JP2019168544A - Closure for optical fiber connection - Google Patents

Abstract

To provide a closure for optical fiber connection capable of improving discriminability of a line.SOLUTION: A tray unit 7 of a closure comprises: a tape connection tray 10 housing a connection portion of an optical fiber ribbon 3 and an inner fiber ribbon 23 and a connection portion of an optical fiber ribbon 5 and an inner fiber ribbon 24; a branch tray 11 housing a branch portion at which the inner fiber ribbon 23 is branched into a plurality of fiber codes and a branch portion at which the inner fiber ribbon 24 is branched into a plurality of fiber codes 33a, 33b, 33c and 33d; CATV line trays 12 and 13 housing a connection portion of CATV line codes 31a and 31b and a CATV line code 33a; monitoring line trays 14 and 15 housing a connection portion of a monitoring line code 31c and monitoring line codes 33b and 33c; and an FTTH line tray 16 housing a connection portion of an FTTH line code 31d and an FTTH special code 66.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an optical fiber connection closure.

  As a conventional optical fiber connection closure, for example, a technique described in Patent Document 1 is known. An optical fiber connection closure described in Patent Document 1 includes a lower extension termination tray that accommodates a connector connecting portion between an optical fiber and a tape core drawn from an optical cable, an optical fiber drawn from the optical cable, and a DS / R / TD. DS / R / TD termination tray for housing connector connection portion with cable, drop termination tray for housing connector connection portion of optical fiber and drop cable pulled down from optical cable, splitter tray for housing splitter module, It has. These termination trays and splitter trays are pivotally attached to a tray mounting portion that is slidably provided on the tray fixing base in a stacked state.

JP 2007-121603 A

  In the above prior art, in order to accommodate a required number of connector connecting portions, the connector connecting portions are distributed over a plurality of termination trays. However, when a plurality of different types of lines such as a CATV line and a monitoring line are used, if the optical parts such as an optical splitter and the connector connection part are not accommodated separately for each line type, the line identification is poor. It becomes difficult to perform switching connection work and the like.

  An object of the present invention is to provide an optical fiber connection closure capable of improving line identification.

  One aspect of the present invention is an optical fiber connection closure for connecting a first optical fiber ribbon of a first optical cable and a second optical fiber ribbon of a second optical cable. A tray unit having a multi-stage structure supported so as to be able to be pulled out on the front side. The tray unit accommodates a connection portion between the first optical fiber ribbon and the first internal fiber ribbon, and the second unit. While accommodating the 1st tray which accommodates the connection part of an optical fiber tape cable core and a 2nd internal fiber tape cable core, and the 1st branch part which branches the 1st internal fiber tape cable core into a plurality of 1st fiber cords A second tray for accommodating a second branching portion for branching the second internal fiber ribbon into a plurality of second fiber cords, and a first CATV line cord of the plurality of first fiber cords Among the plurality of second fiber cords, a third tray for accommodating a connection portion with a second CATV line cord, and among the first monitoring line cord and the plurality of second fiber cords among the plurality of first fiber cords A fourth tray for accommodating a connection portion with the second monitoring line cord, and a fifth tray for accommodating a connection portion between the FTTH line cord and the FTTH-dedicated optical fiber cord among the plurality of first fiber cords. The first tray, the second tray, the third tray, the fourth tray, and the fifth tray are rotatable in the vertical direction.

  According to the present invention, line identification can be improved.

1 is a schematic front view showing an optical fiber connection closure according to a first embodiment of the present invention. It is a conceptual diagram which shows the wiring form of the tray unit shown by FIG. 1 whole. It is the perspective view which looked at the closure for optical fiber connection shown by FIG. 1 from upper direction. It is a top view of the tape connection tray shown by FIG. FIG. 2 is a perspective view showing a state where a branch tray is exposed in the optical fiber connection closure shown in FIG. 1. FIG. 2 is a perspective view showing a state in which an upper CATV line tray is exposed in the optical fiber connection closure shown in FIG. 1. FIG. 7 is an enlarged perspective view showing a state where the optical coupler module shown in FIG. 6 is popped up. It is a figure which shows the wiring form of the code | cord | chord for a CATV line | wire between the branch tray shown by FIG. 2, and a CATV line | wire tray. FIG. 2 is a perspective view showing a state in which an upper monitoring line tray is exposed in the optical fiber connection closure shown in FIG. 1. FIG. 2 is a perspective view showing a state in which a lower monitoring line tray is exposed in the optical fiber connection closure shown in FIG. 1. It is an expansion perspective view which shows the area | region containing the optical connector adapter in the monitoring line tray shown by FIG. It is a figure which shows the wiring form of the code | symbol for monitoring lines between the upper and lower monitoring line trays shown by FIG. FIG. 2 is a perspective view showing a state where an FTTH line tray is exposed in the optical fiber connection closure shown in FIG. 1. It is a figure which shows the wiring form of the code | cord | chord for a FTTH line | wire and the FTTH exclusive code | cord | chord between the branch tray shown in FIG. 2, and a FTTH line | wire tray. It is a schematic front view which shows the closure for optical fiber connection which concerns on 2nd Embodiment of this invention. FIG. 16 is a conceptual diagram showing the overall wiring configuration of the tray unit shown in FIG. 15. FIG. 16 is a perspective view of the CATV line tray shown in FIG. 15. It is a figure which shows the wiring form of the code | cord | chord for a CATV line | wire and the code | symbol for hold | maintenance lines between the branch tray shown in FIG.

