JP2018205664A - Fiber optic cable - Google Patents

Abstract

To enable a comparing optical fiber for communication forming a fiber-optic cable to be accurately identified.SOLUTION: One or more pairs of an optical fiber 7 for communication and a plastic optical fiber 8 for wire size identification are juxtaposed as a pair are provided, and an optical fiber cord 2 is formed by integrally coating said fibers in a paired state by extrusion forming. At both ends of the optical fiber 7 for communication are provided an optical connector 3 for connecting the optical fiber 7 for communication to the other side of optical connection, and an optical fiber fixing member 16 is provided, inward of the optical connector 3, on both end side of the optical fiber 7 for communication. The tip of the optical fiber 8 for wire size identification that is paired with the optical fiber 7 for communication is secured to the optical fiber fixing member 16 at a set angle within the range from 90° to approximately 180° with respect to the tip of the optical fiber 7 for communication. Visible light passing through the optical fiber 8 for wire size identification is made to be emitted at the set angle to the optical fiber 7 for communication, for easy visibility to a worker.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an optical fiber cable used for optical communication.

  In recent years, optical communication has become widespread, and a communication carrier and a terminal of a user (optical communication subscriber) such as a home or company are connected by an optical fiber cable and are provided in the optical fiber cable. Optical communication is performed using a communication optical fiber. In a transmission system in optical communication, an optical distribution board is used to form a wiring network provided on the optical communication provider side. For example, as shown in FIG. 12, an optical fiber cord 2 forming an optical fiber cable is an optical fiber. The cord 2 is connected to the optical wiring board 4 via the optical connector 3 provided on the tip side.

  It is necessary to confirm the connection destination of the optical fiber cord 2 to the optical distribution board 4 when adding the optical fiber cord 2, changing the wiring, performing maintenance, etc. For this purpose, connect to the optical distribution board 4. Among the optical fiber cords 2 that are used, it is necessary to identify which optical fiber cord 2 is the optical fiber cord 2 to be subjected to, for example, wiring change or maintenance inspection. However, as the number of optical communication subscribers increases, a large number of optical fiber cords 2 are connected and mounted on the optical distribution board at a high density, and the identification work of the optical fiber cords 2 as described above is not easy. .

  Therefore, for example, in Patent Document 1, an optical fiber cable is formed by providing a communication optical fiber (optical fiber core wire) and a line contrast optical fiber core, and visible light is transmitted from one side of the line contrast optical fiber. For example, as shown in FIG. 13 (a), a visible light incident control member 6 (6a) is provided on one end side of the optical fiber cable 1 so that visible light can be emitted from the other side. It has been proposed to provide a reference member 6 (6b) for emitting visible light on the side.

  The optical fiber cable 1 shown in FIG. 13 is a single-core optical fiber cable formed by one optical fiber cord 2, but the optical fiber cable 1 has a plurality of optical fiber cords 2. Some multi-fiber cables are formed. In general, as shown in FIG. 13, for example, a rubber boot 5 is provided at a connection portion between the optical connector 3 and the optical fiber cord 2.

Japanese Patent No. 5050209 Japanese Patent No. 3363383 JP 2007-226112 A JP2012-068566A

  However, as shown in FIG. 13B, the optical fiber cable 1 is connected to the optical connector 3 with the distal end side of the optical connector 3 inserted into the optical wiring board 4, and the visible light source device is connected to the reference member 6a for visible light incidence. When the visible light is incident and the visible light is emitted from the front end side of the visible light emitting control member 6b, the operator views the visible light from the rear end side of the visible light emitting control member 6b. As a result, there is a problem in that it is difficult for the operator to see the portion irradiated with visible light and it is difficult to identify the target optical fiber cord 2.

  The present invention has been made to solve the above-described problems, and the object thereof is to easily identify optical fibers connected to an optical wiring board in a dense manner by visual inspection without removing an optical connector. It is possible to provide an optical fiber cable that can be easily changed, maintained and inspected.

