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This article presents the mitigations of Four-Wave Mixing (FWM) using extrinsic and intrinsic methods in fiber optic Dense wavelength Division Multiplexing (DWDM) system design. The presence of FWM introduces excessive sidelobes in the DWDM system, which consumes high input power, lowers spectral efficiency, and increased structural design complexity with network latency. FWM in DWDM introduces more signal distortion and cross talk, which lowers system gain, Q-factor and output signal power that degrades DWDM system performance. In this paper, DWDM system is implemented with Germanosilicate doped EDFA (GS-EDFA) and Reflectivity based Fiber Bragg Grating (R-FBG) to mitigate FWM. The proposed DWDM design achieves high gain of 43.69753 dB, with Q-factor 118.585 and an optimal output signal power using intrinsic and extrinsic methods and reduces the excessive side lobes due to …