Journal
OPTICS COMMUNICATIONS
Volume 285, Issue 24, Pages 5128-5131Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.optcom.2012.07.074
Keywords
Photonic crystal fiber; Optical fiber sensor; Intensity curvature sensor
Categories
Funding
- FCT-Fundacao para a Ciencia e a Tecnologia (Portuguese Foundation for Science and Technology) [SFRH/BD/76991/2011]
- ANEEL through TBE-Transmissoras Brasileiras de Energia
- ERDF-European Regional Development Fund through the COMPETE Programme
- National Funds through the FCT-Fundacao para a Ciencia e a Tecnologia (Portuguese Foundation for Science and Technology) [FCOMP 01-0124-FEDER-022701]
- Fundação para a Ciência e a Tecnologia [SFRH/BD/76991/2011] Funding Source: FCT
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An intensity curvature sensor using a Photonic Crystal Fiber (PCF) with three coupled cores is proposed. The three cores were aligned and there was an air hole between each two consecutive cores. The fiber had a low air filling fraction, which means that the cores remain coupled in the wavelength region studied. Due to this coupling, interference is obtained in the fiber output even if just a single core is illuminated. A configuration using reflection interrogation, which used a section fiber with 0.13 m as the sensing head, was characterized for curvature sensing. When the fiber is bended along the plane of the cores, one of the lateral cores will be stretched and the other compressed. This changes the coupling coefficient between the three cores, changing the output optical power intensity. The sensitivity of the sensing head was strongly dependent on the direction of bending, having its maximum when the bending direction was along the plane of the cores. A maximum curvature sensitivity of 2.0 dB/m(-1) was demonstrated between 0 m and 2.8 m. (C) 2012 Elsevier B.V. All rights reserved.
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