InP-based 1.55 µm waveguide-integrated photodetectors for high-speed applications

The paper reviews key characteristics of ultra fast evanescently coupled waveguide-integrated p-i-n photodetectors for 1.55µm wavelength. In detail, a highly efficient 100 GHz photodetector module and a low-capacitance miniaturized photodiode with 120 GHz bandwidth employing an optical matching layer for enhanced responsivity are reported. Furthermore, recent results on monolithically integrated traveling wave photodetectors based on discrete miniaturized photodiodes with parallel optical feed are presented.