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    A novel dual-loop optoelectronic oscillator (OEO) uses a self-polarization-stabilization technique for improved stability and phase noise. This method enhances performance in intensity modulator-based OEO systems and offers a compact design.

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    Area of Science:

    • Photonics
    • Optoelectronics
    • Optical Engineering

    Background:

    • Optoelectronic oscillators (OEOs) are crucial for high-frequency signal generation.
    • Traditional OEOs face challenges with polarization stability and phase noise.
    • Intensity modulators (IMs) in OEOs can suffer from DC bias drifting.

    Purpose of the Study:

    • To demonstrate a novel dual-loop OEO with self-polarization-stabilization.
    • To improve phase noise performance and system stability.
    • To address DC bias drifting in IM-based OEOs.

    Main Methods:

    • Utilizing a dual-loop configuration with Faraday rotators and mirrors for self-polarization stabilization.
    • Employing round-trip transmission in each loop to halve fiber length.
    • Implementing a phase modulation to intensity modulation convertor using a polarization-dependent phase modulator and polarizer.

    Main Results:

    • Achieved a phase noise of -114.1 dBc/Hz at 10 kHz offset for a 10 GHz carrier.
    • Improved side mode suppression ratio to 63 dB.
    • Demonstrated superior phase noise performance compared to traditional polarization multiplexing methods.

    Conclusions:

    • The proposed dual-loop OEO with self-polarization stabilization offers enhanced stability and phase noise performance.
    • The novel phase modulation to intensity modulation conversion method effectively mitigates DC bias drifting.
    • This technique provides a compact and stable solution for high-performance OEOs.