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// Example 8.47
// Calculation of incident optical power.
// 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
// Maximum repeater spacing
P=(36*h*c*B)/lambda;
P=10*log10(P/10^-3);
//Displaying results in the command window
printf("\n Incident optical power(in nW) = %0.3f ",P);
// The answers vary due to round off error
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