  In order to achieve the above object, the present invention has the following configuration as means for solving the problems. That is, in the first invention, one or more pairs of a communication optical fiber and a plastic wire number identification optical fiber arranged in parallel with the communication optical fiber along the communication optical fiber are provided. The optical connector for connecting the optical fiber for communication to the optical connection partner side is provided at both ends of the optical fiber for communication, and the optical connector is disposed at both ends of the optical fiber for communication. An optical fiber fixing member is provided on the inner side, and the distal end side of the wire number identification optical fiber that forms a pair of the communication optical fiber is approximately 90 ° to approximately 180 ° with respect to the distal end side of the communication optical fiber. The structure fixed to the optical fiber fixing member at a predetermined set angle within the range is a means for solving the problem.

  According to a second aspect of the invention, in addition to the configuration of the first aspect of the invention, the same number of communication optical fibers and line number identification optical fibers are provided, and the communication optical fiber and the line number identification light are provided. The fiber is bundled in the region excluding both ends of each optical fiber, and the outer peripheral side of the communication optical fiber and the wire number identification optical fiber in the bundled cable region is integrally covered with a covering member. It is characterized by.

  Further, in the third invention, in addition to the configuration of the first or second invention, the pair of communication optical fiber and wire number identification optical fiber are integrally coated by extrusion in a paired state. The distal end of the wire number identifying optical fiber is separated from the communication optical fiber and fixed to an optical fiber fixing member.

  According to the present invention, at least one pair of a communication optical fiber and a plastic wire number identification optical fiber arranged in parallel with the communication optical fiber is provided along the communication optical fiber. Since the optical fiber for connecting the optical fiber for communication to the optical connection partner side is provided at both ends of the optical fiber for communication, for example, the optical connector on one end side is connected to the optical wiring board, An optical connector on the end side is connected to a device on the terminal side on the subscriber side so that the optical communication carrier and the subscriber side can be easily optically connected, and optical communication can be performed through the optical fiber for communication.

  According to the present invention, an optical fiber fixing member is provided on both ends of the optical fiber for communication on the inner side of the arrangement portion of the optical connector, and the wire number identification that forms a pair of the optical fiber for communication Since the distal end side of the optical fiber for communication is fixed to the optical fiber fixing member at a predetermined angle within a range of approximately 90 ° to approximately 180 ° with respect to the distal end side of the communication optical fiber, the communication optical fiber When visible light is passed through the optical fiber for identifying the wire number fixed to the optical fiber fixing member provided on one end of the optical fiber, the wire number fixed to the optical fiber fixing member provided on the other end of the optical fiber for communication Visible light can be emitted from the end (tip) of the identification optical fiber.

  The emitted visible light is emitted at a preset angle within a range of approximately 90 ° to approximately 180 ° with respect to the distal end side of the communication optical fiber, so that the communication optical fibers are in a dense state. Even if the front end side of the optical fiber for communication is connected to the optical distribution board, the operator who performs the wire number identification from the middle side of the optical fiber cable (the rear end side than the side connected to the optical distribution board) The emission state of visible light can be made very easy to see. Therefore, optical fibers that are closely connected to the optical distribution board can be easily and reliably identified visually without removing the optical connector, and optical fiber wiring changes, maintenance inspections, etc. Easy to do.

  Further, in the present invention, the same number of communication optical fibers and wire number identification optical fibers are provided, and the communication optical fiber and the wire number identification optical fiber are bundled in a region excluding both ends of the respective optical fibers. In the case where the outer peripheral side of the communication optical fiber and the wire number identification optical fiber in the bundled cable area is integrally covered with a covering member, an optical fiber cable having very good usability is used. Can be formed. In other words, for example, a plurality of types of bundled cable regions whose outer peripheral sides are integrally covered with a covering member are formed according to the needs of optical communication companies, for example, and are handled as necessary. An optical fiber cable is laid, and an optical fiber cable portion on one end side whose outer peripheral side is not integrally covered with a covering member is connected to an optical distribution board via an optical connector, and the other end side is connected to a terminal side on the subscriber side. An optical transmission system can be easily formed by connecting via an optical connector.

