The frequency-modulated continuous wave (FMCW) light detection and ranging (LiDAR) is a powerful tool for measuring long distance and velocity. However, its in-plane spatial resolution or frame rate is inherently limited by the round-trip time of light. We propose a parallel operation of FMCW LiDAR using the wavelength division multiplexing and Pound–Drever–Hall (PDH) technique without sacrificing optical power and clarity of control. As proof of concept, two laser diodes are wavelength multiplexed, and their lasing frequencies are simultaneously modulated by PDH error signals generated using a scanning Fabry–Perot interferometer. The two parallel three-dimensional measurements successfully generated a doubled spatial resolution of FMCW LiDAR.
Nobuhide Yokota (Thu,) studied this question.