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WO2024134731A1 - Câble à fibre optique - Google Patents

Câble à fibre optique Download PDF

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Publication number
WO2024134731A1
WO2024134731A1 PCT/JP2022/046701 JP2022046701W WO2024134731A1 WO 2024134731 A1 WO2024134731 A1 WO 2024134731A1 JP 2022046701 W JP2022046701 W JP 2022046701W WO 2024134731 A1 WO2024134731 A1 WO 2024134731A1
Authority
WO
WIPO (PCT)
Prior art keywords
optical fiber
jacket
fiber core
fiber cable
adjacent
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/JP2022/046701
Other languages
English (en)
Japanese (ja)
Inventor
信 櫻井
駿 小林
雅 菊池
崇司 松尾
泰弘 前原
裕介 山田
貞治 宝満
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.)
NTT Inc
Original Assignee
Nippon Telegraph and Telephone Corp
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 Nippon Telegraph and Telephone Corp filed Critical Nippon Telegraph and Telephone Corp
Priority to PCT/JP2022/046701 priority Critical patent/WO2024134731A1/fr
Priority to JP2024565413A priority patent/JPWO2024134731A1/ja
Publication of WO2024134731A1 publication Critical patent/WO2024134731A1/fr
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

Definitions

  • This disclosure relates to optical fiber cables.
  • Patent Document 1 discloses an optical fiber cable in which optical fiber cores are bundled at high density.
  • a tensile strength member is provided in the outer sheath of the optical fiber cable to prevent breakage and suppress increases in transmission loss. Note that, as shown in Patent Document 2, multiple tensile strength members may be used.
  • rip cords do not have the strength to contribute to the mechanical strength of the optical fiber cable. Therefore, the area of the jacket where the rip cord is provided is more vulnerable to external forces than areas where the rip cord is not provided. Furthermore, to ensure mechanical strength, the optical fiber cable must be able to withstand external forces in the radial direction of a portion of the cross section perpendicular to the longitudinal direction of the jacket.
  • the present disclosure has been made in consideration of the above circumstances, and aims to provide an optical fiber cable that allows easy removal of the optical fiber core, does not damage the optical fiber core when the outer sheath is cut to remove the optical fiber core, and is less likely to develop weak points in the sheath that are vulnerable to external forces.
  • the optical fiber cable includes an optical fiber core, an outer sheath that surrounds and houses the optical fiber core on its inner surface, and a number of tensile strength members embedded in the sheath so as to extend along the optical fiber core, the number of tensile strength members being in contact with two adjacent tensile strength members, and the plane facing the optical fiber core with the two adjacent tensile strength members in between being in contact with the inner surface of the sheath.
  • the optical fiber cable may include an optical fiber core, a sheet surrounding the optical fiber core, an outer jacket that surrounds and houses the optical fiber core with its inner surface via the sheet, and a plurality of tensile strength members embedded in the jacket so as to extend along the optical fiber core, and the plurality of tensile strength members may include two adjacent tensile strength members that are in contact with two adjacent tensile strength members and whose planes facing the optical fiber core with the two adjacent tensile strength members interposed therebetween are in a range from the position where they are in contact with the inner surface of the jacket to a position further forward by the thickness of the sheet toward the optical fiber core.
  • the optical fiber cable includes an optical fiber core, an outer sheath that surrounds and houses the optical fiber core with its inner surface, and a number of strength members embedded in the sheath so as to extend along the optical fiber core, and the axis of the multiple strength members that is the smallest in a cross section perpendicular to the longitudinal direction of the sheath is in contact with two adjacent ones of the multiple strength members and is parallel to a plane that faces the optical fiber core with the two adjacent strength members interposed therebetween, and the plane may include two adjacent strength members that are in contact with the inner surface of the sheath.
  • an optical fiber cable that allows easy removal of the optical fiber core, does not damage the optical fiber core when the outer sheath is cut to remove the optical fiber core, and is less likely to develop weak spots in the outer sheath that are vulnerable to external forces.
  • FIG. 1 is a cross-sectional view showing an optical fiber cable according to a first embodiment.
  • 4 is a cross-sectional view of the optical fiber cable of the first embodiment when the outer sheath is being scraped off.
  • FIG. 3 is a cross-sectional view showing the state where the outer sheath of the optical fiber cable is further scraped off from the cross-sectional view of FIG. 2 and two adjacent strength members are removed.
  • 1 is a cutaway overhead view showing a modified example of the optical fiber cable of the first embodiment.
  • a cross-sectional view showing an optical fiber cable of a second embodiment. 11 is a partially enlarged cross-sectional view of an optical fiber cable according to a second embodiment.