  Further, in the present invention, the pair of communication optical fibers and the wire number identification optical fiber are integrally covered by extrusion molding in a paired state, and the tip side of the wire number identification optical fiber is covered with the communication light. By separating the fiber and fixing it to the optical fiber fixing member, the pair of communication optical fiber and wire number identification optical fiber can be handled very easily.

It is a typical perspective view which shows the optical fiber cable edge part for demonstrating 1st Example of the optical fiber cable which concerns on this invention. It is a typical side view for demonstrating the optical fiber cable of 1st Example. It is typical sectional drawing which shows the cross-sectional structural example of the optical fiber cable of an Example. It is a typical perspective view for demonstrating the optical fiber fixing member applied to the optical fiber cable of 1st Example. It is a typical perspective view for demonstrating the optical fiber fixing member applied to the optical fiber cable of 1st Example. It is a typical side view for demonstrating an example of the plastic optical fiber which forms the optical fiber for wire number identification applied to the Example. In the optical fiber cable of the first embodiment, an example of the state on the light emitting side when the visible light is incident from the optical fiber for identifying the wire number forming one optical fiber cord and the optical fiber code identification operation is performed will be described. It is a schematic diagram for doing. It is a typical perspective view which shows the optical fiber cable edge part for demonstrating 2nd Example of the optical fiber cable which concerns on this invention. It is a typical perspective view for demonstrating the optical fiber fixing member applied to the optical fiber cable of 2nd Example. It is a typical perspective view for demonstrating the optical fiber fixing member applied to the optical fiber cable of 2nd Example. Example of state (a) in which ferrule is connected to optical fiber fixing member applied to optical fiber cable of second embodiment, and emission side when visible light is incident from light incident device connected through the ferrule It is explanatory drawing which shows typically the state example (b) of the optical fiber fixing member of. It is typical explanatory drawing which shows the example of a state which connected the optical fiber cord of the optical fiber cable to the optical distribution board. It is a typical explanatory view for explaining an example of a conventionally proposed optical fiber cable.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the description of the present embodiment, the same reference numerals are assigned to the same name portions as those described so far, and the duplicate description is omitted or simplified.

  FIG. 3B shows a schematic cross-sectional view of the optical fiber cable of the first embodiment. As shown in the figure, in this embodiment, one or more pairs (four pairs in this case) of the optical fiber for communication 7 and the optical fiber for identifying wire number 8 made of plastic are provided, and the optical fiber cable 1 is provided. The paired optical fiber 7 for communication and the optical fiber 8 for identifying a wire number are integrally covered with a covering member 9 having a thickness of, for example, 0.1 mm by extrusion in a paired state. That is, in this embodiment, an optical fiber cord 2 as shown in FIG. 3A is formed by a pair of communication optical fiber 7 and line number identifying optical fiber 8, and the optical fiber cord 2 is As shown in FIG. 3 (b), four optical fiber cables 1 are formed, and the optical fiber cable 1 has the same number of communication optical fibers 7 and wire number identification optical fibers 8 (here, four). Book).

  Further, the line number identifying optical fiber 8 is juxtaposed with the communication optical fiber 7 along the paired communication optical fiber 7 (see also FIG. 1), and as shown in FIG. The optical fiber 7 and the optical fiber 8 for identifying the wire number are bundled in a region 10 except for both ends of the optical fiber cord 2 (both ends of the respective optical fibers 7 and 8). The outer peripheral sides of the communication optical fiber 7 and the wire number identification optical fiber 8 are integrally covered with a covering member 11. In addition, the cable region 10 covered with the covering member 11 is provided with a tension member 12 at the center thereof as shown in FIG. Moreover, the code | symbol 13 shown by FIG. 3 (a), (b) has shown the inner sheath, and the code | symbol 14 of FIG.3 (b) has shown pressing winding.

