Highly Sensitive Bend Sensor Based on Bragg Grating in Eccentric Core Polymer Fiber

We report on an optical bend sensor based on a Bragg grating inscribed in an eccentric core polymer optical fiber. The device exhibits the strong fiber orientation dependence, the wide bend curvature range of ±22.7 m<sup>-1</sup>, and high bend sensitivity of 63 pm/m<sup>-1</sup>.

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