This study of the reliability of 1.3-μm double heterojunction edge-emitting LED\´s indicates that edge-emitting LED\´s mounted with Au
0.8Sn
0.2solder have an activation energy of 0.9 eV for degradation and extrapolated lifetimes of

h at room temperature. A study of 1.3-μm LED\´s grown by LPE and VPE show them to be comparable in operating life. The temperature dependence of the light output (

) of the edge-emitting LED\´s is given by

(

K). The study also showed that lattice mismatch up to 0.31 percent at the InGaAsP/InP heterojunction does not effect reliability.