Performance Analysis of Dual -Stage Raman Amplifier in Terms of Gain and Noise Figure

Abstract

This study determines the optimal configuration for dual-stage backward-pumped Raman fiber amplifiers to maximize gain and minimize noise figure in 1550 nm coherent transmission systems. A systematic numerical analysis was conducted using OptiSystem 7.0 software, comparing single-stage and dual-stage architectures. The methodology involved varying key parameters—pump power distribution from a 1480 nm laser source, Raman fiber length, and input signal power—within a fully loaded system framework. Critical simulation findings were validated through experimental measurements. The analysis identifies a dual-stage amplifier with 10 km per stage and an input signal power of -10 dBm as the optimal configuration. This design delivers superior gain flatness and a measurably lower noise figure than both single-stage designs and alternative dual-stage parameter sets. The result provides a concrete design guideline for developing high-performance Raman amplification systems in modern optical networks.