Very high-responsivity evanescently coupled photodiodes integrating a short planar multimode waveguide for high-speed applications

We report an evanescently coupled photodiode that utilizes a short planar multimode waveguide. Very high responsivity (> 1 A/W) with polarization dependence less than 0.5 dB, 48-GHz bandwidth, and 11-mA saturation current were achieved.