WO2023120727A1 - 光ケーブル及び光ケーブルの製造方法 - Google Patents

光ケーブル及び光ケーブルの製造方法 Download PDF

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Publication number
WO2023120727A1
WO2023120727A1 PCT/JP2022/047758 JP2022047758W WO2023120727A1 WO 2023120727 A1 WO2023120727 A1 WO 2023120727A1 JP 2022047758 W JP2022047758 W JP 2022047758W WO 2023120727 A1 WO2023120727 A1 WO 2023120727A1
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WO
WIPO (PCT)
Prior art keywords
optical fiber
twisting
optical
cable
optical cable
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.)
Ceased
Application number
PCT/JP2022/047758
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English (en)
French (fr)
Japanese (ja)
Inventor
洋平 鈴木
文昭 佐藤
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.)
Sumitomo Electric Industries Ltd
Original Assignee
Sumitomo Electric Industries Ltd
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 Sumitomo Electric Industries Ltd filed Critical Sumitomo Electric Industries Ltd
Priority to JP2023569587A priority Critical patent/JPWO2023120727A1/ja
Priority to US18/722,699 priority patent/US20250138268A1/en
Priority to EP22911428.5A priority patent/EP4455751A4/en
Publication of WO2023120727A1 publication Critical patent/WO2023120727A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • G02B6/4479—Manufacturing methods of optical cables
    • G02B6/449—Twisting
    • 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
    • G02B6/02—Optical fibres with cladding with or without a coating
    • G02B6/02214—Optical fibres with cladding with or without a coating tailored to obtain the desired dispersion, e.g. dispersion shifted, dispersion flattened
    • G02B6/02285—Characterised by the polarisation mode dispersion [PMD] properties, e.g. for minimising PMD
    • 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
    • G02B6/441—Optical cables built up from sub-bundles
    • 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
    • G02B6/448—Ribbon cables
    • 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
    • G02B6/4486—Protective covering

