REACTION CHAMBER AND METHOD FOR PREPARING PREFORMS FOR OPTICAL FIBERS

摘要

The invention concerns a reaction chamber comprising a first container (1), a second container (4) connected to a conduit (6), an outer tube (3) emerging into the container (1), an outer tube (8) emerging into the conduit. The container (1) is designed to receive a sleeve glass, and the container (4) a core glass for optical fiber. The method for using said chamber, after vacuum sealing in (3a) and (8a), and heating the chamber at a sufficient temperature for melting the glasses, the chamber being in the position represented with the tube (3) in vertical position, consists: in a 180 DEG anti-clockwise rotation about an axis perpendicular to the figure. The sleeve glass flows into the tube (3) while the core glass remains confined in the container (4); cooling the tube (3), then returning to the original position; part of the sleeve glass, maintained in liquid form in the center of the tube (3), drops into the container (1); carrying out another 180 DEG rotation, but clockwise. The core glass flows into the conduit (6) and drops by gravity into the empty central part of the tube (3), while the sleeve glass which has dropped again into the tube (3) and has cooled, remains congealed on the wall of the container (1). The invention thus enables preparation, in a vacuum sealed chamber containing the two glasses, a preform for optical fiber.