Process for producing a low-attenuation optical fiber

C - Chemistry – Metallurgy – 03 – B

Patent

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C03B 37/014 (2006.01)

Patent

CA 2550673

A process for producing a low-attenuation optical fiber comprises producing a soot core preform (23) by chemical deposition on a substrate; removing the substrate from the soot core preform (23), thereby forming a central hole (26) along the soot preform (23); drying and consolidating the soot core preform (23) in a consolidation furnace (20) to form a glass core preform (23); heating the glass preform (23) in the consolidation furnace (20) over a glass melting temperature to produce a reduction of the diameter of the central hole (26); and stretching the glass core preform (23) to completely close the central hole.

L'invention concerne un procédé de production d'une fibre optique à faible atténuation, qui consiste à: produire une préforme à noyau de suie (23) par dépôt chimique sur un substrat; retirer le substrat de la préforme à noyau de suie (23) afin de former un trou central (26) dans l'axe de la préforme de suie (23); sécher et consolider la préforme de suie (23) dans un four de consolidation (20) afin de réaliser une préforme à noyau de verre (23); chauffer la préforme de verre (23) dans le four de consolidation (20) à une température supérieure à la température de fusion du verre afin de réaliser une réduction du diamètre du trou central (26); et étirer la préforme à noyau de verre (23) afin de fermer complètement le trou central.

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