120.7-Tb/s (7 SDM/180 WDM/95.8 Gb/s) MCF-ROPA un epeatered transmission of PDM-32QAM channels over 204 km. - Hidehiko Takara; Takayuki Mizuno; H. Kawakami; Yutaka Miyamoto; Hiroji Masuda; K. Kitamura; Hirotaka Ono 002; S. Asakawa; Yoshimichi Amma; Keisuke Hirakawa; S. Matsuo; K. Tsujikawa; et al. (ECOC, 2014)

Multicore-fiber cable with core density of 6 cores/mm2. - Itaru Ishida; Yoshimichi Amma; Keisuke Hirakawa; Hitoshi Uemura; Yusuke Sasaki; Katsuhiro Takenaga; Naoto Itou; Ken Osato; Shoichiro Matsuo (OFC, 2014)

Evaluation of Inter-Core Skew in an Uncoupled Multicore Fibre. - Yusuke Sasaki; Keisuke Hirakawa; Itaru Ishida; Shoichiro Matsuo; Kazuhiko Aikawa (ECOC, 2017)

Thermally expanded core fiber with a 4-μm mode field diameter suitable for low-loss coupling with silicon photonic devices. - Takuya Oda; Keisuke Hirakawa; Kentaro Ichii; Satoshi Yamamoto; Kazuhiko Aikawa (OFC, 2017)