US2023393328A1PendingUtilityA1
Single-mode optical fiber with thin coating for high density cables and interconnects
Est. expiryJul 21, 2040(~14 yrs left)· nominal 20-yr term from priority
Inventors:Scott Robertson BickhamMatthew Ryan DrakeShandon Dee HartMing-Jun LiJoseph Edward MccarthyWeijun NiuPushkar Tandon
C03C 25/32C03C 25/1065G02B 6/02014G02B 6/02395G02B 6/0365G02B 6/4403G02B 6/02009
75
PatentIndex Score
0
Cited by
0
References
0
Claims
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
Claims
exact text as granted — not AI-modified1 - 20 . (canceled)
21 . 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; 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 As 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 microhend 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
c
s
(
E
s
E
p
,
R
s
,
t
s
)
,
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
2
5
[
(
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 R g is the radius of the glass, R is the outer radius of the high-modulus outer coating, t p is the thickness of the inner low-modulus coating, t s is the thickness of the high-modulus outer coating, E g is the elastic moduli of the glass, E p is the elastic moduli of the low-modulus inner coating, and E S is the elastic moduli of the high-modulus coating.
22 . The optical fiber of claim 21 , wherein the core region comprises silica glass doped with GeO 2 .
23 . The optical fiber of claim 22 , wherein the core region has a relative refractive index Δ 1max in the range from 0.25% to 0.40%.
24 . The optical fiber of claim 22 , wherein the core region has a radius ri in the range from 4.0 microns to 6.0 microns.
25 . The optical fiber of claim 21 , wherein the inner cladding region has a relative refractive index 42 in the range from −0.05% to 0.05%.
26 . The optical fiber of claim 21 , wherein the inner cladding region has a radius r 2 in the range from 9.0 microns to 15.0 microns.
27 . The optical fiber of claim 21 , wherein the cladding region further comprises a depressed-index cladding region between the inner cladding region and the outer cladding region, the depressed-index cladding region having a relative refractive index Δ 3 less than the relative refractive index Δ 2 of the inner cladding region and the relative refractive index Δ 4 of the outer cladding region.
28 . The optical fiber of claim 27 , wherein the depressed-index cladding region has a relative refractive index Δ 3 in the range from −0.30% to -0.80%.
29 . The optical fiber of claim 27 , wherein the depressed-index cladding region has a radius r 3 in the range from 14.0 microns to 18.0 microns.
30 . The optical fiber of claim 21 , wherein the outer cladding region has a radius r 4 in the range from 60.0 microns to 65.0 microns.
31 . The optical fiber of claim 21 , wherein the outer cladding region has a radius r 4 in the range from 61.0 microns to 64.0 microns.
32 . The optical fiber of claim 21 , wherein the outer cladding region has a radius r 4 in the range from 62.0 microns to 63.0 microns.
33 . The optical fiber of claim 21 , wherein the thickness of the high-modulus coating is in the range from 9 microns to 18 microns.
34 . The optical fiber of claim 21 , wherein the total thickness of the low-modulus coating and the high-modulus coating is 25 microns or less.
35 . The optical fiber of claim 21 , wherein the outer diameter of the coated optical fiber is between 155 microns and 175 microns.
36 . The optical fiber of claim 21 , wherein the outer diameter of the coated optical fiber is between 160 microns and 170 microns.
37 . The optical fiber of claim 21 , wherein the microbend attenuation penalty of the optical fiber is ≤0.01 dB/km.
38 . The optical fiber of claim 21 , wherein the microbend attenuation penalty of the optical fiber is ≤0.007 dB/km.
39 . The optical fiber of claim 21 , wherein the microbend attenuation penalty of the optical fiber is ≤0.003 dB/km.
40 . The optical fiber of claim 21 , wherein the puncture resistance of the optical fiber is ≥26 g.
41 . The optical fiber of claim 21 , wherein the puncture resistance of the optical fiber is ≥34 g.
42 . The optical fiber of claim 21 , wherein an attenuation of the optical fiber at 1550 nm is less than 0.20 dB/km.
43 . The optical fiber of claim 21 , wherein a mode field diameter of the optical fiber at 1310 nm is ≥8.6 microns.Join the waitlist — get patent alerts
Track US2023393328A1 — get alerts on status changes and closely related new filings.
We store only your email — no account needed. See our privacy policy.