High Precision Range Extracting Method for FMCW LiDAR Using Semiconductor Laser Based on EO-PLL and NUDFT

Tao Xue; Jingyang Liu; Cheng Lu; Guodong Liu

doi:10.3390/photonics12050466

High Precision Range Extracting Method for FMCW LiDAR Using Semiconductor Laser Based on EO-PLL and NUDFT

Tao Xue
, Jingyang Liu
, Cheng Lu^*
, Guodong Liu

^*Corresponding author for this work

School of Instrumentation Science and Engineering

Harbin Institute of Technology

Research output: Contribution to journal › Article › peer-review

1 Scopus citations

Abstract

Frequency tuning nonlinearities in semiconductor lasers constitute a critical factor that degrades measurement precision and spectral resolution in frequency-modulated continuous-wave (FMCW) LiDAR systems. This study systematically investigates the influence of nonlinear beat signal phase distortions on spectral peak broadening and develops a phase-fitting-based pre-correction algorithm. To further enhance system performance, an electro-optic phase-locked loop architecture combined with non-uniform discrete Fourier transform signal processing is implemented, establishing a comprehensive solution for tuning nonlinearity suppression. Experimental validation demonstrates a sub-18 µm standard deviation in absolute distance measurements at a 19 m target range. This integrated approach represents a significant advancement in coherent frequency-sweep detection methodologies, offering considerable potential for high-precision photonic radar applications.

Original language	English
Article number	466
Journal	Photonics
Volume	12
Issue number	5
DOIs	https://doi.org/10.3390/photonics12050466
State	Published - May 2025

Keywords

FMCW
electro-optic phase-locked loop
non-uniform discrete Fourier transform
semiconductor laser

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10.3390/photonics12050466

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@article{29b5eac24e8a482d88ef5d7fe43c2f77,

title = "High Precision Range Extracting Method for FMCW LiDAR Using Semiconductor Laser Based on EO-PLL and NUDFT",

abstract = "Frequency tuning nonlinearities in semiconductor lasers constitute a critical factor that degrades measurement precision and spectral resolution in frequency-modulated continuous-wave (FMCW) LiDAR systems. This study systematically investigates the influence of nonlinear beat signal phase distortions on spectral peak broadening and develops a phase-fitting-based pre-correction algorithm. To further enhance system performance, an electro-optic phase-locked loop architecture combined with non-uniform discrete Fourier transform signal processing is implemented, establishing a comprehensive solution for tuning nonlinearity suppression. Experimental validation demonstrates a sub-18 µm standard deviation in absolute distance measurements at a 19 m target range. This integrated approach represents a significant advancement in coherent frequency-sweep detection methodologies, offering considerable potential for high-precision photonic radar applications.",

keywords = "FMCW, electro-optic phase-locked loop, non-uniform discrete Fourier transform, semiconductor laser",

author = "Tao Xue and Jingyang Liu and Cheng Lu and Guodong Liu",

note = "Publisher Copyright: {\textcopyright} 2025 by the authors.",

year = "2025",

month = may,

doi = "10.3390/photonics12050466",

language = "英语",

volume = "12",

journal = "Photonics",

issn = "2304-6732",

publisher = "Multidisciplinary Digital Publishing Institute (MDPI)",

number = "5",

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TY - JOUR

T1 - High Precision Range Extracting Method for FMCW LiDAR Using Semiconductor Laser Based on EO-PLL and NUDFT

AU - Xue, Tao

AU - Liu, Jingyang

AU - Lu, Cheng

AU - Liu, Guodong

PY - 2025/5

Y1 - 2025/5

N2 - Frequency tuning nonlinearities in semiconductor lasers constitute a critical factor that degrades measurement precision and spectral resolution in frequency-modulated continuous-wave (FMCW) LiDAR systems. This study systematically investigates the influence of nonlinear beat signal phase distortions on spectral peak broadening and develops a phase-fitting-based pre-correction algorithm. To further enhance system performance, an electro-optic phase-locked loop architecture combined with non-uniform discrete Fourier transform signal processing is implemented, establishing a comprehensive solution for tuning nonlinearity suppression. Experimental validation demonstrates a sub-18 µm standard deviation in absolute distance measurements at a 19 m target range. This integrated approach represents a significant advancement in coherent frequency-sweep detection methodologies, offering considerable potential for high-precision photonic radar applications.

AB - Frequency tuning nonlinearities in semiconductor lasers constitute a critical factor that degrades measurement precision and spectral resolution in frequency-modulated continuous-wave (FMCW) LiDAR systems. This study systematically investigates the influence of nonlinear beat signal phase distortions on spectral peak broadening and develops a phase-fitting-based pre-correction algorithm. To further enhance system performance, an electro-optic phase-locked loop architecture combined with non-uniform discrete Fourier transform signal processing is implemented, establishing a comprehensive solution for tuning nonlinearity suppression. Experimental validation demonstrates a sub-18 µm standard deviation in absolute distance measurements at a 19 m target range. This integrated approach represents a significant advancement in coherent frequency-sweep detection methodologies, offering considerable potential for high-precision photonic radar applications.

KW - FMCW

KW - electro-optic phase-locked loop

KW - non-uniform discrete Fourier transform

KW - semiconductor laser

UR - https://www.scopus.com/pages/publications/105006734317

U2 - 10.3390/photonics12050466

DO - 10.3390/photonics12050466

M3 - 文章

AN - SCOPUS:105006734317

SN - 2304-6732

VL - 12

JO - Photonics

JF - Photonics

IS - 5

M1 - 466

ER -

High Precision Range Extracting Method for FMCW LiDAR Using Semiconductor Laser Based on EO-PLL and NUDFT

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Keywords

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