JP2001185783A - Device and method or preventing laser beam unnecessary leakage and optical communication system using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a laser beam unnecessary leakage preventing device for reducing any danger on a human body due to the irradiation with laser beams emitted from an optical module or the like even when an optical cable at home is removed. SOLUTION: At the time of connecting an optical plug 10 to an optical connector, conductor connecting terminals 13 and 14 are simultaneously connected with an optical cable core. At the time of connecting the optical plugs 10 at both the edges of a composite cable 15, the conductor connecting terminals of the optical connectors at both the edges are connected to each other. This state is electrically detected so that it is possible to detect the state even when either of the optical plugs 10 at both the edges of the composite cable 15 is removed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical communication system, a device for preventing unnecessary leakage of laser light used therefor, and a method for preventing unnecessary leakage of laser light, and more particularly to a laser light in a communication system which is completely opticalized from a communication station building to a house. Regarding prevention of unnecessary leakage.

[0002]

2. Description of the Related Art In the case of a communication system that is completely opticalized from a communication station building to a house, it is wired using an optical cable to an optical line terminal in the house. Communication is performed using a high-brightness laser beam in the optical cable.

However, if an optical line terminal or an optical cable is disconnected due to an accident or intention,
There is a possibility that the laser light leaks from the end of the optical line terminating device, the connector of the drawing-in part in the house, the end of the optical cable, or the like, and irradiates the skin or the like or directly looks into the body, which may cause danger to the human body.

[0004]

In the conventional communication system described above, the connection state is not detected even if the optical connector is disconnected, so that the laser light leaks from the optical connector portion while the light is emitted from the optical module, or The laser light leaks from the opposite side of the optical cable connected to the optical connector. In particular, it is considered that there is a high risk to the human body on the user side who may have little knowledge about optical communication.

[0005] Therefore, an object of the present invention is to solve the above-mentioned problems and to reduce the danger to the human body due to the irradiation of laser light emitted from optical modules even if the optical cable in the house is disconnected. It is an object of the present invention to provide a device for preventing unnecessary leakage of laser light and a method for preventing unnecessary leakage of laser light.

Another object of the present invention is to reduce the danger to the human body due to the irradiation of the laser light emitted from the optical modules even if the optical cable in the house is disconnected. An object of the present invention is to provide an optical communication system capable of simultaneously preventing laser light leakage from the side.

[0007]

SUMMARY OF THE INVENTION According to the present invention, there is provided a device for preventing unnecessary leakage of laser light, comprising: a composite cable comprising a pair of an optical fiber core for transmitting an optical signal and a conductor; Detecting means for detecting a disconnected state of the optical fiber; and means for stopping output of a laser beam to be transmitted to the optical core wire when the disconnected state of the optical fiber is detected by the detecting means.

According to the method for preventing unnecessary leakage of laser light according to the present invention, a disconnection state of the optical fiber is detected from a conduction state of a composite cable composed of a pair of an optical fiber for transmitting an optical signal and a conductor. When the disconnection state of the optical fiber is detected, the laser beam output to the optical fiber is stopped.

An optical communication system according to the present invention is an optical communication system for transmitting and receiving a signal from an optical line terminal to an in-home device by an optical signal, comprising a set of an optical fiber for transmitting the optical signal and a conductor. A composite cable for connecting the optical line terminal and the in-home device, and a disconnection state of the optical core wire is detected from a conduction state of a lead wire of the composite cable provided in each of the optical line terminal and the in-home device. Detecting means, and means provided in each of the optical line terminal and the in-home device, and means for stopping a laser beam output to be transmitted to the optical core wire when the disconnection state of the optical core wire is detected by the detecting means. Have.

That is, the optical communication system of the present invention leaks from devices and optical cables constituting an optical communication system when an optical cable connecting a home section such as a home or an office is disconnected due to an accident or intention. Means for stopping the laser light to be emitted.

