title: High-Order Interference Effect Introduced by Polarization Mode Coupling in Polarization--Maintaining Fiber and Its Identification.
abstract: The high-order interference (HOI)-The interferogram introduced by polarization mode couplings (PMC) of multiple perturbations-Will cause misjudgment of the realistic coupling points in polarization-maintaining fiber (PMF) which is tested with a white light interferometer (WLI) with large dynamic range. We present an optical path tracking (OPT) method for simplifying the analysis of HOI, and demonstrate the enhancement and suppression conditions for the HOIs. A strategy is proposed to readily identify HOI by altering the spliced angle between polarizers' pigtails and the PMF under test. Moreover, a PMF experiment with two perturbation points, for simplicity, is given as an example. As a result, all the characteristic interferograms including HOIs can be distinguished through just four measurements. Utilizing this identification method, we can estimate the realistic coupling points in PMFs and distinguish them from the interference signals including numerous HOIs.
authors.affiliation: Key Laboratory of In-Fiber Integrated Optics, Ministry of Education, Harbin Engineering University, Harbin 150001, China. lichuang@hrbeu.edu.cn.|College of Science, Harbin Engineering University, Harbin 150001, China. lichuang@hrbeu.edu.cn.
authors.forename: Chuang
authors.initials: C
authors.lastname: Li
authors.affiliation: Key Laboratory of In-Fiber Integrated Optics, Ministry of Education, Harbin Engineering University, Harbin 150001, China. yangjun@hrbeu.edu.cn.|College of Science, Harbin Engineering University, Harbin 150001, China. yangjun@hrbeu.edu.cn.
authors.forename: Jun
authors.initials: J
authors.lastname: Yang
authors.affiliation: Key Laboratory of In-Fiber Integrated Optics, Ministry of Education, Harbin Engineering University, Harbin 150001, China. yuzhangjun@hrbeu.edu.cn.|College of Science, Harbin Engineering University, Harbin 150001, China. yuzhangjun@hrbeu.edu.cn.
authors.forename: Zhangjun
authors.initials: Z
authors.lastname: Yu
authors.affiliation: Key Laboratory of In-Fiber Integrated Optics, Ministry of Education, Harbin Engineering University, Harbin 150001, China. yuanyonggui@hrbeu.edu.cn.|College of Information and Communication Engineering, Harbin Engineering University, Harbin 150001, China. yuanyonggui@hrbeu.edu.cn.
authors.forename: Yonggui
authors.initials: Y
authors.lastname: Yuan
authors.affiliation: Key Laboratory of In-Fiber Integrated Optics, Ministry of Education, Harbin Engineering University, Harbin 150001, China. zhangjianzhong@hrbeu.edu.cn.|College of Science, Harbin Engineering University, Harbin 150001, China. zhangjianzhong@hrbeu.edu.cn.
authors.forename: Jianzhong
authors.initials: J
authors.lastname: Zhang
authors.affiliation: Key Laboratory of In-Fiber Integrated Optics, Ministry of Education, Harbin Engineering University, Harbin 150001, China. wubing@hrbeu.edu.cn.|College of Science, Harbin Engineering University, Harbin 150001, China. wubing@hrbeu.edu.cn.
authors.forename: Bing
authors.initials: B
authors.lastname: Wu
authors.affiliation: Key Laboratory of In-Fiber Integrated Optics, Ministry of Education, Harbin Engineering University, Harbin 150001, China. pengfeng@hrbeu.edu.cn.|College of Science, Harbin Engineering University, Harbin 150001, China. pengfeng@hrbeu.edu.cn.
authors.forename: Feng
authors.initials: F
authors.lastname: Peng
authors.affiliation: Key Laboratory of In-Fiber Integrated Optics, Ministry of Education, Harbin Engineering University, Harbin 150001, China. lbyuan@vip.sina.com.|College of Science, Harbin Engineering University, Harbin 150001, China. lbyuan@vip.sina.com.
authors.forename: Libo
authors.initials: L
authors.lastname: Yuan
keywords: optical fiber sensor; polarization mode coupling; polarization-maintaining fiber; white light interferometer