WO2022264523A1 - 光ファイバケーブル - Google Patents

光ファイバケーブル Download PDF

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Publication number
WO2022264523A1
WO2022264523A1 PCT/JP2022/006832 JP2022006832W WO2022264523A1 WO 2022264523 A1 WO2022264523 A1 WO 2022264523A1 JP 2022006832 W JP2022006832 W JP 2022006832W WO 2022264523 A1 WO2022264523 A1 WO 2022264523A1
Authority
WO
WIPO (PCT)
Prior art keywords
sheath
tension member
optical fiber
fiber cable
peripheral surface
Prior art date
Application number
PCT/JP2022/006832
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
大樹 竹田
健 大里
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
Priority to JP2023529511A priority Critical patent/JPWO2022264523A1/ja
Priority to CN202280011760.5A priority patent/CN116802534A/zh
Publication of WO2022264523A1 publication Critical patent/WO2022264523A1/ja

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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

Definitions

  • Patent Document 1 discloses an optical fiber cable that includes a core having a plurality of optical fibers, a sheath covering the core, and a tear string and tension member embedded in the sheath. A tear string is placed in contact with the core and is used to tear the sheath to remove the core.
  • the tear string is arranged so as to be in contact with the core, so there is a possibility that the tear string may drop radially inward of the sheath due to lateral pressure. If the tear string falls into the sheath, the tear string may wind around the core when tearing the sheath, thereby damaging the optical fiber.
  • an optical fiber cable includes a core having a plurality of optical fibers, a sheath covering the core, and a tension member embedded in the sheath,
  • the sheath exists between the tension member and the core, and in a cross-sectional view, the outer peripheral surface of the tension member has an adhesive area that is attached to the sheath and a non-adhesive area that is not attached to the sheath. and is provided.
  • FIG. 1 is a cross-sectional view of an optical fiber cable according to this embodiment
  • FIG. FIG. 2 is a diagram for explaining an operation of taking out a core from the optical fiber cable of FIG. 1; It is a figure explaining the process following FIG. 2A. It is a figure explaining the process following FIG. 2B.
  • the optical fiber cable 10 includes a core 2, a pair of tension members 3, and a sheath 4.
  • the core 2 has a plurality of optical fiber units 1 and a pressure wrap 2a covering these optical fiber units 1.
  • Each optical fiber unit 1 has a plurality of optical fibers 1a and a binding material 1b for binding the plurality of optical fibers 1a.
  • an optical fiber core wire an optical fiber bare wire, an optical fiber tape core wire, or the like can be used.
  • the plurality of optical fibers 1a may form a so-called intermittently fixed ribbon.
  • the intermittent fixing tape core wire the plurality of optical fibers 1a are adhered to each other so that when pulled in a direction perpendicular to the extending direction, they spread out in a mesh shape (spider web shape). More specifically, one optical fiber 1a is bonded to each of its adjacent optical fibers 1a at different positions in the longitudinal direction, and the adjacent optical fibers 1a are spaced apart by a certain distance in the longitudinal direction. are glued together.
  • the mode of the optical fiber 1a included in the core 2 is not limited to the intermittently fixed tape core wire, and may be changed as appropriate.
  • a nonwoven fabric, a polyester tape, or the like can be used as the press wrap 2a.
  • a water-absorbing tape obtained by imparting water-absorbing properties to a non-woven fabric, polyester tape, or the like may be used.
  • the waterproof performance of the optical fiber cable 10 can be enhanced.
  • the pressure winding 2a may be omitted.
  • a so-called notch is not formed on the outer peripheral surface of the sheath 4 .
  • a notch is a portion that guides the progression of fracture when the sheath 4 is torn or cut open.
  • a general shape of the notch is a V-shaped groove recessed radially inward from the outer peripheral surface of the sheath 4 and extending in the longitudinal direction.
  • the optical fiber cable 10 of this embodiment is configured so that the sheath 4 can be easily torn without a notch. Note that if there is a notch on the outer peripheral surface of the sheath 4, water may enter from the cable gripping portion of the closure or the like.
  • the outer peripheral surface of the tension member 3 includes a non-adhesive area 3a and an adhesive area 3b.
  • the non-bonded region 3 a is a portion of the outer peripheral surface of the tension member 3 that is not bonded to the sheath 4 .
  • the adhesion region 3 b is a portion of the outer peripheral surface of the tension member 3 that is adhered to the sheath 4 .
