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1. 发明公开

EP1808419A1 PROCESS FOR PRODUCING OPTICAL FIBER PREFORM 审中-公开
标题翻译： VERFAHREN ZUR HERSTELLUNG EINER LICHTLEITFASERVORFORM
公开(公告)号：EP1808419A1
公开(公告)日：2007-07-18
申请号：EP05795596.5
申请日：2005-10-20
申请人： Sumitomo Electric Industries, Ltd.
发明人： NAKANISHI,T.,Yokohama Works Sumitomo El. Ind. Ltd. , HIRANO,M.,Yokohama Works Sumitomo El. Ind. Ltd.
IPC分类号： C03B37/018
CPC分类号： C03B37/01823 , C03B2207/66 , Y02P40/57
摘要： The present invention provides a method for producing an optical fiber preform, in which method it is possible to synthesize and deposit glass at a high rate by the inside CVD method using a plasma burner as a heat source in a manner such that unconsolidated portions or bubbles are little generated in the optical fiber preform. The method includes a step of depositing a glass film on the inner wall surface of a starting pipe, the wall thickness of which is d (mm), by heating from the outer circumferential surface of the pipe while a gas containing a glass raw material is introduced into the pipe, the plasma burner being moved in parallel with the axis of the pipe, wherein in a first embodiment, the temperature is controlled not to exceed (1800 + 100×d)°C, a temperature of (1100 + 100×d)°C or higher being continued for 20 seconds or more at each point of the starting pipe. In a second embodiment of the invention, the plasma burner includes at least two inlets for gases for forming plasma and has an inner diameter of 80 mm or more (sectional area S) in a region where the plasma is formed, and the deposition step is performed in a manner to satisfy the relationship, 150 mm/second
摘要翻译：本发明提供一种光纤预制棒的制造方法，其中通过使用等离子体燃烧器作为热源的内部CVD法可以以高速合成和沉积玻璃的方法，使得未固结的部分或气泡在光纤预制件中几乎没有产生。该方法包括通过从管的外周面加热而将玻璃膜沉积在起始管的内壁面上，其壁厚为d（mm），同时含有玻璃原料的气体为引入到管中，等离子体燃烧器与管的轴线平行移动，其中在第一实施例中，温度控制不超过（1800 + 100×d）℃，温度为（1100 + 100× d）℃以上在起始管的每一点持续20秒以上。在本发明的第二实施例中，等离子体燃烧器包括用于形成等离子体的气体的至少两个入口，并且在形成等离子体的区域中具有80mm以上的内径（截面积S），并且沉积步骤为以满足关系的方式进行，150mm /秒

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