JPH10186142A - Optical fiber excess length storing structure, optical wiring method and working jig - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily execute connection work, to improve the efficiency of work and the storing efficiency of excess length for connection and to reduce the influence to be exerted upon optical communication as much as possible at the time of work such as connection switching. SOLUTION: After previously applying optical wiring related to a photocoupler to a coupler storing case 43 and an excess length storing case 20, the optical wiring is stored in an optical wiring rack as one unit. Leading excess length 65 is secured between both cases 43, 20, only the case 20 is pulled out to the outside of the rack while holding the case 43 on a fixed position in the rack and a photocoupler side tape fiber 22 pulled out together with the case 20 is optically connected to a tape fiber 21 independently led into the rack.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical fiber extra length storing structure, a wiring method, and a work jig.

[0002]

2. Description of the Related Art In an optical fiber network, for example, in order to connect an optical cable on a subscriber side to an optical cable inside a station, an optical distribution rack (FTM) which terminates a large number of optical fibers inside and outside the station to form a large group. Is used. 9 and 10 are views showing a conventional FTM. In the figures, reference numeral 1 denotes a frame, 2 denotes a terminal plate, 3 denotes an optical connector, and 4 denotes an optical component such as an optical coupler and an extra connection length. It is an optical branch module.

[0003] The frame 1 is formed in a shelf shape divided into a plurality of steps at equal intervals by horizontally arranged partition plates 5, and a plurality of steps for accommodating the optical branching module 4 are formed. . A terminal plate 2 that substantially covers the opening is fixed to the same side opening of each stage of the frame 1.
The terminal plate 2 has a hole 6 for mounting the optical adapter 3.
A plurality of optical adapters 3 corresponding to the SC type optical connector are arranged and fixed two by two in the hole 6. On both sides of the optical adapter 3, a plurality of SC-type terminals (plugs) (not shown) each having a single-core optical fiber core 7 terminated are arranged outside, and another light drawn through the optical branching module 4 is provided. A plurality of SC type terminals (plugs) (not shown) for terminating a single core wire 8b obtained by branching the end of a fiber tape core 8 (hereinafter, "tape core wire") into a single core by a splitter 8a are connected to the single core It is arranged at a position corresponding to the terminal for the optical fiber core wire 7, and the plugs on both sides are positioned and connected by a positioning ring in the optical adapter 3.

[0004] The optical branching module 4 serves as an extra length storage case for storing the extra length of the tape core wire 8. For example, each stage of the frame 1 has a length of 13.5 m.
Approximately 50 m-widths are provided in one step. As shown in FIG. 11, inside the optical branching module 4, the extra length of the tape core 8 coded by the reinforcing tube, the optical coupler 9 connected to the tape core 8, and the tape cores 8. Connector 10 (Mechanically connected)
Transferable). The extra connection length of the tape core wire 8 is wound in an appropriate number of times and stored in the optical branching module 4.

[0005]

Incidentally, the optical branching module 4 is of a type in which the extra connection length and the optical component are housed in the same case. The connection operation with the tape core 8 is schematically described as follows. 1. The case of the optical branch module 4 is removed from the FTM. 2. Open the lid of the case and take out the stored tape core 8. 3. The connection method may be an optical connector and fusion splicing. In the case of using fusion splicing, a fusion splicer is installed on the working side, and the fusion splicer is used to connect the tape core 8 of the termination cable. And the tape core wire 8 in the case are fusion-spliced. 4. After the fusion splicing, the excess connection length of the tape core wire 8 is stored in the case so as not to be twisted, and the lid is closed. 5. The optical branching module 4 is returned to the original position of the FTM. In the above connection work, since the space between the optical branching modules 4 is narrow and the optical fiber core 8 is congested, the take-out and re-storage work of the case and the core connection work have been extremely careful. Since the number of cores accommodated in the FTM has increased, and the mounting density of the optical branching module 4 has been improved accordingly, there has been a demand for an extra-length storage system that is simpler in connection work and superior in workability.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and it is easy to connect and improve the working efficiency. Also, it is possible to improve the storage efficiency of the extra connection length, and to perform the connection switching work. It is an object of the present invention to provide an optical fiber extra length storage structure, an optical wiring method, and a working jig which can reduce the influence on optical communication as much as possible.

