Theory shows that the gain bandwidth of a one-pump fiber optical parametric amplifier (OPA) using highly nonlinear fiber (HNLF) could be more than 200 nm. Under these circumstances, the OPA gain would overlap the pump-induced Raman gain. We have studied the combined effects of OPA and Raman gain theoretically and experimentally. The experimental results demonstrate a 200-nm bandwidth from a single fiber-optical amplifier and also verify that the influence of the Raman effect is relatively small, as predicted by the theory.
Min-Chen Ho, Katsumi Uesaka, Michel Marhic, Youichi Akasaka, and Leonid G. Kazovsky, "200-nm-Bandwidth Fiber Optical Amplifier Combining Parametric and Raman Gain," J. Lightwave Technol. 19, 977- (2001)