Open AccessParity-time symmetric tunable OEO based on dual-wavelength and cascaded PS-FBGs in a single-loop
Author(s) -
Pengcheng Liu,
Zhanwu Xie,
Dongdong Lin,
Mengjia Lu,
Wei Cheng,
Guohua Hu,
Binfeng Yun,
Yiping Cui
Publication year - 2021
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.441780
Subject(s) - phase noise , optics , resonator , bandwidth (computing) , fiber bragg grating , materials science , single mode optical fiber , offset (computer science) , wavelength , dbc , optoelectronics , physics , optical fiber , telecommunications , computer science , programming language
The ability to achieve low phase noise single-mode oscillation within an optoelectronic oscillator (OEO) is of fundamental importance. In the frequency-tunable OEO, the wide microwave photonic filter (MPF) bandwidth is detrimental to select single-mode among the large number of cavity modes, thus leading to low signal quality and spectral purity. Stable single-mode oscillation can be achieved in a large time delay OEO system by harnessing the mechanism from parity-time (PT) symmetry. Here, a PT-symmetric tunable OEO based on dual-wavelength and cascaded phase-shifted fiber gratings (PS-FBGs) in a single-loop is proposed and experimentally demonstrated. Combining the merits of wide frequency tuning of PS-FBG-based MPF and single mode selection completed by the PT-symmetric architecture of the OEO, where the gain and loss modes carried by dual-wavelengths to form two mutually coupled resonators in a single-loop, signals range from 1 GHz to 22 GHz with the low phase noise distributed in -122∼ -130 dBc/Hz at 10 kHz offset frequency are obtained in the experiment.