GB2073440A - Optical cable - Google Patents

Optical cable Download PDF

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Publication number
GB2073440A
GB2073440A GB8109567A GB8109567A GB2073440A GB 2073440 A GB2073440 A GB 2073440A GB 8109567 A GB8109567 A GB 8109567A GB 8109567 A GB8109567 A GB 8109567A GB 2073440 A GB2073440 A GB 2073440A
Authority
GB
United Kingdom
Prior art keywords
cable
metal parts
sheathing
rings
metal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
GB8109567A
Other versions
GB2073440B (en
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
International Standard Electric Corp
Original Assignee
International Standard Electric Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by International Standard Electric Corp filed Critical International Standard Electric Corp
Publication of GB2073440A publication Critical patent/GB2073440A/en
Application granted granted Critical
Publication of GB2073440B publication Critical patent/GB2073440B/en
Expired legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/46—Processes or apparatus adapted for installing or repairing optical fibres or optical cables
    • G02B6/56—Processes for repairing optical cables
    • G02B6/562—Processes for repairing optical cables locatable, e.g. using magnetic means
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
    • G02B6/4439—Auxiliary devices

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Insulated Conductors (AREA)
  • Communication Cables (AREA)

Abstract

A cable (1) including optical fibres (2) and non-metallic other members, such as strength members (3, 4) and sheathing (6) is difficult to locate when buried. Spaced metallic parts (7) are therefore provided in or on the cable sheathing (6) to facilitate detection of the cable by a conventional cable locating device. The metallic parts may also consist of rings, or gapped rings, encircling the cable. <IMAGE>

