GB2325308A - Sheathed optic fibre optic cable with inner tubes - Google Patents

Sheathed optic fibre optic cable with inner tubes Download PDF

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Publication number
GB2325308A
GB2325308A GB9708069A GB9708069A GB2325308A GB 2325308 A GB2325308 A GB 2325308A GB 9708069 A GB9708069 A GB 9708069A GB 9708069 A GB9708069 A GB 9708069A GB 2325308 A GB2325308 A GB 2325308A
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GB
United Kingdom
Prior art keywords
optic cable
fibre optic
inner tubes
optical fibres
fibres
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
GB9708069A
Other versions
GB2325308B (en
GB9708069D0 (en
Inventor
Raymond Keith Brierley
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.)
BKA
Original Assignee
BKA
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 BKA filed Critical BKA
Priority to GB9708069A priority Critical patent/GB2325308B/en
Publication of GB9708069D0 publication Critical patent/GB9708069D0/en
Publication of GB2325308A publication Critical patent/GB2325308A/en
Application granted granted Critical
Publication of GB2325308B publication Critical patent/GB2325308B/en
Anticipated expiration legal-status Critical
Expired - Fee Related 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
    • G02B6/44—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
    • 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
    • G02B6/4479—Manufacturing methods of optical cables
    • G02B6/4482—Code or colour marking

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

Abstract

A fibre optic cable comprising an outer sheath 11 encasing a plurality of inner tubes 12,13,14, each inner tube encasing a plurality of individual optical fibres 16. The inner tubes are preferably manufactured from material having a coefficient of friction of 0À12 or lower and resistance to moisture penetration. The outer sheath preferably also contains an aramid yarn 20 to increase tensile strength. Preferably the inner tube is unfilled and made of polypropylene. The outer sheath is preferably made of low smoke zero halogen material. The cable is preferably non-metallic. The inner tubes or optic fibres may be colour coded.

Description

The present invention relates to Fibre Optic cables One of the preferred aims is to provide a multi - fibre cable suitable for both internal wiring and external duct applications, which is much more convenient to use than presently available multi fibre cable One aspect of the invention provides a Fibre Optic cable comprising of an outer sheathing encasing a plurality of inner tubes, each inner tube encasing a plurality of individual Optical Fibre. In addition the inner tubes are manufactured from material of low coefficient of friction which allows the the Optical Fibres to move freely within the tubes witbout snagging and without any additional lubricant. It is preferable that tbis material has a coefficient of friction of 0.12 or lower and also has a good resistance to moisture penetration.
Preferably, the outer sheath is made from Low Smoke Zero Halogen material The inner tubes are made of a material which is moisture proof and also has a low coefficient of friction.Tbe advantages of the combined properties of these materials are that the moisture proof tubes together with the Halogen free outer sheath provides a long term protection against moisture when staled in external ducting that mar become waterlogged, and the fire resistant and low toxicity properties allow the cable to be used indoors.
Preferably, the space inside the sheath and between the internal tubes is filled with yam such as Kevlar;,or other similar material which win provide sufficient tensile strength for the design and also offer a higb degree of protection against Rodents.
Many currently available cables use a gel to fifl the space within the inner tubes between the fibres, which is messy, difficult to remove and can cause problems when terminating or interconnecting cables. The gel is used to provide botch protection from water ingress and provide lubrication to the individual fibres within the tubes The invention offs s cable with tubes that do not require, or contain gel or any other water blocking material Preferably, the inner tubes each contain between two and sixteen individual optic fibres In the preferred embodiment of the invention there are three inner tubes which between them can house up to forty eight individual fibres. The individual fibres may be Singlemode, Multimode or a composite of Single and Multimode.
The inner tubes may be colour coded as indeed can the individual coated fibres.
Preferably, the entire cable structure is totally non metallic.
An embodiment of the invention will now be described by way of example only and with the reference to the accompanying drawing which is a cross sectional view through the cable according to the invention with one of the individual fibres shown enlarged.
The illustrated fibn optic cable 10 comprises of an outer sheath 11 typically made of Low Smoke Zero Halogen materiaL The outer sheath 11 houses three individual tubes 12, 13, 14 each of which houses several individually coloured optical fibres, one of which b indicated by the numeral 16. One coated fibre 16 is shown enlarged.
Each optical fibre 16 has the usual primary and secondary coating, 17 and 18.
One tube, 12, 13 or 14 can house up to sixteen individually coated fibres 16.
The individual fibres 16 can be of various types, sich as Singlemode, Multimode or composite of both The space 20 between the individual tubes, 12, 13, 14 is filled with aramid yarn such as Kevlar. Other materials with equivelant strength and protection properties may be used.
The individual tubes 12, 13, 14 are typically made from Polypropylene or alternative materials with equivelant properties with particular respect to moisture protection and low coefficient of friction. The space between the fibres within the individual tubes are -filliL Typical dimensions of the cabk are as:- Sheath 11 outer Diameter 9.5mm Sheath 11 Inner Diameter 7.6mm Tubes 12,13,14 Diameter 4.0mm Primuy fibre coating 125 Micron Secondary fibre coating 250 Micron

Claims (18)

