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Spectral changes of ESR signals due to germanium associated Ge(3) centres were observed on heat-treated optical fibres and preforms. The defect centres essentially exist in as-drawn fibres, even if preforms have been oxidised prior to drawing. The 500?C heat treatment of Ge-doped fibres caused a remarkable decrease in the ESR intensity of Ge(3) centres, subsequently causing optical loss increase around...
Loss-increase characteristics for four kinds of silicone-coated optical fibres with heat treatment have been investigated OH ion absorption loss increase occurs by heat treatment above 250?C, and becomes marked in heat treatment at 500?C for GeO2-doped silica fibres. The others did not exhibit any loss increase at 1.39 ?m due to OH ions. It was found, from the experiments, that the loss-increase characteristics...
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