Multi loose tube ribbon cable

Patent metadata

Field	Value
Publication number	US-11262522-B2
Application number	US-201816224759-A
Country	US
Kind code	B2
Filing date	Dec 18, 2018
Priority date	Dec 18, 2018
Publication date	Mar 1, 2022
Grant date	Mar 1, 2022

Abstract

The present disclosure provides an optical fiber cable. The optical fiber cable includes at least one optical fiber ribbon stack. In addition, the at least one optical fiber ribbon stack includes a plurality of stacked ribbons. Further, each ribbon of the plurality of stacked ribbons includes a plurality of optical fibers. The plurality of optical fibers includes edge fibers. The edge fibers are defined as the at least one optical fiber having a mach number of at most 7.2 disposed at a first end and a second end of a first ribbon and a last ribbon of the plurality of stacked ribbons.

First claim

What is claimed is:

1. An optical fiber cable comprising:
at least one optical fiber ribbon stack, wherein the at least one optical fiber ribbon stack comprises a plurality of stacked ribbons, wherein each ribbon of the plurality of stacked ribbons comprises
a plurality of optical fibers, wherein the plurality of optical fibers comprises edge fibers, wherein the edge fibers are disposed at a first end and a second end of a first ribbon and a last ribbon of the plurality of stacked ribbons and the edge fibers have a MAC number of at most 7.2; and
a plurality of buffer tubes, wherein each of the plurality of buffer tubes comprises an optical fiber ribbon stack of the at least one optical fiber ribbon stack, wherein a difference between a first diameter of each of the plurality of buffer tubes and a diagonal distance of the corresponding optical fiber ribbon stack constitutes a gap upto 0.35 millimeter, wherein each of the plurality of buffer tubes has a maximum shrinkage of 11.29%.

2. The optical fiber cable as claimed in claim 1 , wherein each of the plurality of buffer tubes is made of a thermoplastic material and has a thickness of 30 millimetres and wherein each of the plurality of buffer tubes has a first diameter in a range of 6.8±0.2 millimetres.

3. The optical fiber cable as claimed in claim 1 , wherein each of the plurality of optical fibers has a polarization mode dispersion of less than 0.2 ps/√km.

4. The optical fiber cable as claimed in claim 1 , wherein each of the plurality of optical fibers has a final maximum cabled fiber attenuation of 0.13 dB/Km at a wavelength of 1550 nanometer after second cycle.

5. The optical fiber cable as claimed in claim 1 , wherein each of the plurality of optical fibers has a final maximum cabled fiber attenuation of 0.285 dB/Km at a wavelength of 1625 nanometer after second cycle.

6. The optical fiber cable as claimed in claim 1 , wherein the plurality of optical fibers has a total number of fibers selected from a group, wherein the group comprises 864 fibers, 576 fibers and 432 fibers.

7. The optical fiber cable as claimed in claim 1 , wherein the plurality of stacked ribbons inside each of the plurality of buffer tubes comprises 4 edge fibers.

8. The optical fiber cable as claimed in claim 1 , wherein each of the plurality of optical fibers has a maximum cabled fiber attenuation of 0.4 dB/Km at a wavelength of 1310 nanometer and 1625 nanometer, wherein each of the plurality of optical fibers has a maximum cabled fiber attenuation of 0.3 dB/Km at a wavelength of 1550 nanometre.

9. The optical fiber cable as claimed in claim 1 , wherein each of the plurality of buffer tubes comprising a water swellable tape having a thickness of 0.15±0.05 millimetres, wherein the water swellable tape inside each of the plurality of buffer tubes has an overlap of 4 millimetres with the corresponding buffer tube.

10. The optical fiber cable as claimed in claim 1 , further comprising:
a central strength member, wherein the central strength member is made of a fiber reinforced plastic;
a first layer, wherein the first layer surrounds the central strength member, wherein the first layer is a water blocking tape;
a second layer, wherein the second layer surrounds one or more buffer tubes, wherein the second layer is a binder and a water swellable tape;
a third layer, wherein the third layer surrounds the second layer, wherein the third layer is made of UV proof black polyethylene material; and
a plurality of ripcords positioned in between the second layer and the third layer.

11. The optical fiber cable as claimed in claim 1 , wherein the optical fiber cable has a weight of 420 kilogram, wherein the optical fiber cable has a short term tensile strength of 2700 Newton, wherein the optical fiber cable has a long term tensile strength of 890 Newton, wherein the optical fiber cable has an impact strength of 25 Newton metre, wherein the optical fiber cable has a torsion of ±180°, wherein the optical fiber cable has a crush resistance of 2200 Newton/100 millimetres, wherein the optical fiber cable has a minimum bending radius of 20 D during installation and wherein the optical fiber cable has a minimum bending radius of 15 D during operation.

12. The optical fiber cable as claimed in claim 1 , further comprising a plurality of fillers, wherein each of the plurality of fillers is made of a fiber reinforced plastic up coated with a polyethylene material.

Assignees

• Sterlite Tech Ltd

Inventors

• Kumar Sravan
• Sahoo Kishore
• Chintada Kavya
• Murthy Venkatesh
• Mishra Atul
• Moturu Pavan
• Tenzing Kangabam

Classifications

• G02B6/44384 Primary

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

• G02B6/4431

  with provision in the protective covering, e.g. weak line, for gaining access to one or more fibres, e.g. for branching or tapping (break-out terminations G02B6/4471) · CPC title

• G02B6/4434

  Central member to take up tensile loads · CPC title

• G02B6/4404 Primary

  Multi-podded · CPC title

• G02B6/4494 Primary

  Physics · mapped topic