CN87102673A - Optical cable - Google Patents
Optical cable Download PDFInfo
- Publication number
- CN87102673A CN87102673A CN87102673.2A CN87102673A CN87102673A CN 87102673 A CN87102673 A CN 87102673A CN 87102673 A CN87102673 A CN 87102673A CN 87102673 A CN87102673 A CN 87102673A
- Authority
- CN
- China
- Prior art keywords
- optical cable
- pipe
- plastic material
- deflection
- optical
- 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- Withdrawn
Links
- 230000003287 optical effect Effects 0.000 title claims abstract description 64
- 239000004033 plastic Substances 0.000 claims abstract description 28
- 229920003023 plastic Polymers 0.000 claims abstract description 28
- 239000000463 material Substances 0.000 claims abstract description 27
- 239000000203 mixture Substances 0.000 claims abstract description 24
- 239000013307 optical fiber Substances 0.000 claims abstract description 16
- 239000000835 fiber Substances 0.000 claims abstract description 11
- 238000001125 extrusion Methods 0.000 claims abstract description 6
- -1 polypropylene Polymers 0.000 claims abstract description 5
- 239000004020 conductor Substances 0.000 claims abstract description 4
- 150000004945 aromatic hydrocarbons Chemical class 0.000 claims description 9
- 230000003014 reinforcing effect Effects 0.000 claims description 7
- 239000004952 Polyamide Substances 0.000 claims description 5
- 229920002647 polyamide Polymers 0.000 claims description 5
- 238000007789 sealing Methods 0.000 claims description 5
- 230000002708 enhancing effect Effects 0.000 claims description 4
- 239000012858 resilient material Substances 0.000 claims description 3
- 208000001491 myopia Diseases 0.000 claims description 2
- 239000012815 thermoplastic material Substances 0.000 claims description 2
- 229920001187 thermosetting polymer Polymers 0.000 claims description 2
- 235000004418 Durio kutejensis Nutrition 0.000 claims 1
- 240000002669 Durio kutejensis Species 0.000 claims 1
- 230000004379 myopia Effects 0.000 claims 1
- 229920000271 Kevlar® Polymers 0.000 abstract description 2
- 239000004677 Nylon Substances 0.000 abstract description 2
- 239000004743 Polypropylene Substances 0.000 abstract description 2
- 239000004761 kevlar Substances 0.000 abstract description 2
- 229920001778 nylon Polymers 0.000 abstract description 2
- 229920001155 polypropylene Polymers 0.000 abstract description 2
- 230000003321 amplification Effects 0.000 description 4
- 238000003199 nucleic acid amplification method Methods 0.000 description 4
- 241000272165 Charadriidae Species 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 229920000728 polyester Polymers 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000004974 Thermotropic liquid crystal Substances 0.000 description 1
- 229920003232 aliphatic polyester Polymers 0.000 description 1
- 125000003118 aryl group Chemical group 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- HGAZMNJKRQFZKS-UHFFFAOYSA-N chloroethene;ethenyl acetate Chemical compound ClC=C.CC(=O)OC=C HGAZMNJKRQFZKS-UHFFFAOYSA-N 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 239000005304 optical glass Substances 0.000 description 1
- 229920000343 polyazomethine Polymers 0.000 description 1
- 229920000647 polyepoxide 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
- 239000004814 polyurethane Substances 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 238000007790 scraping Methods 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Images
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
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Light Guides In General And Applications Therefor (AREA)
- Rigid Pipes And Flexible Pipes (AREA)
Abstract
A kind of optical cable is particularly suitable for as aerial optical cable.It comprises the flexible tubing 25 of a Guan Zhouwei rigidity, and this pipe runs through the optical cable total length, and its xsect is made of a kind of composition.Said composition comprises the enhanced non-metallic component of the deflection of a plurality of longitudinal stress elongations, for example: Kai La (Kevlar).Each strengthens element all by the plastic material of extrusion modling, and for example polypropylene or nylon seal securely.Flexible tubing is wrapped with nonmetallic protection sheath body 27, and the optical conductor 21 of a flexibility is housed in the pipe at least, for example, and simple optical fiber, light carrier bundle or fiber optic ribbon thing.The relative pipe of this optical conductor is mobilizable.
