The increase in attenuation due to POH and GeOH formation, when fibres are exposed to hydrogen, has been found to follow a log (time) relation. Results are given for fibres with different phosphorus content. A possible explanation for the log t behaviour is discussed and, using the relationship, a prediction of long-term attenuation rise is made. The rise thus predicted is very small for current low-phosphorus fibres.
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Plessner et al. (1984) studied this question.
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