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// Example 8.3.1 page 8.9
clc;
clear;
P=10^-9; //probability of error
eta=1; //ideal detector
h=6.626d-34 //plank's constant
c=3d8; //speed of light
lamda=1d-6; //wavelength
B=10^7; //bit rate
Mn= - log(P);
printf("\n The quantum imit at the receiver to maintain bit error rate 10^-9 is (%.1f*h*f)/eta.",Mn);
f=c/lamda
Popt= 0.5*Mn*h*f*B/eta; //computing optical power
Popt_dB = 10 * log10(Popt) + 30; //optical power in dbm
Popt=Popt*10^12;
printf("\nMinimum incident optical power is %.1f W or %.1f dBm.",Popt,Popt_dB);
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