Patent ID: 8050305

Claim:
A semiconductor device comprising: an InP substrate; a cladding layer carried on the substrate; and an active region layer between the cladding layer and the substrate; wherein, the cladding layer is a p-type semiconductor layer, the p-type semiconductor layer has a laminate structure of alternate layers of a first semiconductor layer mainly including Be x1 Mg x2 Zn x3 Te (0<x1<1, 0≦x2<1, 0<x3<1, x1+x2+x3=1) and a second semiconductor layer mainly including Be x4 Mg x5 Zn x6 Te (0<x4<1, 0<x5<1, 0≦x6<1, x4+x5+x6=1), and the second semiconductor layer is lattice-matched to the InP substrate.