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// Example 8.50
// Calculation of signal to noise ratio.
// Page no 499
clc;
clear;
close;
//Given data
h=6.62*10^-34; // Planck constant
c=3*10^8; // velocity of light
lambda=1.55*10^-6; // Wavelength
B=400*10^6; // Speed of communication
s=2;
// S/N ratio
sn=(s*4.24)/(2^(1/2));
i=(sn)^2;
//Displaying results in the command window
printf("\n Incident optical power(in nW) = %0.20f ",i);
// The answer is wrong in the book
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