Temperature-insensitive refractive index sensor based on Mach–Zehnder interferometer with two microcavities  

作　　者：汪银风 王素梅 姜澜 黄华 张柳超 王鹏 吕灵亚 曹志涛 

机构地区：[1]Laser Micro/Nano Fabrication Laboratory, School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China [2]Vibration and Noise Control Laboratory, School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China [3]School of Optoelectronics, Beijing Institute of Technology, Beijing 100081, China

出　　处：《Chinese Optics Letters》2017年第2期25-29,共5页中国光学快报（英文版）

基　　金：supported by the Ministry of Science and Technology of China (MOST) (No. 2015AA043504);the National Natural Science Foundation of China (NSFC) (Nos. 91323301 and 51575053)

摘　　要：We propose a temperature-insensitive refractive index（RI） fiber sensor based on a Mach–Zehnder interferometer. The sensor with high sensitivity and a robust structure is fabricated by splicing a short photonic crystal fiber（PCF） between two single-mode fibers, where two microcavities are formed at both junctions because of the collapse of the PCF air holes. The microcavity with a larger equatorial dimension can excite higher-order cladding modes, so the sensor presents a high RI sensitivity, which can reach 244.16 nm/RIU in the RI range of1.333–1.3778. Meanwhile it has a low temperature sensitivity of 0.005 nm/°C in the range of 33°C–360°C.We propose a temperature-insensitive refractive index（RI） fiber sensor based on a Mach–Zehnder interferometer. The sensor with high sensitivity and a robust structure is fabricated by splicing a short photonic crystal fiber（PCF） between two single-mode fibers, where two microcavities are formed at both junctions because of the collapse of the PCF air holes. The microcavity with a larger equatorial dimension can excite higher-order cladding modes, so the sensor presents a high RI sensitivity, which can reach 244.16 nm/RIU in the RI range of1.333–1.3778. Meanwhile it has a low temperature sensitivity of 0.005 nm/°C in the range of 33°C–360°C.

关 键 词：Crystal structure Holey fibers INTERFEROMETERS MACH Zehnder interferometers MICROCAVITIES Nonlinear optics Optical fiber fabrication Photonic crystal fibers REFRACTOMETERS Single mode fibers Temperature 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]