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// Example 7.4
// Compuatation of (a) OSNR in a reference bandwidth of 0.1 nm, (b) Q-factor.
// Page no. 321
clc;
clear;
close;
// Given data
f=10*10^9;
n=1.5; //Refractive index
h=6.63*10^-34; // Planck constant
c=3*10^8; // Velocity of light
lambda=1.55*10^-6; //
q=1.6*10^-19; // Electron charge
d=0.1*10^-9; // Reference bandwidth
alpha=0.0461; // Fiber loss coefficient
L=80; // Spacing
Pi=-3; // Mean fiber launch power
N=80; // Identical amplifers
fe=7*10^9; // Electrical filter bandwidth
// Signal calculation
df=-((c*d)/lambda^2); //Reference frequency
G=exp(alpha*L);
G1=10*log10(G);
N1=10*log10(N);
Fn=2*n; //Noise figure
Fn=10*log10(Fn);
O=Pi-N1-G1-Fn+58; //OSNR
Pi1=2*10^(-(3/10)); // Peak power in mW
f=c/lambda;
Q=sqrt((Pi1*10^-3)/(4*N*n*h*f*(G-1)*fe)); //Q-factor
// Displaying the result in command window
printf("\n OSNR is = %0.2f dB",O);
printf("\n Q-factor is = %0.2f ",Q);
// The answer vary due to round off error
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