WO2013065625A1 - Câble de fibre optique autoporteur et procédé d'accès à mi-portée - Google Patents

Câble de fibre optique autoporteur et procédé d'accès à mi-portée Download PDF

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Publication number
WO2013065625A1
WO2013065625A1 PCT/JP2012/077850 JP2012077850W WO2013065625A1 WO 2013065625 A1 WO2013065625 A1 WO 2013065625A1 JP 2012077850 W JP2012077850 W JP 2012077850W WO 2013065625 A1 WO2013065625 A1 WO 2013065625A1
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WO
WIPO (PCT)
Prior art keywords
cable
optical fiber
sheath
self
slot
Prior art date
Application number
PCT/JP2012/077850
Other languages
English (en)
Japanese (ja)
Inventor
由人 工藤
岡田　直樹
山中　正義
富川　浩二
大樹 竹田
Original Assignee
株式会社フジクラ
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 株式会社フジクラ filed Critical 株式会社フジクラ
Publication of WO2013065625A1 publication Critical patent/WO2013065625A1/fr

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    • 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
    • G02B6/4429—Means specially adapted for strengthening or protecting the cables
    • G02B6/443—Protective covering
    • G02B6/4432—Protective covering with fibre reinforcements
    • G02B6/4433—Double reinforcement laying in straight line with optical transmission element

