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Simple microwave photonic downconversion channelizer based on multi-wavelength laser sources.

Qianqian Jia, Jinye Li, Liangchen Sun

    Applied Optics
    |October 18, 2022
    PubMed
    Summary

    This study introduces a novel microwave photonic channelizer using multi-wavelength laser diodes for efficient radio frequency (RF) signal processing. The system achieves stable, multichannel downconversion with excellent performance, showing potential for advanced communication systems.

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    Area of Science:

    • Photonics
    • Microwave Engineering
    • Signal Processing

    Background:

    • Traditional radio frequency (RF) channelizers face limitations in bandwidth and processing capabilities.
    • Microwave photonic technologies offer a promising alternative for high-frequency signal processing due to their inherent advantages.
    • Developing efficient and reconfigurable channelizers is crucial for modern communication and electronic warfare systems.

    Purpose of the Study:

    • To propose and demonstrate a simple, reconfigurable microwave photonic channelizer for broadband RF signal downconversion.
    • To leverage multi-wavelength laser diode arrays for simultaneous multichannel processing.
    • To evaluate the system's performance in terms of downconversion accuracy, channel uniformity, and image rejection.

    Main Methods:

    • Utilizing two laser diode (LD) arrays for signal multiplexing and generating multi-frequency combs.
    • Implementing a downconversion channelizer architecture for broadband RF signals (14.375-17.75 GHz).
    • Replacing optical filters with electrical filters for a hybrid optoelectronic reconfigurable system.

    Main Results:

    • Successfully downconverted broadband RF signals into four 875 MHz subchannels at a common intermediate frequency (IF).
    • Achieved excellent image rejection (>28 dB) and channel uniformity, consistent with simulation results.
    • Demonstrated a spurious-free dynamic range (SFDR) of 100 dBHz^(2/3) and a frequency measurement error < ±6 MHz.

    Conclusions:

    • The proposed optoelectronic hybrid reconfigurable microwave photonic channelizer offers a simple and stable solution.
    • The system exhibits high maturity and meets application requirements for radar, satellite communication, and electronic warfare.
    • This technology presents significant potential for future high-performance RF signal processing applications.