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// Chapter 3 Additional Example 5
//==============================================================================
clc;
clear;
//input data
NA = 0.25; // Numerical aperture
d = 6*10^-6 // core diameter
lamda = 1.5*10^-6; // wavelength of laser source
n1 = 1.47; // refractive index of core
n2 = 1.43 // refractive index of cladding
// calculations
NA = sqrt( n1^2 - n2^2); // Numerical Aperture
N = 4.9*(d*NA/lamda)^2; // no of modes for step index fibre
// Output
mprintf('No. of total modes propagating in the fibre = %d',N);
//==============================================================================
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