NZ201636A - Optical cable:fibres and plastics strength members helically laid in common layer - Google Patents
Optical cable:fibres and plastics strength members helically laid in common layerInfo
- Publication number
- NZ201636A NZ201636A NZ201636A NZ20163682A NZ201636A NZ 201636 A NZ201636 A NZ 201636A NZ 201636 A NZ201636 A NZ 201636A NZ 20163682 A NZ20163682 A NZ 20163682A NZ 201636 A NZ201636 A NZ 201636A
- Authority
- NZ
- New Zealand
- Prior art keywords
- strength members
- optical
- fibres
- plastics
- cable
- Prior art date
Links
- 230000003287 optical effect Effects 0.000 title claims description 30
- 239000004033 plastic Substances 0.000 title claims description 10
- 229920003023 plastic Polymers 0.000 title claims description 10
- 239000013307 optical fiber Substances 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 6
- 230000004888 barrier function Effects 0.000 claims description 5
- 239000003795 chemical substances by application Substances 0.000 claims 1
- 239000000835 fiber Substances 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 229920000271 Kevlar® Polymers 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000004760 aramid Substances 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000004761 kevlar Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
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
- G02B6/4479—Manufacturing methods of optical cables
- G02B6/4486—Protective covering
- G02B6/4488—Protective covering using metallic tubes
-
- 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)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Communication Cables (AREA)
- Insulated Conductors (AREA)
Description
2016 mam Priority Date(s): ..« Complete Specification Filed: Class: Hojfc.n^bo : Publication Date; ...
P.O. Journal, No: .. fflk NEW ZEALAND THE PATENTS ACT, 1953 COMPLETE SPECIFICATION - "OPTICAL CABLES" WE, INTERNATIONAL STANDARD ELECTRIC CORPORATION , a Corporation of the State of Delaware, United States of America, of 320 Park Avenue, New York 22, New York, United States of America, 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 \ 20163S This invention relates to optical cables.
A typical optical cable incorporates one or more coated optical fibres, strength members to give structural strength and stability to the cable, a water barrier to protect the fibre or fibres against ingress 5 of water and sheathing. The strength members can be strands of steel or other high strength material which may be wrapped helically round the optical fibres. The helical wrapping provides stability for the strength members within the cable bat results in a radial compressive load on the part of the cable within the helix when the cable cones under 10 tensile load. This compressive load may be unacceptable, particularly if it can tend to crush two or more fibres together and because it can cause micro-bending.
An object of the invention is to provide an optical cable in which strength members are arranged in favourable locations. 15 According to the invention there is provided an optical cable comprising a central core in the form of a first optical fibre, a plurality of plastics strength members and a plurality of further optical fibres laid about said core, wherein said plastics strength members and said further optical fibres are laid in a common layer in which each said 20 further optical fibre lies between two said strength members.
Preferably the core may itself be an optical fibre or an additional strength member.
Preferably the strength members are of high strength plastics material and preferably they are cords each forms frcm strands of this 25 material.
CrF'iCE 3 AUG 1985 RECEIVED 201636 Preferably the layer containing optical fibres and strength members is surrounded by a water barrier which is in turn surrounded by sheathing.
An embodiment of the invention will now be described with reference to the accompanying drawing which is a cross section of an optical cable embodying the invention.
A mono-filament in the form of a secondary coated optical fibre 11 is arranged centrally and forms a core. The core 11 is surrounded by an annular layer made up of four coated secondary optical fibres 12 interspersed between four longitudinally extending strength members 13. The strength members 13 are formed from strands of a high strength plastics material such as aromatic poly-amide fibres formed into cords. In this embodiment we used Kevlar (RTM) cords. The strength members 13 are formed initially with an approximated circular cross-section but take on a shape conforming generally to the spaces within the layer between two adjacent optical fibres 12 when they are assembled into the cable. The optical fibres 12 and strength members 13 are wound helically round the core 11.
A layer 14 of wrapping tape surrounds the layer of optical fibres 12 and strength members 13. This tape is wound in a helix of the optical fibres 12 and strength members 13 and confines the strength members. The tape function to hold the cable together prior to sheathing. 201636 An aluminium-polymer laminate wrapped round the layer of tape 14 provides a water barrier 15 to prevent ingress of water into the region of the optical fibres.
The cable as thus far described can be sheathed in any convenient way. In the example shown in the drawing, there is an inner cable sheathing layer 16 of black polyethelene.
This is surrounded by a paper tape layer 17 made up of longitudinal paper tapes. The paper tape layer 17 is itself surrounded by an outer sheathing layer 18 of black polyethelene.
The provision of the strength members near the centre of the cable provides good flexibility for the cable without building up high local compressive loads. Also, when the cable and in particular the helically wound strength members 13 are subjected to tension, the tendency for the helix of the strength members to close up and thereby produce a compressive load only produces such a load directly on the central core 11. There is no question of compressing one optical fibre against another or against any other hard and possibly damaging components, and the possibility of microbending is minimised if not eliminated.
