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

Jiejun Zhang (), Lingzhi Li, Guangying Wang, Xinhuan Feng, Bai-Ou Guan and Jianping Yao ()
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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

Nature Communications, 2020, vol. 11, issue 1, 1-7

Abstract: 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.

Date: 2020
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DOI: 10.1038/s41467-020-16705-8

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