  1. Claims 1. A fibre optic cable comprising an outer sheath encasing a plurality of inner tubes, each inner tube encasing a plurality of individual fibres.
  2. 2. A fibre optic cable as claimed in claim 1 wherein the inner tubes are manufactured from material having a coefficient of friction of 0. l2 or lower.
  3. 3. A fibre optic cable as claimed in claim 1 or 2 wherein the coefficient of fiction of the material of the inner tubes is sufficiently low that no lubricant is required between the inner tubes and the optical fibres.
  4. 4. A fibre optic cable as claimed in claim 1, 2 or 3 wherein the inner tubes are manufactured from a moisture- proof material.
  5. 5. A fibre optic cable as claimed in any preceding claim wherein the space between the optical fibres within each inner tube is unfilled.
  6. 6. A fibre optic cable as claimed in any preceding claim wherein the inner tubes are made of polypropylene.
  7. 7. A fibre optic cable as claimed in any preceding claim wherein the outer sheath is made of low smoke zero halogen material.
  8. 8. A fibre optic cable as claimed in any preceding claim wherein the space inside the outer sheath and between the inner tubes is filled with yarn.
  9. 9. A fibre optic cable as claimed in claim 8 wherein the yarn is made of Kevlar(sst)
  10. 10. A fibre optic cable as claimed in any preceding claim wherein the entire fibre optic cable is non-metallic.
  11. 11. A fibre optic cable as claimed in any preceding claim wherein the inner tubes each contain between two and sixteen individual optical fibres.
  12. 12 A fibre optic cable as claimed in any preceding claim wherein the outer casing contains three inner tubes.
  13. 13. A fibre optic cable as claimed in any preceding claim wherein the individual optical fibres are singlemode optical fibres.
  14. 14. A fibre optic cable as claimed in any preceding claim wherein the individual optical fibres are multimode optical fibres.
  15. 15. A fibre optic cable as claimed in any preceding claim wherein the optical fibres comprise a composite of single and multimode fibres.
  16. 16. A fibre optic cable as claimed in any preceding claim wherein the inner tubes are colour coded.
  17. 17. A fibre optic cable as claimed in any preceding claim wherein the individual optical fibres are colour coded.
  18. 18. A fibre optic cable substantially as hereinbefore described with reference to the accompanying drawing.
GB9708069A 1997-04-22 1997-04-22 Sheathed optic fibre cable with inner tubes Expired - Fee Related GB2325308B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9708069A GB2325308B (en) 1997-04-22 1997-04-22 Sheathed optic fibre cable with inner tubes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9708069A GB2325308B (en) 1997-04-22 1997-04-22 Sheathed optic fibre cable with inner tubes

Publications (3)

Publication Number Publication Date
GB9708069D0 GB9708069D0 (en) 1997-06-11
GB2325308A true GB2325308A (en) 1998-11-18
GB2325308B GB2325308B (en) 2001-08-01

Family

ID=10811123

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9708069A Expired - Fee Related GB2325308B (en) 1997-04-22 1997-04-22 Sheathed optic fibre cable with inner tubes

Country Status (1)

Country Link
GB (1) GB2325308B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2459347A (en) * 2008-04-23 2009-10-28 Schlumberger Holdings Running optical fibre in a well using fluid flow

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4153332A (en) * 1974-07-30 1979-05-08 Industrie Pirelli Societa Per Azioni Sheathed optical fiber element and cable
GB2159978A (en) * 1984-05-23 1985-12-11 Telephone Cables Ltd Optical fibre cables
EP0320069A2 (en) * 1987-12-11 1989-06-14 Dsm N.V. Optical fiber cable
US4909593A (en) * 1987-12-21 1990-03-20 Alcatel N.V. Optical cable having at least two separate multiple-fiber units each having its own soft plastic envelope
GB2247340A (en) * 1990-08-24 1992-02-26 Stc Plc Fire resistant electric or optic cable
WO1994018591A1 (en) * 1993-02-11 1994-08-18 Commscope, Inc. Fiber optic cable having buffer tubes with optical fiber bundles therein and method for making same
US5378856A (en) * 1992-12-11 1995-01-03 Belden Wire & Cable Company Transmission cable having a nonhalogenated jacket formulation
US5390273A (en) * 1992-04-02 1995-02-14 Pirelli Cable Corporation Flame resistant optical fiber cable with optical fibers loosely enclosed in tubes
US5621841A (en) * 1995-09-20 1997-04-15 Siecor Corporation Optical fiber cable containing ribbons in stranded tubes

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4153332A (en) * 1974-07-30 1979-05-08 Industrie Pirelli Societa Per Azioni Sheathed optical fiber element and cable
GB2159978A (en) * 1984-05-23 1985-12-11 Telephone Cables Ltd Optical fibre cables
EP0320069A2 (en) * 1987-12-11 1989-06-14 Dsm N.V. Optical fiber cable
US4909593A (en) * 1987-12-21 1990-03-20 Alcatel N.V. Optical cable having at least two separate multiple-fiber units each having its own soft plastic envelope
GB2247340A (en) * 1990-08-24 1992-02-26 Stc Plc Fire resistant electric or optic cable
US5390273A (en) * 1992-04-02 1995-02-14 Pirelli Cable Corporation Flame resistant optical fiber cable with optical fibers loosely enclosed in tubes
US5378856A (en) * 1992-12-11 1995-01-03 Belden Wire & Cable Company Transmission cable having a nonhalogenated jacket formulation
WO1994018591A1 (en) * 1993-02-11 1994-08-18 Commscope, Inc. Fiber optic cable having buffer tubes with optical fiber bundles therein and method for making same
US5621841A (en) * 1995-09-20 1997-04-15 Siecor Corporation Optical fiber cable containing ribbons in stranded tubes

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2459347A (en) * 2008-04-23 2009-10-28 Schlumberger Holdings Running optical fibre in a well using fluid flow
GB2459347B (en) * 2008-04-23 2010-09-22 Schlumberger Holdings System and method for deploying optical fiber
US7946350B2 (en) 2008-04-23 2011-05-24 Schlumberger Technology Corporation System and method for deploying optical fiber

Also Published As

Publication number Publication date
GB2325308B (en) 2001-08-01
GB9708069D0 (en) 1997-06-11

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20040422