[Description of Embodiment of the Present Invention]
First, embodiments of the present invention will be listed and described.

  One aspect of the present invention is an optical fiber connection closure for connecting a first optical fiber ribbon of a first optical cable and a second optical fiber ribbon of a second optical cable. A tray unit having a multi-stage structure supported so as to be able to be pulled out on the front side. The tray unit accommodates a connection portion between the first optical fiber ribbon and the first internal fiber ribbon, and the second unit. While accommodating the 1st tray which accommodates the connection part of an optical fiber tape cable core and a 2nd internal fiber tape cable core, and the 1st branch part which branches the 1st internal fiber tape cable core into a plurality of 1st fiber cords A second tray for accommodating a second branching portion for branching the second internal fiber ribbon into a plurality of second fiber cords, and a first CATV line cord of the plurality of first fiber cords Among the plurality of second fiber cords, a third tray for accommodating a connection portion with a second CATV line cord, and among the first monitoring line cord and the plurality of second fiber cords among the plurality of first fiber cords A fourth tray for accommodating a connection portion with the second monitoring line cord, and a fifth tray for accommodating a connection portion between the FTTH line cord and the FTTH-dedicated optical fiber cord among the plurality of first fiber cords. The first tray, the second tray, the third tray, the fourth tray, and the fifth tray are rotatable in the vertical direction.

  In such an optical fiber connection closure, the connection portion between the first CATV line cord of the plurality of first optical fiber cords and the second CATV line cord of the plurality of second optical fiber cords is a third portion. Housed in a tray. A connection portion between the first monitoring line cord of the plurality of first optical fiber cords and the second monitoring line cord of the plurality of second optical fiber cords is accommodated in the fourth tray. A connection portion between the FTTH line cord and the FTTH-dedicated optical fiber cord among the plurality of first optical fiber cords is accommodated in the fifth tray. Thus, the CATV line, the monitoring line, and the FTTH line are accommodated separately in different trays for each line type. This improves line identification.

  The first tray is arranged at the uppermost stage of the tray unit, the second tray is arranged one stage below the first tray, and the third tray and the fourth tray are arranged at the lower stage side of the second tray. The fifth tray may be disposed on the lower side of the third tray and the fourth tray. When the optical fiber connection closure is installed, the connection work is performed only on the first tray. However, since the first tray is arranged on the uppermost stage of the tray unit, a wide work space is secured, so the connection work is performed. Is easier to do. Further, by arranging the first tray at the uppermost stage of the tray unit, the first optical fiber ribbon and the second optical fiber ribbon, and the first fiber cord and the second fiber cord do not cross each other.

  A first introduction part into which the first optical fiber ribbon and the second optical fiber ribbon are introduced is provided on the front side of the first tray, and the first internal portion is provided on the back side of the first tray. A second introduction part into which the fiber tape core wire and the second internal fiber tape core wire are introduced is provided, and on the front side of the second tray, the first internal fiber tape core wire and the second internal fiber tape core wire are provided. Is provided, and on the back side of the second tray is provided a second lead-out portion from which the first fiber cord and the second fiber cord are led out, the third tray, A third introducing portion into which the first fiber cord and the second fiber cord are introduced may be provided on the near side of the fourth tray and the fifth tray. In such a configuration, the first tray and the second tray are prevented from being mixed with different types of optical fibers.

  The tray unit may have a seven-stage structure. In such a configuration, the CATV line, the monitoring line, and the FTTH line can be appropriately wired according to the usage form.

  The number of stages of the third tray and the fourth tray is two, and the first CATV line cord and the second CATV line cord are connected via a plurality of types of first optical component modules having different configurations. The first optical component module of the type is accommodated in a third tray of a different stage, and the first monitoring line cord and the second monitoring line cord are connected via the second optical component module and the optical connector adapter. The second optical component module and the optical connector adapter may be accommodated in different stages of the fourth tray, and the fifth tray may be disposed at the lowermost stage of the tray unit. In such a configuration, the necessary number of CATV lines and monitoring lines can be efficiently wired. The FTTH line is less frequently connected and switched than the CATV line and the monitoring line. Therefore, it is appropriate to arrange the fifth tray at the lowest level of the tray unit.

  The number of stages of the third tray is one stage, the first CATV line cord and the second CATV line cord are connected via optical components, the number of stages of the fourth tray is two stages, The monitoring line cord and the second monitoring line cord are connected via an optical component module and an optical connector adapter, and the optical component module and the optical connector adapter are accommodated in fourth trays in different stages, A sixth tray in which a reserved line cord among a plurality of second fiber cords is accommodated may be disposed at the lowermost stage of the tray unit. Even with such a configuration, the necessary number of CATV lines and monitoring lines can be efficiently wired. In addition, since the reserved line cord is not normally used at the time of installation, it is preferable to arrange the sixth tray at the lowest stage of the tray unit.

The first CATV line cord and the optical component input unit may be fusion-connected, and the second CATV line cord and the optical component output unit may be fusion-connected. In such a configuration, since the loss when transmitting the CATV line in the closure is reduced, the signal reach can be improved.
[Details of the embodiment of the present invention]

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, the same or equivalent elements are denoted by the same reference numerals, and redundant description is omitted.

