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    PHOTONIC CIRCULATOR FOR A LIDAR DEVICE
    22.
    发明申请
    PHOTONIC CIRCULATOR FOR A LIDAR DEVICE 有权

    公开(公告)号：US20210124048A1

    公开(公告)日：2021-04-29

    申请号：US16814741

    申请日：2020-03-10

    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

    Inventor： Keyvan Sayyah ,  Raymond Sarkissian ,  Biqin Huang ,  Shuoqin Wang

    IPC: G01S17/10 ,  G01S7/481 ,  G01S17/931

    Abstract: An integrated photonic circulator is described, an application of which may be deployed on a chip-scale light-detection and ranging (LiDAR) device. The photonic circulator includes a micro-ring resonator waveguide, a heating element, first and second bus waveguides, a magneto-optic substrate, a magneto-optic element, a magnetic ring disposed on a photonic substrate, and a silicon substrate. The first and second bus waveguides are coupled to the micro-ring resonator waveguide, and the micro-ring resonator waveguide is affixed onto a first side of the photonic substrate. The magneto-optic element and the magneto-optic substrate are arranged on the micro-ring resonator waveguide, the magnetic ring is affixed to the magneto-optic substrate, the heating element is affixed to the photonic substrate, the photonic substrate is affixed to the silicon substrate, and the magnetic ring is concentric with the micro-ring resonator.

    APPARATUS AND SYSTEM FOR A LIDAR ANTENNA
    23.
    发明申请
    APPARATUS AND SYSTEM FOR A LIDAR ANTENNA 有权

    公开(公告)号：US20210124025A1

    公开(公告)日：2021-04-29

    申请号：US16814587

    申请日：2020-03-10

    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

    Inventor： Raymond Sarkissian ,  Keyvan Sayyah ,  Biqin Huang

    IPC: G01S7/481

    Abstract: An apparatus including a light detection and ranging (LiDAR) antenna of an optical phased array includes a silicon-on-insulator substrate including a silicon wire waveguide embedded within the substrate and a grating layer disposed over the substrate. The grating layer includes a silicon nitride layer coating the silicon-on-insulator substrate and including a plurality of etchings formed in a direction perpendicular to a longitudinal axis of the optical phased array and a silicon oxynitride layer coating the silicon nitride layer and filling the etchings. The etchings are relatively thin in the direction of the longitudinal axis of the optical phased array at a first end of the optical antenna and are relatively thick in the direction of the longitudinal axis at a second end. The etchings gradually increase in thickness between the first end of the optical phased array and the second end of the optical antenna.

    PHOTONIC CIRCULATOR FOR A LIDAR DEVICE
    24.
    发明申请
    PHOTONIC CIRCULATOR FOR A LIDAR DEVICE 有权

    公开(公告)号：US20210124024A1

    公开(公告)日：2021-04-29

    申请号：US16814575

    申请日：2020-03-10

    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

    Inventor： Raymond Sarkissian ,  Keyvan Sayyah ,  Biqin Huang ,  Ivan Alvarado ,  Shuoqin Wang

    IPC: G01S7/481 ,  G01S7/4912 ,  G01S7/4911

    Abstract: A photonic circulator deployed on a chip-scale light-detection and ranging (LiDAR) device includes a first arm that includes a first waveguide that is bonded onto a first member at a first bonding region, and a second arm that includes a second waveguide that is bonded onto a second member at a second bonding region. A first thermo-optic phase shifter is arranged on the first member and collocated with the first waveguide, and a second thermo-optic phase shifter is arranged on the second member and collocated with the second waveguide. The magneto-optic material and the first thermo-optic phase shifter of the first member cause a first phase shift in a first light beam travelling through the first waveguide, and the magneto-optic material and the second thermo-optic phase shifter of the second member cause a second phase shift in a second light beam travelling through the second waveguide.

    LASER DIODE OPTICAL FREQUENCY MODULATION LINEARIZATION ALGORITHM
    27.
    发明申请
    LASER DIODE OPTICAL FREQUENCY MODULATION LINEARIZATION ALGORITHM 审中-公开

    公开(公告)号：US20190018140A1

    公开(公告)日：2019-01-17

    申请号：US16020214

    申请日：2018-06-27

    Applicant: GM Global Technology Operations LLC

    Inventor： Raymond Sarkissian ,  Keyvan Sayyah

    IPC: G01S17/32 ,  G01S7/491 ,  G01S17/93

    Abstract: A lidar system includes a laser diode to provide a frequency modulated continuous wave (FMCW) signal, and a current source to provide a drive signal that modulates the laser diode. The current source is controlled to pre-distort the drive signal to provide a linear FMCW signal. The lidar system also includes a splitter to split the FMCW signal into an output signal and a local oscillator (LO) signal, a transmit coupler to transmit the output signal, a receive coupler to obtain a received signal based on reflection of the output signal by a target, and a combiner to combine the received signal with the LO signal into first and second combined signals. A first and second photodetector respectively receive the first and second combined signals and output first and second electrical signals from which a beat signal that indicates the pre-distortion needed for the drive signal is obtained.

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