  The length of the cable region 10 is not particularly limited and may be set as appropriate. For example, cables having various lengths such as 5 m, 10 m, and 100 m are prepared as necessary. It is convenient because it is easy to install the optical fiber cable 1 having the cable region 10 having an appropriate length according to the application.

  FIG. 1 is a schematic perspective view showing an end configuration of an optical fiber cord 2 for explaining the optical fiber cable 1 of the present embodiment together with its assembly process. Although only one end side of the optical fiber cord 2 is shown in FIG. 1, the other end side is similarly configured, and the configurations of the one end side and the other end side of the optical fiber cord 2 are basically mutually different. The same applies (see FIG. 2).

  As shown in FIG. 1, an optical connector 3 for connecting the communication optical fiber 7 to the optical connection partner side is provided at the end (both ends) of the communication optical fiber 7, and for communication. Optical fiber fixing members 16 are provided on both ends of the optical fiber 7 on the inner side of the arrangement portion of the optical connector 3. The optical connector 3 has a built-in ferrule 15 and is formed in an appropriate configuration made of metal, resin, or the like, but since the configuration of the optical connector 3 is well known, detailed description thereof is omitted.

  The most characteristic feature of the present embodiment is that the distal end side of the wire number identifying optical fiber 8 forming the optical fiber cord 2 is separated from the paired communication optical fiber 7 and fixed to the optical fiber fixing member 16 for communication. The tip end side of the wire number identification optical fiber 8 that forms a pair of the optical fiber for communication 7 is set at a predetermined angle (here, approximately 90 ° to about 180 °) with respect to the front end side of the communication optical fiber 7. 180 °) and is fixed to the optical fiber fixing member 16. In this embodiment, the optical fiber fixing member 16 has two fixing members 16a and 16b as shown in FIG. 1, and the optical fiber for communication 7 and the wire number are connected by these fixing members 16a and 16b. The identification optical fiber 8 is sandwiched from both sides.

  A perspective view of the fixing member 16a is shown in FIG. 4 (a), and FIG. 4 (b) shows a diagram through which the interior is seen through. A perspective view of the fixing member 16b is shown in FIG. 5A, and FIG. In FIG. 4B and FIG. 5B, the portion that can be seen through is indicated by a broken line. As shown in FIGS. 1, 4, and 5, the fixing members 16 a and 16 b forming the optical fiber fixing member 16 are formed of a plastic molded body, and the insertion hole 17 of the communication optical fiber 7 and And an insertion hole 18 of the optical fiber 8 for identifying the wire number. In addition, these insertion holes 17 and 18 are formed so that concave portions having a substantially semicircular cross section formed by the fixing members 16a and 16b are aligned to form a hole having a substantially circular cross section. .

  The insertion hole 17 of the communication optical fiber 7 is formed so as to pass straight through the optical fiber fixing member 16. The insertion hole 18 of the optical fiber for identifying the wire number is formed so that its entrance side 19 is close to the entrance side 20 of the insertion hole 17 of the communication optical fiber 7 so as to be substantially parallel to each other. After that, it is formed again in parallel with the entrance side 20 of the insertion hole 17 of the communication optical fiber 7 again. The optical fiber fixing member 16 has an optical connector so that the outlet side 21 of the insertion hole 18 of the line number identification optical fiber 8 protrudes from the inlet side 19 of each insertion hole 18 of the line number identification optical fiber 8. A cylindrical portion 22 that protrudes on the opposite side to 3 is formed.

  In this embodiment, the communication optical fiber 7 is formed of an optical fiber core, and various optical fiber cores can be used as the communication optical fiber 7 in the present invention. The configuration of the optical fiber core wire is well known, but briefly describing the configuration, the outer periphery of the optical fiber (optical fiber strand) formed by covering the outer periphery of the core with a clad is appropriately coated with a primary coating, In this embodiment, the outer diameter of the communication optical fiber 7 is approximately 0.9 mm.

