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+// Example 7.9 
+// Compuatation of the (a) the length of the DCF (b) the gain G2 and (c) the Q-factor.
+//
+// Page no. 331
+
+clc;
+clear;
+close;
+
+//Given data
+b=-21*10^-27;
+L=100*10^3;
+Lt=100;
+l=0.18;               // Loss
+l1=0.5;               // Dispersion coefficients of the TF
+G1=16;                // Amplifier gain
+p=-2;                 // Mean transmitter output power
+fe=7*10^9;
+c=3*10^8;             // Velocity of light
+h=6.62*10^-34;       // Planck constant
+fn1=5.5;             // Noise figure of amplifier 1
+fn2=7.5;             // Noise figure of amplifier 2
+lambda=1.55*10^-6;
+bd=145*10^-27;      // Dispersion coefficients of the DCF
+
+// (a) The length of the DCF
+st=b*L;
+sd=-0.9*st;
+Ld=sd/bd;
+Ld=Ld*10^-3;
+// (b) Gain G2
+Ht=l*Lt;
+Hd=l1*Ld;
+G2=Ht+Hd-G1;
+
+// (c) Q factor
+Ge=G1+G2+-Hd;
+Ge=10^(Ge/10);
+fn1=10^(fn1/10);
+fn2=10^(fn2/10);
+G1=10^(G1/10);
+Hd=10^(-Hd/10);
+Fe=fn1+(fn2/(G1*Hd))-(1/G1);
+f=c/lambda;
+r=70*h*f*(((Ge*Fe)-1)/2);
+Pi=2*10^(p/10)*10^-3;
+Q=sqrt(Pi/(4*r*fe));
+
+
+//Displaying the result in command window
+printf("\n The length of the DCF = %0.2f km",Ld);
+printf("\n Gain G2 = %0.2f dB",G2);
+printf("\n Q factor= %0.1f ",Q);
+
+// The answer vary due to round off error
+
+