JP2010060724A - Optical fiber cable and information wiring system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a flexible and thin optical fiber cable storing an optical fiber core with only a tension member without generating twisting and without jointly using a spacer and the tension member by arranging the optical fiber core in a space formed by a plurality of the tension members in a cable sheath. <P>SOLUTION: The optical fiber cable includes: the plurality of the tension members 2; the optical fiber core 3 arranged in the space formed by the plurality of the tension members 2; a cable sheath 4 coated on the circumference of the tension members 2 and the optical fiber core 3. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an optical fiber cable used for optical wiring for information communication using optical fibers in buildings and homes, and an information wiring system using the optical fiber cables.

  Conventionally, in information communication in buildings such as condominiums, information communication using optical fiber wired from the telephone office is converted to electrical signals using media converters etc. on the main switchboard in the building, VDSL format (for example, see Non-Patent Document 1) that uses a metallic line already wired in a building to communicate information to each subscriber's house has been widely used. In response to this, it has been practiced to directly route optical fiber cables instead of metallic wires for information communication in buildings.

  Especially for vertical wiring in buildings, in order to directly route optical fiber cables, mainly SM (Single Mode Fiber) type indoor optical fiber cables (for example, see Patent Document 1) and SM type indoor optical cables ( For example, see Patent Document 2).

Japanese Utility Model Publication No. 5-30817 JP 2003-161867 A JP-A-8-184728 JP-A-6-148464 Hiromichi Shinohara “[New Edition] Easy Fiber Optic Communication” published by Ohmsha, Ltd. November 1, 2006 p. 242-243

  At present, vertical pipes used for wiring optical fiber cables in buildings have various inner diameters. Small pipes with a diameter of 14 mm exist, and even pipes with a large diameter of 50 mm already have some Since the cables are wired, there are always great restrictions on the wiring of the optical fiber cable in the vertical piping such as excess space in the piping.

  In addition, since the shape of the building is various and vertical piping is installed, the piping itself may be meandered and installed in the building. For example, in the SM type optical fiber cable, the slot rod and tension Since the member is hard and the outer diameter of the cable is large, there is a problem in that it lacks flexibility and does not pass through the pipe due to excessive space or meandering in the pipe during wiring.

  On the other hand, since the SM type indoor optical cable has a smaller diameter than the SM type indoor optical fiber cable, the problem of the extra space due to the diameter of the vertical piping and the already wired cables is the same as that of the SM type indoor optical fiber cable. Compared to the rectangular shape, twisting occurs when wiring in the piping, and the optical fiber inside the optical fiber cable may be broken. Attention is required.

  For this reason, in the above-described optical fiber cable currently used, a specific technique such as certain experience and knowledge is required for the wiring work in the vertical piping.

  These existing optical fiber cables are mainly used to remove the outer sheath of the existing optical fiber cables from the main switchboard and the intermediate switchboards on each floor, and to perform extra length processing and connection work for the optical fiber cores taken out from the inside. A cabinet is installed inside the switchboard and the intermediate switchboard on each floor, the optical fiber core taken out from the optical fiber cable is stored in the cabinet, and the main switchboard and the intermediate switchboard on each floor are used to communicate information to subscribers on each floor. Since it is necessary to connect optical fiber cables that have been routed to subscriber's homes through horizontal piping by means of connection methods such as mechanical splices, optical connectors, and fusion processing, a certain amount of experience and knowledge regarding these connection operations is required. Such a specific technique is required.

  For this reason, only the workers with these specific technologies can perform the wiring work of the optical fiber cable in the building, and even when it is performed, there is a problem that a lot of work time is required. Yes.

  In addition, since the existing two optical fiber cables are used in accordance with the building, the information wiring means in the building is not constant, and therefore the information wiring system of the building varies from building to building. As a result, it becomes increasingly necessary to rely on workers with specific technologies, which hinders the construction of an information wiring system for an advanced information society.

  The present invention has been made in view of the above circumstances, and by disposing an optical fiber in a space provided by a plurality of tension members in a cable jacket, without using a spacer and a tension member in combination, An object of the present invention is to provide an optical fiber cable that can accommodate an optical fiber with only a tension member, is flexible, has a small diameter, and does not generate twist.

