JP5298989B2 - Optical fiber cable branching method and optical fiber cable used therefor - Google Patents

Description

  The present invention relates to an optical fiber cable branching method for branching an optical fiber at an intermediate portion of an optical fiber cable in which a plurality of optical fibers are stored in an optical fiber storage portion of a slot, and an optical fiber cable used therefor.

  In recent years, in order to be able to transmit and receive high-speed and broadband information, an optical fiber cable laid from a telephone station is connected to a subscriber's house such as a general house. In this deduction, in order to increase the efficiency of use of the optical fiber in the optical fiber cable, it is preferable to use the optical fiber after being branched and connected from the middle of the optical fiber cable. For this purpose, it is necessary to take out the optical fiber at an intermediate position. .

  In the optical fiber cable that enables the optical fiber to be taken out at an intermediate position, the rotational directions of the plurality of spiral grooves (optical fiber storage portions 505) for storing the optical fiber core wires 503 provided in the slots 501 shown in FIG. S-twisted cable or Z-twisted cable (one-way twisted optical fiber cable) 507, and SZ twisted cable 509 in which the rotation direction of the optical fiber housing portion 505 shown in FIG. In the figure, reference numeral 511 denotes a strength member, 513 denotes a tape wound around the outer peripheral surface of the slot 501, and prevents the optical fiber core wire 503 from jumping out, and 514 denotes a jacket.

  In the case of the unidirectional twisted optical fiber cable 507, for example, as disclosed in Patent Document 1, branching is performed by stripping the jacket 514 while drawing the extra length. That is, in order to secure the extra length necessary for the optical fiber connection, as shown in FIG. 10A, the optical fiber cable 507 is drawn in advance to form the slack 515, and then the jacket 514 is peeled off. As shown in FIG. 10B, after the connection between the optical fiber core wire 503 and the drop cable 518, the excess length including all the remaining core wires 503 is bundled and cured, and then the connection box (closure). At 517, the entire connection portion of the optical fiber cable 507 is fixed and cured. In the figure, reference numeral 519 denotes a core wire connecting portion.

  Further, in the case of the SZ stranded cable 509, as disclosed in Patent Document 2, for example, branching is performed by a method of stripping off the outer cover 514 for the extra length necessary for connection. After that, as shown in FIG. 11, the optical fiber core wire 503 to be branched is taken out, cut, and connected to the drop cable 518. After the optical fiber connection, the remaining optical fiber core wire 503 was cured, and the entire connection portion of the optical fiber cable 509 was fixed and cured with the connection box 523.

JP-A-10-332951 JP 2000-19333 A

However, the method of branching the optical fiber cable using the unidirectional twisted optical fiber cable 507 has problems that the work is complicated, the closure structure is complicated, and the curing of the core is complicated. In other words, it is necessary to perform many operations for pulling the optical fiber cable 507 after installation and stripping all the cable jackets 514 near the connection portions in the circumferential direction. Since a large extra length occurs in the core wires that are not to be connected, a cumbersome core wire curing operation that bundles and accommodates them and a complicatedly structured closure 517 are required. Further, it is necessary to fix the jacket 514 of the optical fiber cable 507 and the tension member 511 after the connection.
In addition, the method of branching the optical fiber cable using the SZ twisted cable 509 is a little complicated and the curing of the core wire is complicated. That is, it is necessary to remove all the cable jacket 514 near the connection portion in the circumferential direction. Since all the core wires that are not to be connected are also exposed, it is necessary to carry out a cord curing operation that bundles and accommodates them. Further, it is necessary to fix the jacket 514 of the optical fiber cable after the connection.
The present invention has been made in view of the above circumstances, and a first object thereof is a method of branching an optical fiber cable that facilitates the stripping operation of the outer cover and eliminates the need for the curing of the core wire outside the connection target. To improve the branching workability of the optical fiber cable. In addition, the second purpose is to provide an optical fiber cable that eliminates the need for fixing the jacket and tension member and simplifies the closure structure, improving the branching workability of the optical fiber cable, and reducing the closure cost. There is to plan.

