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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