WO2023149467A1 - Procédé de fabrication de câble à fibre optique, et câble à fibre optique - Google Patents

Procédé de fabrication de câble à fibre optique, et câble à fibre optique Download PDF

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Publication number
WO2023149467A1
WO2023149467A1 PCT/JP2023/003192 JP2023003192W WO2023149467A1 WO 2023149467 A1 WO2023149467 A1 WO 2023149467A1 JP 2023003192 W JP2023003192 W JP 2023003192W WO 2023149467 A1 WO2023149467 A1 WO 2023149467A1
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WIPO (PCT)
Prior art keywords
optical fiber
cable
slot
fiber cable
jacket
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PCT/JP2023/003192
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English (en)
Japanese (ja)
Inventor
文昭 佐藤
健太 土屋
隆郎 平間
里美 井戸
Original Assignee
住友電気工業株式会社
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Application filed by 住友電気工業株式会社 filed Critical 住友電気工業株式会社
Publication of WO2023149467A1 publication Critical patent/WO2023149467A1/fr

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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
    • G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables

Definitions

  • TECHNICAL FIELD The present disclosure relates to a method of manufacturing an optical fiber cable and an optical fiber cable. This application claims priority based on Japanese application No. 2022-015039 filed on February 2, 2022, and incorporates all the descriptions described in the Japanese application.
  • an optical fiber cable there is a slot type cable in which a plurality of optical fiber core wires are accommodated in a slot rod and covered with a jacket.
  • a tube type cable in which an optical fiber unit in which a plurality of optical fiber core wires are bundled is covered with a resin tube, which is bundled and covered with a cable jacket.
  • these optical fiber cables are sometimes wound with a loose winding string formed of a low-melting-point material around the cable core (for example, Patent Documents 1, 2, and 3).
  • each optical fiber unit may be wound with a loose winding string (for example, Patent Document 4).
  • a method for manufacturing an optical fiber cable having a cable core includes: forming the cable core by winding a first loosely wound cord made of a material having a melting point of 120° C. or less around a slot rod containing a plurality of optical fiber core wires in the slot groove; extruding a resin around the cable core to form a jacket of the optical fiber cable; The optical fiber cable with the outer jacket formed thereon is fed into an outer shaping device, and the outer shaping device rounds the outer shape of the optical fiber cable.
  • fiber optic cable a plurality of optical fiber core wires; a slot rod having a plurality of slot grooves configured to accommodate the plurality of optical fiber core wires; a first coarsely wound cord made of a material having a melting point of 120° C. or less and wound around the slot rod housing the plurality of optical fibers; a jacket that covers the slot rod and the first rough winding string on the outer circumference of the slot rod, The number of grooves of the slot groove is 3 or 4.
  • FIG. 1 is a cross-sectional view of a slot-type optical fiber cable according to this embodiment.
  • FIG. 2 is a partially exploded view showing the slot type optical fiber cable of FIG. 1 in the longitudinal direction.
  • FIG. 3 is a schematic configuration diagram showing a slot-type optical fiber cable manufacturing apparatus.
  • 4 is a schematic diagram showing an example of a crosshead and a first water tank in the manufacturing apparatus of FIG. 3.
  • FIG. 5 is a schematic diagram showing an example of a radial cross section of the slot type optical fiber cable in the sizing die of the manufacturing apparatus of FIG.
  • the slot type cable has a slot rod, it is difficult to mount the optical fibers at a high density. Moreover, when a plurality of optical fiber core wires are accommodated in the slot groove of the slot rod and the upper winding tape is wound to form the cable core, some of the optical fiber core wires may fall out of the slot groove. , may be mistakenly accommodated in adjacent slot grooves.
  • the sheath formed on it will also have the same shape, and the originally intended round shape will not be achieved. sometimes it doesn't work. As a result, the packing density of the optical fiber core wires could not be increased to the intended extent.
  • the outer covering resin shrinks when cooled, the internal cross-sectional area of the optical fiber cable becomes smaller, and the density of the optical fiber core wires increases. , the transmission characteristics may deteriorate.
