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Bragg gratings in surface-core fibers: Refractive index and directional curvature sensing

Osório, J. H. ; Oliveira, R. ; Aristilde, S. ; Chesini, G. ; Franco, M. A. R. ; Nogueira, R.N. ; Cordeiro, C. M. B.

Optical Fiber Technology Vol. 34, Nº 1, pp. 86 - 90, March, 2017.

ISSN (print): 1095-9912
ISSN (online): 1068-5200

Journal Impact Factor: 1,300 (in 2014)

Digital Object Identifier: 10.1016/j.yofte.2017.01.007

In this paper, we report, to our knowledge, the first extended study of the inscription of Bragg gratings in surface-core fibers and their application in refractive index and directional curvature sensing. The research ranges from fiber fabrication and grating inscription in untapered and tapered fibers to the per- formance of simulations and sensing measurements. Maximum sensitivities of 40 nm/RIU and 202.7 pm/ m?1 were attained in refractive index and curvature measurements respectively. The obtained results compares well to other fiber Bragg grating based devices. Ease of fabrication, robustness and versatility makes surface-core fibers an interesting platform when exploring fiber sensing devices