Bending and orientational characteristics of long period gratings written in D-shaped optical fiber


Long period gratings (LPGs) were written into a D-shaped single-mode fiber. These LPGs were subjected to a range of curvatures, and it was found that as curvature increased, there was increasingly strong coupling to certain higher order cladding modes without the usual splitting of the LPGs stopbands. A bend-induced stopband yielded a spectral sensitivity of 12.55 nm·m for curvature and 2.2×10-2 nm°C-1 for temperature. It was also found that the wavelength separation between adjacent bend-induced stopbands varied linearly as a function of curvature. Blue and red wavelength shifts of the stopbands were observed as the sensor was rotated around a fixed axis for a given curvature; thus, in principle, this sensor could be used to obtain bending and orientational information. The behavior of the stopbands was successfully modeled using a finite element approach.

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Divisions: College of Engineering & Physical Sciences > School of Computer Science and Digital Technologies > Electronics & Computer Engineering
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Uncontrolled Keywords: bending, coupled mode analysis, diffraction gratings, fibre optic sensors, finite element analysis, position measurement, spectral line shift, surement, D-shaped single-mode optical fiber, FEM, curvature measurement, bend sensors, bend-induced stopband spectral sensitivity, bend-induced stopbands, blue wavelength shift, fiber bending characteristics, fiber orientational characteristics, higher order cladding mode coupling, long period gratings, red shift, sensor rotation, stopband wavelength separation, temperature measurement
Publication ISSN: 0018-9456
Last Modified: 23 Oct 2019 10:34
Date Deposited: 14 Dec 2010 09:58
Full Text Link: http://www.scop ... tnerID=8YFLogxK
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Published Date: 2004-02
Authors: Allsop, Thomas D.P.
Gillooly, Andrew M.
Mezentsev, Vladimir
Earthgrowl-Gould, T.
Neal, Ron
Webb, David J.
Bennion, Ian

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