Raman effects and four-wave mixing in a WDM soliton communication system with lumped amplifiers

The influence of SRS and four wave mixing (FWM) effects on the WDM soliton communication system with lumped amplifiers are studied, and the degradation characteristics of signal-to-noise ratio and bit-error rate are given. The numerical results show that the influence of SRS and FWM on the system depends very strongly on the soliton pulse width. The larger the pulse width is, the weaker the influence becomes. In order to reduce the influence of SRS and increase the capacity of the system a shorter channel spacing and relatively large pulse width is preferred.