  FIG. 1 is a schematic front view showing an optical fiber connection closure according to the first embodiment of the present invention. In FIG. 1, an optical fiber connection closure 1 (hereinafter simply referred to as closure 1) of this embodiment is applied to, for example, an HFC (Hybrid fiber-coaxial) wiring system. The closure 1 is an aerial optical fiber 2 (first optical cable) optical fiber tape core 3 (first optical fiber ribbon) and subscriber optical fiber 4 (second optical cable) optical fiber ribbon. 5 (second optical fiber ribbon) is connected.

  The closure 1 includes a support body 6 and a tray unit 7 having a seven-stage structure supported by the support body 6 so as to be able to be pulled out to the near side (front side). The support 6 and the tray unit 7 are accommodated in a closure case (not shown). Seal members 8 are respectively attached to both ends of the closure case. The optical cables 2 and 4 pass through the seal member 8 and are introduced into the closure 1.

  As shown in FIG. 2, the tray unit 7 includes a tape connection tray 10, a branching tray 11, two-stage CATV line trays 12 and 13, two-stage monitoring line trays 14 and 15, and an FTTH line tray 16. Group 17 is included.

  The tape connection tray 10 is arranged on the uppermost stage of the tray unit 7. The branch tray 11 is arranged one level below the tape connection tray 10, that is, the second level from the top of the tray unit 7. The CATV line tray 12 is arranged one level below the branch tray 11, that is, the third level from the top of the tray unit 7. The CATV line tray 13 is arranged one level below the CATV line tray 12, that is, the fourth level from the top of the tray unit 7. The monitoring line tray 14 is arranged one level below the CATV line tray 13, that is, the fifth level from the top of the tray unit 7. The monitoring line tray 15 is arranged one level below the monitoring line tray 14, that is, the sixth level from the top of the tray unit 7. The FTTH line tray 16 is arranged one level below the monitoring line tray 15, that is, the lowest level of the tray unit 7.

  The tape connection tray 10, the branch tray 11, the CATV line trays 12 and 13, the monitoring line trays 14 and 15, and the FTTH line tray 16 can be independently turned up and down via the two shaft portions 18. Yes. Although not shown, the support 6 holds the tape connection tray 10, the branch tray 11, the CATV line trays 12 and 13, the monitoring line trays 14 and 15 and the FTTH line tray 16 in a state of being rotated upward. A string-like fastener is attached.

  As shown in FIG. 3, the tray unit 7 has a protrusion 19 disposed at the rear of the tray group 17. In FIG. 3, the tape connection tray 10 is omitted. A guide portion 20 is provided on the upper surface of the protrusion 19. The support 6 is provided with a guide rail 21 into which the guide portion 20 is fitted. The guide rail 21 extends in the front-rear direction. As the guide portion 20 moves along the guide rail 21, the tray unit 7 moves forward and backward. As a result, the tray unit 7 can be pulled out to the front as a whole.

  As shown in FIG. 4, the tape connection tray 10 accommodates a connection portion between the optical fiber tape core 3 and the internal fiber tape core 23 (first internal fiber tape core), and also includes an optical fiber tape core. 5 is a first tray that accommodates a connection portion between 5 and the internal fiber tape core 24 (second internal fiber tape core). Here, the number of cores of the optical fiber ribbons 3 and 5 and the internal fiber ribbons 23 and 24 are all four.

  An introduction portion 25 (first introduction portion) into which the optical fiber ribbon 3 is introduced is provided on the front side of one end portion of the tape connection tray 10. An introduction portion 26 (first introduction portion) into which the optical fiber ribbon 5 is introduced is provided on the front side of the other end portion of the tape connection tray 10. An introduction portion 27 (second introduction portion) into which the internal fiber tape core wire 23 is introduced is provided on the back side of one end portion of the tape connection tray 10. An introduction portion 28 (second introduction portion) into which the internal fiber tape core wire 24 is introduced is provided on the back side of the other end portion of the tape connection tray 10.

  The optical fiber ribbon 3 and the internal fiber ribbon 23 are fusion-connected. The optical fiber ribbon 5 and the internal fiber ribbon 24 are fusion-connected. The tape connection tray 10 includes a fusion splicing portion 29 between the optical fiber tape core wire 3 and the internal fiber tape core wire 23, and a fusion splicing portion 30 between the optical fiber tape core wire 5 and the internal fiber tape core wire 24. Are accommodated together with the extra lengths of the optical fiber ribbons 3 and 5 and the internal fiber ribbons 23 and 24. Although not shown, the tape connection tray 10 is covered with a transparent cover.

  As shown in FIGS. 3 and 5, the branch tray 11 has a branch portion 32 (first fiber branch) that branches the inner fiber tape core wire 23 into a plurality (four in this case) of fiber cords 31 (first fiber cords). A second branch section that houses the branch section 34 (second branch section) that branches the inner fiber tape core wires 24 into a plurality (four in this case) of fiber cords 33 (second fiber cords). It is a tray. As the branch part 32, for example, one or two working systems exist and one for FTTH (Fiberto the Home) exists. For example, there are eight branch portions 34.

  On one side of the central portion of the branch tray 11, a branch portion fixing portion 35 that fixes the branch portion 32 is provided. On the other side of the central portion of the branch tray 11, a branch portion fixing portion 36 that fixes the branch portion 34 is provided. For example, the branch fixing portions 35 and 36 have a four-row two-stage structure. Further, two R guide portions 37 are provided in the central portion of the branch tray 11. R guide portions 38 are provided at both ends of the branch tray 11, respectively.

