WO2022249756A1 - 光ファイバケーブル - Google Patents
光ファイバケーブル Download PDFInfo
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- WO2022249756A1 WO2022249756A1 PCT/JP2022/016702 JP2022016702W WO2022249756A1 WO 2022249756 A1 WO2022249756 A1 WO 2022249756A1 JP 2022016702 W JP2022016702 W JP 2022016702W WO 2022249756 A1 WO2022249756 A1 WO 2022249756A1
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- WIPO (PCT)
- Prior art keywords
- optical fiber
- fiber cable
- cable
- core wires
- fiber core
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/46—Processes or apparatus adapted for installing or repairing optical fibres or optical cables
- G02B6/50—Underground or underwater installation; Installation through tubing, conduits or ducts
- G02B6/54—Underground or underwater installation; Installation through tubing, conduits or ducts using mechanical means, e.g. pulling or pushing devices
- G02B6/545—Pulling eyes
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
- G02B6/4401—Optical cables
- G02B6/4403—Optical cables with ribbon structure
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
- G02B6/4401—Optical cables
- G02B6/441—Optical cables built up from sub-bundles
- G02B6/4411—Matrix structure
Definitions
- the present disclosure relates to fiber optic cables. This application claims priority based on Japanese application No. 2021-086748 filed on May 24, 2021, and incorporates all the descriptions described in the Japanese application.
- Patent Document 1 discloses a multicore optical fiber cable in which a plurality of optical fiber tape core wires are aggregated and integrated at high density.
- a fiber optic cable includes: a cable main body including 3000 or more optical fiber core wires and a jacket material that accommodates the optical fiber core wires; a multi-fiber connector connected to the end of the optical fiber core wire,
- the outer covering material contains silicone with a mass percentage of 0.2% or more and 1.5% or less.
- FIG. 1 is a diagram illustrating an optical fiber cable according to one aspect of the present embodiment.
- FIG. 2 is a cross-sectional view taken along line AA in FIG.
- FIG. 3 is a plan view showing the intermittent optical fiber ribbon in the longitudinal direction.
- FIG. 4 is a diagram illustrating how an optical fiber cable according to one aspect of the present embodiment is laid.
- FIG. 5 is a diagram illustrating an apparatus used to calculate the static friction coefficient of an optical fiber cable according to one aspect of the present embodiment.
- FIG. 6 is a diagram showing traction tension versus traction length.
- FIG. 7 is a cross-sectional view of another fiber optic cable according to one aspect of the present embodiments.
- An optical fiber cable for outdoor distribution is often fusion-spliced in a junction box such as a closure in the middle of wiring, and is also fusion-spliced or connector-connected at the lead-in portion into the office. For this reason, for example, in the case of an ultra-multi-core optical fiber cable having 3000 or more cores, there is a possibility that fusion splicing may take a long time.
- a super-multi-core optical fiber cable is laid in a duct by a pulling method, if the occupancy rate of the optical fiber cable in the duct is high, there is a risk that the pulling tension will increase and the lineability will deteriorate. Therefore, there is a demand for an optical fiber cable that can improve work efficiency during installation of the optical fiber cable.
- An object of the present disclosure is to provide an optical fiber cable capable of improving work efficiency during installation of the optical fiber cable.
- a fiber optic cable includes: (1) a cable main body including 3000 or more optical fiber core wires and a sheath material for accommodating the optical fiber core wires; a multi-fiber connector connected to the end of the optical fiber core wire,
- the outer covering material contains silicone with a mass percentage of 0.2% or more and 1.5% or less.
- the jacket material of the optical fiber cable having the above configuration contains silicone with a mass percentage of 0.2% or more and 1.5% or less.
- the optical fiber cable according to the above configuration has good lineability. As described above, according to the above configuration, it is possible to improve the work efficiency at the time of laying the optical fiber cable.
- the coefficient of static friction between the outer covering material and the flat plate made of stainless steel is 0.20 or more and 0.46 or less. According to this configuration, since the coefficient of static friction between the jacket material and the flat plate made of stainless steel is 0.20 or more and 0.46 or less, the lineability of the optical fiber cable is good.
- the outer covering material has a polygonal cross section. According to this configuration, since the cross section of the outer covering material is polygonal, in the cross section of the optical fiber cable, when the optical fiber cable is passed through the duct, the portion where the duct and the optical fiber cable come into contact becomes point contact. . Therefore, according to the optical fiber cable having the above configuration, since the frictional resistance when passing through the duct can be reduced, the lineability when laying the optical fiber cable is good.
- the bending rigidity of the optical fiber cable is 25 N ⁇ mm 2 or less, and the variation of the bending rigidity in the circumferential direction of the optical fiber cable is within 5% of the average value of the bending rigidity.
