Method and apparatus for a supervisory channel in a WDM...

Details Method and apparatus for a supervisory channel in a WDM... Method and apparatus for a supervisory channel in a WDM...

2004-12-30

2009-06-02

Vanderpuye, Ken N (Department: 2613)

Optical communications

Multiplex

Wavelength division or frequency division

C398S030000, C398S031000, C398S032000, C398S082000, C398S186000, C398S187000, C398S188000

Reexamination Certificate

active

07542678

ABSTRACT:
A method and apparatus for providing a supervisory channel in a wavelength division multiplexing (WDM) fiber-optic communication system uses a controlled optical attenuator disposed in an optical path between a demultiplexer (DMUX) and a multiplexer (MUX) of an Optical Add-Drop Multiplexer (OADM.

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patent: 2002/0031324 (2002-03-01), Cao et al.
patent: 2003/0095736 (2003-05-01), Kish et al.
patent: 2005/0089325 (2005-04-01), Shan
Ramaswami and Sivarajan, “Optical Networks, a Practical Perspective”, 1998, Morgan Kaufman Publishers, pp. 336-337.

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