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Photonic instantaneous frequency measurement using a dense wavelength-division multiplexer.

Xiangrui Li, Aijun Wen, Xiaoyang Li

    Applied Optics
    |October 6, 2021
    PubMed
    Summary

    This study introduces a novel photonic instantaneous frequency measurement receiver. It achieves high accuracy and a wide measurement range for microwave signals using a dense wavelength-division multiplexer filter.

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    Area of Science:

    • Photonics
    • Microwave Engineering
    • Optical Signal Processing

    Background:

    • Accurate and wide-range instantaneous frequency measurement (IFM) is crucial for various applications, including electronic warfare and radar systems.
    • Traditional IFM techniques often face limitations in terms of measurement range, accuracy, or complexity.
    • Photonic approaches offer potential advantages for high-performance IFM due to the inherent high bandwidth of optical components.

    Purpose of the Study:

    • To propose and experimentally demonstrate a novel photonic instantaneous frequency measurement receiver.
    • To leverage frequency-to-optical power mapping for accurate microwave signal analysis.
    • To achieve a wide measurement range and high accuracy simultaneously without complex multi-step operations.

    Main Methods:

    • Utilizing a channel of a dense wavelength-division multiplexer (DWDM) as a quasi-linear optical filter for frequency-to-power conversion.
    • Employing a stable laser source and a bias controller to ensure consistent performance.
    • Establishing a power ratio function based on the microwave signal's frequency and the DWDM filter's characteristics.

    Main Results:

    • The proposed receiver demonstrated accurate instantaneous frequency measurements over a broad range (1-40 GHz).
    • A high measurement accuracy of 0.2% of the signal frequency was achieved.
    • Stable performance was maintained over an experimental duration of 1.5 hours.

    Conclusions:

    • The demonstrated photonic IFM receiver offers a promising solution for high-performance frequency measurement applications.
    • The use of a DWDM filter provides a unique advantage with its smooth, quasilinear roll-off characteristics.
    • Simultaneous achievement of wide measurement range and high accuracy without multi-step operations marks a significant advancement.