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Sensors 2016, 16(3), 419; doi:10.3390/s16030419

High-Order Interference Effect Introduced by Polarization Mode Coupling in Polarization—Maintaining Fiber and Its Identification

1
Key Laboratory of In-Fiber Integrated Optics, Ministry of Education, Harbin Engineering University, Harbin 150001, China
2
College of Science, Harbin Engineering University, Harbin 150001, China
3
College of Information and Communication Engineering, Harbin Engineering University, Harbin 150001, China
*
Author to whom correspondence should be addressed.
Academic Editor: Francesco De Leonardis
Received: 11 January 2016 / Revised: 10 March 2016 / Accepted: 10 March 2016 / Published: 22 March 2016
(This article belongs to the Section Physical Sensors)
View Full-Text   |   Download PDF [2529 KB, uploaded 22 March 2016]   |  

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. View Full-Text
Keywords: optical fiber sensor; polarization-maintaining fiber; white light interferometer; polarization mode coupling optical fiber sensor; polarization-maintaining fiber; white light interferometer; polarization mode coupling
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Li, C.; Yang, J.; Yu, Z.; Yuan, Y.; Zhang, J.; Wu, B.; Peng, F.; Yuan, L. High-Order Interference Effect Introduced by Polarization Mode Coupling in Polarization—Maintaining Fiber and Its Identification. Sensors 2016, 16, 419.

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