期刊
OPTICS COMMUNICATIONS
卷 283, 期 13, 页码 2690-2694出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.optcom.2010.03.013
关键词
Long period grating; Tilted fiber Bragg grating; Cladding mode recoupling; Bend sensor; Curvature measurement
类别
资金
- Natural Sciences and Engineering Research Council of Canada
- Canada Research Chairs
- LxDATA
We demonstrate a new type of fiber optic bend sensor with a hybrid structure made up of a long period grating (LPG) and a tilted fiber Bragg grating (TFBG). The sensing mechanism is based on the spectrum of power transfers between the core and cladding modes from a TFBG located downstream from a LPG. We show that the curvature of a beam can be determined by the reflected power difference between the core mode and the recoupled cladding modes. We further provide design rules for the LPG and TFBG to optimize and linearize the sensor response. In addition, the temperature cross-sensitivities of this configuration are also investigated for two different types of fiber. (C) 2010 Elsevier B.V. All rights reserved.
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