  A lead-out part 39 (first lead-out part) from which the internal fiber tape core wire 23 is led out is provided on the front side of one end of the branch tray 11. On the front side of the other end of the branch tray 11, a lead-out part 40 (first lead-out part) from which the internal fiber tape core wire 24 is led out is provided. Deriving portions 41 (second deriving portions) from which the fiber cords 31 and 33 are led out are respectively provided on the far side of both ends of the branching tray 11.

  In the branch tray 11, the internal fiber tape core wires 23 and 24 and the fiber cords 31 and 33 are accommodated along the R guide portions 37 and 38.

  As shown in FIG. 2, the fiber cord 31 is used as a CATV line code 31a, 31b used as a CATV (Common Antenna Television) line, a monitor line code 31c used as a monitor line, and an FTTH line. FTTH line code 31d. The CATV line cords 31 a and 31 b are, for example, No 1 and No 2 fiber cords 31. The monitoring line cord 31 c is the No. 3 fiber cord 31. The FTTH line cord 31d is the No. 4 fiber cord 31. In addition, said No has shown the identification number of the optical fiber (code) for convenience.

  As shown in FIG. 2, the fiber cord 33 includes a CATV line cord 33a used as a CATV line, monitoring line cords 33b and 33c used as monitoring lines, and a reserved line code 33d not used. Contains. The CATV line cord 33a is, for example, the No. 1 fiber cord 33. The monitoring line cords 33 b and 33 c are No 2 and No 3 fiber cords 33. The reserved line cord 33 d is the No. 4 fiber cord 33.

  The CATV line trays 12 and 13 are third trays that accommodate connection portions between the CATV line cords 31a and 31b and the CATV line cord 33a. The CATV line cords 31 a and 31 b and the CATV line cord 33 a are connected via an optical coupler module 43, a patch cord 44, and an optical splitter module 45. The optical coupler module 43 and the optical splitter module 45 are first optical component modules of different types. The optical coupler module 43 and the optical splitter module 45 have different configurations and functions.

  In the optical coupler module 43, optical couplers constituting a CATV downlink are modularized in a minimum unit. The optical coupler is, for example, a 2 × 2 coupler. In the optical splitter module 45, the optical splitter constituting the CATV downlink is modularized in a minimum unit. The optical splitter is, for example, a 1 × 4 splitter. The optical coupler module 43 and the optical splitter module 45 are connected in series via the patch cord 44. The patch cord 44 is an optical fiber cord having optical connectors (LC connectors here) attached to both ends.

  As shown in FIG. 6, an optical coupler module 43 is accommodated on one end side of the CATV line tray 12. The optical coupler module 43 has a maximum of two optical couplers. An empty holding module 46 is accommodated on the other end side of the CATV line tray 12. An R guide 47 is provided at the center of the CATV line tray 12.

  The rear end portion (the end portion opposite to the optical connector insertion / extraction side) of the optical coupler module 43 is rotatably attached to the CATV line tray 12 via the shaft portion. Thereby, as FIG. 7 shows, the front-end side (optical connector insertion / extraction side) of the optical coupler module 43 can be popped up. Accordingly, a space for inserting / removing the optical connectors of the CATV line cords 31a, 31b and the patch cord 44 is secured, so that the CATV line cords 31a, 31b and the patch cord 44 can be easily inserted into and removed from the optical coupler module 43. .

  On the front side of one end of the CATV line tray 12, an introduction part 48 (third introduction part) into which the CATV line cords 31a and 31b are introduced is provided. An introduction portion 49 (third introduction portion) into which the reserved line cord 33d is introduced is provided on the front side of the other end portion of the CATV line tray 12. Deriving portions 50 from which the patch cords 44 are led out are provided on the far side of both ends of the CATV line tray 12.

  An optical splitter module 45 is accommodated on one end side of the CATV line tray 13. The optical splitter module 45 has a maximum of two optical splitters. The optical splitter module 45 is rotatably attached to the CATV line tray 13 so as to be popped up like the optical coupler module 43. An R guide portion 51 is provided at the center of the CATV line tray 13.

  An introduction portion 52 into which the patch cord 44 is introduced is provided on the front side of one end portion of the CATV line tray 13. An introduction portion 53 (third introduction portion) into which the CATV line cord 33a is introduced is provided on the near side of the other end portion of the CATV line tray 13.

  As shown in FIG. 8, the CATV line cords 31 a and 31 b are guided from the branch tray 11 to the CATV line tray 12 and connected to the optical coupler module 43 by connectors. At this time, the CATV line cords 31 a and 31 b are accommodated in the CATV line tray 12 along the R guide portion 47. The CATV line tray 12 accommodates a patch cord 44 connected to the optical coupler module 43 along the R guide portion 47. The patch cord 44 is guided from the CATV line tray 12 to the CATV line tray 13 and connected to the optical splitter module 45 by a connector. At this time, the patch cord 44 is accommodated along the R guide portion 51 in the CATV line tray 13.

  The CATV line cord 33 a is guided from the branch tray 11 to the CATV line tray 13 and connected to the optical splitter module 45 by a connector. At this time, the CATV line cord 33 a is accommodated in the CATV line tray 13 along the R guide portion 51.

