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    Area of Science:

    • Optical Fiber Technology
    • Materials Science

    Background:

    • Large-mode-area fibers are crucial for high-power applications.
    • Bending sensitivity and heat load impact fiber performance.
    • Reducing fundamental mode loss is key for efficient operation.

    Purpose of the Study:

    • To propose and investigate a novel bend-resistant stress-type large-mode-area fiber.
    • To enhance the loss ratio between high-order modes and the fundamental mode.
    • To reduce fundamental mode loss and maintain single-mode operation under stress.

    Main Methods:

    • Utilized the finite element method (FEM) and coupled-mode theory.
    • Investigated mode loss and effective mode field area with and without heat load.
    • Analyzed mode field evolution during straight-to-bending transitions.

    Main Results:

    • Achieved an effective mode field area of 1050.1 µm².
    • Obtained a fundamental mode loss as low as 0.0055 dB·m⁻¹.
    • Demonstrated a loss ratio greater than 210 between the least loss HOM and fundamental mode.
    • Coupling efficiency reached 0.85 at 1.064 µm with a 24 cm bending radius.
    • Maintained single-mode operation under heat loads from 0 to 8 W/m.

    Conclusions:

    • The novel fiber design offers excellent bend resistance and low loss.
    • The fiber exhibits robust single-mode performance under various conditions.
    • Potential applications include compact fiber lasers and amplifiers.