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+// Example 6.1
+// Calculation of the gain
+// Page no 249
+
+clc;
+clear;
+close;
+
+//Given data
+
+n=1.5;                    // Refractive ondex of air
+lambda=1550*10^-9;        // Wavelength 
+c=3*10^8;                 // Velocity of light
+p=5.73*10^-17;            // Power spectral density
+h=6.63*10^-34             // Planck constant
+
+
+// Gain
+f=c/lambda;
+
+G=(p/(2*n*h*f))+1;
+
+//Displaying results in the command window            
+printf("\n Gain G = %0.0f  ",G);
+
+
+
+
+