GB1586373A – Optical fibre cable
– Google Patents
GB1586373A – Optical fibre cable
– Google Patents
Optical fibre cable
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Info
Publication number
GB1586373A
GB1586373A
GB568778A
GB568778A
GB1586373A
GB 1586373 A
GB1586373 A
GB 1586373A
GB 568778 A
GB568778 A
GB 568778A
GB 568778 A
GB568778 A
GB 568778A
GB 1586373 A
GB1586373 A
GB 1586373A
Authority
GB
United Kingdom
Prior art keywords
tube
optical
optical fibre
fibre
fibres
Prior art date
1977-02-25
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.)
Expired
Application number
GB568778A
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.)
Kabel Rheydt AG
Original Assignee
AEG Telefunken Kabelwerke AG
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.)
1977-02-25
Filing date
1978-02-13
Publication date
1981-03-18
1978-02-13
Application filed by AEG Telefunken Kabelwerke AG
filed
Critical
AEG Telefunken Kabelwerke AG
1981-03-18
Publication of GB1586373A
publication
Critical
patent/GB1586373A/en
Status
Expired
legal-status
Critical
Current
Links
Espacenet
Global Dossier
Discuss
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
G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
G02B6/4401—Optical cables
G02B6/4402—Optical cables with one single optical waveguide
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
G02B6/4401—Optical cables
G02B6/441—Optical cables built up from sub-bundles
G02B6/4414—Optical cables built up from sub-bundles with internal serpentine waveguides
Description
(54) OPTICAL FIBRE CABLE
(71) We, AEG-TELEFUNKEN Kabelwerke Aktiengesellschaft, Rheydt, of Monchengladbach, Federal Republic of Germany, a German body corporate, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement:
The invention relates to optical fibre cable made from a sturdy tube with an optical fibre or fibre group lying therein.
Fibres made of a material which is suited to transmitting light in the infra-red, visible, ultraviolet range or in a part of these ranges of the electromagnetic spectrum are understood as optical fibres in the present context. The optical fibres can be surrounded by a protective casing in order to protect their surfaces. In the first instance, optical fibres of this type serve to transmit information.
Optical fibres are very vulnerable mechanically. Therefore, they are arranged in protective casings either individually or several at a time for further processing, laying and installation. These arrangements of optical fibres are called optical fibre cables in the present context. They can serve either directly or only after applying appropriate external casings as transmission lines. But they can so be twisted together as optical twisting elements and thus can form the core of a multi fibre optical cable. During twisting, the twisted elements are subjected to high bending and tension loads. Even when laying and assembling the cable later, bending and tension loading occur which act on the photoconductor arrangement. Thus the optical fibres contained in the cable can be damaged or limited in their quality of transmission.
It is known to arrange these fibres loosely in tube-like casings absorbing the mechanical loads in order to keep bending and tension loads arising during twisting of the photoconductor arrangements away from the optical fibres. The optical fibres lie in the tube-like casings and are freely movable. This type of photo-conductor arrangement is known from German Offenlegungsschrift No. 25 56 861. A disadvantage of this known optical fibre cable lies in the fact that it must be wound on to a drum after manufacture. When winding it on to the drum, the optical fibres do not however remain at the centre point of the tube but lie inside the tube against the wall which is closest to the centre point of the drum. If this cable is now extended for twisting, the fibres are shorter than the tube and therefore are stretched and this often leads to breakage of the fibres.
The present invention seeks to provide an optical fibre cable which retains the advantages of a loose casing for the optical fibres in which casing the optical fibres are reliably protected from tension and compressionloads in which winding on to the drum after manufacture does not lead to differences in length between the tube casing and the optical fibres. The photoconductor arrangement should be capable of being wound on to the drum after manufacture and being extended again without danger of breakage.
According to the invention, there is provided an optical fibre cable comprising a tube and optical fibre cable comprising a tube and an optical fibre element in the tube, the optical fibre element following a helical path about the centre of the tube and being supported so as not to touch the tube wall.
