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Proceedings Paper

Photosensitivity in optical fibers: detection, characterization, and application to the fabrication of in-core fiber index gratings
Author(s): Bernard Malo; Francois Bilodeau; Derwyn C. Johnson; Iain M. Skinner; Kenneth O. Hill; Theodore F. Morse; Arnd Kilian; Lawrence J. Reinhart; Kyunghwan Oh
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Paper Abstract

The irradiation of optical fibers by intense optical fields from visible or ultraviolet laser sources creates color centers within the glass fiber. Such laser light irradiation usually has the detrimental effect of increasing the transmission loss of the optical fibers particularly in the visible spectral region. A concomitant effect of the light irradiation is that the refractive index of the glass is permanently changed even at wavelengths much longer than the wavelength of the irradiating light. This latter effect termed fiber photosensitivity is beneficial in that it provides a versatile means for fabricating periodic index gratings in the cores of optical fibers. Since the physical processes underlying fiber photosensitivity are not well understood, a purpose of this paper is demonstrate the importance of the phenomena in order to stimulate further research on the origin of the effect and developing new photosensitive fiber materials. The paper reviews briefly the phenomena of photosensitivity in glass fibers with germanium dopant in the fiber core. The methods used for detecting and characterizing fiber photosensitivity are applied to a new photosensitive fiber - Eu2+:A1203 - doped - core fiber. This fiber was manufactured at Brown University using MCVD with a novel aerosol delivery system for the transport of low pressure precursors. This is the first fiber reported that is free of germanium dopant and also exhibits fiber photosensitivity.

Paper Details

Date Published: 1 November 1991
PDF: 11 pages
Proc. SPIE 1590, Submolecular Glass Chemistry and Physics, (1 November 1991); doi: 10.1117/12.50203
Show Author Affiliations
Bernard Malo, Communications Research Ctr. (Canada)
Francois Bilodeau, Communications Research Ctr. (Canada)
Derwyn C. Johnson, Communications Research Ctr. (Canada)
Iain M. Skinner, Communications Research Ctr. (Canada)
Kenneth O. Hill, Communications Research Ctr. (Canada)
Theodore F. Morse, Brown Univ. (United States)
Arnd Kilian, Brown Univ. (United States)
Lawrence J. Reinhart, Brown Univ. (United States)
Kyunghwan Oh, Brown Univ. (United States)

Published in SPIE Proceedings Vol. 1590:
Submolecular Glass Chemistry and Physics
Phillip Bray; Norbert J. Kreidl, Editor(s)

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