WO2022153970A1 - 光ファイバケーブル及びコネクタ付きケーブル - Google Patents
光ファイバケーブル及びコネクタ付きケーブル Download PDFInfo
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- WO2022153970A1 WO2022153970A1 PCT/JP2022/000533 JP2022000533W WO2022153970A1 WO 2022153970 A1 WO2022153970 A1 WO 2022153970A1 JP 2022000533 W JP2022000533 W JP 2022000533W WO 2022153970 A1 WO2022153970 A1 WO 2022153970A1
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- Prior art keywords
- optical fiber
- tensile strength
- cable
- fiber cable
- core wires
- Prior art date
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 209
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 claims description 25
- 239000003063 flame retardant Substances 0.000 claims description 25
- 239000011151 fibre-reinforced plastic Substances 0.000 claims description 17
- 239000000314 lubricant Substances 0.000 claims description 16
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 15
- 229910052760 oxygen Inorganic materials 0.000 claims description 15
- 239000001301 oxygen Substances 0.000 claims description 15
- 239000000126 substance Substances 0.000 claims description 13
- 229920006231 aramid fiber Polymers 0.000 claims description 11
- 239000000835 fiber Substances 0.000 claims description 8
- 239000010410 layer Substances 0.000 description 21
- 230000005540 biological transmission Effects 0.000 description 13
- 229920005989 resin Polymers 0.000 description 12
- 239000011347 resin Substances 0.000 description 12
- 238000005086 pumping Methods 0.000 description 11
- 239000000463 material Substances 0.000 description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 229920002430 Fibre-reinforced plastic Polymers 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 238000012986 modification Methods 0.000 description 6
- 230000004048 modification Effects 0.000 description 6
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 4
- 238000011156 evaluation Methods 0.000 description 4
- 230000002093 peripheral effect Effects 0.000 description 4
- 229920003023 plastic Polymers 0.000 description 4
- 239000004033 plastic Substances 0.000 description 4
- 229910052710 silicon Inorganic materials 0.000 description 4
- 239000010703 silicon Substances 0.000 description 4
- 239000004698 Polyethylene Substances 0.000 description 3
- 230000004308 accommodation Effects 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 239000011152 fibreglass Substances 0.000 description 3
- 229920000573 polyethylene Polymers 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 229920000106 Liquid crystal polymer Polymers 0.000 description 2
- 239000004977 Liquid-crystal polymers (LCPs) Substances 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 239000004918 carbon fiber reinforced polymer Substances 0.000 description 2
- KPUWHANPEXNPJT-UHFFFAOYSA-N disiloxane Chemical class [SiH3]O[SiH3] KPUWHANPEXNPJT-UHFFFAOYSA-N 0.000 description 2
- 230000001939 inductive effect Effects 0.000 description 2
- 229920000728 polyester Polymers 0.000 description 2
- -1 polyethylene Polymers 0.000 description 2
- 239000004800 polyvinyl chloride Substances 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 description 1
- 229910001862 magnesium hydroxide Inorganic materials 0.000 description 1
- 239000000347 magnesium hydroxide Substances 0.000 description 1
- 229920005672 polyolefin resin Polymers 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
Images
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
- G02B6/4401—Optical cables
- G02B6/4429—Means specially adapted for strengthening or protecting the cables
- G02B6/4434—Central member to take up tensile loads
-
- 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
- G02B6/02042—Multicore optical fibres
-
- 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
- G02B6/24—Coupling light guides
- G02B6/36—Mechanical coupling means
- G02B6/38—Mechanical coupling means having fibre to fibre mating means
- G02B6/3807—Dismountable connectors, i.e. comprising plugs
- G02B6/3873—Connectors using guide surfaces for aligning ferrule ends, e.g. tubes, sleeves, V-grooves, rods, pins, balls
- G02B6/3885—Multicore or multichannel optical connectors, i.e. one single ferrule containing more than one fibre, e.g. ribbon type
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
- G02B6/4401—Optical cables
- G02B6/4429—Means specially adapted for strengthening or protecting the cables
- G02B6/443—Protective covering
- G02B6/4432—Protective covering with fibre reinforcements
-
- 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
Definitions
- the present disclosure relates to optical fiber cables and cables with connectors.
- This application claims the priority based on Japanese Application No. 2021-002862 filed on January 12, 2021 and incorporates all the contents described in the Japanese application.
- the optical fiber cable of the present disclosure is Central tensile strength body and A plurality of optical fiber core wires arranged around the central tensile strength body, and A set of tensile strength bodies arranged outside the plurality of optical fiber core wires, With an outer cover arranged on the outside of the plurality of optical fiber core wires,
- the jacket contains at least four sets of tensile strength bodies separated from each other.
