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The mode is one of the commonly used measures of a central tendency. It is defined as the most frequent value in a data set.
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High-order mode conversion based on adiabatical mode evolution for mode division multiplexing applications.

Ming-Yang Chen, Guo-Dong Cao, Yan-Qun Tong

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    This study demonstrates a flexible two-core fiber configuration for efficient mode conversion. It can transform all input modes to higher-order or lower-order modes, offering high fabrication tolerance for optical systems.

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    Area of Science:

    • Optics and Photonics
    • Fiber Optics
    • Waveguide Technology

    Background:

    • Mode conversion is crucial for advanced optical signal processing and communication systems.
    • Existing methods often require precise fabrication and lack flexibility in mode manipulation.
    • Adiabatic mode evolution in coupled waveguides offers a promising avenue for controlled mode conversion.

    Purpose of the Study:

    • To investigate mode conversion using adiabatic mode evolution in a novel two-core fiber configuration.
    • To demonstrate the capability of this configuration for both higher-order and lower-order mode conversion.
    • To analyze the dependence of mode conversion on the effective mode indices of the two cores.

    Main Methods:

    • Numerical simulation of light propagation in a two-core fiber structure.
    • Analysis of adiabatic mode evolution principles applied to the coupled waveguide system.
    • Investigation of mode conversion efficiency by varying the relationship between effective mode indices.

    Main Results:

    • The proposed two-core configuration successfully converts all launching modes to higher-order modes from one port.
    • The same configuration demonstrates conversion of all launching modes to lower-order modes from another port.
    • Numerical demonstration of mode conversion between two degenerated high-order modes is achieved.

    Conclusions:

    • The two-core configuration provides a highly flexible platform for versatile mode conversion.
    • The mode conversion performance is primarily dependent on the effective mode index relationship between the cores.
    • The design exhibits large fabrication tolerance, making it practical for real-world applications.