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Spectral-Domain Measurements of Birefringence and Sensing Characteristics of a Side-Hole Microstructured Fiber
Sensors 2013, 13(9), 11653-11659; doi:10.3390/s130911653

A High-Temperature Fiber Sensor Using a Low Cost Interrogation Scheme

*  and
Optical and Quantum Communications Group, Institute of Telecommunications and Multimedia Applications (iTEAM), Universitat Politècnica de València, Valencia, 46022, Spain
* Author to whom correspondence should be addressed.
Received: 16 June 2013 / Revised: 24 August 2013 / Accepted: 29 August 2013 / Published: 4 September 2013
(This article belongs to the Special Issue Optomechatronics)
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Regenerated Fibre Bragg Gratings have the potential for high-temperature monitoring. In this paper, the inscription of Fibre Bragg Gratings (FBGs) and the later regeneration process to obtain Regenerated Fiber Bragg Gratings (RFBGs) in high-birefringence optical fiber is reported. The obtained RFBGs show two Bragg resonances corresponding to the slow and fast axis that are characterized in temperature terms. As the temperature increases the separation between the two Bragg resonances is reduced, which can be used for low cost interrogation. The proposed interrogation setup is based in the use of optical filters in order to convert the wavelength shift of each of the Bragg resonances into optical power changes. The design of the optical filters is also studied in this article. In first place, the ideal filter is calculated using a recursive method and defining the boundary conditions. This ideal filter linearizes the output of the interrogation setup but is limited by the large wavelength shift of the RFBG with temperature and the maximum attenuation. The response of modal interferometers as optical filters is also analyzed. They can be easily tuned shifting the optical spectrum. The output of the proposed interrogation scheme is simulated in these conditions improving the sensitivity.
Keywords: optical fibre sensor; high-temperature; Regenerated Fibre Bragg Grating; interrogation; modal interferometer optical fibre sensor; high-temperature; Regenerated Fibre Bragg Grating; interrogation; modal interferometer
This is an open access article distributed under the Creative Commons Attribution License (CC BY) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Barrera, D.; Sales, S. A High-Temperature Fiber Sensor Using a Low Cost Interrogation Scheme. Sensors 2013, 13, 11653-11659.

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