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+//Introduction to Fiber Optics by A. Ghatak and K. Thyagarajan, Cambridge, New Delhi, 1999
+//Example 13.3
+//OS=Windows XP sp3
+//Scilab version 5.5.2
+clc;
+clear;
+//given
+Id=1e-9;//Dark current of a silicon PIN photodiode in A
+P=1e-6;//Optical power in W
+R=0.65;//Responsivity in A/W
+e=1.6e-19//Electronic charge in C
+Deltaf=100e6;//Detector bandwidth in Hz
+
+I=R*P;
+mprintf("\n I=%.2f uA",I/1e-6)//Division by 10^(-6) to convert into uA
+//Let the root mean square shot noise current be Ins
+Ins=sqrt(2*e*(I+Id)*Deltaf);//As the root mean square shot noise current is the square root of mean square shot noise current in A
+mprintf("\n The rms shot noise current = %.2f nA",Ins/1e-9);//Division by 10^(-9) to convert into nA
+//The answers vary due to round off error