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// Example 8.3
// Calculation of the maximum transmission distance.
// Page no 394
clc;
clear;
close;
//Given data
p=3; // Peak power
tb=40*10^9; // Bit rate
c=3*10^8; // Velocity of light
lambda=1550*10^-9; // Operating frequency
l=0.2; // Loss
d=80; // Distance
G=16 // Gain
h=6.626*10^-34 // Planck constant
n=1;
pb=10^-5; // Error probability
l1=80*10^3; // N spans
// The maximum transmission distance
p=p+10*log10(1/2);
p=10^(p/10)*10^-3;
t=1/(tb);
E=p*t;
f=c/lambda;
fl=l*d;
G=10^(G/10);
r=n*h*f*(G-1); // Calculation is wrong in book.
//pb=1/2*(exp(-(E/r)));
N=-(E/(log(2*pb)*r));
L=N*l1;
// Displaying results in the command window
printf("\n The maximum transmission distance = %0.2f km",L*10^-3);
// In the book PSD per amplifier calcualation is wrong, therefore final answer is wrong.
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