- the cable with connector of the present disclosure is With the optical fiber cable A multi-core connector attached to the plurality of optical fiber core wires at one end of the optical fiber cable is provided.
- FIG. 1 is a cross-sectional view of the optical fiber cable according to the first embodiment.
- FIG. 2 is a partially developed view showing the optical fiber tape core wire accommodated in the optical fiber cable in the longitudinal direction.
- FIG. 3 is a cross-sectional view of the optical fiber cable according to the modified example of the first embodiment.
- FIG. 4 is a schematic perspective view of a cable with a connector in which an optical fiber cable is terminated.
- the loose tube type cable has a tension member in the center. Therefore, there is no anisotropy in the bending direction, and wiring by pneumatic feeding is easy.
- the film of the resin tube that covers the optical fiber unit is formed thick. Therefore, it is difficult to reduce the outer diameter of the loose tube type cable and to mount the optical fiber core wire at a high density.
- the slotless cable does not have a resin tube, it is possible to mount optical fiber core wires at high density.
- the slotless cable since a plurality of tension members are embedded in the outer cover, the rigidity of the cable becomes non-uniform depending on the position where the tension members are embedded. As a result, anisotropy in the bending direction occurs, and buckling may occur during pneumatic feeding.
- the cable when the cable is laid in the duct by pneumatic feeding, it is preferable that the cable is generally small in diameter and lightweight and the thickness of the cable jacket is thin in order to extend the pumping distance.
- the cable when the cable is laid in the duct by traction, the cable may be stretched by the traction force.
- the pneumatic cable When the pneumatic cable is laid in the duct by traction, the pneumatic cable may be stretched, which may adversely affect the transmission loss of the optical fiber core wire.
- the present disclosure provides an optical fiber cable and a cable with a connector that can be easily wired by pneumatic feeding and traction.
- the optical fiber cable according to one aspect of the present disclosure is Central tensile strength body and A plurality of optical fiber core wires arranged around the central tensile strength body, and A set of tensile strength bodies arranged outside the plurality of optical fiber core wires, With an outer cover arranged on the outside of the plurality of optical fiber core wires, The jacket contains at least four sets of tensile strength bodies separated from each other.
- the optical fiber cable of the present disclosure at least four tensile strength set are contained in the outer cover separately from each other, so that the rigidity of the cable is not uniform depending on the position where the tensile strength set is included. Is improved, and the cable is less likely to buckle during pneumatic feeding. Further, since the optical fiber cable of the present disclosure includes not only the tensile strength body set included in the outer cover but also the central tensile strength body, the cable is difficult to stretch when towed. Therefore, wiring by pneumatic feeding and traction becomes easy.
- At least one of the central tensile strength body and the tensile strength body set may contain an aramid fiber reinforced plastic.
- the optical fiber cable is provided with a lightweight and highly flexible tensile strength body, and wiring by pneumatic feeding and traction is easy. Become.
- the central tensile strength body contains an aramid fiber reinforced plastic and may have a diameter of 3 mm or less. According to the present disclosure, since the central tensile strength body contains the aramid fiber reinforced plastic, the optical fiber cable is provided with the tensile strength body which is lightweight and has excellent flexibility. Further, when the central tensile strength body is too thick, a plurality of optical fiber core wires in the cable are likely to be mounted without a gap so as to apply lateral pressure to each other. As a result, cable transmission loss may increase. However, since the diameter of the central tensile strength body of the present disclosure is 3 mm or less, it is possible to suppress the elongation of the cable during towing while suppressing the cable transmission loss.
- the jacket may contain 1.5% by mass or more of lubricant. Since the jacket of the present disclosure contains 1.5% by mass or more of lubricant, wiring by pneumatic feeding becomes easy.
- the jacket may contain a flame-retardant inorganic substance having an oxygen index of 50 or more. Since the jacket of the present disclosure contains a flame-retardant inorganic substance having an oxygen index of 50 or more, the flame-retardant property of the optical fiber cable is further improved.
- the jacket includes an outer layer and an inner layer.
- the inner layer may contain a flame-retardant inorganic substance.
- the outer layer may contain a lubricant. According to the present disclosure, since the inner layer of the outer cover contains a flame-retardant inorganic substance, the flame-retardant property of the optical fiber cable can be improved. Further, since the outer layer of the outer cover contains a lubricant, wiring by pneumatic feeding becomes easy.
- the plurality of optical fiber core wires are arranged in parallel in a direction orthogonal to the longitudinal direction, and some or all of the plurality of optical fiber core wires are adjacent to each other.
- Intermittent connection type optical fiber tape core wire in which a connecting portion in a connected state and a non-connecting portion in a state in which adjacent optical fiber core wires are not connected are intermittently provided in the longitudinal direction. It may be in the form of. Since the optical fiber cable of the present disclosure can also use an intermittently connected optical fiber tape core wire, it is excellent in cable accommodation and easy to perform single core separation.
