Analyzing the Effect of Channel Spacing and Chromatic Dispersion Coefficient on FWM in Optical WDM System

In order to minimize the system impairments produced as a result of repeater circuits, optical amplifiers are utilized in wave division multiplexed (WDM) systems these days, which are capable of amplifying complete WDM signal in optical domain directly.Although WDM systems are capable of transmitting data at high data rates still, it faces many serious problems which degrade the performance of the optical transmission system such as four-wave mixing (FWM).In this paper, the effect of channel spacing in WDM systems and chromatic dispersion coefficient value on optical transmission system's performance in terms of eye diagrams and input-output spectrums is discussed.The outcomes of the simulations show that by using unequal channel spacing FWM is reduced and it can be further reduced by increasing the value of dispersion coefficient.