Abstract

To achieve a wideband frequency tunability, a parity-time symmetric optoelectronic oscillator (PT-OEO) based on hybrid phase modulation (PM) and intensity modulation (IM) is proposed and experimentally demonstrated. In the PT-OEO, the hybrid PM and IM is realized with an arbitrary modulation chirp, by adjusting the polarization state of the polarization-modulated optical signal. Thus, a reconfigurable dispersion-induced power fading is formed to implement a tunable coarse oscillation mode selection. Meanwhile, the parity-time (PT) symmetry breaking is introduced to achieve a fine-mode selection. The incorporation of the two kinds of mode selection mechanisms ensures a widely tunable PT-OEO, even in the absence of a high quality-factor (Q-factor) microwave/optical filter. Experimental results indicate a large tunable frequency range from 16 to 30 GHz for the generated signal. The side-mode suppression ratio of the generated signal is about 40 dB, and the phase noise measured at 18.7 GHz is evaluated as −116 dBc/Hz @ 10-kHz offset frequency.

Widely tunable optoelectronic oscillator based on selective parity-time-symmetry breaking

Haitao Tang, Yuan Yu, and Xinliang Zhang
Optica 6(8) 944-950 (2019)

Parity–time-symmetric frequency-tunable optoelectronic oscillator with a single dual-polarization optical loop

Peng Li, Zheng Dai, Zhiqiang Fan, Lianshan Yan, and Jianping Yao
Opt. Lett. 45(11) 3139-3142 (2020)

Parity-time symmetric frequency-tunable optoelectronic oscillator based on a Si₃N₄ microdisk resonator

Pengcheng Liu, Pengfei Zheng, Huimin Yang, Dongdong Lin, Guohua Hu, Binfeng Yun, and Yiping Cui
Appl. Opt. 60(7) 1930-1936 (2021)

Parity-time-symmetric optoelectronic oscillator based on higher-order optical modulation

Yu Qiao, Yu Zhang, Ruiqi Zheng, Erwin H. W. Chan, Xudong Wang, Xinhuan Feng, Bai-Ou Guan, and Jianping Yao
Opt. Lett. 47(17) 4383-4386 (2022)

Single-loop tunable PT-symmetric optoelectronic oscillator based on a phase modulator

Jiahong Zhang, Yao Wang, and Qihong Ding
Appl. Opt. 63(3) 566-574 (2024)