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Related Experiment Video

Updated: Aug 25, 2025

Characterization of SiN Integrated Optical Phased Arrays on a Wafer-Scale Test Station
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Vernier optical phased array lidar transceivers.

Nathan Dostart, Bohan Zhang, Michael Brand

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    |October 14, 2022
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    Summary
    This summary is machine-generated.

    A novel Vernier transceiver scheme overcomes limitations in 2D optical phased arrays (OPAs) by using paired arrays with different periodicities. This innovation suppresses grating lobes, enhancing field of view and efficiency for lidar applications.

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    Area of Science:

    • Photonics and Optical Engineering
    • Lidar Technology
    • Integrated Optics

    Background:

    • Two-dimensional optical phased arrays (OPAs) face limitations due to grating lobes when row spacings exceed half a wavelength.
    • These grating lobes restrict the field of view (FOV), introduce signal ambiguity, and decrease optical efficiency, particularly in lidar systems.

    Purpose of the Study:

    • To introduce and demonstrate a Vernier transceiver scheme for OPAs to mitigate grating lobe issues.
    • To enable wider FOVs, reduce signal ambiguity, and improve optical efficiency in 2D beam-steering applications.

    Main Methods:

    • Implementation of a Vernier transceiver scheme using paired transmit and receive OPAs with mismatched row periodicities.
    • Analysis of two grating lobe suppressing beam-steering configurations, including dynamic Vernier alignment for multi-beam or ultra-fast scanning.
    • Experimental demonstration using 2D-wavelength-steered serpentine OPAs.

    Main Results:

    • Achieved significant grating lobe suppression of 6.4 dB.
    • Demonstrated beam steering across a 5.5° range.
    • Successfully eliminated return signal ambiguity by aligning only a single pair of transmit and receive lobes.

    Conclusions:

    • The Vernier transceiver scheme effectively suppresses grating lobes in 2D OPAs.
    • This approach enables larger FOVs and reduced complexity in photonic lidar systems.
    • Paves the way for advanced 2D beam-steering designs with improved performance.