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Glasses in the SiO2/GeO2/F/P2O5 system have been investigated as materials for core and cladding of multimode and single-mode fibres, and the possibility of using F-doping whilst achieving low attenuation in the 1- 1.8 μm region established. Minimum values of 0.28 dB km and 0.23 dB km have been observed in single-mode and multimode fibres, respectively.
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Irven et al. (1981) studied this question.
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