Investigation of curvature sensitivity of arc-induced long-period fiber gratings inscribed in a pure silica photonic crystal fiber with two large air holes in the outer cladding region

An arc-induced long period grating within a photonic crystal fiber with two large-diameter air holes in the cladding region has been shown as a novel curvature sensor. Due to its panda structure, the sensitivity to curvature has been shown to be angular dependent.