Realizing Parity-Time Symmetry in a Single-Physical-Loop Optoelectronic Oscillator
- Resource Type
- Conference
- Authors
- Qiao, Yu; Zhang, Yu; Chan, Erwin H. W.; Wang, Xudong; Guan, Bai-Ou; Feng, Xinhuan; Yao, Jianping
- Source
- 2022 IEEE 14th International Conference on Advanced Infocomm Technology (ICAIT) Advanced Infocomm Technology (ICAIT), 2022 IEEE 14th International Conference on. :256-259 Jul, 2022
- Subject
- Communication, Networking and Broadcast Technologies
Photonics and Electrooptics
Optical losses
Phase noise
Time-frequency analysis
Microwave technology
Microwave integrated circuits
Amplitude modulation
Photodetectors
parity-time-symmetric
optoelectronic oscillator
single physical loop
higher order sidebands
- Language
- ISSN
- 2770-1603
An Optoelectronic Oscillator (OEO) for single frequency oscillation enabled by broken parity time (PT) symmetry is presented. The PT symmetry is realized based on two equivalent loops with the gain loop formed by the beating of the optical carrier with the ±1st order sidebands and the loss loop formed by the beating of the ±1st order sidebands with the ±2 nd order sidebands at a photodetector in a single-physical-loop OEO. Once the gain and loss coefficients in the system are made identical in magnitude and are greater than the coupling coefficient, PT symmetry is broken and a single frequency oscillation is achieved. Experimental results show that a microwave signal at 9.997 GHz with a high sidemode suppression ratio of 45 dB and an ultra-low phase noise of -142 dBc/Hz at a 10kHz offset frequency is generated.