JP3448448B2 - Optical wiring rack - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical wiring rack for transmitting test light to an optical line on a subscriber side. 2. Description of the Related Art In an optical fiber network, for example, in order to branch and connect an optical fiber cable to an optical fiber core via an optical connector connection, a large number of internal and external optical fibers are terminated to form a large group. An optical wiring rack is used. In particular, FT as an optical wiring frame used for a subscriber system transmission line
M (Fiber Termination Module) is used. FIG.
0 and 11 are diagrams showing a conventional optical wiring frame applied to the FTM. In the figure, reference numeral 1 denotes a frame, 2 denotes a terminal plate, 3 denotes an optical connector, and 4 denotes 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 well-known SC-type optical adapters 3 are arranged and fixed in the hole 6 two by two. The optical adapter 3 has a plurality of SC-type terminal optical connector plugs (not shown) to which an intra-office optical fiber 7 is connected on the outside, and a plurality of not-shown SC-type optical connectors to which an external optical fiber is connected.
Shaped terminals are arranged at positions corresponding to the terminals for the intra-office optical fiber 7. [0004] FIG. 14 shows a basic configuration of the optical branching module 4. As shown in FIG.
Inside, optical components such as an optical connector 10 for switching and connecting the optical coupler 9, the optical filter 4d, and the optical fiber 4c are housed. In order to perform the test and management of the optical line, first, the optical switch 4a selects the optical branching module that accommodates the core to be tested, and the optical branching module is transmitted from the optical pulse test device 4b (optical pulse core selecting device). The test light is transmitted via the optical coupler 9 to the optical fiber 4c outside the station to be measured.
And further, the backscattered light generated in the optical fiber 4c is received by the light receiving section of the optical pulse test device 4b via the optical coupler 9, and then the waveform of the received backscattered light is analyzed. Monitor the loss abnormality of the subscriber optical line. Referring to FIGS. 12 and 13, a conventional four-core branching module will be described. This optical branching module is a thin plate-shaped main body as a whole, and can be opened and closed by an opening / closing lid (not shown). On the back side of the optical branching module 4 (the left side in FIGS. 12 and 13), a 4-fiber optical fiber tape 8a derived from an external optical fiber cable (termination cable) K and 1-fiber derived from a core selection device. The eight-core optical fiber tape 8b is introduced. A fiber type optical coupler 9 is housed in the optical branching module 4, and an optical fiber tape 8 b on the optical fiber selecting device side is connected to an optical fiber tape 8 on the optical coupler 9 side by an optical connector 10 for eight cores. Connected to. As the optical connector 10, JIS C
So-called MT connector (Mec
A multi-core plastic optical connector such as hanically Transferable) is employed. Next, the optical fiber tape 8a on the outside optical fiber cable (terminated cable) is connected to an optical fiber tape (not shown) on the optical coupler 9 by an optical connector 10 for four cores. . On the other hand, one four-core optical fiber tape led out from the port inside the station of the optical coupler 9 is led out of the main body as an optical cord 8w, and is further separated by a multi-fiber single-fiber splitter F fixed to a side plate. 4 single-core optical fibers 8
Branch to y. The tip of each of the branched single-core optical fibers 8y is terminated to an SC-type optical plug, and is connected to an SC-type optical adapter 3 fixed to the terminal plate 2 of the frame 1. [0007] About 50 optical branching modules 4 are provided in each stage of the frame 1 with a width of, for example, 13.5 mm. Inside the optical branch module 4, an optical cord 8w, an optical coupler 9 connected to the optical cord 8w,