  On the other hand, the wire number identifying optical fiber 8 applied in the present embodiment is a plastic optical fiber formed by covering the periphery of the core 23 with a clad 24 as shown in FIG. Reference numeral 23 denotes a polymethyl methacrylate resin, and the clad 24 is made of a fluororesin. The core 23 has a refractive index of 1.49, a refractive index distribution of a step index type, and an NA (numerical aperture) of 0.5. The diameter of the core 23 is 455 μm or more and 515 μm or less (standard value is 485 μm), the diameter of the clad 24 is 470 μm or more and 530 μm or less (standard value is 500 μm), and the standard weight is 0.2 g / m.

  As described above, the plastic optical fiber forming the wire number identifying optical fiber 8 has a large diameter of the core 23, and therefore, visible light is easily incident thereon. The stiffness value of the number identification optical fiber 8 is not particularly limited and may be set as appropriate. The stiffness of the plastic wire number identification optical fiber 8 applied in this embodiment is used. Is smaller than the rigidity of the communication optical fiber 7, but is close to the rigidity of the communication optical fiber 7 (at least much greater than half the rigidity of the communication optical fiber 7). Note that the rigidity of the wire number identifying optical fiber 8 may be smaller than this value. Further, the thickness of the optical fiber 8 for identifying the wire number is set as appropriate.

  In this embodiment, for example, as shown in FIG. 2, the identification of the wire number fixed to one of the optical fiber fixing members 16 (reference numeral 16C in FIG. 2) provided on one end side of the communication optical fiber 7 is performed. When a visible light incident device (not shown) for identifying a wire number is connected to the end of the optical fiber 8 via a ferrule 27 and visible light is incident from the visible light incident device, the incident visible light is The wire number identifying optical fiber 8 (the wire number identifying optical fiber 8 fixed to the optical fiber fixing member 16C and optically connected to the visible light incident device via the optical ferrule 27) passes through the wire number identifying optical fiber 8. Visible light is emitted from the line number identification optical fiber 8 on the exit side of the optical fiber fixing member 16 (reference numeral 16D in FIG. 2) on which the emission end side of the identification optical fiber 8 is fixed.

  Then, as shown in FIG. 7, an operator who performs line number identification transmits visible light emitted from the output end side of the line number identification optical fiber 8 to the middle side of the optical fiber cord 2 (optical wiring board 4 It can be seen very well from the rear end side than the side connected to. Therefore, the communication optical fiber 7 of the optical fiber cord 2 that is closely connected to the optical wiring board 4 can be easily and reliably identified visually without removing the optical connector 3. It is very easy to change the wiring of the optical fiber 7 and perform maintenance and inspection (such as changing the wiring of the optical fiber cord 2 and performing maintenance and inspection).

  In the present embodiment, the outer diameter of the ferrule 27 and the cylindrical portion 22 can be formed, for example, to 2.5 mm or 1.25 mm, which are currently commonly used ferrule outer diameters. By doing so, the ferrule 27 and the cylindrical part 22 can be easily connected with, for example, a commercially available split sleeve.

  Hereinafter, a second embodiment of the optical fiber cable according to the present invention will be described with reference to FIGS. The optical fiber cable 1 of the second embodiment is configured in substantially the same manner as the first embodiment, and in the description of the second embodiment, the same reference numerals are given to the same name portions as the first embodiment, The duplicate description is omitted or simplified.

  FIG. 8 is a schematic perspective view showing an end configuration of the optical fiber cord 2 for explaining the optical fiber cable 1 of the second embodiment together with its assembly process. Although only one end side of the optical fiber cord 2 is shown in FIG. 8, the other end side is similarly configured, and the configuration on both end sides of the optical fiber cord 2 is basically the same.

