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Sensors 2017, 17(12), 2744; doi:10.3390/s17122744

All-Fiber Laser Curvature Sensor Using an In-Fiber Modal Interferometer Based on a Double Clad Fiber and a Multimode Fiber Structure

1
CONACYT—FCFM, Universidad Autónoma de Nuevo León, Av. Universidad S/N, Ciudad Universitaria, San Nicolás de los Garza, Nuevo León 66455, Mexico
2
CONACYT—Optics department, Instituto Nacional de Astrofísica, Óptica y Electrónica, L. E. Erro 1, Sta. Ma. Tonantzintla, Puebla 72824, Mexico
3
FCFM, Universidad Autónoma de Nuevo León, Av. Universidad S/N, Ciudad Universitaria, San Nicolás de los Garza, Nuevo León 66455, Mexico
4
Optics Department, Instituto Nacional de Astrofísica, Óptica y Electrónica, L. E. Erro 1, Sta. Ma. Tonantzintla, Puebla 72824, Mexico
*
Author to whom correspondence should be addressed.
Received: 28 September 2017 / Revised: 31 October 2017 / Accepted: 7 November 2017 / Published: 28 November 2017
(This article belongs to the Special Issue Optical Fiber Sensors 2017)
View Full-Text   |   Download PDF [6346 KB, uploaded 28 November 2017]   |  

Abstract

An all-fiber curvature laser sensor by using a novel modal interference in-fiber structure is proposed and experimentally demonstrated. The in-fiber device, fabricated by fusion splicing of multimode fiber and double-clad fiber segments, is used as wavelength filter as well as the sensing element. By including a multimode fiber in an ordinary modal interference structure based on a double-clad fiber, the fringe visibility of the filter transmission spectrum is significantly increased. By using the modal interferometer as a curvature sensitive wavelength filter within a ring cavity erbium-doped fiber laser, the spectral quality factor Q is considerably increased. The results demonstrate the reliability of the proposed curvature laser sensor with advantages of robustness, ease of fabrication, low cost, repeatability on the fabrication process and simple operation. View Full-Text
Keywords: fiber optic laser sensor; modal in-fiber interferometer; curvature measurement; erbium-doped fiber laser fiber optic laser sensor; modal in-fiber interferometer; curvature measurement; erbium-doped fiber laser
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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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MDPI and ACS Style

Álvarez-Tamayo, R.I.; Durán-Sánchez, M.; Prieto-Cortés, P.; Salceda-Delgado, G.; Castillo-Guzmán, A.A.; Selvas-Aguilar, R.; Ibarra-Escamilla, B.; Kuzin, E.A. All-Fiber Laser Curvature Sensor Using an In-Fiber Modal Interferometer Based on a Double Clad Fiber and a Multimode Fiber Structure. Sensors 2017, 17, 2744.

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