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Related Experiment Video

Updated: Mar 2, 2026

Fabrication and Testing of Photonic Thermometers
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Published on: October 24, 2018

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Photonics sensing at the thermodynamic limit.

George Skolianos, Arushi Arora, Martin Bernier

    Optics Letters
    |May 16, 2017
    PubMed
    Summary

    This study presents a novel slow-light fiber Bragg grating strain sensor achieving unprecedented resolution. By minimizing thermodynamic phase fluctuations, it enables highly sensitive strain detection for advanced applications.

    Area of Science:

    • Optics and Photonics
    • Materials Science
    • Sensor Technology

    Background:

    • Fiber Bragg gratings (FBGs) are widely used for strain sensing.
    • Achieving ultra-high resolution in FBG strain sensors is challenging due to various noise sources.
    • Thermodynamic phase fluctuations and laser frequency noise are primary limitations.

    Purpose of the Study:

    • To develop a slow-light fiber Bragg grating strain sensor with resolution limited by thermodynamic phase fluctuations.
    • To investigate the impact of grating length on phase noise and strain resolution.
    • To demonstrate a minimum detectable length for strain sensing.

    Main Methods:

    • Utilized a short fiber Bragg grating (4.5 mm) to enhance thermal phase noise.
    • Employed an ultra-stable interrogation laser to minimize laser frequency noise.

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  • Leveraged a slow-light mode with a high group index (approximately 533) to suppress other noise sources.

    • Main Results:

    • Demonstrated a strain resolution as low as 130 fε/√Hz.
    • Achieved a minimum detectable length of approximately 3×10⁻¹⁵ m at 1.5 kHz.
    • Observed phase noise suppression inversely proportional to the square root of grating length in a longer grating (21 mm), consistent with theory.

    Conclusions:

    • The developed slow-light FBG sensor achieves resolution limited by fundamental thermodynamic phase fluctuations.
    • The sensor design effectively suppresses various noise sources, enabling ultra-high strain sensitivity.
    • This technology holds promise for applications requiring extremely precise length or strain measurements.