Optical communications – Multiplex – Wavelength division or frequency division
Reexamination Certificate
2006-02-14
2006-02-14
Sedighian, M. R. (Department: 2633)
Optical communications
Multiplex
Wavelength division or frequency division
C398S079000, C398S149000, C398S158000, C385S015000, C385S027000
Reexamination Certificate
active
06999683
ABSTRACT:
A wavelength division multiplex optical system includes a WDM combiner to provide a source signal, at least one transmitter coupled to an input of the WDM combiner, a broadband noise source, and a filter coupled between the broadband noise source and another input of the WDM combiner. In one embodiment, the filter is an optical notch filter. In an alternative embodiment, the filter includes a WDM demultiplexer coupled through plural filters to provide a plurality of noise signals and a WDM multiplexer coupled through at least one filter of the plural filters to respective noise signals.
REFERENCES:
patent: 4945531 (1990-07-01), Suzuki
patent: 5726784 (1998-03-01), Alexander et al.
patent: 6256138 (2001-07-01), Huang
patent: 6704511 (2004-03-01), Kerfoot et al.
Kerfoot, III Franklin W.
Ma Matthew X.
Schlosser Wolfgang
Tremblay Mark D.
Grossman Tucker Perreault & Pfleger PLLC
Sedighian M. R.
Tyco Telecommunications (US) Inc.
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