  • FIG. A cross-sectional view showing an optical fiber cable of a third embodiment.
  • optical fiber cable of this embodiment in order from the first to fourth embodiments with reference to the drawings.
  • (First embodiment) 1 is a cross-sectional view showing an optical fiber cable 10 according to a first embodiment.
  • the optical fiber cable 10 according to the first embodiment includes an optical fiber 12, an outer jacket 11 that surrounds the optical fiber 12 and houses the optical fiber 12 in a space 14 formed by an inner surface 11a, and a plurality of tensile members 13 embedded in the outer jacket 11 so as to extend along the optical fiber 12.
  • the optical fiber core 12 is composed of one or more optical fiber cores 12.
  • the optical fiber core 12 may be a bundle of optical fiber tapes in which a plurality of optical fiber cores 12 are arranged in a tape shape.
  • an optical fiber tape composed of four optical fiber cores 12 may be used, and six of these optical fiber tapes may be bundled together to form the optical fiber core 12.
  • the outer jacket 11 is a tubular member having a roughly cylindrical shape with a predetermined inner diameter and outer diameter on the inner surface 11a and the outer surface 11b.
  • the outer jacket 11 may be made of a synthetic resin such as a polyolefin, for example, polyethylene (PE).
  • the strength members 13 may be arranged at positions that are approximately rotationally symmetrical with respect to the axis of the jacket 11, which has a roughly cylindrical shape.
  • the strength members 13 may be composed of, for example, four strength members 13.
  • the strength members 13 may extend in the longitudinal direction of the jacket 11 along the optical fiber core 12 and have a roughly cylindrical shape.
  • the strength members 13 may be composed of fiber-reinforced plastic (FRP) made of aramid fiber or glass fiber, or may be composed of steel wire.
  • FRP fiber-reinforced plastic
  • the multiple strength members 13 include two adjacent strength members 13 such that a plane 21 that contacts the two adjacent strength members 13 that face the optical fiber core 12 with the two adjacent strength members 13 in between contacts the inner surface 11a of the jacket 11.
  • the outer surface 11b of the jacket 11 of the optical fiber cable 10 may be processed with protrusions, markings, etc. to indicate the position of such a plane 21.
  • Figure 2 is a cross-sectional view of the optical fiber cable 10 of the first embodiment when the jacket 11 is being scraped off. As shown in Figure 2, the jacket 11 of the optical fiber cable 10 is scraped off from the outer surface 11b with a blade toward a plane 21 that is in contact with two adjacent tensile strength members 13 that face the optical fiber core 12 with the two adjacent tensile strength members 13 in between.
  • the position of such plane 21 may be determined by referring to processing such as protrusions or markings formed on the outer surface 11b of the outer jacket 11. Even when the outer surface 11b of the outer jacket 11 is not processed to indicate the position of the plane 21, it is possible to reach the first tensile strength member 13 by cutting the outer jacket 11, and to reach the second adjacent tensile strength member 13 that is in contact with the common plane 21 by cutting from a different angle.
  • the jacket 11 is further scraped from FIG. 2, it reaches the plane 21 that contacts the two adjacent strength members 13 and the inner surface 11a of the jacket 11. Because the strength members 13 are harder than the jacket 11, when the blade hits the strength members 13, the sensation is conveyed to the worker's hand, and the worker knows that the blade has hit the strength members 13. In addition, by making the strength members 11 and 13 different colors, the worker can visually distinguish the strength members 13 as he scrapes the jacket 11. When the worker knows that the strength members 13 have been reached, he stops scraping the jacket 11, and does not advance the blade to the inner surface 11a of the jacket 11. Therefore, the optical fiber core 12 is not damaged by the blade.
  • FIG. 3 is a cross-sectional view of the optical fiber cable 10 when the jacket 11 is further scraped away from the cross-sectional view of FIG. 2 and two adjacent strength members 13 are removed. Because the flat surface 21 is in contact with the two adjacent strength members 13, the jacket 11 can be scraped away until it reaches the flat surface 21, exposing the two adjacent strength members 13 and removing them. Because the flat surface 21 is also in contact with the inner surface 11a of the jacket 11, when the two adjacent strength members 13 are removed, the jacket 11 is torn open along the longitudinal direction of the jacket 11 through which the optical fiber core 12 extends, forming a crack 16. The optical fiber core 12 housed in the space 14 formed by the inner surface 11a of the jacket 11 can be removed from the jacket 11 through the crack 16.
  • the optical fiber cable 10 of the first embodiment can easily remove the optical fiber core 12 housed in the space 14 formed on the inner surface 11a of the jacket 11 without damaging it by the process described above. Therefore, a rip string used to cut open the optical fiber cable 10 when removing the optical fiber core 12 from the optical fiber cable 10 is not required. Furthermore, since the optical fiber cable 10 of the first embodiment does not have a rip string, the mechanical strength of the jacket 11 is ensured. The optical fiber cable 10 is installed inside and outdoors, and is therefore resistant to external forces and therefore less likely to be damaged, allowing it to be used continuously for a long period of time, improving economic efficiency.
