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Performance enhancement of optical pulse coding phase-sensitive OTDR system with genetic-optimized code.

Hanyu Zhao, Fei Liu, Zhiwen Lian

    Optics Express
    |November 14, 2024
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces a novel genetic-optimized code (Go-code) for optical pulse coding in phase-sensitive optical time-domain reflectometry (φ-OTDR). The new method significantly enhances signal-to-noise ratio and reduces pulse distortion, improving vibration sensing performance.

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    Area of Science:

    • Photonics and Optical Sensing
    • Signal Processing
    • Fiber Optic Technology

    Background:

    • Phase-sensitive optical time-domain reflectometry (φ-OTDR) traditionally uses standard coding sequences for probe pulses.
    • Erbium-doped fiber amplifiers (EDFAs) in φ-OTDR systems can cause probe pulse distortion due to gain saturation.
    • This distortion negatively impacts the signal-to-noise ratio (SNR) and overall sensing performance.

    Purpose of the Study:

    • To propose and investigate a novel genetic-optimized code (Go-code) based optical pulse coding (OPC) scheme for φ-OTDR (GOPC φ-OTDR).
    • To mitigate probe pulse distortion caused by EDFA gain saturation.
    • To enhance the SNR and vibration sensing capabilities of φ-OTDR systems.

    Main Methods:

    • Development of a unique Go-code sequence using a distributed genetic algorithm (DGA), optimized for φ-OTDR vibration sensing.
    • Theoretical analysis of EDFA gain saturation effects and coding gain specific to the Go-code sequence.
    • Experimental implementation and comparison of the GOPC φ-OTDR with a standard Golay φ-OTDR system.

    Main Results:

    • The GOPC φ-OTDR demonstrated reduced distortion in the decoding response compared to Golay φ-OTDR.
    • An approximate 7.48 dB improvement in phase demodulation SNR was achieved within a 10-km sensing range.
    • The Go-code sequence proved effective in adapting to vibration sensing requirements in φ-OTDR.

    Conclusions:

    • The proposed GOPC φ-OTDR scheme offers significant improvements in SNR and distortion mitigation.
    • This research marks the first application of Go-code in φ-OTDR, validating its potential for advanced optical sensing.
    • The findings open new possibilities for exploring and developing advanced optical pulse coding technologies in fiber optic sensing.