal delivery to remote sites in a linear-cell-based distributed antenna system. Application to linear-cell train communication system is discussed.
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光導波路型表面弾性波オプトメカニクス系の構築
岡田 彪利, 山口 祐也, 山崎 歴舟, 野口 篤史, 田渕 豊, 菅野 敦史, 山本 直克, 宇佐見 康二, 中村 泰信
日本物理学会講演概要集 72 436 - 436 2017年
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High bitrate mm-wave links using RoF technologies and its non-telecom application 査読あり
Atsushi Kanno
Optics InfoBase Conference Papers 2017 2017年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：OSA - The Optical Society
Millimeter-wave RoF technology is discussed for application to high bitrate wireless communication in fiber-wireless bridge configuration and railway communication systems. Non-telecommunication application such as a millimeter-wave radar system is also shown in the paper.
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Coexistence and Transmission of Multiple Radios over Seamless Fiber-Wireless Systems 査読あり
Pham Tien Dat, Atsushi Kanno, Naokatsu Yamamoto, Tetsuya Kawanishi
BROADBAND ACCESS COMMUNICATION TECHNOLOGIES XI 10128 2017年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：SPIE-INT SOC OPTICAL ENGINEERING
In this paper, we present efficient solutions for simultaneous transmission of multiple radio signals over seamless fiber wireless systems, including radio signals in legacy microwave bands and in high frequency bands. At central stations, radio signals can be mapped onto the same optical transport channel using data mapping algorithms and/or subcarrier multiplexing technique. After the fiber transmission, the received signals can be down-converted, digitized, and de-mapped to recover the originally transmitted signals. We present and compare two different methods, including a radio-over-fiber system and optical up-conversion at remote sites and an intermediate-frequency-over-fiber system and an electrical up-conversion at remote sites. We experimentally confirm the suitability of both the transmission methods, and achieve satisfactory performance for all signals, including LTE-advanced, orthogonal frequency-division multiplexing, and filtered-orthogonal frequency-division multiplexing signals. In particular, the latter method can provide a high optical spectral efficiency and low fiber dispersion effect and is suitable for ultra-dense small cell deployment in future mobile networks.
DOI： 10.1117/12.2251254
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10-GHz 32-pixel 2-D photodetector array for advanced optical fiber communications 査読あり
Toshimasa Umezawa, Takahide Sakamoto, Kouichi Akahane, Atsushi Matsumoto, Atsushi Kanno, Naokatsu Yamamoto, Tetsuya Kawanishi
Optics InfoBase Conference Papers 2017 2017年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：OSA - The Optical Society
We studied a 10-GHz 32-pixel two-dimensional photodetector array for advanced optical fiber communications and LIDAR applications. Electromagnetic field simulation revealed the RF crosstalk problem between pixels. A fabricated high-speed photodetector array will be discussed.
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Radio over fiber-based radio relay link for indoor and in-car applications towards 5G/IoT era 査読あり
Atsushi Kanno, Naokatsu Yamamoto, Tetsuya Kawanishi
Optics InfoBase Conference Papers 2017 2017年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：OSA - The Optical Society
Radio over single-mode, multimode, and plastic optical fiber links are demon-strated as a radio relay link for improvement of coverage areas. These techniques are capable for different deployment scenarios in several indoor conditions.
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High responsivity 100 GHz waveguide UTC photodetector 査読あり
T. Umezawa, K. Akahane, A. Matsumoto, A. Kanno, N. Yamamoto, T. Kawanishi
BROADBAND ACCESS COMMUNICATION TECHNOLOGIES XI 10128 2017年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：SPIE-INT SOC OPTICAL ENGINEERING
We present a double cladding, high-mesa-type waveguide UTC photodetector with an improved the responsivity. In this device structure, an InGaAs thin core layer was sandwiched by p-InP/InGaAsP and n-InP/InGaAsP cladding layers, including a UTC structure, in order to obtain a good optical coupling between the waveguide and the fiber. By comparing the resulting mode field with that obtained with a single cladding layer structure, we confirmed that the vertical mode field was enlarged. Without a spot size converter, the measured responsivity was as high as 0.6 A/W at 1550 nm, which suggests a responsivity three times higher than that of back-illuminated structures, and higher responsivity than that of previous reports. A high frequency performance (f(3dB) = 100 GHz) was also measured. The device structure, including the layer, doping level conditions, and optical fiber coupling results are discussed, and its performance is characterized in detail.
DOI： 10.1117/12.2250246
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光導波路型表面弾性波オプトメカニクス系の構築
岡田 彪利, 山口 祐也, 山崎 歴舟, 野口 篤史, 田渕 豊, 菅野 敦史, 山本 直克, 宇佐見 康二, 中村 泰信
日本物理学会講演概要集 72 436 - 436 2017年
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Radio over fiber-based radio relay link for indoor and in-car applications towards 5G/IoT era 査読あり
Atsushi Kanno, Naokatsu Yamamoto, Tetsuya Kawanishi
Optics InfoBase Conference Papers 2017 2017年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：OSA - The Optical Society
Radio over single-mode, multimode, and plastic optical fiber links are demon-strated as a radio relay link for improvement of coverage areas. These techniques are capable for different deployment scenarios in several indoor conditions.
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Optical-fiber-connected 300-GHz FM-CW radar system 査読あり
Atsushi Kanno, Norihiko Sekine, Akifumi Kasamatsu, Naokatsu Yamamoto, Tetsuya Kawanishi
Proceedings of SPIE - The International Society for Optical Engineering 10189 2017年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：SPIE
300-GHz frequency-modulated continuous-wave (FM-CW) radar system operated by radio over fiber technologies is configured and demonstrated. Centralized signal generator, which is based on an optical frequency comb generation, provides high-precise FM-CW radar signal. The optical signal is easy to be transported to radar heads through an optical fiber network. Optical-modulator-based optical frequency comb generator is utilized as an optical frequency multiplier from a microwave signal to a 300-GHz terahertz signal by an optical modulation technique. In the study, we discuss the configuration of the network, signal generator and remote radar head for terahertz-wave multi-static radar system.
DOI： 10.1117/12.2262505
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Millimeter- and Terahertz-Wave Over Fiber Technologies for High-Speed Communications and Non-Telecom Applications 査読あり
Atsushi Kanno
BROADBAND ACCESS COMMUNICATION TECHNOLOGIES XI 10128 2017年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：SPIE-INT SOC OPTICAL ENGINEERING
Millimeter-wave and terahertz-wave technologies are promising solutions for high-speed wireless communication as well as nondestructive imaging due to its high frequency (short wavelength) nature. In the study, we propose and demonstrate high-speed wireless communication in millimeter- and terahertz-wave bands adopted by advanced optical fiber communication technologies: combination of a radio over fiber (RoF) manner for generation of the signals and a high-speed digital signal processing implemented in a receiver. The RoF technique is also capable for a local-oscillator signal transport over the fiber to the remote sites. Fiber-remoted distributed radar system is also discussed in the paper.
DOI： 10.1117/12.2250092
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High-voltage optical power delivery using a light-wave-modulation method 査読あり
Naokatsu Yamamoto, Toshimasa Umezawa, Atsushi Matsumoto, Kouichi Akahane, Atsushi Kanno, Atsushi Kobayashi, Hiroshi Takai
BROADBAND ACCESS COMMUNICATION TECHNOLOGIES XI 10128 2017年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：SPIE-INT SOC OPTICAL ENGINEERING
Optical power-delivery systems are applied to distribute electrical power over optical fibers for systems such as remote wireless radio heads. Typically, the electrical voltage at the receiver side is low, around 1.0 V, owing to the use of a long-wavelength carrier. Consequently, we recently proposed a light-wave-modulation method for increasing the received electrical voltage. A 940-nm high-power laser was directly modulated to form a modulated light wave. We also used a small inductor to generate an induced electromotive force from the modulated light wave. We successfully obtained a peak voltage over 18 V using this simple technique.
DOI： 10.1117/12.2250819
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90 Gb/s hybrid integrated photoreceiver module with high speed 1.5 μm-band QD-SOA
A. Matsumoto, T. Umezawa, K. Akahane, A. Kanno, N. Yamamoto, T. Kawanishi
Conference Digest - IEEE International Semiconductor Laser Conference 2016年12月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：Institute of Electrical and Electronics Engineers Inc.
We investigated fundamental characteristics of a hybrid integrated photoreceiver module with a 1.5 μm-band quantum dot semiconductor optical amplifier (QD-SOA) and conventional pin-photodiode (pin-PD) as a first stage. The results indicated the photoreceiver integrated with a QD-SOA and QD-PD has the potential to be operated for signals over 100 Gb/s.
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Seamless Fiber-Wireless Bridge in the Millimeter- and Terahertz-Wave Bands 査読あり
Atsushi Kanno, Pham Tien Dat, Norihiko Sekine, Iwao Hosako, Naokatsu Yamamoto, Yuki Yoshida, Ken-Ichi Kitayama, Tetsuya Kawanishi
JOURNAL OF LIGHTWAVE TECHNOLOGY 34 ( 20 ) 4794 - 4801 2016年10月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Fiber-wireless transmission in the terahertz-wave band as well as in the millimeter-wave band is the key for a seamless integration of radio and optical networks in a physical layer. Advanced optical fiber communication technology enables a high precision direct waveform transfer between optical and radio domains. For realization of a seamless conversion, an optical-terahertz converter is configured with optical heterodyning for an optical-to-terahertz conversion. Analog optical modulation techniques by an input millimeter-wave signal and an intermediate frequency component after a frequency downconversion are utilized for a terahertz-to-optical conversion. A quadrature phase-shift keying signal transmission in an optical-fiber-to-radio-to-optical-fiber link (fiber-wireless bridge) is successfully demonstrated with the 90 and 300-GHz signals, simultaneously, using an optical frequency comb source. The possible transmission distance in severe weather conditions in these frequency bands is also discussed.
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5G TRANSPORT NETWORKS: THE NEED FOR NEW TECHNOLOGIES AND STANDARDS
Pham Tien Dat, Atsushi Kanno, Naokatsu Yamamoto, Tetsuya Kawanishi
IEEE COMMUNICATIONS MAGAZINE 54 ( 9 ) 18 - + 2016年09月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Mobile transport networks will play a vital role in future 5G and beyond networks. In particular, access transport networks connecting radio access with core networks are of critical importance. They will be required to support massive connectivity, super high data rates, and real-time services in a ubiquitous environment. To attain these targets, transport networks should be constructed on the basis of a variety of technologies and methods, depending on application scenarios, geographic areas, and deployment models. In this article, we present several technologies, including analog radio-over-fiber transmission, intermediate-frequency-over-fiber technology, radio-on-radio transmission, and the convergence of fiber and millimeter-wave systems, that can facilitate building such effective transport networks in many use cases. For each technology, we present the system concept, possible application cases, and demonstration results. We also discuss potential standardization and development directions so the proposed technologies can be widely used.
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Mitigation of modal crosstalk-induced power fading in mode division multiplexed W-band RoF links
N. P. Diamantopoulos, Y. Takami, Y. Yoshida, A. Maruta, A. Kanno, N. Yamamoto, T. Kawanishi, R. Maruyama, N. Kuwaki, S. Matsuo, K. Kitayama
2016 Optical Fiber Communications Conference and Exhibition, OFC 2016 2016年08月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：Institute of Electrical and Electronics Engineers Inc.
To avoid the modal crosstalk-induced power fading, a mode assignment technique has been proposed and experimentally demonstrated for mode division multiplexed W-band radio-over-fiber links.
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Transmission of multiband wireless signals over a seamless IM/DD fiber-MMW system 査読あり
Nguyen Toan Van, Pham Tien Dat, Atsushi Kanno, Naokatsu Yamamoto, Vo Nguyen Quoc Bao, Tetsuya Kawanishi
IEICE ELECTRONICS EXPRESS 13 ( 15 ) 2016年08月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG
This paper proposes a high-speed multiband filtered-orthogonal frequency division multiplexing (F-OFDM) signal transmission over a seamless fiber-millimeter-wave (MMW) system at 92.5 GHz. The system employs a frequency and phase stabilized optical MMW signal generation at the transmitter and a simple direct detection at the receiver. We confirm a successful transmission of multiband F-OFDM signal over a seamless 20-km single mode fiber (SMF) and 1-m 92.5-GHz wireless system. Compared to the single-band and multiband OFDM signal transmission, the proposed system can provide a much better performance, particularly at the edges of each band.
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Bias-Free Operational UTC-PD above 110 GHz and Its Application to High Baud Rate Fixed-Fiber Communication and W-Band Photonic Wireless Communication 査読あり
Toshimasa Umezawa, Atsushi Kanno, Kenichi Kashima, Atsushi Matsumoto, Kouichi Akahane, Naokatsu Yamamoto, Tetsuya Kawanishi
JOURNAL OF LIGHTWAVE TECHNOLOGY 34 ( 13 ) 3138 - 3147 2016年07月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
We present the design of a bias-free uni-travellingcarrier photodiode (UTC-PD) that is operational above 110 GHz, and its application to 100-GBd fixed-fiber communication and 109-GHz carrier-photonic wireless communication for advanced optical networks. The design and analysis for bias-free operation were explained in detail using the carrier concentration in the photo-absorption layer and carrier collector layer. In the experimental results, the developed UTC-PD with back-illuminated structure exhibited a wide 3-dB bandwidth of over 110 GHz at 0 V. For fixed-fiber communications, a high-baud-rate photoreceiver based on the UTC-PD was fabricated. Eye diagrams showed clear openings at up to 107 GBd and high photo-currents of 3-7 mA at 100 GHz signal light were observed at zero-bias. Assuming photonic wireless communication using photonic power supply through optical fiber, the developed UTC-PD contributed to reducing bias feeds to the photoreceiver module. Additionally, low power consumption was achieved when using the newly developed 110 GHz InP-PHEMT amplifier with the UTC-PD.
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Array of patch-antennas with meandering-gaps on optical modulator for wireless millimeter-wave beam-steering 査読あり
Yusuf Nur Wijayanto, Atsushi Kanno, Hiroshi Murata, Tetsuya Kawanishi, Naokatsu Yamamoto, Yasuyuki Okamura
INTERNATIONAL JOURNAL OF MICROWAVE AND WIRELESS TECHNOLOGIES 8 ( 4-5 ) 759 - 765 2016年06月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：CAMBRIDGE UNIV PRESS
An array of patch-antennas with meandering-gaps on an optical modulator is proposed for wireless millimeter-wave beam-steering through high-speed radio-over-fiber systems. Wireless millimeter-wave can be received by the array of patch-antennas and directly modulated to lightwave by the optical modulator. The wireless millimeter-wave can be steered using the meandering-gaps at the patch-antennas by controlling interaction between millimeter-wave and lightwave electric fields in electro-optic modulation. The basic operation and analysis of the proposed device are discussed. In the experiment, 5 x 5 antenna array in 40 GHz millimeter-wave bands was designed and realized for device characterization and demonstration to wireless millimeter-wave beam-steering. There were five variations of wireless millimeter-wave beam-steering for one-dimensional in xz- or yz-planes that can be obtained with wireless millimeter-wave steerable beams of about +/- 30 degrees. Additionally, 25 variations of wireless beam-steering can be obtained for two dimension in xyz-space through orthogonal optical modulation. The proposed device is promising to be applied in millimeter-wave/tera-hertz bands for future directional wireless communication and sensing with high-speed and high-resolution operation.
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Pump-phase-noise-free optical wavelength data exchange between QAM signals with 50-GHz channel-spacing using coherent DFB pump 査読あり
Guo-Wei Lu, Andre Albuquerque, Benjamin J. Puttnam, Takahide Sakamoto, Miguel Drummond, Rogerio Nogueira, Atsushi Kanno, Satoshi Shinada, Naoya Wada, Tetsuya Kawanishi
OPTICS EXPRESS 24 ( 4 ) 3702 - 3713 2016年02月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：OPTICAL SOC AMER
An important challenge for implementing optical signal processing functions such as wavelength conversion or wavelength data exchange (WDE) is to avoid the introduction of linear and nonlinear phase noise in the subsystem. This is particularly important for phase noise sensitive, high-order quadrature-amplitude modulation (QAM) signals. In this paper, we propose and experimentally demonstrate an optical data exchange scheme through cascaded 2nd-order nonlinearities in periodically-poled lithium niobate (PPLN) waveguides using coherent pumping. The proposed coherent pumping scheme enables noise from the coherent pumps to be cancelled out in the swapped data after WDE, even with broad linewidth distributed feedback (DFB) pump lasers. Hence, this scheme allows phase noise tolerant processing functions, enabling the low-cost implementation of WDE for high-order QAM signals. We experimentally demonstrate WDEs between 10-Gbaud 4QAM (4QAM) signal and 12.5-Gbaud 4QAM (16QAM) signal with 3.5-MHz linewidth DFB pump lasers and 50-GHz channel spacing. Error-free operation is observed for the swapped QAM signals with coherent DFB pumping whilst use of free-running DFB pumps leads to visible error floors and unrecoverable phase errors. The phase noise cancellation in the coherent pump scheme is further confirmed by study of the recovered carrier phase of the converted signals. In addition to pump phase noise, the influence of crosstalk caused by the finite extinction ratio in WDE is also experimentally investigated for the swapped QAM signals. (C) 2016 Optical Society of America
DOI： 10.1364/OE.24.003702
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Millimeter-wave antenna using metamaterial ELC resonators on electro-optics substrate 査読あり
A. A. Fathnan, Y. N. Wijayanto, P. Daud, D. Mahmudin, A. Kanno, T. Kawanishi
2015 11th Conference on Lasers and Electro-Optics Pacific Rim, CLEO-PR 2015 4 2016年01月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：Institute of Electrical and Electronics Engineers Inc.
We propose and present millimeter-wave antennas using metamaterial ELC resonators on electro-optic substrates for wireless millimeter-wave receivers and optical modulators. Analysis for the antenna characteristics of the device are discussed at millimeter-wave frequency of 100GHz.
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Full-Duplex Transmission of LTE-A Carrier Aggregation Signal Over a Bidirectional Seamless Fiber-Millimeter-Wave System 査読あり
Pham Tien Dat, Atsushi Kanno, Naokatsu Yamamoto, Tetsuya Kawanishi
JOURNAL OF LIGHTWAVE TECHNOLOGY 34 ( 2 ) 691 - 700 2016年01月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
We propose a flexible and high-performance fronthaul system for future mobile networks using a seamless combination of fiber-optic and millimeter-wave (MMW) systems. The proposed system employs a high-quality optical MMW signal generation at the transmitter and a stable and high-performance MMW self-homodyne detection at the receiver. In the downlink direction, successful transmission of intraband and interband carrier aggregation (CA) long-term evolution-advanced (LTE-A) signals over the system is experimentally confirmed. We also confirm satisfactory performance for the transmission over a fiber-wireless bridge using a cascade of the seamless system and a conventional radio-over-fiber (RoF) link. In the uplink direction, we successfully demonstrate the transmission of an intraband CA LTE-A signal over a cascade of a radio-on-radio and a RoF system. In addition, we confirm that the full-duplex transmission of LTE-A signals over the proposed bidirectional system does not experience performance degradation compared to the case with half-duplex transmission. The proposed system is a potential solution for mobile-signal transmission in future networks.
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Erratum: Performance of Uplink Packetized LTE-A Signal Transmission on a Cascaded Radio-on-Radio and Radio-over-Fiber System [IEICE Transactions on Electronics Vol. E98.C (2015) No. 8 pp. 840-848]
TIEN DAT Pham, KANNO Atsushi, KAWANISHI Tetsuya
IEICE Transactions on Electronics 99 ( 2 ) 331_e1 - 331_e1 2016年
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：一般社団法人 電子情報通信学会
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Mode-Division Multiplexing LiNbO3 Modulator Using Directional Coupler 査読あり
Yutaro Kodama, Yuya Yamaguchi, Atsushi Kanno, Tetsuya Kawanishi, Masayuki Izutsu, Hirochika Nakajima
2016 21ST OPTOELECTRONICS AND COMMUNICATIONS CONFERENCE (OECC) HELD JOINTLY WITH 2016 INTERNATIONAL CONFERENCE ON PHOTONICS IN SWITCHING (PS) 2016年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
We designed and fabricated a LiNbO3 integrated optical modulator for mode-division multiplexing, where optical signals in two modes can be independently controlled and combined together. Mode crosstalk was smaller than -20dB in C-band.
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Polarization dependence of avalanche multiplication factor in 1.5 mu m quantum dot waveguide photodetector 査読あり
T. Umezawa, K. Akahane, A. Matsumoto, A. Kanno, N. Yamamoto, T. Kawanishi
2016 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO) 2016年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
We fabricated 1.5 mu m quantum dot waveguide photodetector, and characterized the electrical and optical properties. It was found that the avalanche photocurrent strongly depends on TE/TM polarization.
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All-spectrum fiber-wireless transmission for 5G backhaul and fronthaul links 査読あり
Atsushi Kanno, Pham Tien Dat, Naokatsu Yamamoto, Iwao Hosako, Yuki Yoshida, Ken-ichi Kitayama, Tetsuya Kawanishi
2016 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXHIBITION (OFC) 2016年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
This paper presents the simultaneous transmission of millimeter-wave and terahertz-wave radio signals over an optical fiber and air by a single optical frequency comb source with several types of receiver configurations. (C) 2015 Optical Society of America
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Phase noise characteristics of optical frequency comb-based 1-THz transmitter 査読あり
Atsushi Kanno, Norihiko Sekine, Akifumi Kasamatsu, Naokatsu Yamamoto, Tetsuya Kawanishi
2016 IEEE INTERNATIONAL TOPICAL MEETING ON MICROWAVE PHOTONICS (MWP) 247 - 250 2016年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
1.026-THz signal generated by an optical frequency comb generator is evaluated on its phase noise characteristics. A multi-level signal transmission by a photonics-based 1-THz radio transmitter is also evaluated with QPSK and 16QAM signals designed for uplink in the LTE mobile communications.
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On the Channel Capacity of Polarization-Multiplexed Coherent Radio-over-Fiber Transmissions at Millimeter-wave Bands 査読あり
Y. Yoshida, Y. Takami, S. Inudo, K. Kitayama, A. Kanno, N. Yamamoto, T. Kawanishi
2016 IEEE INTERNATIONAL CONFERENCE ON COMMUNICATIONS (ICC) 2016年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
A closed-form capacity expression for polarization-multiplexed coherent MIMO radio-over-fiber (RoF) links at millimeter-wave bands is derived and the impact of the fiber's polarization rotation and the wireless antenna misalignment on the MIMO channel capacity is revealed. The analytical results are validated via an indoor W-band (75-110 GHz) 10-Gbaud MIMO-RoF transmission experiment.
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Radio-over-Fibre Based High-Speed Millimetre-Wave Backhaul System for High-Speed Trains 査読あり
Tetsuya Kawanishi, Atsushi Kanno, Pham Tien Dat, Naokatsu Yamamoto
2016 18TH INTERNATIONAL CONFERENCE ON TRANSPARENT OPTICAL NETWORKS (ICTON) 2016年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
This paper reviews train communication networks (TCNs) based on radio-over-fibre (RoF) technology. TCNs connect base stations (BSs) in trains to world wide networks through trackside links consisting of optical fibres and many radio access units (RAUs). Waveform for radio communications can be effectively delivered to each RAU by RoF. The TCN can be controlled by train location information to reduce overhead due to hand-over in mobile communication systems.
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Digital Coherent Transmitter Using Electroabsorption Modulator Integrated Laser 査読あり
Praimezt Mekbungwan, Ukrit Mankong, Keizo Inagaki, Atsushi Kanno, Tetsuya Kawanishi
2016 IEEE INTERNATIONAL TOPICAL MEETING ON MICROWAVE PHOTONICS (MWP) 173 - 176 2016年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
We investigate the feasibility of an electroabsorption modulator integrated laser as a digital coherent transmitter. The laser and EAM sections are used as phase and amplitude modulators respectively. We discuss the challenges involved and demonstrate the combined phase and amplitude modulation on a commercial device.
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Efficient Mobile Fronthaul for Simultaneous Transmission of 4G and Future Mobile Signals 査読あり
Pham Tien Dat, Atsushi Kanno, Naokatsu Yamamoto, Tetsuya Kawanishi
2016 21ST OPTOELECTRONICS AND COMMUNICATIONS CONFERENCE (OECC) HELD JOINTLY WITH 2016 INTERNATIONAL CONFERENCE ON PHOTONICS IN SWITCHING (PS) 2016年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
We present an efficient mobile fronthaul system for co-transmission of radio signals in the microwave and millimeter-wave bands. We successfully transmit a WLAN and an LTE-A signal at 2.6 GHz and 33.6 GHz, respectively, over the system.
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High-conversion-gain 100-GHz photoreceiver integrated with UTC-PD and PHI-NIT amplifier for 92-GHz carrier, 10.7-Gbps photonic wireless communication 査読あり
T. Umezawa, K. Kashima, A. Kanno, P. T. Dat, K. Akahane, A. Matsumoto, N. Yamamoto, T. Kawanishi
2016 46TH EUROPEAN MICROWAVE CONFERENCE (EUMC) 1397 - 1400 2016年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
We successfully designed and fabricated a high conversion-gain 100-GHL photoreceiver integrated with a UTC-PD and a PHEMT amplifier for 92-GHz carrier photonic wireless communication. Then, in a demonstration of 92-GHz carrier, OFDM, 16-QAM photonic wireless communication, we confirmed that high data rate of 11.03-Gbps (hit error rate of 1 X 10(-3)) could be achieved at a low optical input power, without post amplifiers for the photoreceiver. The designs and the results are discussed.
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31-GHz single-carrier, 44.6-Gbps photonic wireless transmission using a wide-bandwidth high power photodetector and a pre-distortion technique 査読あり
T. Umezawa, K. Jitsuno, N. Shibagaki, A. Kanno, K. Akahane, A. Mstsumoto, N. Yamamoto, T. Kawanishi
2016 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXHIBITION (OFC) 2016年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
Single-carrier photonic wireless transmission at 31 GHz and 8.0 Gbaud with 64QAM is successfully achieved with error-free operation. A newly developed wide bandwidth high power photodetector and a pre-equalizing subsystem are presented.
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Development Activity of Terahertz Amplifiers with FWG-TWTs 査読あり
Mitsuru Yoshida, Junichi Kobayashi, Yusuke Fujishita, Norio Masuda, Norihiko Sekine, Atsushi Kanno, Naokatsu Yamamoto, Akifumi Kasamatsu, Iwao Hosako
2016 IEEE INTERNATIONAL VACUUM ELECTRONICS CONFERENCE (IVEC) 2016年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
There is a region called "Terahertz Gap" between the highest frequency of microwave technology and the lowest frequency of photonic technology. At this region, the device development has been one of major issues on R&D. Recently, vacuum electronics devices, especially as high power RF sources, hold the potential for innovational progress in various applications. We report the development activity of terahertz amplifiers with folded waveguide traveling wave tube (TWT) in this region.
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Frequency-chirped multi-cycled terahertz pulse generated from periodically poled lithium niobate for frequencymodulated continuous-wave radars 査読あり
Junichi Hamazaki, Yoh Ogawa, Norihiko Sekine, Akifumi Kasamatsu, Atsushi Kanno, Naokatsu Yamamoto, Iwao Hosako
2016 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO) 2016年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
Broadband down-and up-chirped THz pulses are generated from PPLNs. Their temporal frequency shift and temporal amplitude are demonstrated. In the case of the down-chirped THz pulse, square-shaped waveform with broadband frequency shift is observed.
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Simultaneous Transmission of 4G LTE-A and Wideband MMW OFDM Signals over Fiber Links 査読あり
Pham Tien Dat, Atsushi Kanno, Naokatsu Yamamoto, Tetsuya Kawanishi
2016 IEEE INTERNATIONAL TOPICAL MEETING ON MICROWAVE PHOTONICS (MWP) 87 - 90 2016年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
We present efficient mobile fronthaul systems for simultaneous transmission of radio signals in the microwave and millimeter-wave hands over fiber links. We compare the performance for signal transmission over intermediate frequency over fiber systems using an electrical and optical up-conversion to the MEW hand at remote sites. We experimentally confirm the successful transmission of an LTE-A signal at 2.6 GHz and a wideband OFDM signal at 35.4 GHz over the systems.
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Measurement of Vectorial Response of IQ Modulator Using Optical Interference 査読あり
Yuya Yamaguchi, Kazuki Seki, Naoki Takahashi, Atsushi Kanno, Tetsuya Kawanishi, Masayuki Izutsu, Hirochika Nakajima
2016 21ST OPTOELECTRONICS AND COMMUNICATIONS CONFERENCE (OECC) HELD JOINTLY WITH 2016 INTERNATIONAL CONFERENCE ON PHOTONICS IN SWITCHING (PS) 2016年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
We propose a new measurement method of modulator response in phasor domain for Mach-Zehnder modulators embedded in IQ modulator using simple equipments. The modulation curve with extinction ratio of 14.7 and 22 dB were measured.
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10-Gbaud QPSK Signal Simultaneous Transmission in the T and C bands for Ultra-Broadband Photonic Transport System 査読あり
Akihiro Murano, Shoko Yamada, Atsushi Kanno, Naokatsu Yamamoto, Hideyuki Sotobayashi
2016 21ST OPTOELECTRONICS AND COMMUNICATIONS CONFERENCE (OECC) HELD JOINTLY WITH 2016 INTERNATIONAL CONFERENCE ON PHOTONICS IN SWITCHING (PS) 2016年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
We successfully demonstrate 10-Gbaud QPSK simultaneous transmission in the T and C bands. Observed bit error rates are within a forward error correction limit of 2 x 10(-3) under homodyne coherent detection configuration.
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11-Gbps 16-QAM OFDM Radio over Fiber Demonstration using 100 GHz High-Efficiency Photoreceiver based on Photonic Power Supply 査読あり
T. Umezawa, K. Kashima, A. Kanno, K. Akahane, A. Matsumoto, N. Yamamoto, T. Kawanishi
2016 21ST OPTOELECTRONICS AND COMMUNICATIONS CONFERENCE (OECC) HELD JOINTLY WITH 2016 INTERNATIONAL CONFERENCE ON PHOTONICS IN SWITCHING (PS) 2016年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
A 100 GHz photoreceiver was designed, fabricated, and integrated with a pHEMT amplifier, based on a photonic power supply. In this paper, a high data rate photonic wireless communication over 11 Gbps is demonstrated.
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Nondestructive Reflection Imaging in the W-band Using Photonics-Based Incoherent Signal Source 査読あり
Atsushi Kanno, Norihiko Sekine, Akifumi Kasamatsu, Naokatsu Yamamoto, Mitsuru Yoshida, Norio Masuda
2016 IEEE MTT-S INTERNATIONAL MICROWAVE SYMPOSIUM (IMS) 2016年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
Radio-based nondestructive imaging is demonstrated with photonics-based signal source. Photonics technology has advantages on use of an amplified spontaneous emission noise from an optical amplifier utilized as an incoherent signal and easy distribution feature via an optical fiber network. Fiber-remoted optical-to-millimeter-wave converter irradiates 90-GHz radio waves based on an optical fiber network technology. Low-loss optical fibers enable scalability to increase of a number of converters and flexibility of location configuration of illuminators. Reflection imaging is performed in a 90-GHz band under single and multi-illumination configuration. Obtained images are consistent with theoretical resolution.
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Electro-Optic Modulator Using Millimeter-wave Gap-Embedded Patch Antenna with Stacked Structure 査読あり
Hironori Aya, Yusuf Nur Wijayanto, Atsushi Kanno, Tetsuya Kawanishi, Hiroshi Murata, Yasuyuki Okamura
2016 21ST OPTOELECTRONICS AND COMMUNICATIONS CONFERENCE (OECC) HELD JOINTLY WITH 2016 INTERNATIONAL CONFERENCE ON PHOTONICS IN SWITCHING (PS) 2016年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
We propose new electro-optic modulators using gap-embedded patch antennas with stacked structure. Utilizing stacked structure, the antenna gain, electric field for modulation, and interaction length increase, then modulation efficiency increases 3.65 dB at 60 GHz.
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High-conversion-gain 100-GHz photoreceiver integrated with UTC-PD and PHEMT amplifier for 92-GHz carrier, 10.7-Gbps photonic wireless communication 査読あり
T. Umezawa, K. Kashima, A. Kanno, P. T. Dat, K. Akahane, A. Matsumoto, N. Yamamoto, T. Kawanishi
2016 11TH EUROPEAN MICROWAVE INTEGRATED CIRCUITS CONFERENCE (EUMIC) 468 - 471 2016年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
We successfully designed and fabricated a highconversion-gain 100-GHz photoreceiver integrated with a UTC-PD and a PHEMT amplifier for 92-GHz carrier photonic wireless communication. Then, in a demonstration of 92-GHz carrier, OFDM, 16-QAM photonic wireless communication, we confirmed that high data rate of 11.03-Gbps (bit error rate of 1 x 10(-3)) could be achieved at a low optical input power, without post amplifiers for the photoreceiver. The designs and the results are discussed.
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High-Capacity and High-Spectral-Efficiency Seamless Fiber-Wireless System for High-Speed Trains 査読あり
Pham Tien Dat, Atsushi Kanno, Naokatsu Yamamoto, Tetsuya Kawanishi
2016 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXHIBITION (OFC) 2016年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
We propose a dual-hop network to high-speed trains by using a seamless fiber-millimeter-wave system for backhaul transmission and a high-speed in-train network. Transmission of a 64-QAM OFDM signal over the cascaded system is successfully confirmed.
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100 GHz fiber-fed optical-to-radio converter 査読あり
T. Umezawa, K. Kashima, K. Akahane, A. Kanno, N. Yamamoto, T. Kawanishi
2016 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO) 2016年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
We demonstrate 100-GHz optical-to-radio converter without electric power supplies by combination of a newly developed bias-free-operational UTC-PD and an integrated bias-tee for effective regeneration of the supplied power to a 100-GHz amplifier.
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Frequency-Stabilized Multi-Tone Signal Generation By Optical Frequency Locked-Loop And Optical Frequency Comb 査読あり
Jinsei Oba, Kosuke Kamikawa, Atsushi Kanno, Naokatsu Yamamoto, Hideyuki Sotobayashi
2016 21ST OPTOELECTRONICS AND COMMUNICATIONS CONFERENCE (OECC) HELD JOINTLY WITH 2016 INTERNATIONAL CONFERENCE ON PHOTONICS IN SWITCHING (PS) 2016年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
We demonstrate frequency-stabilized millimeter-wave signal generation system using optical frequency locked-loop technique employed with an optical frequency comb. Observed frequency fluctuation system realized drastic reduction as compared with the fluctuation generated by two free-running lasers.
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Performance of 90GHz Electro-Optic Modulator with Patch-Antennas in High-Power Wireless Irradiation 査読あり
Yusuf Nur Wijayanto, Atsushi Kanno, Tetsuya Kawanishi, Hiroshi Murata, Naokatsu Yamamoto, Yasuyuki Okamura
2016 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO) 2016年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
We report a recent progress for performance of 90GHz electro-optic modulator with patch-antennas in high-power wireless radio irradiation. Optical sidebands to carrier ratio of -40dB can be achieved by wireless radio irradiation power of 33dBm.
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Multi-layered stacked patch-antennas on electro-optic material for optical modulation 査読あり
Y. N. Wijayanto, A. Kanno, T. Kawanishi, H. Murata, T. Umezawa, N. Yamamoto, Y. Okamura
European Microwave Week 2016: "Microwaves Everywhere", EuMW 2016 - Conference Proceedings; 46th European Microwave Conference, EuMC 2016 945 - 948 2016年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：Institute of Electrical and Electronics Engineers Inc.
Multi-layered stacked patch-antennas on an electro-optic (EO) material are proposed for optical modulation. By using multi-layered structures, larger antenna gain can be obtained to induce stronger millimeter-wave electric fields. The induced millimeter-wave electric field can be used for optical modulation through the Pockels effects of the EO crystal. Since the antenna gain is enhanced by using multi-layered stacked patch-antennas, the modulation index improvement can be obtained.
