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// Example no. 2.12
// To find the delay between the shortest and longest path.
// Page no. 81
clc;
clear;
// Given data
NA=0.2; // Numerical aperture
L=2*10^3; // Fiber length in meters
n1=1.45; // Core refractive index
delta=(NA)^2/(2*n1^2); // Relative index difference
n2=n1; // since difference between core index and cladding index is smaller
c=3*10^8; // Speed of ligth in m/s
// The delay between the shortest and longest path.
deltaT=((n1^2*L*delta)/(c*n2)); // the delay between the shortest and longest path.
// Displaying the result in command window
printf('\n The delay between the shortest and longest path = %0.2f ns',deltaT*10^9);
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