  • the inclusion 5 is curved along the outer peripheral surface of the tension member 3 .
  • a portion of the outer peripheral surface of the tension member 3 that is covered with the inclusions 5 is the non-bonded area 3a, and a portion that is not covered with the inclusions 5 is the bonded area 3b.
  • Such a structure can be realized by extruding the sheath 4 with the tension member 3 and the interposition 5 vertically attached. More specifically, when the sheath 4 is extruded, the outer peripheral surface of the tension member 3 is adhered to the sheath 4 at the portion where the inclusion 5 does not exist. On the other hand, contact and adhesion between the sheath 4 and the tension member 3 are suppressed in the portion where the inclusion 5 exists.
  • An adhesive may be applied to the entire outer peripheral surface of the tension member 3 in order to increase the adhesive strength between the tension member 3 and the sheath 4 in the adhesive region 3b (region where the inclusion 5 does not exist).
  • a tool K is used to make a cut N1 (see FIG. 2B) from the outer peripheral surface of the sheath 4 toward the tension member 3.
  • the notches N1 are made toward the tension members 3 from two locations separated in the circumferential direction of the outer peripheral surface of the sheath 4 .
  • the operator can grasp the position of the tension member 3 from the bending directionality of the optical fiber cable 10 caused by the two tension members 3, for example.
  • the optical fiber cable 10 is less likely to bend in the direction in which the neutral line L extends, and more likely to bend in the vertical direction Z. As shown in FIG.
  • the outer peripheral surface of the sheath 4 may be provided with a mark (for example, colored or minute projection) indicating the position of the tension member 3 .
  • a mark for example, colored or minute projection
  • the operator can grasp the position of the tension member 3 by the mark.
  • the position of the tension member 3 may be confirmed by checking the end surface of the optical fiber cable 10 in the longitudinal direction.
  • Tool K may be, for example, a cutter. Alternatively, a nipper or the like may be used as the tool K when making the cut N1 at the end of the optical fiber cable 10 in the longitudinal direction.
  • force is applied to the sheath 4 so as to open the incision N1. More specifically, a +Z side force is applied to the first portion 4a of the sheath 4, and a -Z side force is applied to the second portion 4b.
  • the first portion 4a and the second portion 4b of the sheath 4 are likely to be pulled apart in the vertical direction Z in the non-adhesive region 3a of the tension member 3 .
  • the notch N1 is made in the sheath 4, and then force is applied to the sheath 4 so as to open the notch N1.
  • the sheath 4 is naturally split in the order of the incision N1, the non-bonded region 3a, and the tear N2.
  • the first portion 4a and the second portion 4b are connected at both the radially outer side of the tension member 3 and the radially inner side of the tension member 3 . Therefore, the strength of the sheath 4 is ensured, and cracks or the like in the sheath 4 can be suppressed when lateral pressure acts on the optical fiber cable 10 .
  • the optical fiber cable 10 of this embodiment includes a core 2 having a plurality of optical fibers 1a, a sheath 4 covering the core 2, and a tension member 3 embedded in the sheath 4.
  • a sheath 4 exists between the tension member 3 and the core 2, and in a cross-sectional view, the outer peripheral surface of the tension member 3 has an adhesive region 3b that is adhered to the sheath 4 and a non-adhesive region that is not adhered to the sheath 4.
  • a region 3a is provided. According to this configuration, since the sheath 4 can be torn without using a tearing string, damage to the optical fiber due to the tearing string coming into contact with the optical fiber can be suppressed. In addition, both the strength of the sheath 4 and workability when taking out the core 2 from the optical fiber cable 10 can be achieved.
  • the optical fiber cable 10 further includes an inclusion 5 arranged along the outer peripheral surface of the tension member 3, and the portion of the outer peripheral surface of the tension member 3 covered with the inclusion 5 is the non-adhesive region 3a. is.
  • the non-adhesive region 3a can be easily provided by extruding the sheath 4 with the inclusion 5 along with the tension member 3.
  • the position and size of the non-adhesive region 3a can be easily adjusted.
  • the inclusion 5 may be wound around the tension member 3 in a spiral or SZ shape.
