JP2014002189A - End structure of optical fiber cable and manufacturing method of end structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an end structure of an optical fiber cable whose structure is simple and which can be passed through piping and the like easily.SOLUTION: In an end structure of an optical fiber cable, a plurality of optical fiber cords are led out, the plurality of optical fiber cords are externally surrounded with a protective tube, connectors are installed at each end of the plurality of optical fiber cords, and the lead-out length is the length that becomes a prescribed diameter when the connectors are bundled. Also, the end structure of the optical fiber cable includes: a cable fixing part which is installed in the vicinity of the end of the optical fiber cable and holds the optical fiber cable; a traction member fixing part which fixes a traction member; and a protective tube fixing part which joins the cable fixing part and the traction member fixing part to both ends of the protective tube, and fixes the protective tube.

Description

  The present invention relates to an end structure of an optical fiber cable in which a plurality of optical fiber cords each having a connector connected to the end are mounted.

JP 2002-333561 A JP-A-8-240756 JP 2010-39019 A

In general, when an optical fiber cable is laid on a pipe (pipe, etc.), the optical fiber cable is passed through the pipe from the end side without a connector. This is to prevent the connector from being damaged because the diameter of the pipe line is small when passing through the pipe line.
However, such a method requires work such as attachment of a connector after laying, and is said to have poor workability.

For this reason, in order to efficiently pass the optical fiber cable through the pipe in a state where the connector is mounted, various structures of the end portions are considered.
Patent Document 1 and Patent Document 2 contemplate optical fiber cables that can be attached to an optical fiber cord with a connector and a tension member by attaching a cushioning material or the like to the former and a protective tube or the like for the latter and pulling the tip of the tension member. ing.
Patent Document 3 contemplates an optical fiber cable that can be pushed into a pipe with a connector attached.

By the way, if it is going to pass the optical fiber cable which is not processed at the edge part through piping, work will require considerable time.
Further, in the optical fiber cables of the technical documents 1 and 2, a traction portion is attached to a tension member of the cable and the traction portion is pulled and laid, and cannot be used for a cable without a tension member. Furthermore, the structure of the end of the optical fiber cable is complicated, and it takes a lot of time and man-hours to assemble. In addition, the optical fiber cable of the push-in method described in Technical Document 3 has a connection portion directly attached to the end, but the optical fiber cord is intended for a single-core one, and this is applicable to a multi-core one as it is. Can not. Furthermore, with this push-in method, if the pipe is bent, it becomes difficult to pass the pipe.

  An object of the present invention is to provide an end structure of an optical fiber cable that can be applied to an optical fiber cable without a tension member, has a simple structure, and can be easily passed through a pipe or the like.

  The end structure of the optical fiber cable according to the present invention includes a plurality of optical fiber cords each having a connector attached to each end and led out from the optical fiber cable to a predetermined lead length, and the plurality of derived optical fiber cords. A length of the plurality of optical fiber cords having a predetermined diameter when the connectors are bundled, and is attached near the end of the optical fiber cable. A cable fixing portion for holding the traction member, a traction member fixing portion for fixing the traction member, a protection cylinder fixing portion for joining the cable fixing portion and the traction member fixing portion to both ends of the protection cylinder, and fixing the protection cylinder, Is provided.

  The method for manufacturing an end structure of an optical fiber cable according to the present invention includes a plurality of optical fiber cords each having a connector attached to each end and led out from the optical fiber cable to a predetermined lead length, and the plurality of led lights A plurality of the derived optical fiber cords are divided into a plurality of sets, the lengths of the optical fiber cords in each set are the same, and the optical fiber cords for each set Is a method for manufacturing an end structure of an optical fiber cable having a predetermined diameter when the connector is bundled, and the cable holding the optical fiber cable. Attaching a fixing portion near the end of the optical fiber cable; a pulling member fixing portion having a pulling member and a holding member for holding the pulling member; and the cable. And a le fixed portion and a step of joining both ends of the protecting cylinder.

The present invention can be applied to an optical fiber cable without a tension member, has a small diameter and a simple structure, and can be easily passed through a pipe or the like.
In addition, it is economical because the person in charge of construction can assemble it by himself.

It is a figure showing the outline | summary of the structure of the edge part of the optical fiber cable which concerns on embodiment. It is detail drawing of the structure of the edge part of the cable which concerns on embodiment. It is detail drawing of the modification of an edge part. It is the figure which represented the optical fiber network typically.

