US 2022/0026627 A1Published application

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

AssigneeCorning Incorporated

InventorsScott Robertson Bickham, Matthew Ryan Drake, Shandon Dee Hart, Ming-Jun Li, Joseph Edward McCarthy, Weijun Niu, Pushkar Tandon

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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

Claims20

Dependent claims

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 PR=P0+C1EsAs, wherein AS is the cross-sectional area of the high-modulus coating, wherein ES is the elastic moduli of the high-modulus coating, wherein P0 is a coefficient having a value of 11.3 g and C1 is a coefficient having a value of 2.1 g/MPa/mm2,
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 f0 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
R
s
)
3
]
0.375
⁢
{
E
s
E
p
⁡
[
R
s
4
-
(
R
s
-
t
s
)
4
]
}
0.625
,
wherein Rg is the radius of the glass, Rs is the outer radius of the high-modulus outer coating, tp is the thickness of the inner low-modulus coating, ts is the thickness of the high-modulus outer coating, Eg is the elastic moduli of the glass, Ep is the elastic moduli of the low-modulus inner coating, and ES is the elastic moduli of the high-modulus coating.

142 more elements

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 between about 45 microns and 55 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 6 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 12 microns to 18 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 30 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 PR=P0+C1EsAs, wherein AS is the cross-sectional area of the high-modulus coating, wherein ES is the elastic moduli of the high-modulus coating, wherein P0 is a coefficient having a value of 11.3 g and C1 is a coefficient having a value of 2.1 g/MPa/mm2,
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 f0 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
R
s
)
3
]
0.375
⁢
{
E
s
E
p
⁡
[
R
s
4
-
(
R
s
-
t
s
)
4
]
}
0.625
,
wherein Rg is the radius of the glass, Rs is the outer radius of the high-modulus outer coating, tp is the thickness of the inner low-modulus coating, ts is the thickness of the high-modulus outer coating, Eg is the elastic moduli of the glass, Ep is the elastic moduli of the low-modulus inner coating, and ES is the elastic moduli of the high-modulus coating.

142 more elements

Dependencies are inferred from the claim text.

Facts

Application: 17/381,756Filed 21 Jul 2021
Priority: 21 Jul 2020
Published: 27 Jan 2022
Term ends: Not estimatedThe source records don’t support an estimate.

Classification9 codes

G02B 6/02014
Large effective area or mode field radius, e.g. to reduce nonlinear effects in single mode fibres: effective area greater than 60 square microns…
G02B 6/0365
Having 3 layers only: arranged - - +
C03C 25/1065
To obtain optical fibres: multiple coatings
C03C 25/32
Macromolecular compounds or prepolymers: obtained otherwise than by reactions involving only carbon-to-carbon unsaturated bonds

Family

Application63/054,563Us provisional application · filed 21 Jul 2020
US 11,782,207 B2Related patent
US 2022/0026627 A1This patent

From the US filing history. Foreign family members aren’t listed.

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