公开(公告)号：US20160209585A1

公开(公告)日：2016-07-21

申请号：US15083957

申请日：2016-03-29

Applicant: FUJIKURA LTD.

Inventor： Tatsuya KISHI ,  Sho ENDO ,  Takayuki KITAMURA

IPC: G02B6/028 ,  G02B6/036 ,  C03B37/018 ,  G02B6/02

CPC classification number: G02B6/0281 ,  C03B37/014 ,  C03B37/018 ,  C03B2201/02 ,  C03B2201/12 ,  C03B2201/20 ,  C03B2203/22 ,  C03B2203/23 ,  C03B2203/26 ,  G02B6/02009 ,  G02B6/02028 ,  G02B6/028 ,  G02B6/03627 ,  G02B6/03633 ,  G02B6/0365

Abstract: An optical fiber includes a core, and a clad surrounding an outer circumference of the core, in which a first relative refractive index difference Δ1a is greater than 0, a second relative refractive index difference Δ1b is greater than 0, the first relative refractive index difference Δ1a is greater than the second relative refractive index difference Δ1b, the first relative refractive index difference Δ1a and the second relative refractive index difference Δ1b satisfy a relationship denoted by the following expression: 0.20≦(Δ1a−Δ1b)/Δ1a≦0.88, and a refractive index profile A of the core in an entire region of a section of 0≦r≦r1 as a function Δ(r) of a distance r from a center of the core in the radial direction is denoted by the following expression: Δ(r)=Δ1a−(Δ1a−Δ1b)r/r1.

Abstract translation: 光纤包括芯和围绕芯的外周的包层，其中第一相对折射率差Dgr1a大于0，第二相对折射率差Dgr; 1b大于0，第一 相对折射率差Dgr1a1大于第二相对折射率差Dgr; 1b，第一相对折射率差Dgr1a1和第二相对折射率差Dgr1b满足由以下表达式表示的关系：0.20＆nlE （＆Dgr; 1a-＆Dgr; 1b）/＆Dgr; 1a＆nlE; 0.88，并且在0＆lt; nlE的截面的整个区域中的芯的折射率分布A;作为函数的函数＆Dgr（r） （r）=＆Dgr; 1a - （＆Dgr; 1a-＆Dgr; 1b）r / r1表示从径向方向的芯的中心的r。

公开(公告)号：US20130098116A1

公开(公告)日：2013-04-25

申请号：US13710672

申请日：2012-12-11

Applicant: FUJIKURA LTD.

Inventor： Sho ENDO

IPC: G01M3/28

CPC classification number: G01M3/2846 ,  C03B37/0146 ,  Y02P40/57

Abstract: A muffle tube inspection method inspects a muffle tube used for dehydrating and sintering a silica glass-based optical fiber preform, the muffle tube includes a sintering furnace provided with a furnace body covering a heater disposed around a periphery of the muffle tube. The method detects a crack generated at the muffle tube by measuring a pressure inside the furnace body while varying a pressure inside the muffle tube.

Abstract translation: 马弗管检查方法检查用于对石英玻璃基光纤预制棒进行脱水和烧结的马弗管，马弗管包括烧结炉，该烧结炉设置有围绕马弗管周围设置的加热器。 该方法通过在改变马弗管内的压力的同时测量炉体内部的压力来检测在马弗管中产生的裂纹。