GB2185828A - Optical cable comprising non- metallic reinforced plastics tube - Google Patents
Optical cable comprising non- metallic reinforced plastics tube Download PDFInfo
- Publication number
- GB2185828A GB2185828A GB08701986A GB8701986A GB2185828A GB 2185828 A GB2185828 A GB 2185828A GB 08701986 A GB08701986 A GB 08701986A GB 8701986 A GB8701986 A GB 8701986A GB 2185828 A GB2185828 A GB 2185828A
- Authority
- GB
- United Kingdom
- Prior art keywords
- optical cable
- optical
- flexible
- tube
- plastics material
- 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
Links
- 230000003287 optical effect Effects 0.000 title claims abstract description 84
- 239000002990 reinforced plastic Substances 0.000 title 1
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 32
- 239000000463 material Substances 0.000 claims abstract description 28
- 239000000203 mixture Substances 0.000 claims abstract description 22
- 239000013307 optical fiber Substances 0.000 claims abstract description 19
- 230000001681 protective effect Effects 0.000 claims abstract description 10
- 239000003000 extruded plastic Substances 0.000 claims abstract description 6
- -1 polypropylene Polymers 0.000 claims abstract description 5
- 239000004033 plastic Substances 0.000 claims description 23
- 229920003023 plastic Polymers 0.000 claims description 23
- 239000007769 metal material Substances 0.000 claims description 5
- 239000004760 aramid Substances 0.000 claims description 4
- 229920003235 aromatic polyamide Polymers 0.000 claims description 4
- 239000002131 composite material Substances 0.000 claims description 3
- 239000012858 resilient material Substances 0.000 claims description 3
- 229920001169 thermoplastic Polymers 0.000 claims description 3
- 239000004416 thermosoftening plastic Substances 0.000 claims description 3
- 229920000106 Liquid crystal polymer Polymers 0.000 claims description 2
- 229920001187 thermosetting polymer Polymers 0.000 claims description 2
- 229920000271 Kevlar® Polymers 0.000 abstract description 3
- 239000004761 kevlar Substances 0.000 abstract description 3
- 239000004677 Nylon Substances 0.000 abstract description 2
- 239000004743 Polypropylene Substances 0.000 abstract description 2
- 229920001778 nylon Polymers 0.000 abstract description 2
- 229920001155 polypropylene Polymers 0.000 abstract description 2
- 125000003118 aryl group Chemical group 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 229920003232 aliphatic polyester Polymers 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 239000005304 optical glass Substances 0.000 description 1
- 229920000768 polyamine Polymers 0.000 description 1
- 229920000343 polyazomethine Polymers 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920001225 polyester resin Polymers 0.000 description 1
- 239000004645 polyester resin Substances 0.000 description 1
- 229920006149 polyester-amide block copolymer Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin 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
- G02B6/4401—Optical cables
- G02B6/4429—Means specially adapted for strengthening or protecting the cables
- G02B6/443—Protective covering
-
- 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
- G02B6/4415—Cables for special applications
Abstract
An optical cable, especially suitable for use as an aerial cable, comprises a circumferentially rigid flexible tube 25 which throughout its length and cross-sectional area is made of a composition comprising a multiplicity of longitudinally stressed elongate flexible non-metallic reinforcing elements, e.g. Kevlar, each substantially encapsulated in extruded plastics material, e.g. polypropylene or nylon. An outer protective non-metallic sheath 27 surrounds the tube 25 and at least one flexible optical guide 21, e.g. a separate optical fibre, optical bundle or optical fibre ribbon structure, is housed in the bore of and is movable relative to the tube. Paper tape 24 is also shown. The tube (35, Fig. 4) may comprise several elongate flexible bodies (36) helically laid-up together to form the tube. <IMAGE>
Description
SPECIFICATION
Optical cable
This invention relates to optical cables for the transmission of the ultra-violet, visible and infra-red regions of the electromagnetic spec.
trum, which regions, for convenience, will hereinafter all be included in the generic term "light" and especially, but not exclusively, to optical cables for use in the communications field adapted for transmission of light having a wavelength within the range 0.8 to 2.1 micrometres.