- Each of the plurality of optical fiber core wires may be a multi-core fiber. Since the plurality of optical fiber core wires of the present disclosure are multi-core fibers, the transmission capacity of the optical fiber cable can be increased.
- the cable with a connector is With the optical fiber cable A multi-core connector attached to the plurality of optical fiber core wires at one end of the optical fiber cable may be provided. Such a configuration facilitates cable connection.
- FIG. 1 is a cross-sectional view perpendicular to the longitudinal direction of the optical fiber cable 1A.
- the optical fiber cable 1A includes a central tensile strength body 5A, a plurality of optical fiber core wires in the form of a plurality of optical fiber tape core wires 2, a water absorbing tape 3, a jacket 4, and the like. It includes a plurality of tensile strength bodies 5B (tensile body set 50), at least one tear string 6 (fibrous inclusions), and a plurality of protrusions 7.
- the cable outer diameter of the optical fiber cable 1A is, for example, 10 mm.
- the central tensile strength body 5A is arranged along the longitudinal direction of the optical fiber cable 1A.
- the cross section of the central tensile strength body 5A is formed in a circular shape in a direction orthogonal to the longitudinal direction.
- the diameter of the central tensile strength body 5A is 3 mm or less, for example 2.5 mm.
- the central tensile strength body 5A contains an aramid fiber reinforced plastic.
- the central tensile strength body 5A may be made of a fiber reinforced plastic (FRP) such as a glass fiber reinforced plastic or a carbon fiber reinforced plastic, or a liquid crystal polymer.
- the central tensile strength body 5A is preferably non-inducible.
- the plurality of optical fiber tape core wires 2 are a plurality of optical fiber core wires arranged around the central tensile strength body 5A and in the form of the plurality of optical fiber tape core wires 2.
- Each optical fiber tape core wire 2 includes a plurality of optical fiber core wires.
- FIG. 2 shows a partially developed view showing an example of the optical fiber tape core wire 2 accommodated in the optical fiber cable 1A in the longitudinal direction.
- the optical fiber tape core wires 2 are arranged in parallel in a direction orthogonal to the longitudinal direction of the plurality of optical fiber core wires 11A to 11L, and are between the plurality of optical fiber core wires 11A to 11L.
- a connecting portion 12 in which adjacent optical fiber cores are connected and a non-connecting portion 13 in which adjacent optical fiber cores are not connected are intermittently provided in the longitudinal direction. It is an intermittently connected optical fiber tape core wire.
- each optical fiber core wire 11A to 11L is, for example, 200 ⁇ m, but may be 250 ⁇ m or 180 ⁇ m. Further, each of the optical fiber core wires 11A to 11L of this example may be a multi-core fiber. Further, only a part of the optical fiber tape core wires 2 may be an intermittently connected optical fiber tape core wire, and only a part of the optical fiber core wires 11A to 11L may be a multi-core fiber.
- the portion where the connecting portion 12 and the non-connecting portion 13 are provided intermittently may be between some optical fiber cores (intermittently every two cores), and all the optical fibers. It may be between the core lines (intermittent for each core).
- FIG. 2 shows an example of intermittently every two cores, and a non-connecting portion 13 is provided between the optical fiber core wires 11A and 11B, 11C and 11D, 11E and 11F, 11G and 11H, 11I and 11J, and 11K and 11L. Not provided.
- the connecting portion 12 of the optical fiber tape core wire 2 is formed by applying, for example, a connecting resin 14 made of an ultraviolet curable resin, a heat curable resin, or the like between the optical fiber core wires.
- a connecting resin 14 made of an ultraviolet curable resin, a heat curable resin, or the like between the optical fiber core wires.
- the connecting resin 14 may be applied to only one side of the parallel surface formed by the parallel optical fiber core wires 11A to 11L, or may be applied to both sides.
- optical fiber tape core wire 2 for example, tape resin is applied to one side or both sides of the parallel optical fiber core wires 11A to 11L to connect all the optical fiber core wires 11A to 11L, and then the optical fiber core wires 11A to 11L are connected. It may be manufactured so as to form the non-connecting portion 13 by cutting a part with a rotary blade or the like.
- the water absorbing tape 3 is wound around the entire plurality of optical fiber tape core wires 2 in a vertical manner or spirally so as to cover the periphery of the plurality of optical fiber tape core wires 2. ing.
- the water-absorbing tape 3 is, for example, a tape that has been subjected to a water-absorbing process by adhering a water-absorbing powder to a base cloth made of polyester or the like.
- the thickness of the water absorbing tape 3 is, for example, 0.3 mm.
- the optical fiber cable 1A is provided with the water absorbing tape 3, but the optical fiber cable 1A does not have to be provided with the water absorbing tape 3.
