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//Example 12.10
//Program to estimate ratio of SNR of the coaxial system to the SNR
//of the fiber system
clear;
clc ;
close ;
//Given data
V=5; //volts - TRANSMITTER PEAK OUTPUT VOLTAGE
Zo=100; //ohms - CABLE IMPEDANCE
T=290; //Kelvin - OPERATING TEMPERATURE
lambda=0.85*10^(-6); //metre - WAVELENGTH
K=1.38*10^(-23); //J/K - BOLTZMANN's CONSTANT
n=0.7; //(*100) percent - QUANTUM EFFICIENCY
Pi=1*10^(-3); //Watts - OPTICAL POWER
h=6.626*10^(-34); //(m^2)Kg/s - PLANK's CONSTANT
c=2.998*10^8; //m/s - SPEED OF LIGHT
//Ratio SNR(coax)/SNR(fiber)
Ratio=V^2*h*c/(2*K*T*Zo*n*Pi*lambda);
//Displaying the Result in Command Window
printf("\n\n\t SNR(coax)/SNR(fiber) = %d dB.",10*log10(Ratio));
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