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    • 5. 发明专利
    • Method for making optical fiber preform
    • 制造光纤预制件的方法
    • JP2013032241A
    • 2013-02-14
    • JP2011168706
    • 2011-08-01
    • Sumitomo Electric Ind Ltd住友電気工業株式会社
    • HARUNA TETSUYAHIRANO MASAAKITAMURA YOSHIAKI
    • C03B37/012C03B37/018C03C13/04
    • C03B37/01807C03B37/01211C03B37/014C03B2201/20C03B2201/50C03B2203/22C03C13/04G02B6/02014G02B6/02242G02B6/02266G02B6/03627
    • PROBLEM TO BE SOLVED: To provide a method for manufacturing an optical fiber preform that is suitable for producing a low attenuation optical fiber with high yield.SOLUTION: The method for manufacturing an optical fiber preform comprises a step of preparing a core rod and a step of adding a cladding region. At the step of preparing a core rod, the core rod is produced including a first core region 21 with a Cl concentration of less than 600 atomic ppm, a second core region 22 with a Cl concentration of less than 600 atomic ppm around the first core region, and a third core region 23 with a Cl concentration of 3,000 atomic ppm or more around the second core region, wherein an alkali metal is selectively added to the first core region among the first, second, and third core regions. At the step of adding a cladding region around the core rod, a cladding region 30 is formed around the core rod by heating at a temperature of 1,200°C, or higher for 7 hours or less.
    • 要解决的问题:提供一种适用于以高产率生产低衰减光纤的光纤预制棒的制造方法。 解决方案:制造光纤预制棒的方法包括制备芯棒的步骤和添加包层区域的步骤。 在制备芯棒的步骤中,制造芯棒,其包括Cl浓度小于600原子ppm的第一芯区域21,第一芯体周围的Cl浓度小于600原子ppm的第二芯区域22 以及围绕第二芯区域的Cl浓度为3000原子ppm以上的第三核心区域23,其中在第一,第二和第三核心区域中的第一核心区域选择性地添加碱金属。 在芯棒周围添加包层区域的步骤中,通过在1200℃以上的温度加热7小时以下,在芯棒周围形成包层区域30。 版权所有(C)2013,JPO&INPIT
    • 7. 发明专利
    • Optical fiber
    • 光纤
    • JP2010271448A
    • 2010-12-02
    • JP2009121725
    • 2009-05-20
    • Shin-Etsu Chemical Co Ltd信越化学工業株式会社
    • OYAMADA HIROSHI
    • G02B6/036G02B6/02
    • G02B6/0365G02B6/02014G02B6/02266
    • PROBLEM TO BE SOLVED: To provide an optical fiber having an MFD (mode field diameter) conforming to G652 standard (preferably 9 μm or above), improved bending characteristics, and for operating in a multi mode at 850 nm and having a wide transmission band. SOLUTION: The optical fiber includes: a first core at a center thereof; a second core adjacent to the first core to cover a circumference of the first core; a third core adjacent to the second core to cover a circumference of the second core; and a cladding adjacent to the third core to cover a circumference of the third core, where conditions of 0.28%≤Δ1≤0.4%, -0.05%≤Δ2≤0.05%, -1.0%≤Δ3≤-0.5%, 3.8 μm≤a≤4.5 μm, 12 μm≤b≤21 μm, and 1.5 μm≤c-b≤10 μm hold, where Δ1 is a specific refractive index difference of the first core from the cladding refractive index, Δ2 is a specific refractive index difference of the second core from the cladding refractive index, Δ3 is a specific refractive index difference of the third core from the cladding refractive index, "a" is a radius of a boundary between the first core and the second core with respect to a center of the first core, "b" is a radius of a boundary between the second core and the third core with respect to the center of the first core, and "c" is a radius of a boundary between the third core and the cladding with respect to the center of the first core. COPYRIGHT: (C)2011,JPO&INPIT
    • 解决的问题:为了提供具有符合G652标准(优选9μm以上)的MFD(模场直径)的光纤,改善的弯曲特性,并且在850nm的多模式下操作,并且具有 宽传输带。 光纤包括:第一芯在其中心; 与所述第一芯相邻的第二芯,以覆盖所述第一芯的圆周; 与所述第二芯相邻的第三芯,以覆盖所述第二芯的圆周; 以及与第三芯相邻的包层以覆盖第三芯的圆周,其中条件为0.28%≤Δ1≤0.4%,-0.05%≤Δ2≤0.05%,-1.0%≤Δ3≤-0.5%,3.8μm≤ a≤4.5μm,12μm≤b≤21μm,1.5μm≤cb≤10μm保持,其中Δ1是第一芯与包层折射率的比折射率差,Δ2是 第二芯从包层折射率Δ3是第三芯与包层折射率的比折射率差,“a”是第一芯与第二芯之间的边界相对于第一芯的中心的半径 芯“b”是相对于第一芯的中心的第二芯和第三芯之间的边界的半径,“c”是第三芯与包层之间的相对于第一芯的边界的半径 中心的第一核心。 版权所有(C)2011,JPO&INPIT
    • 8. 发明专利
    • Single-mode optical fiber
    • 单模光纤
    • JP2010176122A
    • 2010-08-12
    • JP2010005511
    • 2010-01-14
    • Draka Comteq Bvドラカ・コムテツク・ベー・ベー
    • SILLARD PIERREMOLIN DENISDE MONTMORILLON LOUIS-ANNEBIGOT-ASTRUC MARIANNERICHARD SIMON
    • G02B6/036
    • G02B6/02019G02B6/02266G02B6/03644G02B6/03666
    • PROBLEM TO BE SOLVED: To provide a transmission fiber having an enlarged effective cross-sectional area exceeding 90 μm
      2 without deviating from the recommendation of the G.652 standard.
      SOLUTION: The single-mode optical fiber includes: a central core (r
      1 , Δn
      1 ); an intermediate cladding (r
      2 , Δn
      2 ); a ring (r3, Δn
      3 ); and an outer cladding. The optical fiber has an effective cross-sectional area of 90 μm
      2 or more at wavelength of 1,550 nm. Further, the optical fiber has a cable cut-off wavelength λ
      CC less than 1,260 nm; a mode field diameter contained between 8.6 μm and 9.5 μm at wavelength of 1,310 nm; a wavelength of zero wavelength dispersion contained between 1,300 nm and 1,324 nm; and a dispersion slope less than 0.092 ps/nm
      2 -km. The fiber has an effective cross-sectional area exceeding 90 μm
      2 without deteriorating other optical parameters of the fiber as compared with SSMF.
      COPYRIGHT: (C)2010,JPO&INPIT
    • 要解决的问题:提供具有扩大的有效截面面积超过90μm 2 的传输光纤,而不偏离G.652标准的推荐。 解决方案:单模光纤包括:中心芯(r 1 ,Δn 1 ); 中间包层(r 2 ,Δn 2 ); 环(r3,Δn 3 ); 和外包层。 该光纤在1,550nm的波长处具有90μm的有效横截面积 2 或更大。 此外,光纤的电缆截止波长λ 小于1,260nm; 在1300nm波长下包含8.6μm和9.5μm之间的模场直径; 零波长色散波长包含在1300nm和1,324nm之间; 和小于0.092ps / nm 2 -km的色散斜率。 与SSMF相比,光纤的有效截面面积超过90μm 2 ,而不会劣化光纤的其他光学参数。 版权所有(C)2010,JPO&INPIT