Kouichi Akahane

50 papers Journal 10Unranked 40
YearRankTypeTitle / Venue / Authors
2025 — conf
$150-\text{GHz}$ Bandwidth, -30 dB CMRR Balanced Photodetector for High-Baud Rate PSK Signal Detection.
ECOC
Toshimasa Umezawa, Shinya Nakajima, Atsushi Matsumoto, Kouichi Akahane, Naokatsu Yamamoto
2025 — conf
Demonstration of Photodetector-Array-Based Reconfigurable Mode-Division-Multiplexing Coherent Receiver for Spatial Modes Varying Two Indices.
ECOC
Zile Jiang, Xinzhou Su, Huibin Zhou, Abdulrahman Alhaddad, Muralekrishnan Ramakrishnan, Yuxiang Duan, Toshimasa Umezawa, Yuki Yoshida, Kouichi Akahane, Alan E. Willner
2025 — conf
Fully Packaged 100-GHz-Bandwidth EO-Equalizer-Integrated TFLN Modulator with Record-High Slope Efficiency Enabling 200-GBaud Signaling.
OFC
Yuya Yamaguchi, Paikun Zhu, Pham Tien Dat, Shingo Takano, Shotaro Hirata, Yu Kataoka, Junichiro Ichikawa, Ryo Shimizu, Kouichi Akahane, Naokatsu Yamamoto, Atsushi Kanno, Tetsuya Kawanishi
2025 — conf
International Testbed Data Sharing Framework with Data Sovereign Features for Network AI/ML Empowerment.
OFC
Yusuke Hirota, Sugang Xu, Angela Mitrovska, Yuki Yoshida, Pooyan Safari, Behnam Shariati, Johannes K. Fischer, Ronald Freund, Hideaki Furukawa, Kouichi Akahane, Yoshinari Awaji
2025 — conf
Low-Complexity Digital Twinning of Optical I/Q Modulator by Direct-Detection with Widely Non-Linear Phase Retrieval.
OFC
Yuki Yoshida, Shoichiro Oda, Naokatsu Yamamoto, Takeshi Hoshida, Kouichi Akahane
2025 — conf
Pairwise SDM Transmission Resolving Fiber Dispersion in Up-to-200Gbps/Lane Multicore Fiber IM-DD Systems for Edge and Inter-Datacenter Networks.
ECOC
Paikun Zhu, Yuki Yoshida, Kouichi Akahane, Ken-ichi Kitayama, Bahram Jalali
2025 — conf
Pairwise Transmission Enabling Dispersion-unconstrained Multilane IM-DD Systems Beyond 100G-per-lane.
OFC
Paikun Zhu, Yuki Yoshida, Kouichi Akahane, Ken-ichi Kitayama, Bahram Jalali
2025 — conf
Photonics-Enabled Simultaneous Demultiplexing and Down-Conversion of $220 ~\text{Gb} / \mathrm{s}$ Aggregate 300 GHz Terahertz Signals.
ECOC
Pham Tien Dat, Yuya Yamaguchi, Keizo Inagaki, Yuki Yoshida, Atsushi Kanno, Naokatsu Yamamoto, Kouichi Akahane
2025 — conf
Sub-Terahertz Signal Demultiplexing and Downconversion Using Photonic Technology.
OFC
Pham Tien Dat, Yuya Yamaguchi, Yuki Yoshida, Atsushi Kanno, Naokatsu Yamamoto, Tetsuya Kawanishi, Kouichi Akahane
2024 — conf
151.5-GHz Sub-THz Signal Reception and Downconversion Using All-Optical Technology.
OFC
Pham Tien Dat, Yuya Yamaguchi, Shingo Takano, Shotaro Hirata, Junichiro Ichikawa, Ryo Shimizu, Keizo Inagaki, Isao Morohashi, Yuki Yoshida, Atsushi Kanno, Naokatsu Yamamoto, Kouichi Akahane
2024 — conf
40-Gbit/s Mobile FSO with High-speed Beam Stabilizer and 2D-PDA-based Diversity Receiver for Support Robots.
