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HCPCF-Based In-Line Fiber Fabry-Perot Refractometer and High Sensitivity Signal Processing Method

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Abstract

An in-line fiber Fabry-Perot interferometer (FPI) based on the hollow-core photonic crystal fiber (HCPCF) for refractive index (RI) measurement is proposed in this paper. The FPI is formed by splicing both ends of a short section of the HCPCF to single mode fibers (SMFs) and cleaving the SMF pigtail to a proper length. The RI response of the sensor is analyzed theoretically and demonstrated experimentally. The results show that the FPI sensor has linear response to external RI and good repeatability. The sensitivity calculated from the maximum fringe contrast is –136 dB/RIU. A new spectrum differential integration (SDI) method for signal processing is also presented in this study. In this method, the RI is obtained from the integrated intensity of the absolute difference between the interference spectrum and its smoothed spectrum. The results show that the sensitivity obtained from the integrated intensity is about –1.34×105 dB/RIU. Compared with the maximum fringe contrast method, the new SDI method can provide the higher sensitivity, better linearity, improved reliability, and accuracy, and it’s also convenient for automatic and fast signal processing in real-time monitoring of RI.

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DOI:10.1007/s13320-017-0392-6

所属栏目:Regular

基金项目:This research is supported by the National Natural Science Foundations of China (Grant Nos. 61174018 and 61505097) and Fundamental research funds of Shandong University, China (Grant No. 2014YQ009).

收稿日期:2016-11-29

修改稿日期:2017-02-10

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作者单位    点击查看

Xiaohui LIU:School of Control Science and Engineering, Shandong University, Jinan, 250061, China
Mingshun JIANG:School of Control Science and Engineering, Shandong University, Jinan, 250061, China
Qingmei SUI:School of Control Science and Engineering, Shandong University, Jinan, 250061, China
Xiangyi GENG:School of Control Science and Engineering, Shandong University, Jinan, 250061, China
Furong SONG:School of Control Science and Engineering, Shandong University, Jinan, 250061, China

联系人作者:Mingshun JIANG(jiangmingshun@sdu.edu.cn)

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引用该论文

Xiaohui LIU,Mingshun JIANG,Qingmei SUI,Xiangyi GENG,Furong SONG. HCPCF-Based In-Line Fiber Fabry-Perot Refractometer and High Sensitivity Signal Processing Method[J]. Photonic Sensors, 2017, 7(4): 336-344

Xiaohui LIU,Mingshun JIANG,Qingmei SUI,Xiangyi GENG,Furong SONG. HCPCF-Based In-Line Fiber Fabry-Perot Refractometer and High Sensitivity Signal Processing Method[J]. Photonic Sensors, 2017, 7(4): 336-344

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