  • FIG. 4 is a cross-sectional view showing a modified example of the optical fiber cable 10 of the first embodiment.
  • the inner surface 11a of the outer jacket 11 is formed so that the thickness of the outer jacket 11 varies along the circumferential direction, which is different from the first embodiment in that the inner surface 11a of the outer jacket 11 has a roughly cylindrical shape.
  • the other configurations of the modified example are the same as those of the optical fiber cable 10 of the first embodiment.
  • the inner surface 11a of the jacket 11 may be formed so that the thickness of the jacket 11 is minimal where the inner surface 11a is close to each of the strength members 13.
  • the inner surface 11a of the jacket 11 may also be formed so that the thickness of the jacket 11 is minimal where the inner surface 11a faces the optical fiber core 12 across two adjacent strength members 13 and where the inner surface 11a is in contact with a plane 21 that is in contact with the two strength members 13 and the inner surface 11a of the jacket 11.
  • the outer jacket 11 can be scraped with a blade from the outer surface 11b toward the plane 21 that contacts the two adjacent tensile strength members 13 and the inner surface 11a of the outer jacket 11, the two adjacent tensile strength members 13 can be removed, the crack 16 formed in the outer jacket 11 can be opened, and the optical fiber core 12 housed in the space 14 formed by the inner surface 11a of the outer jacket can be removed from the outer jacket 11.
  • the inner surface 11a of the outer jacket 11 is formed so that the thickness of the outer jacket 11 varies in the circumferential direction of the inner surface 11a.
  • the thickness may be extremely small at positions where the inner surface 11a is close to the respective tensile members 13 because the strength is ensured by the tensile members 13, and the thickness may be extremely small at the position where the inner surface 11a contacts the flat surface 21 in order to reduce the amount of the outer jacket 11 that needs to be removed to reach the flat surface 21, and thicker portions of the outer jacket 11 may be provided in other portions.
  • the outer jacket 11 has thicker portions, thereby improving the vulnerability of the entire optical fiber cable 10 to external forces. The same applies to the other embodiments described below.
  • Second Embodiment Fig. 5 is a cross-sectional view showing an optical fiber cable 10 according to a second embodiment.
  • the optical fiber cable 10 according to the second embodiment differs from the optical fiber cable 10 according to the first embodiment shown in Fig. 1 in that the optical fiber core 12 is surrounded by a sheet 15, the jacket 11 surrounds the optical fiber core 12 via the sheet 15, and the optical fiber core 12 surrounded by the sheet 15 is housed in a space 14 formed by the inner surface 11a.
  • the sheet 15 may be made of, for example, a nonwoven fabric or a synthetic resin such as polyethylene terephthalate (PET).
  • PET polyethylene terephthalate
  • FIG. 6 is a partially enlarged cross-sectional view of the optical fiber cable 10 of the second embodiment.
  • the multiple strength members 13 include two adjacent strength members 13 that are in contact with each other and have a plane 21 that faces the optical fiber core 12 with the two adjacent strength members 13 interposed therebetween, the plane 21 being in a range from a position in contact with the inner surface 11a of the jacket 11 toward the optical fiber core 12 to a position further forward by the thickness T of the sheet 15.
  • the outer surface 11b of the jacket 11 of the optical fiber cable 10 may be processed with a protrusion, marking, or the like to indicate the position of such a plane 21.
  • the other structure of the optical fiber cable 10 of the second embodiment is the same as that of the first embodiment.
  • the process of extracting the optical fiber 12 from the optical fiber cable 10 of the second embodiment is the same as that of the first embodiment described with reference to Figures 2 and 3.
  • the optical fiber 12 is surrounded by a sheet 15, and the sheet 15 has a thickness T. Therefore, the plane 21 that contacts the two adjacent tensile strength members 13 that face the optical fiber 12 with the two adjacent tensile strength members 13 interposed therebetween may be in a range from the position that contacts the inner surface 11a of the jacket 11 toward the optical fiber 12 to a position that is further forward by the thickness T of the sheet 15, and the precision of the position at which the jacket 11 is cut away by the distance equivalent to the thickness T of the sheet 15 when the jacket 11 is cut away toward the optical fiber 12 is relaxed.
  • the optical fiber cable 10 of the second embodiment can easily remove the optical fiber core 12 housed in the space 14 formed by the inner surface 11a of the jacket 11 without damaging it by the process described above. Therefore, a rip string used to cut open the optical fiber cable 10 when removing the optical fiber core 12 from the optical fiber cable 10 is not required. In addition, since the optical fiber cable 10 of the second embodiment does not have a rip string, the mechanical strength of the jacket 11 is ensured. The optical fiber cable 10 is laid inside a building and outdoors, and is therefore resistant to external forces, so it is less likely to be damaged, and can be used continuously for a long period of time, improving economic efficiency. Furthermore, the optical fiber cable 10 of the second embodiment allows the position where the jacket 11 is cut to be displaced by the distance of the thickness T of the sheet 15, so strictness during manufacturing is relaxed.
