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research and development of optical fiber, optical devices, modulation schemes, and the like. Phase shift distributed feedback lasers developed by this research have been commercially applied for long distances—for overland trunk systems (1987) and for intercontinental submarine cables (1992) (Fig. 8) —and continue to support the progress of the
Internet to this day. Later, since around 2004, wavelength tunable lasers are being used as the light source to advance dense wavelength division multiplexing (D-WDM) systems and optical coherent fiber systems for multi-level modulation schemes. 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, DSM lasers in the band of 1.5 micrometers are used for optical lines from the exchange centre to the home in FTTH. The transmission performance of fiber represented a by-product of the transmission capacity, and the distance has been increased yearly exponentially, as shown in Fig. 9. In such ways, the information transmission capability of optical fiber has reached several hundred thousand times as much as the coaxial cables preceding them and has significantly lowered the cost of transmitting the information. Reflecting this, the mid-1990s saw the network industry such as Yahoo, Google, and Rakuten appear one after the other. Optical fiber communications have progressed and the Internet has developed, and instantaneous transmission of a large volume of knowledge is now a daily occurrence. In 2018, the Internet population reached 39 billion, 52% of the world population. In the electrical communication era of the 1960s, large volumes of data, such as documents on which civilization depend, were circulated slowly in forms such as books. In contrast, the proliferation of high-capacity and long-distance optical fiber communications has allowed for large-volume information such as books to become used interactively in an instant. The research of optical fiber communications contributed to the rapid transition to a civilization based on the information and communications technology.
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meantime, Suematsu pioneered materials for a mixed crystal of GaInAsP/InP for a semiconductor laser that would operate at a wavelength band of 1.5 micrometres—which causes minimal loss inside the optical fiber as Donald A. Keck et al. suggested in 1973— and continuously operates at room temperature, in July 1979. Following these preliminary achievements, Suematsu and his co-workers succeeded in creating an integrated laser with built-in distributed reflectors using a material in the band of 1.5 micrometres. In
October 1980, Suematsu and his students built a dynamic single-mode laser that stably operates at a single mode even under rapid direct modulation (Fig.3 and Fig.4), and continuously operates at room temperature. This laser remained in stable operation mode even when the temperature was changed so that the wavelength could be tuned thermally within the 1.5 micrometres band. Thus, the thermo-tunable dynamic single-mode laser was born and triggered to develop a 1.5-micrometer high-speed fiber system, as cited by such as the 1983 Valdemar Poulsen Gold Medal, the Danish history of optical communication, and the 1986 David Sarnoff Award. Its spectral behaviour was investigated profoundly to attain full single-mode operation. Meanwhile, research and development progressed in industries in areas such as optical fibers, optical circuits, optical devices, modulation schemes, and system structures. The actualization of the dynamic single-mode laser became an impetus to develop high-capacity and long-distance optical fiber communications, and it began to be applied commercially at the end of the 1980s.
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increased by the introduction of distributed reflectors with multi-grating pitches by Yuichi
Tohmori and Yuhzou Yoshikuni, and Larry Coldren. The electro-tunable dynamic single-mode laser is especially important because it could be finely tuneable and also monolithically integrable together with other photonic devices which need the specific thermal tuning separately in the form of PICs (Photonic Integrated Circuits). It was around 2004, through the efforts of those involved, that this wavelength tuneable laser was developed and used commercially in dense wavelength division multiplexing (D-WDM) systems and optical coherent systems. It became utilized in earnest around 2010.
