JP3640579B2 - Optical module - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an optical module for use in an optical wiring board or the like for switching a plurality of cable-side optical fibers on the optical cable side with an optical fiber terminated with an optical connector.
[0002]
[Prior art]
FIGS. 12 and 13 show an optical wiring board using an example of a conventional optical module. The optical wiring board shown here has a plurality of termination portions 102 provided in multiple stages in a frame 101. A plurality of optical modules 103 are housed side by side in a vertically placed state in the termination portion 102.
The optical module 103 includes a module main body 2 in the form of a thin plate case and an optical connector adapter 103 a provided at one end of the main body 2. The main body 2 has a lid 9, and an optical fiber inlet 6 is formed at the other end of the main body 2.
In the optical module 103, one end of the optical fiber 5 built in the module main body 2 in advance is terminated so as to be connectable to the connector by the optical connector 4, and the other end is branched into a single core and connected to the optical connector adapter 103a. .
[0003]
The cable-side optical fiber 28 drawn from the end of the optical cable 26 drawn into the optical wiring board is drawn into the optical module 103 in the termination portion 102 through the optical fiber inlet 6.
The optical fiber 28 introduced into the module main body 2 is connected to the optical fiber 5 by the optical connector 7a, so that the optical fiber 28 is terminated by the optical connector adapter 103a via the optical fiber 5. The The extra length of the cable-side optical fiber 28 is accommodated in the optical module 103 in a curved manner. On the other hand, the optical fiber (optical cord) 29 drawn from the terminal of the optical cable 25 (code cable) on the transmission device side is drawn into the target termination portion 102 and can be switched to the optical connector adapter 103a of the target optical module 103. Connected.
As a result, the cable-side optical fiber 28 and the switching optical fiber 29 are optically connected via the optical fiber 5.
[0004]
In the optical module 103, the optical fiber connection work and the extra length storage work are performed by removing the switching optical fiber 29 from the optical connector adapter 103a as necessary, and then moving the optical module 103 to the rear side as indicated by an arrow in FIG. Then, the optical module 103 is opened after being pulled out from the termination portion 102. After completion of the work, the optical module 103 is returned into the termination portion 102.
[0005]
[Problems to be solved by the invention]
However, in the optical module used for the optical wiring board, when the optical module is taken out from the termination for work such as the optical fiber connection work or when it is stored in the termination after the work is completed, the adjacent optical module is used. May have a mechanical effect such as vibration, which may adversely affect the optical line.
The present invention has been made in view of the above circumstances, and an object thereof is to provide an optical module capable of preventing an optical line from being adversely affected during work such as optical fiber connection work.
[0006]
[Means for Solving the Problems]
In the present invention, the following configuration is adopted in order to solve the above problems.
The optical module of the present invention includes a case-shaped module main body for storing an optical fiber, an optical connector provided on a side portion of the module main body for terminating the optical fiber in the module main body so that the connector can be connected, and the optical module. An extra-length storage case for storing the extra length of the fiber, and the extra-length storage case is connected to the module body via the rotary connecting portion, and the rotary connecting portion is maintained while maintaining the connection state by the rotary connecting portion. It can be pulled out and stored with respect to the module main body by rotation around the center, and the module main body includes a base portion on which the extra length storage case is placed, This base part can be wired so that the optical fiber in the module main body reaches the extra length storage case via the inside of the base part. It is characterized by that.
In the optical module, it is possible to perform an optical fiber connection operation and an extra length storage operation in an extra length storage case pulled out from the module main body without moving the module main body provided with the optical connector.
As described above, since the above operation can be performed without involving the module main body, vibration and impact are applied to the optical fiber and the optical component connected to the optical connector provided in the module main body at the time of the above operation. Can be prevented.
Furthermore, since the extra-length storage case is pulled out and stored while maintaining the connected state with respect to the module body, the extra-length storage case can be easily and accurately positioned during the drawer and storage.
For this reason, the vibration etc. which arise at the time of case drawer | drawing-out and storage work can be suppressed to the minimum, and it can suppress as much as possible that a vibration etc. are transmitted to another optical module at the time of the said operation | work.
In addition, since the module main body includes a base portion on which the extra length storage case is placed, a rotation connecting portion is provided at the rear end portion of the base portion, so that the extra length storage case can be rotated when being pulled out / stored. The center can be provided at a position greatly separated from the optical connector.
For this reason, it is possible to suppress the vibration transmitted from the rotary connecting portion to the module main body from reaching the optical connector as much as possible when the extra length storage case is pulled out / stored.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
The optical wiring board 20 using the optical module of one embodiment of the present invention will be described below with reference to FIGS.
In FIG. 8, the optical wiring board 20 has a configuration in which a plurality of termination units 21 are stacked in multiple stages (in this embodiment, five stages).
[0010]
FIGS. 9A and 9B are diagrams showing the termination unit 21, where FIG. 9A is a plan view, FIG. 9B is a front view, and FIG. 9C is a side view showing a storage state of the optical module 31 (adapter module).
As shown in this figure, each termination unit 21 includes a frame-shaped frame 22, a cable fixing portion 27 for fixing an optical cable 26 drawn into the frame 22, and a cable side drawn from the end of the optical cable 26. The optical fiber 28 includes an optical module 31, 32, and 33 that can be connected to the switch optical fiber 29 so that a connector can be connected thereto. Each termination unit 21 is connected to an optical pulse tester 23 (line monitoring device, see FIG. 8) provided at the lower part of the optical wiring board 20 via a monitoring connection portion 24 connected via an optical fiber 23a. An optical fiber selection device (optical switch; hereinafter referred to as “optical fiber selection device 24”) is also mounted.
[0011]
As shown in FIGS. 9B and 9C, the frame 22 is provided with an attachment 22a for positioning and fixing the lower termination unit 21 with respect to the frame 22, so that the lamination is performed. The upper and lower termination units 21 are stably connected without causing a positional shift. Fixation between the attachment 22a of the upper termination unit 21 and the frame 22 of the lower termination unit 21 is performed by a simple fixing means such as a bolt. Further, as shown in FIG. 8 (a), the line monitoring device which is the optical pulse tester 23 is also configured as a unitized line monitoring unit 23c in which various configurations are housed in a frame-like frame 23b. The attachment 22a of the lowermost termination unit 21 is positioned and fixed on the frame 23b of the line monitoring unit 23c. An optical fiber selection device 24 of each termination unit 21 is selectively connected to the optical pulse tester 23 via an optical fiber 23a. The line monitoring unit 23c may be provided with an optical fiber selection device that selects the optical fiber 23a.