Description

SPECIFICATION Optical cable The invention relates to a cable including at least one optical fibre.
A cable of this type is known, for example, from DE-OS 2541178. This known cable includes, around a central strength member, optical fibres as well as further strength members. Over these there is arranged a taping of a plastics film which is surrounded by the cable sheathing normally consisting of polyvinylchloride or polyethylene. This cable includes no metal parts, so that no unwanted short circuits to ground occur during the use thereof, and no electrical longitudinal voltages can be induced but, on the other hand, the cable is also no longer capable of being located.
It is an object of the present invention to provide a cable including at least one optical fibre which, when buried or the like, is capable of being found by using a cable-locating device.
According to the present invention there is provided a cable including at least one optical fibre and distributed metal parts.
The cable according to the present invention is capable of being located without sacrificing the aforementioned advantages of an optical cable which is free from metal. Moreover, the invention can be realized on various types of cable structures.
Embodiments of the present invention will now be described with reference to Figures 1 and 2 of the accompanying drawings which illustrate two examples of cables having distributed metal parts.
Figure 1 shows a cable 1 including three optical fibres 2 stranded around a central strength member 3 together with three further strength members 4.
On this there is arranged a taping 5 consisting of a film of a soft plastics material which, in turn, is surrounded by a cable sheathing 6. Three optical fibres are shown only by way of example, because the cable may also include any other number of optical fibres. The cable also does not need to be provided with an internal strength member, because external strength members may be used equally well. This means to imply that any suitable cable structure can be used.
The cable sheathing 6 is shown to be provided with metallized areas 7 which, for example, may consist of a powder or of a foil. It is also possible to arrange metal parts in the form of small pieces, in a distributed manner in the cable sheathing 6. The metal parts arranged in the cable sheathing 6 may also consist of filaments or wires which are not in contact with one another.
It is of importance with respect to the insertion or application of the metal parts into or to the cable, respectively, to ensure that these metal parts do not touch each other and form a longer electrically conducting path.
Figure 2 shows the same type of cable as Figure 1.
Therefore, identical parts are also indicated by the same reference numerals. In this example the cable 1 comprises metal rings 8 which are let into its cable sheathing 6. These metal rings 8 may have different widths, and several of these rings may also be arranged next to each other. If so required, the metal rings 8 may also have a transverse gap that is, be incomplete rings, in order thugs not to represent short-circuit rings.
1. A cable including at least one optical fibre and distributed metal parts.
2. A cable as claimed in claim 1, wherein the metal parts are arranged in the cable sheathing.
3. A cable as claimed in claim 1, wherein the metal parts consist of metallized areas arranged on the cable sheathing.
4. A cable as claimed in claim 2, wherein the metal parts consist of short metallic filaments which are not in contact with one another.
5. A cable as claimed in claim 1, wherein the metal parts consist of metal rings.
6. A cable including at least one optical fibre and substantially as herein described with reference to and as illustrated in Figure 1 or Figure 2 of the accompanying drawings.
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (6)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Optical cable The invention relates to a cable including at least one optical fibre. A cable of this type is known, for example, from DE-OS 2541178. This known cable includes, around a central strength member, optical fibres as well as further strength members. Over these there is arranged a taping of a plastics film which is surrounded by the cable sheathing normally consisting of polyvinylchloride or polyethylene. This cable includes no metal parts, so that no unwanted short circuits to ground occur during the use thereof, and no electrical longitudinal voltages can be induced but, on the other hand, the cable is also no longer capable of being located. It is an object of the present invention to provide a cable including at least one optical fibre which, when buried or the like, is capable of being found by using a cable-locating device. According to the present invention there is provided a cable including at least one optical fibre and distributed metal parts. The cable according to the present invention is capable of being located without sacrificing the aforementioned advantages of an optical cable which is free from metal. Moreover, the invention can be realized on various types of cable structures. Embodiments of the present invention will now be described with reference to Figures 1 and 2 of the accompanying drawings which illustrate two examples of cables having distributed metal parts. Figure 1 shows a cable 1 including three optical fibres 2 stranded around a central strength member 3 together with three further strength members 4. On this there is arranged a taping 5 consisting of a film of a soft plastics material which, in turn, is surrounded by a cable sheathing 6. Three optical fibres are shown only by way of example, because the cable may also include any other number of optical fibres. The cable also does not need to be provided with an internal strength member, because external strength members may be used equally well. This means to imply that any suitable cable structure can be used. The cable sheathing 6 is shown to be provided with metallized areas 7 which, for example, may consist of a powder or of a foil. It is also possible to arrange metal parts in the form of small pieces, in a distributed manner in the cable sheathing 6. The metal parts arranged in the cable sheathing 6 may also consist of filaments or wires which are not in contact with one another. It is of importance with respect to the insertion or application of the metal parts into or to the cable, respectively, to ensure that these metal parts do not touch each other and form a longer electrically conducting path. Figure 2 shows the same type of cable as Figure 1. Therefore, identical parts are also indicated by the same reference numerals. In this example the cable 1 comprises metal rings 8 which are let into its cable sheathing 6. These metal rings 8 may have different widths, and several of these rings may also be arranged next to each other. If so required, the metal rings 8 may also have a transverse gap that is, be incomplete rings, in order thugs not to represent short-circuit rings. CLAIMS
1. A cable including at least one optical fibre and distributed metal parts.
2. A cable as claimed in claim 1, wherein the metal parts are arranged in the cable sheathing.
3. A cable as claimed in claim 1, wherein the metal parts consist of metallized areas arranged on the cable sheathing.
4. A cable as claimed in claim 2, wherein the metal parts consist of short metallic filaments which are not in contact with one another.
5. A cable as claimed in claim 1, wherein the metal parts consist of metal rings.
6. A cable including at least one optical fibre and substantially as herein described with reference to and as illustrated in Figure 1 or Figure 2 of the accompanying drawings.
GB8109567A 1980-04-01 1981-03-26 Optical cable Expired GB2073440B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE3012638A DE3012638C2 (en) 1980-04-01 1980-04-01 Fiber optic cable with means to enable location

Publications (2)

Publication Number Publication Date
GB2073440A true GB2073440A (en) 1981-10-14
GB2073440B GB2073440B (en) 1983-09-14

Family

ID=6098989

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8109567A Expired GB2073440B (en) 1980-04-01 1981-03-26 Optical cable

Country Status (2)

