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1. 发明公开

EP3009868A4 OPTICAL FIBER 有权
标题翻译：光纤
公开(公告)号：EP3009868A4
公开(公告)日：2016-07-13
申请号：EP14811519
申请日：2014-06-06
申请人： SUMITOMO ELECTRIC INDUSTRIES
发明人： HARUNA TETSUYA , HIRANO MASAAKI , TAMURA YOSHIAKI , HIKICHI NOBUHIRO
IPC分类号： G02B6/036 , G02B6/028
CPC分类号： G02B6/03644 , G02B6/0283 , G02B6/0286
摘要： Provided is an optical fiber that has a depressed cladding structure including a core, which is made of silica based glass containing Cl, and a first cladding and a second cladding, which are made of silica based glass containing fluorine, and that can perform single-mode propagation at a signal light wavelength. The optical fiber includes the core, the first cladding, and the second cladding. The core is made of silica based glass containing Cl. The first cladding and the second cladding are made of silica based glass containing fluorine. The refractive index of the first cladding is lower than the refractive index of the core. The refractive index of the second cladding is lower than the refractive index of the core and higher than the refractive index of the first cladding. The second cladding is divided into an outer region that has a uniform refractive index and an inner region that has a refractive index higher than the refractive index of the outer region. The difference ”P between the maximum refractive index of the inner region and the refractive index of the outer region is 0.02% or greater and 0.10% or smaller in terms of relative refractive index with respect to pure silica glass. The radial thickness R of the inner region is 10 µm or greater and 25 µm or smaller.

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