Tapered Bragg reflection waveguide edge emitting lasers with near circular twin

An edge emitting laser with two symmetrical near-circular spots located far field (FF) is demonstrated using tapered double-sided Bragg reflection waveguides (BRWs). The BRWs consist of six pairs of top p-type and bottom n-type Al0.1 Ga0.9 As/Al0.3 Ga0.7As Bragg reflectors with a period thickness of