Abstract: The effects of nonlinear effects on the WDM system are presented here. Through the simulation of the DCF transmission system with different schemes, the optimized scheme of transmission link and input power is obtained. The results show that the transmission performance of mix-compensation is better than that of pre-compensation and post-compensation. The transmission performances of the various channels are compared.

Key words: wavelength division multiplexing(WDM), dispersion compensated fiber(DCF), self phase modulation(SPM), cross phase modulation(XPM), nonlinear effect