Analysis of the Q factor of the external modulation with different optical filters to overcome the FWM non-linearity in the fiber Networks

In fiber networks, non-linearity affects the performance of the system. In this research paper, the FWM (four wave mixing) is considered a challenge. To overcome the FWM non-linearity, the quality factors of the external modulation (electronic absorption modulation) with different optical filters (IIR, Butterworth, Bessel, Gaussian and Rectangle optical filters) have been simulated. A system with a bandwidth of 40 Gbps was studied at four different channels with the spacing of 5 nm and capacity of each channel is 10 Gbps. After thorough analysis for obtaining a better quality factor, the Rectangle optical filter is finalized. By obtaining good quality factor, we achieved a 40 Gbps WDM system with a link length of 150 km. currently intermediate line amplifiers are being placed approximately every 80–100 km to compensate the link losses.