- the optical fiber cable according to such a configuration is easy to bend and can be bent in any direction to a certain degree. is good.
- an optical fiber cable includes (5) The optical fiber core wires are arranged in parallel, and between some or all of the optical fiber core wires, the connecting portion where the adjacent optical fiber core wires are connected and the adjacent optical fiber core wires are connected.
- An intermittently-connected optical fiber ribbon in which the non-connected portions in which the fiber core wires are not connected is intermittently provided in the longitudinal direction is constituted. According to this configuration, since the optical fiber core wires form an intermittently connected optical fiber ribbon, they can be easily bundled into subunits. Therefore, a relatively large number of optical fibers can be accommodated in the cable at high density.
- (6) further comprising a pitch converter provided between the first end of the optical fiber ribbon and the multi-core connector for converting the pitch of the optical fiber core wires; the pitch of the optical fiber core wires in the multi-fiber connector is longer than the pitch of the optical fiber core wires in the optical fiber ribbon;
- the outer diameter of the optical fiber core wire is 160 ⁇ m or more and 185 ⁇ m or less,
- the core density of the cable body is preferably 10 cores/mm 2 or more.
- the optical fiber cable according to one aspect of the present disclosure, (7) further comprising a flexible tube provided on at least one end of the cable main body;
- the multicore connector may be housed in the flexible tube. According to this configuration, since the multi-core connector is housed in the flexible tube, the multi-core connector is not exposed and can be prevented from being damaged or separated during pulling.
- the outer diameter of the flexible tube and the outer diameter of the cable body be 60 mm or less. According to this configuration, the outer diameter of the flexible tube and the cable main body can be made small, and the optical fiber cable can be multi-core and high-density.
- the glass diameter of the optical fiber core wire is 80 ⁇ m or more and 120 ⁇ m or less. According to this configuration, it is possible to prevent the coating thickness of the optical fiber core wire from being thinned, so that it is possible to prevent deterioration of the mechanical strength of the optical fiber cable.
- FIG. 1 An optical fiber cable 1 according to the present embodiment will be described with reference to FIGS. 1 and 2.
- FIG. 2 the terms “front-rear direction”, “left-right direction”, and “up-down direction” will be referred to as appropriate.
- These directions are relative directions set for the optical fiber cable 1 illustrated in FIGS.
- the "vertical direction” is a direction including the “upward direction” and the “downward direction” with the center of the cable as the origin with respect to FIG.
- “Fore-and-aft direction” is a direction including "upward direction” and “downward direction” with respect to FIG. 1 ("forward direction” and "rearward direction” with respect to FIG. 2).
- FIG. 1 is a diagram illustrating an optical fiber cable 1.
- FIG. 2 is a cross-sectional view taken along line AA in FIG.
- the optical fiber cable 1 has a cable body 2, a plurality of multicore connectors 5, a flexible tube 6, a pooling eye 7, and a pitch converter 8.
- the cable body 2 has a slot rod 52 , a plurality of subunits 4 , and a jacket material 3 .
- the slot rod 52 has a tension member 54 in the center, and a plurality of ribs for forming a plurality of slot grooves are radially provided around it in a cross-sectional view.
- the slot groove is formed in a unidirectional spiral or SZ shape along the longitudinal direction of the cable body 2 .
- One or more subunits 4 are housed in each of the plurality of slot grooves.
- the subunit 4 has a plurality of intermittently connected optical fiber ribbons 40.
- the optical fiber ribbon 40 includes, for example, twelve optical fiber core wires 20 .
- the outer diameter of each optical fiber core wire 20 is, for example, 200 ⁇ m.
- the subunit 4 is formed by bundling optical fiber ribbons 40 including optical fiber core wires 20 .
- the subunit 4 is formed by rolling and twisting the optical fiber ribbon 40 .
- the subunits 4 may be twisted together in the slot groove.
- the optical fiber core wire 20 has a glass fiber made of, for example, silica glass, and a coating layer formed around the glass fiber.
- a glass fiber has a core portion and a clad portion.
- the core portion is arranged at the center in the radial direction of the optical fiber cable 20 .
- the clad part is arranged so as to cover the periphery of the core part.
- optical fiber ribbon 40 will now be described in detail with reference to FIG. As illustrated in FIG. 3, the optical fiber ribbons 40 are arranged in parallel in a direction orthogonal to the longitudinal direction of the plurality of optical fiber core wires 20A to 20L. In a part or all of the optical fibers, connecting portions 41 in which the adjacent optical fiber core wires are connected and non-connecting portions 42 in which the adjacent optical fiber core wires are not connected are intermittently provided in the longitudinal direction. It is an intermittently connected optical fiber ribbon.
