High-speed waveguide-integrated Ge/Si avalanche photodetector
Cong Hui, Xue Chunlai†, , Liu Zhi, Li Chuanbo, Cheng Buwen, Wang Qiming
       

(a) The schematic configuration of an evanescently coupled waveguide APD; (b) the schematic configuration of an SACM Ge/Si APD.