GB2184563A - Optical fibre units - Google Patents
Optical fibre units Download PDFInfo
- Publication number
- GB2184563A GB2184563A GB08629919A GB8629919A GB2184563A GB 2184563 A GB2184563 A GB 2184563A GB 08629919 A GB08629919 A GB 08629919A GB 8629919 A GB8629919 A GB 8629919A GB 2184563 A GB2184563 A GB 2184563A
- Authority
- GB
- United Kingdom
- Prior art keywords
- optical fibre
- fibres
- unit according
- fibre unit
- bonded together
- 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- Withdrawn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
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
- G02B6/4431—Protective covering with provision in the protective covering, e.g. weak line, for gaining access to one or more fibres, e.g. for branching or tapping
-
- 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
- G02B6/4403—Optical cables with ribbon 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
- G02B6/4407—Optical cables with internal fluted support member
-
- 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
- G02B6/4479—Manufacturing methods of optical cables
- G02B6/4482—Code or colour marking
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
Abstract
An optical fibre unit comprises a plurality of optical fibres 1, each with a protective coating 3, bonded together to form a flexible assembly for example by impregnating the interstices with wax or a thermoplastics material 2, or alternatively by lashings in the form of a filament or tape wound helically around the fibres. The element may further comprise a flexible strength element 4 or may be formed in a ribbon shape (Figure 4) or stack (Figure 5). Each unit may then be housed in a cable structure, Figures 7 and 8. <IMAGE>
Description
SPECIFICATION
Optical fibre units
This invention relates to optical fibre units and to optical fibre cables incorporating such units. Optical fibres at present produced are usually provided with a protective coating, for example of synthetic resin, commonly called a primary coating.
According to one aspect of the invention an optical fibre unit comprises a plurality of optical fibres each with a primary coating, and the coated fibres are bonded togetherto form a compactflexible assembly.
The fibres may be bonded together by impregnating the interstices between the fibres with a thermoplastics material,forexample an EVAtype plastic, or a wax, which adheres to the fibre coatings. The bonding material should, of course, have a melting point sufficiently high to be retained within the fibre interstices during any subsequent processing ofthe optical fibre assembly, for example on the application of an extruded thermoplastic sheath around the fibre unit during manufacture of an optical fibre cable incorporating the fibres. A microcrystalline wax having a melting point of the order of 80"C has been found particularly suitable for this purpose.The use of such a substance as the bonding material is especially advantageous as it enables the ends ofthe fibres to be readily separated when required, which may sometimes be necessary, for example,forconnection to other fibres.
The fibres may be bonded together in the form of a bundle, and in such a case they may be alternatively secured to each other by one or more lashings wound helicallyaround the fibre bundle. The or each lashing, which may be in the form of a filament or tape, is preferablysecured to thefibre bundle bya suitable adhesive. In this case a lubricating material may be provided between the fibres.
The fibres forming the bundle may extend parallel to the bundle axis or may be disposed in a helical or periodically reversing helical fashion aboutthe bundle axis.
In some cases they may be disposed, preferably uniformly,around a centralflexiblefilamentof larger diameter, for example of nylon. This gives a more stable arrangement, with improved flexibility and also reduces the likelihood ofthe fibres themselves being subjected totensile stress.
However the fibres may in some cases be bonded together in the form of a ribbon, preferably by means of a wax, and a plurality of such ribbons may be superposed on top of each otherto form a stack. The individual ribbons may also be bonded together by means of a wax if desired.
Several different embodiments of the invention will now be described by way of example with referenceto Figures 1 to 8 ofthe accompanying schematic drawings, in which
Figures 1 to 5 represent cross sections through three different forms of optical fibre unit in accordance with the invention,
Figure 6 illustrates a side view of an alternative form of optical fibre unit, and
Figures 7and 8 represent two differentforms of
optical fibre cable suitable for incorporating optical fibre units in accordance with the invention.
Thus, referring first to Figure 1, the optical fibre unit illustrated comprises seven optical fibres 1 hav
ing a primary resin coating and arranged in a com
pact bundle, the fibres being bonded together by
means of a microcrysta I li ne wax 2 such as that sold
by CERESE Ltd with a melting point of about 78"to 80"C, the wax being impregnated into the interstices
between the fibres, and being sufficiently adhesive to secure the fibres together, but enabling the ends of the fibres to be readily separated when desired, for example forcoupling to otherfibres. The resin coat- ings 3 of the fibres are preferably differently coloured for identification purposes.In place of the wax 2, a thermoplastics material, such as an EVAtype plastics, could alternatively be impregnated into the interstices of the fibres so as to provide the bonding medium. Another bonding medium which could be used is a U.V. curable resin.
