uPackage - A Package to Enable Do-It-Yourself Style Ubiquitous Services with Daily Objects. - Takuro Yonezawa; Hiroshi Sakakibara; Kengo Koizumi; Shingo Miyajima; Jin Nakazawa; Kazunori Takashio; Hideyuki Tokuda (UCS, 2007)

10Gbit/s photonic crystal fiber transmissions with 1.1µm directly-modulated single-mode VCSEL. - Kengo Koizumi; Masato Yoshida; Toshihiko Hirooka; Masataka Nakazawa (IEICE Electron. Express, 2009)

High-speed distributed strain measurement using brillouin optical time-domain reflectometry based-on self-delayed heterodyne detection. - Kengo Koizumi; Yoshihiro Kanda; Akihiro Fujii; Hitoshi Murai (ECOC, 2015)