Dual Stage Amplification for All-Optical Amplify and Forward Relays in FSO Links

Abstract

The study investigates the performance enhancement of Free Space Optical (FSO) communication systems through the integration of an All Optical Amplify-and-Forward (AOAF) Relay and dual-stage amplification, utilizing Differential Phase Shift Keying (DPSK) modulated signals. Simulated data indicates that the dual-stage amplification technique, utilizing two Erbium-Doped Fiber Amplifiers (EDFAs) in the proposed AOAF based FSO link, significantly improves the Bit Error Rate (BER) and link characteristics as compared to the single-stage amplification model, which uses one EDFA-based AOAF relay. The investigation assesses the influence of filter wavelength on system performance, showing that certain filter wavelength results in lower BER values, implying the impact of filter selection in FSO communication systems. Additionally, a comparison between Gaussian and Bessel filters demonstrates a higher performance of Gaussian filters in terms of BER reduction. Furthermore, study draws the conclusion of additional filter components effects on system performance, showing enhanced BER and link quality. Generally, the present study is the novel contribution with practical alternatives for enhancing the efficiency and reliability of FSO communication systems and laying the foundation for the development of high-speed optical communication networks in the future.