  The characteristic configuration of the second embodiment different from that of the first embodiment is that the distal end side of the wire number identification optical fiber 8 that forms a pair of the communication optical fiber 7 is approximately 90 relative to the distal end side of the communication optical fiber 7. Because of this configuration, the second embodiment is provided with an optical fiber fixing member 16 having a mode different from that of the first embodiment. A cable 1 is formed. In the second embodiment, as in the first embodiment, the optical fiber fixing member 16 has two fixing members 16a and 16b. The optical fiber for communication 7 and the optical fiber 7 are connected by these fixing members 16a and 16b. The number identification optical fiber 8 is sandwiched from both sides.

  A perspective view of the fixing member 16a is shown in FIG. 9 (a), and FIG. 9 (b) is a view through which the interior is seen through. Further, a perspective view of the fixing member 16b is shown in FIG. 10 (a), and FIG. 10 (b) shows a diagram through which the inside is seen through.

  In the second embodiment, as in the first embodiment, the fixing members 16a and 16b forming the optical fiber fixing member 16 are formed of a plastic molded body. In the second embodiment, the first member is the first member. The cylindrical portion 22 provided in the embodiment is not formed but is formed on a slope. Further, the insertion hole 18 of the line number identification optical fiber 8 has an inlet side 19 formed in a straight line, bends in an arc shape from the middle portion and extends upward, and the insertion hole 18 of the line number identification optical fiber 8 extends. Is formed on the upper side of the optical fiber fixing member 16. A ferrule insertion hole 26 is formed above the insertion hole 18 of the optical fiber 8 for identifying the wire number.

  The inner diameter of the ferrule insertion hole 26 can be formed to the outer diameter of a ferrule generally used as described above (approximately 2.5 mm or approximately 1.25 mm) corresponding to the outer diameter of the ferrule 27. By doing so, the ferrule 27 can be directly inserted into the ferrule insertion hole 26, and the ferrule 27 can be connected well and easily without rattling.

  In the optical fiber fixing member 16 (fixing members 16a and 16b), a groove portion 25 is formed in a direction crossing the insertion hole 18 of the line number identification optical fiber 8 on the outlet side of the insertion hole 18 of the line number identification optical fiber 8. For example, the groove 25 is formed in parallel with the extending direction of the insertion hole 17 of the communication optical fiber 7. The groove portion 25 is formed as an insertion groove of a blade (for example, a cutter) for cutting an end portion of the plastic wire number identifying optical fiber 8, and the wire number identifying optical fiber 8 is attached to the optical fiber fixing member 16. In the fixed state, the tip of the optical fiber 8 for identifying a wire number can be easily cut by inserting a blade into the groove 25.

  As is well known, the tip end side of the communication optical fiber 7 needs to be polished in order to reduce the optical loss as much as possible, but the end of the wire number identification optical fiber 8 is cut with a blade such as a cutter. There is no problem with optical connection without polishing. That is, as shown in FIG. 6, the plastic optical fiber forming the wire number identification optical fiber 8 has a large diameter of the core 23, so that visible light is likely to enter. Therefore, for example, as shown in FIG. 11 (a), a visible light incident device (not shown) for identifying a wire number is connected via a ferrule 27 and an optical fiber cord (not shown) connected to the ferrule 27. Even in the case where the visible light is incident from the visible light incident device, the optical connection between the optical fiber of the optical fiber cord on the ferrule 27 side and the optical fiber 8 for identifying the wire number can be performed without any trouble.

  Therefore, the optical fiber fixing member 16 is formed in the mode applied to the second embodiment, and the optical cable 1 is easily formed by cutting the tip of the wire number identifying optical fiber 8 with a blade inserted into the groove 25. The wire number can be identified.

  In the second embodiment, the outlet of the insertion hole 18 of the wire number identifying optical fiber 8 formed in the optical fiber fixing member 16 is formed on the upper side of the optical fiber fixing member 16 and becomes a pair of the communication optical fiber 7. Since the distal end side of the wire number identifying optical fiber 8 is fixed to the optical fiber fixing member 16 at a set angle of about 90 ° with respect to the distal end side of the communication optical fiber 7, for example, as shown in FIG. As shown in FIG. 11B, for example, as shown in FIG. 11B, when visible light is incident on the target wire number identification optical fiber 8 via the ferrule 27, the optical fiber cord 2 and Visible light is emitted upward so as to be substantially orthogonal.

