JP2000088704A - System and method for checking core - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate the need for the use of a dedicated core checking device and to facilitate confirmation of the output end of an optical fiber core at which a core contrasting light has arrived. SOLUTION: Core checking light of visible light outputted from a light source 41 for core checking arrives at an optical connector 75 on an optical distributing board 33 via an optical fiber 45, an optical switch 32, an optical fiber 92, an optical coupler 35, and an optical fiber core 71. As the core checking light of visible light is outputted in the case that the optical connector 75 is not connected, it is possible to confirm the arrival of the core checking light at the optical connector 75 by the naked eye. As the core checking light of visible light is subjected to diffuse transmission by a cap, which is a diffuse transmission member, in the case that the optical connector 75 is not connected and that the cap is installed, it is possible to confirm the arrival of the core checking light at the optical connector 75 by the naked eye from every direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical fiber control system and an optical fiber control method for each of a plurality of optical fibers included in an optical cable, and more particularly, to an optical fiber having a relatively short distance such as in a station. It is preferably used as a control for a cord.

[0002]

2. Description of the Related Art In an optical transmission system, an optical cable is laid between a station and another station or a subscriber terminal, and signal light is transmitted to each of a plurality of fiber cores included in the optical cable. Accordingly, for each of the plurality of optical fiber cores, it is necessary to connect both terminals of each optical fiber core and to connect a device or another optical fiber or the like to each terminal.

[0003] To cope with each of a plurality of optical fiber cores included in an optical cable, a core control system is used. A cord contrast system is disclosed in, for example,
As disclosed in Japanese Patent Application Publication No. 149075, one of the optical couplers provided in each of the plurality of optical fiber cores is selected, and the optical coupler receives the optical fiber reference light, and the optical coupler is connected to the optical coupler. The optical fiber is provided with a coupler to transmit optical fiber contrast light to perform optical fiber contrast.

[0004]

In the conventional optical fiber contrast system, optical fiber contrast light having a wavelength with a small transmission loss in the optical fiber is used. That is, the wavelength of the core wire control light was in the 1.55 μm band or the 1.3 μm band.
Then, at the output end of the fiber contrast light of the optical fiber, a dedicated fiber contrast device having light receiving sensitivity at the wavelength of the fiber contrast light is used to determine whether the fiber contrast light has arrived. Needed.

[0005] In addition, in the optical fiber contrast operation, a worker arranged on the side of the output end of optical fiber contrast light of the optical fiber core is notified in advance of the optical fiber number of the optical fiber core to be subjected to optical fiber comparison. The operator has checked using a fiber optic comparator whether or not the fiber optics reached the output end of the optical fiber according to the previously notified fiber number. However, if the output end of the optical fiber core wire reached by the fiber contrast light and the previously notified core number are different from each other, the operator needs to check the optical fiber core fiber reached by the fiber contrast light. Had to be searched for the output end using a fiber optic contrast device. This search operation was extremely difficult because there were thousands of optical fiber cores.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and does not require the use of a dedicated fiber optic comparator, and makes it possible to easily output the output end of the optical fiber cable to which the fiber optics arrives. It is an object to provide a cord control system and a cord control method that can be confirmed.

[0007]

SUMMARY OF THE INVENTION According to the present invention, there is provided an optical fiber contrast system for comparing a plurality of optical fibers, and (1) outputting visible optical fiber contrast light. (2) a plurality of optical fiber cores, each of which has an optical coupler module provided with an optical coupler for transmitting the core reference light arrived from the core fiber light source to each optical fiber core; (3) Select one of the optical couplers in the optical branching module, input the fiber contrast light output from the fiber contrast light source to the optical coupler, and select the optical fiber core provided with the optical coupler. And an optical switch for transmitting the optical fiber contrast to the wire. According to this fiber contrast system, the fiber contrast light of visible light output from the fiber contrast light source is transmitted to a plurality of optical fibers via any one of the optical couplers in the optical module selected by the optical switch. An optical fiber core provided with the optical coupler among the cores is transmitted. Since the fiber contrast light output from the other end of the optical fiber is visible light, it is possible to visually check whether the fiber contrast light has reached the other end of the fiber. .

[0008] In addition, the cord control system according to the present invention comprises:
A diffuse transmission member that diffuses and transmits the core control light that has reached the terminal to a terminal that outputs the core control light input to each optical coupler provided in each of the plurality of optical fiber cores and that is connected to an unconnected terminal. Is further provided. In this case, since the optical fiber contrast light of visible light output from the terminal of the optical fiber is diffused and transmitted by the diffusion transmitting member,
Whether or not the optical fiber reference light has reached the terminal of the optical fiber core can be visually confirmed from all directions.