  • Third Embodiment Fig. 7 is a cross-sectional view showing an optical fiber cable 10 of the third embodiment.
  • the optical fiber cable 10 of the third embodiment differs from the optical fiber cable 10 of the first embodiment shown in Fig. 1 in that the axis 22 of the plurality of strength members 13, which has the smallest second moment in a cross section perpendicular to the longitudinal direction of the jacket 11, is in contact with two adjacent strength members 13 and is parallel to a plane 21 facing the optical fiber core 12 with the two adjacent strength members 13 interposed therebetween, and the plane 21 includes two adjacent strength members 13 that are in contact with the inner surface 11a of the jacket 11.
  • the other structure of the optical fiber cable 10 of the third embodiment is similar to that of the first embodiment.
  • the process of extracting the optical fiber core 12 from the optical fiber cable 10 of the third embodiment is the same as that of the first embodiment described with reference to Figures 2 and 3.
  • a difference occurs between the bending rigidity in a plane including the axis 22 where the secondary moment is the smallest and the bending rigidity in a plane not including the axis 22.
  • the bending rigidity in a plane including the axis 22 where the secondary moment is the smallest is the smallest.
  • the plane including the axis 22 where the secondary moment is the smallest is a plane including the axis 22 and the longitudinal direction of the jacket 11, and the plane not including the axis 22 is a plane including the longitudinal direction of the jacket 11 but not including the axis 22.
  • a worker extracting the optical fiber core 12 from the optical fiber cable 10 can identify an axis 22 that is in contact with two adjacent strength members 13, faces the optical fiber core 12 through the two adjacent strength members 13, and is parallel to a plane 21 that is in contact with the inner surface 11a of the jacket 11, where the bending stiffness in a cross section perpendicular to the longitudinal direction of the optical fiber cable 10 is minimum. Then, by grinding the jacket 11 toward this axis 22, the plane 21 that is in contact with the two adjacent strength members 13 can be reached.
  • the optical fiber cable 10 of the third embodiment can easily remove the optical fiber core 12 housed in the space 14 formed by the inner surface 11a of the jacket 11 without damaging it by the process as described above. Therefore, a rip string used to cut open the optical fiber cable 10 when removing the optical fiber core 12 from the optical fiber cable 10 is not required. In addition, since the optical fiber cable 10 of the third embodiment does not have a rip string, the mechanical strength of the jacket 11 is ensured.
  • the optical fiber cable 10 is laid inside a building or outdoors, and is therefore resistant to external forces, so it is less likely to be damaged, and can be used continuously for a long period of time, improving economic efficiency.
  • the optical fiber cable 10 of the third embodiment can easily specify a plane 21 that contacts two adjacent tensile members 13, faces the optical fiber core 12 with the two adjacent tensile members 13 interposed therebetween, and contacts the inner surface 11a of the jacket 11 based on the bending rigidity in a cross section perpendicular to the longitudinal direction of the jacket 11.
  • FIG. 8 is a cross-sectional view showing a modified example of the optical fiber cable 10 of the third embodiment.
  • this modified example six strength members 13 are embedded in the jacket 11, which differs from the third embodiment in that four strength members 13 are embedded in positions that are approximately rotationally symmetrical about the axis of the jacket 11, which has a roughly cylindrical shape.
  • the rest of the configuration of the modified example is the same as that of the optical fiber cable 10 of the third embodiment.
  • the tension members 13 have two adjacent tension members 13 such that the axis 22 at which the second moment of the cross section is the smallest in a cross section perpendicular to the longitudinal direction of the jacket 11 is in contact with two adjacent tension members 13 and is parallel to the plane 21 facing the optical fiber core 12 with the two adjacent tension members 13 interposed therebetween, and the plane 21 is in contact with the inner surface 11a of the jacket 11. Therefore, the worker can identify the axis 22 by bending the optical fiber cable 10 in each direction and comparing the bending rigidity, and reach the plane 21 by cutting the jacket 11 toward this axis 22.
  • the six tension members 13 reduce mechanical strength, but the plane 21 in contact with the inner surface 11a of the jacket 11 can be easily identified based on the bending rigidity in a cross section perpendicular to the longitudinal direction of the jacket 11.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Light Guides In General And Applications Therefor (AREA)

