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+// Example 7.9.2  page 7.46
+
+clc;
+clear;
+
+lamda=1300d-9;
+h=6.626d-34;    //plank's constant
+c=3d8;      //speed of light
+q=1.6d-19;  //charge of electron
+eta=90/100; //quantum efficiency
+P0=300d-9;  //optical power
+Id=4;    //dark current
+B=20d6;     //bandwidth
+K=1.39d-23; //Boltzman constant
+T=298;      //temperature
+R=1000;     //load resister
+Ip= 10^9*eta*P0*q*lamda/(h*c);
+Its=10^9*(2*q*B*(Ip+Id));
+Its=sqrt(Its);
+printf("\nrms shot noise current is %.2f nA.",Its);
+
+It= 4*K*T*B/R;
+It=sqrt(It);
+printf("\nThermal noise is %.2e A.",It);
+
+//answer given in book for shot noise is 1.34nA, deviation of 0.01nA.
+//answer given in book for Thermal noise it is 1.81*10^-8 A, deviation of 0.01*10^-8.