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Modeling of waveguide-separated absorption charge multiplication-avalanche photodetector (WG-SACM-APD)

Waveguide photodetectors (WGPDs) are promising candidates for high-speed applications because in this kind of photodetector, the bandwidth-efficiency trade-off that is found in the design of conventional photodetectors is solved. In this paper, we present a physics-based model of the waveguide-separated absorption charge multiplication-avalanche photodetector (WG-SACM-APD). In the presented model, both of the frequency response and the gain-bandwidth characteristics of this photodetector have been studied and calculated for different thicknesses of the absorption and multiplication layers, different areas of the photodetector and different values of the multiplication showing the dependence of the performance of the photodetector on the dimensions, the material parameters and the multiplication gain. In addition, the characteristics of WG-SACM-APD are studied for the case of an inductor added in series to the load resistor and better performance is achieved in comparison to the case with no inductor. The results obtained from the model that is presented in this work are compared with published experimental results and good agreement has been obtained.