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

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Received: 28 March 2013; in revised form: 20 May 2013 / Accepted: 2 July 2013 / Published: 10 July 2013
(This article belongs to the Section Physical 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.
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
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MDPI and ACS Style

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.

AMA Style

Zhang Q, Ianno NJ, Han M. Fiber-Optic Refractometer Based on an Etched High-Q π-Phase-Shifted Fiber-Bragg-Grating. Sensors. 2013; 13(7):8827-8834.

Chicago/Turabian Style

Zhang, Qi; Ianno, Natale J.; Han, Ming. 2013. "Fiber-Optic Refractometer Based on an Etched High-Q π-Phase-Shifted Fiber-Bragg-Grating." Sensors 13, no. 7: 8827-8834.

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