JPH0777368B2 - Communication line setting method - Google Patents

Description

Detailed Description of the Invention [Industrial applications]

The present invention relates to a communication line setting method for mutual communication using an optical fiber line.

[Prior art]

When communicating with each other using an optical fiber line, the optical fiber cable contains a large number of optical fiber core wires, so which optical fiber core wire is connected to the other communication device You need to look on the other side. In this way, it may be possible to use a core line contrast machine to search for a communication line, but even if the core line contrast machine can be found, it is not possible to notify the other party unless the optical fiber core line is cut. Therefore, it is impossible to set the communication line. Therefore, it is conceivable to provide at least one of the two communication devices that communicate with each other, for example, on the preliminary side, with a local injection device and a local detection device of an optical fiber bending incidence / bending light receiving system. This local injection device and local detection device bend the optical fiber core wire with a very small diameter, and apply light from a light source to the bent portion from the outside to couple the light into the optical fiber or from the bent portion. This is a device for extracting leaked light to the outside, and generally, the smaller the bending diameter applied to the optical fiber core, the higher the coupling efficiency.

[Problems to be Solved by the Invention]

However, when the one side communication device is provided with the optical fiber bending incidence / bending light receiving type local injection device and the local detection device as described above, it is generally advantageous that the bending diameter of the optical fiber core wire is small. However, there are the following problems. First, if the bending diameter of the optical fiber core wire is made too small, the reliability of the optical fiber core wire is impaired. Secondly, when a large number of optical fiber core wires are bent one after another when searching for a communication line, a large loss is given to the optical fiber core wires when the bend diameter is small. There is a risk of causing the system to go down when the bent optical fiber core is actually used in another system. The first problem is that if the bending diameter is about 5 to 9 mm, it cannot be said that it is a big problem in the current optical fiber core wire,
In particular, the second problem is so serious that it cannot be practically used because it causes the destruction of other existing systems. It is an object of the present invention to provide a communication line setting method improved so as to find a communication line without easily destroying other active systems and to easily set the communication line.

[Means for Solving the Problems]

In order to achieve the above object, in the communication line setting method according to the present invention, one of a large number of optical fiber core wires is used.
A specific line setting signal that can be easily received by the communication device on the other side is transmitted from the communication device on one side to the optical fiber cable of the book, and on the communication device on the other side, it is sequentially transmitted to each optical fiber cable. The local detection device detects the line setting signal by giving a large diameter bend, and when this signal is detected for a specific optical fiber core,
The bending diameter of the optical fiber core wire is reduced to maintain the small bending diameter thereafter, and then the confirmation signal is coupled to the bent portion of the optical fiber core wire through the local injection device. A confirmation signal is sent to the communication device on the other side, the other side confirms the reception of this confirmation signal, and then sends a confirmation signal to the communication device on the other side, and the communication diameter on the other side is It is characterized in that the confirmation signal is received from the optical fiber core wire in the reduced size through the local detection device.

[Action]

One of the many optical fiber cores is a communication line,
The communication device on one side is previously connected to the optical fiber core wire. Then, a specific line setting signal is excited in the optical fiber core wire from the communication device on the one side. In the communication device on the other side, the optical fiber core wire in which this specific line setting signal is excited is searched from a large number of optical fiber core wires using a local detection device. At this time, since the above rotation setting signal is a signal that can be easily received by the communication device on the other side, even if the bending diameter of the optical fiber core wire is set to be large instead of being small, local detection It can be easily received by the communication device. Therefore, in order to search the optical fiber cores where this line setting signal is excited from a large number of optical fiber cores, when bending each optical fiber core one after another and receiving by the local detection device, the bending diameter is It is possible to suppress an increase in loss applied to each large optical fiber core wire to a small extent. As a result, even when another optical fiber core is actually used for another system, it is possible to prevent the system from being adversely affected. That is, it is possible to search for an optical fiber core wire which has been used as a communication line without fear of adversely affecting other active systems. By performing this search, when the line setting signal is received from a specific optical fiber core, the optical fiber core is determined to be a communication line. In this way, when the optical fiber core wire which is the communication line can be found, the bending diameter of the optical fiber core wire is reduced to the optimum bending diameter for local injection, and thereafter, the small bending diameter is maintained. Since this optical fiber core wire is a communication line and is not used for other systems,
There is no problem even if the bending diameter is reduced to give a large loss. Next, the confirmation signal is coupled to the bent portion of the optical fiber core wire having the reduced bending diameter from the communication device on the other side through the local injection device. As a result, the confirmation signal is sent from the other side to the one side through the optical fiber core wire which is the communication line. The communication device on one side can set the communication line by receiving the confirmation signal. After that, a confirmation signal is sent from the communication device on the one side to the communication device on the other side. The communication device on the other side can set the communication line by receiving the confirmation signal. At this time, since the confirmation signal is received via the bending portion having a small bending diameter and the local detection device, the confirmation signal is surely received. After the communication line setting is completed on both sides in this way, communication is performed between these two communication devices. At this time, in the communication device on the other side, the optical fiber core wire serving as the communication line is given an optimum bending with a small diameter, and the local injection device and the local detection device are mounted on this bending portion. Therefore, it is possible to transmit and receive signals with little loss.

