EP0985217A1 - Cable de telecommunication hybride - Google Patents

Cable de telecommunication hybride

Info

Publication number
EP0985217A1
EP0985217A1 EP98924671A EP98924671A EP0985217A1 EP 0985217 A1 EP0985217 A1 EP 0985217A1 EP 98924671 A EP98924671 A EP 98924671A EP 98924671 A EP98924671 A EP 98924671A EP 0985217 A1 EP0985217 A1 EP 0985217A1
Authority
EP
European Patent Office
Prior art keywords
cable
optical
diameter
conductors
electric conductors
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Withdrawn
Application number
EP98924671A
Other languages
German (de)
English (en)
Inventor
Nicolaas Jozef KPN Telecom B.V. KERSIC
Leonardus Hubertus Anton KPN Telecom B.V HOUBEN
Arie NKF Kabel B.V. VAN WINGERDEN
Arnoldus Gertrudis Wilhelmus Marie Berkers
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Koninklijke PTT Nederland NV
Koninklijke KPN NV
NKF Kabel BV
Original Assignee
Koninklijke PTT Nederland NV
Koninklijke KPN NV
NKF Kabel BV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Koninklijke PTT Nederland NV, Koninklijke KPN NV, NKF Kabel BV filed Critical Koninklijke PTT Nederland NV
Publication of EP0985217A1 publication Critical patent/EP0985217A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B11/00—Communication cables or conductors
    • H01B11/22—Cables including at least one electrical conductor together with optical fibres
    • 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
    • G02B6/4416—Heterogeneous cables

