同心圆形应力区辅助的熊猫型保偏少模光纤  

Concentric-Circular Stress-Applying Region-Assisted Panda Polarization-Maintaining Few-Mode Fiber

作　　者：刘亚男 颜鑫[1] 袁学光[1] 张阳安[1] 张霞[1] Liu Yanan;Yan Xin;Yuan Xueguang;Zhang Yang′an;Zhang Xia(State Key Laboratory of Information Photonics and Optical Communications,Beijing University of Posts and Telecommunications,Beijing 100876,China)

机构地区：[1]北京邮电大学信息光子学与光通信国家重点实验室,北京100876

出　　处：《光学学报》2023年第20期39-46,共8页Acta Optica Sinica

基　　金：国家自然科学基金(61935003);北京邮电大学信息光子学与光通信国家重点实验室自主研究课题(IPOC2022ZZ01,IPOC2022ZT02,IPOC2020ZZ01)。

摘　　要：提出一种具有同心圆形应力区的熊猫型保偏少模光纤结构,该结构可以稳定支持10个传输模式。通过引入低折射率应力区,高阶模式之间的有效折射率差提升了近一个数量级,相邻模式之间的最小有效折射率差在1550 nm处达到2×10^(-4),在C波段不低于1.8×10^(-4)。模式色散不高于|-55.0219|ps/(nm·km),最大弯曲损耗在10^(-7)d B/m量级(弯曲半径≥9.5 cm)。该研究成果为短距离大容量的光纤设计提供了思路。Objective The emergence of new data services and the rapid development of cloud computing have put forward urgent demands for improving transmission capacity in optical interconnection networks.The capacity of traditional single-mode fibers is difficult to enhance due to the nonlinear Shannon limit.Space division multiplexing(SDM)technology has caught extensive attention for its ability to reach maximum capacity.Few-mode fibers are a typical design using SDM,and the mode crosstalk that occurs during the few-mode fiber transmission is a major problem.The multiple-input multiple-output(MIMO)digital signal processing technology is usually introduced at the receiver to solve this problem.However,as the number of guided modes increases,the system complexity will grow nonlinearly,resulting in significant power consumption.Therefore,the communication system should be simplified by suppressing the mode coupling from the root,which is separating the adjacent eigenmodes to the maximum extent.The polarization-maintaining few-mode fibers with special structures can improve the capacity and ensure a higher mode separation degree.However,the previous fiber designs ignore the contradiction between the lower-order mode separation and the higher-order mode separation.Thus,we take this as a breakthrough point to introduce concentric-circular stress-applying region,improving this contradiction relationship and increasing the effective refractive index difference between adjacent modes.Meanwhile,the polarization characteristics,mode effective area,wavelength dependence,mode dispersion,bending resistance,and other indicators are considered to yield better transmission performance and reliability.Methods To adapt to the development of optical interconnection networks with short-distance and large-capacity transmission,we propose a concentric-circular stress-applying region-assisted panda polarization-maintaining few-mode fiber.The prominent feature of this fiber is that this concentric-circular region is set around the elliptical-ring

关 键 词：光纤光学 少模光纤 空分复用 保偏 简并模 

分 类 号：TN29[电子电信—物理电子学]