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GB2159291A - Optical fibre cables - Google Patents

Optical fibre cables Download PDF

Info

Publication number
GB2159291A
GB2159291A GB08506496A GB8506496A GB2159291A GB 2159291 A GB2159291 A GB 2159291A GB 08506496 A GB08506496 A GB 08506496A GB 8506496 A GB8506496 A GB 8506496A GB 2159291 A GB2159291 A GB 2159291A
Authority
GB
United Kingdom
Prior art keywords
cushioned
sheath
bundles
optical fibre
fibre
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.)
Withdrawn
Application number
GB08506496A
Other versions
GB8506496D0 (en
Inventor
Clifford Heywood
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.)
Telephone Cables Ltd
Original Assignee
Telephone Cables Ltd
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 Telephone Cables Ltd filed Critical Telephone Cables Ltd
Publication of GB8506496D0 publication Critical patent/GB8506496D0/en
Publication of GB2159291A publication Critical patent/GB2159291A/en
Withdrawn legal-status Critical Current

Links

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
    • G02B6/4429—Means specially adapted for strengthening or protecting the cables
    • G02B6/4434—Central member to take up tensile loads
    • 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
    • G02B6/4413—Helical structure
    • 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
    • G02B6/4429—Means specially adapted for strengthening or protecting the cables
    • G02B6/443—Protective covering
    • G02B6/4432—Protective covering with fibre reinforcements
    • 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
    • G02B6/4429—Means specially adapted for strengthening or protecting the cables
    • G02B6/44384—Means specially adapted for strengthening or protecting the cables the means comprising water blocking or hydrophobic materials

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)

Abstract

An optical cable in which a bundle of optical fibres (1) is enclosed within a cushion sheath (2) of foamed plastic and surrounded by a plastics strengthening sheath (6) which may contain strength members (7). Several of such cushioned bundles of fibres may be S/Z stranded around a central strength member (3) and the optical fibres within each cushion sheath may themselves be stranded. A further foamed plastics sheath (5) may be interposed between the cushioned bundle and strengthening sheath and a water-blocking medium may fill the interstices therebetween. <IMAGE>

