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//Example 12.12
//Program to determine the average incident optical power required to
//maintain given SNR
clear;
clc ;
close ;
//Given data
Lambda=1*10^(-6); //metre - WAVELENGTH
h= 6.626*10^(-34); //J/K - PLANK's CONSTANT
c=2.998*10^8; //m/s - VELOCITY OF LIGHT IN VACCUM
k=1.38*10^(-23); //J/K - BOLTZMANN's CONSTANT
e=1.602*10^(-19); //Coulumbs - CHARGE OF AN ELECTRON
eeta=0.6; //*100 percent - QUANTUM EFFICIENCY
SNR_dB=45; //dB - CURRENT SNR
Rl=50*10^3; //Ohms - EFFECTIVE LOAD IMPEDANCE
T=300; //K - OPERATING TEMPERATURE
ma=0.5; //MODULATION INDEX
Fn_dB=6; //dB - NOISE FIGURE
B=10*10^6; //Hz - POST DETECTION BANDWIDTH
SNR=10^(SNR_dB/10);
Fn=10^(Fn_dB/10);
//Average incident optical power required to maintain given SNR
Po=h*c/(e*eeta*ma^2*Lambda)*sqrt(8*k*T*Fn/Rl)*sqrt(SNR*B);
//Displaying the Result in Command Window
printf("\n\n\t The average incident optical power required at the receiver is %0.2f uW or %0.1f dBm.",Po/10^(-6),10*log10(Po/10^(-3)));
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