中国光学（中英文）2024，Vol.17Issue(5)：1244-1253,10.DOI:10.37188/CO.EN-2024-0016
基于宇称时间对称与饱和吸收效应的宽可调谐高光信噪比布里渊光纤激光器
Widely-wavelength-tunable brillouin fiber laser with improved optical signal-to-noise ratio based on parity-time symmetric and saturable absorption effect
摘要
Abstract
A widely-wavelength-tunable Brillouin fiber laser(BFL)with improved optical signal-to-noise ra-tio(OSNR)based on parity-time(PT)symmetric and saturable absorption(SA)effect is present.This novel BFL realizes PT symmetry and SA effect through polarization-maintaining erbium-doped fiber(PM-EDF)Sagnac loop,which is composed of a PM-EDF,a coupler and two polarization controllers(PCs).By using the inherent birefringence characteristic of PM-EDF,two feedback loops in orthogonal polarization state are formed when the Strokes signal in injected.One of these loops provides gain in the clockwise direction with in the Sagnac loop,while the other loop generates loss in the counterclockwise direction.By adjusting the PCs to control the polarization state of the PM-EDF,a single-longitudinal-mode(SLM)BFL can be achieved,as the PT symmetry is broken when the SA participating stimulated Brillouin scattering(SBS)gain and loss are well-matched and the gain surpasses the coupling coefficient.Compared to previous BFLs,the proposed BFL has a more streamlined structure and a wider wavelength tunable range,at the same time,it is not being limited by the bandwidth of the erbium-doped fiber amplifier while still maintaining narrow linewidth SLM output.Additionally,thanks to SA effect of the PM-EDF,the PT symmetric SBS gain con-tract is enhanced,resulting in a higher optical signal-to-noise(OSNR).The experimental results show that the laser has a wide tunable range of 1526.088 nm to 1565.498 nm,an improved OSNR of 77 dB,and a fine linewidth as small as 140.5 Hz.关键词
布里渊光纤激光器/波长可调/宇称时间对称/高光信噪比/窄线宽Key words
Brillouin fiber laser/widely-wavelength-tunable/parity-time symmetric/high OSNR/narrow linewidth分类
数理科学引用本文复制引用
刘毅,江恺,房新岳,游亚军,贺文君,侯甲欣,韩学锋,丑修建..基于宇称时间对称与饱和吸收效应的宽可调谐高光信噪比布里渊光纤激光器[J].中国光学（中英文）,2024,17(5):1244-1253,10.基金项目
国家自然科学基金(No.U23A20639,No.U2341210,No.62371426) （No.U23A20639,No.U2341210,No.62371426）
山西省中央引导地方科技发展资金项目(No.YDZJSX2022B005) Supported by the National Natural Science Foundation of China(No.U23A20639,No.U2341210,No.62371426) （No.YDZJSX2022B005）
CentralGuidanceonLocalScienceandTechnologyDevelopmentFundofShanxiProvince(No.YDZJSX2022B005) （No.YDZJSX2022B005）
