Abstract
Intrinsic crystallisation is invoked at each process stage during the manufacture of fluoride glass fibers. Thermal history and crystallisation distributions were calculated by numerical simulation of the entire fibre manufacturing process, from the preform to fibre drawing. Assuming a gaussian field distribution for single-mode fibre, the attenuation due to crystallisation was calculated using classical scattering theory. Results show strong dependence on the temperature of the core melt and fibre drawing conditions. The former can be reduced to acceptable levels under normal manufacturing conditions. During fibre manufacture it is necessary to maximise both fibre tension and speed in order to reduce additional attenuation to a level below that of Rayleigh scattering.
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