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Related Experiment Video

Updated: Apr 19, 2026

Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping
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UV exposure on a single-mode fiber within a multimode interference structure.

Qiang Wu, Jinhui Yuan, Chongxiu Yu

    Optics Letters
    |December 10, 2014
    PubMed
    Summary
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    UV exposure tunes single-mode fiber multimode interferometers. This fiber optic sensor shows high refractive index sensitivity, enabling advanced sensing applications.

    Area of Science:

    • Optics and Photonics
    • Materials Science

    Background:

    • Fiber optic sensors offer sensitive detection methods.
    • Multimode interferometers (MMI) are key components in fiber sensing.
    • UV exposure is a technique for modifying optical fiber properties.

    Purpose of the Study:

    • To investigate the impact of UV exposure on a single-mode fiber (SMF) based multimode interferometer (MMI).
    • To explore the potential of UV-modified SMSMS fiber structures for refractive index (RI) sensing.

    Main Methods:

    • Experimental study of a singlemode-multimode-singlemode-multimode-singlemode (SMSMS) fiber structure.
    • Irradiation of the central SMF with a 193 nm UV laser (3 mJ pulse energy, 3 mm beam width).
    • Numerical simulation to determine refractive index sensitivity and linearity.

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    Main Results:

    • Observed a wavelength shift exceeding 33 nm upon UV irradiation of the central SMF.
    • Numerical simulations predicted a high RI sensitivity of 67670 nm/RIU with excellent linearity (R2≈0.9999).

    Conclusions:

    • UV exposure effectively tunes the characteristics of fiber MMI devices.
    • The SMSMS fiber structure demonstrates potential for high-sensitivity RI sensing applications.
    • Replacing the central SMF with a hollow-core fiber allows for sample-based sensing.