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// Example 6.12
// Calculation of the ASE power spectral density per polarization.
// Page no 296
clc;
clear;
close;
//Given data
si=30; // Electrical SNRs at the amplifier input
so=25; // Electrical SNRs at the amplifier output
po=2; // Signal power at output
pi=-13; // Signal power at input
h=6.626*10^-34; // Planck constant
f=195*10^12;
// The ASE power spectral density per polarization
fn=si-so;
fn=10^(fn/10);
G=po-pi;
G=10^(G/10);
r=(h*f*(G*fn-1))/2;
r=r*10^18;
//Displaying results in the command window
printf("\n The ASE power spectral density per polarization = %0.3f x 10^-18 W/Hz ",r);
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