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Study of FWM effects in WDM system: A review

In this review paper we have given an overview of FWM effect in WDM systems and studied non-linear effect that affects the fiber communication performance. Non-linear effects like four wave mixing, cross-phase modulation, self phase modulation, stimulated raman scattering and stimulated brillouin scattering. Chief objectives of the paper are to review FWM effect and its reduction. We have also review certain methods that can be used to reduce the FWM effect in WDM systems.