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High Conversion Gain 30-110 GHz Photoreceivers for High Data-Rate Advanced Photonic Wireless Communications 査読あり
T. Umezawa, K. Jitsuno, A. Kanno, N. Yamamoto, T. Kawanishi
2016 IEEE Sixth International Conference on Communications and Electronics (ICCE) 389 - 392 2016年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
We report a 30-110 GHz, high conversion gain, and high output photodetector consisting of a hybrid integration of a high-speed photodetector and an RF amplifier with an additional gain emphasis circuit. High data-rate photonic wireless communication over 44 Gbps was demonstrated with a predistortion technique. The minimum optical input power level for an error free operation was also discussed.
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Free-Space Millimeter-Wave Electro-optic Modulators Using Quasi-Phase-Matching Gap-Embedded-Patch-Antennas on Low Dielectric Constant Substrate 査読あり
Yusuf Nur Wijayanto, Atsushi Kanno, Hiroshi Murata, Tetsuya Kawanishi, Naokatsu Yamamoto, Yasuyuki Okamura
PHOTOPTICS 2015 181 83 - 103 2016年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：SPRINGER INT PUBLISHING AG
Conversion devices between free-space microwave/millimeter-wave and lightwave signals are required in Fiber-Wireless (Fi-Wi) links. In this paper, we propose a free-space millimeter-wave Electro-Optic (EO) modulator using Quasi-Phase-Matching (QPM) gap-embedded-patch-antennas on a low dielectric constant substrate. Free-space millimeter-wave signals can be received and converted directly to lightwave signals using the proposed device. It can be operated passively with no external power supply and operated with extremely low millimeter-wave losses. The QPM array structure can be adopted for improving modulation efficiency by considering the transit-time effects. The proposed device is easy connected to optical fiber, therefore Fi-Wi can be realized using the proposed device. Basic structure, analysis, and experimental results of the proposed device are discussed and reported for 40 GHz operational millimeter-wave bands.
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Evaluation of Quadrature-Phase-Shift-Keying Signal Characteristics in W-band Radio over Fiber Transmission using Direct In-Phase/Quadrature-Phase Conversion Technique 査読あり
Meisaku Suzuki, Atsushi Kanno, Naokatsu Yamamoto, Hideyuki Sotobayashi
BROADBAND ACCESS COMMUNICATION TECHNOLOGIES X 9772 2016年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：SPIE-INT SOC OPTICAL ENGINEERING
The effects of in-phase/quadrature-phase (IQ) imbalances are evaluated with a direct IQ down-converter in the W-band (75-110 GHz). The IQ imbalance of the converter is measured within a range of +/-10 degrees in an intermediate frequency of DC-26.5 GHz. 1-8-G-baud quadrature phase-shift keying (QPSK) signals are transmitted successfully with observed bit error rates within a forward error correction limit of 2x10(-3) using radio over fiber (RoF) techniques. The direct down-conversion technique is applicable to next-generation high-speed wireless access communication systems in the millimeter-wave band.
DOI： 10.1117/12.2212569
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Change of frequency separation for two-mode quantum dot lasers by using a birefringent etalon filter 査読あり
Kouichi Akahane, Masaki Inui, Toshimasa Umezawa, Atsushi Kanno, Naokatsu Yamamoto, Tetsuya Kawanishi, Hideyuki Sotobayashi
2016 41ST INTERNATIONAL CONFERENCE ON INFRARED, MILLIMETER, AND TERAHERTZ WAVES (IRMMW-THZ) 2016年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
We have developed a stable two-mode laser by using a quantum dot optical gain chip in an external cavity. In this study, we demonstrate continuous change of frequency separation of a two-mode laser by using a birefringent etalon filter. Since the polarization of the quantum dot optical gain chip is TE-dominant, the frequency separation of the two-mode laser is controlled by rotating the birefringent etalon filter. We can change the frequency separation from 84 to 93 GHz by using this method.
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Broadband frequency-chirped terahertz-wave signal generation using periodically-poled lithium niobate for frequency-modulated continuous-wave radar application 査読あり
Junichi Hamazaki, Yoh Ogawa, Norihiko Sekine, Akifumi Kasamatsu, Atsushi Kanno, Naokatsu Yamamoto, Iwao Hosako
Proceedings of SPIE - The International Society for Optical Engineering 9747 2016年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：SPIE
We have proposed a method by using a nonlinear optical technique to generate frequency-modulated (FM) signals in the terahertz (THz) band with much broader bandwidth. Periodically-poled lithium niobates (PPLNs) are excited by ultrashort pulses, and linearly frequency-chirped THz pulses are obtained by changing the periodicity of the PPLN gradually. The bandwidth achieved is approximately 1 THz at a center frequency of 1.5 THz. Using this wave in a FM continuous (CW) radar system is expected to result in a range resolution of ∼150 μm. This FM-THz signal generation technique will thus be useful in or future civil safety applications requiring high-resolution ranging or imaging.
DOI： 10.1117/12.2210936
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90 Gb/s Hybrid Integrated Photoreceiver Module with High Speed 1.5 mu m-Band QD-SOA 査読あり
A. Matsumoto, T. Umezawa, K. Akahane, A. Kanno, N. Yamamoto, T. Kawanishi
2016 INTERNATIONAL SEMICONDUCTOR LASER CONFERENCE (ISLC) 2016年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
We investigated fundamental characteristics of a hybrid integrated photoreceiver module with a 1.5 mu m-band quantum dot semiconductor optical amplifier (QD-SOA) and conventional pin-photodiode (pin-PD) as a first stage. The results indicated the photoreceiver integrated with a QD-SOA and QD-PD has the potential to be operated for signals over 100 Gb/s.
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20-Gb/s QPSK Transmission Over 4-km-long Holey Fiber Using a Wavelength Tunable Quantum Dot Light Laser in T-band 査読あり
Akihiro Murano, Shoko Yamada, Atsushi Kanno, Naokatsu Yamamoto, Hideyuki Sotobayashi
NEXT-GENERATION OPTICAL COMMUNICATION: COMPONENTS, SUB-SYSTEMS, AND SYSTEMS V 9774 2016年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：SPIE-INT SOC OPTICAL ENGINEERING
We successfully demonstrate 10-Gbbaud quadrature phase-shift keying signal transmission over a 4-km-long endlessly single-mode holey fiber using a wavelength-tunable semiconductor quantum dot (QD) laser. The transmission is carried out in the waveband of 1040.72-1070.02 nm with a bandwidth of 7.89 THz, which is broader than conventional wavebands such as the C and L bands. In the study, a QD laser notable for its wavelength stability and tunability is employed for its broad bandwidth availability on the transmission. Observed bit error rates are within a forward error correction limit of 2 x 10(-3) under homodyne coherent detection configuration with offline digital signal processing. The abundant frequency resources in this T band (1000-1260 nm) help increase the capacity of a transmission link using a large number of wavelength channels by the QD laser.
DOI： 10.1117/12.2211697
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Seamless Access Networks Using Radio-over-Fiber Technology for High-Speed Trains 査読あり
Tetsuya Kawanishi, Atsushi Kanno, Pham Tien Dat, Naokatsu Yamamoto
2016 IEEE Sixth International Conference on Communications and Electronics (ICCE) 381 - 384 2016年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
This paper reviews seamless networks based on radio-over-fiber (RoF) technology. We focus on train communication networks (TCNs) consisting of optical networks and many radio access units (RAUs). Waveform for radio communications can be effectively delivered to each RAU by RoF. The TCN can be controlled by train location information to reduce overhead due to hand-over in mobile communication systems.
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Terahertz-Wave Signal Synthesizer for Fiber-Wireless Seamless Access Network 査読あり
Atsushi Kanno, Pham Tien Dat, Norihiko Sekine, Akifumi Kasamatsu, Naokatsu Yamamoto, Tetsuya Kawanishi
2016 IEEE Sixth International Conference on Communications and Electronics (ICCE) 403 - 407 2016年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
A photonic terahertz synthesizer is configured and demonstrated by100-GH, 300-GHz and 600-GHz signal generation. An optical frequency shifter in an amplified optical fiber loop technique configures an optical frequency comb generator with a resultant optical bandwidth up to 2 THz. An observed phase noise characteristic by the photonic synthesizer is considerable for application to the complex modulation formats even in the terahertz bands.
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W-band active imaging by photonics-based synthesizer 査読あり
Atsushi Kanno, Norihiko Sekine, Akifumi Kasamatsu, Naokatsu Yamamoto
PASSIVE AND ACTIVE MILLIMETER-WAVE IMAGING XIX 9830 2016年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：SPIE-INT SOC OPTICAL ENGINEERING
We demonstrate a nondestructive electromagnetic-wave imaging system with a photonics-based W-band synthesizer, traveling-wave tube amplifier and focal-plane transistor array in real time manner. High-power amplifier with multi-watts output will enhance the quality of obtained images under transmission and reflection imaging configurations.
DOI： 10.1117/12.2223312
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Wireless Millimeter-Wave-Lightwave Signal Converter using Stacked Patch-Antennas Embedded with A Micrometer-Gap and Electro-Optic Crystal 査読あり
Hironori Aya, Toshiyuki Inoue, Hiroshi Murata, Yasuyuki Okamura, Yusuf Nur Wijayanto, Atsushi Kanno, Tetsuya Kawanishi
PROCEEDINGS OF 2016 INTERNATIONAL CONFERENCE ON RADAR, ANTENNA, MICROWAVE, ELECTRONICS, AND TELECOMMUNICATIONS (ICRAMET) 77 - 80 2016年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
We have proposed a new electro-optic signal converter which enables us to convert wireless millimeter-wave signals to Iightwave signals. This is based on a LiNbO3 guided-wave optical modulator combined with vertically-stacked planar patch antennas embedded with a narrow (similar to 5 mu m) gap. Utilizing the stacked structure, the antenna gain, antenna area, and electric field for optical modulation are increased, so that the signal conversion efficiency is increased by 3.65 dB at 60 GHz.
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High speed photoreceiver over 100 GHz and its application 査読あり
T. Umezawa, K. Kashima, K. Akahane, A. Matsumoto, A. Kanno, N. Yamamoto, T. Kawanishi
2016 IEEE PHOTONICS CONFERENCE (IPC) 562 - 563 2016年
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Wireless Millimeter-Wave-Lightwave Signal Converter using Stacked Patch-Antennas Embedded with A Micrometer-Gap and Electro-Optic Crystal 査読あり
Hironori Aya, Toshiyuki Inoue, Hiroshi Murata, Yasuyuki Okamura, Yusuf Nur Wijayanto, Atsushi Kanno, Tetsuya Kawanishi
PROCEEDINGS OF 2016 INTERNATIONAL CONFERENCE ON RADAR, ANTENNA, MICROWAVE, ELECTRONICS, AND TELECOMMUNICATIONS (ICRAMET) 77 - 80 2016年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
We have proposed a new electro-optic signal converter which enables us to convert wireless millimeter-wave signals to Iightwave signals. This is based on a LiNbO3 guided-wave optical modulator combined with vertically-stacked planar patch antennas embedded with a narrow (similar to 5 mu m) gap. Utilizing the stacked structure, the antenna gain, antenna area, and electric field for optical modulation are increased, so that the signal conversion efficiency is increased by 3.65 dB at 60 GHz.
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W-band active imaging by photonics-based synthesizer 査読あり
Atsushi Kanno, Norihiko Sekine, Akifumi Kasamatsu, Naokatsu Yamamoto
PASSIVE AND ACTIVE MILLIMETER-WAVE IMAGING XIX 9830 2016年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：SPIE-INT SOC OPTICAL ENGINEERING
We demonstrate a nondestructive electromagnetic-wave imaging system with a photonics-based W-band synthesizer, traveling-wave tube amplifier and focal-plane transistor array in real time manner. High-power amplifier with multi-watts output will enhance the quality of obtained images under transmission and reflection imaging configurations.
DOI： 10.1117/12.2223312
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Terahertz-Wave Signal Synthesizer for Fiber-Wireless Seamless Access Network 査読あり
Atsushi Kanno, Pham Tien Dat, Norihiko Sekine, Akifumi Kasamatsu, Naokatsu Yamamoto, Tetsuya Kawanishi
2016 IEEE Sixth International Conference on Communications and Electronics (ICCE) 403 - 407 2016年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
A photonic terahertz synthesizer is configured and demonstrated by100-GH, 300-GHz and 600-GHz signal generation. An optical frequency shifter in an amplified optical fiber loop technique configures an optical frequency comb generator with a resultant optical bandwidth up to 2 THz. An observed phase noise characteristic by the photonic synthesizer is considerable for application to the complex modulation formats even in the terahertz bands.
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Seamless Access Networks Using Radio-over-Fiber Technology for High-Speed Trains 査読あり
Tetsuya Kawanishi, Atsushi Kanno, Pham Tien Dat, Naokatsu Yamamoto
2016 IEEE Sixth International Conference on Communications and Electronics (ICCE) 381 - 384 2016年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
This paper reviews seamless networks based on radio-over-fiber (RoF) technology. We focus on train communication networks (TCNs) consisting of optical networks and many radio access units (RAUs). Waveform for radio communications can be effectively delivered to each RAU by RoF. The TCN can be controlled by train location information to reduce overhead due to hand-over in mobile communication systems.
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Propagation Effect of Broadband Frequency-Chirped THz Wave Pulse in Periodically Poled Lithium Niobate 査読あり
Junichi Hamazaki, Yoh Ogawa, Norihiko Sekine, Akifumi Kasamatsu, Atsushi Kanno, Naokatsu Yamamoto, Iwao Hosako
2016 41ST INTERNATIONAL CONFERENCE ON INFRARED, MILLIMETER, AND TERAHERTZ WAVES (IRMMW-THZ) 2016年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
Broadband frequency-chirped multi-cycle terahertz wave (THz) pulses have been generated from periodically poled lithium niobates (PPLNs). Up-and down-chirped THz pulses with temporal frequency shifts from 1 to 1.7 THz and 2 to 1 THz, respectively, were measured. In the waveforms of the both chirped THz pulses, large fluctuation of THz electric field amplitude was observed. Since the fluctuation disturbs exact estimation of temporal frequency shift of chirped THz pulses, suppressing the fluctuation is desired for applications using chirped THz pulses. For this purpose, the origin of the fluctuation of chirped THz pulses have been investigated.
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Precise Measurement Techniques for Optical-to-electric Conversion Devices 査読あり
Tetsuya Kawanishi, Keizo Inagaki, Atsushi Kanno, Naokatsu Yamamoto
2016 PROGRESS IN ELECTROMAGNETICS RESEARCH SYMPOSIUM (PIERS) 3906 - 3906 2016年
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Photonics-based 1-THz signal generation and its evaluation on phase noise characteristics 査読あり
A. Kanno, N. Sekine, A. Kasamatsu, N. Yamamoto
2016 41ST INTERNATIONAL CONFERENCE ON INFRARED, MILLIMETER, AND TERAHERTZ WAVES (IRMMW-THZ) 2016年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
1-THz continuous-wave signal is generated by an optical frequency comb generator utilized as a 41st-order multiplier. Phase noise characteristics of generated signal are evaluated by heterodyne detector and microwave electrical spectrum analyzer.
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Optical Pulse Response of 20 Layer-stacked QD-SOA Grown with the Strain Compensation Technique by Using an Optical Frequency Comb 査読あり
Atsushi Matsumoto, Kouichi Akahane, Takahide Sakamoto, Toshimasa Umezawa, Atsushi Kanno, Naokatsu Yamamoto
2016 COMPOUND SEMICONDUCTOR WEEK (CSW) INCLUDES 28TH INTERNATIONAL CONFERENCE ON INDIUM PHOSPHIDE & RELATED MATERIALS (IPRM) & 43RD INTERNATIONAL SYMPOSIUM ON COMPOUND SEMICONDUCTORS (ISCS) 2016年
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OFDM Millimeter-Wave Radar Experiment Combined with Radio over Fiber Technology 査読あり
T. Umezawa, K. Jitsuno, A. Kanno, K. Akahane, N. Yamamoto, T. Kawanishi
2016 41ST INTERNATIONAL CONFERENCE ON INFRARED, MILLIMETER, AND TERAHERTZ WAVES (IRMMW-THZ) 2016年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
We have demonstrated an orthogonal frequency division multiplexing (OFDM) radar experiment combined with millimeter-wave radio over fiber (RoF). In result, high flame rate and high space resolution of 30 cm in 5 m distance (theoretical space resolution of 1.52 cm) was successfully achieved.
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Millimeter-wave Radio-over-fiber System for High-speed Railway Communication 査読あり
A. Kanno, P. T. Dat, N. Yamamoto, T. Kawanishi
2016 PROGRESS IN ELECTROMAGNETICS RESEARCH SYMPOSIUM (PIERS) 3911 - 3915 2016年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
We propose an architecture of the radio-over-fiber systems for train communication networks. Prediction-based dynamic optical routing can track the train cars by train location information. High spectral-efficient millimeter-wave signal modulation and demodulation are also discussed with the modulation format and its configuration of the frequency conversions in the paper.
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Low-Latency Fiber-Millimeter-Wave System for Future Mobile Fronthauling 査読あり
Pham Tien Dat, Atsushi Kanno, Naokatsu Yamamoto, Tetsuya Kawanishi
BROADBAND ACCESS COMMUNICATION TECHNOLOGIES X 9772 2016年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：SPIE-INT SOC OPTICAL ENGINEERING
A seamless combination of fiber and millimeter-wave (MMW) systems can be very attractive for future heterogeneous mobile networks such as 5G because of its flexibility and high bandwidth. Analog mobile signal transmission over seamless fiber-MMW systems is very promising to reduce the latency and the required band-width, and to simplify the systems. However, stable and high-performance seamless systems are indispensable to conserve the quality of the analog signal transmission. In this paper, we present several technologies to develop such seamless fiber-MMW systems. In the downlink direction, a high-performance system can be realized using a high-quality optical MMW signal generator and a self-homodyne MMW signal detector. In the uplink direction, a cascade of radio-on-radio and radio-over-fiber systems using a burst-mode optical amplifier can support bursty radio signal transmission. A full-duplex transmission with negligible interference effects can be realized using frequency multiplexing in the radio link and wavelength-division multiplexing in the optical link. A high-spectral efficiency MMW-over-fiber system using an intermediate frequency-over-fiber system and a high-quality remote delivery of a local oscillator signal is highly desirable to reduce the costs.
DOI： 10.1117/12.2212059
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Key Technologies for Millimeter-Wave Distributed RADAR System over A Radio Over Fiber Network 査読あり
Atsushi Kanno, Toshimasa Umezawa, Toshiaki Kuri, Naokatsu Yamamoto, Yusuf Nur Wijayanto, Tetsuya Kawanishi
PROCEEDINGS OF 2016 INTERNATIONAL CONFERENCE ON RADAR, ANTENNA, MICROWAVE, ELECTRONICS, AND TELECOMMUNICATIONS (ICRAMET) 1 - 6 2016年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
We discuss key device technologies for realization of an optical-fiber-network-connected distributed radar system in the millimeter-wave band using radio over fiber techniques. The radio over fiber technique is useful for precise signal generation and distribution over the fiber network. In the scenario, each millimeter-wave radar head is not necessary to be equipped with aprecision radar signal source; low cost and low energy consumption radar head will be realized. For connection to the optical network, advanced high-speed optical/electrical converters are developed for signal conversion from/to optical signals in 90-GHz band directly in a central office and each radar head. A signal-to-noise power ratio of generated 90-GHz optical signal was achieved larger than 30 dB: enough quality to use in the radar system. An optical switching technique is useful not only for routing the optical signal to the radar heads but also for filtering unnecessary optical components. These device technologies are applicable for distributed millimeter-wave radar systems.
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High-efficiency W-band hybrid integrated photoreceiver module using UTC-PD and pHEMT amplifier 査読あり
T. Umezawa, K. Katshima, A. Kanno, K. Akahane, A. Matsumoto, N. Yamamoto, T. Kawanishi
TERAHERTZ, RF, MILLIMETER, AND SUBMILLIMETER-WAVE TECHNOLOGY AND APPLICATIONS IX 9747 2016年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：SPIE-INT SOC OPTICAL ENGINEERING
A 100-GHz narrowband photoreceiver module integrated with a zero-bias operational uni-traveling-carrier photodiode (UTC-PD) and a GaAs-based pseudomorphic high-electron-mobility transistor (pHEMT) amplifier was fabricated and characterized. Both devices exhibited flat frequency response and outstanding overall performance. The UTC-PD showed a 3-dB bandwidth beyond 110 GHz while the pHEMT amplifier featured low power consumption and a gain of 24 dB over the 85-100 GHz range. A butterfly metal package equipped with a 1.0 mm (W) coaxial connector and a microstrip-coplanar waveguide conversion substrate was designed for low insertion loss and low return loss. The fabricated photoreceiver module demonstrated high conversion gain, a maximum output power of +9.5 dBm at 96 GHz, and DC-power consumption of 0.21 W.
DOI： 10.1117/12.2209735
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Multi-core based 94-GHz radio and power over fiber transmission using 100-GHz analog photoreceiver
T. Umezawa, A. Kanno, P. T. Dat, K. Akahane, Y. Awaji, N. Yamamoto, T. Kawanishi
European Conference on Optical Communication, ECOC 1235 - 1237 2016年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：Institute of Electrical and Electronics Engineers Inc.
We propose a multi-core-based radio and power over fiber transmission using a 100 GHz photoreceiver, and demonstrate 1 m photonic wireless transmission at 10 Gbps (OFDM, 16QAM, 3 GHz) through a photonic power supply via cores in a multi-core fiber.
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Optical amplitude modulator linearized by integration of optical interferometric waveguides
Yuya Yamaguchi, Atsushi Kanno, Tetsuya Kawanishi, Masayuki Izutsu, Hirochika Nakajima
European Conference on Optical Communication, ECOC 1055 - 1057 2016年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：Institute of Electrical and Electronics Engineers Inc.
We propose an optical amplitude modulator with tailored transfer function by integration of Mach-Zehnder-interferometer-based waveguides. The fabricated modulator designed to enhance the linearity showed a unique transfer function in good agreement with the theoretical one.
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Bias-free high-baud-rate UTC-PD for high-density implementations in parallel photonics
T. Umezawa, A. Matsumoto, K. Akahane, A. Kanno, N. Yamamoto, T. Kawanishi
Asia Communications and Photonics Conference, ACPC 2015 2015年12月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：Optical Society of America (OSA)
We discussed crosstalk issues on parallel photonics assuming high-density integration. RF crosstalk has become a more serious problem than optical crosstalk, and it is affected by the operating frequency (baud rate). A bias free UTC-PD was designed and fabricated. © 2015 OSA.
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Millimeter-wave wireless beam-steering using patch-Antennas with meandering-gaps on electro-optical modulator 査読あり
Y. N. Wijayanto, A. Kanno, T. Kawanishi, H. Murata, Y. Okamura
European Microwave Week 2015: "Freedom Through Microwaves", EuMW 2015 - Conference Proceedings; 2015 45th European Microwave Conference Proceedings, EuMC 1140 - 1143 2015年12月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：Institute of Electrical and Electronics Engineers Inc.
A new scheme for millimeter-wave wireless beam-steering using NxN patch-Antennas with meandering-gaps on an electro-optic (EO) modulator is proposed for high-speed radio-over-fiber systems. The wireless receiving beam can be steered by controlling interaction between millimeter-wave and lightwave electric fields in EO modulation using meandering-gaps. Analysis and experimental demonstration of the proposed device for 40GHz millimeter-wave bands are reported. A 5×5 antenna array is designed for 0±30 degrees wireless steerable beams. 5 and 25 variations of wireless beam-steering can be obtained for 1-D in xz-or yz-planes and 2-D in xyz-space, respectively.
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Millimeter-wave wireless beam-steering using patch-antennas with meandering-gaps on electro-optical modulator 査読あり
Y. N. Wijayanto, A. Kanno, T. Kawanishi, H. Murata, Y. Okamura
European Microwave Week 2015: 289 - 292 2015年12月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：Institute of Electrical and Electronics Engineers Inc.
A new scheme for millimeter-wave wireless beam-steering using NxN patch-antennas with meandering-gaps on an electro-optic (EO) modulator is proposed for high-speed radio-over-fiber systems. The wireless receiving beam can be steered by controlling interaction between millimeter-wave and lightwave electric fields in EO modulation using meandering-gaps. Analysis and experimental demonstration of the proposed device for 40GHz millimeter-wave bands are reported. A 5×5 antenna array is designed for ±30 degrees wireless steerable beams. 5 and 25 variations of wireless beam-steering can be obtained for 1-D in xz-or yz-planes and 2-D in xyz-space, respectively.
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High-Speed Coherent Transmission Using Advanced Photonics in Terahertz Bands 査読あり
Atsushi Kanno, Pham Tien Dat, Norihiko Sekine, Iwao Hosako, Tetsuya Kawanishi, Yuki Yoshida, Ken'ichi Kitayama
IEICE TRANSACTIONS ON ELECTRONICS E98C ( 12 ) 1071 - 1080 2015年12月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG
A terahertz-wave communication system directly connected to an optical fiber network is promising for application to future mobile backhaul and fronthaul links. The possible broad bandwidth in the terahertz band is useful for high-speed signal transmission as well as radio-space encapsulation to the high-frequency carrier. In both cases, the low-latency feature becomes important to enhance the throughput in mobile communication and is realized by waveform transport technology without any digital-signal-processing-basedmedia conversion. A highly precise optical frequency comb signal generated by optical modulation and the vector signal demodulation technology adopted from advanced optical fiber communication technologies help perform modulation and demodulation with impairment compensation at just the edges of the link. Terahertz wave, radio over fiber, waveform transport, coherent detection, multilevel modulation, radio on radio.
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WDM RoF-MMW and Linearly Located Distributed Antenna System for Future High-Speed Railway Communications 査読あり
Pham Tien Dat, Atsushi Kanno, Naokatsu Yamamoto, Testuya Kawanishi
IEEE COMMUNICATIONS MAGAZINE 53 ( 10 ) 86 - 94 2015年10月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
In this article, we propose dual-hop network architecture capable of providing high-speed communications to high-speed trains (HSTs). The system uses a seamless fiber-millimeter-wave system for backhaul transmission from a central station to antennas on trains, and a highspeed in-train Wi-Fi network. The system can be combined with signal processing and network control technologies to compensate for interference and the Doppler effect, and to reduce the number of handovers. It can realize seamless connectivity between the inside and outside of trains to avoid penetration loss and help organize the in-train network optimally to increase coverage and data rate. We present and discuss the possible network architecture and technologies that can help realize the proposed network. We also present a proof-of-concept demonstration on a high-performance seamless fiber-MMW system that can be applied for applications in backhaul networks. The proposed network can be an attractive solution to provide broadband services such as video on demand and high-speed mobile signals to users on HSTs.
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RADIO-ON-RADIO-OVER-FIBER: EFFICIENT FRONTHAULING FOR SMALL CELLS AND MOVING CELLS 査読あり
Pham Tien Dat, Atsushi Kanno, Tetsuya Kawanishi
IEEE WIRELESS COMMUNICATIONS 22 ( 5 ) 67 - 75 2015年10月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
A combination of fiber and radio links would be attractive for efficient fronthauling to small cells and moving cells. However, achieving connectivity by using wired-wireless media converters significantly increases system complexity, power consumption, and latency. A seamless combination of fiber and radio links in which photonics-based technologies are used to generate and transmit radiowave signals is more suitable. In this article, we present an overview of fiber-radio link combination for mobile signal transmission. We propose an efficient solution for future mobile fronthauling based on the analog transmission of mobile signals over a bidirectional seamless system. We discuss the potential as well as the challenges and perspectives of the systems applied for mobile fronthauling in small-cell-and moving-cell-based networks. We also present a proof-of-concept demonstration of the transmission of mobile signals over the system. Satisfactory performance is obtained for different high-speed advanced signals. The transmission range over fiber links and the estimated range of the radio links are sufficiently long to facilitate the practical implementation of the system. The system is scalable to include new deployments of small cells and wireless services using wavelength-division and subcarrier multiplexing techniques. It can provide a high-speed, low-latency, and flexible solution for fronthauling in new emerging wireless systems such as 5G networks.
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RADIO-ON-RADIO-OVER-FIBER: EFFICIENT FRONTHAULING FOR SMALL CELLS AND MOVING CELLS 査読あり
Pham Tien Dat, Atsushi Kanno, Tetsuya Kawanishi
IEEE WIRELESS COMMUNICATIONS 22 ( 5 ) 67 - 75 2015年10月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
A combination of fiber and radio links would be attractive for efficient fronthauling to small cells and moving cells. However, achieving connectivity by using wired-wireless media converters significantly increases system complexity, power consumption, and latency. A seamless combination of fiber and radio links in which photonics-based technologies are used to generate and transmit radiowave signals is more suitable. In this article, we present an overview of fiber-radio link combination for mobile signal transmission. We propose an efficient solution for future mobile fronthauling based on the analog transmission of mobile signals over a bidirectional seamless system. We discuss the potential as well as the challenges and perspectives of the systems applied for mobile fronthauling in small-cell-and moving-cell-based networks. We also present a proof-of-concept demonstration of the transmission of mobile signals over the system. Satisfactory performance is obtained for different high-speed advanced signals. The transmission range over fiber links and the estimated range of the radio links are sufficiently long to facilitate the practical implementation of the system. The system is scalable to include new deployments of small cells and wireless services using wavelength-division and subcarrier multiplexing techniques. It can provide a high-speed, low-latency, and flexible solution for fronthauling in new emerging wireless systems such as 5G networks.
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WDM RoF-MMW and Linearly Located Distributed Antenna System for Future High-Speed Railway Communications 査読あり
Pham Tien Dat, Atsushi Kanno, Naokatsu Yamamoto, Testuya Kawanishi
IEEE COMMUNICATIONS MAGAZINE 53 ( 10 ) 86 - 94 2015年10月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
In this article, we propose dual-hop network architecture capable of providing high-speed communications to high-speed trains (HSTs). The system uses a seamless fiber-millimeter-wave system for backhaul transmission from a central station to antennas on trains, and a highspeed in-train Wi-Fi network. The system can be combined with signal processing and network control technologies to compensate for interference and the Doppler effect, and to reduce the number of handovers. It can realize seamless connectivity between the inside and outside of trains to avoid penetration loss and help organize the in-train network optimally to increase coverage and data rate. We present and discuss the possible network architecture and technologies that can help realize the proposed network. We also present a proof-of-concept demonstration on a high-performance seamless fiber-MMW system that can be applied for applications in backhaul networks. The proposed network can be an attractive solution to provide broadband services such as video on demand and high-speed mobile signals to users on HSTs.
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Millimeter-wave LiNbO3 modulator with orthogonal-gap-embedded patch-antenna for fiber-wireless link 査読あり
Y. N. Wijayanto, A. Kanno, T. Kawanishi, H. Murata, Y. Okamura
IBP 2015 - 2015 IEEE International Broadband and Photonics Conference 23 - 26 2015年08月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：Institute of Electrical and Electronics Engineers Inc.
Millimeter-wave LiNbO3 optical modulators stacked to orthogonal-gap-embedded patch-antennas on low-k dielectric substrate is proposed for fiber-wireless (Fi-Wi) links. Direct conversion from wireless millimeter-wave to lightwave signals can be achieved using the proposed device. It can be operated with no external power supply. Experimentally demonstration of Fi-Wi link for 40GHz millimeter-wave bands using the proposed device is reported and discussed. Carrier-to-noise ratio of ∼30dB can be obtained in the Fi-Wi link.
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Re-Configurable Wavelength De-Multiplexer in Wavelength Division Multiplexed Radio-over-Fiber Systems for Frequency-Modulated Continuous-Wave Signal Delivery 査読あり
Toshiaki Kuri, Atsushi Kanno, Tetsuya Kawanishi
IEICE TRANSACTIONS ON ELECTRONICS E98C ( 8 ) 849 - 856 2015年08月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG
A re-configurable wavelength de-multiplexer for wave-length-division-multiplexed (WDM) radio-over-fiber (RoF) systems, which is specially designed for delivering frequency-modulated continuous-wave (FM-CW) signals, is newly developed. The principle and characteristics of the developed de-multiplexer are described in detail. Then the de-multiplexing performances of 4-channel WDM 32-GHz-band, 8-channel WDM 48-GHz-band, and 5-channel WDM 96-GHz-band FM-CW RoF signals are evaluated with the de-multiplexer.
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Millimeter-Wave Radar Receiver Using Z-Cut LiNbO3 Optical Modulator with Orthogonal-Gap-Embedded Patch-Antennas on Low-k Dielectric Material 査読あり
Yusuf Nur Wijayanto, Atsushi Kanno, Hiroshi Murata, Tetsuya Kawanishi, Yasuyuki Okamura
IEICE TRANSACTIONS ON ELECTRONICS E98C ( 8 ) 783 - 792 2015年08月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG
A millimeter-wave radar receiver using a z-cut LiNbO3 optical modulator with orthogonal-gap-embedded patch-antennas on a low-k dielectric material is proposed. A millimeter-wave from a reflected radar signal can be received by the patch-antennas and converted directly to a lightwave through electro-optic modulation. A low-k dielectric material is used as a substrate for improving antenna gain. Additionally, an interaction length between millimeter-wave and lightwave electric fields becomes long. As a result, large modulation efficiency can be obtained, which is proportional to sensitivity of the millimeter-wave radar receiver. Optical millimeter-wave radar beam-forming can be obtained using the proposed device with meandering-gaps for controlling interaction between millimeter-wave and lightwave electric fields in electro-optic modulation. Analysis and experimentally demonstration of the proposed device are discussed and reported for 40GHz millimeter-wave bands. Optical millimeter-wave radar beam-forming in 2-D is also discussed.
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Re-Configurable Wavelength De-Multiplexer in Wavelength Division Multiplexed Radio-over-Fiber Systems for Frequency-Modulated Continuous-Wave Signal Delivery 査読あり
Toshiaki Kuri, Atsushi Kanno, Tetsuya Kawanishi
IEICE TRANSACTIONS ON ELECTRONICS E98C ( 8 ) 849 - 856 2015年08月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG
A re-configurable wavelength de-multiplexer for wave-length-division-multiplexed (WDM) radio-over-fiber (RoF) systems, which is specially designed for delivering frequency-modulated continuous-wave (FM-CW) signals, is newly developed. The principle and characteristics of the developed de-multiplexer are described in detail. Then the de-multiplexing performances of 4-channel WDM 32-GHz-band, 8-channel WDM 48-GHz-band, and 5-channel WDM 96-GHz-band FM-CW RoF signals are evaluated with the de-multiplexer.
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Performance of Uplink Packetized LTE-A Signal Transmission on a Cascaded Radio-on-Radio and Radio-over-Fiber System 査読あり
Pham Tien Dat, Atsushi Kanno, Tetsuya Kawanishi
IEICE TRANSACTIONS ON ELECTRONICS E98C ( 8 ) 840 - 848 2015年08月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG
In this paper, we propose a flexible and high-capacity front-haul link for the uplink transmission of high-speed mobile signals using a cascade of radio-on-radio (RoR) and radio-over-fiber (RoF) systems. To emulate the cases that may occur in the uplink direction, we experimentally investigate the performance of superposing an uplink bursty LTE-A signal on the cascaded system using optical packet signal transmission. The performance of systems using different types of erbium-doped fiber amplifiers (EDFAs), including a high-transient EDFA, an automatic-gain-control EDFA, and a burst-mode (BM) EDFA is evaluated and compared. We confirm that the dynamic transience of the EDFAs has a significant influence on the signal performance. By using a BM-EDFA, we confirm successful transmission of the uplink packetized LTE-A signal on the cascaded system. Both the measured error vector magnitude and the received optical power range metrics exceed the requirements. We also estimate the maximum transmission range of the RoR link, and it is confirmed that a sufficiently long range could be achieved for the applications in mobile front-haul networks.
