Sensing Characteristics of Long-Period Fiber Gratings Written in Thinned Cladding Fiber

被引：19

作者：

Zhao, Yunhe ^{[1
]}

Liu, Yunqi ^{[1
]}

Zhou, Chao ^{[1
]}

Guo, Qiang ^{[1
]}

Wang, Tingyun ^{[1
]}

机构：

[1] Shanghai Univ, Sch Commun & Informat Engn, Key Lab Specialty Fiber Opt & Opt Access Networks, Shanghai 200072, Peoples R China

来源：

IEEE SENSORS JOURNAL | 2016年 / 16卷 / 05期

基金：

中国国家自然科学基金;

关键词：

Long-period fiber gratings; thinned cladding fiber; optical sensor; DISPERSION TURNING-POINT; REFRACTIVE-INDEX; TRANSITION MODE; OPTICAL-FIBER; SENSOR; FILM; SENSITIVITY; TEMPERATURE; DESIGN;

D O I：

10.1109/JSEN.2015.2501411

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

We demonstrate the fabrication of the long-period fiber gratings (LPFGs) in the thinned cladding fiber by CO2 laser and the characteristics of the gratings is experimentally investigated for the sensor application. The cladding modes are excited in the thinned cladding fiber, which is found to be highly sensitive to the surrounding index changes. A high index sensitivity of 7366.6 nm/refractive index unit (RIU) was achieved, which is much higher than that of the same order cladding mode of the common LPFGs written in the conventional single-mode fibers. In addition, the over-coupled LPFGs obtain a higher grating contrast in the index sensitive region (1.447-1.457), which is helpful for the wavelength detection. The temperature and bending sensitivities of this promising refractive index sensor were measured to be 70.85 pm/degrees C and 2.32 dB/m(-1), respectively.

引用

页码：1217 / 1223

页数：7

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