Description
The present invention relates to the optical cable of transmission usefulness in ultraviolet ray, visible light and the infrared ray electromagnetism wavelength coverage.For simplicity, will comprise this frequency range with generic term " light " below.Present invention is specifically related to (but not being exclusive) and be used for communication field, be suitable for the optical cable of the light transmission of 0.8～2.1 micron wave length scope.
An object of the present invention is to provide a kind of improved optical cable, its special (but not being exclusive) is applicable to as a kind of aerial optical cable.
According to the present invention, improved optical cable comprises that runs through an optical cable total length substantially, Zhou Fangxiang is the flexible tubing of rigidity at pipe, its xsect is made of a kind of composition, said composition comprises a plurality of elasticity enhanced non-metallic components in the longitudinal stress elongation, and each element all is sealed in the plastic material of extrusion molding securely; A kind of outer protection cover of nonmetallic materials is wrapped on all rigid pipes of pipe; And the optical conductor of at least one flexibility is placed in the center pit of pipe of all rigidity of pipe, and this pipe can be movable relatively.
Because running through the total length and the xsect of optical cable substantially, make by all rigid pipes of pipe, so a plurality of enhanced non-metallic component is evenly distributed on the entire cross section of pipe substantially by above-mentioned composition.
Because being placed on that root or those flexible light guide bodies of all rigid pipes of pipe inside is mobilizable with respect to this pipe, like this, when improved optical cable waves, vibration or when other deflections take place, for example, when the built on stilts use of optical cable, because stilt far and freely hangs at interval, and when being subjected to wind and scraping, Na Gen or those flexible light guide bodies and manage between all rigid pipes and just limited relative motion can take place.
The pipe week rigid pipe that improves optical cable can be a kind of single elongated tubular of being made by above-mentioned composition; Or in the occasion of needs height deflection, it also can be a kind of array configuration that includes a plurality of elongated flexible bodies, each is all made these elongated flexible bodies by above-mentioned composition, fit together to spirality, each slender bodies preferably has the xsect of an almost fan that cuts out on the garden ring.
On any position of cable length, to make in the composition of single or a plurality of slender bodies of managing all rigid pipes, the ratio of enhanced non-metallic component is preferably between 60～70%, and these enhanced non-metallic components preferably are drawn into the conveyor screw of long lay.
For example, external diameter at all rigid pipes of pipe may be between 10 to 20 millimeters, internal diameter is between 5 to 10 millimeters the time, the elasticity enhanced non-metallic component of a plurality of longitudinal stress elongations in the plastic material that is sealed in extrusion modling in single or a plurality of slender bodies of pipe preferably is drawn into the conveyor screw with 50～300 millimeters lay lengths.
The elasticity enhanced non-metallic component of the longitudinal stress elongation in the above-mentioned composition is preferably by making for the polyamide of " Kai La " aromatic hydrocarbon (Kevlar) such as the trade name of selling; They also can select the nonmetallic materials that comprise that non-optical glass and carbon are made for use.
Be used for sealing preferably a kind of thermoplastic of plastic material of the enhanced non-metallic component in the above-mentioned composition, such as, polypropylene or nylon.But in some cases, also a kind of thermoset plastic material, such as, polyester or epoxy resin, or polyurethane.
Other plastic material also can be used for sealing enhanced non-metallic component, they are thermotropic liquid crystal condensates, for example, the polyester of complete aromatic hydrocarbon, the aliphatic polyester of aromatic hydrocarbon, the polyazo methine of aromatic hydrocarbon, the polyesteramide of the polyester of aromatic hydrocarbon-carbonate ester and complete or non-complete aromatic hydrocarbon.
One aspect of the present invention is Na Gen or those flexible light guide bodies, and it can comprise an independent optical fiber, one as the light carrier bundle of hereinafter definition or the ribbon of an optical fiber structure.
So-called " light carrier bundle " refers to one group of optical fiber, or a group of fibers that comprises one or more optical fiber and one or more non-optical fortifying fibre or other enhancing elongated member.
