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    • 7. 发明公开
    • BEND-INSENSITIVE MULTIMODE OPTICAL FIBER WITH REDUCED IMPACT OF LEAKY MODES
    • 生物多样性多功能玻璃纤维素麻醉剂减肥剂BEEINFLUSSUNG VON UNDICHTIGKEITSMODI
    • EP3014320A1
    • 2016-05-04
    • EP13734985.8
    • 2013-06-26
    • Draka Comteq BV
    • MOLIN, DenisBIGOT-ASTRUC, MarianneSILLARD, PierreACHTEN, Franciscus, Johannes
    • G02B6/028G02B6/036
    • G02B6/0365G02B6/0281G02B6/0288
    • The invention relates to a multimode optical fiber comprising an optical core and an optical cladding surrounding the optical core, the optical core having a refractive graded- index profile, the optical cladding comprising: an inner layer surrounding said optical core, an intermediate layer, called "depressed trench", surrounding said inner layer, an outer layer surrounding said depressed trench and having a constant refractive index, said depressed trench having a width W and a negative refractive index difference Δn
      t with respect to the outer layer, and being designed so as to satisfy the following inequality: |0.585677 - 114.681 x
      S + 13.7287 x
      S
      2 + 18.7343 x
      S x
      W - 4.61112 x
      S x Δ
      n
      t .10
      3 - 0.913789 x
      W x Δ
      n
      t .10
      3 | +2 x
      W x Δ
      n
      t .10
      3 μ m and 1.6
      μ m; Δn
      t is comprised between -11.10
      -3 and -4.10
      -3 ;
      W x Δ
      n
      t .10
      3 is lower than -25
      μ m.
    • 提供了一种多模光纤,其包括光学核心和围绕光学核心的光学包层。 光学芯具有折射分级折射率分布。 光学包层包括:围绕光纤芯的内层,围绕内层的称为“凹槽”的中间层,以及围绕凹陷沟槽并具有恒定折射率的外层。 凹陷沟槽相对于外层具有宽度W和负折射率差Dgr; nt,并被设计成满足以下不等式:| 0.585677-114.681×S + 13.7287×S2 + 18.7343×S×W -4.61112×S×&Dgr; nt·103-0.913789×W×&Dgr; nt·103 | + 2×W×&Dgr; nt·103 <-30其中:S为内包层的宽度, μm和1.6μm; &Dgr; nt包含在-11.10-3和-4.10-3之间; W×&Dgr; nt·103低于-25μm。