【Example】

An embodiment of the present invention will be described below in detail with reference to the drawings. In FIG. 1, the optical fiber cable 1 includes a large number of optical fiber core wires 2, and one of the optical fiber core wires 2 is a line used for communication in this embodiment. In the example, the communication device (master device) 3 at the end of the one optical fiber core wire 2 is connected by a connector or the like. An adapter 5 including a local injection device and a local detection device is used on the side of the handset 4 of the telephone. Although not shown, the local injection device and the local detection device are provided with a bend having a very small diameter to the optical fiber core wire 2 and the light from the light source is applied to the bent portion from the outside so that light is emitted into the optical fiber core wire 2. It is a device for coupling and taking out the light leaking from the bent portion to the outside, and is housed in the adapter 5. When the adapter 5 is attached to each of the optical fiber core wires 2, the optical fiber core wire 2 is bent, and optical signals can be transmitted and received without cutting. In this embodiment, a line setting signal is always sent from the base unit 3 of the telephone when setting the line. This line setting signal is, for example, a specific signal modulated at a single frequency, but is not limited to this, and can be easily received by the local detection device of the adapter 5 on the side of the slave unit 4 and other signals. Any signal may be used as long as it can be distinguished from the measurement signal and has a low detection limit. On the side of the cordless handset 4, the adapter 5 is provided with a large number of optical fiber core wires 2
When the line setting signal can be received, it is determined that the optical fiber core wire 2 is a communication line. At this time, since the local detection device of the adapter 5 only needs to be able to receive the above-mentioned line setting signal, the bending diameter given to the optical fiber core wire 2 does not need to be small, and may be relatively large. Therefore, even if the adapter 5 is attached to each of a large number of optical fiber core wires 2 that may be actually used in other systems and bent, the optical fiber core wire 2 does not give a large loss, The worst case of down of the current system can be sufficiently prevented. That is,
For example, if the bending diameter is about 20 mm and a coupling efficiency of 20 to 30 dB is obtained, it is possible to receive the above-mentioned line setting signal sufficiently. At this time, the loss increase due to bending is 0.3d.
It becomes B or less so that the increase in loss of the optical fiber core wire 2 does not adversely affect the system. In this way, when the cordless handset 4 receives the line setting signal from the telephone master unit 3, the bending diameter of the optical fiber core wire 2 in the adapter 5 is set to a value necessary for the telephone call, that is, local injection and local detection. Make it as small as necessary. In that state, a confirmation signal is generated from the handset 4 and is excited to the optical fiber core wire 2 via the local injection device of the adapter 5. When the confirmation signal transmitted from the child device 4 is received by the parent device 3, the call line setting on the side of the parent device 3 ends.
After that, the master 3 sends a confirmation signal to the slave 4,
When the handset 4 receives this confirmation signal, the call line setting on the handset 4 side is completed. The procedure can be simplified by using the call signal as the confirmation signal from the slave unit 4 to the master unit 3. The above procedure can be performed manually or automatically. For example, when making a call using the FM modulation method, when a confirmation signal (calling signal) is transmitted from the handset 4 to the base unit 3 and is received by the base unit 3, the base unit 3 uses the FM modulation frequency or frequency lock by the signal. It is possible to make the necessary settings for calling. Further, when a confirmation signal is transmitted from the master unit 3 to the slave unit 4 and the confirmation signal is received by the slave unit 4, the slave unit 4 side can perform the same setting.

【The invention's effect】

According to the communication line setting method of the present invention, it is possible to increase the bending diameter given to the optical fiber core when the optical fiber core serving as the communication line is searched from among a large number of optical fiber cores. Therefore, it is possible to avoid a situation in which a large loss is caused to the optical fiber core wire used in another existing system and the system is adversely affected. Also, once the optical fiber core that is the communication line has been found, give a small diameter bend to the optical fiber core to make it the optimum bend diameter for the local injection device and the local detection device. Therefore, the confirmation signal can be surely transmitted / received, and the subsequent mutual communication can be surely performed in a state with less loss. Further, after searching for the optical fiber core wire which is the communication line, the optical fiber core wire can be bent to have a small diameter, and transmission / reception of a confirmation signal and communication line setting can be automatically performed.

[Brief description of drawings]

FIG. 1 is a schematic diagram for explaining one embodiment of the present invention. 1 ... Optical fiber cable, 2 ... Optical fiber core wire, 3
...... Caller (master), 4 …… Caller (slave), 5 …… Adapter.

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁶ Identification number Internal reference number FI Technical indication location H04B 10/12 10/13 10/135 (72) Inventor Masao Tanaka 1440 Rokuzaki, Sakura City, Chiba Prefecture Fujikura Electric Wire Co., Ltd.Sakura Factory (72) Inventor Yoshiharu Uwa 1440, Rosaki, Sakura City, Chiba Prefecture Fujikura Electric Co., Ltd.Sakura Factory (72) Inventor Koichi Sakurai, 1440, Rosaki, Chiba Prefecture Fuji Electric Co., Ltd.Sakura Factory (72) ) Inventor Toshiyuki Hayakawa 1-5-1 Kiba, Koto-ku, Tokyo Within Fujikura Electric Wire Co., Ltd. (56) Reference JP-A-2-21735 (JP, A) JP-A-63-261203 (JP, A) Special Kaihei 1-101504 (JP, A)

Claims (1)

[Claims] 1. A specific line setting signal that can be easily received by a communication device on one side is sent to one optical fiber core of a large number of optical fiber core lines,
In the communication device on the other side, the local setting device detects the above line setting signal by sequentially bending each optical fiber core wire with a large diameter, and this signal is detected for a specific optical fiber core wire. Then, the bending diameter of the optical fiber core wire is reduced to maintain the small bending diameter thereafter, and then the confirmation signal is coupled to the bent portion of the optical fiber core wire through the local injection device. By this, the confirmation signal is sent to the communication device on the other side, the other side confirms the reception of this confirmation signal, and then sends the confirmation signal to the communication device on the other side, and the communication device on the other side A method of setting a communication line, characterized in that the confirmation signal is received from an optical fiber core wire having a reduced bending diameter via a local detection device.