Gain Flatness and Bit Error Rate Improvements for an EDFA in WDM System

The Gain flatness of EDFA (Eridium Dopedd Fiber Amplifier) plays a important role for WDM optical application. The purpose of this paper is to improve the gain uneveness for each channel in order to equalize the amplitude in a Wavelength Division Multiplexing (WDM) system .By using low pass Chebshev filter, tunning numerical aperature, fiber length and pump power we can improve the gain faltness. The gain are flattened within 33.5795dB-33.9714dB from 1546nm-1558nm band of wavelength with noise figure(NF) < 7dB, output power 18 dB, Bit Error Rate (BER) < 10 & Quality factor is 14.78. By theses above parameters we achieved the gain flatness is 0.3dBThe design is simulated using Optisystem 12 software.