光学学报, 2017, 37 (3): 0306001, 网络出版: 2017-03-08   

基于多芯光纤的三模复用/解复用器的设计

Design of Multi-Core Fiber Based Three-Mode Multiplexer/Demultiplexer
作者单位
北京科技大学计算机与通信工程学院, 北京 100083
摘要
根据模式耦合理论, 设计了一种基于三芯光纤并支持LP01、LP11a、LP11b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LP11a模与LP01模、LP11b模与LP01模的功率转换过程, 确定最优的光纤长度为5.2 mm。在C+L波段中所设计的三模复用/解复用器能提供50 nm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。
Abstract
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 three-mode 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.

涂佳静, 张欢, 李晗, 隆克平. 基于多芯光纤的三模复用/解复用器的设计[J]. 光学学报, 2017, 37(3): 0306001. Tu Jiajing, Zhang Huan, Li Han, Long Keping. Design of Multi-Core Fiber Based Three-Mode Multiplexer/Demultiplexer[J]. Acta Optica Sinica, 2017, 37(3): 0306001.

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