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New Burst-Mode Erbium-Doped Fiber Amplifier with Wide Linearity and High Output Power for Uplink Analog Radio-over-Fiber Signal Transmission 査読あり
Masaki Shiraiwa, Yoshinari Awaji, Naoya Wada, Atsushi Kanno, Toshiaki Kuri, Pham Tien Dat, Tetsuya Kawanishi
IEICE TRANSACTIONS ON ELECTRONICS E98C ( 8 ) 832 - 839 2015年08月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG
We report the adaptability of the burst-mode erbium-doped fiber amplifier (BM-EDFA) for uplink transmission of sharply rising analog radio-over-fiber (RoF) signals by using long-term evolution (LTE) -Advanced format on a mobile front-haul. Recent drastically increased mobile data traffic is boosting the demand for high-speed radio communication technologies for next-generation mobile services to enhance user experience. However, the latency become increasingly visible as serious issues. Analog RoF technology is a promising candidate for a next generation mobile front-haul to realize low latency. For the uplink, an RoF signal may rise sharply in response to a burst of in-coming radio signals. We propose that a newly developed BM-EDFA is applied for such a sharply rising RoF signal transmission. The BM-EDFA that we designed using enhanced intrinsic saturation power EDF to suppress the gain transient caused by received optical power fluctuations with optical feedback. The new BM-EDFA was designed for a wider linear output power range and lower NF than the previous BM-EDFA. The observed range of received optical power satisfying an error vector magnitude of less than 8%rms achieved over 16 dB. We consider that our BM-EDFAs with wide linear ranges of output power will be a key device for the LTE-Advanced RoF uplink signal transmission via optical access networks for the next-generation mobile front-haul.
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Sub-THz radio-over-fiber signal generation using external modulation 査読あり
Tetsuya Kawanishi, Takahide Sakamoto, Atsushi Kanno
IEICE ELECTRONICS EXPRESS 12 ( 13 ) 2015年07月
記述言語：英語 出版者・発行元：IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG
This paper describes photonic technologies for millimeter-wave generation and distribution. External modulation would be useful for stable and high-quality radio-over-fiber signal generation, where frequency stability and spurious suppression are very important for radio services such as mobile communications, radio locations etc. This paper provides outline of radio-over-fiber signal generation techniques. Precise and high-speed light-wave optical modulation would play important roles for suppression of undesired spectrum components. Photonic harmonic generation would be useful for very high-frequency signals. Reciprocating optical modulators consisting of optical modulators and fiber Bragg gratings can provide optical modulation by sub-THz signals.
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Sub-THz radio-over-fiber signal generation using external modulation 査読あり
Tetsuya Kawanishi, Takahide Sakamoto, Atsushi Kanno
IEICE ELECTRONICS EXPRESS 12 ( 13 ) 2015年07月
記述言語：英語 出版者・発行元：IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG
This paper describes photonic technologies for millimeter-wave generation and distribution. External modulation would be useful for stable and high-quality radio-over-fiber signal generation, where frequency stability and spurious suppression are very important for radio services such as mobile communications, radio locations etc. This paper provides outline of radio-over-fiber signal generation techniques. Precise and high-speed light-wave optical modulation would play important roles for suppression of undesired spectrum components. Photonic harmonic generation would be useful for very high-frequency signals. Reciprocating optical modulators consisting of optical modulators and fiber Bragg gratings can provide optical modulation by sub-THz signals.
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Mode-division multiplexed W-Band RoF transmission for higher-order spatial multiplexing
N. P. Diamantopoulos, S. Inudo, Y. Yoshida, A. Maruta, A. Kanno, P. T. Dat, T. Kawanishi, R. Maruyama, N. Kuwaki, S. Matsuo, K. Kitayama
Conference on Optical Fiber Communication, Technical Digest Series 2015- 2015年06月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：Institute of Electrical and Electronics Engineers Inc.
20Gb/s seamless 2×2 MIMO transmission of W-Band millimeter-wave signals over a 30-km modal-dispersion-compensated mode-division multiplexed link and a 2.5-m wireless path, is demonstrated for enhancing the transmission capacity in radio-over-fiber systems.
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Fiber-wireless signal transport by terahertz waves 査読あり
Atsushi Kanno
International Conference on Advanced Technologies for Communications 2015- 766 - 769 2015年02月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE Computer Society
In this study, a high-capacity and low-latency fiber-wireless signal transport technology in the terahertz band is discussed. An advanced optical fiber communication technology is easily adopted for high-capacity terahertz signal transmission, as well as for encapsulation of existing radio services into the terahertz carrier.
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Coherent Terahertz Wireless Signal Transmission Using Advanced Optical Fiber Communication Technology 査読あり
Atsushi Kanno, Toshiaki Kuri, Isao Morohashi, Iwao Hosako, Tetsuya Kawanishi, Yuki Yoshida, Ken-ichi Kitayama
JOURNAL OF INFRARED MILLIMETER AND TERAHERTZ WAVES 36 ( 2 ) 180 - 197 2015年02月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：SPRINGER
Coherent terahertz signal transmission with multilevel modulation and demodulation is demonstrated using an optical sub-harmonic IQ mixer (SHIQM), which consists of optical components in advanced optical fiber communication technologies. An optical-frequency-comb-employed signal generator is capable of vector modulation as well as frequency tunability. Digital signal processing (DSP) adopted from the recently developed optical digital coherent communication can easily demodulate multi-level modulated terahertz signals by using electrical heterodyning for intermediate-frequency (IF) down conversion. This technique is applicable for mobile backhauling in the next-generation mobile communication technology directly connected to an optical fiber network as a high-speed wireless transmission link.
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22.4 Gbps Photonic Wireless Transmission in Single-Carrier 16-QAM Using High-Sensitivity 34 GHz Analog Photoreceiver 査読あり
T. Umezawa, K. Akahane, N. Yamamoto, A. Kanno, N. Shibagaki, T. Kawanishi
2015 OPTO-ELECTRONICS AND COMMUNICATIONS CONFERENCE (OECC) 2015年
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Low-Latency Fiber-Wireless Bridge for Flexible Fronthauling in Future Mobile Networks 査読あり
Pham Tien Dat, Atsushi Kanno, Tetsuya Kawanishi
2015 45TH EUROPEAN MICROWAVE CONFERENCE (EUMC) 1156 - 1159 2015年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
We propose a flexible and low-latency cascaded fiber-wireless system for future mobile fronthauling using seamless combination of fiber-optic and millimeter-wave links. Successful transmission of intraband and interband carrier aggregation LTE-A signals over the system is experimentally confirmed. Satisfactory performance is achieved owing to the use of a high-quality optical millimeter-wave signal generation technique at the transmitter and a proposed high-performance self-homodyne detection at the receiver.
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1.5 mu m High Density Quantum Dots Waveguide Photodetector with Avalanche Effect 査読あり
T. Umezawa, K. Akahane, N. Yamamoto, A. Kanno, T. Kawanishi
2015 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO) 2015年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
We have fabricated a waveguide photodetector using a 1.55-mu m high-density InAs quantum dot absorption layer. A high responsivity (0.4 A/W) without using fiber coupling designs, and a large avalanche multiplication factor of over 10 could be successfully achieved.
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10-Gb/s Wireless Signal Transmission over a Seamless IM/DD Fiber-MMW System at 92.5 GHz 査読あり
Tu Lam Thanh, Vo Nguyen Quoc Bao, Pham Tien Dat, Atsushi Kanno, Tetsuya Kawanishi
2015 IEEE INTERNATIONAL CONFERENCE ON COMMUNICATIONS (ICC) 1364 - 1369 2015年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
In this paper, we propose a high-speed wireless signal transmission over a simple analog intensity modulation/ direct detection (IM/DD) fiber-millimeter-wave (MMW) system at 92.5 GHz. The system employs a frequency and phase stabilized optical MMW signal generation at transmitter and a simple direct detection at receiver. We confirm a successful transmission of 10Gb/s 16-QAM OFDM-based wireless signal over a seamless 8-km SMF and 27-cm 92.5-GHz wireless system. To further increase the fiber transmission range, we use a simple adaptive modulation approach. Successful transmission over 10-km single mode fiber (SMF) system is confirmed for a 8.1 Gb/s wireless signal using both 16-QAM and QPSK modulation. We also estimate the maximum transmission range for the MMW link, and it is proved that a transmission over a 1-km MMW link can be achieved. Both the confirmed fiber length and estimated MMW range are sufficiently long for future mobile front-haul systems in next generation wireless networks. The system therefore can provide a high-speed, low-latency, and flexible solution for front-hauling in new emerging wireless systems such as 5G mobile networks.
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Low-Latency Fiber-Wireless Bridge for Flexible Fronthauling in Future Mobile Networks 査読あり
Pham Tien Dat, Atsushi Kanno, Tetsuya Kawanishi
2015 10TH EUROPEAN MICROWAVE INTEGRATED CIRCUITS CONFERENCE (EUMIC) 305 - 308 2015年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
We propose a flexible and low-latency cascaded fiber-wireless system for future mobile fronthauling using seamless combination of fiber-optic and millimeter-wave links. Successful transmission of intraband and interband carrier aggregation LTE-A signals over the system is experimentally confirmed. Satisfactory performance is achieved owing to the use of a high-quality optical millimeter-wave signal generation technique at the transmitter and a proposed high-performance self-homodyne detection at the receiver.
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Bidirectional Transmission of LTE-A Carrier Aggregation Signal over a Seamless Fiber-Wireless System in W-Band 査読あり
Pham Tien Dat, Atsushi Kanno, Tetsuya Kawanishi
2015 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXHIBITION (OFC) 2015年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
We present a high-speed and low-latency seamless fiber-millimeter-wave system for future mobile front-haul networks. The bidirectional transmission of a downlink interband and an uplink intraband carrier aggregation LTE-A signal over the system is successfully demonstrated.
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Pure Single-Sideband Modulation Using High Extinction-Ratio Parallel Mach-Zehnder Modulator with Third-Order Harmonics Superposition Technique 査読あり
Yuya Yamaguchi, Atsushi Kanno, Tetsuya Kawanishi, Masayuki Izutsu, Hirochika Nakajima
2015 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO) 2015年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
We demonstrate high spurious suppression ratio single-sideband modulation by a high extinction-ratio parallel Mach-Zehnder modulator. An electrical third-order nonlinearity suppression technique can enhance the suppression ratio as high as 47 dB.
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Experimental Evaluation of the Time and Frequency Crosstalk Dependency in a 7-Core Multi-Core Fiber 査読あり
Ruben S. Luis, Benjamin J. Puttnam, Werner Klaus, Jose Manuel Delgado Mendinueta, Yoshinari Awaji, Naoya Wada, Atsushi Kanno, Tetsuya Kawanishi, Tetsuya Nakanishi, Tetsuya Hayashi, Takashi Sasaki
2015 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXHIBITION (OFC) 2015年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
We experimentally evaluate the time-varying crosstalk frequency response of a multicore fiber. Our findings suggest that dynamically adaptive transmission would be able to exploit this behavior, to improve the performance of crosstalk-limited links.
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Dynamic small-signal chirp characteristics of external and integrated modulators 査読あり
Ukrit Mankong, Praimezt Mekbungwan, Keizo Inagaki, Atsushi Kanno, Tetsuya Kawanishi
2015 INTERNATIONAL TOPICAL MEETING ON MICROWAVE PHOTONICS (MWP) 2015年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
We demonstrate that our recently proposed chirp measurement technique can be applied to the measurement and visualization of the small-signal dynamic chirp characteristics of modulators in vector space for the first time. Both discrete modulators and those integrated in externally modulated laser modules can be characterized by this method. The results agree with existing method to the first order approximation, whilst dynamic chirp change can also be measured during amplitude transition.
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Bias free operational 107-Gbaud ultra-fast photodetector 査読あり
T. Umezawa, K. Akahane, N. Yamamoto, A. Kanno, T. Kawanishi
ECOC 2015 41ST EUROPEAN CONFERENCE ON OPTICAL COMMUNICATION 2015年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
We designed a high-baud-rate UTC photodetector without a bias circuit for the first time. The photodetector's wideband frequency response over 100 GHz and clear eye diagrams up to 107 Gbaud were confirmed at 0 V. Bit error rate is discussed for 56 Gbaud and 107 Gbaud.
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FIBER-REMOTED 96-GHz RADAR SYSTEM 査読あり
Atsushi Kanno, Tetsuya Kawanishi
2015 IEEE AVIONICS AND VEHICLE FIBER-OPTICS AND PHOTONICS CONFERENCE (AVFOP) 59 - 60 2015年
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High-Speed and Low-Latency Front-haul System for Heterogeneous Wireless Networks Using Seamless Fiber-Millimeter-Wave 査読あり
Pham Tien Dat, Atsushi Kanno, Tetsuya Kawanishi
2015 IEEE INTERNATIONAL CONFERENCE ON COMMUNICATIONS (ICC) 994 - 999 2015年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
We propose a novel high-capacity and low-latency front-haul system for small cells-based heterogeneous wireless networks. We experimentally demonstrate a proof-of-concept seamless convergence of radio-over-fiber (RoF) and millimeter-wave (MMW) system at 90 GHz for high-speed wireless signal transmission. Simultaneous transmission and demodulation of standard-compliant very-high-throughput WLAN IEEE 802.11ac and high-speed LTE-A signals over the system are successfully confirmed for the downlink direction. Satisfactory transmission performance over the converged 10-km RoF and a 5-m 90-GHz wireless link is achieved. The measured root-mean-square error vector magnitude is much better than the requirement defined by the standards.
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Optical Frequency-Interleaving Full-Duplex Technique for Fiber-Optic Transmission of 96-GHz-Band Frequency-Modulated Continuous-Wave Downlink Signal and 10-Gb/s On-Off-Keying Uplink Signal 査読あり
Toshiaki Kuri, Atsushi Kanno, Tetsuya Kawanishi
2015 OPTO-ELECTRONICS AND COMMUNICATIONS CONFERENCE (OECC) 2015年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
An optical frequency-interleaving full-duplex technique for fiber-optic transmission of 96-GHz-band frequency-modulated continuous-wave downlink signal and 10-Gb/s on-off-keying uplink signal is newly proposed. The proposed full-duplexing technique with a flexible wavelength channel selector is experimentally demonstrated.
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5G TRANSPORT AND BROADBAND ACCESS NETWORKS: THE NEED FOR NEW TECHNOLOGIES AND STANDARDS 査読あり
Pham Tien Dat, Atsushi Kanno, Naokatsu Yamamoto, Tetsuya Kawanishi
2015 ITU Kaleidoscope: Trust in the Information Society (K-2015) 159 - 166 2015年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
In addition to new radio technologies, end-to-end transport networks will play a vital role in future 5G (and beyond) networks. In particular, access transport networks connecting radio access with core networks are of critical importance. They should be able to support massive connectivity, super high data rates, and real time services in a ubiquitous environment. To attain these targets, transport networks should be constructed on the basis of a variety of technologies and methods, depending on application scenarios, geographical areas, and deployment models. In this paper, we present several technologies, including analog radio-over-fiber transmission, intermediate-frequency-over-fiber technology, radio-on-radio transmission, and the convergence of fiber and millimeter-wave systems, that can facilitate building such effective transport networks in many use cases. For each technology, we present the system concept, possible application cases, and some demonstration results. We also discuss potential standardization and development directions so that the proposed technologies can be widely used.
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High Conversion Gain, Low Power Consumption W-Band Photoreceiver Integrated with UTC-PD and InP-PHEMT Amplifier 査読あり
T. Umezawa, K. Akahane, A. Kanno, N. Yamamoto, K. Kashima, T. Kawanishi
2015 INTERNATIONAL TOPICAL MEETING ON MICROWAVE PHOTONICS (MWP) 2015年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
In this study, we successfully fabricated a W-band high-power photoreceiver with high output power and low power consumption. This W-band photoreceiver was integrated with a bias-free uni-travelling carrier photodetector (UTC-PD) and an InP high electron mobility transistor (PHEMT) amplifier for the first time. An ultrabroad 3 dB bandwidth beyond 110 GHz in an UTC-PD and maximum oscillation frequency of 320 GHz in a PHEMT low-noise amplifier were used for this hybrid integration. At 109 GHz, a high radio frequency output power of +10 dBm, high transimpedance gain of 828 boxed times, and low power consumption of 67 mW was achieved in an optical-electrical converting process.
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Fiber-remoted 20-Gbaud QPSK transmission at 300 GHz 査読あり
Atsushi Kanno, Norihiko Sekine, Iwao Hosako, Tetsuya Kawanishi, Yuki Yoshida, Ken-ichi Kitayama
2015 INTERNATIONAL TOPICAL MEETING ON MICROWAVE PHOTONICS (MWP) 2015年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
300-GHz multilevel signal transmission over optical fibers and air is demonstrated using advanced optical communication technology including optical frequency comb generation. Local oscillator signal transport over optical fibers to optical-terahertz converters removes the need for setting any terahertzcapable oscillators in the converters. This fiber-remoted configuration with seamless conversion between the optical and terahertz signals is compatible with high-speed terahertz backhaul and fronthaul links.
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Digital coherent W-band MIMO radio-over-fiber systems 査読あり
Ken-Ichi Kitayama, Yuki Yoshida, Atsushi Kanno, Tetsuya Kawanishi
Signal Processing in Photonic Communications, SPPCom 2015 262 2015年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：Optical Society of America (OSA)
We present digital coherent W-band MIMO RoF system and its collected digital signal processing for optical and wireless signal. Its high resilience of dual optical wireless link will find immediate application to disaster recovery. © 2015 OSA.
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Coherent detection in self-homodyne systems with single and multi-core transmission 査読あり
Ruben S. Luís, Benjamin J. Puttnam, José-Manuel D. Mendinueta, Ali Shahpari, Zoran Vujičić, Werner Klaus, Jun Sakaguchi, Yoshinari Awaji, Antonio Teixeira, Naoya Wada, Tetsuya Kawanishi, Atsushi Kanno
Proceedings of SPIE - The International Society for Optical Engineering 9389 2015年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：SPIE
This work reviews the latest advancements in coherent self-homodyne detection (SHD) using signals with polarizationor space-multiplexed pilot tones (PTs) originating from the same light source, towards the implementation of low-cost coherent receivers. The coherency between signals and PTs drastically reduces laser linewidth requirements, enabling the use of high-order modulation formats with low-cost DFB lasers. In this work, we revise the application of SHD in high-capacity space-division multiplexed links using multi-core fibers, outlining optical signal-to-noise ratio, skew and phase noise requirements of such systems. Furthermore, we evaluate the application of SHD for the implementation of laser-less optical network units in passive optical networks, as well as recent developments in digital SHD techniques.
DOI： 10.1117/12.2081686
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Broadband Millimeter-Wave Electro-Optic Modulator Using Multi Patch Antennas for Pico-Cell Radar Networks 査読あり
Yusuf Nur Wijayanto, Atsushi Kanno, Tetsuya Kawanishi
INTERNATIONAL SEMINAR ON PHOTONICS, OPTICS, AND ITS APPLICATIONS (ISPHOA 2014) 9444 2015年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：SPIE-INT SOC OPTICAL ENGINEERING
An electro-optic (EO) modulator using multi patch antennas is proposed for broadband millimeter-wave bands in pico-cell radar networks. The proposed device is composed of multi patch antennas with a gap fabricated on a LiNbO3 crystal bonded with a low-k dielectric material. Multiple millimeter-wave operational frequencies can be received by the multi patch antennas and converting directly to lightwave signals through the Pockel effects of the LiNbO3 crystal. By adjusting the metal patch size for receiving with relatively close millimeter-wave frequencies, the bandwidth of the EO modulator can be enlarged. Based on that, bandwidth of over 30% in millimeter-wave bands can be achieved using the proposed device.
DOI： 10.1117/12.2075142
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Analog signal transmission by FPGA-based pseudo-delta-sigma modulator 査読あり
Atsushi Kanno, Tetsuya Kawanishi
2015 PHOTONICS CONFERENCE (IPC) 2015年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
We present a pseudo-delta-sigma modulator and demonstrate transmission using an advanced modulation. This digitally implemented transmitter helps in reducing the complexity at the receiver and realizing waveform transport over a digital optical network.
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Advanced Photonics for Wired and Wireless Seamless Networks 査読あり
Tetsuya Kawanishi, Atsushi Kanno, Pham Tien Dat, Atsushi Matsumoto, Naokatsu Yamamoto
2015 17th International Conference on Transparent Optical Networks (ICTON) 2015年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
Wired and wireless seamless networks comprised of optical-fiber and radio-wave links can provide high-speed, resilient, and flexible broadband services, one of the important requirements for which is the precise and highspeed control of light waves based on advanced photonic technologies such as digital coherent detection, highspeed electro-optic conversion, and radio-over-fiber. In this paper, we focus on advanced photonic devices for optical and radio-wave links and on the expected performance and function of seamless networks.
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300-GHz Versatile Transceiver Front-End for Both Communication and Imaging 査読あり
A. Kanno, N. Sekine, Y. Uzawa, I. Hosako, T. Kawanishi
2015 40TH INTERNATIONAL CONFERENCE ON INFRARED, MILLIMETER AND TERAHERTZ WAVES (IRMMW-THZ) 2015年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
Envelope-detector-based transceiver configurations are useful for both digital signal transmission and radar systems in the terahertz band. A dual-purpose transceiver is demonstrated using a 1-Gb/s on-off keying signal and 12.5-GHz-bandwidth frequency-modulated continuous-wave radar.
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300-GHz FM-CW radar system by optical frequency comb generation 査読あり
Atsushi Kanno, Norihiko Sekine, Yoshinori Uzawa, Iwao Hosako, Tetsuya Kawanishi
2015 45TH EUROPEAN MICROWAVE CONFERENCE (EUMC) 558 - 561 2015年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
In this paper, we demonstrate a 300-GHz FM-CW radar using optical modulation technology. An optical frequency comb based on the optical modulation is utilized as a broadband frequency multiplier with a factor of 12. At a central frequency of 300 GHz, we generate a 12-GHz-bandwidth FM-CW signal with a pulse duration of 10 mu s, realizing a precise ranging with a resolution of several centimeters. We show that the optical frequency comb generator is capable of generating larger bandwidth FM-CW signals.
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20-Gb/s QPSK Transmission Over 10-km-long Holey Fiber Using a Wavelength Tunable Quantum Dot Light Source in O-band 査読あり
Akihiro Murano, Fumiya Yagi, Naokatsu Yamamoto, Atsushi Kanno, Tetsuya Kawanishi, Hideyuki Sotobayashi
OPTICAL METRO NETWORKS AND SHORT-HAUL SYSTEMS VII 9388 2015年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：SPIE-INT SOC OPTICAL ENGINEERING
We successfully demonstrate 20-Gb/s quadrature phase-shift keying (QPSK) signal transmission. The transmission was carried out over endlessly single-mode holey fiber in the waveband of 1276.02-1304.26 nm, whose bandwidth of 5.09-THz is broader than the traditional C-band. A wavelength-tunable quantum dot (QD) laser with broad wavelength tunability helps realize bandwidth availability. A single InAs/InGaAs QD optical gainchip was grown using a sandwiched sub-nanometer separator technique in the wavelength of 1.3-mu m band. Using this gain chip, the QD light source has good wavelength stability, compactness and wavelength tunablility. The measured transmission results show bit error rates within a forward error correction limit of 2x10(-3) using intradyne coherent detection with offline digital signal processing. In this study, it is expected that abundant frequency resources such as the O-band are coherently enhanced by the use of a large number of wavelength channels by effectively using the QD-laser.
DOI： 10.1117/12.2078118
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Waveform over fiber: DSP-aided coherent fiber-wireless transmission using millimeter and terahertz waves 査読あり
Atsushi Kanno, Pham Tien Dat, Toshiaki Kuri, Iwao Hosako, Tetsuya Kawanishi, Yuki Yoshida, Ken-ichi Kitayama
BROADBAND ACCESS COMMUNICATION TECHNOLOGIES IX 9387 2015年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：SPIE-INT SOC OPTICAL ENGINEERING
In this paper, we describe seamless networks based on millimeter and terahertz wave radio links using waveform transfer over optical fibers. Coherent optical transceivers with digital signal processing provide transmission impairment compensation in both optical and radio sections, where devices for the signal processing are implemented at edges of the links. Waveforms, which include the modulation formats, the symbol rates, etc., are maintained in the entire links, to reduce transmission latency and energy consumption in the network.
DOI： 10.1117/12.2077056
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Widely linear EDFA for Analog Radio-over-Fiber Transmission over a Passive Optical Network Configuration 査読あり
Masaki Shiraiwa, Atsushi Kanno, Yoshinari Awaji, Noya Wada, Tetsuya Kawanishi, Ken-ichi Kitayama
2015 PHOTONICS CONFERENCE (IPC) 2015年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
An analog radio-over-fiber signal transmission over a passive-optical-network using a widely-linear erbium-doped fiber amplifier with a capability of 256 subscribers is demonstrated with an observed error vector magnitude less than 4% rms.
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Zero-Bias Operational Ultra-Broadband UTC-PD above 110 GHz for High Symbol Rate PD-Array in High-Density Photonic Integration 査読あり
T. Umezawa, K. Akahane, N. Yamamoto, A. Kanno, K. Inagaki, T. Kawanishi
2015 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXHIBITION (OFC) 2015年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
We have successfully developed a zero-bias operational ultra-broadband uni-travelingcarrier photodiode (UTC-PD) with a frequency bandwidth above 110 GHz using a low carrier concentration of 3 x 10(14) cm(-3) in the carrier collection layer.
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High-performance PIN photodetector at 67 GHz and beyond for radio over fiber applications 査読あり
T. Umezawa, K. Akahane, N. Yamamoto, A. Kanno, T. Kawanishi
TERAHERTZ, RF, MILLIMETER, AND SUBMILLIMETER-WAVE TECHNOLOGY AND APPLICATIONS VIII 9362 2015年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：SPIE-INT SOC OPTICAL ENGINEERING
High-performance photodetectors (PDs) for radio over fiber (RoF) applications over 60 GHz were designed and fabricated. The RF output was investigated while a high linearity was observed for two designs: a low carrier concentration InGaAs absorption layer in a PIN structure and a low carrier concentration collection layer in a unitravelling-carrier (UTC) structure. The RF output performances of both PIN and UTC structures were studied at 67 GHz and 100 GHz respectively. High photocurrent densities could be obtained from both structures (21.7 kA/cm(2) in the PIN structure and 35.4 kA/cm(2) in the UTC structure). The PIN structure exhibited a slightly higher current density of 1.6 times than the UTC structure. The frequency response of the UTC-PD exhibited excellent flatness up to 110 GHz, with a 3 dB bandwidth beyond 110 GHz. In addition, maximum RF output powers of +6.8 dBm at 67 GHz and -5 dBm at 100 GHz was successfully obtained. The space charge effect could be ruled out for the output linearity, but avoiding overheating in the p-contact metal had to be considered. By modifying impedance matching circuit designs, the maximum RF output power level of 3 dB can be improved.
DOI： 10.1117/12.2078616
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Zero-Bias Operational Ultra-Broadband UTC-PD above 110 GHz for High Symbol Rate PD-Array in High-Density Photonic Integration 査読あり
T. Umezawa, K. Akahane, N. Yamamoto, A. Kanno, K. Inagaki, T. Kawanishi
2015 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXHIBITION (OFC) 2015年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
We have successfully developed a zero-bias operational ultra-broadband uni-travelingcarrier photodiode (UTC-PD) with a frequency bandwidth above 110 GHz using a low carrier concentration of 3 x 10(14) cm(-3) in the carrier collection layer.
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Widely linear EDFA for Analog Radio-over-Fiber Transmission over a Passive Optical Network Configuration 査読あり
Masaki Shiraiwa, Atsushi Kanno, Yoshinari Awaji, Noya Wada, Tetsuya Kawanishi, Ken-ichi Kitayama
2015 PHOTONICS CONFERENCE (IPC) 2015年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
An analog radio-over-fiber signal transmission over a passive-optical-network using a widely-linear erbium-doped fiber amplifier with a capability of 256 subscribers is demonstrated with an observed error vector magnitude less than 4% rms.
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Waveform over fiber: DSP-aided coherent fiber-wireless transmission using millimeter and terahertz waves 査読あり
Atsushi Kanno, Pham Tien Dat, Toshiaki Kuri, Iwao Hosako, Tetsuya Kawanishi, Yuki Yoshida, Ken-ichi Kitayama
BROADBAND ACCESS COMMUNICATION TECHNOLOGIES IX 9387 2015年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：SPIE-INT SOC OPTICAL ENGINEERING
In this paper, we describe seamless networks based on millimeter and terahertz wave radio links using waveform transfer over optical fibers. Coherent optical transceivers with digital signal processing provide transmission impairment compensation in both optical and radio sections, where devices for the signal processing are implemented at edges of the links. Waveforms, which include the modulation formats, the symbol rates, etc., are maintained in the entire links, to reduce transmission latency and energy consumption in the network.
DOI： 10.1117/12.2077056
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Optical-Network-Connected Multi-Channel 96-GHz-Band Distributed Radar System 査読あり
Atsushi Kanno, Toshiaki Kuri, Tetsuya Kawanishi
PASSIVE AND ACTIVE MILLIMETER-WAVE IMAGING XVIII 9462 2015年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：SPIE-INT SOC OPTICAL ENGINEERING
The millimeter-wave (MMW) radar is a promising candidate for high-precision imaging because of its short wavelength and broad range of available bandwidths. In particular in the frequency range of 92-100 GHz, which is regulated for radiolocation, an atmospheric attenuation coefficient less than 1 dB/km limits the imaging range. Therefore, a combination of MMW radar and distributed antenna system directly connected to optical fiber networks can realize both high-precision imaging and large-area surveillance. In this paper, we demonstrate a multi-channel MMW frequency-modulated continuous-wave distributed radar system connected to an analog radio-over-fiber network.
DOI： 10.1117/12.2085267
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Optical-Electrical Hybrid Signal Equalizer For Ultra-High-Speed Transmission 査読あり
Shinya Maruyama, Kazunari Tomishige, Atsushi Kanno, Tetsuya Kawanishi, Hideyuki Sotobayashi
OPTICAL METRO NETWORKS AND SHORT-HAUL SYSTEMS VII 9388 2015年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：SPIE-INT SOC OPTICAL ENGINEERING
We demonstrate an optical-electrical hybrid equalizer, which comprises an optical domain equalizer fabricated using optical filter banks and an electrical filter in a digital domain by a digital signal processing, to experimentally demodulate degraded 40-Gbaud quadrature phase-shift keying (QPSK) signal. The optical signal-to-noise ratio (OSNR) required for a BER of 1 x 10(-3) is improved to 7 dB without an optical equalizer (OEQ) under the back-to-back condition. The fluctuation in the OEQ strength between 0-6 dB will not affect signal quality significantly. The signal degradation caused by the frequency response of devices was minimized using by the hybrid equalizer.
DOI： 10.1117/12.2078117
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Optical Frequency-Interleaving Full-Duplex Transmission of 96-GHz-Band Frequency-Modulated Continuous-Wave Downlink Signal and 10-Gb/s On-Off-Keying Uplink Signal 査読あり
Toshiaki Kuri, Atsushi Kanno, Tetsuya Kawanishi
2015 PHOTONICS CONFERENCE (IPC) 2015年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
An optical frequency-interleaving full-duplex transmission of 96-GHz-band frequency-modulated continuous-wave downlink signal and 10-Gb/s on-off-keying uplink signals is investigated, The proposed full-duplexing transmission with a flexible wavelength channel selector over 10-km fiber-optic link is experimentally demonstrated.
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Optical FM-CW signal generation for a terahertz radar system by higher-order optical modulation
Atsushi Kanno, Norihiko Sekine, Yoshinori Uzawa, Iwao Hosako, Tetsuya Kawanishi
Progress in Electromagnetics Research Symposium 2015-January 2287 - 2291 2015年
掲載種別：研究論文（国際会議プロシーディングス）
In this paper, optical frequency-chirped signal generation using a high-order optical modulation technique is investigated. An optical frequency comb generator based on optical modulation is utilized as a frequency multiplier. Its multiplication factor of 12 allows designing a 300GHz terahertz-band radar system. An input signal at the central frequency of 25GHz with a chirp bandwidth of 1GHz, 2GHz, and 3GHz provides 6GHz, 12GHz, and 18GHz optical signals at 6th-order harmonics, respectively. A frequency separation of the +6th and -6th-order components is equal to 300 GHz, with a chirp bandwidth of 12GHz and 24GHz. The proposed technique can be used to design high-precision imaging systems.
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Optical Comb-based Versatile Wavelength Division Multicasting Add-drop Node for Efficient WDM Networks 査読あり
Jun Sakaguchi, Takahide Sakamoto, Atsushi Kanno, Yoshinari Awaji, Naoya Wada, Tetsuya Kawanishi
2015 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXHIBITION (OFC) Th2A.6 2015年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
We demonstrate a robust and modulation-format-transparent multicasting wavelength converter based on a Mach-Zehnder optical comb generator. All the wavelength-converted channels show maximum 0,6 dB and 1.1 dB penalties for QPSK and 16QAM signals, respectively.
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Millimetre-wave Electro-Optic Modulator with Quasi-Phase-Matching Array of Orthogonal-Gap-Embedded Patch-antennas on Low-k Dielectric Material 査読あり
Yusuf Nur Wijayanto, Atsushi Kanno, Hiroshi Murata, Sinya Nakajima, Tetsuya Kawanishi, Yasuyuki Okamura
2015 INTERNATIONAL CONFERENCE ON PHOTONICS, OPTICS AND LASER TECHNOLOGY (PHOTOPTICS), VOL 2 5 - 13 2015年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
In Fibre-Wireless (Fi-Wi) links, conversion devices between wireless microwave/millimetre-wave and lightwave signals are required. In this paper, we propose a wireless millimetre-wave-lightwave signal converter using an electro-optic (EO) modulator with Quasi-Phase-Matching (QPM) array of orthogonal-gap-embedded patch-antennas on a low-k dielectric material. Wireless millimetre-wave signals can be received and converted directly to lightwave signals using the proposed device. It can be operated with no external power supply and extremely-low millimetre-wave losses. The orthogonal-gap-embedded patch-antennas can be used for receiving dual-linearized or circular polarizations of wireless millimetre-wave signals. The QPM array structure can be adopted for enhancing modulation efficiency by transit-time effects consideration. Structure, analysis, and experimental of the proposed device are discussed for 40GHz operational millimetre-wave bands.
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Microstrip Patch Antennas Feed to Optical Waveguides in Electro-Optic Modulator for Millimeter-Wave Radar System 査読あり
Y. N. Wijayanto, A. Kanno, T. Kawanishi, H. Murata, Y. Okamura
2015 IEEE MTT-S INTERNATIONAL MICROWAVE SYMPOSIUM (IMS) 2015年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
Microstrip patch antennas feed to optical waveguides in an electro-optic (EO) modulator are proposed for millimeter-wave radar system. Reflected millimeter-wave radar signals can be received by the microstrip patch antennas and converted directly to lighwave signals through EO modulation. The lightwave signals can be distributed using low loss optical fibers. Millimeter-wave loss and distortion are almost negligible. Device analysis and experiment for 40GHz millimeter-wave bands are discussed.
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Metamaterial Electric-LC Resonators on Electro-Optic Modulator for Wireless THz-Lightwave Signal Conversion 査読あり
Yusuf Nur Wijayanto, Atsushi Kanno, Tetsuya Kawanishi
2015 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO) 2015年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
Metamaterial electric-LC resonators on an electro-optic modulators are proposed for wireless THz-lightwave signal conversion. Strong electric field can be induced on the resonators by wireless THz irradiation and converted to lightwave signals through electro-optic modulation.
