Patent No. EP4030204 (titled "Microstructured Optical Fibre And Preform For Same") was filed by Heraeus Quarzglas on Jan 19, 2021. The application was issued on Sep 20, 2023.
A microstructured optical fiber with a hollow core that achieves low-loss transmission through the elimination of moisture and chlorine impurities. The fiber features a synthetic quartz glass preform with oxygen deficiency centers specifically created in the wall material, which actively react with moisture to eliminate it. The oxygen deficiency centers absorb light in the UV range, while the glass network structure absorbs light in the visible and near-infrared spectrum. The fiber's hollow core and antiresonance structure guide light through the hollow core, enabling high-field area transmission.

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