METHOD FOR MANUFACTURING OPTICAL FIBER

• Main Authors: TSUCHIDA YUKIHIRO, AISO KEIICHI, MUKASA KAZUNORI, TAKEUCHI YUGO, ARAI SHINICHI
• Format: Patent
• Language: English; Japanese
• Published: 01.10.2020
• Subjects: CHEMISTRY; GLASS; MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES; METALLURGY; MINERAL OR SLAG WOOL; OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICS; PHYSICS

To provide a method for manufacturing an optical fiber having reduced transmission loss.SOLUTION: The method for manufacturing an optical fiber comprises: the high temperature pressing step of heating an optical fiber preform including a core part and a cladding part formed in the outer periphery of the core part at less than 1800 degrees while pressing the preform at 100 MPa or more and 2000 MPa or less; and the drawing step of heating and melting an end portion of the optical fiber preform subjected to the high temperature pressing step at 1800 degrees or more to draw an optical fiber at a drawing speed of 900 m/minute or more.SELECTED DRAWING: Figure 1 【課題】伝送損失が低減された光ファイバの製造方法を提供すること。【解決手段】光ファイバの製造方法は、コア部と前記コア部の外周に形成されたクラッド部とを備える光ファイバ母材を１００ＭＰａ以上２０００ＭＰａ以下で加圧しながら１８００度未満に加熱する高温加圧工程と、前記高温加圧工程を施した光ファイバ母材の一端部を１８００度以上に加熱して溶融し、９００ｍ／分以上の線引き速度で光ファイバを引き出す線引き工程と、を含む。【選択図】図１