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Ultra-long phase-sensitive OTDR with hybrid distributed amplification.

Z N Wang, J J Zeng, J Li

    Optics Letters
    |November 1, 2014
    PubMed
    Summary

    This study demonstrates a 175 km distributed vibration sensing system using a novel hybrid amplification technique. This breakthrough achieves the longest sensing range without repeaters, advancing fiber-optic sensing capabilities.

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    Area of Science:

    • Optoelectronics
    • Fiber Optics Sensing

    Background:

    • Distributed vibration sensing (DVS) systems are crucial for infrastructure monitoring.
    • Extending the sensing range of DVS systems without repeaters presents significant technical challenges.

    Purpose of the Study:

    • To demonstrate a phase-sensitive optical time-domain reflectometry (Φ-OTDR) system with an extended sensing range.
    • To achieve long-distance distributed vibration sensing without the need for signal repeaters.

    Main Methods:

    • Utilized a hybrid amplification scheme combining co-pumping second-order Raman amplification (random fiber lasing), counter-pumping first-order Raman amplification, and counter-pumping Brillouin amplification.
    • Each amplification technique was strategically employed to cover distinct segments of the 175 km sensing fiber.

    Main Results:

    • Successfully demonstrated a Φ-OTDR system with a 175 km sensing range and 25 m spatial resolution.
    • Achieved distributed vibration sensing over the longest distance reported to date without intermediate repeaters.

    Conclusions:

    • The novel hybrid amplification scheme enables unprecedented long-range distributed vibration sensing.
    • This approach is adaptable for extending the sensing capabilities of other fiber-optic sensing systems.