低串扰大模场四芯五模微结构光纤的理论研究  

Theoretical Study of Four-Core Five-Mode Microstructured Optical Fiber with Low Crosstalk and Large Mode Field Area

作　　者：梁永泽 梁恩旺 张函 汪国瑞 张继伟 闫欣 王方 张学楠 程同蕾 Liang Yongze;Liang Enwang;Zhang Han;Wang Guorui;Zhang Jiwei;Yan Xin;Wang Fang;Zhang Xuenan;Cheng Tonglei(State Key Laboratory of Process Industry Integrated Automation,College of Information Science and Engineering,Northeast University,Shenyang,Liaoning 110004,China)

机构地区：[1]东北大学信息科学与工程学院流程工业综合自动化国家重点实验室,辽宁沈阳110004

出　　处：《中国激光》2021年第19期116-125,共10页Chinese Journal of Lasers

基　　金：国家自然科学基金(61775032);国家重点研发计划(2019YFB2204001);教育部基本科研业务费(N2104022,N180406002,N180408018,N2004021);111引智基地(B16009)。

摘　　要：为满足空分复用和模分复用系统对大容量、多通道通信光纤的需求,提出了一种新型的沟槽-"十字形"空气孔辅助型多芯少模微结构光纤。利用有限元法(FEM)计算并优化光纤结构参数。结果表明:在工作波长1550 nm处,该光纤实现了LP_(01)、LP_(11)、LP_(21)、LP_(02)、LP_(31)5-LP模式的稳定传输,有效模场面积分别为113.14、159.70、174.43、104.91、192.74μm^(2),且在传输距离为10 km的情况下,芯间串扰均小于-40 dB,相对纤芯复用因子为62.722。与已报道的多芯少模光纤相比,该光纤具有低串扰和大模场面积的优点,可满足未来大容量、多通道传输系统的需求。Objective This paper proposes a novel trench and crosses airhole-assisted multicore few-mode microstructured optical fiber(TCAH-MC-FM-MOF)to meet the demand for space-division multiplexing system and mode-division multiplexing system for large-capacity,multichannel communication fibers,the structural parameters of which are optimized using the finite element method(FEM).After optimization,the designed fiber can support the stable transmission of LP_(01),LP_(11),LP_(21),LP_(02)and LP_(31)5-LPmodes at the operating wavelength of 1550nm,and the effective mode fields are 113.14,159.70,174.43,104.91and 192.74μm^(2),respectively.The intercore crosstalk of these five modes is less than-40dB,and the relative core multiplexing factor is 62.722.Compared with its existing counterparts,this fiber has lower crosstalk and a larger mode effective field area.It is expected to meet the needs of large-capacity and multichannel transmission of the communication systems.Methods This paper proposes TCAH-MC-FM-MOF as a good candidate for large-capacity,multichannel communication fibers.The cross-section and refractive index profile are shown in Fig.1.The FEM optimizes the fiber structure to achieve the best performance based on the mode and power coupling theory.The intercore crosstalk formula of the four-core optical fiber is derived via theoretical analysis for a more accurate crosstalk calculation.The relationship between multiple structural parameters and fiber performance is exploited to achieve low intercore crosstalk and large field area.The initial fiber parameters are continuously optimized,and a set of satisfactory structural parameters is listed in Table 2.To demonstrate the advantages of TCAH-MC-FM-MOF designed in this paper,the performance of four types of multicore and few-mode fibers with different structures is compared by evaluating the intercore crosstalk LP31at the transmission distance of 100km at 1550nm.The results demonstrate that TACH-FM-MCF-MOF has the lowest crosstalk value and the best performance,as shown i

关 键 词：光纤光学 微结构光纤 多芯光纤 少模光纤 模场面积 芯间串扰 

分 类 号：TN913.7[电子电信—通信与信息系统]