[0009] A core wire contrast method according to the present invention is a core wire contrast method for comparing each of a plurality of optical fiber core wires,
Selecting one of the optical couplers provided in each of the plurality of optical fiber cores, inputting the optical fiber reference light, which is visible light, to the optical coupler, and selecting the optical fiber provided with the optical coupler; The present invention is characterized in that a core line is transmitted by transmitting a core line contrast light to the core line. According to this cord contrast method,
Since the fiber contrast light output from the other end of the optical fiber is visible light, it is possible to visually check whether the fiber contrast light has reached the other end of the fiber. .

[0010] In the core wire contrast method according to the present invention, the terminal for outputting the core wire contrast light input to each of the optical couplers provided in each of the plurality of optical fibers, and the unconnected terminal is connected to the terminal. A diffuse transmission member is provided for diffusing and transmitting the core line contrast light reaching the terminal, and the core line comparison is performed based on the presence or absence of the diffuse transmission of the core line contrast light in the diffusion transmission member. In this case, since the visible light core control light output from the terminal of the optical fiber core is diffused and transmitted by the diffusion transmitting member, it is determined whether the core control light reaches the terminal of the optical fiber core. Can be visually confirmed from all directions.

[0011]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. In the description of the drawings, the same elements will be denoted by the same reference symbols, without redundant description.

(First Embodiment) First, a configuration of a first embodiment of a cord contrast system according to the present invention will be described. FIG. 1 is a schematic configuration diagram of an optical transmission system including a core line contrast system according to the first embodiment. This system includes a transmission device 10, a star coupler frame 20, an optical cable termination frame 30, light sources 41 and 42 for optical fiber contrast, an optical pulse tester 43, a light source 44 for loss test, and a control device 50 in a station. The terminal 30 and each of the subscriber terminals 61 to 64 are connected via an optical cable 70.

The transmission device 10 transmits signal light to be transmitted to each of the subscriber terminals 61 to 64 to the star coupler frame 20 via the optical fiber 80. The transmission device 10 includes an optical filter 11 at a signal light output end. The optical filter 11 transmits the signal light but blocks the fiber contrast light output from the fiber contrast light source 41. .

The star coupler frame 20 receives the signal light arriving from the transmission device 10 via the optical fiber 80, makes a multi-branch (four-branch here) by the star coupler 21, Transmit light. An optical connector 8 is connected to the output end of each of the optical fibers 81 to 84.
5 to 88 are provided. The wavelength of the signal light is 1.55 μm, which is the wavelength at which transmission loss in the optical fiber is low.
An m band or a 1.3 μm band is used.

The optical cable termination 30 includes an optical branch module 31, an optical switch 32, and an optical distribution board 33.
The optical branch module 31 is provided with optical couplers 35 to 38 on the respective paths of the optical fiber cores 71 to 74 included in the optical cable 70. Optical fibers 91 and 92 are connected to the optical coupler 35, optical fibers 93 and 94 are connected to the optical coupler 36, optical fibers 95 and 96 are connected to the optical coupler 37, and
Optical fibers 97 and 98 are connected to 8. For example, the light that has reached the optical coupler 35 via the optical fiber 91 is transmitted to the subscriber terminal 61 via the optical fiber core 71 and the optical coupler 3 via the optical fiber 92.
The light that has reached 5 is transmitted to the optical connector 75 via the optical fiber core 71. The optical switch 32 connects any one of the optical fibers 91 to 98 and any one of the optical fibers 45 to 48 based on an instruction from the control device 50. In the optical distribution board 33, optical connectors 75 to 78 connected to the respective ends of the optical fiber cores 71 to 74 are arranged.

The core light source 41 outputs visible light to the optical fiber 45 as core light. On the other hand, the core wire reference light source 42 outputs light in the 1.55 μm band or 1.3 μm band, which is a wavelength at which transmission loss in the optical fiber is low, to the optical fiber 46 as core wire reference light. Optical pulse tester 4
3 outputs the pulse light to the optical fiber 47,
The backscattered light accompanying this is input from the optical fiber 47,
Perform OTDR test. The loss test light source 44 outputs a constant power loss test light to the optical fiber 48 to test the transmission loss.

The control device 50 controls each of the optical switch 32, the light sources 41 and 42 for optical fiber contrast, the optical pulse tester 43, and the light source 44 for loss test. The control device 50
Receives the OTDR test result from the optical pulse tester 43.

