Hydroxyl ion absorption is the absorption in optical fibers of electromagnetic radiation, including the near-infrared, due to the presence of trapped hydroxyl ions remaining from water as a contaminant.^[1]

The hydroxyl (OH⁻) ion can penetrate glass during or after product fabrication, resulting in significant attenuation of discrete optical wavelengths, e.g., centred at 1.383 μm, used for communications via optical fibres.^[2]

1. ^ "Hydroxyl Ion Absorption". Timbercon. Retrieved 16 September 2024.
2. ^ Wu, Lue; Gao, Maodong; Liu, Jin-Yu; Chen, Hao-Jing; Colburn, Kellan; Blauvelt, Henry A.; Vahala, Kerry J. (1 July 2023). "Hydroxyl ion absorption in on-chip high-Q resonators". Optics Letters. 48 (13): 3511. arXiv:2303.17814. doi:10.1364/OL.492067. ISSN 0146-9592.

 This article incorporates public domain material from Federal Standard 1037C. General Services Administration. Archived from the original on 22 January 2022.

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