WO2024134730A1 - 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
WO2024134730A1
WO2024134730A1 PCT/JP2022/046699 JP2022046699W WO2024134730A1 WO 2024134730 A1 WO2024134730 A1 WO 2024134730A1 JP 2022046699 W JP2022046699 W JP 2022046699W WO 2024134730 A1 WO2024134730 A1 WO 2024134730A1
Authority
WO
WIPO (PCT)
Prior art keywords
optical fiber
jacket
fiber cable
strength members
fiber core
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/JP2022/046699
Other languages
English (en)
French (fr)
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 JP2024565412A priority Critical patent/JPWO2024134730A1/ja
Priority to PCT/JP2022/046699 priority patent/WO2024134730A1/ja
Publication of WO2024134730A1 publication Critical patent/WO2024134730A1/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

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 with its inner surface, and a number of strength members that are embedded in the sheath so as to extend along the optical fiber core, with their outer surfaces contacting the inner surface of the sheath or with parts of their outer surfaces exposed from the inner surface of the sheath, and the plane that contacts two adjacent ones of the plurality of strength members and faces the optical fiber core with the two strength members interposed therebetween is separated from the inner surface of the sheath.
  • the optical fiber cable includes an optical fiber core, an outer sheath that surrounds and houses the optical fiber core, and a number of strength members that are embedded in the sheath so as to extend along the optical fiber core, with their outer surfaces in contact with the inner surface of the sheath or with parts of their outer surfaces exposed from the inner surface of the sheath, and in a cross section perpendicular to the longitudinal direction of the sheath, the axis that minimizes the second moment of the cross section 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 is separated from 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 sheath that are vulnerable to external forces.
  • FIG. 1 is a cross-sectional view showing an optical fiber cable according to a first embodiment.
  • 1 is a cutaway overhead view showing an optical fiber cable according to a first embodiment.
  • 1 is a cross-sectional view of the optical fiber cable of the first embodiment when the outer sheath is scraped to reach one tension member.
  • FIG. FIG. 4 is a cross-sectional view of FIG. 3 with one tension member removed.
  • FIG. 5 is a cross-sectional view of a split formed by removing one strength member from the cross-sectional view of FIG. 4 .
  • 1 is a cutaway overhead view showing a modified example of the optical fiber cable of the first embodiment.
  • FIG. 11 is a side view showing an optical fiber cable according to a second embodiment; 11 is a cross-sectional view of the optical fiber cable of the second embodiment when the outer sheath is scraped to reach two adjacent strength members.
  • FIG. FIG. 10 is a cross-sectional view of the cross-section of FIG. 9 when two adjacent strength members are removed.
  • FIG. 11 is a cross-sectional view showing a crack formed in the cross-sectional view of FIG. 10 .
  • FIG. 11 is a side view showing an optical fiber cable according to a third embodiment; A cross-sectional view showing an optical fiber cable of a fourth embodiment.
  • optical fiber cable of this embodiment in order from the first to fourth embodiments with reference to the drawings.
  • Fig. 1 is a cross-sectional view showing an optical fiber cable 10 according to a first embodiment.
  • Fig. 2 is a broken overhead view showing the optical fiber cable 10 according to the first embodiment.
  • the optical fiber cable 10 according to the first embodiment includes an optical fiber core 12, an outer jacket 11 that surrounds the optical fiber core 12 and accommodates the optical fiber core 12 in a space 14 formed by an inner surface 11a, and a plurality of tensile members 13 that are embedded in the outer jacket 11 so as to extend along the optical fiber core 12 and whose outer surfaces 13a are in contact with the inner surface 11a of the outer jacket 11.
  • 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 strength members 13 are embedded in the jacket 11 so as to extend along the optical fiber core 12, and the outer surface 13a of the strength members 13 is in contact with the inner surface 11a of the jacket 11.
  • the plane 21 that is in contact with the two strength members 13 that face the optical fiber core 12 with the two adjacent strength members 13 interposed therebetween is separated from the inner surface 11a of the jacket 11 and does not intersect with the inner surface 11a.
  • Figure 3 is a cross-sectional view of the optical fiber cable 10 of the first embodiment when the sheath 11 is scraped to reach one of the tension members.
  • the sheath 11 of the optical fiber cable 10 is scraped from the outer surface 11b with a blade, and one of the tension members 13 is exposed from the scraped portion. Since the tension member 13 is harder than the sheath 11, when the blade hits the tension member 13, the sensation is conveyed to the worker's hand, and the worker knows that the blade has hit the tension member 13.
  • the worker can scrape the sheath 11 and visually distinguish when the tension member 13 is exposed.
