JP2004004862A - Optical wiring rack and optical branching module - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To efficiently carry out a work of switching-over or the like of connection of an optical connector for switching-over without affecting an optical communication even in a live-line state. <P>SOLUTION: The optical branching module 60 for branching and connecting a multi-core optical fiber to a coated optical fiber with an optical connector junction is characterized by the fact that the optical branching module 60 is provided with a main body 72 which houses an optical coupler 77 which is inserted in an optical fiber 76 of which the one end is connected to the multi-core optical fiber and the other end is connected to the coated optical fiber, an optical connector for connection 65 is mounted on an end part of the main body 72, and the optical fiber 76, which is connected by being switched to the multi-core optical fiber on the side of a subscriber via an optical connector for switching-over 85 at a remote position from the main body 72, and an optical fiber 78, of which the end is so formed to be connected to a lead-out cord wired from an optical switch by means of an optical connector for switching-over 86, are led out of the main body 72 from the other end of the main body 72, through cord lead-out ports 81 and 82 which are opened on the other end side face of the main body 72. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an optical wiring rack for branching and connecting an optical fiber cable to an optical fiber core via a connector connection.
[0002]
[Prior art]
Conventionally, a plurality of optical fibers are individually housed and have an optical coupler therein, and are arranged and accommodated in each stage in parallel and housed, and an optical coupler in each optical branch module is branched. There is known an optical branch module housing rack including an optical switch for selectively optically coupling the test branch optical fiber with the master-side optical fiber (for example, see Patent Document 1).
[0003]
[Patent Document 1]
JP-A-9-33733
[0004]
Also, 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, an optical wiring rack that terminates a large number of optical fibers inside and outside the office and constitutes a large group is used. Is done. In particular, a fiber termination module (FTM) is used as an optical wiring frame used for a subscriber transmission line.
10 and 11 are diagrams showing a conventional optical wiring rack applied to the 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 branch module.
[0005]
The frame 1 is formed in a shelf shape divided into a plurality of steps at equal intervals by a horizontally arranged partition plate 5, and a plurality of steps for storing the light 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. A plurality of holes 6 for mounting the optical adapters 3 are arranged in a row on the terminal plate 2, and two well-known SC-type optical adapters 3 are arranged and fixed in the holes 6. 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, and a plurality of not-shown SC-type terminals to which an external optical fiber is connected. It is arranged at a position corresponding to the terminal for the fiber 7.
[0006]
Hereinafter, the basic configuration of the optical branch module 4 is shown in FIG.
As shown in FIG. 14, 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 accommodated in the optical branching module 4.
In order to test and manage an optical line, first, an optical branching module that accommodates a core to be tested is selected by an optical switch 4a and transmitted from an optical pulse testing device 4b (optical pulse core selecting device). The test light transmitted through the optical coupler 9 is transmitted to the optical fiber 4c outside the station to be measured, and the backscattered light generated in the optical fiber 4c is transmitted through the optical coupler 9 to an optical pulse test apparatus. The optical receiver 4b receives the light and then analyzes the waveform of the received backscattered light to monitor the loss abnormality of the subscriber optical line.
[0007]
A conventional four-core branching module will be described with reference to FIGS. 12 and 13. This optical branching module is a thin plate-shaped main body as a whole, and can be opened and closed by an open / close lid (not shown).
On the rear 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 (terminated 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 eight-fiber optical fiber tape on the optical coupler 9 side by an eight-fiber optical connector 10. Connected to. As the optical connector 10, a multi-core plastic optical connector such as a so-called MT connector (Mechanically Transferable) defined in JIS C5981 or the like is employed.
[0008]
Next, the optical fiber tape 8a on the off-site optical fiber cable (terminated cable) side is connected to an optical fiber tape (not shown) on the optical coupler 9 side by an optical connector 10 for four cores.
On the other hand, one 4-fiber 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 furthermore, the multi-fiber single-fiber splitter F fixed to the side plate. The light is branched into four single-core optical fibers 8y.
The distal end 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.
[0009]
The optical branching modules 4 are provided in each stage of the frame 1, for example, with a width of 13.5 mm and about 50 units in one stage. Inside the optical branching module 4, an optical cord 8w, an optical coupler 9 connected to the optical cord 8w, and an optical connector 10 for optically connecting the optical fiber tapes 8a, 8b and the optical cord 8w so as to be switchable. Is stored.
