Three-layer thin-coated fiber having improved damage resistance

Patent metadata

Field	Value
Publication number	US-2024393527-A1
Application number	US-202418662275-A
Country	US
Kind code	A1
Filing date	May 13, 2024
Priority date	May 26, 2023
Publication date	Nov 28, 2024
Grant date	—

Abstract

An optical fiber includes a glass core, a glass cladding surrounding and in direct contact with the glass core, and a coating surrounding and in direct contact with the glass cladding. The coating includes three layers, a first high-modulus coating layer having a Young's modulus greater than 500 MPa, a second high-modulus coating layer having a Young's modulus greater than 500 MPa, and a low-modulus coating layer having a Young's modulus between about 0.20 MPa and 5 MPa. The coating may have the first high-modulus coating layer as the inner layer, the low-modulus coating layer as the intermediate layer, and the second high-modulus coating layer as the outer layer. Alternatively, the coating may have the low-modulus coating layer as the inner layer, first high-modulus coating layer as the intermediate layer, and the second high-modulus coating layer as the outer layer.

First claim

What is claimed is:

1 . An optical fiber, comprising:
a glass core; a glass cladding surrounding and in direct contact with the glass core; and a coating surrounding and in direct contact with the glass cladding, the coating including:
a first high-modulus coating layer having a Young's modulus greater than 500 MPa;
a second high-modulus coating layer having a Young's modulus greater than 500 MPa; and
a low-modulus coating layer having a Young's modulus between about 0.20 MPa and 5 MPa,
wherein an outer circumference of the optical fiber has a diameter less than about 200 μm.

2 . The optical fiber of claim 1 , wherein the outer circumference of the optical fiber has a diameter of less than about 180 μm.

3 . The optical fiber of claim 2 , wherein the outer circumference of the optical fiber has a diameter from about 160 μm to about 170 μm.

4 . The optical fiber of claim 1 , wherein at least one of the first high-modulus coating layer, the second high-modulus coating layer, and the low-modulus coating layer is a radially innermost coating layer that is directly adjacent the glass cladding, the radially innermost coating layer being the thinnest coating layer.

5 . The optical fiber of claim 1 , wherein the optical fiber has an attenuation at 1310 nm wavelength of about 0.50 dB/km or less and a cable cutoff of about 1260 nm or less.

6 . The optical fiber of claim 5 , wherein the attenuation at 1310 nm wavelength is about 0.40 dB/km or less.

7 . The optical fiber of claim 6 , wherein the attenuation at 1310 nm wavelength is about 0.35 dB/km or less.

8 . The optical fiber of claim 5 , wherein the attenuation at 1310 nm wavelength is from about 0.50 dB/km to about 0.25 dB/km.

9 . The optical fiber of claim 5 , wherein the cable cutoff is about 1225 nm or less.

10 . The optical fiber of claim 5 , wherein the optical fiber has an attenuation at 1550 nm wavelength of about 0.50 dB/km or less.

11 . The optical fiber of claim 10 , wherein the attenuation at 1550 nm wavelength is about 0.30 dB/km or less.

12 . The optical fiber of claim 11 , wherein the attenuation at 1550 nm wavelength is about 0.25 dB/km or less.

13 . The optical fiber of claim 10 , wherein the attenuation at 1550 nm wavelength is from about 0.50 dB/km to about 0.15 dB/km.

14 . The optical fiber of claim 1 , wherein the optical fiber has a mode field diameter at 1310 nm wavelength of about 8.2 μm or greater.

15 . The optical fiber of claim 14 , wherein the mode field diameter at 1310 nm wavelength is from about 8.2 μm to about 9.7 μm.

16 . The optical fiber of claim 1 , wherein the optical fiber has an effective area at 1310 nm wavelength from about 54.0 micron 2 to about 70.0 micron 2 .

17 . The optical fiber of claim 16 , wherein the effective area at 1310 nm wavelength is from about 58.0 micron 2 to about 68.0 micron 2 .

18 . The optical fiber of claim 1 , wherein the first high-modulus coating layer is surrounding and in direct contact with the glass cladding, the low-modulus coating layer is surrounding and in direct contact with the first high-modulus coating layer, and the second high-modulus coating layer is surrounding and in direct contact with the low-modulus coating layer.

19 . The optical fiber of claim 18 , wherein the first high-modulus coating layer has a thickness of less than about 10 μm, the low-modulus coating layer has a thickness of less than about 17.5 μm, and the second high-modulus coating layer has a thickness of less than about 25 μm.

20 . The optical fiber of claim 18 , wherein the first high-modulus coating layer comprises a cured product that includes a monomer, a photoinitiator, a slip agent, and an adhesion promoter.

Assignees

• Corning Inc

Inventors

• Clark Donald Arthur
• Drake Matthew Ryan
• Gu Yunfeng
• Li Ming-Jun
• Mccarthy Joseph Edward
• Niu Weijun

Classifications

• G02B6/0365

  arranged - - + · 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