  • the worker finishes the work of scraping the sheath 11, and does not advance the blade to the inner surface 11a of the sheath 11. This prevents the optical fiber core 12 from being damaged by the blade.
  • FIG. 4 is a cross-sectional view showing the state after removing one exposed tensile strength member 13 from the cross-sectional view of FIG. 5.
  • the exposed tensile strength member can be removed by peeling it off from the jacket 11. Because the outer surface 13a of the tensile strength member 13 is in contact with the inner surface 11a of the jacket 11, removing the exposed tensile strength member 13 causes the jacket 11 to split along the longitudinal direction of the jacket 11 through which the optical fiber core 12 extends.
  • FIG. 5 is a cross-sectional view showing the state in which a crack 16 formed by removing one of the tensile members in the cross-sectional view of FIG. 4 has been opened. By opening the crack 16, it becomes possible to remove the optical fiber core 12 housed in the space 14 formed by the inner surface 11a of the jacket 11 from the jacket 11.
  • 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.
  • Figure 6 is a broken overhead view showing a modified example of the optical fiber cable 10 of the first embodiment.
  • the tensile member 13 is embedded in the outer jacket 11 so as to extend in the longitudinal direction of the outer jacket 11 along the optical fiber core 12, and a part of its outer surface 13a is exposed from the inner surface 11a of the outer jacket 11.
  • the rest of the structure of the modified example is similar to that of the optical fiber cable 10 of the first embodiment.
  • the plane 21 in contact with the two adjacent strength members 13 that face the optical fiber core 12 with the two adjacent strength members 13 interposed therebetween is separated from the inner surface 11a of the jacket 11 and does not intersect with the inner surface 11a.
  • the steps shown in FIG. 3 to FIG. 5 are used to cut the outer surface 11b of the jacket 11 with a blade to expose one strength member 13, and the one strength member 13 is removed to open the crack 16 in the jacket 11, allowing the optical fiber core 12 housed in the space 14 formed by the inner surface 11a of the jacket 11 to be taken out from the jacket 11.
  • a part of the outer surface 13a of the strength member 13 is exposed from the inner surface 11a of the jacket 11, making it easier to remove the exposed strength member 13 from the jacket 11 and easier to form a crack 16 in the jacket 11.
  • Second Embodiment 7 is a cross-sectional view showing the optical fiber cable 10 according to the second embodiment.
  • the optical fiber cable 10 according to the second embodiment has a similar structure to the optical fiber cable 10 according to the first embodiment shown in FIGS.
  • a plane 22 is shown that passes through the axis of the jacket 11, which has a roughly cylindrical shape.
  • This plane 22 is arbitrarily set so as to pass through the axis of the jacket 11.
  • a plane 21 that faces the optical fiber core 12 across two adjacent tensile members 13, and that faces the plane 22 in the space 14 formed by at least the inner surface 11a of the jacket 11. This plane 21 is separated from the inner surface 11a of the jacket 11, and does not intersect with the inner surface 11a.
  • Figure 8 is a side view showing the optical fiber cable 10 of the second embodiment.
  • This side view shows the optical fiber cable 10 observed from a direction perpendicular to the plane 22 shown in the cross-sectional view of Figure 7.
  • each divided optical fiber cable 10 contains two or more strength members 13. Therefore, when the side of the optical fiber cable 10 is viewed from above as in Figure 8, there are always two or more adjacent strength members 13 along the side viewed from above.
  • the process of extracting the optical fiber core 12 from the optical fiber cable 10 of the second embodiment will be described.
  • the outer sheath 11 of the optical fiber cable 10 is scraped from the outer surface 11b with a blade, and two adjacent tensile members 13 are exposed from the scraped portion. Since the tensile members 13 are harder than the sheath 11, when the blade hits the tensile members 13, the sensation is conveyed to the worker's hand, and the worker knows that the blade has hit the tensile members.
  • the sheath 11 and the tensile members 13 have different colors, the worker can visually distinguish the exposed tensile members 13 as he scrapes the sheath 11. When the worker knows that the two adjacent tensile members 13 have been reached, he finishes the work of scraping the sheath 11, and does not advance the blade to the inside of the optical fiber cable 10. Therefore, the optical fiber core 12 is not damaged by the blade.
  • FIG. 10 is a cross-sectional view showing the state after removing the two exposed adjacent strength members 13 in the cross-sectional view of FIG. 9.
  • the two exposed adjacent strength members 13 can be removed by peeling them off from the jacket 11. Because the outer surface 13a of the strength members 13 contacts the inner surface 11a of the jacket 11, removing the two exposed strength members 13 causes the jacket 11 to split along the longitudinal direction of the jacket 11 through which the optical fiber core 12 extends.
