Journal
OPTICS LETTERS
Volume 39, Issue 12, Pages 3508-3511Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.39.003508
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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. (C) 2014 Optical Society of America
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