Fig. 2: TEM characterization of the epitaxial structure grown on InP and InPOS.

Cross-sectional TEM images of AlGaInAs MQW laser structures on (a) bulk InP and (b) InPOS. STEM images of entire MQW structures on (c) bulk InP and (e) InPOS. The amplified QW structures on (d) bulk InP and (f) InPOS