  • An object of the present disclosure is to provide an optical fiber cable manufacturing method and an optical fiber cable that can accommodate optical fiber core wires at high density.
  • a method for manufacturing an optical fiber cable according to one aspect of the present disclosure includes: A method of manufacturing an optical fiber cable having a cable core, comprising: forming the cable core by winding a first loosely wound cord made of a material having a melting point of 120° C. or less around a slot rod containing a plurality of optical fiber core wires in the slot groove; extruding a resin around the cable core to form a jacket of the optical fiber cable; The optical fiber cable with the outer jacket formed thereon is fed into an outer shaping device, and the outer shaping device rounds the outer shape of the optical fiber cable.
  • the first coarse winding string is wound around the slot rod containing a plurality of optical fiber core wires, some of the optical fiber core wires fall out of the slot grooves when forming the cable core. Also, it can be prevented from being erroneously accommodated in an adjacent slot groove.
  • the outer shape of the optical fiber cable can be made into a round shape as designed, and it is possible to prevent the outer shape from becoming an unintended shape. can. As a result, it is possible to suppress the reduction in the cross-sectional area of the optical fiber cable during the formation of the jacket.
  • the resin is extrusion-coated around the cable core, thereby melting the first loosely wound cord and reducing the tension.
  • the optical fiber core wire accommodated between the slot groove and the first rough winding cord when forming the cable core spreads to the vicinity of the jacket after extrusion, and is accommodated in the space between the slot groove and the jacket. be done. Therefore, it is possible to realize an optical fiber cable in which the optical fiber core wires are mounted at a higher density while utilizing the accommodation space more effectively.
  • the outer forming device may include a sizing die.
  • a negative pressure may be applied to at least a partial area within the sizing die, and the optical fiber cable having the jacket formed thereon may be passed through the area.
  • the fiber optic cable having the outer jacket formed thereon is passed through a negative pressure region to expand the air inside the cable and spread the outer jacket from the inside to the outside. can be of a defined shape. As a result, reduction in the cross-sectional area of the optical fiber cable can be suppressed.
  • the first loosely wound string may be spirally wound around the slot rod. According to the manufacturing method of the present disclosure, since the first coarsely wound cord is spirally wound around the slot rod, a portion of the optical fiber core wire may fall out of the slot groove or may enter the adjacent slot groove by mistake. You can prevent being put in.
  • the cable core may be formed by winding a second loosely wound cord around the slot rod together with the first loosely wound cord.
  • the extrusion temperature of the resin when forming the jacket may be higher than the melting point of the first coarsely wound cord and lower than the melting point of the second coarsely wound cord.
  • the extrusion temperature of the resin when forming the outer covering is higher than the melting point of the first coarsely wound string and lower than the melting point of the second coarsely wound string, so that the outer covering is extruded.
  • the first loosely wound cord melts and the tension decreases
  • the second loosely wound cord does not melt and maintains the tension.
  • the second coarse winding string holds down the optical fiber core wires accommodated in the slot grooves, so that the optical fiber core wires are less likely to come apart. Therefore, it is possible to improve workability in removing the jacket while housing the optical fiber core wire in the slot groove.
  • An optical fiber cable a plurality of optical fiber core wires; a slot rod having a plurality of slot grooves configured to accommodate the plurality of optical fiber core wires; a first coarsely wound cord made of a material having a melting point of 120° C. or less and wound around the slot rod housing the plurality of optical fibers; a jacket that covers the slot rod and the first rough winding string on the outer circumference of the slot rod, The number of grooves of the slot groove is 3 or 4.
  • the optical fiber cable of the present disclosure has a relatively small number of slot grooves, ie, 3 or 4. Therefore, since the space for accommodating the optical fiber core wires is relatively large, the optical fiber core wires can be mounted at high density. Furthermore, since the optical fiber cable of the present disclosure includes the first coarsely wound cord made of a material having a melting point of 120° C. or less, the optical fiber core wire is accommodated in space. Therefore, it is possible to realize an optical fiber cable in which the optical fiber core wires are mounted at a higher density while utilizing the accommodation space more effectively. [Effect of the present disclosure]
  • FIG. 1 is a cross-sectional view of a slotted optical fiber cable 1.