Description

SPECIFICATION Optical fibre cables This invention relates to optical fibre cables and particularly to such cables for local wide band or short haul applications.
Thus, the invention provides an optical fibre cable including at least one cushioned fibre bundle comprising a bundle of optical fibres surrounded by a cushion sheath of foamed plastic material, and a further strengthening sheath of plastic material surrounding said at least one cushioned fibre bundle.
In a preferred embodiment, a plurality of cushioned fibre bundles are stranded together within said strengthening sheath possibly with a further layer of foamed plastic material between said cushioned fibre bundles and said strengthening sheath. The cushioned fibre bundles may be stranded together in any desired way, for example, longitudinally, helically, or in S/Z formation, which means helically wound with a periodic reversal of the direction of winding as is known from e.g.
GB 1 598536. They may also be stranded around a central strength member in suitable cases.
Preferably, the optical fibres within a cushioned fibre bundle are themselves stranded in an S/Z formation and may be held together at intervals by a fastening means such as a binding tape.
The cushion sheath of foamed plastic material may be extruded around the optical fibre bundle or may be applied as a tape either longitudinally or helically.
The strengthening sheath likewise may be extruded around the cushioned fibre bundle(s) or may be applied as a tape either longitudinally or helically, and may be applied either tightly around the cushioned fibre bundle(s) or loosely allowing the cushioned fibre bundle(s) to be slack within the strengthening sheath.
The strengthening sheath is preferably made of nylon but any other material with adequate strength and a low friction surface may be used.
The strengthening sheath may have longitudinal strengthening members such as steel, Kevlar or glass fibres embedded within it and further sheaths having various properties with or without strengthening members may also surround said at least one cushioned fibre bundle.
The interstices between the cushioned fibre bundles and the surrounding sheaths may have a water blocking medium such as petroleum jelly within them, if desired.
One embodiment of the invention will now be more fully described by way of example with reference to the drawing which shows an optical fibre cable according to the invention.
Thus, bundles of optical fibres 1 are surrounded by sheaths 2 of foamed plastic material, such as polyurethane, five such bundles being shown in the drawing. The optical fibres are stranded in S/Z formation within the sheath 2 and are bound together at intervals along their length by a strip of Kevlar (not shown). The cushioned bundles are, in turn, stranded in S/Z formation around a central strength member 3, the interstices 4 between the sheathed bundles being filled with a water repellant gel such as petroleum jelly.
This structure of stranded cushioned bundles is itself protected by a further sheath 5 of foamed plastic material which is tightly wrapped by yet a further sheath 6 of polyethylene which has longitudinal strength members 7 embedded within it, and may be followed by a further sheath of nylon.
1. An optical fibre cable including at least one cushioned fibre bundle comprising a bundle of optical fibres surrounded by a cushion sheath of foamed plastic material, and a further strengthening sheath of plastic material surrounding said at least one cushioned fibre bundle.
2. An optical fibre cable according to Claim 1 having a plurality of cushioned fibre bundles stranded together within said strengthening sheath.
3. An optical fibre cable according to Claim 2 wherein said cushioned fibre bundles are stranded together either longitudinally, helically or in S/Z formation.
4. An optical fibre cable according to either Claim 2 or Claim 3 further including a further layer of foamed plastic material between said stranded plurality of cushioned fibre bundles and said strengthening sheath.
5. An optical fibre cable according to any preceding claim further including a central strength member around which the cushioned fibre bundle or bundles is/are stranded.
6. An optical fibre cable according to any preceding claim wherein the optical fibres within the or each cushioned fibre bundle are themselves stranded together.
7. An optical fibre cable according to Claim 6 wherein the optical fibres are held together at intervals by fastening means.
8. An optical fibre cable according to any preceding claim wherein said cushion sheath is extruded around the respective optical fibre bundle.
9. An optical fibre cable according to any one of Claims 1 to 7 wherein said cushion sheath is applied as a tape, either longitudinally or helically, around the respective optical fibre bundle.
1 0. An optical fibre cable according to any preceding claim wherein said strengthening sheath is extruded around the cushioned fibre bundle or bundles.
11. An optical fibre cable according to any one of Claims 1 to 9 wherein said