- the outer diameter of each of the optical fibers 20A-20L is 220 ⁇ m or less, for example 180 ⁇ m or 200 ⁇ m.
- optical fiber core wires 20A to 20L are arranged in parallel.
- the location where the connecting portion 41 and the non-connecting portion 42 are intermittently provided may be between some optical fiber core wires (every two cores intermittently), or between all optical fiber core wires (one core). intermittent).
- the optical fiber ribbon 40 illustrated in FIG. 3 is intermittent for every two cores, and between each of the optical fibers 20A and 20B, 20C and 20D, 20E and 20F, 20G and 20H, 20I and 20J, 20K and 20L. is not provided with the non-connecting portion 42 .
- the connecting portion 41 in the optical fiber ribbon 40 is formed by applying a connecting resin 43 made of, for example, an ultraviolet curable resin, a thermosetting resin, or the like between the optical fibers.
- a connecting resin 43 made of, for example, an ultraviolet curable resin, a thermosetting resin, or the like between the optical fibers.
- the optical fiber ribbon 40 is formed by, for example, applying a tape resin to one side or both sides of the optical fiber core wires 20A to 20L arranged in parallel, connecting all the optical fiber core wires 20A to 20L, and then Alternatively, the non-connecting portion 42 may be formed by cutting a portion of the connecting portion 42 .
- a pressing tape 55 is wound around the slot rod 52 .
- the pressing tape 55 for example, polyethylene terephthalate (PET) formed into a tape shape, or a laminate of a base material such as PET and a non-woven fabric, or the like can be used.
- PET polyethylene terephthalate
- a water-absorbing agent for example, water-absorbing powder
- the outer covering material 3 is formed by extruding and covering the circumference of the pressing tape 55 with an insulating resin. Since the outer cover material 3 is formed along the outer peripheral shapes of the slot rod 52 and the pressure winding tape 55, the cross section of the outer cover material 3 is polygonal.
- the jacket material 3 is made of, for example, a resin composition in which silicone is blended with a resin such as low-density polyethylene. In this embodiment, the outer covering material 3 contains silicone with a mass percentage of 0.2% or more and 1.5% or less. From the viewpoint of suppressing low-temperature shrinkage of the outer covering material 3, the outer covering material 3 may contain an inorganic filler such as magnesium hydroxide or talc.
- the outer diameter of the cable main body 2, that is, the outer diameter of the jacket material 3 is, for example, 28 mm.
- the cable body 2 includes 3000 or more (for example, 3456) optical fibers 20 . Therefore, the optical fiber cable 1 is a super multicore cable.
- the density of the optical fiber core wires 20 in the optical fiber cable 1 is 5.6 cores/mm 2 .
- the core density of the optical fiber cable 1 can be 5 cores/mm 2 or more.
- the multi-fiber connector 5 is, for example, a 12-fiber MPO connector having an MT connector as a base structure.
- the optical fiber cable 1 has 288 multicore connectors 5, for example. These multi-fiber connectors 5 are housed in flexible tubes 6 . Note that FIG. 1 shows only three multi-core connectors 5 for convenience of illustration.
- the multifiber connector 5 is attached to the end of the optical fiber ribbon 40 . That is, the multicore connector 5 is connected to the ends of the optical fibers 20 .
- the flexible tube 6 is a bellows-shaped cylindrical tube and has flexibility.
- a flexible tube 6 is provided at the end of the optical fiber cable 1 .
- the surface of the flexible tube 6 is covered with polyvinyl chloride or the like.
- the outer diameter of the flexible tube 6 is 60 mm or less, and is 60 mm in this embodiment.
- the outer diameter of the flexible tube 6 is larger than the outer diameter of the cable main body 2 and the outer diameter of the cylindrical portion 72 of the pulling eye 7, which will be described later.
- the allowable bending radius of the flexible tube 6 is, for example, 220 mm. However, the allowable bending radius of the flexible tube 6 is not limited to this.
- the flexible tube 6 houses the end of the cable body 2 and the end of the pooling eye 7 .
- the pooling eye 7 is made of a material with sufficient strength to pull the optical fiber cable 1. Such materials include, for example, metals such as iron.
- the pooling eye 7 has an annular portion 71 and a cylindrical portion 72 .
- the annular portion 71 is annular.
- the installer can pull the optical fiber cable 1 by, for example, connecting a wire or the like to the annular portion 71 and pulling the wire with a winch.
- the cylindrical portion 72 has a substantially cylindrical shape. A first end of the cylindrical portion 72 is connected to the annular portion 71 , and a second end of the cylindrical portion 72 is connected to an end of the cable body portion 2 . A portion of the tubular portion 72 is accommodated in the flexible tube 6 .
- the pitch converter 8 is provided between the first end 400 of the optical fiber ribbon 40 and the end of the multi-fiber connector 5 .