Country Link
DE (1) DE3012638C2 (en)
GB (1) GB2073440B (en)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4693551A (en) * 1983-10-05 1987-09-15 U.S. Holding Company, Inc. Dielectric strength elements for loose tube optical fiber cable
GB2193583A (en) * 1986-08-07 1988-02-10 Telephone Cables Ltd Optical cables
US4787695A (en) * 1985-12-24 1988-11-29 Herzl Laor Optical fiber connector and assembly method thereof
FR2755767A1 (en) * 1996-11-14 1998-05-15 Telecommunications Sa Position Detection Technique for Underground Optical Cables
EP1191354A1 (en) * 2000-09-20 2002-03-27 Dipl.-Ing. Dr. Ernst Vogelsang GmbH & Co. KG Device for identifying and/or locating buried cables for optical information exchange, in particular opticle fibre cables
WO2007113544A1 (en) * 2006-04-03 2007-10-11 British Telecommunications Public Limited Company Cable installation detection
US8587327B2 (en) 2007-12-28 2013-11-19 British Telecommunications Public Limited Company Cable installation using induction
US8702064B2 (en) 2007-12-28 2014-04-22 British Telecommunications Public Limited Company Cable installation using optical detection
US8720030B2 (en) 2009-03-31 2014-05-13 British Telecommunications Public Limited Company Blown cable apparatus and method
US8775102B2 (en) 2009-03-19 2014-07-08 British Telecommunications Public Limited Company Passive remote detection of gas flow and cable arrival
US9774175B2 (en) 2008-09-26 2017-09-26 British Telecommunications Public Limited Company Cable installation apparatus
US10247896B2 (en) 2010-03-26 2019-04-02 British Telecommunications Public Limited Company Optical fiber apparatus

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2541178C2 (en) * 1975-09-16 1982-12-09 Standard Elektrik Lorenz Ag, 7000 Stuttgart Optical cable

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4693551A (en) * 1983-10-05 1987-09-15 U.S. Holding Company, Inc. Dielectric strength elements for loose tube optical fiber cable
US4787695A (en) * 1985-12-24 1988-11-29 Herzl Laor Optical fiber connector and assembly method thereof
GB2193583A (en) * 1986-08-07 1988-02-10 Telephone Cables Ltd Optical cables
US4822133A (en) * 1986-08-07 1989-04-18 Telephone Cables Limited Optical cables
GB2193583B (en) * 1986-08-07 1990-05-16 Telephone Cables Ltd Optical cables
FR2755767A1 (en) * 1996-11-14 1998-05-15 Telecommunications Sa Position Detection Technique for Underground Optical Cables
EP1191354A1 (en) * 2000-09-20 2002-03-27 Dipl.-Ing. Dr. Ernst Vogelsang GmbH & Co. KG Device for identifying and/or locating buried cables for optical information exchange, in particular opticle fibre cables
WO2007113544A1 (en) * 2006-04-03 2007-10-11 British Telecommunications Public Limited Company Cable installation detection
US9762039B2 (en) 2006-04-03 2017-09-12 British Telecommunications Public Limited Company Cable installation detection
US8587327B2 (en) 2007-12-28 2013-11-19 British Telecommunications Public Limited Company Cable installation using induction
US8702064B2 (en) 2007-12-28 2014-04-22 British Telecommunications Public Limited Company Cable installation using optical detection
US9774175B2 (en) 2008-09-26 2017-09-26 British Telecommunications Public Limited Company Cable installation apparatus
US8775102B2 (en) 2009-03-19 2014-07-08 British Telecommunications Public Limited Company Passive remote detection of gas flow and cable arrival
US8720030B2 (en) 2009-03-31 2014-05-13 British Telecommunications Public Limited Company Blown cable apparatus and method
US10247896B2 (en) 2010-03-26 2019-04-02 British Telecommunications Public Limited Company Optical fiber apparatus

Also Published As

Publication number Publication date
DE3012638A1 (en) 1981-10-08
GB2073440B (en) 1983-09-14
DE3012638C2 (en) 1981-12-17

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PCNP Patent ceased through non-payment of renewal fee