Enhanced Velocity Sensitivity in 4-D FMCW LiDAR by Use of Avalanche Photodiode with Cascaded Multiplication Layer

Abstract

A 4-D FMCW LiDAR is demonstrated. In comparison to the traditional p-i-n PD in its receiver-side, the cascaded M-layers APDs provide a better quality of 4-D images with unprecedented high velocity- sensitivity (5µm/sec) for slow-moving objects.