Optical fiber

Patent metadata

Field	Value
Publication number	US-11927798-B2
Application number	US-201917054589-A
Country	US
Kind code	B2
Filing date	May 16, 2019
Priority date	May 16, 2018
Publication date	Mar 12, 2024
Grant date	Mar 12, 2024

Abstract

The optical fiber comprises a glass fiber comprising a core and a cladding, a primary resin layer in contact with the glass fiber and covering the glass fiber, and a secondary resin layer covering the primary resin layer, wherein the primary resin layer contains a cured product of a resin composition containing a urethane (meth)acrylate oligomer, a monomer, a photopolymerization initiator and an aromatic acid compound, a content of the aromatic acid compound is 20 ppm or more and 12000 ppm or less based on a total amount of the resin composition, and Young's modulus of the primary resin layer is 0.6 MPa or less at 23° C.±2° C.

First claim

The invention claimed is:

1. An optical fiber comprising a glass fiber comprising a core and a cladding, a primary resin layer in contact with the glass fiber and covering the glass fiber, and a secondary resin layer covering the primary resin layer,
wherein the primary resin layer comprises a cured product of a resin composition containing a urethane (meth)acrylate oligomer, a monomer, a photopolymerization initiator and an aromatic acid compound,
a content of the aromatic acid compound is 20 ppm or more and 12000 ppm or less based on a total amount of the resin composition,
a Young's modulus of the primary resin layer is 0.6 MPa or less at 23° C.±2° C.,
the resin composition contains the aromatic acid compound comprising two or more aromatic acid compounds, and
the aromatic acid compound comprises diphenyl phosphinic acid and trimethylbenzoic acid.

2. The optical fiber according to claim 1 , wherein the resin composition contains a polar monomer as the monomer and a content of the polar monomer is 3 mass % or more and 15 mass % or less based on the total amount of the resin composition.

3. The optical fiber according to claim 1 , wherein the resin composition further contains two or more silane coupling agents.

4. The optical fiber according to claim 1 , wherein a Young's modulus of the secondary resin layer is 1500 MPa or more at 23° C.

5. The optical fiber according to claim 1 , wherein the secondary resin layer contains an inorganic oxide.

6. The optical fiber according to claim 1 ,
wherein a mode field diameter of the optical fiber at a wavelength of 1310 nm is 8.2 μm or more and 9.6 μm or less, and a cable cutoff wavelength is 1260 nm or less,
wherein an increase in loss at a wavelength of 1625 nm when the optical fiber is wound around a mandrel having a radius of 15 mm is 1.0 dB or less per 10 of winding number, and
wherein a difference between a transmission loss at a wavelength of 1550 nm when the optical fiber is wound at tensile strength of 80 g around a bobbin on which a metallic mesh material having a diameter of a longitudinal wire of 50 μm, a diameter of a lateral wire of 50 μm and a pitch of 150 μm is wound and a transmission loss at the wavelength of 1550 nm when the optical fiber is in the state of a bundle is 1.0 dB/km or less.

7. The optical fiber according to claim 4 ,
wherein a mode field diameter of the optical fiber at a wavelength of 1310 nm is 8.2 μm or more and 9.6 μm or less, and a cable cutoff wavelength is 1260 nm or less,
wherein an increase in loss at a wavelength of 1625 nm when the optical fiber is wound around a mandrel having a radius of 15 mm is 1.0 dB or less per 10 of winding number, and
wherein a difference between a transmission loss at a wavelength of 1550 nm when the optical fiber is wound at tensile strength of 80 g around a bobbin on which a metallic mesh material having a diameter of a longitudinal wire of 50 μm, a diameter of a lateral wire of 50 μm and a pitch of 150 μm is wound and a transmission loss at the wavelength of 1550 nm when the optical fiber is in the state of a bundle is 1.0 dB/km or less.

Assignees

• Sumitomo Electric Industries

Inventors

• Iwaguchi Noriaki
• OKUYAMA Haruki
• Yamaguchi Takahisa
• Fujii Takashi

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

• C03C25/105

  Organic claddings · CPC title

• C03C25/1065

  Multiple coatings · CPC title

• C03C25/326

  Polyureas; Polyurethanes · CPC title

• C03C25/40

  Organo-silicon compounds · CPC title