A simple experimental configuration for measurement of the Raman gain coefficient is demonstrated. The Raman
threshold condition plays a role important to calculate the critical power and the Raman gain coefficient. Analysis of the
Raman threshold for second Stokes shows that the Raman gain coefficient scales with the inverse of the pump
wavelength and the fiber attenuation, the obtained values are approximate to several quantities previously reported. With
those physical properties the single pass evolution of pump and Stokes beams equations are simulated for different fiber
lengths and several coupled pump powers. The numerical simulations show that the fibers losses and the numerical
aperture play a predominant role in the Stokes generation. These results allow designing optical fibers efficient and/or
poor in the Stimulated Raman scattering generation.
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