Method and system for selective optical payload cancellation

Details Method and system for selective optical payload cancellation Method and system for selective optical payload cancellation

2007-05-29

2007-05-29

Pascal, Leslie (Department: 2613)

Optical communications

Transmitter

Including compensation

C359S249000

Reexamination Certificate

active

10635561

ABSTRACT:
The invention provides a method and system for selectively canceling a specified frequency band in the payload of an optical communication system. This selected frequency band is to be used for launching pilot tones for power measurement and identification. The method controls the intensity of the optical payload signal through an intensity modulator that is included in the optical communication system. The frequency band in payload to be cancelled is removed where as the other frequency components of the payload are passed without attenuation. An embodiment that uses a feed-forward unit, a feedback unit and a control unit for generating a cancellation signal for the intensity modulator is described. An advantage of the method is that it removes a continuum of payload tones in the specified frequency band to be cancelled.

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