It is an object of the present invention to provide an improved optical cable which is especially, but not exclusively, suitable for use as an aerial optical cable.
According to the invention, the improved optical cable comprises a substantially circumferentially rigid flexible tube which throughout substantially the whole of its length and cross-sectional area is made of a composition comprising a multiplicity of longitudinally stressed elongate flexible non-metallic reinforcing elements each substantially encapsulated in extruded plastics material; an outer protective sheath of non-metallic material surrounding the circumferentially rigid tube; and, housed in the bore of and movable relative to the circumferentially rigid tube, at least one flexible optical guide.
By virtue of the fact that throughout substantially the whole of its length and crosssectional area the circumferentially rigid tube is made of the aforesaid composition, the multiplicity of non-metallic reinforcing elements are substantially evenly distributed throughout the cross-setional area of the tube.
Since the or each flexible optical guide is movable relative to the circumferentially rigid tube in which it housed, limited relative movement between the or each flexible optical guide and the circumferentially rigid tube can take place when the improved optical cable vibrates, oscillates or is otherwise flexed as may, for example, occur when the optical cable, being employed as an aerial cable, is freely suspended from spaced supports in long lengths and is subjected to winds.
The circumferentially rigid tube of the improved optical cable may be a single elongate body made of the aforesaid composition or, where a high degree of flexibility is required, it may be of a composite form and comprise a plurality of elongate flexible bodies, each made of the aforesaid composition, helically laid up together, preferably the elongate bodies each being of a cross-section approximating to a sector of an annulus.
Preferably, at any position along the length of the optical cable the proportion of nonmetallic reinforcing elements in the composition of the or each elongate body of the circumferentially rigid tube lies in the range 60 to 70%. The non-metallic reinforcing elements in the composition of the or each elongate body of the circumferentially rigid tube preferably extend helically of the body with a long length of lay.
By way of example, the circumferentially rigid tube may have an overall diameter lying in the range 10 to 20mm and an internal diameter lying in the range 5 to iOmm and the multiplicity of longitudinally stressed elongate flexible non-metallic reinforcing elements encapsulated in the extruded plastics material of the or each elongate body of the tube preferably extend helically of the body with a lay length lying in the range 50 to 300mm.
The longitudinally stresses, elongate flexible non-metallic reinforcing elements of the aforesaid composition preferably are made of an aromatic polyamide such as that sold under the trade name "Kevlar"; alternative nonmetallic materials of which they may be made include non-optical glass and carbon.
The plastics material of the aforesaid composition in which the non-metallic reinforcing elements are encapsulated preferably is a thermoplastics material, such as polypropylene or nylon but, in some circumstances, it may be a thermosetting plastics material, such as a polyester or epoxy resin or polyurethane.
Other plastics materials in which the nonmetallic reinforcing elements may be encapsulated are thermotropic liquid crystalline polymers such as wholly aromatic polyesters, aromatic-aliphatic polyesters, aromatic polyazomethines, aromatic polyester-carbonates and wholly or non-wholly aromatic polyester amides.
In one aspect of the invention, the or each flexible optical guide may comprise a separate optical fibre, an optical bundle as hereinafter defined, or an optical fibre ribbon structure.
By the expression "optical bundle" is meant a group of optical fibres or a group of fibres including one or moe optical fibres and one or more non-optical reinforcing fibres or other reinforcing elongate elements.
In another aspect of the invention, the circumferentially rigid tube may tightly surround an optical cable element comprising an assembly of separately formed tubes of plastics material, in at least one of which at least one separate optical fibre, optical bundle, optical fibre ribbon structure or other flexible optical guide is loosely housed. In a preferred embodiment of this aspect of the invention, the optical cable element comprises a plurality of separately formed plastics tubes helically wound around a central flexible elongate member of non-metallic material, e.g. an aromatic polyamine such as that sold under the tradename "Kevlar".