Another aspect of the present invention is the pipe of Guan Zhouwei rigidity.It can be enclosed within on the optical cable components tightly, this optical cable components comprises one group of a plurality of pipe that formed respectively by plastic material, wherein have at least a pipe loosely to lay at least one independent optical fiber, a light carrier bundle, a fiber optic ribbon thing or a kind of other forms of flexible light guide body.The present invention preferential embodiment in this respect is that optical cable components comprises a plurality of plastic tubes that are formed separately, these pipe spirality ground are on the center elongated member of the deflection of nonmetallic materials, for example, on the elongated member of making for " Kai La " a kind of aromatic hydrocarbon polyamide nonmetallic materials (Kerlar) around the trade name that resembles sale.
In all cases, if that root or those flexible light guide bodies of improved optical cable are fiber optic ribbon things, this fiber optic ribbon thing preferably has our BrP 2141558B number the same structure.This structure comprises that multifiber and at least one are the elongated enhancing element of the deflection of resilient material substantially, and they are all laid abreast and imbed in the slender bodies of a plastic material.There, these elastic reinforcing elements are placed in such a way, and ribbon extends along the waveform passage of smooth curved, and the curvature axes of coordinates of passage is on the position of longitudinal axis of transversal ribbon.This structure makes the waveform ribbon when being subjected to tension force, will revolt the vertically stretching of acting force at the waveform elastic reinforcing element, and reduce to be applied to the tension force on the optical fiber whereby, and when tension force was removed, banded structure recovered original wave-like.
Improving the outer protection sheath body of optical cable can make with any appropriate plastic material, preferably adopts tygon.
With the example of four kinds of optimised forms that improve optical cable, the present invention is further described below with reference to accompanying drawing, wherein:
Fig. 1 is the cross-sectional view of amplification of first kind of optimised form of optical cable.
Fig. 2 is the cross-sectional view of amplification of second kind of optimised form of optical cable.
Fig. 3 is the cross-sectional view of amplification of the third optimised form of optical cable.
Fig. 4 is the cross-sectional view of amplification of the 4th kind of optimised form of optical cable.
First kind of optimised form of optical cable as shown in Figure 1, it comprises four plastic tubes 2, the loose independent optical fiber 1 of placing in each pipe, several spiral the fitting together of pipe, thus form an optical cable components, at its spiral plastic tape 4 that is wound with in outside.This optical cable components that twines with band is with the flexible tubing 5 of an all rigidity of firm pipe, and this pipe runs through the total length of optical cable substantially, and its xsect is made of a kind of composition.It comprises that the aromatic hydrocarbon polyamide of a plurality of deflections in longitudinal stress elongation strengthens element, they extend into the spiral pipe with long lay, and each element is all by in the firm thermoplastic material that is sealed in extrusion modling, and the ratio that strengthens element in the composition accounts between 60～70%.The protective sleeve 7 of plastic material is wrapped in all rigid pipes 5 of pipe.Because each root optical fiber 1 all is that loosely is placed in the plastic tube 2 of optical cable components, is mobilizable so every optical fiber is managed all rigid pipes 5 relatively.
Second kind of optimised form of optical cable as shown in Figure 2, optical cable components comprises the elongated center reinforcing member 13 of a deflection of being made by resin-bonded aromatic hydrocarbon polyamide, around it be six plastic tubes 12 that spirality is placed, in each pipe all loosely be placed with an independent optical fiber 11.Optical cable components has a plastic tape 14, round this group pipe spirality overlapping winding in ground, so that they are twined together.The optical cable components that this usefulness band twines be with one identical with cable sleeve shown in Figure 15 compositions, the flexible tubing 15 of strong Guan Zhouwei rigidity, and have the protection sheath body 17 of a plastic material to be wrapped in this to manage on all rigid pipes.
The third optimised form of optical cable as shown in Figure 3, it comprise one identical with cable sleeve shown in Figure 15 compositions, strong pipe week rigidity flexible tubing 25, it is lined with one and vertically uses, the paper tape 24 that has transverse fold is placed with a fiber optic ribbon thing 21 at the tube hub loosely.The pipe 25 of managing all rigidity is enclosed with a plastic protective sleeve shell 27.