In preferred manner, one or more strands made of cushioning material and wound helically round the optical fibre or fibre group can be provided as the support element. The support elements or strands may comprise fibrous material. It has been proved that woollen threads are very good for this purpose. The optical fibres of a fibre group may be arranged in the photoconductor arrangement in accordance with the invention in untwisted manner.
In order to manufacture the photoconductor arrangement in accordance with the invention, a support thread may be spitally wound round the optical fibre or fibre group, this thread comprising wool, for example, and the tube may then be extruded around this arrangement. The optical fibre with the wool thread twisted round it may be introduced into a longitudinally cut tube which is then closed again or closes itself. This method of insertion of strands into tubes is described in our West German
OLS No. 26 51 725. It is in fact known to provide helical spacers in electrical coaxial cables which keep the internal conductor on the axis of the external conductor. With the photoconductor arrangement in accordance with the invention, the optical fibres do not lie in a coaxial position however but are wound slightly eccentrically round the tube axis. The very rigid connection of the external conductor to the internal conductor caused by the spacers in coaxial cables does not permit any conclusions to be drawn as to the advantages of the design proposed in accordance with the invention, in which design, the optical fibre may be supported by a fibrous woollen helix and may be positioned freely about the tube axis and may thus be particularly suited to a photoconductor arrangement.
The invention offers the advantage that the optical fibres are not freely movable in the tube but are kept in a line which rotates helically about the tube axis by a predetermined eccentricity. As a result, the optical fibres are prevented from abutting a wall of the tube during winding up on to the drum and are prevented from leading to differences in length which can lead to breakage of the optical fibres when the photoconductor arrangement is extended. The advantages of the loose arrangement of the optical fibres are retained, however, since the support elements provided do not restrict the mobility of the fibres in the tube. The low bearing force of the support elements on the fibres permits relative movement in the longitudinal direction with regard to the arrangement. When a radial pressure arises on the tube, the fibres have sufficient room to deflect. The arrangement in accordance with the invention permits processing of optical fibres without a casing.
An example of embodiment of the invention is shown in the drawings. It shows a view and four sections at different points through the photoconductor arrangement.
The optical fibre or fibre group is designated 2. A woollen thread 3 winds helically round the optical fibre the thread supporting the fibre at a spacing from the inner wall of the tube 1 and giving it a path which is wound slightly eccentrically and spirally round the tube axis 4. The four cross-section
A to D show the eccentric position of the optical fibres in four different positions. It can be seen that the optical fibre rotates round the tube axis in a longitudinal direction with a small radius.
WHAT WE CLAIM IS;
1. An optical fibre cable comprising a tube and an optical fibre element in the tube, the optical fibre element following a helical path about the centre of the tube and being supported so as not to touch the tube wall.
2. A cable according to Claim 1, wherein the optical fibre element is a single optical fibre.
3. A cable according to Claim 1, wherein the optical fibre element is a group of optical fibres.
4. A cable according to Claim 1 or 3, wherein the optical fibre or fibre group is kept in its position wound helically round the tube axis by support elements made from a cushioning material.
5. A cable according to Claim 4, wherein a strand wound helically round the optical fibre or fibre group and made of cushioning material is provided as the support element.
6. A cable according to Claim 4 or 5, wherein the support elements or the strand comprise fibrous material.
7. A cable according to Claim 6, wherein the strand is a woollen thread.
8. A photoconductor arrangement according to Claim 3 or any claim apparent directly or indirectly thereto, wherein the optical fibres of a fibre group are not twisted together.
