Swept Source Lidar: simultaneous FMCW ranging and nonmechanical beam steering with a wideband swept source

Okano, Masayuki; Chong, Changho

doi:10.1364/oe.396707

Cited by 96 publications

(40 citation statements)

References 25 publications

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“…Since high-speed detection is required in several fields, the high-speed modulation technique has been continuously investigated and developed. Thus, the swept-source has the potential of being used as a probing light source for fast noncontact PAM due to the sweeping rate in the order of MHz [ [151] , [152] , [153] , [154] ].…”

Section: Fast Photoacoustic Microscopy As a Function Of Light Source Speedmentioning

confidence: 99%

High-speed photoacoustic microscopy: A review dedicated on light sources

Cho

Park

et al. 2021

Photoacoustics

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In recent years, many methods have been investigated to improve imaging speed in photoacoustic microscopy (PAM). These methods mainly focused upon three critical factors contributing to fast PAM: laser pulse repetition rate, scanning speed, and computing power of the microprocessors. A high laser repetition rate is fundamentally the most crucial factor to increase the PAM speed. In this paper, we review methods adopted for fast PAM systems in detail, specifically with respect to light sources. To the best of our knowledge, ours is the first review article analyzing the fundamental requirements for developing high-speed PAM and their limitations from the perspective of light sources.

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Section: Fast Photoacoustic Microscopy As a Function Of Light Source Speedmentioning

confidence: 99%

High-speed photoacoustic microscopy: A review dedicated on light sources

Cho

Park

et al. 2021

Photoacoustics

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“…2D beamsteering can be achieved by diffractive element and wavelengthswept laser source. In our system, BSAs consist of a grating and a galvo scanning mirror [7,27]. Before steering signal beams to the receiver aperture, the localization of user terminals is required for establishment of transmission link.…”

Section: Architecture Of Lidar Integrated Infrared Owc Systemmentioning

confidence: 99%

LiDAR Integrated High-Capacity IR OWC System with Abilities of Localization and Link Alignment

Zhi¹

2021

Preprint

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By using narrow infrared (IR) beams, optical wireless communication (OWC) system can realize ultra-high capacity and high-privacy transmission. However, due to the point-to-point connection approach, a high-accuracy localization system and beam-steering antenna (BSA) are required to steer the signal beam to user terminals. In addition, to achieve link alignment in the receiver, the BSA needs to be within the limited receiver field of view (FoV). This problem greatly limits the practical application of high-capacity IR optical wireless communication and has not been well solved yet. In this paper, we proposed an indoor beam-steering IR OWC system with high-accuracy and calibration-free localization ability by employing a coaxial frequency modulated continuous wave (FMCW) light detection and ranging (LiDAR) system. In the meantime, benefit from the mm-level ranging accuracy of the LiDAR system, a feasible approach to deal with the link alignment issue for practical applications is firstly demonstrated. With the assistance of the LiDAR system, we experimentally achieved the localization of user terminals with a 0.038-degree localization accuracy, link alignment at the receiver and an error-free on-off keying (OOK) downlink transmission of 20 Gb/s in free space at 3-m distance is demonstrated.

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“…This section provides a system that uses DDC technology and a lower spec FFT module to reduce the hardware burden that can be displayed on the FMCW LiDAR system. In this paper, we will cite various FMCW LiDAR systems that have been studied in the past, and proceed with the explanation of the system on the assumption that the reflected signal inside the system is received and the beat frequency is generated [18,19].…”

Section: Proposed Systemmentioning

confidence: 99%

FMCW LiDAR System to Reduce Hardware Complexity and Post-Processing Techniques to Improve Distance Resolution

Kim

Jung

Lee

2020

Sensors

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As the autonomous driving technology develops, research on related sensors is also being actively conducted. One system that is widely used today uses a light source with a wavelength in the 905 nm band for the pulse Light Detection And Ranging (LiDAR) system. This has the disadvantages of being harmful to the human eye and in making digital signal processing difficult at high sampling rates. The Frequency Modulated Continuous Wave (FMCW) LiDAR system has been proposed as an alternative. However, the FMCW LiDAR is formed with a high beat frequency by a method different from that of the FMCW Radar, which causes a hardware burden on the FFT (Fast Fourier Transform) module for interpreting the beat frequency information. In this paper, the FFT module that may occur in the FMCW LiDAR using Digital Down Convert (DDC) technology is extracted at 256 points, which is 25 times smaller than the existing 8192 points, and the beat frequency is 0 to 50 m at 3 cm intervals. As a result of generating and restoring the distance, the performance of 0.03 m Root Mean Square Error (RMSE) compared to the conventional one was confirmed. In this process, the hardware module was directly mounted and verified on the FPGA. In the case of the Simple Threshold-Constant False Alarm Rate (ST-CFAR) provided, the RMSE was measured by generating beat frequencies from 0 to 50 m at 1 cm intervals, and as a result, the result of 0.019 m was confirmed at 0.03 m in the past.

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Swept Source Lidar: simultaneous FMCW ranging and nonmechanical beam steering with a wideband swept source

Cited by 96 publications

References 25 publications

High-speed photoacoustic microscopy: A review dedicated on light sources

High-speed photoacoustic microscopy: A review dedicated on light sources

LiDAR Integrated High-Capacity IR OWC System with Abilities of Localization and Link Alignment

FMCW LiDAR System to Reduce Hardware Complexity and Post-Processing Techniques to Improve Distance Resolution

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