The line monitoring unit 23c can be stacked in the same manner as the termination unit 21, and the installation position is not limited to the lower part of the optical wiring board 20, but the optical wiring board 20 upper part or termination units stacked in multiple stages. It may be between 21.
[0012]
The optical cable 26 drawn into each termination unit 21 constituting the optical wiring board 20 is introduced from a cable introduction unit 34 provided at the lowest or uppermost stage (lowermost stage in FIG. 8), and reaches the target termination unit 21. Be drawn. The cable introduction units 34a and 23d (cable introduction spaces) through which the optical cable 26 can be routed are provided at the sides of each termination unit 21 and the side of the line monitoring unit 23c. When the termination unit 21 and the line monitoring unit 23c exist between the terminal unit 21 and the target termination unit 21, the cable introduction units 21a and 23d are routed so that the cable is drawn into the target termination unit 21. Do. Each of the stacked termination units 21 and the cable introduction units 21a and 23d of the line monitoring unit 23c are communicated with each other. In FIG. 8A, the cable introduction unit 34 at the lower end of the optical distribution board 20 is connected to the bridge at the upper end of the optical distribution board 20. Since it continues until it reaches the intermediate wiring unit 50, the optical cable 26 can be efficiently drawn into the target termination unit 21 by using these continuous cable introduction portions 21a and 23d. The inter-mounting wiring unit 50 receives an optical fiber wired so as to pass between optical wiring boards and the like. The optical fiber 50a drawn into the optical wiring board 20 from the inter-interconnect wiring unit 50 can be either a cable-side optical fiber or a terminated optical fiber.
Note that in the cable introduction unit 34, the optical cables 25 and 26 are fixed to the support members 34a (see FIG. 8B) using a fixture such as a tying tool, so that the cable introduction unit 34 is led out to the ends of the optical cables 25 and 26. No external force such as tensile force acts on the optical fibers 28 and 29.
[0013]
The optical cable 26 drawn into the termination unit 21 is fixed by the cable fixing portion 27, and the cable side optical fiber 28 is drawn from the terminal.
The cable fixing unit 27 includes a gripping mechanism that grips and fixes the outer side of the outer periphery of the optical cable 26, a binding tool 27a that fixes the frame 22 with a binding force, and a tension member 26a exposed to the end of the optical cable 26. It consists of a tension member clamp 27b to be fixed. The cable fixing portion 27 may be attached to the frame 22 in advance or may be retrofitted together with the installation of the termination unit 21 at a predetermined position.
[0014]
As the cable-side optical fiber 28, an optical fiber core such as a single-core or multi-core optical fiber tape is usually used. For example, an optical cord drawn out from a cord cable terminal can also be used. In the present embodiment, a multi-core optical fiber ribbon with four cores, eight cores, etc. is illustrated.
On the other hand, the optical fiber 29 is an optical cord terminated at the tip so that the connector can be connected by an optical connector 29a (optical connector plug), and is drawn out to the end of the optical cable 25 such as a cord cable drawn from the cable introduction unit 32. An optical cord, an optical cord drawn directly from the cable introduction unit 32, an optical fiber core wire led out to an optical cable terminal, or the like that is covered with a tube is used.
As the optical connector 29a at the tip of the optical fiber 29, for example, an SC type optical connector (Single fiber Coupling optical fiber connector) established in JIS C 5973, an SC2 type optical connector, and an MU type optical connector established in JIS C 5983 ( An optical connector plug such as a Miniature-Unit couplimg optical fiber connector) is employed.
As the optical connector adapters 311, 321, and 331 (described later) attached to the side portions of the optical modules 31, 32, and 33, those that can connect the optical connector 29 a of the optical fiber 29 are employed.
Note that it is considered advantageous to adopt the SC2 type optical connector in terms of improvement in mounting density due to miniaturization, switching connection workability, and the like.
[0015]
As shown in FIGS. 9A, 9B, and 9C, the cable side optical fiber 28 is connected to the front side of the termination unit 21 from the cable fixing portion 27 (lower side in FIG. 9A, FIG. 9B). The surplus facing the cable introduction part 21a via the module housing part 30 via the optical fiber wiring part 21c (wiring space) on the rear side of the termination unit 21 facing the front side of the drawing, the left side of FIG. It is drawn into the long absorption part 21d (wiring space), and further drawn out from the front side of the termination unit 21 to the rear side of the termination unit 21 via the lower side of the module storage part 30, and from there into the module storage part 30 The optical modules 31, 32, and 33 stored therein are drawn into the target one. In the optical modules 31, 32, and 33, the cable-side optical fiber 28 is terminated by the optical connectors 311, 321, and 331 so that the connectors can be connected by connecting the optical fibers inside.
[0016]
The module storage section 30 can be pulled out from the frame 22 to the front side by horizontal rotation around the hinge 35 provided in the surplus length absorption section 21d with the optical modules 31, 32, 33 mounted on the module base 30a. (The imaginary line in FIG. 9A). The module storage unit 30 is unitized including the optical fiber selection device 24, and the optical fiber selection device 24 is also rotated by the rotation of the module storage unit 30.
The module storage unit 30 is provided with a lock piece 30b. When the module storage unit 30 is pushed into the frame 22, the lock piece 30b on the module storage unit 30 side is moved to the catch mechanism 22b on the frame 22 side (FIG. 9). (See (c)), the module storage unit 30 is prevented from inconveniences such as inadvertently popping out of the frame 22 unless the drawer operation is forcibly performed.
[0017]
The cable-side optical fiber 28 is routed from the surplus length absorbing portion 21d to the lower side of the module storage unit 30 (lower side of the module base 30a) through the vicinity of the hinge 35. Movement due to rotation is reduced, and it is possible to always ensure a stable curvature radius (R30 or more) that does not affect the optical characteristics. Note that the cable-side optical fiber 28 is less likely to be abruptly bent due to the tube coating from the end of the optical cable 26 to the lower side of the cable housing 30. Further, on the back side of the termination unit 21, the cable side optical fiber 28 is fastened by a clip 22c fixed to the frame 22. Therefore, even if the module housing portion 30 is pulled out, the portion fastened by the clip 22c cannot be moved. First, when the module storage unit 30 is returned into the frame 22, the cable-side optical fiber 28 is appropriately bent and returns to the curved wiring state before the module storage unit 30 is pulled out, so that sudden bending or the like does not occur.
