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+//Example 8.4 // Average nummber of photon
+clc;
+clear;
+close;
+//given data :
+format('v',5)
+M=80;// multiplication factor
+K=0.02;// carrier ionization rates
+eta=85/100;// quntum efficiency
+Bt=0.6;// assuming a raised cosine signal spectrum
+SbyN=144;
+FM=(K*M)+(2-(1/M))*(1-K);
+eta_max=(2*Bt*FM*SbyN)/(eta);
+disp(eta_max,"The average number of photon,(photon) = ")
+// answer is wrong in a textbook