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// Example 8.45
// Calculation of incident optical power.
// Page no 499
clc;
clear;
close;
//Given data
lambda=1.3*10^-6; // Wavelength
B=6*10^6; // Bandwidth
S=10^5; // Total system margin
n=1; // Efficiency
v=3*10^14;
h=6.62*10^-34; // Planck constant
// Incident optical power
P=(2*S*v*h*B)/n;
P1=10*log10(P/10^-3);
//Displaying results in the command window
printf("\n Incident optical power(in nW) = %0.1f ",P1);
// The answers vary due to round off error
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