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

Patent metadata

Field	Value
Publication number	US-2022026627-A1
Application number	US-202117381756-A
Country	US
Kind code	A1
Filing date	Jul 21, 2021
Priority date	Jul 21, 2020
Publication date	Jan 27, 2022
Grant date	—

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 σ 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

• G02B6/02395

  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

• G02B6/02009

  Large effective area or mode field radius, e.g. to reduce nonlinear effects in single mode fibres · CPC title