High-Sensitive Fiber-Optic Refractometer Based on a Core-Diameter-Mismatch Mach-Zehnder Interferometer

被引：81
作者：
Rong, Qiangzhou [1 ]
Qiao, Xueguang [1 ]
Wang, Ruohui [1 ]
Sun, Hao [1 ]
Hu, Manli [1 ]
Feng, Zhongyao [1 ]
机构：
[1] NW Univ Xian, Dept Phys, Xian 710069, Peoples R China
来源：
IEEE SENSORS JOURNAL | 2012年 / 12卷 / 07期
基金：
中国国家自然科学基金;
关键词：
Fiber optics; fiber optics sensors; REFRACTIVE-INDEX SENSOR; MODAL INTERFEROMETER;
D O I：
10.1109/JSEN.2012.2194700
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：
An in-fiber Mach-Zehnder interferometer (MZI) for high-sensitive refractive index (RI) measurement is proposed and experimentally demonstrated. The sensing head is formed by a single-mode fiber (SMF) sandwiched between two short sections of thin-core fibers (TCFs), i.e., TCF-SMF-TCF MZI configuration with a length of 9 mm. A well-defined interference pattern is obtained as the result of fiber-core mismatch and core-cladding modes interference. The selected interference dip is extremely sensitive to ambient RI, providing a stable RI response with sensitivity up to 159 nm/RIU for water-based solutions close to the RI of 1.33, making it a good candidate for bio-chemical measurements.
引用
收藏
页码：2501 / 2505
页数：5
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