In the case of a communication system that is completely opticalized from the communication station building to the house, it is wired using an optical cable from the communication station building to the optical line terminal in the house. Communication with the device is performed using laser light. In many cases, the laser light has a high output in consideration of long-distance transmission, and if the optical cable is disconnected and irradiated with the laser light, there is a possibility that a danger to a human body or the like may be given. In particular, in a high-risk home section, the connection optical cable detects the attachment / detachment state, and a means for autonomously stopping the output of laser light when the optical cable is in an unconnected state is configured to prevent the danger. This can be prevented.

More specifically, the unnecessary leakage prevention device for laser light of the present invention has a structure in which the transmission side and the reception side of an optical cable are integrated, and can be connected or disconnected simultaneously. The optical plug has a transmission-side optical fiber connection surface and a reception-side optical fiber connection surface.When the optical plug is connected to the optical connector, it is connected to the transmission-side optical connection sleeve and the reception-side optical connection sleeve, respectively. The connection of the optical cable is performed.

In addition, the optical plug has two conductor connection terminals. The composite cable is a four-wire system, two of which are optical fibers on the transmission side and the reception side, and the other two are conductors, which are respectively connected to conductor connection terminals. Both ends of the composite cable are constituted by optical plugs having the same shape.

The optical connector has a conductor connection terminal fitted to the conductor connection terminal, and a conductor connection terminal fitted to the conductor connection terminal. Each of the optical connectors is connected to a board connection terminal, and is connected to a board or the like on which the optical connector is mounted. Connectable.

When the optical plug is connected to the optical connector, the conductor connection terminal is connected simultaneously with the optical fiber. When both optical plugs at both ends of the composite cable are connected, the conductor connection terminals of the optical connectors at both ends are connected. By electrically detecting this state, even if one of the composite cables is disconnected, the state can be detected.

As described above, by using the composite cable of the optical fiber and the conductor, the connection state is detected electrically and the laser light emission is automatically stopped when the connection state is not established. Even when the optical cable in the house is disconnected, it is possible to reduce the risk to the human body due to the irradiation of the laser light emitted from the optical modules.

Also, since the optical line terminal detects the light input state and automatically stops the emission of the laser light when the light input is interrupted, the laser light leakage from the cable side can be prevented at the same time. It becomes possible.

Further, the laser light output is not stopped by a mechanical structure using a shielding plate or the like, but the laser light output itself is stopped by an electrical structure. Malfunctions can be avoided, and safety can be ensured by stopping the laser light output itself.

[0019]

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1A is a plan view of an optical plug at an end of an optical cable according to an embodiment of the present invention.
1B is a front view of the optical plug at the end of the optical cable according to one embodiment of the present invention, and FIG. 1C is a side view of the optical plug at the end of the optical cable according to one embodiment of the present invention.

FIG. 2A is a rear view of the optical connector according to one embodiment of the present invention, and FIG. 2B is a side view of the optical connector according to one embodiment of the present invention, and FIG. FIG. 2 is a front view of the optical connector according to one embodiment of the present invention, and FIG.
FIG. 2D is a bottom view of the optical connector according to one embodiment of the present invention, and FIG. 2E is a partial cross-sectional view along the line AA in FIG. 2C.

The principle of one embodiment of the present invention will be described with reference to FIGS. In the example shown in FIGS. 1 and 2 described above, the transmission side and the reception side of the optical cable are integrated, and have a structure that can be connected or disconnected simultaneously.

The optical plug 10 has a transmitting side optical fiber connection surface 11
When the optical plug 10 is connected to the optical connector 20, the optical cable is connected to the transmitting optical connecting sleeve 21 and the receiving optical connecting sleeve 22, respectively. Will be

In addition, the optical plug 10 has two conductor connection terminals 13 and 14. The composite cable 15 is a four-wire type, of which two wires are optical fibers on the transmission side and the reception side, and the remaining two wires are conductors.
14 are connected to each other. Both ends of the composite cable 15 are constituted by optical plugs 10 having the same shape.

