Mitigation of FWM in the Fiber Optic DWDM System by using Different Modulation Techniques and Optical Filters

To increase the transmission capacity of the fibers, it require high launching power and the minimum channel spacing. So nowadays, a novel technology called DWDM (Dense Wavelength Division Multiplexing) is deployed. However, to decrease the spacing and to increase the number of channels, there is a nonlinear distortion like Four-Wave Mixing that reduces the transmitted signal and therefore the overall system performance. In this paper, various modulation techniques and optical filters have been considered to mitigate Four-Wave Mixing (FWM) in Dense wavelength division multiplexing. Also, a circular polarizer is applied to minimize the effect of FWM in the optic DWDM system. Simulation studies have been performed using the OPTISYS TEM 13 software for the DWDM system operating at a data rate of 1 Gbps. The system output is measured according to the quality factor and power of FWM products.