A study of laser white and brownian FM Noise in coherent QPSK signals. - Keisuke Matsuda; Hiroshi Bessho; Kiyotomo Hasegawa; Tsuyoshi Yoshida; Kazuyuki Ishida (OFC, 2014)

Compact InP MZM Optical Sub-Assembly with Built-in Electrical Filters by Three-Dimensional Packaging Technique. - Fukiko Hirose; Keita Mochizuki; Junichi Suzuki; Shusaku Hayashi; Yosuke Suzuki; Kiyotomo Hasegawa (OECC/PSC, 2019)

An integrated LAN-WDM 400-Gb/s (53Gbaud-PAM4) EML TOSA. - Yosuke Kawamoto; Nobuo Ohata; Tadashi Murao; Hayato Sano; Masashi Binkai; Yudai Imai; Tatsuo Hatta; Kiyotomo Hasegawa (OECC/PSC, 2019)

Grid Free WDM System Using External Cavity Multi-Wavelength Laser. - Kei Masuyama; Mizuki Shirao; Nobuhiko Nishiyama; Kiyotomo Hasegawa (OECC/PSC, 2019)

Wider Temperature Operation of EML in Miniaturized TOSA Package for 53 GBaud PAM-4. - Mizuki Shirao; Yoshimichi Morita; Kiyotomo Hasegawa (OECC/PSC, 2019)

A Cost Effective Hermetically Sealed 106 Gbit/s PAM4 EML TO-CAN For Beyond-5G Mobile Fronthaul. - Ryota Fujihara; Mizuki Shirao; Seiki Nakamura; Seiji Nakano; Kiyotomo Hasegawa (ECOC, 2020)

Si Photonics-Based Compact Wavelength Locker for Small Tunable Laser Modules with Low Power Consumption. - Junichi Suzuki; Kiyotomo Hasegawa; Nobuo Ohata (OECC/PSC, 2022)

Single Wavelength Laser TO-CAN Integrated with One-Chip Wavelength Locker. - Junichi Suzuki; Kiyotomo Hasegawa; Kei Masuyama; Nobuo Ohata (OFC, 2024)