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Sensors 2013, 13(2), 2349-2358; doi:10.3390/s130202349
Article

High-Visibility Photonic Crystal Fiber Interferometer as Multifunctional Sensor

1,* , 2
 and
3
1 Corning Cable Systems S.A. de C.V. Reynosa Plant, Cd. Reynosa, Tamaulipas 88730, Mexico 2 Institute of Photonic Technology, Albert Einstein Str. 9, Jena 07745, Germany 3 Aston Institute of Photonic Technologies, Aston University, Aston Triangle, Birmingham B4 7ET, UK
* Author to whom correspondence should be addressed.
Received: 31 December 2012 / Accepted: 4 February 2013 / Published: 8 February 2013
(This article belongs to the Special Issue Photonic Crystal Sensors)
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Abstract

A photonic crystal fiber (PCF) interferometer that exhibits record fringe contrast (~40 dB) is demonstrated along with its sensing applications. The device operates in reflection mode and consists of a centimeter-long segment of properly selected PCF fusion spliced to single mode optical fibers. Two identical collapsed zones in the PCF combined with its modal properties allow high-visibility interference patterns. The interferometer is suitable for refractometric and liquid level sensing. The measuring refractive index range goes from 1.33 to 1.43 and the maximum resolution is ~1.6 × 10−5.
Keywords: interferometry; modal interference; photonic crystal fibers; refractive index sensors; liquid level sensors interferometry; modal interference; photonic crystal fibers; refractive index sensors; liquid level sensors
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.

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Cárdenas-Sevilla, G.A.; Fávero, F.C.; Villatoro, J. High-Visibility Photonic Crystal Fiber Interferometer as Multifunctional Sensor. Sensors 2013, 13, 2349-2358.

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