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Metamaterial Antenna Integrated to LiNbO3 Optical Modulator for Millimeter-Wave-Photonic Links 査読あり
Y. N. Wijayanto, A. Kanno, A. A. Fathnan, P. Daud, T. Kawanishi, D. Mahmudin, N. Yamamoto
2015 INTERNATIONAL SYMPOSIUM ON ANTENNAS AND PROPAGATION (ISAP) 2015年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
We report current research progress on a metamaterial antenna integrated to an optical modulator for millimeter-wave-photonic links. The metamaterial antenna is composed by an array of electric-LC resonators on a LiNbO3 optical crystal. Large millimeter-wave electric field is induced across the capacitive gaps of the resonators due to free-space millimeter-wave irradiation. Optical modulation through Pockels effects can be obtained when light propagates along the capacitive gaps. The integrated device is operated effectively by considering interaction between millimeter-wave and lightwave electric fields along the capacitive gaps. Basic operations of the integrated device for 90GHz millimeter-wave bands are reported and discussed. Optical sidebands with carrier-to-sideband ratio of about -60dB by millimeter-wave irradiation power of similar to 20mW can be experimentally measured using optical spectrum analyzer.
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Long Distance Transmission in a Multi-Core Fiber with Self-Homodyne Detection 査読あり
Benjamin J. Puttnam, Ruben S. Luis, Jose-Manuel Delgado Mendinueta, Jun Sakaguchi, Werner Klaus, Yoshinari Awaji, Naoya Wada, Atsushi Kanno, Tetsuya Kawanishi
2015 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXHIBITION (OFC) Th1D.5 2015年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
We investigate long-distance space-division multiplexed self-homodyne transmission in two synchronized recirculating loops. Compared to intradync detection, PDM-64QAM transmission distance with DFB lasers is doubled and 6800km PDM-QPSK transmission, within 1dB of intradyne detection, is achieved.
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High-speed Optical and Millimeter-wave Wireless Link for Disaster Recovery 査読あり
Ken-ichi Kitayama, Yuki Yoshida, Yuya Yamaguchi, Hirochika Nakajima, Kosuke Nishimura, Abdelmoula Bekkali, Masayuki Oishi, Naoyasu Kamiya, Keiji Tanaka, Hidenori Iwai, Kazuya Ota, Norihiko Sato, Yoichi Oikawa, Kazukiyo Joshin, Nobuhiko Shibagaki, Kaoru Higuma, Satoshi Oikawa, Junichiro Ichikawa, Atsushi Kanno, Tetsuya Kawanishi
2015 IEEE GLOBECOM WORKSHOPS (GC WKSHPS) 2015年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
A government-funded R&D program aiming at a resilient optical and millimeter-wave wireless link for a novel span protection scheme in a disaster recovery is presented. We also describe the key enabling technologies of both optical and wireless sub-systems and devices, including MIMO radio-over-fiber system, optical two-tone generation, and the transceiver and power amplifier in W-band.
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High-Spectral Efficiency Millimeter Wave-over-Fiber System for Future Mobile Fronthaul 査読あり
Pham Tien Dat, Atsushi Kanno, Keizo Inagaki, Naokatsu Yamamoto, Tetsuya Kawanishi
ECOC 2015 41ST EUROPEAN CONFERENCE ON OPTICAL COMMUNICATION 2015年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
We present a high-spectral efficiency fronthaul system for the transmission of millimeter-wave and multiple-input multiple-output (MIMO) signals in future mobile networks. The transmission of an interband carrier aggregation and a 2 x 2 MIMO LTE-A signal over the system is successfully demonstrated.
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90 GHz OFDM 16QAM signal transmission over IF over fiber link
Atsushi Kanno, Pham Tien Dat, Tetsuya Kawanishi
Proceedings 2015 European Conference on Lasers and Electro-Optics - European Quantum Electronics Conference, CLEO/Europe-EQEC 2015 2015年
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Compact 60GHz hybrid integrated photoreceiver module with 1.5-μm InAs quantum dot SOA
T. Umezawa, K. Akahane, N. Yamamoto, A. Kanno, T. Kawanishi
Progress in Electromagnetics Research Symposium 2015- 2292 - 2295 2015年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：Electromagnetics Academy
We have developed a 60-GHz hybrid integrated photoreceiver module using a quantum-dotbased optical semiconductor amplifier and a high-speed PIN photodetector for high-baud-rate opticalfiber communications. A high responsivity of 25A/W and a high sensitivity of-20.5 dBm were achieved.
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On the MIMO channel rank deficiency in W-band MIMO RoF transmissions.
S. Inudo, Yuki Yoshida, Atsushi Kanno, Pham Tien Dat, Tetsuya Kawanishi, Ken-ichi Kitayama
Optical Fiber Communications Conference and Exhibition(OFC) 1 - 3 2015年
掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
その他リンク： https://dblp.uni-trier.de/db/conf/ofc/ofc2015.html#InudoYKDKK15
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Optical frequency-interleaving full-duplex technique for fiber-optic transmission of millimeter-wave-band frequency-modulated continuous-wave downlink signal and 10-Gb/s on-off-keying uplink signal
T. Kuri, A. Kanno, T. Kawanishi
Progress in Electromagnetics Research Symposium 2015- 2276 - 2280 2015年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：Electromagnetics Academy
An optical frequency-interleaving full-duplex technique for fiber-optic transmission of millimeter-wave-band frequency-modulated continuous-wave downlink signal and 10-Gb/s on-off-keying uplink signals is newly proposed. The proposed full-duplexing technique with a flexible wavelength channel selector is experimentally demonstrated.
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Optically driven 90-GHz radar system using broadband IQ downconverter 査読あり
Atsushi Kanno, Tetsuya Kawanishi
2014 IEEE Avionics, Fiber-Optics and Photonics Technology Conference, AVFOP 2014 37 - 38 2014年12月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：Institute of Electrical and Electronics Engineers Inc.
A millimeter-wave (MMW) radar system is promising for high-precision imaging because of its short wavelength and broad range of available bandwidths [1]. Particularly in the frequency range of 92-100 GHz, where the US, the EU, and Japan allow radiolocation, an atmospheric attenuation coefficient of 0.4 dB/km in standard atmospheric conditions limits the imaging range. Thus, a distributed radar system directly connected to optical fiber networks realizes both high-precision imaging and a large imaging area. A frequency-modulated continuous-wave (FM-CW) radar system based on an optical modulation technique has already been reported and evaluated in the optical domain [2]. In this paper, we evaluate the precision of a broadband FM-CW radar system operated with optical modulation technology. A broadband in-phase/quadrature (IQ) mixer can directly convert to intermediate frequency signals with a common-mode rejection feature [3].
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Performance evaluation of wavelength division multiplexed radio-over-fiber de-multiplexer for 96-GHz-band frequency-modulated continuous-wave signal delivery 査読あり
Toshiaki Kuri, Atsushi Kanno, Tetsuya Kawanishi
2014 IEEE Avionics, Fiber-Optics and Photonics Technology Conference, AVFOP 2014 23 - 24 2014年12月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：Institute of Electrical and Electronics Engineers Inc.
We have experimentally evaluated the performance of a newly developed WDM RoF de-multiplexer prototype with 200-GHz-spaced 5-channel WDM RoF signal carrying each 96-GHz-band FM-CW signal and showed the usefulness. Thanks to the lightness property of fiber optics, this technology will be applicable for an on-board mm-wave-band signal delivery system in an aircraft, such as a FM-CW distributed aperture system for synthetic aperture radar.
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Z-cut LiNbO3 optical modulator using patch-antenna with orthogonal-gaps for millimeter-wave radar applications 査読あり
Y. N. Wijayanto, A. Kanno, T. Kawanishi, H. Murata, Y. Okamura
2014 International Topical Meeting on Microwave Photonics / the 9th Asia-Pacific Microwave Photonics Conference, MWP/APMP 2014 - Proceedings 192 - 195 2014年12月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：Institute of Electrical and Electronics Engineers Inc.
We propose z-cut LiNbO3 optical modulators using patch-antennas with orthogonal-gaps for millimeter-wave radar applications. They are fabricated on thin LiNbO3 crystals bonded with low-k dielectric materials. Large modulation efficiency and low noise response are obtainable.
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Direct chirp measurement in vector space of electroabsorption modulator 査読あり
Ukrit Mankong, Tanawant Tangmala, Keizo Inagaki, Kanno Atsushi, Tetsuya Kawanishi
2014 International Topical Meeting on Microwave Photonics / the 9th Asia-Pacific Microwave Photonics Conference, MWP/APMP 2014 - Proceedings 127 - 130 2014年12月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：Institute of Electrical and Electronics Engineers Inc.
We propose a novel method to measure chirp of an electro-absorption modulator in vector space due to intensity modulation at any frequency using optical homodyne quadrature demodulation technique. Chirp parameters are directly obtained in the small-signal vector space, enabling practical chirp assessment for advanced modulation optical transmission.
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Performance of a new burst-mode erbium-doped fiber amplifier for uplink radio-over-fiber signal transmission 査読あり
M. Shiraiwa, A. Kanno, T. Kuri, P. T. Dat, Y. Awaji, N. Wada, T. Kawanishi
2014 International Topical Meeting on Microwave Photonics / the 9th Asia-Pacific Microwave Photonics Conference, MWP/APMP 2014 - Proceedings 21 - 24 2014年12月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：Institute of Electrical and Electronics Engineers Inc.
We investigated the performance of the latest burst-mode erbium-doped fiber amplifier (BM-EDFA) for uplink transmission of radio-over-fiber signals by using the long-term evolution advanced format. The new BM-EDFA was designed to have high linearity in the high output power range. Compared with conventional EDFAs, we observed lower error vector magnitudes over a wide range of optical input power.
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Z-cut LiNbO3 optical modulator using patch-antenna with orthogonal-gaps for millimeter-wave radar applications 査読あり
Y. N. Wijayanto, A. Kanno, T. Kawanishi, H. Murata, Y. Okamura
2014 International Topical Meeting on Microwave Photonics / the 9th Asia-Pacific Microwave Photonics Conference, MWP/APMP 2014 - Proceedings 192 - 195 2014年12月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：Institute of Electrical and Electronics Engineers Inc.
We propose z-cut LiNbO3 optical modulators using patch-antennas with orthogonal-gaps for millimeter-wave radar applications. They are fabricated on thin LiNbO3 crystals bonded with low-k dielectric materials. Large modulation efficiency and low noise response are obtainable.
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Front-haul solutions for wireless access systems
Toshiaki Kuri, Atsushi Kanno, Tetsuya Kawanishi
Asia Communications and Photonics Conference, ACPC 2014 2014年11月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：Optical Society of America (OSA)
The definition of "mobile front-haul" discussed in ITU-T is introduced. "Radio-over-X" as a generalized concept of transmission systems collaborated with radio links and "modulationsymbol-format maintaining transmission" as an efficient transmission scheme are also newly proposed.
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Digital signal processing techniques for multi-core fiber transmission using self-homodyne detection schemes
José Manuel Delgado Mendinueta, Ruben S. Luís, Benjamin J. Puttnam, Jun Sakaguchi, Werner Klaus, Yoshinari Awaji, Naoya Wada, Atsushi Kanno, Tetsuya Kawanishi
European Signal Processing Conference 1880 - 1884 2014年11月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：European Signal Processing Conference, EUSIPCO
We discuss digital signal processing (DSP) techniques for self-homodyne detection (SHD), multi-core fiber (MCF) transmission links, and related technologies. We focus on exploiting the reduced phase noise of self-homodyne multi-core fiber (SH-MCF) systems to enable DSP resource savings and describe digital receiver architectures that mixes signal and local oscillator in the digital domain.
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Highly Sensitive Photodetector Using Ultra-High-Density 1.5-μm Quantum Dots for Advanced Optical Fiber Communications 査読あり
Toshimasa Umezawa, Kouichi Akahane, Naokatsu Yamamoto, Atsushi Kanno, Tetsuya Kawanishi
IEEE Journal of Selected Topics in Quantum Electronics 20 ( 6 ) 2014年11月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Institute of Electrical and Electronics Engineers Inc.
We have fabricated a high-density 1.5-μm quantum dot photodetector for advanced optical fiber communications and have found unique optical properties, including avalanche multiplication. The structure of the absorption layer had stacked InAs/InGaAlAs layers with a high density of 1 × 1012 cm-2, which consisted of strained 1.5-μm InAs quantum dots and a strain compensation layer of InGaAlAs. A three times larger absorption coefficient than the InGaAs layer, an avalanche multiplication effect, and a low dark current are reported with InAs quantum dot conditions.
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Highly Sensitive Photodetector Using Ultra-High-Density 1.5-mu m Quantum Dots for Advanced Optical Fiber Communications 査読あり
Toshimasa Umezawa, Kouichi Akahane, Naokatsu Yamamoto, Atsushi Kanno, Tetsuya Kawanishi
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS 20 ( 6 ) 2014年11月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
We have fabricated a high-density 1.5-mu m quantum dot photodetector for advanced optical fiber communications and have found unique optical properties, including avalanche multiplication. The structure of the absorption layer had stacked InAs/InGaAlAs layers with a high density of 1 x 10(12) cm(-2), which consisted of strained 1.5-mu m InAs quantum dots and a strain compensation layer of InGaAlAs. A three times larger absorption coefficient than the InGaAs layer, an avalanche multiplication effect, and a low dark current are reported with InAs quantum dot conditions.
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Broadband Frequency-Modulated Continuous-Wave Signal Generation by Optical Modulation Technique 査読あり
Atsushi Kanno, Tetsuya Kawanishi
JOURNAL OF LIGHTWAVE TECHNOLOGY 32 ( 20 ) 3566 - 3572 2014年10月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Optical frequency-modulated continuous-wave (FM-CW) signal generation with a bandwidth of 35 GHz and a pulse duration of 1 mu s in the range of 75-110 GHz is demonstrated with an optical frequency multiplier consisting of an optical modulator and optical filters. The FM-CW signal generator is used as a signal source for the surveillance of obstacles and debris in a large area by a distributed radar system connected to the optical fiber network. The system for millimeter-wave FM-CW signal generation is realized using the functions of a multi-frequency band and segmentation of the radar heads with several channels to avoid radio-frequency interference. The wavelength-division multiplexing technology with simple optical heterodyning aids in realizing these functions with high availability.
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High-Capacity Wireless Backhaul Network Using Seamless Convergence of Radio-over-Fiber and 90-GHz Millimeter-Wave 査読あり
Pham Tien Dat, Atsushi Kanno, Keizo Inagaki, Tetsuya Kawanishi
JOURNAL OF LIGHTWAVE TECHNOLOGY 32 ( 20 ) 3910 - 3923 2014年10月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
We propose and experimentally demonstrate a seamlessly converged radio-over-fiber (RoF) and millimeter-wave system at 90 GHz for high-speed wireless signal transmission. We successfully transmit and demodulate standard orthogonal frequency-division multiplexing-based wireless local access network (WLAN) signals, long term evolution eNB conformance test models, and long term evolution advanced signals over the system. Satisfactory transmission performance over the converged RoF and a 5-m 90-GHz wireless link is achieved. The measured root-mean-square error vector magnitude is well under the requirement defined by the standards. We also investigate the dependence of the transmission performance on the fiber length due to the effect of fiber dispersion and estimate the achievable wireless transmission distance. The estimated transmission range of both the fiber length and wireless link are sufficiently long for practical applications, such as mobile backhaul/fronthaul, wireless access network for WLAN signals. Possible solutions and the estimated transmission range are also discussed to use millimeter-wave and RoF system convergence for uplink transmission. The obtained results confirm the potential to use the system in future high-speed, small-cell mobile networks and in broadband wireless access networks.
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High-capacity self-homodyne PDM-WDM-SDM transmission in a 19-core fiber 査読あり
Benjamin J. Puttnam, Ruben Luis, Jose-Manuel Delgado-Mendinueta, Jun Sakaguchi, Werner Klaus, Yoshinari Awaji, Naoya Wada, Atsushi Kanno, Tetsuya Kawanishi
OPTICS EXPRESS 22 ( 18 ) 21185 - 21191 2014年09月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：OPTICAL SOC AMER
We investigate a high-capacity, space-division-multiplexed (SDM) transmission system using self-homodyne detection (SHD) in multicore fiber (MCF). We first investigate SHD phase noise cancellation with both kHz and MHz range linewidths for both quadrature-phase shift-keyed (QPSK) and 16 quadrature-amplitude modulation (16QAM) signals, finding that phase noise cancellation in SHD enabled transmission with MHz linewidth lasers that resulted in error floors when using intradyne detection. We then demonstrate a high throughput SHD transmission system using low-cost, MHz linewidth distributed feedback lasers. We transmit a CW pilot-tone on a single core of a 10.1 km MCF span with the remaining 18 cores used to transmit 125 wavelength-division multiplexed (WDM) QPSK and polarization-division-multiplexed (PDM)-QPSK signals with 50 GHz channel spacing at 25 GBd. For PDM transmission and assuming a 7% forward-error correction overhead this is equivalent 210 Tb/s transmission with a SE of 33.4 b/s/Hz. High-capacity transmission is achieved despite high inter-core crosstalk, broad transmitter linewidth and narrow channel spacing, showing that combining SHD with MCF enables high throughput, low-cost transmission in next-generation optical networks. (C) 2014 Optical Society of America
DOI： 10.1364/OE.22.021185
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Development of ultra-broadband UTC-PD module beyond 110 GHz without bias circuit
T. Umezawa, K. Akahane, N. Yamamoto, A. Kanno, T. Kawanishi
Optics InfoBase Conference Papers 2014年07月
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High extinction ratio characteristics of over 60 dB Mach-Zehnder modulator with asymmetric power-splitting Y-branches on X-cut Ti:LiNbO3 査読あり
Yuya Yamaguchi, Shinya Nakajima, Atsushi Kanno, Tetsuya Kawanishi, Masayuki Izutsu, Hirochika Nakajima
JAPANESE JOURNAL OF APPLIED PHYSICS 53 ( 8 ) 2014年07月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：IOP PUBLISHING LTD
We discuss the performance of Mach-Zehnder modulators with asymmetric power-splitting Y-branches theoretically and confirmed it experimentally. The output characteristics of the modulator depend on the relationship between the power splitting ratios of the front and the back Y-branches. Even if the modulator consists of two asymmetric Y-branches, we can achieve high-extinction-ratio operation, with an additional loss as compared with the ideal case, by tuning the splitting ratio of only one of the two Y-branches. The additional loss, however, is small in many cases because the asymmetry considered here is caused by fabrication errors. (C) 2014 The Japan Society of Applied Physics
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Self-homodyne detection in optical communication systems 査読あり
Benjamin J. Puttnam, Ruben S. Luís, José Manuel Delgado Mendinueta, Jun Sakaguchi, Werner Klaus, Yukiyoshi Kamio, Moriya Nakamura, Naoya Wada, Yoshinari Awaji, Atsushi Kanno, Tetsuya Kawanishi, Tetsuya Miyazaki
Photonics 1 ( 2 ) 110 - 130 2014年06月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：MDPI AG
We review work on self-homodyne detection (SHD) for optical communication systems. SHD uses a transmitted pilot-tone (PT), originating from the transmitter laser, to exploit phase noise cancellation at a coherent receiver and to enable transmitter linewidth tolerance and potential energy savings. We give an overview of SHD performance, outlining the key contributors to the optical signal-to-noise ratio penalty compared to equivalent intradyne systems, and summarize the advantages, differences and similarities between schemes using polarization-division multiplexed PTs (PDM-SHD) and those using space-division multiplexed PTs (SDM-SHD). For PDM-SHD, we review the extensive work on the transmission of advanced modulation formats and techniques to minimize the trade-offwith spectral efficiency, as well as recent work on digital SHD, where the SHD receiver is combined with an polarization-diversity ID front-end receiver to provide both polarization and modulation format alignment. We then focus on SDM-SHD systems, describing experimental results using multi-core fibers (MCFs) with up to 19 cores, including high capacity transmission with broad-linewidth lasers and experiments incorporating SDM-SHD in networking. Additionally, we discuss the requirement for polarization tracking of the PTs at the receiver and path length alignment and review some variants of SHD before outlining the future challenges of self-homodyne optical transmission and gaps in current knowledge.
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Self-homodyne detection in optical communication systems 査読あり
Benjamin J. Puttnam, Ruben S. Luís, José Manuel Delgado Mendinueta, Jun Sakaguchi, Werner Klaus, Yukiyoshi Kamio, Moriya Nakamura, Naoya Wada, Yoshinari Awaji, Atsushi Kanno, Tetsuya Kawanishi, Tetsuya Miyazaki
Photonics 1 ( 2 ) 110 - 130 2014年06月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：MDPI AG
We review work on self-homodyne detection (SHD) for optical communication systems. SHD uses a transmitted pilot-tone (PT), originating from the transmitter laser, to exploit phase noise cancellation at a coherent receiver and to enable transmitter linewidth tolerance and potential energy savings. We give an overview of SHD performance, outlining the key contributors to the optical signal-to-noise ratio penalty compared to equivalent intradyne systems, and summarize the advantages, differences and similarities between schemes using polarization-division multiplexed PTs (PDM-SHD) and those using space-division multiplexed PTs (SDM-SHD). For PDM-SHD, we review the extensive work on the transmission of advanced modulation formats and techniques to minimize the trade-offwith spectral efficiency, as well as recent work on digital SHD, where the SHD receiver is combined with an polarization-diversity ID front-end receiver to provide both polarization and modulation format alignment. We then focus on SDM-SHD systems, describing experimental results using multi-core fibers (MCFs) with up to 19 cores, including high capacity transmission with broad-linewidth lasers and experiments incorporating SDM-SHD in networking. Additionally, we discuss the requirement for polarization tracking of the PTs at the receiver and path length alignment and review some variants of SHD before outlining the future challenges of self-homodyne optical transmission and gaps in current knowledge.
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A semiconductor optical amplifier comprising highly stacked InAs quantum dots fabricated using the strain-compensation technique 査読あり
Kouichi Akahane, Naokatsu Yamamoto, Toshimasa Umezawa, Atsushi Kanno, Tetsuya Kawanishi
JAPANESE JOURNAL OF APPLIED PHYSICS 53 ( 4 ) 2014年04月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：IOP PUBLISHING LTD
A semiconductor optical amplifier was fabricated by incorporating highly stacked InAs quantum dots (QDs) as a gain media. Twenty InAs QD layers were successfully stacked through the strain-compensation technique, without any deterioration of crystal quality. A wide-range 1.55 mu m band gain was observed, and maximum gain reached 25 dB at 1530nm when the input power was below -40 dBm. (C) 2014 The Japan Society of Applied Physics
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Investigation of a 1.5-mu m-wavelength InAs-quantum-dot absorption layer for high-speed photodetector 査読あり
Toshimasa Umezawa, Kouichi Akahane, Atsushi Kanno, Tetsuya Kawanishi
APPLIED PHYSICS EXPRESS 7 ( 3 ) 2014年03月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：IOP PUBLISHING LTD
We investigated a 1.5-mu m-wavelength InAs-based quantum-dot (QD) absorption layer for high-speed and high-sensitivity photodetectors in advanced optical-fiber communications. The photodetector, which contained 20 stacked absorption layers of InAs/InGaAIAs QDs using the strain-compensation technique, exhibited a high absorption coefficient, avalanche multiplication effect, and a low dark current. It could operate at a low bias voltage for a p-type-intrinsic-n-type (PIN) diode structure. We expect that the 3-dB bandwidth at a low bias voltage would be approximately 50 GHz, and that the gain and bandwidth product in the avalanche multiplication region would be 150 GHz at a high bias voltage. (C) 2014 The Japan Society of Applied Physics
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Pump-linewidth-tolerant optical wavelength conversion for high-order QAM signals using coherent pumps 査読あり
Guo-Wei Lu, Andre Albuquerque, Benjamin J. Puttnam, Takahide Sakamoto, Miguel Drummond, Rogerio Nogueira, Atsushi Kanno, Satoshi Shinada, Naoya Wada, Tetsuya Kawanishi
OPTICS EXPRESS 22 ( 5 ) 5067 - 5075 2014年03月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：OPTICAL SOC AMER
Optical wavelength conversion (OWC) is expected to be a desirable function in future optical transparent networks. Since high-order quadrature amplitude modulation (QAM) is more sensitive to the phase noise, in the OWC of high-order QAM signals, it is crucial to suppress the extra noise introduced in the OWC subsystem, especially for the scenario with multiple cascaded OWCs. Here, we propose and experimentally demonstrate a pump-linewidth-tolerant OWC scheme suitable for high-order QAM signals using coherent two-tone pumps. Using 3.5-MHz-linewidth distributed feedback (DFB) lasers as pump sources, our scheme enables wavelength conversion of both 16QAM and 64QAM signals with negligible power penalty, in a periodically-poled Lithium Niobate (PPLN) waveguide based OWC. We also demonstrate the performance of pump phase noise cancellation, showing that such coherent two-tone pump schemes can eliminate the need for ultra-narrow linewidth pump lasers and enable practical implementation of low-cost OWC in future dynamic optical networks. (C)2014 Optical Society of America
DOI： 10.1364/OE.22.005067
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OSNR Penalty of Self-Homodyne Coherent Detection in Spatial-Division-Multiplexing Systems 査読あり
Ruben S. Luis, Benjamin J. Puttnam, Jose Manuel Delgado Mendinueta, Werner Klaus, Jun Sakaguchi, Yoshinari Awaji, Tetsuya Kawanishi, Atsushi Kanno, Naoya Wada
IEEE PHOTONICS TECHNOLOGY LETTERS 26 ( 5 ) 477 - 479 2014年03月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
This letter presents a general model for the performance of spatial-division-multiplexing systems using self-homodyne detection. The model is applicable to single and dual polarization square M-quadrature amplitude modulation (QAM) signals, assuming arbitrary signal and pilot tone optical signal-to-noise ratios. Its validity is demonstrated using a seven-core multicore fiber link with quadrature phase shift keying and 16-QAM signals, comparing the performance of self-homodyne detection with intradyne detection.
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Heterogeneous Wireless Signal Transmission Using Seamless Fiber and Millimeter-Wave Convergence 査読あり
Pham Tien Dat, Atsushi Kanno, Tetsuya Kawanishi
2014 INTERNATIONAL CONFERENCE ON ADVANCED TECHNOLOGIES FOR COMMUNICATIONS (ATC) 776 - 779 2014年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
We proposed a seamless fiber-millimeter-wave converged system suitable to provide a high-speed and low-latency transmission for heterogeneous wireless signals. Satisfactory performance is experimentally confirmed for simultaneous transmission of high-speed LTE-A and very-high-throughput WLAN IEEE 802.11ac signals over the proposed system.
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Frequency-Stabilized Terahertz-Signal Generation Using an Optical Frequency Comb and an Injection-Locking Technique 査読あり
Atsushi Kanno, Tetsuya Kawanishi
2014 INTERNATIONAL TOPICAL MEETING ON MICROWAVE PHOTONICS (MWP) AND THE 2014 9TH ASIA-PACIFIC MICROWAVE PHOTONICS CONFERENCE (APMP) 150 - 152 2014年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
An optical frequency comb source provides a terahertz-frequency-capable optical two-tone signal with an enhancement of the optical signal-to-noise ratio using an injection-locking technique. No phase-noise degradation between the signal with and without injection locking has been observed.
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Frequency-Quadruple Optical Two-Tone Signal Generation Using Integrated High Extinction-Ratio Mach-Zehnder Modulator 査読あり
Yuya Yamaguchi, Shinya Nakajima, Atsushi Kanno, Tetsuya Kawanishi, Masayuki Izutsu, Hirochika Nakajima
2014 INTERNATIONAL TOPICAL MEETING ON MICROWAVE PHOTONICS (MWP) AND THE 2014 9TH ASIA-PACIFIC MICROWAVE PHOTONICS CONFERENCE (APMP) 160 - 163 2014年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
We demonstrated frequency-quadruple optical two-tone signal generation using integrated modulator driven by one-port RF signal input without optical filters. As a result, we generated the two-tone signal and the spurious suppression ratio was 27 dB.
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Extinction-Ratio and Chirp Tunable LiNbO3 Single-Drive Modulator for Precise Amplitude Modulation 査読あり
Yuya Yamaguchi, Shinya Nakajima, Atsushi Kanno, Tetsuya Kawanishi, Masayuki Izutsu, Hirochika Nakajima
2014 EUROPEAN CONFERENCE ON OPTICAL COMMUNICATION (ECOC) 2014年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
We propose an extinction-ratio and chirp tunable modulator in single-drive operation. Using the modulator, we demonstrated precise amplitude modulation without parasitic phase modulation. Extinction-ratio was larger than 52.2 dB, with low chirp (<vertical bar 0.007 vertical bar) operation.
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Evaluation of Frequency Fluctuation in Fiber-Wireless Link with Direct IQ Down-Converter 査読あり
Atsushi Kanno, Pham Tien Dat, Toshiaki Kuri, Iwao Hosako, Tetsuya Kawanishi, Yuki Yoshida, Ken'ichi Kitayama
2014 EUROPEAN CONFERENCE ON OPTICAL COMMUNICATION (ECOC) 2014年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
We demonstrate 12-Gbaud QPSK signal transmission in a fiber-wireless link and compare a modulator-based optical two-tone generator and an optical heterodyning with free-running lasers. The obtained frequency fluctuation of the two-tone system meets the requirements of the radio regulations.
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Electro-Optic Devices for Imaging Systems Using Radio-over-Fibre 査読あり
Tetsuya Kawanishi, Naokatsu Yamamoto, Toshimasa Umezawa, Kouichi Akahane, Atsushi Kanno, Pham Tien Dat
2014 16TH INTERNATIONAL CONFERENCE ON TRANSPARENT OPTICAL NETWORKS (ICTON) 2014年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
This paper describes high-speed optical modulation and detection devices for radio-over-fibre ( RoF) systems which can distribute millimetre-wave signals over optical fibres with low-loss, and RoF-based high-performance imaging systems which can be used for foreign object debris in runways or railways. High-speed and high-sensitivity photo-detection would be very important to achieve high-resolution imaging. We will share our recent research results on precise lightwave modulation techniques and on high-speed photodetectors using quantum dots.
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Direct Chirp Measurement of Electro Absorption Modulator Using Optical Homodyne Quadrature Demodulation Technique 査読あり
Ukrit Mankong, Tanawat Tangmala, Keizo Inagaki, Atsushi Kanno, Tetsuya Kawanishi
2014 EUROPEAN CONFERENCE ON OPTICAL COMMUNICATION (ECOC) 2014年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
We propose a novel method to measure chirp of an electro-absorption modulator at any frequency using optical homodyne quadrature demodulation technique. Chirp parameters are directly obtained in the small-signal vector space, enabling practical chirp assessment for advanced modulation optical transmission.
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DIGITAL SIGNAL PROCESSING TECHNIQUES FOR MULTI-CORE FIBER TRANSMISSION USING SELF-HOMODYNE DETECTION SCHEMES 招待あり 査読あり
Jose Manuel Delgado Mendinueta, Ruben S. Luis, Benjamin J. Puttnam, Jun Sakaguchi, Werner Klaus, Yoshinari Awaji, Naoya Wada, Atsushi Kanno, Tetsuya Kawanishi
2014 PROCEEDINGS OF THE 22ND EUROPEAN SIGNAL PROCESSING CONFERENCE (EUSIPCO) 1880 - 1884 2014年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
We discuss digital signal processing (DSP) techniques for self-homodyne detection (SHD), multi-core fiber (MCF) transmission links, and related technologies. We focus on exploiting the reduced phase noise of self-homodyne multi-core fiber (SH-MCF) systems to enable DSP resource savings and describe digital receiver architectures that mixes signal and local oscillator in the digital domain.
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Digital and analog signal transmission technologies based on multi-level modulation and precise lightwave control 査読あり
Tetsuya Kawanishi, Atsushi Kanno
2014 IEEE PHOTONICS CONFERENCE (IPC) 270 - 271 2014年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
This presentation shows precise lightwave control and multi-level modulation techniques for analog and digital signal transmission. Digital signal processing can mitigate signal degradation in seamless access communication systems of wired and wireless links
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Development of a 30-GHz high conversion gain analog photoreceiver 査読あり
T. Umezawa, K. Akahane, N. Yamamoto, P. T. Dat, A. Kanno, T. Kawanishi
2014 OPTOELECTRONICS AND COMMUNICATIONS CONFERENCE AND AUSTRALIAN CONFERENCE ON OPTICAL FIBRE TECHNOLOGY (OECC/ACOFT 2014) 245 - 246 2014年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
We have developed a 30-GHz high conversion gain analog photoreceiver. In the demonstration, a minimum optical input power of as low as -14 dBm at a BER of 10(-3) was achieved for a 1-m long-distance wireless communication.
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De-multiplexer of Wavelength Division Multiplexed Radio-over-Fiber Signal for Application of W-Band Frequency-Modulated ContinuousWave Radar Systems 査読あり
Toshiaki Kuri, Atsushi Kanno, Tetsuya Kawanishi
2014 OPTOELECTRONICS AND COMMUNICATIONS CONFERENCE AND AUSTRALIAN CONFERENCE ON OPTICAL FIBRE TECHNOLOGY (OECC/ACOFT 2014) 126 - 128 2014年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
The characteristics of a newly-developed de-multiplexer for wavelength-division-multiplexed (WDM) radio-overfiber (RoF) signal, which is applicable for frequencymodulated continuous-wave (FM-CW) radar systems, is investigated and the de-multiplexing of 4-channel WDM 32-GHz-band FM-CW RoF signal is demonstrated.
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Coherently-Pumped 20Gbaud 16QAM Optical Wavelength Shifting Free of Phase Noise from Pumps 査読あり
Guo-Wei Lu, Andre Albuquerque, Benjamin J. Puttnam, Takahide Sakamoto, Miguel Drummond, Rogerio Nogueira, Atsushi Kanno, Satoshi Shinada, Naoya Wada, Tetsuya Kawanishi
2014 OPTOELECTRONICS AND COMMUNICATIONS CONFERENCE AND AUSTRALIAN CONFERENCE ON OPTICAL FIBRE TECHNOLOGY (OECC/ACOFT 2014) 589 - + 2014年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
We experimentally demonstrate an optical wavelength shifting scheme of 20Gbaud 16QAM based on cascaded 2nd-order nonlinearities in PPLN using coherent pumps, which is free of the phase noise from pumps.
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22.5-GHz-band radio-over-fiber signal transmission over fiber-wireless hybrid link using optical phase-locked loop source 査読あり
Meisaku Suzuki, Atsushi Kanno, Tetsuya Kawanishi, Hideyuki Sotobayashi
2014 INTERNATIONAL TOPICAL MEETING ON MICROWAVE PHOTONICS (MWP) AND THE 2014 9TH ASIA-PACIFIC MICROWAVE PHOTONICS CONFERENCE (APMP) 315 - 317 2014年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
3.0-Gb/s signal transmission over a fiber-wireless hybrid link at the 22.5-GHz-band is demonstrated. A frequency-stabilized radio-over-fiber signal is generated using an optical phase-locked-loop driven by a synthesizer using a direct photonic up-conversion technique.
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20-Gbaud QPSK Coherent Radio Transmission at 325 GHz with High-Gain Antennas 査読あり
Atsushi Kanno, Toshiaki Kuri, Isao Morohashi, Iwao Hosako, Tetsuya Kawanishi, Yuki Yoshida, Ken'ichi Kitayama
2014 39TH INTERNATIONAL CONFERENCE ON INFRARED, MILLIMETER, AND TERAHERTZ WAVES (IRMMW-THZ) 2014年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
High-speed coherent transmission at 325 GHz is successfully demonstrated with a 20-Gbaud QPSK signal. A frequency-locked terahertz signal can be provided by an optical-modulation-based optical frequency comb signal. A high-gain antenna with a gain of 46 dBi is suitable to extend the transmission distance up to 15 m without requiring a terahertz amplifier.
