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ORCIDToshimasa Umezawa
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2020 – today
- 2024
[j3]Yaofeng Yi
, Toshimasa Umezawa, Kouichi Akahane, Tetsuya Kawanishi:
High-Responsivity Unitraveling Carrier-Type Photodetector Using Avalanche InAlAs as a Collector at a High-Frequency Range. IEEE Access 12: 22813-22820 (2024)- [j2]Yaofeng Yi, Toshimasa Umezawa, Kouichi Akahane, Tetsuya Kawanishi:
Thermal Study for High-Photocurrent Photodetector in Non-Saturation Region Using Thin Substrate, Thin Absorber, and Flip- Chip Bonding Process. IEEE Access 12: 56414-56421 (2024) - [c34]Atsushi Matsumoto, Ryota Yabuki, Shinya Nakajima, Toshimasa Umezawa, Siim Heinsalu, Yuichi Matsushima, Koichi Akahane, Naokatsu Yamamoto, Katsuyuki Utaka:
Low Threshold and 10kHz-Class Narrow Linewidth 1.55 µm-Band Quantum Dot Laser Diode on InP(311)B Substrate. OFC 2024: 1-3 - [c33]Toshimasa Umezawa, Pham Tien Dat, Yuki Yoshida, Shinya Nakajima, Atsushi Matsumoto, Kouichi Akahane, Atsushi Kanno, Naokatsu Yamamoto:
DC-226 GHz well-impedance-matched high-speed photoreceiver for multi-band signal detection. OFC 2024: 1-3 - [c32]Zu-Kai Weng, Yuki Yoshida, Toshimasa Umezawa, Abdelmoula Bekkali, Michikazu Hattori, Atsushi Matsumoto, Atsushi Kanno, Naokatsu Yamamoto, Tetsuya Kawanishi, Kouichi Akahane:
Demonstration of Robust Mobile Free Space Optical System using High-speed Beam Tracking and 2D-PDA-based Spatial-Diversity Reception. OFC 2024: 1-3 - [c31]Zu-Kai Weng, Yuki Yoshida, Toshimasa Umezawa, Abdelmoula Bekkali, Michikazu Hattori, Atsushi Matsumoto, Atsushi Kanno, Naokatsu Yamamoto, Tetsuya Kawanishi, Kouichi Akahane:
40-Gbit/s Mobile FSO with High-speed Beam Stabilizer and 2D-PDA-based Diversity Receiver for Support Robots. OFC 2024: 1-3 - 2023
- [c30]Go Soma, Yoshiro Nomoto, Toshimasa Umezawa, Yuki Yoshida, Yoshiaki Nakano, Takuo Tanemura:
Self-Coherent Transmission Using Metasurface-based Stokes-Vector Receiver. OFC 2023: 1-3 - [c29]Toshimasa Umezawa, Atsushi Matsumoto, Kouichi Akahane, Atsushi Kanno, Naokatsu Yamamoto:
100-Gbps 2-SDM 2-WDM FSO beam direct detection using resonant cavity 4x4 photodetector array. OFC 2023: 1-3 - 2022
- [c28]Toshimasa Umezawa, Atsushi Matsumoto, Kouichi Akahane, Atsushi Kanno, Naokatsu Yamamoto:
400-pixel high-speed photodetector for high optical alignment robustness FSO receiver. OFC 2022: 1-3 - [c27]Siyang Duan, Toshimasa Umezawa, Atsushi Kanno, Tetsuya Kawanishi:
High-Efficient Pixel Layout Arrangement in High-Speed 2-D Photodetector Array. OECC/PSC 2022: 1-3 - [c26]Hayato Takemura, Haruto Shinya, Yuya Yamaguchi, Toshimasa Umezawa, Atsushi Kanno, Tetsuya Kawanishi:
High-Speed Beam Steering LN Optical Phased Array Module using Comb-Electrode. OECC/PSC 2022: 1-3 - [c25]Yaofeng Yi, Toshimasa Umezawa, Atsushi Kanno, Tetsuya Kawanishi:
