| 摘要 |
<p>The invention relates to a device for drawing optical fibres from a preform, comprising: a furnace (3) comprising a tube for heating one end of said preform to the drawing temperature thereof, which tube comprises: i) a central tube (10), ii) an upper extension tube (5) connected to the lower part of said central tube (10) so as to obtain a gas tight seal against an ambient atmosphere exterior said furnace, wherein the upper extension tube (5) comprises an inlet (8) for an inert gas in the top region of the upper extension tube (5), as a result of which the preform (2) and the fibre (9) to be drawn therefrom are surrounded by an inert gas, iii) a lower extension tube (6) connected to said upper extension tube (5) in such a manner that a gas tight seal against an ambient atmosphere exterior said furnace is obtained, iv) a tube outlet (7) connected to said lower extension tube (6), means for drawing the fibre, means for supporting the preform in the furnace. The tube outlet (7) is conical and comprises a number of outlet openings (12) for the inert gas. A method of drawing optical fibres from a preform using said device is also claimed. <IMAGE></p> |
