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Flattening the Gain in 16 Channel EDFA-WDM System by Gain Flattening Filter

In EDFA (Erbium Doped Fiber Amplifier) the gain flattening is a very important issue. EDFA plays a very important role in WDM optical applications. EDFA is very compatible with WDM applications because of its high gain, high bandwidth, low noise. The uneven gain characteristic is the main drawback of EDFA. In this paper we optimize the flatness of gain by using Gain flattening filter (GFF). A gain flattening filter restores all wavelengths to approximately the same intensity. By using GFF we achieved the gain flatness within the gain 27.6182dB-27.2785dB i.e. 0.33dB (27±0.33dB) at bit error rate of nearly of 10-10. In this paper we have used low pass raised cosine filter having roll off factor 0.5. We have meticulously flattened the gain and have maintained low noise figure less than 4dB. The EDFA-WDM system is simulated on Optisystem 12 software. We have achieved the quality factor nearly of 6. The objective of this paper is to achieve the most equalized gain for every channel.