Four-wave mixing (FWM) is a occurrence that must be evade in DWDM transmission, but depending on the application it is the basis of significant second-generation optical devices and optical device extent technology. This paper converse the theory of FWM, and then introduces one of its applications-a broadband all-optical concurrent wavelength converter urbanized using a high nonlinearity dispersion fiber (HNL-DSF). That competently produces FWM. The concurrent wavelength exchange of two

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... t formats or bit-rate optical signals, with low input power, is established in a highly nonlinear optical fiber with a single strong continuous-wave pump. The effect of four-wave mixing at highly nonlinear optical fiber is analyzed at 1 km distances with its power.