Optical communications – Multiplex – Wavelength division or frequency division
Reexamination Certificate
2006-11-21
2006-11-21
Pascal, Leslie (Department: 2613)
Optical communications
Multiplex
Wavelength division or frequency division
C398S032000, C398S034000
Reexamination Certificate
active
07139486
ABSTRACT:
An optical add/drop multiplexing (OADM) apparatus and method are disclosed for detecting pilot tones, removing ghost tones, and re-inserting pilot tones on WDM signals in an optical network. The OADM apparatus comprises a smart processing and control unit (PCU) for detecting pilot tones used for channel identifications, including identifying and removing ghost tones associated with respective optical channels, and re-inserting the processed pilot tones into the respective optical channels. The OADM apparatus and method may incorporate digital PCU or analog PCU for processing pilot tones and removing ghost tones.
REFERENCES:
patent: 7079764 (2006-07-01), Saunders
Chung, et al, “Effects of Stimulated Raman Scattering on Pilot-Tone Based WDM Supervisory Technique”, IEEE Photon. Technical Letter, Vol. 12, pp. 731-733, Jun. 2000.
Hill, et al, “A Transport Network Layer Based on Optical Network Elements”, IEEE Journal of Lightwave Technology, vol. 11, No. 5/6, pp. 667-679, May/Jun. 1993.
Chimfwembe Patrick Chilufya
Oprea Dan
Remedios Derrick
Wan Ping Wai
Donnelly Victoria
Pascal Leslie
Tropic Networks Inc.
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