[0018]
On the other hand, the optical fiber 29 is also substantially horizontal from the surplus length absorbing portion 21d to the front side of the module housing portion 30 (front in the pulling direction from the tip unit 21) via the cord clamp 21e provided near the hinge 35. The cord duct 21f provided in a bowl shape is introduced, and the vicinity of the hinge 35 is wired from the cord clamp 21e to the cord duct 21f. There is little movement due to rotation, and a radius of curvature exceeding a specified value can be stably maintained. Further, by being detachably clamped by the cord clamp 21e, it is possible to prevent the module storage unit 30 from following the rotational movement.
In the surplus length absorbing portion 21d, a large number of optical fibers 29 are arranged and wired by using frame-shaped code guides 21g and 21h fixed to the frame 22. Further, the extra length of the optical fiber 29 is absorbed by bending the optical fiber 29 by the bending member 21i as shown in FIGS. 8C, 9A, and 9B.
[0019]
In the module storage unit 30, optical modules 31, 32, and 33 formed in a thin case shape are arranged and stored in a row in a vertical arrangement. The optical modules 31, 32, and 33 are placed on the module base 30a and positioned by guide portions (not shown) on the module base 30a. Each optical module 31, 32, 33 is inserted into the module storage unit 30 from the back side of the module storage unit 30 exposed by being pulled out to the front side of the termination unit 21, that is, along the guide unit of the module base 30a. Inserted and stored. Then, when the module body portion of the inserted optical module 31, 32, 33 hits the terminal plate 30c fixed to the front surface side of the module storage unit 30, the optical module 31, 32, 33 protrudes from the side of the optical module 31, 32, 33. The optical connector adapters 311, 321, and 331 are positioned on the connector array portion 21 b that is an area along the terminal plate 30 c. The optical modules 31, 32, and 33 stored in the module storage unit 30 can be taken out by being pulled out to the back side of the termination unit 21.
Terminating the optical fiber adapters 31, 321, 331 of the optical modules 31, 32, 33 so that the cable side optical fiber 28 can be connected to the connector is performed by opening the optical modules 31, 32, 33 outside the termination unit 21. Optical connectors 31, 321, 321, 321, 321, terminated so that the cable side optical fiber 28 can be connected to the connector are accommodated by housing the optical modules 31, 32, 33 that have been completed in the module housing 30. 331 is positioned on the connector array portion 21b.
[0020]
The multiple optical connector adapters 311, 321, and 331 arranged in the connector arrangement unit 21 b are switchably connected to the optical fiber 29 drawn to the front side of the module storage unit 30. As shown in FIGS. 9A, 9B, and 9C, the optical fiber 29 is pulled upward at an appropriate position from the cord duct 21f, and the optical connector adapter 311 of the target optical modules 31, 32, and 33. , 321, 331. The optical fiber 29 pulled up from the cord duct 21f is detachably held by the cord support 30d protruding from the vicinity of the terminal plate 30c to the front surface side of the module storage unit 30 so that a plurality of optical fibers 29 in units of the optical modules 31, 32, and 33 are provided. Therefore, a large number of optical fibers 29 are arranged and wired in units of optical modules 31, 32, and 33 on the front side of the module storage unit 30.
[0021]
Of the optical modules 31, 32, 33, the optical module 32 houses an optical coupler 32a, and the optical module 33 houses an optical splitter 33a.
Hereinafter, the optical module 31 will be described as the adapter module 31, the optical module 32 as the coupler module 32, and the optical module 33 as the splitter module 33.
10 and 11 are optical wiring diagrams showing the optical wiring in the optical wiring board 20. FIG. 10 shows the case where the cable side optical fiber 28 is not terminated so that the connector can be connected, and FIG. 28 shows a case where the tip of the cable 28 is terminated by an optical connector 28a so that the connector can be connected (in this case, the optical cable 26 is a so-called optical cable with a connector).
[0022]
First, the case where the tip of the cable-side optical fiber 28 is not terminated so as to be connectable to a connector will be mainly described with reference to FIG.
In FIG. 10, the optical fiber 29 connected to the optical connector adapters 311, 321, and 331 of each of the optical modules 31, 32, and 33 is an optical fiber on the transmission device 51 side (hereinafter “device-side optical fiber”. Cord) and an optical fiber that is a jumper cord between the optical connector adapters 311, 321, and 331, and these optical fibers are given different reference numerals 291 and 292 for the sake of convenience of explanation.
[0023]
As shown in FIGS. 9C and 10, the cable-side optical fiber 28 drawn into the adapter module 31 is connected to the optical fiber 31 a built in the adapter module 31 and the extra length is stored in a curved manner. One end of the optical fiber 31a connected to the cable-side optical fiber 28 is a multi-core optical fiber having the same number of cores as the cable-side optical fiber 28, but the other end branched in a single core via the branch portion 31b is The optical connector adapter 311 is connected. As a result, the cable side optical fiber 28 is terminated by the optical connector adapter 311 via the optical fiber 31a so as to be connectable to the switching optical fibers 291 and 292.
In FIG. 10, the cable side optical fiber 28 and the optical fiber 31a are connected via a fusion splicing portion 28b. Further, since the tip of the optical fiber 31a branched from the single core is terminated so that the connector can be connected by the optical connector 31c, the connection to the optical connector adapter 311 is simple and can be switched. The optical connector adapter 311 can be selected.
[0024]
As shown in FIG. 10, in the coupler module 32, the optical fiber 28c connected to the cable side optical fiber 28 via the fusion splicing portion 28b is drawn, and the optical fiber terminated so that the connector can be connected by the optical connector 28d. The tip of 28c is connected to an optical fiber 32b (optical connector 32c) built in the coupler module 32. The fusion splicing part 28b between the optical fibers 28 and 28c is accommodated in the fusion module 37 accommodated in the module accommodating part 30 separately from the adapter module 31 or the optical modules 31, 32 and 33 together with the extra length. That is, in any case, the optical fiber 32b on the coupler module 32 side is switchably connected via the optical fiber 28c connected by the fusion module 37 or the adapter module 31. It has come to be. The cable-side optical fiber 28 is split into a single core via an optical fiber 32b with a built-in coupler module 32 and connected to the optical connector adapter 321, so that the optical connector adapter 321 can be connected to the switching optical fibers 291 and 292 with a connector. Ended.