The above object of the present invention is achieved by the following configuration.
(1) A long slot having a plurality of partition walls in a cross section perpendicular to the axis, an optical fiber storage section that is partitioned by the plurality of partition walls and formed in the longitudinal direction of the slot, and stored in the optical fiber storage section An optical fiber cable branching method for branching the optical fiber at an intermediate portion of an optical fiber cable covered with a jacket;
Peel off a portion of the outer circumference of the jacket,
Removing at least one of the optical fibers;
A method of branching an optical fiber cable, wherein the optical fiber taken out and another optical fiber cable different from the optical fiber cable are connected.

  According to this optical fiber cable branching method, the stripped portion may be a part in the circumferential direction as compared with the conventional method in which all the jacket in the cable circumferential direction is stripped. Since the core wires that are not to be connected remain covered with the jacket, no curing work is required.

(2) The optical fiber cable branching method of (1),
Cut the outer casing near the first partition wall tip and the outer coating near the second partition wall tip in the longitudinal direction,
A method for branching an optical fiber cable, comprising: stripping a jacket of a portion sandwiched between a first partition and a second partition.

  According to this method of branching an optical fiber cable, when the jacket near the front end of the first partition and the jacket near the second partition tip are cut off, the jacket that was continuous in the circumferential direction is cut off. Is divided between the first partition and the second partition. Therefore, the outer cover whose adhesive strength with the partition wall is not so large can be peeled (extracted) radially outward at a portion sandwiched between the first partition wall and the second partition wall. Thereby, the inside of the optical fiber storage part sandwiched between the first partition and the second partition is opened, and the optical fiber stored inside is exposed.

(3) A method of branching an optical fiber cable according to (2),
A method of branching an optical fiber cable, characterized in that a jacket in the vicinity of the front end of the partition wall is cut off by using a partition recognition means provided on the outer surface of the jacket so as to correspond to the position of the front end portion of the partition wall.

  According to this optical fiber cable branching method, when the outer surface of the jacket is continuous in the circumferential direction, that is, when the tip of the partition wall is embedded in an opaque jacket and cannot be recognized from the outside, By cutting the outer cover with the partition wall recognition means provided on the outer surface as a target, it is possible to easily and reliably cut the outer cover near the front end of the partition wall.

(4) A method of branching an optical fiber cable according to any one of (1) to (3),
After connecting the optical fiber and the previous SL other optical fiber cables, and the surrounding jacket portion peeled portion in the circumferential direction, and the optical fiber cable及beauty connection of said another optical fiber cable, a A method for branching an optical fiber cable, wherein the optical fiber cable is covered with a protective material, and the protective material is fixed to the optical fiber cable.

  According to this method of branching an optical fiber cable, the outer cover from which one part in the circumferential direction is peeled off remains as it is without being cut off from the other part. The strength is not lowered and the exposed optical fiber that is not a connection target is not cured. As a result, only a part of the optical fiber housing part and the connection part opened by peeling off the jacket can be cured with a simple protective material.

(5) A method of branching an optical fiber cable according to any one of (1) to (4),
The optical fiber and the previous SL other optical fiber cable, a method of branching optical fiber cables characterized by connecting a mechanical splice.

According to this optical fiber cable branching method, the optical fiber and another optical fiber cable are easily aligned with each other by mechanical splicing, and a permanent connection is possible.

(6) an elongated slot having a plurality of partition walls in a cross section perpendicular to the axis,
An optical fiber storage section that is partitioned by the plurality of partition walls and formed in the longitudinal direction of the slot;
A plurality of optical fibers stored in the optical fiber storage unit;
Tensile fibers filled in the storage unit,
A jacket covering the outer periphery of the slot;
An optical fiber cable comprising:

  According to this optical fiber cable, the tape conventionally wound around the slot between the slot and the jacket becomes unnecessary, and the tensile fiber filled in each optical fiber storage portion serves as a tension member. When the optical fiber in the optical fiber storage portion is taken out, the tensile strength fiber is scraped and the tensile strength fiber is not cut. That is, the tensile strength fiber serves as both a tension member and a tape of the conventional cable. Since no tape is required, only part of the outer circumference of the jacket can be removed. Further, even after peeling off, it is not necessary to fix both sides of the optical fiber cable at the branching portion.

(7) The optical fiber cable of (6),
An optical fiber cable, wherein a tip end portion of the partition wall protrudes radially outward from an inscribed circle of the jacket in the cross section.