Definitions

  • the present disclosure relates to an optical cable and an optical cable manufacturing method.
  • Patent Document 1 discloses a unidirectionally twisted slotless optical cable that suppresses PMD (PMD: Polarization Mode Dispersion). Further, Patent Document 2 discloses an SZ-twisted slotless optical cable that suppresses PMD. Patent Literatures 1 and 2 suppress PMD by setting the twist ratio, which is the amount of twist per unit length of the twist of the optical fiber core wire, to a certain value or more.
  • JP 2007-226051 A Japanese Patent Application Laid-Open No. 2002-122762
  • An optical cable according to the present disclosure is a slotless optical cable including a plurality of optical fiber units made up of a plurality of optical fiber core wires and a cable jacket covering the plurality of optical fiber units, wherein the plurality of optical fibers The fiber units are twisted together along the longitudinal direction of the optical cable, and the twist rate of the twisting between the plurality of optical fiber units is at least partially 0.0014 (rad/mm) or more.
  • the method for manufacturing an optical cable according to the present disclosure is for manufacturing a slotless type optical cable including a plurality of optical fiber units composed of a plurality of optical fiber core wires and a cable jacket covering the plurality of optical fiber units.
  • a method comprising: twisting the plurality of optical fiber units together along the longitudinal direction of the optical cable; and covering the plurality of optical fiber units with the cable jacket, wherein the twisting is performed.
  • the torsion of the twisting of the plurality of optical fiber units is at least partially set to 0.0014 (rad/mm) or more.
  • FIG. 1 is a cross-sectional view of the optical cable according to the present embodiment in the direction perpendicular to the axis.
  • FIG. 2 is a partially developed view showing one optical fiber ribbon in the longitudinal direction.
  • FIG. 3 is a schematic diagram for explaining the configuration of an optical fiber unit in which the tape core wires are not twisted.
  • FIG. 4 is a schematic diagram for explaining the structure of an optical fiber unit in which the tape core wires are twisted.
  • An object of the present disclosure is to provide an optical cable and a method for manufacturing an optical cable that can keep PMD low without degrading fusing workability.
  • an optical cable and a method for manufacturing an optical cable that can keep PMD low without degrading fusion workability.
  • a plurality of optical fiber units comprising a plurality of optical fiber core wires;
  • a slotless optical cable comprising a cable jacket covering the plurality of optical fiber units, The plurality of optical fiber units are twisted together along the longitudinal direction of the optical cable;
  • the twist ratio of the twisting of the plurality of optical fiber units is at least partially set to 0.0014 (rad/mm) or more, the PMD of the optical cable can be reduced to 0.1 ps/km without being greatly twisted. It can be suppressed to 1/2 or less. In addition, with this degree of torsion, the workability of fusion splicing is not deteriorated due to an increase in the bending tendency of the plurality of optical fibers.
  • the twist ratio is the maximum amount of twist per unit length of the optical fiber unit. , is the maximum value (maximum angle).
  • the plurality of optical fiber core wires include optical fiber core wires having an outer diameter of 220 ⁇ m or less, and are arranged in parallel in a direction orthogonal to the longitudinal direction, and between the plurality of optical fiber core wires In part or all, a connecting portion in which the adjacent optical fiber core wires are connected and a non-connecting portion in which the adjacent optical fiber core wires are not connected intermittently in the longitudinal direction.
  • the optical cable according to item (1) which constitutes an intermittently connected optical fiber ribbon.
  • a method for manufacturing a slotless optical cable comprising a plurality of optical fiber units composed of a plurality of optical fiber core wires and a cable jacket covering the plurality of optical fiber units, a step of twisting the plurality of optical fiber units together along the longitudinal direction of the optical cable; covering the plurality of optical fiber units with the cable jacket; including A method of manufacturing an optical cable, wherein in the step of twisting, the twisting rate of the twisting of the plurality of optical fiber units is at least partially set to 0.0014 (rad/mm) or more.
  • the twist ratio of the twisting of the plurality of optical fiber units is at least partially set to 0.0014 (rad/mm) or more, thereby reducing the PMD to 0. .1 ps/km 1/2 or less can be manufactured.
  • twisting step includes a step of twisting the plurality of optical fiber units in the twisting direction.
  • FIG. 1 is a cross-sectional view of the optical cable 1 according to this embodiment in the direction perpendicular to the axis.
  • the optical cable 1 includes a plurality of optical fiber units 2, a water absorbing tape 3, a cable jacket 4, a tensile member 5 and a tearing string 6.
  • the optical cable 1 is a so-called slotless optical cable.
  • the optical fiber unit 2 includes a plurality of optical fiber core wires.
  • the outer diameter of the glass fibers included in the plurality of optical fiber core wires is, for example, 125 ⁇ m, and the outer diameter of the optical fiber core wire is, for example, one of 165 ⁇ m, 200 ⁇ m, 220 ⁇ m, and 250 ⁇ m.
  • the water absorbing tape 3 is wound, for example, vertically or horizontally around the entire periphery of the plurality of optical fiber units 2 .
  • the water-absorbing tape 3 is, for example, a base fabric made of polyester or the like which has undergone water-absorbing processing by adhering water-absorbing powder thereto.
  • the cable jacket 4 is provided so as to cover the periphery of the water absorbing tape 3.
  • the cable jacket 4 is made of resin such as polyvinyl chloride (PVC) or polyethylene (PE), and the resin is extruded onto the plurality of optical fiber units 2 around which the water absorbing tape 3 is wound. It is formed by
  • the tensile strength member 5 is provided so as to be embedded inside the cable jacket 4 .
  • the tensile member 5 is made of fiber reinforced plastic (FRP) such as aramid FRP, glass FRP, carbon FRP, or the like.
  • the tension member 5 may be formed of a liquid crystal polymer.
  • the tensile strength member 5 is circular in cross section. Two tensile members 5 are provided inside the cable jacket 4 along the longitudinal direction of the optical cable 1 .
  • the tear string 6 is for tearing the cable jacket 4 and is embedded in the cable jacket 4 along the longitudinal direction of the optical cable 1 .
  • two tearing strings 6 are provided.