An optical connector 10 for optically connecting the optical fiber tapes 8a and 8b and the optical cord 8w in a switchable manner is housed therein. A suspending member 12 for suspending from a suspending rail 11 erected above each step of the frame 1 is attached to the upper side when the optical branching module 4 is stored. [0008] Incidentally, in the case of the FTM as described above, the number of parts is large, and in addition to the increase in the number of accommodated core wires and the demand for higher mounting density, there is not enough FTM for each stage. Since the size is not ensured, the work of mounting the optical components such as the optical adapter 3 has to be performed in a narrow space, and the mounting workability is unsatisfactory. Also, when replacing one specific optical splitting module 4, it is necessary to remove the optical splitting module 4 near the optical splitting module 4 to secure a space where an operator's hand can enter. With the increase in the number and mounting density, it has become difficult to work. Therefore, it is difficult to increase the number of corresponding cores significantly (for example, twice or more) with the FTM as described above, and development of a new form of FTM has been required. In the optical branching module 4 as described above, when the optical fiber switching connection system is used to switch the optical connector 10 housed in the optical branching module 4 at the time of switching the core, FIG. As shown in the figure, the corresponding optical branching module 4 is pulled out of the frame 1 and placed on a shelf, the drawn-out optical branching module 4 is opened, and the optical connector 10 is pulled out from the inside. When pulling out the optical connector 10,
The optical components such as the optical coupler 9 and the filter (not shown) connected to the optical cord 8w are also pulled out together,
In the live state, it has been difficult to perform the work without affecting the optical communication. In addition, the necessity of securing a working space in the FTM 1 has also made it difficult to increase the mounting density of the optical branching module 4. Incidentally, the optical connector is a multi-fiber optical connector as defined in JIS C5981. SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and can increase the number of corresponding cores and reduce the influence on optical communication during work such as connection switching as much as possible. It is an object to provide an optical wiring rack and an optical branch module. According to a first aspect of the present invention, there is provided an optical wiring rack for branching and connecting an optical fiber cable to an optical fiber core via a connector. A lead-out optical fiber storage part for storing the lead-out optical fiber while maintaining a curvature radius equal to or greater than a specified value, and an optical fiber having one end connected to the optical fiber on the optical fiber cable side and the other end connected to the optical fiber core. A module storage unit that stores a large number of optical branching modules that store optical couplers interposed in the middle, arranged side by side in multiple stages separated by a horizontally arranged partition plate, and the module storage unit. A plurality of switching optical connectors which are provided at separated positions and connect the optical fibers to each other in a switchable manner ;
Provided near the connector holding means, the extra length of the optical fiber
Extra length storage means for storing, the extra length storage means
Has a sheath shape with an opening at one end in the longitudinal direction,
It is a case to store the extra length of the fiber so that it can be pulled out,
Multiple connectors are provided on both sides of the connector holding means.
Was solutions of the problem to be solved that. [0012] [0013] [0014] Hereinafter, the operation of the invention of claim 1, wherein. According to the first aspect of the invention, the connection switching between the optical fiber on the optical fiber cable side on the optical fiber cable side outside the station and the optical fiber on the optical branching module is performed by the optical connector held by the connector holding means. . Therefore, it is not necessary to secure a storage space for the switching optical connector in the optical branch module, so that the optical branch module can be downsized. Further, since it is not necessary to secure a work space for connection switching or the like in the module storage unit, the number of optical branch modules stored in the module storage unit can be increased. In addition, since a large number of switching optical connectors are compactly assembled and held in the connector holding means, the work of taking out the switching optical connector to be worked can be simplified. In addition, the extra length storing means (multiple cases respectively provided on both sides of the connector holding means) can organize and store the extra length of the optical fiber on the optical fiber cable side and the extra length of the optical fiber core, and furthermore, the connection It becomes easy to take out and re-store the target optical fiber in the work such as switching. Therefore, since there is no need to pull out the optical branching module from the module storage part at the time of connection switching work, work such as connection switching can be performed efficiently without affecting optical communication even in a live state. it can. Embodiments of the present invention will be described below with reference to the drawings. First, an embodiment of an optical wiring rack (hereinafter, referred to as “FTM”) according to the present invention will be described. 1 to 3 show a basic configuration of the FTM 51 of the present embodiment. FT
