基于小信号放大的掺铒光纤放大器的仿真与实验  

Simulation and experiment of erbium-doped fiber amplifier based on small signal amplification

作　　者：梅博 赵晓龙 眭晓林 刘波 吴姿妍 MEI Bo;ZHAO Xiao-long;SUI Xiao-lin;LIU Bo;WU Zi-yan(Key Laboratory of Solid State Laser Technology,Beijing 100015,China)

机构地区：[1]固体激光技术重点实验室,北京100015

出　　处：《激光与红外》2023年第2期231-236,共6页Laser & Infrared

摘　　要：本文研究并设计了一种掺铒光纤放大器,该EDFA能够有效对微弱光信号功率进行放大。首先在OptiSystem环境下进行理论数值仿真优化,根据仿真优化结果对现有光路进行改进。为对比两种掺杂浓度光纤的增益特性,本文进行低掺光纤和高掺光纤仿真与实验,发现高掺光纤优势较大,选用高掺光纤增益系数可达34.2 dB。相较传统EDFA,选择的高掺光纤长度仅为传统光纤长度的十分之一,并且可以保证增益系数在34 dB以上;其次在缩短光纤长度的条件下对-40 dBm的信号产生较大增益,利用改进的插值法计算测量得到的噪声系数更加精确,较传统放大器低0.3 dB左右,实现较低噪声系数和较高增益。基于以上优点,该放大器已应用于信号光的前置放大系统,对小信号光具有良好的放大效果。In this paper, an erbium-doped fiber amplifier which can effectively amplify the power of weak optical signals is studied and designed.Firstly, the theoretical numerical simulation optimization is carried out in the OptiSystem environment, and the existing optical path is improved according to the simulation optimization results.In order to compare the gain characteristics of the two doping fibers, the simulation and experiment of the low-doped fiber and the high-doped fiber are carried out in this paper.It is found that the high-doped fiber has certain advantages, with a gain coefficient of 34.2 dB for the high-doped fiber.Compared with the traditional EDFA,the length of the selected high-doped fiber is only one tenth of the length of the traditional fiber, and the gain coefficient can be guaranteed to be above 34 dB.The-40 dBm signal has a higher gain with a shorter fiber length and the noise figure is more accurate than conventional amplifier by using an improved interpolation method to calculate the measurement, which is about 0.3 dB lower than traditional amplifier, achieving a lower noise figure and higher gain.Based on the above advantages, the amplifier has been applied to the pre-amplification system of signal light, and has a good amplifying effect on small signal light.

关 键 词：掺铒光纤 掺杂长度 插值法 噪声系数 OPTISYSTEM 

分 类 号：TN248[电子电信—物理电子学]