[0025]
The optical fiber 32d branched by the optical coupler 32a disposed in the middle of the optical fiber 32b built in the coupler module 32 is connected to the optical fiber selector 24, and the optical fiber selector 24 uses the optical pulse tester. By connecting the optical fiber 23a on the 23 side and the optical fiber 32d, the optical line on the cable side optical fiber 28 side from the optical pulse tester 23 through the optical coupler 32a and the light from the front side of the termination unit 21 are connected. The test light can enter the optical fiber on the optical fiber 291, 292 side connected to the connector adapter 321. The optical pulse tester 23 monitors disconnection and the like of each optical line from the observation result of the return light made incident on the optical line with test light such as an optical pulse of a predetermined wavelength (line monitoring). Noise light is cut by the optical filter 32f disposed between the optical connector 32e at the front end of the optical fiber 32b built in the coupler module 32 that is switchably connected to the optical connector adapter 321 and the optical coupler 32a. Therefore, it is possible to improve the accuracy of the return light observation in the optical pulse tester 23.
[0026]
From the optical coupler 32a, an optical fiber 32d is drawn out corresponding to each of the optical line on the cable side optical fiber 28 side and the optical line on the optical fiber 291 and 292 side, and each optical fiber 32d is connected to the optical connector 32g. Are connected to each other by a plurality of connection terminals on the optical fiber selection device 24 side, so that the optical fiber selection device 24 is connected to the optical pulse tester 23 side. By switching the connection of the optical fiber 23a to the optical fiber 32d, the test light can be individually incident on the target optical line, and the line can be monitored.
[0027]
In the optical coupler 32a, the optical fiber 32b from the optical coupler 32a to the optical connector 32c is a multi-core optical fiber (for example, a 4-core optical fiber ribbon) having the same number of cores as the cable-side optical fiber 28. For example, one corresponding to multi-core such as 8chWINC is adopted, and each optical fiber 32d drawn from the optical coupler 32a is also a multi-core optical fiber having the same number of cores as the cable-side optical fiber 28. In the optical fiber selection device 24, the optical fiber 23a on the optical pulse tester 23 side is switched and connected in units of a single core to a plurality of optical lines on the optical fiber 32d side.
[0028]
Also in the splitter module 33, the optical fiber 33b drawn from the fusion module 37 or the adapter module 31 is connected to the built-in optical fiber 33b, so that the cable-side optical fiber 28 is optically connected to the optical fiber 33b on the splitter module 33 side. They are connected via a fiber 28c. Between the optical fibers 33b and 28c, the connector of the optical fiber 28c (optical connector 28d) is connected to the tip of the optical fiber 33b that can be connected to the connector by the optical connector 33c. It is.
[0029]
The optical fiber 33b on the splitter module 33 side is a multi-core optical fiber having the same number of cores as the cable-side optical fiber 28, but the optical fiber 33d connected to the optical connector adapter 331 is branched by the optical splitter 33a. When the cable-side optical fiber 28 is connected to each optical fiber 33b, a plurality of cable-side optical fibers 28 are branched and connected to the optical fibers 291 and 292 connected to the optical connector adapter 331, thereby forming a PDS line. Since the optical fiber 33b can be switched and connected to the optical connector adapter 331 by the optical connector 33g at the tip, the optical connector adapter 331 to be connected can be selected.
[0030]
From the middle of each optical fiber 33b, optical fibers 33i corresponding to the optical lines related to the cable-side optical fiber 28 and the optical lines related to the optical fibers 291 and 292 connected to the optical connector adapter 331, The light is branched through the optical coupler 33e and connected to the optical fiber selection device 24. The optical fiber 33 i is a multi-core optical fiber having the same number of cores as the cable-side optical fiber 28. In FIG. 10, the optical fiber 33i is also terminated with an optical connector 33h so that it can be connected to the connector similarly to the optical fiber 32d drawn from the coupler module 32. Therefore, the optical fiber 33i can be easily connected to the connection terminal of the optical fiber selector 24. It can be switched and connected. When the optical fiber 33i is connected to the optical fiber selection device 24, the optical lines of the cable-side optical fiber 28 and the optical fibers 291 and 292 related to the optical fiber 33i can be monitored line by line.
[0031]
In the optical fiber selection device 24, the optical fiber 23a on the optical pulse tester 23 side is switched in units of single fibers for each optical path of the multi-fibers 32d and 33i drawn out from the coupler module 32 and the splitter module 33. Connecting. The switching connection and the incidence of the test light from the optical pulse tester 23 are sequentially and continuously performed for a large number of optical lines connected to the optical fiber selection device 24, and are repeatedly performed. The constant monitoring of the optical line connected to the optical fiber selector 24 is realized.
Since the noise light is cut by the optical filter 33f disposed in the middle of the optical fiber 33d of the splitter module 33, the return light observation by the optical pulse tester 23 can be performed with high accuracy.
[0032]
If the connection terminals of the optical fiber selection device 24 are arranged so as to be connectable to the optical connector 28d at the tip of the optical fiber 28c, the cable-side optical fiber 28 before being drawn into the optical modules 31, 32, 33 is directly connected to the optical fiber selection device. It is also possible to monitor the line by connecting to the cable 24, so that the disconnection of the optical line related to the cable side optical fiber 28 can be efficiently detected in advance before the completion of the optical wiring board 20.
[0033]
When the cable side optical fiber 28 is terminated by the optical connector 28a so that the connector can be connected, the optical fiber 31a, 32b, 33b of the adapter module 31, the coupler module 32, and the splitter module 33 are connected as shown in FIG. On the other hand, a direct connector connection is possible. However, in FIG. 10, the optical fiber 31 a that is not provided with an optical connector is housed in the adapter module 31 at the end of the optical fiber 31 a that is connected to the cable-side optical fiber 28. Is directly connected, an optical fiber 31a having an optical connector 31d (see FIG. 11) at the tip is employed. In addition, in the adapter module 31, a connection form in which the optical fiber 28, 31a is connected to the optical fiber 31a with the optical connector 31d by connecting the optical fiber 28c connected to the cable side optical fiber 28 is also adopted. It is possible to secure connection workability and switching connectivity.
[0034]
The optical connector 28a at the tip of the cable-side optical fiber 28 drawn from the optical cable with connector, the optical connector 28d at the tip of the optical fiber 28c to be spliced to the cable-side optical fiber 28, and the built-in optical modules 31, 32, 33 are provided. Optical connectors 31d, 32c, 33c at the tips of the optical fibers 31a, 32b, 33b, and optical connectors 32g, 33h at the tips of the optical fibers 32d, 33i connected from the optical modules 32, 33 to the optical fiber selector 24 are JIS C 5981. The so-called MT type optical connector (Mecanically Transferable) established by Further, as described above, in order to enable the direct connection of the cable side optical fiber 28 or the optical fiber 28c to the optical fiber selection device 24, the number of the corresponding optical connectors listed is set to, for example, 4 or 8 cores. It is preferable to make them all the same as in the above, and thereby the workability of the switching connection can be improved. However, it is also possible to adopt an optical connector with a special configuration, such as one in which two 4-fiber MT optical connectors can be connected to an 8-fiber MT optical connector. It is not necessary to have the same number of connectors.