M51 has a box-shaped frame 52, FIG. 2 shows a front side, and FIG. 3 shows a rear side. On the front side, an end of the optical fiber cable 53 and an optical fiber led out of the optical fiber cable 53 are wired, and on the back side, a single core wire for transmitting an optical signal output from a transmission device (not shown) is coded. A single-core optical cord 67 is accommodated. Single core optical cord 6
7 is formed into a cable or guided to the FTM 51 by a bundle of single-core optical cords, and distributed to the respective wiring trays 99 on the rear side of the frame 52. The optical fiber 54 corresponds to the subscriber-side multi-core optical fiber according to the third aspect. The single-core optical cord 67 corresponds to an optical fiber core according to the first aspect. The FTM 51 is divided into two parts, left and right. One side is a module storage section 56, and the other side is a lead-out optical fiber storage section 57 for storing an optical fiber led out from an optical cable. The lead-out optical fiber storage portion 57 has a front side and a rear side which are partitioned by a vertical partition wall 58. On the front side, the optical fiber cable 53 and the optical fiber ribbon of the optical fiber cable 53 are mainly erected. The converted optical fiber cord 54 is routed, and the single-core optical cord 67 is introduced to the back side. The module storage section 56 is partitioned into a plurality of shelves at equal intervals by partition plates 59 horizontally arranged in the frame 1, and as shown in FIG. Above, a number of optical branching modules 60 are housed side by side. As shown in FIG. 4, the space between the partition plates 59 is vertically divided by an internal partition plate 61 which is also arranged horizontally, and an optical switch 62 is mounted on the internal partition plate 61. I have. As shown in FIG. 5, the optical branching module 60
Is inserted between the lower partition plate 59 and the internal partition plate 61 in a vertical position, and can be pulled out to the near side in the drawing. On the upper surface of the partition plate 59, a guide flange 6 for guiding the pull-out operation and positioning in the arrangement direction is provided.
3 are erected. As shown in FIG. 6, a vertical terminal plate 64 is fixed to the back side of each stage. As shown in FIGS. 4 and 6, an eight-unit MU adapter 65 protruding from one side of the optical branching module 60 is provided on the terminal plate 64.
An optical adapter insertion hole 66 into which the (multi-unit adapter) is inserted from the front side is opened. An SC optical plug 68 for terminating a single-core optical cord 67 is removably inserted into the MU adapter 65 inserted into the optical adapter insertion hole 66. The single-core optical cord 67 connected to the MU adapter 65 is clamped and aligned by a rod-shaped fiber clamp 69 protruding from the terminal plate 64 below the optical adapter insertion hole 66, and further below the fiber clamp 69. It is curved while maintaining a curvature radius equal to or greater than a specified value by a curved plate 70 attached to the side, and is housed in a receiving gutter 71 installed near a lower partition plate 59. Next, the optical branch module 60 according to the present invention.
Will be described with reference to FIG. As shown in FIG. 7, the optical branch module 60 is made of a lightweight material such as plastic and has a thin plate-shaped main body 72 as a whole, and can be opened and closed by an open / close lid (not shown). On the rear end surface (right end in FIG. 7) of the optical branch module 60, two MU adapters 65 in series are mounted in series (constituting a total of 16 adapter holes), and above and below the mounting locations. Is provided with an engagement hook 73 which engages with the opening edge of the optical adapter insertion hole 66 of the terminal plate 64. The optical connector for connection according to claim 3, wherein the eight-unit MU adapter 65 is a unit formed by serially connecting eight SC-type optical adapters for a single-core optical fiber having a built-in positioning ring sleeve in series. Is equivalent to Inside the main body 72 of the eight-unit MU adapter 65, 16 single-core wires 74 housed in the main body 72 are inserted so as to be able to be inserted and withdrawn using an SC plug 75. These single-core wires 74 are obtained by single-branching an end of an optical fiber 76 (eight-core optical fiber ribbon) housed in a main body 72 via an optical coupler 77 interposed in the middle of the optical fiber 76. Part. The optical coupler 77 is a wavelength-independent quartz substrate waveguide type optical coupler having 16 channels.
