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Transmission loss of VAD single mode fibres has been reduced to 0.35 dB/km at 1.3 μm and 0.2 dB/km at 1.55 μm by the thick cladding deposition and dehydration technique. The residual OH absorption loss is only 0.1 dB/km at 1.39 μm.
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Tomaru et al. (1981) studied this question.
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