An alternative form of optical fibre unit, this time incorporating ten optical fibres 1 formed into a bundle is illustrated in Figure 2,thefibres being bon ded together by a suitable bonding medium as at2 which could be any ofthe materials utilised to secure the fibres ofthefirstunit.
Figure 3 represents a cross section ofthe third unit, also comprising ten opticalfibresl,thefibresinthis case being grouped around a central flexiblefilament 4, for example of nylon, of approximately twice the diameterofthefibres, thefibres again being bonded to each other, and additionally to the central fila mentasat2byasuitablebonding medium,forex- ample as previously mentioned.
Figure 4 represents a cross section of an alternativy form of optical fibre unit incorporating fourresin- coated optical fibres 1 disposed side by side and bonded together by means of a microcrystalline wax 2 to form a flat ribbon-like assembly.
Several such ribbons 15,forexamplefouras shown in Figure 5, may be stacked one on top ofthe other and lightly secured together, for example also by means of wax, to form a 4x4 array.
However different numbers of ribbons may be stacked together, and ribbons having asimilarcon- struction to that illustrated in Figure 5, may incorporate different numbers offibres.
The unit illustrated in Fig u re 6 comprises the requi- red number of resin-coated fibres 1, in this case seven, grouped togetherto form a compact bundle 5, and bonded together by means of a helically wound lashing 6 of Kevlar or othersuitable material. The lashing 6 is conveniently bonded to fibres 1 by an adhesive substance, and may be in the form of a selfadhesive tape. By bonding the lashing to the fibres unravelling ofthelashingwhenthefibresarecutis effectively prevented.
One cable accommodating a plurality of optical fibre units as described with reference to any one of
Figures 1 to 6 is illustrated in Figure 7, the cable comprising an extrusion 7 ofthermoplastics material having a central core portion 8 surrounding a central strength member9,fourradiallyextendingfins 10 and an outer cover 11, the core, fins and cover being integral with each other and defining between them four longitudinally extending channels 12.Pre viouslyformed optical fibre units 5, which may be constructed as illustrated in any one of Figures 1 to 6, are introduced into the channels 12 during the extrusion process; where the bonding medium wax or thermoplastics material it will be appreciated that its melting point must be sufficiently high to ensure that it is retained within the interstices between the fibres 1 during the extrusion process. The fibre units 5 are conveniently fed into the channels 12 at a rate faster than the rate atwhich the extrusion 7 is formed so that they follow an undulating path and are loosely accommodated within their respective channels 12.
Each channel 12 may beformed, as shown at 13, with a region extending along the cablewhich isof thinner cross section than the remainder of the wall, enabling itto be more easily cut, broken or pulled away to provide access to a fibre unit 5 within the channel ifthis is required.
The cable illustrated in Figure 8 has a similarconstruction to that of Figure 5, except that thethinned portions 13 ofthe outer cover 11 are replaced by lon gitudinally extending slots 14. These slots permitthe fibre units 5 to be introduced after the extrusion process and also provide ready access to them. In a modification, not shown, each said slot may be covered byan openableflap.
Although in each of Figures 7 and 8 only onefibre unit5 is shown in each ofthe channels 12, in practice several units may be accommodated in the channels if desired. It will be appreciated thatthe extruded assembly with the fibre units contained within it may be surrounded by one or more outer sheaths, which may also be of extruded plastics material possibly incorporating a moisture barrier of plastics coated metal foil.
Awater-blocking and/or hydrogen trapping material, preferably in powder form may be included within each ofthe channels if desired.
Itwill also beappreciatedthatthefibre units in accho dance with the invention can be accommodated in other forms of cable structures.
Claims (20)
1. An opticalfibre unit comprising a plurality of optical fibres each with a primary coating, wherein the coated fibres are bonded together to form a compact flexible assembly.
2. An optical fibre unitaccordingto Claim 1 wherein the fibres are bonded together by a thermoplastics material which adheres to the fibre coatings.
3. An optical fibre unitaccordingto Claim 1 wherein the fibres are bonded together by a wax which adheres to the fibre coatings.
4. An optical fibre unit according to Claim 2 wherein the thermoplastics material is an EVAtype plastic.
5. An optical fibre unit according to Claim 3 wherein the bonding material is a microcrystalline wax having a melting point ofthe order of 80 C.
6. An optical fibre unit according to Claim 1 wherein the fibres are bonded together by one or more lashings wound helically around the assembled fibres.
