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首页> 外文期刊>Optics Letters >Long period grating in multicore optical fiber: an ultra-sensitive vector bending sensor for low curvatures
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Long period grating in multicore optical fiber: an ultra-sensitive vector bending sensor for low curvatures

机译：多芯光纤中的长周期光栅：用于低曲率的超灵敏矢量弯曲传感器

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摘要

Long period grating was UV inscribed into a multicore fiber consisting of 120 single mode cores. The multicore fiber that hosts the grating was fusion spliced into a single mode fiber at both ends. The splice creates a taper transition between the two types of fiber that produces a nonadiabatic mode evolution; this results in the illumination of all the modes in the multicore fiber. The spectral characteristics of this fiber device as a function of curvature were investigated. The device yielded a significant spectral sensitivity as high as 1.23 nm/m~(-1) and 3.57 dB/m~(-1) to the ultra-low curvature values from 0 to 1 m~(-1). This fiber device can also distinguish the orientation of curvature experienced by the fiber as the long period grating attenuation bands producing either a blue or red wavelength shift. The finite element method (FEM) model was used to investigate the modal behavior in multicore fiber and to predict the phase-matching curves of the long period grating inscribed into multicore fiber.
机译：长周期光栅被紫外线刻入由120个单模芯组成的多芯光纤中。承载光栅的多芯光纤在两端熔接成单模光纤。熔接在两种类型的光纤之间产生锥形过渡，从而产生非绝热模式演变;这导致多芯光纤中所有模式的照明。研究了该光纤器件随曲率变化的光谱特性。该器件对0-1 m~（-1）的超低曲率值具有高达1.23 nm/m~（-1）和3.57 dB/m~（-1）的显著光谱灵敏度。该光纤器件还可以将光纤所经历的曲率方向区分为产生蓝色或红色波长偏移的长周期光栅衰减带。采用有限元法（FEM）模型研究了多芯光纤的模态行为，并预测了多芯光纤中长周期光栅的相位匹配曲线。

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