Method of manufacturing optical fiber preform

C - Chemistry – Metallurgy – 03 – B

Patent

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C03B 37/012 (2006.01)

Patent

CA 2088238

The present invention provides a method of manufacturing an optical fiber preform having the steps of disposing a rod member made of a silica-based material within a cavity of a mold, followed by loading a molding material within the mold cavity, and applying pressure to the mold from the outside to form a porous layer on the surface of the rod member and, thus, to obtain a porous preform, wherein at least one end portion of the rod member extends outside the mold cavity in the step of applying pressure to the mold. The particular method permits manufacturing a high quality porous preform free from splits or cracks, making it possible to obtain a high quality optical fiber preform free from residual bubbles.

La présente invention porte sur une méthode pour fabriquer une préforme de fibre optique comportant les étapes suivantes: placer une tige faite d'un matériau à base de silice dans la cavité d'un moule, puis introduire un matériau de moulage dans la cavité du moule et appliquer une pression sur le moule de l'extérieur de manière à former une couche poreuse à la surface de la tige et, ainsi, obtenir une préforme poreuse, la méthode prévoyant qu'au moins une extrémité de la tige s'étende à l'extérieur de la cavité du moule à l'étape de l'application d'une pression sur le moule. Cette méthode permet la fabrication d'une préforme poreuse de grande qualité, exempte de fissures, ce qui rend possible l'obtention d'une préforme de fibre optique de grande qualité, exempte de bulles résiduelles.

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