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W-band optical modulators using electro-optic polymer waveguides and patch antenna arrays.

Takahiro Kaji, Isao Morohashi, Yukihiro Tominari

    Optics Express
    |October 7, 2021
    PubMed
    Summary

    Researchers developed novel W-band antenna-coupled optical modulators using electro-optic polymers. These devices demonstrate efficient wireless-to-optical signal conversion for radio-over-fiber systems.

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    Area of Science:

    • Optoelectronics
    • Materials Science
    • Telecommunications Engineering

    Background:

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

    Purpose of the Study:

    • To fabricate and characterize W-band antenna-coupled optical modulators.
    • To investigate the performance of EO polymer waveguides in conjunction with patch antenna arrays.
    • To assess the potential for efficient wireless-optical signal conversion.

    Main Methods:

    • Fabrication of modulators using a transfer and bonding method for poled EO polymer films.
    • Integration of cyclo-olefin polymer (COP) lower cladding and an EO polymer waveguide.

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  • Utilizing a gap-embedded patch antenna array for W-band operation.
  • Testing device performance under 100 GHz electromagnetic wave irradiation.

    • Main Results:

    • Achieved a carrier-to-sideband ratio (CSR) of 56 dB.
    • Demonstrated an optical phase shift of 3 mrad.
    • Operated devices under 100 GHz electromagnetic waves with a power density of 12.8 W/m².

    Conclusions:

    • The fabricated W-band antenna-coupled optical modulators show high performance.
    • The devices enable efficient wireless-optical signal conversion.
    • These modulators hold significant potential for advanced RoF systems.