Impact of Laser Phase Noise on Ranging Precision Within and Beyond Laser Coherence Length in FMCW LiDAR

Yi, Wenting; Zhou, Zichuan; Liu, Zhixin; Bayvel, Polina; Killey, Robert I.

doi:10.1364/ofc.2023.m3f.3

Cited by 2 publications

(1 citation statement)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It should be acknowledged that the precision will rapidly deteriorate as the detection range approaches the coherence length, rendering it challenging to precisely detect longer targets. In terms of precision, the theoretical calculations [ 33 ] indicate that our FMCW laser is better than a fully linear FMCW laser with 300 kHz linewidth (σ = 5 cm@ 200 m). Compared with the others' prior works [ 9,21,24,31,32 ] in Table 2 , this work focuses on achieving the highly linear FMCW ranging system (RMS = 171 kHz) over a wide wavelength tuning range (68 nm).…”

Section: Discussionmentioning

confidence: 99%

Highly‐Linear and Wavelength‐Tunable Frequency‐Modulated Continuous‐Wave Hybrid‐Integrated Laser

Liu,

Guo,

et al. 2024

Laser & Photonics Reviews

View full text Add to dashboard Cite

Frequency‐sweeping laser sources play a critical role in the accurate 3D mapping of frequency‐modulated continuous‐wave (FMCW) LiDAR systems, whose chirp linearity greatly impacts the measurement precision. Although various pre‐distortion algorithms have been proposed to reduce chirp nonlinearity, these open‐loop methods can rapidly suppress the chirp nonlinearity but they are susceptible to environmental variations and often exhibit subpar performance in long‐range detection scenarios. In contrast, the electro–optical phase‐locked loop (EO‐PLL) serves as a real‐time linearizing solution for FMCW LiDAR, enabling high‐precision, high‐resolution, and long‐distance measurement capabilities. In this study, a III/V‐Si3N4 hybrid‐integrated external cavity laser (ECL) is used to generate an FMCW signal over a large wavelength tuning range of 68 nm. The maximum output optical power is 15.8 mW, and the intrinsic linewidth is 0.9 kHz. By modulating the phase shifter, an FMCW signal with a chirp bandwidth of 0.7 GHz is generated at a repetition rate of 1 kHz. The pre‐distortion algorithm is combined with the gain‐tunable EO‐PLL system to suppress the chirp nonlinearity and frequency noise across multiple wavelengths, leading to a remarkable improvement in range precision from 202 to 4.2 cm when targeting a distance of 200 m.

show abstract

Section: Discussionmentioning

confidence: 99%

Highly‐Linear and Wavelength‐Tunable Frequency‐Modulated Continuous‐Wave Hybrid‐Integrated Laser

Liu,

Guo,

et al. 2024

Laser & Photonics Reviews

View full text Add to dashboard Cite

show abstract

FMCW laser ranging breaks the coherence length limitation via phase noise cancellation

Sun,

Hu,

et al. 2023

2023 International Topical Meeting on Microwave Photonics (MWP)

View full text Add to dashboard Cite

Impact of Laser Phase Noise on Ranging Precision Within and Beyond Laser Coherence Length in FMCW LiDAR

Abstract: We study the impact of laser phase noise on ranging precision in a frequency-modulated continuous-wave (FMCW) LiDAR system, demonstrating ranging of 384.72 m with ~ 15 cm precision at 7 × intrinsic laser coherence length.

Cited by 2 publications

References 6 publications

Highly‐Linear and Wavelength‐Tunable Frequency‐Modulated Continuous‐Wave Hybrid‐Integrated Laser

Highly‐Linear and Wavelength‐Tunable Frequency‐Modulated Continuous‐Wave Hybrid‐Integrated Laser

FMCW laser ranging breaks the coherence length limitation via phase noise cancellation

Contact Info

Product

Resources

About