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Multiport all-logic optical switch based on thermally altered light paths in a multimode waveguide.

Zhangqi Dang, Tao Chen, Zhenming Ding

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    |July 1, 2021
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    Summary
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    A novel optical switch uses microheaters to control light in multimode waveguides, enabling all-logic outputs for photonic signal processing. This compact, scalable device offers polarization-insensitive and colorless operation.

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    Area of Science:

    • Photonics
    • Optical Engineering
    • Materials Science

    Background:

    • Advanced optical switches are crucial for complex photonic integrated circuits.
    • Existing technologies face limitations in achieving all-logic outputs and scalability.

    Purpose of the Study:

    • To demonstrate a generic multiport optical switch capable of all-logic outputs.
    • To introduce the design principles and fabrication of such a device.

    Main Methods:

    • Utilizing microheaters to alter mode profiles and propagation in multimode waveguides.
    • Employing heat solvers and the eigenmode expansion method for simulation.
    • Fabricating a 3-bit all-logic switch on a polymer waveguide platform.

    Main Results:

    • Experimental results align with simulations.
    • Achieved polarization-insensitive and colorless operation from 1520 to 1600 nm.
    • Extinction ratio between 'On' and 'Off' states exceeds 11.9 dB, with low heat power consumption (max 43.9 mW).

    Conclusions:

    • The demonstrated optical switch is simple, compact, and scalable.
    • It holds promise for constructing various switch networks (1xN, MxN).
    • Potential applications include on-chip photonic signal processing and computation.