- the outer cover 4 is arranged outside the plurality of optical fiber tape core wires 2 and is provided so as to include the tensile strength body 5B (tensile body set 50). In this example, the outer cover 4 is provided so as to cover the periphery of the water absorbing tape 3.
- the thickness of the outer cover 4 is, for example, 1.0 mm.
- the jacket 4 is mainly formed of, for example, a vinyl resin such as polyvinyl chloride (PVC) or a polyolefin resin such as polyethylene (PE). Further, the jacket 4 contains a flame-retardant inorganic substance and a lubricant.
- the flame-retardant inorganic substance includes, for example, polyvinyl chloride, flame-retardant polyethylene, and the like.
- the jacket 4 contains 1.5% by mass or more of a lubricant.
- the lubricant includes, for example, a silicon-based lubricant such as silicon or siloxane. If more than 2.5 wt% of the lubricant is added, the optical fiber cable may be unwound and the handleability may be deteriorated. Therefore, the ratio of the lubricant added is preferably 1.5 wt% or more and 2.5 wt% or less.
- the jacket 4 contains a flame-retardant inorganic substance having an oxygen index of 50 or more.
- the oxygen index is one of the flame retardant indexes of plastic materials as described in JIS, K7201-2 (2007).
- the oxygen index referred to here is an index showing the minimum oxygen concentration required for the state in which the plastic is lit as a percentage.
- the oxygen index of general air is 20, and the flame retardancy of a plastic material is indicated with the oxygen index of 20 as a guide.
- a material having an oxygen index of 22 or less is flammable
- a material having an oxygen index of 23 to 27 is flammable but self-extinguishing
- a material having an oxygen index of 27 or more is flame-retardant. Since the jacket 4 of this example has an oxygen index of 50 or more, it can be said that it is flame-retardant.
- the upper limit of the oxygen index is 100.
- Each tensile strength body 5B is arranged along the longitudinal direction of the optical fiber cable 1A and is provided so as to be included in the outer cover 4.
- the diameter of each tensile strength body 5B is, for example, 0.5 mm.
- Each tensile strength body 5B contains an aramid fiber reinforced plastic.
- Each tensile strength body 5B may be formed of fiber reinforced plastic (FRP) such as glass fiber reinforced plastic or carbon fiber reinforced plastic, or a liquid crystal polymer.
- FRP fiber reinforced plastic
- Fiber reinforced plastic (FRP) is generally a flammable material. From the viewpoint of improving the flame retardancy of the entire optical fiber cable 1A, each tensile strength body 5B may be arranged inside the outer cover 4 not near the surface layer of the outer cover 4 but near the center of the optical fiber cable 1A. preferable.
- each tensile strength body 5B in the direction orthogonal to the longitudinal direction is formed in a circular shape.
- the plurality of tensile strength bodies 5B are provided in pairs of four each.
- the four tensile strength bodies 5B as a set are provided, for example, in a state of being close to each other or at least partially in contact with each other.
- the four tensile strength bodies 5B are arranged in a row.
- the four tensile strength bodies 5B that form a set are collectively referred to as a tensile strength body set 50.
- the fiber optic cable 1A comprises at least four tensile strength set 50s.
- four tensile strength body sets 50 are enclosed in the outer cover 4 so as to be separated from each other.
- four tensile strength body sets 50 are arranged at equal intervals from each other.
- the four tensile strength body sets 50 are provided with one set of tensile strength body sets 50 at positions facing each other across the center of the optical fiber cable 1A in the cross section of the optical fiber cable 1A in the direction orthogonal to the longitudinal direction. Has been done.
- the tear string 6 is provided to tear the outer cover 4, and is arranged in the outer cover 4 along the longitudinal direction of the optical fiber cable 1A.
- two tear strings 6 are provided.
- the two tear cords 6 are provided so as to face each other at substantially intermediate positions of adjacent tensile strength body sets 50. Further, the four tensile strength body sets 50 are arranged line-symmetrically with respect to the straight line L connecting the tear string 6 and the center of the optical fiber cable 1A in the cross-sectional view of the cable.
- the operator can tear the outer cover 4 in the longitudinal direction by pulling out the tear string 6 and take out the optical fiber tape core wire 2.
- the tear cord 6 is fibrous and is made of, for example, a pull-resistant plastic material (for example, polyester).
- a plurality of protrusions 7 are provided.
- the two protrusions 7 are provided along the longitudinal direction of the optical fiber cable 1A.
- Each protrusion 7 may be provided continuously along the longitudinal direction, or may be provided intermittently.
- the two protrusions 7 are provided so as to face each other with the center of the optical fiber cable 1A in the circumferential direction of the outer peripheral portion of the outer cover 4 in the radial cross section of the optical fiber cable 1A.
