Novel wavelength tunable filter offering multi-stage selection for colorless, directionless, and contentionless ROADMs. - Tomonobu Niwa; Hiroshi Hasegawa; Ken-ichi Sato; Toshio Watanabe; Hiroshi Takahashi; Masayuki Okuno (IEICE Electron. Express, 2012)

A 270 × 270 optical cross-connect switch utilizing wavelength routing with cascaded AWGs. - Tomonobu Niwa; Hiroshi Hasegawa; Ken-ichi Sato (OFC/NFOEC, 2013)

Compact integrated tunable filter utilizing AWG routing function and small switches. - Tomonobu Niwa; Hiroshi Hasegawa; Ken-ichi Sato; Toshio Watanabe; Hiroshi Takahashi; S. Soma (OFC/NFOEC, 2013)

A large-scale wavelength routing optical switch for data center networks. - Ken-ichi Sato; Hiroshi Hasegawa; Tomonobu Niwa; Toshio Watanabe (IEEE Commun. Mag., 2013)

Universal fault detection for NFV using SOM-based clustering. - Tomonobu Niwa; Masanori Miyazawa; Michiaki Hayashi; Rolf Stadler (APNOMS, 2015)

Anomaly detection for openstack services with process-related topological analysis. - Tomonobu Niwa; Yuki Kasuya; Takeshi Kitahara (CNSM, 2017)