Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1997-12-19
2000-03-21
Chan, Jason
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
359133, 359110, 359161, 359187, H04B 1400, H04B 1008
Patent
active
060409339
ABSTRACT:
A method and apparatus for channel performance equalization in wavelength division multiplexed (WDM) systems is disclosed. Performance of the channels is estimated from optical power measurements of each signal transmitted by the channels. The measurements are taken at the inputs of optical amplifiers in the transmission path of the system. The channels are equalized by adjusting the optical power of the channel transmitters. The method is applicable to point-to-point networks as well as more complex network configurations such as those having an add-drop multiplexer (ADM) for inserting and extracting channels from the transmission path. The method can compensate for signals having different bit rates by applying an offset to the amount of optical power adjustment of the channel transmitters. Furthermore, if different types of optical amplifiers are used in the transmission path, the method can accommodate different noise characteristics of the amplifiers by using their noise figures in determining the amount of optical power adjustment of the transmitters that is required to equalize channel performance.
REFERENCES:
patent: 5225922 (1993-07-01), Chraplyvy et al.
patent: 5745275 (1998-04-01), Giles et al.
Barnard Chris Wilhelm
Khaleghi Farideh
Solheim Alan Glen
Bello Agustin
Chan Jason
Nortel Networks Corporation
Smith Dallas F.
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