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Cyclic coding for Brillouin optical time-domain analyzers using probe dithering.

Haritz Iribas, Alayn Loayssa, Florian Sauser

    Optics Express
    |April 26, 2017
    PubMed
    Summary

    We investigated performance limits in Brillouin optical time-domain analysis (BOTDA) sensors using cyclic coding and probe wave dithering. High probe power enhances signal-to-noise ratio, but introduces distortions. We analyzed these distortions to improve BOTDA performance.

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    Area of Science:

    • Optical sensing technologies
    • Fiber optic sensor performance analysis
    • Signal processing in optical systems

    Background:

    • Brillouin optical time-domain analysis (BOTDA) sensors are crucial for distributed strain and temperature sensing.
    • Probe wave dithering in BOTDA enhances signal-to-noise ratio (SNR) by mitigating non-local effects and preventing noise generation.
    • High probe power levels, enabled by dithering, significantly boost analyzer performance.

    Purpose of the Study:

    • To analyze the performance limits of mono-color cyclic coding in dithered BOTDA systems.
    • To identify and analyze detrimental effects arising from high probe power levels in cyclic coded BOTDA.
    • To demonstrate performance enhancements in long-range dithered dual-probe BOTDA systems.

    Main Methods:

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  • Investigated mono-color cyclic coding applied to BOTDA with probe wave dithering.
  • Analyzed measurement distortions caused by power differences in code sequences, first-order non-local effects, and non-linear amplification.
  • Applied analysis results to a long-range dithered dual-probe BOTDA setup.

    • Main Results:

    • Identified distortions in decoding and measurement errors due to high probe power in cyclic coded BOTDA.
    • Demonstrated performance enhancement in a 164-km fiber-loop BOTDA system.
    • Achieved 1-m spatial resolution and 3-MHz Brillouin frequency shift measurement precision at the worst contrast location.

    Conclusions:

    • Mono-color cyclic coding in dithered BOTDA offers significant performance gains, particularly for long-range sensing.
    • Understanding and mitigating distortions caused by high probe power is critical for optimal BOTDA performance.
    • This study presents the longest sensing distance reported for a BOTDA sensor utilizing mono-color cyclic coding.