Long period grating in multicore optical fiber:an ultra-sensitive vector bending sensor for low curvatures

Saffari, Pouneh, Allsop, Thomas D.P., Adebayo, Adedotum, Webb, David J., Haynes, Roger and Roth, Martin M. (2014). Long period grating in multicore optical fiber:an ultra-sensitive vector bending sensor for low curvatures. Optics Letters, 39 (12), pp. 3508-3511.


Long period grating was UV inscribed into a multicore fiber consisting of 120 single mode cores. The multicore fiber that hosts the grating was fusion spliced into a single mode fiber at both ends. The splice creates a taper transition between the two types of fiber that produces a nonadiabatic mode evolution; this results in the illumination of all the modes in the multicore fiber. The spectral characteristics of this fiber device as a function of curvature were investigated. The device yielded a significant spectral sensitivity as high as 1.23 nm/m-1 and 3.57 dB/m-1 to the ultra-low curvature values from 0 to 1 m-1. This fiber device can also distinguish the orientation of curvature experienced by the fiber as the long period grating attenuation bands producing either a blue or red wavelength shift. The finite element method (FEM) model was used to investigate the modal behavior in multicore fiber and to predict the phase-matching curves of the long period grating inscribed into multicore fiber.

Publication DOI: https://doi.org/10.1364/OL.39.003508
Divisions: Engineering & Applied Sciences > Electrical, Electronic & Power Engineering
Engineering & Applied Sciences > Aston Institute of Photonics Technology
Additional Information: © 2014 Optical Society of America. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modifications of the content of this paper are prohibited.
Uncontrolled Keywords: Atomic and Molecular Physics, and Optics
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Related URLs: http://www.scop ... tnerID=8YFLogxK (Scopus URL)
Published Date: 2014-06-15
Authors: Saffari, Pouneh
Allsop, Thomas D.P.
Adebayo, Adedotum
Webb, David J. ( 0000-0002-5495-1296)
Haynes, Roger
Roth, Martin M.



Version: Accepted Version

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