  In addition, the present invention relates to a vertical pipe diameter in a building, a problem of excess space due to existing cables wired to the pipe, a shape of a pipe such as meandering and a problem of optical fiber cable wiring due to obstacles, to a customer's house on each floor. Various problems such as connection work to connect optical fiber cables wired from main switchboards and intermediate switchboards on each floor to subscriber's homes through horizontal piping for information communication using connection methods such as mechanical splices, optical connectors, and fusion It is possible to eliminate work that requires specific points and specific technologies, enabling workers other than those who have specific technologies to wire optical fiber cables in buildings, reducing work time, and specifying It is an object of the present invention to provide an information wiring system that can be easily constructed even by an operator who does not have this technology.

  In order to achieve the above object, an optical fiber cable of the present invention includes a plurality of tension members, an optical fiber strand disposed in a space provided by the plurality of tension members, and the tension member and the optical fiber strand. And a cable jacket covering the periphery of the cable.

  According to the present invention, in the optical fiber cable, the tension members are each twisted in a spiral shape.

  According to the present invention, in the optical fiber cable, an uneven portion is provided on a surface of the cable jacket.

  According to the present invention, in the optical fiber cable, a silicone resin, a polyethylene resin, or an aramid resin is filled between the tension member, the optical fiber, and the cable jacket.

  According to the present invention, in the optical fiber cable, optical connectors are provided at both ends or one end of the optical fiber cable.

  Further, the present invention is an information wiring system for wiring the optical fiber cable to a switchboard on a predetermined floor through a vertical pipe of a building, and the optical fiber cable is wired to the switchboard and arranged on the switchboard. The optical connector on the splitter module side or the optical connector on the cabinet side is connected to the optical connector of the optical fiber cable via an adapter.

  The optical fiber cable of the present invention is provided with a plurality of tension members in the interior thereof, the optical fiber strands are disposed in a space provided by the plurality of tension members, and the periphery thereof is covered with a cable jacket, Without using a spacer and a tension member together as in the case of an optical fiber cable, it becomes possible to store an optical fiber with only a tension member, and to provide an optical fiber cable that is flexible and has a small diameter and does not generate twist. I can do it.

  In addition, the information wiring system of the present invention includes optical connectors at both ends or one end of the optical fiber cable, so that the optical fiber cable can be wired into the vertical piping in the building, the main switchboard, and the intermediate switchboard on each floor. Since it is possible to work without using a work having a specific technology such as a connection work, it is possible for a worker other than a worker having a specific technique to perform the same work. Compared to the construction of an information wiring system using optical fiber cables in a building, the work time can be shortened, and the construction of an information wiring system in any building becomes a certain means. An information wiring system using an optical fiber cable can be easily constructed.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a sectional view showing an optical fiber cable according to a first embodiment of the present invention.
In FIG. 1, 1 is an optical fiber cable, 2 is a tension member, 3 is an optical fiber, and 4 is a cable jacket.

  As shown in FIG. 1, three tension members 2 having a circular cross section are arranged in a spiral shape inside the optical fiber cable 1, and the inside of the space provided by the three tension members 2 is arranged. The optical fiber 3 is disposed on the side. A cable jacket 4 is covered around the tension member 2 and the optical fiber 3.

FIG. 2 is a sectional view showing an optical fiber cable according to the second embodiment of the present invention.
As shown in FIG. 2, four tension members 2 having a circular cross section are arranged in a spiral shape inside the optical fiber cable 1, and the inside of the space provided by the four tension members 2 is arranged. The optical fiber 3 is disposed on the side. A cable jacket 4 is covered around the tension member 2 and the optical fiber 3.

  That is, the number of tension members 2 provided inside the optical fiber cable 1 is different. By increasing the number of tension members 2, the size of the space provided by the tension members 2 can be changed.

FIG. 3 is a sectional view showing an optical fiber cable according to the third embodiment of the present invention.
As shown in FIG. 3, four tension members 2 having a circular cross section are arranged in a spiral shape inside the optical fiber cable 1, and the inside of the space provided by the four tension members 2 is arranged. The optical fiber 3 is disposed on the side. A cable jacket 4 is covered around the tension member 2 and the optical fiber 3.