- the protrusion 7 is provided on a straight line L connecting the tear cord 6 and the center of the optical fiber cable 1A.
- the protrusion 7 is formed on the outer peripheral portion of the outer cover 4 in a state of protruding in the radial direction of the optical fiber cable 1A.
- the surface 7a of the protrusion 7 in the direction of protrusion is formed of a curved surface.
- the protrusion 7 is integrally formed with the outer cover 4 by extrusion molding. The presence of the protrusion 7 makes it easy to know the position of the tear string 6. Further, since the friction between the outer cover 4 and the duct is reduced, the pumping distance can be extended.
- the optical fiber cable at the position where the tensile strength body set 50 is included is included.
- the non-uniformity of the rigidity of 1A is improved. Therefore, the optical fiber cable 1A is less likely to buckle during pneumatic feeding.
- the optical fiber cable 1A of the present embodiment includes not only the tensile strength body set 50 included in the outer cover 4 but also the central tensile strength body 5A, the optical fiber cable 1A is difficult to stretch during traction. Therefore, wiring of the optical fiber cable 1A by pneumatic feeding and traction becomes easy.
- the optical fiber cable 1A is provided with a lightweight and highly flexible tensile strength body, and wiring by pneumatic feeding and traction is easy. It becomes.
- the optical fiber cable 1A is provided with a lightweight and highly flexible tensile strength body. If the central tensile strength body 5A is too thick with respect to the diameter of the optical fiber cable 1A, the plurality of optical fiber tape core wires 2 in the cable are likely to be mounted without gaps so that lateral pressure is applied to each other. As a result, cable transmission loss may increase. However, since the diameter of the central tensile strength body 5A of the present embodiment is 3 mm or less, it is possible to suppress the elongation of the cable during towing while suppressing the cable transmission loss.
- the jacket of this embodiment contains 1.5% by mass or more of lubricant, wiring of the optical fiber cable 1A by pneumatic feeding becomes easy.
- the jacket 4 of the present embodiment contains a flame-retardant inorganic substance having an oxygen index of 50 or more, the flame retardancy of the optical fiber cable 1A is further improved.
- optical fiber cable 1A of the present embodiment can also use an intermittently connected optical fiber tape core wire, it has excellent cable accommodation and is easy to perform single core separation.
- each optical fiber core wire of the optical fiber tape core wire 2 may have two cores or eight cores.
- the optical fiber cable 1A accommodates 36 optical fiber tape core wires 2
- each optical fiber core wire of each optical fiber tape core wire 2 has two cores, and the cable outer diameter of the optical fiber cable 1A is large.
- it is 10 mm, a high-density mounting of 11 cores / mm 2 or more per cable cross-sectional area can be realized.
- the optical fiber cable 1A of the present embodiment includes the tear cords 6 arranged along the plurality of optical fiber tape core wires 2, the operator tears the outer cover 4 with the tear cords 6 and individual optical fiber tape cores.
- the wire 2 can be easily taken out.
- the four tensile strength body sets 50 of the optical fiber cable 1A are arranged line-symmetrically with respect to the straight line L connecting the tear string 6 and the center of the optical fiber cable 1A, the non-uniformity of the cable rigidity is further improved. Therefore, the wiring work at the time of pneumatic feeding is further improved.
- a plurality of protrusions 7 protruding in the radial direction of the optical fiber cable 1A are provided on the outer peripheral portion of the outer cover 4. Therefore, when the optical fiber cable 1A is pneumatically fed in the duct, the protrusion 7 comes into contact with the inner wall of the duct, so that the contact area between the outer cover 4 and the duct can be reduced. As a result, the friction between the outer cover 4 and the duct is reduced, and the pumping distance can be extended.
- one tensile strength body set 50 includes four tensile strength bodies 5B, but the number of tensile strength bodies 5B is not limited.
- One tensile strength body set 50 may include one or two, or five or more tensile strength bodies 5B.
- FIG. 2 12-core intermittently connected optical fiber tape core wires are shown, but the number of optical fiber core wires is not limited to this. Further, the plurality of optical fiber core wires may be formed by twisting a plurality of single core optical fibers instead of the tape core wire.
- optical fiber cable 1B according to the modified example of the first embodiment will be described with reference to FIG.
- the same components as those of the optical fiber cable 1A according to the first embodiment are designated by the same reference numerals, and the description thereof will be omitted.
- FIG. 3 is a cross-sectional view perpendicular to the longitudinal direction of the optical fiber cable 1B.
- the outer cover 4 in addition to the configuration of the optical fiber cable 1A according to the first embodiment, includes an inner layer 41 and an outer layer 42.
- the cable outer diameter of the optical fiber cable 1B is, for example, 12 mm.
