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Orthogonal coding-based spatial channel switching: breaking the dimensionality barrier in optical multiplexing

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    This study introduces a new optical orthogonal coding (OC) method for spatial channel switching in WDM and SDM systems. The developed device simplifies switching operations and enhances scalability for optical communications.

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    Area of Science:

    • Optical communication systems
    • Photonics
    • Signal processing

    Background:

    • Spatial channel-switching devices are crucial for multi-channel wavelength-division multiplexing (WDM) and space-division multiplexing (SDM) optical systems.
    • Current devices face challenges in operational complexity and scalability.

    Purpose of the Study:

    • To propose a novel optical orthogonal coding (OC) mode construction method for spatial channel switching.
    • To develop a simplified and scalable spatial channel-switching device for optical communication systems.

    Main Methods:

    • Developed an OC mode construction method using phase-gradient coding.
    • Mapped the coding method to dispersed spatial channels in a fiber array.
    • Designed a spatial channel-switching device comprising a fiber array, mode converter, and channel-switching plane.
    • Experimentally demonstrated a bidirectional mode converter with five phase masks.

    Main Results:

    • Successfully switched seven spatial channels with corresponding phase distributions.
    • The OC-based device eliminated the need for phase adjustments in specific regions.
    • Demonstrated simplified operational complexity for the channel-switching process.

    Conclusions:

    • The proposed OC-based spatial channel-switching device enhances channel scalability and system performance.
    • This approach offers a viable solution to overcome the dimensionality barrier in optical multiplexing systems.