# US 11,029,477 B2 · Optical fiber cable

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- Number: US 11,029,477 B2
- Document ID: US11029477B2
- Status: Granted
- Kind: B2
- Application number: 16/496,037
- Filed: 2018-03-19
- Published: 2020-02-06
- Granted: 2021-06-08
- Earliest claimed: 2017-03-21
- Assignees: Sumitomo Electric Industries, Ltd.
- Applicants: Sumitomo Electric Industries, Ltd.
- Inventors: Fumiaki Sato; Yoshiaki Nagao; Ryoei Oka; Ken Takahashi; Takao Hirama
- Web page: https://patentgrep.com/patent/US11029477B2

## CPC

- G02B 6/441: {built up from sub-bundles (G02B6/4429, G02B6/4439, G02B6/4479 take precedence)}
- G02B 6/02395: {Glass optical fibre with a protective coating, e.g. two layer polymer coating deposited directly on a silica cladding surface during fibre manufacture (G02B6/02052, G02B6/02057, G02B6/024, G02B6/032, G02B6/105, G02B6/14 take precedence; coating on fibre gratings G02B6/02104; multilayer core or cladding G02B6/036; reinforcing splice joints G02B6/2558; optical cables, i.e. comprising protective structures external to the protective coating such as a jacket or plural coated optical fibres G02B6/44; coating of glass to obtain optical fibres C03C25/104)}
- G02B 6/4403: {with ribbon structure (G02B6/4429, G02B6/4439, G02B6/4479 take precedence)}
- G02B 6/4432: {with fibre reinforcements}
- G02B 6/4434: {Central member to take up tensile loads}
- G02B 6/449: {Twisting}
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## Abstract

Provided is an optical fiber cable that is easier to be laid and enables higher-density packaging than an existing cable. This optical fiber cable is a slotless type optical fiber cable including: an optical unit formed by collecting and twisting a plurality of optical fibers or ribbons each formed by arranging the plurality of optical fibers; a cable core housing the optical unit; and a cable jacket provided around the cable core, and a tension member made of a fiber body within the cable core.

## Claims

### Claim 1

A slotless type optical fiber cable, comprising:
an optical unit formed by collecting and twisting a plurality of ribbon in which a plurality of optical fibers are arranged;
a cable core that accommodates the optical unit;
a cable jacket provided around the cable core; and
a tension member made of a fiber body in the cable core,
wherein the optical unit is formed of the ribbon, and
the ribbon is an intermittent ribbon in which a connection part and a non-connection part are intermittently formed in the longitudinal direction between the optical fibers adjacent to each other.

### Claim 2 (depends on 1)

The optical fiber cable according to claim 1, wherein
the fiber body is disposed at a central position of the cable core, and
an occupancy ratio of the optical unit calculated from a cross sectional area of the optical unit with respect to a cross sectional area of the cable core is equal to or greater than 25% or equal to or less than 65%.

### Claim 3 (depends on 1)

The optical fiber cable according to claim 1, wherein
the optical unit is formed of a plurality of subunits formed by twisting the plurality of ribbon, and
a plurality of glass fiber bodies are filled as the fiber body around the subunit.

### Claim 4 (depends on 3)

The optical fiber cable according to claim 3, wherein, the glass fiber body is an optical fiber not contributing to transmission.

### Claim 5 (depends on 1)

The optical fiber cable according to claim 1, wherein
the fiber body is formed of a glass fiber or an aramid-based fiber.

### Claim 6 (depends on 1)

The optical fiber cable according to claim 1, wherein
water absorbing powder is applied to the tension member.

### Claim 7 (depends on 1)

The optical fiber cable according to claim 1, wherein
the optical fiber is formed with a coating outer diameter applied to a glass fiber in the range of 135 μm to 220 μm.