Definitions

  • the present invention relates to a self-supporting optical fiber cable having a slot core with a C-shaped cross section, and an intermediate post branching method thereof.
  • a self-supporting optical fiber cable described in Patent Document 1 has a slot having a circular cross section in which a plurality of slot grooves are provided on a peripheral surface, and a plurality of optical fiber ribbons are stacked in the slot groove.
  • a cable part in which a core is covered with a sheath is connected to a support line part via a neck part.
  • the neck portion is cut to separate the cable portion from the support wire portion, and the cable portion sheath is cut along the longitudinal direction of the cable with a cutter or the like.
  • the optical fiber core wire is taken out from the exposed slot groove of the slot core and connected to the drop cable.
  • an object of the present invention is to provide a self-supporting optical fiber cable that can easily perform an intermediate post-branching operation and an intermediate post-branching method.
  • a cable portion in which a slot core having a C-shaped cross section having a slot groove in which an optical fiber is accommodated is covered with a sheath, and a support line provided along the longitudinal direction of the cable portion
  • a self-supporting optical fiber cable having a support line portion covered with a cable and a neck portion that integrally connects the cable portion and the support line portion, on a neutral line connecting the center of the cable portion and the center of the support line portion
  • Two strength members are provided in the longitudinal direction of the cable, one strength member is embedded in the slot core corresponding to the bottom of the slot groove, and the other strength member is the cable corresponding to the opening of the slot groove. It is characterized by being embedded in the sheath of the part.
  • the second invention is characterized in that, in the first invention, the opening of the slot groove is provided toward the support line portion or toward the opposite side to the support line portion.
  • the sheath at the time of intermediate rear branching is located on a line passing through the center of the cable part and perpendicularly intersecting the neutral line, and on the sheath surface of the cable part.
  • a feature is that a removal mark is provided.
  • the fourth invention is characterized in that, in the third invention, a tear string for tearing the sheath of the cable portion is embedded in a portion corresponding to the mark for removing the sheath.
  • a cable portion in which a slot core having a C-shaped cross section provided with a slot groove in which an optical fiber is accommodated is covered with a sheath, and a support line provided along the longitudinal direction of the cable portion And a neck part that integrally connects the cable part and the support line part, and the two strength members are placed in the longitudinal direction of the cable on the neutral line connecting the center of the cable part and the center of the support line part.
  • a self-supporting optical fiber cable in which one strength member is embedded in a slot core corresponding to the bottom of the slot groove, and the other strength member is embedded in a sheath of the cable portion corresponding to the opening of the slot groove.
  • the neck portion is cut to separate the cable portion from the support wire portion, and then the separated cable portion is separated. Incision to a position where the scan reaches the slot core, after the cut to remove sheath portion was placed a predetermined length in the cable longitudinal direction, it is characterized by taking out the optical fiber from the slot groove.
  • the self-supporting optical fiber cable of the present invention since there is one slot groove, it is not necessary to search for which slot groove the optical fiber to be taken out is stored in the intermediate post branching operation, and the slot can be easily A specific optical fiber can be taken out from the groove. For this reason, the intermediate post-branching operation can be easily performed.
  • the optical fiber mounting position and the cable bending neutral line position coincide with each other, It is difficult for the optical fiber accommodated in the slot groove to be compressed or pulled, and the optical fiber meanders in the slot groove to avoid affecting cable characteristics such as transmission loss.
  • the two strength members provided in the cable part are embedded in the slot core and the other is embedded in the sheath, it is possible to avoid an increase in the slot core.
  • FIG. 1 is a cross-sectional view of a self-supporting optical fiber cable according to the present embodiment.
  • 2A to 2D are process diagrams showing an intermediate post-branching method of the self-supporting optical fiber cable shown in FIG.
  • FIG. 3 is a cross-sectional view of a self-supporting optical fiber cable showing an example in which a groove is formed as a mark for removing the sheath at the time of intermediate post branching.
  • FIG. 4 is a cross-sectional view of a self-supporting optical fiber cable showing an example in which a protrusion is formed as a mark for removing the sheath at the time of intermediate branching.
  • FIG. 1 is a cross-sectional view of a self-supporting optical fiber cable according to the present embodiment.
  • 2A to 2D are process diagrams showing an intermediate post-branching method of the self-supporting optical fiber cable shown in FIG.
  • FIG. 3 is a cross-sectional view of a self-supporting optical fiber cable showing an
  • FIG. 5 is a cross-sectional view of a self-supporting optical fiber cable showing an example in which a tear string is embedded in a portion corresponding to the mark for removing the sheath.
  • FIG. 6 is a cross-sectional view of a self-supporting optical fiber cable in which the opening of the slot groove is directed to the side opposite to the support line portion.
