期刊
OPTICAL FIBER TECHNOLOGY
卷 80, 期 -, 页码 -出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.yofte.2023.103481
关键词
Fiber optic sensor; Double cladding fiber; Mode transition; Mach-Zehnder interferometer; Refractive index sensor
This work presents a new in-fiber Mach-Zehnder interferometer (MZI) device that utilizes mode transition phenomena to enhance sensitivity to external refractive index. The MZI structure is simple, consisting of a small section of single mode double cladding fiber (DCF) between two sections of standard single mode fiber. The sensitivity is enhanced by inducing cladding mode transition through tailoring the cladding thickness of the DCF.
This work reports on a novel in-fiber Mach-Zehnder interferometer (MZI) device which is able to exploit the mode transition phenomena to tailor the sensitivity to external refractive index (RI). The proposed MZI structure is extremely simple: it consists of a small section of single mode double cladding fiber (DCF) in between two sections of standard single mode fiber using the core-offset splicing approach. The DCF presents a W-shaped RI profile with the outer cladding having a greater RI than the inner cladding. Therefore, the mode transition of cladding modes from outer to inner cladding of the DCF can be induced by tailoring the cladding thickness, in turn enhancing the sensitivity to surrounding refractive index. Specifically, wet chemical etching employing hydrofluoric acid is used to reduce the outer cladding diameter. Here, we report a comprehensive study of the phenomena while fiber diameter is decreased by 30 & mu;m. Moreover, a specific study case with DCF diameter of 112 & mu;m demonstrates a sensitivity gain of 2.5 over unetched fiber in the refractive index range of 1.33-1.39. Temperature and mechanical stress cross sensitivities are also evaluated. The suggested sensing device's advantages of considerable compactness, low manufacturing cost, simple fabrication technique, and higher sensitivity will be useful for future applications in the bio-chemical sensing and others.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据