[0035]
In the configuration in which the cable side optical fiber 28 terminated by the optical connector 28a is directly connected to the optical fibers 32b and 33b of the coupler module 32 and the splitter module 33, the optical fiber 28c shown in FIG. The fusion splicing part 28b between the optical fiber 28c and the cable side optical fiber 28 is not necessary. Further, the cable-side optical fiber 28 does not need to be routed through the adapter module 31 or the fusion module 37 in order to store the fusion splicing portion 28b or the connection surplus length. By reducing the connection loss, the connection loss can be kept low. Thereby, since the fusion module 37 can be omitted, the cost can be reduced and the storage density of the optical modules 31, 32, and 33 can be improved.
If the optical connector 28a of the cable-side optical fiber 28 is matched with the optical connector 28d of the optical fiber tip 28c shown in FIG. 10, the cable-side optical fiber 28 also monitors the line by direct connection to the optical fiber selection device 24. It is possible.
[0036]
Thus, in the termination unit 21, the cable-side optical fiber 28 drawn into the module housing unit 30 is connected to the optical fibers 291, 292 by the optical connector adapters 311, 321, 331 of any of the optical modules 31, 32, 33. The connector can be terminated to be connectable. As shown in FIG. 9A, the optical connector adapters 311, 321, 331 of the optical modules 31, 32, 33 are arranged in the connector arrangement part 21 b of the termination unit 21. The switching connection of the optical fibers 291 and 292 to the cables 321 and 331 is also easy, so that the switching connection between the optical lines on the optical fibers 291 and 292 side and the optical path on the cable side optical fiber 28 side can be easily performed. Further, by selecting and using the adapter module 31, the coupler module 32, and the splitter module 33, it is possible to easily cope with selection and switching of the presence / absence of line monitoring and the presence / absence of branch connection by the optical splitter 33a. That is, an adapter module 31 is used for the cable-side optical fiber 28 that does not require line monitoring, and a coupler module 32 is used for the cable-side optical fiber 28 that requires line monitoring. A splitter module 33 is employed for the optical fiber 28. Thereby, termination by the optical connector, line monitoring, PDS line formation, etc. can be performed from the lead-out of the cable side optical fiber 28 from the optical cable 26 in units of the termination unit 21.
[0037]
As shown in FIGS. 10 and 11, the optical fibers 291 and 292 are connected to the target optical connector adapters 311, 321 and 331 of the optical modules 31, 32 and 33 selected as appropriate, but the device-side optical fiber 291 is connected. Then, the optical line on the cable side optical fiber 28 side is connected to the transmission device 51.
In the adapter module 31 and the coupler module 32, the optical line of the device-side optical fiber 291 and the optical line of the cable-side optical fiber 28 are connected on a one-to-one basis. Thus, a plurality of optical lines on the cable side optical fiber 28 side are branched and connected.
[0038]
Further, when the optical connector adapters 311 of the adapter module 28 are connected by an optical fiber 292 that is a jumper cord, the cable side optical fibers 28 can be connected. Since both ends of the optical fiber 292 are terminated to be connectable to the optical connector adapter 311 by optical connectors 292a, one end or both ends of the optical fiber 292 are connected to the optical connector adapter 311 of each adapter module 28. By switching the connection, the connection between the cable side optical fibers 28 can be easily switched.
8 and 9A, 9B, and 9C, the optical fiber 292 is also wired on the front side of the optical wiring board 20 in the same manner as the optical fiber 291, and each termination unit is It is wired between the target termination units 21 using the extra length absorbing portion 21d on the 21 side. For this reason, it is not necessary to secure a space for switching the jumper of the optical fiber 292 separately.
[0039]
Once the assembled unit 21 is completed, the optical modules 31, 32, and 33 used for terminating the cable-side optical fiber 28 can be changed, and it can easily cope with the presence / absence of line monitoring and the presence / absence of PDS. There are advantages you can do. For example, in FIG. 10, in order to change the cable side optical fiber 28 initially terminated in the adapter module 31 to a line for monitoring a line or a PDS line, the cable side optical fiber 28 is replaced with the optical modules 32 and 33. (When terminated with the optical connector 28a) Or the optical fiber 28c connected to the cable side optical fiber 28 is replaced with the optical module 32, 33, and the optical fiber 28, 28c is replaced with the optical module 32. , 33 may be connected to the optical fibers 32b and 33b on the 33 side.
The number of optical modules 31, 32, and 33 stored in the module storage unit 30 can be freely changed, and one or two types of optical modules 31, 32, and 33 may not be stored. As described above, in the configuration in which the number of the optical modules 31, 32, and 33 can be freely changed, when the number of the optical modules 31, 32, and 33 is fixed, the line monitoring dedicated unit, and the branch connection dedicated There is an advantage that waste is less likely to occur compared to the case of using a unit.
[0040]
The line monitoring optical fibers 32d and 33i drawn from the coupler module 32 and the splitter module 33 are connected to the optical fiber selection device 24 in the termination unit 21 in which the coupler module 32 and the splitter module 33 are housed. The track monitoring can be easily realized. In FIG. 9A, the coupler module 32 and the splitter module 33 may be connected to a connection terminal (not shown) of the optical fiber selection device 24 above the module storage unit 30. When the coupler module 32 or the splitter module 33 is moved or removed, the connection can be easily released simply by removing the optical fibers 32d and 33i from the connection terminals of the optical fiber selection device 24. Is possible.
[0041]
Next, the structure of the three types of optical modules 31, 32, and 33 and the arrangement of the optical fibers and optical components in the optical module when the optical fibers are wired as shown in FIG. 10 will be described in detail.
[0042]
As shown in FIGS. 1 and 2, the adapter optical module 31 includes a thin plate case-shaped module main body 62 and a thin plate case-shaped extra length storage case 63 that stores the extra length of the cable-side optical fiber 28.
The module main body 62 is substantially L-shaped with a base portion 62a on which the extra-length storage case 63 is placed and an optical connector holding portion 62b extending substantially perpendicularly to the base portion 62a from the end portion of the base portion 62a. Is formed.
The extra length storage case 63 is formed in a substantially rectangular shape along the inner edge shape of the module main body 62 (the upper edge of the base portion 62a and the rear edge of the holding portion 62b). The surplus length storage case 63 includes a tray-shaped surplus length storage case main body 63a and a lid portion 63c hinged to the main body 63a at a thin portion 63b formed at the rear edge of the main body 63a.
