Provided is a semiconductor opto-electronic device that may comprise an active layer including a quantum well and a barrier layer on a substrate, upper and lower waveguide layers on and underneath the active layer, respectively, and upper and lower clad layers on and underneath the upper and lower waveguide layers, respectively. The semiconductor opto-electronic device may further comprise an upper optical confinement layer (OCL) between the active layer and the upper waveguide layer 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 barrier layer, and a lower OCL between the active layer and the lower waveguide layer 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 barrier layer. Also provided is a method of fabricating the semiconductor opto-electronic device.

 
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