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Bandwidth efficient coherent lidar based on phase-diversity detection.

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    This study introduces a novel coherent lidar system utilizing phase-diversity detection. This method doubles bandwidth efficiency by using both in-phase (I) and quadrature (Q) signals, enhancing range resolution.

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    Area of Science:

    • Optics and Photonics
    • Signal Processing
    • Remote Sensing Technology

    Background:

    • Coherent lidar systems are crucial for various applications, but bandwidth efficiency and range resolution are key performance metrics.
    • Existing lidar technologies face limitations in achieving high bandwidth efficiency and precise range resolution simultaneously.

    Purpose of the Study:

    • To report the first-ever bandwidth efficient coherent lidar system employing phase-diversity detection.
    • To demonstrate a method for doubling bandwidth efficiency in lidar systems.
    • To enhance the range resolution of lidar through advanced signal processing.

    Main Methods:

    • Implementation of a coherent lidar system incorporating phase-diversity detection.
    • Simultaneous utilization of in-phase (I) and quadrature (Q) signal components.
    • Application of digital signal processing to maintain radio frequency (RF) phase continuity between chirped I and Q components.

    Main Results:

    • Achieved doubling of bandwidth efficiency compared to conventional methods.
    • Successfully utilized both I and Q components for enhanced performance.
    • Demonstrated improved range resolution through maintained RF phase continuity.

    Conclusions:

    • Phase-diversity detection offers a significant advancement for coherent lidar systems.
    • The simultaneous use of I and Q components is key to improving bandwidth efficiency.
    • Digital signal processing techniques are vital for optimizing lidar performance, particularly range resolution.