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AssigneeLucent Technologies Inc.
InventorsDirk Bode, Bernd Teichmann, Jianhui Zhou
Estimating the term…
The present invention relates generally to the field of optical transmission and particularly to a method and a system for controlling optical amplification in wavelength division multiplex optical transmission. WDM systems currently under development will have eighty or more channels, i.e., modulated optical signals with different wavelengths (known as Dense Wavelength Division Multiplexing, DWDM). These DWDM systems are demanding optical amplifiers which, especially considering the cascadation of a plurality of optical amplifiers along the transmission path of the DWDM system, have only very limited tolerances in certain parameters. Among these parameters gain flatness and gain tilt are of special importance. The present invention discloses a method and a system which make use of auxiliary optical signals having a given power level which is equal for all auxiliary signals. Differences in the power levels of the auxiliary signals after optical amplification are used for the control of the optical amplifiers of the WDM system.
A method for controlling optical amplification of an optical transmission signal including a plurality of optical signals modulated with different wavelengths for wavelength division multiplex optical transmission, comprising the steps of:
A system for controlling optical amplification of an optical transmission signal consisting of a plurality of optical signals modulated with different wavelengths for wavelength division multiplex optical transmission, formed by at least one means for combining optical signals comprising:
Dependencies are inferred from the claim text.