[0007]

According to the first aspect of the present invention, in order to solve the above-mentioned problems, an optical coupler for branching a single-core or multi-core optical fiber into a multi-core optical fiber by an optical coupler. An optical fiber extra length storage structure applied to a rack, wherein a coupler storage case that stores an optical coupler, and a unit that collectively includes an extra length storage case formed separately from the coupler storage case. The extra length storage case is stored in a plurality of optical wiring racks,
The sheet-shaped material is bent to form an external thin plate, and a radius maintaining claw for maintaining a curved state of the optical fiber with a curvature radius equal to or greater than a specified value and a temporary fixing portion for temporarily fixing an optical connection portion between the optical fibers. Is a tray-shaped main body protruding from the inner surface side, a lid overlapped with the main body, and one or more optical fiber insertions constantly communicating with the inside and outside of an optical fiber storage space formed inside the main body. With a hole, secure the extra length for the optical fiber laid out between the coupler storage case and the extra length storage case in the same unit, with respect to the coupler storage case at the fixed position in the optical wiring rack. The extra length storage structure of the optical fiber is characterized in that the extra length storage case can be pulled out of the optical wiring rack.

According to the second aspect of the present invention, the coupler housing case for housing the optical coupler and the extra length housing case formed separately from the coupler housing case and installed corresponding to the coupler housing case. After performing the optical wiring related to the optical coupler in advance and securing the extra length for the optical fiber laid between the coupler storage case and the extra length storage case, the coupler storage case and the extra length storage case are connected to the optical wiring rack. In the connection work between the optical fiber separately introduced in the optical wiring rack and the optical fiber on the optical coupler side, the coupler storage case is left attached to the optical wiring rack. After taking out only the extra length storage case from the optical wiring rack and opening it, and after connecting the optical fibers, the optical connection part and extra connection length are set in the extra length storage case. The optical wiring method characterized by housing was solutions of the problems.

According to the third aspect of the present invention, a support table on which the extra length storage case is mounted, and a detachable attachment for detachably attaching the support table to a structure such as an optical wiring rack for storing the extra length storage case. A work jig for solving the above-mentioned problem, comprising: a cover holding portion that engages with a lid portion of the opened extra length storage case to maintain an open state of the extra length storage case. And

The operation of the present invention will be described below. According to the extra length storage structure of the optical fiber according to the first aspect, the extra length is secured, so that the extra length storage case can be pulled out of the optical wiring rack with respect to the coupler storage case. I have. Therefore, when the extra length storage case is to be stored in the extra length storage case, the extra length storage case can be pulled out to the outside of the optical wiring rack, and the work can be performed in a place where a favorable working environment can be ensured. Wiring work in the optical wiring rack can be greatly reduced. Further, since the entire extra length storage case is formed by bending a sheet-shaped material, it is easy to reduce the weight and cost. This extra-length storage case is formed by cutting and bending the original sheet before bending, so that the extra-length storage case is formed into a shape corresponding to the number of storage cores, the amount of extra length to be stored, and the number of optical connection portions to be stored. It is easy. Also, since the whole is formed in a lump, there is no part to be separated at the time of opening, and there is no fear that the part falls during the operation.

According to the optical wiring method of the present invention, the coupler storage case and the extra-length storage case in which the optical wiring related to the optical coupler has been completed before being stored in the optical wiring rack are stored in the optical wiring rack. Work such as optical wiring in the coupler storage case and extra length storage case can be efficiently performed in a place where a work environment such as a sufficient work space area can be secured, and wiring work in a narrow optical wiring rack. Can be greatly reduced. Also, when pulling out the extra length storage case from the optical distribution rack and connecting another optical fiber introduced into the optical distribution rack to the optical fiber on the optical coupler side, without pulling out the coupler storage case, pull out the extra length storage case. Since the optical fiber on the optical coupler side is pulled out together with the extra-length storage case due to the extra length, there is no need to put a hand into the optical wiring rack and take out the optical fiber on the optical coupler side. Also in this work, the extra-length storage case can be pulled out to a place where a good working environment can be secured, so that workability can be secured. The extra length storage case, which stores the optical connection portions and the extra connection lengths of the optical fibers, can be easily stored again in the original position simply by being inserted into the optical wiring rack while being guided by the guide member. The coupler storage case is formed in the same thin plate shape as the extra length storage case, and a pair of the extra length storage case and the coupler storage case is collectively stored as one unit in the optical wiring rack side by side. . At this time, since there is almost no wiring work in the optical wiring rack after the storage work, there is no need to secure a working space between the stored extra-length storage case and coupler storage case, and these extra-length storage The mounting density of the case and the coupler storage case can be improved. Also, a pair of coupler storage case and extra length storage case,
Since it is supported by the same guide member and housed in the optical wiring rack, even if there are many cases, the cases can be efficiently arranged and housed, and the mounting density can be further improved. There is an advantage that it is easy to find the unit.

