Simultaneous measurement of temperature and refractive index based on a core-offset Mach-Zehnder interferometer cascaded with a long-period fiber grating  

作　　者：曹晔 刘慧莹 童峥嵘 袁硕 赵舜 

机构地区：[1]Key Laboratory of Film Electronics and Communication Devices, Tianjin University of Technology

出　　处：《Optoelectronics Letters》2015年第1期69-72,共4页光电子快报（英文版）

基　　金：supported by the National High Technology Research and Development Program(No.2013AA014200);the National Natural Science Foundation of China(No.61107052);the Natural Science Foundation of Tianjin(No.14JCYBJC16500);the Tianjin University's Science and Technology Development Fund Projects(No.2012)

摘　　要：An all-fiber sensor based on a cascaded optical fiber device is proposed and demonstrated, and its sensor head is composed of a core-offset Mach-Zehnder interferometer(MZI) and a long-period fiber grating(LPFG). In the experiment, two dips shaped by the intermodulation between the interference fringe of MZI and the resonant wavelength of LPFG are monitored. Experimental results show that temperature sensitivities of two dips are 0.060 7 nm/°C and 0.056 3 pm/°C, and the refractive index(RI) sensitivities are –18.025 nm/RIU and –55.06 nm/RIU, respectively. The simultaneous measurement of the temperature and external RI is demonstrated based on the sensitive matrix. Its low fabrication cost, simple configuration and high sensitivity make this sensor have potential applications in chemical and biological sensing.

关 键 词：ultraviolet keying programmable NLOS receiver demodulation elevation preprocessing utilized symbol 

分 类 号：TH744.3[机械工程—光学工程] TP212[机械工程—仪器科学与技术]