It is stably gripped by a gripping piece (not shown) protruding from the inside of the main body 72. Further, between the optical coupler 77 and the optical switch 62 installed outside the optical branching module 60, a total of four optical lines 78 each composed of an eight-core optical fiber tape are connected. Accordingly, the test light transmitted from the optical switch 62 to the optical line 78 is sent to the optical line 76 on the subscriber side via the optical coupler 77, and the reflected wave of the subscriber line outside the station is transmitted to the optical coupler 77 and the light beam. Returning to the optical switch 62 via the path 78, the loss is monitored by the optical line monitoring device. The other end of the optical line 78 connected to the optical coupler 77 is guided to the optical switch 62 and subjected to anti-reflection processing. Optical lines 74 and 7 housed in the main body 72
Each of 6, 6 and 78 is stably accommodated by maintaining a radius of curvature equal to or greater than a specified value by a radius maintaining plate 79 and a pressing plate 80 protruding from the inner surface of the main body 72. Also, the optical lines 76 and 7
8 are pulled out from cord outlets 81 and 82 which are opened at vertically separated positions on the front end face of the optical branching module 60, and are retained by anchoring tools 83 and 84 arranged in these cord outlets 81 and 82. Have been. The ends of the optical lines 76 and 78 are terminated by switching optical connectors 85 and 86 for eight cores, respectively, and as shown in FIG. 1 and FIG. The switching optical connector 85 which is pulled out, coded and terminates the optical line 76 is held by a connector housing unit (connector holding means) 87 installed in the lead-out optical fiber housing 57, and as shown in FIG. The switching optical connector 86 for terminating the optical path 78 drawn out from the upper cord outlet 82 is detachably clamped and held by a connector holder 89 attached to the front end (the left side in FIG. 4) of the internal partition plate 61. It is connected to a lead cord 88 drawn from the optical switch 62 immediately above the optical branch module 60. The switching optical connectors 85, 8
As 6, a multi-core plastic optical connector such as a so-called MT connector (Mechanically Transferable) defined in JIS C5981 or the like is adopted. The ends of the optical fiber cords 54 and 88 are both terminated by switching optical connectors 85 and 86 that are compatible with the switching optical connectors 85 and 86, so that the connection can be easily switched. . Lower code outlet 8
The optical line 76 drawn out from the optical branch module 6
0 is stored in a receiving gutter 59a provided on the front side of the partition plate 59 below the step in which the 0 is stored, and is drawn out to the lead-out optical fiber storage portion 57. As shown in FIGS. 1 and 2, a plurality of connector storage units 87 are vertically arranged in multiple stages near the module storage unit 56 on the front side (front side of the drawing) of the lead-out optical fiber storage unit 57. . Also, as shown in FIG.
On both sides of each connector storage unit 87, a plurality of extra length storage cases 90 (excess length storage means) for storing extra connection lengths 54a and 76a made of optical fiber cords on both sides connected in the connector storage unit 87 are provided. Have been. The connector housing unit 87 is a box-shaped casing 9 that is open on both sides.
1, a drawer-type tray 92 is housed. As shown in FIG. 9, a thin plate-shaped connector case 93 in which a plurality of switching optical connectors 85 are arranged and housed is arranged in the tray 92.
Are arranged and accommodated in a large number, and a large number of switching optical connectors 85 are arranged and accommodated by these connector cases 93. The connector case 93 can be freely inserted into and removed from the tray 92, and is formed to be openable and closable, so that the switching optical connector 85 housed therein can be easily taken out. As shown in FIG. 8, the extra length storage case 90 is an empty case having an opening 94 at one end in the longitudinal direction and having a thin and long sheath shape. They are mounted in multiple positions toward the back of the FTM 51 in an inclined posture. In the extra length storage case 90, the internal space is an extra length storage space for the optical fiber, and the width H of the internal space is set slightly larger than the minimum bending diameter of the optical fiber core wire.
The length L is set to a size that allows the extra lengths 54a and 76a necessary for connection to be stored in a hanging state. On the front side of the lead-out optical fiber housing portion 57 of the FTM 51, a cable gripping part 95 for holding the optical fiber cable 53 and an optical fiber cord 54 led out from the optical fiber cable 53 are connected to each connector. A mandrel-type cord distribution member 96 for distributing and wiring to the storage unit 87 and a duct 98 are provided. As shown in FIG. 3, a code distribution member 96 and a code support 97 are provided on the back side of the lead-out optical fiber storage portion 57 of the FTM 51, and a single-core optical code 67 distributed by the code distribution member 96 is further provided. A wiring tray 99 for guiding to a gutter 71 provided on the end plate 64 of each stage of the module storage section 56 is provided. The single-core optical cord 67 is transmitted from the introduction unit 100 installed at the upper portion on the rear side of the lead-out optical fiber storage portion 57 to the FTM.