In all cases where the or each flexible optical guide of the improved optical cable is an optical fibre ribbon structure, preferably the optical fibre ribbon sructure is of a construc tion in accordance with our British Patent No: 2141558B and comprises a plurality of optical fibres and at least one flexible elongate reinforcing element of substantially resilient material arranged side by side and embedded in an elongate body of plastics material, wherein the or each resilient reinforcing element is set in such a form that the ribbon structure follows a path of smoothly curved undulations whose axes of curvature lie transverse to the longitudinal axis of the ribbon structure, the arrangement being such that, when the undulating ribbon structure is subjected to a tensile force, the ribbon structure straightens in a lengthwise direction against the action of the undulating resilient reinforcing element or elements thereby reducing the tensile force applied to the optical fibres and, when the tensile force is removed, the ribbon structure returns towards its original undulating form.
The outer protective sheath of the improved optical cable may be of any suitable plastics material, polyethylene being preferred.
The invention is further illustrated by a description, by way of example, of four preferred forms of the improved optical cable with reference to the accompanying drawing, in which:
Figure 1 is a transverse cross-sectional view, drawn on an enlarged scale, of a first preferred form of optical cable;
Figure 2 is a transverse cross-sectional view, drawn on an enlarged scale, of a second preferred form of optical cable;
Figure 3 is a transverse cross-sectional view, drawn on an enlarged scale, of a third preferred form of optical cable, and
Figure 4 is a transverse cross-sectional view, drawn on an enlarged scale, of a fourth preferred form of optical cable.
The first preferred form of optical cable shown in Fig. 1 comprises four plastics tube 2, in each of which a separate optical fibre 1 is loosely housed and which are helically laidup together to form an optical cable element around which is helically wound a plastics tape 4. The taped optical cable element is surrounded by a substantially circumferentially rigid flexible tube 5 which throughout substantially the whole of its length and cross-sectional area is made of a composition comprising a multiplicity of longitudinally stressed elongate flexible reinforcing elements of an aromatic polyamide which extend helically of the tube with a long length of lay and each of which is substantially encapsulated in extruded thermoplastics material, the proportion of reinforcing elements in the composition lying in the range 60 to 70%.A protective sheath 7 of plastics material surrounds the circumferentially rigid tube 5. It will be appreciated that since each of the optical fibres 1 is loosely housed in a plastics tube 2 of the optical cable element, each optical fibre is movable relative to the circumferentially rigid tube 5.
In the second preferred form of optical cable shown in Fig. 2, the optical cable element comprises a central flexible elongate reinforcing member 13 of a resin bonded aromatic polyamide around which are helically laid six plastics tubes 12 in each of which a separate optical fibre 11 is loosely housed.
The optical cable element has a plastics tape
14 helically lapped around the assembly of tubes to hold them together. A substantially circumferentially rigid flexible tube 15 of the same composition as that of the tube 5 of the optical cable shown in Fig. 1 surrounds the taped optical cable element and a protective sheath 17 of plastics material surrounds the circumferentially rigid tube.
The third preferred form of optical cable shown in Fig. 3 comprises a substantially circumferentially rigid flexible tube 25 of the same composition as that of the tube 5 of the optical cable shown in Fig. 1 which is lined with a congitudinally applied, transversely folded paper tape 24 and in the bore of which is loosely housed an optical fibre ribbon structure 21. The circumferentially rigid tube 25 is surrounded by a protective sheath 27 of plastics material.
The fourth preferred form of optical cable shown in Fig. 4 comprises a substantially circumferentially rigid flexible tube 35 of composite form which comprises a plurality of elongate flexible bodies 36, each of a cross-section approximating to a sector of an annulus, helically laid-up together. Each of the elongate bodies 36 is of the same composition as that of the tube 5 of the optical cable shown in
Fig. 1. The circumferentially rigid tube 35 is lined with a longitudinally applied, transversely folded paper tape 34. An optical fibre ribbon structure 31 is loosely housed in the bore of the circumferentially rigid tube 35 and the tube is surrounded by a protective sheath 37 of plastics material.
