Increased sensitivity and parametric discrimination using higher order modes of etched-core fiber Bragg grating sensors

被引：28
|
作者：
Chryssis, AN [1 ]
Saini, SS [1 ]
Lee, SM [1 ]
Dagenais, M [1 ]
机构：
[1] Univ Maryland, Dept Elect & Comp Engn, College Pk, MD 20742 USA
来源：
IEEE PHOTONICS TECHNOLOGY LETTERS | 2006年 / 18卷 / 1-4期
关键词：
biological sensor; chemical sensor; evanescent field; fiber Bragg grating (FBG);
D O I：
10.1109/LPT.2005.861628
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
The sensitivity of an etched-core fiber Bragg grating sensor to a change of the surrounding medium index can be significantly increased by measuring the higher order modes. The sensitivity of the third-order mode is increased by at least a factor of six as compared to that of the fundamental mode for a fiber etched down to a core diameter of 5 mu m. The change of the Bragg wavelength for the higher order modes is the same as that for the fundamental mode in a situation when only the physical properties of the fiber, such as the core index and the grating period, are altered, which is not the case when the index of the surrounding medium is changed.
引用
收藏
页码：178 / 180
页数：3
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