  • the self-supporting optical fiber cable 1 of this embodiment includes a cable portion 2, a support wire portion (also referred to as a hanging wire portion) 3, and the cable portion 2 and the support wire portion 3. And a neck portion 4 connected to the head.
  • the cable portion 2 includes a slot core 7 having a C-shaped cross section having a slot groove 6 in which an optical fiber 5 is housed, a pressing tape 8 that covers the opening 10 of the slot groove 6, and a sheath 9 that covers the slot core 7.
  • the optical fiber 5 is, for example, a collection of single-core fibers, a single-core optical fiber core (coated with a nylon, polyester elastomer, UV curable resin, etc. for reinforcement on a 250-micron optical fiber strand (tight buffer), 500 micron and 900 micron optical fiber cores), tape cores, and optical fiber strands fixed intermittently.
  • the optical fiber 5 in FIG. 1 is a tape core wire, and a plurality of tape core wires are mounted in the slot groove 6.
  • the slot core 7 is a holding member that accommodates and holds the optical fiber 5 therein, and has a slot groove 6 that is a circular arc having a center point at a position shifted from the center point O 1 of the cable portion 2.
  • the slot groove 6 is provided with the opening 10 facing the support line portion 3.
  • the slot core 7 is formed by extrusion molding, and a cross section perpendicular to the longitudinal direction has a C-shaped cross section.
  • the slot core 7 is not uniform in thickness, and gradually increases in thickness from the portion where the opening 10 is formed to the portion opposite to the opening 10. In other words, the thickness of the slot core 7 is gradually reduced from the portion corresponding to the bottom of the slot groove 6 to the portion where the opening 10 is formed.
  • the slot core 7 has a tension member for preventing the sheath 9 from being thermally contracted due to the influence of heat received at the place where the self-supporting optical fiber cable 1 is laid and the optical fiber cable itself being deformed.
  • one strength member 11 is embedded.
  • the one strength member 11 is formed in the longitudinal direction of the cable when two orthogonal lines passing through the cable center O1 in the cross section perpendicular to the longitudinal direction of the self-supporting optical fiber cable 1 are defined as the X axis and the Y axis. Along the Y axis.
  • the Y axis functions as a neutral line of the self-supporting optical fiber cable 1.
  • the position of the tensile body 11 is embedded in the slot core 7 along the longitudinal direction of the cable in the portion corresponding to the bottom of the slot groove 6 on the Y axis.
  • the strength member 11 is made of a wire such as a steel wire or FRP, and is a cable having a circular cross-sectional shape.
  • the sheath 9 has an uneven thickness sheath structure in which the sheath thickness facing the opening 10 side of the slot groove 6 is thicker than the sheath thickness on the side opposite to the opening 10 side.
  • the sheath thickness of the portion corresponding to the portion where the strength member 11 is provided is the thinnest, and the sheath thickness is gradually increased toward the portion facing the opening 10 of the slot groove 6.
  • the sheath thickness of the opposing part is the largest.
  • the sheath 9 is formed by extrusion molding so that the entire periphery of the slot core 7 containing the optical fiber 5 is covered with polyethylene resin.
  • a pressing tape 8 for preventing the polyethylene resin from entering the slot groove 6 is attached so as to close the opening 10.
  • the surface of the sheath 9 is provided with a sheath removal mark 12 which is a mark that becomes a tearing portion when the intermediate rear branch is made.
  • the sheath removal marks 12 are provided at two positions on the X axis, which is a line that passes through the center O1 of the cable portion 2 and perpendicularly intersects the Y axis that is a neutral line.
  • the sheath removal mark 12 is provided in the longitudinal direction of the cable as a color band having a color different from that of the sheath 9.
  • the other strength member 13 is embedded in the sheath 9.
  • the other strength member 13 is provided in the sheath 9 of the cable portion 2 corresponding to the opening 10 of the slot groove 6.
  • the other strength member 13 is provided on the Y axis, which is a neutral line, like the one strength member 11.
  • the same two tensile strength members 11 and 13 are used.
  • the support line portion 3 has a shape in which a plurality of support lines 14 are arranged so as to surround the periphery of the support line 14 in a circular arc shape with a single support line 14 as a center. Further, the support wire 14 is provided such that its longitudinal direction coincides with the longitudinal direction of the cable portion 2.
  • the support wire 14 are covered with the same sheath 9 as the cable portion 2, thereby forming a circular cross section smaller than the diameter of the cable portion 2.
  • the support wire 14 may have a structure in which a plurality of support wires are twisted, or may be a single steel wire or a wire material such as FRP.
  • the neck portion 4 integrally connects the cable portion 2 and the support wire portion 3 and is provided on the Y axis with respect to the cable portion 2 and the support wire portion 3.
  • the neck portion 4 may be formed continuously from one end to the other end in the entire cable longitudinal direction with respect to the cable portion 2 or may be intermittently connected to the cable portion 2.
  • the length of the support wire portion 3 is made shorter than the length of the cable portion 2 in order to give an extra length to the length of the cable portion 2. May be.
  • the two strength members 11 and 13 and the support line portion 3 are provided on the Y axis that is a neutral line, and therefore the cable bending direction is restricted. Is done.
  • FIG. 2 is a process diagram showing an intermediate post-branching method.
