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

页码：2501 / 2505

页数：5

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