  • the two tearing strings 6 are provided substantially in the middle of the two tension members 5 so as to face each other.
  • the tear string 6 is made of, for example, a plastic material (eg, polyester) that is resistant to tension.
  • a plurality of optical fiber core wires included in the optical fiber unit 2 constitute a plurality of optical fiber tape core wires 10 .
  • a plurality of optical fiber ribbons 10 are assembled in a bundled or twisted state. It should be noted that the optical fiber unit 2 may be an assembly of single optical fiber core wires instead of the form of the optical fiber tape core wire.
  • FIG. 2 is a partially developed view showing one optical fiber tape cable core 10 in the longitudinal direction.
  • the optical fiber ribbon 10 has a plurality of optical fiber core wires 11A to 11L arranged in parallel, and has a connecting portion 12 in which the adjacent optical fiber core wires are connected, and the adjacent optical fiber core wires. It is an intermittently connected optical fiber ribbon in which the unconnected portions 13 are intermittently provided in the longitudinal direction.
  • the optical fiber ribbon 10 has 12 optical fibers 11A to 11L arranged in parallel, and optical fibers 11A and 11B, 11C and 11D, 11E and 11F, and 11G. and 11H, 11I and 11J, and 11K and 11L.
  • the connecting portion 12 and the non-connecting portion 13 are intermittently provided between some of the optical fiber core wires (intermittently every two cores), but all the optical fiber core wires
  • the connecting portion 12 and the non-connecting portion 13 may be intermittently provided between them (intermittently for each core).
  • FIG. 3 is a schematic diagram illustrating a configuration in which the optical fiber tape core wires 10 in the optical fiber unit 2 are twisted together without being twisted back.
  • the optical cable 1 includes twelve optical fiber units 2, one of the twelve optical fiber units 2 is enlarged and displayed in FIG. 3 for explanation.
  • One optical fiber unit 2 is composed of three optical fiber tape core wires 10 consisting of 12 cores.
  • one of the three optical fiber tape core wires 10 is displayed in gradation in order to facilitate visual understanding of the twist angle of the optical fiber ribbon core wires 10 described below. .
  • the optical fiber ribbon 10 in the optical fiber unit 2 is twisted in the clockwise direction R along the longitudinal direction of the optical cable. At that time, since the optical fiber ribbon is not twisted back, when the optical fiber unit 2 and the three optical fiber ribbon ribbons 10 shown in the upper part of FIG. and the twist angles of the three optical fiber ribbons 10 match each other. Although not shown in FIG. 3, the optical fiber ribbon 10 in the optical fiber unit 2 is twisted in the counterclockwise direction L with the twisting direction reversed periodically. That is, the optical fiber ribbon 10 in the optical fiber unit 2 is SZ twisted.
  • FIG. 4 is a schematic diagram illustrating a configuration in which the optical fiber tape core wires 10 in the optical fiber unit 2 are twisted together while the optical fiber tape core wires are twisted.
  • FIG. 4 shows an enlarged view of one of the twelve optical fiber units 2 as in FIG. In order to facilitate visual understanding of the twist angle of the optical fiber ribbon 10, one of the three optical fiber ribbons 10 is displayed in gradation.
  • the optical fiber ribbon 10 is twisted in the clockwise direction R along the longitudinal direction of the optical cable 1 while being twisted in the counterclockwise direction S with respect to the twisting direction. is twisted.
  • twisting means that the optical fiber tape cores of the optical fiber unit 2 are twisted in a direction that eliminates the twist of each optical fiber tape core wire 10 that occurs when the optical fiber tape core wires 10 of the optical fiber unit 2 are twisted together. It means twisting the wire 10 .
  • the optical fiber unit 2 and the three optical fiber tape core wires 10 before being twisted together shown in the upper part of FIG. is smaller than the twist angle of the optical fiber unit 2 by the twisted angle.
  • the twist ratio of the twisting of the plurality of optical fiber units 2 is at least partially 0.0014 (rad/mm) or more.
  • the PMD of the optical cable can be suppressed to 0.1 ps/km 1/2 or less.
  • a method for manufacturing the optical cable of this embodiment will be described.
  • a plurality of optical fiber units 2 are twisted together while periodically reversing the twisting direction along the longitudinal direction of the optical cable.
  • the twist rate is at least partially set to 0.0014 (rad/mm) or more.
  • a water absorbing tape 3 is longitudinally or laterally wound around the plurality of twisted optical fiber units 2, and the circumference thereof is further covered with a cable jacket 4.
  • the step of twisting by at least partially setting the twist ratio of the twisting of the plurality of optical fiber units 2 to 0.0014 (rad/mm) or more, the PMD is suppressed to 0.1 ps/km 1/2 or less. optical cables can be manufactured.
  • the twist rate may be 0.0100 (rad/mm) or less.
  • 0.0100 (rad/mm) or less means that the upper limit of the twist rate is 0.0100 (rad/mm), and even a part of the twist rate does not exceed 0.0100 (rad/mm).
  • Table 1 shows PMD evaluation results of the optical cable 1 of the present disclosure.
  • the optical cable samples to be evaluated use an optical fiber core wire with an outer diameter of 200 ⁇ m and an intermittently connected optical fiber tape core wire. to change the torsion rate.
  • tape twisting is the twisting of the optical fiber tape core wire in the optical fiber unit
  • twisting direction is the twisting direction between the optical fiber units
  • torsion is the optical fiber unit. indicates the torsion rate between them.
  • the twist ratio is the twist ratio measured in a portion of the optical cable 1 . Samples 1 to 5 were subjected to SZ twisting of the optical fiber tape core wire in the optical fiber unit and twisting between the optical fiber units.
  • the PMD of the optical cable 1 can be suppressed to 0.1 ps/km 1/2 or less by setting the twisting ratio to 0.0014 (rad/mm) or more in a part of the optical cable 1. However, if the twist ratio is less than 0.0014 (rad/mm) in a portion of the optical cable 1, the PMD cannot be reduced to 0.1 ps/km 1/2 or less. It should be noted that when the twisting rate of twisting was set to be greater than 0.0100 (rad/mm) in a portion of the optical cable 1, the PMD became smaller, but the fusing workability was lowered.
  • Optical cable 2 Optical fiber unit 3: Water absorption tape 4: Cable jacket 5: Tensile strength member 6: Tear string 10: Optical fiber tape core wires 11A to 11L: Optical fiber core wire 12: Connection part 13: Non-connection part R : Clockwise direction L: Counterclockwise direction S: Counterclockwise direction