- the pitch converter 8 is configured to convert the pitch of the optical fiber core wires 20 into the arrangement pitch of the multi-core connector 5 .
- the pitch of the optical fiber core wires 20 in the optical fiber ribbon 40 is 200 ⁇ m
- the arrangement pitch in the multi-fiber connector 5 is 250 ⁇ m.
- the pitch converter 8 converts the pitch of the optical fiber core wires 20 from 200 ⁇ m to 250 ⁇ m by separating the plurality of optical fiber core wires 20 into single cores and widening the pitch. Thereby, a plurality of optical fibers 20 are connected to the multi-core connector 5 at a pitch of 250 ⁇ m.
- the duct 10 is made of stainless steel, for example.
- the duct 10 is, for example, substantially cylindrical.
- Duct 10 has a plurality of bends. However, the duct 10 may be straight.
- the duct 10 is fixed to the wall surface or the bottom surface.
- the installer runs the wire from the outlet 10b of the duct 10 toward the inlet 10a.
- the installer connects the wire coming out of the inlet 10a to the annular portion 71 of the pooling eye 7 and pulls the wire from the outlet 10b of the duct 10 with a winch.
- the optical fiber cable 1 is inserted through the duct 10 .
- the cross section of the jacket material 3 is polygonal. At , it becomes a point contact.
- the installer pulls the wire connected to the annular portion 71 with a winch until the annular portion 71 comes out of the outlet 10b of the duct 10.
- the installer releases the connection between the annular portion 71 and the wire.
- the installer removes the flexible tube 6 and the pooling eye 7 from the optical fiber cable 1 and connects the multi-core connector 5 to another optical fiber cable, optical communication equipment, or the like. That is, the multi-core connector 5 allows easy connection work without fusion splicing the optical fiber cable 20 included in the optical fiber cable 1 to another optical fiber cable.
- the device 100 includes a first metal plate 101, a second metal plate 102, and four cylindrical members 103. As shown in FIG. The four cylindrical members 103 are inserted through holes provided at the four corners of the first metal plate 101 and the second metal plate 102, respectively. In FIG. 5, only two cylindrical members 103 are shown for convenience of illustration. Further, the first metal plate 101 and the second metal plate 102 are flat plates made of stainless steel in order to imitate the wall surface of the duct 10 .
- the inventor sandwiched the optical fiber cable 1 between the first metal plate 101 and the second metal plate 102 arranged above the first metal plate 101, and applied a load to the second metal plate 102.
- the static friction coefficient of the optical fiber cable 1 was calculated by pulling the optical fiber cable 1 in the longitudinal direction (right direction in FIG. 5) of the metal plate.
- the load applied to the second metal plate 102 is 0.5 kg.
- the longitudinal length of the first metal plate 101 and the second metal plate 102 is approximately 150 mm.
- the pulling speed for the fiber optic cable 1 is approximately 500 mm/min.
- the static friction coefficient was evaluated using the average value of the traction tension.
- the average static friction coefficient of the optical fiber cable having the jacket material to which silicone was not added was 0.54.
- the static friction coefficient of the optical fiber cable 1 having the jacket material 3 to which 0.2% by mass of silicone is added is 0.46
- the jacket to which 0.3% by mass of silicone is added is 0.46.
- the static friction coefficient of the optical fiber cable 1 having the material 3 is 0.36
- the static friction coefficient of the optical fiber cable 1 having the jacket material 3 to which 0.5% by mass of silicone is added is 0.30
- the static friction coefficient of the fiber optic cable 1 having the jacket material 3 to which 1.5% by weight of silicone was added was 0.20.
- the concentration of silicone added to the jacket material 3 was less than 0.2% by mass, the coefficient of static friction was substantially the same as that of the optical fiber cable having the jacket material to which silicone was not added.
- the concentration of silicone added to the outer covering material 3 is 1.5% or more by mass, the rate of decrease in the static friction coefficient of the optical fiber cable 1 slows down, so the effect is sufficient for the cost. was not obtained. From these results, the inventors confirmed that the concentration of silicone added to the jacket material 3 of the optical fiber cable 1 is preferably 0.2% or more and 1.5% or less by mass percentage.
- FIG. 6 is a diagram showing traction tension versus traction length. 6.
- the intersection of each line graph and the straight line X extending in the vertical direction (vertical direction) in FIG. 6 is the tensile tension when the tip of the optical fiber cable 1 reaches the point X in FIG.
- the intersection of the straight line Y and each line graph is the tensile tension at the point when the tip of the optical fiber cable 1 reaches the Y point in FIG.
- the intersection point between the straight line Z and each line graph is the tensile tension at the time when the tip of the optical fiber cable 1 reaches the point Z in FIG.
