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Increase in the data rate of fiber optic communication system is limited due to the nonlinear effects like Self Phase Modulation (SPM) Cross Phase Modulation (CPM),Four Wave Mixing (FWM),Stimulated Raman Scattering (SRS) and Stimulated Brillion Scattering (SBS). Many investigations are carried to mitigate these effects and in multi channel systems, Four-Wave Mixing (FWM) in optical fibers induces channel crosstalk and possibly degrades system performance .A technique to design the channel frequency allocation in order to minimize the crosstalk due to FWM is presented. By using suitable unequal channel spacing it can be found that no four-wave mixing product term is superimposed on any of the transmitted channels. This is obtained at the expense of some expansion of the system bandwidth.
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