Abstract
A strong axial tension increase induced by UV laser radiation is observed in the cores of single-mode optical fibers containing Bragg gratings, independently of the initial core stress. The induced index modulation of the gratings is linearly correlated to stress changes with a slope of (0.8 ± 0.2) × 10−4 mm2/kg. The phenomenon can be explained by a structural change of the glass in the fiber core into a more compact configuration.
© 1995 Optical Society of America
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