Hereinafter, embodiments of the present invention will be described in the following order.
<1. Optical fiber cable installation work>
<2. Embodiment>
<3. Modification>

<1. Laying optical fiber cable>

The laying operation of the optical fiber cable will be specifically described with reference to FIG. FIG. 4 is an example of an optical fiber network, and shows the overall configuration thereof.
As shown in FIG. 4, optical fiber cables are connected to factories, companies, homes, and the like.

  In an optical fiber network, an optical fiber cable 19 from a factory, company, home, etc. is connected to an outdoor optical termination box 20 of any power pole via a power pole or the like. Here, two optical fiber cables 19 are connected to the outdoor optical termination box 20. The optical termination box is for housing extra length portions such as a connecting portion of an optical fiber cable and a cord.

The optical fiber cable 18 is connected from the outdoor optical termination box 20 to an indoor optical termination 21 in the building where the communication device 15 is installed via a pipe (pipe). And it connects with the communication apparatus 15 via the indoor optical termination box 21. FIG. At this time, an operation of passing the optical fiber cable 18 through the pipe from the outdoor optical termination box 20 side is required.
The operation of passing the pipe is time consuming because the diameter of the pipe is small and the diameter of the pipe is bent. In addition, careful handling is necessary so as not to damage the optical fiber cable. Furthermore, after passing through the piping, it is required to pass the piping with the connector connected to the end so that the indoor optical termination 21 can be connected immediately.
In the example of FIG. 4, the pipe (pipe) is installed in the basement, but the situation of the laying operation of the optical fiber cable is the same as the above, wherever the pipe is installed.

<2. Embodiment>

An embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows an outline of the structure of an end portion of an optical fiber cable. FIG. 2 shows the detailed structure of the end portion.
In FIG. 1, FIG. 1A shows the schematic structure 1 of the end part of an optical fiber cable, and FIG. 1B, FIG. 1C, and FIG. 1D show arrangement | positioning of the optical fiber cord to which the connector was attached. 1A will be described.

As shown in FIG. 1A, optical fiber cords 5, 6, and 7 are led out from the end of the optical fiber cable 4, and connectors 8, 9, and 10 are connected to the ends, respectively. It can be seen that the overall size of the diameter when the optical fiber cords are bundled is determined by the way the connectors overlap.
By changing the way in which the connectors are overlapped, the overall size of the diameter when the optical fiber cords are bundled can be changed. Thereby, the magnitude | size of the whole diameter can be made into a predetermined magnitude | size according to the magnitude | size of the protection cylinder 3. FIG.

For example, if the lengths of the derived optical fiber cords 5, 6, and 7 are all made different as shown in the figure, the overall diameter when the optical fiber cords are bundled can be reduced. However, the lengths of the derived optical fiber cords 5, 6, and 7 are longer.
Further, if the lengths of the derived optical fiber cords 5, 6, and 7 are all the same, the connectors are overlapped, so that the overall diameter increases, and the derived optical fiber cords 5, 6, and 7 are increased. The length of becomes shorter.
Furthermore, by combining a plurality of connectors and using them as one unit, and varying the length of each unit, the size of the entire diameter when the optical fiber cords are bundled can be finely adjusted. That is, it is preferable that the derived optical fiber cords are divided into a plurality of sets, the derived lengths of the optical fiber cords in each set are the same, and the derived lengths of the optical fiber cords for each set are different.

  The optical fiber cords 5, 6 and 7 are accommodated in the protective cylinder 3. One end (optical fiber cable side) of the protective cylinder 3 is joined to the fixing portion 33. The fixing portion 33 simultaneously holds and fixes one end of the optical fiber cable 4. Furthermore, the other end of the protective cylinder 3 is joined to the pulling member 12 and a fixing portion 33 that holds and fixes the pulling member 12.

