A method for producing cladded preforms (composite rods) composed of high-purity soda-lime-silica glasses is described. Optical-attenuation measurements have been made on cladded fibres produced from such a preform over the wavelength region 600–1100 nm. Results indicate that the incremental loss in producing a fibre by this technique is very small, and is mainly due to scatter.
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Stewart et al. (1974) studied this question.