- the inner layer 41 of the outer cover 4 is arranged outside the plurality of optical fiber tape cores, and is provided so as to include the plurality of tensile strength body sets 50.
- the plurality of tensile strength body sets 50 and the tear string 6 are included in the inner layer 41 of the outer cover 4.
- the inner layer 41 of the outer cover 4 contains, for example, magnesium hydroxide or aluminum hydroxide as a flame-retardant inorganic substance.
- the thickness of the inner layer 41 is, for example, 1 mm.
- the outer layer 42 of the outer cover 4 is arranged outside the inner layer 41.
- the protrusion 7 is provided on the outer peripheral portion of the outer layer 42.
- the outer layer 42 of the outer cover 4 contains a silicon-based lubricant such as silicon or siloxane as a lubricant.
- the thickness of the outer layer 42 is, for example, 0.5 mm.
- the inner layer 41 contains a flame-retardant inorganic substance
- an optical fiber cable 1B having excellent flame retardancy can be realized.
- the outer layer 42 contains a lubricant, the optical fiber cable 1B can be smoothly fed even in the duct during pneumatic feeding. This facilitates wiring.
- the optical fiber cable 1A or the optical fiber cable 1B may be terminated.
- the cable 1X with a connector shown in FIG. 4 includes a multi-core connector 90 attached to a plurality of optical fiber tape core wires 2 at one end of the optical fiber cable 1A or the optical fiber cable 1B.
- the optical fiber core wire 11 is exposed at the end of the multi-core connector 90.
- the number of optical fiber cores 11 shown in FIG. 4 is an example, and is at least 12 or more, but is not particularly limited.
- the optical fiber 1X with a connector may have, for example, 432 optical fiber core wires.
- the allowable tension, pumping distance, cable transmission loss, and mounting density of the optical fiber cable 1A according to the first embodiment were evaluated.
- the central tensile strength body 5A and the plurality of tensile strength bodies 5B are aramid fiber reinforced plastics having a tensile elastic modulus of 6300 kg / mm 2 .
- the allowable tension when the tension was applied to the optical fiber cable 1A, the tension when the cable length was extended by 0.3% was measured as the allowable tension.
- a microduct pumping test defined by IEC (International Electrotechnical Commission) was used.
- a general-purpose microduct was used in the pumping test.
- the inner diameter of the duct is 20 mm.
- the total pumping distance in the duct is 1000 m or more, and the duct is arranged so as to be folded back at every 100 m point.
- the radius of curvature of the duct is 40 times the outer diameter of the duct.
- the pressure in the duct is 1.3 MPa to 1.5 MPa.
- the accommodation rate when 36 optical fiber tape core wires 2 were accommodated in the optical fiber cable 1A was evaluated as a percentage.
- the outer diameter of the optical fiber cable 1A is 11 mm, and the diameter (core diameter) of the space accommodating the plurality of optical fiber tape core wires 2 and the central tensile strength body 5A is 9 mm.
- the tape width of the optical fiber tape core wire 2 is 3.1 mm and the tape thickness is 0.3 mm.
- the mounting density was calculated assuming that the area of the optical fiber tape core wire 2 per wire including the tolerance was 0.786 mm 2 .
- the evaluation results are shown in Table 1.
- sample No. 1 and No. 2 is a comparative example.
- Sample No. The cable structure of No. 1 is a slotless type cable, and the tensile strength bodies included in the outer cover are arranged one above and one below the cable center in the radial cross section of the cable.
- Sample No. The diameter of the tensile strength body of 1 is 0.7 mm.
- sample No. The tensile strength body of 1 is a glass fiber reinforced plastic.
- Sample No. Reference numeral 2 denotes an optical fiber cable in which 16 tensile strength bodies 5B are included in the outer cover, but the central tensile strength body 5A is not provided.
- tensile strength bodies 5B are arranged in a row in one tensile strength body set 50, and the four tensile strength body sets 50 are positioned so as to face each other with the cable center in the radial cross section of the cable. There is one on each of the top, bottom, left and right. Sample No. The diameter of the tensile strength body 5B of 2 is 0.5 mm.
- Sample No. No. 3 to No. Reference numeral 6 denotes an optical fiber cable 1A according to the first embodiment.
- the diameter of the central tensile strength body 5A is different in each sample.
- Sample No. The diameter of the central tensile strength body 5A of No. 3 is 2.0 mm.
- Sample No. The diameter of the central tensile strength body 5A of No. 4 is 2.5 mm.
- Sample No. The diameter of the central tensile strength body 5A of No. 5 is 3.0 mm.
- Sample No. The diameter of the central tensile strength body 5A of No. 6 is 3.5 mm.
- sample No. The permissible tension of No. 1 is 109 N, and the sample No. The allowable tension of 2 was 582N.