- the inventor has proposed an optical fiber cable having a jacket material to which silicone is not added in the duct 10 illustrated in FIG. 1 and , respectively, the tensile tension when laying each optical fiber cable was measured.
- the inventors found that the tensile tension required to pass the optical fiber cable 1 having the jacket material 3 to which 0.3% by mass of silicone is added through the duct 10 is It has been found to be about half the pulling tension required to run a fiber optic cable having an unencapsulated jacket through the duct 10.
- the inventors found that when an optical fiber cable 1 having a jacket material 3 to which silicone with a mass percentage of 0.3% is added is passed through a duct 10, a It was also confirmed that there was almost no damage to the optical fiber cable 1 due to friction.
- the flexural rigidity of the optical fiber cable 1 is too high, it becomes difficult to handle. Become. As described above, the bending stiffness is a parameter that affects the lineability of the optical fiber cable 1, so the inventor also calculated the bending stiffness of the optical fiber cable 1 using the double-end support tension method.
- the flexural rigidity of the optical fiber cable 1 is measured when the length of the optical fiber cable 1 is 700 mm, the distance between the jigs is 500 mm, the pressing speed is 200 mm/min, and the displacement of the indenter is 10 mm. Calculated based on force.
- the multicore connector 5 is connected to the end of the optical fiber cable 20 . Therefore, even if the cable main body 2 is a super-multicore cable that requires a lot of time for fusion splicing, the time required for fusion splicing can be shortened.
- the outer covering material 3 contains silicone with a mass percentage of 0.2% or more and 1.5% or less, when the optical fiber cable 1 is laid in the duct 10 by a pulling method, the optical fiber cable 1 and the duct The coefficient of static friction with 10 can be reduced. Therefore, since the optical fiber cable 1 has good lineability, the working efficiency at the time of laying the optical fiber cable 1 can be improved.
- the coefficient of static friction with 102 is 0.20 or more and 0.46 or less. Since the average coefficient of static friction between the jacket material to which silicone is not added and the first metal plate 101 and the second metal plate 102 is 0.54, the optical fiber cable 1 having the jacket material 3 inside the duct 10 Wireability is better than that.
- the cross section of the jacket material 3 is polygonal, and the portion (contact portion 3a) where the duct 10 and the optical fiber cable 1 are in contact is the cross section of the optical fiber cable 1. At , it becomes a point contact. Therefore, the friction generated between the duct 10 and the optical fiber cable 1 is reduced compared to the case where the duct 10 and the optical fiber cable 1 are in contact with each other in the cross section of the optical fiber cable 1 . Therefore, the lineability of the optical fiber cable 1 in the duct 10 is good.
- optical fiber cable 1A differs from the optical fiber cable 1 in that it has a slotless structure without slot rods and has a large number of cores.
- the optical fiber cable 1A includes 48 subunits 4A.
- the subunit 4A includes 288 core optical fibers 20 . Therefore, the optical fiber cable 1A includes 13824 optical fiber core wires 20.
- the outer diameter of the cable body 2 of the optical fiber cable 1A is 35.5 mm. Further, in the present embodiment, the outer diameter of the optical fiber core wires 20 is 160 ⁇ m or more and 185 ⁇ m or less, and the core density of the optical fiber core wires 20 in the optical fiber cable 1A is 10 cores/mm 2 or more. Therefore, it is higher than the density of the optical fiber core wires 20 in the optical fiber cable 1 .
- the optical fiber cable 1A can accommodate the optical fiber core wires 20 at high density without excessively increasing the size of the cable main body 2, so that the duct 10 can be passed through.
- the pitch of the optical fiber core wires 20 is changed from 200 ⁇ m to 250 ⁇ m in order to provide compatibility with the multi-core connector 5, thereby shortening the fusion splicing time. .
- the cross section of the outer covering material 3 is polygonal, but it may be circular, for example.
- the optical fiber cable 1 has the pitch converter 8 in the above embodiment, it does not have to have the pitch converter 8 .
- the multi-core connector 5 is attached to the end of the optical fiber ribbon 40 in the above embodiment, it may also be attached to another end of the optical fiber ribbon 40 .
- the flexible tube 6 may be provided at both ends of the optical fiber cable 1 .
- the diameter of the glass fiber of the optical fiber cable 20 is preferably 80 ⁇ m or more and 120 ⁇ m or less.
- the outer diameter of the optical fiber core wire 20 is about 165 ⁇ m and the glass diameter of the glass fiber of the optical fiber core wire 20 is about 125 ⁇ m
- the coating thickness of the optical fiber core wire 20 is thin, and the mechanical strength is reduced. is likely to worsen. Therefore, by setting the glass diameter of the glass fiber of the optical fiber core wire 20 to 80 ⁇ m or more and 120 ⁇ m or less, it is possible to suppress the thinning of the coating thickness, and as a result, the mechanical strength of the optical fiber cables 1 and 1A is improved. It is possible to suppress the decrease.