51, most of which are code support 97
The cable is routed so as to be distributed by the cord distribution member 96 after passing through the lower part of the lead-out optical fiber storage portion 57 while being supported by the like. Further, a part of the single-core optical cord 67 is directly introduced into an appropriate wiring tray 99 through a branch gutter 101 protruding from the introduction unit 100. The operation and effect of the FTM 51 and the optical branch module 60 according to this embodiment will be described below. In this embodiment, the switching optical connector 85 is assembled and arranged and stored in the connector storage unit 87, so that the target optical fiber cord 54 and the switching optical connector 8 of the optical line 76 are provided.
5 can be easily taken out, and work efficiency such as connection switching can be improved. Moreover, since the plurality of target switching optical connectors 85 can be pulled out to positions close to each other,
When the connection is switched between these switching optical connectors 85, the application of the optical fiber switching connection system is easy, and the work efficiency of the connection switching can be further improved.
The extra lengths 54a and 76a used for operations such as connection switching in the connector storage unit 87 are the extra length storage case 9.
Since it is sufficient to pull out the extra length 76a from the optical branch module 60, the workability is improved. Therefore, in the present embodiment, the connection between the optical fiber cord 54 and the optical line 76 can be switched without touching the optical branching module 60, and the optical components such as the optical coupler 77 housed in the optical branching module 60 can be switched. Since the housed state is stably maintained, work can be performed without affecting optical communication even in the live state. In the present embodiment, the extraction cord 88 of the optical switch 62 and the optical line 7
Similarly, the connection with the optical branching module 6 is switched.
Since the work can be performed without touching 0, there is no fear of affecting optical communication. Further, it is not necessary to secure a storage space for the switching optical connectors 85 and 86 in the optical branching module 60, and most of the extra length 76a of the optical line 76 is accommodated in the extra length storage case 90 for optical branching. Since the amount of storage in the module 60 is reduced, the size of the optical branching module 60 can be reduced, and the mounting density in the module storage section 56 can be improved. The extra lengths 54a and 76a are stored in the connector storage unit 87.
Are stored in the extra length storage case 90 by hanging them near both sides, so that a sufficient length of extra length storage is possible, and it is necessary when the switching optical connectors 85 and 86 are connected or when the connection is switched. Work such as storing and drawing out the extra lengths 54a and 76a can be performed efficiently. Also, FTM51
Then, work space for connection switching etc. is stored in the module storage 5
There is no need to secure it in the optical branching module 6.
0 contributes to the improvement of the mounting density. As a result, FTM51
Can increase the number of corresponding cores without increasing the size. Specifically, while the conventional FTM corresponds to an optical fiber of 1000 fibers, the FTM of the present embodiment
51 can correspond to 4000 optical fibers,
In addition, workability such as connection switching can be improved. Further, since the connector housing unit 87 and the optical branching module 60 are separated from each other, the work of pulling out the switching optical connector 85 and the extra length 76 accompanying the connection switching work are performed.
Since the vibration generated by the drawing operation of a does not act on the optical components such as the optical lines 76 and 78 and the optical coupler 77 in the optical branch module 60, these optical components can be stored very stably. As a result, The operation can be performed efficiently, and the reliability of the optical communication during the connection switching operation can be improved to an extremely high level. The contents of the optical components housed in the optical branch module 60 are not limited to the above embodiment. The configuration of the connector holding means is not limited to the connector storage unit 87. Further, the configuration of the extra-length storage means is not limited to the extra-length storage case 90, but also includes one integrated with the connector holding means. As described above, according to the optical wiring frame of the first aspect, the optical fiber is connected and switched by the connector holding means which collectively holds the plurality of switching optical connectors. As a result, it is not necessary to secure a storage space for the switching optical connector in the optical branching module or to secure a space for drawing out the optical branching module and performing work, thereby improving the mounting density of the optical branching module. And the number of corresponding hearts can be increased. In addition, since the work such as connection switching can be limited to only the work in the connector holding means, the influence of vibration or the like on the optical components such as the optical fiber and the optical coupler housed in the optical branch module housed in the optical branch module. This provides an excellent effect that the work such as connection switching can be performed efficiently even in a live state. Also, the extra length of the optical fiber is stored in the extra length storage means.