Next, the case where the connectors do not overlap and the case where the connectors overlap each other will be specifically described with reference to FIGS. 1B, 1C and D. FIG. FIG. 1B shows a case where the positions of the connectors of the optical fiber cord according to the embodiment of the present invention are shifted. As shown in FIG. 1B, the position of each connector is shifted from the end of the optical fiber cable. The length is adjusted so that each connector does not overlap with the longitudinal direction of the optical fiber cable 4. As a result, when the optical fiber cord with the connector attached is bundled, the axial width becomes e which is a predetermined width as small as possible and can be stored in the protective cylinder 3 having a small diameter.
The distance from the connector to the end of the optical fiber cable 4 is appropriately adjusted according to the size of the connector. If the connectors are not overlapped when bundled, the diameter can be minimized. A plurality of connectors may be attached by shifting their positions so that a plurality of connectors are combined as one unit so that they do not overlap each other.

  For example, two connectors can be used as one unit (every two cores), and four connectors can be used as one unit (every four cores). FIG. 1C shows an example in which two connectors are used as one unit (for every two cores). As shown in FIG. 1C, two connectors 8a and 8b and connectors 9a and 9b are used as one unit so that they do not overlap. In this case, optical fiber cords 5a and 5b are connected to the connectors 8a and 8b, respectively, and optical fiber cords 6a and 6b are connected to the connectors 9a and 9b, respectively. Also by this method, the size of the entire diameter when the optical fiber cords are bundled can be adjusted, and the width in the axial direction can be set to e ′.

  In addition, by stacking, or not overlapping, any of the three types of ones, one with multiple connectors, one with multiple connectors of different numbers, or one connector It is also possible to adjust the bundled diameter to a predetermined diameter so that the diameter can be accommodated in the protective cylinder 3 according to the diameter of the protective cylinder 3.

  FIG. 1D shows a case where all of the plurality of connectors overlap. As shown in FIG. 1D, the length from the end of the optical fiber cable to each connector is the same. In this case, when the optical fiber cord is bundled, the width in the axial direction becomes e ″, and the outer diameter of the portion where the connector is bundled is larger than that of e in FIG. 1B, but the lead-out length of the optical fiber cord is short. Become.

Next, a detailed structure of the end portion of the optical fiber cable 4 according to the embodiment of the present invention will be described with reference to FIG.
As shown in FIG. 2A, the cable fixing portion on the optical fiber cable 4 side includes a fixing member 2 a, a holding member 14 a, a seal 31, and a tightening member 11.
The fixing portion at the end of the protective cylinder 3 on the optical fiber cable side is composed of a fastening member 16, a holding member 14b, and a protective cylinder fixing member 2b.
Both the fixing member 2a and the protective cylinder fixing member 2b are formed with screws at both ends. In the fixing member 2a, the screws at both ends are formed outside. In the protective cylinder fixing member 2b, the screw at one end is formed on the outside and the screw at the other end is formed on the inside. And the fixing member 2a and the protection cylinder fixing member 2b are screw-joined by the screw formed in the outer side, and the screw formed in the inner side. The fixing member 2a and the protective cylinder fixing member 2b exhibit the same function in the present embodiment, and basically only the screw positions are different.

The fixing part at the end of the protective cylinder 3 on the traction part side is composed of a fastening member 16, a holding member 14b, and a protective cylinder fixing member 2b.
The fixed portion of the pulling member 12 on the pulling side includes a fixing member 2a, a holding member 14a, a tightening member 11, and a pulling member 12. The fixing member 2a and the protective cylinder fixing member 2b are screwed in the same manner as described above.

A mode of fixing the optical fiber cable 4, a mode of fixing the protective tube 3 on the side of the optical fiber cable, a mode of fixing the protective tube 3 on the side of the traction portion, and a mode of fixing the traction member 12 will be described below.
(A) Aspect of fixing optical fiber cable 4 First, the optical fiber cable 4 with the connector-attached optical fiber cord exposed is passed through the through hole of the right fastening member 11, and the holding member 14a, the seal 31, the fixing member It penetrates to 2a. The optical fiber cord with a connector exposed from the optical fiber cable 4 is penetrated to the protective cylinder 3 via the protective cylinder fixing member 2b, the holding member 14b, and the fastening member 16.
In this state, the protective seal 31 and the holding member 14a are pushed through the right through hole of the fixing member 2a. Then, by tightening the fastening member 11 to the fixing member 2a, the outer periphery of the optical fiber cable 4 can be surrounded and fixed by the holding member 14a.