OFC
Zu-Kai Weng, Yuki Yoshida, Toshimasa Umezawa, Abdelmoula Bekkali, Michikazu Hattori, Atsushi Matsumoto, Atsushi Kanno, Naokatsu Yamamoto, Tetsuya Kawanishi, Kouichi Akahane
2024 — conf
5G NR Signal Transparent Transmission Over a Converged Fiber-THz-Fiber-mmWave System.
INFOCOM (Workshops)
Pham Tien Dat, Yuya Yamaguchi, Keizo Inagaki, Kouichi Akahane
2024 — conf
All-in-one TO-can-Packed RGB-LD Lamp Enables 40-Gbit/s White-lighting Wireless DMT Link.
OFC
Gong-Ru Lin, Chih-Hsien Cheng, Po-Lun Chen, Pin-Wei Ho, Szu-En Lai, Yi-Chien Wu, Yu-Sheng Liao, Yu-Chieh Chi, Atsushi Matsumoto, Kouichi Akahane
2024 — conf
DC-226 GHz well-impedance-matched high-speed photoreceiver for multi-band signal detection.
OFC
Toshimasa Umezawa, Pham Tien Dat, Yuki Yoshida, Shinya Nakajima, Atsushi Matsumoto, Kouichi Akahane, Atsushi Kanno, Naokatsu Yamamoto
2024 — conf
Demonstration of Robust Mobile Free Space Optical System using High-speed Beam Tracking and 2D-PDA-based Spatial-Diversity Reception.
OFC
Zu-Kai Weng, Yuki Yoshida, Toshimasa Umezawa, Abdelmoula Bekkali, Michikazu Hattori, Atsushi Matsumoto, Atsushi Kanno, Naokatsu Yamamoto, Tetsuya Kawanishi, Kouichi Akahane
2024 — conf
Enabling Fiber-Wireless Technologies For Radio Communications In Millimeter-Wave and Terahertz-Wave Bands In IMT-2030 and Beyond.
ITU K
Pham Tien Dat, Yuya Yamaguchi, Kouichi Akahane
2024 J jnl
High-Responsivity Unitraveling Carrier-Type Photodetector Using Avalanche InAlAs as a Collector at a High-Frequency Range.
IEEE Access
Yaofeng Yi, Toshimasa Umezawa, Kouichi Akahane, Tetsuya Kawanishi
2024 J jnl
High-speed reach-extended IM-DD system with low-complexity DSP for 6G fronthaul [Invited].
J. Opt. Commun. Netw.
Paikun Zhu, Yuki Yoshida, Kouichi Akahane, Ken-ichi Kitayama
2024 — conf
Low-Divergent 940-nm Photonic-Crystal Surface-Emitting Laser for Short-Reach Free-Space Data Link.
OFC
Chih-Hsien Cheng, Po-Lun Chen, Pin-Wei Ho, Yu-Heng Hong, Shih-Chen Chen, Shu-Wei Chang, Chao-Hsin Wu, Hao-Chung Kuo, Atsushi Matsumoto, Kouichi Akahane, Gong-Ru Lin
2024 J jnl
Optical Mode Multiplexer Using LiNbO
IEICE Trans. Electron.
Shotaro Yasumori, Seiya Morikawa, Takanori Sato, Tadashi Kawai, Akira Enokihara, Shinya Nakajima, Kouichi Akahane
2024 — conf
Radio-Over-X (RoX) Technologies for Future Local Access Network.
ICC Workshops
Toshiaki Kuri, Pham Tien Dat, Kouichi Akahane
2024 — conf
Reach Extension of Net-200G/λ IM-DD PAM4 Links to Beyond-100km with Low-complexity Using OE-EQ.
OFC
Paikun Zhu, Yuki Yoshida, Kouichi Akahane, Ken-ichi Kitayama
2024 J jnl
Thermal Study for High-Photocurrent Photodetector in Non-Saturation Region Using Thin Substrate, Thin Absorber, and Flip- Chip Bonding Process.
IEEE Access
Yaofeng Yi, Toshimasa Umezawa, Kouichi Akahane, Tetsuya Kawanishi
2024 — conf
Thin-Film Lithium Niobate Modulator for a Flat Frequency-Response over 110 GHz Bandwidth with Integrated Electro-Optic Frequency-Domain Equalizer.
