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+// Example 8.50
+// Calculation of signal to noise ratio.
+// Page no 499
+
+clc;
+clear;
+close;
+
+//Given data
+
+h=6.62*10^-34;                       // Planck constant
+c=3*10^8;                           // velocity of light
+lambda=1.55*10^-6;                 // Wavelength
+B=400*10^6;                        // Speed of communication
+s=2;
+// S/N ratio
+
+sn=(s*4.24)/(2^(1/2));
+i=(sn)^2;
+
+//Displaying results in the command window            
+printf("\n Incident optical power(in nW) = %0.20f  ",i);
+
+
+// The answer is wrong in the book
+