Flame retardant optical fiber cable

Patent metadata

Field	Value
Publication number	US-10845559-B2
Application number	US-201916693910-A
Country	US
Kind code	B2
Filing date	Nov 25, 2019
Priority date	May 30, 2017
Publication date	Nov 24, 2020
Grant date	Nov 24, 2020

Abstract

The present disclosure provides a flame retardant optical fiber cable. The flame retardant optical fiber cable includes a plurality of bundle binders. In addition, the flame retardant optical fiber cable includes a first layer, a second layer, a third layer, a fourth layer, a fifth layer, a sixth layer, a seventh layer and an eighth layer. The first layer surrounds a plurality of bundle binders. The second layer surrounds the first layer. The third layer surrounds the second layer. The fourth layer surrounds the third layer. The fifth layer surrounds the fourth layer. The sixth layer surrounds the fifth layer. The seventh layer surrounds the sixth layer. The eighth layer surrounds the seventh layer.

First claim

What is claimed is:

1. A flame retardant optical fiber cable comprising one or more of each of the following:
a plurality of bundle binders lying substantially along a longitudinal axis of the flame retardant optical fiber cable, wherein the plurality of bundle binders comprising a plurality of optical fibers;
one or more metallic loose tubes surrounding the plurality of bundle binder;
a first fire resistance mica tape layer;
a layer of water swellable yarns;
a layer of peripheral strength member;
a first jacket layer made of low smoke zero halogen;
a second fire resistance mica tape layer;
an armor layer;
a second jacket layer made of low smoke zero halogen.

2. The flame retardant optical fiber cable of claim 1 wherein the one or more metallic loose tubes is made up of steel.

3. The flame retardant optical fiber cable of claim 1 , wherein at least one of: the first fire resistance mica tape layer has two layers of the mica tape with at least 15 percent overlap helically wounded on the loose tube, the second fire resistance mica tape layer has two layers of the mica tape with at least 15 percent overlap helically wounded on the first jacket layer.

4. The flame retardant optical fiber cable of claim 1 , wherein the layer of peripheral strength member comprising a glass roving yarn, wherein at least one of: a first full coverage layer of glass roving yarn is placed helically in clockwise direction on the layer of water swellable yarns, a second full coverage layer of glass roving yarn is placed in anti-clockwise direction on the layer of water swellable yarns.

5. The flame retardant optical fiber cable of claim 1 , wherein the armored layer is substantially made of corrugated ECCS tape.

6. The flame retardant optical fiber cable of claim 1 , further comprising one or more pair of diagonally opposite rip cords, positioned at one or more interface: between the layer of peripheral strength member and the first jacket layer, between the second fire resistance mica tape layer and the armor layer.

7. The flame retardant optical fiber cable of claim 1 , wherein at least one or more of:
the flame retardant optical fiber cable is stressed for a first time period of about 60 minutes with the facilitation of flame at 930 degree Celsius with mechanical shocks,
the flame retardant optical fiber cable is further stressed for a second time period of about 60 minutes with the facilitation of water spray on the cable.

8. The flame retardant optical fiber cable of claim 1 , wherein the metallic loose tube has a first diameter in a range of 1.3 and 1.9 millimeters, a second diameter in a range of 1.7 and 2.3 millimeters, and a thickness in a range of 1.95 and 2.05 millimeters.

9. The flame retardant optical fiber cable of claim 1 , wherein the first fire resistance mica tape has a thickness in a range of 0.11 and 0.15 millimeters.

10. The flame retardant optical fiber cable of claim 1 , wherein the first jacket layer has a first diameter in a range of 7.0±0.3 millimetres, a second diameter in a range of 10.0±0.3 millimetres and a thickness in a range of 1.5±0.3 millimetres.

11. The flame retardant optical fiber cable of claim 1 , wherein the second fire resistance mica tape has a thickness in a range of 0.13±0.02 millimetre.

12. The flame retardant optical fiber cable of claim 1 , wherein the armor layer has a thickness in a range of 0.145±0.025 millimetre when the flame retardant optical fiber cable has at least one of 12 optical fibers, 24 optical fiber and 48 optical fibers.

