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    Area of Science:

    • Optics and Photonics
    • Metrology and Measurement Science

    Background:

    • Laser phase noise significantly impacts the accuracy of frequency-modulated continuous-wave (FMCW) distance measurements.
    • The common assumption of white-frequency noise for ranging performance prediction is often insufficient due to other degrading noise sources.
    • Active sweep linearization techniques in ranging systems can further influence phase noise characteristics.

    Purpose of the Study:

    • To develop and present a comprehensive phase-noise model for assessing the accuracy of phase-locked swept laser sources.
    • To investigate the limitations of the standard white-frequency-noise assumption in FMCW ranging.
    • To analyze the impact of active sweep linearization on phase noise in distance measurement systems.

    Main Methods:

    • Development of a novel phase-noise model tailored for swept laser sources.
    • Analysis of heterodyne beat signal degradation caused by various noise sources.
    • Incorporation of active sweep linearization effects into the phase-noise model.

    Main Results:

    • The proposed model provides a more accurate assessment of ranging accuracy compared to the standard white-frequency-noise assumption.
    • Identified specific noise sources that invalidate the white-frequency-noise assumption in practical ranging systems.
    • Quantified the impact of active sweep linearization on the phase noise of the laser source.

    Conclusions:

    • The presented phase-noise model is crucial for accurately evaluating the ranging performance of FMCW systems employing phase-locked swept lasers.
    • Moving beyond the white-frequency-noise assumption is necessary for precise distance measurements.
    • The model offers a valuable tool for optimizing laser-based ranging systems.