Journal
OPTICS LETTERS
Volume 41, Issue 6, Pages 1201-1204Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.41.001201
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Funding
- Natural Sciences and Engineering Research Council of Canada (NSERC) [2014-05612]
- Canada Research Chairs
- National Natural Science Foundation of China (NSFC) [60727004, 61077060]
- Ministry of Education Project of Science and Technology Innovation [Z08119]
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Off-axis fiber Bragg gratings are inscribed by ultraviolet irradiation limited to expose only a portion of the fiber core cross section. The coupling to cladding modes is significantly increased, and the amplitude of the cladding mode resonances becomes sensitive to bending in magnitude and direction. Sensitivities ranging from +1.17 dB/m(-1) to -1.25 dB/m(-1) were obtained for bending in different directions relative to the offset direction of the grating, for curvatures from 0 to 1.1 m(-1), a range ideal for the shape sensing of large structures. The bending sensor response is also shown to be independent of temperature and the surrounding refractive index. (C) 2016 Optical Society of America
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