Nanodeposition of materials with complex refractive index in long-period fiber gratings

被引：73
|
作者：
Del Villar, I [1 ]
Matias, IR [1 ]
Arregui, FJ [1 ]
Achaerandio, M [1 ]
机构：
[1] Univ Publ Navarra, Elect & Elect Engn Dept, Pamplona 31006, Spain
来源：
JOURNAL OF LIGHTWAVE TECHNOLOGY | 2005年 / 23卷 / 12期
关键词：
coupled-mode analysis; long-period gratings; nanodeposition; optical fiber sensors; refractive index;
D O I：
10.1109/JLT.2005.858246
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：
An overlay of higher refractive index than the cladding is deposited on a long-period fiber grating (LPFG). This causes large attenuation-band shifts in the transmission spectrum, which permits the improvement of the sensitivity of the device to ambient and overlay refractive-index changes. To obtain maximum sensitivity for specific overlay and ambient refractive indexes, an optimum overlay thickness (OOT) must be selected. For complex overlay refractive indexes, there is an additional phenomenon of vanishing of the attenuation bands. This occurs for specific overlay-thickness values. The problem is analyzed with a numerical method based on linearly polarized (LP)-mode approximation and coupled-mode theory. Experimental results are contrasted with theoretical ones.
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页码：4192 / 4199
页数：8
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