In a typical example the diameter of the core is 2mm, the optical fibre is 1.25mm, the O.D. diameter of the secondary coating on the fibre is 2mm and the initial diameter of the strength members 13 is 1.1mm. The overall diameter of this cable, including sheathing is 13mm. The wrapping tape and the N.2. PATENT Of-FICE 2 1 FEB 1985 RECEIVED 2016 polymer of the water barrier may both be polyethelene.
The central core 11 is rigid in relation to the soft flexible strength members 13.
In an alternative construction in which the capacity requirement for the cable does not require four secondary optical fibres, one or more of these optical fibres may be replaced by a filler member of similar size and mechanical properties to the optical fibres.
Claims (1)
1. tijKcd" C-U*. \ w\ Xs:;Tho olaimc defining the invention aro as—followo;—;1. An optical cable comprising a central core in the form of a first optical fibre, a plurality of plastics strength members and a plurality of further optical fibres laid about said core, wherein said plastics strength members and said further optical fibres are laid in a common layer in which each said further optical fibre lies between two said strength members.;2. An optical cable as claimed in claim 1, wherein said plastics strength members and said further optical fibres are helically laid about said core.;3. An optical-cable as claimed in claim 1 or 2, wherein each strength member is composed of high strength plastics material.;4. An optical cable as claimed.Vin claim, 3, wherein the strength members are formed as cords from strands of said material.;5. An optical cable as claimed in any one of the preceding claims, wherein the common layer of plastics strength members and further optical fibres is surrounded by a water barrier element which is itself surrounded by sheathing.;6. An optical cable substantially as herein described with reference to the accompanying drawings.;INTERNATIONAL '*£■ "" ' ''' CORPORATION P.M. Conrick Authorized Agent P5/1/1466
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB08126499A GB2105484A (en) | 1981-09-01 | 1981-09-01 | Optical fibre cables |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| NZ201636A true NZ201636A (en) | 1985-10-11 |
Family
ID=10524260
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NZ201636A NZ201636A (en) | 1981-09-01 | 1982-08-18 | Optical cable:fibres and plastics strength members helically laid in common layer |
Country Status (3)
| Country | Link |
|---|---|
| AU (1) | AU553588B2 (en) |
| GB (2) | GB2105484A (en) |
| NZ (1) | NZ201636A (en) |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NO833763L (en) * | 1982-10-28 | 1984-04-30 | Int Standard Electric Corp | OPTICAL FIBER CABLE |
| JPS61148012U (en) * | 1985-03-04 | 1986-09-12 | ||
| JPS62181906U (en) * | 1986-05-10 | 1987-11-18 | ||
| GB8619308D0 (en) * | 1986-08-07 | 1986-09-17 | Telephone Cables Ltd | Optical cables |
| GB2199961B (en) * | 1987-01-13 | 1990-09-26 | Stc Plc | Optical fibre cable containing non-circular cross section wires. |
| US4852965A (en) * | 1987-02-27 | 1989-08-01 | American Telephone And Telegraph Company At&T Bell Laboratories | Composite service and distribution communications media |
| GB8729455D0 (en) * | 1987-12-17 | 1988-02-03 | Telephone Cables Ltd | Submarine optical cable |
| AT2039U1 (en) * | 1996-01-22 | 1998-03-25 | Oekw Oesterreichische Kabelwer | Fiber optic cable |
| AU2005276963B2 (en) * | 2004-08-27 | 2010-08-19 | Prysmian Australia Pty Ltd | System and device for hauling fibre optic cable along a conduit |
| EP1787369B1 (en) | 2004-08-27 | 2011-11-30 | Prysmian Telecom Cables & Systems Australia Pty Ltd | System and device for hauling fibre optic cable along a conduit |
| NO20101359A1 (en) | 2010-09-30 | 2012-04-02 | Nexans | Power cable with laminated water barrier |
| CN114706179B (en) * | 2022-04-06 | 2023-09-01 | 富通集团（嘉善）通信技术有限公司 | Wind-light-resistant cable |
-
1981
- 1981-09-01 GB GB08126499A patent/GB2105484A/en not_active Withdrawn
-
1982
- 1982-05-27 GB GB08215534A patent/GB2105486B/en not_active Expired
- 1982-08-18 NZ NZ201636A patent/NZ201636A/en unknown
- 1982-08-26 AU AU87741/82A patent/AU553588B2/en not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| GB2105484A (en) | 1983-03-23 |
| AU553588B2 (en) | 1986-07-24 |
| GB2105486B (en) | 1985-08-14 |
| AU8774182A (en) | 1983-03-10 |
| GB2105486A (en) | 1983-03-23 |
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