- Optical fiber cable 2 Cable main body 3: Jacket material 3a: Contact part 4, 4A: Subunit 5: Multi-core connector 6: Flexible tube 7: Pooling eye 8: Pitch converter 10: Duct 10a : Inlet 10b: Outlet 20 (20A to 20L): Optical fiber core wire 40: Optical fiber ribbon 41: Connection part 42: Non-connection part 43: Connection resin 52: Slot rod 54: Tension member 55: Holding tape 71: Circle Ring part 72: Cylindrical part 100: Device 101: First metal plate 102: Second metal plate 103: Cylindrical member 400: First end
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Abstract
Description
本出願は、2021年5月24日出願の日本出願第2021-086748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。
3000心以上の光ファイバ心線と、前記光ファイバ心線を収容する外被材と、を含むケーブル本体部と、
前記光ファイバ心線の端部に接続された多心コネクタと、を有し、
前記外被材は、質量百分率が0.2%以上1.5%以下のシリコーンを含む。
屋外配線用の光ファイバケーブルは、配線の途中で、クロージャ等の接続箱内で融着接続されるケースが多く、局内への引き込み部分でも融着接続またはコネクタ接続されている。このため、例えば、3000心以上の超多心光ファイバケーブルである場合、融着接続に多大な時間を要する虞がある。また、超多心光ファイバケーブルをダクト内に牽引方式で布設する場合、ダクト内における光ファイバケーブルの占有率が高いと、牽引張力が大きくなり通線性が低下してしまう虞がある。このため、光ファイバケーブルの布設時における作業効率を向上させることが可能な光ファイバケーブルが求められている。
最初に本開示の実施態様を列記して説明する。
本開示の一態様に係る光ファイバケーブルは、
(1)3000心以上の光ファイバ心線と、前記光ファイバ心線を収容する外被材と、を含むケーブル本体部と、
前記光ファイバ心線の端部に接続された多心コネクタと、を有し、
前記外被材は、質量百分率が0.2%以上1.5%以下のシリコーンを含む。
この構成によれば、光ファイバ心線の端部には多心コネクタが設けられているため、融着接続に要する時間を短縮、または無くすことができる。また、上記構成に係る光ファイバケーブルが有する外被材は、質量百分率が0.2%以上1.5%以下のシリコーンを含む。このため、当該光ファイバケーブルをダクト内に牽引方式で布設する場合において、光ファイバケーブルとダクトとの摩擦係数を小さくすることができる。したがって、上記構成に係る光ファイバケーブルは通線性がよい。このように、上記構成によれば、光ファイバケーブルの布設時における作業効率を向上させることができる。
(2)前記外被材とステンレス製の平板との静摩擦係数が0.20以上0.46以下であると好ましい。
この構成によれば、外被材とステンレス製の平板との静摩擦係数が0.20以上0.46以下であるため、光ファイバケーブルの通線性がよい。
(3)前記外被材の断面は多角形状であると好ましい。
この構成によれば、外被材の断面は多角形状であるため、光ファイバケーブルの断面において、光ファイバケーブルをダクトに通線した際にダクトと光ファイバケーブルとが接する部分は点接触となる。このため、上記構成に係る光ファイバケーブルによれば、ダクト通過時の摩擦抵抗を減らすことができるため、光ファイバケーブルの布設時における通線性がよい。
(4)前記光ファイバケーブルの曲げ剛性は25N・mm2以下であり、前記光ファイバケーブルの周方向における曲げ剛性の変動量が、曲げ剛性の平均値の5%以内であると好ましい。
このような構成に係る光ファイバケーブルは曲げやすく、かつどの方向にも一定程度曲げることができるので、例えば、光ファイバケーブルを、複数の湾曲部を有するダクトに通す場合であっても、通線性がよい。
(5)前記光ファイバ心線は、並列に配置された状態で、一部、または全ての前記光ファイバ心線間において、隣接する光ファイバ心線間が連結された連結部と、隣接する光ファイバ心線間が連結されていない非連結部とが長手方向に間欠的に設けられた間欠連結型光ファイバリボンを構成している。
この構成によれば、光ファイバ心線は間欠連結型光ファイバリボンを構成しているため、束ねてサブユニット化しやすい。このため、比較的多くの光ファイバ心線をケーブル内に高密度に収容することができる。
(6)前記光ファイバリボンの第1の端部と前記多心コネクタの間に設けられて、前記光ファイバ心線のピッチを変換するピッチ変換部をさらに有し、
前記多心コネクタにおける前記光ファイバ心線のピッチは、前記光ファイバリボンにおける前記光ファイバ心線のピッチよりも長く、