  • the optical fiber cable 10 when the optical fiber cable 10 is manufactured, it is possible to make it difficult for a gap to occur between the inclusion 5 and the tension member 3 . Therefore, it is possible to suppress the phenomenon that the non-adhesive region 3a becomes smaller due to the sheath 4 entering between the inclusion 5 and the tension member 3 .
  • the outer peripheral surface of the sheath 4 is circular. Therefore, it is easy to insert the optical fiber cable 10 through a duct or the like by pneumatic feeding. Cable grips in closures used underground may employ a method of waterproofing the optical fiber cable 10 by compressing it from the outside in the radial direction with rubber, urethane, or the like. In this case, since the outer peripheral surface of the sheath 4 is circular, pressure is applied uniformly to the sheath 4, which is effective from the viewpoint of waterproofness.
  • no notches are formed on the outer peripheral surface of the sheath 4 . Therefore, for example, when the optical fiber cable 10 is laid outdoors, water can be prevented from moving along the notch. In particular, when the optical fiber cable 10 is drawn into the closure, it is possible to prevent water from entering the closure along the notch.
  • a preferable range of the ratio of the non-bonded area 3a to the outer peripheral surface of the tension member 3 will be described below using specific examples.
  • the present invention is not limited to the following examples.
  • 12 cores of intermittently fixed tape core wires are used as the plurality of optical fibers 1a.
  • the total number of optical fibers 1a included in the core 2 is 864.
  • the outer diameter of the tension member 3 was 1.5 mm
  • the inner diameter of the sheath 4 was 11.7 mm
  • the outer diameter of the sheath 4 was 18.7 mm. That is, the thickness of the sheath 4 at the portion where the tension member 3 is not embedded is 3.5 mm. In the radial direction, the thickness of the sheath 4 positioned inside the tension member 3 is 1 mm, and the thickness of the sheath 4 positioned outside the tension member 3 is 1 mm.
  • An adhesive was applied to the entire outer peripheral surface of the tension member 3 to increase the adhesive strength with the sheath 4 .
  • a polyester tape was used as the inclusion 5, and this tape was arranged along the outer peripheral surface of the tension member 3.
  • the tape as the inclusion 5 was extended linearly along the longitudinal direction.
  • the data with a ratio of the non-bonded region 3a of 100% indicates a sample in which the tension member 3 is covered with the inclusions 5 over the entire circumference
  • the data with a ratio of the non-bonded region 3a of 0% indicates the inclusion
  • the result of the temperature cycle test is the Telcordia GR20 Temperature cycling test, and if the increase in optical transmission loss during the test is within 0.15dB/km compared to before the test, it is considered good (OK) and is 0.15dB. /km was defined as defective (NG).
  • a cut N1 having a length of 5 cm was made in the longitudinal direction with a nipper, and a force was applied so as to separate the first part 4a and the second part 4b of the sheath 4 in the vertical direction Z by hand.
  • a force was applied so as to separate the first part 4a and the second part 4b of the sheath 4 in the vertical direction Z by hand.
  • the ratio of the non-bonded area 3a to the outer peripheral surface of the tension member 3 is 20 to 80% in cross-sectional view.
  • the tension member 3 can effectively suppress the expansion and contraction of the sheath 4 in the longitudinal direction, and the sheath 4 can easily be split along the non-adhesive region 3a to ensure workability of opening.
  • the inclusion 5 is linearly aligned with the tension member 3.
  • the result shows that the ratio of the non-adhesive region 3a is preferably 20 to 80% as in Table 1 even when the inclusion 5 is wound around the tension member 3 in a spiral or SZ shape. became.
  • the tension member 3 was wound in a spiral or SZ shape, the winding pitch in the longitudinal direction was changed in the range of 100 to 500 mm.
  • fiber optic cable 10 may not include interposer 5 .
  • a combination is selected in which the mutual adhesiveness is negligible, and an adhesive is applied to a part of the outer peripheral surface of the tension member 3, thereby An adhesive area 3a and an adhesive area 3b may be provided.
  • Fiber optic cable 10 may include a tear string embedded in sheath 4 .
  • a tearing method using a tearing string is also possible, thereby making it easier to expose the core 2. can.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Insulated Conductors (AREA)
  • Light Guides In General And Applications Therefor (AREA)
PCT/JP2022/006832 2021-06-16 2022-02-21 光ファイバケーブル WO2022264523A1 (ja)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2023529511A JPWO2022264523A1 (enrdf_load_stackoverflow) 2021-06-16 2022-02-21
CN202280011760.5A CN116802534A (zh) 2021-06-16 2022-02-21 光纤线缆

