Abstract
Spatially arrayed long period gratings (LPGs) are inscribed in a multicore fiber by CO2 laser. The LPGs in the center core and one outer core exhibit different responses to bending and temperature. The directional bending sensor based on the LPGs has large sensitivity even for ultra-low curvature values ranging from 0 to 0.359 m−1.
© 2017 Optical Society of America
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