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// Example 2.7.10 page 2.29
clc;
clear;
n1=1.48; //refractive index of core
n2=1.46; //refractive index of cladding
lamda1=1320d-9; //Wavelength
lamda2=1550d-9; //Wavelength
a=25d-6; //radius of core
NA=sqrt(n1^2 - n2^2); //computing Numerical aperture
v1=2*%pi*a*NA/lamda1; //computing normalized frequency
v1=round(v1);
M1=v1^2/2; //computing number of guided modes
M1=round(M1);
v2=2*%pi*a*NA/lamda2;
M2=v2^2/2;
M2=round(M2);
lamda1=lamda1*10^9;
lamda2=lamda2*10^9;
printf("\nfor %d nm, normalized frequency = %d, Guided modes = %d.",lamda1,v1,M1);
printf("\nfor %d nm, normalized frequency = %.2f, Guided modes = %d.",lamda2,v2,M2);
//answer in the book,
//for 1550 nm, normalized frequency = 24.69(deviation of 0.08), Guided modes = 305(deviation of 3)
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