Yasuharu Suematsu

Japanese scientist

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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.

## Life

[edit]

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]

## Research

[edit]

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]

Fig.1. Replica of the earliest demonstration of optical fiber communication experiment, on May 26, 1963, restored in 2008-7.[clarification needed] (Registered as Future Technology Heritage, at the National Museum of Science, Japan). By courtesy of the Museum of Tokyo Institute of Technology.

## Social contribution by research

[edit]

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.

## See also

[edit]

* 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.

## References

[edit]

1. ^ a b c d e f g h i j k l The Japan Prize Foundation: Dr. Yasuharu Suematsu. Dated 2014, Archived copy at archive.org
2. ^ a b IEEE James H. Mulligan, Jr. Education Medal Recipients, Archived copy at archive.org
3. ^ a b c d e f Nakata, Y.; Asada, M.; Suematsu, Y. (September 1986). "Analysis of novel resonant electron transfer triode device using metal-insulator superlattice for high speed response". IEEE Journal of Quantum Electronics. QE-22 (9): 1880–1886\. Bibcode:1986IJQE...22.1880N. doi:10.1109/JQE.1986.1073178.
4. ^ Yoshihisa Yamamoto: Curriculum Vitae. Dated January 2005. Original at stanford.edu Archived July 18, 2010, at the Wayback Machine,
5. ^ Kochi University of Technology: Congratulating Professor Emeritus Yasuharu Suematsu on winning the Japan Prize. Dated January 31, 2014, Archived copy at archive.org
6. ^ "Dr. Yasuharu Suematsu". 500 Fifth Street, NW Washington, DC: National Academy of Engineering. January 18, 2025.`{{cite web}}`: CS1 maint: location (link) CS1 maint: url-status (link)
7. ^ "Yasuharu Suematsu | Optica". www.optica.org. Retrieved 2025-04-01.
8. ^ The Japan Prize Foundation: Pioneering research on semiconductor lasers for high-capacity, long-distance optical fiber communication, Archived copy at archive.org
9. ^ Suematsu, Yasuharu (2014-03-15). "Dynamic Single-Mode Lasers". Journal of Lightwave Technology. 32 (6): 1144–1158\. Bibcode:2014JLwT...32.1144S. doi:10.1109/JLT.2013.2293817. S2CID 31634729.

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IEEE James H. Mulligan Jr. Education Medal

1956–1975|

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2001–present|

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* Shun-ichi Iwasaki / Peter Vitousek (2010)
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* Janet Rowley / Brian Druker / Nicholas Lydon / Masato Sagawa (2012)
* C. Grant Willson / Jean Fréchet / John Frederick Grassle (2013)
* Yasuharu Suematsu / C. David Allis (2014)
* Yutaka Takahasi / Theodore Friedmann / Alain Fischer (2015)
* Hideo Hosono / Steven D. Tanksley (2016)
* Emmanuelle Charpentier / Jennifer Doudna / Adi Shamir (2017)
* Akira Yoshino / Max Dale Cooper / Jacques Miller (2018)
* Yoshio Okamoto / Rattan Lal (2019)

2020s|

* Robert G. Gallager / Svante Pääbo (2020)
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* Masataka Nakazawa / Kazuo Hagimoto / Gero Miesenböck / Karl Deisseroth (2023)
* Brian Hoskins / John Michael Wallace / Ronald M. Evans (2024)

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