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+// Example 4.15.10  page 4.42
+
+clc;
+clear;
+
+tau=0.1d-6;     //pulse broadning
+dist=18d3;      //distance
+
+Bopt=1/(2*tau);     //computing optical bandwidth
+Bopt=Bopt*10^-6;
+dispertion=tau/dist;        //computing dispersion
+dispertion=dispertion*10^12;
+BLP=Bopt*dist;      //computing Bandwidth length product
+BLP=BLP*10^-3;
+printf("\noptical bandwidth is %d MHz.\nDispersion per unit length is %.1f ns/km.\nBandwidth length product is %d MHz.km",Bopt,dispertion,BLP);
+printf("\nNOTE - printing mistake in the book at dispersion per unit length.\nThey have printed ps/km; it should be ns/km");
+
+//printing mistake in the book at dispersion per unit length.They have printed ps/km; it should be ns/km.
+//answer in the book 5.55 ps/km (incorrect)