  • the slotted optical fiber cable 1 includes a slot rod 2, a first coarse winding string 5, a second coarse winding string 6, a pressure winding tape 3, and a cable jacket 4.
  • the outer diameter of the slot type optical fiber cable 1 is, for example, 24.5 mm.
  • the slot type optical fiber cable 1 has a structure in which a plurality of slot grooves 21 are radially provided in a slot rod 2 having a tension member 23 in the center.
  • the tensile strength member 23 is made of fiber reinforced plastic (FRP), for example.
  • FRP fiber reinforced plastic
  • examples of fiber-reinforced plastics include aramid FRP, glass FRP, and carbon FRP.
  • the tension member 23 may be made of liquid crystal polymer.
  • Strength members 23 are preferably non-inductive.
  • the tensile strength member 23 is circular in cross section.
  • Each slot groove 21 accommodates a plurality of optical fiber ribbons 10 that are rolled up from a parallel state and brought into a dense state.
  • a first loosely wound string 5 and a second coarsely wound string 6 are wound around a slot rod 2 containing a plurality of optical fiber ribbons 10 .
  • a press winding tape 3 is wound around the first coarsely wound string 5 and the second coarsely wound string 6.
  • - ⁇ A cable jacket 4 is formed around the pressing tape 3 .
  • the cable jacket 4 covers the slot rod 2, the first coarse winding string 5, and the second coarse winding string 6 from the outside.
  • the optical fiber ribbon 10 is an example of a plurality of optical fiber core wires.
  • Cable jacket 4 is an example of a jacket.
  • the slot rod 2 is made of, for example, a resin having a Young's modulus of 0.6 GPa or more and 1.8 GPa or less at room temperature. Such resins include, for example, materials used in common slot rods, such as general purpose polyethylene and rigid polyethylene.
  • the slot rod 2 has multiple ribs 22 for forming multiple slot grooves 21 .
  • the slot rod 2 has four ribs 22 (a first rib 221, a second rib 222, a third rib 223 and a fourth rib 224). They are regularly arranged at intervals of 90 degrees around the body 23 . Therefore, the slot-type optical fiber cable 1 is a four-groove slot-type optical fiber cable having four slot grooves 21 . Each slot groove 21 accommodates, for example, 144 optical fiber ribbons 10 .
  • the optical fiber ribbon 10 includes 12 optical fiber cores.
  • the outer diameter of the optical fiber core wire is, for example, 170 ⁇ m or more and 200 ⁇ m or less, and is relatively thin. Twelve optical fibers are arranged in parallel in a direction orthogonal to their longitudinal direction. Between the adjacent optical fiber core wires of at least a part of the optical fiber ribbon 10, the connecting portion in which the adjacent optical fiber core wires are connected and the adjacent optical fiber core wires are not connected.
  • the unconnected portions are provided intermittently in the longitudinal direction of the optical fiber core wire.
  • the connecting portion and the non-connecting portion are intermittently provided every two cores in the longitudinal direction of the optical fiber core wire.
  • the non-connecting portion is formed, for example, by cutting a part of the connecting resin for forming the connecting portion with a rotary blade or the like.
  • each slot groove 21 accommodates 1728 core optical fibers. Therefore, the slot type optical fiber cable 1 has 6912 optical fibers.
  • the first rib 221 has vertex portions 220A and 220B
  • the second rib 222 has vertex portions 220C and 220D
  • the third rib 223 has vertex portions 220E and 220F
  • the fourth rib 224 has vertex portions 220G and 220H. are doing.
  • the vertex portions 220A to 220H are corner portions of each rib 22 and correspond to points where the ribs 22 come into contact with the pressure winding tape 3. As shown in FIG.
