Sensitivity-Enhanced Photonic Crystal Fiber Refractive Index Sensor With Two Waist-Broadened Tapers

被引：68
作者：
Zhao, Yong [1 ,2 ]
Xia, Feng [1 ]
Li, Jin [1 ]
机构：
[1] Northeastern Univ, Coll Informat Sci & Engn, Shenyang 110819, Peoples R China
[2] Northeastern Univ, State Key Lab Synthet Automat Proc Ind, Shenyang 110819, Peoples R China
来源：
JOURNAL OF LIGHTWAVE TECHNOLOGY | 2016年 / 34卷 / 04期
基金：
中国国家自然科学基金;
关键词：
Mach-Zehnder interferometer; photonic crystal fiber; refractive index sensing; waist-broadened single mode fiber-PCF-taper; MACH-ZEHNDER INTERFEROMETER; LONG-PERIOD GRATINGS; LABEL-FREE; REFRACTOMETER; STRAIN;
D O I：
10.1109/JLT.2016.2519534
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：
A new sensitivity-enhanced refractive index (RI) sensor based on photonic crystal fiber Mach-Zehnder interferometer (PCF-MZI) was proposed and experimentally demonstrated. It was realized by introducing a normal PCF-taper between two waist-broadened single mode fibers (SMF)-PCF-tapers, which were fabricated at the joints of a PCF and two SMFs using "over-lap" splicing technique. Via tapering the PCF, the maximum RI sensitivity is increased by a factor of 1.73 owing to the evanescent field. Consequently, a maximum RI sensitivity of 281.6 nm/RIU is successfully achieved in the RI range of 1.3333-1.3737, which is around ten times higher than the RI sensitivity of SMF-MZI with two or three-cascaded-taper. Moreover, the proposed three-taper PCF-MZI is independent on temperature from 20 to 55 degrees C. In addition to temperature immunity, it has advantages such as high RI sensitivity, ease of fabrication and measurement, compactness, and robustness.
引用
收藏
页码：1373 / 1379
页数：7
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