Optical fiber core and optical fiber ribbon core

Patent metadata

Field	Value
Publication number	US-10197724-B2
Application number	US-201415512965-A
Country	US
Kind code	B2
Filing date	Dec 25, 2014
Priority date	Sep 26, 2014
Publication date	Feb 5, 2019
Grant date	Feb 5, 2019

Abstract

An optical fiber comprises a glass fiber having a core and a cladding with which the core is covered, and a coating resin layer with which the glass fiber is covered, the coating resin layer having a colored layer of a thickness of 10 μm or more, wherein a change rate of a yellow index of the coating resin layer after aging due to temperature and humidity under an environment of 85° C. and 85% RH for 30 days is 5 or less per day.

First claim

The invention claimed is:

1. An optical fiber comprising:
a glass fiber having a core and a cladding with which the core is covered, and a coating resin layer with which the glass fiber is covered;
the coating resin layer having a primary coating resin layer covering the glass fiber and a secondary coating resin layer covering the primary coating resin layer, wherein
at least one of the primary coating resin layer and the secondary coating resin layer is a colored layer of a thickness of 10 μm or more,
the colored layer contains a titanium element, and
a change rate of a yellow index (YI) of the coating resin layer after aging due to temperature and humidity under an environment of 85° C. and 85% RH for 30 days is 5 or less per day.

2. The optical fiber according to claim 1 , wherein a gel fraction of the coating resin layer is more than 75% by mass.

3. The optical fiber according to claim 1 , wherein an amount of an unreacted photoinitiator in the coating resin layer is 3% by mass or less.

4. The optical fiber according to claim 1 , wherein the colored layer contains a pigment.

5. An optical fiber ribbon comprising a plurality of the optical fibers according to claim 1 .

Assignees

• Sumitomo Electric Industries

Inventors

• Tachibana Kumiko
• Fujii Takashi

Classifications

• C03C25/24

  Coatings containing organic materials · CPC title

• G02B6/4482

  Code or colour marking · CPC title

• C03C25/47

  containing particles, fibres or flakes, e.g. in a continuous phase · CPC title

• C03C25/106

  Single coatings · CPC title

• G02B6/4486

  Protective covering · CPC title