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Single-loop tunable PT-symmetric optoelectronic oscillator based on a phase modulator.

Jiahong Zhang, Yao Wang, Qihong Ding

    Applied Optics
    |January 31, 2024
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    Summary

    This study introduces a tunable parity-time (PT) symmetric optoelectronic oscillator (OEO) using a dual-mode phase modulator and microwave photonic filter. It achieves wide frequency tuning and high performance for advanced photonic applications.

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    Area of Science:

    • Photonics
    • Optoelectronics
    • Nonlinear Optics

    Background:

    • Optoelectronic oscillators (OEOs) are crucial for high-frequency signal generation.
    • Parity-time (PT) symmetry offers unique properties for optical systems.
    • Tuning and stability are key challenges in OEO design.

    Purpose of the Study:

    • To propose and design a single-loop tunable PT-symmetric OEO.
    • To demonstrate frequency tunability using a microwave photonic filter (MPF).
    • To analyze the performance metrics including side-mode suppression ratio (SMSR) and phase noise.

    Main Methods:

    • Utilizing a dual-mode optical phase modulator (PM) to create a PT-symmetric structure.
    • Controlling the PM's two-mode splitting ratio via polarization angle adjustment.
    • Employing a stimulated Brillouin scattering (SBS)-based MPF for frequency tuning by adjusting pump light wavelength.

    Main Results:

    • Achieved a PT-symmetric structure within a single physical loop.
    • Demonstrated fine frequency tuning accuracy of 12.5 MHz by adjusting pump wavelength in 0.0001 nm steps.
    • Obtained a wide output frequency tunability from 0.9 to 22 GHz.
    • Reported an SMSR of 53 dB and phase noise of -133.8 dBc/Hz at 10 kHz offset.

    Conclusions:

    • The proposed single-loop tunable PT-symmetric OEO offers a novel approach for flexible frequency control.
    • The design integrates PT symmetry and MPF for enhanced OEO performance.
    • This work paves the way for advanced tunable microwave photonic systems.