Spatial optical filter sensor based on hollow-core silica tube

被引：10

作者：

Ferreira, Marta S. ^{[1
,2
]}

Schuster, Kay ^{[3
]}

Kobelke, Jens ^{[3
]}

Santos, Jose L. ^{[1
,2
]}

Frazao, Orlando ^{[1
]}

机构：

[1] INESC Porto, P-4169007 Oporto, Portugal

[2] Univ Porto, Fac Ciencias, P-4169007 Oporto, Portugal

[3] Inst Photon Technol Jena, D-07745 Jena, Germany

来源：

OPTICS LETTERS | 2012年 / 37卷 / 05期

关键词：

FIBER; INTERFEROMETER; COUPLERS;

D O I：

10.1364/OL.37.000890

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

A spatial optical filter based on a hollow-core silica tube is proposed. Because of the hollow-core dimensions, it is possible to obtain a periodical spatial filter ranging from 1200 to 1700 nm with a channel spacing of 2.64 THz. The bandwidth is approximately 5.32 nm, and the isolation loss is similar to 30 dB. The optical losses are approximately similar to 0.67 dB/mm for a wavelength of 1500 nm. The 40 mm long spatial optical filter is tested as a sensing element and subjected to different physical parameters. The spatial optical filter is wavelength sensitive to strain and temperature, while for refractive-index variations there is an optical power dependency. This fiber structure can be used as a sensing element for extreme conditions, such as in very high temperature environments, where it presents a sensitivity of 27.5 pm degrees C-1. (C) 2012 Optical Society of America

引用

页码：890 / 892

页数：3

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