FIG. 2 is an explanatory diagram of the optical distribution board 33 of the optical cable termination 30. Actually, the number of optical connectors arranged on the optical wiring board is as large as several thousand. However, for the sake of simplicity, this figure shows an optical wiring board 33 in which 3 × 4 optical connectors are arranged. ing. As shown in this figure, among the optical connectors arranged in the optical distribution board 33, the optical connector 87 of the optical fiber 83 is connected to the optical connector 75, the optical connector 88 of the optical fiber 84 is connected to the optical connector 76,
The optical connector 86 of the optical fiber 82 is connected to the optical connector 78. On the other hand, a cap 77a is attached to the unconnected optical connector 77. Caps are also attached to other unconnected optical connectors. The cap 77 a and the like are used as a diffusion transmitting member that diffuses and transmits the core line contrast light that has reached the optical connector 77.

Next, an example of the operation of the cord control system according to the present embodiment will be described, and a cord control method according to the present embodiment will be described.

First, an optical fiber to be compared is determined from the optical fibers 71 to 74 included in the optical cable 70. For example, an optical fiber core 71 is to be compared with a core. A connection instruction signal corresponding to the core number of the optical fiber 71 is provided from the control device 50 to the optical switch 32. Based on this connection instruction signal,
In the optical switch 32, the optical fiber 92 and the optical fiber 45 are connected. Then, the optical fiber 45, the optical switch 32, the optical fiber 92, the optical coupler 3, and the optical fiber 45 are output from the optical fiber light source 41.
5 and an optical connector 75 on the optical distribution board 33 via the optical fiber core 71.

If the optical connector 75 is not connected, the optical fiber reference light of visible light is output from the optical connector 75. Therefore, it is possible to visually confirm that the optical fiber 75 reaches the optical connector 75. it can. Further, when the optical connector 75 is not connected and a cap which is a diffuse transmission member is attached, the optical fiber reference light of the visible light is diffused and transmitted by the cap. Can be visually confirmed from all directions. Since the path length from the optical fiber reference light source 41 to the optical distribution board 33 in the station is about several tens of meters, even if the optical fiber contrast light is visible light, it reaches the optical distribution board 33 with sufficient power. .

Subsequently, based on an instruction signal from the control device 50, the optical fiber 91 and the optical fiber 46 are connected in the optical switch 32. Then, a fiber optic reference light is output from the fiber optic light source 42, and the fiber optic light is output from the optical fiber 46, the optical switch 32, the optical fiber 91, and the optical coupler 3.
5 and the subscriber terminal 61 via the optical fiber core 71. Thereafter, based on the instruction signal from the control device 50, the optical fiber 91 and the optical fiber
7 and the optical pulse tester 43 performs an OTDR test of the optical transmission path up to the subscriber terminal 61.
Further, the optical switch 32 connects the optical fiber 91 and the optical fiber 48, and the loss test light source 44 performs a loss test on the optical transmission path leading to the subscriber terminal 61.

As described above, it can be confirmed that the optical connector 75 on the optical distribution board 33 and the subscriber terminal 61 are normally connected via the optical fiber core 71. Then, the optical connector 87 of the optical fiber 83 connected to the star coupler 21 of the star coupler frame 20 is connected to the optical connector 75 on the optical distribution board 33. Thereby, the transmission device 10
Is output from the subscriber terminal 61 via the optical fiber 80, the star coupler 21, the optical fiber 83, the optical connector 87, the optical connector 75, and the optical fiber core 71.
Reliably reach. The same applies to each of the other optical fibers 72 to 74.

(Second Embodiment) Next, the configuration of a second embodiment of the optical fiber contrast system according to the present invention will be described. FIG. 3 is a schematic configuration diagram of an optical transmission system including a core line contrast system according to the second embodiment. In this figure, the transmission device 10, the star coupler frame 20, the optical branching module 31, the control device 50, the subscriber terminals 61 to 64, and the optical cable 70 are the same as in the first embodiment, and are therefore omitted.

In this embodiment, optical switches 32A and 32B are provided in the optical cable termination frame 30. Also,
A core contrast light source 41A that outputs visible core contrast light,
41B is provided in each of the optical switches 32A and 32B. Core wire contrast light source 42, optical pulse tester 43
And the loss test light source 44 are connected to the optical switch 32.
It can be connected to any of the optical switches 32A and 32B via C.

The core control light output from the core control light source 42 passes through one of the optical switches 32A and 32B based on the connection selection in the optical switch 32C, and is connected to one of the optical fiber cores in the optical cable 70. Introduced into the line. The same applies to the pulse light output from the optical pulse tester 43 and the loss test light output from the loss test light source 44. On the other hand, the visible optical fiber contrast light output from the optical fiber contrast light source 41A is introduced from the optical switch 32A to any optical fiber optical fiber in the optical cable 70,
The optical fiber contrast light of the visible light output from the optical fiber contrast light source 41B is introduced from the optical switch 32B to any one of the optical fibers in the optical cable 70.

