# US 5,706,381 A · Non-rising submarine optical cable

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- Number: US 5,706,381 A
- Document ID: US5706381A
- Status: Granted
- Kind: A
- Application number: 08/646,322
- Filed: 1996-07-17
- Granted: 1998-01-06
- Earliest claimed: 1993-11-12
- Assignees: Siemens Aktiengesellschaft
- Inventors: Lothar Pokorny; Wolfgang Schrey; Ulrich Priesnitz; Ulrich Oestreich; Lienhard Schneider
- Web page: https://patentgrep.com/patent/US5706381A

## CPC

- G02B 6/4427: {Pressure resistant cables, e.g. undersea cables}
- G02B 6/4429: {Means specially adapted for strengthening or protecting the cables}
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## Abstract

The submarine optical cable has a basic structure which does not prevent rising up. Therefore, the cable is provided with at least one additional element which has a specific weight that is selected to be greater than 2.1 g/cm.sup.3 and prevents the rising up of the cable.

## Claims

### Claim 1

In a non-rising submarine optical cable with a cable construction with a basic structure having a low specific weight, which does not prevent rising up, the cable being provided with at least one additional element with a specific weight which is selected to be >2.1 g/cm.sup.3 and which prevents the rising up of the cable, the improvement comprising the additional element containing at least one metal oxide.

### Claim 2 (depends on 1)

In a non-rising submarine optical cable according to claim 1, wherein the additional element contains lead oxide.

### Claim 3 (depends on 2)

In a non-rising optical cable according to claim 2 wherein the metal oxide of the additional element is a mixture of lead oxide and iron oxide.

### Claim 4 (depends on 1)

In a non-rising submarine optical cable according to claim 1 wherein the additional element contains iron oxide.

### Claim 5 (depends on 1)

In a non-rising submarine optical cable according to claim 1, wherein the additional element contains a sintered compound.

### Claim 6 (depends on 1)

In a non-rising submarine optical cable according to claim 1, wherein a specific weight of the entire optical cable is selected to be >2.3 g/cm.sup.3.

### Claim 7 (depends on 1)

In a non-rising submarine optical cable according to claim 1, wherein the low specific weight of the basic structure of the optical cable without the additional element lies below 2.1 g/cm.sup.3.

### Claim 8 (depends on 1)

In a non-rising submarine optical cable according to claim 1, wherein the specific weight of the additional element is selected to be >3.5 g/cm.sup.3.

### Claim 9 (depends on 8)

In a non-rising optical cable according to claim 8, wherein the specific weight of the additional element is >4 g/cm.sup.3.

### Claim 10 (depends on 1)

In a non-rising submarine optical cable according to claim 1, wherein the additional element contains at least one powdered material embedded in a matrix.

### Claim 11 (depends on 10)

In a non-rising submarine optical cable according to claim 10, characterized in that wherein the matrix consists of a thermoplastic material.

### Claim 12 (depends on 1)

In a non-rising submarine optical cable according to claim 1, wherein the additional element is of tubular design.

### Claim 13 (depends on 1)

In a non-rising submarine optical cable according to claim 1, wherein the additional element is of a strand-shaped design.

### Claim 14 (depends on 1)

In a non-rising submarine optical cable according to claim 1, wherein the additional element is arranged within an outer sheath.