JP2008129169A - Optical fiber cable - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical fiber cable having a branched part structure that reduces completion time and facilitates a construction without requiring a skilled worker. <P>SOLUTION: A molded unit is provided in the longitudinal direction of an optical fiber cable extended in the longitudinal direction, the molded unit formed by wiring and molding an optical wiring line branched from the optical fiber cable and formed into an elongated dimension which is one to three times of the optical cable optical fiber in a width size. One optical connector attached to the tip of the drop cable, and the other optical connector to which the optical wiring line is directly connected are disposed so as to be connectable to the outer face of a branch part. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an optical fiber cable having a branching portion for dropping to a drop cable.

  In recent years, with the spread of the Internet, optical broadband services using optical fibers have been rapidly introduced. Furthermore, due to the spread of FTTH, the need to newly branch or drop the optical fiber after laying the optical fiber cable is likely to increase.

  In Patent Document 3, a required number of lead-out cables with connectors attached to the ends thereof are drawn from a closure main body attached to a trunk cable so that the connector is located outside the closure main body, and each lead-out cable is pulled out within the closure main body. The cable and the optical fiber core of the trunk cable are connected, and the closure body is sealed in this state, and a waterproof cover is put on the connector at the tip of the lead-out cable. The drop cable can be connected without opening the closure body by removing the cover and coupling the connector attached to the base end of the drop cable to the connector at the tip of the drawer cable. A drop cable connection closure is described.

  Regarding the branching portion used when the optical fiber core wire is pulled down in the middle of the optical fiber cable wiring section, techniques shown in Patent Document 1 and Patent Document 2 have been proposed.

JP-A-8-240723 Japanese Patent Laid-Open No. 9-15430 JP 2003-202427 A

  In the conventional optical fiber wiring method, when it becomes necessary to branch an optical fiber after laying the optical fiber cable, a closure or the like is placed at a predetermined portion of the aerial cable stretched between utility poles to branch or Connected to a cable for withdrawal. For this reason, in the current wiring method, it is necessary to perform the installation work of the closure by skilled workers. Therefore, each time a branch or withdrawal request is made, a skilled worker and work schedule are required. Moreover, it is necessary to purchase a member such as a closure necessary for the construction. Even in the technique described in the above-mentioned patent document, it is required to perform installation work similar to the conventional method. An object of this invention is to provide an optical fiber cable provided with the branch part structure which shortens a construction period in view of this point, and can perform construction simply without requiring a skilled worker.

The present invention is an optical fiber cable having a branching part for dropping to a drop cable,
An optical fiber cable extending in the longitudinal direction is provided in a cable shape in the longitudinal direction, and an optical wiring branched from the optical fiber cable is formed integrally with the fiber cable, and a lead-out portion for leading out the optical connector is provided. An optical fiber cable comprising an elongated mold part is provided.

This optical fiber cable is characterized in that the mold part has an elongated dimension in which the diameter or the dimension of the longest cross section is within 1 to 5 times the thickness of the optical fiber cable.
This optical fiber cable is characterized in that the mold part has an elongated dimension in which the diameter or the dimension of the longest cross section is 1 to 3 or 1 to 4 times or more the thickness of the dimension of the optical fiber cable.
This optical fiber cable is characterized in that the mold part includes a plurality of lead-out parts along the longitudinal direction.

The present invention is an optical fiber cable having a branching part for dropping to a drop cable,
The optical fiber cable extending in the longitudinal direction is provided with a first mold portion that is formed in a cable shape in the longitudinal direction and an optical wiring branched from the optical fiber cable and molded integrally with the optical fiber cable. A second elongated mold portion having a lead-out portion for introducing an optical connector; the second mold portion includes an optical wiring connected to the lead-out portion; and the first mold portion connected to the optical connector. An optical fiber cable is provided that is formed as a longitudinal cable-like cassette module that can be removed from a mold part.

