High performance mode field converter GaInAsP laser integrated with improved butt-coupled passive waveguide

We have demonstrated integration of mode field converter (MFC) GaInAsP laser with butt-coupled passive waveguide. High coupling efficiency of 96% at the butt-junction was achieved using an improved SiN mask for selective MOCVD growth. Threshold current as low as 2.2 mA and vertical beam divergence as narrow as 12/spl deg/ could be achieved. This integrated laser is very promising candidate for coming optical module in low power consumption and low cost optical network systems.