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// Example 9.9
// Calculation of the (a) the signal power/subcarrier/polarization at the fiber output, (b) the data rate and (c) the spectral efficiency
// Page no 414
clc;
clear;
close;
//Given data
fl=0.19; // Fiber loss
fg=70; // Fiber length
nc=24; // No of channels
ip=2;
bs=10*10^9; // Symbol rate per polarization
ts= 12.8*10^-9; // Symbol period
n=64; // No of subcarriers
np=2; // Launch power to the fiber
// (a) The signal power/subcarrier/polarization at the fiber output
T=fl*fg;
p=ip-T;
p1=10^(p/10);
s=p1/(np*n);
//s=s*10^4;
// (b) The data rate
bs=1/ts;
B=log2(n)*bs;
bt=B*2*n;
// (c) the spectral efficiency
Tb=n*bs;
se=bt/Tb;
//Displaying results in the command window
printf("\n The signal power/subcarrier/polarization at the fiber output = %0.3f x 10^-4 mW ",s*10^4);
printf("\n The data rate = %0.0f Gb/s ",bt*10^-9);
printf("\n The spectral efficiency = %0.0f b/s/Hz ",se);
// The answers vary due to round off error
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