  For this reason, in the second embodiment, as in the first embodiment, the operator who performs the wire number identification uses light from the middle side of the optical fiber cable (the rear end side than the side connected to the optical wiring board 4). It can be seen very well from the fiber cord 2 side, and the same effect as the first embodiment can be obtained.

  Note that the present invention is not limited to the above-described embodiments, and can take various forms without departing from the technical scope of the present invention. For example, in the above-described embodiment, four pairs of communication optical fiber 7 and wire number identification optical fiber 8 are provided. However, the number of optical fibers 7 and 8 is not particularly limited and is appropriately set. It is only necessary that the optical fiber cable 1 is formed by arranging the communication optical fiber 7 and the line number identifying optical fiber 8 in parallel and providing one or more pairs.

  In each of the above embodiments, the communication optical fiber 7 and the wire number identification optical fiber 8 are integrally covered with the covering member 9 to form the optical fiber cord 2. The wire number identifying optical fiber 8 is not integrally covered with the covering member 9, but may be individually covered, for example. Further, in the region 10 covered with the covering member 11, the communication optical fiber 7 and the wire number identifying optical fiber 8 are not covered with the covering member, and the communication optical fiber 7 drawn from the covering member 11 and the wire number identifying wire are identified. It is good also as an aspect which covers only the optical fiber 8 with another coating | coated member. In the case where the communication optical fiber 7 and the wire number identification optical fiber 8 are not integrally coated, the optical fiber so that the pair of the communication optical fiber 7 and the wire number identification optical fiber 8 can be understood. When the communication optical fiber 7 and the line number identifying optical fiber 8 are close to each other on at least one end side (for example, the side connected to the optical wiring board 4 and emitting visible light) of 7 and 8. Good.

  Furthermore, the detailed configuration of the optical fiber forming the communication optical fiber 7 is not particularly limited, and may be set as appropriate. For example, a multimode optical fiber or a single mode optical fiber may be used.

  Furthermore, the configuration of the optical fiber fixing member 16 is appropriately set without being limited to the above-described embodiment, and the shape and size thereof are appropriately formed. That is, the front end side of the wire number identifying optical fiber 8 that forms a pair with the communication optical fiber 7 is light at a predetermined set angle within a range of about 90 ° to about 180 ° with respect to the front end side of the communication optical fiber 7. What is necessary is just to be fixed to the fiber fixing member 16. For example, a light scattering cap member may be attached to the light exit end of the optical fiber fixing member 16 provided on the exit side, so that the visible light emission state can be more easily seen. You can also.

  Further, in each of the above embodiments, the wire number identifying optical fiber 8 has a smaller diameter than the communication optical fiber 7, but the wire number identifying optical fiber 8 is equal to the diameter of the communication optical fiber 7 or communication. The diameter may be larger than the diameter of the optical fiber 7 for use. When the diameter of the optical fiber 8 for identifying the wire number is increased, for example, the transmission amount area of the light for identifying the wire number can be increased. It is also possible to identify the optical fiber cable 1 with higher accuracy.

  The optical fiber cable of the present invention can be used as an optical fiber cable for optical transmission in an optical communication system because a communication optical fiber as a reference can be easily and accurately identified.

