Sensitivity amplification of fiber-optic in-line Mach-Zehnder Interferometer sensors with modified Vernier-effect

被引：142
|
作者：
Liao, Hao [1 ,2 ]
Lu, Ping [1 ,2 ]
Fu, Xin [1 ,2 ]
Jiang, Xinyue [1 ,2 ]
Ni, Wenjun [1 ,2 ]
Liu, Deming [1 ,2 ]
Zhang, Jiangshan [3 ]
机构：
[1] Huazhong Univ Sci & Technol, Sch Opt & Elect Informat, WNLO, Wuhan 430074, Hubei, Peoples R China
[2] Huazhong Univ Sci & Technol, Sch Opt & Elect Informat, Natl Engn Lab Next Generat Internet Access Syst, Wuhan 430074, Hubei, Peoples R China
[3] Huazhong Univ Sci & Technol, Dept Elect & Informat Engn, Wuhan 430074, Hubei, Peoples R China
来源：
OPTICS EXPRESS | 2017年 / 25卷 / 22期
基金：
中国国家自然科学基金;
关键词：
PHOTONIC CRYSTAL FIBER; REFRACTIVE-INDEX; INTENSITY INTERROGATION; TEMPERATURE SENSOR; FORCE SENSOR; STRAIN; TAPER;
D O I：
10.1364/OE.25.026898
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
In this paper, a novel sensitivity amplification method for fiber-optic in-line Mach-Zehnder interferometer (MZI) sensors has been proposed and demonstrated. The sensitivity magnification is achieved through a modified Vernier-effect. Two cascaded in-line MZIs based on offset splicing of single mode fiber (SMF) have been used to verify the effect of sensitivity amplification. Vernier-effect is generated due to the small free spectral range (FSR) difference between the cascaded in-line MZIs. Frequency component corresponding to the envelope of the superimposed spectrum is extracted to take Inverse Fast Fourier Transform (IFFT). Thus we can obtain the envelope precisely from the messy superimposed spectrum. Experimental results show that a maximum sensitivity amplification factor of nearly 9 is realized. The proposed sensitivity amplification method is universal for the vast majority of in-line MZIs. (C) 2017 Optical Society of America
引用
收藏
页码：26898 / 26909
页数：12
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