前記光ファイバ心線の外径は160μm以上185μm以下であり、
前記ケーブル本体部の心密度は10心/mm2以上であると好ましい。
この構成によれば、細径ファイバを用いた高密度の光ファイバケーブルにおいても、光ファイバ心線のピッチをピッチ変換部により予め変換して多心コネクタに接続しておくことで、融着時間を短縮することができる。したがって、上記構成に係る光ファイバケーブルによれば、光ファイバケーブルの布設時における作業効率を向上させることができる。
(7)前記ケーブル本体部の少なくとも一方の端部に設けられる可撓管をさらに有し、
前記多心コネクタは前記可撓管に収容されていてもよい。
この構成によれば、多心コネクタは可撓管に収容されているため、多心コネクタが露出することなく、牽引時にコネクタが破損したり、ばらけたりするのを防ぐことができる。
(8)前記可撓管の外径および前記ケーブル本体部の外径は60mm以下であると好ましい。
この構成によれば、可撓管およびケーブル本体部の外径を細径にしつつ、光ファイバケーブルを多心かつ高密度にすることができる。
(9)前記光ファイバ心線のガラス径は80μm以上120μm以下であると好ましい。
この構成によれば、光ファイバ心線の被覆厚が薄くなることを抑制することができるため、光ファイバケーブルの機械強度が低下することを抑制することができる。
本開示によれば、光ファイバケーブルの布設時における作業効率を向上させることが可能な光ファイバケーブルを提供することができる。
本開示の実施形態に係る光ファイバケーブルの具体例を、以下に図面を参照して説明する。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およ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および図2を参照しつつ、本実施形態に係る光ファイバケーブル1について説明する。なお、本実施形態の説明では、説明の便宜上、「前後方向」、「左右方向」、「上下方向」について適宜言及する。これらの方向は、図1、図2に例示する光ファイバケーブル1について設定された相対的な方向である。ここで、「上下方向」は、図2に対してケーブル中心を原点として「上方向」及び「下方向」を含む方向である。「前後方向」は、図1に対して「上方向」及び「下方向」(図2に対する「前方向」及び「後方向」)を含む方向である。「左右方向」は、図1、図2に対してケーブル中心を原点として「左方向」及び「右方向」を含む方向である。図1は光ファイバケーブル1を例示する図である。図2は、図1におけるA―A線断面図である。
次に、図4を参照しつつ、本実施形態に係る光ファイバケーブル1の布設方法について説明する。なお、本明細書では、地中に設けられたマンホールに配置されたダクト10に光ファイバケーブル1を通線する例を用いて説明する。ダクト10は、例えばステンレスから形成されている。ダクト10は、例えば略円筒状である。ダクト10は、複数の湾曲部を有している。ただし、ダクト10は直線状であってもよい。ダクト10は、壁面や底面に固定されている。
発明者は、光ファイバケーブル1の静摩擦係数を算出するために、図5に例示する装置100を用いて実験を行った。図5に例示するように、装置100は、第一金属板101と、第二金属板102と、四つの円柱部材103と、を備えている。なお、四つの円柱部材103は、第一金属板101と第二金属板102の四隅にそれぞれ設けられた孔部に挿通されている。図5では、図示の都合上、二つの円柱部材103のみを図示している。また、第一金属板101および第二金属板102は、ダクト10の壁面に模すため、ステンレス製の平板としている。
図6は、牽引長に対する牽引張力を示す図である。なお、図6における縦軸方向(上下方向)に延びる直線Xと各折れ線グラフの交点は、図4において、光ファイバケーブル1の先端がX地点に到達した時点での牽引張力である。直線Yと各折れ線グラフの交点は、図4において、光ファイバケーブル1の先端がY地点に到達した時点での牽引張力である。直線Zと各折れ線グラフの交点は図4において、光ファイバケーブル1の先端がZ地点に到達した時点での牽引張力である。
光ファイバケーブル1の曲げ剛性は、大きすぎると取り扱い性が悪くなり、周方向における曲げ剛性の平均値の5%より大きく変動すると、曲げやすさに方向性が出てくるため、通線しにくくなる。このように、曲げ剛性は、光ファイバケーブル1の通線性に影響するパラメータであるため、発明者は、両端支持張り方式により、光ファイバケーブル1の曲げ剛性についても算出した。なお、光ファイバケーブル1の曲げ剛性は、光ファイバケーブル1の長さが700mm、治具の間隔が500mm、加圧速度が200mm/分、圧子変位量が10mmのときの光ファイバケーブル1の反発力に基づいて、算出した。
次に、図7を参照しつつ、本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。なお、本実施形態の説明において、第一実施形態の説明と重複する部分については、同じ符号を付し、適宜説明を省略する。図7に例示するように、光ファイバケーブル1Aは、スロットロッドが無いスロットレス構造であることと、心数が多い点で、光ファイバケーブル1と異なる。
2:ケーブル本体部
3:外被材
3a:接触部
4,4A:サブユニット
5:多心コネクタ
6:可撓管
7:プーリングアイ
