Optical communications – Diagnostic testing – Determination of communication parameter
Reexamination Certificate
2011-01-11
2011-01-11
Sedighian, M. R. (Department: 2613)
Optical communications
Diagnostic testing
Determination of communication parameter
C398S183000, C398S186000, C398S198000
Reexamination Certificate
active
07869709
ABSTRACT:
Signals in an optical communications network, such as optical channels in an optical WDM network for example, are each identified by at least two low frequency dither tones with which the signal is modulated. The dither tones alternate with a predetermined periodicity to produce a cyclically repeated sequence of dither tones. A network parameter, such as a channel identifier for example, is obtained by the detection of the particular combination of dither tones in the sequence. To detect a number of network parameters a signal is modulated with a number of cyclically repeated sequences of dither tones each uniquely identifying a respective network parameter. In some implementations each dither tone in a cyclically repeated sequence of dither tones is repeated with substantially the same phase and coherent averaging is performed over a number of periods to detect dither tones on low power signals.
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Chimfwembe Patrick Chilufya
Remedios Derrick
Wan Ping Wai
Alcatel-Lucent Canada Inc.
Donnelly Victoria
IP-Mex Inc.
Sedighian M. R.
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