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+
+//OptoElectronics and Fibre Optics Communication, by C.K Sarkar and B.C Sarkar
+//Example 5.6
+//OS=Windows 10
+////Scilab version Scilab 6.0.0-beta-2(64 bit)
+clc;
+clear;
+
+//given
+T1=273+20;//first temperature for an AlGaAs injection laser diode in kelvin
+T2=273+80;//second temperature for an AlGaAs injection laser diode in kelvin
+T01=160;//first thershold temperature in kelvin
+T02=55;//second thershold temperature in kelvin;
+
+//case 1:
+Jth120C=exp(T1/T01);
+Jth180C=exp(T2/T01);
+Jth1=Jth180C/Jth120C;
+mprintf("\n The ratio of threshold current densities for AlGaAs=%.2f",Jth1);//the answer vary due to rounding
+
+//case 2:
+Jth220C=exp(T1/T02);
+Jth280C=exp(T2/T02);
+Jth2=Jth280C/Jth220C;
+mprintf("\n The ratio threshold current densities for InGaAs=%.2f",Jth2);