Wavelength control in optical WDM systems

Optical communications – Multiplex – Wavelength division or frequency division

Reexamination Certificate

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Details

C398S079000, C398S095000, C398S149000

Reexamination Certificate

active

06980742

ABSTRACT:
Wavelength drift in an optical WDM system between wavelengths launched by lasers (110) and received at a demultiplexer (50) can lead to disturbance of traffic signals if not identified and rectified rapidly. It is proposed to identify wavelength drift by determining a difference in temperature of the demultiplexer (50) for each channel between an actual temperature and a temperature for optimal transmission of the channel. The mean of these temperature differences for all channels is indicative of wavelength drift, while each difference is utilised to determine whether an individual channel is drifting in wavelength and to correct the drift. Wavelength drift can be detected and corrected whether sourced at a laser (110) or due to a temperature variation at the demultiplexer (50). Measurement and control can be performed during normal operation without impeding or degrading traffic flow. Wavelength influencing parameters other than temperature can be utilized.

REFERENCES:
patent: 5673129 (1997-09-01), Mizrahi
patent: 5793910 (1998-08-01), Derr
patent: 07 095159 (1995-04-01), None
patent: 07 162070 (1995-06-01), None
patent: 09-093223 (1997-04-01), None
patent: 09 093223 (1997-04-01), None
International Search Report relating to PCT/EP99/05630; Dated: Oct. 25, 2000.
Written Opinion relating to PCT/EP99/05630; Dated: May 9, 2000.
European Search Report relating to Priority Application EP 98115 369.5 for PCT/EP99/05630; Dated: Dec. 18, 1998.

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