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Instantaneous frequency measurement system based on quantum dash mode-locked laser.

Yuxuan Xie, Mostafa Khalil, Jiaren Liu

    Optics Express
    |June 11, 2024
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces a microwave photonic (MWP) filter system for instantaneous frequency measurement. Using a quantum dash laser and comb shaping, it achieves high accuracy up to 20 GHz.

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    Area of Science:

    • Photonics
    • Optical Engineering
    • Signal Processing

    Background:

    • Instantaneous frequency measurement (IFM) is crucial for various applications.
    • Existing IFM systems face limitations in speed and accuracy.
    • Microwave photonic (MWP) systems offer potential for high-performance IFM.

    Purpose of the Study:

    • To develop and experimentally validate a novel MWP filter-based system for instantaneous frequency measurement.
    • To demonstrate the system's capability using a quantum dash mode-locked laser as an optical frequency comb source.
    • To analyze the system's performance in terms of measurement range and accuracy.

    Main Methods:

    • Utilized a quantum dash mode-locked laser to generate a stable optical frequency comb with up to 41 flat comb lines.
    • Implemented a real-time feedback loop for precise comb shaping.
    • Designed and tested a set of MWP filters with linear frequency responses (linear and dB units).

    Main Results:

    • Experimentally demonstrated MWP filters with linear frequency responses.
    • Achieved a maximum measurement frequency of up to 20 GHz, limited by instrumentation.
    • Reduced root-mean-square error from 51-66 MHz (one filter) to 42.2 MHz (linear unit) and 30.7 MHz (dB unit) using two filters.

    Conclusions:

    • The developed MWP filter system enables accurate instantaneous frequency measurement.
    • The system shows improved accuracy with the use of two MWP filters.
    • This technology has potential for advanced signal processing and measurement applications.