He received the B.E. and M.E. degrees in electronic engineering from Utsunomiya University in 1988 and 1990, respectively, and received the Ph. D. degree in information science and technology from Hokkaido University in 2009. In 1990, he joined NTT laboratories, where he has been working on research and development of optical communication systems including passive optical network (PON) based optical access systems. His current research interests are 10G-EPON systems/technologies and optical-amplifier-based long-reach PON systems/technologies. Since 2006, he is an IEEE 802.3 working group voter and has been working for creating 10G-EPON and related standardization in IEEE 802.3av task force and IEEE P1904.1 working group. He is an executive secretary of IEEE P1904.1 working group since 2010, an associate editor of IEICE Transaction on Communications since 2007, and a member of the Technical Committee on Communication Systems in IEICE Communication Society since 2008. He is a member of the Institute of Electrical and Electronics Engineers (IEEE), the Institute of Electronics, the Information and Communication Engineers (IEICE) of Japan, and Optical Society of America (OSA).