Optimization of GainFlatness for Raman Optical Amplifier Based on Pump Power and Frequencies

Abstract

Raman optical fiber amplifier well suited for multiwavelength long-distance transmission systems. In such applications, optical amplifiers must provide equal gain and noise for each wavelength. The method is based on adjust the power and frequency of the four pump of Optical Raman Amplifier and use Multi Parameter Optimization (MPO) feature in Opti-system simulation software to get the desired flatness, the multi parameter feature adjust and tune the frequency and power of four pump to get the target gain and flatness through rounds of iterative optimization process,the gain for each channel can be observed through Dual spectrum analyzer, The improvement of gain flatness begore and after optimization can be observed through spectrum analyzer, a comparison of two scenarios of gain flatness is conducted, the first comparison is about compare flatness for 64 wavelengths before optimization with optimized at gain 6db and the second comparison is about compare the 64 wavelengths before optimization with optimized at gain at 10db., as conclusion it has been noticed the considerable improvement of gain unflattens from 4db to 1.4db. getting 2.6 gain flatness for optical Raman amplifier at 10db gain will be resulted in possibility to transmit more wavelengths which mean higher capacity for long-distance with lower bit error rate and noise