According to the third aspect of the present invention, the work jig is mounted on the support base by using a structure such as an optical wiring rack and installed near the extra-length storage case for the purpose of work. Supports the extra length storage case body. The extra-length storage case is placed on the support base with the lid part up, and when opened, the open state is maintained by engaging the lid with the lid pressing part, thereby improving workability. In addition, since the work jig can be easily relocated using the attachment / detachment means, good workability can always be easily ensured in accordance with the work position.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of an optical fiber extra length storage structure according to the present invention will be described below with reference to FIGS. In the figure, reference numeral 20 denotes an extra length storage case for optical fibers. As shown in FIG. 1, the extra-length storage case 20 is formed by bending a sheet-like material made entirely of resin or the like into a thin rectangular shape in appearance, and has an eight-core optical fiber tape (hereinafter referred to as “tape”). Core wire ") A tray-shaped main body 26 for accommodating the fusion spliced portion 23 and the extra connection lengths 24, 25 of the 21 and 22, and a lid 27 for opening and closing the opening side (left side in FIG. 1) of the main body 26. (See FIG. 6). The tape cores 21 and 22 correspond to the optical fiber according to the first aspect.

As shown in FIGS. 1 and 6, on the inner surface side of the main body portion 26, a temporary fixing portion 28 for detachably holding and fixing the fusion splicing portion 23, and an extra connection length of the tape cords 21 and 22. 2
A plurality of radius maintaining claws 29 are provided to maintain the curved state of the curved portions 4 and 25 with a curved radius equal to or greater than a specified radius. The temporary fixing part 28 is formed on the take-out side of the main body part 26 with respect to the optical wiring rack 30 described later (left front side in FIG. 1, left side in FIG. 2, left front side in FIG. 6). The extra length storage case 20 stores four tape cores 21 and 22 each, and a total of four fusion spliced parts 23 are stored in an arrayed state by the temporary fixing part 28. As shown in FIGS. 1 and 2,
An optical fiber insertion hole 31 for introducing the terminated core wire 21 into the extra length storage case 20 is opened below the temporary fixing portion 28 (the lower side in FIG. 1 and the lower side in FIG. 2). I have. Since the optical fiber insertion hole 31 is opened in the side portion 32 of the main body 26, the open state is always maintained regardless of the opening and closing of the lid 27.

On the upper outer surface of the main body 26, the main body 26
A stopper 34 and a retaining projection 35 are formed to engage with an engaging member 33 (see FIG. 2) in the optical wiring rack 30 to generate a pull-out resistance when the optical disk is inserted and stored in the optical wiring rack 30. I have. The upper portion of the main body portion 26 on the insertion rear side (the right rear side in FIG. 1, the right side in FIG. 2) includes a tape core 22 on the branch side.
The optical fiber insertion hole 36 for introducing the into the extra length storage case 20 is opened. This optical fiber insertion hole 36
Also, the open state is always maintained regardless of the opening and closing of the lid 27. Inside the optical fiber insertion hole 36, a rubber or resin tape core fixture 37 for holding and fixing the tape core 22 is attached.

As shown in FIG. 6, the lid 27 is
6 is an extended portion of the side portion 32 on the insertion rear side toward the opening side, and the front end portion is inserted into an engagement slit 39 formed on the side portion 32 on the take-out side of the main body portion 26 to be engaged with the main body. The closed state of the opening side of the section 26 is maintained, and the lid 27 is closed.
Is detached from the engagement slit 39 to open the opening side of the main body 26. The tape cores 21 and 22 correspond to the optical fiber according to the first aspect, and the engagement slit 39 corresponds to the engaging / disengaging means according to the first aspect.

Hereinafter, the optical distribution rack 30 will be described with reference to FIGS. In the figure, the optical distribution rack 30 is
It is shaped like a shelf that is divided into multiple stages by a plurality of partition plates 40, and a pair of case support plates 41 are vertically opposed to each other and separated from each other by the stages partitioned by the partition plates 40. A large number of support flanges 42 are arranged in a protruding manner on the inner surface of each case support plate 41 facing each other, and between the pair of case support plates 41, an extra-length storage case sandwiched between these support flanges 42. 20 are supported in a vertical position, and are arranged and stored at a plurality of horizontal and equal intervals. The support flange 42 corresponds to the guide member according to the second aspect.