7. An optical fibre unit according to Claim 6 wherein the or each lashing is secured to thefibre assembly byan adhesive.
8. An optical fibre unit according to Claim 6 or7 wherein the or each lashing is intheform ofafilamentor tape.
9. An optical fibre unit according to any of Claims 6 to 8 wherein a lubricating material is provided between the fibres.
10. An optical fibre unit according to anyof Claims 1 to 9 wherein the fibres extend parallel to the axis ofthe unit.
11. An optical fibre unit according to any of
Claims 1 to 9 wherein the fibres are disposed in a helical or periodically reversing helical fashion about the axis of the unit.
12. An optical fibre unit according to Claim 11 wherein the fibres are disposed around a central flexible filament of larger diameter.
13. An optical fibre unit according to Claim 12 wherein the fibres are disposed uniformly around the central filament.
14. An optical fibre unit according to Claim 12 or 13 wherein the central filament is composed of nylon.
15. An optical fibre unit according to Claim 1, 3Or 5 in which the fibres are bonded together side by side in the form of a ribbon.
16. An optical fibre unit according to Claim 15 wherein a plurality of said ribbons are superposed on each other to form a stack.
17. An optical fibre unit according to Claim 16 wherein the ribbons are bonded together.
18. An optical fibre unit substantially as hereinbefore described with reference to any one of Figures 1 to 6 ofthe accompanying drawings.
19. An optical cable incorporating oneor more optical fibre units according to any preceding Claim.
20. An optical cable according to Claim 19 constructed substantially as shown in and as here it before described with reference to Figure 7 or 8 of the accompanying drawings.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB858531673A GB8531673D0 (en) | 1985-12-23 | 1985-12-23 | Optical fibre units |
Publications (2)
Publication Number | Publication Date |
---|---|
GB8629919D0 GB8629919D0 (en) | 1987-01-28 |
GB2184563A true GB2184563A (en) | 1987-06-24 |
Family
ID=10590214
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB858531673A Pending GB8531673D0 (en) | 1985-12-23 | 1985-12-23 | Optical fibre units |
GB08629919A Withdrawn GB2184563A (en) | 1985-12-23 | 1986-12-15 | Optical fibre units |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB858531673A Pending GB8531673D0 (en) | 1985-12-23 | 1985-12-23 | Optical fibre units |
Country Status (1)
Country | Link |
---|---|
GB (2) | GB8531673D0 (en) |
Cited By (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2215081A (en) * | 1988-02-11 | 1989-09-13 | Stc Plc | Optical fibre cable |
EP0349206A2 (en) * | 1988-06-30 | 1990-01-03 | AT&T Corp. | Bonded array of transmission media |
EP0385682A2 (en) * | 1989-02-28 | 1990-09-05 | AT&T Corp. | Stable package of elongated strand material and methods of and apparatus for providing same |
EP0417384A2 (en) * | 1989-08-11 | 1991-03-20 | KABEL RHEYDT Aktiengesellschaft | Optical cable |
EP0429238A2 (en) * | 1989-11-13 | 1991-05-29 | Minnesota Mining And Manufacturing Company | Self-supporting coil of optical fiber and method of forming the coil |
EP0495400A2 (en) * | 1991-01-17 | 1992-07-22 | Siemens Aktiengesellschaft | Optical cable and method of its production |
FR2698181A1 (en) * | 1992-10-21 | 1994-05-20 | Northern Telecom Ltd | Optical fiber cable and its manufacturing process |
FR2706046A1 (en) * | 1993-06-02 | 1994-12-09 | Siemens Ag | Optical cable, method for its manufacture and device for implementing the method. |
US5908873A (en) * | 1995-12-20 | 1999-06-01 | Borden Chemicals, Inc. | Peelable bonded ribbon matrix material; optical fiber bonded ribbon arrays containing same; and process for preparing said optical fiber bonded ribbon arrays |
EP1018662A2 (en) * | 1999-01-07 | 2000-07-12 | Alcatel | Optical cable |
EP1235087A2 (en) * | 2000-12-27 | 2002-08-28 | CCS Technology, Inc. | Fiber optic cable assembly and method of making same |
EP1237027A2 (en) * | 2001-02-28 | 2002-09-04 | Asahi Glass Company, Limited | Optical fiber cable with central support member having lobe structure |