9. An optical fibre cable substantially as described herein with reference to the drawings.
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (9)
**WARNING** start of CLMS field may overlap end of DESC **. for this purpose. The optical fibres of a fibre group may be arranged in the photoconductor arrangement in accordance with the invention in untwisted manner. In order to manufacture the photoconductor arrangement in accordance with the invention, a support thread may be spitally wound round the optical fibre or fibre group, this thread comprising wool, for example, and the tube may then be extruded around this arrangement. The optical fibre with the wool thread twisted round it may be introduced into a longitudinally cut tube which is then closed again or closes itself. This method of insertion of strands into tubes is described in our West German OLS No. 26 51 725. It is in fact known to provide helical spacers in electrical coaxial cables which keep the internal conductor on the axis of the external conductor. With the photoconductor arrangement in accordance with the invention, the optical fibres do not lie in a coaxial position however but are wound slightly eccentrically round the tube axis. The very rigid connection of the external conductor to the internal conductor caused by the spacers in coaxial cables does not permit any conclusions to be drawn as to the advantages of the design proposed in accordance with the invention, in which design, the optical fibre may be supported by a fibrous woollen helix and may be positioned freely about the tube axis and may thus be particularly suited to a photoconductor arrangement. The invention offers the advantage that the optical fibres are not freely movable in the tube but are kept in a line which rotates helically about the tube axis by a predetermined eccentricity. As a result, the optical fibres are prevented from abutting a wall of the tube during winding up on to the drum and are prevented from leading to differences in length which can lead to breakage of the optical fibres when the photoconductor arrangement is extended. The advantages of the loose arrangement of the optical fibres are retained, however, since the support elements provided do not restrict the mobility of the fibres in the tube. The low bearing force of the support elements on the fibres permits relative movement in the longitudinal direction with regard to the arrangement. When a radial pressure arises on the tube, the fibres have sufficient room to deflect. The arrangement in accordance with the invention permits processing of optical fibres without a casing. An example of embodiment of the invention is shown in the drawings. It shows a view and four sections at different points through the photoconductor arrangement. The optical fibre or fibre group is designated 2. A woollen thread 3 winds helically round the optical fibre the thread supporting the fibre at a spacing from the inner wall of the tube 1 and giving it a path which is wound slightly eccentrically and spirally round the tube axis 4. The four cross-section A to D show the eccentric position of the optical fibres in four different positions. It can be seen that the optical fibre rotates round the tube axis in a longitudinal direction with a small radius. WHAT WE CLAIM IS;
1. An optical fibre cable comprising a tube and an optical fibre element in the tube, the optical fibre element following a helical path about the centre of the tube and being supported so as not to touch the tube wall.
2. A cable according to Claim 1, wherein the optical fibre element is a single optical fibre.
3. A cable according to Claim 1, wherein the optical fibre element is a group of optical fibres.
4. A cable according to Claim 1 or 3, wherein the optical fibre or fibre group is kept in its position wound helically round the tube axis by support elements made from a cushioning material.
5. A cable according to Claim 4, wherein a strand wound helically round the optical fibre or fibre group and made of cushioning material is provided as the support element.
6. A cable according to Claim 4 or 5, wherein the support elements or the strand comprise fibrous material.
7. A cable according to Claim 6, wherein the strand is a woollen thread.
8. A photoconductor arrangement according to Claim 3 or any claim apparent directly or indirectly thereto, wherein the optical fibres of a fibre group are not twisted together.
