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Very-low-OH-content optical fibres consisting of borosilicate-cladding phosphosilicate-core have been produced by a chemical vapour deposition technique. One of the fibres, whose transmission loss was less than 1 dB/km between 0.95 and 1.37 μm, showed a minimum loss of 0.47 dB/km at 1.2 μm.
Horiguchi et al. (1976) studied this question.
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