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Integrated nonlinearity calibration optical-electrical engine for FMCW LiDAR application.

Jing Wang, Lin Zhu, Ben Niu

    Optics Letters
    |December 1, 2023
    PubMed
    Summary

    We developed an integrated optical-electrical module to enhance the linearity of optical sources for frequency-modulated continuous-wave (FMCW) LiDAR. This calibration improves LiDAR range performance by reducing laser nonlinearity to 10^-6 ~ 10^-7.

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    Area of Science:

    • Photonics
    • Optical Engineering
    • LiDAR Technology

    Background:

    • Linearity of the optical source is critical for accurate range performance in Frequency-Modulated Continuous-Wave (FMCW) LiDAR systems.
    • Existing calibration methods often rely on separate, costly devices, limiting integration and increasing expense.

    Purpose of the Study:

    • To demonstrate an integrated optical-electrical calibration module for enhancing optical source linearity in FMCW LiDAR.
    • To overcome the limitations of cost and integration associated with traditional calibration techniques.

    Main Methods:

    • Developed an integrated module featuring a silicon photonic chip with a long optical delay line, tunable phase shifter, and balanced photodetectors.
    • Incorporated aided amplification and voltage bias circuits for module operation.
    • Utilized a nonlinearity calibration algorithm with the integrated module to analyze laser relative nonlinearity.

    Main Results:

    • Achieved significant improvement in laser relative nonlinearity, reducing the 1-r^2 metric to the range of 10^-6 to 10^-7 after calibration.
    • Demonstrated the effectiveness of the integrated module and algorithm for precise nonlinearity calibration.

    Conclusions:

    • The integrated optical-electrical calibration module offers a cost-effective and highly integrable solution for improving FMCW LiDAR performance.
    • Future enhancements in calibration accuracy are possible by increasing the optical delay line length on the chip.