Abstract

Fictive temperature $(T_{f})$ of pure silica cores was determined for a series of polymer-clad optical fibers via reflectance FTIR spectroscopy. The core diameters of the studied fibers were in the range 125–1500 $\mu$m. The fictive temperature was found to decrease gradually with increasing core diameter, which correlates with the anticipated fiber cooling rate. For a 1500 $\mu$m fiber, the radial distribution of the fictive temperature was examined. No dependence of $T_{f}$ was observed upon the distance from the fiber axis, indicating that the heat conduction inside the silica fiber was much faster than the heat convection away from its surface, even for fibers with diameters greater than 125 $\mu$m.

© 2011 IEEE

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