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1.3-mu m waveband 10-Gbaud quadrature-phase-shift-keying signal transmission over 4-km holey fiber using quantum dot laser 査読あり
Yasuaki Kurata, Akihiro Murano, Kazunari Tomishige, Atsushi Kanno, Naokatsu Yamamoto, Tetsuya Kawanishi, Hideyuki Sotobayashi
2014 OPTOELECTRONICS AND COMMUNICATIONS CONFERENCE AND AUSTRALIAN CONFERENCE ON OPTICAL FIBRE TECHNOLOGY (OECC/ACOFT 2014) 639 - + 2014年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
A 1.3-mu m waveband 10-Gbaud photonic transport system transmitting quadrature-phase-shift-keying (QPSK) signals over a 4-km single-mode holey fiber was demonstrated using a newly developed wavelength-tunable quantum dot (QD) laser fabricated through the sandwiched sub-nano separator technique.
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Radio-on-Terahertz Over Fiber System for Future Mobile Fronthauling 査読あり
Atsushi Kanno, Pham Tien Dat, Iwao Hosako, Tetsuya Kawanishi, Hiroyo Ogawa
2014 IEEE GLOBAL COMMUNICATIONS CONFERENCE (GLOBECOM 2014) 2218 - 2222 2014年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
The technology of encapsulating a microwave signal into a terahertz carrier and an optical signal is proposed and demonstrated experimentally. Broad bandwidth terahertz radio can encapsulate existing microwave services, including advanced mobile communication signals, by using photonics technology. The concept of radio-on-terahertz-over-fiber helps to realize the future design of mobile fronthaul links. These links will have seamless connectivity between radio and optical networks because of the low latency of the links, which results from the use of analog signal transmission technology.
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Recent standardization activities on Radio on Fiber (RoF) 査読あり
Hiroyo Ogawa, Toshiaki Kuri, Atsushi Kanno, Tetsuya Kawanishi
BROADBAND ACCESS COMMUNICATION TECHNOLOGIES VIII 9007 2014年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：SPIE-INT SOC OPTICAL ENGINEERING
The Radio on Fiber (RoF) technologies are unique transmission means of radio analog signals through optical fiber cables. These technologies are currently discussed at international standard organizations such as ITU-T, IEC, APT and IEEE802. This invited paper summarizes RoF standardization activities at those standard organizations.
DOI： 10.1117/12.2039411
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Recent standardization activities on Radio over Fiber Technologies 査読あり
Hiroyo Ogawa, Toshiaki Kuri, Atsushi Kanno, Tetsuya Kawanishi
2014 IEEE 5TH INTERNATIONAL CONFERENCE ON PHOTONICS (ICP) 20 - 22 2014年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
The Radio over Fiber (RoF) technologies are unique transmission means of radio analog signals through optical fiber cables for radiocommunicatoion services. These technologies are currently discussed at international standard organizations such as ITU-T, IEC, APT and IEEE802. This invited paper summarizes recent standardization activities on RoF technologies at those standard organizations.
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Seamless W-Band Radio-to-Optical Signal Conversion with Direct IQ Down-Converter 査読あり
Atsushi Kanno, Pham Tien Dat, Toshiaki Kuri, Iwao Hosako, Tetsuya Kawanishi, Yuki Yoshida, Ken-ichi Kitayama
2014 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXHIBITION (OFC) 2014年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
Seamless conversion from millimeter-wave radio signals to optical baseband signals was demonstrated using a direct IQ down-converter. Hybrid optical and millimeter-wave signal transmission was performed using a conventional digital-coherent receiver, without any special algorithms. (C) 2013 Optical Society of America
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Suppression of Third-order Harmonics in Two-tone Signals Using Cascaded Mach-Zehnder Modulators 査読あり
Kazuki Seki, Yuya Yamaguchi, Atsushi Kanno, Tetsuya Kawanishi, Masayuki Izutsu, Hirochika Nakajima
2014 INTERNATIONAL TOPICAL MEETING ON MICROWAVE PHOTONICS (MWP) AND THE 2014 9TH ASIA-PACIFIC MICROWAVE PHOTONICS CONFERENCE (APMP) 157 - 159 2014年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
We investigate a technique to suppress undesired third-order harmonics of two-tone lightwave signals using cascaded Mach-Zehnder modulators. Third-order harmonics, which determines the signal-to-noise ratio and side-mode suppression ratio, are dominant spurious components in two-tone lightwave signals. We were able to improve the linearity of modulator and demonstrated 14 dB suppression of third-order harmonics at 10 GHz with the technique.
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Ultra-Broadband UTC-PD beyond 110 GHz at 0 V for Future Photonic Integration 査読あり
T. Umezawa, K. Akahane, N. Yamamoto, K. Inagaki, A. Kanno, T. Kawanishi
2014 INTERNATIONAL TOPICAL MEETING ON MICROWAVE PHOTONICS (MWP) AND THE 2014 9TH ASIA-PACIFIC MICROWAVE PHOTONICS CONFERENCE (APMP) 450 - 453 2014年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
We have successfully realized the non-bias operation of an ultra-wide bandwidth uni-traveling-carrier photodetector (UTC-PD) using a low carrier concentration of 3 x 1014 cm(-3) in the carrier collection layer for future high-density photonic integration. A 3-dB bandwidth above 110 GHz was confirmed without a bias circuit. In this paper, we discuss the proposed design and the experimental results obtained for the frequency response and maximum RF output power.
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Uplink Burst LTE-A Signal Transmission on a Converged Millimeter-Wave and RoF System 査読あり
Pham Tien Dat, Atsushi Kanno, Tetsuya Kawanishi
2014 INTERNATIONAL TOPICAL MEETING ON MICROWAVE PHOTONICS (MWP) AND THE 2014 9TH ASIA-PACIFIC MICROWAVE PHOTONICS CONFERENCE (APMP) 13 - 16 2014年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
We propose a high-speed uplink burst-mode LTE-A signal transmission on a converged millimeter-wave and radio-over-fiber system. By using a newly developed burst-mode optical amplifier, we successfully transmit an uplink 5-carrier component LTE-A signal over a converged 5-m 92.5-GHz wireless link and 20-km radio-over-fiber system.
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Wavelength Characteristics of Mach-Zehnder Modulator Using Active Y-branch 査読あり
Hiroyuki Koyano, Yuya Yamaguchi, Atsushi Kanno, Tetsuya Kawanishi, Masayuki Izutsu, Hirochika Nakajima
2014 INTERNATIONAL TOPICAL MEETING ON MICROWAVE PHOTONICS (MWP) AND THE 2014 9TH ASIA-PACIFIC MICROWAVE PHOTONICS CONFERENCE (APMP) 124 - 126 2014年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
Wavelength characteristics of the extinction ratio of optical Mach-Zehnder modulator using an active Y-branch is evaluated over C-band wavelengths. The observed extinction ratios are achieved greater than 60 dB at all of the wavelengths by optimization of applying voltage to the Y-branch by each wavelength.
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Wired and wireless seamless access network system 査読あり
Tetsuya Kawanishi, Keizo Inagaki, Atsushi Kanno
2014 IEEE 7TH INTERNATIONAL CONFERENCE ON ADVANCED INFOCOMM TECHNOLOGY (ICAIT) 267 - 269 2014年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
This paper describes a concept of wired and wireless seamless links which can transfer waveforms over various transmission media including optical fibers, millimeter-waves, etc. The seamless links would enhance resilience and reduce latency.
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High-Gain Radio-over-Fiber Uplink for Mobile Fronthaul 査読あり
Atsushi Kanno, Toshiaki Kuri, Tetsuya Kawanishi, Hiroyo Ogawa, Yoshihiro Imajo
2014 INTERNATIONAL TOPICAL MEETING ON MICROWAVE PHOTONICS (MWP) AND THE 2014 9TH ASIA-PACIFIC MICROWAVE PHOTONICS CONFERENCE (APMP) 291 - 294 2014年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
We report high-gain optical-to-electrical and electrical-to-optical converters for application to an analog radio-over-fiber link for an uplink signal transport on a mobile fronthaul. A 50-dB gain link with a relatively low noise figure provides an RF sensitivity of less than 90 dBm.
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Wired and wireless seamless access network system 査読あり
Tetsuya Kawanishi, Keizo Inagaki, Atsushi Kanno
2014 IEEE 7TH INTERNATIONAL CONFERENCE ON ADVANCED INFOCOMM TECHNOLOGY (ICAIT) 267 - 269 2014年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
This paper describes a concept of wired and wireless seamless links which can transfer waveforms over various transmission media including optical fibers, millimeter-waves, etc. The seamless links would enhance resilience and reduce latency.
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Wavelength Characteristics of Mach-Zehnder Modulator Using Active Y-branch 査読あり
Hiroyuki Koyano, Yuya Yamaguchi, Atsushi Kanno, Tetsuya Kawanishi, Masayuki Izutsu, Hirochika Nakajima
2014 INTERNATIONAL TOPICAL MEETING ON MICROWAVE PHOTONICS (MWP) AND THE 2014 9TH ASIA-PACIFIC MICROWAVE PHOTONICS CONFERENCE (APMP) 124 - 126 2014年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
Wavelength characteristics of the extinction ratio of optical Mach-Zehnder modulator using an active Y-branch is evaluated over C-band wavelengths. The observed extinction ratios are achieved greater than 60 dB at all of the wavelengths by optimization of applying voltage to the Y-branch by each wavelength.
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Uplink Burst LTE-A Signal Transmission on a Converged Millimeter-Wave and RoF System 査読あり
Pham Tien Dat, Atsushi Kanno, Tetsuya Kawanishi
2014 INTERNATIONAL TOPICAL MEETING ON MICROWAVE PHOTONICS (MWP) AND THE 2014 9TH ASIA-PACIFIC MICROWAVE PHOTONICS CONFERENCE (APMP) 13 - 16 2014年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
We propose a high-speed uplink burst-mode LTE-A signal transmission on a converged millimeter-wave and radio-over-fiber system. By using a newly developed burst-mode optical amplifier, we successfully transmit an uplink 5-carrier component LTE-A signal over a converged 5-m 92.5-GHz wireless link and 20-km radio-over-fiber system.
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Ultra-Broadband UTC-PD beyond 110 GHz at 0 V for Future Photonic Integration 査読あり
T. Umezawa, K. Akahane, N. Yamamoto, K. Inagaki, A. Kanno, T. Kawanishi
2014 INTERNATIONAL TOPICAL MEETING ON MICROWAVE PHOTONICS (MWP) AND THE 2014 9TH ASIA-PACIFIC MICROWAVE PHOTONICS CONFERENCE (APMP) 450 - 453 2014年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
We have successfully realized the non-bias operation of an ultra-wide bandwidth uni-traveling-carrier photodetector (UTC-PD) using a low carrier concentration of 3 x 1014 cm(-3) in the carrier collection layer for future high-density photonic integration. A 3-dB bandwidth above 110 GHz was confirmed without a bias circuit. In this paper, we discuss the proposed design and the experimental results obtained for the frequency response and maximum RF output power.
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Suppression of Third-order Harmonics in Two-tone Signals Using Cascaded Mach-Zehnder Modulators 査読あり
Kazuki Seki, Yuya Yamaguchi, Atsushi Kanno, Tetsuya Kawanishi, Masayuki Izutsu, Hirochika Nakajima
2014 INTERNATIONAL TOPICAL MEETING ON MICROWAVE PHOTONICS (MWP) AND THE 2014 9TH ASIA-PACIFIC MICROWAVE PHOTONICS CONFERENCE (APMP) 157 - 159 2014年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
We investigate a technique to suppress undesired third-order harmonics of two-tone lightwave signals using cascaded Mach-Zehnder modulators. Third-order harmonics, which determines the signal-to-noise ratio and side-mode suppression ratio, are dominant spurious components in two-tone lightwave signals. We were able to improve the linearity of modulator and demonstrated 14 dB suppression of third-order harmonics at 10 GHz with the technique.
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Seamless W-Band Radio-to-Optical Signal Conversion with Direct IQ Down-Converter 査読あり
Atsushi Kanno, Pham Tien Dat, Toshiaki Kuri, Iwao Hosako, Tetsuya Kawanishi, Yuki Yoshida, Ken-ichi Kitayama
2014 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXHIBITION (OFC) 2014年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
Seamless conversion from millimeter-wave radio signals to optical baseband signals was demonstrated using a direct IQ down-converter. Hybrid optical and millimeter-wave signal transmission was performed using a conventional digital-coherent receiver, without any special algorithms. (C) 2013 Optical Society of America
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Recent standardization activities on Radio over Fiber Technologies 査読あり
Hiroyo Ogawa, Toshiaki Kuri, Atsushi Kanno, Tetsuya Kawanishi
2014 IEEE 5TH INTERNATIONAL CONFERENCE ON PHOTONICS (ICP) 20 - 22 2014年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
The Radio over Fiber (RoF) technologies are unique transmission means of radio analog signals through optical fiber cables for radiocommunicatoion services. These technologies are currently discussed at international standard organizations such as ITU-T, IEC, APT and IEEE802. This invited paper summarizes recent standardization activities on RoF technologies at those standard organizations.
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Recent standardization activities on Radio on Fiber (RoF) 査読あり
Hiroyo Ogawa, Toshiaki Kuri, Atsushi Kanno, Tetsuya Kawanishi
BROADBAND ACCESS COMMUNICATION TECHNOLOGIES VIII 9007 2014年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：SPIE-INT SOC OPTICAL ENGINEERING
The Radio on Fiber (RoF) technologies are unique transmission means of radio analog signals through optical fiber cables. These technologies are currently discussed at international standard organizations such as ITU-T, IEC, APT and IEEE802. This invited paper summarizes RoF standardization activities at those standard organizations.
DOI： 10.1117/12.2039411
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Radio-on-Terahertz Over Fiber System for Future Mobile Fronthauling 査読あり
Atsushi Kanno, Pham Tien Dat, Iwao Hosako, Tetsuya Kawanishi, Hiroyo Ogawa
2014 IEEE GLOBAL COMMUNICATIONS CONFERENCE (GLOBECOM 2014) 2218 - 2222 2014年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
The technology of encapsulating a microwave signal into a terahertz carrier and an optical signal is proposed and demonstrated experimentally. Broad bandwidth terahertz radio can encapsulate existing microwave services, including advanced mobile communication signals, by using photonics technology. The concept of radio-on-terahertz-over-fiber helps to realize the future design of mobile fronthaul links. These links will have seamless connectivity between radio and optical networks because of the low latency of the links, which results from the use of analog signal transmission technology.
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Quantum dot two-mode laser at 1.55 mu m-band for 90GHz radio over fiber applications 査読あり
Kouichi Akahane, Naokatsu Yamamoto, Atsushi Kanno, Toshimasa Umezawa, Tetsuya Kawanishi
2014 EUROPEAN CONFERENCE ON OPTICAL COMMUNICATION (ECOC) 2014年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
The two-mode lasing is obtained at the telecom-band using an InAs quantum dot gain chip. The wavelengths of the two modes were 1539.73 and 1540.44 nm corresponded to the frequency separation of 89.8 GHz which generated millimeter wave signal.
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Pump-Linewidth-Tolerant Wavelength Conversion with Coherent Pumps 査読あり
Guo-Wei Luo, Andre Albuquerque, Benjamin J. Puttnam, Takahide Sakamoto, Miguel Drummond, Rogerio Nogueira, Atsushi Kanno, Satoshi Shinada, Naoya Wada, Tetsuya Kawanishi
2014 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO) 2014年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
We propose a pump-linewidth-tolerant wavelength conversion scheme with coherent two-tone pump, and demonstrate high quality wavelength conversion of 64QAM signals with <0.3-dB penalty at BER of 10(-3) even using 3.5MHz-linewidth DFB pump source.
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Pump-Linewidth-Tolerant Optical Data Exchange between 16QAM and QPSK with 50-GHz Channel-Spacing using Coherent DFB Pump 査読あり
Guo-Wei Lu, Andre Albuquerque, Benjamin J. Puttnam, Takahide Sakamoto, Miguel Drummond, Rogerio Nogueira, Atsushi Kanno, Satoshi Shinada, Naoya Wada, Tetsuya Kawanishi
2014 EUROPEAN CONFERENCE ON OPTICAL COMMUNICATION (ECOC) 2014年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
We propose and experimentally demonstrate optical data exchange scheme between 16QAM and QPSK with narrow spacing of 50GHz. The use of coherent pump makes it free of phase noise from pumps, and enables the use of low-cost DFB as pump source.
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PERFORMANCE OF HIGH THROUGHPUT WLAN SIGNAL ON A SEAMLESS RADIO-OVER-FIBER AND 90-GHZ WIRELESS CONVERGENCE SYSTEM 査読あり
Pham Tien Dat, Atsushi Kanno, Tetsuya Kawanishi
2014 OPTOELECTRONICS AND COMMUNICATIONS CONFERENCE AND AUSTRALIAN CONFERENCE ON OPTICAL FIBRE TECHNOLOGY (OECC/ACOFT 2014) 1030 - 1032 2014年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
A simple and reliable system based on analog radio-over-fiber and millimeter-wave-wireless is proposed for wireless signal transmission. High-throughput WLAN signals using high-order modulation and wide bandwidth is successfully transmitted and demodulated over the proposed system.
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Performance of Burst-Mode LTE-A Signal on A Converged RoF and W-band Wireless System 査読あり
Pham Tien Dat, Atsushi Kanno, Tetsuya Kawanishi
2014 44TH EUROPEAN MICROWAVE CONFERENCE (EUMC) 909 - 912 2014年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
We propose and experimentally investigate a high-speed burst-mode LTE-A signal transmission on a seamlessly converged RoF and millimeter-wave system at 90 GHz. Satisfactory transmission performance over the converged RoF and a 1.2-m 90-GHz wireless link is achieved. The obtained results confirm the potential to use the system in future high-speed mobile and broadband access networks.
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Performance of a 90-GHz Radio-on-Radio-over-Fiber System Suitable for Communications in High-Speed Railways 査読あり
Pham Tien Dat, Atsushi Kanno, Tetsuya Kawanishi
2014 IEEE MTT-S INTERNATIONAL MICROWAVE SYMPOSIUM (IMS) 2014年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
We propose a radio access network suitable for communications in high-speed railways employing a radio-on-radio- over-fiber and distributed antenna system. We present a proof-of-concept demonstration of wireless signal transmission over the system at 90 GHz. Standard LTE-A signals using QPSK, 16-QAM and 64-QAM modulation are successfully transmitted and demodulated. Satisfactory transmission performance with measured root-mean-square EVM well under the standard requirement is achieved. The obtained results indicate the potential to make use of the system in high-speed rail communications.
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Performance Evaluation of Wavelength Division Multiplexed Radio-over-Fiber De-multiplexer in Frequency-Modulated Continuous-Wave Signal Delivery Systems 査読あり
Toshiaki Kuri, Atsushi Kanno, Tetsuya Kawanishi
2014 INTERNATIONAL TOPICAL MEETING ON MICROWAVE PHOTONICS (MWP) AND THE 2014 9TH ASIA-PACIFIC MICROWAVE PHOTONICS CONFERENCE (APMP) 218 - 221 2014年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
A wavelength-division-multiplexed (WDM) radio-over-fiber (RoF) de-multiplexer, which is specially designed for frequency-modulated continuous-wave (FM-CW) signal delivery systems, is newly developed. The characteristics of the developed de-multiplexer are described and then the de-multiplexing performances of 4-channel WDM 32-GHz-band and 8-channel WDM 48-GHz-band FM-CW RoF signals are evaluated with the de-multiplexer.
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Optical DFG-based 60 GHz signal generation by using a LiTaO3 rectangular waveguide 査読あり
Yusuke Takashima, Yuto Maejima, Hiroshi Murata, Yasuyuki Okamura, Atsushi Kanno, Tetsuya Kawanishi
IEICE ELECTRONICS EXPRESS 11 ( 12 ) 2014年
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG
Millimeter-wave (MMW) signal generation devices using difference frequency generation (DFG) based on the second order nonlinear optical effect in a rectangular waveguide were studied in detail theoretically and experimentally. The temporal and spatial coupling process of a generated MMW signal to a TE10 mode in a rectangular waveguide embedded with a nonlinear crystal was analyzed using the finite-difference time-domain (FDTD) method. In the experiment, 60 GHz-band signals were successfully obtained from fabricated prototype devices using a rectangular waveguide embedded with z-cut LiTaO3 crystal.
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Multilevel Signal Transmission at 600 GHz 査読あり
Atsushi Kanno, Pham Tien Dat, Isao Morohashi, Iwao Hosako, Tetsuya Kawanishi
2014 INTERNATIONAL TOPICAL MEETING ON MICROWAVE PHOTONICS (MWP) AND THE 2014 9TH ASIA-PACIFIC MICROWAVE PHOTONICS CONFERENCE (APMP) 362 - 365 2014年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
Terahertz-wave signal transmission is demonstrated using quadrature amplitude modulation (QAM) by photonics. Small frequency fluctuations using a frequency-locked optical frequency comb are capable of generating a 80-MHz-bandwidth 16-ary-QAM signal with a data rate of 195 Mb/s.
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Millimeter-wave Signal Generation Using Cascaded Optical Frequency Multiplication Technique 査読あり
Atsushi Kanno, Tetsuya Kawanishi
2014 44TH EUROPEAN MICROWAVE CONFERENCE (EUMC) 1028 - 1031 2014年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
We propose a frequency-octupling technique for millimeter-wave and terahertz signal generation using cascaded optical frequency multipliers based on optical modulation. A millimeter-wave-capable optical frequency doubler connected to an optical frequency quadrupler provides a 100-200-GHz signal whose number of multiplications is eight. The observed phase-noise degradation is followed by theoretically expected degradation.
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Millimeter-Wave Signal Generation Device Using Optical Difference Frequency Generation in LiTaO3 Crystal Suspended to Rectangular Waveguide 査読あり
Yusuke Takashima, Yuto Maejima, Hiroshi Murata, Yasuyuki Okamura, Atsushi Kanno, Tetsuya Kawanishi
2014 INTERNATIONAL TOPICAL MEETING ON MICROWAVE PHOTONICS (MWP) AND THE 2014 9TH ASIA-PACIFIC MICROWAVE PHOTONICS CONFERENCE (APMP) 153 - 156 2014年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
A new millimeter-wave (MMW) signal generation device using a rectangular waveguide and second order nonlinear optical effect is proposed. Using a T-shaped rectangular waveguide with a suspended LiTaO3 crystal, adiabatic MMW signal injection into the waveguide is obtainable through optical difference frequency generation in the crystal. This device is easy for coupling to standard rectangular waveguide circuits compared with the proto-type devices where a nonlinear crystal is completely embedded into a rectangular waveguide. Analysis, design and preliminary experimental results are reported.
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Low Frequency Analog Signal Distribution on Digital Photonic Networks by Optical Delta Sigma Modulation 査読あり
Atsushi Kanno, Tetsuya Kawanishi
BROADBAND ACCESS COMMUNICATION TECHNOLOGIES VIII 9007 2014年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：SPIE-INT SOC OPTICAL ENGINEERING
We propose a delta-sigma modulation scheme for low- and medium-frequency signal transmission in a digital photonic network system. A 10-Gb/s-class optical transceiver with a delta-sigma modulator utilized as a high-speed analog-to-digital converter (ADC) provides a binary optical signal. On the signal reception side, a low-cost and slow-speed photonic receiver directly converts the binary signal into an analog signal at frequencies from several hundreds of kilohertz several tens of megahertz. Further, by using a clock and data recovery circuit at the receiver to reduce jitters, the single-sideband phase noise of the generated signals can be significantly reduced.
DOI： 10.1117/12.2038114
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Improvement of photodiode responsivity using the InAs quantum dot family for monolithic integration 査読あり
T. Umezawa, K. Akahane, A. Kanno, T. Kawanishi
2014 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO) 2014年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
We report a photodiode (PD) hybrid sub-system using a 1.5. m quantum dot (QD) semiconductor optical amplifier (SOA) and a QD-PD for a high-speed and high-sensitivity photoreceiver, and we characterize its responsivity.
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High-Speed Photonic Device Technologies in Optical Fiber Connected Millimeter-wave Radar System for Foreign Object Debris Detection on Runways 査読あり
Naokatsu Yamamoto, Toshimasa Umezawa, Atsushi Kanno, Kouichi Akahane, Tetsuya Kawanishi
2014 XXXITH URSI GENERAL ASSEMBLY AND SCIENTIFIC SYMPOSIUM (URSI GASS) 2014年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
Precise imaging of obstacles and foreign-object debris (FOD) is one of the most important security technologies for avoiding trouble in advance. Recently, we have focused on an optical fiber connected millimeter-wave radar system using a radio over fiver (RoF) technique for effectively detecting FOD over the large area of an airport runway. In this paper, we introduce high-speed photonic devices such as a W-band frequency modulated continuous-wave (FM-CW) signal generator, a highly-sensitive quantum dot (QD) photodetector, and a QD optical frequency comb laser (QD-CML) with harmonically optical pulsation. It is expected that these advanced photonic device technologies will become potential candidates for use in the RoF technique to realize the optical fiber connected millimeter-wave radar system.
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High-Performance Analog Photoreceiver for Millimeter-Wave Radio-over-Fiber Applications 査読あり
T. Umezawa, K. Akahane, N. Yamamoto, A. Kanno, K. Jitsuno, N. Shibagaki, T. Kawanishi
2014 INTERNATIONAL TOPICAL MEETING ON MICROWAVE PHOTONICS (MWP) AND THE 2014 9TH ASIA-PACIFIC MICROWAVE PHOTONICS CONFERENCE (APMP) 109 - 112 2014年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
We have developed a high-conversion-gain analog photoreceiver for millimeter-wave radio-over-fiber applications. The performance was tested with an optical back-to-back configuration at a symbol rate of 1.76-2.2 Gbaud in pi/2-shift BPSK and 16-QAM at a single carrier frequency of 32 GHz.
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(IPC) multigigabit relay link using millimeter-Wave radio-over-Fiber technologies 査読あり
A. Kanno, T. Kawanishi, H. Ogawa, N. Shibagaki, H. Hanyu
IEEE Photonics Journal 5 ( 6 ) 2013年12月
記述言語：英語 掲載種別：研究論文（学術雑誌）
A multigigabit relay transceiver system based on analog radio-over-fiber technology is proposed and experimentally evaluated for broadband radio-signal transmission in the millimeter-wave band, particularly at 60 GHz. The combination of a high-speed optical modulator and a photodiode provides signal delivery over an optical fiber. The observed dynamic range and resultant error vector magnitude of a 16-ary quadrature amplitude modulation signal compliant with the IEEE 802.11ad Standard, designated for a wireless local access network at 60 GHz, can be within the limit set by the standard. © 2013 IEEE.
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Stable Two-Mode Emission from Semiconductor Quantum Dot Laser 査読あり
Kouichi Akahane, Naokatsu Yamamoto, Atsushi Kanno, Keizo Inagaki, Toshimasa Umezawa, Tetsuya Kawanishi, Takashi Endo, Yasunori Tomomatsu, Toshio Yamanoi
APPLIED PHYSICS EXPRESS 6 ( 10 ) 2013年10月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：IOP PUBLISHING LTD
A two-wavelength emission laser (two-mode laser) has been fabricated using semiconductor quantum dots as the gain medium in the external cavity configuration. Two-mode laser emission with a separation of 98.8 GHz has been achieved by controlling the etalon and narrow-band filter setting. A 98.4 GHz beat signal was observed using the Michelson interferometer configuration, indicating that these emissions occurred simultaneously. (C) 2013 The Japan Society of Applied Physics
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Stable Two-Mode Emission from Semiconductor Quantum Dot Laser 査読あり
Kouichi Akahane, Naokatsu Yamamoto, Atsushi Kanno, Keizo Inagaki, Toshimasa Umezawa, Tetsuya Kawanishi, Takashi Endo, Yasunori Tomomatsu, Toshio Yamanoi
APPLIED PHYSICS EXPRESS 6 ( 10 ) 2013年10月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：IOP PUBLISHING LTD
A two-wavelength emission laser (two-mode laser) has been fabricated using semiconductor quantum dots as the gain medium in the external cavity configuration. Two-mode laser emission with a separation of 98.8 GHz has been achieved by controlling the etalon and narrow-band filter setting. A 98.4 GHz beat signal was observed using the Michelson interferometer configuration, indicating that these emissions occurred simultaneously. (C) 2013 The Japan Society of Applied Physics
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In-Service Method of Path Length Alignment in SDM Systems with Self-Homodyne Detection 査読あり
Ruben S. Luís, Benjamin J. Puttnam, José-Manuel Delgado Mendinueta, Jun Sakaguchi, Werner Klaus, Yoshinari Awaji, Naoya Wada, Atsushi Kanno, Tetsuya Kawanishi
18th OptoElectronics and Communications Conference (OECC) ThR3_3 2013年07月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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Energy Efficient Carrier Phase Recovery for Self-Homodyne Polarization- Multiplexed QPSK 査読あり
José-Manuel Delgado Mendinueta, Benjamin J, Puttnam, Jun Sakaguchi, Ruben S. Luís, Werner Klaus, Yoshinari Awaji, Naoya Wada, Atsushi Kanno, Tetsuya Kawanishi
18th OptoElectronics and Communications Conference (OECC) ThR3-5 2013年07月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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Transmission Penalties in a 19-Core Fiber System with Self-Homodyne Detection 査読あり
Benjamin J. Puttnam, José-Manuel Delgado Mendinueta, Jun Sakaguchi, Ruben S. Luís, Werner Klaus, Yoshinari Awaji, Naoya Wada, Atsushi Kanno, Tetsuya Kawanishi
18th OptoElectronics and Communications Conference (OECC) MR2-5 2013年07月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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105Tb/s Transmission System Using Low-cost, MHz Linewidth DFB Lasers Enabled by Self-Homodyne Coherent Detection and a 19-Core Fiber 査読あり
Benjamin J. Puttnam, José-Manuel Delgado Mendinueta, Jun Sakaguchi, Ruben S. Luís, Werner Klaus, Yoshinari Awaji, Naoya Wada, Atsushi Kanno, Tetsuya Kawanishi
2013 Optical Fiber Communication Conference and Exposition and the National Fiber Optic Engineers Conference (OFC/NFOEC) OW1I.1 2013年03月
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305 Tb/s Space Division Multiplexed Transmission Using Homogeneous 19-Core Fiber 招待あり 査読あり
Jun Sakaguchi, Benjamin J. Puttnam, Werner Klaus, Yoshinari Awaji, Naoya Wada, Atsushi Kanno, Tetsuya Kawanishi, Katsunori Imamura, Harumi Inaba, Kazunori Mukasa, Ryuichi Sugizaki, Tetsuya Kobayashi, Masayuki Watanabe
JOURNAL OF LIGHTWAVE TECHNOLOGY 31 ( 4 ) 554 - 562 2013年02月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
We report record capacity data transmission at 305 Tb/s over 10.1 km, using space division multiplexing (SDM) with 19 channels. To realize such a large SDM channel number, we fabricated a trench-assisted homogeneous 19-core fiber with average intercore crosstalk of about dB at 1550 nm. We also fabricated a 19-channel SDM multiplexer/demultiplexer using free-space optics with low insertion losses and low additional crosstalk. The data signal transmitted through each SDM channel was 100 wavelength division multiplexing (100 GHz spacing) 2 86 Gb/s polarization-division-multiplexed quadrature phase shift keying signals and the spectral efficiency was 30.5 b/s/Hz.
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Investigating self-homodyne coherent detection in a 19 channel space-division-multiplexed transmission link 査読あり
Benjamin J. Puttnam, Jun Sakaguchi, Jose Manuel Delgado Mendinueta, Werner Klaus, Yoshinari Awaji, Naoya Wada, Atsushi Kanno, Tetsuya Kawanishi
OPTICS EXPRESS 21 ( 2 ) 1561 - 1566 2013年01月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：OPTICAL SOC AMER
We investigate the performance of a self-homodyne coherent detection (SHCD) system using a 19 core multi-core fiber (MCF) and 16 wavelength-division-multiplexed channels. We show that SHCD, with the pilot-tone transmitted on a single MCF core and information carrying signals on the remaining cores, is compatible with space-division-multiplexed transmission, potentially relaxing laser linewidth and digital signal processing requirements due to phase noise cancellation. However, inter-core crosstalk can have an impact on performance and core selection. (C)2013 Optical Society of America
DOI： 10.1364/OE.21.001561
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Frequency-stabilized radio-over-fiber signal generation based on optical frequency comb source with injection-locking technique 査読あり
Atsushi Kanno, Tetsuya Kawanishi
IEEE MTT-S International Microwave Symposium Digest 2013年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
Frequency-stabilized millimeter- and submillimeter-wave radio-over-fiber (RoF) signal generation is successfully demonstrated using an injection-locking laser with an optical frequency comb (OFC) source. A frequency-shifter-based OFC generator can easily provide a frequency-locked optical component with an available bandwidth of up to 1 THz. An injection-locking technique that uses this comb improves the signal-to-noise ratio of the RoF signal without any degradation of phase noise. © 2013 IEEE.
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Frequency-reconfigurable optical-to-radio signal converter based on radio-over-fiber technology with optical frequency comb 査読あり
A. Kanno, T. Kuri, I. Morohashi, I. Hosako, T. Kawanishi, Y. Yoshida, K. Kitayama
IET Conference Publications 2013 ( 622 ) 666 - 668 2013年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
A frequency-reconfigurable radio-over-fiber (RoF) signal convertor based on an optical frequency comb is proposed for application to a millimeter-wave/ terahertz/optical hybrid system. The frequency transition from the RoF signal at 83 GHz to the higher millimeter-wave and terahertz signals is successfully demonstrated.
DOI： 10.1049/cp.2013.1495
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Frequency-Locked Optical Two-Tone THz Signal Generation with Optical Frequency Comb and Injection-Locked Laser 査読あり
Atsushi Kanno, Tetsuya Kawanishi
2013 CONFERENCE ON LASERS AND ELECTRO-OPTICS PACIFIC RIM (CLEO-PR) 2013年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
We propose an optical two-tone signal generation using an injection locking technique applied to an optical frequency comb source. An improved optical signal-to-noise ratio of greater than 10 dB is achieved.
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Evaluation of Radio-over-Fiber Link for 45-GHz- and 60-GHz-Band Simultaneous Transmissions 査読あり
A. Kanno, T. Kawanishi
2013 CONFERENCE ON AND INTERNATIONAL QUANTUM ELECTRONICS CONFERENCE LASERS AND ELECTRO-OPTICS EUROPE (CLEO EUROPE/IQEC) 2013年
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Energy and Deployment Efficiency of a Millimeter-Wave Radio-on-Radio-over-Fiber System for Railways 査読あり
Pham Tien Dat, Atsushi Kanno, Tetsuya Kawanishi
2013 OPTICAL FIBER COMMUNICATION CONFERENCE AND EXPOSITION AND THE NATIONAL FIBER OPTIC ENGINEERS CONFERENCE (OFC/NFOEC) 2013年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
We propose a radio access network for railways employing millimeter-wave Radio-onRadio- over-fiber and distributed antenna system, and evaluate its energy and deployment efficiency. We show a trade-off relation between the metrics and drive optimum system design.
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Coherent Terahertz Communication Based on DSP-Aided Radio-over-Fiber Technology 査読あり
A. Kanno, T. Kuri, I. Morohahi, I. Hosako, T. Kawanishi, Y. Yoshida, Y. Yasumura, K. Kitayama
2013 38TH INTERNATIONAL CONFERENCE ON INFRARED, MILLIMETER, AND TERAHERTZ WAVES (IRMMW-THZ) 2013年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
Coherent terahertz-signal transmission using an optical frequency comb and a high-speed digital signal processing (DSP) technology is successfully demonstrated. The DSP-aided radio-over-fiber technology can enhance the resilience of networks to disasters.
