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Related Experiment Video

Updated: Nov 5, 2025

Implementation of a Reference Interferometer for Nanodetection
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Fast fiber mode decomposition with a lensless fiber-point-diffraction interferometer.

Junbo Li, Xiaoyu Zhang, Yunhan Zheng

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    |May 14, 2021
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    Summary

    A novel lensless interferometer enables rapid fiber mode decomposition (MD) for few-mode fibers. This technique accurately identifies 10 modes, crucial for telecommunications and laser applications.

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    Area of Science:

    • Optical Engineering
    • Photonics
    • Telecommunications

    Background:

    • Growing demand for few-mode fibers in telecommunications and high-power lasers.
    • Need for efficient fiber mode decomposition (MD) techniques.

    Purpose of the Study:

    • To develop a fast and accurate fiber mode decomposition method.
    • To enable mode analysis without complex imaging systems.

    Main Methods:

    • Utilized a lensless fiber-point-diffraction interferometer.
    • Employed polarization phase-shifting and lensless imaging for complex amplitude retrieval.
    • Applied mode orthogonal operations for eigenmode coefficient determination.

    Main Results:

    • Successfully performed 10-mode decomposition on an SMF-28e fiber at 632.8 nm.
    • Achieved decomposition of interferograms in just 0.0168 seconds.
    • Demonstrated high similarity (>97%) in intensity patterns before and after decomposition.

    Conclusions:

    • Presented a novel, fast, and accurate 10-mode fiber MD method.
    • The lensless approach eliminates the need for imaging systems.
    • This technique is vital for advancing few-mode fiber applications.