- sample No. No. 3 to No. It was confirmed that the permissible tensions of No. 6 were all 1000 N or more. Generally, a tension of 1000 N or more is required for wiring by traction.
- the sample No. including the central tensile strength body 5A Sample No. 3 whose permissible tension does not include the central tensile strength body 5A. It was confirmed that the tension was about twice as much as the allowable tension of 2. From the above, it was confirmed that the optical fiber cable 1A that can be wired by traction can be obtained by providing the central tensile strength body 5A.
- sample No. The cable transmission loss of No. 6 was 0.3 dB / km or more, and the mounting density was 53%. This is sample No. This is because the diameter of the central tensile strength body 5A of No. 6 is 3.5 mm, which is relatively large with respect to the diameter of the optical fiber cable 1A. That is, the sample No. In No. 6, it was confirmed that the mounting density was high and the cable transmission loss was high because the plurality of optical fiber tape core wires 2 in the cable were likely to be mounted without gaps so that lateral pressure was applied to each other. On the other hand, sample No. No. 3 to No. It was confirmed that the cable transmission loss of No. 5 was less than 0.3 dB / km.
- the flame retardant performance of the optical fiber cable 1A was evaluated.
- a test according to a standard defined by European CPR (Construction Products Assessment) was used.
- the flame-retardant performance is evaluated in seven classes of Aca, B1ca, B2ca, Cca, Dca, Eca, and Fca.
- Aca has the highest flame-retardant performance
- Fca has the lowest flame-retardant performance.
- the sample No. No. 3 to No. All of 6 were Cca, and it was confirmed that they had high flame retardant performance.
- Optical fiber cable 1X Cable with connector 2: Optical fiber tape Core wire 3: Water absorbing tape 4: Outer cover 5A: Central tensile strength body 5B: Tensile body 6: Tear string (fibrous inclusions) 7: Protrusion 7a: Surfaces 11A to 11L: Optical fiber core wire 12: Connecting part 13: Non-connecting part 14: Connecting resin 41: Inner layer 42: Outer layer 50: Tensile body set 90: Multi-core connector
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Abstract
Description
本出願は、2021年1月12日出願の日本出願第2021-002862号に基づく優先権を主張し、前記日本出願に記載された全ての記載内容を援用するものである。
中央抗張力体と、
前記中央抗張力体の周囲に配置された複数の光ファイバ心線と、
前記複数の光ファイバ心線の外側に配置された抗張力体セットと、
前記複数の光ファイバ心線の外側に配置された外被と、を備え、
前記外被には、少なくとも四つの前記抗張力体セットが、互いに離隔して内包されている。
前記光ファイバケーブルと、
前記光ファイバケーブルの一端で前記複数の光ファイバ心線に取り付けられた多心コネクタと、を備える。
ルースチューブ型ケーブルは、中央にテンションメンバを備えている。そのため曲げ方向の異方性が無く、空気圧送による配線が容易である。しかしながら、一般的に光ファイバユニットを被覆する樹脂チューブの膜は厚く形成されている。そのため、ルースチューブ型ケーブルの外径を小さくすることや、光ファイバ心線を高密度に実装することは困難である。
