Optical communications – Multiplex – Wavelength division or frequency division
Reexamination Certificate
2005-12-27
2005-12-27
Sedighian, M. R. (Department: 2633)
Optical communications
Multiplex
Wavelength division or frequency division
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.
Lidén Fredrik
Öberg Magnus
Burleigh Roger
Sedighian M. R.
Telefonaktiebolaget LM Ericsson (publ)
LandOfFree
Wavelength control in optical WDM systems does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Wavelength control in optical WDM systems, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Wavelength control in optical WDM systems will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3511921