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Compact substrate-removed thin-film lithium niobate electro-optic modulator featuring polarization-insensitive

Ying Pan, Mingbo He, Mengyue Xu

    Optics Letters
    |April 1, 2022
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    Summary

    We developed a compact, polarization-insensitive electro-optic modulator using thin-film lithium niobate. This device is ideal for advanced wireless networks like 5G and 6G, enabling remote laser and modulator placement.

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    Area of Science:

    • Photonics and Optical Engineering
    • Materials Science
    • Telecommunications Engineering

    Background:

    • Compact, polarization-insensitive electro-optic (EO) modulators are crucial for 5G and 6G wireless networks.
    • Existing EO modulators often struggle with polarization sensitivity, limiting their application in fiber-interconnected systems.

    Purpose of the Study:

    • To propose and demonstrate a novel polarization-insensitive EO modulator.
    • To enable flexible integration of lasers and modulators in advanced wireless communication systems.

    Main Methods:

    • Fabrication of a modulator using substrate-removed thin-film lithium niobate.
    • Experimental characterization of polarization-dependent loss and on-chip loss.
    • Demonstration of polarization insensitivity using 50 Gbaud four-level pulse-amplitude modulation.

    Main Results:

    • The proposed device exhibits a low polarization-dependent loss of 0.35 dB.
    • On-chip loss was measured to be approximately 2 dB.
    • Experimental validation confirmed polarization insensitivity at 100 Gb/s.

    Conclusions:

    • The substrate-removed thin-film lithium niobate modulator offers a viable solution for polarization-insensitive modulation.
    • This technology supports the high-speed data transmission requirements of future wireless networks.
    • The device facilitates remote laser-modulator configurations via standard single-mode fiber.