TUNABLE COHERENT OPTICAL TRANSVERSAL EDFA GAIN EQUALIZATION

In this paper, we propose a fiber amplifier gain equalizer using a coh erent optical transversal filter., The gain equalizer is tunable and h as a bandwidth in the order of 30 nm, We also study the effects of dif ferent parameters such as input signal power pattern and the input pum p power on the gain profile of the amplifier, The results show that, w hen the input signal power pattern changes, the amplifier does not mai ntain its gain profile, The gain profile has to be maintained in order to make the gain equalization effective, We show that, the pump input power can be adjusted so that the changes in the gain profile are com pensated for, The gain profile varies quite slowly, hence compensation is feasible. As an example, we discuss the design of a gain equalizer for a system consisting of seven wavelength channels.