Method and apparatus for producing preform for optical fibers

摘要

An apparatus for producing a preform is described comprising a chamber (1) in which the soot preform (3) is placed and a burner (2) which has a plurality of sections partitioned by a plurality of pipes differing in diameter. It additionally has a flow rate controller (8) which controls the flow rate of an inert gas fed to the central section of the burner (2), a pyrometer (6) which detects the light emitted from the chamber (1) to the outside to measure the temperature of the soot preform (3), and a computer (7) which is connected to the pyrometer (6) and controls the flow rate controller (8) based on the temperature of the soot preform (3). $$