Optical communications – Multiplex – Wavelength division or frequency division
Reexamination Certificate
2007-10-09
2007-10-09
Singh, Dalzid (Department: 2613)
Optical communications
Multiplex
Wavelength division or frequency division
C398S038000, C398S095000, C398S159000, C398S147000, C398S197000
Reexamination Certificate
active
10671794
ABSTRACT:
An optical transmission system capable of transmitting with high quality all the component signals of a signal lightwave having a broad total wavelength band and particularly suitable for the CWDM optical transmission, and an optical multiplexer and an optical demultiplexer for the system. Component signals outputted from optical transmitters are combined by an optical multiplexer, travel over an optical fiber transmission line, and arrive at an optical demultiplexer to be separated. They are received by optical receivers. The total transmission loss in the transmission line is smaller at wavelength λbthan at wavelength λa. The insertion loss of the optical multiplexer or the optical receiver is larger at wavelength λbthan at wavelength λa. The difference in power between the component signals having wavelengths λaand λbarriving at the optical receivers is smaller than the difference in the total transmission loss in the transmission line between wavelengths λaand λb.
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JP Office Action issued in Patent Appln. No. 2002-309852, dated Jun. 5, 2007 with English translation.
McDermott Will & Emery LLP
Singh Dalzid
Sumitomo Electric Industries Ltd.
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