Optical communications – Transmitter – Having particular modulation
Reexamination Certificate
2006-08-29
2009-06-23
Sedighian, M. R. (Department: 2613)
Optical communications
Transmitter
Having particular modulation
C398S198000, C398S032000
Reexamination Certificate
active
07551858
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.
REFERENCES:
patent: 4747095 (1988-05-01), Crookshanks
patent: 5216417 (1993-06-01), Honda
patent: 5513029 (1996-04-01), Roberts
patent: 5745274 (1998-04-01), Fatehi et al.
patent: 5959749 (1999-09-01), Danagher
patent: 5974094 (1999-10-01), Fines
patent: 6078412 (2000-06-01), Fuse
patent: 6101012 (2000-08-01), Danagher
patent: 7158723 (2007-01-01), Wan et al.
patent: 2003/0002118 (2003-01-01), Givehchi
patent: 2003/0067646 (2003-04-01), Wan
patent: 2003/0067647 (2003-04-01), Wan
patent: 2003/0067651 (2003-04-01), Wan
patent: 2004/0062548 (2004-04-01), Obeda
patent: 2004/0062549 (2004-04-01), Obeda
patent: 99/33200 (1999-07-01), None
Hill, G.R., et al, “A Transport Network Layer Based on Optical Network Elements”, Journal of Lightwave Technology, IEEE, New York, USA, vol. 11, No. 5/6, May 1, 1993, pp. 667-676.
Richard G. Lyons, “Understanding Digital Signal Processing”, published by Addison-Wesley Publishing Company, Copyright 1997, pp. 319-349.
Fred Heisman et al, “Signal Tracking and Performance Monitoring in Multi-Wavelength Optical Networks”, WeB 2.2, 22.sup.nd European Conference on Optical Communication-ECOC'96, Oslo, pp. 3.47-3.50.
Chimfwembe Patrick Chilufya
Remedios Derrick
Wan Ping Wai
Alcatel-Lucent Canada Inc.
Donnelly Victoria
Sedighian M. R.
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