Gain flattening of EDFA in C-band using RFA for WDM application

An optimal wideband gain flattened hybrid erbium-doped fiber amplifier/fiber Raman amplifier (EDFA/RFA) with the transmission of sixteen channels in C band ranging from 1528.77 nm to 1554.37 nm in wavelength division multiplexing (WDM) has been modeled to obtain maximum gain uniformity with noise figure <; 6dB. Numerous parameters which are the parameters of the erbium-doped fiber amplifier (EDFA) and the fiber Raman amplifier (RFA) define the gain spectrum of a hybrid EDFA/RFA and an effort has been made to optimize these parameters by simulating the system in optisystem software.

In this paper, we optimize the length of EDFA, and then for different values of pump powers and pump wavelengths of the RFA, the operating gain spectrum and noise figure of the hybrid EDFA/RFA is analyzed. It results in reduction in gain variation to 2.4609 dB with tolerable NF. Another technique employing gain flattening filter is analyzed which results in reduction of gain variation of EDFA to 0.0015 dB. A comparison between the two techniques is made.

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