In this optical fiber cable, the branch module includes one input port branched from the optical fiber cable and a single output port that forms a lead-out portion to be pulled down to the drop cable.
The optical fiber cable is characterized in that the second module section includes a plurality of output ports along the longitudinal direction.
This optical fiber cable is replaced by another cassette module equipped with a downstream feed connecting portion for connecting the upstream optical fiber cable to the downstream fiber cable when the cassette module is removed from the second module portion. The optical fiber cable is characterized in that the cassette module is configured by a jumper cord.

  The present invention provides an elongated optical fiber cable having a lead-out portion that is formed in a cable shape in the longitudinal direction of the optical fiber cable that extends in the longitudinal direction and is molded by wiring an optical wiring branched from the optical fiber cable. Therefore, it is possible to provide an optical fiber cable that is easy to handle, shortens a branching construction period, and can be easily constructed without requiring a skilled worker.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 shows a schematic configuration of a first embodiment of the present invention. FIG. 1 (a) is an optical connector fixing type, and FIG. 1 (b) is an optical connector separation type. FIG. 2 is an example showing the fiber cable shown in FIG. 1 in more detail, and FIG. 3 shows an XX cross section of FIG. In these drawings, reference numeral 1 denotes an aerial optical fiber cable, in which a multi-fiber optical fiber 31 is housed. Hereinafter, the aerial fiber cable is referred to as an optical fiber cable, and when referring to an individual optical fiber cable, it is referred to as a single optical fiber cable 1. The optical fiber cable 1 accommodates an optical fiber core wire 31 in a tube 32 and includes tensile strength members 33 at upper and lower ends. In the mold portion 3, the drop cable 4 is composed of a branched wiring (optical fiber core wire) 41, a strength member 42 and a coating 43. The optical fiber cable 1 is supported by a support line 2 and is disposed between aerial, for example, utility poles. Such a configuration is well known. The optical fiber cable 1 includes a mold part 3 for dropping, is formed by a drop cable in the mold part 3, and is connected to an external drop cable 4 through a lead-out part (lead-out part drop cable). . The optical fiber cable 1 is molded and includes a support portion 8 that supports the optical fiber cable 1 on the support wire 2.

  In FIG. 1A, the length of the optical fiber cable 1 extending in the longitudinal direction is within 1 to 3 times (3L) (preferably 1 to 2.5 times) of the thickness dimension (L) of the optical fiber cable 1 in the longitudinal direction. A mold part 3 having an elongated dimension is provided. FIG. 3 shows an example in which the dimensions of the mold part 3 are within 4 times the outer diameter L of the optical fiber cable 1. The mold part 3 is provided between the upstream optical fiber cable 1A and the downstream optical fiber cable 1B and along the longitudinal direction of the aerial optical fiber cable 1, and forms a cable shape. The cable shape is used in the sense that it has a shape like a cable and is elongated like a cable, but it is used in the sense that it is not a box shape.

  The mold unit 3 molds, i.e., covers, the drop cable 4 provided with the branched wiring 41 with a resin, and the drop cable 4 provided with the wiring branched from the optical fiber core wire 31 is closely fixed, as described above. The optical fiber cable 1 is molded integrally with the optical fiber as a molded body having an elongated dimension within 1 to 3 or 1 to 4 times the thickness of the optical fiber cable 1. In the case of this example, the front end and the rear end are circular like the optical fiber cable 1. The center part of the mold part 3 may not be circular, but may be square, rectangular or elliptical. In the case of the example shown in FIG. 3, a long rectangular cross-sectional shape is formed below. Therefore, the above 1 to 3 or 1 to 4 times refers to the diameter dimension in the case of a circular shape, and the longest section dimension in the case of other shapes. Hereinafter, the case of a rectangular cross-sectional shape will be described as an example.

