Abstract: This paper analyses the performance of the systems affected by the cross talk induced Stimulated Raman Scattering (SRS). SRS has very little impact on system performance for a single channel system, however, it is one of the major non-linear effects in the dense wavelength division multiplexed (DWDM) fiber optics communication systems. The effect of SRS causes power to be transferred from lower wavelength channels to higher wavelength channels. This unwanted Power tilt reduces the optical signal to noise ratio (OSNR) which in turn increases the Bit Error Rate (BER). SRS effect could be reduced by setting optimum power in the fiber. The analysis of SRS was performed by setting various power levels and channel spacing of individual channels in DWDM system in the sample mode of OptSim software to get the effects of SRS like power tilt in the optical spectrum. Power tilt was observed for different cases like unequal channel spacing, equal channel spacing and different input power are provided to the system. It was found that unequal channel spacing between channels reduced the unwanted power tilt value. When the Input power was decreased, there was reduction in the unwanted tilt in optical power. However by reducing the input power, number of channels in a DWDM system decreased. Hence Optimum power level settings in the fiber have to be set for DWDM. Therefore, to reduce the power tilt value, minimum Input power and unequal channel spacing is to be given for the individual channels.

Keywords: WDM, SRS, OptSim, OSNR, BER.