Optimization of 10-20 GHz avalanche photodiodes

Calculations are presented on the optimization of the high-frequency response of superlattice and bulk avalanche photodiodes (APD's). The thickness of the avalanche and absorption regions, as well as the electric fields in these layers are optimized, as is the hetero-interface field. We find that high-performance APD's operating up to 20 GHz are feasible.