Multiplexing of fiber-optic long-period grating-based interferometric sensors

被引：39
|
作者：
Murphy, Richard P. [1 ]
James, Stephen W. [1 ]
Tatam, Ralph P. [1 ]
机构：
[1] Cranfield Univ, Engn Photon Grp, Sch Engn, Cranfield MK43 0AL, Beds, England
来源：
JOURNAL OF LIGHTWAVE TECHNOLOGY | 2007年 / 25卷 / 03期
基金：
英国工程与自然科学研究理事会;
关键词：
multiplexing; optical-fiber long-period gratings (LPGs); sensors;
D O I：
10.1109/JLT.2006.889670
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：
Two long-period gratings (LPGs) fabricated in series in an optical fiber form a Mach-Zehnder interferometer, producing a sinusoidal channelled spectrum within the characteristic LPG attenuation bands, which has the appearance of an interference fringe pattern. The phase of the fringes is sensitive to changes in the surrounding environmental parameters, such as refractive index. Fabrication of a number of identical cascaded LPG pairs with different separations produces independent fringe patterns of different frequencies within the attenuation bands. The application of basic Fourier techniques to analyze the transmission spectrum allows the phase of each fringe pattern to be determined independently, facilitating the differentiation of external effects acting on each interferometer.
引用
收藏
页码：825 / 829
页数：5
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