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Highly efficient silicon optical polarization rotators based on mode order conversions.

Daigao Chen, Xi Xiao, Lei Wang

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    Summary
    This summary is machine-generated.

    We developed new silicon optical polarization rotators using TM-TE mode conversion. These devices achieve low insertion loss and high extinction ratios, advancing integrated photonics.

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    Area of Science:

    • Photonics and Optical Engineering
    • Integrated Optics
    • Semiconductor Devices

    Background:

    • Silicon photonics enables compact optical circuits.
    • Efficient polarization control is crucial for optical systems.
    • Existing polarization rotators face challenges in performance and integration.

    Purpose of the Study:

    • To design and demonstrate novel silicon optical polarization rotators.
    • To achieve efficient polarization conversion using TM-TE mode conversion.
    • To minimize insertion loss and maximize polarization extinction ratio.

    Main Methods:

    • Utilizing TM(0)-TE(n)-TE(0) mode conversions within silicon waveguides.
    • Employing mode hybridization in tapered rib waveguides for TM(0)-TE(n) conversion.
    • Implementing beam shaping methods for TE(n)-TE(0) conversion.

    Main Results:

    • Demonstrated polarization rotators with insertion losses below 1 dB.
    • Achieved polarization extinction ratios exceeding 18 dB across a 100 nm wavelength range.
    • Successfully used TE(1), TE(2), and TE(3) modes as transitional modes.

    Conclusions:

    • The novel silicon optical polarization rotators offer high performance.
    • The demonstrated devices are suitable for integrated photonic applications.
    • This work contributes to the advancement of silicon photonics.