Minimization of Power Panelty and Crosstalk due to Four Wave Mixing of WDM System by Using CPFSK Modulation Technique

In Optical fiber communication, several types of impairment may be introduced to the signal. These impairments result in degradation in system performance. e. g high bit error rate and power penalty. This paper work deals with effect of four-wave -mixing (FWM) that degrades the long distance communication in fiber optical communication. Due to the FWM, crosstalk occurs in WDM systems which reduces the quality of the transmission and extra amount of power is required to overcome the effect of FWM. In this paper the four wave mixing is reduced by using continuous phase frequency shift keying (CPFSK). The effect of chromatic dispersion, channel spacing, channel count and input power on FWM is observed by changing the one parameter keeping the other constant and the simulation results obtained are compared with the standard IMDD .It has been seen the CPFSK is better alternative than standard IMDD when FWM is considered. The work is implemented in Optsystem software.