COATING OPTICAL FIBRES WITH HYDROGEN-IMPERMEABLE MATERIAL

An optical fibre is coated with a hydrogen-impermeable material which is either a metal e.g. indium or tin, or a dielectric, e.g. silicon nitride, or possibly carbon by a CVD process as the fibre moves continuously through the deposition zone. The optical fibre may comprise a glass core and a claddi...

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Bibliographische Detailangaben
Hauptverfasser:	JOHN STEPHEN MCCORMACK, RONALD ALBERT EVANS, ADRIAN CLEMENT GREENHAM, BRUCE ARMSTRONG NICHOLS
Format:	Patent
Sprache:	eng
Schlagworte:	CHEMICAL COMPOSITION OF GLASSES, GLAZES, OR VITREOUSENAMELS CHEMICAL SURFACE TREATMENT CHEMISTRY COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY IONIMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING MATERIAL WITH METALLIC MATERIAL COATING METALLIC MATERIAL DIFFUSION TREATMENT OF METALLIC MATERIAL GLASS INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL JOINING GLASS TO GLASS OR OTHER MATERIALS METALLURGY MINERAL OR SLAG WOOL OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS OPTICS PHYSICS SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS,MINERALS OR SLAGS SURFACE TREATMENT OF GLASS SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION
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Beschreibung
Zusammenfassung:	An optical fibre is coated with a hydrogen-impermeable material which is either a metal e.g. indium or tin, or a dielectric, e.g. silicon nitride, or possibly carbon by a CVD process as the fibre moves continuously through the deposition zone. The optical fibre may comprise a glass core and a cladding layer made of a glass with a lower refractive index than that of the core, and the coated optical fibre may have a layer of abrasion resistant plastics material on the coating. In the drawing, as illustrated in the figure an optical fibre 6 is positioned along the longitudinal axis of an inner perforated silica tube 1 which is coaxially within an outer silica tube. Feed tubes 3 for the introduction of the different reactive constituents are arranged between the two silica tubes so as to allow the vapours to pass through the perforations in the inner tube 1 into the deposition zone where the optical fibre is positioned.