2. Theoretical Analysis
The stimulated Raman scattering (SRS) in silica fibers is governed by a set of nonlinear differential
equations that describe the pump power propagation in a single direction and the SRS in both,
forward and backward directions [14]. In order to describe the technique that allows us to calculate
with high precision the Raman gain efficiency ðgR ¼ gr=AeffÞ, we use one solution to these
equations considering only forward propagation [13]:
ln PF
PF0
PP0
PP
¼ gr
Aeff
PP0Leff (