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+//Fiber-optics communication technology, by Djafer K. Mynbaev and Lowell L. Scheiner 
+//Example 11.3.5
+//windows 7
+//Scilab version-6.0.0
+clc;
+clear ;
+//given
+
+BER=1E-9;//bit error rate
+Kb=1.38E-23;//Boltzman constant in J/K
+T=300;//Room temperature in K
+P=Kb*T;//constant
+Rl=50E+3;//load resistance in ohm
+x=(4*P)/Rl;//constant  
+BWpd=2.5e9//Bandwidth of MF-432 in Hz
+R=1//responsivity in A/W from data sheet
+It=sqrt(x*BWpd);
+Q=6;
+e=1.6E-19;//Electrons value in Coulomb
+
+Pmin=(It+e*Q*BWpd)*(Q/R);//The minimal optical power-photodiode sensitivity Pmin in W
+mprintf("The minimal optical power-photodiode sensitivity Pmin= %.2f dBm",10*log10(Pmin/1e-3));//the answer vary due to rounding//division by 1e-3 to convert unit from dB to dBm