公开(公告)号：US06625360B2

公开(公告)日：2003-09-23

申请号：US09845301

申请日：2001-05-01

申请人： Takeshi Kyogoku ,  Masumi Ito ,  Takehiko Kito ,  Sumio Hoshino

发明人： Takeshi Kyogoku ,  Masumi Ito ,  Takehiko Kito ,  Sumio Hoshino

IPC分类号： G02B602

CPC分类号： G02B6/03633 ,  G02B6/02 ,  G02B6/02214 ,  G02B6/0283 ,  G02B6/03644 ,  G02B6/03661

摘要： For an index change of an interfacial region 20 which is formed in a boundary between core region 10 and cladding region 30 and which decreases its refractive indices from the core region 10 side to the cladding region 30 side, a change rate in relative index difference (0.5×&Dgr;n)/(d/r) normalized by a core radius r, obtained for a domain of change from 0.8×&Dgr;n to 0.3×&Dgr;n relative to a relative index difference &Dgr;n of the core region 10, is used as an index for evaluation of refractive index change and an allowable range of values thereof is set to a range of the lower limit of 0.4% to the upper limit of 4.0%, whereby a single-mode optical fiber capable of low loss phototransmission can be realized while reducing influence of a tail spread and strain in the optical fiber.

摘要翻译： 对于形成在芯区域10和包层区域30之间的边界并且使其从芯部区域10侧到包层区域30侧的折射率降低的界面区域20的折射率变化，相对折射率差的变化率 0.5xDeltan）/（d / r）作为折射率的评价指标，用芯轴半径r进行归一化，该芯半径r是从0.8xDeltan变为0.3xDeltan而得到的，相对于芯部区域10的相对折射率差Deltan， 指标变化和其允许值的范围被设定为下限0.4％至上限4.0％的范围，由此可以实现能够实现低损耗光传输的单模光纤，同时减少尾部的影响 在光纤中扩散和应变。