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.
[0010]
[Problems to be solved by the invention]
By the way, in the case of the FTM as described above, in addition to the large number of parts, the sufficient space is not ensured in each stage in view of the demand for the increase in the number of accommodated core wires and the sophistication of mounting density. In this case, the mounting work of the optical components such as the optical adapter 3 must be performed, 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 that can be easily accessed by an operator. With the increase in the number and the mounting density, the work has become difficult. Therefore, it is difficult to increase the number of corresponding cores significantly (for example, twice or more) with the FTM as described above, and a new type of FTM has been required to be developed.
[0011]
Further, 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 when switching the core wire, as shown in FIG. Next, 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. At the time of pulling out, optical components such as the optical coupler 9 and a filter (not shown) connected to the optical cord 8w are also pulled out together, and work can be performed without affecting optical communication in a live state. Had become difficult. 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 multicore optical connector as defined in JIS C5981.
[0012]
SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and it is possible to increase the number of corresponding cores and to reduce the influence on optical communication during work such as connection switching as much as possible. And an optical branching module.
[0013]
[Means for Solving the Problems]
In the optical wiring rack according to claim 1, the optical wiring rack for branching and connecting an optical fiber cable to an optical fiber core via a connector connection has an optical fiber derived from the optical fiber cable having a curvature radius equal to or greater than a specified value. A lead-out optical fiber storage section for maintaining and storing, and an optical branch for storing an optical coupler interposed in the middle of 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. Module storage unit that stores a large number of modules arranged side by side in each stage divided into multiple stages by horizontally arranged partition plates, and optical fibers that can be switched between optical storage units that are provided at a distance from the module storage unit And a connector holding means for holding a plurality of switching optical connectors to be connected to the module storage so as to be able to be taken out. The optical branching module is housed between the internal partition plate horizontally arranged on the upper side thereof, and an optical switch mounted on the internal partition plate is further provided. A connector holder that detachably clamps and holds a switching optical connector that terminates an optical fiber drawn from a module so as to be connectable to a pull cord pulled out from the optical switch in a state where the switching optical connector is connected to the pull cord. The object of the present invention is to solve the above-described problem, in that the internal partition plate is attached to an end on the front side, which is a side from which the light branching module, which is retractably stored between the internal partition plate and the partition plate, is pulled out. Means.
[0014]
An optical branching module according to claim 2, wherein the multi-core optical fiber is branched and connected to an optical fiber core by connecting an optical connector, and one end is connected to the multi-core optical fiber and the other end is connected to the optical fiber. A main body for accommodating an optical coupler interposed in the middle of the optical fiber connected to the fiber core; an optical connector for connecting the optical fiber to the optical fiber core is attached to one end of the main body; From the other end opposite to the optical connector for connection, an optical fiber that is switchably connected to the multi-core optical fiber on the subscriber side via a switching optical connector at a position separated from the main body, and a wiring from the optical switch An optical fiber terminated so as to be connectable to the drawn out cord by a switching optical connector is pulled out of the main body from a cord outlet opening in the other end surface of the main body. That it formed by was solutions of the problems.
[0015]
Hereinafter, the operation of the invention described in each claim will be described.
According to the first aspect of the present invention, at each stage of the module storage section, the optical fiber drawn out from the plurality of optical branch modules housed between the partition plate and the internal partition plate, and the drawer on the optical switch side. Since the connection part of the cord (the part connected by the switching optical connector) can be intensively held in the connector holder, it is necessary to perform the work such as connection switching when taking out the switching optical connector from the connector holder. It is easy to find the target optical fiber, etc., and even if the number of optical fibers to be connected to the lead cord on the optical switch side is large, the optical fibers such as the optical fibers and optical couplers in the optical branching module can be used. Connection switching can be performed while avoiding adverse effects on components.
[0016]
According to the invention described in claim 2, one end of the optical fiber drawn out of the main body is switchably connected to the multi-core optical fiber on the subscriber side via the switching optical connector, and the drawing on the optical switch side. Since the connection and connection switching between the cord and the optical fiber can be performed at a location remote from the optical branching module, the effects of contact and vibration that occur during the work such as the connection switching related to the switching optical connector may be affected outside the branching module. It is absorbed excessively and does not transmit to optical components such as optical fibers and optical couplers housed in the main body. Therefore, even in the live state, the work such as the connection switching of the switching optical connector can be efficiently performed without affecting the optical communication.
