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29 December 1999 Modified graded-index fibers for chemical sensing
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Proceedings Volume 4016, Photonics, Devices, and Systems; (1999)
Event: Photonics Prague '99, 1999, Prague, Czech Republic
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.
© (1999) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Miroslav Chomat, Vlastimil Matejec, Jiri Ctyroky, Ivan Kasik, Daniela Berkova, Milos Hayer, Zbynek Berka, Henri Gagnaire, and Alain Trouillet "Modified graded-index fibers for chemical sensing", Proc. SPIE 4016, Photonics, Devices, and Systems, (29 December 1999);

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