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+//clear//
+//Caption: Upper bound on input optical signal power
+//Example11.10
+//page 415
+clear;
+clc;
+close;
+etta = 0.65; //Quantum efficiency
+nsp = 2; // population inversion between two levels
+R =50; //load resistance inohms
+Lambda = 1550e-09; //operating wavelength in meters
+T = 300; //room temperature in kelvins
+kB = 1.38054e-23; //boltzmann's constant
+h = 6.6256e-34; //plank's constant
+C = 3e08; //free space velocity in m/s
+V = C/Lambda; //frequency in Hz
+q = 1.602e-19; //charge in columbs
+Ps_in = kB*T*h*V/(R*nsp*(etta^2)*(q^2));
+disp(Ps_in*1e06,'Upper bound on input optical signal power in micro watts Ps_in=')
+//Result
+//Upper bound on input optical signal power in micro watts Ps_in =  489.81635