High-Resolution Frequency-Modulated Continuous-Wave LiDAR via 64-Element Fiber Laser Phased Arrays

The increasing demand for long-range, high-resolution detection and high beam steering rate in optical sensors is driving the rapid advancement of light detection and ranging (LiDAR) architectures. A variety of LiDAR technologies have been developed, each targeting specific applications with varying degrees of success. However, LiDAR systems have been challenged by requirements on achieving long-range and high-precision distance detection, simultaneously. Frequency-modulated continuous-wave (FMCW) LiDAR employs the beat frequency signal, generated by transmitting and receiving chirped signals, to map distance-frequency relationship. Coherent beam combining (CBC) technology demonstrates high-power output and enables high-speed beam steering through fully electronic control. In this work, we present a LiDAR system that integrates a 64-Element two-dimensional fiber laser phased arrays (FLPA) based on CBC technology with FMCW. We conducted ranging experiments at a distance of 2.35 and 3.45 m with a resolution level of 0.26 m. This LiDAR can effectively enhance the imaging resolution and detection range by increasing the number of elements in the FLPA.