A gutter-shaped cord receiving portion 40a is provided at the take-out side (left side in FIG. 2, left front side in FIG. 3) end of each partition plate 40 in the width direction of the partition plate 40 (in the depth direction in FIG. 3 extends from the left rear to the right front of the drawing, and accommodates the tape core 21 drawn into the optical distribution rack 30 from an optical cable (not shown) or the like. The core wire receiving portion 40a also protrudes from an end of the partition plate 40 on the insertion rear side. Also,
A positioning abutment plate 40b (see FIG. 2) for abutting and positioning a coupler storage case 43, which will be described later, inserted into the optical wiring rack 30 is provided on the insertion rear side of each partition plate 40. An engagement / disengagement claw 43a protruding from the coupler storage case 43 is engaged with the contact plate 40b in a detachable manner. The optical wiring rack 30 corresponds to the optical wiring rack according to claims 2 and 3.

Reference numeral 43 in the figure denotes a coupler storage case that is inserted into the optical wiring rack 30 and stored at the same time as the extra-length storage case 20. As shown in FIGS. 1 and 2, the coupler storage case 43 is formed in a thin plate that is vertically supported by being inserted between the support flanges 42 similarly to the extra-length storage case 20. Inside the coupler storage case 43, a coupler fixing portion 4 to which the optical coupler 44 is adhered and fixed.
5 and an extra length maintaining portion 46 around which the optical fiber core wire is wound outward with a curvature radius equal to or greater than a specified radius. The optical coupler 44 connects the eight single-core wires 47 in total to the coupler housing case 4.
4 tape cores 22 introduced in 3 (total 32 cores)
This is a wavelength-independent quartz-substrate waveguide type star coupler that branches into a light source. The ends of the single-core wires 47 opposite to the optical coupler 44 are plug-terminated, respectively, so that the coupler storage case 43 is formed.
1 is connected from the inside of the coupler storage case 43 to an eight-stage SC adapter 48 fixed to the insertion rear side (right rear side in FIG. 1, right side in FIG. 2). Further, on the take-out side of the coupler housing case 43 (the left front side in FIG. 1 and the left side in FIG. 2), the introduction hole 49 of the tape core wire 22 and the curvature for maintaining the curvature radius of the tape core wire 22 outside the introduction hole 49 are provided. A unit 50 is provided.

4 and 5 show a working jig 51. FIG.
The work jig 51 has a support table 52 on which the extra-length storage case 20 is placed. The lower surface of the center of the support 52 is detachably engaged with the outermost edge flange 53 of the core receiving portion 40a of the optical distribution rack 30 to support the support 52 substantially horizontally. Engaging flange 54
Is protruding. In the figure, the engagement flange 54 has a structure in which a slit 55 opening at the lower end is inserted from above the edge flange 53 and engaged therewith. It is also possible to apply a structure other than the slit 55. Also,
The object to which the engagement flange 54 is engaged is not limited to the edge flange 53 as long as the workability of the operation in the extra-length storage case 20 can be ensured.
Outside structures can also be applied. The engaging flange 54 corresponds to the attaching / detaching means according to the third aspect.

The support table 52 has a rectangular plate shape,
A positioning flange 57 is provided to roughly position the extra-length storage case 20 placed on the upper surface 6 in the surface direction of the upper surface 56. The positioning flange 57 extends only on both sides of one corner 58 of the support base 52, and from the corner 58, engages with the lid 27 of the extra-length storage case 20 which is open to store the extra-length storage. An L-shaped lid holding portion 59 for maintaining the open state of the case 20 is provided to project further above the positioning flange 57. Further, the main body 26 is stably placed on the upper surface 56 by being inserted into an insertion hole 60 opened in the main body 26 of the extra-length storage case 20 in a portion where the positioning flange 57 on the outer peripheral portion of the support base 52 is not provided. A flange-like holding projection 61 for holding is protruded.

The operation and effect of the extra length storage structure of the optical fiber of the present embodiment will be described below. Extra length storage case 2
Numeral 0 is housed in the optical distribution rack 30 so as to be inserted between the pair of case support plates 41.
When performing operations such as fusion splicing of the tape core wires 21 and 22 stored in the extra-length storage case 20, the extra-length storage case 20 is pulled out from between the case support plates 41 to the take-out side, and the lid portion 27 is opened to perform the operation. After taking out the target tape core wires 21 and 22 and returning the optical connection portion to the temporary fixing portion 28 after the operation is completed, the opening side is closed by the lid portion 27. When the extra lengths 24 and 25 are small, it is possible to pull out the extra length storage case 20 so that the take-out side projects from the case support plate 41 and perform the work. When the amount of withdrawal is large, the work 2
7 is completely opened and the work proceeds.