9. An optical fibre cable substantially as described herein with reference to the drawings.
GB568778A
1977-02-25
1978-02-13
Optical fibre cable
Expired
GB1586373A
(en)
Applications Claiming Priority (1)
Application Number
Priority Date
Filing Date
Title
DE19772708878
DE2708878C3
(en)
1977-02-25
1977-02-25
Light guide arrangement
Publications (1)
Publication Number
Publication Date
GB1586373A
true
GB1586373A
(en)
1981-03-18
Family
ID=6002492
Family Applications (1)
Application Number
Title
Priority Date
Filing Date
GB568778A
Expired
GB1586373A
(en)
1977-02-25
1978-02-13
Optical fibre cable
Country Status (7)
Country
Link
JP
(1)
JPS6044642B2
(en)
DE
(1)
DE2708878C3
(en)
FI
(1)
FI74823C
(en)
FR
(1)
FR2382016A1
(en)
GB
(1)
GB1586373A
(en)
IT
(1)
IT1092811B
(en)
NL
(1)
NL7801130A
(en)
Families Citing this family (8)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
DE2854717A1
(en)
*
1978-12-18
1980-06-19
Aeg Telefunken Kabelwerke
Optical conductor resistant to mechanical forces – has tension relief rope wound around optical fibre group in stabilising sleeve between optical fibre and sleeve
DE2911421A1
(en)
*
1979-03-23
1980-09-25
Aeg Telefunken Kabelwerke
Optical conductor with glass fibre reinforced plastics outer sleeve – comprising two interfitting trough-shaped shells or hollow tube and containing loosely enclosed optical fibre protected against rupture
DE2913054A1
(en)
*
1979-03-31
1980-10-09
Aeg Telefunken Kabelwerke
Optical light guide cable – protects glass fibres by specified thermoplastic carrier and pull relief layers
DE3023669C2
(en)
*
1980-06-25
1983-01-20
Philips Kommunikations Industrie AG, 8500 Nürnberg
Self-supporting optical communication cable
DE3318233C2
(en)
*
1983-05-19
1985-10-31
Philips Patentverwaltung Gmbh, 2000 Hamburg
Optical cable element or cable and method for its manufacture
FR2551253B1
(en)
*
1983-08-26
1986-06-06
Lignes Telegraph Telephon
TRANSMISSION CABLE, ESPECIALLY OPTICAL, COMPRISING AN ELASTIC ELEMENT
DE8515470U1
(en)
*
1985-05-25
1985-12-19
Felten & Guilleaume Energietechnik Gmbh, 5000 Koeln
Power cables, especially for voltages from 6 to 60 kV, with inserted optical fibers
DE3808828A1
(en)
*
1988-03-14
1989-09-28
Heinz Konsolke
LIGHT CONDUCTORS FROM A COILED, PLASTIC-COVERED FLOWER
Family Cites Families (2)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
JPS50153946A
(en)
*
1974-06-03
1975-12-11
JPS51133040A
(en)
*
1975-05-14
1976-11-18
Sumitomo Electric Ind Ltd
Heat resisting electric wire
1977
1977-02-25
DE
DE19772708878
patent/DE2708878C3/en
not_active
Expired
1978
1978-02-01
FI
FI780325A
patent/FI74823C/en
not_active
IP Right Cessation
1978-02-01
JP
JP53009367A
patent/JPS6044642B2/en
not_active
Expired
1978-02-01
NL
NL7801130A
patent/NL7801130A/en
not_active
Application Discontinuation
1978-02-13
GB
GB568778A
patent/GB1586373A/en
not_active
Expired
1978-02-22
IT
IT2052278A
patent/IT1092811B/en
active
1978-02-24
FR
FR7805433A
patent/FR2382016A1/en
active
Granted
Also Published As
Publication number
Publication date
FR2382016A1
(en)
1978-09-22
NL7801130A
(en)
1978-08-29
FI74823C
(en)
1988-03-10
FI780325A
(en)
1978-08-26
IT7820522D0
(en)
1978-02-22
DE2708878B2
(en)
1979-06-07
IT1092811B
(en)
1985-07-12
DE2708878C3
(en)
1980-02-07
DE2708878A1
(en)
1978-08-31
JPS6044642B2
(en)
1985-10-04
JPS53106143A
(en)
1978-09-14
FR2382016B1
(en)
1984-03-09
FI74823B
(en)
1987-11-30
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Legal Events
Date
Code
Title
Description
1981-06-03
PS
Patent sealed
1995-10-11
PCNP
Patent ceased through non-payment of renewal fee
Effective date:
19950213
