Optical communications – Multiplex – Wavelength division or frequency division
Reexamination Certificate
2005-07-19
2008-12-16
Singh, Dalzid (Department: 2613)
Optical communications
Multiplex
Wavelength division or frequency division
C398S082000, C398S033000
Reexamination Certificate
active
07466921
ABSTRACT:
Disclosed is a drop-and-continue device (84), provided between a signal converter (85) which supplies a signal to an end user and a wavelength-division multiplexing device (83) which comprises an optical demultiplexer (831) for separating an optical signal of a desired wavelength from an optical signal supplied from a head end station (82) and an optical multiplexer (832) for supplying an optical signal to a wavelength-division multiplexing device at a subsequent stage, comprising: an optical receiver (841) which converts the optical signal separated by the optical demultiplexer into an electrical signal; a transmitter (844) which transmits the electrical signal to the end user via the signal converter (85); an optical transmitter (845) which supplies an optical signal to the optical multiplexer (832); and a loopback processor (842) which loops the electrical signal output from the optical receiver back to the optical transmitter, thereby providing a drop-and-continue device that can easily add capabilities best suited for video, voice, and entertainment distribution and other added value features onto a WDM device.
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patent: 2004/0042795 (2004-03-01), Doerr et al.
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patent: 4-167634 (1992-06-01), None
patent: 9-36834 (1997-02-01), None
patent: 2004-56685 (2004-02-01), None
Fujitsu Limited
Singh Dalzid
Staas & Halsey , LLP
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