Long period grating in multicore optical fiber: an ultra-sensitive vector bending sensor for low curvatures
Long period grating in multicore optical fiber: an ultra-sensitive vector bending sensor for low curvatures
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DOI：
10.1364/ol.39.003508
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发表时间：
2014-06-15
期刊：
影响因子：
3.6
通讯作者：
Roth, Martin M.
中科院分区：
文献类型：
--
作者：
Saffari, Pouneh;Allsop, Thomas;Roth, Martin M.
在120个单模纤芯的多芯光纤中紫外写入长周期光栅。承载光栅的多芯光纤在两端被熔接成单模光纤。拼接在两种类型的光纤之间产生锥形过渡，产生非绝热模式演变;这导致多芯光纤中的所有模式的照明。研究了这种光纤器件的光谱特性随曲率的变化。该器件在0 ~ 1 m（-1）的超低曲率范围内，光谱灵敏度分别高达1.23nm/m（-1）和3.57dB/m（-1）。该光纤装置还可以区分光纤所经历的曲率的取向，作为产生蓝色或红色波长偏移的长周期光栅衰减带。利用有限元模型研究了多芯光纤中的模式行为，并预测了刻在多芯光纤中的长周期光栅的相位匹配曲线。(C)2014年美国光学学会
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. (C) 2014 Optical Society of America