JPH05199180A - System for cutting off laser beam - Google Patents

Abstract

PURPOSE:To provide the laser beam breaking system automatically and immediately cutting off the laser beam sent from a light transmitting terminal equipment at the occurrence of abnormality in the power supply system due to the damage of submarine cable, etc., in the photo submarine communication system having a light transmitting terminal equipment, power supply device and common device. CONSTITUTION:When the feed current or voltage to be monitored in a power supply device 50 exceeds a prescribed value, a CPU 21 of a light transmitting terminal equipment 10 stops driving of the laser diode of an A-system light transmitting device OS-A22 and B-system transmitting equipment OS-B23 by the firmware control of a CPU 61 of a common device 60. Thus, the laser light can be cutoff. The security of an inspector's body can be protected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to interruption of laser light when an accident such as damage to a power feeding system or a submarine cable in an optical undersea communication system occurs.

In recent years, optical submarine communication systems using optical fibers have been expanded all over the world, and further development of a non-repeater system using an optical direct amplification system has been promoted.
The intensity of the laser light level is increasing in the future.

Therefore, for maintenance of the optical submarine terminal equipment, it is necessary to take measures to protect the human body by accidentally exposing the laser light emitted from the optical fiber, and especially when an accident occurs, the laser light can be shut off quickly and surely. There is a strong demand for a function to do so.

[0004]

2. Description of the Related Art FIG. 4 is a diagram showing an outline of an example of a conventional optical submarine communication system, and FIG. 5 is a diagram showing an example of function allocation of respective firmware in an optical submarine terminal station of FIG. Also,
FIG. 6 is a diagram showing the functional operations and operations from the occurrence of an accident in the optical submarine terminal to the stop of laser light output when a damage accident occurs in the submarine cable of the optical submarine terminal A in FIG.

In the figure, reference numerals 1 and 2 denote optical submarine terminal stations, which are optical submarine terminal stations for connecting a submarine transmission line connected by a submarine cable and a submarine repeater to a land communication network. 10 is an optical transmission terminal device, 21, 61 and 71 are CPUs, 22 and 23 are optical transmitters (OS-A / B), and 24 and 25 are converters (MAX-).
A / B), 26 is an optical coupler, 40 is a cable terminating device,
50 is a power supply device, 60 is a common device, 70 is a system / repeater monitoring device, 80 is a submarine cable, and REP1 to REP
Reference numeral n is a submarine repeater, and 90 is a public line.

In FIG. 4, an optical submarine terminal station A 1 is an optical transmission terminal apparatus 10 for converting a low-order group signal of a land communication network into a high-speed optical signal of a submarine transmission line, and an optical transmission terminal station apparatus. 10
A cable terminating device 40 for connecting the optical fiber pair from the power feeding device 50 and the power feeding line from the power feeding device 50 to the submarine cable 80,
Transfer of monitoring / control information between the power feeding device 50 that supplies power to the submarine repeaters REP1 to REPn, the optical transmission terminal device 10, the power feeding device 50, and the system / repeater monitoring device 70, and the optical transmission terminal device 10. A common device 60 that integrally controls redundant switching control of the main transmission signal system and a public line for performing continuous monitoring data collection of the system and the submarine repeater and for exchanging information with the other optical submarine terminal B station 2 And a system / repeater monitoring device 70 connected via

The power feeding to the submarine repeaters REP1 to REPn also differs depending on the number of submarine repeaters REP1 to REPn connected between the optical submarine terminal station A 1 and the optical submarine terminal station B 2. Station 1 is + 2000V, Station B 2 is -2
Both stations are supplying power as said 000V.

The function sharing of the firmware of the optical submarine terminal A station 1 during operation will be described with reference to FIG. Normal operation is performed by the A system configured by the converter MAX-A24 and the transmitter OS-A22, and the converter MAX-B25 and the transmitter OS-B.
The B system composed of 23 is in a standby state as a non-operation,
If the system becomes an obstacle, it will be used for operation.