  The center part of the mold part 3 is formed as a solid shape having a rectangular cross-section, and the upper end thereof is slightly above the upper end of the optical fiber cable 1 and is extended downward to be 1 to 3 or 1 to 4 as described above. It is arranged in the longitudinal direction with a thickness within the range of double. A drop cable 4 having an optical wiring branched from a single optical fiber cable is provided inside the mold portion 3, and one input port that forms an introduction portion and one input port that forms a lead-out portion are formed on this optical wiring. An output port is connected, the output port is disposed in the optical connector 5, and the input port is disposed in the mold part 3. An optical connector 6 attached to the tip of the drop cable 4 is connected to the optical connector 5. The former is an optical connector socket, and the latter is an optical connector plug. Both optical connectors 5 and 6 are configured as waterproof connectors. The mold part 3 having the optical wiring is provided with an optical wiring inside, and the optical connector 5 is attached so as to be connectable to the outer surface to be molded, and the optical connector 5 exposes a part of the drop cable 4 ( 1 (b)) or without exposing the drop cable 4 (FIG. 1 (a)). In this way, the branch is formed as a mold type and is not opened for work. Moreover, it is not necessary to open.

  What is mounted inside the mold part 3 is a part of the drop cable 4 provided with optical wiring and the optical connector 5 directly connected to the optical wiring and has a small number of parts. As described above, it can be formed into an elongated solid body having a thickness of about 1 to 3 or 1 to 4 times the thickness of the optical fiber cable 1, and is elongated along the longitudinal direction of the optical fiber cable 1. Can be arranged in the direction. The mold part 3 is allowed to be 1 to 5 times the thickness of the optical fiber cable 1.

  As shown in FIGS. 1 to 3, when the optical connector 5 is installed in the longitudinal direction, it is necessary to provide at least a width sufficient to arrange the optical connector 5 in this case. The thickness of 3 is thicker than the thickness of the optical fiber cable 1. When the thickness of the mold part 3 is the same as that of the optical fiber cable 1, the optical connector 5 is installed facing downward.

  In the case of FIG. 1 (a), the optical connector 5 is fixed to the mold part 3. However, as shown in FIG. 1 (b), the optical connector 5 is a separation type that is brought outside via the drop cable 4. You can also In this case, the drop cable provided with the branched optical wiring is extended from the mold part 3, and the optical connector 5 is provided at the extended end part. If it does in this way, only the extension part installation area will be required for the mold part 3 in a longitudinal direction, and the mold part 3 can be made more elongated and can be made into a cable shape. Therefore, wiring work becomes easy. FIG. 4 shows an example in which the diameter of the mold part 3 is 5 L with respect to the thickness L of the drop cable 1. When it is 5 L or more, there is a possibility that the characteristics as the cable shape are lost. The optical connector 5 is preferably attached with a waterproof cap when not in use.

  Thus, the optical fiber branched from the optical fiber cable 1 is wired and molded in the longitudinal direction to the optical fiber cable 1 extending in the longitudinal direction, and 1 to 5 times the thickness of 1 of the optical fiber cable, One optical connector 6 attached to the tip of the drop cable 4 and the other optical connector to which the optical wiring is directly connected are provided with the molded portion 3 having a slender dimension of 1 to 4 times or 1 to 3 times or less. 3 is configured to be connectable to the outer surface of the optical fiber.

When it is necessary to pull down, the optical connector 6 of the drop cable 4 is connected to the optical connector 5 of the branching section 3, so that it can be easily pulled down by joining the optical connectors 5 and 6. This is a great advantage that only a cable-like handling is required, the construction period can be greatly shortened, and only the joining work of the optical connectors 5 and 6 is performed, so that a skilled worker is not required. Compared to the construction period in which the splitter installation work that is built in the conventional closure is built in the branch section, this embodiment can greatly shorten the branch work and does not require a skilled worker. There is.
In the above example, the mold body including the support wire 2 can be formed.

  FIG. 5 shows a second embodiment of the present invention. The same number is attached | subjected to the structure same as a 1st Example, and the description of a 1st Example shall be used.

  In FIG. 5, one or a plurality of input ports and a plurality of output ports 11 are provided in the optical wiring routed inside the mold part, and the plurality of output ports 11 are arranged in parallel in the longitudinal direction as a plurality of output ports. The That is, the optical connector 5 in FIG. 1 may be configured as an adapter. The optical connector 5 is connected to the optical connector 6 of the drop cable 4 as shown in FIG.