  • the intermediate post-branching operation for tearing the self-supporting optical fiber cable 1 from the middle of the cable to take out the specific optical fiber 5 and pulling the optical fiber 5 into the home corresponds to a part for taking out the optical fiber 5 first. Cut the neck 4 in the area. When the neck portion 4 is cut, the cable portion 2 is separated from the support wire portion 3.
  • the neutral line of the cable part 2 is on the Y axis even when it is cut off from the support line part 3 and coincides with the mounting position of the optical fiber 5. That is, the cable portion 2 is provided with two strength members 11 and 13, and these strength members 11 and 13 are both Y of two intersecting straight lines passing through the center position O1 of the cable portion 2. It is arranged on the axis (neutral line). Therefore, even if the cable part 2 cut off from the support line part 3 is bent, the optical fiber 5 is stretched or compressed, or the optical fiber 5 meanders in the slot groove 6 to cause a cable such as transmission loss. The possibility of affecting the properties is extremely low.
  • one strength member 11 is provided in the slot core 7, and another strength member 13 is provided in the sheath 9. Therefore, the two strength members 11, 13 are connected to the same slot core.
  • the outer diameter of the cable portion 2 can be reduced compared to the structure provided in FIG.
  • the sheath 9 of the separated cable portion 2 is cut with a cutter 15 or the like from both sides to the position where it reaches the slot core 7.
  • the position where the cut is made is the sheath removal mark 12 provided in the cable portion 2, and the cutter 15 is moved along the sheath removal mark 12 in the cable longitudinal direction by a predetermined length.
  • the cutting by the cutter 15 may be performed by cutting along the sheath removal mark 12 provided as a belt-like line, so that the sheath 9 can be cut without misplacement.
  • the cut sheath 9 is opened with a nipper 16 or the like and cut at an intermediate portion.
  • the sheath 9 at a site that has been torn over a predetermined length is removed.
  • a specific optical fiber 5 is taken out from the slot groove 6 and fusion-connected to a drop cable (not shown) for drawing the optical fiber 5 into the house. This operation completes the intermediate post-branch operation.
  • the self-supporting optical fiber cable of the present embodiment since there is one slot groove 6, there is no need to search for which slot groove the optical fiber 5 to be taken out is accommodated during the intermediate post branching operation.
  • the specific optical fiber 5 can be easily taken out from the slot groove 6. For this reason, the intermediate post-branching operation can be easily performed.
  • the self-supporting type optical fiber cable of the present embodiment even if the neck part 4 is cut and the cable part 2 is separated from the support line part 3 in the intermediate post-branching operation, the cable part 2 alone can Since the neutral position of the cable bend coincides with the optical fiber 5 accommodated in the slot groove 6, it is difficult for compression or tension to act, and the optical fiber 5 meanders in the slot groove 6 and transmission loss. Such as affecting the cable characteristics.
  • the opening 10 of the slot groove 6 is provided toward the support line portion 3, it is possible to prevent the optical fiber 5 from inadvertently jumping out of the slot groove 6. can do.
  • the cable portion 2 is located on a line (X axis) passing through the center O1 of the cable portion 2 and perpendicularly intersecting the neutral line (Y axis). Since the sheath removal mark 12 at the time of intermediate post-branching is provided on the surface of the sheath 9, anyone can definitely cut the sheath 9 accurately.
  • the intermediate post-branching method of the self-supporting optical fiber cable of the present embodiment even if the neck portion 4 is cut and the cable portion 2 is separated from the support wire portion 3, the cable portion 2 alone can Since the neutral line position of the cable bend matches, it is possible to prevent the optical fiber 5 from meandering in the slot groove 6.
  • the sheath 9 of the separated cable portion 2 is cut and the sheath 9 is removed, the optical fiber 5 can be taken out from the slot groove 6 without causing transmission loss.
  • the sheath removal mark 12 provided in the cable portion 2 is not a color band but a groove along the longitudinal direction of the cable.
  • these grooves serve as the sheath removal marks 12 at the time of intermediate rear branching.
  • a plurality of protrusions are formed along the longitudinal direction of the cable, and these protrusions are used as the sheath removal marks 12 at the time of intermediate rear branching.
  • a tear string 17 for tearing the sheath 9 of the cable portion 2 is embedded in a portion corresponding to the sheath removal mark 12.
  • the tear string 17 is embedded in the sheath 9 so as to be in contact with or close to the slot core 7 and is disposed along the longitudinal direction of the cable.
  • the neck portion 4 is cut to separate the cable portion 2 from the supporting wire portion 3, and then the sheath 9 at the site of the sheath removal mark 12 is removed.
  • the tear string 17 is taken out with a blade. Then, by pulling the tear string 17, the sheath 9 is torn in the longitudinal direction of the cable, and the sheath 9 having a predetermined length is removed. Since the tear string 17 is on the slot core 7, it can be taken out without damaging the optical fiber 5.
  • the opening 10 of the slot groove 6 is provided facing away from the support line portion 3.
  • the optical fiber 5 sags under its own weight when the sheath 9 of the cable portion 2 is removed and the optical fiber 5 is taken out. Therefore, the operation of taking out the specific optical fiber 5 from the slot groove 6 becomes easy.
  • the present invention can be used for a self-supporting optical fiber cable having a slot core having a C-shaped cross section.

