发明名称 |
Method of fabricating multi-mode optical fiber preforms |
摘要 |
A method of fabricating an optical fiber preform wherein a synthesizing torch is inclined between 10 DEG and 60 DEG with respect to the rotation axis of a seed rod. Moving the rod while rotating it, a glass raw material gas and a flame forming gas are blown out individually from the torch to synthesize glass particles which are deposited onto one end of the rod, so that a cylindrical porous preform is grown in the direction of the rotation axis of the rod. Then the porous preform is heated at a high temperature to vitrify the porous preform into a transparent optical fiber preform. At least one exhaust port is disposed at a distance of 1 mm to 50 mm from the periphery of the porous preform and in the vicinity of the growing surface of the porous preform. In fabricating the porous preform the outer diameter fluctuations are small, and the preform is formed stably without formation of cracking on the periphery of the preform.
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申请公布号 |
US4367085(A) |
申请公布日期 |
1983.01.04 |
申请号 |
US19800188916 |
申请日期 |
1980.09.19 |
申请人 |
NIPPON TELEGRAPH & TELEPHONE PUBLIC CORPORATION |
发明人 |
SUTO, SHOICHI;HANAWA, FUMIAKI;KAWACHI, MASAO;EDAHIRO, TAKAO;NAKAHARA, MOTOHIRO |
分类号 |
C03B37/014;(IPC1-7):C03B19/06;C03B37/07 |
主分类号 |
C03B37/014 |
代理机构 |
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代理人 |
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主权项 |
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