# US 10,481,359 B2 · Cylindrical enclosure for optical waveguide cable

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- Number: US 10,481,359 B2
- Document ID: US10481359B2
- Status: Granted
- Kind: B2
- Application number: 16/224,793
- Filed: 2018-12-19
- Published: 2019-08-15
- Granted: 2019-11-19
- Earliest claimed: 2018-02-14
- Assignees: Sterlite Technologies Limited
- Applicants: Sterlite Technologies Limited
- Inventors: Venkatesh Murthy; Kishore Sahoo; Sravan Kumar peraka; Atul Mishra; Pavan Kumar Moturu; Kavya Chintada
- Web page: https://patentgrep.com/patent/US10481359B2

## CPC

- G02B 6/44384: {the means comprising water blocking or hydrophobic materials (G02B6/4439, G02B6/4479 take precedence)}
- G02B 6/4402: {with one single optical waveguide (G02B6/4429, G02B6/4439, G02B6/4479 take precedence)}
- G02B 6/4403: {with ribbon structure (G02B6/4429, G02B6/4439, G02B6/4479 take precedence)}
- G02B 6/4432: {with fibre reinforcements}
- G02B 6/4433: {Double reinforcement laying in straight line with optical transmission element}
- G02B 6/4434: {Central member to take up tensile loads}
- G02B 6/4431: {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)}
- G02B 6/4484: {with desired surplus length between fibres and protection features}
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## 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.

## Claims

### Claim 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.

### Claim 2 (depends on 1)

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.

### Claim 3 (depends on 1)

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.

### Claim 4 (depends on 1)

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.

### Claim 5 (depends on 1)

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.

### Claim 6 (depends on 1)

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.

### Claim 7 (depends on 1)

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.

### Claim 8 (depends on 1)

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.

### Claim 9 (depends on 1)

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.

### Claim 10 (depends on 1)

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.

### Claim 11 (depends on 1)

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.