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Analysis and improvement of dynamic range in a time-division-multiplexing interferometric fiber-optic sensor array.

Fei Liu, Min Zhang, Duo Yi

    Optics Letters
    |February 15, 2023
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    Summary

    This study enhances the dynamic range of time-division-multiplexing interferometric fiber-optic sensors (TDM IFOS) by increasing carrier frequency. This method improves sensor performance without hardware changes, offering broad application potential.

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    Area of Science:

    • Optoelectronics
    • Sensor Technology
    • Signal Processing

    Background:

    • Dynamic range is crucial for characterizing interferometric fiber-optic sensors (IFOS).
    • Existing TDM IFOS systems face limitations in dynamic range performance.
    • Carrier frequency and repetition frequency significantly influence TDM IFOS capabilities.

    Purpose of the Study:

    • To analyze the impact of carrier frequency and repetition frequency on TDM IFOS dynamic range.
    • To propose and validate a novel demodulation method for enhancing TDM IFOS dynamic range.
    • To improve the maximum detectable amplitude and maintain a low noise floor in TDM IFOS.

    Main Methods:

    • Heterodyne detection scheme in a TDM IFOS array.
    • Analysis of dynamic range dependence on carrier and repetition frequencies.
    • Implementation of a novel demodulation method with higher carrier frequency (up to 20 MHz) and an upgraded algorithm.

    Main Results:

    • Increased carrier frequency elevated maximum detectable phase amplitude by over 6 dB.
    • The demodulated noise floor remained stable at approximately -100 dB ref rad/√Hz.
    • Experimental results showed an average dynamic range enhancement of ~10.5 dB across 10 Hz to 20 kHz.

    Conclusions:

    • The proposed method effectively improves the dynamic range of TDM IFOS without hardware modifications.
    • Higher carrier frequencies and optimized demodulation are key to enhanced sensor performance.
    • This optimization strategy holds significant promise for various IFOS applications.