JP5425875B2 - Optical fiber connection closure and optical fiber connection method - Google Patents

Description

  The present invention relates to an optical fiber connection closure for connecting, for example, a station side optical cable and a subscriber side optical cable, and an optical fiber connection method.

  As a conventional optical fiber connection closure, for example, as described in Patent Document 1, a guide member fixed to a base, a support member fixed to the guide member via a cover plate, There is known one provided with a plurality of fiber storage trays which are fixed to a support member in a swingable manner and which store optical fibers.

Special Table 2000-505567

  However, in the above prior art, when optical fiber cores having different core types are accommodated in the same optical fiber accommodation tray, the optical fiber core wires are mixed in the optical fiber accommodation tray. It becomes difficult to take out only the fiber core. Further, since the bending stiffness 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.

  An object of the present invention is to provide an optical fiber connection closure and an optical fiber connection method capable of suppressing a mixture of optical fiber cores having different core types in a fiber receiving tray.

The present invention provides an optical fiber connection closure for connecting a first optical fiber core wire of a first optical cable introduced from below and a second optical fiber core wire of a second optical cable introduced from below; And a plurality of types of fiber storage trays attached to the tray fixing base so as to be rotatable. The plurality of types of fiber storage trays are exposed by removing the outer cover of the intermediate portion of the first optical cable. A core-passing tray for accommodating the first optical fiber core, a third optical fiber core formed by cutting the first optical fiber core and separating the single core, and an input optical fiber core of the optical splitter A first connection tray for accommodating the connection portion with the optical splitter, and a first connection tray for accommodating the connection portion between the output optical fiber core wire and the second optical fiber core wire of the optical splitter together with the optical splitter. Have a connection tray, first connection tray is capable of accommodating a connecting portion between the input optical fiber and the third optical fiber by a plurality minute, second connecting trays, third optical fiber There are multiple sheets corresponding to the number of connection parts between the optical fiber core and the input optical fiber, and one set of the first connection tray and multiple sets of the second connection tray can be rotated as a set to the tray fixing base. The first connection tray and each of the second connection trays can be opened and closed with each other, and an upper housing portion for housing the output optical fiber core wire is provided in the upper region of the second connection tray. The lower region of the second connection tray is provided with a lower housing portion for housing the second optical fiber core wire .

  As described above, in the optical fiber connection closure of the present invention, the first optical fiber core wire is accommodated in the core wire passing tray, and the third light formed by cutting the first optical fiber core wire and separating the single optical fiber. The fiber core wire and the input optical fiber core wire of the optical splitter are accommodated in the first connection tray, and the input optical fiber core wire, the output optical fiber core wire and the second optical fiber core wire of the optical splitter are accommodated in the second connection tray. Will be. In other words, since only the single optical fiber core wire is accommodated in the first connection tray, optical fiber core wires having different core types are not mixed in the first connection tray. Further, when the output optical fiber core wire and the second optical fiber core wire of the optical splitter are the same core wire type, for example, by shortening the length of the input optical fiber core wire accommodated in the second connection tray In the second connection tray, it is difficult to mix optical fiber cores having different core types. Thereby, mixing of the optical fiber core wire from which the core wire type in a fiber accommodation tray differs can be suppressed.

  For example, when the first optical fiber core is an optical fiber ribbon, a single third optical fiber core is accommodated in the first connection tray by the number of optical fiber tape cores, and the second By setting the number of connection trays to be equal to the number of optical fiber ribbons, a set of first connection trays and second connection trays can be sorted for each first optical fiber.

Further , even if the output optical fiber core wire and the second optical fiber core wire of the optical splitter are different from each other, the accommodation regions of the output optical fiber core wire and the second optical fiber core wire are located above and below the second connection tray. Since they are divided, the second connection tray does not mix both. Thereby, mixing of the optical fiber core wire from which the core wire type in a fiber accommodation tray differs can be suppressed further.

  Further, preferably, on both sides of the tray fixing base, there are provided core wire guide portions for guiding different types of optical fiber core wires separately from each other.

  In this case, since the optical fiber cores of different core types are arranged in a state where they are arranged by the core guide part, it is possible to prevent the optical fiber cores from being congested outside the fiber storage tray. it can.

  The optical fiber connection method of the present invention includes a step of preparing the above-described optical fiber connection closure, and the first optical fiber core wire exposed by removing the outer cover of the intermediate portion of the first optical cable and a single core. The step of separating and forming the third optical fiber core, the step of accommodating the first optical fiber core wire in the core wire passing tray, and the third optical fiber core wire and the input optical fiber core wire of the optical splitter are connected. And connecting the connection portion together with the third optical fiber core and the input optical fiber core in the first connection tray, connecting the output optical fiber core of the optical splitter and the second optical fiber core, And a step of accommodating the connection portion in the second connection tray together with the optical splitter, the output optical fiber core wire, and the second optical fiber core wire.

  Thus, in the optical fiber connection method of the present invention, as described above, since only the single optical fiber core wire is accommodated in the first connection tray, the optical fibers having different core types in the first connection tray. There is no mixture of cores. Further, as described above, when the output optical fiber core wire and the second optical fiber core wire of the optical splitter are of the same core wire type, for example, the length of the input optical fiber core wire accommodated in the second connection tray By shortening, it becomes difficult to mix optical fiber core wires of different core wire types in the second connection tray. Thereby, mixing of the optical fiber core wire from which the core wire type in a fiber accommodation tray differs can be suppressed.

  ADVANTAGE OF THE INVENTION According to this invention, mixing of the optical fiber core wire from which the core wire type in a fiber accommodation tray differs can be suppressed. Thereby, it becomes possible to easily take out only the necessary types of optical fiber cores from the fiber storage tray. Further, since local bending of the optical fiber core wire is less likely to occur, it is possible to ensure the transmission characteristics of the optical fiber core wire.

1 is a perspective view showing an embodiment of an optical fiber connection closure according to the present invention. It is a perspective view which shows the state in which the multiple types of fiber accommodation tray shown in FIG. 1 is rotatably attached to the tray fixed base. It is a top view which shows the state in which the multiple types of fiber accommodation tray shown in FIG. 2 is rotatably attached to the tray fixed base. It is a figure which shows the state in which the optical fiber core wire was accommodated in the core wire passage tray shown in FIG. FIG. 3 is a perspective view of a connection tray group illustrated in FIG. 2. It is a figure which shows the state in which the optical splitter and the optical fiber core wire were accommodated in the connection tray of the connection tray group shown in FIG. It is a figure which shows the state in which the optical fiber core wire was accommodated in the drop tray shown in FIG.

  DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of an optical fiber connection closure and an optical fiber connection method according to the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a perspective view showing an embodiment of an optical fiber connection closure according to the present invention. In the figure, an optical fiber connection closure (hereinafter simply referred to as a closure) 1 according to the present embodiment is installed in the basement of a manhole or the like, and is built into a main trunk cable 2 on the station side and a subscriber side. The optical fiber core 5 incorporated in the branch cable 4 and the optical fiber core 7 incorporated in the drop cable 6 are connected to each other. The closure 1 is used in a PDS (Passive Double Star) line system.

  The closure 1 includes a closure body 8 that is accommodated in a case (not shown). The closure main body 8 is formed with a plurality of cable introduction holes 8 a through which the main line main cable 2, the branch cable 4 and the drop cable 6 introduced from below the closure 1 pass. The main trunk cable 2, the branch cable 4 and the drop cable 6 introduced into the closure 1 are fixed to the closure body 8 by fixing means (not shown).

  A tray fixing base 9 is provided on the upper portion of the closure body 8. As shown in FIGS. 2 and 3, a pair of outer lanes 10 and a pair of inner lanes 11 are provided on the upper surface of the tray fixing base 9. The outer lane 10 has a plurality of pin receiving recesses 10a formed at an equal pitch, and the inner lane 11 has a plurality of pin receiving recesses 11a formed at an equal pitch.

  As shown in FIGS. 1 to 3, the tray fixing base 9 has a plurality of core wire passing trays 12, a plurality of sets of connection tray groups 13, and a plurality of drop trays 14 in a detachable and standing state. It is pivotally attached.

  As shown in FIG. 4, the core wire passing tray 12 is a fiber storage tray for storing the exposed optical fiber core wire 3 by removing the jacket of the intermediate portion of the main trunk cable 2. The optical fiber core wire 3 is, for example, a four-core optical fiber tape core wire. The optical fiber cores 3 accommodated in the core wire passing tray 12 include those that pass through the core wire passing tray 12 as they are without being cut, and those that are cut once and reconnected. By cutting such an optical fiber core wire 3 (four-core optical fiber tape core wire) and separating the single cores, four single-core optical fiber cores 16 are formed. These optical fiber core wires 16 are led out from the core wire passage tray 12.

  A support portion 15 having a pair of pins 15 a that engage with the pin receiving recess 10 a of the outer lane 10 is provided at the lower end portion (base end portion) of the core wire passing tray 12. By fitting these pins 15 a into the pin receiving recesses 10 a, the core wire passing tray 12 can be rotated around the rotation axis along the upper surface of the tray fixing base 9 while standing with respect to the tray fixing base 9. . The core wire passing tray 12 is provided with a plurality of pressing plates 18 for pressing the optical fiber core wires 3.

  As shown in FIG. 5, the connection tray group 13 is a set of five sheets having one connection tray 19 and four connection trays 20. The connection tray 19 and each connection tray 20 are connected to each other so as to be openable and closable.

  As shown in FIG. 6A, the connection tray 19 is a fusion splicing portion S1 between an optical fiber core wire 16 led out from the core wire passage tray 12 and an input optical fiber core wire 22 of an optical splitter 21 (described later). Is a fiber storage tray for storing the optical fiber core 16 and the input optical fiber core 22 together. The input optical fiber core wire 22 is a single core optical fiber core wire. The connection tray 19 accommodates four optical fiber cores 16 and four input optical fiber cores 22 connected to these optical fiber cores 16.

  A support portion 23 having a pair of pins 23 a that engage with the pin receiving recesses 10 a of the outer lane 10 is provided at the lower end portion (base end portion) of the connection tray 19. By fitting these pins 23 a into the pin receiving recesses 10 a, the connection tray group 13 can turn around the rotation axis along the upper surface of the tray fixing base 9 while standing with respect to the tray fixing base 9.

  In the upper region of the connection tray 19, a plurality (eight in this case) of connecting portion mounting portions 24 to which the fusion splicing portions S <b> 1 between the optical fiber core wires 16 and the input optical fiber core wires 22 are mounted are provided. . The connection tray 19 is provided with a plurality of pressing plates 25 for pressing the optical fiber core wire 16 and the input optical fiber core wire 22.

  The connection tray 20 is attached to the support portion 23 of the connection tray 19 so as to be rotatable about a rotation axis substantially parallel to a rotation axis of the connection tray 19 with respect to the tray fixing base 9 (an axis formed by a pair of pins 23a). It is supported. Thereby, the connection tray 19 and each connection tray 20 can be opened and closed with respect to each other.

  As shown in FIG. 6B, the connection tray 20 includes a (1 × 8) type optical splitter 21, an output optical fiber core 26 of the optical splitter 21, and an optical fiber extending from the outer sheath of the branch cable 4. This is a fiber accommodation tray for accommodating the fusion splicing portion S2 with the core wire 5 together with the output optical fiber core wire 26, the optical fiber core wire 5 and the input optical fiber core wire 22 derived from the connection tray 20.

  The (1 × 8) type optical splitter 21 is an optical branching device that branches one optical signal into eight optical signals. A splitter mounting portion 27 to which the optical splitter 21 is mounted is provided at the upper end portion of the connection tray 20.

  The output optical fiber core 26 is, for example, a four-fiber optical fiber ribbon. The optical fiber core wire 5 is a single-core optical fiber. Therefore, the connection tray 20 accommodates the two output optical fiber cores 26, the eight optical fiber core wires 5, and the two fusion splicing portions S2. A part of the eight optical fiber core wires 5 may be cut out and led out from the connection tray 20.

  In the upper region of the connection tray 20, an upper housing portion 20 a for housing the output optical fiber core wire 26 of the optical splitter 21 is formed, and in the lower region of the connection tray 20, the optical fiber core wire 5 is housed. A lower housing portion 20b is formed.

  A plurality (two in this case) of fusion splicing portions S2 of the output optical fiber core 26 and the optical fiber core wire 5 are mounted between the upper storage portion 20a and the lower storage portion 20b of the connection tray 20. A connecting portion mounting portion 28 is provided.

  The connection tray 20 is provided with a guide portion 29 that forms the upper housing portion 20a and a guide portion 30 that forms the lower housing portion 20b. By these guide portions 29, 30, side portion accommodating portions 20 c for accommodating the input optical fiber core wires 22 are formed on the left and right sides of the connection tray 20.

  The connection tray 20 includes a plurality of pressing plates 31 for pressing the input optical fiber core wire 22, a plurality of pressing plates 32 for pressing the output optical fiber core wire 26, and a plurality of pressing plates 33 for pressing the optical fiber core wire 5. And are provided.

  On the left and right sides of the outermost connection tray 20 with respect to the connection tray 19 among the four connection trays 20, hook portions 34 are respectively provided. On both the left and right sides of the connection tray 19, projections 35 that engage with the hooks 34 are provided. By hooking each hook part 34 to each projection part 35, the connection tray 19 and each connection tray 20 are held in a closed state. As a result, the connection tray 19 and each connection tray 20 can be integrally rotated around the rotation axis along the upper surface of the tray fixing base 9 and are individually substantially parallel to the rotation axis of the connection tray 19. It is possible to open and close each other around the rotation axis.

  Such a connection tray group 13 is a set of one connection tray 19 and four connection trays 20 according to the number of cores of the optical fiber core wire 3 (four-core optical fiber tape core wire). . For this reason, the connection tray group 13 can be distributed for each optical fiber core wire 3. Accordingly, it becomes easier to connect and manage the optical fiber core wire 3.

  As shown in FIG. 7, the drop tray 14 has a fusion splicing portion S <b> 3 between one optical fiber core 5 cut at the connection tray 20 and the optical fiber core 7 extending from the outer sheath of the drop cable 6. Is a fiber storage tray for storing the optical fiber cores 5 and 7 together.

  A support portion 36 having a pair of pins 36 a that engage with the pin receiving recess 11 a of the inner lane 11 is provided at the lower end portion (base end portion) of the drop tray 14. By fitting these pins 36 a into the pin receiving recesses 11 a, the drop tray 14 can turn around the rotation axis along the upper surface of the tray fixing base 9 while standing with respect to the tray fixing base 9.

  At the upper end of the drop tray 14, a plurality (two in this case) of connecting portion mounting portions 37 to which the fusion connecting portions S <b> 3 between the optical fiber core wires 5 and 7 are mounted are provided. The drop tray 14 is provided with a plurality of pressing plates 38 for pressing the optical fiber core wires 5 and 7.

  Returning to FIGS. 1 to 3, a plurality of substantially ring-shaped core wire guide portions for guiding the optical fiber core wires 3, 5, 7, 16, 22 separately from each other on the left and right sides of the tray fixing base 9. 39 is provided. Each core wire guide portion 39 has a core wire introduction portion 39 a for guiding the optical fiber core wires 3, 5, 7, 16, 22 to the internal space of the core wire guide portion 39.

  By providing such a core wire guide portion 39, the optical fiber core wires 3, 5, 7, 16, and 22 can be arranged and wired for each core wire type. Thereby, congestion of the optical fiber core wires 3, 5, 7, 16, and 22 can be prevented outside the core wire passing tray 12, the connection tray group 13, and the drop tray 14.

  In the closure 1 as described above, when connecting the main trunk cable 2, the branch cable 4, and the drop cable 6, first, the outer core of the trunk trunk cable 2 is removed and the exposed optical fiber core 3 is exposed. Is accommodated in the core wire passing tray 12.

  Further, the optical fiber core wire 16 formed by cutting and single-fiber separating the optical fiber core wire 3 (4-core optical fiber tape core wire) and the input optical fiber core wire 22 of the optical splitter 21 are fusion-connected. Then, the fusion splicing portion S1 between the optical fiber core wire 16 and the input optical fiber core wire 22 is attached to the connection portion attachment portion 24 of the connection tray 19, and the optical fiber core wire 16 and the input optical fiber core wire 22 are connected. The tray 19 is accommodated.

  Further, the output optical fiber core 26 of the optical splitter 21 and the optical fiber core 5 are fusion-connected. Then, the optical splitter 21 is mounted on the splitter mounting portion 27 of the connection tray 20, and the fusion connecting portion S <b> 2 between the output optical fiber core wire 26 and the optical fiber core wire 5 is mounted on the connection portion mounting portion 28. The output optical fiber core 26 is accommodated in the upper accommodating portion 20a of the connection tray 20, the optical fiber core wire 5 is accommodated in the lower accommodating portion 20b, and the input optical fiber core wire 22 is accommodated in the same side accommodating portion 20c. Accommodate.

  Further, the optical fiber core wire 5 and the optical fiber core wire 7 cut in the connection tray 20 are fusion-connected. Then, the fusion splicing part S3 of the optical fiber cores 5 and 7 is attached to the connection part attaching part 37 of the drop tray 14, and the optical fiber cores 5 and 7 are accommodated in the drop tray 14.

  Thus, the optical fiber core wire 3 of the main trunk cable 2, the optical fiber core wire 5 of the branch cable 4, and the optical fiber core wire 7 of the drop cable 6 are connected via the optical splitter 21.

  In the present embodiment as described above, the optical fiber core wire 3 that is a tape core wire is accommodated in the core wire passage tray 12, and the optical fiber core wires 16 and 22 that are single core wires are accommodated in the connection tray 19. To do. Further, the optical fiber core wire 26 that is a tape core wire is accommodated in the upper accommodating portion 20 a of the connection tray 20, and the optical fiber core wire 5 that is a single core wire is accommodated in the lower accommodating portion 20 b of the connection tray 20. The optical fiber core wire 16 which is a single core wire is accommodated in the 20 side accommodating portions 20c. Furthermore, the optical fiber core wires 5 and 7 which are single core wires are accommodated in the drop tray 14. That is, a plurality of optical fiber cores having different core types are not stored in one core wire storage region of the fiber storage tray. Thereby, it is suppressed that the optical fiber core wire from which a core wire type differs is mixed in a fiber accommodation tray.

  Accordingly, not only the appearance of the wiring state of a plurality of types of optical fiber cores is improved, but also only the necessary optical fiber core wires can be easily taken out from the fiber storage tray. Further, since the bending rigidity of the optical fiber core wire changes when the type of the core wire is different, local bending of the optical fiber core wire may occur. Therefore, local bending of the optical fiber becomes difficult to occur. Thereby, the desired optical transmission characteristic of an optical fiber core wire is securable.

  The present invention is not limited to the above embodiment. For example, in the above-described embodiment, one set of connection tray group 13 is configured by one connection tray 19 and a plurality of connection trays 20 that can be opened and closed with each other. However, these connection trays 19 and 20 are not separate but independent. It is good as a thing.

  In the above-described embodiment, the drop tray 14 is detachably attached to the inner lane 11 of the tray fixing base 9. However, the present invention is not limited to this. The size of the tray 14 may be increased. Further, depending on the wiring form of the optical cable, the drop tray 14 may not be provided.

  Furthermore, the structure of the fiber storage tray, the optical fiber core wire storage form, and the like are not particularly limited to those of the above-described embodiment, and various modifications can be made.

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), 9 ... tray fixing base, 12 ... core wire passage tray (fiber accommodating tray), 13 ... connection tray group, 16 ... optical fiber core wire (third optical fiber core wire), 19 ... Connection tray (first connection tray, fiber accommodation tray), 20 ... connection tray (second connection tray, fiber accommodation tray), 20a ... upper accommodation section, 20b ... lower accommodation section, 21 ... optical splitter, 22 ... input optical fiber Core wire, 26 ... output optical fiber core wire, 39 ... core wire guide portion, S1 to S3 ... fusion splicing portion.

Claims (3)

In an optical fiber connection closure for connecting a first optical fiber core of a first optical cable introduced from below and a second optical fiber core of a second optical cable introduced from below,
A tray fixing base,
A plurality of types of fiber storage trays mounted rotatably on the tray fixing base,
The plurality of types of fiber storage trays are:
A core-passing tray for accommodating the first optical fiber core wire exposed by removing a jacket of an intermediate portion of the first optical cable;
A first connection tray for accommodating a connection portion between the third optical fiber core formed by cutting the first optical fiber core and separating the single optical fiber and the input optical fiber core of the optical splitter;
Have a second connection tray for accommodating the connection portion between the second optical fiber and the output optical fiber of said optical splitter with the optical splitter,
The first connection tray can accommodate a plurality of connection portions between the third optical fiber core wire and the input optical fiber core wire,
The second connection tray has a plurality of sheets corresponding to the number of connection portions between the third optical fiber core wire and the input optical fiber core wire,
One set of the first connection tray and a plurality of the second connection trays are pivotally attached to the tray fixing base, and the first connection tray and the second connection trays. The trays can open and close each other,
An upper accommodating portion for accommodating the output optical fiber core wire is provided in the upper region of the second connection tray, and the second optical fiber core wire is accommodated in the lower region of the second connection tray. An optical fiber connection closure, characterized in that a lower housing part is provided . The tray on both sides of the fixed base, a different type of claim 1 Symbol placement closure for optical fiber connection, characterized in that the core wire guide portion for by each other separated optical fiber guides are provided . Preparing an optical fiber connection closure according to claim 1 or 2 ,
Removing the outer cover of the intermediate portion of the first optical cable to cut the exposed first optical fiber and separating the single optical fiber to form a third optical fiber;
Accommodating the first optical fiber core wire in the core wire passing tray;
Connecting the third optical fiber core and the input optical fiber core wire of the optical splitter, and housing the connecting portion together with the third optical fiber core and the input optical fiber core in the first connection tray; When,
The output optical fiber core wire of the optical splitter is connected to the second optical fiber core wire, and the connection portion is connected to the second connection tray together with the optical splitter, the output optical fiber core wire, and the second optical fiber core wire. And an optical fiber connecting method.

Images