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2021099851 2021-06-16
JP2021-099851 2021-06-16

Publications (1)

Publication Number Publication Date
WO2022264523A1 true WO2022264523A1 (ja) 2022-12-22

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Application Number Title Priority Date Filing Date
PCT/JP2022/006832 WO2022264523A1 (ja) 2021-06-16 2022-02-21 光ファイバケーブル

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JP (1) JPWO2022264523A1 (enrdf_load_stackoverflow)
CN (1) CN116802534A (enrdf_load_stackoverflow)
WO (1) WO2022264523A1 (enrdf_load_stackoverflow)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56500428A (enrdf_load_stackoverflow) * 1979-01-18 1981-04-02
JPS63259608A (ja) * 1987-03-31 1988-10-26 アメリカン　テレフォン　アンド　テレグラフ　カムパニー 光ファイバケーブル
US5310964A (en) * 1991-07-23 1994-05-10 Bicc Public Limited Company Electric and communication cables
US20150370026A1 (en) * 2014-06-23 2015-12-24 Corning Optical Communications LLC Optical fiber cable
JP2017068051A (ja) * 2015-09-30 2017-04-06 三菱電線工業株式会社 光ファイバケーブルに用いるテンションメンバ構造及びそのテンションメンバを用いた光ファイバケーブル構造
JP2018146787A (ja) * 2017-03-06 2018-09-20 株式会社フジクラ 光ファイバケーブルおよび光ファイバケーブルの製造方法
JP2020204685A (ja) * 2019-06-17 2020-12-24 古河電気工業株式会社 光ファイバケーブル

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56500428A (enrdf_load_stackoverflow) * 1979-01-18 1981-04-02
JPS63259608A (ja) * 1987-03-31 1988-10-26 アメリカン　テレフォン　アンド　テレグラフ　カムパニー 光ファイバケーブル
US5310964A (en) * 1991-07-23 1994-05-10 Bicc Public Limited Company Electric and communication cables
US20150370026A1 (en) * 2014-06-23 2015-12-24 Corning Optical Communications LLC Optical fiber cable
JP2017068051A (ja) * 2015-09-30 2017-04-06 三菱電線工業株式会社 光ファイバケーブルに用いるテンションメンバ構造及びそのテンションメンバを用いた光ファイバケーブル構造
JP2018146787A (ja) * 2017-03-06 2018-09-20 株式会社フジクラ 光ファイバケーブルおよび光ファイバケーブルの製造方法
JP2020204685A (ja) * 2019-06-17 2020-12-24 古河電気工業株式会社 光ファイバケーブル

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CN116802534A (zh) 2023-09-22

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