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (17)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Optical fibre cables This invention relates to optical fibre cables and particularly to such cables for local wide band or short haul applications. Thus, the invention provides an optical fibre cable including at least one cushioned fibre bundle comprising a bundle of optical fibres surrounded by a cushion sheath of foamed plastic material, and a further strengthening sheath of plastic material surrounding said at least one cushioned fibre bundle. In a preferred embodiment, a plurality of cushioned fibre bundles are stranded together within said strengthening sheath possibly with a further layer of foamed plastic material between said cushioned fibre bundles and said strengthening sheath. The cushioned fibre bundles may be stranded together in any desired way, for example, longitudinally, helically, or in S/Z formation, which means helically wound with a periodic reversal of the direction of winding as is known from e.g. GB 1 598536. They may also be stranded around a central strength member in suitable cases. Preferably, the optical fibres within a cushioned fibre bundle are themselves stranded in an S/Z formation and may be held together at intervals by a fastening means such as a binding tape. The cushion sheath of foamed plastic material may be extruded around the optical fibre bundle or may be applied as a tape either longitudinally or helically. The strengthening sheath likewise may be extruded around the cushioned fibre bundle(s) or may be applied as a tape either longitudinally or helically, and may be applied either tightly around the cushioned fibre bundle(s) or loosely allowing the cushioned fibre bundle(s) to be slack within the strengthening sheath. The strengthening sheath is preferably made of nylon but any other material with adequate strength and a low friction surface may be used. The strengthening sheath may have longitudinal strengthening members such as steel, Kevlar or glass fibres embedded within it and further sheaths having various properties with or without strengthening members may also surround said at least one cushioned fibre bundle. The interstices between the cushioned fibre bundles and the surrounding sheaths may have a water blocking medium such as petroleum jelly within them, if desired. One embodiment of the invention will now be more fully described by way of example with reference to the drawing which shows an optical fibre cable according to the invention. Thus, bundles of optical fibres 1 are surrounded by sheaths 2 of foamed plastic material, such as polyurethane, five such bundles being shown in the drawing. The optical fibres are stranded in S/Z formation within the sheath 2 and are bound together at intervals along their length by a strip of Kevlar (not shown). The cushioned bundles are, in turn, stranded in S/Z formation around a central strength member 3, the interstices 4 between the sheathed bundles being filled with a water repellant gel such as petroleum jelly. This structure of stranded cushioned bundles is itself protected by a further sheath 5 of foamed plastic material which is tightly wrapped by yet a further sheath 6 of polyethylene which has longitudinal strength members 7 embedded within it, and may be followed by a further sheath of nylon. CLAIMS
1. An optical fibre cable including at least one cushioned fibre bundle comprising a bundle of optical fibres surrounded by a cushion sheath of foamed plastic material, and a further strengthening sheath of plastic material surrounding said at least one cushioned fibre bundle.
2. An optical fibre cable according to Claim 1 having a plurality of cushioned fibre bundles stranded together within said strengthening sheath.
3. An optical fibre cable according to Claim 2 wherein said cushioned fibre bundles are stranded together either longitudinally, helically or in S/Z formation.
4. An optical fibre cable according to either Claim 2 or Claim 3 further including a further layer of foamed plastic material between said stranded plurality of cushioned fibre bundles and said strengthening sheath.
5. An optical fibre cable according to any preceding claim further including a central strength member around which the cushioned fibre bundle or bundles is/are stranded.
6. An optical fibre cable according to any preceding claim wherein the optical fibres within the or each cushioned fibre bundle are themselves stranded together.
7. An optical fibre cable according to Claim 6 wherein the optical fibres are held together at intervals by fastening means.
8. An optical fibre cable according to any preceding claim wherein said cushion sheath is extruded around the respective optical fibre bundle.
9. An optical fibre cable according to any one of Claims 1 to 7 wherein said cushion sheath is applied as a tape, either longitudinally or helically, around the respective optical fibre bundle.
1 0. An optical fibre cable according to any preceding claim wherein said strengthening sheath is extruded around the cushioned fibre bundle or bundles.
11. An optical fibre cable according to any one of Claims 1 to 9 wherein said strengthening sheath is applied as a tape, either longitudinally or helically, around the cushioned fibre bundle or bundles.
1 2. An optical fibre cable according to any preceding claim wherein said strengthening sheath is applied tightly around the cushioned fibre bundle or bundles.
1 3. An optical fibre cable according to any one of Claims 1 to 11 wherein said strengthening sheath is applied loosely around the cushioned fibre bundle or bundles allowing it or them to be slack within the strengthening sheath.
14. An optical fibre cable according to any preceding claim wherein said strengthening sheath is of nylon.
1 5. An optical fibre cable according to any preceding claim wherein the strengthening sheath has longitudinal strength members embedded within it.
1 6. An optical fibre cable according to any preceding claim wherein the interstices between the bundle or bundles and the strengthening sheath have a water-blocking medium therein.
17. An optical fibre cable substantially as hereinbefore described with reference to the drawing.
GB08506496A 1984-05-23 1985-03-13 Optical fibre cables Withdrawn GB2159291A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB848413205A GB8413205D0 (en) 1984-05-23 1984-05-23 Optical fibre cables

