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Related Experiment Video

Updated: Feb 25, 2026

Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping
09:48

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Published on: November 7, 2016

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Few-mode optical fiber based simultaneously distributed curvature and temperature sensing.

Hao Wu, Ming Tang, Meng Wang

    Optics Express
    |August 9, 2017
    PubMed
    Summary

    This study presents a hybrid Raman-Brillouin sensing system for simultaneous distributed curvature and temperature measurement in few-mode fibers (FMFs). The novel approach overcomes cross-sensitivity issues, enabling accurate environmental monitoring.

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    Area of Science:

    • Fiber optic sensing
    • Optical physics
    • Materials science

    Background:

    • Few-mode fibers (FMFs) enable distributed curvature measurement using Brillouin sensing by detecting bend-induced strain.
    • Brillouin sensors suffer from temperature-strain cross-sensitivity, limiting practical applications.
    • Quasi-single mode (QSM) operation in FMFs enhances sensing capabilities.

    Purpose of the Study:

    • To develop a simultaneous distributed curvature and temperature sensing system.
    • To overcome the temperature-strain cross-sensitivity in Brillouin-based FMF sensing.
    • To exploit a hybrid Raman-Brillouin system for enhanced sensing performance.

    Main Methods:

    • Utilizing a hybrid quasi-single mode (QSM) Raman-Brillouin system in few-mode fibers (FMFs).
    • Employing Brillouin frequency shift changes for curvature estimation.
    • Leveraging Raman signals with enhanced signal-to-noise ratio (SNR) to mitigate temperature effects.
    • Achieving distributed sensing along a 2 km FMF with a 1.5 m spatial resolution.

    Main Results:

    • Simultaneous and accurate distributed measurement of curvature and temperature was demonstrated.
    • The Brillouin frequency shift change in FMFs was effectively correlated with curvature.
    • Raman signals successfully alleviated temperature-induced variations, improving measurement accuracy.
    • A spatial resolution of 1.5 m was achieved within a 2-minute measurement time over 2 km of FMF.
    • The worst-case resolutions were 0.333 cm-2 for fiber curvature squared and 1.301 °C for temperature.

    Conclusions:

    • The proposed hybrid QSM Raman-Brillouin system offers a robust solution for simultaneous distributed curvature and temperature sensing in FMFs.
    • This approach effectively addresses the cross-sensitivity limitations of traditional Brillouin sensors.
    • The enhanced SNR of Raman signals contributes to improved temperature measurement accuracy.
    • The system demonstrates practical potential for environmental monitoring applications requiring precise strain and temperature data.