Cylindrical enclosure for optical waveguide cable

Patent metadata

Field	Value
Publication number	US-10481359-B2
Application number	US-201816224793-A
Country	US
Kind code	B2
Filing date	Dec 19, 2018
Priority date	Feb 14, 2018
Publication date	Nov 19, 2019
Grant date	Nov 19, 2019

Abstract

The present disclosure provides an optical waveguide cable. The optical waveguide cable includes one or more optical waveguide bands positioned substantially along a longitudinal axis of the optical waveguide cable. The optical waveguide cable includes one or more layers substantially concentric to the longitudinal axis of the optical waveguide cable. The one or more layers include a cylindrical enclosure. The one or more optical waveguide bands include a plurality of light transmission elements. The density of the cylindrical enclosure is at most 0.935 gram per cubic centimeter. The optical waveguide cable has a waveguide factor of about 44%. The one or more optical waveguide bands are coupled longitudinally with the cylindrical enclosure.

First claim

What is claimed is:

1. An optical waveguide cable defined by a longitudinal axis passing through a geometrical center of the optical waveguide cable, the optical waveguide cable comprising:
one or more optical waveguide bands positioned substantially along the longitudinal axis of the optical waveguide cable, wherein each of the one or more optical waveguide bands has a plurality of light transmission elements, wherein the plurality of light transmission elements being made of silicon based glass; and
one or more layers substantially concentric to the longitudinal axis of the optical waveguide cable, wherein the one or more layers surround the one or more optical waveguide bands and wherein each of the one or more layers being substantially along the longitudinal axis of the optical waveguide cable, the one or more layers comprising:
a cylindrical enclosure positioned substantially along the longitudinal axis of the optical waveguide cable, wherein the cylindrical enclosure has density of at most 0.935 gram per cubic centimeter, wherein the cylindrical enclosure has a melt mass-flow rate of about 0.70 gram per 10 minutes and wherein the cylindrical enclosure ( 106 ) has a kink radius of about 4D.

2. The optical waveguide cable as recited in claim 1 , wherein the density is measured at a plurality of conditions, wherein the plurality of conditions comprises a temperature range of about 21 degree Celsius to 25 degree Celsius and a relative humidity of about 40% to 60%, wherein the plurality of conditions being required for at least 40 hours before the density of the cylindrical enclosure being measured and wherein the density of the cylindrical enclosure being at most 40% of density of the plurality of light transmission elements.

3. The optical waveguide cable as recited in claim 1 , wherein the one or more layers comprises a first water blocking element inside the cylindrical enclosure ( 106 ), wherein the first water blocking element surrounds the one or more optical waveguide bands.

4. The optical waveguide cable as recited in claim 1 , wherein the cylindrical enclosure is made of a medium density polyethylene material, wherein the medium density polyethylene material has an environmental stress cracking resistance of at least 500 hour, a tensile strength of about 4000 mega Pascal, a brittleness temperature of at most 100 degree Celsius and a tensile elongation at break of about 1000 percent.

5. The optical waveguide cable as recited in claim 1 , wherein the one or more optical waveguide bands is defined by a waveguide factor of about 44% and wherein the waveguide factor is a ratio of average cross-sectional area of the one or more optical waveguide bands to average cross-sectional area of the cylindrical enclosure wherein the one or more optical waveguide bands being coupled longitudinally with the cylindrical enclosure, and wherein at least one corner of the one or more optical waveguide bands being coupled with the one or more layers.

6. The optical waveguide cable as recited in claim 1 , wherein the protective cover is made of a medium density polyethylene material, wherein the medium density polyethylene material has a density of about 0.935 gram per cubic centimeter, a melt mass flow rate of about 0.70 gram per 10 minute, an environmental stress cracking resistance of at least 500 hour, a tensile strength of about 4000 mega Pascal, a brittleness temperature of at most 100 degree Celsius, and a tensile elongation at break of about 1000 percent.

7. The optical waveguide cable as recited in claim 1 further comprising a plurality of robust components, wherein the plurality of robust components being embedded inside the protective cover of the optical waveguide cable.

8. The optical waveguide cable as recited in claim 1 , wherein the one or more layers are selected from a group, wherein the group comprises a fire resistance tape, a water swellable tape layer, an ECCS armor layer, a glass roving yarn layer, a binder yarn layer and an aramid yarn layer.

9. The optical waveguide cable as recited in claim 1 , wherein the cylindrical enclosure is at a diagonal distance of about 0.9 millimeter from the one or more optical waveguide bands.

10. The optical waveguide cable as recited in claim 1 , wherein the plurality of light transmission elements has an attenuation change of at most 0.05 dB/km at a wavelength of about 1550 nanometer at a temperature range of −40 degree Celsius to +70 degree Celsius in a time period of 2 cycles with 12 hours per cycle, wherein the plurality of light transmission elements has a maximum attenuation of 0.36 dB/km at a wavelength of about 1310 nanometers at a temperature range of about 20 degree Celsius to 25 degree Celsius, wherein the plurality of light transmission elements has a maximum attenuation of 0.24 dB/km at a wavelength of about 1550 nanometers at the temperature range of about 20 degree Celsius to 25 degree Celsius, wherein the plurality of light transmission elements has a maximum attenuation of 0.26 dB/km at a wavelength of about 1625 nanometers at the temperature range of about 20 degree Celsius to 25 degree Celsius.

11. The optical waveguide cable as recited in claim 1 , wherein the one or more optical waveguide bands have a fill factor of about 0.445, wherein the plurality of light transmission elements has a fill factor of about 0.109.

Assignees

• Sterlite Tech Ltd

Inventors

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

Classifications

• G02B6/4403 Primary

  with ribbon structure (G02B6/4429, G02B6/4439, G02B6/4479 take precedence) · CPC title

• G02B6/4484

  with desired surplus length between fibres and protection features · CPC title

• G02B6/4402

  with one single optical waveguide (G02B6/4429, G02B6/4439, G02B6/4479 take precedence) · CPC title

• G02B6/4433

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

• G02B6/4434

  Central member to take up tensile loads · CPC title