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D-band optical modulators using electro-optic polymer waveguides and non-coplanar patch antennas.

Takahiro Kaji, Isao Morohashi, Yukihiro Tominari

    Optics Express
    |June 29, 2023
    PubMed
    Summary

    Researchers developed D-band antenna-coupled optical modulators using electro-optic polymers. These devices efficiently convert wireless signals to optical signals for radio-over-fiber systems.

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    Area of Science:

    • Photonics and Optical Engineering
    • Materials Science
    • Wireless Communications

    Background:

    • Radio-over-fiber (RoF) systems require efficient conversion of wireless signals to optical signals.
    • Existing modulators face challenges in achieving high efficiency at high frequencies.
    • Electro-optic (EO) polymers offer promising properties for high-speed optical modulation.

    Purpose of the Study:

    • To fabricate and characterize novel antenna-coupled optical modulators operating in the D-band (110-170 GHz).
    • To investigate the performance of EO polymer waveguides integrated with non-coplanar patch antennas for wireless-to-optical signal conversion.
    • To demonstrate a viable fabrication method for high-performance RoF components.

    Main Methods:

    • Fabrication of D-band antenna-coupled optical modulators using a poled EO polymer film transfer method.

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  • Integration of EO polymer waveguides with non-coplanar patch antennas.
  • Characterization of device performance under 150 GHz electromagnetic wave irradiation.

    • Main Results:

    • Achieved a carrier-to-sideband ratio (CSR) of 42.3 dB.
    • Demonstrated an optical phase shift of 15.3 mrad.
    • Obtained these results with an irradiation power density of 34.3 W/m² at 150 GHz.

    Conclusions:

    • The developed antenna-coupled optical modulators exhibit high performance for D-band operation.
    • The fabrication method using poled EO polymer film transfer is effective for creating these devices.
    • The devices show significant potential for highly efficient wireless-to-optical signal conversion in RoF systems.