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    Area of Science:

    • Optical imaging
    • Biomedical optics
    • Fiber optics

    Background:

    • Multimode fiber (MMF) imaging offers minimally invasive, high-resolution observation, crucial for bioendoscopic applications.
    • Current point scanning methods in MMF imaging suffer from background speckles due to mode interference, degrading image quality.
    • Increasing controllable modes to suppress speckles is limited by wavefront shaping device elements.

    Purpose of the Study:

    • To develop a novel method for enhancing the contrast-to-noise ratio (CNR) in MMF imaging.
    • To overcome the limitations of existing speckle suppression techniques in MMF imaging.
    • To improve image quality in MMF-based bioendoscopic imaging without increasing hardware complexity.

    Main Methods:

    • Introduced wavelength modulation as a technique to suppress background speckles in MMF imaging.
    • Utilized 20 different wavelengths to form focal spots at the same distal end position.
    • Leveraged the uncorrelated nature of background speckles and correlated signal patterns for signal enhancement.

    Main Results:

    • Achieved a four-fold enhancement in CNR for MMF imaging.
    • Successfully suppressed background speckles by making them uncorrelated across different wavelengths.
    • Demonstrated a significant improvement in imaging quality within a 200 µm field-of-view (FOV).

    Conclusions:

    • Wavelength modulation is an effective strategy to improve CNR in MMF imaging.
    • The proposed method enhances image quality without increasing the number of controllable modes.
    • This technique holds promise for advancing bioendoscopic imaging applications using MMF.