Low-loss and Low-power-consumption wavelength tunable filter enabling colorless/directionless/contentionless optical drop in ROADMs. - Shoichi Takashina; Yojiro Mori; Hiroshi Hasegawa; Ken-ichi Sato; Toshio Watanabe (ECOC, 2014)

Low crosstalk wavelength tunable filter that utilizes symmetric and asymmetric Mach-Zehnder interferometers. - Shoichi Takashina; Yojiro Mori; Hiroshi Hasegawa; Ken-ichi Sato; Toshio Watanabe (OFC, 2014)

Demonstration of large-port-count and compact ROADM that exhibits virtual-C/D/C performance. - Shoichi Takashina; Hiroto Ishida; Yojiro Mori; Hiroshi Hasegawa; Ken-ichi Sato; Toshio Watanabe (OFC, 2015)