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+// Example 6.2
+// Calculation of the variance of the signal–ASE beat noise
+// Page no 255
+
+clc;
+clear;
+close;
+
+//Given data
+
+a=1.3*10^-16;                 // PSD of an amplifier
+f=7*10^9;                    // Cut off frequency
+Pi=10*10^-6;                 // Input power
+R=0.8;                      // Responsivity
+G=20;                       // Gain of an amplifier
+
+// The variance of the signal–ASE beat noise
+G=10^(G/10);
+P=G*Pi;
+
+r=4*R^2*P*a*f;
+r=r*10^9;
+
+
+
+
+//Displaying results in the command window            
+printf("\n The variance of the signal–ASE beat noise current is = %0.2f x 10^-9  A^2",r);
+
+
+// The answers vary due to round off error