[0043]
In the extra-length storage case 63, two cylindrical guide walls 63d are formed, and an optical fiber is wound around the guide walls 63d to secure a curvature radius that does not affect the optical characteristics of the optical fiber. It can be stored in. The extra length storage case 63 is connected to the rear end portion of the base portion 62 a of the module main body 62 via the rotation connecting portion 64.
[0044]
The rotary connecting portion 64 is a universal joint portion having a curved rod-like connecting member 64a that connects the base portion 62a of the module main body 62 and the extra length storage case 63, and the base end of the connecting member 64a is located behind the base portion 62a. It is connected to a hinge 64b provided at the end, and the tip is connected to the lower end of the extra length storage case 63 at a rotation support part 64c.
The connecting member 64 a can be rotated in a plane parallel to the module main body 62 at the hinge 64 b, and the extra length storage case 63 can be rotated in a plane parallel to the module main body 62.
Further, the connecting member 64a can rotate the extra-length storage case 63 in the rotation support portion 64c with the distal direction (vertical direction in the illustrated example) 64d of the connecting member 64a as a rotation axis.
[0045]
For this reason, the surplus length storage case 63 has a fulcrum as shown by a two-dot chain line from a position located on the base 62a as shown by a solid line in FIGS. 1 (c) and 2 (b). As shown in FIG. 1 (b) (two-dot chain line) and FIG. 7, in the rear pulled state, the rotary connecting portion 64 is substantially used as a fulcrum. It can be set in a state of being tilted horizontally.
[0046]
Next, optical wiring in the optical module 31 will be described with reference to FIG. 10 in addition to FIGS.
As shown in FIG. 1C, the cable side optical fiber 28 is first introduced into the extra length storage case 63, and the extra length is wound around the guide wall 63d. The optical fiber 31a connected to the cable side optical fiber 28 via the fusion splicing portion 28b is drawn out of the extra length storage case 63 via the guide wall 63d, and passes through the vicinity of the rotary connecting portion 64 to the inside of the module main body 62. Has been introduced. In the module main body 62, the optical fiber 31a is single-branched at the branch portion 31b and connected to the optical connector adapter 311 by a connector. Note that the fusion splicing portion 28 b is installed in a holder 63 f formed in the extra length storage case 63.
[0047]
Next, the structure of the coupler module 32 will be described.
As shown in FIGS. 3 and 4, the coupler module 32 includes a thin plate case-shaped module main body 72 and a thin plate case-shaped extra length storage case 73 that stores the extra length of the cable-side optical fiber 28.
The module main body 72 is formed in a substantially L shape including a base portion 72a on which the extra-length storage case 73 is placed and an optical connector holding portion 72b erected from the base portion 72a.
The extra length storage case 73 is formed in a substantially rectangular shape along the inner edge shape of the module main body 72. The extra length storage case 73 includes a tray-like extra length storage case main body 73a and a lid portion 73c hinged to the main body 73a at a thin portion 73b formed at the rear edge of the main body 73a.
[0048]
The extra length storage case 73 is divided into a first storage chamber 75 and a second storage chamber 76 by a partition wall 74 along the side surface of the case. The partition wall 74 is provided with an optical fiber introduction port 74 a that guides the optical fiber from the first storage chamber 75 into the second storage chamber 76.
In the first and second storage chambers 75 and 76, guide walls 75d and 76d for storing the optical fiber in a curved manner are formed, respectively.
The extra length storage case 73 is connected to the rear end portion of the base portion 72 a of the module main body 72 via the rotation connecting portion 77.
[0049]
The rotation connecting portion 77 has the same configuration as the rotation connecting portion 64 in the optical module 31, and the extra length storage case 73 is rotated in a plane parallel to the module main body 72 by the connecting member 77 a. Further, rotation about the tip direction of the connecting member 77a is possible.
For this reason, the surplus length storage case 73 has a fulcrum as a fulcrum as shown by a two-dot chain line from a position located on the base 72a as shown by a solid line in FIGS. 3 (c) and 4 (b). As shown by a two-dot chain line in FIG. 3 (b), the rotary connecting portion 77 is tilted almost horizontally as a fulcrum. It can be in a state.
[0050]
Next, optical wiring in the coupler module 32 will be described with reference to FIGS.
As shown in FIG. 3C, the optical fiber 28c is first introduced into the first storage chamber 75 of the extra length storage case 73, and the extra length is wound around the guide wall 75d. The optical fiber 32b having the optical connector 32c connected to the optical connector 28d at the tip of the optical fiber 28c is introduced into the second storage chamber 76 through the optical fiber introduction port 74a through the guide wall 75d. The optical connector 28d and the optical connector 32c are installed in a holder 75f in the first storage chamber 75.
[0051]
As shown in FIG. 4B, the optical fiber 32 b introduced into the second storage chamber 76 is drawn out from the extra-length storage case 73 and is introduced into the module main body 72 through the vicinity of the rotary connecting portion 77. . The optical fiber 32b introduced into the module main body 72 is branched from a single core and is connected to the optical connector adapter 321 by an optical connector 32e.
The optical fiber 32d for line monitoring drawn out from the optical coupler 32a disposed in the optical fiber 32b is led out of the module main body 72 through an optical fiber outlet 72d formed on the front side of the module main body 72. Yes.
The optical connectors 28d and 32c are installed in a holder 75f provided in the second storage chamber 76. The optical coupler 32 a is installed in an optical component installation section 76 e provided in the second storage chamber 76.
[0052]
Next, the structure of the splitter module 33 will be described.
As shown in FIG. 5 and FIG. 6, the splitter module 33 includes a thin plate case-shaped module main body 82 and a thin plate case-shaped extra length storage case 81 that is stacked on the module main body 82. . The extra length storage case 81 is formed in a substantially square shape.
The extra length storage case 81 includes a tray-like extra length storage case main body 81a and a lid portion 81c hinged to the main body 81a in a thin portion 81b formed at the rear edge of the main body 81a.
A guide wall 81 d for bending and storing the optical fiber is provided in the extra length storage case 81.
The module main body 82 is formed in a substantially rectangular shape, and the front part thereof is an optical connector holding part 82 b that holds the optical connector adapter 331. Inside the module body 82, a guide wall 82d for storing the optical fiber in a curved manner is provided.
[0053]
The extra length storage case 81 is connected to the vicinity of the lower end of the rear end portion of the module main body 82 via the rotation connecting portion 83.
