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Bend translation in multimode fiber imaging.

Damien Loterie, Demetri Psaltis, Christophe Moser

    Optics Express
    |April 7, 2017
    PubMed
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    Certain multimode fibers show stable light propagation even with an S-shaped bend. High numerical aperture fibers are more resilient, allowing for translation of the bend with minimal impact on imaging performance.

    Area of Science:

    • Optics and Photonics
    • Fiber Optics Engineering

    Background:

    • Multimode fibers (MMFs) are generally sensitive to geometric variations.
    • Understanding MMF behavior under bending is crucial for applications like fiber optic imaging.

    Purpose of the Study:

    • To investigate light propagation characteristics in MMFs with a translated S-shaped bend.
    • To identify fiber properties that enhance stability under bending stress.

    Main Methods:

    • Experimental testing of various MMFs with a 25 mm radius of curvature S-shaped bend.
    • Translation of the bend along the fiber and assessment of propagation changes.
    • Numerical simulations to validate experimental findings.

    Main Results:

    • Significant differences in bending sensitivity observed across fibers with varying core diameters and numerical apertures.

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  • Fibers with a large numerical aperture exhibited superior stability.
  • Bend translation up to 25 mm showed limited impact on imaging performance in several tested fibers.

    • Conclusions:

    • Nearly constant propagation characteristics are achievable in specific MMFs under a sliding S-shaped bend configuration.
    • High numerical aperture MMFs offer enhanced stability, broadening their potential for flexible imaging applications.