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Coherent MMW/Terahertz Signal Transmission with Frequency-Reconfigurable RoF Transmitter Based on an Optical Frequency Comb 査読あり
Atsushi Kanno, Toshiaki Kuri, Isao Morohashi, Iwao Hosako, Tetsuya Kawanishi, Yuki Yoshida, Ken-ichi Kitayama
2013 IEEE GLOBAL COMMUNICATIONS CONFERENCE (GLOBECOM) 2686 - 2691 2013年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
A frequency-reconfigurable radio-over-fiber transmitter is designed and demonstrated with an optical frequency comb source for millimeter-wave and terahertz signal transmission over a fiber-wireless hybrid link. Optical-to-radio and radio-to-optical converters with a high-speed photo mixer and frequency-heterodyne technique successfully perform coherent quadrature-phase-shift-keying signal generation and reception in the optical domain at 90 GHz and 300 GHz. A digital radio receiver also receives and demodulates the transmitted QPSK signal at 300 GHz with the same bit error rate behavior as in an optical link.
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Broadband radio-over-fiber link based on high-speed optical modulator for multi-band millimeter-wave radio 査読あり
Atsushi Kanno, Hiroyo Ogawa, Tetsuya Kawanishi, Nobuhiko Shibagaki, Hiroshi Hanyu
2013 IEEE Photonics Conference, IPC 2013 207 - 208 2013年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
We demonstrated a broadband millimeter-wave signal delivery system over an optical fiber using a high-speed optical modulator. The high spurious-free dynamic range of the system is capable of high-capacity radio signal transport. © 2013 IEEE.
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Application of InAs quantum dots for high-speed photodiodes in fiber optics 査読あり
T. Umezawa, K. Akahane, A. Kanno, T. Kawanishi
2013 Conference on Lasers and Electro-Optics Europe and International Quantum Electronics Conference, CLEO/Europe-IQEC 2013 2013年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE Computer Society
We report a new PIN photodiode using an InAs/InAsGaAs quantum-dot absorption layer with avalanche multiplication. For this photodiode, excellent I-V curves showing avalanche multiplication and a high 3-dB cutoff frequency were achieved. Designing advanced wide bandwidth avalanche photodiodes over 40 GHz is challenging [1]. A PIN structure that has a multiplied absorption layer is advantageous for realizing a short transit time in contrast to a separated absorption and multiplication (SAM) structure. Moreover, quantum dot technologies applied for obtaining high photovoltaic efficiency in solar cells are very attractive. © 2013 IEEE.
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8-GHz-bandwidth FM-CW signal generation based on optical modulation technology for W-band radar system 査読あり
Atsushi Kanno, Tetsuya Kawanishi
2013 10TH EUROPEAN RADAR CONFERENCE (EURAD) 61 - 64 2013年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
A W-band (75-110 GHz) frequency chirp signal with a bandwidth of 8 GHz and a pulse duration of 1 mu s is generated by an optical-modulator-based frequency quadrupler. The high extinction-ratio optical modulator can easily generate a clear optical two-tone signal to form a W-band signal with a high side-mode suppression ratio. The observed degradation of the single-sideband phase noise does not significantly differ from that of the theoretical limit in the frequency multiplication. We demonstrate that the frequency upconversion technique would be beneficial for an analog application that requires quality, such as in a high-precision radar system.
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210Tb/s Self-Homodyne PDM-WDM-SDM Transmission with DFB Lasers in a 19-Core Fiber 査読あり
Benjamin J. Puttnam, Jose-Manuel Delgado Mendinueta, Jun Sakaguchi, Ruben S. Luis, Werner Klaus, Yoshinari Awaji, Naoya Wada, Atsushi Kanno, Tetsuya Kawanishi
2013 IEEE PHOTONICS SOCIETY SUMMER TOPICAL MEETING SERIES 95 - + 2013年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
We demonstrate a 210Tb/s self-homodyne transmission system based on a 19-core using DFB laser transmitters and compare the transmission penalties for self-homodyne and intradyne detection in single and dual polarization schemes.
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100-GHz and 300-GHz coherent radio-over-fiber transmission using optical frequency comb source 査読あり
Atsushi Kanno, Toshiaki Kuri, Iwao Hosako, Tetsuya Kawanishi, Yoshihiro Yasumura, Yuki Yoshida, Ken-Ichi Kitayama
Proceedings of SPIE - The International Society for Optical Engineering 8645 2013年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
Millimeter-wave and sub-millimeter-wave radio-over-fiber (RoF) technology with digital-signal-processingÂ? aided coherent detection can be a promising candidate for high-speed radio transmission links with a capacity of greater than 10 Gb/s if the energy consumption does not increase drastically. We demonstrate 100-GHzÂ? and 300-GHz-band simultaneous RoF signal generation using an optical frequency comb source comprising an optical frequency shifter in an amplified optical fiber loop, and its radio transmission over the air. 10-Gbaud quadrature-phase-shift-keying provides a capacity of 18.6 Gb /s with a 7% forward error correction overhead in single carrier signal transmission as well as in multi-carrier transmission. © 2013 SPIE.
DOI： 10.1117/12.1000150
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Radio-over-fiber photonic wireless bridge in the W-Band 査読あり
Sebastian Babiel, Andreas Stohr, Atsushi Kanno, Tetsuya Kawanishi
2013 IEEE International Conference on Communications Workshops, ICC 2013 838 - 842 2013年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
In this paper, we present a photonic wireless system operating in the W-Band (75-110 GHz) featuring ultra-high bandwidth as well as simple NRZ-OOK modulation format. By using a cascaded optical RF and data modulation approach on the transmitter side, flexible adjustment of the wireless RF carrier in the W-Band is achieved, while direct electrical to optical conversion with advanced photonic components on the receiver side enables true photonic wireless bridging. In first experiments, data rates up to 10 Gb/s have been experimentally demonstrated. © 2013 IEEE.
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RF Response of PIN Photodiode with Avalanche Multiplication Using Quantum Dots 査読あり
T. Umezawa, K. Akahane, A. Kanno, T. Kawanishi
2013 CONFERENCE ON LASERS AND ELECTRO-OPTICS PACIFIC RIM (CLEO-PR) 2013年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
We fabricate a new PIN photodiode using InAs/InAlGaAs quantum dot absorption layer with an avalanche multiplication, low breakdown temperature coefficient, and high frequency response. Multiplication factors of M = 1 to M = 12 and the RF response over 10GHz are reported.
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Single mach-zehnder modulator with active Y-branch for higher than 60 dB extinction-ratio operation 査読あり
Yuya Yamaguchi, Shinya Nakajima, Atsushi Kanno, Tetsuya Kawanishi, Masayuki Izutsu, Hirochika Nakajima
IET Conference Publications 2013 ( 622 ) 930 - 932 2013年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
We investigated a lithium niobate (LiNbO3) single Mach-Zehnder modulator (MZM) with an active Y-branch, which is similar to an optical Y-branch switch. Using the modulator, we demonstrated high extinction-ratio operation (>
60 dB) and confirmed the function and the useful of the active Y-branch MZM.DOI： 10.1049/cp.2013.1583
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Two-wavelength emission laser with semiconductor quantum dots 査読あり
Kouichi Akahane, Naokatsu Yamamoto, Atsushi Kanno, Keizo Inagaki, Toshimasa Umezawa, Kawanishi Tetsuya, Takashi Endo, Yasunori Tomomatsu, Toshio Yamanoi
Pacific Rim Conference on Lasers and Electro-Optics, CLEO - Technical Digest 2013年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
A two-wavelength emission laser has been fabricated using semiconductor quantum dots as the gain medium. A beat signal of ∼100 GHz was observed using Michelson interferometer configuration, indicating that these emissions occurred simultaneously. © 2013 IEEE.
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High extinction-ratio characteristics over 60 dB Mach-Zehnder modulator with asymmetric power splitting Y-branches on X-cut Ti: LiNbO3
Yuya Yamaguchi, Shinya Nakajima, Atsushi Kanno, Tetsuya Kawanishi, Masayuki Izutsu, Hirochika Nakajima
2013 18TH MICROOPTICS CONFERENCE (MOC) 2013年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
We investigated a Mach-Zehnder modulator with asymmetric power splitting Y-branches. Output characteristics of a modulator depend on the relation between the power splitting ratios of the front and back Y-branches. By tuning the power splitting ratio of the front Y-branch, we achieved maximum power output operation and high extinction-ratio operation respectively.
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Two-wavelength emission laser with semiconductor quantum dots 査読あり
Kouichi Akahane, Naokatsu Yamamoto, Atsushi Kanno, Keizo Inagaki, Toshimasa Umezawa, Kawanishi Tetsuya, Takashi Endo, Yasunori Tomomatsu, Toshio Yamanoi
Pacific Rim Conference on Lasers and Electro-Optics, CLEO - Technical Digest 2013年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
A two-wavelength emission laser has been fabricated using semiconductor quantum dots as the gain medium. A beat signal of ∼100 GHz was observed using Michelson interferometer configuration, indicating that these emissions occurred simultaneously. © 2013 IEEE.
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Single mach-zehnder modulator with active Y-branch for higher than 60 dB extinction-ratio operation 査読あり
Yuya Yamaguchi, Shinya Nakajima, Atsushi Kanno, Tetsuya Kawanishi, Masayuki Izutsu, Hirochika Nakajima
IET Conference Publications 2013 ( 622 ) 930 - 932 2013年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
We investigated a lithium niobate (LiNbO3) single Mach-Zehnder modulator (MZM) with an active Y-branch, which is similar to an optical Y-branch switch. Using the modulator, we demonstrated high extinction-ratio operation (>
60 dB) and confirmed the function and the useful of the active Y-branch MZM.DOI： 10.1049/cp.2013.1583
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RF Response of PIN Photodiode with Avalanche Multiplication Using Quantum Dots 査読あり
T. Umezawa, K. Akahane, A. Kanno, T. Kawanishi
2013 CONFERENCE ON LASERS AND ELECTRO-OPTICS PACIFIC RIM (CLEO-PR) 2013年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
We fabricate a new PIN photodiode using InAs/InAlGaAs quantum dot absorption layer with an avalanche multiplication, low breakdown temperature coefficient, and high frequency response. Multiplication factors of M = 1 to M = 12 and the RF response over 10GHz are reported.
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Radio-over-fiber photonic wireless bridge in the W-Band 査読あり
Sebastian Babiel, Andreas Stohr, Atsushi Kanno, Tetsuya Kawanishi
2013 IEEE International Conference on Communications Workshops, ICC 2013 838 - 842 2013年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
In this paper, we present a photonic wireless system operating in the W-Band (75-110 GHz) featuring ultra-high bandwidth as well as simple NRZ-OOK modulation format. By using a cascaded optical RF and data modulation approach on the transmitter side, flexible adjustment of the wireless RF carrier in the W-Band is achieved, while direct electrical to optical conversion with advanced photonic components on the receiver side enables true photonic wireless bridging. In first experiments, data rates up to 10 Gb/s have been experimentally demonstrated. © 2013 IEEE.
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Quadrature-phase-shift-keying radio-over-fiber transmission for coherent optical and radio seamless networks 査読あり
Atsushi Kanno, Pham Tien Dat, Toshiaki Kuri, Iwao Hosako, Tetsuya Kawanishi, Yoshihiro Yasumura, Yuki Yoshida, Ken-Ichi Kitayama
IEICE Transactions on Electronics E96-C ( 2 ) 156 - 162 2013年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：Institute of Electronics, Information and Communication, Engineers, IEICE
We propose a coherent optical and radio seamless network concept that allows broadband access without deployment of additional optical fibers within an optical fiber dead zone while enhancing network resilience to disasters. Recently developed radio-over-fiber (RoF) and digital coherent detection technologies can seamlessly convert between optical and radio signals. A millimeter-wave radio with a capacity greater than 10 Gb/s and high-speed digital signal processing is feasible for this purpose. We provide a preliminary demonstration of a high-speed, W-band (75-110 GHz) radio that is seamlessly connected to an optical RoF transmitter using a highly accurate optical modulation technique to stabilize the center frequencies of radio signals. Using a W-band digital receiver with a sensitivity of -37 dBm, we successfully transmitted an 18.6Gb/s quadrature-phase-shift-keying signal through both air and an optical fiber. Copyright © 2013 The Institute of Electronics, Information and Communication Engineers.
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Power consumption of communication systems employing radio-over-fiber distributed antenna systems for railway 査読あり
Tien Dat Pham, Atsushi Kanno, Tetsuya Kawanishi
Proceedings of SPIE - The International Society for Optical Engineering 8645 2013年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
Demand on high speed communication and broadband access connection for fast moving passengers is rapidly increasing. However, the current wireless access communication techniques for railway which are mainly based on GSM for rail, satellite, and macro-cell cellular networks cannot meet the requirement of communication on fast moving trains. Cellular networks with small cell size and high carrier frequencies can be realized as a promising solution to overcome the current obstacles. In that situation, a radio-over-fiber distributed antenna system using WDM technology can be an attractive means to connect small base stations along the railway track to the control centers. However, considering a huge number of base stations placed along the railway track, power consumption will become one of the main concerns. In this paper, we investigate and optimize power consumption and energy efficiency of a Radio-over-Fiber distributed antenna system (RoF DAS) for railway. Based on the model, optimum system design in terms of remote antenna cell size and number of cells in a WDM ring are derived with respect to system energy consumption and efficiency. From the model we can also determine an appropriate scheme to upgrade a currently deployed conventional cellular network to a system employing RoF DAS technology. The power consumption and energy efficiency of the conventional and the upgraded systems are compared. The results demonstrate a significant save of power consumption and remarkable enhancement of energy efficiency when using a RoF DAS system. © 2013 SPIE.
DOI： 10.1117/12.2002382
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Phase noise measurement of optical heterodyning two-tone signal generated by two free-running lasers 査読あり
Ryuta Yamanaka, Taka Fujita, Hideyuki Sotobayashi, Atsushi Kanno, Tetsuya Kawanishi
IEICE Transactions on Electronics E96-C ( 2 ) 241 - 244 2013年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：Institute of Electronics, Information and Communication, Engineers, IEICE
We evaluated the single side-band phase noise of a 40 GHz beat signal generated by two free-running lasers. This allowed us to verify the utility of the two free-running lasers is verified as a light source for a next-generation radio-over-fiber system using frequency such as those in the millimeter-wave and terahertz bands. We also measured the phase noise of a frequency quadrupler using a Mach-Zehnder modulator for comparison. The phase noise of the two free-running lasers and the frequency quadrupler are - 63.85 and -95.22 dBc/Hz at a 10 kHz offset frequency, respectively. Copyright © 2013 The Institute of Electronics, Information and Communication Engineers.
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Performance of Wi-Fi signal transmisison-over-a seamlessly integrated radio-over-fiber and 90-GHz wireless system 査読あり
Pham Tien Dat, Atsushi Kanno, Tetsuya Kawanishi
2013 IEEE International Topical Meeting on Microwave Photonics, MWP 2013 321 - 324 2013年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE Computer Society
The transmission of a WLAN 802.11g signal over a seamlessly integrated radio-over-fiber and millimeter-wave-wireless system at 90-GHz band is analyzed theoretically and experimentally evaluated. We successfully transmitted and demodulated the signal at 18 Mb/s and 24 Mb/s using QPSK and 16-QAM modulation over the proposed system. It is shown that the quality of signal transmission was satisfied compared to the standard. © 2013 IEEE.
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Performance Evaluation of LTE Signal Transmission Over a Seamlessly Integrated Radio-Over-Fiber and Millimeter-Wave Wireless Link 査読あり
Pham Tien Dat, Atsushi Kanno, Tetsuya Kawanishi
2013 IEEE GLOBECOM WORKSHOPS (GC WKSHPS) 748 - 753 2013年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
Transmission of 3GPP LTE signal over a seamlessly integrated radio-over-fiber and millimeter-wave wireless link is theoretically analyzed and experimentally demonstrated. We successfully transmitted and demodulated standard LTE eNB conformance test signals using QPSK, 16-QAM and 64-QAM modulation format for user data over the proposed system. The measured EVM is well under the required limit defined for the test signals, showing the potential to use the link as a high capacity backhauling system for high speed mobile networks using small cells and/or high carrier frequency at millimeter-wave.
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Optical FM-CW signal generation for millimeter-wave imaging and OFDR applications 査読あり
Atsushi Kanno, Tetsuya Kawanishi
2013 IEEE Avionics, Fiber-Optics and Photonics Technology Conference, AVFOP 2013 51 - 52 2013年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE Computer Society
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Optical FM-CW signal generation for millimeter-wave and optical imaging 査読あり
Atsushi Kanno, Tetsuya Kawanishi
2013 IEEE INTERNATIONAL TOPICAL MEETING ON MICROWAVE PHOTONICS (MWP) 108 - 111 2013年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
Optical frequency-modulated continuous-wave (FM-CW) signal generation based on a high-precision optical modulation technique is successfully demonstrated for full-band millimeter-wave (MMW) radar in the W-band (75-110 GHz) and detection of an optical fiber cut by optical frequency domain reflectometry. The optical frequency up-converter based on radio-over-fiber technology creates a high-speed pulse of the FM-CW signal with broad bandwidths, and the signal degradation agrees with theoretically estimated values. The dual purpose of the optical FM-CW signal for MMW and optical imaging will be useful for a distributed antenna radar system with a MMW signal and sensing of the optical distribution network.
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Millimeter-Wave Signal Generation Using Optical Difference Frequency Generation in Rectangular Waveguide Embedded with LiTaO3 査読あり
Hiroshi Murata, Yuto Maejima, Yasuyuki Okamura, Atsushi Kanno, Tetsuya Kawanishi
2013 EUROPEAN MICROWAVE CONFERENCE (EUMC) 870 - 873 2013年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
Millimeter-wave signal generation devices using difference frequency generation based on the second order nonlinear optical effect in rectangular waveguide circuits were studied in detail theoretically and experimentally. 60GHz-band signals were successfully obtained from fabricated proto-type devices using a straight rectangular waveguide with z-cut LiTaO3 crystal. T-branching waveguide devices are also proposed to obtain an enhanced output signal.
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Large-capacity transmission over a 19-core fiber 査読あり
Jun Sakaguchi, Benjamin J. Puttnam, Werner Klaus, Jose Manuel Delgado Mendinueta, Yoshinari Awaji, Naoya Wada, Atsushi Kanno, Tetsuya Kawanishi
2013 OPTICAL FIBER COMMUNICATION CONFERENCE AND EXPOSITION AND THE NATIONAL FIBER OPTIC ENGINEERS CONFERENCE (OFC/NFOEC) 2013年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
We discuss the recent progress of space division multiplexed transmission using a 19-core fiber. We find that high core-number multi-core fibers can both enable large transmission capacity and potentially reduce system costs and power consumption.
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Impact of wave propagation delay on latency in optical communication systems 査読あり
Tetsuya Kawanishi, Atsushi Kanno, Yuki Yoshida, Ken-ichi Kitayama
OPTICAL METRO NETWORKS AND SHORT-HAUL SYSTEMS V 8646 2013年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：SPIE-INT SOC OPTICAL ENGINEERING
Latency is an important figure to describe performance of transmission systems for particular applications, such as data transfer for earthquake early warning, transaction for financial businesses, interactive services such as online games, etc. Latency consists of delay due to signal processing at nodes and transmitters, and of signal propagation delay due to propagation of electromagnetic waves. The lower limit of the latency in transmission systems using conventional single mode fibers (SMFs) depends on wave propagation speed in the SMFs which is slower than c. Photonic crystal fibers, holly fibers and large core fibers can have low effective refractive indices, and can transfer light faster than in SMFs. In free-space optical systems, signals propagate with the speed c, so that the latency could be smaller than in optical fibers. For example, LEO satellites would transmit data faster than optical submarine cables, when the transmission distance is longer than a few thousand kilometers. This paper will discuss combination of various transmission media to reduce negative impact of the latency, as well as applications of low-latency systems.
DOI： 10.1117/12.1000190
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Highly frequency-stabilized millimeter-wave signal generation using optical phase-locked loop and flat optical frequency comb 査読あり
Ryuta Yamanaka, Ryo Matsumoto, Hideyuki Sotobayashi, Atsushi Kanno, Tetsuya Kawanishi
Pacific Rim Conference on Lasers and Electro-Optics, CLEO - Technical Digest 2013年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
We demonstrated millimeter-wave signal generation using optical phase-locked loop and flat optical frequency comb generation using a Mach-Zehnder modulator. The generated optical multi-tone signal has high frequency stability and optical signal-to-noise ratio. © 2013 IEEE.
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Characterization of APD-PIN photodiodes using InAs/InAlGaAs quantum-dot absorption layer
T. Umezawa, K. Akahane, A. Kanno, T. Kawanishi
CLEO: Science and Innovations, CLEO_SI 2013 CTh4J.8 2013年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
We found avalanche multiplications in InAs/InAlGaAs quantum-dot PIN photodiodes, and characterized the temperature dependence of I-V curves, the multiplication factors and the RF responses. © OSA 2013.
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Coherent optical and radio seamless transmission based on DSP-aided radio-over-fiber technology
Atsushi Kanno, Toshiaki Kuri, Iwao Hosako, Tetsuya Kawanishi, Yuki Yoshida, Yoshihiro Yasumura, Ken-Ichi Kitayama
2013 Optical Fiber Communication Conference and Exposition and the National Fiber Optic Engineers Conference, OFC/NFOEC 2013 2013年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
We propose and demonstrate a coherent optical and radio seamless transmission system for enhancing network resilience. By using radio-over-fiber technology with digital-signal-processing-aided coherent detection, high capacity optical/radio transmission can be achieved. © 2013 OSA.
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Optical and millimeter-wave radio seamless MIMO transmission based on a radio over fiber technology 査読あり
Atsushi Kanno, Toshiaki Kuri, Iwao Hosako, Tetsuya Kawanishi, Yuki Yoshida, Yoshihiro Yasumura, Ken-ichi Kitayama
OPTICS EXPRESS 20 ( 28 ) 29395 - 29403 2012年12月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：OPTICAL SOC AMER
Multi-input multi-output (MIMO) transmission of two millimeter-wave radio signals seamlessly converted from polarization-division-multiplexed quadrature-phase-shift-keying optical signals is successfully demonstrated, where a radio access unit basically consisting of only optical-to-electrical converters and a radio receiver performs total signal equalization of both the optical and the radio paths and demodulation with digital signal processing (DSP). Orthogonally polarized optical components that are directly converted to two-channel radio components can be demultiplexed and demodulated with high-speed DSP as in optical digital coherent detection. 20-Gbaud optical and radio seamless MIMO transmission provides a total capacity of 74.4 Gb/s with a forward error correction overhead of 7%. (C) 2012 Optical Society of America
DOI： 10.1364/OE.20.029395
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Polarization division multiplexed 4 x 10 Gbps simultaneous transmissions in 1.0-mu m waveband and C-waveband over a 14.4-km-long holey fiber using an ultra-broadband photonic transport system 査読あり
Yu Omigawa, Naokatsu Yamamoto, Atsushi Kanno, Tetsuya Kawanishi, Yasuaki Kurata, Hideyuki Sotobayashi
OPTICS EXPRESS 20 ( 14 ) 14864 - 14870 2012年07月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：OPTICAL SOC AMER
Polarization division multiplexing (PDM) and wavelength division multiplexing (WDM) are essential techniques for enhancing the capacity of photonic networks and facilitating the efficient use of optical frequency resources. 2 PDM x 2 WDM x 10 Gbps error-free simultaneous transmissions in the 1.0-mu m waveband and C-waveband are successfully demonstrated for the first time using an ultra-broadband photonic transport system over a 14.4-km-long holey fiber transmission line. (c) 2012 Optical Society of America
DOI： 10.1364/OE.20.014864
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19-core fiber transmission of 19x100x172-Gb/s SDM-WDM-PDM-QPSK signals at 305Tb/s 査読あり
Jun Sakaguchi, Benjamin J. Puttnam, Werner Klaus, Yoshinari Awaji, Naoya Wada, Atsushi Kanno, Tetsuya Kawanishi, Katsunori Imamura, Harumi Inaba, Kazunori Mukasa, Ryuichi Sugizaki, Tetsuya Kobayashi, Masayuki Watanabe
2012 Optical Fiber Communication Conference(OFC) PDP5C.1 2012年03月
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Space Division Multiplexed Transmission of 109-Tb/s Data Signals Using Homogeneous Seven-Core Fiber
Jun Sakaguchi, Yoshinari Awaji, Naoya Wada, Atsushi Kanno, Tetsuya Kawanishi, Tetsuya Hayashi, Toshiki Taru, Tetsuya Kobayashi, Masayuki Watanabe
JOURNAL OF LIGHTWAVE TECHNOLOGY 30 ( 4 ) 658 - 665 2012年02月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
We achieved record 109-Tb/s transmission over 16.8 km, using space division multiplexing (SDM) together with conventional multiplexing technology. 7-core SDM, 97 WDM (100-GHz spacing), 2 x 86 Gb/s PDM-QPSK signals were used. The spectral efficiency was 11.2 b/s/Hz. SDM transmission was realized using a multi-core fiber with ultra-low-crosstalk (less than -90.0 dB/km at 1550 nm) and high performance SDM MUX/DEMUX. The overall SDM crosstalk of -53 dB caused almost no penalty for the PDM-QPSK transmission.
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Space Division Multiplexed Transmission of 109-Tb/s Data Signals Using Homogeneous Seven-Core Fiber
Jun Sakaguchi, Yoshinari Awaji, Naoya Wada, Atsushi Kanno, Tetsuya Kawanishi, Tetsuya Hayashi, Toshiki Taru, Tetsuya Kobayashi, Masayuki Watanabe
JOURNAL OF LIGHTWAVE TECHNOLOGY 30 ( 4 ) 658 - 665 2012年02月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
We achieved record 109-Tb/s transmission over 16.8 km, using space division multiplexing (SDM) together with conventional multiplexing technology. 7-core SDM, 97 WDM (100-GHz spacing), 2 x 86 Gb/s PDM-QPSK signals were used. The spectral efficiency was 11.2 b/s/Hz. SDM transmission was realized using a multi-core fiber with ultra-low-crosstalk (less than -90.0 dB/km at 1550 nm) and high performance SDM MUX/DEMUX. The overall SDM crosstalk of -53 dB caused almost no penalty for the PDM-QPSK transmission.
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Extinction-Ratio-Independent Method for Total Chirp Measurement of Integrated Parallel Mach-Zehnder-Modulators 査読あり
Pham Tien Dat, Atsushi Kanno, Keizo Ingaki, Tetsuya Kawanishi
2012 IEEE INTERNATIONAL TOPICAL MEETING ON MICROWAVE PHOTONICS (MWP) 128 - 131 2012年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
A method is proposed for measuring total chirp of integrated parallel Mach-Zehnder-type modulators by analyzing optical spectrum components. It can be applied to characterize the integrated modulators with finite extinction ratio and permit to evaluate the chirp parameter at a specific frequency. An experiment measurement is then conducted to demonstrate the proposed method for an optical FSK modulator. The obtained result reveals the effectiveness of this chirp measurement method.
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Digital-Signal-Processing-Aided Ultra-High-Speed Radio-over-Fiber Technology for Highly Resilient Mobile Backhaul 査読あり
Toshiaki Kuri, Atsushi Kanno, Iwao Hosako, Tetsuya Kawanishi, Yoshihiro Yasumura, Yuki Yoshida, Ken-ichi Kitayama
2012 IEEE INTERNATIONAL TOPICAL MEETING ON MICROWAVE PHOTONICS (MWP) 84 - 87 2012年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
This paper describes a scenario of highly resilient mobile backhaul using the radio-over-fiber (RoF) technology. RoF-based millimeter-wave high-speed transmission is useful for quick recovery from severe physical damage of the network infrastructure. As a possible approach, we demonstrated polarization division multiplexing optical and 2x2 multi-input multi-output radio seamless hybrid downlink transmission over 20-km-long standard single mode fiber and 0.9-m free space with a digital signal processing technique for the 10-Gbaud QPSK format.
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Coherent Wired/Wireless Seamless Transmission with Combination of Photonic Digital and Analogue Techniques 査読あり
Atsushi Kanno, Toshiaki Kuri, Iwao Hosako, Tetsuya Kawanishi, Yuki Yoshida, Ken-ichi Kitayama
2012 IEEE PHOTONICS CONFERENCE (IPC) 636 - + 2012年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
Digital coherent detection and radio-over-fiber technologies allow the realization of direct seamless conversion between optical and radio networks. We propose a photonic digital transmission with analogue signal synthesis technique to provide high-speed simultaneous transmissions.
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Coherent radio-over-fiber and millimeter-wave radio seamless transmission system for resilient access networks 査読あり
A. Kanno, P. T. Dat, T. Kuri, I. Hosako, T. Kawanishi, Y. Yoshida, Y. Yasumura, K. Kitayama
IEEE Photonics Journal 4 ( 6 ) 2196 - 2204 2012年
記述言語：英語 掲載種別：研究論文（学術雑誌）
We propose a millimeter-wave (MMW) coherent radio-over-fiber (RoF) transmission system for application to an access network with a direct broadband last-mile wireless connection to an optical fiber network. The coherent RoF system comprises an optical two-tone RoF signal generator with an advanced modulation format for high-throughput transmission and employs a digital-signal-processing-aided coherent detection technique for MMW radio, which is a technique similar to that of optical digital coherent detection. As proof of concept, a 20-GBd quadrature phase-shift keying RoF transmission over 20 km of optical fiber before a radio transmission over 20 m of air is demonstrated. The results of the radio transmissions using Cassegrain-type antenna pairs with a gain of 50 dBi are consistent with theoretical estimations
this suggests the possibility of developing a midrange transmission system using a high-power MMW amplifier. © 2012 IEEE. -
Carrier frequency offset compensation for 10-Gbaud QPSK RoF transmission at 90 GHz with free-running optical LO signal 査読あり
Atsushi Kanno, Toshiaki Kuri, Iwao Hosako, Tetsuya Kawanishi, Yoshihiro Yasumura, Yuki Yoshida, Ken-Ichi Kitayama
IEEE MTT-S International Microwave Symposium Digest 2012年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
We demonstrate W-band (75-110 GHz) RoF radio signal transmission with two free-running lasers using an optical heterodyne technique. The combination of a laser located at a base station for the optical local oscillator and a data-modulated optical signal from a central office provides a W-band radio signal. The carrier frequency offset fluctuation within 6 MHz can be mitigated by digital signal processing at the receiver side, in a similar manner to that of optical digital coherent detection. © 2012 IEEE.
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Analyses of carrier frequency fluctuation of W-band RoF signals using two free-running lasers for high-speed RoF transmission 査読あり
Atsushi Kanno, Toshiaki Kuri, Iwao Hosako, Tetsuya Kawanishi, Yoshihiro Yasumura, Yuki Yoshida, Ken-ichi Kitayama
2012 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO) 2012年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
We analyze a carrier frequency fluctuation for RoF transmission with two freer running lasers. Obtained fluctuation within 6 MHz can be mitigated by digital signal processing as a same manner of digital coherent detection. (C) 2011 Optical Society of America
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90-GHz Radio-on-Radio-over-Fiber System for Linearly Located Distributed Antenna Systems 査読あり
Atsushi Kanno, Pham Tien Dat, Tetsuya Kawanishi, Naruto Yonemoto, Nobuhiko Shibagaki
2012 PHOTONICS GLOBAL CONFERENCE (PGC) 2012年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
To realize a high-speed and high-capacity transmission link for fast mobile vehicles such as a bullet train, we propose a wavelength-division-muitiplexing radio-on-radio-over-fiber (WDM-RoRoF) system with a linearly located distributed antenna system (DAS) on the 90-GHz band. All the conventional microwave (MW) radio signals such as mobile telecommunication and broadcast signals are encapsulated in a single millimeter-wave (MMW) carrier radio. Centralized control at a central office using the information of the position of a car can optimize and distribute the suitable RoRoF signal to each remote cell over optical fibers. An optical two-tone generator with an optical modulator can easily generate a 90-GHz RoRoF signal, and then, a high-speed photomixer directly converts from an RoRoF signal to an MMW RoR signal, which is composed of an MW signal with a 90-GHz carrier component, for irradiation over air. Heterodyne frequency down-conversion performs the direct frequency conversion from the MMW signal to an MW signal available to consumers.
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20-Gbaud QPSK RoF and millimeter-wave radio transmission 査読あり
Atsushi Kanno, Toshiaki Kuri, Iwao Hosako, Tetsuya Kawanishi, Yoshihiro Yasumura, Yuki Yoshida, Ken-Ichi Kitayama
Technical Digest - 2012 17th Opto-Electronics and Communications Conference, OECC 2012 735 - 736 2012年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
We successfully demonstrate 20-Gbaud (37.38 Gb/s) QPSK RoF and 100-GHz radio transmission over 20-km SMF and 0.3-m air. ADC with a bandwidth of 30 GHz can demodulate 40-GHz-bandwidth signal using digital coherent detection technique. © 2012 IEEE.
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20-Gbaud QPSK optical and radio transmission using high-gain antennas for resilient access networks 査読あり
Atsushi Kanno, Pham Tien Dat, Toshiaki Kuri, Iwao Hosako, Tetsuya Kawanishi, Yuki Yoshida, Yoshihiro Yasumura, Ken-Ichi Kitayama
2012 IEEE Photonics Society Summer Topical Meeting Series, PSST 2012 145 - 146 2012年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
20-Gbaud QPSK transmission over 20-km SMF for optical and 7.5-m free space for 90-GHz radio is successfully demonstrated with 50-dBi Cassegrain antennas. This configuration will be feasible for kilometer-order distance transmission. © 2012 IEEE.
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16-Gbaud QPSK Radio Transmission using Optical Frequency Comb with Recirculating Frequency Shifter for 300-GHz RoF Signal 査読あり
Atsushi Kanno, Isao Morohashi, Toshiaki Kuri, Iwao Hosako, Tetsuya Kawanishi, Yoshihiro Yasumura, Yuki Yoshida, Ken-ichi Kitayama
2012 IEEE INTERNATIONAL TOPICAL MEETING ON MICROWAVE PHOTONICS (MWP) 298 - 301 2012年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
We demonstrate 300-GHz-band radio transmission with a digital coherent detection technique. Quadrature-phase-shift-keying modulation can provide a data rate of 29.9 Gb/s, with 7% forward error correction overhead. A frequency-locked optical frequency comb for a 300-GHz radio-over-fiber signal can be generated by a recirculating frequency shifter with a single-sideband suppressed-carrier modulator in an amplified optical fiber loop.
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SDM technology beyond 100 Tb/s 査読あり
J. Sakaguchi, B. J. Puttnam, W. Klaus, Y. Awaji, N. Wada, A. Kanno, T. Kawanishi
Technical Digest - 2012 17th Opto-Electronics and Communications Conference, OECC 2012 553 - 554 2012年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
We review our progress in space division multiplexed (SDM) transmission technology enabling 100-300 Tb/s transmission. As the key components, we describe our free-space SDM multiplexer (MUX) and demultiplexer (DEMUX) and novel multi-core fibers. © 2012 IEEE.
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High-Speed Frequency Control for Optical Data Transmission and Radio-on-Fiber Systems 査読あり
Tetsuya Kawanishi, Atsushi Kanno, Keizo Inagaki
2012 14TH INTERNATIONAL CONFERENCE ON TRANSPARENT OPTICAL NETWORKS (ICTON 2012) 2012年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
This presentation focuses on high-speed frequency control of radio-wave and lightwave signals using optical modulation. Frequency multiplication in optical modulators also plays important roles. Optical two-tone signals whose frequency separation can be up to 160 GHz would be useful for reference signals in array antennas, photodetector estimation, etc. In addition, this technique can be applicable for radar sensing, signal monitoring and performance diagnostics.
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SDM technology beyond 100 Tb/s 査読あり
J. Sakaguchi, B. J. Puttnam, W. Klaus, Y. Awaji, N. Wada, A. Kanno, T. Kawanishi
Technical Digest - 2012 17th Opto-Electronics and Communications Conference, OECC 2012 553 - 554 2012年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
We review our progress in space division multiplexed (SDM) transmission technology enabling 100-300 Tb/s transmission. As the key components, we describe our free-space SDM multiplexer (MUX) and demultiplexer (DEMUX) and novel multi-core fibers. © 2012 IEEE.
