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Document Type

Original Article

Abstract

This paper presents an in-depth investigation into applying a frequency domain Volterra series nonlinear equalizer (FD-VNLE) to mitigate nonlinear impairments in optical communication systems operating at high speeds. The study aims to address the issues presented by nonlinear effects, specifically self-phase modulation (SPM), which significantly degrades system performance at higher power levels. A comprehensive mathematical model of the FD-VNLE was developed to provide theoretical insight, while its implementation was carried out using MATLAB co-simulated with OptiSystem. The performance of the 40 Gbps dual-polarization quadrature phase shift keying (DP-QPSK) system was rigorously evaluated, focusing on critical performance metrics like bit error rate (BER) and quality factor (Q-factor). Simulation results indicated that without nonlinear compensation, the system experienced performance degradation beyond an input power of 12 dBm, where the optimum BER was 10 -77 and the Q-factor was 18. However, deploying FD-VNLE and applying digital signal processing (DSP) successfully reduced the BER to 10 -300 and improved the Q-factor to 100, maintaining consistent performance up to an input power of 17 dBm. The DSP further diminished residual phase noise and significantly improved the reliability of the system. These findings highlight the promise of FD-VNLE as a powerful tool for enhancing the efficiency and scalability of next-generation high-speed, long-distance optical networks

Receive Date

31/01/2025

Revise Date

04/05/2025

Accept Date

18/05/2025

Publication Date

6-1-2025

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