  That is, the number of tension members 2 provided in the optical fiber cable 1 is the same as four, but not only the space provided between the four tension members 2 but also the tension member 2 and the cable jacket. The optical fiber 3 is also provided in the space provided between the four.

  The optical fiber cable 1 having the structure shown in FIG. 1 to FIG. 3 can change the size of the space provided between the tension members 2 by changing the diameter and number of the tension members 2. The size of the space provided between the tension member 2 and the cable jacket 4 can be changed.

FIG. 4 is a sectional view showing an optical fiber cable according to the fourth embodiment of the present invention.
In FIG. 4, 5 is a filler.

  As shown in FIG. 4, three tension members 2 having a circular cross section are arranged in a spiral shape inside the optical fiber cable 1, and the space provided by the three tension members 2 is arranged. The optical fiber 3 is disposed on the side. A cable jacket 4 is covered around the tension member 2 and the optical fiber 3, and the tension member 2, the optical fiber 3, and the cable jacket 4 in the cable jacket 4 are, for example, silicon. Filler 5 such as resin, polyethylene resin, or aramid resin is enclosed.

  That is, by filling the filler 5 with a fibrous material such as reinforced glass fiber (FRP) such as Kevlar, the impact from the outside can be absorbed and the tensile strength obtained by the tension member 2 can be increased. it can. Further, the tension member 2 and the optical fiber strand 3 can be fixed by filling the filler 5 with a flexible resin such as a silicone resin, so that it is possible to prevent a deviation or the like when the optical fiber cable 1 is bent. It is.

  The optical fiber cable 1 is bent at a minimum bending radius R = 5 mm or more when a hole assist fiber or a high delta type SM fiber is used for the optical fiber 3 and a reinforced glass fiber (FRP) is used for the tension member 2. It is possible. In addition, if the filler 5 uses a silicon resin, for example, a silicon resin such as silicon rubber, or a flexible resin such as a fluororesin, for example, Teflon (registered trademark) or a urethane resin, it can be used for an existing optical fiber cable. Compared with polyethylene (Young's modulus: 0.4 to 1.3 GPa), polyolefin (Young's modulus: about 370 GPa), PVC (polyvinyl chloride) (Young's modulus: 2.4 to 3.4 GPa) Yes, as with the tension member 2, it is possible to bend at a minimum bending radius R = 5 mm or more.

  Here, when a steel wire, for example, a hard steel wire (SW-C, Young's modulus: 20.1 to 21.6 GPa) is used for the tension member 2, the minimum bending radius is increased, but the strength of the optical fiber cable 1 is improved. It becomes possible. Further, if a reinforcing glass fiber such as Kevlar (polyparaphenylene terephthalamide) or PBO (polyparaphenylene benzoxazole) is used for the filler 5, the tensile strength of the filler 5 itself is improved. The tensile strength of the fiber cable 1 can be improved. Even if the tension member 2 is thinned, the tensile strength can be maintained, and the diameter of the optical fiber cable 1 can be reduced.

  By using the tension member 2 or the tension member 2 and the filler 5 in combination, a tensile strength of 200 N or more can be obtained, and a sufficient tensile strength for wiring to a building can be obtained.

  Further, by using a silicon resin, for example, a silicon resin such as silicon rubber, or a fluororesin, for example, Teflon (registered trademark) or a urethane resin, for the cable jacket 4, it becomes possible to keep the coefficient of dynamic friction low. It is possible to smoothly wire the inside of the pipe.

  Further, by providing optical connectors at both ends or one end of the optical fiber cable 1, connection work can be facilitated.

FIG. 5 is a sectional view showing an optical fiber cable according to a fifth embodiment of the present invention.
As illustrated in FIG. 5, four tension members 2 having a substantially rectangular cross section are arranged in a rectangular cross section inside the optical fiber cable 1. In this case, the ridge line portion on the central portion side of each tension member 2 is formed in an arcuate shape so that a space is formed in the axial direction in the central portion of the four tension members 2 assembled. An optical fiber 3 is disposed in the space provided by the four tension members 2. A cable jacket 4 is covered around the tension member 2 and the optical fiber 3.

