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Optical transmitter
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Patent number 12,170,542
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Issue date Dec 17, 2024
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Nippon Telegraph and Telephone Corporation
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Hiroto Kawakami
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Light amplifying relay system
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Patent number 12,034,269
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Issue date Jul 9, 2024
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Nippon Telegraph and Telephone Corporation
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Takayuki Mizuno
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H01 - BASIC ELECTRIC ELEMENTS
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Multimode optical amplifier
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Patent number 11,888,281
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Issue date Jan 30, 2024
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Nippon Telegraph and Telephone Corporation
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Hirotaka Ono
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H01 - BASIC ELECTRIC ELEMENTS
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Optical repeater
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Patent number 11,438,071
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Issue date Sep 6, 2022
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Nippon Telegraph and Telephone Corporation
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Hirotaka Ono
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Signal generation device
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Patent number 11,438,083
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Issue date Sep 6, 2022
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Nippon Telegraph and Telephone Corporation
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Hiroshi Yamazaki
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Optical node device
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Patent number 11,362,753
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Issue date Jun 14, 2022
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Nippon Telegraph and Telephone Corporation
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Hirotaka Ono
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H01 - BASIC ELECTRIC ELEMENTS
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Crosstalk estimation system
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Patent number 11,349,564
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Issue date May 31, 2022
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Nippon Telegraph and Telephone Corporation
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Akira Isoda
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Optical modulator
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Patent number 11,194,219
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Issue date Dec 7, 2021
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Nippon Telegraph and Telephone Corporation
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Hiroto Kawakami
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G02 - OPTICS
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Optical node device
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Patent number 10,965,375
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Issue date Mar 30, 2021
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Nippon Telegraph and Telephone Corporation
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Hirotaka Ono
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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