Theory for mode coupling in perturbed fibers

doi:10.1016/j.optcom.2020.125355

	Theory for mode coupling in perturbed fibers
	Zhang, Bin 1; Zhang, Xia 1; Zhang, Xiaoguang 3; Yang, Zhenshan 1; Bai, Chenglin 1; Zhang, Hu 3; Li, Hui 3; Cao, Minghua 2
刊名	Optics Communications
	2020-05-15
卷号	463
关键词	Alignment Energy conversion Fibers Optical fiber coupling Refractive index Eigen modes Energy conversion ratio Large effective Mode coupling Mode-division multiplexing Orbital angular momentum Physical essences Propagation lengths
ISSN号	00304018
DOI	10.1016/j.optcom.2020.125355
英文摘要	Based on a systematic approach to expand non-ideal eigenmodes as superposition of ideal eigenmodes, we develop a theoretical formalism to study mode coupling in perturbed fibers. The formalism explicitly yields the maximum energy-conversion ratios among ideal eigenmodes and the corresponding propagation lengths to reach the maximum conversion, and errors inherent to the underlying perturbative assumption can be estimated straightforwardly. Moreover, the formalism provides a simple way to divide the modes into smaller approximately-decoupled subsets, thus substantially simplifying the theoretical analysis and more directly catching the physical essence. By employing the formalism to analyze a ring fiber under perturbations of ellipticity and misalignment, we find that stability of the ideal eigenmodes is sensitive to the specific perturbation form, i.e., with some modes strongly affected by the ellipticity but not the misalignment, or vice versa. Furthermore, it is revealed that the EH11 and HE31 modes are strongly coupled under perturbation of ellipticity despite the relatively large effective-refractive-index difference, which suggests possible inadequacy of a widely adopted criterion against the coupling of EHν−1,p and HEν+1,p modes. © 2020 Elsevier B.V.
WOS研究方向	Optics
语种	英语
出版者	Elsevier B.V., Netherlands
WOS记录号	WOS:000520479100052
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/115674]
专题	计算机与通信学院
作者单位	1.Shandong Provincial Key Laboratory of Optical Communications Science and Technology, School of Physics Science and Information Engineering, Liaocheng University, Liaocheng, Shandong; 252000, China; 2.School of Computer and Communication, Lanzhou University of Technology, Lanzhou, Gansu; 730050, China 3.State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications, Beijing; 100876, China;
推荐引用方式 GB/T 7714	Zhang, Bin,Zhang, Xia,Zhang, Xiaoguang,et al. Theory for mode coupling in perturbed fibers[J]. Optics Communications,2020,463.
APA	Zhang, Bin.,Zhang, Xia.,Zhang, Xiaoguang.,Yang, Zhenshan.,Bai, Chenglin.,...&Cao, Minghua.(2020).Theory for mode coupling in perturbed fibers.Optics Communications,463.
MLA	Zhang, Bin,et al."Theory for mode coupling in perturbed fibers".Optics Communications 463(2020).