Monolithic integration of In 0.2 Ga 0.8 Asvertical-cavity surface-emitting lasers with resonance-enhanced quantum well photodetectors

Vertical-cavity surface-emitting lasers (VCSELs) have been monolithically integrated with resonance-enhanced photo-detectors (REPDs) using a single epilayer design, to produce a simple array of sources and detectors for optical interconnect applications. The detectors, which contain a three quantum well InGaAs absorption region, achieve quantum efficiencies as high as 85%, and the VCSELs achieved threshold current densities as low as 850 A/cm2 and differential quantum efficiencies as high as 50%.