TIA's Glossary of Telecommunication Terms
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hydroxyl ion absorption
In optical fibers, the absorption of electromagnetic waves, including the near-infrared, due to the presence of trapped hydroxyl ions remaining from water as a contaminant. Note: The hydroxyl (OH-) ion can penetrate glass during or after product fabrication, resulting in significant attenuation of discrete optical wavelengths, e.g. , approximately 1.3 
m, used for communications via optical fibers.