Abstract
Raman Fiber Amplifiers offer an adjustable gain spectrum in terms of band width ,gain window and gain spectrum shape ,thus the composite Raman gain can be very flat over a wide band In this work an investigation on Raman gain with backward pumping is introduced using twelve pump lasers with optimum pump power to produce gain flattened for 94 nm band width from 1520 to 1614 nm that contains 100 equal spaced channels, with again ripple of 1.28dB which contain the C-and L-band. Over 25 Km span. Then the effect of fiber length on the gain flatting were introduced and the gain saturation have been analyzed.
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