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// Example 6.2
// Calculation of the variance of the signal–ASE beat noise
// Page no 255
clc;
clear;
close;
//Given data
a=1.3*10^-16; // PSD of an amplifier
f=7*10^9; // Cut off frequency
Pi=10*10^-6; // Input power
R=0.8; // Responsivity
G=20; // Gain of an amplifier
// The variance of the signal–ASE beat noise
G=10^(G/10);
P=G*Pi;
r=4*R^2*P*a*f;
r=r*10^9;
//Displaying results in the command window
printf("\n The variance of the signal–ASE beat noise current is = %0.2f x 10^-9 A^2",r);
// The answers vary due to round off error
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