Abstract

L'invention concerne un câble à fibre optique 10 comprenant des fils d'âme de fibre optique 12, une gaine 11 qui renferme et contient les fils d'âme de fibre optique 12 avec une surface intérieure 11a, et une pluralité de corps de traction 13 qui sont intégrés dans la gaine 11 de façon à s'étendre le long des fils d'âme de fibre optique 12. La pluralité de corps de traction 13 comprend deux corps de traction adjacents 13 qui sont agencés de telle sorte qu'un plan 21, qui est tangent aux deux corps de traction adjacents 13 et fait face aux fils d'âme de fibre optique 12 avec les deux corps de traction adjacents 13 interposés entre eux, est tangent à la surface intérieure 11a de la gaine 11.
PCT/JP2022/046701 2022-12-19 2022-12-19 Câble à fibre optique Ceased WO2024134731A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/JP2022/046701 WO2024134731A1 (fr) 2022-12-19 2022-12-19 Câble à fibre optique
JP2024565413A JPWO2024134731A1 (fr) 2022-12-19 2022-12-19

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2022/046701 WO2024134731A1 (fr) 2022-12-19 2022-12-19 Câble à fibre optique

Publications (1)

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WO2024134731A1 true WO2024134731A1 (fr) 2024-06-27

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PCT/JP2022/046701 Ceased WO2024134731A1 (fr) 2022-12-19 2022-12-19 Câble à fibre optique

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JP (1) JPWO2024134731A1 (fr)
WO (1) WO2024134731A1 (fr)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0413905U (fr) * 1990-05-24 1992-02-04
JPH0493906A (ja) * 1990-08-06 1992-03-26 Sumitomo Electric Ind Ltd 高密度光ファイバケーブル
JPH09251122A (ja) * 1996-03-15 1997-09-22 Furukawa Electric Co Ltd:The 光ファイバケーブル
JP2011033743A (ja) * 2009-07-31 2011-02-17 Sumitomo Electric Ind Ltd 光ケーブル
US20120134635A1 (en) * 2009-03-16 2012-05-31 Martin Davies Optical cable with improved strippability
JP2012169103A (ja) * 2011-02-14 2012-09-06 Furukawa Electric Co Ltd:The ケーブル
WO2018101041A1 (fr) * 2016-12-01 2018-06-07 株式会社フジクラ Câble optique et procédé de retrait de peau externe

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0413905U (fr) * 1990-05-24 1992-02-04
JPH0493906A (ja) * 1990-08-06 1992-03-26 Sumitomo Electric Ind Ltd 高密度光ファイバケーブル
JPH09251122A (ja) * 1996-03-15 1997-09-22 Furukawa Electric Co Ltd:The 光ファイバケーブル
US20120134635A1 (en) * 2009-03-16 2012-05-31 Martin Davies Optical cable with improved strippability
JP2011033743A (ja) * 2009-07-31 2011-02-17 Sumitomo Electric Ind Ltd 光ケーブル
JP2012169103A (ja) * 2011-02-14 2012-09-06 Furukawa Electric Co Ltd:The ケーブル
WO2018101041A1 (fr) * 2016-12-01 2018-06-07 株式会社フジクラ Câble optique et procédé de retrait de peau externe

Also Published As

Publication number Publication date
JPWO2024134731A1 (fr) 2024-06-27

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