Further, since the extra length storage case 20 is formed by cutting (including punching and the like) a single sheet-shaped material before bending, and then bending and forming the same, the manufacturing is facilitated and the manufacturing cost is reduced. The cost can be reduced, and the number of core wires to be stored, the storage amount of the extra lengths 24 and 25, and the fusion spliced portion 2
It is easy to form into a shape corresponding to the number 3, etc.
Versatility is improved. In addition, the fact that the whole is formed of a single member means that there is no part separated from the main body 26 at the time of opening, and there is no fear of parts falling during work, so that the workability at the time of opening and closing can be improved. In addition, since a mechanism for connecting a plurality of components is not required, miniaturization is easy, and the mounting density on the optical wiring rack 30 can be improved.

That is, as shown in FIG. 7, the extra-length storage case 20 is formed by developing a single sheet of material on a plane and performing a cutting process, thereby temporarily fixing and fixing a portion 28, a radius maintaining claw 29, and an optical fiber. Since the insertion holes 31, 36, the engagement slit 39, and the like are formed at desired positions, the number of stored core wires and the extra lengths 24, 25
It is easy to design in accordance with the amount of storage and the number of fusion splicing parts 23. Further, since it is possible to assemble without using a tool or the like simply by bending the broken line portion in the drawing as a folding line after processing, it can be manufactured much more easily than assembling a large number of parts. Since the temporary fixing part 28 and the radius maintaining claw 29 are formed so as to be bent and rise from the main body part 26, by adjusting the bending position in addition to the cutting processing position, the number of core wires to be stored and the extra length are stored. 24, 25, the size of the fusion splicing portion 23, and the like.

As shown in FIG. 8, on both sides of the temporary fixing portion 28, a connecting portion core gripping claw 28a for holding and fixing the fusion spliced tape cores 21 and 22 near the fusion splicing portion 23 is provided. To form The connection portion core wire gripping claw 28a is
It has a plurality of slits 28b capable of gripping the first and the second case 22, and is folded so as to rise almost vertically from the main body 26 to the inner surface side of the case when the extra-length storage case 20 is assembled. At the time of forming the temporary fixing part 28 and the connecting part core wire grasping claw 28a, the pressing force applied to the fusion splicing part 23 by the temporary fixing part 28 to the outside of the main body part 26 causes the tape core 21 sandwiched between the slits 28b, 22 is pushed into the inner side of the slit 28b so that it does not easily come off.

The extra-length storage case 20 is stored in the optical distribution rack 30 with a drawer extra length 65 previously secured between the extra-length storage case 20 and the coupler storage case 43, so that the extra-length storage case 20 can be easily taken out from between the pair of case support plates 41. In addition, during storage and removal operations, there is no effect of vibration or the like on the optical coupler 44 in the coupler storage case 43. Note that withdrawal length is 6
5 is such that the bending radius is always maintained to a specified value or more by a bending portion 50 protruding from the take-out side of the coupler storage case 43.

The operation and effect of the working jig 51 of this embodiment will be described below. The work jig 51 is installed by engaging the engaging flange 54 with the edge flange 53 of the optical wiring rack 30 near the storage position of the extra-long storage case 20 in the optical wiring rack 30 for the purpose of work. Optical distribution rack 3
The extra length storage case 20 extracted from 0 is supported on a support 52. As shown in FIG. 6, on the support base 52, the insertion side of the extra length storage case 20 is roughly positioned so as to abut against the corner 58. At this time, the holding projection 6 protruding from the insertion hole 60 of the main body 26 to the upper surface 56 of the support base.
1 is inserted inside the extra length storage case 20, and the extra length storage case 20 is stably supported. If the lid 27 opened to the main body 26 is turned to the outside of the lid pressing part 59 to restrict the lid 57 from closing, the main body 26 can be lifted from the upper surface 56 of the support base by the holding projection 61. As a result, the open state of the extra length storage case 20 can be stably maintained.

The work jig 51 is small and lightweight, and can be easily attached to and detached from any of the edge flanges 53 by using the engagement flange 54, and can be easily attached to and detached from places other than the edge flange 53. become. In addition, since the positioning flange 57 and the lid holder 59 can be used to suspend the work jig 51, the work jig 51 is used.
Can be easily installed at an appropriate position other than the edge flange 53.

