摘要
根据模式耦合理论,设计了一种基于三芯光纤并支持LP_(01)、LP_(11a)、LP_(11b)三种空间模式传输的三模复用/解复用器。该三芯光纤由一个位于中央的三模纤芯和两个外部的单模纤芯构成。选择三模纤芯的结构参数,根据模式有效折射率匹配原理分别设计两个外部单模纤芯的参数。通过仿真分析了LP_(11a)模与LP_(01)模、LP_(11b)模与LP_(01)模的功率转换过程,确定最优的光纤长度为5.2mm。在C+L波段中所设计的三模复用/解复用器能提供50nm的工作带宽,其模式转换效率达到90%。该基于三芯光纤的三模复用/解复用器具有结构简单、模式转换效率高、插入损耗小、带宽宽等优点。
According to the coupled mode theory,a three-core fiber based three-mode multiplexer/demultiplexer supporting to transmit three spatial modes（LP01,LP11a,LP11b）is designed.This three-core fiber consists of a threemode core located in the center and two single-mode cores deployed in the outer layer.The structural parameters of the three-mode core are chosen,and then according to the effective refractive index matching principle of mode,parameters of two single-mode cores in the outer layer are designed.The power conversion processes between LP11a mode and LP01 mode,as well as LP11b mode and LP01 mode,are analyzed by simulation,respectively.The optimal fiber length obtained is 5.2 mm.Finally,in C＋L band,the working bandwidth provided by the three-mode multiplexer/demultiplexer is 50 nm for mode conversion efficiency of 90%.This three-core fiber based three-mode multiplexer/demultiplexer has plenty of advantages,such as simple structure,high mode conversion efficiency,small splice loss,and wide band.
出处
《光学学报》
EI
CAS
CSCD
北大核心
2017年第3期155-162,共8页
Acta Optica Sinica
基金
国家自然科学基金(61501027)
中国博士后科学基金(2015M570934)
中央高校基本科研业务费专项资金(FRF-TP-15-031A1)
