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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.