An embodiment in which the optical wiring method according to the present invention is applied to an optical wiring rack 30 will be described below. To assemble the optical distribution rack 30, the tape core 22 related to the optical coupler 44 is attached to the extra length storage case 20 and the coupler storage case 43.
And the pair of the extra length storage case 20 and the coupler storage case 43 for which the wiring has been completed is connected to the unit 3.
It is inserted into the target position between the case support plates 42 from the take-out side in a lump as 0A. At this time, in each unit 30A, the extra lead length 65 is secured in advance to the tape core wire 22 laid between the coupler storage case 43 and the extra length storage case 20, and the extra length storage case 20 is connected to the optical wiring rack 30.
Even if the tape core wire 22 is pulled out from the excess length storage case 20, the portion of the tape core wire 22 stored in the excess length storage case 20 is prevented from being pulled out from the excess length storage case 20.

When the storage of the extra length storage case 20 and the coupler storage case 43 in the optical wiring rack 30 is completed, the operation of fusion splicing the tape core wires 21 and 22 and the operation of storing the fusion splicing portion 23 are performed. This is sequentially performed for the storage case 20. In order to work on a desired extra-length storage case 20, a pair of tape cores 21 and 22 to be connected to each other for each extra-length storage case 20 is determined, and then a work jig 51 set at an appropriate position is placed on the work jig 51. At the same time, the intended extra length storage case 20 pulled out from the optical wiring rack 30 is placed, and the corresponding tape core wire 21 is taken out from the core wire receiving portion 40a and introduced into the work jig 51. At this time, since a sufficient extra pull-out length 65 is secured between the extra-length storage case 20 and the coupler storage case 43, the end of the tape core wire 22 stored in the extra-length storage case 20 also has an extra length. The case 20 is pulled out together with the case 20, and the extra-length storage case 20 is not pulled out. Therefore, there is no need to separately pull out the tape core wire 22 from the optical wiring rack 30. Simply pull out the extra length storage case 20 and place it on the work jig 51, and the tape core wire 22 is also used for the work. Since it is pulled out onto the jig 51, the work efficiency is improved.

The tape cores 21 and 22 corresponding to each other are:
After winding around the outside of the radius maintaining claw 29 in the extra length storage case 20 fixed to the work jig 51 so as not to be twisted on the way, the remaining unwound ends are connected to the optical wiring rack 3.
The fusion splicing is carried out by the fusion machine 66 (shown by a chain line in FIG. 6) carried into the take-out side of No. 0. By doing so, the tape cores 21 and 22 can be connected without twisting in the middle, and the tape cores 21 and 22 can be connected by twisting.
The possibility of affecting the optical transmission performance of
Desired optical transmission performance can be stably maintained over a long period of time. Further, once the tape cores 21 and 22 are wound around the radius maintaining claw 29, there is a disadvantage that the tape cores 21 and 22 are separated during the connection work or project on the welding machine 66 to hinder the work. Is prevented and workability is improved. The extra length storage case 20 is stably supported at a desired position by the work jig 51 by inserting the insertion hole 60 into the holding projection 61 of the work jig 51, so that the tape core wires 21 and 22 can be maintained in the radius maintaining claw. It is possible to improve workability such as the work of winding around 29.

When the fusion of the tape cores 21 and 22 is completed, the fusion splicing part 23 is gripped and fixed in the extra length storage case 20 by using the temporary fixing part 28 and the connecting part core gripping claw 28a. At the same time, the winding diameters of the extra connection lengths 24 and 25 are expanded to such an extent that they come into contact with the side portions 32 of the main body portion 26 to absorb the extra lengths 24 and 25 that have been drawn out during the fusion work, and the lid portion 27 is closed. After closing, the extra length storage case 20 is moved to the optical distribution rack 3.
0 at a predetermined position. Even if the winding diameter of the extra connection lengths 24 and 25 is expanded, no twist is generated in the middle of the extra connection lengths 24 and 25, and a good storage state can be maintained. If the work jig 51 and the welding machine 66 are sequentially moved, the tape cores 21, 2,
Since the fusion work between the two can proceed efficiently,
High workability is obtained.