  The hold line cord 33d is led from the branch tray 11 to the CATV line tray 12, and is connected to the hold module 46 by a connector. At this time, the reserved line code 33 d is accommodated in the CATV line tray 12 along the R guide portion 47.

  The monitoring line trays 14 and 15 are fourth trays that accommodate connection portions between the monitoring line cord 31c and the monitoring line cords 33b and 33c. The monitoring line cord 31c and the monitoring line cords 33b and 33c are connected via an optical coupler module 55 (second optical component module), a patch cord 56, and an optical connector adapter 57. In the optical coupler module 55, optical couplers constituting a monitoring line are modularized in a minimum unit. The optical coupler is, for example, a 2 × 2 coupler and a 1 × 2 coupler.

  As shown in FIG. 9, an optical coupler module 55 is accommodated on one end side of the monitoring line tray 14. The optical coupler module 55 has a maximum of two optical couplers. The optical coupler module 55 is rotatably attached to the monitoring line tray 14 so as to be popped up. When switching connection is performed, an operation of allocating optical components in the monitoring line is involved. For this reason, an empty space is provided on the other end side of the monitoring line tray 14 so that it can be added as necessary. An R guide portion 58 is provided in the central portion of the monitoring line tray 14.

  On the front side of both ends of the monitoring line tray 14, an introduction part 59 (third introduction part) into which the monitoring line cord 31c is introduced is provided. Deriving portions 60 from which the patch cords 56 are led out are provided on the far side of both ends of the monitoring line tray 14.

  As shown in FIGS. 10 and 11, three optical connector adapters 57 to which a plurality of sets of optical contactors can be respectively connected are accommodated in series in the central portion of the monitoring line tray 15. R guide portions 61 are provided at both ends of the monitoring line tray 15, respectively. On the front side of both ends of the monitoring line tray 15, an introduction part 62 (third introduction part) into which the monitoring line cords 33b and 33c and the patch cord 56 are introduced is provided.

  Monitoring line cords 33b and 33c and a patch cord 56 are connected to the optical connector adapter 57 by connectors. The optical connector adapter 57 is usually covered with a lid 63. The lid 63 is rotatably attached to the monitoring line tray 15. The bottom plate of the monitoring line tray 15 is provided with three holes 64 through which the optical connector adapter 57 is pushed out. Therefore, the optical connector can be easily inserted into and removed from the optical connector adapter 57.

  As shown in FIG. 12, the monitoring line cord 31 c is guided from the branch tray 11 to the monitoring line tray 14 and connected to the optical coupler module 55 by a connector. At this time, the monitoring line cord 31 c is accommodated along the R guide portion 58 in the monitoring line tray 14. The monitoring line tray 14 accommodates a patch cord 56 connected to the optical coupler module 55 along the R guide portion 58. The patch cord 56 is guided from the monitoring line tray 14 to the monitoring line tray 15 and connected to the optical connector adapter 57 by a connector. At this time, the patch cord 56 is accommodated in the monitoring line tray 15 along the R guide portion 61.

  The monitoring line cords 33 b and 33 c are guided from the branch tray 11 to the monitoring line tray 15 and connected to the optical connector adapter 57 by a connector. At this time, the monitoring line cords 33 b and 33 c are accommodated in the monitoring line tray 15 along the R guide portion 61. The monitoring line cords 33 b and 33 c are cascade-connected via the optical connector adapter 57.

  The FTTH line tray 16 is a fifth tray that accommodates a connecting portion between the FTTH line cord 31d and the FTTH dedicated cord 66. The FTTH line cord 31 d and the FTTH dedicated cord 66 are connected via an optical connector adapter 67. The FTTH dedicated cord 66 is an FTTH dedicated optical fiber cord connected to the FTTH branch section 32.

  As shown in FIG. 13, an optical connector adapter 67 is accommodated in the center of the FTTH line tray 16. An FTTH line cord 31d and an FTTH dedicated cord 66 are connected to the optical connector adapter 67 by connectors. The optical connector adapter 67 is usually covered with a lid 68. R guide portions 69 are provided at both ends of the FTTH line tray 16. An introduction portion 70 (third introduction portion) into which the FTTH line cord 31d and the FTTH dedicated cord 66 are introduced is provided on the front side of both ends of the FTTH line tray 16.

  As shown in FIG. 14, the FTTH line cord 31 d and the FTTH dedicated cord 66 are guided from the branch tray 11 to the FTTH line tray 16 and are connected to the optical connector adapter 67 by connectors. At this time, the FTTH line cord 31d and the FTTH dedicated code 66 are accommodated in the FTTH line tray 16 along the R guide portion 69.

  When the closure 1 as described above is installed on the site, the optical fiber tape core 3 exposed by removing the coating of the optical cable 2 and the inner fiber tape core 23 are fused and connected, and the optical cable 4 is covered. The optical fiber tape core wire 5 and the internal fiber tape core wire 24 which are exposed by removing the above are fused and connected. That is, when the closure 1 is installed, the work is performed only on the tape connection tray 10. Thereafter, when the number of subscribers exceeds a certain level, switching connection is performed in the CATV line trays 12 and 13 and the monitoring line trays 14 and 15.

