可饱和吸收环镜滤波器的环形腔双波长激光器  

Annular cavity dual wavelength laser with saturated absorption ring mirror filter

作　　者：夏志鸿 果鑫 张振鹤 赖榕 陈涛 张威 XIA Zhi-hong;GUO Xin;ZHANG Zhen-he;LAI Rong;CHEN Tao;ZHANG Wei(College of Computer Science,Hunan University of Technology,Zhuzhou 412007,China)

机构地区：[1]湖南工业大学计算机学院,湖南株洲412007

出　　处：《激光与红外》2024年第11期1674-1680,共7页Laser & Infrared

基　　金：湖南省自然科学基金(省市联合)项目(No.2022JJ50067);湖南省学位与研究生教学改革研究项目(No.2022JGYB182);湖南省教育厅科学研究重点项目(No.23A0446);湖南工业大学研究生科研创新项目(No.CX2314)资助。

摘　　要：设计了一种基于可饱和吸收环镜滤波器的环形腔双波长激光器,在3dB光纤环镜中插入未受泵浦的掺铒光纤(EDF)做可饱和吸收体,构成可饱和吸收环镜滤波器,将此滤波器插入环形腔激光器中,通过调节偏振控制器来实现双波长的稳定输出。经过计算选择6.4m的EDF作为增益介质,使用一段2m未泵浦的EDF与2×2的3dB耦合器结合形成可饱和吸收环镜滤波器来抑制超模。为抑制常温下EDF的均匀展宽导致模式竞争,选择1554nm的光纤布拉格光栅(FBG)和1562nm的FBG进行双波长激射,在Optisystem平台上进行仿真并搭建实验来测试输出激光的输出功率斜率效率、光信噪比、稳定性等。实验中得出了在室温下稳定输出的双波长激光,两波长各自的光信噪比为54.7dB和57.5dB;中心波长变化分别小于0.04nm和0.55nm;3dB带宽均为~0.126nm。A saturable dual wavelength laser based on a saturable absorption ring filter is designed.An unpumped erbium doped fiber is inserted into a 3 dB ring mirror to form a saturable absorption ring mirror filter,which is inserted into a ring laser to achieve a stable dual wavelength output by adjusting the polarization controller.After calculation,6.4 m erbium doped fiber is selected as the gain medium,and a section of 2 m unpumped EDF is used to form a saturable absorption loop mirror filter in combination with a 2×23 dB coupler to suppress the supermode.In order to suppress the mode competition caused by the uniform widening of erbium doped fiber at room temperature,1554 nm fiber Bragg grating(FBG)and 1562 nm FBG are selected for dual wavelength lasing.Simulation is conducted on the Optisystem platform and experiments are set up to test the output laser power,signal to noise ratio,stability,etc.The output signal is observed and analyzed with a Optical Spectrum Analyzer.In the experiment,the stable output of dual wavelength laser at room temperature is obtained,and the signal to noise ratio of the two wavelengths is 54.70 dB and 57.50 dB respectively.The 3 dB bandwidth is about 0.13 nm.

关 键 词：环形腔激光器 双波长 可饱和吸收环镜滤波器 偏振控制器 信噪比 

分 类 号：O436[机械工程—光学工程] TN242[理学—光学]