Low-Loss and Highly Reliable Low-Profile Coupler for Silicon Photonics. - Tsutaru Kumagai; Tetsuya Nakanishi; Tetsuya Hayashi; Kenichiro Takahashi; Manabu Shiozaki; Atsushi Kataoka; Takashi Murakami; Tomomi Sano (OFC, 2019)

Glass Microspheres with Add-on Structures for Optical Resonators. - Tetsuo Kishi; Tsutaru Kumagai; Hengjie Tang; Shunsuke Murai; Gao Yuan; Francesco Prudenzano; Tetsuji Yano (ICTON, 2020)

2-Dimentional Fiber Array with Reflow Compatibility for High-Density Optical Interconnection. - Tsutaru Kumagai; Hajime Arao; Hong C. Nguyen; Tetsuya Nakanishi (OFC, 2020)