  As described above, in this embodiment, the connection portion between the CATV line cords 31a and 31b of the plurality of fiber cords 31 and the CATV line cord 33a of the plurality of fiber cords 33 is the CATV line tray. 12 and 13. Connection portions between the monitoring line cord 31 c of the plurality of fiber cords 31 and the monitoring line cords 33 b and 33 c of the plurality of fiber cords 33 are accommodated in the monitoring line trays 14 and 15. Of the plurality of fiber cords 31, the connection portion between the FTTH line cord 31 d and the FTTH dedicated cord 66 is accommodated in the FTTH line tray 16. Thus, the CATV line, the monitoring line, and the FTTH line are accommodated separately in different trays for each line type. As a result, line identification becomes high, and line switching connection work is facilitated.

  In the present embodiment, the tray unit 7 is supported by the support 6 so as to be able to be pulled out to the front side, and includes a tape connection tray 10, a branch tray 11, CATV line trays 12, 13, monitor line trays 14, 15 and The FTTH line tray 16 can be rotated in the vertical direction. For this reason, unlike the case where, for example, a pull-out tray is used, the inner fiber ribbons 23 and 24 and the fiber cords 31 and 33 are not pulled toward the front side. Accordingly, it is possible to prevent the internal fiber tape cores 23 and 24 and the fiber cords 31 and 33 from being pulled between different trays.

  In this embodiment, since the tape connection tray 10 is arranged at the uppermost stage of the tray unit 7, a wide work space is secured. Therefore, it becomes easy to perform connection work when the closure 1 is installed. Further, the inner fiber tape core wires 23 and 24 and the fiber cords 31 and 33 do not cross each other.

  Further, in the present embodiment, introduction portions 25 and 26 into which the optical fiber ribbons 3 and 5 are introduced are provided on the front side of the tape connection tray 10, and the inner side is provided on the inner side of the tape connection tray 10. Introducing portions 27 and 28 into which the fiber tape core wires 23 and 24 are introduced are provided, respectively. Deriving portions 39 and 40 from which the inner fiber tape core wires 23 and 24 are led out are provided on the front side of the branching tray 11, and fiber cords 31 and 33 are led out from the inner side of the branching tray 11. A portion 41 is provided. With such a configuration, the tape connection tray 10 and the branch tray 11 are prevented from being mixed with different types of optical fibers.

  In this embodiment, since the tray unit 7 has a seven-stage structure, the CATV line, the monitoring line, and the FTTH line can be appropriately wired according to the usage form.

  In this embodiment, the CATV line cords 31a and 31b and the CATV line cord 32a are connected via the optical coupler module 43 and the optical splitter module 45, and the optical coupler module 43 is accommodated in the CATV line tray 12. The optical splitter module 45 is accommodated in the CATV line tray 13. The monitoring line cord 31c and the monitoring line cords 33b and 33c are connected via an optical coupler module 55 and an optical connector adapter 57. The optical coupler module 55 is accommodated in the monitoring line tray 14, and the optical connector adapter 57 is monitored. It is accommodated in the line tray 15. With such a configuration, the necessary number of CATV lines and monitoring lines can be efficiently wired. The FTTH line is less frequently connected and switched than the CATV line and the monitoring line. Therefore, it is appropriate to arrange the FTTH line tray 16 at the lowest stage of the tray unit 7.

  In the first embodiment described above, the optical splitter module 45 having an optical splitter is accommodated on one end side of the CATV line tray 13. However, the present invention is not limited to this configuration. For example, the optical splitter module 45 has a 1 × 2 coupler. Coupler modules may be accommodated on both ends of the CATV line tray 13. The optical coupler module having a 1 × 2 coupler is different in configuration from the optical coupler module 43 having a 2 × 2 coupler.

  In the first embodiment, the CATV line trays 12 and 13 are arranged in the third and fourth stages from the top of the tray unit 7, and the monitoring line trays 14 and 15 are 5 in the top from the tray unit 7. Although it is arranged at the stage and the sixth stage, the form is not particularly limited, and the monitoring line trays 14 and 15 are arranged at the third and fourth stages from the top of the tray unit 7, and the top of the tray unit 7 is arranged. CATV line trays 12 and 13 may be arranged on the fifth and sixth tiers.

  FIG. 15 is a schematic front view showing an optical fiber connection closure according to the second embodiment of the present invention. In FIG. 15, the closure 1 of the present embodiment includes a tray unit 77 instead of the tray unit 7 in the first embodiment.

  As shown in FIG. 16, the tray unit 77 has a tray group 80 including a tape connection tray 10, a branch tray 11, a CATV line tray 78, monitoring line trays 14 and 15, an FTTH line tray 16, and a holding tray 79. is doing.

  The CATV line tray 78 is arranged at the third level from the top of the tray unit 77. The monitoring line trays 14 and 15 are arranged in the fourth and fifth stages from the top of the tray unit 77. The FTTH line tray 16 is arranged at the sixth level from the top of the tray unit 77. The holding tray 79 is arranged at the lowermost stage of the tray unit 77. The tape connection tray 10, the branch tray 11, the monitoring line trays 14 and 15, and the FTTH line tray 16 are the same as those in the first embodiment.

