Fiber Bragg grating sensors in hollow single-and two-core eccentric fibers

被引：31
作者：
Mao, Guopei [1 ]
Yuan, Tingting [1 ]
Guan, Chunying [1 ]
Yang, Jing [1 ]
Chen, Lei [1 ]
Zhu, Zheng [1 ]
Shi, Jinhui [1 ]
Yuan, Libo [1 ]
机构：
[1] Harbin Engn Univ, Coll Sci, Key Lab In Fiber Integrated Opt, Minist Educ, Harbin 150001, Peoples R China
来源：
OPTICS EXPRESS | 2017年 / 25卷 / 01期
基金：
中国国家自然科学基金;
关键词：
MICROSTRUCTURED OPTICAL-FIBER; PHOTONIC CRYSTAL FIBER; LONG-PERIOD FIBER; AIR-HOLE SIZE; REFRACTIVE-INDEX;
D O I：
10.1364/OE.25.000144
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
Fiber Bragg gratings (FBGs) in a hollow eccentric fiber (HEF) have been proposed and demonstrated experimentally. The single-core and two-core HEF FBGs have been inscribed successfully using KrF excimer laser (248 nm), respectively. The temperature and axial strain sensing properties of the two samples have been measured. The experimental results indicate that the temperature and axial strain sensitivities of the two samples are similar, but they are smaller than that of conventional SMF-FBGs. Furthermore, the bending characteristics of the two-core HEF-FBG strongly depend on the bending direction due to the asymmetry of the fiber. Therefore, the proposed two-core HEF-FBGs facilitate temperature-compensated vector-bending sensing by measuring the difference between peak shifts of the two gratings. In addition, the two-core HEF-FBG can be a promising candidate for achieving two-channel filter since the signal crosstalk between the two cores can be largely eliminated by the central air hole. (C) 2017 Optical Society of America
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页码：144 / 150
页数：7
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