Therefore, according to the optical wiring method of the present embodiment, the extra length storage case 20 in which the wiring of the tape core wire 22 relating to the optical coupler 44 has been performed in advance outside the optical wiring rack 30.
In addition, since the coupler housing case 43 is housed in the optical wiring rack 30, workability can be greatly improved as compared with the case where the work is performed in the narrow optical wiring rack 30. Moreover, the coupler storage case 43 is moved by the action of the extra drawer 65 secured between the extra length storage case 20 and the coupler storage case 43 so that the positioning contact plate 40 of the optical wiring rack 30 is moved.
b, it is possible to pull out only the extra length storage case 20 to the take-out side of the optical distribution rack 30 while keeping the tape core 2 in a place where a good working environment can be secured.
Since work such as fusion splicing between the first and the second 22 can be performed, workability of these works is improved. Further, after the work is completed, the extra-length storage case 20 can be easily re-stored at a desired position simply by inserting the extra-length storage case 20 into the original position between the case support plates 41. improves. Further, since there is no need to secure a gap for hand between the adjacent extra-length storage cases 20, it becomes possible to arrange the extra-length storage cases 20 and the coupler storage cases 43 at high density. Density can be improved.

It is also possible to connect the tape cores 21 and 22 to each other with a connector. In this case, a temporary fixing portion for holding and fixing the optical connector is protruded in the extra length storage case 20. . Further, the extra-length storage case of the present invention can be applied to, for example, various optical wiring racks installed in closures, optical wiring boards, and the like. Various optical components other than the optical coupler can be stored in the coupler storage case which is stored in the optical wiring rack together with the extra length storage case.

[0035]

As described above, according to the optical fiber extra length storage structure of the first aspect, the extra drawer length is secured between the coupler storage case and the extra length storage case. Even if the storage case is attached to a fixed position in the optical wiring rack, the extra storage case can be pulled out to the outside of the optical wiring rack with respect to the coupler storage case. Therefore, when the extra length storage case is to be stored in the extra length storage case, the extra length storage case is pulled out of the optical wiring rack, and the optical wiring work and the optical fiber connection are performed in a place where a good working environment can be secured. Connection work can be performed, and wiring work in a narrow optical wiring rack can be greatly reduced. Also, since the entire extra length storage case is formed by bending a sheet-like material,
It is easy to reduce the weight and cost, and it is easy to design according to the number of storage cores, the amount of extra length to store, the number of optical connection parts, etc., and the versatility is improved. In addition, since there is no component to be separated when opened, there is no danger that the component will fall during the operation, and an excellent effect that the operation can be efficiently advanced can be achieved.

According to the optical wiring method of the second aspect, after completing the optical coupler of the extra length storage case and the coupler storage case and the optical wiring related to the optical coupler, the extra length storage case and the coupler storage case are separated. Since they are housed collectively in an optical wiring rack, the work of storing wiring and the like in a narrow optical wiring rack can be greatly reduced, and the optical wiring of the extra-length storage case and coupler storage case can be reduced. It can proceed efficiently in a place where the environment can be secured, and wiring work efficiency is improved. Also, since there is no need to secure a working space between the stored extra-length storage case and the coupler storage case, the mounting density of the extra-length storage case and the coupler storage case in the optical wiring rack can be improved. it can. When connecting the optical fiber related to the optical coupler and the optical fiber separately drawn into the optical wiring rack, since the extra length storage case is pulled out from the optical wiring rack, the optical fiber on the optical coupler side is also pulled out together. There is no need to separately pull out the optical fiber on the optical coupler side from the inside of the optical wiring rack, and an excellent effect that the connection operation can be performed efficiently can be achieved.

According to the working jig of the third aspect, when the extra length storage case placed on the support base is opened, the lid is engaged with the lid pressing portion to open the extra length storage case. , The workability inside the extra length storage case is improved. In addition, since the work jig can be easily relocated using the attaching / detaching means, the work jig can always be installed at an appropriate position in accordance with the work position, and a connection between the optical fibers housed in the extra-length storage case. And so on, and an excellent effect of improving the work efficiency.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of an extra length storage case of an extra length storage structure of an optical fiber of the present invention.

FIG. 2 is a front sectional view showing the extra-length storage case and the coupler storage case of FIG. 1;

FIG. 3 is a perspective view showing a state where the extra-length storage case and the coupler storage case of FIG. 1 are stored in an optical wiring rack.

FIG. 4 is a perspective view showing an embodiment of the working jig of the present invention.

FIG. 5 is a side view showing the operation of the working jig of FIG.

6 is a perspective view showing the operation of the working jig of FIG.