Abstract

La présente invention porte sur un câble de fibre optique autoporteur avec lequel il est possible de réaliser facilement une opération d'accès à mi-portée. Dans un câble de fibre optique autoporteur (12) dans lequel une partie de câble (2), dans laquelle un cœur à fente de section transversale en forme de C (7) est recouvert d'une gaine (9), est reliée à une partie de fil de support (3) par l'intermédiaire d'une partie d'encolure (4), deux corps en tension (11, 13) sont disposés dans la direction longitudinale du câble sur une ligne neutre (axe y) qui joint le centre (O1) de la partie de câble (2) au centre (O2) de la partie de fil de support (3). L'un des corps en tension (11) est intégré dans le cœur à fente (7) correspondant à la partie inférieure d'une dépression de fente (6), et l'autre des corps en tension (13) est intégré dans la gaine (9) de la partie de câble (2) correspondant à une ouverture (10) de la dépression de fente (6).
PCT/JP2012/077850 2011-11-04 2012-10-29 Câble de fibre optique autoporteur et procédé d'accès à mi-portée WO2013065625A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2011-241949 2011-11-04
JP2011241949 2011-11-04

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WO2013065625A1 true WO2013065625A1 (fr) 2013-05-10

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104849824A (zh) * 2015-06-15 2015-08-19 长飞光纤光缆股份有限公司 一种全干式非金属自承骨架式光缆
EP3115816A4 (fr) * 2014-03-06 2017-10-04 Fujikura Ltd. Câble optique

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02119314U (fr) * 1989-03-11 1990-09-26
JP2002064916A (ja) * 2000-08-21 2002-02-28 Nippon Telegraph & Telephone East Corp ケーブル外被除去器
JP2007127887A (ja) * 2005-11-04 2007-05-24 Fujikura Ltd 光ファイバケーブル
JP2008076897A (ja) * 2006-09-22 2008-04-03 Fujikura Ltd 光ファイバケーブル

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02119314U (fr) * 1989-03-11 1990-09-26
JP2002064916A (ja) * 2000-08-21 2002-02-28 Nippon Telegraph & Telephone East Corp ケーブル外被除去器
JP2007127887A (ja) * 2005-11-04 2007-05-24 Fujikura Ltd 光ファイバケーブル
JP2008076897A (ja) * 2006-09-22 2008-04-03 Fujikura Ltd 光ファイバケーブル

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3115816A4 (fr) * 2014-03-06 2017-10-04 Fujikura Ltd. Câble optique
US10061096B2 (en) 2014-03-06 2018-08-28 Fujikura Ltd. Optical cable
CN104849824A (zh) * 2015-06-15 2015-08-19 长飞光纤光缆股份有限公司 一种全干式非金属自承骨架式光缆
WO2016202148A1 (fr) * 2015-06-15 2016-12-22 长飞光纤光缆股份有限公司 Câble optique possédant un squelette autonome non métallique de type complètement sec

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