  That is, by deforming a part of the tension member 2 provided in the optical fiber cable 1, a space provided by combining a plurality of tension members 2 can be efficiently obtained without increasing the diameter and number of the tension members 2. Can be provided. In this case, a space can be provided even if it is not circular.

FIG. 6 is a sectional view showing an optical fiber cable according to a sixth embodiment of the present invention.
As shown in FIG. 6, two substantially quadrangular tension members 201 and 202 and one quadrangular tension member 203 are collectively arranged inside the optical fiber cable 1. In this case, the two tension members 201 and 202 are arranged in parallel, and one tension member 203 is placed so as to be placed on the adjacent portion of the two tension members 201 and 202 arranged in parallel. Is placed. In the two tension members 201 and 202, the ridge line portion on the tension member 203 side is recessed in an arc shape in the adjacent portion of the tension members 201 and 202 so that a space is formed in the axial direction on the tension member 203 side of the adjacent portion. Formed with. An optical fiber 3 is disposed in a space provided by the three tension members 201, 202, 203. A cable jacket 4 is covered around the tension members 201, 202, 203 and the optical fiber 3.

  That is, in the case where a member obtained by deforming part of the tension members 201 and 202 is used, a space can be provided in combination with a member that does not deform the tension member 203, and a space can be created with a smaller number of tension members. it can.

  FIG. 7 is an external view showing the configuration of the cable jacket of the optical fiber cable according to the embodiment of the present invention. In FIG. 7, 6 is an uneven part.

  As shown in FIG. 7, as a method of reducing the dynamic frictional force of the cable jacket 4 of the optical fiber cable 1, an elliptical uneven portion 6 is provided on the surface of the cable jacket 4 to reduce the contact area with the inner wall of the pipe. Therefore, it is possible to reduce the dynamic friction force. In this way, by reducing the dynamic frictional force of the cable jacket 4, the optical fiber cable 1 can be easily wired to the vertical piping of the multi-storey building.

  FIG. 8 is an explanatory diagram comparing an optical fiber cable according to an embodiment of the present invention with a conventional optical fiber cable. That is, experimental data when two types of optical fiber cables are routed through a 16 mm diameter CD tube one by one, and when the optical fiber cable of the present invention is routed with an outer diameter of 2 mm. It is each experimental data when the existing indoor cable (cross-sectional rectangle: 2.1 mm in length x 3.4 mm in width) is wired.

  FIG. 9 is a configuration explanatory view showing a first example of the information wiring system according to the embodiment of the present invention, which is an example in which a splitter module is arranged in an intermediate switchboard (IDF). In FIG. 9, 7 is a building, 8 is a single-core optical connector, 9 is an adapter, 10 is a splitter module, 11 is a branching section, 12 is a vertical pipe, 13 is a main switchboard (MDF), 14 is a multi-core optical connector, Reference numeral 15 denotes an intermediate distribution board (IDF), 16 denotes a horizontal wiring optical fiber cable, 17 denotes a horizontal piping, and 18 denotes a single-core optical connector.

  As shown in FIG. 9, the optical fiber cable 1 of the present invention is wired through the vertical piping 12 from the intermediate switchboard (IDF) 15 on the fourth floor of the building 7 to the main switchboard (MDF) 13 on the first floor. At this time, the end of the optical fiber cable 1 on the main switchboard (MDF) 13 side is provided with a multi-core optical connector 14 such as an MPO (Multifibre-Push-On) connector, for example, from the fourth floor to the vertical piping 12. It is possible to easily perform the line. An optical fiber cable such as a drop cable provided with a multicore optical connector is directly connected to the multicore optical connector 14. Further, by providing an MT connector (Mechanically Transferable Splicing Connector) (see, for example, Patent Document 3) instead of the MPO connector as the multi-core optical connector 14, wiring can be performed even in a narrow pipe.

  At the end of the optical fiber cable 1 on the fourth-floor intermediate switchboard (IDF) 15 side, a single core is formed according to the number of optical fiber strands housed in the optical fiber cable 1 through the branch part 11 with the optical fiber cable 1. By providing the optical connector 8, it is possible to directly connect to the splitter module 10 including the single-core optical connector 18 via the adapter 9 (see, for example, Patent Document 4), such as a fusion process or a mechanical splice process. Since the processing can be omitted, the connection work of the horizontal piping 17 with the horizontal wiring optical fiber cable 16 can be facilitated.

