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// Example 6.5
// Calculation of the OSNR in a bandwidth of 12.49 GHz.
// Page no 263
clc;
clear;
close;
//Given data
G=25; // Gain
c=3*10^8; // Velocity of light
h=6.63*10^-34 // Planck constant
lambda=1545*10^-9; // Wavelegth
Pi=-22; // Input power
fn=6;
B=12.49*10^9;
// The OSNR in a bandwidth of 12.49 GHz
Po=G+Pi;
Po=10^(Po/10);
Po=Po*10^-3;
fn=10^(fn/10);
G=10^(G/10);
f=c/lambda;
r=(G*fn-1)*(h*f/2);
O=Po/(2*r*B);
O=10*log10(O);
// Displaying results in the command window
printf("\n The OSNR in a bandwidth of 12.49 GHz = %0.2f dB",O);
// The answers vary due to round off error
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