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Polarization division multiplexed 2x10-Gbps transmissions over 10-km long holey fiber in 1.0-mu m waveband photonic transport system 査読あり
Naokatsu Yamamoto, Atsushi Kanno, Kouichi Akahane, Tetsuya Kawanishi, Yu Omigawa, Yasuaki Kurata, Hideyuki Sotobayashi
OPTICAL METRO NETWORKS AND SHORT-HAUL SYSTEMS IV 8283 2012年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：SPIE-INT SOC OPTICAL ENGINEERING
Photonic transport systems in the C+L bands have been extensively employed in conventional networks. The continuously expanding demand for greater photonic network capacities has created the need for the use of additional wavebands to strengthen the transmission capacities. We recently focused on the use of a novel wavelength band such as 1.0-mu m (thousand band: T band), together with the conventional C and L bands, to enhance the usable optical frequency resources in future photonic networks employing waveband division multiplexing. Furthermore, we successfully demonstrated an ultra-broadband T-band photonic transport system using a holey fiber (HF) transmission line to create a wide range of usable optical frequency resources over 8.4 THz (wavelength range: 1037-1068 nm). In constructing an ultra-broadband photonic transport system for the T, C, and L bands, HF is considered to be a great candidate for an ultra-broadband and high-capacity data transmission line. In this study, we demonstrated a polarization division multiplexing (PDM) photonic transport system for doubling the optical frequency resources in the T band. Error-free PDM photonic transmissions in the T band with a clear eye opening at 10 Gb/s were successfully achieved over a long distance using an 11.4-km HF transmission line for the first time. To upgrade the present photonic network system, we believe the technologies of the demonstrated T-band PDM, together with WDM photonic transport systems using the >10-km long HF transmission line, represent a pioneering breakthrough in the use of ultra-broadband optical frequency resources.
DOI： 10.1117/12.907955
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Phase noise analysis of an optical frequency comb using single side-band suppressed carrier modulation in an amplified optical fiber loop 査読あり
Atsushi Kanno, Tetsuya Kawanishi
IEICE ELECTRONICS EXPRESS 9 ( 18 ) 1473 - 1478 2012年
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG
Coherent optical two-tone generation using an optical frequency comb generator based on an amplified optical fiber loop is successfully demonstrated. The observed phase noises in the 100-GHz band are less than -80 dBc/Hz at 1 MHz. This method is suitable for high-speed radio communication based on advanced modulation techniques.
DOI： 10.1587/elex.9.1473
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Optical and Radio Seamless MIMO Transmission with 20-Gbaud QPSK 査読あり
Atsushi Kanno, Toshiaki Kuri, Iwao Hosako, Tetsuya Kawanishi, Yoshihiro Yasumura, Yuki Yoshida, Ken-ichi Kitayama
2012 38TH EUROPEAN CONFERENCE AND EXHIBITION ON OPTICAL COMMUNICATIONS (ECOC) 2012年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
MIMO radio transmission seamlessly converted from an optical DP-QPSK signal is performed with a polarization- diversity digital coherent detection technique. Obtained total capacity of radio transmission is achieved 74.4 Gb/s with 7% FEC overhead.
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LiNbO 3 modulator for modern optical communications 査読あり
Tetsuya Kawanishi, Atsushi Kanno
Technical Digest - 2012 17th Opto-Electronics and Communications Conference, OECC 2012 65 - 66 2012年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
This paper describes recent progress of highspeed lithium niobate (LN) modulator technologies for digital and analogue applications. LN provides precise and high-speed optical modulation. Various types of signals can be generated by using integrated devices. © 2012 IEEE.
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Large-scale space division multiplexed transmission through multi-core fiber 査読あり
Jun Sakaguchi, Benjamin J. Puttnam, Werner Klaus, Yoshinari Awaji, Naoya Wada, Atsushi Kanno, Tetsuya Kawanishi
2012 ASIA COMMUNICATIONS AND PHOTONICS CONFERENCE (ACP) 2012年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
Rapid progress in multi-core fibers and space division multiplexing technologies has enabled large-capacity transmission exceeding the conventional single-core fiber capacity limit of approximately 100 Tb/s. In this invited paper, we review such progress and achievements.
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Investigating Self-Homodyne Coherent Detection in a 19-core Spatial-Division-Multiplexed Transmission Link 査読あり
Benjamin J. Puttnam, Jun Sakaguchi, Werner Klaus, Yoshinari Awaji, Jose-Manuel Delgado Mendinueta, Naoya Wada, Atsushi Kanno, Tetsuya Kawanishi
2012 38TH EUROPEAN CONFERENCE AND EXHIBITION ON OPTICAL COMMUNICATIONS (ECOC) Tu.3.C.3 2012年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
We investigate the performance of self-homodyne coherent system based on 19(star) SDM and 16(star) WDM channels. We show that self-homodyne detection, with pilot-tone transmitted on 1 MCF core, is compatible with SDM transmission systems but inter-core crosstalk can limit potential advantages.
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40 Gb/s W-band (75-110 GHz) 16-QAM radio-over-fiber signal generation and its wireless transmission 査読あり
Atsushi Kanno, Keizo Inagaki, Isao Morohashi, Takahide Sakamoto, Toshiaki Kuri, Iwao Hosako, Tetsuya Kawanishi, Yuki Yoshida, Ken-ichi Kitayama
OPTICS EXPRESS 19 ( 26 ) 56 - 63 2011年12月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：OPTICAL SOC AMER
The generation of a 40-Gb/s 16-QAM radio-over-fiber (RoF) signal and its demodulation of the wireless signal transmitted over free space of 30 mm in W-band (75-110 GHz) is demonstrated. The 16-QAM signal is generated by a coherent polarization synthesis method using a dual-polarization QPSK modulator. A combination of the simple RoF generation and the versatile digital receiver technique is suitable for the proposed coherent optical/wireless seamless network. (C) 2011 Optical Society of America
DOI： 10.1364/OE.19.000B56
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Synthesis of 16 Quadrature Amplitude Modulation Using Polarization-Multiplexing QPSK Modulator
Isao Morohashi, Takahide Sakamoto, Masaaki Sudo, Atsushi Kanno, Akito Chiba, Junichiro Ichikawa, Tetsuya Kawanishi
IEICE TRANSACTIONS ON COMMUNICATIONS E94B ( 7 ) 1809 - 1814 2011年07月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG
We propose a polarization-multiplexing QPSK modulator for synthesis of a 16 QAM signal. The generation mechanism of 16 QAM is based on an electro-optic vector digital-to-analog converter, which can generate optical multilevel signals from binary electric data sequences. A quad-parallel Mach-Zehnder modulator (QPMZM) used in our previous research requires precise control of electric signals or fabrication of a variable optical attenuator, which significantly raises the degree of difficulty to control electric signals or device fabrication. To overcome this difficulty, we developed the polarization-multiplexing QPSK modulator, which improved the method of superposition of QPSK signals. In the polarization-multiplexing QPSK modulator, two QPSK signals are output with orthogonal polarization and superposed through a polarizer. The amplitude ratio between the two QPSK signals can be precisely controlled by rotating the polarizer to arrange the 16 symbols equally. Generation of 16 QAM with 40 Gb/s and a bit error rate of 5.69 x 10(-5) was successfully demonstrated using the polarization-multiplexing QPSK modulator. This modulator has simpler configuration than the previous one, utilized a dual-polarization MZM, alleviating complicated control of electric signals.
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90 Gbaud NRZ-DP-DQPSK Modulation with Full-ETDM Technique Using High-Speed Optical IQ Modulator 査読あり
Atsushi Kanno, Takahide Sakamo, Akito Chiba, Masaaki Sudo, Kaoru Higuma, Junichiro Ichikawa, Tetsuya Kawanishi
IEICE TRANSACTIONS ON ELECTRONICS E94C ( 7 ) 1179 - 1186 2011年07月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG
We demonstrate high baud-rate DQPSK modulation with full-ETDM technique using a novel high-speed optical IQ modulator consisting of a ridge-type optical waveguide structure on a thin LiNbO3 substrate. Our fabrication technique achieves a drastic extension of the modulator's bandwidth and a reduction of half-wave voltage. Demonstration of 90-Gbaud NRZ-DP-DQPSK signal generation with the modulator successfully achieved a bit rate of 360-Gb/s under full-ETDM configuration.
DOI： 10.1587/transele.E94.C.1179
その他リンク： http://dblp.uni-trier.de/db/journals/ieicet/ieicet94c.html#journals/ieicet/KannoSCSHIK11
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Synthesis of 16 Quadrature Amplitude Modulation Using Polarization-Multiplexing QPSK Modulator
Isao Morohashi, Takahide Sakamoto, Masaaki Sudo, Atsushi Kanno, Akito Chiba, Junichiro Ichikawa, Tetsuya Kawanishi
IEICE TRANSACTIONS ON COMMUNICATIONS E94B ( 7 ) 1809 - 1814 2011年07月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG
We propose a polarization-multiplexing QPSK modulator for synthesis of a 16 QAM signal. The generation mechanism of 16 QAM is based on an electro-optic vector digital-to-analog converter, which can generate optical multilevel signals from binary electric data sequences. A quad-parallel Mach-Zehnder modulator (QPMZM) used in our previous research requires precise control of electric signals or fabrication of a variable optical attenuator, which significantly raises the degree of difficulty to control electric signals or device fabrication. To overcome this difficulty, we developed the polarization-multiplexing QPSK modulator, which improved the method of superposition of QPSK signals. In the polarization-multiplexing QPSK modulator, two QPSK signals are output with orthogonal polarization and superposed through a polarizer. The amplitude ratio between the two QPSK signals can be precisely controlled by rotating the polarizer to arrange the 16 symbols equally. Generation of 16 QAM with 40 Gb/s and a bit error rate of 5.69 x 10(-5) was successfully demonstrated using the polarization-multiplexing QPSK modulator. This modulator has simpler configuration than the previous one, utilized a dual-polarization MZM, alleviating complicated control of electric signals.
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20-Gb/s QPSK W-band (75-110GHz) wireless link in free space using radio-over-fiber technique
Atsushi Kanno, Keizo Inagaki, Isao Morohashi, Takahide Sakamoto, Toshiaki Kuri, Iwao Hosako, Tetsuya Kawanishi, Yuki Yoshida, Ken-ichi Kitayama
IEICE ELECTRONICS EXPRESS 8 ( 8 ) 612 - 617 2011年04月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG
We demonstrate 20-Gb/s W-band wireless transmission in free space with a distance of 30 mm using optical signal generation. Optically synthesized QPSK signal and direct optical upconversion technique ease generation of W-band RoF signals for dual purpose of wireline and wireless transmission link. A W-band radio receiver with W-band frequency downconversion and digital signal processing will be applicable for any W-band radio detection.
DOI： 10.1587/elex.8.612
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Development of Broadband Optical Frequency Resource over 8.4 THz in 1.0-mu m Waveband for Photonic Transport Systems 査読あり
Naokatsu Yamamoto, Yu Omigawa, Yuta Kinoshita, Atsushi Kanno, Kouichi Akahane, Tetsuya Kawanishi, Hideyuki Sotobayashi
BROADBAND ACCESS COMMUNICATION TECHNOLOGIES V 7958 2011年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：SPIE-INT SOC OPTICAL ENGINEERING
Continually expanding demand for greater photonic network capacities has created a need for the use of alternative wavebands and development of methods to strengthen transmission capacities. Photonic transport systems in the C band (1530-1565 nm, 4.3-THz bandwidth) and L band (1565-1625 nm, 7.1-THz bandwidth) have been extensively employed in conventional networks. We recently focused on use of a novel wavelength band such as 1.0-mu m (thousand band: T band) together with the conventional C and L bands for enhancing usable optical frequency resources in future photonic networks employing wavelength division multiplexing (WDM). Therefore, here, we develop an ultra-broadband photonic transport system in the T band to create novel optical frequency resources in that waveband. In the proposed system, a holey fiber (HF) transmission line has been developed that is capable of ultra-broadband data transmission. In this study, we demonstrated ultra-broadband, 10-Gbps, error-free operation in a T-band photonic transport system using a wavelength tunable light source and an HF transmission line (typically > 3.3 km). We successfully developed ultra-broadband transmission capability beyond the 8.4-THz bandwidth (1037-1068 nm), from usable optical frequency resources in the T band. In this band we also successfully demonstrate a polarization division multiplexing (PDM) photonic transport system for achieving efficient use of optical frequency resources. To construct the photonic network system of the future, we believe the technologies of the demonstrated T-band photonic transport systems using the HF transmission line represent a pioneering breakthrough in the use of ultra-broadband optical frequency resources.
DOI： 10.1117/12.874561
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40 Gb/s W-band (75-110 GHz) 16-QAM radio-over-fiber signal generation and its wireless transmission 査読あり
Atsushi Kanno, Keizo Inagaki, Isao Morohashi, Takahide Sakamoto, Toshiaki Kuri, Iwao Hosako, Tetsuya Kawanishi, Yuki Yoshida, Ken-ichi Kitayama
2011 37TH EUROPEAN CONFERENCE AND EXHIBITION ON OPTICAL COMMUNICATIONS (ECOC 2011) 19 B56 - 63 2011年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
40-Gb/s W-band 16-QAM radio-over-fiber signal is optically synthesized using dual-polarization QPSK modulator. Its wireless transmission within FEC limit is demonstrated with optical self-heterodyne detection and digital signal processing.
DOI： 10.1364/OE.19.000B56
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2.56 × 1017 Hz/s frequency chirp signal generation using DSB-SC optical modulation without optical filters 査読あり
Atsushi Kanno, Shinnosuke Honda, Ryuta Yamanaka, Hideyuki Sotobayashi, Tetsuya Kawanishi
2011 Conference on Lasers and Electro-Optics Europe and 12th European Quantum Electronics Conference, CLEO EUROPE/EQEC 2011 2011年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
Broadband and ultrafast frequency sweep signal generation technique has been desired in radar applications as well as signal sources for ultra-wideband wireless communication [1]. Optical signal generation technique is a possible candidate for ultra-broadband signal generation although all electrical one is difficult to apply due to its bandwidth. In conventional modulation technique, however, an extinction ratio of an optical modulator, which is typically around 20 dB, could require optical filters for rejection of unnecessary harmonics and tones. High extinction ratio (HER) optical modulator with a structure of dual-parallel Mach-Zehnder interferometer (DPMZI) achieved the extinction ratio of 70 dB [2, 3]. Thus, simple and robust system configuration without optical filters can be possible with the modulator. In this paper, we demonstrated ultrafast and broadband electrical frequency chirped signal generation with the bandwidth of 12.8 GHz and the repetition rate of 20 MHz using the HER modulator. © 2011 IEEE.
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160-Gb/s Orthogonal Time-Frequency Domain Multiplexed QPSK for Ultra-High-spectral-Efficient Transmission 査読あり
Takahide Sakamoto, Atsushi Kanno, Tetsuya Kawanishi, Nicolas K. Fontaine, David J. Geisler, Ryan P. Scott, S. J. B. Yoo
2011 37TH EUROPEAN CONFERENCE AND EXHIBITION ON OPTICAL COMMUNICATIONS (ECOC 2011) 2011年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
We demonstrate optical orthogonal time-frequency domain multiplexing (OTFDM), which inherits the advantages of high-speed OTDM and high-spectral-efficient OFDM. SinglePol., 2-b/s/Hz, 160-Gb/s OTFDM-QPSK is achieved by optical time-domain processing.
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109-Tb/s (7x97x172-Gb/s SDM/WDM/PDM) QPSK transmission through 16.8-km homogeneous multi-core fiber 査読あり
Jun Sakaguchi, Yoshinari Awaji, Naoya Wada, Atsushi Kanno, Tetsuya Kawanishi, Tetsuya Hayashi, Toshiki Taru, Tetsuya Kobayashi, Masayuki Watanabe
2011 OPTICAL FIBER COMMUNICATION CONFERENCE AND EXPOSITION (OFC/NFOEC) AND THE NATIONAL FIBER OPTIC ENGINEERS CONFERENCE PDPB6 2011年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：OPTICAL SOC AMERICA
We demonstrate record 109-Tb/s transmission of spatial division multiplexed (SDM) signals over 16.8 km using a seven-core fiber. Each SDM channel contains 97 WDM channels on a 100-GHz grid and 2x86-Gb/s polarization-multiplexed QPSK signals.
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10-Gb/s/ch QPSK FDM W-band radio-over-fiber signal generation, free-space radio transmission, and its demodulation 査読あり
Atsushi Kanno, Keizo Inagaki, Isao Morohashi, Toshiaki Kuri, Iwao Hosako, Tetsuya Kawanishi, Yuki Yoshida, Ken-Ichi Kitayama
2011 IEEE International Topical Meeting on Microwave Photonics - Jointly Held with the 2011 Asia-Pacific Microwave Photonics Conference, MWP/APMP 2011 393 - 396 2011年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
10-Gb/s/ch frequency-division-multiplexing (FDM) radio-over-fiber (RoF) signal generation and free-space transmission in W-band (75-110 GHz) are successfully demonstrated. The FDM quadrature-phaseshift-keying (QPSK) signals with 3 channels are optically generated and transmitted over 30-cm radio link. Digital signal processing with W-band mixer realizes successful demodulation of its FDM radio signal. © 2011 IEEE.
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Ultra Wideband Frequency Chirp Millimetre-Wave Signal Generation Using Electro-Optic Modulation 査読あり
Tetsuya Kawanishi, Takahide Sakamoto, Atsushi Kanno
2011 13TH INTERNATIONAL CONFERENCE ON TRANSPARENT OPTICAL NETWORKS (ICTON) 2011年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
We describe ultra wideband frequency control of millimetre-wave and lightwave signals using optical single-sideband modulation. Precise and rapid frequency control can be achieved by digital arbitrary waveform generation and high-speed electro-optic modulation. Frequency multiplication in optical modulators also plays important roles. Ultra-wideband frequency chirp signals from 9.6 GHz to 16 GHz, which were generated by using a computer controlled arbitrary waveform generator and a wideband frequency multiplier, were fed to an optical single-sideband modulator consisting of two sub Mach-Zehnder interferometers.
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Vector Modulation Technologies for High-Speed Optical Transmission 査読あり
Tetsuya Kawanishi, Takahide Sakamoto, Akito Chiba, Atsushi Kanno
2010 12TH INTERNATIONAL CONFERENCE ON TRANSPARENT OPTICAL NETWORKS (ICTON) 2011年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
We present lightwave modulation techniques for high-speed signal generation in digital and analogue applications. Advanced modulation formats, such as differential quadrature phase-shift-keying, amplitude-and phase-shift-keying, quadrature-amplitude-modulation etc, were investigated to obtain enhanced spectral efficiency, where Mach-Zehnder modulators (MZMs) are commonly used to control optical amplitude or phase in lightwave signals. In this presentation, we describe lightwave modulation techniques for high-speed signal generation based on integrated MZMs. By using quad-parallel MZM, high-speed optical 16-QAM signals can be synthesized, where the baud rate and bit rate were 12.5 Gbaud and 50 Gb/s. Impact of extinction-ratio (ER) of MZMs on advanced modulation formats is also discussed. Imbalance in the MZMs due to fabrication error can be compensated by using a dual-parallel MZM. ER can be higher than 70 dB.
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Highly stabilized frequency-locked optical frequency comb signal generation using amplified optical fiber loop with SSB-SC modulation 査読あり
Atsushi Kanno, Takahide Sakamoto, Tetsuya Kawanishi
2011 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO) 2011年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
Frequency-locked optical frequency comb generation was successfully demonstrated with SSB-SC modulation loop technique. We show no significant effect on the frequency comb signal with changes of loop length from 0 mm to 5 mm. (C) 2010 Optical Society of America
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Vector Modulation Technologies for High-Speed Optical Transmission 査読あり
Tetsuya Kawanishi, Takahide Sakamoto, Akito Chiba, Atsushi Kanno
2010 12TH INTERNATIONAL CONFERENCE ON TRANSPARENT OPTICAL NETWORKS (ICTON) 2011年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
We present lightwave modulation techniques for high-speed signal generation in digital and analogue applications. Advanced modulation formats, such as differential quadrature phase-shift-keying, amplitude-and phase-shift-keying, quadrature-amplitude-modulation etc, were investigated to obtain enhanced spectral efficiency, where Mach-Zehnder modulators (MZMs) are commonly used to control optical amplitude or phase in lightwave signals. In this presentation, we describe lightwave modulation techniques for high-speed signal generation based on integrated MZMs. By using quad-parallel MZM, high-speed optical 16-QAM signals can be synthesized, where the baud rate and bit rate were 12.5 Gbaud and 50 Gb/s. Impact of extinction-ratio (ER) of MZMs on advanced modulation formats is also discussed. Imbalance in the MZMs due to fabrication error can be compensated by using a dual-parallel MZM. ER can be higher than 70 dB.
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Ultra Wideband Frequency Chirp Millimetre-Wave Signal Generation Using Electro-Optic Modulation 査読あり
Tetsuya Kawanishi, Takahide Sakamoto, Atsushi Kanno
2011 13TH INTERNATIONAL CONFERENCE ON TRANSPARENT OPTICAL NETWORKS (ICTON) 2011年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
We describe ultra wideband frequency control of millimetre-wave and lightwave signals using optical single-sideband modulation. Precise and rapid frequency control can be achieved by digital arbitrary waveform generation and high-speed electro-optic modulation. Frequency multiplication in optical modulators also plays important roles. Ultra-wideband frequency chirp signals from 9.6 GHz to 16 GHz, which were generated by using a computer controlled arbitrary waveform generator and a wideband frequency multiplier, were fed to an optical single-sideband modulator consisting of two sub Mach-Zehnder interferometers.
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Photonic crystal fiber based ultra-broadband transmission system for waveband division multiplexing 査読あり
Yu Omigawa, Yuta Kinoshita, Naokatsu Yamamoto, Atsushi Kanno, Kouichi Akahane, Tetsuya Kawanishi, Hideyuki Sotobayashi
OPTICAL SENSORS 2011 AND PHOTONIC CRYSTAL FIBERS V 8073 2011年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：SPIE-INT SOC OPTICAL ENGINEERING
To open up new optical frequency resources available for optical communications, the concept of all-band photonics has been proposed, which is based on the utilization of broadband of optical frequencies from 1- to 2-mu m waveband as a novel photonic band for photonic transmission. In this study, an ultra-broadband photonic transport system was developed by employing a long-distance holey-fiber transmission line to simultaneously use the new 1-mu m waveband (T-band) and a conventional waveband. We successfully demonstrate the use of a photonic transport system to achieve simultaneous 3x10-Gbps error-free optical data transmissions for waveband division multiplexing of the 1-mu m waveband, C-band, and L-band.
DOI： 10.1117/12.886609
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Ultrafast and broadband frequency chirp signal generation using a high-extinction-ratio optical modulator 査読あり
Atsushi Kanno, Shinnosuke Honda, Ryuta Yamanaka, Hideyuki Sotobayashi, Tetsuya Kawanishi
OPTICS LETTERS 35 ( 24 ) 4160 - 4162 2010年12月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：OPTICAL SOC AMER
We successfully demonstrate ultrafast frequency sweep signal generation using the double-sideband suppressed carrier modulation technique with a high-extinction-ratio optical modulator that helps realize clear signals with no filters. The resultant sweep rate was achieved at 3.67 x 10(16) Hz/s with an extinction ratio above 25 dB, which corresponds to a bandwidth of 11 GHz with a pulse duration of 300 ns. (C) 2010 Optical Society of America
DOI： 10.1364/OL.35.004160
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Ultrafast and broadband frequency chirp signal generation using a high-extinction-ratio optical modulator 査読あり
Atsushi Kanno, Shinnosuke Honda, Ryuta Yamanaka, Hideyuki Sotobayashi, Tetsuya Kawanishi
OPTICS LETTERS 35 ( 24 ) 4160 - 4162 2010年12月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：OPTICAL SOC AMER
We successfully demonstrate ultrafast frequency sweep signal generation using the double-sideband suppressed carrier modulation technique with a high-extinction-ratio optical modulator that helps realize clear signals with no filters. The resultant sweep rate was achieved at 3.67 x 10(16) Hz/s with an extinction ratio above 25 dB, which corresponds to a bandwidth of 11 GHz with a pulse duration of 300 ns. (C) 2010 Optical Society of America
DOI： 10.1364/OL.35.004160
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Live Electrooptic Imaging of W-Band Waves 査読あり
Masahiro Tsuchiya, Kiyotaka Sasagawa, Atsushi Kanno, Takahiro Shiozawa
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES 58 ( 11 ) 3011 - 3021 2010年11月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
A novel method for real-time visual observation of traveling W-band waves is described. Wave images and movies are acquired by a live electrooptic imaging (LEI) camera equipped with an optical source that emits signals modulated at a local oscillator (LO) frequency in the W-band range. Waves propagating in a slab waveguide made of a semiconductor plate as well as in the air are successfully visualized. Especially in this paper, W-band wave images for the aerial propagation in a variety of forms are presented: spherical and plane waves together with some fundamental wave phenomena such as reflection, interference, and diffraction at metal-air interfaces. The principle of 100-GHz optical LO signal generation at the optical wavelength of 780 nm as well as performance parameters such as the spatial resolution, bandwidth, and dynamic range of the camera are discussed. Further, some preliminary applications of the scheme are presented.
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120-Gb/s NRZ-DQPSK signal generation by a thin-lithium-niobate- substrate modulator 査読あり
Atsushi Kanno, Takahide Sakamoto, Akito Chiba, Tetsuya Kawanishi, Kaoru Higuma, Masaaki Sudou, Junichiro Ichikawa
IEICE ELECTRONICS EXPRESS 7 ( 11 ) 817 - 822 2010年06月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG
A high-speed DQPSK optical modulator is fabricated with a thin lithium niobate substrate. Decrease in the propagation loss of electrodes and a low half-wave voltage, which can be realized by fabrication of a ridge-type optical waveguide structure, can help achieve 120-Gb/s (60-Gbaud) NRZ-DQPSK modulation with full electrical-time-division-multiplexing technique.
DOI： 10.1587/elex.7.817
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Real-time visualization of electromagnetic waves propagating in air using live electro-optic imaging technique 査読あり
Atsushi Kanno, Kiyotaka Sasagawa, Takahiro Shiozawa, Masahiro Tsuchiya
OPTICS EXPRESS 18 ( 10 ) 10029 - 10035 2010年05月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：OPTICAL SOC AMER
Electromagnetic waves propagating in air are visually observed with phase evolution in real time by live electro-optic imaging technique. We show how geometrical and crystallographic arrangements of an electro-optic sensor plate enable the realization of the real-time visual observation of traveling 100-GHz electromagnetic waves. For this purpose, a generation technique for a 100-GHz optical local oscillator signal at 780 nm was newly developed, whose optical wavelength is suitable for the ultra-parallel RF electric field data acquisition by a Si-CMOS image sensor. (C)2010 Optical Society of America
DOI： 10.1364/OE.18.010029
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Real-time visualization of electromagnetic waves propagating in air using live electro-optic imaging technique 査読あり
Atsushi Kanno, Kiyotaka Sasagawa, Takahiro Shiozawa, Masahiro Tsuchiya
OPTICS EXPRESS 18 ( 10 ) 10029 - 10035 2010年05月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：OPTICAL SOC AMER
Electromagnetic waves propagating in air are visually observed with phase evolution in real time by live electro-optic imaging technique. We show how geometrical and crystallographic arrangements of an electro-optic sensor plate enable the realization of the real-time visual observation of traveling 100-GHz electromagnetic waves. For this purpose, a generation technique for a 100-GHz optical local oscillator signal at 780 nm was newly developed, whose optical wavelength is suitable for the ultra-parallel RF electric field data acquisition by a Si-CMOS image sensor. (C)2010 Optical Society of America
DOI： 10.1364/OE.18.010029
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Digital Optical Costas Loop for Coherent Demodulation of 10-Gb/s BPSK 査読あり
Takahide Sakamoto, Akito Chiba, Atsushi Kanno, Tetsuya Kawanishi
2010 15TH OPTOELECTRONICS AND COMMUNICATIONS CONFERENCE (OECC) 766 - 767 2010年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEICE-INST ELECTRONICS INFORMATION & COMMUNICATION ENGINEERS
We demonstrate a digital optical Costas loop for real-time demodulation of a high-speed BPSK signal. The optical carrier is recovered by a DSP with high-bandwidth sampling at the frontend. A 10-Gb/s BPSK signal is demodulated.
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95-Gb/s NRZ-DPSK Modulation with Full-ETDM Technique 査読あり
Atsushi Kanno, Takahide Sakamoto, Akito Chiba, Tetsuya Kawanishi, Masaaki Sudo, Kaoru Higuma, Junichiro Ichikawa
2010 36TH EUROPEAN CONFERENCE AND EXHIBITION ON OPTICAL COMMUNICATION (ECOC), VOLS 1 AND 2 2010 ( 1 ) Mo.2.F.5, pp.1-2 2010年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
We demonstrated 95-Gb/s NRZ-DPSK modulation by using high-speed modulator and full-ETDM technique. The BER performance under a back-to-back condition is achieved to be 7.1 x 10 (4) at 95 Gb/s.
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40Gb/s DP- NRZ-QPSK Signal Generation using a Dual-Polarization Quad-Parallel Mach-Zehnder Modulator 査読あり
Masaaki Sudo, Takahide Sakamoto, Isao Morohashi, Atsushi Kanno, Akito Chiba, Tetsuya Kawanishi, Junichiro Ichikawa
2010 15TH OPTOELECTRONICS AND COMMUNICATIONS CONFERENCE (OECC) 456 - + 2010年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEICE-INST ELECTRONICS INFORMATION & COMMUNICATION ENGINEERS
We demonstrated a 40Gb/s DP-NRZ-QPSK signal generation using a dual-polarization quad-parallel MZ modulator fabricated on LiNbO3. Two orthogonally polarized QPSK signals were successfully demodulated by digital homodyne receiver.
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360-Gb/s NRZ-DP-DQPSK modulation with full-ETDM technique 査読あり
Atsushi Kanno, Takahide Sakamoto, Akito Chiba, Tetsuya Kawanishi, Masaaki Sudou, Kaoru Higuma, Junichiro Ichikawa
2010 15TH OPTOELECTRONICS AND COMMUNICATIONS CONFERENCE (OECC) 454 - + 2010年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEICE-INST ELECTRONICS INFORMATION & COMMUNICATION ENGINEERS
360-Gb/s (90-Gbaud) NRZ-DP-DQPSK modulation with full-ETDM technique is demonstrated by using a high-speed LiNbO3 optical modulator. The modulator with a ridge-type optical waveguide structure on a thin substrate helps realize high symbol-rate modulation.
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166 Gb/s PDM-NRZ-DPSK modulation using thin-LiNbO3-substrate modulator 査読あり
Atsushi Kanno, Takahide Sakamoto, Akito Chiba, Tetsuya Kawanishi, Kaoru Higuma, Masaaki Sudo, Junichiro Ichikawa
2010 CONFERENCE ON OPTICAL FIBER COMMUNICATION OFC COLLOCATED NATIONAL FIBER OPTIC ENGINEERS CONFERENCE OFC-NFOEC 2010 ( 1 ) 1 - 3 2010年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
The modulation of a 166-Gb/s PDM-NRZ-DPSK signal is demonstrated using a thin-LiNbO3-substrate modulator. The use of a 0.1-mm-thick substrate and a ridge-type waveguide improves the optical response and brings about a reduction in V pi. (C) 2009 Optical Society of America
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160-Gb/s NRZ-DQPSK signal generation using a thin-LiNbO3-substrate modulator with a ridge-type optical waveguide structure 査読あり
Atsushi Kanno, Takahide Sakamoto, Akito Chiba, Tetsuya Kawanishi, Kaoru Higuma, Masaaki Sudo, Junichiro Ichikawa
2010 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO) AND QUANTUM ELECTRONICS AND LASER SCIENCE CONFERENCE (QELS) 2010年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
160-Gb/s NRZ-DQPSK modulation is demonstrated with a thin-LiNbO3-substrate modulator. Using this substrate with a ridge-type waveguide structure can help realize an extension of a bandwidth and a decrease of a half-wave voltage of the modulator. (C) 2009 Optical Society of America
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16 Quadrature Amplitude Modulation Using Polarization-Multiplexing QPSK Modulator 査読あり
Isao Morohashi, Masaaki Sudo, Takahide Sakamoto, Atsushi Kanno, Akito Chiba, Junichiro Ichikawa, Tetsuya Kawanishi, Iwao Hosako
2010 15TH OPTOELECTRONICS AND COMMUNICATIONS CONFERENCE (OECC) 446 - + 2010年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEICE-INST ELECTRONICS INFORMATION & COMMUNICATION ENGINEERS
We demonstrated 16 QAM using a quad-parallel Mach-Zehnder modulator with polarization-multiplexing. This modulator generates two QPSK signals with orthogonal polarization. 16 QAM is synthesized from the QPSK signals by using a polarizer.
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16 QAM Synthesis by Angular Superposition of Polarization using Dual-Polarization QPSK Modulator 査読あり
Isao Morohashi, Masaaki Sudo, Takahide Sakamoto, Atsushi Kanno, Akito Chiba, Junichiro Ichikawa, Tetsuya Kawanishi
2010 36TH EUROPEAN CONFERENCE AND EXHIBITION ON OPTICAL COMMUNICATION (ECOC), VOLS 1 AND 2 2010 ( 1 ) P3.14, pp. 1-2 2010年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
We propose a polarization-multiplexing QPSK modulator for 16 QAM generation. 16 QAM is synthesized from two QPSK signals with orthogonal polarization by a polarizer. Generation of 40 Gb/s 16 QAM with the BER of 8.13x10(-6) was demonstrated.
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12.8-GHz-bandwidth frequency chirp signal generation with high-extinction-ratio optical modulator by optical frequency doubling technique 査読あり
Atsushi Kanno, Tetsuya Kawanishi, Shinnosuke Honda, Hideyuki Sotobayashi
Proceedings - 2010 IEEE International Topical Meeting on Microwave Photonics, MWP 2010 283 - 285 2010年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
We successfully demonstrated ultra-wideband frequency chirp signal generation using the DSB-SC modulation technique with pulse duration of 0.5 μs. A high extinction ratio optical modulator helps realize clear signals with no filters. ©2010 IEEE.
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Real-Time Homodyne Reception of 40-Gb/s BPSK Signal by Digital Optical Phase-Locked Loop 査読あり
Takahide Sakamoto, Akito Chiba, Atsushi Kanno, Isao Morohashi, Tetsuya Kawanishi
2010 36TH EUROPEAN CONFERENCE AND EXHIBITION ON OPTICAL COMMUNICATION (ECOC), VOLS 1 AND 2 2010 ( 1 ) P3.12, pp. 1-2 2010年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
We demonstrate real-time homodyne demodulation of a 40-Gb/s BPSK signal by using novel digital optical phase-locked loop with a Costas-loop structure. The optical carrier is locally recovered in the receiver side with a slow-speed digital signal processor employing bandwidth-enhanced samplers.
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Spurious free frequency doubler using a dual-parallel optical Mach-Zehnder modulator 査読あり
Tetsuya Kawanishi, Keizo Inagaki, Atsushi Kanno, Hitoshi Kiuchi
2010 23RD ANNUAL MEETING OF THE IEEE PHOTONICS SOCIETY 191 - + 2010年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
We propose a novel photonic-based signal generation technique using a dual parallel Mach-Zehnder modulator. Frequency doubled components without spurious can be generated at a photodetector. This technique is useful for measurement of photodetector nonlinearity.
