| 摘要 |
<p>An apparatus is described for vitrifying a soot preform (PF), from which an optical fiber is produced by drawing which comprises a main vacuum chamber (20) in which a muffle tube (70) for vitrifying the soot preform (PF) is located surrounded by a heater system (80), and an auxiliary vacuum chamber (30) mounted on the main vacuum chamber (20) and communicating therewith through a passage (21), and a gate valve (60) for opening and closing the passage (21). The muffle tube (70) has a inner surface covered with silicon carbide layer. The apparatus also comprises a device (300) for supporting and rotating the preform and for transferring the preform between the two chambers (20,30). <IMAGE></p> |
