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Demonstration of Spin-Multiplexed and Direction-Multiplexed All-Dielectric Visible Metaholograms
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Mode multiplexer based on integrated horizontal and vertical polymer waveguide couplers.

Jiangli Dong, Kin Seng Chiang, Wei Jin

    Optics Letters
    |July 1, 2015
    PubMed
    Summary

    We developed a polymer waveguide mode demultiplexer for optical communications. This device efficiently separates light signals, enabling higher data transmission in mode-division-multiplexing systems.

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    Area of Science:

    • Optoelectronics
    • Photonics
    • Waveguide Optics

    Background:

    • Mode-division multiplexing (MDM) is crucial for increasing optical communication capacity.
    • Efficient mode demultiplexers are required to separate individual modes in MDM systems.

    Purpose of the Study:

    • To demonstrate a novel mode demultiplexer using cascaded polymer waveguide directional couplers.
    • To achieve efficient separation of LP(01) and LP(11) modes with low crosstalk and loss.

    Main Methods:

    • Fabrication of two cascaded few-mode polymer waveguide directional couplers on a single substrate.
    • Utilizing horizontal and vertical coupler designs with identical core sizes.
    • Incorporating a biconical taper to suppress unwanted LP(11) modes.

    Main Results:

    • Achieved a coupling ratio higher than 96% over a 1530-1570 nm wavelength range.
    • Demonstrated negligible crosstalk to the LP(01) channel and low crosstalk (< -13.4 dB) to LP(11) channels.
    • Observed polarization-insensitive operation with propagation losses of approximately 2.0 dB/cm.

    Conclusions:

    • The fabricated mode demultiplexer shows high performance for separating optical modes.
    • The device is suitable for polarization-insensitive operation in mode-division-multiplexing systems.
    • This technology offers a promising solution for next-generation optical networks.