Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/20332
Title: Directional bend sensing with a CO2-Laser-Inscribed long period grating in a photonic crystal fiber
Authors: Jin, L
Jin, W 
Ju, J
Keywords: Directional bend sensing
Long period grating (LPG)
Optical fiber sensor
Photonic crystal fiber (PCF)
Issue Date: 2009
Publisher: IEEE-Inst Electrical Electronics Engineers Inc
Source: Journal of lightwave technology, 2009, v. 27, no. 21, p. 4884-4891 How to cite?
Journal: Journal of Lightwave Technology 
Abstract: In this paper, we present a directional bend sensor based on a long period grating (LPG) formed by introducing periodic grooves along one side of a photonic crystal fiber (PCF) with a focused CO2 laser beam. A bend sensitivity of 2.26 nm/m-1 within a range of -5 ∼ +5 m-1 is experimentally demonstrated. Numerical simulation suggests that the directional response is the result of asymmetric cladding geometry resulted from collapse and/or deformation of air holes and asymmetric material-index modulation caused by one-sided illumination of the CO2 laser beam. The sensitivity could be further enhanced by increasing the area of the air-silica photonic crystal cladding and optimizing the size of individual air holes. The easy fabrication process and good linear response of the proposed sensor make it a suitable candidate for structural shape sensing in harsh environments.
URI: http://hdl.handle.net/10397/20332
DOI: 10.1109/JLT.2009.2026723
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