Integrated adaptive coherent LiDAR for 4D bionic vision

TL;DR

This paper introduces a bio-inspired, adaptive FMCW LiDAR system that mimics human vision, achieving high-resolution 4D imaging with dynamic focusing, scalable scanning, and multi-parameter sensing using hybrid integrated photonics.

Contribution

The work presents a novel chip-scale, adaptive LiDAR with dynamic zoom and multi-parameter fusion, surpassing traditional LiDAR resolution and capabilities.

Findings

Achieved 0.012-degree resolution, 15 times higher than conventional LiDAR.

Demonstrated 4D parallel imaging with 115 scanning lines.

Enabled high-resolution color-enhanced machine vision through sensor fusion.

Abstract

Light detection and ranging (LiDAR) is a ubiquitous tool to provide precise spatial awareness in various perception environments. A bionic LiDAR that can mimic human-like vision by adaptively gazing at selected regions of interest within a broad field of view is crucial to achieve high-resolution imaging in an energy-saving and cost-effective manner. However, current LiDARs based on stacking fixed-wavelength laser arrays and inertial scanning have not been able to achieve the desired dynamic focusing patterns and agile scalability simultaneously. Moreover, the ability to synchronously acquire multi-dimensional physical parameters, including distance, direction, Doppler, and color, through seamless fusion between multiple sensors, still remains elusive in LiDAR. Here, we overcome these limitations and demonstrate a bio-inspired frequency-modulated continuous wave (FMCW) LiDAR system with dynamic and scalable gazing capability. Our chip-scale LiDAR system is built using hybrid integrated photonic solutions, where a frequency-chirped external cavity laser provides broad spectral tunability, while on-chip electro-optic combs with elastic channel spacing allow customizable imaging granularity. Using the dynamic zoom-in capability and the coherent FMCW scheme, we achieve a state-of-the-art resolution of 0.012 degrees, providing up to 15 times the resolution of conventional 3D LiDAR sensors, with 115 equivalent scanning lines and 4D parallel imaging. We further demonstrate cooperative sensing between our adaptive coherent LiDAR and a camera to enable high-resolution color-enhanced machine vision.