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High-performance PGC algorithm for a Φ-OTDR system based on multi-carrier mixing.

Teng Ma, Xuping Zhang, Bangwei Liu

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    Summary

    A new multi-carrier mixing algorithm enhances phase-generated carrier (PGC) demodulation for distributed fiber sensing. This method accurately reconstructs signals and suppresses disturbances, improving vibration sensing capabilities.

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    Area of Science:

    • Optical Engineering
    • Signal Processing
    • Fiber Optic Sensors

    Background:

    • Distributed fiber sensing systems, like Φ-OTDR, face accuracy limitations due to modulation depth, carrier phase delay, and laser intensity disturbances.
    • These disturbances hinder high-accuracy vibration sensing in complex environments.

    Purpose of the Study:

    • To develop a high-performance phase-generated carrier (PGC) demodulation algorithm for distributed fiber sensing.
    • To overcome limitations of conventional PGC algorithms by suppressing environmental disturbances.

    Main Methods:

    • Proposed a novel multi-carrier mixing (PGC-MCM) algorithm.
    • Utilized mathematical logic operations between mixed carrier signals and interference signals for phase reconstruction.
    • Conducted experiments to validate performance under varying vibration conditions.

    Main Results:

    • The PGC-MCM algorithm accurately reconstructs phase signals and suppresses disturbances.
    • Achieved high-fidelity recovery of vibration signals with varying frequencies and amplitudes.
    • Demonstrated excellent linearity and noise immunity with THD of -66.32 dB, SINAD of 54.74 dB, and amplitude error rate of 0.46%.

    Conclusions:

    • The PGC-MCM algorithm offers a robust solution for high-accuracy distributed optical fiber sensing.
    • The proposed method significantly improves vibration sensing performance in challenging conditions.
    • This advancement holds strong potential for practical applications requiring precise fiber optic sensing.