Verfahren zur Herstellung einer Vorform aus Glas für optische Fasern

Details

Veröffentlichungs-Nr.

EP2484644

Aktenzeichen

EP12153445

Anmeldetag

1. Februar 2012

Veröffentlichung

23. Oktober 2013

Erteilung

23. Oktober 2013

Rechtsraum

EP

IPC

C03B37/018C03B37/012

Abstract

A method for producing an optical fiber preform according to the present invention includes a collapse step of collapsing a silica-based glass tube by heating with a heat source continuously traversed in the longitudinal direction of the glass tube to form a first glass rod to be formed into a core part or part of a core part of an optical fiber, the glass tube having an inner surface doped with an alkali metal, in which the glass tube has a maximum alkali metal concentration of 500 to 20,000 atomic ppm, a maximum chlorine concentration of 0 to 1000 atomic ppm, and a maximum fluorine concentration of 0 to 10,000 atomic ppm, and in which in the collapse step, the maximum temperature of the outer surface of the glass tube is 2000°C to 2250°C, and the traverse speed of the heat source is 30 mm/min to 100 mm/min.

Anmelder

Firma

Sumitomo Electric Industries, Ltd.

Land

🇯🇵 Japan

Fachgebiete