基于五芯光子晶体光纤的超大带宽低损耗新型模分复用器/解复用器  

Novel Mode-Division Multiplexer/Demultiplexer with Ultra-Large Bandwidth and Ultra-Low Insertion Loss Based on Five-Core Photonic Crystal Fiber

作　　者：惠战强 李泽林 韩冬冬 李田甜 Hui Zhanqiang;Li Zelin;Han Dongdong;Li Tiantian(School of Electronic Engineering,Xi’an University of Posts and Telecommunications,Xi’an 710121,Shaanxi,China;Xi’an Key Laboratory of Microwave Photonics and Optical Communication,Xi’an University of Posts and Telecommunications,Xi’an 710121,Shaanxi,China)

机构地区：[1]西安邮电大学电子工程学院,陕西西安710121 [2]西安市微波光子与光通信技术重点实验室,陕西西安710121

出　　处：《光学学报》2024年第16期47-58,共12页Acta Optica Sinica

基　　金：陕西省重点研发计划项目(2022GY-008);陕西省创新能力支撑计划项目(2022PT15);陕西省教育厅协同创新项目(20JY060)。

摘　　要：提出了一种基于五芯光子晶体光纤的新型模分复用器/解复用器(MUX/DMUX)。采用本征模有限差分法和本征模展开法对MUX/DMUX的结构参数进行了优化。数值模拟结果表明,该器件能够以超低的插入损耗(IL)在主芯中同时复用/解复用LP_(01)、LP_(11)、LP_(21)、LP_(31)和LP_(12)5种模式。当输入光中心波长为1.55μm时,器件的模式转换效率大于96.7%,IL小于0.15 dB。所提出的MUX/DMUX结构紧凑,长度仅为1.84 mm。此外,该器件可以在620 nm(1.33~1.95μm,覆盖E、S、C、L、U波段)的超宽带内以小于-11.34 dB的串扰高效工作,在未来的模分复用系统中具有巨大应用潜力。Objective Multicore photonic crystal fibers(PCFs)have attracted considerable attention.The cladding and core of PCFs typically contain air holes of different sizes and pitches that run the entire length of the fiber,allowing light waves to be confined to the core area.By adjusting the structure,size,and arrangement of these air holes,PCFs can achieve unique light-guiding characteristics that traditional fibers cannot,such as a large mode field area,high nonlinearity,endless single mode,high birefringence,and tailored dispersion.Compared with other types of MUX/DMUXs,PCF-based MUX/DMUXs generally offer a large number of mode multiplexes,a wide operating bandwidth,and low insertion loss.They can be easily integrated into existing optical-fiber communication systems and utilized in various engineering applications.Additionally,with the development of the mobile Internet across different vertical application fields,there is a need to further enhance the transmission rate of optical-fiber communication systems in backbone networks.With the emergence of MDM systems,the communication capacity of a single fiber has greatly improved.As a key component of the MDM system,the PCF-based MUX/DMUX has an inherent advantage in compatibility with existing single-mode optical-fiber systems.However,to date,PCF-based MUX/DMUX systems with satisfactory performance have been rarely reported.Therefore,developing a PCF-based MUX/DMUX with ultra-low insertion loss,ultra-wide bandwidth,and multiple multiplexing modes for ultra-large-capacity,ultra-high-speed,and ultra-long-distance MDM systems is highly desirable.Methods First,we design a five-core PCF-based structure MUX/DMUX.We then conduct numerical analysis on the main kernel of the proposed five-core PCF-type MUX/DMUX using the eigenmode finite difference(FDE)method,verifying that the main kernel can simultaneously transmit five modes without crosstalk.Next,using the control variable method,we study the fundamental mode characteristics in the side core by optimizing the radius of the

关 键 词：模分复用器/解复用器 多芯光子晶体光纤 模式耦合效率 插入损耗 

分 类 号：TN29[电子电信—物理电子学]