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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Vol. 19, Iss. 8 — Aug. 1, 2002
  • pp: 1759–1765

Formation of thermally stable chemical composition gratings in optical fibers

Michael Fokine  »View Author Affiliations


JOSA B, Vol. 19, Issue 8, pp. 1759-1765 (2002)
http://dx.doi.org/10.1364/JOSAB.19.001759


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Abstract

Experimental results and a discussion of possible chemical pathways in the formation of thermally stable chemical composition gratings in optical fibers are presented. Gratings are formed through high-temperature treatment of UV-exposed hydrogen-loaded fibers. The final refractive-index modulation is ascribed to variations in fluorine concentration attained by periodically increased diffusion of fluorine. The mechanism behind this increase is the formation of mobile hydrogen fluoride from chemical reactions of fluorine and UV-induced hydroxyl, which occur with the spatial periodicity of the UV pattern. A hydroxyl-assisted increase in fluorine diffusion has been verified by time-of-flight secondary-ion mass spectroscopy. Formation of ultrastable grating by periodic variation of oxygen concentration through diffusion of molecular water is also discussed.

© 2002 Optical Society of America

OCIS Codes
(060.2290) Fiber optics and optical communications : Fiber materials
(060.2310) Fiber optics and optical communications : Fiber optics
(230.1480) Optical devices : Bragg reflectors

Citation
Michael Fokine, "Formation of thermally stable chemical composition gratings in optical fibers," J. Opt. Soc. Am. B 19, 1759-1765 (2002)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-19-8-1759


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