The optical fiber contrast system according to the present embodiment has the following effects in addition to the effects of the first embodiment. That is, by providing the optical fiber contrast light sources 41A and 41B for outputting visible optical fiber contrast light in the two optical switches 32A and 32B provided in parallel with each other, the optical fiber contrast light sources 41A and 41B respectively. Can be operated independently of each other, and the center line can be compared with visible light, and the work efficiency can be improved.

[0028]

As described above in detail, according to the present invention, any one of the optical couplers provided in each of the plurality of optical fiber cores is selected and the visible light is applied to the selected optical coupler. Is input, and the optical fiber core provided with the optical coupler transmits the optical fiber reference light to perform optical fiber contrast. By doing so, since the fiber contrast light output from the other end of the optical fiber is visible light, it is determined whether the fiber contrast light reaches the other end of the fiber. It can be confirmed with the naked eye.

Also, the core reference light reaching the terminal is diffused to the unconnected terminal, which is a terminal for outputting the core reference light input to each optical coupler provided in each of the plurality of optical fiber cores. A diffuse transmission member that transmits the light is provided, and the core is compared based on the presence or absence of diffuse transmission of the core line contrast light in the diffusion transmission member. In this case, since the core light of visible light output from the terminal of the optical fiber is diffused and transmitted by the diffusion transmitting member, it is determined whether the core light reaches the terminal of the optical fiber. Can be visually confirmed from all directions.

Therefore, it is not necessary to use a dedicated optical fiber contrast device, and the output end of the optical fiber core wire to which the optical fiber contrast light arrives can be easily confirmed, thereby improving the workability of optical fiber contrast.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of an optical transmission system including a core wire contrast system according to a first embodiment.

FIG. 2 is an explanatory diagram of an optical distribution board 33 of the optical cable termination frame 30.

FIG. 3 is a schematic configuration diagram of a part of an optical transmission system including a core wire contrast system according to a second embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Transmission apparatus, 11 ... Optical filter, 20 ... Star coupler frame, 21 ... Star coupler, 30 ... Optical cable termination frame,
31 ... Optical branch module, 32, 32A, 32B, 32
C: optical switch, 33: optical wiring board, 35 to 38: optical connector, 41, 42, 42A, 42B: light source for optical fiber contrast,
43: Optical pulse tester, 44: Light source for loss test, 45 to 45
48 optical fiber, 50 control device, 61-64 subscriber terminal, 70 optical cable, 71-74 optical fiber core, 75-78 optical connector, 80-84 optical fiber, 85-88 optical Connectors, 91 to 98: Optical fibers.

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Yoshifumi Hishikawa 1F, Tayacho, Sakae-ku, Yokohama-shi, Kanagawa F-term (reference) 2F065 AA18 AA22 BB12 BB22 CC23 DD06 FF12 FF21 GG04 GG22 HH04 JJ01 LL00 LL03 LL24 NN03 QQ28 2G086 AA01 BB01 CC03 2H038 CA39

Claims (4)

[Claims] An optical fiber contrast system that contrasts each of a plurality of optical fibers, comprising: a light source for optical fiber output that outputs visible light as optical fiber contrast; An optical branching module provided with an optical coupler for transmitting the core contrasting light arrived from the core contrasting light source to each optical fiber core, and selecting any one of the optical couplers in the optical branching module, An optical switch that inputs the optical fiber reference light output from the optical fiber light source to the optical coupler, and transmits the optical fiber contrast light to an optical fiber core provided with the optical coupler. A cord contrast system characterized by the following. 2. A terminal for outputting the core reference light input to each optical coupler provided in each of the plurality of optical fiber cores, the terminal being unconnected, and the core reference light reaching the terminal. 2. The optical fiber contrast control system according to claim 1, further comprising: a diffusion transmitting member that diffuses and transmits light. 3. A method for comparing each of a plurality of optical fiber cores, comprising selecting one of optical couplers provided in each of the plurality of optical fiber cores, A core line contrasting method comprising: inputting a core line contrast light, which is visible light, to an optical coupler, and performing the core line contrast by transmitting the core line contrast light to an optical fiber core wire provided with the optical coupler. . 4. A terminal for outputting the core reference light input to each optical coupler provided in each of the plurality of optical fiber cores, the terminal being unconnected and the core control reaching the terminal. 4. A core transmission device according to claim 3, further comprising: a diffusion transmission member for diffusing and transmitting light, wherein the core transmission is performed based on whether or not the core transmission light is transmitted through the diffusion transmission member.
The described cord control method.