Compact gas refractometer based on a tapered four-core fiber

被引：9
|
作者：
Shao, Zhihua [1 ]
Qiao, Xueguang [1 ]
Rong, Qiangzhou [1 ]
机构：
[1] Northwest Univ, Sch Phys, Xian 710069, Shaanxi, Peoples R China
来源：
APPLIED OPTICS | 2018年 / 57卷 / 35期
基金：
中国国家自然科学基金;
关键词：
FABRY-PEROT-INTERFEROMETER; REFRACTIVE-INDEX; HIGH-SENSITIVITY; HIGH-RESOLUTION; SENSOR; NITROGEN;
D O I：
10.1364/AO.57.010198
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
A compact in-line interferometer is proposed and experimentally demonstrated for gas refractive index (GRI) measurement. The sensor comprises a tapered four-core fiber (TFCF) sandwiched between two single-mode fibers (SMFs), forming an in-line SMF-TFCF-SMF structure. The fiber taper acts as a bridge between the external GRI variation and the multimode interference within the TFCF segment. A high sensitivity of 1280.94 dB/refractive index unit is obtained in Gill measurement around 1.0. Temperature change only shifts the interference wavelength, and the cross-sensitivity of temperature can be ignored by intensity demodulation. The proposed gas refractometer, with its improved performance, can be a good candidate for chemical sensing or bio-sensing. (C) 2018 Optical Society of America
引用
收藏
页码：10198 / 10206
页数：9
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