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Updated: May 7, 2026

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Birefringence dispersion compensation demodulation algorithm for polarized low-coherence interferometry.

Shuang Wang, Tiegen Liu, Junfeng Jiang

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    Summary
    This summary is machine-generated.

    A new algorithm for polarized low-coherence interferometers precisely measures phase shifts by accounting for birefringence dispersion. This method significantly improves demodulation precision for optical fiber sensors, overcoming traditional limitations.

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    Area of Science:

    • Optics and Photonics
    • Sensor Technology
    • Materials Science

    Background:

    • Polarized low-coherence interferometry is crucial for precise measurements.
    • Traditional methods face challenges with 2π ambiguity and demodulation precision.
    • Birefringence dispersion in optical materials can affect interferometric measurements.

    Purpose of the Study:

    • To propose a novel demodulation algorithm for polarized low-coherence interferometers.
    • To address the challenge of 2π ambiguity in locating the zero-order fringe.
    • To enhance the precision of phase shift extraction in interferometric sensing.

    Main Methods:

    • Developing a mathematical model of polarized low-coherence interference fringes incorporating birefringence dispersion.
    • Utilizing the model to extract phase shift information relative to the coherence envelope center.
    • Implementing and validating the algorithm using an optical fiber Fabry-Perot pressure sensor.

    Main Results:

    • The proposed algorithm successfully extracts phase shift information, eliminating 2π ambiguity.
    • Experimental validation demonstrated a demodulation precision of 0.077 kPa over a 210 kPa range.
    • The new method achieved a 23-fold improvement in precision compared to traditional envelope detection.

    Conclusions:

    • The birefringence dispersion-based demodulation algorithm offers superior performance for polarized low-coherence interferometry.
    • This advancement significantly enhances the accuracy of optical fiber sensors, particularly for pressure measurement.
    • The algorithm provides a robust solution for precise phase shift extraction in demanding applications.