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+//OptoElectronics and Fibre Optics Communication, by C.K Sarkar and B.C Sarkar
+//Example 6.7
+//OS=Windows 10
+////Scilab version Scilab 6.0.0-beta-2(64 bit)
+clc;
+clear;
+
+//given
+A=(100)*(50);//area in u-meter^2
+Id=10e-9;//Measured dark current in nanoampere
+eta=0.6;//Quantum efficiency is 60%
+lamda=1.2e-6;//operating wave length in micrometer
+e=1.6e-19;//charge of an electron in columb
+h=6.62e-34;//plank's constant in S.I units
+c=3e8;//velocity of light in m/s
+
+NEP=[h*c*sqrt(2*e*Id)]/(eta*e*lamda);//noise equivalent power in watts
+D=sqrt(A*10^-12)/(NEP);//Specific directivity of the device
+mprintf("\n Noise equivalent power is=%.2f *10^-14 W",NEP*10^14);//multiplication by10^-14 to change the unit 10^-14 W
+mprintf("\n Specific directivity is=%2.f *10^8m Hz^(1/2)/W",D/10^8)//multiplication by10^8 to change the unit 10^8 m Hz^(1/2)/W