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Ultra-flat multicarrier light source based on recirculating frequency shift loop driven by a parity-time symmetric

Jiaxin Zhou, Xinrui Ban, Jie Zhang

    Applied Optics
    |September 14, 2023
    PubMed
    Summary

    A novel multicarrier light source uses a parity-time (PT)-symmetric optoelectronic oscillator (OEO) to drive a recirculating frequency shift loop (RFSL). This system optimizes phase noise and flatness for compact multicarrier generation.

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    Area of Science:

    • Optoelectronics
    • Photonics
    • Signal Processing

    Background:

    • Advanced light sources are crucial for high-capacity optical communication systems.
    • Existing methods often face challenges with phase noise, flatness, and system size.
    • Parity-time (PT)-symmetric systems offer unique properties for signal generation.

    Purpose of the Study:

    • To propose and demonstrate a novel multicarrier light source.
    • To investigate the impact of radio frequency (RF) signal side-mode suppression ratio (SMSR) on multicarrier performance.
    • To achieve optimized phase noise, flatness, and system miniaturization.

    Main Methods:

    • Utilizing a recirculating frequency shift loop (RFSL) driven by a PT-symmetric optoelectronic oscillator (OEO).
    • Experimentally generating a 10.019 GHz RF signal with a 42 dB SMSR.
    • Analyzing the phase noise and flatness of the generated multicarrier signal.

    Main Results:

    • Achieved a phase noise of -98.63 dBc/Hz at 10 kHz offset frequency (actual noise < -122.87 dBc/Hz).
    • Generated up to 120 subcarriers with a flatness of 2.32 dB.
    • Demonstrated a total bandwidth coverage of approximately 1.2 THz.

    Conclusions:

    • The proposed PT-symmetric OEO-driven RFSL is an effective method for generating high-performance multicarrier light.
    • The system offers significant improvements in phase noise and flatness, enabling system miniaturization.
    • This approach advances the development of compact and efficient multicarrier light sources for optical systems.