Method of fabricating a cylindrical optical fiber containing...

C - Chemistry – Metallurgy – 03 – B

Patent

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Details

C03B 37/012 (2006.01) C03B 37/026 (2006.01) C03B 37/027 (2006.01) C03C 25/10 (2006.01) C03C 25/42 (2006.01) C03C 25/46 (2006.01) C03C 25/52 (2006.01) G02B 6/02 (2006.01)

Patent

CA 2336007

A method of forming a preform which has a glass core (10) surrounded by an outer glass cladding (16) with a coating (18) of an optically active material disposed between the core (10) and cladding (16). The method includes providing a glass core (10) having a viscosity which lies within a given preselected temperature range, followed by forming a substantially homogeneous coating (18) of an optically active material over the surface of the core, with the coating having a viscosity which is equal to or less than the viscosity of the glass core. A glass cladding (16) is formed over the coated layer (18), with the cladding (16) having a viscosity which overlaps the viscosity of the core glass (10) and a thermal coefficent of expansion compatible with that of the core. The optically active material is an inorganic material which includes a metal, metal alloy, ferrite, magnetic material or a semiconductor. The invention includes the product formed by the process.

L'invention concerne un procédé de formation d'une préforme qui possède un noyau en verre (10) entouré d'une enveloppe externe en verre (16) et d'un revêtement (18) fait avec une substance opto-active disposée entre le noyau (10) et l'enveloppe (16). Le procédé consiste à fournir un noyau en verre (10) possédant une viscosité qui correspond à une plage de températures prédéterminée puis à former un revêtement sensiblement homogène (18) en un matériau opto-actif sur la surface du noyau, le revêtement possédant une viscosité inférieure ou égale à celle du noyau en verre. Une enveloppe en verre (16) est formée par-dessus la couche à revêtement (18), ladite enveloppe possédant une viscosité qui recoupe celle du noyau en verre (10) et un coefficient d'expansion thermique compatible avec celui du noyau. La substance opto-active est une substance inorganique qui comprend un métal, un alliage métallique, une ferrite, un matériau magnétique ou semi-conducteur. L'invention concerne également le produit formé par ce procédé.

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