In each of the optical cables shown in Figs.
3 and 4, the optical fibre ribbon structure may comprise a plurality of optical fibres and at least one flexible elongate reinforcing element of substantially resilient material arranged sideby-side and embedded in an elongate body of plastics material, the or each resilient reinforcing element being set in such a form that the ribbon structure follows a path of smoothly curved undulations whose axes of curvature lie transverse to the longitudinal axis of the ribbon structure, the arrangement being such that, when the undulating ribbon structure is subjected to a tensile force, the ribbon structure straightens in a lengthwise direction against the action of the undulating resilient reinforcing element or elements thereby reducing the tensile force applied to the optical fibres and, when the tensile force is removed, the ribbon structure returns towards its original undulating form.
Claims (18)
1. An optical cable comprising a substantially circumferentially rigid flexible tube which throughout substantially the whole af, íts length and cross-sectional area is made of a composition comprising a multiplicity of longitudinally stressed elongate flexible non-metallic reinforcing elements each substantially encapsulated in extruded plastics material; an outer protective sheath of non-metallic material surrounding the circumferentially rigid tube; and, housed in the bore of and movable relative to the circumferentially rigid tube, at least one flexible optical guide.
2. An optical cable comprising a substantially circumferentially rigid flexible tube which is of composite form and comprises a plurality of elongate flexible bodies helically laid-up together, each of which bodies throughout substantially the whole of its length and crosssectional area is made of a composition comprising a multiplicity of longitudinally stressed elongate flexible non-metallic reinforcing elements each substantially encapsulated in extruded plastics material; an outer protective sheath of non-metallic material surrounding the circumferentially rigid tube; and, housed in the bore of and movable relative to the circumferentially rigid tube, at least one flexible optical guide.
3. An optical cable as claimed in Claim 2, wherein each elongate body of the circumferentially rigid tube is of a cross-section approximating to a sector of an annulus.
4. An optical cable as claimed in any one of the preceding Claims, wherein at any position along the length of the optical cable the proportion of non-metallic reinforcing elements in the composition of the or each elongate body of the circumferentially rigid tube lies in the range 60 to 70%.
5. An optical cable as claimed in any one of the preceding Claims, wherein the nonmetallic reinforcing elements in the composition of the or each elongate body of the circumferentially rigid tube extend helically of the body with a long length of lay.
6. An optical cable as claimed in any one of the preceding Claims, wherein the circumferentially rigid tube has an overall diameter lying in the range 10 to 20mm and an internal diameter lying in the range 5 to 10mm and the multiplicity of longitudinally stressed elongate flexible non-metallic reinforcing elements encapsulated in the extruded plastics material of the or each elongate body of the tube extend helically of the body with a lay length lying in the range 50 to 300mm.
7. An optical cable as claimed in any one of the preceding Claims, wherein the longitudinally stressed, elongate flexible non-metallic reinforcing elements of said composition are made of an aromatic polyamide.
8. An optical cable as claimed in any one of the preceding Claims, wherein the plastics material of said composition in which the nonmetallic reinforcing elements are encapsulated is a thermoplastics material.
9. An elongate flexible core as claimed in any one of Claims 1 to 7, wherein the plastics material of said composition in which the nonmetallic reinforcing elements are encapsulated is a thermosetting plastics material.
10. An optical cable as claimed in any one of Claims 1 to 7, wherein the plastics material of said composition in which the non-metallic reinforcing elements are encapsulated is a thermotropic liquid crystalline polymer.
11. An optical cable as claimed in any one of the preceding Claims, wherein the or each flexible optical guide is a separate optical fibre.
12. An optical cable as claimed in any one of Claims 1 to 10, wherein the or each flexible optical guide is an optical bundle as hereinbefore defined.
13. An optical cable as claimed in any one of Claims 1 to 10, wherein the or each flexible optical guide is an optical fibre ribbon structure.
