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+// Example 4.15.5 page 4.39
+
+clc;
+clear;
+
+tau=0.1d-6; //pulse broadning
+dist=15d3; //distance
+
+Bopt=1/(2*tau); //computing optical bandwidth
+Bopt=Bopt*10^-6;
+dispertion=tau/dist; //computing dispersion
+dispertion=dispertion*10^12;
+printf("\noptical bandwidth is %d MHz.\nDispersion per unit length is %.2f ns/km.",Bopt,dispertion);