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// Example no.3.9
// To calculate a) the frequency separation between modes (b) the wavelength separation between modes
// Page no.133
clc;
clear;
// Given data
lambda=1.3*10^-6; // Laser diode operating wavelength
L=300*10^-6; // Cavity length
n=3.5; // Refractive index of active region
c=3*10^8; // Speed of ligth in air (m/s)
// a)The frequency separation between modes
deltaf=c/(2*n*L); // The frequency separation between modes in GHz
// Displaying the result in command window
printf('\n The frequency separation between modes = %0.1f GHz',deltaf*10^-9);
// (b)The wavelength separation between modes
deltalambda=(lambda^2*deltaf)/c; // The wavelength separation between modes
// Displaying the result in command window
printf('\n The wavelength separation between modes = %0.1f nanometer',deltalambda*10^9);
// The wrong unit is givan in book
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