  According to this optical fiber cable, the tip of the partition wall is embedded in the jacket, and the cutting tool blade can reach the tip of the partition wall without cutting the entire thickness of the jacket. Thereby, the outer covering of the portion sandwiched between the adjacent partition walls can be peeled off without causing the blade of the cutting tool to enter the optical fiber storage portion.

(8) The optical fiber cable according to (6) or (7),
The optical fiber cable is characterized in that, in the cross section, the partition wall tip portion is branched into a number equal to or more than twice the number of the optical fiber storage portions.

  According to this optical fiber cable, the tip of each adjacent partition wall is branched into, for example, two, and is embedded in the jacket in a Y shape. Thus, by cutting off the adjacent branch pieces of the Y-shaped tip of adjacent partition walls with a straight line (that is, a string) passing through two points on the circumference, the portion sandwiched between adjacent partition walls in one cut The jacket can be peeled off.

(9) The optical fiber cable according to any one of (6) to (8),
An optical fiber cable characterized in that partition recognition means is provided on the outer surface of the jacket corresponding to the position of the tip of the partition.

  According to this optical fiber cable, by cutting off the jacket with the partition recognizing means provided on the outer surface of the jacket as a target, the tip of the partition is embedded in an opaque jacket and cannot be recognized from the outside. It is possible to easily and surely cut off the outer cover.

(10) The optical fiber cable according to (9),
An optical fiber cable characterized in that a different partition recognition means is provided for each of the plurality of partitions.

  According to this optical fiber cable, even when the optical fiber cable is twisted, the outer cover is stripped off at an arbitrary position in the longitudinal direction by using a specific partition wall recognition means different from others. Thus, the optical fiber housing part at the desired position can be opened.

According to the branching method of the optical fiber cable according to the present invention, a part in the circumferential direction of the jacket is peeled off, at least one of the optical fibers is taken out, and the taken out optical fiber is connected to another optical fiber cable . Compared with the conventional method of stripping all the outer jackets in the cable circumferential direction, stripping work is facilitated, and curing work for the cores not connected is not required. As a result, the branching workability of the optical fiber cable can be greatly improved.

  According to the optical fiber cable according to the present invention, the optical fiber storage section that is partitioned by the partition wall and formed in the longitudinal direction of the slot, the plurality of optical fibers stored in the optical fiber storage section, and the storage section are filled. Since the tensile strength fiber and the jacket covering the outer periphery of the slot are provided, it is not necessary to fix the jacket and the tension member, and the closure structure can be simplified. As a result, the branching operation of the optical fiber cable can be facilitated, and the closure cost can be reduced.

It is sectional drawing of the axial orthogonal direction of the optical fiber cable which concerns on this invention. It is sectional drawing which represented the outer cover cutting condition of the part pinched | interposed by the 1st partition and the 2nd partition before cutting (a) and after cutting (b). FIG. 2 is a side view of the optical fiber cable shown in FIG. 1 partially peeled off. It is a perspective view of a protective material. It is a side view of the branch part protection structure using the protective material of FIG. FIG. 6 is an enlarged side view of a connecting portion fixing groove portion of the protective material shown in FIG. 5. It is sectional drawing of the optical fiber cable by other embodiment. (A) is sectional drawing of the conventional unidirectional twisted optical fiber cable, (b) is the side view which peeled off the outer periphery of a part of the jacket. (A) is sectional drawing of the conventional SZ twisted cable, (b) is the side view which peeled off the outer periphery of a part of the jacket. It is explanatory drawing which represented the drawing condition at the time of using the conventional unidirectional twisted optical fiber cable by (a), and the curing condition in the branch part by (b). It is explanatory drawing showing the condition of the curing in the branch part using the conventional SZ twist cable.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of an optical fiber cable branching method and an optical fiber cable used therefor according to the present invention will be described with reference to the drawings.
FIG. 1 is a sectional view of an optical fiber cable according to the present invention in the direction perpendicular to the axis.
The optical fiber cable 100 includes a slot 11, an optical fiber housing portion 13, an optical fiber 15, a tensile strength fiber 17, and a jacket 19 as main components.

