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Since joining NTT Electrical Communications Laboratories, Dr. Nakazawa has been engaged in groundbreaking R&D related to optical fibers and ultrahigh-speed optical transmission systems. Among his many achievements, the most noteworthy was the invention (based on his creative concept) and commercial development of the erbium-doped optical fiber amplifier (EDFA), which caused a revolution in optical fiber communication. Using this EDFA, he greatly boosted the performance of optical soliton transmission, ultrahigh-speed fiber lasers, ultrashort pulse transmission, and digital coherent transmission, paving the way for high-capacity optical transmission. This was a major contribution to the development of the information society. The EDFA’s ability to amplify multi-wavelength optical signals simultaneously has led to its use in expanding the communication capacity of wavelength-division multiplexing. EDFAs support today’s global information and communication networks from terrestrial high-capacity optical transmission systems to transoceanic high-capacity submarine cable systems.
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OPTICS EXPRESSno. 7 (2024): 12682-12707
IEEE Journal of Quantum Electronicsno. 6 (2023): 1-16
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IEICE TRANSACTIONS ON COMMUNICATIONSno. 11 (2023): 1059-1064
Journal of Lightwave Technologyno. 11 (2023): 3358-3371
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Springer Series in Optical Sciences Space-Division Multiplexing in Optical Communication Systemspp.257-368, (2022)
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