Yasuharu Suematsu

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Yasuharu Suematsu
Suematsu in 2006
Born	September 22, 1932 (1932-09-22) (age 92)[1][3] Gifu, Japan[3]
Nationality	Japanese[1]
Alma mater	Tokyo Institute of Technology[1][3]
Known for	Contributing to the development of optical fiber communication
Awards	2015 The Order of Culture, from the Emperor of Japan. 2014 Japan Prize[1] 2003 IEEE James H. Mulligan Jr. Education Medal[1][2] 1996 Medal of Honour with Purple Ribbon[1] 1994 C&C Prize[1] 1994 John Tyndall Award[1] 1986 IEEE David Sarnoff Award[1]
Scientific career
Fields	Optical communications[3]
Notable students	Yoshihisa Yamamoto[4]

Yasuharu Suematsu (末松 安晴, Suematsu Yasuharu, born September 22, 1932) is a Japanese electrical engineer. His work has contributed to developments in optical fiber communication technology. His research on dynamic single-mode lasers has been cited in several academic and technical studies. Suematsu holds the position of professor emeritus at the Institute of Science Tokyo.

Yasuharu Suematsu was born on September 22, 1932, in Gifu, Japan.^[3] He received his B.S. (1955) and Ph.D. (1960) from the Tokyo Institute of Technology.^[1][3] Afterward, he joined the faculty of the Tokyo Institute of Technology as a professor. In 1989, he was appointed President of the University^[1] until 1993 when he became the inaugural^[5] President of Kochi University of Technology and also served as Director General^[1] of the National Institute of Informatics. During the same year, he was elected a member of the National Academy of Engineering (US) with the citation "For contributions to the understanding and development of optical fibers, high-performance semiconductor lasers, and integrated optoelectronics".^[6]

He is a Foreign Associate of the National Academy of Engineering, a Foreign Member of the National Academy of Engineering of Korea, an Optica Fellow, and a Fellow of the Institute of Electrical and Electronics Engineers.^[7]

He has authored 19 books and more than 260 scientific papers.^[2]

Professor Suematsu is best known for his contributions to the development of optical fiber communication. He developed semiconductor lasers which, even under high-speed modulation, produce light at a stable wavelength that coincides with the wavelength region where the optical losses of fibers reach their minimum.^[8]

Optical fiber communications make up a highly dense communications network circling the globe tens of thousands of times and are also used in applications such as middle-distance ethernets. Additionally, dynamic single-mode lasers^[9] in the band of 1.5 micrometers are used for optical lines from the exchange to the home in Fiber To The Home (FTTH) applications. The transmission performance of fiber represented a byproduct of the transmission capacity, and the distance has been increased exponentially yearly, as shown in Fig. 1.

• Distributed-feedback laser  – Critical structure Suematsu refined for stable single-mode operation.
• Charles K. Kao – "Father of Fiber Optics". Suematsu’s work realized practical lasers for Kao’s vision.
• History of telecommunication – Suematsu’s role in the fiber-optic revolution.

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