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TE/TM mode electro-optic conversion based on a titanium diffusion lithium niobate waveguide with a

Yang Li, Zuoxin Yang, Huajiang Chen

    Applied Optics
    |December 1, 2023
    PubMed
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    We developed an electro-optic polarization mode converter using titanium-diffused lithium niobate (LN) waveguides and PANDA polarization-maintaining optical fibers (PMFs). This device enables efficient transverse electric (TE) to transverse magnetic (TM) mode conversion with wavelength tunability for enhanced optical communication.

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    Area of Science:

    • Photonics
    • Materials Science
    • Optical Engineering

    Background:

    • Lithium niobate (LN) optical waveguide technology is crucial for photonic integrated circuits.
    • Titanium (Ti)-diffused LN waveguides are fundamental for electro-optic (EO) devices.
    • Polarization conversion enhances optical transmission effectiveness and capacity.

    Purpose of the Study:

    • To present an electro-optic (EO) polarization mode converter.
    • To utilize PANDA polarization-maintaining optical fibers (PMFs) for broadband wavelength applications.
    • To achieve wavelength tunability and multiwavelength modulation.

    Main Methods:

    • Fabrication of Ti-diffused LN waveguides.
    • Packaging with PANDA PMFs for broadband operation (1440-1620 nm).
    • Characterization of TE to TM mode conversion efficiency and frequency response.

    Main Results:

    • Efficient TE to TM mode conversion achieved with applied voltage.
    • Broadband operation across 1440-1620 nm with wavelength tunability.
    • High-frequency response (~600 MHz) and insertion loss below 5 dB.

    Conclusions:

    • The developed EO polarization mode converter demonstrates high performance for optical communication.
    • LN-based polarization devices are promising for chip-integrated polarization telecommunication systems.
    • The device offers efficient mode conversion and broadband tunability.