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Compact polarization splitter based on a silicon angled multimode interferometer structure.

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    This summary is machine-generated.

    This study demonstrates a novel silicon-on-insulator polarization splitter using an angled multimode interferometer. It achieves high performance with low loss and excellent extinction ratios for integrated photonic applications.

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    Area of Science:

    • Photonics
    • Integrated Optics
    • Semiconductor Devices

    Background:

    • Polarization splitting is crucial for integrated photonic circuits.
    • Existing methods often face challenges with size, loss, or fabrication complexity.
    • Silicon-on-insulator (SOI) is a key platform for photonic integration.

    Purpose of the Study:

    • To develop a compact and efficient polarization splitter on the SOI platform.
    • To leverage the effective index difference between TE and TM modes in an angled multimode interferometer.
    • To achieve practical polarization splitting at 1550 nm.

    Main Methods:

    • Utilizing an angled multimode interferometer (MMI) structure.
    • Simulating the performance of transverse electric (TE) and transverse magnetic (TM) modes.
    • Analyzing key performance metrics including insertion loss, extinction ratio, and crosstalk.

    Main Results:

    • Achieved low insertion loss (0.4 dB for TE, 0.8 dB for TM).
    • Demonstrated high extinction ratios (27.6 dB for TE, 26.5 dB for TM).
    • Reported low crosstalk (-27.3 dB for TE, -28.0 dB for TM) and a 53-nm bandwidth for ER > 20 dB.

    Conclusions:

    • The proposed device offers competitive polarization splitting performance.
    • Its compact footprint (∼25 μm²) and simple integration are significant advantages.
    • This design presents a practical solution for polarization management in SOI photonic circuits.