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Updated: Mar 20, 2026

Writing Bragg Gratings in Multicore Fibers
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Highly efficient spectrally encoded imaging using a 45° tilted fiber grating.

Guoqing Wang, Chao Wang, Zhijun Yan

    Optics Letters
    |June 1, 2016
    PubMed
    Summary

    A new spectrally encoded imaging (SEI) system utilizes a 45° tilted fiber grating (TFG) for efficient, compact imaging. This fiber-compatible design enhances energy efficiency and stability, achieving 42 μm resolution.

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    Area of Science:

    • Optical Engineering
    • Biomedical Imaging
    • Photonics

    Background:

    • Conventional spectrally encoded imaging (SEI) systems often rely on bulky and inefficient free-space diffraction gratings.
    • There is a need for more compact, stable, and energy-efficient SEI systems for advanced imaging applications.

    Purpose of the Study:

    • To propose and demonstrate a novel, highly efficient, fiber-compatible SEI system.
    • To replace conventional free-space gratings with an in-fiber tilted fiber grating (TFG).

    Main Methods:

    • Development of a SEI system incorporating a 45° tilted fiber grating (TFG).
    • The TFG functions as an in-fiber lateral diffraction element.
    • Experimental demonstration and resolution testing of the TFG-based SEI system.

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    Main Results:

    • The TFG achieved a high diffraction efficiency of 93.5% under controlled polarization.
    • The novel SEI system demonstrated significantly reduced volume and improved energy efficiency and stability.
    • A lateral resolution of 42 μm was achieved in the proof-of-principle experiment.

    Conclusions:

    • The TFG-based SEI system offers a highly efficient and compact alternative to conventional designs.
    • This fiber-compatible approach enhances system stability and reduces energy loss.
    • The demonstrated resolution indicates potential for various imaging applications.