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Characterization of SiN Integrated Optical Phased Arrays on a Wafer-Scale Test Station
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Fast-running beamforming algorithm for optical phased array beam scanners comprised of polymeric waveguide devices.

Jinung Jin, Eun-Su Lee, Kwon-Wook Chun

    Optics Express
    |February 25, 2022
    PubMed
    Summary

    A new algorithm compensates for phase errors in optical phased arrays (OPAs) for LiDAR. This fast beamforming method reduces phase adjustments, shortening beamforming time to 16 seconds for a 32-channel device.

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    Area of Science:

    • Photonics and Optical Engineering
    • LiDAR Technology
    • Waveguide Manufacturing

    Background:

    • Phase errors in optical phased arrays (OPAs) are an inherent challenge in beam scanning LiDAR, stemming from manufacturing imperfections.
    • These errors can significantly impact the performance and accuracy of LiDAR systems.

    Purpose of the Study:

    • To develop a fast-running beamforming algorithm to compensate for phase errors in OPAs.
    • To enable independent control of phase modulators in polymer waveguide OPAs by mitigating thermal crosstalk.

    Main Methods:

    • Implementation of a beamforming algorithm based on the rotating element vector method.
    • Utilizing least square approximation to minimize phase adjustments for a 32-channel polymer waveguide OPA device.

    Main Results:

    • The proposed algorithm effectively compensates for phase errors in OPAs.
    • Demonstrated a significant reduction in the number of phase adjustments required for beamforming.
    • Achieved a beamforming time of 16 seconds for a 32-channel polymer waveguide OPA.

    Conclusions:

    • The developed algorithm offers a fast and effective solution for phase error compensation in OPA-based LiDAR.
    • The method is particularly suitable for polymer waveguide OPAs due to suppressed thermal crosstalk.
    • This advancement contributes to more accurate and efficient beam scanning LiDAR systems.