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Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities
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Compact silicon TE-pass polarizer using adiabatically-bent fully-etched waveguides.

Humaira Zafar, Paulo Moreira, Ayat M Taha

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    This study introduces a compact silicon TE-pass polarizer using adiabatic waveguide bends. It achieves high extinction ratios and low insertion loss, crucial for integrated photonics.

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    Area of Science:

    • Photonics
    • Integrated Optics
    • Materials Science

    Background:

    • Polarizers are essential components in photonic integrated circuits (PICs) for controlling light polarization.
    • Existing polarizers often face challenges with size, insertion loss, or fabrication complexity.
    • Silicon photonics offers a scalable platform for advanced optical functionalities.

    Purpose of the Study:

    • To propose and demonstrate a high-performance, compact TE-pass polarizer on a silicon-on-insulator (SOI) platform.
    • To achieve high extinction ratio for TM polarization and low insertion loss for TE polarization.
    • To analyze the trade-off between device footprint and performance characteristics.

    Main Methods:

    • Design and fabrication of a silicon TE-pass polarizer utilizing a series of adiabatic waveguide bends.
    • Implementation on a silicon-on-insulator platform with a 220 nm silicon layer thickness.
    • Experimental characterization of insertion loss and extinction ratio across a 1.5 μm to 1.6 μm wavelength range.

    Main Results:

    • Demonstrated insertion loss of ≤ 0.37 dB (average 0.12 dB) for TE polarization.
    • Achieved extinction ratio of ≥ 27.6 dB (average 36.0 dB) for TM polarization.
    • Device footprint achieved is 63 μm × 9.5 μm, establishing a clear performance-footprint trade-off.

    Conclusions:

    • The proposed adiabatic bend-based silicon TE-pass polarizer offers excellent performance without complex fabrication.
    • The demonstrated device is suitable for various integrated photonic applications requiring efficient polarization control.
    • The design concept is adaptable to other waveguide geometries and integrated photonic platforms.