Single-mode optical fiber with thin coating for high density cables and interconnects

Patent metadata

Field	Value
Publication number	US-11782207-B2
Application number	US-202117381756-A
Country	US
Kind code	B2
Filing date	Jul 21, 2021
Priority date	Jul 21, 2020
Publication date	Oct 10, 2023
Grant date	Oct 10, 2023

Abstract

An optical fiber is provided that includes a core region, a cladding region having a radius less than about 62.5 microns; a polymer coating comprising a high-modulus layer and a low-modulus layer, wherein a thickness of the low-modulus inner coating layer is in a range of 4 microns to 20 microns, the modulus of the low-modulus inner coating layer is less than or equal to about 0.35 MPa, a thickness of the high-modulus coating layer is in a range of 4 microns to 20 microns, the modulus of the high-modulus inner coating layer is greater than or equal to about 1.6 GPa, and wherein a puncture resistance of the optical fiber is greater than 20 g, and wherein a microbend attenuation penalty of the optical fiber is less than 0.03 dB/km, and wherein an outer diameter of the coated optical fiber is less than or equal to 175 microns.

First claim

What is claimed is:

1. An optical fiber, comprising:
a core region;
a cladding region surrounding the core region, the cladding region comprising:
an inner cladding directly adjacent to the core region, and an outer cladding surrounding the inner cladding, wherein a radius of the cladding region is less than about 62.5 microns; and
a polymer coating comprising a high-modulus coating layer surrounding the cladding region and a low-modulus coating layer disposed between the cladding region and the high-modulus coating layer, wherein a thickness of the low-modulus inner coating layer is in a range of 4 microns to 20 microns, the modulus of the low-modulus inner coating layer is less than or equal to about 0.35 MPa, a thickness of the high-modulus coating layer is in a range of 4 microns to 20 microns, the modulus of the high-modulus inner coating layer is greater than or equal to about 1.6 GPa, and wherein a puncture resistance of the optical fiber is greater than 20 g, and wherein a microbend attenuation penalty of the optical fiber is less than 0.03 dB/km, and wherein an outer diameter of the coated optical fiber is less than or equal to 175 microns,
wherein the puncture resistance of the optical fiber is calculated by equation P R =P 0 +C 1 E s A s , wherein A S is the cross-sectional area of the high-modulus coating, wherein E S is the elastic moduli of the high-modulus coating, wherein P 0 is a coefficient having a value of 11.3 g and C 1 is a coefficient having a value of 2.1 g/MPa/mm 2 ,
wherein the microbend attenuation penalty of the optical fiber is calculated by equation:

MAP
=

C
0

⁢

f
0

⁢
σ
⁢

f
RIP

⁢

f
g

⁡

(

E
g

,

R
g

)

⁢

f
p

⁡

(

E
p

,

t
p

)

f
cs

⁡

(

E
s

E
p

,

R
g

,

t
g

)

,

 wherein f 0 is the average lateral pressure of the external surface in contact with the high modulus coating, wherein s is the standard deviation of the roughness of the external surface in contact with the high modulus coating, wherein

C
0

=

4
×

10
25

⁡

[

(

π
4

)

2.625

]

-
1

,

 and wherein

f
g

=

1

E
g
2

⁢

R
g
6

,

 and wherein

f
p

=

E
p

t
p
2

,

 and wherein

f
cs

=

[

1
+

E
s

E
p

⁢

(

t
s

Assignees

• Corning Inc

Inventors

• Bickham Scott Robertson
• Drake Matthew Ryan
• Hart Shandon Dee
• Li Ming-Jun
• Mccarthy Joseph Edward
• Niu Weijun
• Tandon Pushkar

Classifications

• C03C25/32

  obtained otherwise than by reactions involving only carbon-to-carbon unsaturated bonds · CPC title

• C03C25/1065

  Multiple coatings · CPC title

• G02B6/02014 Primary

  Effective area greater than 60 square microns in the C band, i.e. 1530-1565 nm · CPC title

• G02B6/02395

  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 title

• G02B6/0365 Primary

  arranged - - + · CPC title