Polarization-multiplexed, 10Gsymbol/s, 64QAM coherent transmission over 150km with OPLL-based homodyne detection employing narrow linewidth LDs. - Yixin Wang 011; Keisuke Kasai; Masataka Nakazawa (IEICE Electron. Express, 2011)

An LD-based ultra-low phase noise opll circuit using an optical voltage controlled oscillator. - Keisuke Kasai; Yixin Wang 011; Masataka Nakazawa (OFC/NFOEC, 2013)

60 Gbit/s, 64 QAM LD-based injection-locked coherent heterodyne transmission over 160 km with a spectral efficiency of 9 bit/s/Hz. - Yixin Wang 011; Keisuke Kasai; Masato Yoshida; Masataka Nakazawa (IEICE Electron. Express, 2014)

256 QAM (polarization-multiplexed, 5 Gsymbol/s) coherent transmission with an injection-locked homodyne detection technique. - Keisuke Kasai; Shohei Beppu; Yixin Wang 011; Masataka Nakazawa (OFC, 2015)

First demonstration of digital coherent transmission in a deployed ROADM network with a 120 Gbit/s polarization-multiplexed 64 QAM signal. - Toshihiko Hirooka; Keisuke Kasai; Yixin Wang 011; Masataka Nakazawa; Masaki Shiraiwa; Yoshinari Awaji; Naoya Wada (IEICE Electron. Express, 2015)

80 Gbit/s/ch, 256 QAM Digital Coherent Optical Transmission System with Injection-Locking for Next Generation Mobile Fronthaul Network. - Keisuke Kasai; Yixin Wang 011; Masato Yoshida; Toshihiko Hirooka; Katsumi Iwatsuki; Masataka Nakazawa (ECOC, 2017)

Single-carrier 216 Gbit/s, 12 Gsymbol/s 512 QAM coherent transmission over 160 km with injection-locked homodyne detection. - Yixin Wang 011; Keisuke Kasai; Masato Yoshida; Masataka Nakazawa (OFC, 2017)

Injection-locked Homodyne Detection for Higher-order QAM Transmission. - Keisuke Kasai; Yixin Wang 011; Masato Yoshida; Toshihiko Hirooka; Masataka Nakazawa (OFC, 2018)