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+//Introduction to Fiber Optics by A. Ghatak and K. Thyagarajan, Cambridge, New Delhi, 1999
+//Example 13.5
+//OS=Windows XP sp3
+//Scilab version 5.5.2
+clc;
+clear;
+//given
+R=0.65;//Responsivity of a Si detector in A/W
+Id=1e-9;//Dark current in A
+e=1.6e-19;//Electronic charge in C
+kB=1.38e-23;//Boltzmann constant in SI Units
+Rl=1000;//Assumed value of load resistor Rl in Ohms
+T=300;//Assumed value of temperature in K
+
+NEP=1/R*sqrt(2*e*Id+4*kB*T/Rl);//Noise equivalent power in W/(Hz)^(1/2)
+mprintf("\n NEP = %.2e W/(Hz)^(1/2)",NEP);//The answers vary due to round off error
+//If Id is the major noise term :
+NEP=1/R*sqrt(2*e*Id);//Noise equivalent power in W/(Hz)^(1/2)
+mprintf("\n If Id is the major noise term:");
+mprintf("\n NEP = %.2e W/(Hz)^(1/2)",NEP);