InP-Based Photodetectors Monolithically Integrated with 90° Hybrid toward Over 400Gb/s Coherent Transmission Systems. - Hideki Yagi; Takuya Okimoto; Naoko Inoue; Koji Ebihara; Kenji Sakurai; Munetaka Kurokawa; Satoru Okamoto; Kazuhiko Horino; Tatsuya Takeuchi; Kouichiro Yamazaki; Yoshifumi Nishimoto; Yasuo Yamasaki; et al. (IEICE Trans. Electron., 2019)

High Linearity and Uniform Characteristics of InP-Based 8-CH Waveguide Avalanche Photodiode Array for 400 GbE. - Takuya Okimoto; Ken Ashizawa; Koji Ebihara; Satoru Okamoto; Takumi Endo; Kazuhiko Horino; Tatsuya Takeuchi; Toru Uchida; Hideki Yagi; Yoshihiro Yoneda (OFC, 2020)

High Optical Output Power and High-responsivity IC-TROSA for 800 Gbps applications. - Munetaka Kurokawa; Kenichi Nakayama; Masaru Takechi; Yasutaka Mizuno; Taichi Misawa; Eiichi Banno; Hiroshi Uemura; Yoshiyuki Sugimoto; Seiji Kumagai; Takuya Okimoto; Naoya Kono; Tsutomu Ishikawa; et al. (ECOC, 2021)

InP-based PIC integrated with Butt-joint Coupled Waveguide p-i-n PDs for 100GBaud Coherent Networks. - Takuya Okimoto; Hideki Yagi; Koji Ebihara; Kouichiro Yamazaki; Satoru Okamoto; Yusuke Ohkura; Kazuhiko Horino; Ken Ashizawa; Mitsuru Ekawa; Yoshihiro Yoneda (OFC, 2021)

106-Gb/s Waveguide AlInAs/GaInAs Avalanche Photodiode with Butt-joint Coupling Structure. - Takuya Okimoto; Ken Ashizawa; Hiroki Mori; Koji Ebihara; Kouichiro Yamazaki; Satoru Okamoto; Kazuhiko Horino; Yusuke Ohkura; Hideki Yagi; Mitsuru Ekawa; Yoshihiro Yoneda (OFC, 2022)

Compact Power Splitters with Mosaic-based Structure Designed by Bayesian Direct-binary-search Method. - Takuya Mitarai; Takeshi Fujisawa; Takuya Okimoto; Naoya Kono; Naoki Fujiwara; Yusuke Sawada; Taichi Muratsubaki; Takanori Sato; Kunimasa Saitoh; Hideki Yagi (OECC/PSC, 2022)

A Shunt-Feedback TIA with Common-Base Variable Gain Input Stage for 128-GBaud Coherent Communication. - Seiji Kumagai; Yoshiyuki Sugimoto; Hiroshi Uemura; Munetaka Kurokawa; Naoki Itabashi; Masaru Takechi; Takuya Okimoto; Keiji Tanaka (BCICTS, 2023)

80-GHz Bandwidth and High Responsivity of InP Coherent Receiver PIC with Butt-joint waveguide PDs. - Takuya Okimoto; Hideki Yagi; Ken Ashizawa; Kouichiro Yamazaki; Koji Ebihara; Satoru Okamoto; Kazuhiko Horino; Munetaka Kurokawa; Yoshiyuki Sugimoto; Seiji Kumagai; Keiji Tanaka; Masaru Takechi; et al. (OFC, 2023)

Silicon Photonic Multi-Wavelength Coherent Receiver Using Local Oscillator Optical Frequency Comb. - Shuntaro Maeda; Taichiro Fukui; Takuya Okimoto; Go Soma; Takuo Tanemura; Yoshiaki Nakano (PSC, 2023)

InP-based Optical Devices Integrated on Silicon Photonic Circuits. - Takuya Okimoto; Naoki Fujiwara; Naoko Inoue; Takuo Hiratani; Takehiko Kikuchi; Takuya Mitarai; Munetaka Kurokawa; Hajime Tanaka 002; Hidenari Fujikata; Tohma Watanabe; Toshiyuki Nitta; Nobuhiko Nishiyama; et al. (OFC, 2024)

Compact WDM Coherent Transmitter using Silicon Micro-Ring Modulators. - Shuntaro Maeda; Takahiro Suganuma; Go Soma; Keita Hirashima; Takuya Okimoto; Yoshiaki Nakano; Takuo Tanemura (OFC, 2025)