OPTICAL FIBER

• US 20170031092A1
• Filed: 05/12/2015
• Published: 02/02/2017
• Est. Priority Date: 05/14/2014
• Status: Active Grant

• Current Assignee: Sumitomo Electric Industries Limited (Sumitomo Corporation)
• Original Assignee: Sumitomo Electric Industries Limited (Sumitomo Corporation)
• Inventors: KAWANO, Takehiko, SOHMA, Kazuyuki, IWAGUCHI, Noriaki, FUJII, Takashi
• Granted Patent: US 9,746,605 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G02B 6/02009 Large effective area or mode field radius, e.g. to reduce nonlinear effects in single mode fibres
• CPC Class Codes: G02B 6/02019 Effective area greater than 90 square microns in the C band, i.e. 1530-1565 nm
• CPC Class Codes: G02B 6/02395 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 Class Codes: G02B 6/4402 with one single optical waveguide G02B6/4429, G02B6/4439, G02B6/4479 take precedence

Abstract

An optical fiber IA comprises an optical transmission member 10 including a core 12 and a clad 14, a primary resin layer 22, and a secondary resin layer 24. The effective area of the optical transmission member 10 is 130 μm² or larger. The transmission loss of the optical transmission member 10 at a wavelength of 1550 nm is 0.165 dB/km or smaller. The Young'"'"'s modulus of the primary resin layer 22 is 0.7 MPa or lower, and the Young'"'"'s modulus of the secondary resin layer 24 is 600 MPa or higher and 1500 MPa or lower. The difference between the transmission loss when the optical fiber 1A is wound at a tension of 80 g around a bobbin on which a metal mesh member having vertical wires of a 50-μm diameter and horizontal wires of a 50-μm diameter are wound and spaced at a pitch of 150 μm, and the transmission loss of an optical fiber coil is 1.0 dB/km or smaller.

Claims

1. An optical fiber comprising:

an optical transmission member including a core and a clad;

a primary resin layer contacting with the optical transmission member and coating the optical transmission member; and

a secondary resin layer coating the primary resin layer,

wherein an effective area of the optical transmission member is 130 μ

m² or larger, a transmission loss of the optical transmission member at a wavelength of 1550 nm is 0.165 dB/km or smaller,

a Young'"'"'s modulus of the primary resin layer is 0.7 MPa or lower, a Young'"'"'s modulus of the secondary resin layer is 600 MPa or higher and 1500 MPa or lower,

an outer diameter of the primary resin layer is 185 vim or longer and 220 μ

m or shorter, an outer diameter of the secondary resin layer is 225 vim or longer and 260 μ

m or shorter, and

a difference between the transmission loss when the optical fiber is wound at a tension of 80 g around a bobbin on which a metal mesh member having vertical wires of a 50-μ

m diameter and horizontal wires of a 50-vim diameter are wound and spaced at a pitch of 150 μ

m, and the transmission loss of an optical fiber coil is 1.0 dB/km or smaller,

the primary resin layer comprises urethane oligomers including a di-reactive termini oligomer and a mono-reactive terminus oligomer, and

the mono-reactive terminus oligomer is included at 50% or more in the primary resin.

2. The optical fiber according to claim 1,

wherein the effective area of the optical transmission member is 140 μ

m² or larger, and the Young'"'"'s modulus of the primary resin layer is 0.5 MPa or lower.

3. The optical fiber according to claim 1,

wherein the effective area of the optical transmission member is 150 μ

m² or larger, and the Young'"'"'s modulus of the primary resin layer is 0.3 MPa or lower.

4. The optical fiber according to claim 1,

wherein a time until the transmission loss difference of the optical fiber to the optical fiber coil become 0.003 dB/km or smaller from a point when the optical fiber has been just wound around the bobbin is 2000 hours or shorter.

5. The optical fiber according to claim 1,

wherein the urethane oligomers include a residue of hydroxyethyl acrylate.