Fiber-optic refractive-index sensors based on transmissive and reflective thin-core fiber modal interferometers
Fiber-optic refractive-index sensors based on transmissive and reflective thin-core fiber modal interferometers
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DOI：
10.1016/j.optcom.2010.01.031
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发表时间：
2010-05-15
影响因子：
2.4
通讯作者：
Zhu, Jing-Jing
中科院分区：
文献类型：
--
作者：
Xia, Tian-Hao;Zhang, A. Ping;Zhu, Jing-Jing
提出了一种基于光纤模式干涉仪的新型光纤折射率传感器，该光纤模式干涉仪由一根截止波长比普通单模光纤短三倍的细芯光纤构成。在这样的芯直径失配结构中，高阶包层模式被有效地激发并且与芯模式干涉以形成高折射率滤波器（>30 dB）。实验证明了透射式和反射式薄芯光纤模式干涉仪，并且对外部折射率的微小变化（>100 nm/R.I.U.）表现出高灵敏度，但对温度变化的敏感性低（
We present a new fiber-optic refractive-index sensor based on a fiber modal interferometer constituted by a thin-core optical fiber, whose cut-off wavelength is around three times shorter than normal single-mode fiber. In such a core diameter mismatching structure, the high-order cladding modes are efficiently excited and interfere with the core mode to form a high extinction-ratio filter (>30 dB). Both transmissive and reflective thin-core fiber modal interferometers are experimentally demonstrated, and show a high sensitivity to a small change of external refractive-index (>100 nm/R.I.U.), but a low sensitivity to the change of temperature (