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Optical true time delay unit for multi-beamforming.

Xingwei Ye, Fangzheng Zhang, Shilong Pan

    Optics Express
    |May 14, 2015
    PubMed
    Summary
    This summary is machine-generated.

    A novel optical true time delay (TTD) unit enables independent time delays for multiple radio frequency (RF) signals using an optical frequency comb. This technology supports multi-beamforming for phased-array antennas in both transmit and receive modes.

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    Area of Science:

    • Photonics
    • Radio Frequency Engineering
    • Antenna Systems

    Background:

    • Multi-beamforming in phased-array antennas requires precise control over radio frequency (RF) signal delays.
    • Existing true time delay (TTD) methods face challenges in achieving independent and wide-range delay control for multiple signals.

    Purpose of the Study:

    • To propose and demonstrate a novel optical true time delay (TTD) unit for multi-beamforming applications.
    • To enable independent and controllable time delays for multiple RF signals with different center frequencies.

    Main Methods:

    • Modulating multiple RF signals onto an optical frequency comb (OFC).
    • Utilizing a dispersive element and tunable optical filters to introduce chromatic dispersion for independent TTD.
    • Integrating microwave photonic filters (MPFs) in each path to select specific RF signals.

    Main Results:

    • A proof-of-concept two-path TTD unit was successfully built and tested.
    • Independently controllable TTDs up to approximately 1.4 ns with a step of 69 ps were achieved using a 25-GHz-spacing OFC.
    • A wideband multi-beam phased-array antenna system design incorporating the TTD unit was presented.

    Conclusions:

    • The proposed optical TTD unit offers a viable solution for independent time delay control in multi-beamforming systems.
    • The technology is suitable for both transmit and receive modes in advanced phased-array antenna applications.
    • This approach enhances the flexibility and performance of RF signal processing in photonic systems.