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On-chip switchable and reconfigurable optical mode exchange device using cascaded three-waveguide-coupling switches.

Xu Han, Zhenfu Zhang, Junbo Yang

    Optics Express
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    We developed a novel device for flexible data exchange in optical networks. This switchable device enables arbitrary two-mode channel communication in mode-division multiplexing (MDM) networks with low loss and crosstalk.

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    Area of Science:

    • Photonics and Optical Communications
    • Integrated Optics
    • Waveguide Devices

    Background:

    • Optical networks require flexible data exchange capabilities for advanced functionalities.
    • Mode-division multiplexing (MDM) offers increased data capacity by utilizing different spatial modes within optical fibers.
    • Existing solutions for mode manipulation in MDM networks can be complex and lack reconfigurability.

    Purpose of the Study:

    • To propose and demonstrate a novel switchable and reconfigurable data exchange device for optical mode channels.
    • To enable arbitrary data exchange between any two optical mode channels within an MDM network.
    • To achieve high performance in terms of low insertion loss and low mode crosstalk.

    Main Methods:

    • Numerical analysis of three-waveguide-coupling (TWC) switches using coupled supermode theory.
    • Experimental demonstration of switchable data exchange between the first three-order quasi-transverse electric modes.
    • Characterization of device performance, including insertion loss and mode crosstalk.

    Main Results:

    • Successful experimental demonstration of switchable data exchange between arbitrary two mode channels.
    • Insertion losses were measured to be less than 5.6 dB, including multiplexer and demultiplexer coupling losses.
    • Mode crosstalk was maintained below -13.0 dB for all demonstrated functions.

    Conclusions:

    • The proposed TWC-based device provides a flexible and reconfigurable solution for data exchange in MDM networks.
    • The device exhibits low insertion loss and low mode crosstalk, making it suitable for practical applications.
    • The design shows good scalability, offering potential for integration into complex on-chip MDM systems.