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The dehydration effect of SOCl2 on v.a.d. optical-fibre preforms has been investigated. The OH content of the graded-index fibres obtained was reduced to the level of 0.05 p.p.m. (the lowest value was 0.03 p.p.m.), resulting in the minimum loss of 0.60 dB/km at 1.3 μm.
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Edahiro et al. (1979) studied this question.
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