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Light Guides In General And Applications Therefor (AREA)
  • Communication Cables (AREA)
PCT/JP2022/047758 2021-12-24 2022-12-23 光ケーブル及び光ケーブルの製造方法 Ceased WO2023120727A1 (ja)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP2023569587A JPWO2023120727A1 (https=) 2021-12-24 2022-12-23
US18/722,699 US20250138268A1 (en) 2021-12-24 2022-12-23 Optical cable and method for manufacturing optical cable
EP22911428.5A EP4455751A4 (en) 2021-12-24 2022-12-23 OPTICAL CABLE AND METHOD FOR MANUFACTURING AN OPTICAL CABLE

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JP2021210965 2021-12-24
JP2021-210965 2021-12-24

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EP (1) EP4455751A4 (https=)
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2025163794A1 (ja) * 2024-01-31 2025-08-07 住友電気工業株式会社 光ファイバケーブル
WO2026022974A1 (ja) * 2024-07-24 2026-01-29 住友電気工業株式会社 光ケーブル、および、光ケーブルの製造方法

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002122762A (ja) 2000-08-11 2002-04-26 Furukawa Electric Co Ltd:The 光ファイバケーブル
JP2007108424A (ja) * 2005-10-13 2007-04-26 Sumitomo Electric Ind Ltd 光ケーブル
JP2007226051A (ja) 2006-02-24 2007-09-06 Sumitomo Electric Ind Ltd 光ケーブル
US20110211794A1 (en) * 2008-11-07 2011-09-01 Marco Ruzzier Bend-insensitive optical cable
JP2012027392A (ja) * 2010-07-27 2012-02-09 Sumitomo Electric Ind Ltd 光ファイバテープ心線の製造方法および製造装置
WO2019124077A1 (ja) * 2017-12-19 2019-06-27 株式会社フジクラ 光ファイバケーブル
WO2020189772A1 (ja) * 2019-03-20 2020-09-24 住友電気工業株式会社 間欠連結型光ファイバテープ心線、光ファイバケーブルおよびコネクタ付き光ファイバコード

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10514517B2 (en) * 2015-07-31 2019-12-24 Sumitomo Electric Industries, Ltd. Optical fiber cable
HUE067399T2 (hu) * 2018-10-11 2024-10-28 Fujikura Ltd Optikai kábel
JP7426873B2 (ja) * 2020-03-27 2024-02-02 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
JP2002122762A (ja) 2000-08-11 2002-04-26 Furukawa Electric Co Ltd:The 光ファイバケーブル
JP2007108424A (ja) * 2005-10-13 2007-04-26 Sumitomo Electric Ind Ltd 光ケーブル
JP2007226051A (ja) 2006-02-24 2007-09-06 Sumitomo Electric Ind Ltd 光ケーブル
US20110211794A1 (en) * 2008-11-07 2011-09-01 Marco Ruzzier Bend-insensitive optical cable
JP2012027392A (ja) * 2010-07-27 2012-02-09 Sumitomo Electric Ind Ltd 光ファイバテープ心線の製造方法および製造装置
WO2019124077A1 (ja) * 2017-12-19 2019-06-27 株式会社フジクラ 光ファイバケーブル
WO2020189772A1 (ja) * 2019-03-20 2020-09-24 住友電気工業株式会社 間欠連結型光ファイバテープ心線、光ファイバケーブルおよびコネクタ付き光ファイバコード

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP4455751A4

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2025163794A1 (ja) * 2024-01-31 2025-08-07 住友電気工業株式会社 光ファイバケーブル
WO2026022974A1 (ja) * 2024-07-24 2026-01-29 住友電気工業株式会社 光ケーブル、および、光ケーブルの製造方法

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US20250138268A1 (en) 2025-05-01
EP4455751A1 (en) 2024-10-30
EP4455751A4 (en) 2025-05-07
JPWO2023120727A1 (https=) 2023-06-29

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