In recent years, parity-time (PT) symmetry in optoelectronic systems has been widely studied, due to its potential applications in lasers, sensors, topological networks, and other fields. In this paper, a time-division multiplexed pulsed optoelectronic oscillator (OEO) is proposed to study the dynamics of a PT symmetry system. Two microwave pulses are used to realize the PT symmetry in a single spatial resonator based on the temporal degrees of freedom. The gain and loss of the microwave pulses and the coupling coefficient between them can then be controlled. We first demonstrate the phase diagram from PT broken to PT symmetry in the OEO system. We theoretically prove that the perturbation of a coupling-induced phase shift larger than (2π)×10-2 causes the disappearance of the PT symmetry. In this experiment, the perturbation is less than (2π)×0.5×10-2; thus, the phase transition of PT symmetry is observed. In addition, multipairs of PT-symmetry pulses indicate that pulsed OEO could be used to implement complex non-Hermitian Hamilton systems. Therefore, it is confirmed that pulsed OEO is an excellent platform to explore the dynamics of PT symmetry and other non-Hermitian Hamiltonian systems.

Hao Ding;Qizhuang Cen;Kun Xu;Ming Li;Yitang Dai

State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications, Beijing 100876, China;State Key Laboratory on Integrated Optoelectronics, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China;School of Electronic, Electrical and Communication Engineering, University of Chinese Academy of Sciences, Beijing 100049, China;Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100190, China;Peng Cheng Laboratory, Shenzhen 518052, China;e-mail: ml@semi.ac.cn

光子学研究（英文）

[1]Hao Ding;Qizhuang Cen;Kun Xu;Ming Li;Yitang Dai-.Observation of parity-time symmetry in time-division multiplexing pulsed optoelectronic oscillators within a single resonator)[J].光子学研究（英文）,2022(08):1915

multipairs

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