# US 10,120,152 B1 · All dielectric self-supporting fiber optic cable

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 10,120,152 B1
- Document ID: US10120152B1
- Status: Granted
- Kind: B1
- Application number: 15/894,972
- Filed: 2018-02-13
- Granted: 2018-11-06
- Earliest claimed: 2018-02-13
- Assignees: Superior Essex International LP
- Applicants: Superior Essex International LP
- Inventors: Christopher Robert Evans
- Web page: https://patentgrep.com/patent/US10120152B1

## CPC

- G02B 6/4434: {Central member to take up tensile loads}
- G02B 6/4413: {Helical structure}
- G02B 6/4433: {Double reinforcement laying in straight line with optical transmission element}
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## Abstract

An all-dielectric self-supporting (ADSS) cable may include a central strength member and a plurality of buffer tubes helically wrapped around the central member. Each of the plurality of buffer tubes may house at least one optical fiber, and an outer jacket may surround the plurality of buffer tubes and the central strength member. Additionally the central strength member may include a plurality of different strength layers including a first layer formed from relatively flexible material and a second layer formed from relatively rigid material.

## Claims

### Claim 1

An all-dielectric self-supporting (ADSS) cable, comprising:
a central strength member comprising:
a first layer having a flexural modulus greater than 500 MPa: and
a second layer comprising a plurality of strength yarns helically twisted around the first layer, the second layer having a flexural modulus less than 10 MPa and an elastic modulus greater than 600 MPa;
a plurality of buffer tubes helically wrapped around the central strength member, each of the plurality of buffer tubes housing at least one optical fiber; and
an outer jacket surrounding the plurality of buffer tubes and the central strength member.

### Claim 2 (depends on 1)

The ADSS cable of claim 1, wherein the plurality of strength yarns comprise aramid strength yarns.

### Claim 3 (depends on 1)

The ADSS cable of claim 1, wherein the plurality of strength yarns comprise at least one of (i) basalt fiber, (ii) ultra-high-molecular weight polyethylene, or (iii) fiberglass.

### Claim 4 (depends on 1)

The ADSS cable of claim 1, wherein the first layer comprises glass reinforced plastic.

### Claim 5 (depends on 1)

The ADSS cable of claim 1, further comprising a strength layer formed around the plurality of buffer tubes.

### Claim 6

An all-dielectric self-supporting (ADSS) cable, comprising:
a central strength member comprising:
a first layer comprising a rigid material having a flexural modulus greater than 500 MPa; and
a second layer comprising a plurality of strength yarns helically twisted around the first layer, the second layer having a flexural modulus less than 10 MPa, the plurality of strength yarns comprising at least one of (i) aramid yarn, (ii) basalt fiber, (iii) ultra-high molecular weight polyethylene, or (iv) fiberglass;
a plurality of buffer tubes helically wrapped around the central strength fiber, each of the plurality of buffer tubes housing at least one optical fiber; and
an outer jacket surrounding the plurality of buffer tubes and the central strength member.

### Claim 7 (depends on 6)

The ADSS cable of claim 6, wherein the plurality of strength yarns comprise an elastic modulus greater than 600 MPa.

### Claim 8 (depends on 6)

The ADSS cable of claim 6, wherein the plurality of strength yarns comprise a plurality of aramid yarns.

### Claim 9 (depends on 6)

The ADSS cable of claim 6, wherein the plurality of strength yarns have a flexural modulus less than 10 MPa.

### Claim 10 (depends on 6)

The ADSS cable of claim 6, wherein the first layer comprises glass reinforced plastic.

### Claim 11 (depends on 6)

The ADSS cable of claim 6, further comprising a strength layer formed around the plurality of buffer tubes.

### Claim 12

An all-dielectric self-supporting (ADSS) cable, comprising:
a central strength member comprising:
a first layer comprising a plurality of strength yarns helically twisted together; and
a second layer comprising a rigid material having flexural modulus greater than 500 MPa formed around the first layer;
a plurality of buffer tubes helically wrapped around the central strength member, each of the plurality of buffer tubes housing at least one optical fiber; and
an outer jacket surrounding the plurality of buffer tubes and the central strength member.

### Claim 13 (depends on 12)

The ADSS cable of claim 12, wherein the second layer comprises glass reinforced plastic.

### Claim 14 (depends on 13)

The ADSS cable of claim 13, wherein the plurality of strength yarns comprises a first plurality of strength yarns, and wherein the central strength member further comprises a third layer formed around the second layer, the third layer comprising second plurality of strength yarns.

### Claim 15 (depends on 14)

The ADSS cable of claim 14, wherein the second plurality of strength yarns are helically twisted around the second layer.

### Claim 16 (depends on 12)

The ADSS cable of claim 12, further comprising a strength layer formed around the plurality of buffer tubes.

### Claim 17 (depends on 12)

The ADSS cable of claim 12, wherein the first layer has a flexural modulus less than 10 MPa.

### Claim 18 (depends on 12)

The ADSS cable of claim 12, wherein the first layer has an elastic modulus greater than 600 MPa.

### Claim 19 (depends on 12)

The ADSS cable of claim 12, wherein the plurality of strength yarns comprise aramid yarns.

### Claim 20 (depends on 12)

The ADSS cable of claim 12, wherein the plurality of strength yarns comprise at least one of (i) basalt fiber, (ii) ultra-high-molecular weight polyethylene, or (iii) fiberglass.