The optical connector 20 has a lead wire connection terminal 1.
There is a conductor connection terminal 23 fitted to the connector 3 and a conductor connection terminal 24 fitted to the conductor connection terminal 14. The substrate (not shown) is connected to the board connection terminals 25 and 26 and mounts the optical connector 20. And so on.

When the optical plug 10 is connected to the optical connector 20, the conductor connection terminals 13 and 14 are connected together with the optical fiber. When both the optical plugs 10 at both ends of the composite cable 15 are connected, the conductor connection terminals 23 of the optical connector 20 at both ends,
24 will be connected to each other. By electrically detecting this state, even if one of the composite cables 15 is disconnected, the state can be detected.

FIG. 3 is a diagram showing a configuration of an optical communication system according to one embodiment of the present invention. In FIG. 3, in the optical communication system according to one embodiment of the present invention, a two-line optical cable 31 from a station building 30 travels along a telephone pole 35 or the like to an optical closure 32 near the subscriber's home to a terminal box (BX) in the subscriber's home. 3
3 and is connected from the terminal box 33 to the optical line terminal 34 using the composite cable 15 described above.

FIG. 4 is a block diagram showing a configuration of an optical communication system according to one embodiment of the present invention. In FIG. 4, the optical line terminal 40 installed in the office 30 includes an optical transmitting module 41, an optical receiving module 42, and an optical input state detecting unit 43. The light emission from the light transmission module 41 is stopped when the light input to the reception module 42 cannot be detected.

A connection from the optical line terminal 40 to the terminal box 33 at the subscriber's house is connected by a two-wire optical cable 31. The optical connector 20 is mounted on the subscriber side of the terminal box 33, and the composite cable 15 is connected via the optical plug 10.

The conductor connection terminal 23 of the optical connector 20
And the conductor connection terminal 24 are connected together on the substrate. As a result, when the composite cable 15 is correctly connected,
It becomes possible to detect an electrical loop state on the optical line terminal 34 side.

At the end of the composite cable 15, the optical plug 1
The optical connector 20 'of the optical line terminal 34 is connected via 0'. The optical line terminal 34 includes an optical receiving module 44 and an optical transmitting module 45, and a user uses a user interface 47 for performing photoelectric conversion. Further, there is an electric loop detection function 46 by connection of the composite cable 15, and when an open loop is detected, light emission from the optical transmission module 45 can be stopped.

The operation of the optical communication system according to one embodiment of the present invention will be described with reference to FIGS.

When the terminal box 33 and the optical line terminal 34 are connected by the composite cable 15, the electric loop detecting function 46 detects the electric loop state of the conducting wire folded back by the terminal box 33. Then, the light is emitted from the optical transmission module 45. As a result, the light input state is detected by the light input state detection unit 43, and the light is emitted from the light transmission module 41. As a result, optical communication in a normal state is performed.

Next, when the connection is disconnected from the optical connector 20 'on the side of the optical line terminal 34, the electrical loop detection function 46 cannot detect the electrical loop state of the conductor, so that the optical transmission module 45 To stop emitting light.
At the same time, the optical input state detecting unit 43 enters the optical input disconnection state, and stops emitting light from the optical transmission module 41. As a result, leakage of laser light from the optical connector 20 'of the optical line terminal device 34 can be prevented, and leakage of laser light from the optical plug 10' can also be prevented.

The optical connector 2 on the terminal box 33 side
Even when the connection is disconnected from 0, the electric loop detection function 46 cannot detect the electric loop state of the conducting wire, and thus the light emission from the optical transmission module 45 is stopped. At the same time, the optical input state detecting unit 43 enters the optical input disconnection state, and stops emitting light from the optical transmission module 41. As a result, the optical connector 2 of the terminal box 33
It is possible to prevent the leakage of the laser light from zero, and also to prevent the leakage of the laser light from the optical plug 10.

