Electro-optic comb-enabled precise ambiguity-free distance measurement with 10-kHz acquisition rate

Yifan Qi; Xingyu Jia; Jingyi Wang; Xinlun Cai; Guanhao Wu; Yang Li

doi:10.1117/12.3000711

9 March 2024 Electro-optic comb-enabled precise ambiguity-free distance measurement with 10-kHz acquisition rate

Yifan Qi, Xingyu Jia, Jingyi Wang, Xinlun Cai, Guanhao Wu, Yang Li

Proceedings Volume PC12890, Smart Photonic and Optoelectronic Integrated Circuits 2024; PC128900S (2024) https://doi.org/10.1117/12.3000711
Event: SPIE OPTO, 2024, San Francisco, California, United States

Abstract

With the blooming of artificial intelligence technology, the distant sensing systems with an agile deployment, a high refreshing rate and a high precision are demanded to map the fast-changing environment in terms of 3D point cloud for autonomous vehicles and smart home products. Frequency modulated continuous wave (FMCW), as a coherent detection method, shows a high precision, a high selectivity against ambient light, the intrinsic capability in speed sensing and eye-safety. However, FMCW usually needs a discrete Fourier transform to resolve the distance from the beating between the transmitted and received signals, leading to limitation on the acquisition rate and higher requirement in the frequency chirping span, speed, and linearity of the FMCW laser. Here we demonstrate an electro-optic comb-enabled absolute distance ranging technology with an acquisition rate up to 10 kHz and a precision better than 100 mm. We show that real-time distance resolving can be achieved with only two adjacent interference peaks among many peaks generated over one modulation frequency chirping period, boosting the acquisition rate of LiDAR system for ambiguity-free distance measurement.

Conference Presentation

Citation Download Citation

Yifan Qi, Xingyu Jia, Jingyi Wang, Xinlun Cai, Guanhao Wu, and Yang Li "Electro-optic comb-enabled precise ambiguity-free distance measurement with 10-kHz acquisition rate", Proc. SPIE PC12890, Smart Photonic and Optoelectronic Integrated Circuits 2024, PC128900S (9 March 2024); https://doi.org/10.1117/12.3000711

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