  • the vertex portions of the ribs 22 adjacent in the circumferential direction are defined as a center region CR.
  • a region located between the lines L1 to L4 and the pressure winding tape 3 is defined as an outer edge region OR.
  • Optical fiber ribbons 10 are arranged in both the central region CR and the outer edge region OR. In other words, optical fibers are arranged in both the central area CR and the outer edge area OR.
  • the first coarsely wound cord 5 is made of a material with a melting point of 120°C or less.
  • the second loosely wound cord 6 may be made of a material having a melting point of 150° C. or less.
  • the first coarsely wound cord 5 and the second coarsely wound cord 6 are, for example, nylon.
  • the melting point of the second coarsely wound cord 6 is higher than the melting point of the first coarsely wound cord 5 .
  • the melting point of the first coarsely wound cord 5 is 90°C to 115°C
  • the melting point of the second coarsely wound cord 6 is 90°C to 150°C.
  • FIG. 2 is a partially exploded view showing the slot type optical fiber cable 1 in the longitudinal direction.
  • illustration of the plurality of optical fiber ribbons 10 is omitted.
  • the plurality of slot grooves 21 of the slot rod 2 are provided in a spirally twisted shape in the longitudinal direction of the slot type optical fiber cable 1 .
  • the first coarsely wound string 5 and the second coarsely wound string 6 are spirally wound around the slot rod 2 while crossing each other.
  • the winding pitch of the first coarsely wound cord 5 and the second coarsely wound cord 6 is, for example, 10 mm to 50 mm.
  • the plurality of slot grooves 21 may be provided in a twisted shape such as an SZ shape.
  • a cable core C is a state in which at least the first loosely wound cord 5 is wound around the slot rod 2 that accommodates a plurality of optical fiber ribbons 10 in each slot groove 21 .
  • the cable core C may be a state in which the first loosely wound string 5 and the second coarsely wound string 6 are wound around the slot rod 2 .
  • the pressing tape 3 for example, polyethylene terephthalate (PET) may be used as a tape, or a base material such as PET and a non-woven fabric may be used.
  • PET polyethylene terephthalate
  • a water-absorbing agent for example, water-absorbing powder
  • the pressure winding tape 3 is spirally wound around the cable core C from above the first coarsely wound string 5 and the second coarsely wound string 6 .
  • the pressing winding tape 3 may be wound vertically around the cable core C. As shown in FIG.
  • the cable jacket 4 is made of thermoplastic resin such as polyethylene (PE).
  • PE polyethylene
  • the cable jacket 4 contains, for example, a silicon-based lubricant.
  • the cable jacket 4 is formed by extruding a resin around the slot rod 2 and the plurality of optical fiber ribbons 10 around which the pressure winding tape 3 is wound.
  • the thickness of the cable jacket 4 is, for example, 1.2 mm to 1.8 mm.
  • FIG. 3 is a schematic configuration diagram showing a manufacturing apparatus 100 for the slot type optical fiber cable 1.
  • FIG. 4 is a schematic diagram showing an example of the crosshead 131 and the first water tank 140.
  • the manufacturing apparatus 100 includes a supply drum 110, a feeder 120, an extruder 130, a first water tank 140, a second water tank 150, a take-up machine 160, and a take-up drum 170. And prepare.
  • the supply drum 110 supplies the cable core C, which is the inner member of the slot type optical fiber cable 1 .
  • Cable core C contains a plurality of optical fiber ribbons 10 therein.
  • the outer periphery of the cable core C is wound with a pressure winding tape 3.
  • the dispensing machine 120 is equipped with a capstan belt.
  • the feeding machine 120 controls the feeding speed of the cable core C to the extruder 130, for example, based on a control signal from a control device (not shown).
  • the extruder 130 is a device that coats the cable core C with molten resin to form the cable jacket 4 around the cable core C.
  • molten resin for example, a thermoplastic resin such as polyethylene can be used without particular limitation.
  • the extruder 130 has a crosshead 131 .
