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Sensors 2013, 13(7), 8827-8834; doi:10.3390/s130708827
Article

Fiber-Optic Refractometer Based on an Etched High-Q π-Phase-Shifted Fiber-Bragg-Grating

,
 and
*
Department of Electrical Engineering, University of Nebraska-Lincoln, Lincoln, NE 68588, USA
* Author to whom correspondence should be addressed.
Received: 28 March 2013 / Revised: 20 May 2013 / Accepted: 2 July 2013 / Published: 10 July 2013
(This article belongs to the Section Physical Sensors)
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Abstract

We present a compact and highly-sensitive fiber-optic refractometer based on a high-Q p-phase-shifted fiber-Bragg-grating (pFBG) that is chemically etched to the core of the fiber. Due to the p phase-shift, a strong pFBG forms a high-Q optical resonator and the reflection spectrum features an extremely narrow notch that can be used for highly sensitivity refractive index measurement. The etched pFBG demonstrated here has a diameter of ~9.3 μm and a length of only 7 mm, leading to a refractive index responsivity of 2.9 nm/RIU (RIU: refractive index unit) at an ambient refractive index of 1.318. The reflection spectrum of the etched pFBG features an extremely narrow notch with a linewidth of only 2.1 pm in water centered at ~1,550 nm, corresponding to a Q-factor of 7.4 ´ 105, which allows for potentially significantly improved sensitivity over refractometers based on regular fiber Bragg gratings.
Keywords: fiber gratings; optical fiber sensors; optical resonators; refractive index fiber gratings; optical fiber sensors; optical resonators; refractive index
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Zhang, Q.; Ianno, N.J.; Han, M. Fiber-Optic Refractometer Based on an Etched High-Q π-Phase-Shifted Fiber-Bragg-Grating. Sensors 2013, 13, 8827-8834.

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