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

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