  • the extruder 130 heats the thermoplastic resin into a molten resin and supplies the molten resin to the crosshead 131 .
  • the cable core C sent from the dispensing machine 120 is formed with the cable jacket 4 at the crosshead 131 and sent to the first water tank 140 as the slot type optical fiber cable 1 .
  • the first water tank 140 is a sizing tank provided for sizing the slot type optical fiber cable 1 .
  • a water tank is used as the sizing tank, but the sizing tank may be configured to contain a medium other than water.
  • the first water tank 140 includes a cooling section 141 , a wire inlet 142 , a sizing die 143 , an exhaust pipe 144 and a vacuum pump 145 . 4, the illustration of the cooling unit 141 and the vacuum pump 145 is omitted.
  • the cooling part 141 is provided upstream of the wire inlet 142 and has a shower hole (not shown). From the shower hole, water or the like for pre-cooling the cable jacket 4 covered with the crosshead 131 is jetted toward the jacket.
  • the cooling unit 141 may be provided at the wire inlet 142 instead of on the upstream side of the wire inlet 142 .
  • upstream refers to the upstream side in the traveling direction of the slot-type optical fiber cable 1 .
  • downstream refers to the downstream side in the traveling direction of the slot type optical fiber cable 1 .
  • the exhaust pipe 144 is a pipe that guides the air inside the first water tank 140 to the outside.
  • a vacuum pump 145 is provided on the exhaust pipe 144 . The vacuum pump 145 discharges the gas inside the first water tank 140 to the outside of the first water tank 140 through the exhaust pipe 144 to make the inside of the first water tank 140 negative pressure.
  • the wire entrance 142 is an entrance to the first water tank 140 and also an entrance to the sizing die 143 .
  • the slot-type optical fiber cable 1 with the outer jacket formed in the crosshead 131 enters the sizing die 143 arranged inside the first water tank 140 from the wire inlet 142 .
  • the sizing die 143 is a die for sizing the slot type optical fiber cable 1 into a desired outer shape (including shape and size).
  • the sizing die 143 has a cylindrical shape, and the shape of the inner circumference is a perfect circle.
  • the inner diameter of the sizing die 143 is equal to the desired outer diameter of the slotted optical fiber cable 1 .
  • the term “equal” in this specification includes not only the case of being strictly equal, but also the case where the difference between the two is sufficiently small and evaluated as being substantially equal.
  • the sizing die 143 is an example of an outer diameter forming device.
  • the sizing die 143 Since the sizing die 143 is placed in the negative pressure first water tank 140, the area inside the sizing die 143 is under negative pressure. Further, as shown in FIG. 4, the sizing die 143 is provided with a plurality of holes 143a. The plurality of holes 143a are provided at predetermined intervals along the circumferential and axial directions of the sizing die 143, for example. By providing the plurality of holes 143a, even when the slot type optical fiber cable 1 is passing through the sizing die 143, it becomes easier to keep the pressure inside the sizing die 143 at the same pressure as that in the first water tank 140. .
  • the distance d between the crosshead 131 and the first water tank 140 shown in FIG. It is preferable to determine according to the drawing speed of the type optical fiber cable 1 .
  • the distance d is preferably 10 mm or more and 600 mm or less.
  • the second water tank 150 is provided downstream of the first water tank 140.
  • the second water tank 150 does not have a vacuum pump 145, and the pressure inside the second water tank 150 is, for example, about the same as the atmospheric pressure.
  • the second water tank 150 is provided for the purpose of cooling the cable jacket 4 of the slot type optical fiber cable 1 .
  • the second water tank 150 may be configured to contain a coolant other than water instead of water.
  • the take-up machine 160 is equipped with a capstan belt.
  • the take-up machine 160 controls the winding speed of the slot type optical fiber cable 1 onto the take-up drum 170 based on, for example, a control signal from a control device (not shown).
  • the winding drum 170 is a drum for winding the slot type optical fiber cable 1 .
