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+
+//Optoelectronics and Fiber Optics Communication by C.R. Sarkar and D.C. Sarkar

+//Example 4.1

+//OS = Windows 7

+//Scilab version 5.5.2

+

+clc;

+clear;

+

+//given

+h=6.62*10^-34;//Plank's constant in SI units

+c=3*10^8;//speed of the light in m/s

+e=1.9*10^-19;//electric charge in columb

+I=50*10^-3;//drive current in A

+lamda=0.85*10^-6;//peak emission wavelength in m

+taur=50*10^-9;//radiative carrier life time in s

+taunr=100*10^-9;//nonradiative carrier life time in s

+Tp=(taur*taunr)/(taur+taunr);///total carrier life time in s

+etaint=Tp/taur;//equation of internal efficiency

+c1=(I*h*c)/(e*lamda);//constant value

+Pint=(etaint)*c1;//internal optical power generated in W

+mprintf("\n Total carrier life time is =%.2fns ",Tp*1e9);//multiplication by 1e9 for conversion of unit from s to ns

+mprintf("\n Optical power generated internally is= %.2f mW ",Pint*1e3);//multiplication by 1e3 for conversion of unit from W to mW//the answer vary due to rounding