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Parity-time symmetry in wavelength space within a single spatial resonator

Author

Listed:
  • Jiejun Zhang

    (Jinan University)

  • Lingzhi Li

    (Jinan University)

  • Guangying Wang

    (Jinan University)

  • Xinhuan Feng

    (Jinan University)

  • Bai-Ou Guan

    (Jinan University)

  • Jianping Yao

    (Jinan University
    University of Ottawa)

Abstract

We show a parity-time (PT) symmetric microwave photonic system in the optical wavelength space within a single spatial resonator, in which the gain and loss modes can perfectly overlay spatially but are distinguishable in the designated parameter space. To prove the concept, a PT-symmetric optoelectronic oscillator (OEO) in the optical wavelength space is implemented. The OEO has a single-loop architecture, with the microwave gain and loss modes carried by two optical wavelengths to form two mutually coupled wavelength-space resonators. The operation of PT symmetry in the OEO is verified by the generation of a 10-GHz microwave signal with a low phase noise of −129.3 dBc/Hz at 10-kHz offset frequency and small sidemodes of less than −66.22 dBc/Hz. Compared with a conventional spatial PT-symmetric system, a PT-symmetric system in the wavelength space features a much simpler configuration, better stability and greater resilience to environmental interferences.

Suggested Citation

  • Jiejun Zhang & Lingzhi Li & Guangying Wang & Xinhuan Feng & Bai-Ou Guan & Jianping Yao, 2020. "Parity-time symmetry in wavelength space within a single spatial resonator," Nature Communications, Nature, vol. 11(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:11:y:2020:i:1:d:10.1038_s41467-020-16705-8
    DOI: 10.1038/s41467-020-16705-8
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    Cited by:

    1. Weijie Liu & Quancheng Liu & Xiang Ni & Yuechen Jia & Klaus Ziegler & Andrea Alù & Feng Chen, 2024. "Floquet parity-time symmetry in integrated photonics," Nature Communications, Nature, vol. 15(1), pages 1-7, December.

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