Definitions

  • the invention lies in the field of cabling in a subscriber-connecting network. More in particular, the invention relates to a hybrid telecommunication cable comprising four electric conductors in quad-group configuration, an optical conductor, and a cable sheath which envelops the electric and optical conductors.
  • the applicant has developed trailing cables and corresponding thin guide tubes .
  • the guide tubes are used in bundles which run from a "curb", and the guide tubes are conducted from the bundles to the separate home connections .
  • the bundles may be laid directly in the soil, but also in larger protecting tubes such as, e.g., those described in reference [1] .
  • a cable is installed in the guide tube corresponding to the home connection.
  • a copper or an optical fibre cable is installed to provide the subscriber to be connected with a copper or an optical fibre connection according to his (capacity) needs.
  • quad cable two pairs of electric conductors in a quad-group configuration
  • the quad cables may be replaced by optical fibre cables .
  • Both types of cables may be provided with a metal screen for electric shielding and waterproofness , and with an enveloping jacket. The dimensions of the cables, and of the guide tubes in which the cables must be installed, are strictly adjusted to one another.
  • the inner diameter (in this case, 5.5 mm) of the guide tube used and the outer diameter (in this case, 4.5 mm) of particularly the quad cable, on the one hand was chosen as small as possible, mainly on account of cost considerations, while on the other hand there was still obtained a sufficient degree of protection and feasibility of installing the cables in the guide tubes.
  • the quality and the mutual position of the cores and of the group within the metal screen are balanced in such a manner that the signal attenuation and cross talk remain within limits imposed.
  • the option of offering, by way of the guide tube in question, both a quad connection and an optical fibre connection to a home connection is not available.
  • hybrid telecommunication cable which, apart from the four copper cores, also comprises at least one optical fibre in such a manner , however , that the outer diameter of the hybrid telecommunication cable is not, at any rate not substantially, larger than that of the said quad cable.
  • Hybrid cables per se are known, in a connecting network, to provide home connections with a quad connection and/or an optical fibre connection.
  • a cable inter alia, whose base bundle consists of one or more copper quads in addition to a bundle of optical fibre cores in a loose or fixed envelope. Of the latter, the outer diameter of course is much too large.
  • a standard SI-POF has a typical sheathing diameter of 1000 ⁇ m (min. /max. 950/1050) and a fixed sheathing ("tight jacket") having a typical diameter of 2.2 mm (min. /max. 2.0/2.4).
  • Reference [4] describes several variants for a hybrid telecommunication cable wherein electric conductors are used which, within the cable core, are mutually insulated from one another by the dielectric properties of the optical conductors lying in between.
  • a hybrid cable of the type referred to above is known therefrom.
  • the optical conductors are standard optical fibres ("loose-tube” or "tight-buffer") .
  • the object of the invention is to provide for a hybrid telecommunication cable which meets the above need.
  • a more general object of the invention is to offer the option of realising hybrid telecommunication cables of the type referred to above for relatively short distances having a more restricted diameter than is possible with standard optical fibres.
  • a hybrid telecommunication cable of the type referred to above according to the invention is characterised as in claim 1.
  • the outer diameter of the insulated electric conductors may remain limited.
  • a preferred embodiment of the cable according to the invention is characterised as in claim 2.
  • optical fibre which is not, or only to an insufficient extent, provided with a fixed protective sheathing.
  • the optical fibre therefore does not meet a standard requirement for protection, such as against all sorts of external influences and against "microbending" having a greater signal attenuation as a result.
  • it may make sense to include such an optical fibre in the cable since on the one hand the cable sheathing may offer sufficient protection against external influences, while on the other hand, in the event of using such cables on relatively short distances, as is the case when cabling in buildings or in the last stage of a subscriber connecting network, where the cable length in most cases remains limited to approx.
  • Reference [5] discloses an energy cable having a number of mutually insulated electric conductors having equal, circular-sector-shaped cross sections, enveloped by a cable sheath, one or more optical conductors having been included in the remaining space between the conductors within the cable sheath.
  • a dimensioning problem relating to the optical conductors to be included within the cable sheath is not under discussion. Neither does the inclusion need to take into account a possible disturbance of electrical properties of the electric conductors.
  • FIG. 1 schematically shows, in cross section, a first embodiment of the hybrid cable according to the invention
  • FIG. 2 schematically shows, in cross section, a variant of the first embodiment according to FIG. 1
  • FIG. 3 schematically shows, in cross section, a second embodiment of the hybrid cable according to the invention
  • FIG. 4 schematically shows, in cross section, a variant of the second embodiment according to FIG . 3.
  • FIG. 1 schematically shows, in part (a), a cross section of a hybrid cable and, in part (b) , the same cross section in which the diameters of the various cable parts are designated.
  • the cable comprises a jacket 1 and a cable core 2.
  • the jacket consists of an outer jacket 1.1 and an inner jacket 1.2 having therebetween a metal water shield 1.3.
  • the water shield is made of, e.g., Al film, while the inner jacket is formed by a layer of, e.g., polyester and the outer jacket of HDPE (high-density polyethylene).
  • An inner jacket may be left out, if so desired.
  • the cable core 2 includes four electric conductors 3.1 to 3.4 inclusive in a quad-group configuration, hereinafter also referred to as quad group 3.
  • Each electric conductor comprises a copper core 4, surrounded by a PE-foam skin 5.
  • Said foam skins not only serve as protection and electric insulation, but also as spacers between the electric conductors within the cable jacket.
  • the cable jacket fits tightly around the quad group, in such a manner that the cable core has a substantially circular cross section.
  • a central cavity 6 between the electric conductors houses an optical conductor 7 whose cross section is shown in part (c) of FIG. 1.
  • an optical conductor 7 having a diameter d 3 exactly fits in the central cavity 6 of four electric conductors 3.1 to 3.4 inclusive having equal circular cross sections whose diameter d 2 is a factor (1 + V2) greater than the diameter d 3 of the optical conductor.
  • optical conductor 7 there may be used both an optical glass fibre and a plastic optical fibre (POF) .
  • the optical conductor 7 is an optical fibre 7.1 which is provided with a (possibly additional) fixed sheathing 7.2, in a similar manner and having similar material as that of a "tight-buffer” or “tight-jacket” of a standard optical fibre, but having a diameter d 3 which is smaller than a standard diameter d 3s .
  • the diameter of a "bare" optical fibre 7.1 is designated by d .
  • the optical fibre 7.1 is a "bare" glass fibre (core, sheathing and primary coating having a standard diameter of 250 ⁇ m)
  • the optical fibre 7.1 is a plastic optical fibre of the "step index" type (SI-POF) (core and sheathing)
  • SI-POF step index
  • FIG. 2 shows a cross section thereof.
  • FIG. 3 and FIG. 4 respectively, show a cross section thereof. There are designated “bare” optical fibres 10 and 11 in the central cavity 6 (FIG. 3) and “bare” optical fibres 10.1 and 11.1 in the peripheral cavity 8.1 (FIG. 4) .
  • the fibres in the helix have a bending radius R b which is given by:
  • the diameter d 3 for an optical fibre may be chosen between a minimum diameter d ⁇ , which is required for optical conduction, and a standard diameter d 3 ⁇ , which is defined for sufficient protection against "microbending" . Therefore :

