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//Fiber-optics communication technology, by Djafer K. Mynbaev and Lowell L. Scheiner
//Example 11.3.1
//windows 7
//Scilab version-6.0.0
clc;
clear ;
//given
Pin=0.1E-6;//Average input power in W
lambda=1550;//Operating wavelength in nm
R=1;//Responsivity of an MF-432 PIN photodiode
Ip=R*Pin;//photocurrent in A
e=1.6E-19;//Electrons value in Coulomb
BWpd=2.5E+9;//Bandwidth of an MF-432 PIN photodiode in Hz
Is=sqrt(2*e*Ip*BWpd);
Isn=Is/sqrt(BWpd);//shot noise current in A/sqrt(Hz)
Kb=1.38E-23;//Boltzman constant in J/K
T=300;//Room temperature in K
P=Kb*T;
Rl=50E+3;
x=(4*P)/Rl;
It=sqrt(x*BWpd);
Itn=It/sqrt(BWpd);//thermal noise current in A/sqrt(Hz)
id=3E-9;//average dark noise current in A
Id=sqrt(2*e*id*BWpd);
Idn=Id/sqrt(BWpd);//dark noise current in A/sqrt(Hz)
Inoise=sqrt(Is^2+It^2+Id^2);//RMS value of noise current for an MF-432 PIN photodiode in A
mprintf("RMS value of noise current for an MF-432 PIN photodiode = %.1f nA", Inoise*1E+9);//Multiplication by 1e9 to convert unit from A to nA
InoiseN=sqrt(Isn^2+Itn^2+Idn^2);//Bandwidth value of noise current for an MF-432 PIN photodiode in A/sqrt(Hz)
mprintf("\nBandwidth value of noise current for an MF-432 PIN photodiode = %.2f x10^-4 nA/sqrt(Hz)", InoiseN*1E+13)
//Multiplication by 1e12 to convert unit from A to pA
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