摘要
提出了一种基于环形芯结构的掺铒涡旋光纤。针对该涡旋光纤的放大性能,分析了其高折射率环和掺杂区域宽度对增益性能的影响。仿真结果表明,该光纤可支持1~2阶涡旋光模式,且C波段内的模式增益均高于35.4 dB。通过搭建实验装置对环形芯掺铒涡旋光纤的放大性能进行了测试。实验结果表明,在1530 nm波长处涡旋光的模式增益最大值高达32.6 dB。此环形芯掺铒涡旋光纤可广泛应用在长距离、大容量的空分复用光纤通信等领域中。
Objective Currently,the information capacity of communication systems based on a single-mode fiber(SMF)is approaching its physical limits.To solve this problem,spatial division multiplexing based on orbital angular momentum(OAM)has been intensively investigated.Theoretically,owing to their orthogonality characteristics,OAM modes can help realize infinite multiplexed channels.Hence,the capacity and spectrum efficiency of existing optical fiber communication can be enhanced by using the orthogonality and infinity properties of the OAM modes.The vortex mode amplifier is one of the key devices in optical communication systems and is essential for improving the performance of future vortex mode multiplexing systems applicable in long-distance and high-capacity optical fiber communication.Currently,the vortex mode amplifier heavily relies on the ring-core erbium-doped fiber(RC-EDF),which is not only conducive to the stable transmission of the vortex beam but also improves the conversion efficiency of the pump beam.The modal gain is an important index of ring-core erbium-doped vortex fiber amplifiers.Therefore,the design and fabrication of an RC-EDF with a high modal gain are essential to satisfy the growing demand for data traffic.Methods The modal gain mainly depends on the intensity distribution of the pump and signal modes as well as the doping distribution of erbium ions.The ring core structure is used to optimize the field distribution of the pump modes,thereby improving the conversion efficiency of the pump beam.Owing to the limitations of the doping technology,the doping distribution of erbium ions in actual fabricated fibers differs considerably from that of the theoretical design.Therefore,in this study,we simplify the Er doping factor in the theoretical design to ensure that the doping distribution of the erbium ions is uniform.First,the effects of the doping region and width of the ring core on the gains of the first-and second-order vortex modes are analyzed,and subsequently,these effects are optimized to r
作者
刘帅帅
张亮
魏鹤鸣
文建湘
庞拂飞
王廷云
Liu Shuaishuai;Zhang Liang;Wei Heming;Wen Jianxiang;Pang Fufei;Wang Tingyun(Key Laboratory of Specialty Fiber Optics and Optical Access Networks,School of Communication and Information Engineering,Shanghai University,Shanghai 200444,China)
出处
《中国激光》
EI
CAS
CSCD
北大核心
2023年第10期132-138,共7页
Chinese Journal of Lasers
基金
国家重点研发计划(2018YFB1801800)
国家自然科学基金(61635006,61975113)。