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Among these, the phase-shift distributed feedback (DFB) laser that
Suematsu and his students proposed in 1974 and demonstrated with Kazuhito Furuya in November 1983 (Fig.5) is a thermo-tunable dynamic single-mode laser which had a high rate of production yield, as cited by the 1985 Electronics Letter
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First, in 1972–1974, Suematsu and his student proposed a single mode resonator that would consist of a refractive index waveguide for the transverse mode, and two distributed reflectors joined together with a phase shift by odd numbers of a half π for the axial single mode operation (Fig.2) . In the
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The light source was a helium-neon gas laser, the modulator was hand made modulator by use of ADP crystal, applied signal voice voltage of 1.200 volts, for polarization rotation in response to the voice signal, the optical bundle glass fiber for the transmission medium, and the photomultiplier tube
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Light is the highest frequency of electromagnetic waves that humans can control. It outperforms radio waves by a wide margin in transmitting a large capacity of information. Research into optical communications was undertaken such as in the U.S.A., Japan, and
England. The nature of optical fiber
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High-capacity and long-distance optical fiber communications in the lowest loss wavelength band of 1.5 micrometres use dynamic single mode lasers (DSM lasers), such as phase shift distributed feedback lasers and wavelength tunable lasers, as their light sources, and have progressed along with
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On the other hand, the electro-tunable dynamic single-mode laser, which would be a goal of the
Dynamic Single Mode Laser, is, a so-called, wavelength tuneable laser that was proposed by Suematsu and his students in 1980 (Fig.7) and demonstrated in 1983. Later, the tuning wavelength range was
346:(born in 1932) is a researcher and educator in optical communication technology. His research has included the development of Dynamic Single Mode Semiconductor Lasers for actuation and the development of high-capacity, long-distance optical fiber communications technology.
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communication was thought possibly be able to transmit a large capacity of information over a long distance, all over the world. To make it a reality, the focus was on creating a
Dynamic Single Mode laser (DSM laser) (Fig.2) which has the following three characteristics:
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Premium Award, IEE, UK. Since the beginning of the 1990s, it had been consistently and widely used commercially as a standard laser for long-distance use, as awarded the 1994 C&C Prize. Often, a laser array is used to cover wide wavelength regions (Fig.6).
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Fig.1. Replica of the earliest demonstration of optical fiber communication experiment, on May 26, 1963, restored in 2008-7. (Registered as Future
Technology Heritage, at the National Museum of Science, Japan). By courtesy of the Museum of Tokyo Institute of
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for the detector. The original ADP reserved in the desiccator as well as the replica of that experiment, restored in 2008-7 as shown in Fig.1, was registered as a Future
Technology Heritage, at the National Museum of Science, Japan, in 2019.
445:(1) operates at a wavelength band that causes minimal loss within the optical fiber to allow for long-distance transmission (1.5 micrometres was discovered to be the ideal wavelength band during the course of the following research);
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The earliest demonstration of optical fiber communication was performed by
Suematsu and his students, on May 26, 1963, on the occasion of the open house of the Tokyo Institute of Technology (Fig.1).
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Fig.3. Laser tip on the mount of the first demonstration of dynamic single mode laser at a wavelength of 1.5 micrometers, in October 1980. By courtesy of the Museum of Tokyo Institute of Technology.
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448:(2) operates stably at a single wavelength to surmount the problem of transmission capacity reduction due to dispersion on the propagation constant in single-mode optical fiber; and
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Fig.2. Principle of Single-mode resonator consisted of two distrusted reflectors connected with phase shift of integer multiple of Î /2, for Dynamic Single Mode (DSM) Lasers, in 1974.
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Nakata, Y.; Asada, M.; Suematsu, Y. (September 1986). "Analysis of novel resonant electron transfer triode device using metal-insulator superlattice for high speed response".
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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.
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Please remove or replace such wording and instead of making proclamations about a subject's importance, use facts and attribution to demonstrate that importance.
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Fig.4. Single-mode property and schematic structure of the first demonstration of dynamic single mode laser at wavelength of 1.5 micrometers, in October 1980.
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for contributions to the understanding and development of optical fibers, high-performance semiconductor lasers, and integrated optoelectronics.
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Fig.6. A commercial phase shift distributed reflector laser array, with 100\ coin for size reference. By courtesy of Furukawa Electric Co.
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Fig.5 Schematic structure of Phase-Shift Distribute Feedback laser, in October 1983 ~Thermo-tunable Dynamic Singlr Mode Laser ~.