  • the manufacturing method of the slot type optical fiber cable 1 includes, for example, a forming process, a pre-cooling process, an incoming line process, a first passing process, and a second passing process.
  • the drawing speed of the optical fiber cable is not particularly limited, but is preferably 5 m/min or more and 40 m/min or less, for example.
  • the forming step is a step of forming the cable core C and forming the cable jacket 4 around the cable core C.
  • a plurality of optical fiber ribbons 10 are collected and supplied to the slot rod 2 drawn out from the supply drum 110 , and a predetermined number of optical fiber ribbons 10 are supplied in each slot groove 21 .
  • a cable core C is formed by winding the first loosely wound cord 5 around it while housing it.
  • an extruder 130 is used to cover the cable core C with molten resin to form the cable jacket 4 .
  • the extrusion temperature (resin temperature of the molten resin) is preferably, for example, 170°C or higher and 210°C or lower.
  • the pre-cooling step is a step of pre-cooling the cable jacket 4 by the cooling unit 141 before the cable core C with the cable jacket 4 formed thereon enters the sizing die 143 .
  • the wire entry step is a step of guiding the cable core C to the wire entry port 142 to enter the sizing die 143 after the pre-cooling step.
  • the first passing step is a step of applying negative pressure to at least a partial region within the sizing die 143 and passing the cable core C through this region.
  • the sizing die 143 since the sizing die 143 is arranged in the first water tank 140 which is made negative pressure by the vacuum pump 145, the entire area inside the sizing die 143 is negative pressure.
  • the pressure inside the sizing die 143 is preferably -60 kPa or more and -5 kPa or less, for example. Since the pressure inside the sizing die 143 is equal to the pressure inside the first water tank 140 , the pressure inside the sizing die 143 can also be controlled by controlling the pressure inside the first water tank 140 .
  • the temperature of the water in the first water tank 140 is preferably 15°C or higher and 50°C or lower, for example.
  • the temperature of the water in the sizing die 143 is equal to the temperature of the water in the first water tank 140 .
  • the time from the formation of the cable jacket 4 in the forming step until the cable core C enters the negative pressure region in the first passing step is preferably more than 0 seconds and 10 seconds or less. This time can be controlled, for example, by adjusting the length of the distance d described above and the linear speed of the cable core C.
  • FIG. 5 is a schematic diagram showing an example of a radial cross section of the slot type optical fiber cable 1 in the sizing die 143. As shown in FIG. Since it overlaps with FIG. 1, the structure inside the slot type optical fiber cable 1 is omitted.
  • the pressure inside the sizing die 143 is negative, the pressure inside the slot-type optical fiber cable 1 is higher than the pressure around the slot-type optical fiber cable 1 . Therefore, when the slot-type optical fiber cable 1 passes through the sizing die 143, the air inside the slot-type optical fiber cable 1 expands, and the cable jacket 4 is expanded radially outward. It comes into contact with the inner wall of the sizing die 143 . Therefore, even if the outer shape of the slot type optical fiber cable 1 is a distorted circular shape before entering the sizing die 143, it is defined by the inner circumference of the sizing die 143 through the first passing step. It becomes a perfect circle. Also, the outer diameter of the slot-type optical fiber cable 1 is substantially equal to the inner diameter of the sizing die 143 .
  • the second passing step is a step of passing the slot-type optical fiber cable 1 through the second water tank 150 after the first passing step.
  • the pressure in the second water tank 150 is set to the same level as the atmospheric pressure.
  • the temperature of the water in the second water tank 150 is preferably 15° C. or higher and 50° C. or lower, for example.
  • the temperature of the water in the second water tank 150 may be the same as or different from the temperature of the water in the first water tank 140 .
  • the cable core C is easily formed because the first loosely wound cord 5 is wound around the slot rod 2 .
  • the shape of the slot-type optical fiber cable 1 is defined by the inner periphery of the sizing die 143 . Therefore, it is possible to suppress the reduction in the cross-sectional area of the slot-type optical fiber cable 1 when forming the cable jacket 4 .
