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//Example 3.7
//Program to estimate rms pulse broadening per kilometer for the fiber
clear;
clc ;
close ;
//Given data
lambda=0.85*10^(-6); //metre - WAVELENGTH
L=1; //km - DISTANCE
MD=0.025;//MATERIAL DISPERSION = mod(lamda^2*[del^2(n1)/del(lamda)^2)
c=2.998*10^8; //m/s - VELOCITY OF LIGHT IN VACCUM
sigma_lambda_by_lambda=0.0012;// sigma_lambda/lambda
//Material Dispersion Parameter
M=MD/(lambda*c);
//R.M.S. Spectral Width
sigma_lambda=sigma_lambda_by_lambda*lambda;
//R.M.S. pulse broadening per kilometer
sigma_m=sigma_lambda*L*M;
//Displaying the Result in Command Window
printf("\n\n\t R.M.S. pulse broadening per kilometer is %0.2f ns/km.",sigma_m/10^(-12));
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