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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));
+\ No newline at end of file