Observation of parity-time symmetry in microwave photonics

Yanzhong Liu; Tengfei Hao; Wei Li; Jose Capmany; Ninghua Zhu; Ming Li

doi:10.1038/s41377-018-0035-8

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Observation of parity-time symmetry in microwave photonics

Original Articles

- Observation of parity-time symmetry in microwave photonics
- Observation of parity-time symmetry in microwave photonics
- 光：科学与应用 2018年7卷第5期页码：379-387
- Affiliations：
  
  1.State Key Laboratory on Integrated Optoelectronics, Institute of Semiconductors, Chinese Academy of Sciences, Beijing, 100083, China
  2.School of Electronic, Electrical and Communication Engineering, University of Chinese Academy of Sciences, Beijing, 100049, China
  3.Photonics Research Labs, ITEAM Research Institute, Universitat Politecnica de Valencia, Camino de Vear s/n, 46022, Valencia, Spain
- Author bio：
  
  Ninghua Zhu (nhzhu@semi.ac.cn)
  Ming Li (ml@semi.ac.cn)
- Funds：
- DOI：10.1038/s41377-018-0035-8
  中图分类号：
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Yanzhong Liu, Tengfei Hao, Wei Li, 等. Observation of parity-time symmetry in microwave photonics[J]. 光：科学与应用, 2018,7(5):379-387.

Liu, Y. Z. et al. Observation of parity-time symmetry in microwave photonics. Light: Science & Applications, 7, 379-387 (2018).
Yanzhong Liu, Tengfei Hao, Wei Li, 等. Observation of parity-time symmetry in microwave photonics[J]. 光：科学与应用, 2018,7(5):379-387. DOI： 10.1038/s41377-018-0035-8.

Liu, Y. Z. et al. Observation of parity-time symmetry in microwave photonics. Light: Science & Applications, 7, 379-387 (2018). DOI： 10.1038/s41377-018-0035-8.

摘要

Abstract

Symmetry plays a crucial role in explorations of the laws of nature. Parity-time (PT) symmetry phenomena can lead to entirely real spectra in non-Hermitian systems, which attracts considerable attention in the fields of optics and electronics because these phenomena provide a new tool for the manipulation of oscillation modes and non-reciprocal signal transmission. A potential new field of application is microwave photonics, an interdisciplinary field in which the interaction between microwaves and optical signals is exploited. In this article, we report the experimental use of PT symmetry in an optoelectronic oscillator (OEO), a key microwave photonics system that can generate single-frequency sinusoidal signals with high spectral purity. PT symmetry is theoretically analyzed and experimentally observed in an OEO with two mutually coupled active oscillation cavities via a precise manipulation of the interplay between gain and loss in the two oscillation cavities. Stable single-frequency microwave oscillation is achieved without using any optical/electrical filters for oscillation mode selection, which is an indispensable requirement in traditional OEOs. This observation opens new avenues for signal generation and processing based on the PT symmetry principle in microwave photonics.

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references

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