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Effect of Modulation Statistics on Raman Crosstalk in WDM Systems

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The performance of wavelength-division-multiplexed (WDM) optical communication systems might be ultimately limited by stimulated-Raman-scattering (SRS) crosstalk [1]. The effect of SRS crosstalk has been analysed in the literature by computing the depletion of the shortest wavelength channel (the most depleted) in the worst-case assumption that the peak optical power is transmitted in each channel [2], [3], [4], While this is correct for FSK and PSK systems, in the case of intensity modulation the probability that a symbol “1” is simultaneously transmitted on all channels decreases when the number of channels is increased. For example in a 100-channel system this probability is 10−30. It is therefore important to compute the SRS depletion considering the statistics of the modulated signals. It is shown here that for a large number of channels the actual penalty is given by half the value predicted with the worst-case analysis and corresponds to what would have been found considering all channels CW but carrying the average power instead of the peak power.

© 1994 Optical Society of America

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