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    • 3. 发明公开
    • LARGE EFFECTIVE AREA FIBER WITH GRADED INDEX GE-FREE CORE
    • 光纤具有大effectiver表面和无锗的渐变芯
    • EP2588905A1
    • 2013-05-08
    • EP11729842.2
    • 2011-06-22
    • Corning Incorporated
    • BICKHAM, Scott R.KHRAPKO, Rostislav RadiyevichMISHRA, Snigdharaj K.
    • G02B6/02G02B6/028
    • G02B6/0365G02B6/02019G02B6/02266G02B6/02395G02B6/0286
    • According to some embodiments an optical waveguide fiber comprises (i) a Ge free core having an effective area of 100 µm
      2 to 150 µm
      2 , at 1550 nm wavelength, said core comprising: a) a central core region extending radially outwardly from a centerline to a radius r
      1 , and having a relative refractive index percent profile Δ
      1 (r) in % measured relative to pure silica, wherein -0.1 % ≤ Δ
      1 (r) ≤0.12 %, wherein the central core region has a maximum relative refractive index percent, Δ
      1MAX ; (b) a first annular core region surrounding and directly adjacent to the central core region, having an α value 1.5 ≤ α ≤ 10, and extending to an outer radius r
      2 , wherein 6 µm ≤r
      2 ≤ 10 µm, and having a relative refractive index percent profile, Δ
      2 (r) in % measured relative to pure silica, a minimum relative refractive index Δ
      2MIN , a maximum relative refractive index Δ
      2MAX and the relative refractive index measured at a radius r = 2 µm, wherein 0.45 ≤ Δ
      2 ≤0; -0.25≥Δ
      2MIN ≥-0.45 and Δ
      1MAX ≥Δ
      2 (r =2 µm); (c) a fluorine doped second annular region surrounding and directly adjacent to the first annular core region and extending to a radius 20 µm ≤r
      3 ≤ 30 µm and having a negative relative refractive index percent profile, Δ
      3 (r) in %, measured relative to pure silica, with a minimum relative refractive index percent Δ
      3MIN and -0.5 % 3MIN 3MIN ≤ Δ
      2MIN ; (ii) a cladding surrounding the core and having a relative refractive index percent Δ
      4 (r) in % measured relative to pure silica and a minimum refractive index delta Δ
      4MIN , and -0.4 %