Optical communications – Diagnostic testing – Determination of communication parameter
Reexamination Certificate
2008-06-30
2011-12-13
Pascal, Leslie (Department: 2613)
Optical communications
Diagnostic testing
Determination of communication parameter
C398S034000, C398S083000
Reexamination Certificate
active
08078054
ABSTRACT:
For wavelength division multiplexing (WDM) communications, apparatus and methods are provided for performing tone-based optical channel monitoring that is less sensitive to stimulated Raman scattering (SRS). In tone-based optical channel monitoring, in which WDM channels are modulated with one or more tones, detecting and measuring the tone power is commonly used as a measure of signal power in each channel. In WDM systems with long fiber spans and high signal powers, however, SRS tends to transfer energy from shorter wavelengths to longer wavelengths, whereby the tones are no longer accurately indicative of the signal power of the individual wavelength channels. Apparatus and methods are provided which reduce the effect of SRS by filtering the monitored WDM signals into sub-bands and detecting each sub-band independently.
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Jiang Song
Kelly Colin
Liu Xiang
Remedios Derrick
Alcatel Lucent
Brosemer, Kolefas & Associates LLC
Pascal Leslie
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