論文 - 菅野 敦史
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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.