Regarding the deterioration monitoring of the laser diode of the optical transmitter OS-A22 of the optical transmission terminal equipment 10 as one of the system monitoring, the bias current of the laser diode of the optical transmitter OS-A22 is monitored and abnormal. Is confirmed, an LD switching control signal is issued from the common device 60,
The firmware of the CPU 21 of the optical transmission terminal device 10 drives the laser diode of the optical transmitter OS-B23 to enter the operating state, and the operation of the optical transmitter OS-A22 is stopped.

Next, regarding the monitoring of the power feeding system, when it is detected that the power feeding current / voltage monitored by the power feeding device 50 deviates from the range of a predetermined value, the common device 60 and the system / repeater monitoring device 70 are notified. The information is transmitted, the information content is displayed at a predetermined display location, and at the same time, the information is transmitted to the partner station B through the public line 90.

In the case of a power supply system accident as shown in FIG. 6, (1) if a submarine cable damage accident due to a trawler or the like occurs, (2) the power supply device 5
When the power supply current / voltage deviates from the predetermined value range at 0 and an abnormality is detected, power supply is stopped and (3),
(4) The alarm signal is transmitted to the common device 60. (5),
(6) The CPU 61 of the common device 60 performs alarm / control and display / transfer processing, and (7) and (8) further system /
It is displayed on the display device of the repeater monitoring device 70. (9)
The maintenance person confirms this display, and (10) the maintenance person turns off the power SW of the optical transmission terminal station device 10 and the optical transmitter OS-A / B2.
Pull out from the No. 2 and No. 23 devices.

The laser light output of the laser diodes of the transmitters OS-A / B 22 and 23 is cut off by the functional operation and operation as described above.

[0013]

However, when a power supply abnormality occurs due to the occurrence of such an accident in the conventional apparatus, the maintenance person shuts off the power source SW of the optical transmission terminal station device 10 or the optical transmitter OS-A / Since a manual operation such as pulling out B from the device is required, an abnormal situation may occur, and the maintenance person may lose the calmness. There was a risk of looking directly at the laser light.

An object of the present invention is to solve the above problems, and to provide a laser light blocking method for preventing the influence of the laser light on the human body due to an erroneous operation at the time of an abnormal power supply due to a damage accident of a submarine cable. To do.

[0015]

FIG. 1 shows an example of a principle configuration diagram of a laser light blocking system according to the present invention. In the figure,
The same reference numerals as those in FIGS. 4, 5 and 6 indicate the same components.

According to the present invention, an optical transmission terminal station device 10 for converting a low-order group signal of a land communication network into a high-speed optical signal of a submarine transmission line and a power feeding device 50 for supplying electric power to a submarine repeater.
And a common device 60 for exchanging monitoring / control information between the optical transmission terminal station device 10 and the power feeding device 50, and integrally performing redundant switching control of the main transmission signal system of the optical transmission terminal station device 10.
In a laser light blocking system for an optical submarine terminal station having a CPU 61 of the common device 60 and the optical transmission terminal device 10
A function is added to the firmware control algorithm with the CPU 21 so as to operate even when a power supply abnormality occurs.

Then, when the power supply device 50 detects that the power supply current or the power supply voltage is out of the specified value, the CPU 61 of the common device 60 controls the optical transmission terminal station device 10 to operate. The CPU 21 operates to block the laser light of the laser diode of the optical transmitter OS-A / B 22, 23.

[0018]

The present invention detects that the power supply current or the power supply voltage monitored by the power supply device 50 is out of the specified value, and when this accident information is sent to the common device 60, the firmware of the CPU 61 of the common device 60 is activated. It is determined that the power supply is abnormal, and a control signal is sent to the optical transmission terminal station device 10 so as to stop the optical output of the transmitters of both the operating system and the non-operating system.

