High-sensitivity optical fiber temperature sensor of cascaded FSI and MZI based on Vernier effect

被引：36

作者：

Jia, Xulong ^{[1
]}

Zhou, Xuefang ^{[1
]}

Bi, Meihua ^{[1
,2
]}

Yang, Guowei ^{[1
,2
]}

Hu, Miao ^{[1
]}

Wang, Tianshu ^{[2
]}

机构：

[1] Hangzhou Dianzi Univ, Sch Commun Engn, Hangzhou 310018, Zhejiang, Peoples R China

[2] Changchun Univ Sci & Technol, Natl & Local Joint Engn Res Ctr Space Optoelect T, Changchun 130022, Peoples R China

来源：

OPTICAL FIBER TECHNOLOGY | 2021年 / 65卷

关键词：

Temperature sensor; Vernier effect; Mach-Zehnder interferometer; Fiber Sagnac interferometer; INTERFEROMETERS;

D O I：

10.1016/j.yofte.2021.102625

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：

A high-sensitivity optical fiber temperature sensor based on the Vernier effect of cascaded fiber Sagnac interferometer (FSI) and Mach-Zehnder interferometer (MZI) is proposed and experimentally demonstrated. The FSI is composed of a 3 dB four-port coupler and a section of polarization maintaining fiber, which has high sensitivity and good stability as the sensing part. As the filtering part, MZI is made up of two three-port couplers by controlling the length of the two arms. The free spectral range (FSR) of these two interferometers is similar but not equal, so the cascade system can effectively amplify the temperature sensing sensitivity based on the vernier effect. The experimental results show that the temperature sensitivity of a single FSI is only -1.68 nm/degrees C, and the cascade system can amplify it to 14.30 nm/degrees C with a gain coefficient of 8.51, which is consistent with the theoretical results.

引用

页数：5

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