Method of fabricating a preform and optical fiber

专利名称：Method of fabricating a preform and optical

fiber

发明人：Ishida, Yoshinori申请号：EP01308881.0申请日：20011019公开号：EP1215179A2公开日：20020619

专利附图：

摘要：Methods of fabricating an optical fiber preform and a method of fabricating anoptical fiber of the invention realize the fabrication of an optical fiber having desirabletransmission characteristics in the entire wavelength rage of about 1.3 to 1.6 µm. The

fabrication method comprisses a porous core rod producing step of depositing a firstcladding (3) having an outer diameter D so as to surround a core (2) having an outerdiameter d to produce a porous core rod (1) of D/d ≥ 4.0 by VAD. Then, the porous corerod (1) is dehydrated to reduce the OH group concentration to 0.8 ppb or less by weightratio. The porous core rod (1) is formed to be transparent for a vitrified core rod (4) andis heated and stretched. Thereafter, a second cladding is obtained by depositing a secondporous cladding (5) around the vitrified core rod (4) by VAD to be dehydrated,

transparent and vitrified. The optical fiber preform thus fabricated is drawn to form intoan optical fiber and is then allowed to stand in a deuterium gas atmosphere for apredetermined period.

申请人：The Furukawa Electric Co., Ltd.

地址：6-1, Marunouchi 2-chome, Chiyoda-ku Tokyo 100-8322 JP

国籍：JP

代理机构：Dealtry, Brian

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