Suspended-core holey fiber for evanescent-field sensing

A simple fabrication technique for a silica suspended-core holey fiber design is presented that features a higher air-filling fraction than most holey fibers, making it ideal for evanescent-field-sensing applications. The holes in the fiber are defined through mechanical drilling of the preform, whi...

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Bibliographic Details
Published in:Optical Engineering 2007-01, Vol.46 (1), p.010503-010503
Main Authors: Webb, A. S, Poletti, F, Richardson, D. J, Sahu, J. K
Format: Article
Language:English
Subjects:
Acetylene
Approximation
Detection
Drilling
fiber optics
Fibers
Gas sensors
gases
optical fabrication
Preforms
sensors
silica
Stacking
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Summary:A simple fabrication technique for a silica suspended-core holey fiber design is presented that features a higher air-filling fraction than most holey fibers, making it ideal for evanescent-field-sensing applications. The holes in the fiber are defined through mechanical drilling of the preform, which is a significantly quicker and more straightforward approach to the customary stacking method. During the draw, the shape of the holes are manipulated so that the final fiber design approximates that of an air-suspended rod with three fine struts supporting the core. Modeling reveals that the modal overlap is greater than at for a core diameter of , which is significantly higher than any previously reported index-guiding structure used for sensing. A basic gas sensor is demonstrated using acetylene as the sensing medium and the results are reported.
ISSN:0091-3286
1560-2303
DOI:10.1117/1.2430505