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// Example 2.7.8 page 2.28
clc;
clear;
core_diameter=80d-6; //core diameter
delta=1.5/100; //relative index difference
lamda=0.85d-6; //operating wavelength
n1=1.48; //core refractive index
a=core_diameter/2; //computing core radius
v= 2*%pi*a*n1*sqrt(2*delta)/lamda; //computing normalized frequency
M=(v)^2/2; //computing guided modes
printf("\nNormalized Frequency is %.1f.\nTotal number of guided modes are %.d.",v,M);
//answer in the book for Guided modes is 2873, deviation of 1.
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