公开(公告)号：US20140241686A1

公开(公告)日：2014-08-28

申请号：US13781041

申请日：2013-02-28

Applicant: FUJIKURA, LTD.

Inventor： Takayuki KITAMURA ,  Akihito IMASE ,  Munehisa FUJIMAKI

IPC: G02B6/036

CPC classification number: G02B6/02019 ,  G02B6/0365

Abstract: An optical fiber is provided. The optical fiber has a refractive index profile that includes a central core, an inner cladding layer, a trench layer, and an outer cladding layer. A trench layer is provided with a reduced refractive index. The optical fiber has a large effective area without having an increase of a cutoff wavelength, and exhibits low macrobending loss.

Abstract translation: 提供光纤。 光纤具有包括中心芯，内包层，沟槽层和外包层的折射率分布。 沟槽层具有降低的折射率。 光纤具有大的有效面积而不增加截止波长，并且表现出较小的弯曲损耗。

公开(公告)号：US20170217822A1

公开(公告)日：2017-08-03

申请号：US15514679

申请日：2016-08-10

Applicant: FUJIKURA LTD.

Inventor： Akihito IMASE

IPC: C03B37/025

CPC classification number: C03B37/0253 ,  C03B37/02718 ,  C03B2205/56 ,  C03B2205/72 ,  Y02P40/57

Abstract: An optical fiber manufacturing method includes: melting and drawing an optical fiber preform to form a glass fiber; cooling the glass fiber while inserting the glass fiber into a tubular slow-cooling device from an inlet end toward an outlet end thereof, and lowering an inner wall temperature of the slow-cooling device below a temperature of the glass fiber and providing a pressure gradient in which a pressure increases in a direction from the inlet end toward the outlet end inside the slow-cooling device when cooling the glass fiber, wherein the average pressure change dP/dL in a moving direction of the glass fiber inside the slow-cooling device satisfies the following Formula (1) when the tube inner diameter of the slow-cooling device is defined as D [m] and the length of an internal space of the slow-cooling device in the moving direction of the glass fiber is defined as L [m]. (πD2/4)×dP/dL≦0.03  (1)

公开(公告)号：US20130251322A1

公开(公告)日：2013-09-26

申请号：US13849319

申请日：2013-03-22

Applicant: FUJIKURA LTD.

Inventor： Takayuki KITAMURA ,  Akihito IMASE

IPC: G02B6/02

CPC classification number: G02B6/02 ,  C03B37/01446 ,  C03B37/0146 ,  C03B2201/50 ,  C03B2201/54

Abstract: A method of manufacturing a glass preform is provided. The method including, vaporizing an alkali metal compound or an alkali earth metal compound and being brought the alkali metal compound or the alkali earth metal compound into contact with a hydroxyl group on a surface of porous silica glass and dehydrating the porous silica glass, and sintering the dehydrated porous silica glass and forming a transparent glass body.

Abstract translation: 提供一种制造玻璃预制件的方法。 该方法包括使碱金属化合物或碱土金属化合物蒸发，并使碱金属化合物或碱土金属化合物与多孔二氧化硅玻璃表面的羟基接触并使多孔石英玻璃脱水，并烧结 脱水多孔石英玻璃，形成透明玻璃体。