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described 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. The FTM 51 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 from the optical fiber cable 53 are wired, and on the back side, a single core for transmitting an optical signal output from a transmission device (not shown) is coded. A single-core optical cord 67 is accommodated. The single-core optical cord 67 is formed into a cable, or guided to the FTM 51 by a converging body of the single-core optical cord, and distributed to the respective wiring trays 99 on the rear side of the frame 52.
The optical fiber 54 corresponds to a multi-core optical fiber on the subscriber side. The single-core optical cord 67 corresponds to an optical fiber.
[0018]
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 tape core 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.
[0019]
The module storage portion 56 is partitioned into a plurality of equally-spaced shelves by a partition plate 59 horizontally arranged in the frame 1. As shown in FIG. Many optical branching modules 60 are housed side by side. Further, 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.
[0020]
As shown in FIG. 5, the light 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 of the drawing. On the upper surface of the partition plate 59, a guide flange 63 for guiding the pulling-out operation and positioning in the arrangement direction is provided upright. 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, the terminal plate 64 has an optical adapter insertion hole into which an 8-unit MU adapter 65 (multi-unit adapter) protruding from one side of the optical branching module 60 is inserted from the front side. 66 is open. An SC type 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 prescribed value by a curved plate 70 attached to the side, and is accommodated in a receiving gutter 71 installed near a lower partition plate 59.
[0021]
Next, an embodiment of the optical branch module 60 according to the present invention will be described with reference to FIG.
As shown in FIG. 7, the optical branching 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 opening / closing lid (not shown). On the rear end surface (right end in FIG. 7) of the optical branching module 60, two MU adapters 65 are attached in series (constituting 16 adapter holes in total). 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 ring sleeve for positioning. 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 removed with 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 tape) housed in a main body 72 via an optical coupler 77 interposed in the middle of the optical fiber 76. Part.
[0022]
The optical coupler 77 is a wavelength-independent quartz substrate waveguide type optical coupler having 16 channels, and 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. Therefore, 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 office is reflected by the optical coupler 77 and the light beam. Returning to the optical switch 62 via the path 78, the optical line monitoring device monitors the loss. 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.
[0023]
The optical lines 74, 76, 78 housed in the main body 72 are stably housed while maintaining a curvature radius 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. You. Further, the optical lines 76 and 78 are both drawn out from the code outlets 81 and 82 which are opened at vertically separated positions on the front end face of the optical branching module 60, and the stays arranged in these code outlets 81 and 82. It is retained by tools 83 and 84.
[0024]
The ends of the optical lines 76 and 78 are terminated by switching optical connectors 85 and 86 for eight cores, respectively, and pulled out from a lower cord outlet 81 as shown in FIGS. 1 and 2. The switching optical connector 85 which is coded and terminates the optical line 76 is held in 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 line 78 drawn out from the outlet 82 is detachably clamped and held by a connector holder 89 attached to the front end portion (the left side in FIG. 4) of the internal partition plate 61, and the optical branching module. It is configured to be connected to a lead cord 88 drawn from the optical switch 62 directly above the switch 60.
As the switching optical connectors 85 and 86, a multi-core plastic optical connector such as a so-called MT connector (Mechanically Transferable) defined in JIS C5981 or the like is employed.
[0025]
The ends of the optical fiber cords 54, 88 are both terminated by switching optical connectors 85, 86 that are compatible with the switching optical connectors 85, 86, so that connection can be easily switched.
The optical line 76 led out from the lower code outlet 81 is housed in a receiving gutter 59a provided on the front side of the lower partition plate 59 at the lower stage where the optical branching module 60 is housed, and is led out. The fiber storage portion 57 is drawn out.
[0026]
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. As shown in FIG. 8, on both sides of each connector storage unit 87, an extra length storage case 90 for storing extra connection lengths 54 a and 76 a formed of optical fiber cords on both sides connected in the connector storage unit 87. (Excess length storage means) are provided in multiple. The connector storage unit 87 has a configuration in which a drawer-type tray 92 is stored in a box-shaped casing 91 that is open on both sides, and a plurality of switching optical connectors 85 are arranged in the tray 92 as shown in FIG. A large number of thin-plate-shaped connector cases 93 to be housed are arranged and housed, and a large number of switching optical connectors 85 are arranged and housed by these connector cases 93. The connector case 93 is freely openable and closable with respect to the tray 92, and is formed to be freely openable and closable so that the switching optical connector 85 housed therein can be easily taken out.
