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    Area of Science:

    • Photonics
    • Integrated Optics
    • Laser Physics

    Background:

    • Photonic integrated circuits (PICs) are crucial for miniaturizing optical systems.
    • Tunable light sources are essential for applications like spectroscopy and communications.
    • Generating optical frequency combs typically requires complex setups.

    Purpose of the Study:

    • To demonstrate a tunable optical frequency comb source on a monolithically integrated PIC.
    • To achieve comb generation via gain switching within a two-section laser.
    • To validate the performance of the integrated comb source over a specific wavelength and frequency range.

    Main Methods:

    • Design and fabrication of a two-section, monolithically integrated laser on a PIC.
    • Utilizing gain switching in one laser section to generate the optical comb.
    • Characterizing the single-mode tunable spectrum and the generated frequency comb.

    Main Results:

    • A single-mode tunable spectrum was achieved across the 1543 - 1565 nm range.
    • Frequency combs with a range of 1 - 10 GHz were successfully generated.
    • Phase coherence of the comb was maintained without additional optical injection.

    Conclusions:

    • The demonstrated PIC provides a compact and tunable optical frequency comb source.
    • Gain switching is an effective method for integrated comb generation.
    • This technology offers potential for advanced optical signal processing and sensing applications.