Overall Non-Mechanical Spectrally Steered LiDAR Using Chirped Amplitude-Modulated Phase-Shift Method

We propose and demonstrate an overall non-mechanical spectrally steered laser rangefinder using the dispersion-tuned swept laser (DTSL) and a passive diffractive element. The DTSL has no mechanical moving parts, making it possible to achieve an inertial-free high wavelength sweeping speed. The inher...

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Bibliographic Details
Published in:Journal of lightwave technology 2022-04, Vol.40 (7), p.1902-1913
Main Authors: Zhang, Zheyuan, Zhang, Chao, Shirahata, Takuma, Yamashita, Shinji, Set, Sze Y.
Format: Article
Language:English
Subjects:
Amplitudes
Chirp
Continuous radiation
Detection algorithms
Erbium-doped fiber amplifiers
Frequency modulation
Laser beams
Laser radar
Laser range finders
Lidar
Measurement by laser beam
Modulation
object detection
Phase shift
Pulse repetition rate
Signal processing
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Summary:We propose and demonstrate an overall non-mechanical spectrally steered laser rangefinder using the dispersion-tuned swept laser (DTSL) and a passive diffractive element. The DTSL has no mechanical moving parts, making it possible to achieve an inertial-free high wavelength sweeping speed. The inherent intensity-modulation characteristic of the DTSL allows the modulation phase-shift method to be applied, similar to that used for an amplitude-modulated continuous-wave (AMCW) rangefinder. Since the pulse repetition rate of the DTSL is chirped, standard signal processing techniques for AMCW are not applicable. In this paper, we propose a novel chirped amplitude-modulated phase-shift (CAMPS) method with a signal processing technique to obtain the phase-shift information from a chirped amplitude-modulated signal. As a proof of concept, we demonstrated the CAMPS LiDAR with an axial ranging resolution of ∼50 μm at a scanning speed of 10 kHz.
ISSN:0733-8724
1558-2213
DOI:10.1109/JLT.2021.3131027