OFC
Yuya Yamaguchi, Pham Tien Dat, Naokatsu Yamamoto, Kouichi Akahane, Atsushi Kanno, Tetsuya Kawanishi
2023 — conf
100-Gbps 2-SDM 2-WDM FSO beam direct detection using resonant cavity 4x4 photodetector array.
OFC
Toshimasa Umezawa, Atsushi Matsumoto, Kouichi Akahane, Atsushi Kanno, Naokatsu Yamamoto
2023 — conf
DSP-enhanced Radio-over-fiber Xhaul Networks Toward Beyond-5G.
OFC
Paikun Zhu, Yuki Yoshida, Atsushi Kanno, Kouichi Akahane, Ken-ichi Kitayama
2023 — conf
Delay Compensated Quad-level Delta-sigma Modulation Dual-color DRoF System for Beyond 5G Mobile Fronthaul.
OFC
Zu-Kai Weng, Pham Tien Dat, Atsushi Kanno, Tetsuya Kawanishi, Kouichi Akahane
2023 — conf
Dispersion Compensation over C-band WDM Grid for 100Gb/s PAM4 System by Low-complexity Optoelectronic Feedforward Equalization (OE-FFE).
OFC
Paikun Zhu, Yuki Yoshida, Atsushi Kanno, Kouichi Akahane, Ken-ichi Kitayama
2023 — conf
Transparent Radio-Fiber-Radio-Fiber System in 100-GHz Band for Indoor Uplink Signal Transmission in Beyond 5G.
OFC
Pham Tien Dat, Yuya Yamaguchi, Atsushi Kanno, Naokatsu Yamamoto, Tetsuya Kawanishi, Kouichi Akahane
2023 — conf
Transparent Relay and Switching of THz-wave Signals in 285-GHz Band Using Photonic Technology.
OFC
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
2022 — conf
400-pixel high-speed photodetector for high optical alignment robustness FSO receiver.
OFC
Toshimasa Umezawa, Atsushi Matsumoto, Kouichi Akahane, Atsushi Kanno, Naokatsu Yamamoto
2022 — conf
60-Gb/s D-Band Wireless Signal Generation and Transmission Using Photonic Technology.
RIVF
Pham Tien Dat, Keizo Inagaki, Atsushi Kanno, Kouichi Akahane
2022 J jnl
Admittance Spectroscopy Up to 67 GHz in InGaAs/InAlAs Triple-Barrier Resonant Tunneling Diodes.
IEICE Trans. Electron.
Kotaro Aikawa, Michihiko Suhara, Takumi Kimura, Junki Wakayama, Takeshi Makino, Katsuhiro Usui, Kiyoto Asakawa, Kouichi Akahane, Issei Watanabe
2022 — conf
Photonic Approach to Reinforcement Learning.
OECC/PSC
Makoto Naruse, Atsushi Uchida, Kazuharu Uchiyama, Kouichi Akahane
2018 — conf
High-speed Two-dimensional Photodetector Array for 4-WDM 25-Gbaud FSO Communication.
OFC
Toshimasa Umezawa, Takahide Sakamoto, Atsushi Kanno, Kouichi Akahane, Atsushi Matsumoto, Naokatsu Yamamoto, Tetsuya Kawanishi
2017 — conf
100 GHz optical-to-radio converter module and its application in radio and power over fiber transmission through multi-core fiber.
OFC
Toshimasa Umezawa, Pham Tien Dat, Eiichi Hase, Kenichi Kashima, Atsushi Kanno, Kouichi Akahane, Atsushi Matsumoto, Naokatsu Yamamoto, Tetsuya Kawanishi
2017 — conf
Dense SDM 32-Pixel 2-D Photodetector Array.
ECOC
Toshimasa Umezawa, Tadashige Sakamoto, Atsushi Kanno, Ken Kusakata, Kouichi Akahane, Atsushi Matsumoto, Naokatsu Yamamoto, Tetsuya Kawanishi
2017 — conf
Spatial Coherent Matched Detection Using High-Speed Two Dimensional Photo-Diode Array for Full-Channel Demultiplexing and Demodulation of Mode-Division-Multiplexed Signals.
