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Updated: Jul 4, 2025

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Improved PGC demodulation algorithm for fiber optic interferometric sensors.

Mingda Zhu, Xinxin Wang, Jiaying Chang

    Optics Express
    |February 1, 2024
    PubMed
    Summary
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    This study introduces an improved phase generated carrier arctangent demodulation algorithm (PGC-Arctan-HP) that enhances accuracy in interferometric measurements. The new method effectively reduces errors caused by modulation depth shifts and light intensity disturbances.

    Area of Science:

    • Optics and Photonics
    • Signal Processing

    Background:

    • Interferometric measurements are susceptible to various disturbances.
    • Existing demodulation algorithms often struggle with modulation depth shifts, carrier phase delay, and light intensity disturbances (LID).

    Purpose of the Study:

    • To propose and validate an improved phase generated carrier arctangent demodulation algorithm (PGC-Arctan-HP).
    • To eliminate the impact of modulation depth shift, carrier phase delay, and LID on demodulation results.

    Main Methods:

    • Development of the PGC-Arctan-HP algorithm integrating harmonic mixing and phase quadrature technology.
    • Comparative analysis through simulations and experimental interferometry.

    Main Results:

    • Simulation results align with theoretical predictions, demonstrating superior performance over other algorithms.

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  • Experimental validation shows stable demodulated waveforms with a low amplitude error of 0.0294%.
  • Achieved excellent signal quality with total harmonic distortion (THD) of -60.0286 dB and signal-to-noise-and-distortion (SINAD) of 59.5388 dB.

    • Conclusions:

    • The PGC-Arctan-HP algorithm offers optimal demodulation performance for interferometric applications.
    • The algorithm effectively mitigates common sources of error, leading to highly accurate and stable measurements.