TED-AJ03-115 FEASIBLE DOMAIN OF HIGH SPEED OPTICAL FIBER DRAWING

概要

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The domain of operating conditions in which the drawing process is successful, is an important consideration. Such a domain is basically determined by the stresses acting on the fiber and the stability of the process. The work presented in this paper considers feasible configurations of a fiber drawing system. It is shown that only certain combinations of furnace temperature and draw speed result in feasible fiber drawing. It is also shown that the heat-zone length, as another important parameter, can also be varied to obtain other feasible domains. Several improvements had to be made in the numerical scheme in order to locate the boundary of the feasible drawing domain. Physical behavior close to the boundary of a feasible domain is next studied. It is found the iteration diverges more rapidly when the draw temperature is lower and beyond the acceptable domain due to the lack of material flow. However the divergence rate becomes such less when the temperature gets close to the domain boundary. This observation implies that it is very expensive to locate the exact boundary of the feasible drawing domain. From the results obtained, along with practical considerations of material rupture, defect concentration and flow instability, an optimum design of a fiber drawing system can also be determined for the best fiber quality.
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