  • FIG. 11 is a cross-sectional view showing a crack 16 formed by removing two adjacent strength members in the cross-section of FIG. 10. By removing the two exposed strength members 13, the jacket 11 is split open along the longitudinal direction, eliminating the need to open the cut jacket 11 and allowing the optical fiber core 12 to be extracted even in a more limited working area.
  • 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. Furthermore, 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 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 cost-effectiveness.
  • the strength members 13 are embedded in the jacket 11 so that their outer surfaces 13a contact the inner surface 11a of the jacket 11.
  • part of the outer surface 13a of the strength members 13 may be exposed from the inner surface 11a of the jacket 11.
  • part of the outer surface 13a of the strength members 13 is exposed from the inner surface 11a of the jacket 11, it becomes easier to remove the two exposed adjacent strength members 13 from the jacket 11, and it also becomes easier to form a crack 16 in the jacket 11.
  • Third Embodiment Fig. 12 is a cross-sectional view showing an optical fiber cable 10 according to a third embodiment.
  • the optical fiber cable 10 according to the third embodiment differs from the optical fiber cable 10 according to the first embodiment shown in Fig. 1 in that a connecting member 15 is provided between two adjacent strength members 13 embedded in the jacket 11.
  • Other structures of the optical fiber cable 10 according to the third embodiment are similar to those of the first embodiment.
  • the connecting members 15, like the strength members 13, may be made of fiber-reinforced plastic (FRP) such as aramid fiber or glass fiber, or may be made of steel wire.
  • FRP fiber-reinforced plastic
  • the connecting members 15 only need to be embedded in the outer sheath 11 and do not need to be exposed from the inner surface 11a of the outer sheath 11.
  • the connecting members 15 only need to have the function of connecting adjacent strength members 13, and as described below, the intervals at which the connecting members 15 are provided along the longitudinal direction of the outer sheath 11 only need to be shorter than the length at which the outer sheath 11 is torn.
  • an even number of tensile bodies 13 may be arranged so that two adjacent tensile bodies 13 are alternately arranged in the circumferential direction of the inner surface 11a of the outer jacket 11 between a configuration in which a connecting member 15 is provided between the two tensile bodies 13 and a configuration in which no connecting member 15 is provided between the two tensile bodies 13.
  • four tensile bodies 13 are alternately arranged in the circumferential direction of the inner surface 11a of the outer jacket 11 between a configuration in which a connecting member 15 is provided between the two tensile bodies 13 and a configuration in which no connecting member 15 is provided between the two tensile bodies 13.
  • the strength members 13 are embedded in the jacket 11 so as to extend along the optical fiber core 12, but the outer surface 13a is in contact with the inner surface 11a of the jacket 11.
  • the plane 21 that is in contact with the two strength members 13 that face the optical fiber core 12 with the two adjacent strength members 13 interposed therebetween is separated from the inner surface 11a of the jacket 11 and does not intersect with the inner surface 11a.
  • FIG. 13 is a side view showing an optical fiber cable 10 of the third embodiment.
  • each divided optical fiber cable 10 contains two or more strength members 13. Therefore, when the side of the optical fiber cable 10 is viewed from above as in FIG. 13, there are always two or more adjacent strength members 13 along the side viewed from above.
  • the side shown in FIG. 13 contains two adjacent strength members 13 with a connecting member 15 provided between them.
  • the process of removing 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 3 to 5. However, it differs in that after the sheath is scraped to expose one tensile strength member 13 as shown in Figure 3, when this one tensile strength member 13 is peeled off and removed from the sheath 11 as shown in Figure 4, the adjacent one tensile strength member 13 connected by the connecting member 15 is also peeled off. This is ensured by setting the intervals between the connecting members 15 in the longitudinal direction of the sheath 11 to be shorter than the length required to tear the sheath 11.
  • 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 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. Furthermore, the optical fiber cable 10 of the third embodiment is provided with connecting members 15 between adjacent tensile members 13, which further improves the mechanical strength of the jacket 11. The optical fiber cable 10 is installed inside and outside a building, and is therefore resistant to external forces, making it less likely to be damaged, and can be used continuously for a long period of time, improving economic efficiency.
  • FIG. 14 is a cross-sectional view showing an optical fiber cable 10 according to a fourth embodiment.
  • the optical fiber cable 10 according to the fourth embodiment differs from the optical fiber cable 10 according to the first embodiment shown in Fig. 1 in that the second moment about the axis 23 is minimized in a cross section perpendicular to the longitudinal direction of the jacket 11.
  • Other structures of the optical fiber cable 10 according to the fourth embodiment are similar to those of the first embodiment.
