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Fluorine’s effect on fiber optical losses induced by drawing

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Abstract

Fiber optical losses approaching the ultimately low level are determined mainly by drawing conditions, in particular, by the three interconnected parameters of temperature, speed, and tension, and they also depend on the glass composition. For silica-germanium fibers it was found that germanium-induced losses (UV absorption and Rayleigh scattering) grow with higher temperatures and with lower drawing tensions.12 Yet, for fibers with a pure silica core and a fluorine-doped reflecting cladding the dependence was quite the opposite; namely, Rayleigh scattering grew with increasing drawing tension.3 We have investigated the influence of drawing conditions on the optical losses of silica-germanium fibers, the cores of which are additionally doped by fluorine, and we have shown the possibility of making the losses much less dependent on the drawing temperature and of reducing them to some extent, particularly for the fibers with the higher content of germanium.

© 1994 Optical Society of America

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