Masataka Nakazawa (born 17 September 1952) is a Japanese researcher in optical communication engineering. He is adistinguished professor atTohoku University in Japan.[1] His pioneering work onerbium-doped fiber amplifier (EDFA) has made a significant contribution to the development of global long-distance, high-capacity optical fiber network.[1]
Masataka Nakazawa received B.S. in Electronics fromKanazawa University in 1975, M.S. in Physical Electronics fromTokyo Institute of Technology in 1977, and Ph.D. in Applied Electronics from Tokyo Institute of Technology in 1980.[1] After receiving a Ph. D. degree, he joined the Electrical Communication Laboratory ofNippon Telegraph & Telephone Public Corporation in 1980.[1] He was a visiting scientist atMassachusetts Institute of Technology in 1984.[1] In 1999, he became an NTT R&D Fellow.[1] Then, in 2001, he moved to theResearch Institute of Electrical Communication (RIEC) at Tohoku University. He became a distinguished professor (DP) in 2008 and the director of RIEC in 2010.[1] He also served as the director of Japan Council for Research Institutes and Centers of National Universities and of Research Organization of Electrical Communication (ROEC) in 2011.[1] Currently, he is a director of Kanazawa University (part time) and a specially appointed professor/ distinguished professor at the International Research Institute of Disaster Science at Tohoku University[1]
He introducederbium ions into optical communication in 1984, when he constructed the first erbium (Er3+):glass laser operating at 1.55 μm,[2] and then used it as anoptical time domain reflectometer (OTDR). This enabled a fault to be located in a 130 km-long single-mode fiber, which remains the world record distance.[3] He then began research on an erbium-dopedfiber laser in 1987[4] andamplifier in 1989.[5] After Dr.R. J. Mears ofProf. Payne’s group reported the firstEDFA in 1987,[6] Dr. Nakazawa used a1.48 μm InGaAsPlaser diode (LD) to pump the erbium fiber[5] and reported the highest gain of 46.5 dB in 1989[7] after employing the LD forRaman amplification at 1.55 μm in 1988.[8] He invented the LD pumped erbium-doped fiber amplifier (EDFA),[5] which made it possible to construct a compact, reliable, and low-power consumption optical repeater for high-speed, high-capacity, and long-distance optical communication systems. He also reportedbackward Raman amplification in 1984,[9] which remains in commercial use.
^Nakazawa, M.; Tokuda, M.; Washio, K.; Asahara, Y. (1984). "130-km long fault location for single-mode optical fiber using 1.55 μm Q-switched Er3+: glass laser".Optics Letters.9 (7):312–314.doi:10.1364/ol.9.000312.PMID19721581.
^Nakazawa, M.; Kimura, Y. (1987). "Simultaneous oscillation at 0.91, 1.08, 1.53 μm in a fusion-spliced fiber laser".Applied Physics Letters.51 (22):1768–1770.doi:10.1063/1.98516.
^abcNakazawa, M.; Kimura, Y.; Suzuki, K. (1989). "Efficient Er3+-doped optical fiber amplifier pumped by a 1.48 μm InGaAsP laser diode".Applied Physics Letters.54 (4):295–297.doi:10.1063/1.101448.
^Kimura, Y.; Suzuki, K.; Nakazawa, M. (1989). "46.5 dB gain in Er3+-doped fibre amplifier pumped by 1.48 μm GaInAsP laser diodes".Electronics Letters.25 (24):1656–1657.Bibcode:1989ElL....25.1656K.doi:10.1049/el:19891110.
^Nakazawa, M.; Tokuda, M.; Negishi, Y.; Uchida, N. (1984). "Active transmission line: Light amplification by backward stimulated Raman scattering in polarization-maintaining optical fiber".Journal of the Optical Society of America B.l (1):80–85.Bibcode:1984JOSAB...1...80N.doi:10.1364/JOSAB.1.000080.
^Nakazawa, M.; Yamamoto, T.; Tamura, K.R. (2000). "1.28 Tbit/s–70 km OTDM transmission using third- and fourth-order simultaneous dispersion compensation with a phase modulator".Electronics Letters.36 (24). IEE:2027–2029.Bibcode:2000ElL....36.2027N.doi:10.1049/el:20001391.
^Nakazawa, M.; Kimura, Y.; Suzuki, K. (1989). "Soliton amplification and transmission with Er3+-doped fibre repeater pumped by GaInAsP laser diode".Electronics Letters.25 (3):199–200.Bibcode:1989ElL....25..199N.doi:10.1049/el:19890143.
^Nakazawa, M.; Suzuki, K.; Kimura, Y. (1990). "3.2-5 Gb/s, 100 km error-free soliton transmission with erbium amplifiers and repeaters".IEEE Photonics Technology Letters.2 (3):216–219.Bibcode:1990IPTL....2..216N.doi:10.1109/68.50894.S2CID7735296.
^Nakazawa, M.; Yamada, E.; Kubota, H.; Suzuki, K. (1991). "10 Gbit/s soliton data transmission over one million kilometres".Electronics Letters.27 (14):1270–1272.Bibcode:1991ElL....27.1270N.doi:10.1049/el:19910796.
^Nakazawa, M.; Hirooka, T. (2005). "Distortion-free optical transmission using time-domain optical Fourier transformation and transform-limited optical pulses".Journal of the Optical Society of America B.22 (9):1842–1855.Bibcode:2005JOSAB..22.1842N.doi:10.1364/JOSAB.22.001842.
^Nakazawa, M.; Yoshida, E.; Kimura, Y. (1994). "Ultrastable harmonically and regeneratively modelocked polarisation-maintaining erbium fibre ring laser".Electronics Letters.30 (19):1603–1604.Bibcode:1994ElL....30.1603N.doi:10.1049/el:19941072.
^Kasai, K.; Yoshida, M.; Nakazawa, M. (September 2005). "Acetylene (13C2H2) stabilized single-polarization fiber laser".IEICE Trans. Electron. J88-C (9):708–715.
