Fiber-end antireflection method for ultra-weak fiber Bragg grating sensing systems
Fiber-end antireflection method for ultra-weak fiber Bragg grating sensing systems
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DOI：
10.1088/1361-6501/abd797
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发表时间：
2021-05
影响因子：
2.4
通讯作者：
Z. Luo;Yu Zhang;Wensheng Cheng;Xiongbo Yang;Shuguang Zeng
中科院分区：
文献类型：
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作者：
Z. Luo;Yu Zhang;Wensheng Cheng;Xiongbo Yang;Shuguang Zeng
提出了一种新型的光纤端抗反射方法，用于降低超弱光纤布拉格光栅传感系统中的反射噪声。对光纤端增透原理进行了理论分析和仿真，并在此基础上设计和制作了光纤端增透结构。该方法将光纤端切成斜面，直接涂上与纤芯折射率相近的椭球型光敏紫外胶滴。利用超弱光纤光栅询问器对光纤端反射进行在线监测，通过控制UV固化时间来调节胶滴的折射率，达到最佳的反射抑制效果。结果表明，该方法可将光纤端反射降低到- 60 dB以下，有效消除了光纤端反射噪声对末级传感器的影响。因此，该方法为超弱光纤光栅传感系统的光纤端处理提供了一个很好的解决方案。
A novel fiber-end antireflection method for reducing the reflection noise in ultra-weak fiber Bragg grating (FBG) sensing systems is proposed in this study. The principle of fiber-end antireflection is analyzed and simulated theoretically, and then an antireflection structure is designed and fabricated. In this method, the fiber end is cut into an inclined surface and covered directly with an ellipsoid photosensitive ultraviolet (UV) glue drop, whose refractive index is similar to that of the fiber core. Under the online monitoring of the fiber-end reflection with the ultra-weak FBG interrogator, the refractive index of the glue drop is adjusted by controlling the UV curing time to achieve optimal reflection suppression. Results show that this method can reduce fiber-end reflection to less than −60 dB and effectively eliminate the influence of fiber-end reflection noise on the last sensor. The proposed method thus provides an excellent solution for the fiber-end processing of ultra-weak FBG sensing systems.