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    Area of Science:

    • Optics and Photonics
    • Laser Technology
    • Signal Processing

    Background:

    • Generating broadband light with a narrow linewidth is crucial for applications like optical communications and spectroscopy.
    • Existing methods for producing linearly chirped light often face limitations in bandwidth, linewidth, or complexity.

    Purpose of the Study:

    • To propose and experimentally demonstrate an external modulation method for generating linearly chirped light with broadband characteristics and a narrow instantaneous linewidth.
    • To present a novel chirped light source combining an optical recirculating frequency shifter loop and an optical frequency linear sweeper.

    Main Methods:

    • An external modulation approach was employed, integrating an optical recirculating frequency shifter loop with an optical frequency linear sweeper.
    • The system was designed to achieve precise control over the frequency chirp of the generated light signal.

    Main Results:

    • A linearly chirped light signal was successfully generated over a broad frequency range of 200 GHz.
    • The achieved chirp rate was 3.6 x 10^16 Hz/s.
    • The instantaneous linewidth of the generated chirped light was measured to be less than 50 kHz, indicating high spectral purity.

    Conclusions:

    • The proposed external modulation method effectively generates broadband, narrow-linewidth linearly chirped light.
    • The experimental demonstration validates the capability of the combined optical recirculating frequency shifter loop and linear sweeper system.
    • This advancement offers a promising solution for applications requiring high-performance chirped light sources.