Modeling and characterization of microwave p-i-n photodiode

A numerical one-dimensional drift-diffusion model of the p-i-n photodiode based on the InP/InGaAs/InGaAsP heterostructure which takes into account the influence of an external electric circuit and parasitic elements is presented. S/sub 11/ parameters of the photodiode are theoretically and experimentally investigated under illumination and in the frequency range up to 4 GHz. The theoretical data well correspond to the measured characteristics of the photodiode. This model can be used in the design of p-i-n photodiodes operating in microwave circuits.