Analyzing and Compensation of Non Linear effects on DWDM based Optical Fiber Communication System

Abstract

Implementing a dense wavelength division multiplexing (DWDM) configuration can substantially enhance the capacity of an optical communication system. Nonetheless, the DWDM system encounters notable challenges due to nonlinear effects that hinder its performance. Self-phase modulation (SPM), cross-phase modulation (XPM), and four-wave mixing (FWM) are three key factors that exert a significant influence on the system's optical communication capabilities. The primary objective of this research is to tackle and alleviate the nonlinear impact of cross-phase modulation within the DWDM system through an effective approach. In this research, we introduce a method for correcting dispersion in DWDM systems. These nonlinearities, encompassing self-phase modulation, cross-phase modulation, and four-wave mixing, are common occurrences in such systems. The researcher's proposal primarily centers on addressing cross-phase modulation. To comprehensively assess the DWDM system, we explored the effects of fluctuations in power and data rates. According to the results, a 32 channel DWDM system can effectively correct nonlinearities utilizing the suggested Symmetrical-Symmetrical-Post compensation technique (SSP) up to a transmission distance of 400 km using an input power of 20mW & data rate of 100 Gbps. These characteristics are ideal for long-distance optical communication. Suitably modifying the data rate and input power, it is feasible to increase no of channels and transmission distance. The new SSP method was also found to perform better than the conventional post-compensation methodology, making it more appropriate for long-haul DWDM systems. It is crucial to understand that the SSP technique by itself is unable to fully offset the spectral broadening brought on by cross-phase modulation. In order to solve this problem, combining sophisticated modulation methods with SSP can successfully reduce the spectrum broadening. This strategy can call for the use of more amplifiers, which could result in increased power consumption. In such configurations, dynamic control of the erbium-doped fiber amplifier (EDFA) is essential.