FIG. 2B shows a cross-sectional structure of the fastening member 11, the holding member 14a, the seal 31, and the fixing member 2a. As shown in FIG. 2B, a screw is formed on the outer periphery of the fixing member 2a, and a screw is formed on the inner periphery on the left side of the fastening member 11. The fixing member 2a and the fastening member 11 are screwed together by this screw. The seal 31 is inserted into the holding member 14a from the left side. Then, the holding member 14 a and the seal 31 are pushed into the space formed by the fixing member 2 a and the fastening member 11. And the optical fiber cable 4 penetrates the center part.
FIG. 2C is an assembly drawing and shows a state in which the fastening member 11, the holding member 14a, the seal 31, and the fixing member 2a are assembled. As shown in FIG. 2C, the fixing member 2a and the tightening member 11 are screw-joined, and the holding member 14a and the seal 31 are mounted in a space surrounded by the fixing member 2a and the tightening member 11 in a compressed state. . An optical fiber cable is passed through the center, and is held and fixed.

The holding member 14a mounted inside the fixing member 11 has the tip of the holding member 14a tapered and the through hole of the fastening member 11 is narrowed in the fastening direction. As the fixing member 2a is tightened, it is compressed smoothly. For this reason, the optical fiber cable 4 can be securely fixed and held.
In the present embodiment, the state where the sheath 31 is attached is shown, but the sheath 31 protects the optical cable and is not necessarily required in the present invention. The sheath 31 is elastic.

The material of the holding member 14a is made of resin or metal. The holding member 14 a has one slit in the longitudinal direction, and when the pressure is applied from the outside periphery by tightening the holding member 14, the diameter is reduced and the inserted optical fiber cable 4 can be fixedly held. Further, when the pressure is removed (the screw is loosened), it returns to its original state by elasticity and can be easily detached from the optical fiber cable 4. Although FIG. 2 shows a member in which one of the slits is inserted in the longitudinal direction of the holding member 14a, the present invention is not limited to this, and a plurality of slits may be included.
Further, the material is not limited to resin or metal, and other members (for example, rubber-like members) can be adopted as long as they are elastic bodies without departing from the spirit of the invention. In addition, the slit is not necessarily required if it is a rubber-like member or other elastic body.

(B) About the aspect of fixation of the protection cylinder 3 by the side of an optical fiber cable One end of the protection cylinder 3 by the side of an optical fiber cable is fixed by the protection cylinder fixing member 2b, the holding member 14b, and the fastening member 16. First, the optical fiber cable 4 with the connector-attached optical fiber cord exposed is passed through the through hole of the right fastening member 11 and penetrates to the holding member 14a, the seal 31, and the fixing member 2a. The optical fiber cord with a connector exposed from the optical fiber cable 4 is penetrated to the protective cylinder 3 via the protective cylinder fixing member 2b, the holding member 14b, and the fastening member 16.
The protective cylinder 3 is in a state in which the optical fiber cord led out from the optical fiber cable 4 is accommodated. In this state, one end of the protective cylinder 3 is passed through the left through hole of the fastening member 16, and the holding member 14b is pushed into the protective cylinder fixing member 2b.

Next, by tightening the fastening member 16 to the protective cylinder fixing member 2b, the holding member 14b is compressed, and one end of the protective cylinder 3 can be surrounded and held by the holding member 14b. Further, the derived optical fiber cord is passed through the center of the holding member 14b. The holding member 14b and the holding member 14a are functionally the same, but have different shapes and diameters depending on what is fixedly held.
By tightening the tightening member 16, the holding member 14b is compressed, the diameter is reduced, and the protective cylinder 3 is fixed. This is the same as the case where the optical fiber cable 4 is fixed.
The protective cylinder fixing member 2b and the fixing member 2a are screw-joined as described above.

(C) About the aspect of fixing the protection cylinder 3 on the traction part side
One end of the protection cylinder 3 on the traction portion side is fixed by the fastening member 16, the holding member 14b, and the protection cylinder fixing member 2b. One end of the protective cylinder 3 on the traction portion side is passed through the right through hole of the tightening member 16, and the holding member 14b is pushed into the protective cylinder fixing member 2b. Next, by tightening the fastening member 16 to the protective cylinder fixing member 2b, the holding member 14b is compressed, and the one end of the protective cylinder 3 on the traction portion side can be fixed and held by the holding member 14b.

2D and 2E show cross-sectional structural views and assembly drawings of each member for fixing the protection cylinder 3 on the traction portion side. 2D and 2E correspond to FIGS. 2B and 2C, respectively.
FIG. 2D shows a cross-sectional structure of the fastening member 16, the holding member 14b, and the fixing member 2b. As shown in FIG. 2D, one of the fixing members 2b has a screw formed on the outer periphery, and the other one has a screw formed on the inner periphery. A screw is formed on the inner periphery on the left side of the fastening member 16. By this screw, one outer periphery of the fixing member 2b and the tightening member 11 are screw-joined. The holding member 14b is pushed into the space formed by the fixing member 2b and the fastening member 16. And the protection cylinder 3 is arrange | positioned in the center part.
FIG. 2E is an assembly drawing and shows a state in which the fastening member 16, the holding member 14b, and the fixing member 2b are assembled. As shown in FIG. 2E, the fixing member 2b and the fastening member 16 are screw-joined, and the holding member 14b is mounted in a space surrounded by the fixing member 2b and the fastening member 16 in a compressed state. A protective cylinder 3 is disposed at the center, and is held and fixed.

(D) About the aspect of fixation of the traction member 12
The pulling member 12 is fixed by the fixing member 2a, the holding member 14a, and the tightening member 11. The pulling member 12 is passed through the left through hole of the tightening member 11, and the holding member 14a is pushed into the fixing member 2a. Next, when the fastening member 11 is fastened to the fixing member 2a, the holding member 14a is compressed and one end of the traction member 12 can be fixed and held by the holding member 14a. The fastening member 2b and the fastening member 2a are screwed together as described above.
With the above configuration, the pulling member 12, the protective cylinder 3, and the optical fiber cable 4 are securely fixed, and even if the pulling member 12 is pulled, the optical fiber cable 4 is securely attached to the target pipe or the like without dropping. Can pass through.

<3. Modification>

Next, a modification of the embodiment of the present invention will be described with reference to FIG. 3A will be described. FIG. 3A shows a modification of the method for fixing the protective cylinder 3. As shown in FIG. 3A, the optical fiber cable 4 on the optical fiber cable side is fixed by the fastening member 11, the holding member 14a, and the fixing member 32, except for the embodiment of FIG. Are basically the same.
Further, the fixed portion of the traction member 12 on the traction side is composed of the traction member 12, the fastening member 11, the holding member 14a, and the fixing member 32, and is basically the same as the embodiment of FIG. The method of fixing the protective cylinder 3 is different from the embodiment of FIG.

In the embodiment of FIG. 2, the protection cylinder 3 is fixed in the same configuration as the optical fiber cable 4 and the pulling member 12.
In this modification, both ends of the protective cylinder 3 are screwed to the bolt portion of the fixing member 32. Screws are formed inside both end portions of the protective cylinder 3. One end of the fixing member 32 is formed with a screw on the outside, and the other end is formed with a screw on the inside.
The fixing member 32 is disposed at both ends of the protective cylinder 3, and the protective cylinder 3 and the fixing member 32 are joined by a screw inside the protective cylinder 3 and a screw on one end side of the fixing member 32.
With the above configuration, the pulling member 12 and the optical fiber cable 4 are securely fixed, and even if the pulling member 12 is pulled, the optical fiber cable 4 does not fall out, and the optical fiber cable 4 can be surely passed through the target pipe or the like. it can.

FIG. 3B will be described. As shown in FIG. 3B, the fastening member 11 is omitted from the modification of FIG. 3A.
The optical fiber cable 4 is inserted through the holding member 23, and the optical fiber cable 4 is fixed by the fastening member 24 and the holding member 23. Unlike the case of FIG. 3A, the surface of the holding member 23 is threaded. Further, a screw is cut inside the fixing member 24. When the fixing member 24 is tightened, the fixing member 24 and the holding member 14 are screwed together. At the same time, the diameter of the holding member 14 is reduced to reduce the optical fiber. Secure the cable 4 securely. Thereby, even if it pulls with the fastening member 24, the optical fiber cable 4 can be reliably passed through the target piping or the like without falling off.

  FIG. 3C will be described. As shown in FIG. 3C, the bonding of the fixing member 25 and the protective cylinder 26 is different from the modification of FIG. 3B. That is, the protrusion 17 is formed on the protective cylinder 26, and the protective cylinder 26 is inserted into the fixing member 25 from the direction without the protrusion 17, and is joined so that the protective cylinder 26 does not fall out of the fixing member 25 with the protrusion 17. To do. The joining of the fixing member 25, the holding member 23, and the optical fiber cable 4 is the same as that of the modification of FIG. 3B.

  3D will be described. FIG. 3D shows a modification on the traction side. As shown in FIG. 3D, the traction member 27, the protective cap 22, the holding member 13, and the stop member 28 are configured. Instead of fixing the traction member 27 by reducing the diameter of the holding member 13 as in the embodiment of FIG. 2A, the protective cap 22 and the holding member 13 are attached to the traction member 27, and the stop member 28 is attached to the traction member 27. The traction member 27 is fixed by screwing.

  An optical fiber cable having a structure as described above can maintain sufficient strength even when pulled from the far end of the pipe, and prevent damage to the connector, etc. It is excellent and easy to handle.

DESCRIPTION OF SYMBOLS 1 Optical fiber cable end structure, 2a 2b 24 25 32 fixing member, 3 26 protective cylinder, 4 18 19 optical fiber cable, 5 5a 5b 6 6a 6b 7 optical fiber cord, 8 8a 8b 9 9a 9b 10 connector, 11 16 22 Tightening member, 12 27 Traction member, 13 14a 14b 23 Holding member, 15 Communication device, 17 Protruding part, 20 21 Optical termination box, 28 Stopping member, 33 Fixing part

Claims (7)

Each of the plurality of optical fibers includes a plurality of optical fiber cords each having a connector attached to each end thereof and led out from the optical fiber cable to a predetermined lead-out length, and a protection tube that stores the plurality of lead-out optical fiber cords. The lead-out length of the fiber cord is an end structure of an optical fiber cable having a predetermined diameter when the connectors are bundled,
A cable fixing part that is attached near the end of the optical fiber cable and holds the optical fiber cable;
A traction member fixing portion for fixing the traction member;
A protective cylinder fixing portion for joining the cable fixing portion and the pulling member fixing portion to both ends of the protective cylinder and fixing the protective cylinder;
An end structure of an optical fiber cable comprising: The cable fixing part is
A cable holding member for holding and holding the optical fiber cable, and
A fastening member for compressing the cable holding member;
A fixing member for mounting the fastening member,
The cable holding member fixes the optical fiber cable by attaching the fastening member to the fixing member in a state where the cable holding member is pushed into the fixing member, and fastening the fastening member and the fastening member. 2. An end structure of the optical fiber cable according to 1. The pulling member fixing part is
A traction member holding member for fixing and holding the traction member;
A clamping member for compressing the traction member holding member;
A fixing member for mounting the fastening member,
The traction member holding member fixes the traction member by attaching the clamping member to the fixing member in a state where the traction member holding member is pushed into the fixing member, and tightening the fixing member and the clamping member. The end structure of the optical fiber cable according to claim 1 or claim 2. The protective cylinder fixing part is
A protective cylinder holding member that fixes and holds both ends of the protective cylinder;
A fastening member for compressing the protective cylinder holding member;
A fixing member for mounting the fastening member,
With the protection tube holding member pushed into the fixing member, the fastening member is mounted on the fixing member, and the protection tube holding member fixes the protection tube by fastening the fixing member and the fastening member. The end structure of the optical fiber cable according to any one of claims 1 to 3.   The end structure of the optical fiber cable according to claim 1, wherein lead-out lengths of the plurality of optical fiber cords are different from each other.   2. The plurality of derived optical fiber cords are divided into a plurality of sets, and the derived lengths of the optical fiber cords of each set are the same, and the derived lengths of the optical fiber cords for each set are different. The edge part structure of the optical fiber cable of thru | or 4 thru | or 4. A connector is attached to each end, and includes a plurality of optical fiber cords led out from the optical fiber cable to a predetermined lead-out length, and a protective cylinder that stores the plurality of lead-out optical cords. Dividing a plurality of optical fiber cords into a plurality of sets, the derivation lengths of the optical fiber cords of each set are the same, and the derivation lengths of the optical fiber cords for each set are different. A method of manufacturing an end structure of an optical fiber cable having a predetermined diameter when the connectors are bundled,
Attaching a cable fixing portion for holding the optical fiber cable near the end of the optical fiber cable;
Joining a traction member fixing portion having a traction member and a holding member for holding the traction member and the cable fixing portion to both ends of the protective cylinder;
A manufacturing method comprising:

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