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Polarization rotator-splitters in standard active silicon photonics platforms.

Wesley D Sacher, Tymon Barwicz, Benjamin J F Taylor

    Optics Express
    |March 26, 2014
    PubMed
    Summary

    We developed silicon-on-insulator polarization management devices using a novel mode converter. These devices achieve low polarization crosstalk, enabling advanced silicon photonics applications.

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    Area of Science:

    • Photonics and Optical Engineering
    • Materials Science

    Background:

    • Silicon photonics is crucial for integrated optical circuits.
    • Efficient polarization management is essential for high-performance silicon photonic devices.

    Purpose of the Study:

    • To demonstrate novel silicon-on-insulator (SOI) polarization management structures.
    • To achieve low polarization crosstalk and wide bandwidth in these devices.
    • To integrate these structures into a functional polarization controller.

    Main Methods:

    • Design and fabrication of polarization rotator-splitters using bi-level taper TM0-TE1 mode converters on SOI platforms.
    • Integration with directional coupler polarization filters to enhance performance.
    • Incorporation of thermal tuners and PIN diode phase shifters for polarization control.

    Main Results:

    • Demonstrated a polarization rotator-splitter with polarization crosstalk below -13 dB over a 50 nm bandwidth.
    • Improved crosstalk to below -22 dB over an 80 nm bandwidth by adding directional coupler filters.
    • Successfully integrated components into a complete polarization controller.

    Conclusions:

    • The demonstrated SOI polarization management structures are compatible with standard silicon photonics processes.
    • The integrated devices offer significant improvements in polarization crosstalk and bandwidth.
    • These advancements pave the way for more sophisticated silicon photonic integrated circuits.