Publications (2)

Publication Number Publication Date
GB8506496D0 GB8506496D0 (en) 1985-04-17
GB2159291A true GB2159291A (en) 1985-11-27

Family

ID=10561410

Family Applications (2)

Application Number Title Priority Date Filing Date
GB848413205A Pending GB8413205D0 (en) 1984-05-23 1984-05-23 Optical fibre cables
GB08506496A Withdrawn GB2159291A (en) 1984-05-23 1985-03-13 Optical fibre cables

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GB848413205A Pending GB8413205D0 (en) 1984-05-23 1984-05-23 Optical fibre cables

Country Status (1)

Country Link
GB (2) GB8413205D0 (en)

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2244568A (en) * 1990-04-28 1991-12-04 Kabelmetal Electro Gmbh Optical cabling element and its production
US6278826B1 (en) * 1999-09-15 2001-08-21 Lucent Technologies Inc. Cables with water-blocking and flame-retarding foam
WO2001084205A2 (en) * 2000-05-04 2001-11-08 Litton Systems, Inc. Fiber optic array harness
EP1308763A2 (en) * 2001-11-02 2003-05-07 Alcatel Buffer tube for use in optical cables providing easy and reliable access to the optical fibres
EP1324090A1 (en) * 2001-12-18 2003-07-02 Alcatel Central tube cable for optical fibers with support member
WO2004061866A2 (en) * 2002-12-19 2004-07-22 Corning Cable Systems Llc Optical tube assembly having a dry insert and methods of making the same
EP1697768A2 (en) * 2003-09-12 2006-09-06 Corning Cable Systems LLC Optical tube assembly having a dry insert and methods of making the same
US7177507B2 (en) 2002-12-19 2007-02-13 Corning Cable Systems, Llc Optical tube assembly having a dry insert and methods of making the same
US7254302B2 (en) 2002-12-19 2007-08-07 Corning Cable Systems, Llc. Optical tube assembly having a dry insert and methods of making the same
US7277615B2 (en) 2002-12-19 2007-10-02 Corning Cable Systems, Llc. Fiber optic cable having a dry insert and methods of making the same
US7302143B2 (en) 2001-06-04 2007-11-27 Pirelli & C. S.P.A. Optical cable provide with a mechanically resistant covering
US7349607B2 (en) 2001-06-20 2008-03-25 Corning Cable Systems Technology Incorporated Optical transmission element
US7471861B2 (en) 2001-06-20 2008-12-30 Corning Cable Systems Llc Optical transmission element
US7471862B2 (en) 2002-12-19 2008-12-30 Corning Cable Systems, Llc Dry fiber optic cables and assemblies
US7693375B2 (en) 2002-12-19 2010-04-06 Corning Cable Systems Llc Fiber optic cable having a dry insert
EP4279965A4 (en) * 2021-01-12 2024-06-05 Sumitomo Electric Industries, Ltd. Optical fiber cable and connector-equipped cable
EP4209812A4 (en) * 2020-09-02 2024-12-18 Fujikura Ltd. OPTICAL CABLE AND METHOD FOR MANUFACTURING OPTICAL CABLE

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1451232A (en) * 1973-06-28 1976-09-29 Bicc Ltd Optical guidesd
GB1489358A (en) * 1975-09-16 1977-10-19 Int Standard Electric Corp Optical cable
GB1506405A (en) * 1974-06-07 1978-04-05 Sumitomo Electric Industries Optical fibre cable
GB2019601A (en) * 1978-04-20 1979-10-31 Telephone Cables Ltd Optical fibre cables
GB1572877A (en) * 1977-02-23 1980-08-06 Bicc Ltd Optical cables
GB1582851A (en) * 1977-01-26 1981-01-14 Bicc Ltd Optical cables
GB2102148A (en) * 1981-06-17 1983-01-26 Bicc Plc An improved optical cable
GB2144237A (en) * 1983-07-28 1985-02-27 American Telephone & Telegraph Optical fiber cable

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1451232A (en) * 1973-06-28 1976-09-29 Bicc Ltd Optical guidesd
GB1506405A (en) * 1974-06-07 1978-04-05 Sumitomo Electric Industries Optical fibre cable
GB1489358A (en) * 1975-09-16 1977-10-19 Int Standard Electric Corp Optical cable
GB1582851A (en) * 1977-01-26 1981-01-14 Bicc Ltd Optical cables
GB1572877A (en) * 1977-02-23 1980-08-06 Bicc Ltd Optical cables
GB2019601A (en) * 1978-04-20 1979-10-31 Telephone Cables Ltd Optical fibre cables
GB2102148A (en) * 1981-06-17 1983-01-26 Bicc Plc An improved optical cable
GB2144237A (en) * 1983-07-28 1985-02-27 American Telephone & Telegraph Optical fiber cable

