一种沟槽辅助气孔隔离的低串扰高密度异质多芯少模光纤  

A low-crosstalk and high-density multi-core few-mode fiber based on heterogeneous core and trench-assisted air-holes isolation

作　　者：王彦 韩颖[1] 李增辉 龚琳 王璐瑶 李曙光[2] Wang Yan;Han Ying;Li Zeng-Hui;Gong Lin;Wang Lu-Yao;Li Shu-Guang(The Key Laboratory for Special Fiber and Fiber Sensor of Hebei Provence,School of Information Science and Engineering(School of Softwave),Yanshan University,Qinhuangdao 066004,China;Key Laboratory for Microstructural Material Physics of Hebei Province,State Key Laboratory of Metastable Materials Science&Technology,School of Science,Yanshan University,Qinhuangdao 066004,China)

机构地区：[1]燕山大学信息科学与工程学院(软件学院)河北省特种光纤与光纤传感重点实验室,秦皇岛066004 [2]燕山大学理学院亚稳材料制备技术与科学国家重点实验室河北省微结构材料物理重点实验室,秦皇岛066004

出　　处：《物理学报》2022年第2期107-114,共8页Acta Physica Sinica

基　　金：国家重点研发计划(批准号:2019YFB2204001);河北省自然科学基金(批准号:F2019203549,F2019105108)资助的课题。

摘　　要：以单模光纤为基础的传统光通信系统的容量已趋近其理论极限,多芯少模光纤是突破现有传输容量瓶颈的一种有效方式.本文设计了一种低串扰5-LP模的弱耦合异质芯7芯光纤,采用沟槽辅助和气孔隔离相结合的方法,在标准125μm外径的情况下实现了芯间和模间的低串扰.利用有限元法计算了纤芯之间的串扰、有效模面积等.经过设计优化,光纤在光通信C+L波段可以稳定传输5个LP模式,其中LP_(21)与LP_(02)模之间的有效折射率差最小,且大于1.1×10^(–3);光纤中LP_(31)模式的芯间串扰最大且低于–50 dB/km,因此该光纤可以同时实现模间和芯间的低串扰传输.7个纤芯中5个LP模的有效模面积均大于86μm^(2),在波长1550 nm处相对纤芯复用因子为57.63,该光纤可用于大容量高速光纤传输系统.The capacity of a traditional optical communication system based on single-mode fiber has approached to its theoretical limit.Multi-core few-mode fibers provide an effective way to break through the bottleneck of existing transmission capacity.In this paper,a 5-LP-mode weakly-coupled low-crosstalk 7-core fiber is designed by using a combination of trench assistance and air hole isolation structure.The fiber with a standard outer diameter achieves low crosstalk between cores and modes.The inter-core crosstalk area and the effective mode area of the core are calculated by the finite element method.After design optimization,there are 5 stable transmission LP modes in the C+L band of optical communication in this fiber.The effective refractive index difference between LP_(21)mode and LP_(02)mode is the smallest and is greater than 1.1×10^(–3).The LP_(31)mode in the optical fiber has the largest inter-core crosstalk and the loss is lower than–50 dB/km.The fiber can achieve low crosstalk transmission between modes and cores at the same time.The mode areas of the 5 LP modes in the 7 cores are larger than 86μm^(2),and the relative core multiplexing factor is 57.63 at a wavelength of 1550 nm.Therefore,this fiber can be used in a large-capacity high-speed fiber transmission system.

关 键 词：多芯少模光纤 异质纤芯 C+L波段 低串扰 

分 类 号：TN253[电子电信—物理电子学]