基于空分复用光纤通信系统模式转换器的研究  

Mode Converter of Optical Fiber Communication System Based on Space Division Multiplexing

作　　者：钟文博 董昭达 张玲 张克非[2] 王娅欣 Zhong Wenbo;Dong Zhaoda;Zhang Ling;Zhang Kefei;Wang Yaxin(Faculty of Science,Southwest University of Science and Technology,Mianyang,Sichuan 621010,China;School of Computer Science and Technology,Southwest University of Science and Technology,Mianyang,Sichuan 621010,China;School of Information and Communication Engineering,University of Electronic Science and Technology of China,Chengdu,Sichuan 611731,China)

机构地区：[1]西南科技大学理学院,四川绵阳621010 [2]西南科技大学计算机科学与技术学院,四川绵阳621010 [3]电子科技大学信息与通信工程学院,四川成都611731

出　　处：《激光与光电子学进展》2021年第11期99-107,共9页Laser & Optoelectronics Progress

基　　金：四川省大学生创新创业训练基金资助项目(S202010619067);西南科技大学校级重点教育教学改革与研究项目(19xnzd21);西南科技大学素质类教改专项(19szjg03);西南科技大学大学生创新基金项目(CX20-029);西南科技大学理学院人才培养暨学科竞赛创新基金项目(LX2020020);四川省高等教育人才培养质量和教学改革基金资助项目(19sjjg21)。

摘　　要：为改善光纤通信系统带宽容量在实际工程应用中面临的局限性,基于空分复用技术提出一种可分别传输基模与高阶模的光子晶体光纤纤芯结构,利用虚轴光束传播法得到不同结构参数下相应模式的有效折射率曲线,通过匹配两种模式的有效折射率曲线,设计了一种具有非对称双芯结构的光子晶体光纤模式转换器。光波长为1550 nm时,该器件实现了基模(LP01模)与高阶模(LP02模)之间的模式转换,在较宽的归一化频率范围内模式耦合效率可达91.98%,耦合长度约178.5μm,器件直径最大仅47.6μm。该结构设计灵活可控,可满足未来大容量通信系统的需求。To improve limitations of bandwidth capacity of optical fiber communication system in practical engineering applications, a photonic crystal fiber core structure which is capable of transmitting fundamental and high-order modes is proposed based on space division multiplexing technology. The effective refractive index curves of the corresponding modes under different structural parameters are obtained using the finite-difference imaginarydistance beam propagation method. An asymmetric dual-core photonic crystal fiber mode converter is designed by matching the effective refractive index curves of the two modes. It demonstrates that such an LP01-to-LP02 mode converter can be achieved at the wavelength of 1550 nm. In a wider frequency range, the mode coupling efficiency is above 90%, and the coupling length is about 178. 5 μm. The device diameter is 47. 6 μm, and the structural design is flexible and controllable, which can meet the needs of future large-capacity communication systems.

关 键 词：光通信 光子晶体光纤 空分复用 模式转换器 虚轴光束传播法 

分 类 号：TN253[电子电信—物理电子学]