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Proceedings Paper

Modified graded-index fibers for chemical sensing
Author(s): Miroslav Chomat; Vlastimil Matejec; Jiri Ctyroky; Ivan Kasik; Daniela Berkova; Milos Hayer; Zbynek Berka; Henri Gagnaire; Alain Trouillet
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Paper Abstract

Multimode optical fibers with inverted parabolic refractive- index profiles (IGI fibers) have been shown promising for the fabrication of sensing modules for evanescent-wave chemical detection. Besides IGI fibers with parabolic index profiles, this paper deals with theoretical and experimental investigation of some other types of IGI fibers, particularly with IGI fibers with linear and modified-linear profiles. Refractive-index profiles of the fabricated IGI preforms doped in the core with boron oxide are shown in the paper. The sensitivity of IGI fibers drawn from these preforms to cladding refractive-index changes has been studied by means of the technique of selective excitation of optical models in the fiber immersed in various mixtures of n-butanol and benzyl alcohol. The obtained results are compared with those for reference step-index fibers with uniform pure-silica core. A theoretical model describing the detection process during these measurements has been derived using geometrical optics. On this basis it can be shown that the fiber sensitivity increases in the order of the reference fiber, IGI fiber with linear and modified-linear profiles and IGI fibers with parabolic profiles.

Paper Details

Date Published: 29 December 1999
PDF: 6 pages
Proc. SPIE 4016, Photonics, Devices, and Systems, (29 December 1999); doi: 10.1117/12.373608
Show Author Affiliations
Miroslav Chomat, Institute of Radio Engineering and Electronics (Czech Republic)
Vlastimil Matejec, Institute of Radio Engineering and Electronics (Czech Republic)
Jiri Ctyroky, Institute of Radio Engineering and Electronics (Czech Republic)
Ivan Kasik, Institute of Radio Engineering and Electronics (Czech Republic)
Daniela Berkova, Institute of Radio Engineering and Electronics (Czech Republic)
Milos Hayer, Institute of Radio Engineering and Electronics (Czech Republic)
Zbynek Berka, Institute of Radio Engineering and Electronics (Czech Republic)
Henri Gagnaire, Univ. Jean Monnet (France)
Alain Trouillet, Univ. Jean Monnet (France)


Published in SPIE Proceedings Vol. 4016:
Photonics, Devices, and Systems
Miroslav Hrabovsky; Pavel Tomanek; Miroslav Miler, Editor(s)

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