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+// Example 6.4
+// Calculation of the amplifier gain
+// Page no 262
+
+clc;
+clear;
+close;
+
+//Given data
+
+Po=0;                   // Signal output of amplifier
+//f=7*10^9;             // Cut off frequency
+B=7.5*10^9;             // Bandwidth
+R=0.9;                  // Responsivity
+c=3*10^8;               // Velocity of light
+lambda=1550*10^-9;      // Operating frequency
+fn=4.5;                 // Noise figure
+Ro=0.066*10^-3;         // Beat noise current
+h=6.626*10^-34;         // Planck constant
+
+// The amplifier gain
+P=10^(Po/10)*10^-3;
+r=Ro^2/(4*R^2*B*P);
+fn=10^(fn/10);
+f=c/lambda;
+G=(1/fn)*(((2*r)/(h*f))+1);
+
+
+
+
+//Displaying results in the command window            
+printf("\n The amplifier gain = %0.0f  ",G);
+
+
+// The answers vary due to round off error