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Simultaneous measurement of curvature and strain based on fiber Bragg grating in two-dimensional waveguide array fiber

机译:二维波导阵列光纤中基于光纤布拉格光栅的曲率和应变同时测量

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摘要

We report on the fabrication of a fiber Bragg grating (FBG) with multiple resonances in a two-dimensional waveguide array microstructured optical fiber containing 91 cores. Theoretical investigation reveals that these resonances originate from the identical and nonidentical mode couplings between forward-propagating and backward-propagating LP_(0m)-like (m = 1, 2, 3; LP refers to linearly polarized) supermodes. Since both the central wavelength and minimum transmission of these resonant dips respond differently to curvature and axial strain, this FBG can be applied in the simultaneous measurement of curvature and axial strain.
机译:我们报告了在包含91个纤芯的二维波导阵列微结构化光纤中具有多个共振的光纤布拉格光栅(FBG)的制造。理论研究表明,这些共振源于向前传播和向后传播的类似LP_(0m)(m = 1、2、3; LP表示线性极化)的超模之间的相同和不同模式耦合。由于这些共振凹陷的中心波长和最小透射率对曲率和轴向应变的响应不同,因此该FBG可用于同时测量曲率和轴向应变。

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