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+//Fiber-optics communication technology, by Djafer K. Mynbaev and Lowell L. Scheiner 

+//Example 10.2.2

+//windows 7

+//Scilab version-6.0.0

+clc;

+clear ;

+//given

+

+//case 1

+lambda=840;//Operating wavelength in nm

+Eg=1248/lambda;//semiconductor bandgap in eV

+e=1.6E-19;//Electrons value in Coulomb

+V=Eg;//voltage in V

+R=1;//Reflectivity

+I=10E-3;//Current in A

+P1=I*I*R;

+P2=I*V;

+P3=P1+P2;

+Pout=1.25E-3;//Output power in W

+ETAp=Pout/P3;

+mprintf("Power Efficiency of a VCSEL diode = %.3f", ETAp);

+ETAP=ETAp*100;

+mprintf("\n Hence, Power Efficiency of a VCSEL diode = %.1f Percent ",ETAP);

+

+//case 2

+lambda2=1300;//Operating wavelength in nm

+Eg2=1248/lambda2;//semiconductor bandgap in eV

+e2=1.6E-19;//Electrons value in Coulomb

+V2=Eg2;//voltage in V

+R2=1.84;//Reflectivity

+I2=312E-3;//Current in A

+P11=I2*I2*R;

+P22=I2*V2;

+P33=P11+P22;

+Pout1=1E-3;//Output power in W

+ETAp1=Pout1/P33;

+mprintf("\nPower Efficiency of a broad area laser diode = %.3f", ETAp1);

+ETAP1=ETAp1*100;

+mprintf("\n Hence, Power Efficiency of a broad area laser diode = %.1f Percent ",ETAP1);//the answer vary due to rounding