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+// Example 4.15.6  page 4.39
+
+clc;
+clear;
+
+L=5;        //length of optical link
+n1=1.5      //refractive index
+c=3d8;      //speed of light
+delta=1/100;        //relative refractive index
+
+delTS=L*n1*delta/c;     //computing delay difference
+delTS=delTS*10^12;
+sigmaS=L*n1*delta/(2*sqrt(3)*c);    //computing rms pulse broadning
+sigmaS=sigmaS*10^12;
+B=1/(2*delTS);        //computing maximum bit rate
+B=B*10^3;
+B_acc=0.2/(sigmaS);     //computing accurate bit rate
+B_acc=B_acc*10^3;
+BLP=B_acc*L;      //computing Bandwidth length product
+
+printf("\nDelay difference is %d ns.\nRMS pulse broadning is %.2f ns.\nBit rate is %.1f Mbit/s.\nAccurate bit rate is %.2f Mbits/s.\nBandwidth length product is %.2f MHz.km.",delTS,sigmaS,B,B_acc,BLP);
+
+//answer in the book for RMS pulse broadning is 72.25 ns, deviation of 0.08ns.
+//answer in the book for Bandwidth length product is 13.85 MHz.km, deviation of 0.01MHz.km.