Upon receiving the control signal, the firmware of the CPU 21 of the optical transmission terminal device 10 is the transmitter OS-
By sending a control signal to the A / Bs 22 and 23 to stop the driving of the laser diodes, the optical transmitters OS-A / B 22 and 23 stop the driving of the laser diodes. You can turn it off.

[0020]

EXAMPLES Next, examples will be described with reference to FIGS. FIG. 2 is a diagram showing an embodiment of a laser light blocking system of an optical submarine terminal station according to the present invention, and FIG. 3 is a flowchart of firmware of a common device for optical submarine terminal station and an optical transmission terminal station device according to the present invention. It is a figure which shows the outline | summary. In the figure, the same reference numerals as those in FIGS. 1, 4, 5, and 6 indicate the same components.

The firmware algorithm of the common device 60 and the optical transmission terminal device 10 in the normal operating state is the same as the conventional one because the power feeding system is normal, but the firmware when the power feeding system accident occurs The above algorithm is a flow chart to which the flow indicated by the bold line in FIG. 3 is added.

To explain the outline with reference to FIG. 3, in the firmware of the common device 60, after the initial setting when the power is turned on, the optical transmission terminal station device 10, the power feeding device 50,
From within the system / repeater monitoring device 70 and own device 60,
Collect current information on monitoring items such as alarm occurrence status, power supply current / power supply voltage, operation status of main transmission system, and make a comprehensive judgment. The result is displayed on the display of the own device 60 and is transmitted to the system / repeater monitoring device 70.

Here, as in the conventional case, the optical transmission terminal station device 1
If there is information indicating that the optical output is 0 from 0, the LD switching control signal from the LD of A system to the LD of B system is sent to the optical transmission terminal device 10.

In the present invention, the CPU 61 of the common device 60 and the CPU 21 of the optical transmission terminal station device 10 are improved so as to deal with the power supply abnormality. Therefore, if the power supply abnormality is determined, the optical transmission terminal station is determined. The control signal to be sent to the device 10 is an instruction for disconnecting the LDs of both the operating system and the non-operating system,
In addition to sending the LD both-system disconnection signal, it displays the alarm information and the current value of the monitoring item etc. on the display of its own device, and also sends the alarm / monitoring information to the system / repeater monitoring device 70.

On the other hand, in the firmware of the optical transmission terminal device 10, after the initial setting when the power is turned on, the alarm generation status in the own device 10 and the status of the main transmission system are
It constantly grasps the common device 60 based on the result of comprehensive judgment.
In response to this, information regarding the alarm occurrence status within the self-device 10 and the status of the main transmission system is transmitted.

If a light output interruption occurs, the common device 6
The optical output interruption information is sent to 0, but the LD switching control signal from the common device 60 to the LD switching control signal from the A-system LD to the B-system LD is sent to the transmitter 60 based on the signal. A drive start command is sent to the OS-B23, and a drive stop command is sent to the transmitter OS-A22.

Here, when the optical transmission terminal device 10 is in a normal operation state, the common device 60 causes L
Upon receiving the both-D system disconnection command, the LD drive stop signal is sent to the operating / non-operating transmitters OS-A / B 22, 23 of the own device 10.

As described above, in the present invention, the algorithm of the firmware of the CPUs 61 and 21 of the common device 60 and the optical transmission terminal device 10 is improved so that it can cope with the occurrence of an abnormality in the power feeding system. FIG. 2 illustrates an example in which a submarine cable damage accident occurs.
The parentheses below correspond to the parentheses in FIG. (1) It is assumed that the submarine cable 80 is externally damaged and the power supply line is disconnected. (2), (3) In the power supply device 50, a power supply current interruption and a power supply voltage abnormality are detected, and this alarm signal is sent to the common device 6
Sent to 0. (4) The interface unit of the common device 60 with the power supply device 50 receives this alarm signal, and the common device 60
Microprocessor (CPU) 61, which is the heart of
Sent to. (5) Microprocessor part of common device 60 (CP
In U) 61, in addition to the conventional alarm processing and display / transfer processing, the lasers of the optical transmitters (OS-A / B) 21 and 22 of the optical transmitters 20 of the optical transmission terminal device 10 are transmitted. An LD disconnection control signal for stopping the driving of the diode is sent. (6) An LD disconnection control signal is sent to the optical transmission terminal device 10 from the interface section with the optical transmission terminal device 10.

