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Proceedings Paper

Dielectric annular core fiber for optical sensing
Author(s): Petr Solarik; Zdenek Burian; Ivan Kasik; Vlastimil Matejec; Jan Mrazek; Milos Hayer
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Paper Abstract

The paper deals with a special type of sensing optical fiber, the annular core fiber. This fiber is composed of a narrow annular low-loss glass optical core and glass optical cladding which are applied onto the inner wall of a silica capillary. In the paper transmission characteristics are determined theoretically from the solution of the Helmholtz equation as well as experimentally from measurements of the near field and angular distributions of the output power from the fiber excited by an inclined collimated beam. The sensitivity of the fiber to gaseous toluene is determined under the excitation of the fiber by an inclined beam at 670 nm, when refractive-index changes in the evanescent field are responsible for the sensitivity. These measurements are compared with those carried out with reference capillary silica fibers and PCS fibers. It is shown that the annular core fibers have the highest sensitivity in comparison with the reference fibers. A detection limit of 0.06 % can be determined from the sensitivity measurements.

Paper Details

Date Published: 22 April 2006
PDF: 10 pages
Proc. SPIE 6189, Optical Sensing II, 61891R (22 April 2006); doi: 10.1117/12.662286
Show Author Affiliations
Petr Solarik, Czech Technical Univ. in Prague (Czech Republic)
Zdenek Burian, Czech Technical Univ. in Prague (Czech Republic)
Ivan Kasik, Institute of Radio Engineering and Electronics (Czech Republic)
Vlastimil Matejec, Institute of Radio Engineering and Electronics (Czech Republic)
Jan Mrazek, Institute of Radio Engineering and Electronics (Czech Republic)
Milos Hayer, Institute of Radio Engineering and Electronics (Czech Republic)


Published in SPIE Proceedings Vol. 6189:
Optical Sensing II
Brian Culshaw; Anna G. Mignani; Hartmut Bartelt; Leszek R. Jaroszewicz, Editor(s)

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