  • FIG. 14 a wall surface or road surface 101 that supports the optical fiber cable 10 is shown.
  • a difference occurs between the bending rigidity with respect to the plane 21 that includes the axis 23 and the bending rigidity with respect to a plane that does not include the axis 23.
  • the plane that includes the axis 23 for which the second moment is smallest is a plane that includes the axis 23 and the longitudinal direction of the jacket 11, and the plane that does not include the axis 23 is a plane that includes the longitudinal direction of the jacket 11 but does not include the axis 23.
  • the optical fiber cable 10 can be stored by being wound up in a loop in the direction in which the bending stiffness is minimized, in which case the optical fiber cable 10 is laid so that it is unwound from the loop. Therefore, when the optical fiber cable 10 is laid on a wall or road surface 101, the wall or road surface 101 and the plane 21 including the axis 23 of the optical fiber cable 10 are positioned parallel to each other. As a result, the road or wall surface 101, the axis 23, and the planes 21 that are in contact with the two adjacent tensile strength members 13 that face the optical fiber core 12 with the two tensile strength members 13 in between, and that are parallel to the axis 23, are all parallel to each other.
  • the worker can scrape the jacket 11 toward the plane 21 parallel to the road surface or wall surface 101, and an open space facing the road surface or wall surface 101 across the optical fiber cable 10 is always secured, reducing the burden of the work.
  • the direction in which the jacket 11 is scraped toward the plane 21 is not limited because the plane 21 is not parallel to the road surface or wall surface 101.
  • the process of extracting the optical fiber core 12 from the optical fiber cable 10 of the fourth embodiment is the same as that of the second embodiment described with reference to Figures 9 to 11.
  • the plane 21 that contacts the two adjacent strength members 13 that face the optical fiber core 12 and is parallel to the axis 23 is parallel to the wall surface or road surface 101.
  • the plane 21 that contacts the two adjacent strength members 13 faces the wall surface or road surface 101 with the optical fiber core 12 housed in the jacket 11 in between.
  • a worker who is removing the optical fiber core 12 from the optical fiber cable 10 can easily proceed with the work of removing the optical fiber core 12 by scraping the tensile strength members 13 toward this plane 21 with a blade to expose two adjacent tensile strength members 13, and then removing the two exposed adjacent tensile strength members 13 to form an open crack 16 in the outer jacket 11.
  • the optical fiber cable 10 of the fourth 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. Furthermore, in the optical fiber cable 10 of the fourth embodiment, the plane 21 in contact with two adjacent tensile members 13 is located opposite the wall surface or road surface 101 across the optical fiber core 12 housed in the jacket 11. Therefore, the jacket 11 can be easily cut open without needing a rip-open string used to cut open the optical fiber cable 10 when removing the optical fiber core 12 from the optical fiber cable 10. Furthermore, since the optical fiber cable 10 of the fourth embodiment does not have a rip-open string, the mechanical strength of the jacket 11 is ensured. The optical fiber cable 10 is installed inside a building or outdoors, and is therefore resistant to external forces and therefore is less likely to be damaged, and can be used continuously for a long period of time, improving economic efficiency.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Light Guides In General And Applications Therefor (AREA)
PCT/JP2022/046699 2022-12-19 2022-12-19 光ファイバケーブル Ceased WO2024134730A1 (ja)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2024565412A JPWO2024134730A1 (https=) 2022-12-19 2022-12-19
PCT/JP2022/046699 WO2024134730A1 (ja) 2022-12-19 2022-12-19 光ファイバケーブル

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2022/046699 WO2024134730A1 (ja) 2022-12-19 2022-12-19 光ファイバケーブル

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6147912A (ja) * 1984-08-14 1986-03-08 Kokusai Denshin Denwa Co Ltd <Kdd> 光海底ケ−ブル用フアイバユニツト
JPH0413905U (https=) * 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
US20100150505A1 (en) * 2008-12-12 2010-06-17 Draka Comteq, B.V. Buffered Optical Fiber
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

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5735399B2 (ja) * 2011-11-07 2015-06-17 株式会社フジクラ 光ファイバケーブル及びその製造方法
JP2013109172A (ja) * 2011-11-22 2013-06-06 Sumitomo Electric Ind Ltd 光ファイバユニット及び光ケーブル

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6147912A (ja) * 1984-08-14 1986-03-08 Kokusai Denshin Denwa Co Ltd <Kdd> 光海底ケ−ブル用フアイバユニツト
JPH0413905U (https=) * 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
US20100150505A1 (en) * 2008-12-12 2010-06-17 Draka Comteq, B.V. Buffered Optical Fiber
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

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