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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