Optical fiber ribbon duct cable

Patent metadata

Field	Value
Publication number	US-11143835-B2
Application number	US-201816108098-A
Country	US
Kind code	B2
Filing date	Aug 22, 2018
Priority date	Aug 23, 2017
Publication date	Oct 12, 2021
Grant date	Oct 12, 2021

Abstract

The present disclosure provides an optical fiber cable. The optical fiber cable includes a plurality of optical fibers lying substantially along a longitudinal axis of the optical fiber cable. Further, the optical fiber cable includes a first layer surrounding the plurality of optical fibers. Furthermore, the optical fiber cable includes a second layer surrounding the first layer. Furthermore, the optical fiber cable includes a third layer surrounding the second layer. Moreover, the optical fiber cable includes a fourth layer surrounding the third layer. The first layer is a water blocking tape. The second layer is a buffer tube layer made of polyethylene material and foamed with master batch. The third layer is a water blocking tape. The fourth layer is a sheath made of polyethylene material. Moreover, the fourth layer has a plurality of strength members embedded inside the fourth layer.

First claim

What is claimed is:

1. An optical fiber cable comprising:
a plurality of optical fibers lying substantially along a longitudinal axis of the optical fiber cable;
a plurality of layers surrounding the plurality of optical fibers, wherein each layer of the plurality of layers is concentric to each other; and
at least two pairs of strength members positioned diagonally to each other embedded in an outermost layer of the plurality of layers, wherein each of the at least two pairs of strength members include a first strength member and a second strength member;
wherein the first strength member in one pair among the at least two pairs of strength members is equal in size with the first strength member in other pair among the at least two pairs of strength members and the second strength member in the one pair among the at least two pairs of strength members is equal in size with the second strength member in the other pair among the at least two pairs of strength members, and wherein the first strength member and the second strength member in each pair of the at least two pairs of strength members are unequal in size,
wherein a distance between the first strength member and the second strength member in each pair of the at least two pairs of strength members is in a range of 0.1 millimeter to 0.4 millimeter.

2. The optical fiber cable as recited in claim 1 , wherein a diameter of the first strength member is in a range of 1.4 millimeters to 1.6 millimeters.

3. The optical fiber cable as recited in claim 1 , wherein the first strength member and the second strength member in each pair of the at least two pairs of strength members have different diameter.

4. The optical fiber cable as claimed in claim 1 , further comprising a plurality of ripcords positioned in the plurality of layers and extending along the longitudinal axis of the optical fiber cable.

5. The optical fiber cable as claimed in claim 1 , wherein the outermost layer has at least one of a thickness in a range of 2.5 millimeter to 3.5 millimeter, and a diameter in a range of 14 millimeters to 16 millimeter for the optical fiber cable having 144 fibers.

6. The optical fiber cable as claimed in claim 1 , wherein the first strength member and the second strength member in each pair of the at least two pairs of strength members are made up one or more of fiber reinforced plastic and steel wire.

7. The optical fiber cable as claimed in claim 1 , wherein an increase in the distance between the first strength member and the second strength member in each pair of the at least two pairs of strength members results in at least one of an increase in stiffness of the optical fiber cable and an increase in bend radius.

8. The optical fiber cable as recited in claim 1 , wherein each pair of the at least two pairs strength members is coated with ethylene acrylic acid.

9. The optical fiber cable as recited in claim 1 , wherein the plurality of optical fibers and a first layer of the plurality of layers is surrounded by a second layer of the plurality of layers, wherein the second layer is a buffer tube layer, wherein the second layer has a filling co-efficient of greater than 0.3 and wherein the filling co-efficient is a ratio of area of the plurality of optical fibers to a first area of the buffer tube.

10. The optical fiber cable as recited in claim 1 , wherein a first layer and a second layer of the plurality of layers is surrounded by a third layer of the plurality of layers, wherein the third layer is a water blocking tape and wherein the third layer has a thickness in a range of 0.2 millimeter to 0.3 millimeter.

11. The optical fiber cable as recited in claim 1 , wherein a diameter of the second strength member is in a range of 1.6 millimeters to 1.8 millimeters.

12. The optical fiber cable as claimed in claim 1 , wherein a first layer of the plurality of layers is surrounded by a second layer of the plurality of layers, wherein the second layer is made of a polyethylene material and a foaming master batch, wherein the foaming master batch is a chemical foaming agent used to reduce weight of the second layer, wherein the foaming master batch is processed at a temperature of at least 220 degree centigrade.

13. The optical fiber cable as claimed in claim 1 , wherein a first layer of the plurality of layers is surrounded by a second layer of the plurality of layers, wherein the second layer has at least one of a thickness in a range of 0.6 millimeter to 0.8 millimeter, and a diameter in a range of 7.6 millimeters to 8.0 millimeters for the optical fiber cable having 144 fibers.

14. The optical fiber cable as claimed in claim 1 , wherein a first layer of the plurality of layers is surrounded by a second layer of the plurality of layers, wherein the second layer is having a weight in a range of 8.86 kilograms to 20.43 kilograms when the second layer is made by using foaming agent master batch with the polyethylene material.

Assignees

• Sterlite Tech Ltd

Inventors

• Kumar Sravan
• Sahoo Kishore
• Murthy Venkatesh
• Mishra Atul
• Moturu Pavan
• Shinde Gahininath
• Deshpande Mahesh
• Tenzing Kangabam

Classifications

• G02B6/4404 Primary

  Multi-podded · CPC title

• G02B6/4433

  Double reinforcement laying in straight line with optical transmission element · CPC title

• G02B6/567

  for ribbon cables · CPC title

• G02B6/44384 Primary

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

• G02B6/4494 Primary

  Physics · mapped topic