基于光纤布拉格光栅对的双波长线形腔掺铒光纤激光器设计与优化  

Design and Optimization of Dual-Wavelength Linear Cavity Erbium-Doped Fiber Laser Based on Double Fiber Bragg Gratings

作　　者：张振鹤 刘丰年 果鑫 陈涛 韩林桀 Zhang Zhenhe;Liu Fengnian;Guo Xin;Chen Tao;Han Linjie(College of Computer Science,Hunan University of Technology,Zhuzhou 412007,Hunan,China)

机构地区：[1]湖南工业大学计算机学院,湖南株洲412007

出　　处：《光学学报》2023年第23期62-71,共10页Acta Optica Sinica

基　　金：湖南省自然科学基金(省市联合)(2022JJ50067,2021JJ50049);湖南省教育厅科学研究一般项目(21C0405)。

摘　　要：基于光纤布拉格光栅对(DFBGs)的双波长线形腔光纤激光器利用偏振烧孔效应实现双波长激光稳定输出的研究颇多,但有关3 dB光纤环形镜(FLM)与光纤布拉格光栅(FBG)构成腔镜或仅FBG构成腔镜,以及DFBGs的选择对其激光输出性能[光信噪比(OSNR)、斜率效率及稳定性等]的影响的研究很少。本文实验首先在双波长线形腔掺铒光纤激光器中比较了3 dB FLM与FBG构成腔镜和仅FBG构成腔镜的双波长激光的输出性能,结果表明,仅FBG构成腔镜的输出性能优于3 dB FLM与FBG构成腔镜的输出。其次在仅FBG构成腔镜的线形腔中对低反射率FBG(输出镜)反射率相同与不同时的输出性能进行了对比,研究表明,低反射率FBG的反射率相同时双波长激光输出具有较高的OSNR、斜率效率和稳定性。接着改变构成腔镜的两对FBG的中心波长间隔分别为4、8、12 nm,研究表明,中心波长间隔越大输出越稳定,OSNR越高,但激光器的斜率效率有所降低。最后在室温环境下实现了两个激光波长分别为1550 nm和1562 nm、OSNR分别为50.24 dB和51.19 dB左右、中心波长变化分别小于0.030 nm和0.035 nm、输出功率波动分别小于0.061 mW和0.059 mW、3 dB带宽分别为~0.146 nm和~0.144 nm的稳定输出,该结果为线形腔双波长的更优输出。Objective Traditional single-wavelength fiber lasers make it challenging to meet the increasing capacity demands for modern optical fiber communication systems.Employing multiple single-wavelength fiber lasers as light sources by wavelength division multiplexing technology is bound to increase system complexity and costs.Additionally,there are potential applications in multi-dimensional information fiber sensing for multi-wavelength fiber lasers.Therefore,multi-wavelength fiber lasers with stable performance have been widely studied and can be adopted to expand communication systems and meet the needs of multi-dimensional information fiber sensing.However,the problems for stable operation of multi-wavelength erbium-doped fiber laser(EDFL)are as follows.At room temperature,due to the homogeneous broadening of erbium-doped fiber,it is easy to cause mode competition,which reduces the stability of multi-wavelength fiber lasers with narrow wavelength intervals.Based on the dual-wavelength linear cavity EDFL,we select a simple linear cavity fiber laser structure,optimize the reflectivity and center wavelength of fiber Bragg grating(FBG),and realize a stable dual-wavelength laser output by the polarization hole burning(PHB)effect.Compared with the existing PHB schemes,the laser features a simple and compact structure,low cost,and good stability.We hope that our study will help realize dual-wavelength linear cavity fiber lasers with excellent performance at room temperature.Methods We study the influence of the structure of dual-wavelength linear cavity EDFL and FBG parameters(reflectivity and center wavelength)on the output performance of a dual-wavelength laser.Firstly,the output power and dual-wavelength laser spectra of 3 dB fiber loop mirror(FLM)and high reflectivity-FBG(HR-FBG)as the total reflector respectively,and low reflectivity-FBG(LR-FBG)as the output mirror are compared.Secondly,based on the double fiber Bragg gratings (DFBGs) as a cavity mirror, two HR-FBGs with the same reflectivity are adopted as the tota

关 键 词：光纤布拉格光栅对 偏振烧孔 3 dB光纤环形镜 双波长线形腔掺铒光纤激光器 中心波长间隔 

分 类 号：TN242[电子电信—物理电子学]