13. The flame retardant optical fiber cable of claim 1 , wherein the second jacket layer has a first diameter in a range of 12.0±1.0 millimetres, a second diameter in a range of 16.0±1.0 millimetres and a thickness in a range of 2.0±0.3 millimetres when the flame retardant optical fiber cable has at least one of 12 optical fibers and 24 optical fibers.

14. The flame retardant optical fiber cable of claim 1 , wherein the second jacket layer has a first diameter in a range of 13.0±1.0 millimetres, a second diameter in a range of 17.0±1.0 millimetres and a thickness in a range of 2.0±0.3 millimetres when the flame retardant optical fiber cable comprises 48 fibers.

15. The flame retardant optical fiber cable of claim 1 , having one of:
a diameter in a range of about 16.0±1.0 millimetres, a weight of about 300±10% kilograms/kilometer when the flame retardant optical fiber cable has one of 12 optical fibers and 24 optical fibers, and
a diameter in a range of about 17.0±1.0 millimetre and a weight of about 345±10% kilograms/kilometer when the flame retardant optical fiber cable comprises 48 optical fibers.

16. The flame retardant optical fiber cable of claim 1 , having at least one of:
a withstanding temperature of at least 930 degree Celsius,
an impact strength of about 25 Newton meter,
a crush resistance of about 400 Newton per 10 centimeter,
a maximum tensile strength of about 3000 Newton, and
a kink radius of about 10 D, wherein D is the cable diameter of the flame retardant optical fiber cable.

17. A flame retardant optical fiber cable comprising one or more of each of the following:
a plurality of bundle binders lying substantially along a longitudinal axis of the flame retardant optical fiber cable, wherein the plurality of bundle binders comprising a plurality of optical fibers;
one or more metallic loose tubes surrounding the plurality of bundle binder; and
a first fire resistance mica tape layer, wherein the first fire resistance mica tape layer has two layers of the mica tape with at least 15 percent overlap.

18. The flame retardant optical fiber cable of claim 17 further comprising at least one of:
a layer of water swellable yarns;
a layer of peripheral strength member;
a first jacket layer made of low smoke zero halogen;
a second fire resistance mica tape layer;
an armor layer;
a second jacket layer made of low smoke zero halogen.

19. The flame retardant optical fiber cable of claim 17 , further comprising a second fire resistance mica tape having two layers of the mica tape with at least 15 percent overlap helically wounded on a jacket layer.

20. The flame retardant optical fiber cable of claim 17 , wherein the two layers of the mica tape of the first fire resistance mica tape with at least 15 percent overlap is helically wounded on the loose tube.

21. The flame retardant optical fiber cable of claim 17 , wherein the first fire resistance mica tape layer has a thickness in a range of about 0.13±0.02 mm.

22. The flame retardant optical fiber cable of claim 17 , wherein the one or more metallic loose tubes is made up of steel.

23. The flame retardant optical fiber cable of claim 17 , further comprising an armor layer, wherein the armor layer is substantially made of corrugated ECCS tape.

24. The flame retardant optical fiber cable of claim 17 , further comprising one or more pair of diagonally opposite rip cords, positioned at one or more interface: between the layer of peripheral strength member and the first jacket layer, between the second fire resistance mica tape layer and the armor layer.

25. The flame retardant optical fiber cable of claim 17 , having one of:
the flame retardant optical fiber cable is stressed for a first time period of about 60 minutes with the facilitation of flame at 930 degree Celsius with mechanical shocks,
the flame retardant optical fiber cable is further stressed for a second time period

Assignees

• Sterlite Tech Ltd

Inventors

• Sahoo Kishore
• Murthy Venkatesh
• Wagh Dnyaneshwar
• Senapati Sunil
• Pandey Ashutosh

Classifications

• G02B6/44384

  the means comprising water blocking or hydrophobic materials (G02B6/4439, G02B6/4479 take precedence) · CPC title

• G02B6/4432

  with fibre reinforcements · CPC title

• G02B6/441

  built up from sub-bundles (G02B6/4429, G02B6/4439, G02B6/4479 take precedence) · CPC title

• G02B6/4436 Primary

  Heat resistant · CPC title

• G02B6/4494

  Physics · mapped topic