Room-temperature bandwidth of 2-mu m AlInAsSb avalanche photodiodes

We investigate the room-temperature bandwidth performance of AlInAsSb avalanche photodiodes under 2-mu m illumination. Parameter characterization denotes RC-limited performance. While measurements indicate a maximum gain-bandwidth product of 44 GHz for a 60-mu m-diameter device, we scale this performance to smaller device sizes based on the RC response. For a 15-mu m-diameter device, we predict a maximum gain-bandwidth product of approximately 144 GHz based on the reported measurements. (C) 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement.