JP2013113927A - Optical fiber housing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical fiber housing method that allows housing optical fiber conductors of different conductor types in a fiber housing tray with excellent space efficiency while preventing mixing-up.SOLUTION: A conductor connection tray 10 has conductor housing portions 11-13 arranged in line in a longer direction. The conductor housing portion 11 houses a connection part of an optical fiber conductor 30 and an input optical fiber conductor 28 of an optical splitter 24. The conductor housing portion 12 houses the optical fiber conductor 28 and an output optical fiber conductor 29 of the optical splitter 24. The conductor types of the optical fiber conductors 28, 29 are different, and the optical fiber conductor 28 is not wound more than once. The conductor housing portion 13 houses a connection part of the output optical fiber conductor 29 and an optical fiber conductor 5. The conductor types of the optical fiber conductors 5, 29 are the same or different, and the optical fiber conductor 29 is not wound more than once.

Description

  The present invention relates to an optical fiber housing method for housing an optical fiber core wire in a fiber housing tray of an optical fiber connection closure.

  When constructing an optical transmission system using an optical fiber, the optical fiber core wire on the trunk line side and the optical fiber core wire on the subscriber side are connected by an optical fiber connection closure. Generally, the optical fiber core wire on the main line side is a tape core wire, and the optical fiber core wire on the subscriber side is a single fiber. The tape core can be connected to a single fiber by performing single fiber separation or termination by connecting to a pre-reinforced single fiber that is called a branched fiber.

  In addition, in a PDS (Passive Double Star) line, a connection form in which an optical splitter called an optical splitter is interposed between an optical fiber core on the trunk side and an optical fiber core on the subscriber side is common. The optical splitter branches the optical signal to the output side via the waveguide chip. The core type on the input side of the optical splitter is a single fiber, but the core type on the output side of the optical splitter may be a tape core or a single core fiber.

  Furthermore, for the optical fiber core on the subscriber side, the linear is a 0.25 mm single fiber, the linear is a 0.5 mm single fiber, or a tape core, There are multiple core types.

  When optical fiber cores of different core types are mixed in the same storage area of the fiber storage tray, it is difficult to take out only the necessary optical fiber cores. Further, since the bending rigidity of the optical fiber itself varies depending on the type of the core, depending on the case, a bending at a level where desired optical transmission characteristics cannot be obtained may occur locally.

  In order to avoid such a problem, conventionally, a plurality of fiber storage trays are stacked, and optical fiber cores having different core types are divided for each layer of the fiber storage tray. For example, in the optical fiber connection closure described in Patent Document 1, a lower extension termination tray, a DS / R / TD termination tray, a drop termination tray, and a splitter tray are arranged in a stacked state in the optical closure.

JP 2007-121603 A

  However, the following problems exist in the prior art. That is, since the optical fiber cores of different core types are stored in different fiber storage trays, the number of optical splitters arranged in the optical fiber connection closure and the connection portion between the optical fiber cores are limited. Will be limited.

  The objective of this invention is providing the optical fiber accommodation method which can be efficiently accommodated in a fiber accommodation tray so that the optical fiber core wire from which a core type differs may not be mixed.

  The present invention provides a fiber accommodation tray mounted on an optical fiber connection closure for connecting a first optical fiber core wire of a first optical cable and a second optical fiber core wire of a second optical cable, and having a plurality of core wire housing portions. An optical fiber housing method for housing a plurality of types of optical fiber cores including a first optical fiber core wire and a second optical fiber core wire, wherein one or two types of optical fiber core wires are provided in each core wire housing portion. When accommodating two types of optical fiber cores in the core wire accommodating portion, at least one of the two types of optical fiber core wires is accommodated so as not to be wound more than once. is there.

  As described above, in the optical fiber accommodation method of the present invention, one type or two types of optical fiber cores are accommodated in each of the core wire accommodating portions of the fiber accommodation tray, so that it differs depending on the type of the optical fiber core wire. Since it is not necessary to store the optical fiber cores in the fiber storage tray, it is possible to efficiently store the optical fiber cores having different core types in the fiber storage tray. Further, even when only one type of optical fiber core is accommodated in the core wire accommodating portion, or when two types of optical fiber core wires are accommodated in the core wire accommodating portion, at least one of the two types of optical fiber core wires is required. By accommodating so that it may not wind more than 1 round, mixing of the optical fiber core wire from which the core wire type in a fiber accommodation tray differs can be suppressed.

  Preferably, the fiber storage tray has at least three core wire storage portions arranged in a line, and a plurality of types of optical fiber cores are directed from the first optical fiber core side toward the second optical fiber core wire side. One or two types of optical fiber core wires are accommodated in each core wire accommodating portion so as to be sequentially passed to each core wire accommodating portion along the arrangement direction of the core wire accommodating portions. In this case, for example, even if a connection configuration having an optical splitter is adopted, optical fiber cores having different core types can be accommodated in the fiber storage tray with good space efficiency, and the core types in the fiber storage tray can be reduced. Mixing of different optical fiber cores can be suppressed. In addition, the wiring of the optical fiber core wire in the fiber storage tray is prevented from becoming complicated.

  Preferably, the fiber accommodation tray is provided with a connection portion attachment portion for attaching a connection portion between different optical fiber cores so as to extend in the depth direction of the fiber accommodation tray. In this case, for example, in a structure in which the optical fiber core wire is introduced from the back side (back side) of the fiber storage tray, the length of the optical fiber core wire from the optical fiber core wire introduction portion to the connection portion mounting portion is sufficient. Can be shortened.

  ADVANTAGE OF THE INVENTION According to this invention, it can accommodate in a fiber accommodation tray with space efficiency so that the optical fiber core wire from which a core wire type differs may not be mixed. Thereby, it becomes possible to easily take out only the necessary types of optical fiber cores from the fiber storage tray. In addition, since the local bending of the optical fiber core due to the difference in bending rigidity for each type of optical fiber core is prevented, it is possible to ensure the desired optical transmission characteristics of the optical fiber core. Become.

It is a perspective view which shows the closure for optical fiber connection with which one Embodiment of the optical fiber accommodation method concerning this invention is applied. It is a perspective view which shows the part except the main tray in the closure for optical fiber connection shown in FIG. It is a perspective view of the core wire connection tray group shown in FIG. It is a top view which shows the wiring form of the optical fiber core wire in the core wire connection tray shown in FIG. It is a perspective view which shows the state which the core wire passage tray incline upwards in the closure for optical fiber connection shown in FIG. FIG. 6 is a perspective view showing a state in which the lower extension tray is opened with respect to the core wire passing tray in the optical fiber connection closure shown in FIG. 5. FIG. 2 is a perspective view showing a state where main trays are fixed to a frame body by a tray pressing plate in the optical fiber connection closure shown in FIG. 1.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, a preferred embodiment of an optical fiber accommodation method according to the invention will be described in detail with reference to the drawings.

  FIG. 1 is a perspective view showing an optical fiber connection closure to which an embodiment of an optical fiber accommodation method according to the present invention is applied. In the figure, an optical fiber connection closure (hereinafter simply referred to as a closure) 1 according to the present embodiment is built in an optical fiber core wire 3 built in a main trunk cable 2 on a station side and a branch cable 4 on a subscriber side in the space. This is a device for connecting the optical fiber core 5 and is used in a PDS (Passive Double Star) line system.

  The closure 1 includes a frame body 6 fixed to a housing (not shown) into which the main trunk main cable 2 and the branch cable 4 are introduced. As shown in FIG. 2, a tray fixing base plate 7 is attached to the center of the frame body 6. In addition, a tray fixing base plate 8 is attached to each of the left and right sides of the tray fixing base plate 7 in the frame body 6.

  A plurality (four in this case) of core wire connection tray groups 9 are fixed to the tray fixing base plate 7. As shown in FIG. 3, the core wire connection tray group 9 includes a plurality of (here, four) core wire connection trays (fiber accommodation trays) 10 that can be opened and closed.

  The core wire connection tray 10 has the core wire accommodating portions 11 to 13 arranged in a line in the longitudinal direction. The core wire housing portion 12 is provided between the core wire housing portions 11 and 13.

  A core wire introducing portion 14 for introducing an optical fiber core wire is provided at the back side (back side) end of the core wire housing portion 11. A connecting portion mounting portion 15 for positioning and mounting a fusion splicing portion S1 (see FIG. 4) of different optical fiber core wires is provided in a portion of the core wire storing portion 11 adjacent to the core wire storing portion 12. It has been. The connection portion mounting portion 15 is provided so as to extend in the depth direction of the core wire connection tray 10. The core wire accommodating portion 11 is provided with a surplus length guide portion 16 for guiding the optical fiber core wire when the extra length of the optical fiber core wire is wound and accommodated. The core wire accommodating portion 11 is provided with a plurality of pressing plates 17 for pressing the optical fiber core wires.

  A core wire introducing portion 18 for introducing an optical fiber core wire is provided at the back end of the core wire housing portion 13. A connecting portion mounting portion 19 for positioning and mounting the fusion splicing portion S2 (see FIG. 4) of different optical fiber core wires is provided in a portion adjacent to the core wire housing portion 12 in the core wire housing portion 13. It has been. The connection portion mounting portion 19 is provided so as to extend in the depth direction of the core wire connection tray 10. The core wire accommodating portion 13 is provided with a surplus length guide portion 20 for guiding the optical fiber core wire when the extra length of the optical fiber core wire is wound and accommodated. The core wire accommodating portion 13 is provided with a plurality of pressing plates 21 for pressing the optical fiber core wires.

  A core wire guide portion 22 for guiding the optical fiber core wire between the core wire storage portions 11 and 12 is provided at the back end of the boundary portion between the core wire storage portions 11 and 12. A core wire guide portion 23 for guiding the optical fiber core wire between the core wire storage portions 12 and 13 is provided at the back end of the boundary portion of the core wire storage portions 12 and 13.

  The core wire accommodating portion 12 is provided with a splitter mounting portion 25 for positioning and mounting the optical splitter 24 (see FIG. 4). The splitter mounting portion 25 is disposed in the vicinity of the back end portion of the core wire housing portion 12. The core wire accommodating portion 12 is provided with a surplus length guide portion 26 for guiding the optical fiber core wire when the surplus length of the optical fiber core wire is wound and accommodated. The core wire accommodating portion 12 is provided with a plurality of pressing plates 27 for pressing the optical fiber core wires.

  As shown in FIG. 4, the optical splitter 24 is a (1 × 8) type optical branching device that branches one optical signal into eight optical signals, and includes one input optical fiber core 28 and a plurality of optical fibers. And an output optical fiber core wire 29. The input optical fiber core 28 is a single-core optical fiber core whose diameter is, for example, 0.25 mm. The allowable bending radius R of the input optical fiber core 28 is 30 mm or 15 mm. The output optical fiber core 29 is formed of, for example, a four-core fiber ribbon. The output optical fiber core 29 may be a reinforced single-core optical fiber, and the allowable bending radius R in this case is 30 mm or 15 mm.

  A plurality of types of optical fiber core wires are accommodated in the core wire housing portions 11 to 13 in order along the arrangement direction of the core wire housing portions 11 to 13 from the main trunk cable 2 side to the branch cable 4 side. Is done. Specifically, a plurality of types of optical fiber cores positioned on the downstream side of the optical fiber core wire 3 are accommodated in the core wire accommodating portions 11 to 13 as follows. Here, the optical fiber core 3 is a four-fiber optical fiber ribbon.

  The core wire accommodating portion 11 accommodates a connection portion between one optical fiber core wire 30 extending from the main trunk main cable 2 and the input optical fiber core wire 28 of the optical splitter 24. Here, the optical fiber core wire 30 is formed by separating the optical fiber core wire 3 (four-core optical fiber tape core wire) from a single core. That is, the optical fiber core wire 30 is a single-core optical fiber core wire. The optical fiber core wire 30 has a wire diameter of 0.25 mm, and the optical fiber core wire 30 has an allowable bending radius R of 30 mm. Then, one of the plurality of optical fiber cores 30 is cut.

  In addition, the optical splitter 24 is attached to the splitter attaching portion 25 of the core wire accommodating portion 12. Then, the cut optical fiber core 30 and the input optical fiber core 28 of the optical splitter 24 are fusion-connected.

  Then, the input optical fiber core 28 is wound along the extra length guide portion 16 for a necessary number of turns, and the optical fiber core wire 30 and the input optical fiber core wire 28 are fused and connected to the connection portion S1. 15 is attached. Since the connection part mounting part 15 is provided in the part adjacent to the core wire accommodation part 12 in the core wire accommodation part 11 so as to extend in the depth direction of the core wire connection tray 10, the connection part attachment part 15 is attached from the core wire introduction part 14 The length of the optical fiber core 30 up to the section 15 can be shortened to the minimum necessary. Thus, the single-core optical fiber cores 28 and 30 having the same core type are accommodated in the core wire accommodating portion 11.

  The core wire accommodating portion 12 accommodates the input optical fiber core wire 28 and the output optical fiber core wire 29 of the optical splitter 24. The splitter mounting portion 25 to which the optical splitter 24 is mounted is provided in the vicinity of the back end portion of the core wire housing portion 12. For this reason, the length of the input optical fiber core wire 28 from the core wire introducing portion 22 to the splitter mounting portion 25 is sufficiently short. The output optical fiber core wire 29 is wound along the extra length guide portion 26 for a necessary turn. At this time, since the length of the input optical fiber core 28 is sufficiently short, mixing of the optical fiber cores 28 and 29 having different core types in the core housing portion 12 is suppressed, and the optical fiber cores 28 and 29 are taken out. There is no difficulty.

  The core wire accommodating portion 13 accommodates connection portions between the plurality of output optical fiber core wires 29 and the plurality of optical fiber core wires 5. The optical fiber core 5 may be formed of a four-core fiber tape core like the output optical fiber core 29, or may be a single-core optical fiber core with a wire diameter of 0.5 mm or 0.25 mm. May be.

  First, the output optical fiber core wire 29 and the optical fiber core wire 5 are fused and connected, and the fusion splicing portion S2 is attached to the connection portion attachment portion 19, and the output optical fiber core wire 29 and the optical fiber core wire 5 are connected. It winds only the required circumference | surroundings along the surplus length guide part 20. FIG. At this time, any one of the output optical fiber core wire 29 and the optical fiber core wire 5 is not wound more than one turn along the extra length guide portion 20. For this reason, mixing of the optical fiber core wires 5 and 29 having different core wire types in the core wire housing portion 13 is suppressed, and the optical fiber core wires 5 and 29 are not easily taken out.

  Returning to FIG. 1, auxiliary core wire connection trays 31 and 32 are disposed below the core wire connection tray group 9. As shown in FIG. 2, the auxiliary core wire connection trays 31 and 32 are attached to the tray fixing base plate 7 so as to be rotatable in the vertical direction.

  On the upper side of the core wire connection tray group 9, a core wire passing tray 33 is disposed. The core wire passing tray 33 accommodates the plurality of optical fiber core wires 3 exposed by removing the jacket of the intermediate portion of the main trunk main cable 2 and the optical fiber core wires 30 obtained by separating the optical fiber core wires 3 from each other. It is a tray. Among the plurality of optical fiber cores 30 separated from each other, some of the optical fiber cores 30 are cut and connected to the optical splitter 24, and the remaining optical fiber cores 30 are connected to the core wire passing tray. 33 is accommodated so as to pass as it is.

  The core wire passing tray 33 is attached to each tray fixing base plate 8 (see FIG. 2) so as to be rotatable in the vertical direction. Thereby, the core wire passing tray 33 can be tilted upward with respect to the core wire connecting tray group 9 as shown in FIG. At this time, the core wire passing tray 33 is configured to be able to be held in a state of being inclined upward by about 30 degrees with respect to the core wire connecting tray group 9. As a result, a work space is formed above the core wire connection tray group 9, and a mechanism for pulling out the core wire connection tray group 9 toward the front side in order to secure a work space for the core wire connection tray 10. It is not necessary to provide. Each tray fixing base plate 8 is provided with a support arm 36 for keeping the core wire passing tray 33 horizontal with respect to the core wire connecting tray group 9.

  When the core wire passing tray 33 is tilted upward, the core wire introducing portion 34 of the core wire passing tray 33 comes closer to the main cable 2, so that the optical fiber core wire 3 is not pulled and the The influence on the fiber core wire 3 is small.

  As shown in FIG. 6, a lower extension tray 37 is provided below the core wire passage tray 33 so as to be openable and closable around the rotation axis on the back side (back side) with respect to the core wire passage tray 33. For example, when the optical splitter 24 is removed because the subscriber has canceled the optical communication contract, the connection between the input optical fiber core 28 and the optical fiber core 30 of the optical splitter 24 is removed, and the lower extension is performed. That is, the fiber core wire 30 is reconnected to the original optical fiber core wire 30, that is, the cut optical fiber core wires 30 are reconnected. The lower extension tray 37 is a tray for accommodating a reconnecting portion between the optical fiber cores 30 subjected to the lower extension.

  On the left or right side of the core wire connection tray group 9, an extra length accommodation pocket for accommodating the extra length of the optical fiber core wire 30 existing between the core wire connection tray 10 and the core wire passage tray 33. 43 is provided. The extra length accommodation pocket 43 is provided on the side corresponding to the upstream side of the closure 1. Here, assuming that the left side of the closure 1 is the upstream side, the extra length accommodation pocket 43 is provided on the left side of the core wire connection tray group 9.

  The extra length accommodation pocket 43 is detachably attached to a pocket base plate 44 that forms a part of the tray fixing base plate 8 and the pocket base plate 44, and is disposed between the core wire connection tray 10 and the core wire passage tray 33. And a pressing plate 45 for pressing the optical fiber core wire 30 existing on the pocket base plate 44. Thereby, the optical fiber core wire 30 can be protected.

  In addition, since the pressing plate 45 can be attached to and detached from the pocket base plate 44, the pressing plate 45 can be replaced according to the position on the upstream side of the closure 1, so that there is only one pressing plate 45. It's enough.

  As shown in FIG. 7, the auxiliary core wire connection tray 32 moves the core wire connection tray group 9, the auxiliary core wire connection trays 31 and 32, the core wire passage tray 33 and the lower extension tray 37 with respect to the frame body 6. A tray pressing plate 48 is attached for fixing so as not to exist.

  As described above, in the present embodiment, a plurality of types of optical fiber core wires between the main trunk cable 2 and the branch cable 4 are connected to the core wire storage portions 11 to 13 of the core wire connection tray 10. It accommodates so that it may cross in order in the arrangement | sequence direction of -13. Specifically, the single-core optical fiber cores 28 and 30 that are the same core type and the fusion splicing portion S1 of both are stored in the core storage section 11, and different core types are stored in the core storage section 12. The optical fiber core wires 28 and 29 are accommodated together with the optical splitter 24, and the optical fiber core wires 5 and 29 of the same core wire type or different core wire types and the fusion splicing portion S2 of both are stored in the core wire housing portion 13. Thereby, since it is not necessary to accommodate an optical fiber core wire in a different core wire connection tray for each core wire type, a plurality of types of optical fiber core wires can be accommodated in the core wire connection tray 10 in a space efficient manner.

  Further, since one optical splitter 24 and two fusion splicing portions S1 and S2 are accommodated in one core connection tray 10, a plurality of core connection trays 10 are arranged in a limited space in the closure 1. Even in this case, many (here, 16) optical splitters 24 can be mounted. Further, since the accommodating layer is divided for each optical splitter 24, the discrimination and workability are improved.

  At this time, both the optical fiber core 28 accommodated in the core wire accommodating portion 12 and the optical fiber core wire 29 accommodated in the core wire accommodating portion 13 are wound by less than one turn. For this reason, in spite of the two types of optical fiber cores 28 and 29 being accommodated in the core wire accommodating portion 12, the mixing of the optical fiber core wires 28 and 29 is suppressed, so that the appearance is improved. As described above, the optical fiber core wires 28 and 29 can be easily taken out from the core wire housing portion 12. Further, even if the types of the optical fiber cores 5 and 29 accommodated in the core wire accommodating portion 13 are different, the appearance of the optical fiber core wires 5 and 29 can be suppressed. In addition, the optical fiber core wires 5 and 29 can be easily taken out from the core wire housing portion 13.

  Further, since the bending rigidity of the optical fiber core wire changes when the core wire types are different, when two types of optical fiber core wires having different core wire types are accommodated in the same core wire accommodating portion, the optical fiber core wire Local bending may occur. However, since the optical fiber core 28 accommodated in the core wire accommodating portion 12 and the optical fiber core wire 29 accommodated in the core wire accommodating portion 13 are not wound more than one turn, the optical fiber core wire is not wound. Local bending of 5, 28, 29 is unlikely to occur. Thereby, the desired optical transmission characteristic of the optical fiber core wires 5, 28, 29 can be ensured.

  The present invention is not limited to the above embodiment. For example, in the said embodiment, although the core wire connection tray 10 has the three core wire accommodating parts 11-13 arrange | positioned in a line, as a core wire connection tray to be used, it has a some core wire accommodating part. Anything is fine.

  The closure 1 of the above embodiment is a connection form in which the optical splitter 24 is interposed between the optical fiber core wire 3 of the main trunk cable 2 and the optical fiber core wire 5 of the branch cable 4. The present invention is applicable as long as the optical fiber core wire 3 of the main trunk cable 2 and the optical fiber core wire 5 of the branch cable 4 are connected.

DESCRIPTION OF SYMBOLS 1 ... Optical fiber connection closure, 2 ... Trunk main cable (1st optical cable), 3 ... Optical fiber core wire (1st optical fiber core wire), 4 ... Branch cable (2nd optical cable), 5 ... Optical fiber core wire (Second optical fiber core), 10 ... core wire connection tray (fiber housing tray), 11-13 ... core wire housing section, 15, 19 ... connection section mounting section, 24 ... optical splitter, 28 ... input optical fiber core Wire, 29 ... output optical fiber core wire, 30 ... optical fiber core wire (first optical fiber core wire), S1, S2 ... fusion splicing part.

Claims (3)

The first light is mounted on a fiber receiving tray that is mounted on an optical fiber connection closure that connects the first optical fiber core of the first optical cable and the second optical fiber core of the second optical cable, and has a plurality of core wire receivers. An optical fiber housing method for housing a plurality of types of optical fiber core wires including a fiber core wire and the second optical fiber core wire,
While accommodating one type or two types of optical fiber cores in each core wire storage part,
In the case where two types of optical fiber cores are stored in the core wire storage section, at least one of the two types of optical fiber core wires is stored so as not to be wound more than once. . The fiber accommodating tray has at least three core wire accommodating portions arranged in a row,
The plurality of types of optical fiber core wires sequentially reach the respective core wire housing portions along the arrangement direction of the core wire housing portions from the first optical fiber core wire side toward the second optical fiber core wire side. The optical fiber housing method according to claim 1, wherein the one type or two types of optical fiber core wires are housed in each of the core wire housing portions. 2. The fiber receiving tray is provided with a connecting portion mounting portion for mounting a connecting portion between different optical fiber core wires so as to extend in a depth direction of the fiber receiving tray. Or the optical fiber accommodation method of 2.

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