  • the resin is extrusion-coated around the cable core C, thereby melting the first coarsely wound cord 5 and reducing the tension of the first coarsely wound cord 5 . Since the tension of the first coarsely wound cord 5 is reduced after extrusion, the accommodation space for the optical fiber core, which was housed between the slot groove 21 and the first coarsely wound cord 5 when the cable core C was formed, is outside the cable. It spreads to the vicinity of the target 4. That is, after extrusion, the optical fiber core is accommodated in the space between the slotted groove 21 and the cable jacket 4 . Therefore, the optical fibers can be mounted at a higher density while utilizing the accommodation space more effectively.
  • the air in the cable core C is expanded to remove the cable jacket 4 from the inside. It can be splayed outward to give the cable profile a defined shape. Therefore, reduction in the cross-sectional area of the slot-type optical fiber cable 1 can be suppressed.
  • the first coarsely wound cord 5 is spirally wound around the slot rod 2 , a part of the optical fiber core wire does not fall off from the slot groove 21 or the adjacent slot groove 21 You can prevent it from being misplaced.
  • the extrusion temperature of the cable jacket 4 is higher than the melting point of the first rough winding cord 5 and lower than the melting point of the second rough winding cord 6, so the cable jacket 4 is extruded. At this time, the tension of the first coarsely wound cord 5 decreases, but the tension of the second coarsely wound cord 6 is maintained. Even when the cable jacket 4 is removed, the second coarse winding string 6 holds down the optical fiber core wires accommodated in the slot grooves 21, so that the optical fiber core wires are less likely to come apart. Therefore, workability when removing the cable jacket 4 can be improved.
  • the slot type optical fiber cable 1 of this embodiment has a relatively small number of slot grooves 21 of 3 or 4. Therefore, since the space for accommodating the optical fiber core wires is relatively large, the optical fiber core wires can be mounted at high density. Furthermore, since the slot-type optical fiber cable 1 of this embodiment is provided with the first coarsely wound cord 5, the optical fiber core wire is placed in the space between the slot groove 21 and the cable jacket 4, including the vicinity of the cable jacket 4. be accommodated. Therefore, the optical fibers can be mounted at a higher density while utilizing the accommodation space more effectively.
  • the slot-type optical fiber cable 1 has four slot grooves 21 in the above embodiment, it may have three slot grooves 21 .
  • each slot groove 21 accommodates 1728 optical fiber core wires, but the number of optical fiber core wires accommodated in each slot groove 21 may be 800 or more. It is not limited to 1728 fibers.
  • the rib 22 is partially curved at its root portion, but the rib 22 may be entirely curved without a straight portion.
  • the cable core C accommodates a plurality of optical fiber ribbons 10 in the above embodiment, it is not limited to this.
  • a general optical fiber core wire in which adjacent optical fiber core wires among a plurality of optical fiber core wires arranged in parallel are not bonded may be housed in the cable core C.

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Abstract

L'invention concerne un procédé de fabrication d'un câble à fibre optique (1) ayant une âme de câble consistant à : former une âme de câble par enroulement d'un premier cordon d'enroulement grossier (5), qui est formé d'un matériau ayant un point de fusion de 120 °C ou moins, autour d'une tige de fente (2) dans laquelle une pluralité de fils d'âme de fibre optique (10) sont logés à l'intérieur d'une rainure de fente (21) ; former une gaine (4) pour le câble à fibre optique (1) par extrusion et recouvrement de la périphérie de l'âme de câble avec une résine ; et insérer, dans un dispositif de mise en forme extérieur, le câble à fibre optique (1) sur lequel est formée la gaine (4), et amener le dispositif de mise en forme extérieur à rendre circulaire la forme extérieure du câble à fibre optique (1).
PCT/JP2023/003192 2022-02-02 2023-02-01 Procédé de fabrication de câble à fibre optique, et câble à fibre optique WO2023149467A1 (fr)

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JP2022-015039 2022-02-02
JP2022015039 2022-02-02

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