Abstract

Wavelength division multiplexing (WDM) allows multiple channels to transmit the data at high speed at same\ninstant. As signal travels longer distance they undergo attenuation, thus erbium doped fiber amplifiers (EDFAs) are used to\namplify signals of all channels. But, it provides different gains to different WDM channels which in turn degrades the overall\nsystem performance. Thus, there is a need for equal amplifications of all channels. In order to achieve the flatten gain,\ncascaded fiber Bragg gratings (FBGs) are used. FBGs are designed depending on the desired reflectivity. In this paper, the\nperformances of WDM optical communication system with and without gain equalizer are studied. The performance\nevaluations of the system are studied through calculating quality factor (Q), bit error rate (BER) and eye diagram. Thus, this\ntechnique can be used to achieve gain equalization of any arbitrary gain profile.