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+//fiber optic communications by joseph c. palais

+//example 11.4

+//OS=Windows XP sp3

+//Scilab version 5.4.1

+//given

+clc

+clear all

+//given

+lambda=0.85e-6//wave length in um

+Row=0.5//respomsivity in A/W

+ID=2*10^-9//Detector dark current in A

+RL=100//load resistance in ohm

+deltaf=1*10^6//receiver's bandwidth in Hz

+T=300//temperature in Kelvin

+e=1.6*10^-19//charge of electron in columbs

+k=1.38e-23//boltzman constant

+

+//to find

+

+for i=1:6

+    RL1(i)=10^(i*2);//range of load resistance in ohm

+    logRL(i)=log10(RL1(i))//log scale representation of load resistance

+    iNT(i)=sqrt(4*k*T*deltaf/RL1(i))//rms thermal noise current in A

+iNSD(i)=sqrt(2*e*ID*deltaf)//rms shot noise current in A

+NEP(i)=sqrt(iNSD(i)^2+iNT(i)^2)/(R*sqrt(deltaf))//Noise equivalent power (NEP) in W/Hz^1/2

+

+logNEP(i)=log10(NEP(i))

+end

+iNT1=sqrt(4*k*T*deltaf/RL)//rms thermal noise current in A

+iNSD1=sqrt(2*e*ID*deltaf)//rms shot noise current in A

+NEP1=sqrt(iNSD1^2+iNT1^2)/(R*sqrt(deltaf))//Noise equivalent power (NEP) in W/Hz^1/2

+Pmin=NEP1*sqrt(deltaf)//minimum detectable power

+mprintf("Minimum detectable power =%fnW",Pmin*10^9)//multiplication by 10^9 to convert unit from W to nW

+plot2d('ll', RL1, NEP)

+

+xtitle( "Noise equivalent power for a PIN diode having 2nA of Dark current and a 0.5W/A responsivity at 300K", "Load Resistance (Ohms)", "NEP  (W/Hz^1/2)") ;

+

+

+

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