少模掺铒光纤放大器的等效掺铒浓度仿真方法研究  

Research on Simulation Method for FM⁃EDFAs by Effective Erbium Doping Concentration

作　　者：许焰 武保剑 江歆睿 郭浩淼 文峰 Xu Yan;Wu Baojian;Jiang Xinrui;Guo Haomiao;Wen Feng(Key Laboratory of Optical Fiber Sensing and Communications,Ministry of Education,School of Information and Communication Engineering,University of Electronic Science and Technology of China,Chengdu 611731,Sichuan,China)

机构地区：[1]电子科技大学信息与通信工程学院光纤传感与通信教育部重点实验室,四川成都611731

出　　处：《中国激光》2023年第5期25-32,共8页Chinese Journal of Lasers

基　　金：国家重点研发计划(2018YFB1801003);国家自然科学基金(62171078)。

摘　　要：提出一种少模掺铒光纤放大器(FMEDFA)仿真方法,通过引入泵浦相关的等效掺铒浓度参数来拟合双向泵浦实验数据,并用VPI软件高效仿真FMEDFA的级联传输性能。采用光隔离波分复用器(IWDM)开展了LP01和LP11两模双向泵浦放大实验,验证了上述仿真方法的可行性。通过优化前后向泵浦功率的比例,设计了一款模式增益约为11 dB的均衡FMEDFA;仿真结果表明,该FMEDFA循环传输10次后的差模增益和光信噪比分别为0.56 dB和27 dB,大于32 GBaud DP32QAM模分复用信号传输系统纠后无误码所要求的光信噪比阈值。Objective Spacedivision multiplexing appears to be the only way to increase the capacity of optical transport networks since wavelengthdivision multiplexing is rapidly approaching its scaling limits.As a key relay device,the fewmode erbiumdoped fiber amplifier(FMEDFA)plays an important role in longdistance mode divisionmultiplexing(MDM)systems.The differential mode gain(DMG)and modal gain are important factors to evaluate the FMEDFA’s performance.The intensity model of FMEDFA can be described by the rate equation of erbium ion concentration and the power evolution equation of the signal(or pump)mode.The distributions of erbium ion doping concentration and signal(or pump)mode field should be known in advance for theoretical calculations,with application to compare with experimental results or to optimize the performance of FMEDFA.For example,the refractive index distribution must be imported into the simulation system as files in many simulation platforms.However,the complicated erbiumdoped concentration distribution and the refractive index profile are usually unknown in most experiments.This research aims to offer a new simulation method to bypass the erbiumdoped concentration distribution and accomplish the consistency of FMEDFA’s theoretical calculation(or simulation results)with the experimental data as possible.Methods According to the relationship between the parameters used in the FMEDFA’s theoretical model shown in Fig.1,an equivalent erbium doping concentration parameter was introduced to replace the real erbium doping concentration N0 in the theoretical model,and then the equivalent erbium doping concentration parameter was obtained by simulating and fitting the mode gain curve measured by the experiment.Regardless of whether the actual N0 is uniform in the erbiumdoped fibers,the gain of the signal modes depends on the pumping mode,pumping mode distribution,and its power;therefore,the equivalent erbium doping concentration also varies with the pumping parameters.Based on the equivalent erbium dopi

关 键 词：光学器件 少模掺铒光纤放大器 双向泵浦 仿真方法 差模增益 

分 类 号：O436[机械工程—光学工程]