Reduction of phase-difference deviation in 90° optical hybrid over wide wavelength range. - Yohei Sakamaki; Yusuke Nasu; Toshikazu Hashimoto; Kuninori Hattori; Takashi Saida; Hiroshi Takahashi (IEICE Electron. Express, 2010)

Compact and Athermal DQPSK Demodulator with Silica-Based Planar Lightwave Circuit. - Yusuke Nasu; Yohei Sakamaki; Kuninori Hattori; Shin Kamei; Toshikazu Hashimoto; Takashi Saida; Hiroshi Takahashi; Yasuyuki Inoue (IEICE Trans. Electron., 2010)

Ultra-compact and low-loss silica-based dual polarization optical hybrid for digital coherent receiver with excellent common-mode rejection ratio. - Takayuki Mizuno; Takashi Saida; Yusuke Nasu; Takashi Yamada; Yasuaki Hashizume; Hiroshi Takahashi (OFC/NFOEC, 2013)

Silicon Photonics Coherent Optical Subassembly with EO and OE Bandwidths of over 50 GHz. - Shogo Yamanaka; Y. Ikuma; Toshihiro Itoh; Yuriko Kawamura; Kiyofumi Kikuchi; Y. Kurata; Makoto Jizodo; Teruo Jyo; S. Soma; Masayuki Takahashi; Ken Tsuzuki; Munehiko Nagatani; et al. (OFC, 2020)

Silicon Photonics Coherent Optical Subassembly for High-Data-Rate Signal Transmissions. - Shogo Yamanaka; Yusuke Nasu (OFC, 2021)