Bending and orientational characteristics of long period gratings written in D-shaped optical fiber [directional bend sensors]
作者： T. Allsop , A. Gillooly , V. Mezentsev , T. Earthgrowl-Gould , R. Neal
关键词: Optical fiber 、 Temperature measurement 、 Wavelength 、 Stopband 、 Diffraction grating 、 Spectral sensitivity 、 Optics 、 Materials science 、 Curvature 、 Cladding (fiber optics)
摘要: Long period gratings (LPGs) were written into a D-shaped single-mode fiber. These LPGs subjected to range of curvatures, and it was found that as curvature increased, there increasingly strong coupling certain higher order cladding modes without the usual splitting stopbands. A bend-induced stopband yielded spectral sensitivity 12.55 nm/spl middot/m for 2.2/spl times/10/sup -2/ deg/C/sup -1/ temperature. It also wavelength separation between adjacent stopbands varied linearly function curvature. Blue red shifts observed sensor rotated around fixed axis given curvature; thus, in principle, this could be used obtain bending orientational information. The behavior successfully modeled using finite element approach.
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