DESCRIPTION OF SYMBOLS 1 Optical fiber cable 2 Optical fiber cord 3 Optical connector 4 Optical distribution board 7 Optical fiber for communication 8 Optical fiber for wire number identification 9, 11 Cover member 16 Optical fiber fixing member 17, 18 Insertion hole 25 Groove part 26 Ferrule insertion hole

In order to achieve the above object, the present invention has the following configuration as means for solving the problems. That is, in the first invention, one or more pairs of a communication optical fiber and a plastic wire number identification optical fiber arranged in parallel with the communication optical fiber along the communication optical fiber are provided. The optical connector for connecting the optical fiber for communication to the optical connection partner side is provided at both ends of the optical fiber for communication, and the optical connector is disposed at both ends of the optical fiber for communication. An optical fiber fixing member is provided inside the optical fiber fixing member . The optical fiber fixing member has a straight communication optical fiber insertion hole through which the communication optical fiber passes straight, and the wire number identifying light. After the fiber advances in parallel with the insertion hole of the communication optical fiber, it bends upward in an arc shape, and the distal end side of the wire number identification optical fiber that forms a pair of the communication optical fiber is connected to the communication optical fiber. Ahead And the insertion hole of the line number identification optical fiber which is inserted in a manner to wrap at a predetermined is set angle in a range of approximately 90 ° ~ approximately 180 ° provided to the side, wherein the front end side of the communication optical fiber wherein It is fixed to the optical fiber fixing member in a state of being inserted into the insertion hole of the communication optical fiber, and the tip side of the optical fiber for identifying the wire number is inserted into the insertion hole of the optical fiber for identifying the wire number The structure fixed to the optical fiber fixing member serves as means for solving the problem.

According to a second aspect of the invention, in addition to the configuration of the first aspect of the invention, the insertion hole of the optical fiber for identifying a wire number has an arc shape at the distal end side of the optical fiber for identifying a wire number inserted through the insertion hole. An insertion hole that is bent upward and is directed upward at an angle of approximately 90 ° with respect to the distal end side of the communication optical fiber. The optical fiber fixing member has an upward insertion hole for the optical fiber for identifying a wire number. A groove portion is formed in a direction crossing the insertion hole of the optical fiber for identifying the wire number at the exit side portion, and the wire number inserted into the insertion hole of the optical fiber for identifying the wire number by inserting a blade into the groove portion The tip end side of the upward portion of the optical fiber for identification can be cut with the blade. In addition to the configuration of the first or second invention, the third invention is provided with an equal number of the communication optical fibers and the wire number identification optical fibers, and the communication optical fiber and the wire number identification The optical fibers are bundled in regions except for both ends of each optical fiber, and the outer peripheral sides of the communication optical fiber and the wire number identification optical fiber in the bundled cable region are integrally covered with a covering member. It is characterized by that.

Further, in the fourth invention, in addition to the configuration of the first, second, or third invention, the pair of communication optical fiber and the wire number identification optical fiber are integrally formed by extrusion in a paired state. The distal end side of the wire number identification optical fiber is separated from the communication optical fiber and fixed to an optical fiber fixing member.

Claims (3)

  One or more pairs of a communication optical fiber and a plastic wire number identification optical fiber arranged in parallel with the communication optical fiber along the communication optical fiber are provided as a pair, and both ends of the communication optical fiber The optical connector for connecting the optical fiber for communication to the optical connection partner side is provided in the part, and an optical fiber fixing member is provided on both ends of the optical fiber for communication on the inner side of the arrangement part of the optical connector. And a predetermined set angle within a range of approximately 90 ° to approximately 180 ° with respect to the distal end side of the communication optical fiber. The optical fiber cable is fixed to the optical fiber fixing member.   An equal number of communication optical fibers and line number identification optical fibers are provided, and the communication optical fiber and the line number identification optical fiber are bundled by bundling regions except for both ends of the respective optical fibers. 2. The optical fiber cable according to claim 1, wherein an outer peripheral side of the communication optical fiber and the wire number identification optical fiber in the cable region is integrally covered with a covering member.   The paired communication optical fiber and the wire number identifying optical fiber are integrally coated by extrusion in a paired state, and the tip end side of the wire number identifying optical fiber is separated from the communication optical fiber. The optical fiber cable according to claim 1, wherein the optical fiber cable is fixed to an optical fiber fixing member.

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