Optical communications – Multiplex – Broadcast and distribution system
Reexamination Certificate
2008-01-15
2008-01-15
Pak, Sung (Department: 2874)
Optical communications
Multiplex
Broadcast and distribution system
C385S024000, C398S071000, C398S072000
Reexamination Certificate
active
11471152
ABSTRACT:
Disclosed is a wavelength-division-multiplexed passive optical network using a wavelength-locked optical transmitter. The wavelength-division-multiplexed passive optical network (WDM PON) includes a central office, which includes a plurality of downstream optical transmitters for outputting downstream optical signals having wavelengths according to downstream injection lights, a wavelength division multiplexer including a plurality of de-multiplexing ports linked to the plurality of the downstream optical transmitters by one-to-one, and a multiplexing port linked with the feeder fiber and performing wavelength division multiplexing and wavelength division de-multiplexing, and at least one optical switch interposed between the downstream optical transmitters and the de-multiplexing ports, inputting a downstream band light output from a selected downstream optical transmitter to the multiplexing port, and inputting a downstream optical signal output from a remaining downstream optical transmitter, which is not selected, to the de-multiplexing port.
REFERENCES:
patent: 6996138 (2006-02-01), Jung et al.
patent: 7167649 (2007-01-01), Song et al.
patent: 2005/0276603 (2005-12-01), Jung et al.
patent: 2005/0286895 (2005-12-01), Lee et al.
patent: 2006/0182445 (2006-08-01), Lee et al.
Hwang Seong-Taek
Kim Yong-Gyoo
Lee Jae-Hoon
Oh Yun-Je
Cha & Reiter LLC
Pak Sung
Smith Chad H.
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