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Phase-sensitive optical time-domain reflectometry with Brillouin amplification.

Z N Wang, J Li, M Q Fan

    Optics Letters
    |August 1, 2014
    PubMed
    Summary

    We introduce a phase-sensitive optical time-domain reflectometry (Φ-OTDR) system using fiber Brillouin amplification (FBA). This method enhances long-distance sensing by significantly boosting probe signals, improving perturbation detection over 100 km.

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    Area of Science:

    • Optoelectronics
    • Fiber Optics
    • Sensing Technology

    Background:

    • Distributed fiber-optic sensing enables remote monitoring.
    • Phase-sensitive optical time-domain reflectometry (Φ-OTDR) offers high sensitivity.
    • Extending sensing range and signal strength in Φ-OTDR is crucial.

    Purpose of the Study:

    • To propose and demonstrate a novel Φ-OTDR scheme.
    • To enhance probe signal amplification using counterpumping fiber Brillouin amplification (FBA).
    • To achieve high-sensitivity perturbation detection over extended distances.

    Main Methods:

    • Implementation of a counterpumping FBA technique within a Φ-OTDR system.
    • Experimental validation of the FBA-enhanced Φ-OTDR over a 100 km fiber link.
    • Comparative analysis of FBA efficiency against fiber Raman amplification.

    Main Results:

    • Significant enhancement of the probe pulse signal, particularly in the latter half of the 100 km fiber.
    • Successful high-sensitivity perturbation detection demonstrated experimentally.
    • FBA showed substantially higher amplification efficiency compared to 28.0 dBm counterpumping fiber Raman amplification at low pump power (6.4 dBm).

    Conclusions:

    • The proposed FBA-enhanced Φ-OTDR scheme effectively extends sensing distance and improves signal levels.
    • FBA provides a more efficient amplification method than fiber Raman amplification for this application.
    • This FBA Φ-OTDR technique is adaptable to other distributed fiber-optic sensing systems.