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Multicolor Fluorescence Detection for Droplet Microfluidics Using Optical Fibers
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Speckle-based wavelength recognition using a defect-engineered multimode fiber.

Jianglin Luo, Yunlong Xu, Haixin Chen

    Optics Letters
    |April 15, 2025
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces defect-engineered multimode fibers (MMFs) for enhanced wavelength recognition. This technique improves spectral resolution in compact, stable fiber optic systems, crucial for precision measurements.

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    Area of Science:

    • Optics and Photonics
    • Materials Science
    • Laser Technology

    Background:

    • Accurate wavelength identification is vital for applications like bio-imaging and metrology.
    • Current speckle-based systems using multimode fibers (MMFs) improve spectral resolution with longer fibers, but this reduces stability.
    • There is a need for compact, stable, and highly resolved wavelength recognition systems.

    Purpose of the Study:

    • To develop a novel speckle-based wavelength recognition technique using defect-engineered multimode fibers.
    • To enhance spectral resolution without increasing fiber length, thus maintaining system stability.
    • To demonstrate the effectiveness of this method for precise light classification.

    Main Methods:

    • Fabrication of defect-engineered multimode fibers using femtosecond laser inscription of random defect arrays.
    • Excitation of higher-order modes within the engineered multimode fibers.
    • Integration of the engineered fibers with neural networks for wavelength classification.

    Main Results:

    • Achieved spectral resolution enhancement from ~250 pm to 100 pm in a 5 cm multimode fiber.
    • Incorporation of 30 random defect arrays significantly improved spectral resolution.
    • Neural network classification of light into 1500 nm, 1550 nm, and 1600 nm bands with >99% accuracy.
    • Demonstrated high stability, compactness, and ease of operation.

    Conclusions:

    • Defect-engineered multimode fibers offer a significant improvement in spectral resolution for wavelength recognition.
    • The proposed technique enables highly integrated and reliable wavelength recognition systems.
    • This method is suitable for miniaturized devices requiring precise optical measurements.