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Related Experiment Video

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Optical fiber Fabry-Perot interferometer coupled to a 3-D integrated waveguide for 3-D position sensing.

Chen Zhu, Huitong Deng, Zhenming Ding

    Optics Letters
    |December 1, 2021
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    Summary

    This study introduces a novel optical fiber sensor for three-dimensional (3-D) displacement measurements. The new extrinsic Fabry-Perot interferometer (EFPI) design achieves sub-micron resolution using an optical waveguide and machine learning.

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    Area of Science:

    • Optoelectronics
    • Fiber Optic Sensors
    • Interferometry

    Background:

    • Extrinsic Fabry-Perot interferometers (EFPIs) are widely used for precise displacement sensing.
    • Conventional EFPIs are limited to one-dimensional measurements.
    • Advanced sensing capabilities are needed for multi-dimensional physical quantity measurement.

    Purpose of the Study:

    • To propose and demonstrate a novel extrinsic Fabry-Perot interferometer (EFPI) for three-dimensional (3-D) displacement sensing.
    • To develop a compact hybrid sensor integrating optical fiber and optical waveguides.
    • To achieve sub-micron resolution in 3-D positioning measurements.

    Main Methods:

    • Fabrication of a hybrid EFPI device using a lead-in optical fiber and a 3-D integrated optical waveguide array.
    • Simultaneous measurement of reflected and transmitted light from the EFPI.
    • Application of machine learning-based analysis for 3-D positioning data interpretation.

    Main Results:

    • Successful demonstration of a 3-D extrinsic Fabry-Perot interferometer (EFPI) sensor.
    • Achieved sub-micron resolution for 3-D positioning.
    • Validated the use of optical waveguides as external reflectors in EFPIs.

    Conclusions:

    • The proposed hybrid EFPI sensor enables accurate 3-D displacement measurements.
    • This approach overcomes the 1-D limitation of conventional EFPIs.
    • The integration of optical waveguides and machine learning offers a new pathway for compact, multi-dimensional sensing.