[0027]
As shown in FIG. 8, the extra-length storage case 90 is an empty case having an opening 94 at one longitudinal end and having a thin and long sheath shape, with the opening 94 facing upward and inclined obliquely forward. Thus, the FTM 51 is mounted in a row toward the back. In the extra length storage case 90, the internal space is the extra length storage space for the optical fiber, the width H of the internal space is set slightly larger than the minimum bending diameter of the optical fiber core wire, and the length L is necessary for connection. The dimensions are set such that the extra lengths 54a and 76a can be stored in a hanging state.
[0028]
Further, on the front side of the lead-out optical fiber storage part 57 of the FTM 51, a cable gripping part 95 for holding the optical fiber cable 53 and the optical fiber cord 54 led out from the optical fiber cable 53 are connected to the connector storage unit 87 of each stage. A mandrel-type cord distribution member 96 for distributing and wiring the cable 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 section 57 of the FTM 51, and the single-core optical cord 67 distributed by the code distribution member 96 is also provided. A wiring tray 99 is provided to lead to a gutter 71 provided on the end plate 64 of each stage of the module storage section 56. The single-core optical cord 67 is introduced into the inside of the FTM 51 from the introduction unit 100 installed on the upper part on the back side of the lead-out optical fiber storage part 57, and most of the single-core optical cord 67 is supported by the code support 97 and the like. After passing through the lower part, it is wired so that it can be sorted by the code sorting member 96. 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.
[0029]
Hereinafter, functions and effects of the FTM 51 and the optical branch module 60 of the present embodiment will be described.
In the present embodiment, the switching optical connector 85 is assembled and arranged in the connector storage unit 87, so that it is easy to take out the target optical fiber cord 54 and the switching optical connector 85 of the optical line 76. The work efficiency of connection switching and the like is improved. Moreover, since the plurality of target switching optical connectors 85 can be pulled out to positions close to each other, it is easy to apply the optical fiber switching connection system when performing connection switching between these switching optical connectors 85, The work efficiency of connection switching can be further improved. In addition, since the extra lengths 54a and 76a used for operations such as connection switching in the connector storage unit 87 need only be pulled out from the extra length storage case 90, there is no need to pull out the extra length 76a from the optical branching module 60, thereby improving workability. I do.
[0030]
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 storage state of the optical components such as the optical coupler 77 stored in the optical branching module 60 can be changed. Since the operation is stably maintained, the operation can be performed without affecting the optical communication even in the live state. In the present embodiment, the connection switching between the extraction cord 88 of the optical switch 62 and the optical line 78 can be similarly performed without touching the optical branching module 60, so that there is no fear of affecting the optical communication. .
[0031]
Further, it is not necessary to secure a storage space for the switching optical connectors 85 and 86 in the optical branch module 60, and most of the extra length 76 a of the optical line 76 is accommodated in the extra length storage case 90 and the optical branch module 60 Therefore, the optical branch module 60 can be downsized, and the mounting density in the module storage section 56 can be improved. In addition, since the extra lengths 54a and 76a are housed in the extra length storage case 90 by hanging near the both sides of the connector storage unit 87, the extra length storage is possible, and the switching optical connector is provided. Work such as storing and pulling out the extra lengths 54a and 76a necessary at the time of connection of 85 and 86 or connection switching can be performed efficiently. Further, in the FTM 51, there is no need to secure a work space for connection switching or the like in the module storage unit 56, which also contributes to an increase in the mounting density of the optical branching module 60. As a result, the FTM 51 can increase the number of cores without increasing the size. Specifically, while the conventional FTM corresponds to 1,000 optical fibers, the FTM 51 of the present embodiment can correspond to 4000 optical fibers, and further improves workability such as connection switching. be able to.
[0032]
Further, since the connector housing unit 87 and the optical branching module 60 are separated from each other, vibrations caused by the pulling out work of the switching optical connector 85 and the pulling out of the extra length 76a due to the connection switching work cause the optical branching module 60 It does not act on the optical components such as the optical lines 76 and 78 and the optical coupler 77, so that these optical components can be stored extremely stably, and as a result, the work can be performed efficiently and during the connection switching work. Can be improved to an extremely high level of optical communication reliability.