50 GHz High Photocurrent PIN-PD and Its Thermal Effect. OECC/PSC 2022: 1-3 - 2021
- [c24]Toshimasa Umezawa, Shinya Nakajima, Atsushi Kanno, Naokatsu Yamamoto:
Submillimeter Large High-speed Photodetector for High Optical Alignment Robustness Optical Wireless Communications. ECOC 2021: 1-4 - [c23]Toshimasa Umezawa, Kunio Jitsuno, Naokatsu Yamamoto, Tetsuya Kawanishi:
240-Gbps SDM-FSO communication using 4-bundle fiber and 2D photodetector array. OFC 2021: 1-3 - 2020
- [c22]Toshimasa Umezawa, Pham Tien Dat, Atsushi Kanno, Kunihisa Jitsuno, Naokatsu Yamamoto, Tetsuya Kawanishi:
30 GHz Radio over FSO System using High Speed 2D-PDA and Its Optical Path Switching Performance. ECOC 2020: 1-4 - [c21]Yuki Yoshida, Toshimasa Umezawa, Atsushi Kanno, Naokatsu Yamamoto:
Phase-Retrieving Coherent Reception and its Sample Complexity. ECOC 2020: 1-4 - [c20]Toshimasa Umezawa, Yuki Yoshida, Atsushi Kanno, Naokatsu Yamamoto, Tetsuya Kawanishi:
High Speed 2D-PDA FSO Receiver for High Optical Alignment Robustness with Space Diversity. OFC 2020: 1-3 - [c19]Yuki Yoshida, Toshimasa Umezawa, Atsushi Kanno, Keizo Inagaki, Naokatsu Yamamoto, Tetsuya Kawanishi:
On the Sample Complexity of Phase-Retrieval Receiver Based on 2-D Arrayed Photodetectors. OFC 2020: 1-3
2010 – 2019
- 2019
- [c18]Pham Tien Dat, Atsushi Kanno, Keizo Inagaki, Toshimasa Umezawa, Naokatsu Yamamoto, Tetsuya Kawanishi:
Hybrid Optical Wireless-mmWave: Ultra High-Speed Indoor Communications for Beyond 5G. INFOCOM Workshops 2019: 1003-1004 - [c17]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:
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. OFC 2019: 1-3 - [c16]Toshimasa Umezawa, Atsushi Matsumoto, Atsushi Kanno, Naokatsu Yamamoto, Tetsuya Kawanishi:
1-λ, 16-Parallel Lanes, 50-Gbaud On-Off Keying Multi-Core Fiber Communication Directly Coupled to High Speed 2D-Photodetector Array. OFC 2019: 1-3 - [c15]Yuki Yoshida, Toshimasa Umezawa, Atsushi Kanno, Naokatsu Yamamoto:
Coherent Detection Only by 2-D Photodetector Array: A Discreteness-Aware Phase Retrieval Approach. OFC 2019: 1-3 - [c14]Ken Kusakata, S. Takamizawa, Toshimasa Umezawa, Naokatsu Yamamoto, Tetsuya Kawanishi:
Characterization of 2D high-speed photodetector array device for SDM fiber communication applications. OECC/PSC 2019: 1-3 - 2018
- [c13]Toshimasa Umezawa, Takahide Sakamoto, Atsushi Kanno, Shinya Nakajima, Atsushi Matsumoto, Naokatsu Yamamoto, Tetsuya Kawanishi:
400-Gbps Space Division Multiplexing Optical Wireless Communication Using Two-Dimensional Photodetector Array. ECOC 2018: 1-3 - [c12]Pham Tien Dat, Atsushi Kanno, Keizo Inagaki, Toshimasa Umezawa, François Rottenberg, Jérôme Louveaux, Naokatsu Yamamoto, Tetsuya Kawanishi:
High-Speed and Handover-Free Communications for High-Speed Trains Using Switched WDM Fiber-Wireless System. OFC 2018: 1-3 - [c11]Toshimasa Umezawa, Takahide Sakamoto, Atsushi Kanno, Kouichi Akahane, Atsushi Matsumoto, Naokatsu Yamamoto, Tetsuya Kawanishi:
