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Optical ring network
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Patent number 10,044,462
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Issue date Aug 7, 2018
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Alcatel Lucent
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Guilhem De Valicourt
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Light receiving device
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Patent number 9,923,642
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Issue date Mar 20, 2018
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Mitsubishi Electric Corporation
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Satoshi Shirai
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H03 - BASIC ELECTRONIC CIRCUITRY
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Optical communication system
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Patent number 5,214,524
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Issue date May 25, 1993
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Sumitomo Electric Industries, Ltd.
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Masayuki Shigematsu
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H04 - ELECTRIC COMMUNICATION TECHNIQUE