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    OPTICAL FIBER AND OPTICAL FIBER BASE MATERIAL
    2.
    发明公开
    OPTICAL FIBER AND OPTICAL FIBER BASE MATERIAL 审中-实审

    公开(公告)号：EP4372433A1

    公开(公告)日：2024-05-22

    申请号：EP22841952.9

    申请日：2022-06-29

    申请人： SUMITOMO ELECTRIC INDUSTRIES, LTD.

    发明人： SAKUMA Hirotaka ,  KAWAGUCHI Yuki ,  SATO Shin

    IPC分类号： G02B6/036 ,  C03C13/04 ,  G02B6/02

    CPC分类号： G02B6/036 ,  C03C13/04 ,  G02B6/02

    摘要： An optical fiber is made of silica-based glass. The optical fiber includes a core and a cladding circumscribing the core. A refractive index of the core is larger than a refractive index of the cladding. The core includes a first core having a central axis and a second core circumscribing the first core. A mean value of a mass fraction of chlorine in the first core is lower than a mean value of a mass fraction of chlorine in the second core. A mean value of a mass fraction of fluorine in the first core is higher than a mean value of a mass fraction of fluorine in the second core. A total value of the mean value of the mass fraction of chlorine and the mean value of the mass fraction of fluorine in the second core is 5000 ppm or less. The core includes either or both of an alkali metal element and an alkaline earth metal element.

    MULTICOMPONENT OXIDE GLASS, OPTICAL ELEMENT, OPTICAL FIBER, AND MULTICOMPONENT OXIDE GLASS MANUFACTURING METHOD
    6.
    发明公开
    MULTICOMPONENT OXIDE GLASS, OPTICAL ELEMENT, OPTICAL FIBER, AND MULTICOMPONENT OXIDE GLASS MANUFACTURING METHOD 审中-公开

    公开(公告)号：EP4067317A1

    公开(公告)日：2022-10-05

    申请号：EP20893354.9

    申请日：2020-10-23

    申请人： Sumita Optical Glass, Inc.

    发明人： ANZAI Dai

    IPC分类号： C03C3/091 ,  C03C3/093 ,  C03C13/04 ,  G02B1/00 ,  G02B6/02

    摘要： Provided is a glass having excellent solarization resistance that can be stably produced without the need for special work. The multicomponent oxide glass having a composition including: 45 mol% to 53 mol% SiO 2 ; 22 mol% to 30 mol% B 2 O 3 ; 5 mol% to 9 mol% Al 2 O 3 ; 0.02 mol% to 0.10 mol% Sb 2 O 3 ; 0 mol% to 18 mol% Li 2 O; 0 mol% to 18 mol% Na 2 O; 0 mol% to 18 mol% K 2 O; 0 mol% to 13 mol% MgO; 0 mol% to 13 mol% CaO; 0 mol% to 13 mol% BaO; and 0 mol% to 13 mol% ZnO. When the total content of Li 2 O, Na 2 O, and K 2 O is X mol% and the total content of MgO, CaO, BaO, and ZnO is Y mol%, 11 ≤ X ≤ 18 and 14 ≤ X + Y ≤ 24 hold, and the value of βOH calculated from βOH = α/t, where α represents a height of an absorption peak due to OH groups, observed in a range of 3400 cm -1 to 3800 cm -1 of an infrared absorption spectrum in no unit and t represents a thickness of the glass in cm, is 4 cm -1 or more.