Abstract
In this paper, the pressure response of fiber Bragg gratings in grapefruit
microstructured fibers was experimentally investigated and theoretically analyzed with
full-vector finite element method. The theoretical calculation agrees well with the
experimental results. The pressure changes the refractive index and induces axial strain
of the fiber. The radial pressure induces positive strain, but axial pressure induces
negative strain. The negative strain dominates. The existence of large air holes make
grapefruit microstructured fibers experience larger negative strain than standard
single-mode fiber, therefore fiber Bragg gratings in grapefruit microstructured fibers
have larger pressure sensitivity than that in SMF.
© 2010 IEEE
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