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Image Observations and Analyses of RF Wave Propagations on the Basis of LEI Camera 査読あり
T. Shiozawa, A. Kanno, K. Sasagawa, M. Tsuchiya
PIERS 2010 XI'AN: PROGRESS IN ELECTROMAGNETICS RESEARCH SYMPOSIUM PROCEEDINGS, VOLS 1 AND 2 769 - + 2010年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：ELECTROMAGNETICS ACAD
We overview the recent progress of the novel experimental imaging scheme to intuitively analyze RF signal wave propagations. The scheme is based on a live-electrooptic-imaging camera (LEI camera; http://lei-camera.nict.go.jp/), which was invented and originally prototyped by NICT, and it involves the real-time visualization of phase evolution in RF wave electric fields. The scheme was demonstrated to be effective for determining the immediate essence of RF wave propagations.
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Spurious free frequency doubler using a dual-parallel optical Mach-Zehnder modulator 査読あり
Tetsuya Kawanishi, Keizo Inagaki, Atsushi Kanno, Hitoshi Kiuchi
2010 23RD ANNUAL MEETING OF THE IEEE PHOTONICS SOCIETY 191 - + 2010年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
We propose a novel photonic-based signal generation technique using a dual parallel Mach-Zehnder modulator. Frequency doubled components without spurious can be generated at a photodetector. This technique is useful for measurement of photodetector nonlinearity.
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Real-Time Homodyne Reception of 40-Gb/s BPSK Signal by Digital Optical Phase-Locked Loop 査読あり
Takahide Sakamoto, Akito Chiba, Atsushi Kanno, Isao Morohashi, Tetsuya Kawanishi
2010 36TH EUROPEAN CONFERENCE AND EXHIBITION ON OPTICAL COMMUNICATION (ECOC), VOLS 1 AND 2 2010 ( 1 ) P3.12, pp. 1-2 2010年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
We demonstrate real-time homodyne demodulation of a 40-Gb/s BPSK signal by using novel digital optical phase-locked loop with a Costas-loop structure. The optical carrier is locally recovered in the receiver side with a slow-speed digital signal processor employing bandwidth-enhanced samplers.
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Image and/or Movie Analyses of 100-GHz Traveling Waves on the Basis of Real-Time Observation With a Live Electrooptic Imaging Camera
Masahiro Tsuchiya, Atsushi Kanno, Kiyotaka Sasagawa, Takahiro Shiozawa
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES 57 ( 12 ) 3373 - 3379 2009年12月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
A 100-GHz-class live electrooptic imaging camera (LEI-camera), a novel microwave and millimeter-wave instrument, has been implemented for a scheme of W-band wave analyses. The first real-time visualization of W-band waves as phase-resolved images and phase-evolving movies has been successfully demonstrated, and the relevant images and/or movies obtained have been applied to the analyses of 100-GHz traveling waves. In conjunction with complementary numerical simulation approaches, studies have been conducted on a mode interaction between a ZnTe slab waveguide and a free space as well as on the loss tangent effect on W-band wave propagations. On the basis of the observed images and/or movies with live electrooptic imaging camera, some interesting analytical results have been obtained.
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Real-time digital signal processing for live electro-optic imaging 査読あり
Kiyotaka Sasagawa, Atsushi Kanno, Masahiro Tsuchiya
OPTICS EXPRESS 17 ( 18 ) 15641 - 15651 2009年08月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：OPTICAL SOC AMER
We present an imaging system that enables real-time magnitude and phase detection of modulated signals and its application to a Live Electro-optic Imaging (LEI) system, which realizes instantaneous visualization of RF electric fields. The real-time acquisition of magnitude and phase images of a modulated optical signal at 5 kHz is demonstrated by imaging with a Si-based high-speed CMOS image sensor and real-time signal processing with a digital signal processor. In the LEI system, RF electric fields are probed with light via an electro-optic crystal plate and downconverted to an intermediate frequency by parallel optical heterodyning, which can be detected with the image sensor. The artifacts caused by the optics and the image sensor characteristics are corrected by image processing. As examples, we demonstrate real-time visualization of electric fields from RF circuits. (C) 2009 Optical Society of America
DOI： 10.1364/OE.17.015641
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Real-time digital signal processing for live electro-optic imaging 査読あり
Kiyotaka Sasagawa, Atsushi Kanno, Masahiro Tsuchiya
OPTICS EXPRESS 17 ( 18 ) 15641 - 15651 2009年08月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：OPTICAL SOC AMER
We present an imaging system that enables real-time magnitude and phase detection of modulated signals and its application to a Live Electro-optic Imaging (LEI) system, which realizes instantaneous visualization of RF electric fields. The real-time acquisition of magnitude and phase images of a modulated optical signal at 5 kHz is demonstrated by imaging with a Si-based high-speed CMOS image sensor and real-time signal processing with a digital signal processor. In the LEI system, RF electric fields are probed with light via an electro-optic crystal plate and downconverted to an intermediate frequency by parallel optical heterodyning, which can be detected with the image sensor. The artifacts caused by the optics and the image sensor characteristics are corrected by image processing. As examples, we demonstrate real-time visualization of electric fields from RF circuits. (C) 2009 Optical Society of America
DOI： 10.1364/OE.17.015641
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High-speed DBPSK signal generation by low-Vπ modulator using thin LiNbO3 substrate 査読あり
A. Kanno, T. Sakamoto, A. Chiba, T. Kawanishi, K. Higuma, M. Sudou, J. Ichikawa
Proc. ECOC2009 2009 ( 1 ) P2.09, pp.1-2 2009年
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Real-time Visualization of W-band Millimeter Wave by Live Electro-optic Imaging 査読あり
Kiyotaka Sasagawa, Atsushi Kanno, Masahiro Tsuchiya
PIERS 2009 BEIJING: PROGESS IN ELECTROMAGNETICS RESEARCH SYMPOSIUM, PROCEEDINGS I AND II 48 - 51 2009年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：ELECTROMAGNETICS ACAD
In this paper, W-band millimeter wave imaging is demonstrated by a live electric imaging (LEI) system, which has been recently developed. The LEI enables a real-time imaging of RF electric fields with 100 x 100 pixels and the frame rate of 30 frames/sec. LEI is based on ultra-parallel photonic heterodyning. To visualize millimeter wave electric field, a W-band photonic signal at a wavelength of 775 nm as a local oscillator is generated by frequency doubling of modulated light at 1550 nm. As an example, W-band LEI observation results for electric near-fields over the end of a waveguide are presented.
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Optical Kerr response to multi pump pulses on GaAs weakly confined exciton
Atsushi Kanno, Redouane Katouf, Osamu Kojima, Junko Ishi-Hayase, Masahiro Tsuchiya, Toshiro Isu
PHYSICA STATUS SOLIDI C: CURRENT TOPICS IN SOLID STATE PHYSICS, VOL 6, NO 6 6 ( 6 ) 1509 - 1512 2009年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：WILEY-V C H VERLAG GMBH
We investigate optical Kerr response under two-pump pulse irradiation induced by GaAs weakly confined exciton. Ultrafast response times of the order of picoseconds are observed despite long exciton lifetime of the order of nanoseconds. The difference may be attributed to the relaxation mechanisms between population relaxation and nonlinear relaxation of excitons. In addition, the observed temporal shapes of the optical Kerr response are conserved under irradiation by a preceding pulse that forms the exciton population. The pulse separation of the optical Kerr response between two pump pulses is achieved to be 800 fs, which corresponds to a signal train of 1.25 Tbits per second. (C) 2009 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
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Real-time Visualization of W-band Millimeter Wave by Live Electro-optic Imaging 査読あり
Kiyotaka Sasagawa, Atsushi Kanno, Masahiro Tsuchiya
PIERS 2009 BEIJING: PROGESS IN ELECTROMAGNETICS RESEARCH SYMPOSIUM, PROCEEDINGS I AND II 48 - 51 2009年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：ELECTROMAGNETICS ACAD
In this paper, W-band millimeter wave imaging is demonstrated by a live electric imaging (LEI) system, which has been recently developed. The LEI enables a real-time imaging of RF electric fields with 100 x 100 pixels and the frame rate of 30 frames/sec. LEI is based on ultra-parallel photonic heterodyning. To visualize millimeter wave electric field, a W-band photonic signal at a wavelength of 775 nm as a local oscillator is generated by frequency doubling of modulated light at 1550 nm. As an example, W-band LEI observation results for electric near-fields over the end of a waveguide are presented.
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Phase-Evolving Real-Time Visualization of 100 GHz Traveling Waves 査読あり
Masahiro Tsuchiya, Atsushi Kanno, Kiyotaka Sasagawa, Takahiro Shiozawa
2009 IEEE/MTT-S INTERNATIONAL MICROWAVE SYMPOSIUM, VOLS 1-3 1673 - + 2009年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
A novel experimental scheme has been demonstrated for wave analyses in W-band. A system for phase-evolving real-time visualization of W-band waves has been constructed for the first time and has been applied to 100 GHz traveling wave analyses. Analyses on wave images/movies have been performed in conjunction with a numerical simulation approach. Described as an example of the wave analyses is a study on wave interactions between a semiconductor slab waveguide mode and a free space mode.
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Ultrahigh Relative Refractive Index Contrast GaAs Nanowire Waveguides
Redouane Katouf, Naokatsu Yamamoto, Atsushi Kanno, Norihiko Sekine, Kouichi Akahane, Hideyuki Sotobayashi, Toshiro Isu, Masahiro Tsuchiya
APPLIED PHYSICS EXPRESS 1 ( 12 ) 122101-1-4 2008年12月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：JAPAN SOCIETY APPLIED PHYSICS
An effective and practical fabrication procedure toward compound semiconductor nanowire waveguide on insulator is developed. GaAs nanowire waveguides with a cross-section of 400 x 400 nm(2), bend radius of 10 mu m, and a high relative refractive index contrast, Delta, of 40% were successfully fabricated for the first time. The propagation loss at 1.55 mu m was measured to be approximately 4.5dB/mm, and the bend loss was less than 0.8dB per 90 degrees bend. The losses were considered to be dominated by light scattering at the rough sidewalls. (C) 2008 The Japan Society of Applied Physics
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Ultrahigh Relative Refractive Index Contrast GaAs Nanowire Waveguides
Redouane Katouf, Naokatsu Yamamoto, Atsushi Kanno, Norihiko Sekine, Kouichi Akahane, Hideyuki Sotobayashi, Toshiro Isu, Masahiro Tsuchiya
APPLIED PHYSICS EXPRESS 1 ( 12 ) 122101-1-4 2008年12月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：JAPAN SOCIETY APPLIED PHYSICS
An effective and practical fabrication procedure toward compound semiconductor nanowire waveguide on insulator is developed. GaAs nanowire waveguides with a cross-section of 400 x 400 nm(2), bend radius of 10 mu m, and a high relative refractive index contrast, Delta, of 40% were successfully fabricated for the first time. The propagation loss at 1.55 mu m was measured to be approximately 4.5dB/mm, and the bend loss was less than 0.8dB per 90 degrees bend. The losses were considered to be dominated by light scattering at the rough sidewalls. (C) 2008 The Japan Society of Applied Physics
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Instantaneous Visualization of K-Band Electric Near-Fields by a Live Electrooptic Imaging System Based on Double Sideband Suppressed Carrier Modulation
Kiyotaka Sasagawa, Atsushi Kanno, Masahiro Tsuchiya
JOURNAL OF LIGHTWAVE TECHNOLOGY 26 ( 13-16 ) 2782 - 2788 2008年07月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
This paper discusses instantaneous electric near-field imaging in the K-band. The imaging technique is based on the live electrooptic imaging (LEI) scheme, which was originally developed for electric near-field imaging in the microwave range. The measurement frequency of the LEI system is extended by using the second-order harmonic component of modulated light as a photonic local oscillator signal. We demonstrated electric near-field imaging over rather ordinary components such as an SMA connector and a microstrip transmission line at frequencies up to 25 GHz.
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Decay of orientational grating of weakly confined excitons in GaAs thin films
O. Kojima, T. Isu, J. Ishi-Hayase, A. Kanno, R. Katouf, M. Sasaki, M. Tsuchiya
JOURNAL OF LUMINESCENCE 128 ( 5-6 ) 963 - 965 2008年05月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：ELSEVIER SCIENCE BV
We report the dynamical properties of the exciton orientation in GaAs thin films using the orientational grating (OG) technique. From the results of excitation-power dependence of OG signal, we confirmed that the OG signal comes from the optical nonlinearity of weakly confined excitons. In addition, the OG-decay time decreases with an increase of excitation power due to exciton-exciton interaction, and the shortest decay time is below 1ps. Our results may imply the potential application of optical nonlinearity of weakly confined exciton to ultrafast switching devices operating at 1 Tbit/s. (C) 2007 Elsevier B.V. All rights reserved.
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Effects of excitation spectral width on decay profile of weakly confined excitons
O. Kojima, T. Isu, J. Ishi-Hayase, A. Kanno, R. Katouf, M. Sasaki, M. Tsuchiya
JOURNAL OF LUMINESCENCE 128 ( 5-6 ) 966 - 968 2008年05月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：ELSEVIER SCIENCE BV
We report the effect due to a simultaneous excitation of several exciton states on the radiative decay profiles on the basis of the nonlocal response of weakly confined excitons in GaAs thin films. In the case of excitation of single exciton state, the transient grating signal has two decay components. The fast decay component comes from nonlocal response, and the long-lived component is attributed to free exciton decay. With an increase of excitation spectral width, the nonlocal component becomes small in comparison with the long-lived component, and disappears under irradiation of a femtosecond-pulse laser with broader spectral width. The transient grating spectra clearly indicates the contribution of the weakly confined excitons to the signal, and the exciton line width hardly changes by excitation spectral width. From these results, we concluded that the change of decay profile is attributed not to the many-body effect but to the effect of simultaneous excitation of several exciton states. (C) 2007 Elsevier B.V. All rights reserved.
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Photoluminescence dynamics of weakly confined excitons in GaAs thin films
Atsushi Kanno, Redouane Katouf, Osamu Kojima, Junko Ishi-Hayase, Masahide Sasaki, Masahiro Tsuchiya, Toshiro Isu
JOURNAL OF LUMINESCENCE 128 ( 5-6 ) 1069 - 1071 2008年05月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：ELSEVIER SCIENCE BV
We investigate the dynamics of weakly confined excitons in GaAs thin films measured by time-resolved photoluminescence (PL) technique. When excitation energy was above the resonant energy of the exciton, a long PL rise time of about 200 ps was observed. It is considered that an exciton formation process from excited continuum energy states to discrete energy states of the exciton in the thin film causes the slow PL rise. The observed PL decay time constant was about 14 ns due to high quality fabricated samples. The observed population dynamics can be surely ascribed to the specific features of weakly confined excitons. (C) 2007 Elsevier B.V. All rights reserved.
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Ultrafast response induced by interference effects between weakly confined exciton states
Osamu Kojima, Toshiro Isu, Junko Ishi-Hayase, Atsushi Kanno, Redouane Katouf, Masahide Sasaki, Masahiro Tsuchiya
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 77 ( 4 ) "044701 - 1"-"044701-4" 2008年04月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：PHYSICAL SOC JAPAN
We report an ultrafast response of weakly confined excitons in GaAs thin films observed by a degenerate four-wave-mixing (DFWM) technique. The time-domain signals excited by broadband pulses show an oscillatory structure with a period that varies according to the pulse spectral width and an ultrafast response comparable to the pulse width; on the other hand, the exciton dephasing time is hardly changed by the excitation spectral width. This ultrafast response is much faster than the radiative lifetime expected on the basis of the nonlocal response theory. The DFWM spectra measured at various time delays clearly indicate the contribution of weakly confined excitons to the ultrafast response. Moreover, in the measurement of excitation-energy dependence, the time-domain signals excited by a controlled spectral width exhibit the variation of the oscillation period and response time. These characteristics are similar to those of the excitation spectral width dependence. From the analysis of oscillatory structures, it is found that the oscillation originates from the interference between weakly confined exciton states. Therefore, we conclude that the overlap of the oscillation due to the interference with the DFWM signal leads to the ultrafast response without any change in the exciton dephasing time. These results imply that the control of the excitation spectral width induces the ultrafast nonlinear optical response of the weakly confined excitons.
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Ultrafast response induced by interference effects between weakly confined exciton states
Osamu Kojima, Toshiro Isu, Junko Ishi-Hayase, Atsushi Kanno, Redouane Katouf, Masahide Sasaki, Masahiro Tsuchiya
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 77 ( 4 ) "044701 - 1"-"044701-4" 2008年04月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：PHYSICAL SOC JAPAN
We report an ultrafast response of weakly confined excitons in GaAs thin films observed by a degenerate four-wave-mixing (DFWM) technique. The time-domain signals excited by broadband pulses show an oscillatory structure with a period that varies according to the pulse spectral width and an ultrafast response comparable to the pulse width; on the other hand, the exciton dephasing time is hardly changed by the excitation spectral width. This ultrafast response is much faster than the radiative lifetime expected on the basis of the nonlocal response theory. The DFWM spectra measured at various time delays clearly indicate the contribution of weakly confined excitons to the ultrafast response. Moreover, in the measurement of excitation-energy dependence, the time-domain signals excited by a controlled spectral width exhibit the variation of the oscillation period and response time. These characteristics are similar to those of the excitation spectral width dependence. From the analysis of oscillatory structures, it is found that the oscillation originates from the interference between weakly confined exciton states. Therefore, we conclude that the overlap of the oscillation due to the interference with the DFWM signal leads to the ultrafast response without any change in the exciton dephasing time. These results imply that the control of the excitation spectral width induces the ultrafast nonlinear optical response of the weakly confined excitons.
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W-band photonic signal generation with carrier and unnecessary sidebands suppressed by second harmonic generation 査読あり
Kiyotaka Sasagawa, Atsushi Kanno, Masahiro Tsuchiya
Conference Proceedings - Lasers and Electro-Optics Society Annual Meeting-LEOS 348 - 349 2008年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
We demonstrate 100GHz (W-band) photonic signal generation at 775 nm by optical modulation and spectral shaping at 1.55 μm combined with second harmonic (SH) generation with a periodically poled lithium niobate waveguide. ©2008 IEEE.
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15 dB cross loss modulation by cw pump injection of mW-class in 1.5-mm long nano-wire waveguide 査読あり
R. Katouf, A. Kanno, N. Yamamoto, N. Sekine, T. K. Liang, K. Sasagawa, K. Akahane, T. Isu, H. Sotobayashi, M. Tsuchiya
2008 CONFERENCE ON LASERS AND ELECTRO-OPTICS & QUANTUM ELECTRONICS AND LASER SCIENCE CONFERENCE, VOLS 1-9 1184 - 1185 2008年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
GaAs nano-wire waveguides were successfully fabricated on a SiO(2)/Si substrate for the first time. 15 dB; cross loss modulation was achieved by a few mW continuous-wave pump power within a 1.5 mm-long waveguide. (C)2008 Optical Society of America
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Spectral width dependence of residual carrier effect on nonlinear optical response of weakly confined excitons
O. Kojima, T. Isu, J. Ishi-Hayase, M. Sasaki, A. Kanno, R. Katouf, M. Tsuchiya
PHYSICA STATUS SOLIDI C - CURRENT TOPICS IN SOLID STATE PHYSICS, VOL 5, NO 9 5 ( 9 ) 2858 - 2860 2008年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：WILEY-V C H VERLAG GMBH
We report residual carrier effects on the nonlinear optical response of weakly confined excitons in GaAs thin films. The nonlinear response was investigated using a degenerate four-wave mixing technique with an additional pulse to create the residual carriers. In the case of the additional-pulse incidence, the signal intensity decreases with the time of incidence. However, the ultrafast component comparable to the pulse width in the temporal profiles does not change appreciably. Our results imply the possibility of the realization of ultrafast switching using the exciton response. (C) 2008 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
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Ultrafast optical Kerr effect of excitons weakly confined in GaAs thin films
Atsushi Kanno, Redouane Katouf, Osamu Kojima, Junko Ishi-Hayase, Masahiro Tsuchiya, Toshiro Isu
Physica Status Solidi (C) Current Topics in Solid State Physics 5 ( 1 ) 360 - 363 2008年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
We investigate ultrafast response of optical Kerr effect (OKE) induced by excitons weakly confined in GaAs thin films. The observed decay time of optical response agrees approximately with incident pulse duration. At 100-fs pulse irradiation the response time is estimated to be 170 fs, though the exciton lifetime is about 10 ns. It is considered that the ultrafast response of OKE is caused by not population relaxation but orientation relaxation of excitons. © 2008 WILEY-VCH Verlag GmbH &
Co. KGaA. -
V-band Signal Generation by Photonic Frequency Doubling with Periodically Poled Lithium Niobate Waveguide 査読あり
Kiyotaka Sasagawa, Atsushi Kanno, Masahiro Tsuchiya
2008 INTERNATIONAL TOPICAL MEETINGS ON MICROWAVE PHOTONICS AND 2008 ASIA-PACIFIC MICROWAVE PHOTONICS CONFERENCE 127 - 130 2008年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
In this paper, we propose and demonstrate a novel photonic signal generation method for V-band applications, where a two-tone photonic signal is provided with a combination of optical modulation and optical frequency doubling. Based on the method, a fundamental light at 1.55 mu m is modulated at a frequency of 30 GHz and the optical frequency is doubled with a periodically poled lithium niobate (PPLN) waveguide. The experimental result is in agreement with the calculation and a V-band two-tone signal at 775 nm with a frequency separation of 60 GHz is obtained.
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W-band live electro-optic imaging system 査読あり
Atsushi Kanno, Kiyotaka Sasagawa, Masahiro Tsuchiya
2008 EUROPEAN MICROWAVE CONFERENCE, VOLS 1-3 552 - + 2008年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
A real-time electro-optic imaging technique for W-band electric-field distribution has been successfully realized for the first time. On the basis of high-bandwidth photonics, the system provides instantaneous 100x100-pixels visualization of the W-band intensity and phase distribution along with phasor images. For a demonstration of the measurement performance, 100-GHz wave emission patterns from a WR-10 waveguide flange were visualized.
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Live electro-optic imaging (LEI) for real-time analyses of electric near-fields over microwave circuits 査読あり
Kiyotaka Sasagawa, Atsushi Kanno, Masahiro Tsuchiya
PIERS 2008 HANGZHOU: PROGRESS IN ELECTROMAGNETICS RESEARCH SYMPOSIUM, VOLS I AND II, PROCEEDINGS 414 - 417 2008年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：ELECTROMAGNETICS ACAD
Live electro-optic imaging (LEI) system is described in this paper, which enables the real-time imaging functionality of electrical signals on up to 10 GHz-class circuits in realtime on a screen at video frame rates as high as 30 frames per second. In the system, photonics provides important features of the system: its 100 x 100-channel parallel detection and the low invasiveness of electrooptic crystal. With the LEI system, novel diagnostic methods are provided through instantaneous and intuitive analyses of RF signal. distribution changes. As an example, LEI observation results for a coplanar waveguide with a moving metal plate axe presented.
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W-band photonic signal generation with carrier and unnecessary sidebands suppressed by second harmonic generation 査読あり
Kiyotaka Sasagawa, Atsushi Kanno, Masahiro Tsuchiya
Conference Proceedings - Lasers and Electro-Optics Society Annual Meeting-LEOS 348 - 349 2008年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
We demonstrate 100GHz (W-band) photonic signal generation at 775 nm by optical modulation and spectral shaping at 1.55 μm combined with second harmonic (SH) generation with a periodically poled lithium niobate waveguide. ©2008 IEEE.
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W-band live electro-optic imaging system 査読あり
Atsushi Kanno, Kiyotaka Sasagawa, Masahiro Tsuchiya
2008 EUROPEAN MICROWAVE CONFERENCE, VOLS 1-3 552 - + 2008年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
A real-time electro-optic imaging technique for W-band electric-field distribution has been successfully realized for the first time. On the basis of high-bandwidth photonics, the system provides instantaneous 100x100-pixels visualization of the W-band intensity and phase distribution along with phasor images. For a demonstration of the measurement performance, 100-GHz wave emission patterns from a WR-10 waveguide flange were visualized.
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V-band Signal Generation by Photonic Frequency Doubling with Periodically Poled Lithium Niobate Waveguide 査読あり
Kiyotaka Sasagawa, Atsushi Kanno, Masahiro Tsuchiya
2008 INTERNATIONAL TOPICAL MEETINGS ON MICROWAVE PHOTONICS AND 2008 ASIA-PACIFIC MICROWAVE PHOTONICS CONFERENCE 127 - 130 2008年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
In this paper, we propose and demonstrate a novel photonic signal generation method for V-band applications, where a two-tone photonic signal is provided with a combination of optical modulation and optical frequency doubling. Based on the method, a fundamental light at 1.55 mu m is modulated at a frequency of 30 GHz and the optical frequency is doubled with a periodically poled lithium niobate (PPLN) waveguide. The experimental result is in agreement with the calculation and a V-band two-tone signal at 775 nm with a frequency separation of 60 GHz is obtained.
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Ultrafast optical Kerr effect of excitons weakly confined in GaAs thin films
Atsushi Kanno, Redouane Katouf, Osamu Kojima, Junko Ishi-Hayase, Masahiro Tsuchiya, Toshiro Isu
Physica Status Solidi (C) Current Topics in Solid State Physics 5 ( 1 ) 360 - 363 2008年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
We investigate ultrafast response of optical Kerr effect (OKE) induced by excitons weakly confined in GaAs thin films. The observed decay time of optical response agrees approximately with incident pulse duration. At 100-fs pulse irradiation the response time is estimated to be 170 fs, though the exciton lifetime is about 10 ns. It is considered that the ultrafast response of OKE is caused by not population relaxation but orientation relaxation of excitons. © 2008 WILEY-VCH Verlag GmbH &
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Spectral width dependence of residual carrier effect on nonlinear optical response of weakly confined excitons
O. Kojima, T. Isu, J. Ishi-Hayase, M. Sasaki, A. Kanno, R. Katouf, M. Tsuchiya
PHYSICA STATUS SOLIDI C - CURRENT TOPICS IN SOLID STATE PHYSICS, VOL 5, NO 9 5 ( 9 ) 2858 - 2860 2008年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：WILEY-V C H VERLAG GMBH
We report residual carrier effects on the nonlinear optical response of weakly confined excitons in GaAs thin films. The nonlinear response was investigated using a degenerate four-wave mixing technique with an additional pulse to create the residual carriers. In the case of the additional-pulse incidence, the signal intensity decreases with the time of incidence. However, the ultrafast component comparable to the pulse width in the temporal profiles does not change appreciably. Our results imply the possibility of the realization of ultrafast switching using the exciton response. (C) 2008 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
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Phase-resolved visualization of 100 GHz traveling electromagnetic waves by an EO imaging method 査読あり
Atsushi Kanno, Kiyotaka Sasagawa, Masahiro Tsuchiya
Conference Proceedings - Lasers and Electro-Optics Society Annual Meeting-LEOS 218 - 219 2008年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
The first phase-resolved visualization of traveling electromagnetic waves using the live electrooptic imaging method is reported. Stroboscopic images of wave electric-field intensity and phase are achieved instantaneously. ©2008 IEEE.
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Multi-channel measurement of RF complex refractive index by live electrooptic imaging camera 査読あり
Atsushi Kanno, Kiyotaka Sasagawa, Masahiro Tsuchiya
2008 INTERNATIONAL TOPICAL MEETINGS ON MICROWAVE PHOTONICS AND 2008 ASIA-PACIFIC MICROWAVE PHOTONICS CONFERENCE 259 - 262 2008年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
The concept of multi-channel RF complex refractive index measurement using a live electrooptic imaging (LEI) camera is proposed. The complex refractive index of water has been successfully evaluated with the transmitted microwave intensity and phase information being acquired within 0.5 s in a parallel manner suggesting that the instantaneous observation functionality of the LEI camera could be beneficial for prompt diagnosis and analysis of time-varying samples. The obtained refractive indices coincide well with those reported in the literature.
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Live electrooptic imaging system based on ultraparallel photonic heterodyne for microwave near-fields
Kiyotaka Sasagawa, Atsushi Kanno, Tetsuya Kawanishi, Masahiro Tsuchiya
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES 55 ( 12 ) 2782 - 2791 2007年12月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
We report on 100 x 100 pixel live electrooptic imaging (LEI), which is real-time imaging of electrical signals on a microwave circuit. The circuit's electric near-fields can be depicted in real time on a display screen at video frame rates as high as 30 frames/s. This system is based on photonics technology in which electric near-fields are applied to an electrooptic crystal plate and a sensing light beam is modulated there. The frequency of modulation is down-converted by using a photonic heterodyne of large-scale parallelism, and the spatial pattern of the electroopitic modulation is detected with a high-speed image sensor. A digital signal processor is used to extract the frequency component of interest and to animate it on the display screen. As examples, we present live pictures of electric field pattern data acquired by the LEI system in a real-time manner.
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Instantaneous microwave transmission imaging of aqueous samples 査読あり
Atsushi Kanno, Kiyotaka Sasagawa, Masahiro Tsuchiya
2007 INTERNATIONAL TOPICAL MEETING ON MICROWAVE PHOTONICS 96 - 99 2007年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
We report on instantaneous microwave transmission imaging experiments using a photonic technique. A high-resolution electro-optic (EO) camera we developed was used as a microwave image sensor under near-field conditions. Microwave transmission images of water capsules could be depicted with 10,000 pixels in less than one second. The images using a combination of the observed microwave intensity and phase showed higher contrast. The spatial resolution was as fine as one tenth of the microwave wavelength. Our system is potentially applicable to microwave transmission imaging of aqueous objects and their diagnoses.
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Live electro-optic imaging of microwave near-fields via ultra-parallel photonic heterodyne 査読あり
Kiyotaka Sasagawa, Atsushi Kanno, Tetsuya Kawanishi, Masahiro Tsuchiya
2007 IEEE/MTT-S INTERNATIONAL MICROWAVE SYMPOSIUM DIGEST, VOLS 1-6 401 - 404 2007年
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：IEEE
We present the first demonstration of fine Live Electro optic Imaging (LEI) of electrical signals on a microwave circuit. Patterns of their electric-near-fields are lively depicted on a display screen with a rate as high as 20 frames per second. In this system, a sensing light beam is modulated by an electro-optic (EO) crystal plate with the electric near-fields applied, and its spatial pattern of EO modulation are detected by a two-dimensional photo-detector array, where the frequency of modulation is down-converted by photonic heterodyne of large-scale parallelism. A digital signal processor (DSP) is employed to extract the frequency component of interest and to make it animated on the display screen. As examples, we present motion pictures of electric field pattern data acquired by the system in a real-time manner.
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Highly sensitive time-resolved Kerr rotation measurements on single-layer quantum dots
A Kanno, Y Masumoto
JOURNAL OF LUMINESCENCE 119 178 - 182 2006年07月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：ELSEVIER SCIENCE BV
We construct the highly sensitive Kerr rotation system to observe electron spin precession in single-layer quantum dots. The system consists of a photoelastic, modulator, a balanced detector and tandem double lock-in amplifiers. The angle resolution achieves 5 x 10(-6) degree, and is highest among the reported so far. To evaluate the possibility of measuring spin relaxation in single-layer quantum dots, we studied the strain-induced GaAs quantum dots. We observe successfully the electron spin precession in the single-layer quantum dots under resonant excitation. (c) 2006 Elsevier B.V. All rights reserved.
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Spin relaxation mechanism of strain-induced GaAs quantum dots studied by time-resolved Kerr rotation
Atsushi Kanno, Yasuaki Masumoto
Phys. Rev. B 73 ( 7 ) 073309 - 73309 2006年
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：American Physical Society
We observed electron spin precession under magnetic field in single-layer quantum dots (QDs) by highly sensitive time-resolved Kerr rotation measurement. The spin lifetime is longer than that for the quantum well (QW). This is a result of the additional spatial confinement of electrons in QDs. Below 60 K, the spin lifetime is almost constant, and is 7 times shorter than the carrier lifetime. This suggests that the strong electron-hole exchange interaction dominates over the electron spin lifetime in QDs at low temperature.
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Confined acoustic vibration modes in CuBr quantum dots
M Ikezawa, JL Zhao, A Kanno, Y Masumoto
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 74 ( 11 ) 3082 - 3087 2005年11月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：PHYSICAL SOC JAPAN
Confined acoustic phonons in CuBr quantum dots (QDs) are studied for the first time using coherent phonon measurements and persistent spectral hole burning (PSHB) spectroscopy. A size-dependent damped oscillation with sub-THz frequency is observed in femtosecond pump-probe measurements of CuBr QDs in glass. Similarly, a size-dependent acoustic phonon hole with an energy shift of 1-2 meV is observed in PSHB spectra of CuBr QDs in glass and NaBr crystals. The energies of the confined acoustic phonons obtained by the two methods are in good agreement with each other. In addition, there is no difference in size-dependence between the glass matrix and NaBr matrix. The size dependence of acoustic phonons can be explained well as low frequency vibrational modes of CuBr QDs based on an elastic sphere model. The dominant mode is assigned to the l = 2 spheroidal mode, while the l = 0 mode is also observed.
DOI： 10.1143/JPSJ.74.3082
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Longitudinal optical phonons in the excited state of CuBr quantum dots
J Zhao, A Kanno, M Ikezawa, Y Masumoto
PHYSICAL REVIEW B 68 ( 11 ) 113305-1-4 2003年09月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：AMER PHYSICAL SOC
The size dependence of the longitudinal optical (LO) phonons in the excited state of CuBr quantum dots (QD's) in glass and NaBr crystals in the intermediate confinement regime was studied by means of persistent spectral hole burning spectroscopy. The phonon-exciton coupled states were clearly observed at a photon energy of about 2.993 eV when the LO phonon energy is close to the energy difference between the ground 1S and excited 1P states of CuBr QD's in glass. The energies of the LO phonons observed in smaller CuBr QD's in glass and NaBr crystals were determined to be about 18.6 and 17.6 meV, respectively, which are smaller than that of LO phonons in the bulk CuBr material. The energy softening of the LO phonons was explained in terms of the phonon renormalization.
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Photoinduced electric dipole in CuCl quantum dots
Y Masumoto, F Naruse, A Kanno
JOURNAL OF LUMINESCENCE 102 629 - 634 2003年05月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：ELSEVIER SCIENCE BV
Electromodulated absorption spectra of CuCl quantum dots modulated at twice the modulation frequency of electric field, 2f, show prominent structure around persistently burned hole. It grows in proportion to square of the electric field in the same manner as the 2f component of electromodulated absorption spectra of the dots without the laser exposure. Even the 2f component of electromodulated signal was observed around the burned hole position. These observations are explained by considering electric dipole formed in hole burned and photoionized quantum dots. Photoionization not only produces persistent spectral hole burning but also the local built-in electric field and photoinduced dipole moment in quantum dots. The dipole moment is estimated to be about 5 debye for 3.2-nm-radius quantum dots. The dipole moments are randomly oriented but 1% anisotropy is deduced from the electromodulated signal at (C) 2003 Elsevier Science B.V. All rights reserved.
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Longitudinal optical phonons in the excited state of CuBr quantum dots 査読あり
Jialong Zhao, Atsushi Kanno, Michio Ikezawa, Yasuaki Masumoto
Physical Review B - Condensed Matter and Materials Physics 68 ( 11 ) 2003年
記述言語：英語 掲載種別：研究論文（学術雑誌）
The size dependence of the longitudinal optical (LO) phonons in the excited state of CuBr quantum dots (QD’s) in glass and NaBr crystals in the intermediate confinement regime was studied by means of persistent spectral hole burning spectroscopy. The phonon-exciton coupled states were clearly observed at a photon energy of about 2.993 eV when the LO phonon energy is close to the energy difference between the ground 1S and excited 1P states of CuBr QD’s in glass. The energies of the LO phonons observed in smaller CuBr QD’s in glass and NaBr crystals were determined to be about 18.6 and 17.6 meV, respectively, which are smaller than that of LO phonons in the bulk CuBr material. The energy softening of the LO phonons was explained in terms of the phonon renormalization. © 2003 The American Physical Society.
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