14. An optical cable as claimed in any one of Claims 1 to 10, wherein the circumferentially rigid tube tightly surrounds an optical cable element comprising an assembly of separately formed tubes of plastics material, in at least one of which at least one separate optical fibre, optical bundle, optical fibre ribbon structure or other flexible optical guide is loosely housed.
15. An optical cable as claimed in Claim 14, wherein the optical cable element comprises a plurality of separately formed plastics tubes helically wound around a central flexible elongate member of non-metallic material.
16. An optical cable as claimed in any one of Claims 13 to 15, wherein the or each opti cal fibre ribbon structure comprises a plurality of optical fibres and at least one flexible elongate reinforcing element of substantially resilient material arranged side-by-side and embedded in an elongate body of plastics material, the or each resilient reinforcing element being set in such a form that the ribbon structure follows a path of smoothly curved undulations whose axes of curvature lie transverse to the longitudinal axis of the ribbon structure, the arrangement being such that, when the undulating ribbon structure is subjected to a tensile force, the ribbon structure straightens in a lengthwise direction against the action of the undulating resilient reinforcing element or elements thereby reducing the tensile force applied to the optical fibres and, when the tensile force is removed, the ribbon structure returns towards its original undulating form.
17. An optical cable as claimed in any one of the preceding Claims, wherein the outer protective sheath is of plastics material.
18. An optical cable substantially as hereinbefore described with reference to and as shown in any one of Figs. 1 to 4 of the accompanying drawing.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB868602107A GB8602107D0 (en) | 1986-01-29 | 1986-01-29 | Optical cable |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB8701986D0 GB8701986D0 (en) | 1987-03-04 |
| GB2185828A true GB2185828A (en) | 1987-07-29 |
| GB2185828B GB2185828B (en) | 1989-12-06 |
Family
ID=10592115
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB868602107A Pending GB8602107D0 (en) | 1986-01-29 | 1986-01-29 | Optical cable |
| GB8701986A Expired GB2185828B (en) | 1986-01-29 | 1987-01-29 | Optical cable incorporating a composite circumferentially rigid, flexible tube |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB868602107A Pending GB8602107D0 (en) | 1986-01-29 | 1986-01-29 | Optical cable |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN1015938B (en) |
| GB (2) | GB8602107D0 (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2215084A (en) * | 1988-02-23 | 1989-09-13 | Stc Plc | Optical fibre ribbon containing cables |
| GB2217872A (en) * | 1988-04-06 | 1989-11-01 | Bicc Plc | Manufacture of a circumferentially rigid flexible tube for an optical cable. |
| GB2193583B (en) * | 1986-08-07 | 1990-05-16 | Telephone Cables Ltd | Optical cables |
| EP0382379A2 (en) * | 1989-02-06 | 1990-08-16 | Telephone Cables Limited | Optical fibre cable core for submarine use |
| GB2240189A (en) * | 1990-01-17 | 1991-07-24 | Telephone Cables Ltd | Optical cables |
| US5148509A (en) * | 1991-03-25 | 1992-09-15 | Corning Incorporated | Composite buffer optical fiber cables |
| US5201020A (en) * | 1990-11-08 | 1993-04-06 | Corning Incorporated | Reinforced protective tube for optical waveguide fibers |
| AT2039U1 (en) * | 1996-01-22 | 1998-03-25 | Oekw Oesterreichische Kabelwer | Fiber optic cable |
| US6449412B1 (en) * | 1998-06-30 | 2002-09-10 | Corning Cable Systems Llc | Fiber optic ribbon interconnect cable |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPWO2013100078A1 (en) * | 2011-12-27 | 2015-05-11 | 住友電気工業株式会社 | Optical cable |
