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// Example 2.7
// Calculation of normalized frequency and no of guided modes
// Page no 481
clc;
clear;
close;
//Given data
lambda=1.55*10^-6; // Wavelength of fiber
a=30*10^-6; // Core diameter of fiber
delta=0.015; // Relative refractive index
n1=1.48; // Refractive index of core
// (a) Normalized frequency
v=(2*%pi*a*n1*(2*delta)^(1/2))/lambda;
//(b) Number of guided modes
m=v^2/2;
//Displaying results in the command window
printf("\n Normalized frequency = %0.2f ",v);
printf("\n Number of guided modes = %0.0f ",m);
// The answers vary due to round off error
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