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Bending and orientational characteristics of long period gratings written in D-shaped optical fiber [directional bend sensors]

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7 Author(s)
Allsop, T. ; Photonics Res. Group, Aston Univ., Birmingham, UK ; Gillooly, A. ; Mezentsev, V. ; Earthgrowl-Gould, T.
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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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Instrumentation and Measurement, IEEE Transactions on  (Volume:53 ,  Issue: 1 )