  The slot 11 has a plurality of partition walls 21, 23, 25, 27 and is formed in an elongated shape in a cross section perpendicular to the axis G (perpendicular to the plane of FIG. 1) of the optical fiber cable 100. The partition walls 21, 23, 25, and 27 are formed in a cross shape by a plate-like member to form a four-divided optical fiber housing portion 13, but are not limited to this, and are divided into two, three, and five You may form the optical fiber accommodating part 13 divided | segmented or divided | segmented more than that. Further, as will be described later, each of the partition walls 21, 23, 25, and 27 may have a star shape having branches at the tip or midway.

  The slot 11 may be extruded using a high-density polyethylene or the like, and may be extruded in a cross shape in cross section, or may be formed into a cross shape by combining two plate pieces of integral partition walls 21 and 25 and integral partition walls 23 and 27. It may be formed.

  The slot 11 in this embodiment has a plurality of partition walls 21, 23, 25, 27 integrally formed in a cross-shaped cross section, and an optical fiber storage section 13 partitioned by the partition walls 21, 23, 25, 27. It is formed continuously in the longitudinal direction of the slot 11 (the direction perpendicular to the paper surface of FIG. 1).

  Each optical fiber storage unit 13 stores a plurality of optical fibers 15, and the optical fibers 15 are formed by coating a core wire with an ultraviolet curable resin or the like. The optical fiber 15 may be a tape core wire in which a plurality of optical fibers 15 are arranged in parallel and integrated into a tape shape with an ultraviolet curable resin.

  Each optical fiber storage portion 13 partitioned by the partition walls 21, 23, 25 and 27 is filled with a tensile strength fiber 17. As the tensile fiber 17, an aramid fiber such as poly-p-phenylene terephthalamide fiber, a polyarylate fiber, a polyparaphenylene benzbisoxazole fiber, a polyester fiber such as a polyethylene terephthalate fiber, a nylon fiber, or the like is used. The tensile strength fibers 17 are filled by vertically attaching such fibers to the inside of each optical fiber storage portion 13. The filling may be mixed with the optical fiber 15 or may be vertically added to the outside so as to cover the optical fiber 15 arranged inward. In this case, after the outer sheath 19 is peeled off, the inner optical fiber 15 is taken out so as to scrape the tensile strength fibers 17.

  The outer periphery of the slot 11 in which the optical fiber 15 is accommodated in the optical fiber accommodating portion 13 is covered with an outer sheath 19. The jacket 19 is made of, for example, a material in which high lubricity (low friction) and wear resistance are improved by kneading talc and red phosphorus in a polyethylene resin mixture based on a high-density polyethylene resin. .

  The end portions of the partition walls 21, 23, 25, and 27 protrude outward in the radial direction from the inscribed circle 29 of the outer cover 19 in the cross section. The tip portions of the partition walls 21, 23, 25, and 27 are embedded in the jacket 19, and the cutting tool can be cut at the tip portions of the partition walls 21, 23, 25, and 27 without cutting all the wall thickness of the jacket 19. The blade is reachable. Thereby, without allowing the cutting tool blade to enter the optical fiber storage unit 13, the outer casing 19c sandwiched between adjacent partition walls (for example, the partition walls 21 and 23) can be peeled off.

  In the optical fiber cable 100, the partition wall recognition means 31 is provided on the outer surface of the jacket 19 corresponding to the position of the tip of the partition walls 21, 23, 25, 27. The partition wall recognition means 31 can be, for example, a protrusion as in the present embodiment. In addition, the partition wall recognition unit 31 can be a groove, a printing line, a printing mark, or a continuous printing of codes and numbers. In the optical fiber cable 100, the outer end of the partition wall 19 is cut off with the outer wall 19 being cut off with the partition wall recognition means 31 provided on the outer surface of the outer wall as a target. The surrounding envelope 19 can be easily and reliably cut off.

  Further, the partition recognizing means 31 can have a different form for each of the plurality of partitions 21, 23, 25, 27. Different forms include, for example, size, shape, color, code, and number. Thereby, even if it is a case where the optical fiber cable 100 is twisted, by stripping the jacket 19 with a specific partition recognition means 31 different from others as a guide at an arbitrary position in the longitudinal direction, It is possible to easily open the optical fiber storage portion 13 of the desired section and expose the predetermined optical fiber 15.