  The CATV line tray 78 is a third tray that accommodates a connecting portion between the CATV line cords 31a and 31b and the CATV line cord 33a. The CATV line cords 31a and 31b and the CATV line cord 33a are connected via an optical splitter 81 (optical component). The optical splitter 81 is, for example, a 1 × 8 splitter. The input unit 81a (see FIG. 18) of the optical splitter 81 is fusion-connected to the CATV line cords 31a and 31b. The input unit 81 a of the optical splitter 81 is an optical fiber on the input side of the optical splitter 81. The output portion 81b (see FIG. 18) of the optical splitter 81 is fusion-connected to the CATV line cord 33a. The output unit 81 b of the optical splitter 81 is an optical fiber on the output side of the optical splitter 81.

  As shown in FIG. 17, a splitter fixing portion 82 for fixing the optical splitter 81 is provided at the center of the CATV line tray 78. The splitter fixing part 82 has, for example, a three-row structure. On one end side of the CATV line tray 78, a fusion fixing part 84 for fixing a fusion connection part 83 (see FIG. 18) between the CATV line cords 31a and 31b and the input part 81a of the optical splitter 81 is provided. . On the other end side of the CATV line tray 78, a fusion fixing part 86 for fixing a fusion connection part 85 (see FIG. 18) between the CATV line cord 33a and the output part 81b of the optical splitter 81 is provided. For example, the fusion fixing portions 84 and 86 have a four-row two-stage structure. Further, an R guide portion 87 is provided adjacent to the splitter fixing portion 82 at the center of the CATV line tray 78. At both ends of the CATV line tray 78, R guide portions 88 are provided adjacent to the fusion fixing portions 84 and 86, respectively.

  An auxiliary tray 90 is connected to the CATV line tray 78 so as to be openable and closable. When the auxiliary tray 90 is closed, the R guide portion 87 is covered with the auxiliary tray 90 (see FIG. 15). The auxiliary tray 90 accommodates optical fibers on the input side and output side of a spare optical splitter used for the purpose of load distribution when transmission traffic increases.

  On the front side of one end of the CATV line tray 78, an introduction part 91 (third introduction part) into which the CATV line cords 31a and 31b are introduced is provided. On the front side of the other end of the CATV line tray 78, an introduction part 92 (third introduction part) into which the CATV line cord 33a is introduced is provided.

  The holding tray 79 is a sixth tray that stores the holding line code 33d. On one end side of the holding tray 79, an empty holding module 93 is accommodated. A holding line cord 33d is connected to the holding module 93 by a connector. An R guide portion 94 is provided in the central portion of the holding tray 79. On the front side of the both ends of the holding tray 79, an introduction section 95 (see FIG. 18) into which the holding line code 33d is introduced is provided.

  As shown in FIG. 18, the CATV line cords 31 a and 31 b are guided from the branch tray 11 to the CATV line tray 78 and are fusion-connected to the input unit 81 a of the optical splitter 81. At this time, the CATV line cords 31 a and 31 b and the input part 81 a of the optical splitter 81 are accommodated in the CATV line tray 78 along the R guide part 88. The CATV line cord 33 a is guided from the branch tray 11 to the CATV line tray 78 and is fusion-connected to the output portion 81 b of the optical splitter 81. At this time, the CATV line cord 33 a is accommodated in the CATV line tray 78 along the R guide part 88, and the output part 81 b of the optical splitter 81 is accommodated in the CATV line tray 78 along the R guide part 87. .

  The hold line cord 33d is guided from the branch tray 11 to the hold tray 79 and connected to the hold module 93 by a connector. At this time, the reserved line code 33 d is accommodated along the R guide portion 94 in the CATV line tray 78.

  As described above, also in this embodiment, the CATV line, the monitoring line, and the FTTH line are accommodated separately in different trays for each line type. As a result, line identification becomes high, and line switching connection work is facilitated.

  In the present embodiment, the CATV line cords 31a and 31b and the CATV line cord 33a are connected via the optical splitter 81, and the supervisory line cord 31c and the supervisory line cords 33b and 33c are optical couplers. The module 55 and the optical connector adapter 57 are connected. With such a configuration, the necessary number of CATV lines and monitoring lines can be efficiently wired. Further, since the reserved line cord 33d is not normally used at the beginning of installation, the reserved tray 79 is preferably arranged at the lowermost stage of the tray unit 77.

  In this embodiment, the CATV line cords 31a and 31b and the input part 81a of the optical splitter 81 are fusion-connected, and the CATV line cord 33a and the output part 81b of the optical splitter 81 are fusion-connected. . With such a configuration, the loss when transmitting the CATV line in the closure 1 is reduced, so that the signal reach can be improved (longer).

  In the second embodiment, the CATV line tray 78 is arranged at the third level from the top of the tray unit 77, and the monitoring line trays 14 and 15 are at the fourth and fifth levels from the top of the tray unit 77. However, the form is not limited to this, and the monitoring line trays 14 and 15 are arranged on the third and fourth stages from the top of the tray unit 77, and the CATV is arranged on the fifth stage from the top of the tray unit 77. A line tray 78 may be arranged.

  The present invention is not limited to the above embodiment. For example, in the above-described embodiment, the number of tray units is seven. However, the tray unit is not particularly limited to this form, and the tray unit includes a tape connection tray, a branch tray, a CATV line tray, a monitoring line tray, and an FTTH line tray. In this case, the number of tray units may be five or six, or may be eight or more.