Cited By (35)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2244568A (en) * 1990-04-28 1991-12-04 Kabelmetal Electro Gmbh Optical cabling element and its production
GB2244568B (en) * 1990-04-28 1994-11-02 Kabelmetal Electro Gmbh Optical cabling element and its production
US6278826B1 (en) * 1999-09-15 2001-08-21 Lucent Technologies Inc. Cables with water-blocking and flame-retarding foam
WO2001084205A2 (en) * 2000-05-04 2001-11-08 Litton Systems, Inc. Fiber optic array harness
WO2001084205A3 (en) * 2000-05-04 2002-05-23 Litton Systems Inc Fiber optic array harness
US6519395B1 (en) 2000-05-04 2003-02-11 Northrop Grumman Corporation Fiber optic array harness
US7302143B2 (en) 2001-06-04 2007-11-27 Pirelli & C. S.P.A. Optical cable provide with a mechanically resistant covering
US7349607B2 (en) 2001-06-20 2008-03-25 Corning Cable Systems Technology Incorporated Optical transmission element
US7471861B2 (en) 2001-06-20 2008-12-30 Corning Cable Systems Llc Optical transmission element
EP1308763A3 (en) * 2001-11-02 2005-04-20 Alcatel Buffer tube for use in optical cables providing easy and reliable access to the optical fibres
EP1308763A2 (en) * 2001-11-02 2003-05-07 Alcatel Buffer tube for use in optical cables providing easy and reliable access to the optical fibres
EP1324090A1 (en) * 2001-12-18 2003-07-02 Alcatel Central tube cable for optical fibers with support member
US6987916B2 (en) 2001-12-18 2006-01-17 Alcatel Fiber optic central tube cable with bundled support member
US7236670B2 (en) 2002-12-19 2007-06-26 Corning Cable Systems, Llc. Optical tube assembly having a dry insert and methods of making the same
US7471862B2 (en) 2002-12-19 2008-12-30 Corning Cable Systems, Llc Dry fiber optic cables and assemblies
CN101339280B (en) * 2002-12-19 2010-12-01 康宁光缆系统有限公司 Optical tube assembly having a dry insert and methods of making the same
US7751666B2 (en) 2002-12-19 2010-07-06 Corning Cable Systems Llc Optical tube assembly having a dry insert and methods of making the same
US7254302B2 (en) 2002-12-19 2007-08-07 Corning Cable Systems, Llc. Optical tube assembly having a dry insert and methods of making the same
EP1818704A3 (en) * 2002-12-19 2007-09-05 Corning Cable Systems LLC Optical tube assembly having a dry insert and method of making the same
US7277615B2 (en) 2002-12-19 2007-10-02 Corning Cable Systems, Llc. Fiber optic cable having a dry insert and methods of making the same
US6970629B2 (en) 2002-12-19 2005-11-29 Corning Cable Systems Llc Optical tube assembly having a dry insert and methods of making the same
US7336873B2 (en) 2002-12-19 2008-02-26 Corning Cable Systems, Llc. Optical tube assembly having a dry insert and methods of making the same
WO2004061866A3 (en) * 2002-12-19 2004-09-16 Corning Cable Sys Llc Optical tube assembly having a dry insert and methods of making the same
WO2004061866A2 (en) * 2002-12-19 2004-07-22 Corning Cable Systems Llc Optical tube assembly having a dry insert and methods of making the same
US7177507B2 (en) 2002-12-19 2007-02-13 Corning Cable Systems, Llc Optical tube assembly having a dry insert and methods of making the same
CN100456071C (en) * 2002-12-19 2009-01-28 康宁光缆系统有限公司 Optical tube assembly having a dry insert and methods of making the same
US7693375B2 (en) 2002-12-19 2010-04-06 Corning Cable Systems Llc Fiber optic cable having a dry insert
US7747117B2 (en) 2002-12-19 2010-06-29 Corning Cable Systems Llc Optical tube assembly having a dry insert and methods of making the same
EP1697768A2 (en) * 2003-09-12 2006-09-06 Corning Cable Systems LLC Optical tube assembly having a dry insert and methods of making the same
EP1697768A4 (en) * 2003-09-12 2007-05-16 Corning Cable Sys Llc Optical tube assembly having a dry insert and methods of making the same
US9482837B2 (en) 2005-07-29 2016-11-01 Corning Cable Systems Llc Dry fiber optic cables and assemblies
US9494755B2 (en) 2005-07-29 2016-11-15 Corning Optical Communications LLC Fiber optic cable assembly
US9971101B2 (en) 2005-07-29 2018-05-15 Corning Optical Communications LLC Fiber optic cable assembly
EP4209812A4 (en) * 2020-09-02 2024-12-18 Fujikura Ltd. OPTICAL CABLE AND METHOD FOR MANUFACTURING OPTICAL CABLE
EP4279965A4 (en) * 2021-01-12 2024-06-05 Sumitomo Electric Industries, Ltd. Optical fiber cable and connector-equipped cable

Also Published As

Publication number Publication date
GB8506496D0 (en) 1985-04-17
GB8413205D0 (en) 1984-06-27

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WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)