[0033]
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 the one integrated with the connector holding means.
[0034]
【The invention's effect】
As described above, according to the optical wiring frame according to the first aspect, the light extracted from the plurality of optical branch modules housed between the partition plate and the internal partition plate at each stage of the module storage unit. Since the connection portion between the fiber and the lead cord on the optical switch side (the portion connected by the switching optical connector) can be intensively held in the connector holder, the switching optical connector is taken out from the connector holder, such as connection switching. When performing work, it is easy to find the optical fiber to be worked, etc., and even if the number of optical fibers to be connected to the lead cord on the optical switch side is large, the switching optical connector The effects of contact and vibration that occur during work such as connection switching are absorbed by the extra length outside the branch module and transmitted to optical components such as optical fibers and optical couplers housed in the main body. No. Therefore, even in the live state, the work such as the connection switching of the switching optical connector can be efficiently performed without affecting the optical communication.
[0035]
According to the optical branch module of the second aspect, one end of the optical fiber drawn out of the main body is switchably connected to the multi-core optical fiber on the optical fiber cable side (subscriber side) via the switching optical connector. In addition, the connection and connection switching between the lead cord on the optical switch side and the optical fiber can be performed at a location remote from the optical branching module, thereby causing work such as connection switching related to the switching optical connector. Since the effects of vibration and the like do not act on optical components such as optical fibers and optical couplers housed in the main body, work such as connection switching related to the switching optical connector can be efficiently performed without affecting optical communication even in the live state. It can be carried out. Further, since there is no need to secure a storage space for the switching optical connector, there is an excellent effect that the size can be easily reduced.
[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 branching module in the FTM of FIG. 1;
FIG. 5 is an enlarged perspective view of a main part showing a housed state of the optical branch 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.
[Explanation of symbols]
Reference numeral 51 denotes an optical wiring frame (FTM); 53, an optical fiber cable; 54, an optical fiber (optical fiber cord); 54a, an extra length; 55, an optical fiber core (single-core optical cord); ... Derived optical fiber storage part, 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) Tape core wire), 76a extra length, 77 optical coupler, 78 optical fiber (optical fiber core wire), 85 optical switching connector, 87 connector holding means (connector storage unit), 90 extra length storage Means (extra length storage case).

Claims (2)

An optical wiring frame (51) for branch-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) that stores the optical fiber (54) led out from the optical fiber cable (53) while maintaining a curvature radius equal to or greater than a specified value;
An optical branching module (60) containing an optical coupler (77) interposed in the middle of an optical fiber (76) 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 portion (56) for storing a large number of modules arranged side by side in each stage divided into multiple stages by a horizontally arranged partition plate (59);
A connector holding means (87) is provided at a position separated from the module storage portion and collectively holds a plurality of switching optical connectors (85) for switchably connecting optical fibers to each other. ,
Each stage of the module storage section houses an optical branching module between a partition plate and an internal partition plate (61) horizontally arranged above the partition plate, and an optical switch mounted on the internal partition plate. (62),
Further, a switching optical connector (86) for terminating the optical fiber (78) drawn from each of the housed optical branch modules so as to be connectable to a drawing cord (88) drawn from the optical switch is provided. The optical branch module, wherein a connector holder (89) detachably clamped and held in a state of being connected to a drawer cord is housed in the internal partition plate so as to be drawn out between the internal partition plate and the partition plate. An optical wiring rack which is attached to an end on the front side, which is a side from which the optical cable is drawn. An optical branch module (60) for branching and connecting a multi-core optical fiber (54) to an optical fiber core (55) by an optical connector connection,
A main body (72) for housing an optical coupler (77) interposed in the middle of an optical fiber (76) having one end connected to the multi-core optical fiber and the other end connected to the optical fiber core;
At one end of the main body, a connection optical connector (65) for connecting the optical fiber and the optical fiber core wire is attached,
An optical fiber that is switchably connected to the subscriber side multi-core optical fiber via a switching optical connector (85) at a position separated from the main body from the other end of the main body facing the connection optical connector; An optical fiber (78), which is connected to a pull-out cord (88) wired from an optical switch (62) by a switching optical connector (86), and is open at the other end surface of the main body. An optical branch module, wherein the optical branch module is drawn out of the main body from outlets (81, 82).

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