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    Area of Science:

    • Photonics and Optical Engineering
    • Integrated Optics
    • Waveguide Devices

    Background:

    • Microring resonators (MRRs) are crucial for optical filtering and multiplexing.
    • Achieving polarization-selectivity in MRRs is challenging but essential for advanced optical systems.
    • Existing MRR designs often lack efficient polarization discrimination.

    Purpose of the Study:

    • To design and demonstrate polarization-selective microring resonators (MRRs) for the first time.
    • To enable crossing-free, compact, and scalable multi-wavelength coherent receivers using dual polarizations.
    • To manipulate polarization-dependent bending loss and coupling ratios for selective resonance.

    Main Methods:

    • Designing polarization-selective MRRs by controlling polarization-dependent bending loss.
    • Utilizing bent directional couplers to manage coupling ratios for polarization selectivity.
    • Fabricating and testing both TM-type and TE-type MRRs.

    Main Results:

    • Demonstrated TM-type MRR acting as a wavelength-selective filter for TM polarization with suppressed TE resonance (> -50dB drop port extinction).
    • Demonstrated TE-type MRR acting as a wavelength-selective filter for TE polarization with suppressed TM resonance (~ -40dB drop port extinction).
    • Achieved very low insertion loss (< 0.5dB) at the through port for both types when the undesired polarization is input.

    Conclusions:

    • The developed polarization-selective TM- and TE-type MRRs are effective wavelength-selective optical filters.
    • These MRRs are suitable for applications requiring multiple wavelengths and dual polarizations.
    • The technology paves the way for advanced optical communication systems, including coherent receivers.