  As described above, in the optical fiber cable 100 having the above-described configuration, the tape 513 wound around the slot 501 between the conventional slot 501 (see, for example, FIG. 8) and the jacket 514 becomes unnecessary, and each optical fiber storage portion The tensile strength fiber 17 filled in 13 serves as a tape 513 and a tension member 511 by adjusting the cable shape. When the optical fiber 15 in the optical fiber storage portion 13 is taken out, the tensile strength fiber 17 is scraped and the tensile strength fiber 17 is not cut. That is, the tensile strength fiber 17 serves as both the tension member 511 and the tape 514 of the conventional cable. Since the tape 514 is not required, only a part of the outer circumference direction can be removed. Further, even after peeling off, it is not necessary to fix both sides of the optical fiber cable at the branching portion.

Next, an embodiment of an optical fiber cable branching method according to the present invention will be described.
FIG. 2 is a cross-sectional view showing the state of the outer cut of the portion sandwiched between the first partition and the second partition, before cutting (a) and after cutting (b).
In the branching method according to the present embodiment, the slot 11 is divided into a long slot 11 having a plurality of partition walls 21, 23, 25, 27 in a cross section perpendicular to the axis and a plurality of partition walls 21, 23, 25, 27. 11 is an intermediate portion of the optical fiber cable 100 in which the optical fiber storage section 13 formed in the longitudinal direction of the optical fiber cable 11 and a plurality of optical fibers 15 stored in the optical fiber storage section 13 are covered with a jacket 19. Branching off. First, a part of the outer periphery 19 in the circumferential direction is peeled off, at least one of the optical fibers 15 is taken out, and the taken out optical fiber 15 and the drop cable 41 (see FIG. 5) are connected.

  The optical fiber cable branching method according to this embodiment can be used without using the optical fiber cable 100 having the above-described configuration, or using the conventional optical fiber cables 507 and 509 shown in FIGS. . However, when the conventional optical fiber cables 507 and 509 are used, the blade of the cutting tool must be cut at least to the inscribed circle of the jacket 514. In some cases, the blade is formed on the tape 513 or the core wire 503. There is concern about contact. That is, the work difficulty is high. On the other hand, according to the optical fiber cable 100 having the partition walls 21, 23, 25, and 27, it is possible to peel off the jacket 19 by an extremely easy operation.

  Hereinafter, a branching method when the optical fiber cable 100 having the above configuration is used will be described. In this method of branching the optical fiber cable 100, a jacket 19a near the tip of the first partition wall 21 and a jacket 19b near the tip of the adjacent second partition wall 23 are cut in the longitudinal direction. Next, the outer casing 19 c of the portion sandwiched between the first partition wall 21 and the second partition wall 23 is peeled off.

  When the outer casing 19a near the tip of the adjacent first partition wall 21 and the outer casing 19b near the tip of the second partition wall 23 are cut off, the outer casing 19 that is continuous in the circumferential direction becomes the first partition wall. It is divided between 21 and the second partition wall 23. Therefore, the outer cover 19 that does not have a large adhesive force with the partition walls 21 and 23 can be peeled (extracted) radially outward at a portion 19 c sandwiched between the first partition wall 21 and the second partition wall 23. Thereby, as shown in FIG.2 (b), the inside of the optical fiber accommodating part 13 pinched | interposed by the 1st partition 21 and the 2nd partition 23 is opened, and the optical fiber 15 accommodated in the inside is exposed, Removal is possible.

  The outer casings 19a and 19b in the vicinity of the front ends of the partition walls are cut out with reference to the partition recognition means 31 provided on the outer surface of the outer casing corresponding to the positions of the front ends of the partition walls 21 and 23. When the outer layer of the outer cover 19 is continuous in the circumferential direction, that is, when the tips of the partition walls 21 and 23 are embedded in the opaque outer cover 19 and cannot be recognized from the outside, they are provided on the outer surface of the outer cover 19 By cutting the outer casings 19a and 19b with the partition wall recognition means 31 as a target, the outer casings 19a and 19b in the vicinity of the distal ends of the partition walls 21 and 23 can be easily and reliably cut off.

