Polarization diversity circuit based on silica waveguides and photonic crystal waveplates for a 4×4 silicon optical switch. - Koki Sugiyama; Takafumi Chiba; Ken Tanizawa; Keijiro Suzuki; Takayuki Kawashima; Shojiro Kawakami; Kazuhiro Ikeda; Hitoshi Kawashima; Hiroshi Takahashi; Hiroyuki Tsuda (IEICE Electron. Express, 2017)

Polarization Diversity Circuit Using Photonic Crystal Waveplates for 1.2-μm Quantum Dot Semiconductor Optical Amplifiers. - Yudai Okuno; Koki Sugiyama; Tadashi Hajikano; Yasunori Tomomatsu; Katsumi Yoshizawa; Hiroyuki Tsuda (PSC, 2018)