High-Speed EA-DFB Laser for 40-G and 100-Gbps. - Shigeki Makino; Kazunori Shinoda; Takeshi Kitatani; Hiroaki Hayashi; Takashi Shiota; Shigehisa Tanaka; Masahiro Aoki; Noriko Sasada; Kazuhiko Naoe (IEICE Trans. Electron., 2009)

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)

Wide-Tuning-Wavelength-Range LGLC Laser with Low-Loss Dual-Core Spot Size Converter. - Takanori Suzuki; Hideo Arimoto; Takeshi Kitatani; Aki Takei; Takafumi Taniguchi; Kazunori Shinoda; Shigehisa Tanaka; Shinji Tsuji; Tatemi Ido; Jun Igrashi; Atsushi Nakamura; Kazuhiko Naoe; et al. (IEICE Trans. Electron., 2012)

28-Gb/s directly modulated InGaAlAs ACPM DFB lasers with high mask margin of 22% at 55°C. - Kouji Nakahara; Yuki Wakayama; K. Hiruma; Takeshi Kitatani; Kazunori Shinoda; T. Fukamachi; Yasushi Sakuma; Shigehisa Tanaka (OFC/NFOEC, 2013)

56-Gb/s direct modulation in InGaAlAs BH-DFB lasers at 55°C. - Kouji Nakahara; Yuki Wakayama; Takeshi Kitatani; Takafumi Taniguchi; Toshihiko Fukamachi; Yasushi Sakuma; Shigehisa Tanaka (OFC, 2014)

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 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)

Superior BER Transmission of 106-Gb/s/lane Skewless PAM4 over 10 km by Utilizing 1.3-μm Directly Modulated InGaAlAs-MQW BH Lasers and Incoherent Multiplexing of Two NRZ Signals. - Kouji Nakahara; Riu Hirai; Takeshi Kitatani; Nobuhiko Kikuchi; Takayoshi Fukui; Kaoru Okamoto; Yasushi Sakuma; Kohichi Robert Tamura; Shigehisa Tanaka (OFC, 2018)

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)

Analysis of TDECQ Dependence on Skew and Extinction Ratio with 106-Gb/s PAM-4 Modulation of Directly Modulated Submicron Ridge Localized Buried Heterostructure Lasers. - Kazuki Suga; Kouji Nakahara; Kaoru Okamoto; Shigenori Hayakawa; Masatoshi Arasawa; Tetsuya Nishida; Ryu Washino; Takeshi Kitatani; Masatoshi Mitaki; Hironori Sakamoto; Yasushi Sakuma; Shigehisa Tanaka (OFC, 2020)

Large-Optical-Aperture Top-Illuminated 50-Gbaud PIN-PD with High 3-dB Bandwidth at a Low Bias of 1.5 V. - Takashi Toyonaka; Hiroshi Hamada; Shigehisa Tanaka; Masatoshi Arasawa; Ryu Washino; Yasushi Sakuma; Kazuhiko Naoe (OFC, 2020)

112-Gb/s PAM-4 Uncooled Directly Modulated BH Lasers. - Kouji Nakahara; Kazuki Suga; Kaoru Okamoto; Shigenori Hayakawa; Masatoshi Arasawa; Tetsuya Nishida; Ryu Washino; Takeshi Kitatani; Masatoshi Mitaki; Hironori Sakamoto; Yasushi Sakuma; Shigehisa Tanaka (ECOC, 2021)

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)

Over 100 mW Uncooled Operation of SOA-integrated 1.3-µm Highly Reliable CW-DFB Laser. - Shoko Yokokawa; Atsushi Nakamura; Shigetaka Hamada; Ryosuke Nakajima; Kaoru Okamoto; Masatoshi Arasawa; Kouji Nakahara; Shigehisa Tanaka (OFC, 2022)

CW-WDM MSA compatible 100-mW (up to 50°C), 400-GHz spacing highly-reliable CW-DFB 8-channel laser array. - Ryosuke Hatai; Kouji Nakahara; Atsushi Nakamura; Takayuki Nakajima; Yoshihiko Kobayashi; Takeo Kageyama; Shigehisa Tanaka (OFC, 2024)

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)