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+
+//OptoElectronics and Fibre Optics Communication, by C.K Sarkar and B.C Sarkar
+//Example 6.4
+//OS=Windows 10
+////Scilab version Scilab 6.0.0-beta-2(64 bit)
+clc;
+clear;
+
+//given
+BER=1e-6;// a bit error
+T=400;//temperature in kelvin
+Rl=50;//load resistance in ohms
+R=0.4//responsivity in A/W
+K=1.38*1e-23//boltzman constant in SI units
+B=1e7//bandwidth in Hz
+u=4*(K)*T*B;
+is=9.56*sqrt(u/Rl);//current in Ampere
+Pmin=is/R;//minimum power required to maintain a bit error
+mprintf("The minimum power required to maintain a bit error=%.3f uW",Pmin*1e6);
+//The answer vary due to rounding
+// the question no. in book is wrong there is repeat of 8.4