FIG. 7 is a development view showing a method of processing the extra-length storage case of FIG. 1;

FIG. 8 is a perspective view showing the extra-length storage case of FIG. 1, showing a temporary fixing part;

FIG. 9 is a side view showing a conventional FTM.

FIG. 10 is a front view showing a conventional FTM.

FIG. 11 is a front view showing the optical branch module.

[Explanation of symbols]

Reference numeral 20: extra storage case, 21: optical fiber (tape core), 22: optical fiber (tape core), 23: optical connection part (fusion connection part), 24: extra connection length, 25: extra connection length ,
26 ... body part, 27 ... lid part, 28 ... temporary fixing part, 29 ...
Radius maintaining claw, 30 ... optical wiring rack, 30A ... unit,
31: Optical fiber insertion hole, 36: Optical fiber insertion hole, 4
2 ... Guide member (support flange), 43 ... Coupler storage case, 44 ... Optical coupler, 51 ... Working jig, 52 ... Support table, 54 ... Attachment / detachment means (engagement flange), 59 ... Lid holder, 65 ... Extra withdrawal length.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Tatsuhiko Matsuura 3-19-2 Nishi-Shinjuku, Shinjuku-ku, Tokyo Within Japan Telegraph and Telephone Corporation (72) Inventor Tetsuya Enomoto 3- 19-2 Nishi-Shinjuku, Shinjuku-ku, Tokyo No. Nippon Telegraph and Telephone Corporation (72) Naoki Nakao, inventor 3-192-2 Nishishinjuku, Shinjuku-ku, Tokyo Japan Telegraph and Telephone Corporation (72) Masato Kuroiwa 3-192, Nishishinjuku, Shinjuku-ku, Tokyo No. Within Nippon Telegraph and Telephone Corporation (72) Inventor Shigenori Goto 1-15-5 Botan, Koto-ku, Tokyo Inside Suzuki Giken (72) Inventor Yoshio Kobayashi 1-15-5 Botan, Koto-ku, Tokyo Stock Inside Suzuki Giken (72) Inventor Shuichi Kurihara 1-15-5 Botan Koto-ku, Tokyo Inside Suzuki Giken

Claims (3)

[Claims] An extra length of an optical fiber applied to an optical distribution rack (30) for branching a single-core or multi-core optical fiber into a multi-core optical fiber (21) by an optical coupler (44). A unit (30A) having a housing structure, in which a coupler housing case (43) for housing an optical coupler and an extra-length housing case (20) formed separately from the coupler housing case.
The extra length storage case is formed by bending a sheet-like material into an external thin plate shape, and bending the optical fibers (21, 22) with a bending radius greater than a specified value. A tray-shaped main body (26) having a radius-maintaining claw (29) for maintaining the state and a temporary fixing part (28) for temporarily fixing the optical connection part (23) between the optical fibers; A lid portion (27) overlapped with the main body portion, and one or more optical fiber insertion holes (31, 36) constantly communicating with the inside and outside of an optical fiber storage space formed inside the main body portion;
The extra length (65) is secured in the optical fiber (22) laid between the coupler storage case and the extra length storage case in the same unit, and the optical fiber (22) is at a fixed position in the optical distribution rack. An extra length storage structure for an optical fiber, wherein the extra length storage case can be drawn out of the optical wiring rack with respect to the coupler storage case. 2. A coupler storage case (43) for storing an optical coupler (44) and an extra-length storage case (20) formed separately from the coupler storage case and installed corresponding to the coupler storage case. At the same time, the optical wiring related to the optical coupler is preliminarily performed, and the extra lead length (6) is provided to the optical fiber (22) laid out between the coupler storage case and the extra length storage case.
After securing 5), the coupler storage case and the extra-length storage case are housed so that they can be pulled out by the same guide member (42) in the optical wiring rack (30), and the optical fiber separately introduced into the optical wiring rack. When connecting (21) to the optical fiber on the optical coupler side, with the coupler storage case still attached to the optical wiring rack, take out only the extra length storage case from the optical wiring rack and open it, and connect the optical fibers. After performing the work, the optical connection (2
3) An optical wiring method comprising storing the extra connection length (24, 25) in an extra length storage case. 3. A work jig (51) for supporting the extra length storage case when performing an operation in the extra length storage case according to claim 1, wherein the extra length storage case is placed. (52), a detachable means (54) for detachably attaching the support to a structure such as an optical wiring rack for accommodating the extra length storage case, and a lid portion of the extra length storage case opened. And a lid holding portion (59) for maintaining the open state of the extra-length storage case by engaging with the work jig.