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//Example 3.3
//Program to compare the threshold optical powers for stimulated
//Brillouin and Raman Scattering
clear;
clc ;
close ;
//Given data
alpha_dB=0.5; //dB/km - ATTENUATION
lambda=1.3; //micrometre - OPERATING WAVELENGTH
d=6; //micrometre - FIBER CORE DIAMETER
nu=0.6; //GHz - LASER SOURCE BANDWIDTH
//Threshold optical power for SBS
Pb=4.4*10^(-3)*(d^2)*(lambda^2)*alpha_dB*nu;
//Threshold optical power for SRS
Pr=5.9*10^(-2)*d^2*lambda*alpha_dB;
//Displaying the Results in Command Window
printf("\n\n\t The threshold optical power for SBS is %0.1f mW.",Pb*10^3);
printf("\n\n\t The threshold optical power for SRS is %0.2f W.",Pr);
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