Optical fiber core and optical fiber tape core

Patent metadata

Field	Value
Publication number	US-9964700-B2
Application number	US-201515129975-A
Country	US
Kind code	B2
Filing date	Dec 2, 2015
Priority date	Dec 3, 2014
Publication date	May 8, 2018
Grant date	May 8, 2018

Abstract

An optical fiber comprises a glass fiber, and a coating resin layer with which the glass fiber is covered, the coating resin layer has a plurality of layers, the plurality of layers includes a first layer being in contact with the glass fiber, and a longest diameter at −40° C. of a void formed in the first layer is 100% or more and 300% or less of a longest diameter at 23° C. thereof, or a longest diameter at −40° C. of a void formed in the first layer is 100% or more and 600% or less of a longest diameter at 23° C. thereof, and a Young's modulus of the first layer is 0.3 MPa or less.

First claim

The invention claimed is:

1. An optical fiber comprising a glass fiber and a coating resin layer with which the glass fiber is covered;
the coating resin layer having a plurality of layers;
the plurality of layers including a first layer being in contact with the glass fiber, wherein a longest diameter at −40° C. of a void formed in the first layer is 100% or more and 300% or less of a longest diameter at 23° C. thereof; and
the plurality of layers including a second layer in contact with the first layer, and the second layer containing a titanium element,
wherein an increment of a transmission loss at −40° C. relative to a transmission loss at 23° C. is 0.05 dB/km or less.

2. The optical fiber according to claim 1 , wherein a Young's modulus of the first layer is 0.8 MPa or less at room temperature.

3. The optical fiber according to claim 1 , wherein the second layer is colored.

4. An optical fiber ribbon in which a plurality of the optical fibers according to claim 3 are in parallel and covered with a ribbon material.

5. An optical fiber comprising a glass fiber and a coating resin layer with which the glass fiber is covered;
the coating resin layer having a plurality of layers;
the plurality of layers including a first layer being in contact with the glass fiber, wherein a longest diameter at −40° C. of a void formed in the first layer is 100% or more and 600% or less of a longest diameter at 23° C. thereof, and a Young's modulus of the first layer is 0.3 MPa or less; and
the plurality of layers including a second layer in contact with the first layer, and the second layer containing a titanium element,
wherein an increment of a transmission loss at −40° C. relative to a transmission loss at 23° C. is 0.05 dB/km or less.

6. The optical fiber according to claim 5 , wherein the second layer is colored.

7. An optical fiber ribbon in which a plurality of the optical fibers according to claim 6 are in parallel and covered with a ribbon material.

Assignees

• Sumitomo Electric Industries

Inventors

• Tachibana Kumiko
• Fujii Takashi
• Iwaguchi Noriaki

Classifications

• C03C25/475 Primary

  containing colouring agents · CPC title

• C03C25/1065

  Multiple coatings · CPC title

• G02B6/4403

  with ribbon structure (G02B6/4429, G02B6/4439, G02B6/4479 take precedence) · CPC title

• G02B6/02395 Primary

  Glass optical fibre with a protective coating, e.g. two layer polymer coating deposited directly on a silica cladding surface during fibre manufacture (G02B6/02052, G02B6/02057, G02B6/024, G02B6/032, G02B6/105, G02B6/14 take precedence; coating on fibre gratings G02B6/02104; multilayer core or cladding G02B6/036; reinforcing splice joints G02B6/2558; optical cables, i.e. comprising protective structures external to the protective coating such as a jacket or plural coated optical fibres G02B6/44; coating of glass to obtain optical fibres C03C25/104) · CPC title

• C03C25/24

  Coatings containing organic materials · CPC title