As described above, by using the composite cable 15 composed of the optical fiber and the conductor, the electric loop detection function 4 is provided.
6, the connection state can be electrically detected, and the laser light emission is automatically stopped when the connection state is not established. Therefore, even if the optical cable in the house is disconnected, the light is emitted from the optical modules. The degree of danger to the human body due to laser light irradiation can be reduced.

In addition to the above configuration, the light input state detection unit 43 also detects the light input state on the side of the station 30 and automatically stops laser light emission when the light input is cut off.
Laser light leakage from the cable side can also be prevented at the same time.

Further, the laser light output is not stopped by a mechanical structure using a shielding plate or the like, but the laser light output itself is stopped by an electrical structure. Malfunction can be avoided, and safety can be ensured by stopping the laser beam output itself.

FIG. 5 is a block diagram showing a configuration of an optical communication system according to another embodiment of the present invention. In FIG.
In another embodiment of the present invention, one embodiment of the present invention is a four-wire composite cable 15 having a two-wire optical transmission / reception and a two-wire conductor.
And the composite optical connector 20 and the optical plug 10 are used.
A wire composite cable is used.

That is, in another embodiment of the present invention, the down line (station 30 side → subscriber house side) and the up line (subscriber house → station 30 side) connect the optical connector 50 and the optical plug 51, respectively. Connected by another two-wire type composite cable 52. In this case, the operation of the other embodiment of the present invention is the same as that of the optical communication system according to the embodiment of the present invention shown in FIG. 4 and the effect thereof is the same, so that the description thereof will be omitted.

[0040]

As described above, according to the apparatus for preventing unnecessary leakage of laser light of the present invention, the conduction state of the conductor of a composite cable composed of a pair of an optical conductor for transmitting an optical signal and a conductor is determined based on the conduction state of the conductor. By detecting the disconnection state and stopping the laser light output to be sent to the optical fiber when the disconnection state of the optical fiber is detected, even if the optical cable in the house is disconnected, the optical module There is an effect that the danger to the human body due to the irradiation of the laser light emitted from the light source can be reduced.

According to the optical communication system of the present invention,
In an optical communication system for transmitting and receiving a signal from an optical line terminal to an optical network device by using an optical signal, the optical line communication device connects the optical network device and the optical network device to each other with a composite cable composed of a pair of a conductor. In the event that the optical line terminal in the home is disconnected by stopping the laser beam output to be sent to the optical core line when each of the optical line terminal and the in-home device detects the disconnection state of the optical fiber core from the conduction state of the conductor of the composite cable, Even in the event of an accident, it is possible to reduce the risk of harm to the human body due to the irradiation of the laser light emitted from the optical modules, and to prevent the leakage of the laser light from the cable side at the same time.

[Brief description of the drawings]

1A is a plan view of an optical plug at an end of an optical cable according to an embodiment of the present invention, FIG. 1B is a front view of an optical plug at the end of the optical cable according to an embodiment of the present invention, and FIG. 1 is a side view of an optical plug at an end of an optical cable according to an embodiment of the present invention.

2A is a rear view of an optical connector according to one embodiment of the present invention, FIG. 2B is a side view of the optical connector according to one embodiment of the present invention, and FIG. FIG. 3D is a front view of the connector, FIG. 4D is a bottom view of the optical connector according to one embodiment of the present invention, and FIG. 4E is a partial cross-sectional view taken along line AA of FIG.

FIG. 3 is a diagram showing a configuration of an optical communication system according to one embodiment of the present invention.

FIG. 4 is a block diagram showing a configuration of an optical communication system according to one embodiment of the present invention.

FIG. 5 is a block diagram showing a configuration of an optical communication system according to another embodiment of the present invention.