Further, to the system / repeater monitoring device 70, a power supply current interruption alarm signal is sent from the interface section with the system / repeater monitoring device 70. (7) to (9) The LD disconnection control signal received by the interface unit of the optical transmission terminal station device 10 is
In the microprocessor unit (CPU) 21 of
A stop control signal for the laser diode drive circuits of the optical transmitters 21 and 22 of each system / B system is transmitted. By the stop control signal of the laser diode drive circuit, the laser diode drive circuits of the optical transmitters 21 and 22 stop operating, and the laser light is stopped from being sent.

The alarm signal received by the interface section of the system / repeater monitoring device 70 is
The microprocessor unit (CP of the repeater monitoring device 70)
U) 71 displays an alarm on the display unit 72.

Although not shown, the abnormal phenomenon of the power feeding system due to the occurrence of such an accident is detected by the power feeding device 50 also in the optical submarine terminal station B 2, so that the same functional operation as the station A 1 is performed. , The laser light of the laser diode transmitted from the B station 2 is blocked.

[0032]

As described above, according to the present invention,
The hardware configuration is the same as the conventional optical submarine communication system. Simply by changing the control algorithm of the firmware (CPU) installed in the optical transmission terminal equipment and the common equipment, if a power supply abnormality occurs, it will automatically Moreover, since the laser light of the optical transmitter of the optical transmission terminal device can be blocked immediately, it is possible to easily and inexpensively secure the human body safety protection.

[Brief description of drawings]

FIG. 1 is a principle configuration diagram of a laser light blocking system of an optical submarine terminal station according to the present invention.

FIG. 2 is an embodiment of a laser light blocking system of an optical submarine terminal station according to the present invention.

FIG. 3 is a diagram showing an outline of a flowchart of firmware of a common device for an optical submarine terminal station and an optical transmission terminal device according to the present invention.

FIG. 4 is a diagram showing an outline of an example of a conventional optical submarine communication system.

FIG. 5 is a diagram showing an example of function sharing of each firmware in a conventional optical submarine terminal station.

FIG. 6 is a diagram showing functional operations and operations from the occurrence of an accident at a conventional optical submarine terminal to the stop of laser light output.

[Explanation of symbols]

 1, optical submarine terminal station A station, optical submarine terminal station B station 10 optical transmission terminal station device 21, 61, 71 CPU 22, 23 optical transmitter (OS-A, OS-B) 24, 25 converter (MAX -A, MAX-B) 26 Optical coupler 27 CH section 40 Cable terminating device 50 Power supply device 60 Common device 70 System / repeater monitoring device 72 Display section 80 Submarine cable 90 Public line REP1, REPn Optical submarine repeater

Claims (1)

[Claims] 1. An optical transmission terminal station device (1) for converting a low-order group signal of a land communication network into a high-speed optical signal of a submarine transmission line.
0) and a power supply device (50) for supplying power to the submarine repeater
And transmitting / receiving monitoring / control information between the optical transmission terminal device (10) and the power feeding device (50) to integrally control redundant switching of the main transmission signal system of the optical transmission terminal device (10). In a laser light blocking system of an optical submarine terminal station having a common device (60), firmware control of a CPU (61) of the common device (60) and a CPU (21) of the optical transmission terminal device (10) A function is added to the algorithm so as to deal with a power supply abnormality, and when the power supply device (50) detects that the power supply current or the power supply voltage is out of a specified value, the common device (60) Under the control of the CPU (61), the CPU (21) of the optical transmission terminal device (10) operates,
A laser light blocking method characterized in that the laser light of the laser diode of the optical transmitter OS-A / B (21, 22) is blocked.