Sensitivity Characterization of Cascaded Long-Period Gratings Operating near the Phase-Matching Turning Point

被引：6

作者：

Zhou, Wei ^{[1
]}

Ran, Yanli ^{[1
]}

Yan, Zhijun ^{[2
]}

Sun, Qizhen ^{[2
]}

Liu, Chen ^{[2
]}

Liu, Deming ^{[2
]}

机构：

[1] Shenzhen Univ, Inst Microscale Optoelect IMO, Shenzhen 518060, Peoples R China

[2] Huazhong Univ Sci & Technol, Sch Opt & Elect Informat, Natl Engn Lab Next Generat Internet Access Syst, Wuhan 430074, Peoples R China

来源：

SENSORS | 2020年 / 20卷 / 21期

关键词：

long period fiber grating; optical fiber sensors; phase-matching turning point; quality factor; FIBER GRATINGS; SENSOR;

D O I：

10.3390/s20215978

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

We characterized a cascaded long-period gratings (LPGs)-based sensor that was operating at the phase-matching turning point (PMTP). The cascaded LPGs constructed an in-fiber Mach-Zehnder interferometer (MZI), which exhibited a series of high-quality-factor (Q) narrow-bandwidth resonance peaks. As the LPG operated at the PMTP, the proposed sensor showed an ultrahigh refractive index (RI) and temperature sensitivity, and high measurement precision. In this study, we took an in-depth look at the effects of grating separation on Q-factor and sensitivity. The results showed that the sensitivity to the surrounding refractive index (SRI) reached 4741.5 nm/RIU at 1.4255 and 2138 nm/RIU, over the range of 1.335-1.373. In addition, the temperature sensitivity was around 4.84 nm/degrees C. With a 0.02 nm wavelength resolution, the RI and temperature sensing limits were 9.3 x 10(-6) RIU and 5.5 x 10(-3) degrees C.

引用

页码：1 / 10

页数：10

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