ECOC
Takahide Sakamoto, Toshimasa Umezawa, Guo-Wei Lu, Kouichi Akahane, Atsushi Matsumoto, Atsushi Kanno, Naokatsu Yamamoto, Tetsuya Kawanishi
2016 — conf
31-GHz single-carrier, 44.6-Gbps photonic wireless transmission using a wide-bandwidth high power photodetector and a pre-distortion technique.
OFC
Toshimasa Umezawa, Kunihisa Jitsuno, Nobuhiko Shibagaki, Atsushi Kanno, Kouichi Akahane, A. Mstsumoto, Naokatsu Yamamoto, Tetsuya Kawanishi
2015 J jnl
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.
Naokatsu Yamamoto, Kouichi Akahane, Toshimasa Umezawa, Tetsuya Kawanishi
2015 — conf
Bias free operational 107-Gbaud ultra-fast photodetector.
ECOC
Toshimasa Umezawa, Kouichi Akahane, Naokatsu Yamamoto, Atsushi Kanno, Tetsuya Kawanishi
2015 — conf
Monolithically integrated quantum-dot optical modulator with semiconductor optical amplifier for 1.3µm waveband error-free 10-km-long transmission.
OFC
Naokatsu Yamamoto, Kouichi Akahane, Toshimasa Umezawa, Tetsuya Kawanishi
2015 — conf
Multifunctional all-optical signal processing scheme for simultaneous multichannel WDM multicast and XOR logic gates based on FWM in QD-SOA.
OFC
Danshi Wang, Min Zhang, Guo-Wei Lu, Jun Qin, Takahide Sakamoto, Kouichi Akahane, Naokatsu Yamamoto, Tetsuya Kawanishi, Ze Li, Yue Cui
2015 — conf
Zero-bias operational ultra-broadband UTC-PD above 110 GHz for high symbol rate PD-array in high-density photonic integration.
OFC
Toshimasa Umezawa, Kouichi Akahane, Naokatsu Yamamoto, Atsushi Kanno, Keizo Inagaki, Tetsuya Kawanishi
2014 — conf
Electro-optic devices for imaging systems using radio-over-fibre.
ICTON
Tetsuya Kawanishi, Naokatsu Yamamoto, Toshimasa Umezawa, Kouichi Akahane, Atsushi Kanno, Pham Tien Dat
2014 — conf
Quantum dot two-mode laser at 1.55 μm-band for 90GHz radio over fiber applications.
ECOC
Kouichi Akahane, Naokatsu Yamamoto, Atsushi Kanno, Toshimasa Umezawa, Tetsuya Kawanishi
2013 J jnl
10-GHz High-Repetition Optical Short Pulse Generation from Wavelength-Tunable Quantum Dot Optical Frequency Comb Laser.
IEICE Trans. Electron.
Naokatsu Yamamoto, Kouichi Akahane, Tetsuya Kawanishi, Hideyuki Sotobayashi, Yuki Yoshioka, Hiroshi Takai
2012 J jnl
Skew Dependence of Nanophotonic Devices Based on Optical Near-Field Interactions.
ACM J. Emerg. Technol. Comput. Syst.
Makoto Naruse, Ferdinand Peper, Kouichi Akahane, Naokatsu Yamamoto, Tadashi Kawazoe, Naoya Tate, Motoichi Ohtsu
2009 J jnl
Experimental study on the condition of the formation of electric field domains in multiple finite-superlattices.
Microelectron. J.
Naoki Ohtani, S. Noma, Kouichi Akahane, M. Hosoda, K. Fujita
2007 J jnl
Novel Functionality and Material for Si-Photonics: Two-Photon Absorption Switching and Antimonide Hetero-Genius Epitaxy.
IEICE Trans. Electron.
Tak-Keung Liang, Kouichi Akahane, Naokatsu Yamamoto, Luis Romeu Nunes, Tetsuya Kawanishi, Masahiro Tsuchiya