Patent ID: 7724795

Claim:
A semiconductor opto-electronic device comprising: an active layer including at least one quantum well and at least one barrier layer on a substrate; upper and lower waveguide layers on and underneath the active layer, respectively; upper and lower clad layers on and underneath the upper and lower waveguide layers, respectively; an upper OCL (optical confinement layer) between the active layer and the upper waveguide layers and having an energy gap smaller than the energy gap of the upper waveguide layer and equal to or larger than the energy gap of the at least one barrier layer; and a lower OCL between the active layer and the lower waveguide layers and having an energy gap smaller than the energy gap of the lower waveguide layer and equal to or smaller than the energy gap of the at least one barrier layer, wherein the energy gap of the lower OCL is smaller than the energy gap of the upper OCL.