Abstract

L'invention concerne un câble de télécommunication hybride comportant quatre conducteurs électriques (de 3.1 à 3.4 inclus) disposés dans une configuration équilibrée de groupe à quatre et logés dans une enveloppe de câble (1). Dans une cavité centrale (6) située entre les quatre conducteurs électriques et/ou dans des cavités périphériques (de 8.1 à 8.4 inclus), se trouve un conducteur optique (7). Le conducteur optique est constitué d'une fibre optique (7.1) partiellement épaissie avec un revêtement fixe (7.2) jusqu'à un diamètre maximal (d3) inférieur à un diamètre de référence (d3s). La présente invention présente un avantage en ce que le conduit optique peut être introduit dans le câble sans augmenter le diamètre (d) du câble et perturber l'équilibre de la configuration de groupe à quatre, ou alors il peut faciliter la conception de câbles à diamètre réduit.
EP98924671A 1997-05-29 1998-05-25 Cable de telecommunication hybride Withdrawn EP0985217A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
NL1006165 1997-05-29
NL1006165 1997-05-29
PCT/NL1998/000294 WO1998054732A1 (fr) 1997-05-29 1998-05-25 Cable de telecommunication hybride

Publications (1)

Publication Number Publication Date
EP0985217A1 true EP0985217A1 (fr) 2000-03-15

Family

ID=19765051

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98924671A Withdrawn EP0985217A1 (fr) 1997-05-29 1998-05-25 Cable de telecommunication hybride

Country Status (3)

Country Link
EP (1) EP0985217A1 (fr)
AU (1) AU7677698A (fr)
WO (1) WO1998054732A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6931183B2 (en) * 1996-03-29 2005-08-16 Dominion Lasercom, Inc. Hybrid electro-optic cable for free space laser antennas
US6463198B1 (en) * 2000-03-30 2002-10-08 Corning Cable Systems Llc Micro composite fiber optic/electrical cables
WO2011060518A1 (fr) * 2009-11-21 2011-05-26 Rfs Brasil Telecomunicações Ltda Fibre amorce hybride pour télécommunications mobiles
JP2013058335A (ja) * 2011-09-07 2013-03-28 Sumitomo Electric Ind Ltd 光電気複合ケーブル
CN103021547B (zh) * 2012-12-28 2016-01-20 江苏亨通光电股份有限公司 光电融合型混合缆

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3226265A1 (de) * 1982-07-14 1984-01-19 Gebrüder Merten GmbH & Co KG, 5270 Gummersbach Elektrische leitung
DE4416545A1 (de) * 1994-05-10 1995-11-16 Siemens Ag Kabel mit elektrischen und optischen Leitern
DE19544898A1 (de) * 1994-12-01 1996-07-11 Bayerische Kabelwerke Ag Niederspannungs-Energiekabel mit LWL-Element

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9854732A1 *

Also Published As

Publication number Publication date
AU7677698A (en) 1998-12-30
WO1998054732A1 (fr) 1998-12-03

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