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    We developed a novel microwave photonic 2D time-frequency filter using a photonic time-frequency prism. This filter can separate complex chirp signals with overlapping spectra, offering reconfigurable speed and bandwidth.

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    Area of Science:

    • Photonics
    • Microwave Engineering
    • Signal Processing

    Background:

    • Traditional frequency filters struggle with complex signals.
    • Time-varying frequency responses are crucial for advanced signal processing.

    Purpose of the Study:

    • To propose and demonstrate a novel microwave photonic 2D time-frequency filter.
    • To achieve reconfigurable frequency-sweeping speed and bandwidth.

    Main Methods:

    • Utilized a photonic time-frequency prism to create a time-varying frequency response.
    • Deviated the passband of a 1D frequency filter in the 2D time-frequency plane.
    • Employed software-defined control for reconfigurability.

    Main Results:

    • Successfully demonstrated the separation of multiple linear and nonlinear chirp signals.
    • Achieved highly reconfigurable frequency-sweeping speed and bandwidth.
    • Validated the filter's performance in separating signals with overlapped spectra.

    Conclusions:

    • The proposed photonic time-frequency prism enables a novel 2D time-frequency filter.
    • The filter offers significant advantages in reconfigurability for signal processing applications.
    • This technique is effective for separating complex chirp signals.