发明名称 |
OPTICAL FIBER DRAWING METHOD AND DRAWING DEVICE |
摘要 |
<p>A drawing apparatus 1 has a drawing furnace 11 for heating and drawing an optical fiber preform 2, and a carbon heater 13 is disposed in this drawing furnace 11. The carbon heater 13 has a heating portion the length of which in a drawing direction is set to not less than 280 mm. The carbon heater 13 heats the preform so that a maximum temperature on the surface of the optical fiber preform 2 in the drawing furnace 11 becomes below 1800 DEG C. The optical fiber preform 2 is drawn in a state in which the temperature of the muffle tube 12 of the drawing furnace 11 is kept below 1800 DEG C, so that atomic arrangement in the optical fiber preform 2 becomes relatively aligned in a state of reduced randomness of atomic arrangement. This permits the optical fiber 3 to be drawn as reflecting the reduced randomness state of atomic arrangement, whereby the optical fiber 3 can be obtained with reduced Rayleigh scattering intensity and lowered transmission loss. <IMAGE></p> |
申请公布号 |
EP1211228(A1) |
申请公布日期 |
2002.06.05 |
申请号 |
EP20000942422 |
申请日期 |
2000.06.30 |
申请人 |
SUMITOMO ELECTRIC INDUSTRIES, LTD. |
发明人 |
ISHIHARA, TOMOHIRO;SAITO, TATSUHIKO;OHGA, YUICHI |
分类号 |
C03B37/027;C03B37/029;G02B6/00;(IPC1-7):C03B37/027 |
主分类号 |
C03B37/027 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|