Germanium-free optical fibers having large numerical apertures
    1.
    发明授权
    Germanium-free optical fibers having large numerical apertures 失效
    具有大数值孔径的无锗光纤

    公开(公告)号:US4573762A

    公开(公告)日:1986-03-04

    申请号:US508429

    申请日:1983-06-27

    CPC分类号: C03C13/046 G02B6/02

    摘要: An optical fiber of germanium-free, multicomponent glasses has a core glass which has the molecular composition: SiO.sub.2 : 57.5-65%; (ZrO.sub.2 +1/2Y.sub.2 O.sub.3): 0-5%; (MgO+CaO+SrO+BaO+ZnO): 12.5-27.5 where MgO: 0-5%, CaO: 0-10%, SrO: 0-7.5%, BaO: 0-15% ZnO: 0-20%, and in which if no BaO is present, the ZnO content is 12.5-20%, and if no ZnO is present, the BaO content is 5-15%, and (Li.sub.2 O+Na.sub.2 O+K.sub.2 O): 10-25%. The core glass has a K.sub.2 O content which is preferably smaller than half of the total alkali metal oxide content. The cladding glass consists of a silicate glass or a borosilicate glass having a refractive index which is at least 2% lower than the refractive index of the core glass. The viscosity of the cladding glass at the processing temperature is 0.5 to twice the viscosity of the core glass expressed in Pa.s.

    摘要翻译: 无锗的多组分玻璃的光纤具有芯玻璃,其分子组成为:SiO2:57.5-65%; (ZrO 2 + 1 / 2Y 2 O 3):0-5% (MgO + CaO + SrO + BaO + ZnO):12.5-27.5其中MgO:0-5%,CaO:0-10%,SrO:0-7.5%,BaO:0-15%ZnO:0-20% 如果不存在BaO,ZnO含量为12.5〜20%,如果不存在ZnO,则BaO含量为5〜15%,(Li 2 O + Na 2 O + K 2 O):10〜25%。 核心玻璃的K 2 O含量优选小于总碱金属氧化物含量的一半。 包层玻璃由折射率比核心玻璃的折射率低至少2%的硅酸盐玻璃或硼硅酸盐玻璃组成。 包层玻璃在加工温度下的粘度是以Pa.s表示的芯玻璃的粘度的两倍。

    Optical fiber of the graded index type and method of producing same
    2.
    发明授权
    Optical fiber of the graded index type and method of producing same 失效
    分级指数型光纤及其制造方法

    公开(公告)号:US4439008A

    公开(公告)日:1984-03-27

    申请号:US387993

    申请日:1982-06-14

    CPC分类号: C03C13/046

    摘要: An optical fiber of the graded index type consisting of a glass having predominantly the composition 60-70 mole % SiO.sub.2, 15-30 mole % alkali metal oxides, and 10 to 15 mole % MgO in combination with at least one oxide selected from the group formed by CaO, SrO, BaO and ZnO. The impurity content of the fiber is less than 0.01 ppm. In the fiber the MgO content increases from the axis of the fiber to the circumference of the fiber. The oxide or the other oxides, having cations which can be exchanged for the magnesium cation, decrease to a corresponding extent in this direction.

    摘要翻译: 梯度折射率型的光纤由主要为组成为60-70摩尔%SiO 2,15-30摩尔%碱金属氧化物和10-15摩尔%MgO的玻璃组成的玻璃与至少一种选自以下的氧化物组合 由CaO,SrO,BaO和ZnO形成。 纤维的杂质含量小于0.01ppm。 在纤维中,MgO含量从纤维的轴线增加到纤维的周长。 可以与镁阳离子交换的具有阳离子的氧化物或其它氧化物在该方向上降低到相应的程度。