US7136556B2 (en) | 2002-08-10 | 2006-11-14 | Emtelle Uk Limited | Signal transmitting cable |
Citations (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1423590A (en) * | 1973-01-19 | 1976-02-04 | Siemens Ag | Communications cables |
US4011007A (en) * | 1971-06-28 | 1977-03-08 | American Optical Corporation | Optical fiber bundle image conduit |
GB1570624A (en) * | 1975-12-11 | 1980-07-02 | Western Electric Co | Optical fibre transmission arrangements |
EP0015425A2 (en) * | 1979-02-28 | 1980-09-17 | Siemens Aktiengesellschaft | Stranding element for optical cables |
GB1578680A (en) * | 1977-05-31 | 1980-11-05 | Siemens Ag | Ribbon-type cables |
GB2069746A (en) * | 1980-02-19 | 1981-08-26 | Standard Telephones Cables Ltd | Communications cables |
DE3232413A1 (en) * | 1982-08-27 | 1984-03-01 | Siemens AG, 1000 Berlin und 8000 München | Filling compound for a longitudinally watertight optical telecommunications cable |
GB2144556A (en) * | 1983-06-07 | 1985-03-06 | Int Standard Electric Corp | Optical fibre cable |
EP0165632A2 (en) * | 1984-05-23 | 1985-12-27 | Koninklijke Philips Electronics N.V. | Optical flat type cable, method of manufacturing same, and an optical cable composed of several flat type cables |
GB2161618A (en) * | 1984-07-13 | 1986-01-15 | Telephone Cables Ltd | Optical fibre cables |
GB2164198A (en) * | 1984-09-05 | 1986-03-12 | Telephone Cables Ltd | Cables |
-
1985
- 1985-12-23 GB GB858531673A patent/GB8531673D0/en active Pending
-
1986
- 1986-12-15 GB GB08629919A patent/GB2184563A/en not_active Withdrawn
Patent Citations (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4011007A (en) * | 1971-06-28 | 1977-03-08 | American Optical Corporation | Optical fiber bundle image conduit |
GB1423590A (en) * | 1973-01-19 | 1976-02-04 | Siemens Ag | Communications cables |
GB1570624A (en) * | 1975-12-11 | 1980-07-02 | Western Electric Co | Optical fibre transmission arrangements |
GB1578680A (en) * | 1977-05-31 | 1980-11-05 | Siemens Ag | Ribbon-type cables |
EP0015425A2 (en) * | 1979-02-28 | 1980-09-17 | Siemens Aktiengesellschaft | Stranding element for optical cables |
GB2069746A (en) * | 1980-02-19 | 1981-08-26 | Standard Telephones Cables Ltd | Communications cables |
DE3232413A1 (en) * | 1982-08-27 | 1984-03-01 | Siemens AG, 1000 Berlin und 8000 München | Filling compound for a longitudinally watertight optical telecommunications cable |
GB2144556A (en) * | 1983-06-07 | 1985-03-06 | Int Standard Electric Corp | Optical fibre cable |
EP0165632A2 (en) * | 1984-05-23 | 1985-12-27 | Koninklijke Philips Electronics N.V. | Optical flat type cable, method of manufacturing same, and an optical cable composed of several flat type cables |
GB2161618A (en) * | 1984-07-13 | 1986-01-15 | Telephone Cables Ltd | Optical fibre cables |
GB2164198A (en) * | 1984-09-05 | 1986-03-12 | Telephone Cables Ltd | Cables |
Cited By (28)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2215081B (en) * | 1988-02-11 | 1992-05-20 | Stc Plc | Optical fibre communications cable |
GB2215081A (en) * | 1988-02-11 | 1989-09-13 | Stc Plc | Optical fibre cable |
EP0349206A2 (en) * | 1988-06-30 | 1990-01-03 | AT&T Corp. | Bonded array of transmission media |
US4900126A (en) * | 1988-06-30 | 1990-02-13 | American Telephone & Telegraph Co. | Bonded array of transmission media |
EP0349206B1 (en) * | 1988-06-30 | 1999-09-15 | AT&T Corp. | Bonded array of transmission media |
EP0385682A2 (en) * | 1989-02-28 | 1990-09-05 | AT&T Corp. | Stable package of elongated strand material and methods of and apparatus for providing same |
EP0385682A3 (en) * | 1989-02-28 | 1991-01-30 | AT&T Corp. | Stable package of elongated strand material and methods of and apparatus for providing same |
EP0417384A3 (en) * | 1989-08-11 | 1992-01-02 | Aeg Kabel Aktiengesellschaft | Optical cable |
EP0417384A2 (en) * | 1989-08-11 | 1991-03-20 | KABEL RHEYDT Aktiengesellschaft | Optical cable |
EP0429238A2 (en) * | 1989-11-13 | 1991-05-29 | Minnesota Mining And Manufacturing Company | Self-supporting coil of optical fiber and method of forming the coil |