The rotation connecting portion 83 includes a connecting member 83 a that connects the module main body 82 and the extra length storage case 81, similarly to the rotation connecting portion 64 in the optical module 31. The base end of the connecting member 83a is connected to a hinge 83b provided in the vicinity of the lower end of the rear end of the module main body 82, and the tip is connected to the extra-length storage case 81 at the rotation support portion 83c.
The connecting member 83a allows the extra-length storage case 81 to rotate in a plane parallel to the module main body 82 and to rotate about the tip direction of the connecting member 83a.
For this reason, the extra-length storage case 81 has the rotational connection portion 83 as a fulcrum as shown by a two-dot chain line from a state where it is superimposed on the module main body 82 as shown by a solid line in FIGS. 5 (c) and 6 (b). As shown by the two-dot chain line in FIGS. 5A and 5B, the rotary connecting portion 83 is tilted almost horizontally as a fulcrum. It can be in a state.
[0054]
Next, optical wiring in the splitter module 33 will be described with reference to FIGS.
As shown in FIG. 5A, the optical fiber 28c is first introduced into the extra length storage case 81, and the extra length is wound around the guide wall 81d.
The optical fiber 33b having the optical connector 33c connected to the optical connector 28d at the tip of the optical fiber 28c is drawn out of the extra length storage case 81 through the guide wall 81d, and is introduced into the module main body 82 through the vicinity of the rotary connecting portion 83. ing.
[0055]
As shown in FIG. 6B, in the module main body 82, the optical fiber 33d connected to the optical fiber 33b via the optical splitter 33a is branched into a single core through the guide wall 82d, and is connected to the optical connector adapter 331. It is connected.
The line monitoring optical fiber 33i drawn from the optical coupler 33e disposed in the optical fiber 33b is led out of the module main body 82 through an optical fiber outlet 82d formed on the front side of the module main body 82. Yes.
The optical connectors 28d and 33c are installed in a holder 81f provided in the extra length storage case 81. The optical splitter 33a and the optical coupler 33e are installed in an optical component installation section 82f provided in the module main body 82.
[0056]
Next, an example of how to use the optical modules 31, 32, and 33 will be described.
When the optical module 31 is used, the extra length storage case 63 of the optical module 31 stored in the module storage unit 30 is rotated backward (in the direction of the arrow in the figure) with the rotation connecting unit 64 as a fulcrum, Pull out from the module body 62.
[0057]
Next, as shown in FIG. 7, the surplus length storage case 63 is brought into a state where the surplus length storage case 63 is tilted substantially horizontally, and the lid 63 c of the pulled out surplus length storage case 63 is opened to open the surplus length storage case 63.
As a result, the cable-side optical fiber 28 and the optical fiber 31a can be connected and the extra length can be accommodated while the inside of the extra length storage case 63 is exposed.
Further, the extra-length storage case 63 can be used as a work table for placing optical fibers, optical components, and the like to be connected during the above work.
After the work is completed, the extra length storage case 63 is stored on the base 62b of the module main body 62.
[0058]
When the coupler module 32 is used, as with the optical module 31, the excess length storage case 73 is pulled out from the module main body 72 to the rear, the extracted excess length storage case 73 is opened, and the inside of the excess length storage case 73 is exposed. Work.
[0059]
In order to use the splitter module 33, the extra length storage case 81 is pulled out backward, the extra length storage case 81 is opened, and the inside of the extra length storage case 81 is exposed.
[0060]
In the optical module 31, the extra-length storage case 63 can be pulled out with respect to the module main body 62 by the rotation of the rotation connecting portion 64. The optical fiber connection work and the extra length accommodation work can be performed in the extra length storage case 63 pulled out while remaining in the inside.
As described above, since the above operation can be performed without involving the module main body 62, vibration or impact is applied to the optical fiber or the optical component connected to the optical connector adapter 311 provided in the module main body 62 during the above operation. Can be prevented from being added.
Furthermore, since the extra length storage case 63 is connected to the module main body 62 only at one point (the hinge 64b at the base end of the connecting member 64a), the extra length storage case 63 is transmitted to the module main body 62 when the extra length storage case 63 is pulled out. Vibration can be minimized.
Accordingly, it is possible to prevent an adverse effect on the optical line in the optical wiring board during the above operation.
[0061]
Further, in the case of an optical module that can be pulled out as in the conventional example shown in FIGS. 12 and 13, an external optical fiber that is connected to an optical connector adapter provided in the optical module is also pulled together when being pulled out. In order to prevent the optical module 31 from being disconnected, it may be necessary to release the connection to the optical connector adapter at the tip of the optical fiber and to reconnect it at the time of storage. Since the connection work and the like can be performed without moving the connector adapter 311, it is not necessary to release or reconnect the optical fiber 29 to the optical connector adapter 311.
Therefore, the working efficiency can be improved and erroneous connection can be prevented.
[0062]
In the optical module 31, the extra length storage case 63 is pulled out / stored while maintaining the connected state with respect to the module main body 62, so that the extra length storage case 63 can be easily and accurately positioned during the extraction / storage.
Therefore, it is possible to prevent vibration and the like from occurring when the case is pulled out and stored. For this reason, it is possible to prevent adverse effects on the lines formed by the optical fibers in other optical modules. In addition, work efficiency can be improved.
[0063]
Further, in the case of an optical module that can be pulled out as in the conventional example, an accident in which the storage position is mistaken may occur when the optical module that has been pulled out is re-stored. Since it is connected to the module main body 62, an accident in which the case storage position is wrong cannot occur, and erroneous connection can be prevented in advance.
[0064]
Further, by introducing the optical fiber 31a drawn from the extra-length storage case 63 into the module main body 62 through the vicinity of the rotary connecting portion 64, the amount of movement of the optical fiber 31a when the case 63 is pulled out or stored is reduced. It is possible to always ensure a stable curvature radius (R30 or more) that does not affect the optical characteristics, and to prevent loss or breakage.
[0065]
Further, since the module main body 62 includes the base portion 62a on which the surplus length storage case 63 is placed in a state where the surplus length storage case 63 is stored, the rotation connecting portion 64 is provided at the rear end portion of the base portion 62a. As a result, the rotation center of the extra length storage case 63 when being pulled out / stored can be provided at a position that is largely separated from the optical connector adapter 311.
For this reason, when the extra length storage case 63 is pulled out / stored, the vibration transmitted from the rotary connecting portion 64 to the module main body 62 is prevented from reaching the optical connector adapter 311 as much as possible, and is connected to the optical connector adapter 311. The adverse effect on the optical fiber can be kept low.
