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    Techniques for improving SNR in a FMCW LiDAR system using a coherent receiver
    2.
    发明授权
    Techniques for improving SNR in a FMCW LiDAR system using a coherent receiver 有权

    公开(公告)号：US11662444B1

    公开(公告)日：2023-05-30

    申请号：US17875325

    申请日：2022-07-27

    Applicant: AEVA, INC.

    Inventor： Ryan Wayne Going ,  Kumar Bhargav Viswanatha ,  Pradeep Srinivasan ,  Srikanth Kuthuru

    IPC: G01S7/4912 ,  G01S7/481

    CPC classification number: G01S7/4917 ,  G01S7/4817

    Abstract: The LiDAR system includes a coherent receiver disposed in a reference path. The coherent receiver includes a 90° optical hybrid to receive a portion of an optical beam along the reference path and a local oscillator (LO) signal to generate multiple output signals. The coherent receiver includes a first photodetector to receive a first and a second output signal to generate a first mixed signal, and a second photodetector to receive a third and a fourth output signal to generate a second mixed signal. The LiDAR system further includes a processor to combine the first mixed signal and the second mixed signal to generate a combined reference signal to suppress a negative image of a reference beat frequency signal to estimate a phase noise of the optical source to determine range and velocity information of the target.

    Techniques for mitigating lag-angle effects for LIDARs scans
    4.
    发明授权
    Techniques for mitigating lag-angle effects for LIDARs scans 有权

    公开(公告)号：US11105904B1

    公开(公告)日：2021-08-31

    申请号：US17086266

    申请日：2020-10-30

    Applicant: AEVA, INC.

    Inventor： Ehsan Hamidi ,  Behsan Behzadi ,  Pradeep Srinivasan ,  Mina Rezk

    IPC: G01C3/08 ,  G01S7/4915 ,  G01S7/481 ,  G01S7/4913

    Abstract: A LIDAR system includes an optical source and multiple waveguides at different positions within the LIDAR system to receive a return signal. A first waveguide receives a first portion of the return signal at a first angle relative to the scanning mirror and a second waveguide receives a second portion of the return signal at a second angle relative to the scanning mirror. The system further includes multiple optical detectors at different positions within the LIDAR system. A first optical detector receives the first portion of the return signal from the first waveguide and a second optical detector receives the second portion of the return signal from the second waveguide. The system further includes a signal processing system operatively coupled to the plurality of optical detectors to determine a distance and velocity of the target object based on the returned signal and corresponding positions of the plurality of waveguides.

    Techniques for using a coherent receiver in a FMCW LiDAR system
    6.
    发明授权
    Techniques for using a coherent receiver in a FMCW LiDAR system 有权

    公开(公告)号：US12025750B2

    公开(公告)日：2024-07-02

    申请号：US18139267

    申请日：2023-04-25

    Applicant: AEVA, INC.

    Inventor： Ryan Wayne Going ,  Kumar Bhargav Viswanatha ,  Pradeep Srinivasan ,  Srikanth Kuthuru

    IPC: G01S7/4912 ,  G01S7/481

    CPC classification number: G01S7/4917 ,  G01S7/4817

    Abstract: The LiDAR system includes a coherent receiver disposed in a reference path. The coherent receiver includes a 90° optical hybrid to receive a portion of an optical beam along the reference path and a local oscillator (LO) signal to generate multiple output signals. The coherent receiver includes a first photodetector to receive a first and a second output signal to generate a first mixed signal, and a second photodetector to receive a third and a fourth output signal to generate a second mixed signal. The LiDAR system further includes a processor to combine the first mixed signal and the second mixed signal to generate a combined reference signal. A negative image of a reference beat frequency signal produced by the optical beam and the LO signal is suppressed to estimate a phase noise of the optical source to determine at least one of range or velocity information of the target.

    TECHNIQUES FOR USING A COHERENT RECEIVER IN A FMCW LIDAR SYSTEM
    7.
    发明公开
    TECHNIQUES FOR USING A COHERENT RECEIVER IN A FMCW LIDAR SYSTEM 审中-公开

    公开(公告)号：US20240036178A1

    公开(公告)日：2024-02-01

    申请号：US18139267

    申请日：2023-04-25

    Applicant: AEVA, INC.

    Inventor： Ryan Wayne Going ,  Kumar Bhargav Viswanatha ,  Pradeep Srinivasan ,  Srikanth Kuthuru

    IPC: G01S7/4912

    CPC classification number: G01S7/4917 ,  G01S7/4817

    Abstract: The LiDAR system includes a coherent receiver disposed in a reference path. The coherent receiver includes a 90° optical hybrid to receive a portion of an optical beam along the reference path and a local oscillator (LO) signal to generate multiple output signals. The coherent receiver includes a first photodetector to receive a first and a second output signal to generate a first mixed signal, and a second photodetector to receive a third and a fourth output signal to generate a second mixed signal. The LiDAR system further includes a processor to combine the first mixed signal and the second mixed signal to generate a combined reference signal. A negative image of a reference beat frequency signal produced by the optical beam and the LO signal is suppressed to estimate a phase noise of the optical source to determine at least one of range or velocity information of the target.

    FMCW LIDAR using array waveguide receivers and optical frequency shifting
    9.
    发明授权
    FMCW LIDAR using array waveguide receivers and optical frequency shifting 有权

    公开(公告)号：US11372105B1

    公开(公告)日：2022-06-28

    申请号：US17495665

    申请日：2021-10-06

    Applicant: AEVA, INC.

    Inventor： Brian J. Roxworthy ,  Pradeep Srinivasan ,  Ashwin Samarao

    IPC: G01S17/32 ,  G01S7/4913 ,  G01S7/481

    Abstract: A system including one or more waveguides to receive a first returned reflection having a first lag angle and generate a first waveguide signal, receive a second returned reflection having a second lag angle different from the first lag angle, and generate a second waveguide signal. The system includes one or more photodetectors to generate a first output signal within a first frequency range, and generate, based on the second waveguide signal and a second LO signal, a second output signal within a second frequency range. The system includes an optical frequency shifter (OFS) to shift a frequency of the second LO signal to cause the second output signal to shift from within the second frequency range to within the first frequency range to generate a shifted signal. The system includes a processor to receive the shifted signal to produce one or more points in a point set.

    Techniques for using a resonant photonic IQ modulator
    10.
    发明授权
    Techniques for using a resonant photonic IQ modulator 有权

    公开(公告)号：US11209677B1

    公开(公告)日：2021-12-28

    申请号：US17149280

    申请日：2021-01-14

    Applicant: AEVA, INC.

    Inventor： Brian J. Roxworthy ,  Pradeep Srinivasan

    IPC: G02F1/01 ,  G02F1/225 ,  G02F1/21 ,  G02B6/12 ,  G01S17/89

    Abstract: An interferometer comprises a plurality of waveguide branches, where each waveguide branch of the plurality of waveguide branches is disposed to shift a phase of a corresponding portion of the optical beam. Each waveguide branch comprises a bus waveguide and a photonic resonator coupled to the bus waveguide, where the photonic resonator is disposed proximate to the bus waveguide, and where the photonic resonator is disposed to couple and circle the corresponding portion of the optical beam, at the photonic resonator, one or more times to shift the phase of the corresponding portion of the optical beam.

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