High-speed Two-dimensional Photodetector Array for 4-WDM 25-Gbaud FSO Communication. OFC 2018: 1-3 - 2017
- [c10]Takahide Sakamoto, Toshimasa Umezawa, Guo-Wei Lu, Kouichi Akahane, Atsushi Matsumoto, Atsushi Kanno, Naokatsu Yamamoto, Tetsuya Kawanishi:
Spatial Coherent Matched Detection Using High-Speed Two Dimensional Photo-Diode Array for Full-Channel Demultiplexing and Demodulation of Mode-Division-Multiplexed Signals. ECOC 2017: 1-3 - [c9]Toshimasa Umezawa, Tadashige Sakamoto, Atsushi Kanno, Ken Kusakata, Kouichi Akahane, Atsushi Matsumoto, Naokatsu Yamamoto, Tetsuya Kawanishi:
Dense SDM 32-Pixel 2-D Photodetector Array. ECOC 2017: 1-3 - [c8]Toshimasa Umezawa, Pham Tien Dat, Eiichi Hase, Kenichi Kashima, Atsushi Kanno, Kouichi Akahane, Atsushi Matsumoto, Naokatsu Yamamoto, Tetsuya Kawanishi:
100 GHz optical-to-radio converter module and its application in radio and power over fiber transmission through multi-core fiber. OFC 2017: 1-3 - [c7]Pham Tien Dat, Atsushi Kanno, Toshimasa Umezawa:
Advanced Photonic Technologies for Future Mobile Communications and Imaging. SoICT 2017: 1 - 2016
- [c6]Toshimasa Umezawa, Kunihisa Jitsuno, Nobuhiko Shibagaki, Atsushi Kanno, Kouichi Akahane, A. Mstsumoto, Naokatsu Yamamoto, Tetsuya Kawanishi:
31-GHz single-carrier, 44.6-Gbps photonic wireless transmission using a wide-bandwidth high power photodetector and a pre-distortion technique. OFC 2016: 1-3 - 2015
- [j1]Naokatsu Yamamoto, Kouichi Akahane, Toshimasa Umezawa, Tetsuya Kawanishi:
A 1.55-µm Waveband Optical Absorption Characterization of an Electro-Absorption Device with a Highly Stacked InAs/InGaAlAs Quantum Dot Structure. IEICE Trans. Electron. 98-C(8): 878-881 (2015) - [c5]Toshimasa Umezawa, Kouichi Akahane, Naokatsu Yamamoto, Atsushi Kanno, Tetsuya Kawanishi:
Bias free operational 107-Gbaud ultra-fast photodetector. ECOC 2015: 1-3 - [c4]Toshimasa Umezawa, Kouichi Akahane, Naokatsu Yamamoto, Atsushi Kanno, Keizo Inagaki, Tetsuya Kawanishi:
Zero-bias operational ultra-broadband UTC-PD above 110 GHz for high symbol rate PD-array in high-density photonic integration. OFC 2015: 1-3 - [c3]Naokatsu Yamamoto, Kouichi Akahane, Toshimasa Umezawa, Tetsuya Kawanishi:
Monolithically integrated quantum-dot optical modulator with semiconductor optical amplifier for 1.3µm waveband error-free 10-km-long transmission. OFC 2015: 1-3 - 2014
- [c2]Kouichi Akahane, Naokatsu Yamamoto, Atsushi Kanno, Toshimasa Umezawa, Tetsuya Kawanishi:
Quantum dot two-mode laser at 1.55 μm-band for 90GHz radio over fiber applications. ECOC 2014: 1-3 - [c1]Tetsuya Kawanishi, Naokatsu Yamamoto, Toshimasa Umezawa, Kouichi Akahane, Atsushi Kanno, Pham Tien Dat:
Electro-optic devices for imaging systems using radio-over-fibre. ICTON 2014: 1-4
Coauthor Index
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