  FIG. 10 is a configuration explanatory view showing a second example of the information wiring system according to the embodiment of the present invention, in which a splitter module is arranged in the main switchboard (MDF). In FIG. 10, 19 is a splitter module, 20 is a single-core optical connector, 21 is an adapter, and 22 is a multi-core / single-core conversion adapter.

  As shown in FIG. 10, the optical fiber cable 1 of the present invention is wired through the vertical piping 12 from the intermediate distribution board (IDF) 15 on the fourth floor of the building 7 to the main distribution board (MDF) 13 on the first floor. At this time, for example, a multi-core optical connector 14 such as an MPO connector is provided at the end of the optical fiber cable 1 on the main switchboard (MDF) 13 side so that the passage from the fourth floor to the vertical piping 12 can be easily performed. Can do. Further, by providing an MT connector (see, for example, Patent Document 3) as the multi-core optical connector 14 instead of the MPO connector, wiring can be performed even in a narrow pipe. A splitter module 19 having a single-core optical connector 20 can be connected to the multi-core optical connector 14 via a multi-core / single-core conversion adapter 22 and an adapter 21.

  At the end of the optical fiber cable 1 on the fourth-floor intermediate switchboard (IDF) 15 side, a single core is formed according to the number of optical fiber strands housed in the optical fiber cable 1 through the branch part 11 with the optical fiber cable 1. By providing the optical connector 8, it can be directly connected to the horizontal wiring optical fiber cable 16 including the cabinet-side single-core optical connector 18 disposed in the intermediate switchboard (IDF) 15 through the adapter 9. Since connection processing such as fusion processing and mechanical splicing processing can be omitted, the connection work of the horizontal piping 17 with the horizontal wiring optical fiber cable 16 can be facilitated.

  FIG. 11 is a configuration explanatory view showing a third example of the information wiring system according to the embodiment of the present invention, in which a splitter module is not arranged in the main switchboard (MDF) and the intermediate switchboard (IDF). In FIG. 11, reference numeral 23 denotes a pigtail code.

  As shown in FIG. 11, the optical fiber cable 1 of the present invention is wired through the vertical piping 12 from the intermediate switchboard (IDF) 15 on the fourth floor of the building 7 to the main switchboard (MDF) 13 on the first floor. At this time, for example, a multi-core optical connector 14 such as an MPO connector is provided at the end of the optical fiber cable 1 on the main switchboard (MDF) 13 side so that the passage from the fourth floor to the vertical piping 12 can be easily performed. Can do. Further, by providing an MT connector (see, for example, Patent Document 3) as the multi-core optical connector 14 instead of the MPO connector, wiring can be performed even in a narrow pipe. The multi-core optical connector 14 can be connected to a pigtail cord 23 having a single-core optical connector 20 via a multi-core / single-core conversion adapter 22 and an adapter 21.

  At the end of the optical fiber cable 1 on the fourth-floor intermediate switchboard (IDF) 15 side, a single core is formed according to the number of optical fiber strands housed in the optical fiber cable 1 through the branch part 11 with the optical fiber cable 1. By providing the optical connector 8, it can be directly connected to the horizontal wiring optical fiber cable 16 including the cabinet-side single-core optical connector 18 disposed in the intermediate switchboard (IDF) 15 through the adapter 9. Since connection processing such as fusion processing and mechanical splicing processing can be omitted, the connection work of the horizontal piping 17 with the horizontal wiring optical fiber cable 16 can be facilitated.

  FIG. 12 is a configuration explanatory view showing a fourth example of the information wiring system according to the embodiment of the present invention, which is an example in which splitter modules are arranged in both the main switchboard (MDF) and the intermediate switchboard (IDF).

