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Sensors 2018, 18(5), 1540; https://doi.org/10.3390/s18051540

A Novel Mach-Zehnder Interferometer Using Eccentric-Core Fiber Design for Optical Coherence Tomography

1
National Engineering Laboratory for Fiber Optic Sensing Technology, Wuhan University of Technology, Wuhan 430074, China
2
School of Information Engineering, Wuhan University of Technology, Wuhan 430074, China
*
Author to whom correspondence should be addressed.
Received: 18 March 2018 / Revised: 9 May 2018 / Accepted: 9 May 2018 / Published: 13 May 2018
(This article belongs to the Section Physical Sensors)
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Abstract

A novel Mach-Zehnder interferometer using eccentric-core fiber (ECF) design for optical coherence tomography (OCT) is proposed and demonstrated. Instead of the commercial single-mode fiber (SMF), the ECF is used as one interference arm of the implementation. Because of the offset location of the eccentric core, it is sensitive to directional bending and the optical path difference (OPD) of two interference arms can be adjusted with high precision. The birefringence of ECF is calculated and experimentally measured, which demonstrates the polarization sensitivity of the ECF proposed in the paper is similar to that of SMF. Such a structure can replace the reference optical delay line to form an all-fiber passive device. A mirror is used as a sample for analyzing the ECF bending responses of the system. Besides, four pieces of overlapping glass slides as sample are experimentally measured as well. View Full-Text
Keywords: eccentric core fiber; optical coherence tomography; Mach-Zehnder interferometer eccentric core fiber; optical coherence tomography; Mach-Zehnder interferometer
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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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Xiong, Q.; Tong, X.; Deng, C.; Zhang, C.; Wang, P.; Zheng, Z.; Liu, F. A Novel Mach-Zehnder Interferometer Using Eccentric-Core Fiber Design for Optical Coherence Tomography. Sensors 2018, 18, 1540.

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