Apparatus for vitrifying soot preform for optical fiber

Details Apparatus for vitrifying soot preform for optical fiber Apparatus for vitrifying soot preform for optical fiber

1994-06-08

1996-05-07

Bennett, Henry A.

Heating

Work chamber having heating means

Work chamber having gaseous material supply or removal...

432124, 432128, 432163, 432167, 432200, 432207, F27B 504

Patent

active

055139833

ABSTRACT:
An apparatus for vitrifying a soot preform from which an optical fiber is produced by drawing, is composed of a main vacuum chamber 20 in which a muffle tube 70 for vitrifying the soot preform PF is located, and an auxiliary vacuum chamber 30 mounted on the main vacuum chamber 20 and communicated therewith through a passage, and a gate valve 60 for opening and closing the passage. The muffle tube 70 has a inner surface covered with silicon carbide layer 70a.

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