By doing so, the extra length of storage in the optical branching module
Since it is possible to reduce the size of the optical branch module
Mounting density of optical branch module in module storage section
Can be improved. In addition, extra length storage means
To secure the extra length of optical fiber near the connector holding means
Optical fiber in the connector holding means.
Connection work between fiber or optical fiber and optical fiber core
And optical connection module
Work to draw extra length from within
Influences optical communication even in the live state.
Work can be performed efficiently without
The extra length should be stored near the
The advantage is that the extra storage capacity increases
It has the effect. [0036]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an FTM according to an embodiment of the present invention. FIG. 2 is a front view showing a front side of the FTM of FIG. 1; FIG. 3 is a rear view of the FTM of FIG. 1; FIG. 4 is an enlarged side view showing a housed state of the optical branch module in the FTM of FIG. 1; FIG. 5 is an enlarged perspective view of a main part showing a stored state of the optical branching module in the FTM of FIG. 1; FIG. 6 is an enlarged rear view of a main part of FIG. 3; FIG. 7 is a front sectional view showing the optical branch module according to the embodiment of the present invention. FIG. 8 is a view showing the embodiment of the present invention, and is a perspective view showing the connector storage unit and the extra-length storage case. FIG. 9 is a perspective view showing a tray and a connector case of the connector storage unit of FIG. 8; FIG. 10 is a side view showing an optical wiring rack. FIG. 11 is a front view showing an optical wiring rack. FIG. 12 is a side view showing a conventional optical branch module. FIG. 13 is a side view showing a conventional optical branch module, showing connection switching by an optical connector. FIG. 14 is a schematic diagram showing a basic configuration of an optical branching module. [Description of Signs] 51: Optical Distribution Frame (FTM), 53: Optical Fiber Cable, 54: Optical Fiber (Optical Fiber Cord), 54a ...
Extra length, 55 ... Optical fiber core (single-core optical cord), 56 ...
Module storage section, 57... Derived optical fiber storage section, 59
... Partition plate, 60 ... Optical branch module, 62 ... Optical switch, 65 ... Connection optical connector (SC type optical adapter, MU
Adapter: 72, Main body, 76: Optical fiber (optical fiber ribbon), 76a: Extra length, 77: Optical coupler, 78
... optical fiber (optical fiber tape core), 85 ... switching optical connector, 87 ... connector holding means (connector storage unit), 90 ... extra length storage means (extra length storage case).

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Takashi Mima 3-19-2 Nishi Shinjuku, Shinjuku-ku, Tokyo Nippon Telegraph and Telephone Corporation (72) Inventor Naoki Nakao 3-19, Nishishinjuku, Shinjuku-ku, Tokyo 2 Nippon Telegraph and Telephone Corporation (72) Inventor Masato Kuroiwa 3-19-2 Nishi-Shinjuku, Shinjuku-ku, Tokyo Nippon Telegraph and Telephone Corporation (56) References JP-A-9-197138 (JP, A JP-A-9-5533 (JP, A) JP-A-9-33733 (JP, A) JP-A-5-107416 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G02B 6/00 G02B 6/46-6/54

Claims (1)

Claims: 1. An optical wiring rack (51) for branching and connecting an optical fiber cable (53) to an optical fiber core wire (55) via a connector connection. A lead-out optical fiber storage part (57) for storing the optical fiber (54) led out from (53) while maintaining a curvature radius equal to or greater than a specified value, and one end connected to the optical fiber on the optical fiber cable side and the other end connected to the optical fiber. An optical branch module (60) containing an optical coupler (77) interposed in the middle of an optical fiber (76) connected to a fiber core is connected to a horizontally arranged partition plate (59).
Module storage section (56) for storing a large number of rows and columns arranged in multiple stages by a plurality of rows, and a switching optical connector provided at a position separated from the module storage section and for connecting optical fibers in a switchable manner. (8
A connector holding means (87) for holding a plurality of 5) in a removable manner; and a spare length storing means (9) provided near the connector holding means for storing the extra length (54a, 76a) of the optical fiber.
0), wherein the extra length storage means is a case which has a sheath shape having an opening at one longitudinal end and accommodates the extra length of the optical fiber so as to be able to be pulled out, and is provided on both sides of the connector holding means. An optical wiring rack characterized by being multiply mounted.