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In this paper, a new theoretical model for Rayleigh backscattering (RB) analysis of fiber Raman amplifiers is proposed. The model includes all the interactions among the pumps, signals, and all orders of RB. The results show that the higher order RB has a negligible influence on the performance of the amplifier. The co-propagating and counter-propagating RB power of the signal grow quadratically with the net-gain of the amplifier. The signal to double Rayleigh backscattering noise ratio (OSNR DRB ) of backward-pumped FRAs is better than that of the forward-pumped ones at high net-gain level (>13 dB), while at low net-gain level the OSNR DRB of the forward-pumped FRAs is slightly better than that of the backward-pumped ones.
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Zhaoxia Sheng (2005) studied this question.
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