8:ピッチ変換部
10:ダクト
10a:入口
10b:出口
20(20A~20L):光ファイバ心線
40:光ファイバリボン
41:連結部
42:非連結部
43:連結樹脂
52:スロットロッド
54:テンションメンバ
55:押さえ巻きテープ
71:円環部
72:筒状部
100:装置
101:第一金属板
102:第二金属板
103:円柱部材
400:第1の端部
Claims (9)
- 3000心以上の光ファイバ心線と、前記光ファイバ心線を収容する外被材と、を含むケーブル本体部と、
前記光ファイバ心線の端部に接続された多心コネクタと、を有し、
前記外被材は、質量百分率が0.2%以上1.5%以下のシリコーンを含む、光ファイバケーブル。 - 前記外被材とステンレス製の平板との静摩擦係数が0.20以上0.46以下である、請求項1に記載の光ファイバケーブル。
- 前記外被材の断面は多角形状である、請求項1または請求項2に記載の光ファイバケーブル。
- 前記光ファイバケーブルの曲げ剛性は25N・mm2以下であり、前記光ファイバケーブルの周方向における曲げ剛性の変動量が、曲げ剛性の平均値の5%以内である、請求項1から請求項3のいずれか一項に記載の光ファイバケーブル。
- 前記光ファイバ心線は、並列に配置された状態で、一部、または全ての前記光ファイバ心線間において、隣接する光ファイバ心線間が連結された連結部と、隣接する光ファイバ心線間が連結されていない非連結部とが長手方向に間欠的に設けられた間欠連結型光ファイバリボンを構成している、請求項1から請求項4のいずれか一項に記載の光ファイバケーブル。
- 前記光ファイバリボンの第1の端部と前記多心コネクタの間に設けられて、前記光ファイバ心線のピッチを変換するピッチ変換部をさらに有し、
前記多心コネクタにおける前記光ファイバ心線のピッチは、前記光ファイバリボンにおける前記光ファイバ心線のピッチよりも長く、
前記光ファイバ心線の外径は160μm以上185μm以下であり、
前記ケーブル本体部の心密度は10心/mm2以上である、請求項5に記載の光ファイバケーブル。 - 前記ケーブル本体部の少なくとも一方の端部に設けられる可撓管をさらに有し、
前記多心コネクタは前記可撓管に収容されている、請求項1から請求項6のいずれか一項に記載の光ファイバケーブル。 - 前記可撓管の外径および前記ケーブル本体部の外径は60mm以下である、請求項7に記載の光ファイバケーブル。
- 前記光ファイバ心線のガラス径は80μm以上120μm以下である、請求項1から請求項8のいずれか一項に記載の光ファイバケーブル。
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| JP2021033206A (ja) * | 2019-08-29 | 2021-03-01 | 株式会社フジクラ | 光コネクタ製造用のピッチ変換治具、光コネクタの製造方法 |
| WO2021045201A1 (ja) * | 2019-09-05 | 2021-03-11 | 住友電気工業株式会社 | 光ファイバテープ心線、光ファイバケーブルおよびコネクタ付光ファイバコード |
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| JP6484279B2 (ja) * | 2017-04-10 | 2019-03-13 | ファナック株式会社 | 光ファイバケーブルユニット |
| US11535752B2 (en) * | 2017-09-28 | 2022-12-27 | Sumitomo Electric Industries, Ltd. | Weather-resistant flame-retardant resin composition, optical fiber cable, and electric wire |
| US20190233321A1 (en) * | 2018-01-26 | 2019-08-01 | Corning Incorporated | Liquid-assisted laser micromachining of transparent dielectrics |
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| JPH11142702A (ja) * | 1997-11-13 | 1999-05-28 | Sumitomo Electric Ind Ltd | 光ケーブル及びその布設方法 |
| US20190004273A1 (en) * | 2017-06-28 | 2019-01-03 | Corning Research & Development Corporation | High fiber count pre-terminated optical distribution assembly |
| WO2020256019A1 (ja) * | 2019-06-19 | 2020-12-24 | 住友電気工業株式会社 | 光ファイバケーブル |
| JP2021033206A (ja) * | 2019-08-29 | 2021-03-01 | 株式会社フジクラ | 光コネクタ製造用のピッチ変換治具、光コネクタの製造方法 |
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