FIG. 3 is a side view of the optical fiber cable shown in FIG. 1 partially peeled off.
In this branching method, the jacket 19c is peeled off by cutting off the jacket 19a and the jacket 19b. Each outer cover 19a and outer cover 19b can cut only the surface layer in the manner of apple peeling. Accordingly, as compared with the conventional method in which all the outer jacket 514 in the cable circumferential direction is stripped off, the stripped portion may be a part in the circumferential direction, so that stripping work is facilitated. Further, since the optical fiber 15 that is not a connection target remains covered with the jacket 19, no curing work is required.

FIG. 4 is a perspective view of the protective material.
In the optical fiber cable 100, the branch portion can be protected by using the simple and small protective material 43 without using the connection boxes 517 and 523 having the conventional complicated structure. The protective member 43 can have a simple structure in which half cylinders 47 and 47 having bottom walls 45 and 45 at both ends are connected by hinges 49. An insertion hole 51 through which the optical fiber cable 100 is inserted is formed in the bottom walls 45 and 45. A dustproof / waterproof material (such as a gasket) 53 is attached to the inner periphery of the insertion hole 51 and the joint surface of the cylinders 47 and 47. A connecting portion fixing groove 57 for fixing the mechanical splice 55 (see FIG. 6) is formed on the inner wall surface 47a of the cylindrical body 47.

FIG. 5 is a side view of the branch portion protection structure using the protective material of FIG.
After connecting the drop cable 41, the optical fiber 15 taken out from the optical fiber storage unit 13 is connected to the periphery of the outer cover part from which a part in the circumferential direction has been peeled off and the connection part of the optical fiber cable 100 and the drop cable 41 ( The mechanical splice 55) is covered with a protective material 43, and the protective material 43 is fixed to the optical fiber cable 100 with a binding band 59 or the like.

  The outer cover 19 from which a part in the circumferential direction has been peeled off remains as it is without being cut off from other parts. Curing of the outer optical fiber 15 does not occur. As a result, only a part of the optical fiber housing part 13 and the connection part opened by peeling off the jacket 19 can be cured with the protective material 43 having a simple structure.

6 is an enlarged side view of the connecting portion fixing groove of the protective material shown in FIG.
The mechanical splice 55 connecting the optical fiber 15 and the drop cable 41 is fixed to a connection portion fixing groove 57 provided on the inner wall surface 47a of the cylindrical body 47. The optical fiber 15 and the drop cable 41 are easily aligned by the mechanical splice 55, and a permanent connection is possible. Further, since the connecting portion is fixed to the protective material 43 and the protective material 43 is fixed to the optical fiber cable 100, the connecting portion does not rattle inside. As a result, a highly reliable connection that hardly causes sliding or the like is realized by the protective material 43 having a simple structure and an easy branching operation.

  In the present embodiment, an example in which the optical fiber 15 is connected to the drop cable 41 by the mechanical splice 55 has been described. However, the extracted optical fiber 15 may be an optical coupler that demultiplexes and multiplexes optical signals. One may be branched into a plurality of drop cables 41 via an optical device such as an optical splitter. Even in this case, the connection wall fixing groove 57 dedicated to these optical devices can be provided on the inner wall surface 47 a of the protective material 43.

  Therefore, according to the optical fiber cable 100 according to the present embodiment, the optical fiber storage unit 13 that is partitioned by the partition walls 21, 23, 25, 27 and formed in the longitudinal direction of the slot 11, and is stored in the optical fiber storage unit 13. Since the plurality of optical fibers 15, the tensile strength fibers 17 filled in the optical fiber storage portion 13, and the outer sheath 19 covering the outer periphery of the slot 11 are provided, the outer sheath 19 and the tension member need not be fixed. The closure structure can be simplified. As a result, the branching operation of the optical fiber cable 100 can be facilitated, and the closure cost can be reduced.

  Further, according to the branching method of the optical fiber cable 100 according to the present embodiment, the circumferential portion 19c of the jacket 19 is peeled off, at least one of the optical fibers 15 is taken out, and the taken-out optical fiber 15 and drop cable are removed. Since 41 is connected, the stripping work becomes easier and the curing work for the core wire that is not the connection target is not required, as compared with the conventional method of stripping all the outer jacket 19 in the cable circumferential direction. As a result, the branching workability of the optical fiber cable 100 can be greatly improved.

