A 35-GHz, 0.8-A/W and 26-µm Misalignment Tolerance Microlens-Integrated p-i-n Photodiodes. - Yong Lee; Kazuyuki Nagatsuma; Kazuhiko Hosomi; Takuma Ban; Kazunori Shinoda; Koichiro Adachi; Shinji Tsuji; Yasunobu Matsuoka; Shigehisa Tanaka; Reiko Mita; Toshiki Sugawara; Masahiro Aoki (IEICE Trans. Electron., 2011)

A 25 Gb/s 65-nm CMOS Low-Power Laser Diode Driver With Mutually Coupled Peaking Inductors for Optical Interconnects. - Norio Chujo; Toshiaki Takai; Toshiki Sugawara; Yasunobu Matsuoka; Daichi Kawamura; Koichiro Adachi; Tsuneo Kawamata; Tsuneo Ohno; Kenichi Ohhata (IEEE Trans. Circuits Syst. I Regul. Pap., 2011)

Compact and power-efficient 100-Gbps CMOS-based transceiver. - Takashi Takemoto; Hiroki Yamashita; Fumio Yuki; Shinji Tsuji; Yong Lee; Koichiro Adachi; Kazunori Shinoda; Yasunobu Matsuoka; Toshiki Sugawara; Shinji Nishimura; Norio Chujo; Masaaki Nido; et al. (OFC/NFOEC, 2013)

25 Gb/s 150-m Multi-Mode Fiber Transmission Using a CMOS-Driven 1.3-µm Lens-Integrated Surface-Emitting Laser. - Daichi Kawamura; Toshiaki Takai; Yong Lee; Kenji Kogo; Koichiro Adachi; Yasunobu Matsuoka; Norio Chujo; Reiko Mita; Saori Hamamura; Satoshi Kaneko; Kinya Yamazaki; Yoshiaki Ishigami; et al. (IEICE Trans. Electron., 2013)

High-efficiency optical coupling to SMF array and high-temperature 25-Gb/s operation of lens-integrated surface-emitting laser toward PSM4 optical module. - Koichiro Adachi; Aki Takei; Takanori Suzuki; Shigehisa Tanak; Akira Nakanishi; Kazuhiko Naoe (ECOC, 2014)

Facet-free surface-emitting 1.3-μm DFB laser. - Koichiro Adachi; Takanori Suzuki; T. Ohtoshi; K. Nakahara; M. Sagawa; Akira Nakanishi; Kazuhiko Naoe; Shigehisa Tanak (ECOC, 2015)

Wide-temperature-range 103.2 (25.8 × 4)-Gb/s optical link for data-center Interconnects using a 1.3-µm lens-integrated surface-emitting laser array. - Koichiro Adachi; Yasunobu Matsuoka; Takashi Takemoto; Takanori Suzuki; Shigehisa Tanaka; Akira Nakanishi; Kazuhiko Naoe (OFC, 2015)

Capability of high optical-feedback tolerance and non-hermetic-packaging for low-cost interconnections using lens-integrated surface-emitting laser. - Takanori Suzuki; Koichiro Adachi; Aki Takei; Yuki Wakayama; Akira Nakanishi; Kazuhiko Naoe; Kouji Nakahara; Shigehisa Tanaka; Kazuhisa Uomi (OFC, 2015)

A 50-Gb/s NRZ-modulated optical transmitter based on a DFB-LD and a 0.18-µm SiGe BiCMOS LD driver. - Takashi Takemoto; Yasunobu Matsuoka; Yoshikazu Sugiyama; Hidenori Yonezawa; Hiroki Yamashita; Koichiro Adachi; Takahiro Nakamura; Etsuko Nomoto; Kouji Nakahara; Hideo Arimoto; Kenichi Osada; Tatemi Ido (OFC, 2015)

A facet-free 1.3-µm surface-emitting DFB laser for a low-cost optical module. - Koichiro Adachi; Takanori Suzuki; Kouji Nakahara; Shigehisa Tanaka; Akira Nakanishi; Kazuhiko Naoe (IEICE Electron. Express, 2016)

Monolithically integrated 4 ch × 25.8 Gbps lens-integrated surface-emitting DFB laser array directly coupled to SMF. - Koichiro Adachi; Takanori Suzuki; Aki Takei; Kouji Nakahara; Shigehisa Tanaka; Akira Nakanishi; Kazuhiko Naoe (IEICE Electron. Express, 2016)

Experimental Study of Adjustable Single-Mode Optical-Coupling Using Movable Micro-Mirror Array. - Takanori Suzuki; Koichiro Adachi; Shigehisa Tanaka (ECOC, 2017)

A passive optical alignment technique for single-mode fibers and light-source arrays. - Koichiro Adachi; Akira Nakanishi; Takanori Suzuki; Hiroki Irie; Yusuke Sasaki; T. Aoki; Masato Shishikura; Kazuhiko Naoe; Shigehisa Tanaka (OFC, 2017)

A Lens-Integrated Surface-Emitting DFB Laser and Its Application to Cost-Effective Single-Mode Optical Sub Assembly. - Koichiro Adachi; Takanori Suzuki; Shigehisa Tanaka (IEICE Trans. Electron., 2018)

53-Gbaud PAM4 Differential Drive of a Conventional EA/DFB Toward Driver-Amplifier-Less Optical Transceivers. - Koichiro Adachi; Takayoshi Fukui; Masato Shishikura; Akira Nakanishi; Atsushi Nakamura; Takanori Suzuki; Shigehisa Tanaka (OFC, 2019)

Direct Differential Drive of a Conventional 53-Gbaud EA-DFB using Commercially Available DSP. - Koichiro Adachi; S. Tanaka (ECOC, 2020)

Wide-temperature-range 100-Gbaud Operation of a Lumped-electrode-type EA-DFB for an 800-Gb/s Optical Transceiver. - Koichiro Adachi; Syunya Yamauchi; Hideaki Asakura; Atsushi Nakamura; Kazuhiko Naoe; Shigehisa Tanak (ECOC, 2020)

224-Gb/s PAM4 Uncooled Operation of Lumped-electrode EA-DFB Lasers with 2-km Transmission for 800GbE Application. - Syunya Yamauchi; Koichiro Adachi; Hideaki Asakura; Hayato Takita; Yoshihiro Nakai; Yoriyoshi Yamaguchi; Masatoshi Mitaki; Ryosuke Nakajima; Shigehisa Tanaka; Kazuhiko Naoe (OFC, 2021)

226 Gbps PAM4 Operation Using Differential Drive EA-DFB Laser with 2.0-Vppd Swing over 10-km SSMF Transmission for 1.6TbE Transceivers. - Shuhei Ohno; Takanori Suzuki; Hideaki Matsuzaki; Koichiro Adachi; Ryosuke Hatai; Ryo Nakao; Shinichi Tanaka; Atsushi Mimura; Takashi Suzuki; Noriko Sasada; Shigehisa Tanaka; Kazuhiko Naoe (OFC, 2025)