| CN104777619B (en) * | 2014-01-09 | 2018-11-30 | 山东华光光电子股份有限公司 | A kind of fiber coupling output laser light spot homogenizing device and preparation method thereof |
| CN108802936B (en) * | 2018-07-05 | 2020-06-12 | 杭州富通通信技术股份有限公司 | Radiation-resistant and bending-resistant reinforced optical cable |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4078853A (en) * | 1976-02-25 | 1978-03-14 | Bell Telephone Laboratories, Incorporated | Optical communication cable |
| GB1584248A (en) * | 1977-08-26 | 1981-02-11 | Bicc Ltd | Optical guides |
| US4446686A (en) * | 1982-09-02 | 1984-05-08 | At&T Technologies, Inc. | Methods of and apparatus for controlling core-to-sheath length ratio in lightguide fiber cable and cable produced by the methods |
| EP0126509A2 (en) * | 1983-05-19 | 1984-11-28 | Philips Patentverwaltung GmbH | Optical cable element or cable, and method of making it |
| EP0137079A1 (en) * | 1983-09-08 | 1985-04-17 | Olin Corporation | Method and apparatus for assembling a compact multi-conductor optical fiber communication cable |
-
1986
- 1986-01-29 GB GB868602107A patent/GB8602107D0/en active Pending
-
1987
- 1987-01-29 CN CN87102673.2A patent/CN1015938B/en not_active Expired
- 1987-01-29 GB GB8701986A patent/GB2185828B/en not_active Expired
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4078853A (en) * | 1976-02-25 | 1978-03-14 | Bell Telephone Laboratories, Incorporated | Optical communication cable |
| GB1584248A (en) * | 1977-08-26 | 1981-02-11 | Bicc Ltd | Optical guides |
| US4446686A (en) * | 1982-09-02 | 1984-05-08 | At&T Technologies, Inc. | Methods of and apparatus for controlling core-to-sheath length ratio in lightguide fiber cable and cable produced by the methods |
| EP0126509A2 (en) * | 1983-05-19 | 1984-11-28 | Philips Patentverwaltung GmbH | Optical cable element or cable, and method of making it |
| EP0137079A1 (en) * | 1983-09-08 | 1985-04-17 | Olin Corporation | Method and apparatus for assembling a compact multi-conductor optical fiber communication cable |
Non-Patent Citations (1)
| Title |
|---|
| WO A1 85/00689 * |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2193583B (en) * | 1986-08-07 | 1990-05-16 | Telephone Cables Ltd | Optical cables |
| GB2215084A (en) * | 1988-02-23 | 1989-09-13 | Stc Plc | Optical fibre ribbon containing cables |
| GB2217872A (en) * | 1988-04-06 | 1989-11-01 | Bicc Plc | Manufacture of a circumferentially rigid flexible tube for an optical cable. |
| GB2217872B (en) * | 1988-04-06 | 1991-09-04 | Bicc Plc | Manufacture of a circumferentially rigid flexible tube for an optical cable |
| EP0382379A2 (en) * | 1989-02-06 | 1990-08-16 | Telephone Cables Limited | Optical fibre cable core for submarine use |
| EP0382379A3 (en) * | 1989-02-06 | 1991-12-11 | Telephone Cables Limited | Optical fibre cable core for submarine use |
| GB2240189A (en) * | 1990-01-17 | 1991-07-24 | Telephone Cables Ltd | Optical cables |
| US5201020A (en) * | 1990-11-08 | 1993-04-06 | Corning Incorporated | Reinforced protective tube for optical waveguide fibers |
| US5148509A (en) * | 1991-03-25 | 1992-09-15 | Corning Incorporated | Composite buffer optical fiber cables |
| AT2039U1 (en) * | 1996-01-22 | 1998-03-25 | Oekw Oesterreichische Kabelwer | Fiber optic cable |
| US6449412B1 (en) * | 1998-06-30 | 2002-09-10 | Corning Cable Systems Llc | Fiber optic ribbon interconnect cable |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2185828B (en) | 1989-12-06 |
| CN1015938B (en) | 1992-03-18 |
| GB8701986D0 (en) | 1987-03-04 |
| CN87102673A (en) | 1987-11-04 |
| GB8602107D0 (en) | 1986-03-05 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 20000129 |