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+//Example 7_7
+clc();
+clear;
+//To calculate the dispersion and bandwidth length product
+L=10                        //units in Km
+n=1.55
+delta=0.026
+C=3*10^5                   //units in meter per second
+T=(L*n*delta)/C*10^9
+printf("The total dispersion is %.1f ns",T)
+l=1/(2*T*10^-9)*10
+printf("\nThe bandwidth length product is %.2f HZ-Km",l)
+//in text book answer is wrong as 7044*10^5 correct answer is 3722084.37