[0066]
Further, the rotation connecting portion 64 allows rotation in a plane parallel to the module main body 62 of the extra length storage case 63 and rotation around the distal end direction of the connecting member 64a. As shown in FIG. 5, the extra-length storage case 63 can be brought into a state of being almost horizontally tilted when pulled out rearward.
Since the extra-length storage case 63 in a horizontally tilted state can be used as a work table for placing optical fibers and optical components to be connected, the optical fiber connection work and the extra-length storage work are facilitated. be able to.
[0067]
In the coupler module 32, as in the optical module 31, the optical fiber, the optical component, and the other optical module connected to the optical connector adapter 321 are subjected to vibration and shock when the extra length storage case 73 is pulled out / stored. Can be prevented as much as possible, and adverse effects on the line can be prevented.
[0068]
In the splitter module 33, as in the case of the optical module 31, the optical fiber, the optical component, and other optical modules connected to the optical connector adapter 331 are subjected to vibration and shock when the extra length storage case 81 is pulled out / stored. Can be prevented as much as possible, and adverse effects on the line can be prevented.
Furthermore, since the extra length storage case 81 is laminated on the module main body 82, the size (side area) of the extra length storage case 81 can be set large. For this reason, the extra storage capacity can be increased, and the number of corresponding cores can be increased.
[0069]
【The invention's effect】
As described above, in the optical module of the present invention, the extra-length storage case is connected to the module main body via the rotary connecting portion, and the rotary connecting portion is maintained at the center while maintaining the connection state by the rotary connecting portion. Since it can be pulled out and stored in the module body by rotation, the optical fiber connection work and the extra length can be stored in the extra length storage case pulled out from the module main body without moving the module main body provided with the optical connector. Work can be done.
As described above, since the above operation can be performed without involving the module main body, vibration and impact are applied to the optical fiber and the optical component connected to the optical connector provided in the module main body at the time of the above operation. Can be prevented.
Furthermore, since the extra-length storage case is pulled out and stored while maintaining the connected state with respect to the module body, the extra-length storage case can be easily and accurately positioned during the drawer and storage.
For this reason, the vibration etc. which arise at the time of case drawer | drawing-out and storage work can be suppressed to the minimum.
Therefore, it is possible to prevent an adverse effect on the optical line in which the optical connector in the module body and other optical modules are involved during the above operation.
[0070]
Further, the module main body is provided with a base portion on which the extra length storage case is placed, and the rotation connecting portion is provided at the rear end portion of the base portion, so that the extra length storage case can be drawn / stored. The center of rotation at the time can be provided at a position greatly separated from the optical connector.
For this reason, the vibration transmitted from the rotary connecting portion to the module main body is suppressed to the optical connector as much as possible when the extra length storage case is pulled out / stored, and the adverse effect on the optical fiber connected to the optical connector is reduced. Can be suppressed.
[0071]
Further, by arranging the extra length storage case on the module body in a stacked manner, the size (side area) of the extra length storage case can be set large. For this reason, the extra storage capacity can be increased, and the number of corresponding cores can be increased.
[Brief description of the drawings]
1A and 1B are diagrams showing an embodiment of an optical module of the present invention, where FIG. 1A is a plan view, FIG. 1B is a rear view, and FIG. 1C is a side view.
2A and 2B are diagrams showing the optical module shown in FIG. 1, wherein FIG. 2A is a front view, FIG. 2B is a side view, and FIG. 2C is an enlarged side view of the main part.
3A and 3B are diagrams showing another embodiment of the optical module of the present invention, in which FIG. 3A is a plan view, FIG. 3B is a rear view, and FIG. 3C is a side view.
4 is a diagram showing the optical module shown in FIG. 3, wherein (a) is a front view and (b) is a side view. FIG.
5A and 5B are views showing still another embodiment of the optical module of the present invention, in which FIG. 5A is a plan view, FIG. 5B is a rear view, and FIG. 5C is a side view.
6A and 6B are diagrams showing the optical module shown in FIG. 5, wherein FIG. 6A is a front view and FIG. 6B is a side view.
7 is a perspective view showing the optical module shown in FIGS. 1, 3, and 5. FIG.
FIGS. 8A and 8B are diagrams showing an optical wiring board in which the optical module shown in FIGS. 1, 3, and 5 is used, wherein FIG. 8A is a front view, and FIG. 8B is a bottom view showing a cable introduction unit; c) is an enlarged perspective view of a main part.
9 is a view showing a termination unit provided in the optical wiring board shown in FIG. 8, wherein (a) is a plan view, (b) is a front view, and (c) is a side view. FIG.
FIG. 10 is an optical wiring diagram in the optical wiring board shown in FIG. 8, showing a case where a cable-side optical fiber that is not connector-terminated is terminated using an optical module so that a connector can be connected.
11 is an optical wiring diagram in the optical wiring board shown in FIG. 8, showing a case where the cable-side optical fiber is an optical fiber drawn from an optical cable with a connector.
12A and 12B are diagrams showing an optical wiring board in which an example of a conventional optical module is used. FIG. 12A is a front view, and FIG. 12B is a side view.
FIG. 13 is a perspective view showing an example of a conventional optical module.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 20 ... Optical distribution board, 21b ... Connector arrangement | positioning part, 26 ... Optical cable, 28 ... Cable side optical fiber, 29 ... Optical fiber (optical cord), 291 ... Optical fiber (device side optical fiber), 292 ... Optical fiber (jumper cord) ), 29a ... Optical connector (optical connector plug), 31 ... Optical module (adapter module), 311 ... Optical connector (optical connector adapter), 32 ... Optical module (coupler module), 321 ... Optical connector (optical connector adapter), 33 ... Optical module (splitter module), 331 ... Optical connector (optical connector adapter), 62, 72, 82 ... Module body, 63, 73, 81 ... Extra length storage case

Claims (1)

A case-like module main body (62, 72) for housing the optical fiber (28), and an optical connector (311; provided on the side of the module main body, and terminated so that the optical fiber in the module main body can be connected to the connector. 321) and a surplus length storage case (63, 73) for storing the surplus length of the optical fiber,
The extra-length storage case is connected to the module main body via the rotary connecting portions (64, 77), and is pulled out of the module main body by rotation around the rotary connecting portion while maintaining the connection state by the rotary connecting portion. And can be stored,
The module main body (62, 72) includes a base (62a, 72a) on which the extra length storage case (63, 73) is placed,
The optical module (31, 32) is characterized in that the base part can be wired so that the optical fiber in the module main body reaches the extra length storage case via the inside of the base part .

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