Next, another embodiment of the optical fiber cable according to the present invention will be described.
FIG. 7 is a cross-sectional view of an optical fiber cable according to another embodiment.
In the optical fiber cable according to the present invention, in the cross section, the end portions of the partition walls 21, 23, 25, 27 are the same as twice the number of the optical fiber storage portions 13 (four in the present embodiment) or the same. You may branch to the above number. In the optical fiber cable 100A according to this embodiment, the tip portions of the adjacent partition walls 21, 23, 25, 27 are branched into two, so that they are Y-shaped and are embedded in the jacket 19. .

  According to the optical fiber cable 100A according to this embodiment, straight lines passing through two points on the circumference of the branching pieces 61b, 63a adjacent to each other at the Y-shaped tip portions 61, 63, 65, 67 of the adjacent partition walls 21, 23. By cutting off with the (string) 69, the outer cover 19c of the portion sandwiched between the adjacent partition walls 21 and 23 can be peeled off by one cut.

DESCRIPTION OF SYMBOLS 11 Slot 13 Optical fiber accommodating part 15 Optical fiber 17 Tensile fiber 19 Outer sheath 19a Outer sheath 19b in the vicinity of the first partition tip 19b Outer sheath 19c in the vicinity of the second partition tip 19c sandwiched between the first partition and the second partition 21, 23, 25, 27 Bulkhead 29 Inscribed circle of jacket 31 Bulkhead recognition means 41 Drop cable 43 Protective material 55 Mechanical splice 61, 63, 65, 67 Front end of bulkhead 100 Optical fiber cable G Axis

Claims (8)

A long slot having a plurality of partition walls in a cross section perpendicular to the axis, an optical fiber storage section partitioned by the plurality of partition walls and formed in the longitudinal direction of the slot, and a plurality of slots stored in the optical fiber storage section An optical fiber, and an optical fiber cable branching method for branching the optical fiber at an intermediate portion of the optical fiber cable covered with a jacket,
Peel off a portion of the outer circumference of the jacket,
Removing at least one of the optical fibers;
Connect the optical fiber taken out and another optical fiber cable different from the optical fiber cable ,
After connecting the optical fiber and the other optical fiber cable, the periphery of the outer cover part from which a part in the circumferential direction is peeled off, and the connecting portion of the optical fiber cable and the other optical fiber cable are protective materials. And branching the optical fiber cable, wherein the protective material is fixed to the optical fiber cable. A method of branching an optical fiber cable according to claim 1,
Cut the outer casing near the first partition wall tip and the outer coating near the second partition wall tip in the longitudinal direction,
A method for branching an optical fiber cable, comprising: stripping a jacket of a portion sandwiched between a first partition and a second partition. A method of branching an optical fiber cable according to claim 2,
A method of branching an optical fiber cable, characterized in that a jacket in the vicinity of the front end of the partition wall is cut off by using a partition recognition means provided on the outer surface of the jacket so as to correspond to the position of the front end portion of the partition wall. A method of branching an optical fiber cable according to any one of claims 1 to 3,
A method of branching an optical fiber cable, wherein the optical fiber and the other optical fiber cable are connected by a mechanical splice . A long slot having a plurality of partition walls in a cross section in the direction perpendicular to the axis;
  An optical fiber storage section that is partitioned by the plurality of partition walls and formed in the longitudinal direction of the slot;
  A plurality of optical fibers stored in the optical fiber storage unit;
  Tensile fibers filled in the storage unit,
  A jacket covering the outer periphery of the slot;
  Comprising
  The partition wall is a cross-shaped plate shape,
  The front end of the partition wall is embedded in the outer cover, and the front end protrudes radially outside the inscribed circle of the outer cover in the cross section and from the outer periphery of the outer cover. An optical fiber cable characterized by being also radially inward. An optical fiber cable according to claim 5,
The optical fiber cable is characterized in that, in the cross section, the partition wall tip portion is branched into a number equal to or more than twice the number of the optical fiber storage portions . The optical fiber cable according to claim 5 or 6 ,
An optical fiber cable characterized in that partition recognition means is provided on the outer surface of the jacket corresponding to the position of the tip of the partition . An optical fiber cable according to claim 7 ,
An optical fiber cable characterized in that a different partition recognition means is provided for each of the plurality of partitions .

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