Linearization of wavelength sweeping lasers for the construction of 4-D FMCW LiDAR images of slow-moving objects using baseband beat note signals

A FMCW LiDAR system of both the distributed feedback laser and external cavity laser is established in baseband beat notes, rather than up-conversion to an intermediate frequency to exclude flicker noise. Meanwhile, utilizing fast-scanning MEMS mirrors, high-quality real-time (1 fps) 4-D images of t...

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Published inOptics express Vol. 32; no. 11; pp. 20401 - 20411
Main Authors Tsai, Yu-Kuan, Liao, Zheng-Xiang, Lin, Yu-Xiang, Chen, H-S, Huang, Jack Jia-Sheng, Wang, Pei-Hsun, Wei, Chia-Chien, Chang, You-Chia, Hung, Yung, Shi, Jin-Wei
Format Journal Article
LanguageEnglish
Published United States 20.05.2024
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Summary:A FMCW LiDAR system of both the distributed feedback laser and external cavity laser is established in baseband beat notes, rather than up-conversion to an intermediate frequency to exclude flicker noise. Meanwhile, utilizing fast-scanning MEMS mirrors, high-quality real-time (1 fps) 4-D images of the slow-moving object (10 mm/s) can be directly constructed at the baseband with a central frequency as low as 100 kHz and a small Doppler shift. The proposed LiDAR architecture based on such a low-frequency baseband significantly improves the optical power budget on the transmitter side and eliminates the costly high-speed sampling circuits on the receiver side.
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ISSN:1094-4087
1094-4087
DOI:10.1364/OE.524443