The 4th kind of optimised form of optical cable as shown in Figure 4, it comprises the flexible tubing 35 of a strong Guan Zhouwei rigidity, it is combined by a plurality of elongated deflection bodies 36, and each elongated flexible body all has the fan-shaped xsect of a near-sighted garden ring, and they by spiral device together.Each slender bodies 36 has with the same composition of the sleeve pipe 5 of optical cable shown in Figure 1.The pipe 35 of managing all rigidity is lined with a paper tape that has transverse fold 34 that vertically uses, and lays a fiber optic ribbon thing at the center of this pipe loosely, and the protection sheath body 37 of a plastic material is arranged in the coated outside of this pipe.
In Fig. 3 and each optical cable shown in Figure 4, the fiber optic ribbon thing can be made up of multifiber and at least one elongated enhancing element that is substantially the deflection of resilient material, in their slender bodies of laying and imbedding a plastic material side by side.These elastic reinforcing elements are placed by this way, and ribbon is extended along the waveform passage of smooth curved, and make the curvature axes of coordinates of passage be in the position of transversal ribbon longitudinal axis.This structure makes the waveform ribbon when being subjected to tension force, will the resistance acting force of waveform elastic reinforcing element vertically on stretching, reduced to be applied to the tension force on the optical fiber whereby.When tension force was removed, ribbon recovered original waveform.
Claims (17)
1, a kind of optical cable comprises one at the pipe flexible tubing that radially is roughly rigidity (5 in week; 15; 25; 35; ); The outer jointing jacket shell (7 of the nonmetallic materials of an all radial rigidity pipe of parcel pipe; 17; 27; 37); And at least one be placed on all radial rigidity tube hubs of pipe and relative optical conductor (1 of the mobilizable flexibility of this pipe; 11; 21; 31); Be characterised in that, manage all rigid pipes and run through the total length of optical cable substantially, and its xsect is made by composition, and said composition comprises the enhanced non-metallic component of the deflection of a plurality of longitudinal stress elongations, and each element is sealed in the plastic material of extrusion molding securely.
2, a kind of optical cable according to claim 1, be characterised in that, the flexible tubing (35) of managing all rigidity is combined to form, the device that it comprises a plurality of elongated deflection body (36) spirality together, each deflection body runs through the optical cable total length substantially, and its xsect is made up of above-mentioned composition.
3, a kind of optical cable as claimed in claim 2 is characterised in that, manages each slender bodies (36) of all rigid pipes (35), and its xsect myopia is fan-shaped in a garden ring.
As the described a kind of optical cable of the arbitrary claim in front, be characterised in that 4, on any position of cable length, the ratio of managing the enhanced non-metallic component that comprises in the composition of arbitrary slender bodies of all rigid pipes is greatly between 60～70%.
5, the described a kind of optical cable of each claim of front is characterised in that, the enhanced non-metallic component in the composition of arbitrary slender bodies of managing all rigid pipes is drawn into the conveyor screw with long lay.
6, the described a kind of optical cable of each claim of front, be characterised in that, manage all rigid pipe external diameters between 10 to 20 millimeters, internal diameter is between 5 to 10 millimeters, the enhanced non-metallic component of the deflection of a plurality of longitudinal stress elongations in the plastic material that is sealed in extrusion modling in arbitrary slender bodies of pipe is drawn into the conveyor screw with 50 to 300 millimeters laies.
7, the described a kind of optical cable of each claim of front is characterised in that the enhanced non-metallic component of the deflection of longitudinal stress elongation in the said composition is to be made by the polyamide of aromatic hydrocarbon.
8, the described a kind of optical cable of each claim of front is characterised in that the plastic material of the enhanced non-metallic component in the sealing above-mentioned composition is a kind of thermoplastic material.
9, the core of each described a kind of elongated deflection in the claim 1 to 7, the plastic material that it is characterized in that sealing the enhanced non-metallic component in the above-mentioned composition is a kind of thermoset plastic material.
10, each described a kind of optical cable in the claim 1 to 7 is characterised in that, the plastic material of the enhanced non-metallic component in the sealing above-mentioned composition is a kind of TLCP.
11, the described optical cable of each claim of front is characterised in that the flexible light guide body is an independent optical fiber (1,11).
12, each described a kind of optical cable in the claim 1 to 10.Be characterised in that the flexible light guide body is a light carrier bundle of definition hereinbefore.
13, each described a kind of optical cable in the claim 1 to 10 is characterised in that the flexible light guide body is the ribbon (21 that a kind of optical fiber constitutes; 31).
