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// Example 2.7.17 page 2.35
clc;
clear;
NA=0.25; //Numericla aperture
d=45d-6; //Diameter of core
lamda=1.2d-6; //Wavelength
a=d/2; //computing radius
v=2*3.14*a*NA/lamda; //computing normalized frequency
Mg=v^2/4; //computing mode volume for parabollic profile
Mg=round(Mg);
printf("\nNormalized Frequency is %.1f.\nTotal number of guided modes are %.d.",v,Mg);
printf("\n\nNOTE - In the question NA is given 0.22. However while solving it is taken as 0.25");
// answer in the book for number of guided modes is given as 216, deviation of 1.
printf("\nHence solving for NA = 0.22 also,");
printf("\n\nWhen NA=0.22");
NA=0.22; //Numericla aperture
d=45d-6; //Diameter of core
lamda=1.2d-6; //Wavelength
a=d/2; //computing radius
v=2*3.14*a*NA/lamda; //computing normalized frequency
Mg=v^2/4; //computing mode volume for parabollic profile
Mg=round(Mg);
printf("\nNormalized Frequency is %.1f.\nTotal number of guided modes are %.d.",v,Mg);
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