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Self-calibration phase demodulation scheme for stabilization based on an auxiliary reference fiber-optic

Yingjie Wu, Churui Li, Chao Wang

    Optics Express
    |February 14, 2023
    PubMed
    Summary

    This study introduces a novel phase demodulation method using an auxiliary reference interferometer and elliptic fitting. This self-calibration technique improves signal quality and reduces distortion in optical measurements.

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    Area of Science:

    • Optoelectronics
    • Interferometry
    • Signal Processing

    Background:

    • Light source jitter and asymmetric 3x3 couplers present challenges in phase demodulation.
    • Accurate real-time calibration is crucial for small signal measurements in interferometric systems.

    Purpose of the Study:

    • To propose and validate a phase demodulation method addressing light source jitter and coupler asymmetry.
    • To enhance signal-to-noise and distortion ratios and suppress harmonic distortion.

    Main Methods:

    • A self-calibration scheme combining an auxiliary reference interferometer with phase modulation.
    • Real-time calibration of sensing arm parameters.
    • Application of an elliptic fitting algorithm for phase demodulation.

    Main Results:

    • The proposed method significantly improves signal-to-noise and distortion ratio by 1.65 dB and 10.47 dB compared to traditional methods.
    • Effective suppression of harmonic distortion, achieving -33.64 dB total harmonic distortion for small signals.
    • Validation through both simulation and experimental verification.

    Conclusions:

    • The developed self-calibration phase demodulation method effectively overcomes limitations of light source jitter and asymmetric couplers.
    • This approach offers superior performance in terms of signal quality and distortion suppression for optical sensing applications.