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+//Introduction to Fiber Optics by A. Ghatak and K. Thyagarajan, Cambridge, New Delhi, 1999
+//Example 13.9
+//OS=Windows XP sp3
+//Scilab version 5.5.2
+clc;
+clear;
+//given
+P=500e-9;//Optical power in W
+R=0.45;//Responsivity in A/W
+Rl=1000;//Value of load resistor in Ohms
+e=1.6e-19//Electronic charge in C
+kB=1.38e-23;//Boltzmann constant in SI Units
+T=300;//Missing data- Temperature in K
+x=1;//Excess noise
+Id=0;//Since the dark current is neglected in the example
+
+Mop=(4*kB*T/(x*e*Rl*(R*P+Id)))^(1/(x+2));//Optimum value of internal gain corresponding to input optical power P
+mprintf("Mop= %.1f",Mop);