Flame retardant optical fiber cable

Patent metadata

Field	Value
Publication number	US-10527808-B2
Application number	US-201815942224-A
Country	US
Kind code	B2
Filing date	Mar 30, 2018
Priority date	May 30, 2017
Publication date	Jan 7, 2020
Grant date	Jan 7, 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:
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;
a first layer surrounding the plurality of bundle binders, wherein the first layer is a loose tube, wherein the first layer is substantially made of steel;
a second layer surrounding the first layer;
a third layer surrounding the second layer;
a fourth layer surrounding the third layer, wherein the fourth layer is a peripheral strength member;
a fifth layer surrounding the fourth layer, wherein the fifth layer is a first jacket layer;
a sixth layer surrounding the fifth layer;
a seventh layer surrounding the sixth layer, wherein the seventh layer is an armoring layer; and
an eighth layer surrounding the seventh layer, wherein the eighth layer is a second jacket layer,
wherein the flame retardant optical fiber cable withstands a temperature of at least 930 degree Celsius.

2. The flame retardant optical fiber cable as claimed in claim 1 , wherein the second layer is substantially made of a mica tape, wherein the third layer is substantially made of water swellable yarns, wherein the fourth layer is substantially made of glass roving yarns, wherein the fifth layer is substantially made of low smoke zero halogen material, wherein the sixth layer is substantially made of a mica tape, wherein the seventh layer is substantially made of a corrugated ECCS tape, wherein the eighth layer is substantially made of low smoke zero halogen material.

3. The flame retardant optical fiber cable as claimed in claim 1 further comprising a plurality of ripcords, wherein the plurality of ripcords comprises a first plurality of ripcords and a second plurality of ripcords, wherein the first plurality of ripcords is positioned at an interface of the fourth layer and the fifth layer, wherein the second plurality of ripcords is positioned at an interface of the sixth layer and the seventh layer.

4. The flame retardant optical fiber cable as claimed in claim 1 , wherein 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, wherein 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.

5. The flame retardant optical fiber cable as claimed in claim 1 , wherein the first layer has a first diameter in a range of about 1.6±0.3 millimeters, a second diameter in a range of about 2.0±0.3 millimeters, a thickness in a range of about 2.00±0.05 millimeters, wherein the second layer has a thickness in a range of about 0.13±0.02 millimeter, wherein the fifth layer has a first diameter in a range of about 7.0±0.3 millimeters, a second diameter in a range of about 10.0±0.3 millimeters and a thickness in a range of about 1.5±0.3 millimeters, wherein the sixth layer has a thickness in a range of about 0.13±0.02 millimeter, wherein the seventh layer has a thickness in a range of about 0.145±0.025 millimeter when the flame retardant optical fiber cable has one of 12 optical fibers, 24 optical fiber and 48 optical fibers.

6. The flame retardant optical fiber cable as claimed in claim 1 , wherein the eighth layer has a first diameter in a range of about 12.0±1.0 millimeters, a second diameter in a range of about 16.0±1.0 millimeters and a thickness in a range of about 2.0±0.3 millimeters when the flame retardant optical fiber cable has one of 12 optical fibers and 24 optical fibers, wherein the eighth layer has a first diameter in a range of about 13.0±1.0 millimeters, a second diameter in a range of about 17.0±1.0 millimeters and a thickness in a range of about 2.0±0.3 millimeters when the flame retardant optical fiber cable comprises 48 fibers.

7. The flame retardant optical fiber cable as claimed in claim 1 , wherein the flame retardant optical fiber cable has a diameter in a range of about 16.0±1.0 millimeters and 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, wherein the flame retardant optical fiber cable has a diameter in a range of about 17.0±1.0 millimeter and a weight of about 345±10% kilograms/kilometer when the flame retardant optical fiber cable comprises 48 optical fibers.

8. The flame retardant optical fiber cable as claimed in claim 1 , wherein the flame retardant optical fiber cable has impact strength of about 25 Newton meter, wherein the flame retardant optical fiber cable has a crush resistance of about 400 Newton per 10 centimeter, wherein the flame retardant optical fiber cable has a maximum tensile strength of about 3000 Newton, wherein the flame retardant optical fiber cable has a kink radius of about 10 D, wherein D is the cable diameter of the flame retardant optical fiber cable.

9. A flame retardant optical fiber cable comprising:
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;
a first layer surrounding the plurality of bundle binders, wherein the first layer is a loose tube, wherein the first layer is substantially made of steel;
a second layer surrounding the first layer;
a third layer surrounding the second layer;
a fourth layer surrounding the third layer, wherein the fourth layer is a peripheral strength member;
a fifth layer surrounding the fourth layer, wherein the fifth layer is a first jacket layer;
a sixth layer surrounding the fifth layer;
a seventh layer surrounding the sixth layer, wherein the seventh layer is an armoring layer;
an eighth layer surrounding the seventh layer, wherein the eighth layer is a second jacket layer; and
a plurality of ripcords, wherein the plurality of ripcords comprises a first plurality of ripcords and a second plurality of ripcords, wherein the first plurality of ripcords is positioned at an interface of the fourth layer and the fifth layer, wherein the second plurality of ripcords is positioned at an interface of the sixth layer and the seventh layer,
wherein the flame retardant optical fiber cable withstands a temperature of at least 930 degree Celsius, and
wherein 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, wherein 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.

10. The flame retardant optical fiber cable as claimed in claim 9 , wherein the second layer is substantially made of a mica tape, wherein the third layer is substantially made of water swellable yarns, wherein the fourth layer is substantially made of glass roving yarns, wherein the fifth layer is substantially made of low smoke zero halogen material, wherein the sixth layer is substantially made of a mica tape, wherein the seventh layer is substantially made of a corrugated ECCS tape, wherein the eighth layer is substantially made of low smoke zero halogen material.

11. The flame retardant optical fiber cable as claimed in claim 9 , wherein the first layer has a first diameter in a range of about 1.6±0.3 millimeters, a second diameter in a range of about 2.0±0.3 millimeters, a thickness in a range of about 2.00±0.05 millimeters, wherein the second layer has a thickness in a range of about 0.13±0.02 millimeter, wherein the fifth layer has a

Assignees

• Sterlite Tech Ltd

Inventors

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

Classifications

• G02B6/4436 Primary

  Heat resistant · CPC title

• G02B6/441

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

• G02B6/4432

  with fibre reinforcements · CPC title

• G02B6/4494

  Physics · mapped topic

• G02B6/44384

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