Mode field converter integrated GaInAsP laser diodes with monitoring photodiodes through semiconductor/air Bragg reflector

Mode field converter (MFC) integrated 1.3 μm GaInAsP laser diode with a monitoring photodiode through a semiconductor/air Bragg reflector (SABAR) has been successfully demonstrated. Instead of conventional cleavage, the SABAR can provide not only Fabry-Perot resonance with high reflectivity, but also possibility of integration of laser with the other functional devices. We have obtained a threshold current of 22 mA in the followed laser structure (L=270 μm, W=7 μm, SABAR pairs N=1), and detector photocurrent of 1.13 mA (@5 mW). The experimental SABAR reflectivity is 50%, which is estimated by threshold characteristics and efficiency of light output power. The laser has a mode field converter (MFC) section, resulting in narrow beam divergence 11° along vertical axis. This integrated laser is very promising candidate for coming optical module in low power consumption and low cost access network systems