  DESCRIPTION OF SYMBOLS 1 ... Closure (closure for optical fiber connection), 2 ... Optical cable (1st optical cable), 3 ... Optical fiber tape core wire (1st optical fiber tape core wire), 4 ... Optical cable (2nd optical cable), 5 ... Optical fiber Tape core (second optical fiber ribbon), 6 ... support, 7 ... tray unit, 10 ... tape connection tray (first tray), 11 ... branch tray (second tray), 12 ... CATV line tray ( (Third tray), 13 ... CATV line tray (third tray), 14 ... monitoring line tray (fourth tray), 15 ... monitoring line tray (fourth tray), 16 ... FTTH line tray (fifth tray), 23 ... Internal fiber tape core wire (first internal fiber tape core wire), 24 ... Internal fiber tape core wire (second internal fiber tape core wire), 25, 26 ... Introducing section (first introducing section) 27, 28 ... introduction part (second introduction part), 31 ... fiber cord (first fiber cord), 31a, 31b ... CATV line code (first CATV line code), 31c ... monitoring line code (first Monitoring line cord), 31d... FTTH line code, 32... Branching portion (first branching portion), 33... Fiber cord (second fiber cord), 33a... CATV line cord (second CATV line cord), 33b , 33c... Supervisory line code (second supervisory line code), 33d... Reserved line code, 34... Branching part (second branching part), 39, 40 ... deriving part (first deriving part), 41. Part (second lead-out part), 43 ... optical coupler module (first optical part module), 45 ... optical splitter module (first optical part module), 48, 49 ... introduction part (third introduction part) , 52, 53 ... introduction part (third introduction part), 55 ... optical coupler module (second optical component module), 57 ... optical connector adapter, 59 ... introduction part (third introduction part), 62 ... introduction part (first) 3), 70... Introducing portion (third introducing portion), 77... Tray unit, 78... CATV line tray (third tray), 79 .. Holding tray (sixth tray), 81. , 81a ... input unit, 81b ... output unit, 91, 92 ... introduction unit (third introduction unit).

Claims (7)

An optical fiber connection closure for connecting the first optical fiber ribbon of the first optical cable and the second optical fiber ribbon of the second optical cable,
A support;
A tray unit having a multi-stage structure supported by the support body so as to be able to be pulled out to the near side, and
The tray unit is
A first portion that accommodates a connecting portion between the first optical fiber ribbon and the first inner fiber ribbon and a connecting portion between the second optical fiber ribbon and the second inner fiber ribbon. A tray,
A first branch portion for branching the first inner fiber tape core wire into a plurality of first fiber cords; and a second branch portion for branching the second inner fiber tape core wire into a plurality of second fiber cords. A second tray for storage;
A third tray for accommodating a connecting portion between a first CATV line cord of the plurality of first fiber cords and a second CATV line cord of the plurality of second fiber cords;
A fourth tray for accommodating a connecting portion between a first monitoring line cord of the plurality of first fiber cords and a second monitoring line cord of the plurality of second fiber cords;
A fifth tray for accommodating a connection portion between the FTTH line cord and the FTTH-dedicated optical fiber cord among the plurality of first fiber cords;
Have
The first tray, the second tray, the third tray, the fourth tray, and the fifth tray are optical fiber connection closures that are rotatable in the vertical direction. The first tray is arranged at the uppermost stage of the tray unit,
The second tray is arranged one step below the first tray,
The third tray and the fourth tray are disposed on the lower side of the second tray,
The optical fiber connection closure according to claim 1, wherein the fifth tray is disposed on a lower side of the third tray and the fourth tray. On the front side of the first tray, a first introduction part into which the first optical fiber ribbon and the second optical fiber ribbon are introduced is provided,
On the back side of the first tray, there is provided a second introduction part into which the first internal fiber tape core wire and the second internal fiber tape core wire are introduced,
On the front side of the second tray, a first lead-out portion from which the first internal fiber tape core wire and the second internal fiber tape core wire are led out is provided,
A second lead-out portion from which the first fiber cord and the second fiber cord are led out is provided on the back side of the second tray,
3. The light according to claim 2, wherein a third introducing portion into which the first fiber cord and the second fiber cord are introduced is provided on a front side of the third tray, the fourth tray, and the fifth tray. Closure for fiber connection.   4. The optical fiber connection closure according to claim 2, wherein the tray unit has a seven-stage structure. The number of stages of the third tray and the fourth tray is two stages,
The first CATV line cord and the second CATV line cord are connected via a plurality of types of first optical component modules having different configurations,
The plurality of types of first optical component modules are housed in the third trays of different stages,
The first monitoring line cord and the second monitoring line cord are connected via a second optical component module and an optical connector adapter,
The second optical component module and the optical connector adapter are housed in the fourth tray at different stages,
The optical fiber connection closure according to claim 4, wherein the fifth tray is disposed at a lowermost stage of the tray unit. The number of stages of the third tray is one stage,
The first CATV line cord and the second CATV line cord are connected via an optical component,
The number of stages of the fourth tray is two stages,
The first monitoring line cord and the second monitoring line cord are connected via an optical component module and an optical connector adapter,
The optical component module and the optical connector adapter are accommodated in the fourth tray in different stages,
5. The optical fiber connection closure according to claim 4, wherein a sixth tray in which a reserved line cord among the plurality of second fiber cords is accommodated is disposed at a lowermost stage of the tray unit. The first CATV line cord and the input part of the optical component are fusion-connected,
The optical fiber connection closure according to claim 6, wherein the second CATV line cord and the output part of the optical component are fusion-connected.

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