  In the optical fiber cable 1 shown in FIG. 5, a splitter for branching the signal of the optical fiber cable into a plurality of signals is incorporated in the mold part 3 incorporated in the optical fiber cable 1. Therefore, a mold including the splitter is formed. The light divided by the splitter inside the mold part 3 is connected to the drop cable 4 by an optical connector (adapter) attached to the outer surface of the mold part 3. As a splitter inside the mold unit 3, 2 × n having a plurality of input ports can be considered as a modified example in addition to the 1 × n splitter having one input boat. Further, in a splitter having a plurality of input ports, a structure having an input port outside is also conceivable as a modification.

  In this way, the optical wiring is provided with one or a plurality of input ports and a plurality of output ports, and in the case of a plurality of output ports, an optical fiber cable provided with an adapter 1 in which an optical connector is provided with a plurality of output ports. Is configured.

  FIG. 6 shows a third embodiment of the present invention. Forming the mold part 3 is the same as in the previous two embodiments. The mold part 3 becomes a first mold part, and a recessed space part 19 is formed in a digging shape below the mold part 3, and a branch module 17 as a second mold part is provided.

  The mold part 3 has connection parts 15 and 16 that are exposed and separated from each other along the longitudinal direction on both sides. The connection portion 15 is an upstream connection portion, and the connection portion 16 is a downstream connection portion, and includes joint portions 18 and 19, respectively. A removable cassette-type cassette module 17 having joint portions 20, 21 on both longitudinal sides and connected to connection portions 15, 16, respectively, is inserted between the connection portions 15, 16. The parts 18 and 19 and the joint parts 20 and 21 are fixed.

  The branch module 17 is configured as a branch type cassette module 17A (FIG. 6A), a split type cassette module 17B (FIG. 6B) or a downstream feed type cassette module 17C (FIG. 6C). Is characterized in that the branch part 3 has joint parts 20 and 21 on both sides in the longitudinal direction and is provided with a cable-like removable cassette type cassette module connected to the connection parts 15 and 16 in the longitudinal direction. .

  As described above, an optical fiber cable having a branching part for dropping to a drop cable is wired in a cable shape in the longitudinal direction to the optical fiber cable 1 extending in the longitudinal direction and the optical wiring branched from the optical fiber cable. A first molded portion integrally molded with the optical fiber cable, and a second elongated mold portion having a lead-out portion for introducing the optical connector, the second mold portion being connected to the lead-out portion. It is formed as a longitudinal cable-like cassette module that is detachable from a first mold part that includes an optical wiring to be connected and is connected to an optical connector.

  The branch type branch module 17A shown in FIG. 6A includes an input port connected to an optical wiring branched from a single optical fiber cable in the joint portion 20, and the optical port 23 is connected to the input port. It has an optical connector 5 (see FIG. 1) that is connected and has a single output port that is pulled down to a drop cable 4 (see FIG. 1). Therefore, the optical connector 5 is the only one. In the case shown in FIG. 6A, the optical connector 5 is exposed downward from the outer surface of the cassette module 17A, and the optical connector 5 and the joint portion 21 are separated.

  The split-type cassette module 17B shown in FIG. 6B has the same configuration, but the optical wiring 23 wired in the cassette module 17B is branched into a plurality by the splitter 22. The branched optical wiring 23 is connected to the output port in the plurality of optical connectors 5 arranged in parallel. In the case shown in FIG. 6B, the optical connector 5 is exposed downward from the outer surface of the cassette module 17B.

  The downstream feed cassette module 17C shown in FIG. 6C has an input port and an exit port in the joint portions 20 and 21 arranged in the longitudinal direction, respectively, and the optical information from the upstream optical fiber cable 1A is sent to the downstream feed type cassette. This is transmitted to the optical fiber cable of the aerial fiber module 1B on the downstream side via the optical wiring in the module 17C. Therefore, in the case shown in FIG. 6C, the optical connector 5 is also used as the joint portion 21 and is disposed in the longitudinal direction.

  A jumper cord (optical fiber cord) 17D can be used instead of the solid mold type cassette module 17C. This jumper cord is a cord type, and can be used as an example of a downstream feed type branch module, and also serves as joints 20 and 21 at both ends, that is, optical connectors, respectively.

