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Related Experiment Video

Updated: Mar 9, 2026

Writing Bragg Gratings in Multicore Fibers
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Programmable long-period grating in a liquid core optical fiber.

Tao Qi, Yongmin Jung, Limin Xiao

    Optics Letters
    |December 23, 2016
    PubMed
    Summary

    A novel programmable fiber long-period grating (LPG) was created in liquid core optical fiber. This dynamic device offers reconfigurable spectrum shaping for advanced all-fiber optics.

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    Area of Science:

    • Photonics and optical engineering
    • Fiber optics technology
    • Advanced materials science

    Background:

    • Fiber long-period gratings (LPGs) are crucial optical components.
    • Existing LPGs often lack dynamic tunability and programmability.
    • Liquid core fibers offer unique thermo-optic properties.

    Purpose of the Study:

    • To experimentally demonstrate a programmable fiber long-period grating (LPG) in a liquid core optical fiber.
    • To achieve dynamic and real-time reconfiguration of LPG characteristics.
    • To enable advanced spectrum shaping capabilities in all-fiber systems.

    Main Methods:

    • Fabrication of a liquid core optical fiber with a micro-heater array.
    • Generation of a dynamic temperature gradient for LPG formation.

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  • Digital control of grating parameters including period, index contrast, and length.
  • Utilizing the high thermo-optic coefficient of the liquid core for efficient coupling.

    • Main Results:

    • Successful demonstration of a programmable LPG with low insertion loss.
    • Complete reconfiguration of the transmission spectrum by digital control.
    • Ability to define phase shifts for advanced spectrum shaping.
    • High coupling efficiencies achieved with low driving powers (tens of milliwatts).

    Conclusions:

    • The developed thermo-programmable LPG offers dynamic control over optical characteristics.
    • This technology presents a viable solution for advanced, reconfigurable all-fiber optical components.
    • The use of liquid core fibers enhances efficiency and programmability in fiber gratings.