14, each described a kind of optical cable in the claim 1 to 10 is characterised in that, manages all rigid pipes and tightly is enclosed within on the optical cable components, and this optical cable components comprises one group of plastic tube that is shaped respectively (2; 12) wherein have at least a pipe loosely to lay at least one independent optical fiber, light carrier bundle, fiber optic ribbon thing or other flexible photocons (1; 11).
15, the described a kind of optical cable of claim 14 is characterised in that, optical cable components is wrapped on the center part (13) of elongated nonmetallic materials of a deflection with comprising a plurality of plastic tubes that are formed separately (12) spirality.
16, each described a kind of optical cable in the claim 13 to 15 is characterised in that arbitrary fiber optic ribbon structure (21; 31) comprise that multifiber and at least one are roughly the elongated enhancing element of the deflection of resilient material, they are by placed side by side and imbed in the slender bodies of a plastic material.These elastic reinforcing elements are placed in such a way, ribbon is extended along the waveform passage of smooth curved, and the curvature axes of coordinates that makes passage is in the position of the transversal ribbon longitudinal axis, when such arrangement makes the waveform ribbon be subjected to tension force, will be stretching in vertical generation of the direction of waveform elastic reinforcing element resistance acting force, reduce to be applied to the tension force on the optical fiber thus, and when tension force was removed, ribbon was returned to its original waveform.
17, as the described a kind of optical cable of the arbitrary claim in front, be characterised in that outer protection sheath body (7; 17; 27; 37; ) be plastic material.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8602107 | 1986-01-29 | ||
| GB868602107A GB8602107D0 (en) | 1986-01-29 | 1986-01-29 | Optical cable |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN87102673A true CN87102673A (en) | 1987-11-04 |
| CN1015938B CN1015938B (en) | 1992-03-18 |
Family
ID=10592115
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN87102673.2A Expired CN1015938B (en) | 1986-01-29 | 1987-01-29 | Optical cable |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN1015938B (en) |
| GB (2) | GB8602107D0 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104011574A (en) * | 2011-12-27 | 2014-08-27 | 住友电气工业株式会社 | Optical cable |
| CN104777619A (en) * | 2014-01-09 | 2015-07-15 | 山东浪潮华光光电子股份有限公司 | Optical fiber coupling output laser spot homogenizing device and preparation method thereof |
| CN111505779A (en) * | 2018-07-05 | 2020-08-07 | 杭州富通通信技术股份有限公司 | Radiation-resistant and bending-resistant reinforced optical cable |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB8808039D0 (en) * | 1988-04-06 | 1988-05-05 | Bicc Plc | Manufacture of circumferentially rigid flexible tube for optical cable |
| GB8619308D0 (en) * | 1986-08-07 | 1986-09-17 | Telephone Cables Ltd | Optical cables |
| GB2215084A (en) * | 1988-02-23 | 1989-09-13 | Stc Plc | Optical fibre ribbon containing cables |
| GB8902552D0 (en) * | 1989-02-06 | 1989-03-22 | Telephone Cables Ltd | 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 |
Family Cites Families (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 |
| DE3318233C2 (en) * | 1983-05-19 | 1985-10-31 | Philips Patentverwaltung Gmbh, 2000 Hamburg | Optical cable element or cable and method for its manufacture |
| 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
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104011574A (en) * | 2011-12-27 | 2014-08-27 | 住友电气工业株式会社 | Optical cable |
| CN104777619A (en) * | 2014-01-09 | 2015-07-15 | 山东浪潮华光光电子股份有限公司 | Optical fiber coupling output laser spot homogenizing device and preparation method thereof |
| CN111505779A (en) * | 2018-07-05 | 2020-08-07 | 杭州富通通信技术股份有限公司 | Radiation-resistant and bending-resistant reinforced optical cable |
| CN111505779B (en) * | 2018-07-05 | 2021-06-25 | 杭州富通通信技术股份有限公司 | Radiation-resistant and bending-resistant reinforced optical cable |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1015938B (en) | 1992-03-18 |
| GB8602107D0 (en) | 1986-03-05 |
| GB2185828A (en) | 1987-07-29 |
| GB2185828B (en) | 1989-12-06 |
| GB8701986D0 (en) | 1987-03-04 |
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