[Explanation of symbols]

 10, 10 ', 51 Optical plug 11 Transmission side optical fiber connection surface 12 Receiving side optical fiber connection surface 13, 14, 23, 24 Conductive line connection terminal 15 Composite cable 20, 20', 50 Optical connector 21 Transmission side optical connection Sleeve 22 Receiving-side optical connection sleeve 25, 26 Board connection terminal 30 Local office 31 Optical cable 32 Optical closure 33 Terminal box 34 Optical line termination device 35 Telegraph pole 40 Station-side termination device 41, 45 Optical transmission module 42, 44 Optical receiving module 43 Light Input state detector 46 Electrical loop detection function 47 User interface 52 Two-wire composite cable

Claims (12)

[Claims] 1. A composite cable comprising a set of an optical fiber for transmitting an optical signal and a conductor, a detecting means for detecting a disconnected state of the optical fiber from a conduction state of the conductor of the composite cable, and the detection Means for stopping output of laser light to be sent to the optical core wire when the disconnection state of the optical fiber is detected by means. 2. An optical plug provided at both ends of the composite cable and fitted to an optical connector on an electric device side, wherein the optical plug is detachably attached to the optical connector at the same time when the optical fiber is attached to and detached from the optical connector. 2. The device for preventing unnecessary leakage of laser light according to claim 1, wherein the device has a possible structure. 3. The four-wire cable according to claim 1, wherein the composite cable comprises a set of an optical fiber and a conductor on a transmitting side and a set of an optical fiber and a conductor on a receiver. 3. The device for preventing unnecessary leakage of laser light according to claim 1 or 2. 4. The composite cable according to claim 1, wherein a pair of the optical fiber and the conductor on the transmission side and a pair of the optical fiber and the conductor on the reception side are respectively independent two-wire cables. 3. The device for preventing unnecessary leakage of laser light according to claim 1. 5. A disconnection state of said optical core wire is detected from a conduction state of a conductor of a composite cable comprising a pair of an optical core wire for transmitting an optical signal and a conductor, and the disconnection state of said optical core wire is detected. A method for preventing unnecessary leakage of laser light, wherein the output of laser light to be transmitted to the optical core wire is stopped when the operation is performed. 6. An optical plug provided at both ends of the composite cable and fitted to an optical connector on an electric device side, wherein the optical plug is detachably attached to and detached from the optical connector at the same time. 6. The method for preventing unnecessary leakage of laser light according to claim 5, wherein the method has a possible structure. 7. The four-wire cable according to claim 1, wherein the composite cable comprises a set of an optical fiber and a conductor on a transmission side and a set of an optical fiber and a conductor on a reception side. 7. The method for preventing unnecessary leakage of laser light according to claim 5 or 6. 8. The composite cable according to claim 1, wherein a pair of the optical fiber and the conductor on the transmitting side and a pair of the optical fiber and the conductor on the receiving side are independent two-wire cables. 7. The method for preventing unnecessary leakage of laser light according to claim 5. 9. An optical communication system for transmitting / receiving a signal from an optical line terminal to an in-home device by an optical signal, comprising an optical fiber core and a conductor for transmitting the optical signal, wherein A composite cable connecting between the in-home device and detection means provided in each of the station-side device and the in-home device and detecting a disconnection state of the optical fiber from a conduction state of a conductor of the composite cable; Means for stopping the laser beam output to the optical fiber when the disconnection state of the optical fiber is detected by the detection means. Optical communication system. 10. An optical plug provided at both ends of the composite cable and fitted to an optical connector on an electric device side,
10. The optical communication system according to claim 9, wherein said optical plug has a structure in which said optical core wire and said conducting wire can be simultaneously attached and detached when said optical plug is attached to and detached from said optical connector. 11. The compound cable according to claim 1, wherein the composite cable is a four-wire cable in which a set of an optical fiber and a conductor on a transmission side and a set of an optical fiber and a conductor on a reception side are integrated. The optical communication system according to claim 9 or 10. 12. The composite cable according to claim 1, wherein a pair of the optical fiber and the conductor on the transmitting side and a pair of the optical fiber and the conductor on the receiving side are respectively independent two-wire cables. The optical communication system according to claim 9 or 10.