Water-free pure-silica-core fibre has been developed for the first time. It exhibits ultra-low loss of 0.247 dB/km at 1383 nm and 0.170 dB/km at 1550 nm, representing the lowest-loss G.652D fibre. Excellent durability against hydrogen ageing owing to pure-silica-core has also been verified.
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Yamamoto et al. (2004) studied this question.
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