EP0429238A3 (en) * | 1989-11-13 | 1991-07-24 | Minnesota Mining And Manufacturing Company | Self-supporting coil of optical fiber and method of forming the coil |
US5179613A (en) * | 1989-11-13 | 1993-01-12 | Minnesota Mining And Manufacturing Company | Self-supporting coil of optical fiber and method of forming the coil |
EP0495400A2 (en) * | 1991-01-17 | 1992-07-22 | Siemens Aktiengesellschaft | Optical cable and method of its production |
EP0495400A3 (en) * | 1991-01-17 | 1993-01-13 | Siemens Aktiengesellschaft | Optical cable and method of its production |
US5210813A (en) * | 1991-01-17 | 1993-05-11 | Siemens Aktiengesellschaft | Optical cable and method for manufacturing the optical cable |
FR2698181A1 (en) * | 1992-10-21 | 1994-05-20 | Northern Telecom Ltd | Optical fiber cable and its manufacturing process |
FR2706046A1 (en) * | 1993-06-02 | 1994-12-09 | Siemens Ag | Optical cable, method for its manufacture and device for implementing the method. |
US5908873A (en) * | 1995-12-20 | 1999-06-01 | Borden Chemicals, Inc. | Peelable bonded ribbon matrix material; optical fiber bonded ribbon arrays containing same; and process for preparing said optical fiber bonded ribbon arrays |
US6455607B1 (en) | 1995-12-20 | 2002-09-24 | Borden Chemical, Inc. | Peelable bonded ribbon matrix material; optical fiber bonded ribbon arrays containing same; and process for preparing said optical fiber bonded ribbon arrays |
EP1018662A2 (en) * | 1999-01-07 | 2000-07-12 | Alcatel | Optical cable |
EP1018662B1 (en) * | 1999-01-07 | 2006-03-22 | Draka Comteq B.V. | Optical cable |
EP1235087A2 (en) * | 2000-12-27 | 2002-08-28 | CCS Technology, Inc. | Fiber optic cable assembly and method of making same |
EP1235087A3 (en) * | 2000-12-27 | 2004-02-04 | CCS Technology, Inc. | Fiber optic cable assembly and method of making same |
EP1237027A2 (en) * | 2001-02-28 | 2002-09-04 | Asahi Glass Company, Limited | Optical fiber cable with central support member having lobe structure |
EP1237027A3 (en) * | 2001-02-28 | 2004-05-06 | Asahi Glass Company, Limited | Optical fiber cable with central support member having lobe structure |
US6826338B2 (en) | 2001-02-28 | 2004-11-30 | Asahi Glass Company, Limited | Optical fiber cable having a partitioning spacer |
US7136556B2 (en) | 2002-08-10 | 2006-11-14 | Emtelle Uk Limited | Signal transmitting cable |
USRE41388E1 (en) | 2002-08-10 | 2010-06-22 | Emtelle Uk Limited | Signal transmitting cable |
Also Published As
Publication number | Publication date |
---|---|
GB8531673D0 (en) | 1986-02-05 |
GB8629919D0 (en) | 1987-01-28 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US5249249A (en) | Cable utilizing multiple light waveguide stacks | |
US5857051A (en) | High density riser and plenum breakout cables for indoor and outdoor cable applications | |
US5621842A (en) | Optical fiber cable and device for manufacturing a cable of this kind | |
GB2184563A (en) | Optical fibre units | |
JPH08271773A (en) | Optical fiber cable | |
US4312566A (en) | Dielectric optical waveguide cables | |
EP0996016A2 (en) | Optical fibre cable | |
US10914906B2 (en) | Optical fiber cable | |
EP0328409A2 (en) | Optical fibre cables | |
GB2215081A (en) | Optical fibre cable | |
US4984869A (en) | Optical fibre cable and method of making same | |
AU604296B2 (en) | An optical cable | |
JPH08262292A (en) | Coated optical fiber ribbon and optical cable formed by using the same | |
GB2164471A (en) | Optical fibre cables | |
US6625358B2 (en) | Optical fiber cable and a method of fabricating it | |
JP3745921B2 (en) | Optical fiber cable for aerial installation | |
JP3419973B2 (en) | Waterproof cable | |
JPH07218784A (en) | Slot rod and slot unit of optical fiber cable | |
JPH09145968A (en) | Optical fiber cable and its production | |
JPS62258411A (en) | Optical fiber cable and its production | |
GB2184863A (en) | Optical fibre cable | |
JPH11311729A (en) | Optical fiber cable | |
JPH09197205A (en) | Coated optical fiber and optical cable using it | |
JPH0498210A (en) | Slot type optical fiber cable | |
JPH04220612A (en) | High-density optical fiber cable |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |