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Sensors 2012, 12(6), 7318-7325; doi:10.3390/s120607318

A Hybrid LPG/CFBG for Highly Sensitive Refractive Index Measurements

International Institute for Urban Systems Engineering, Southeast University, Nanjing 210096, Jiangsu, China
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Author to whom correspondence should be addressed.
Received: 28 March 2012 / Revised: 18 April 2012 / Accepted: 28 April 2012 / Published: 30 May 2012
(This article belongs to the Section Physical Sensors)
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Abstract

A simple and high sensitive method employing a hybrid long period grating (LPG)/chirped fiber Bragg grating (CFBG) for refractive index (RI) measurements is proposed and investigated experimentally. The wide wavelength range of backward cladding modes are excited through the coupling and recoupling between LPG and CFBG. Experimental results indicate that the recoupled cladding modes between LPG and CFBG and core mode are modulated by the surrounding RI and highly sensitive RI measurements can be achieved by simply measuring the reflected intensity changes of the recoupled cladding modes and core mode.
Keywords: optical fiber sensor; refractive index; hybrid FBG/LPG; cladding modes optical fiber sensor; refractive index; hybrid FBG/LPG; cladding modes
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Sun, A.; Wu, Z. A Hybrid LPG/CFBG for Highly Sensitive Refractive Index Measurements. Sensors 2012, 12, 7318-7325.

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