まず本開示の実施態様を列記して説明する。
(1)本開示の一態様に係る光ファイバケーブルは、
中央抗張力体と、
前記中央抗張力体の周囲に配置された複数の光ファイバ心線と、
前記複数の光ファイバ心線の外側に配置された抗張力体セットと、
前記複数の光ファイバ心線の外側に配置された外被と、を備え、
前記外被には、少なくとも四つの前記抗張力体セットが、互いに離隔して内包されている。
本開示によれば、中央抗張力体あるいは抗張力体セットはアラミド繊維強化プラスチックを含むため、光ファイバケーブルは軽量かつ可撓性に優れた抗張力体を備えることとなり、空気圧送及び牽引による配線が容易となる。
本開示によれば、中央抗張力体がアラミド繊維強化プラスチックを含むため、光ファイバケーブルは軽量かつ可撓性に優れた抗張力体を備えることとなる。また、中央抗張力体が太すぎる場合、ケーブル内の複数の光ファイバ心線同士が互いに側圧が掛かるほど隙間なく実装された状態となりやすい。その結果、ケーブル伝送損失が高くなることがある。しかしながら本開示の中央抗張力体の直径は3mm以下であるため、ケーブル伝送損失を抑制しつつ、牽引時のケーブルの伸びを抑制することができる。
本開示の外被は滑剤を1.5質量%以上含んでいるため、空気圧送による配線が容易となる。
本開示の外被は酸素指数50以上の難燃性無機物を含んでいるため、光ファイバケーブルの難燃性がより向上する。
本開示によれば、外被の内層が難燃性無機物を含むので、光ファイバケーブルの難燃性を向上することができる。また、外被の外層が滑剤を含むので、空気圧送による配線が容易となる。
本開示の光ファイバケーブルは、間欠連結型光ファイバテープ心線を用いることも可能であるため、ケーブル収容性に優れ、単心分離も行いやすい。
本開示の複数の光ファイバ心線はマルチコアファイバであるため、光ファイバケーブルの伝送容量を増やすことができる。
前記光ファイバケーブルと、
前記光ファイバケーブルの一端で前記複数の光ファイバ心線に取り付けられた多心コネクタと、を備えてもよい。
このような構成により、ケーブル接続が容易となる。
本開示によれば、空気圧送及び牽引による配線が容易な光ファイバケーブル及びコネクタ付きケーブルを提供することができる。
本開示の一形態に係る光ファイバケーブルの具体例を、図面を参照しつつ説明する。
なお、本開示はこれらの例示に限定されるものではなく、請求の範囲によって示され、請求の範囲と均等の意味及び範囲内でのすべての変更が含まれることが意図される。
図1及び図2を参照して、第一実施形態に係る光ファイバケーブル1Aについて説明する。
図1は、光ファイバケーブル1Aの長手方向に垂直な断面図である。図1に示すように、光ファイバケーブル1Aは、中央抗張力体5Aと、複数の光ファイバテープ心線2の形態となった複数の光ファイバ心線と、吸水テープ3と、外被4と、複数の抗張力体5B(抗張力体セット50)と、少なくとも一本の引き裂き紐6(繊維状介在物)と、複数の突起7とを備えている。光ファイバケーブル1Aのケーブル外径は、例えば10mmである。
図3を参照して、第一実施形態の変形例に係る光ファイバケーブル1Bについて説明する。なお、第一実施形態に係る光ファイバケーブル1Aと同様の構成については同じ符号を付しその説明を省略する。
第一実施形態に係る光ファイバケーブル1Aの許容張力、圧送距離、ケーブル伝送損失及び実装密度の評価を行った。本評価実験において、中央抗張力体5Aおよび複数の抗張力体5B(抗張力体セット50)は引張弾性率6300kg/mm2のアラミド繊維強化プラスチックである。許容張力の評価方法として、光ファイバケーブル1Aに張力を印加した場合に、ケーブル長が0.3%伸びた場合の張力を許容張力として測定した。
1X:コネクタ付きケーブル
2:光ファイバテープ心線
3:吸水テープ
4:外被
5A:中央抗張力体
5B:抗張力体
6:引き裂き紐(繊維状介在物)
7:突起
7a:表面
11A~11L:光ファイバ心線
12:連結部
13:非連結部
14:連結樹脂
41:内層
42:外層
50:抗張力体セット
90:多心コネクタ
Claims (9)
- 中央抗張力体と、
前記中央抗張力体の周囲に配置された複数の光ファイバ心線と、
前記複数の光ファイバ心線の外側に配置された抗張力体セットと、
前記複数の光ファイバ心線の外側に配置された外被と、を備え、
前記外被には、少なくとも四つの前記抗張力体セットが、互いに離隔して内包されている、光ファイバケーブル。 - 前記中央抗張力体及び前記抗張力体セットの少なくとも一方は、アラミド繊維強化プラスチックを含む、請求項1に記載の光ファイバケーブル。
- 前記中央抗張力体は、アラミド繊維強化プラスチックを含み、直径が3mm以下である、請求項1または請求項2に記載の光ファイバケーブル。
- 前記外被は滑剤を1.5質量%以上含む、請求項1から請求項3の何れか一項に記載の光ファイバケーブル。
- 前記外被は、酸素指数50以上である難燃性無機物を含む、請求項1から請求項4の何れか一項に記載の光ファイバケーブル。
- 前記外被は、外層と内層を含み、
前記内層は難燃性無機物を含み、
前記外層は滑剤を含む、請求項1から請求項5の何れか一項に記載の光ファイバケーブル。 - 前記複数の光ファイバ心線は、前記長手方向と直交する方向に並列に配置された状態で、前記複数の光ファイバ心線間の一部、または全てにおいて、隣接する光ファイバ心線間が連結された状態の連結部と、隣接する光ファイバ心線間が連結されていない状態の非連結部とが前記長手方向に間欠的に設けられている、間欠連結型光ファイバテープ心線の形態である、請求項1から請求項6の何れか一項に記載の光ファイバケーブル。
- 前記複数の光ファイバ心線はそれぞれ、マルチコアファイバである、請求項1から請求項7の何れか一項に記載の光ファイバケーブル。
- 請求項1から請求項8の何れか一項に記載の光ファイバケーブルと、
前記光ファイバケーブルの一端で前記複数の光ファイバ心線に取り付けられた多心コネクタと、を備えるコネクタ付きケーブル。
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