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Yasuharu Suematsu was born on September 22, 1932, in Gifu, Japan. He received both his B.S. (1955) and Ph.D. (1960) from the
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Fig.7. Schematic structure of Wavelength Tunable Laser ~ Electro, in 1980 ~Electro-tunable Dynamic Single Mode Laser ~.
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Pioneering research on semiconductor lasers for high-capacity, long-distance optical fiber communication
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Fig.9. Transmission performance of communication fiber. Prime data by Courtesy of NTT & KDDI.
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451:(3) allows the wavelength to be tuned to adapt to communication in multiple wavelengths.
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Congratulating Professor Emeritus Yasuharu Suematsu on winning the Japan Prize.
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Fig.8. International submarine cables around the world. By courtesy of KDDI.
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Professor Suematsu is best known for his contributions to the development of
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He has authored at least 19 books and more than 260 scientific papers.
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The Earliest Demonstration of Optical Fiber Communication Experiment
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Yoshihisa Yamamoto: Curriculum Vitae. Dated January 2005.
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IEEE James H. Mulligan, Jr. Education Medal Recipients
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2015 The Order of Culture, from the Emperor of Japan.
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53:Learn how and when to remove these messages
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366:. In 1993, he was elected a member of the
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139:. Please do not remove this message until
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135:Relevant discussion may be found on the
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483:Phase-Shift Distributed Feedback Laser
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608:IEEE Journal of Quantum Electronics
250:contributing to the development of
73:This article contains wording that
1847:Recipients of the Order of Culture
276:Medal of Honour with Purple Ribbon
205:Portrait of Yasuharu SUEMATSU-2006
78:without imparting real information
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689:Suematsu, Yasuharu (2014-03-15).
364:National Institute of Informatics
34:This article has multiple issues.
656:Kochi University of Technology:
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1643:/ John Frederick Grassle (2013)
697:Journal of Lightwave Technology
517:Social Contribution by Research
368:National Academy of Engineering
42:or discuss these issues on the
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1353:Ernest John Christopher Polge
356:Tokyo Institute of Technology
242:Tokyo Institute of Technology
692:"Dynamic Single-Mode Lasers"
678:Archived copy at archive.org
672:The Japan Prize Foundation:
662:Archived copy at archive.org
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141:conditions to do so are met
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660:Dated January 31, 2014,
638:Original at stanford.edu
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610:. QE-22 (9): 1880–1886.
292:IEEE David Sarnoff Award
1510:/ Keith J. Sainsbury /
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1619:Janet Rowley
1601:Ken Thompson
1518:Makoto Nagao
1480:Anne McLaren
1421:Jozef Schell
1349:Gerhard Ertl
1343:John J. Wild
1329:Dan McKenzie
1294:Robert Gallo
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36:Please help
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1817:1932 births
1542:Albert Fert
1498:Seiji Ogawa
1359:Frank Press
1225:Japan Prize
949:King-Sun Fu
919:Robert Fano
806:Ernst Weber
397:Technology.
266:Japan Prize
231:Nationality
225:Gifu, Japan
1806:Categories
1713:Rattan Lal
1689:Adi Shamir
1536:Akira Endo
1456:Ian McHarg
1403:Bruce Ames
1282:Isao Arita
1227:recipients
1134:Raj Mittra
1128:Randy Katz
1033:Adel Sedra
526:References
218:1932-09-22
149:April 2020
126:neutrality
88:April 2020
39:improve it
1556:Vint Cerf
1417:Leo Esaki
1393:Masao Ito
906:1976–2000
775:1956–1975
350:Biography
137:talk page
45:talk page
725:31634729
641:Archived
377:Research
234:Japanese
130:disputed
705:Bibcode
612:Bibcode
216: (
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1256:(1986)
1246:(1985)
1184:(2019)
1178:(2018)
1172:(2017)
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784:(1956)
723:
305:Fields
258:Awards
1723:2020s
1584:2010s
1449:2000s
1314:1990s
1233:1980s
721:S2CID
335:末松 安晴
290:1986
284:1994
279:1994
274:1996
269:2003
264:2014
765:IEEE
211:Born
123:The
713:doi
620:doi
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