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Microwave Photonics Systems Based on Whispering-gallery-mode Resonators
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High-efficiency microwave photonic harmonic down-conversion with tunable and reconfigurable filtering.

Jinxin Liao, Xiaoping Zheng, Shangyuan Li

    Optics Letters
    |December 10, 2014
    PubMed
    Summary

    We developed a novel optical-frequency comb system for high-frequency signal down-conversion. This technology enables tunable filtering for clear, high-quality intermediate-frequency signals with high conversion efficiency.

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    Area of Science:

    • Photonics
    • Microwave Engineering
    • Signal Processing

    Background:

    • Traditional methods for ultrahigh radio frequency (RF) signal processing face limitations in efficiency and tunability.
    • The need for advanced photonic solutions is growing for next-generation communication systems.

    Purpose of the Study:

    • To propose and demonstrate a new microwave photonic harmonic down-convertor using an optical-frequency comb.
    • To achieve tunable and reconfigurable filtering for intermediate-frequency (IF) signals.

    Main Methods:

    • Utilizing coherent, evenly spaced optical carriers from an optical-frequency comb for harmonic down-conversion.
    • Implementing a tunable and reconfigurable bandpass filter for the IF signal by combining optical carriers with dispersion.
    • Experimental demonstration and performance evaluation of the proposed system.

    Main Results:

    • Successful experimental demonstration of the optical-frequency comb-based down-convertor.
    • Achieved high conversion efficiency with a measured conversion loss of 8.3 dB without external electrical amplification.
    • Obtained a clean spectrum with high quality for the filtered output IF signal.

    Conclusions:

    • The proposed system offers an efficient and flexible approach for ultrahigh RF signal down-conversion.
    • The tunable and reconfigurable filtering capability enhances the system's applicability in diverse communication scenarios.
    • This optical-frequency comb-based approach represents a significant advancement in microwave photonic signal processing.