  As shown in FIG. 12, the optical fiber cable 1 of the present invention is wired from an intermediate distribution board (IDF) 15 on the fourth floor of a building 7 to a main distribution board (MDF) 13 on the first floor through vertical piping 12. At this time, for example, a multi-core optical connector 14 such as an MPO connector is provided at the end of the optical fiber cable 1 on the main switchboard (MDF) 13 side so that the passage from the fourth floor to the vertical piping 12 can be easily performed. Can do. Further, by providing an MT connector (see, for example, Patent Document 3) as the multi-core optical connector 14 instead of the MPO connector, wiring can be performed even in a narrow pipe. A splitter module 19 having a single-core optical connector 20 can be connected to the multi-core optical connector 14 via a multi-core / single-core conversion adapter 22 and an adapter 21.

  At the end of the optical fiber cable 1 on the fourth-floor intermediate switchboard (IDF) 15 side, a single core is formed according to the number of optical fiber strands housed in the optical fiber cable 1 through the branch part 11 with the optical fiber cable 1. By providing the optical connector 8, it is possible to directly connect to the splitter module 10 including the single-core optical connector 18 via the adapter 9 (see, for example, Patent Document 4), such as a fusion process or a mechanical splice process. Since the processing can be omitted, the connection work of the horizontal piping 17 with the horizontal wiring optical fiber cable 16 can be facilitated.

  Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. Further, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, you may combine suitably the component covering different embodiment.

It is sectional drawing which shows the optical fiber cable which concerns on the 1st Embodiment of this invention. It is sectional drawing which shows the optical fiber cable which concerns on the 2nd Embodiment of this invention. It is sectional drawing which shows the optical fiber cable which concerns on the 3rd Embodiment of this invention. It is sectional drawing which shows the optical fiber cable which concerns on the 4th Embodiment of this invention. It is sectional drawing which shows the optical fiber cable which concerns on the 5th Embodiment of this invention. It is sectional drawing which shows the optical fiber cable which concerns on the 6th Embodiment of this invention. It is the external view which showed the structure of the cable jacket of the optical fiber cable which concerns on embodiment of this invention. It is explanatory drawing which compared the optical fiber cable which concerns on embodiment of this invention with the conventional optical fiber cable. 1 is a configuration explanatory diagram illustrating a first example of an information wiring system according to an embodiment of the present invention. FIG. It is composition explanatory drawing which shows the 2nd example of the information wiring system which concerns on embodiment of this invention. It is composition explanatory drawing which shows the 3rd example of the information wiring system which concerns on embodiment of this invention. It is composition explanatory drawing which shows the 4th example of the information wiring system which concerns on embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Optical fiber cable, 2 ... Tension member, 3 ... Optical fiber strand, 4 ... Cable jacket, 5 ... Filler, 6 ... Uneven part, 7 ... Building, 8 ... Single-core optical connector, 9 ... Adapter, 10 ... Splitter module, 11 ... Branch, 12 ... Vertical piping, 13 ... Main switchboard (MDF), 14 ... Multi-core optical connector, 15 ... Intermediate switchboard (IDF), 16 ... Horizontal wiring optical fiber cable, 17 ... Horizontal System piping, 18 ... single-core optical connector, 19 ... splitter module, 20 ... single-core optical connector, 21 ... adapter, 22 ... multi-core / single-core conversion adapter, 23 ... pigtail cord.

Claims (6)

Multiple tension members,
An optical fiber disposed in a space provided by the plurality of tension members;
An optical fiber cable comprising a cable jacket covering the tension member and an optical fiber strand.   The optical fiber cable according to claim 1, wherein each of the tension members is twisted in a spiral shape.   The optical fiber cable according to claim 1, wherein an uneven portion is provided on a surface of the cable jacket.   4. The optical fiber cable according to claim 1, wherein a silicone resin, a polyethylene resin, or an aramid resin is filled between the tension member, the optical fiber, and the cable jacket.   The optical fiber cable according to any one of claims 1 to 4, wherein optical connectors are provided at both ends or one end of the optical fiber cable.   An information wiring system for wiring the optical fiber cable according to claim 5 to a distribution board on a predetermined floor through a vertical pipe of a building, wherein the optical fiber cable is wired to the distribution board, and is arranged on the distribution board. A splitter module side optical connector or cabinet side optical connector and an optical connector of the optical fiber cable are connected via an adapter.

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