And according to these configurations,
An optical fiber cable 1 in which the cassette module 17A has one input port branched from the optical fiber cable and a single output port connected to the input port and pulled down to the drop cable 6.
An optical fiber cable 1 having one or a plurality of input ports and a plurality of output ports in the cassette module 17B, and the optical connector 5 being configured as an adapter having a plurality of output ports;
In addition to one cassette module, another replaceable cassette module 17C is provided, and the branch module 17C is configured as an optical fiber configured as a downstream feed connection for connecting the upstream optical fiber cable 1A to the downstream fiber cable 1B. Cable 1,
An optical fiber cable in which the cassette module is composed of a jumper cord 17D;
Two or three of the aforementioned branch modules are provided with an optical fiber cable 1 that has the same body length in the longitudinal direction and can be installed in the same connection portion provided in the optical fiber cable. The

1 is an external view showing the configuration of a first embodiment of the present invention. The structure external view about the example which shows the optical fiber cable shown in FIG. 1 in detail. Xx sectional drawing of FIG. The modification of the 1st example of the present invention. The external view which shows the structure of the 2nd Example of this invention. The external view which shows the various condition lines of the 3rd Example of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Aerial optical fiber cable (optical fiber cable) which accommodates an optical fiber cable, 1A ... Upstream optical fiber cable, 1B ... Downstream optical fiber cable, 2 ... Support line, 3 ... Mold part (mold body), 4 Drop cable, 5 Optical connector (optical connector socket), 6 Optical connector (optical connector plug), 11 Output port, 15 upstream connection, 16 downstream connection, 17 cassette module, 17A branch Type cassette module, 17B ... split type cassette module, 17C ... downstream feed type cassette module, 17D ... jumper cord (optical fiber cord), 18, 20 ... upstream joint, 19, 21 ... downstream joint, 22 ... splitter, 23 ... optical wiring.

Claims (9)

In the optical fiber cable having a branching part for pulling it to the drop cable,
An optical fiber cable extending in the longitudinal direction is provided in a cable shape in the longitudinal direction, and an optical wiring branched from the optical fiber cable is formed integrally with the fiber cable, and a lead-out portion for leading out the optical connector is provided. An optical fiber cable comprising an elongated mold part.   2. The optical fiber cable according to claim 1, wherein the mold part has an elongated dimension in which a diameter or a dimension of a longest cross section is within 1 to 5 times a dimension of a thickness of the optical fiber cable.   2. The optical fiber cable according to claim 1, wherein the mold portion has an elongated dimension in which the diameter or the dimension of the longest cross-section is 1 to 3 or 1 to 4 times the thickness of the dimension of the optical fiber cable. .   4. The optical fiber cable according to claim 1, wherein the mold portion includes a plurality of lead-out portions along a longitudinal direction. 5. In the optical fiber cable having a branching part for pulling it to the drop cable,
The optical fiber cable extending in the longitudinal direction is provided with a first mold portion that is formed in a cable shape in the longitudinal direction and an optical wiring branched from the optical fiber cable and molded integrally with the optical fiber cable. A second elongated mold portion having a lead-out portion for introducing an optical connector; the second mold portion includes an optical wiring connected to the lead-out portion; and the first mold portion connected to the optical connector. An optical fiber cable, characterized in that it is formed as a longitudinal cable-like cassette module that can be removed from a mold part.   6. The optical fiber cable according to claim 5, wherein the branch module includes one input port branched from the optical fiber cable and a single output port that forms a lead-out portion to be pulled down to the drop cable.   6. The optical fiber cable according to claim 5, wherein the second module part includes a plurality of output ports along a longitudinal direction.   6. The second module unit according to claim 5, wherein when the cassette module is removed, another cassette module having a downstream feed connection unit that connects the upstream optical fiber cable to the downstream fiber cable is mounted and replaced. An optical fiber cable characterized by being configured as described above.   6. The optical fiber cable according to claim 5, wherein the cassette module includes a jumper cord.

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