Dual layer micro optical fiber cable

Patent metadata

Field	Value
Publication number	US-10641982-B1
Application number	US-201916262890-A
Country	US
Kind code	B1
Filing date	Jan 30, 2019
Priority date	Dec 6, 2018
Publication date	May 5, 2020
Grant date	May 5, 2020

Abstract

The present disclosure provides an optical fiber cable (100). The optical fiber cable (100) includes a first layer (108) and a second layer (110). The second layer (110) surrounds the first layer (108). The first layer (108) includes a first plurality of buffer tubes (122). The second layer (110) comprises a second plurality of buffer tubes (124). Each buffer tube of the first plurality of buffer tubes (122) and the second plurality of buffer tubes (124) has a thickness of at most 0.15 millimeter. Each buffer tube of the first plurality of buffer tubes (122) and the second plurality of buffer tubes (124) includes a first material layer (126) and a second material layer (128). The second material layer (128) surrounds the first material layer (126). The first material layer (126) is made of polybutylene terephthalate. The second material layer (128) is made of polycarbonate.

First claim

What is claimed is:

1. An optical fiber cable for installation in micro ducts comprising:
a central strength member ( 106 ) lying substantially along a longitudinal axis ( 104 ) of the optical fiber cable ( 100 ), wherein the longitudinal axis ( 104 ) passes through a geometrical center ( 102 ) of the optical fiber cable ( 100 );
a first layer ( 108 ) encapsulating a first one or more optical fibers, wherein the first layer ( 108 ) comprises a first plurality of buffer tubes ( 122 ), wherein the first layer ( 108 ) surrounds the central strength member ( 106 );
a second layer ( 110 ) encapsulating a second one or more optical fibers, wherein the second layer ( 110 ) comprises a second plurality of buffer tubes ( 124 ), wherein the second layer ( 110 ) surrounds the first layer ( 108 );
a third layer ( 112 ) surrounding the second layer ( 110 ), wherein the third layer ( 112 ) is made of a plurality of binder yarns; and
a fourth layer ( 114 ) surrounding the third layer ( 112 ), wherein the fourth layer ( 114 ) is a jacket layer,
wherein each buffer tube of the first plurality of buffer tubes ( 122 ) and the second plurality of buffer tubes ( 124 ) comprises a thickness of at most 0.15 millimeter, wherein each buffer tube of the first plurality of buffer tubes ( 122 ) and the second plurality of buffer tubes ( 124 ) comprises a first material layer ( 126 ) and a second material layer ( 128 ), wherein the second material layer ( 128 ) surrounds the first material layer ( 126 ), wherein the first material layer ( 126 ) is made of polybutylene terephthalate, wherein the second material layer ( 128 ) is made of polycarbonate, wherein the first material layer ( 126 ) comprises a thickness of about 75 microns, wherein the second material layer ( 128 ) comprises a thickness of about 75 microns, to increase a crush resistance of the optical fiber cable,
wherein the optical fiber cable ( 100 ) has an overall diameter in a range of 8.6 millimeters to 9.2 millimeters and a weight of 70 kilogram per kilometer enabling better blowing performance of the optical fiber cable ( 100 ), wherein the optical fiber cable ( 100 ) can be blown up to 1000 meters in 12 mm duct and up to 1500 meters in 14 mm duct.

2. The optical fiber cable as claimed in claim 1 , wherein the polybutylene terephthalate and polycarbonate prevents indentation in each of the sleeves of the first plurality of sleeves and the second plurality of sleeves.

3. The optical fiber cable as claimed in claim 1 , wherein the central strength member comprises a diameter of 1.8 millimeter±0.05 millimeter.

4. The optical fiber cable as claimed in claim 1 , wherein each sleeve of the first plurality of sleeves and the second plurality of sleeves comprises a first diameter of 1.25 millimeter and a second diameter of about 1.55 millimeter with a tolerance of ±0.025 millimeter.

5. The optical fiber cable as claimed in claim 1 , wherein the first layer comprises a thickness of 75 microns and the second material layer comprises a thickness of 75 microns resulting in a total thickness of each sleeve of the first plurality of sleeves and the second plurality of sleeves of 0.15 millimeter with a tolerance of ±0.025 millimeter.

6. The optical fiber cable as claimed in claim 3 , wherein the fourth layer is a jacket layer made of polyethylene having density in a range of 0.926 gram/centimeter 3 -0.971 gram/centimeter 3 and polypropylene material comprising a density in a range of 0.90 gram/centimeter 3 -0.92 gram/centimeter 3 .

7. The optical fiber cable as claimed in claim 1 , wherein each sleeve in the first plurality of sleeves and the second plurality of sleeves comprises a thickness in a range of 0.15 millimeter±0.025 millimeter.

8. The optical fiber cable as claimed in claim 3 , wherein the optical fiber cable comprises a plurality of water swellable yarns positioned over the central strength member.

9. The optical fiber cable as claimed in claim 1 , wherein the optical fiber cable comprises the plurality of ripcords to facilitate stripping of the optical fiber cable.

10. The optical fiber cable as claimed in claim 1 , wherein the optical fiber cable comprises, a crush resistance of 500 Newton per 10 centimeter, a tensile strength of 1000 Newton, and an impact strength of 2 Newton meter.

11. The optical fiber cable as claimed in claim 1 , wherein the optical fiber cable comprises a bending radius of about 20 D during installation of the optical fiber cable and comprises a bending radius of about 15 D after installation of the optical fiber cable.

12. The optical fiber cable as claimed in claim 1 , the optical fiber cable comprises upto 432 optical fibers.

13. The optical fiber cable as claimed in claim 1 , wherein the first one or more optical fiber and the second one or more optical fiber comprises a diameter of 200 microns.

14. The optical fiber cable as claimed in claim 3 , wherein the central strength member is made of fiber reinforced plastic.

15. The optical fiber cable as claimed in claim 1 , the optical fiber cable is easy to install micro duct cable.

Assignees

• Sterlite Tech Ltd

Inventors

• Kumar Sravan
• Sahoo Kishore
• Mishra Atul
• Shukla Vikash

Classifications

• G02B6/4438

  for facilitating insertion by fluid drag in ducts or capillaries · CPC title

• G02B6/52

  using fluid, e.g. air · CPC title

• G02B6/4494 Primary

  Physics · mapped topic

• G02B6/4497

  Physics · mapped topic

• G02B6/44384

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