The effect of stimulated Brillouin scattering is considered and found to be important in high power
optical fibers especially when amplifier is used. Numerical simulation has been done to show how the
effect of stimulated Brillouin scattering is affects the amplified spontaneous emission and the signal.
Found the difference between just decrease the Brillouin signal and decrease the NF, and give a method
to decrease it through change the pump method.