Optical fiber with primary and secondary coating layers

Patent metadata

Field	Value
Publication number	US-11835756-B2
Application number	US-201917289948-A
Country	US
Kind code	B2
Filing date	Nov 8, 2019
Priority date	Nov 9, 2018
Publication date	Dec 5, 2023
Grant date	Dec 5, 2023

Abstract

An optical fiber comprises a glass fiber comprising a core and a cladding; and a coating resin layer coating the glass fiber, wherein the coating resin layer has a primary resin layer in contact with the glass fiber and coating the glass fiber and a secondary resin layer coating the outer periphery of the primary resin layer, the primary resin layer has a Young's modulus of 0.4 MPa or less at 23° C. and the primary resin layer has an outer diameter of 185 μm or more and 202 μm or less, the secondary resin layer has a glass transition temperature of 60° C. or more and 95° C. or less, and the difference between the average linear expansion coefficient of the coating resin layer in the range of 60° C. to 140° C. and the average linear expansion coefficient of the coating resin layer in the range of −60° C. to 0° C. is 0.7×10 −4 /° C. or less.

First claim

The invention claimed is:

1. An optical fiber comprising:
a glass fiber comprising a core and a cladding; and
a coating resin layer coating the glass fiber,
wherein the coating resin layer has a primary resin layer in contact with the glass fiber and coating the glass fiber and a secondary resin layer coating the outer periphery of the primary resin layer,
the primary resin layer has a Young's modulus of 0.4 MPa or less at 23° C. and the primary resin layer has an outer diameter of 185 μm or more and 202 μm or less,
the secondary resin layer has a glass transition temperature of 60° C. or more and 95° C. or less, and
a difference between an average linear expansion coefficient of the coating resin layer in the range of 60° C. to 140° C. and an average linear expansion coefficient of the coating resin layer in the range of −60° C. to 0° C. is 0.7×10 −4 /° C. or less.

2. The optical fiber according to claim 1 , wherein the primary resin layer comprises a cured product of a resin composition containing a urethane oligomer, a monomer and a photopolymerization initiator, and the resin composition contains 40 mass % or more of a one-end non-reactive oligomer based on the total amount of the urethane oligomer.

3. The optical fiber according to claim 1 , wherein the glass fiber has an effective core cross-sectional area of 110 μm 2 or more and 170 μm 2 or less.

4. The optical fiber according to claim 3 , wherein the primary resin layer has a Young's modulus at 23° C. of 0.3 MPa or less, and the glass fiber has an effective core cross-sectional area of 140 μm 2 or more and 170 μm 2 or less.

5. The optical fiber according to claim 1 , further comprising a colored layer coating the outer periphery of the secondary resin layer.

6. The optical fiber according to claim 2 , wherein the glass fiber has an effective core cross-sectional area of 110 μm 2 or more and 170 μm 2 or less.

7. The optical fiber according to claim 6 , wherein the primary resin layer has a Young's modulus at 23° C. of 0.3 MPa or less, and the glass fiber has an effective core cross-sectional area of 140 μm 2 or more and 170 μm 2 or less.

8. The optical fiber according to claim 2 , further comprising a colored layer coating the outer periphery of the secondary resin layer.

9. The optical fiber according to claim 3 , further comprising a colored layer coating the outer periphery of the secondary resin layer.

10. The optical fiber according to claim 4 , further comprising a colored layer coating the outer periphery of the secondary resin layer.

11. The optical fiber according to claim 6 , further comprising a colored layer coating the outer periphery of the secondary resin layer.

12. The optical fiber according to claim 7 , further comprising a colored layer coating the outer periphery of the secondary resin layer.

Assignees

• Sumitomo Electric Industries

Inventors

• Shimada Kensaku
• Sohma Kazuyuki
• Konishi Tatsuya

Classifications

• 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

• C03C25/1065

  Multiple coatings · CPC title

• C03C25/326

  Polyureas; Polyurethanes · CPC title

• G02B6/4402 Primary

  with one single optical waveguide (G02B6/4429, G02B6/4439, G02B6/4479 take precedence) · CPC title

• C08F290/067

  Polyurethanes; Polyureas · CPC title