多芯超模光纤放大器增益均衡设计(内封底文章)  

Design of gain equalization for multi-core supermode fiber amplifier(inside back cover paper)

作　　者：朱福喜 裴丽[1] 王建帅[1] 徐文轩 郑晶晶[1] 李晶[1] 宁提纲[1] Zhu Fuxi;Pei Li;Wang Jianshuai;Xu Wenxuan;Zheng Jingjing;Li jing;Ning Tigang(School of Electronic Information Engineering,Beijing Jiaotong University,Beijing 100044,China)

机构地区：[1]北京交通大学电子信息工程学院,北京100044

出　　处：《红外与激光工程》2024年第1期193-201,共9页Infrared and Laser Engineering

基　　金：国家自然科学基金项目(62235003,62221001)。

摘　　要：多芯超模光纤(MCSMF)的芯间距较小,多个芯子共同形成芯区支持多个超模传输,与普通单芯少模光纤相比,其具有较大的有效模场面积和较小的模式串扰,备受关注。MCSMF用于长距离传输时,与其相匹配的新型增益均衡放大器是实现信号中继并保持信号稳定传输的必要器件。文中提出了一种基于粒子群优化算法的19芯超模光纤增益均衡放大器,该光纤支持10个超模共同传输。通过粒子群算法分别优化各纤芯内掺铒浓度来降低不同超模的交叠积分因子,从而减小模式增益差(DMG)。结果表明,在包层泵浦条件下,最大DMG从1.33 dB (各纤芯均匀掺杂)降低至0.20 dB,在1 550 nm信号波长处10模式的平均增益为27.79 dB,且该放大器在整个C波段的增益平坦度低于1 dB。Objective Multi-core supermode fiber(MCSMF)with small inter-core spacing enable multiple cores to form a core region that supports the transmission of multiple supermodes.In comparison to conventional single-core few modes fiber,MCSMF has a larger effective mode field area and lower mode crosstalk,making it highly attractive When used for long-distance transmission,novel gain equalization amplifier that is compatible with MCSMF is a necessary device to achieve signal relaying and maintain stable signal transmission.Current research on MCSMF mainly focuses on increasing the number of spatially multiplexed channels,optimizing pumping methods,and adjusting the length of the erbium-doped fiber(EDF)to expand communication capacity and reduce differentia mode gain(DMG).However,there are few reports on the structural design of MCSMF.Therefore,it is of grea significance to optimize the fiber's structural parameters and erbium ion distribution to further reduce DMG.In this study,the particle swarm optimization algorithm was employed to flexibly control the erbium doping concentration in each fiber core,determining the optimal doping structure of the EDF.This approach reduces the overlap integral factors of different supermodes and achieves gain equalization for LP_(01),LP_(11a),LP_(11b),LP_(21a),LP_(21b)LP_(02),LP_(31a),LP_(31b),LP_(12a)andLP_(12b)in the MC-SM-EDFA.Methods The designed MCSMF in this study consists of 19 fiber cores(Fig.1),including a central core(1),the first layer of cores(2-7),and the second layer of cores(8-19).These 19 cores are uniformly distributed in a hexagonal pattern.In the MCSMF,erbium ions are uniformly doped within a single layer of each fiber core.The doping concentration(volume fraction)in each core is denoted as N_(1),N_(2),···N_(19)according to the core numbering.The particle swarm optimization algorithm is utilized to optimize the erbium doping concentration in each fiber core,aiming to reduce the overlap integral factors of different supermodes and further minimize DMG.This optimizat

关 键 词：光通信 多芯超模光纤放大器 粒子群优化算法 增益均衡 

分 类 号：TN929.11[电子电信—通信与信息系统]