JP2001024589A - Optical communication monitor system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To monitor deterioration over aging of optical parts within an optical-to- electrical transducer or an electrical-to-optical transducer for maintenance and to improve the reliability of a system by providing a redundant monitor control part automatically becoming a monitor control part to operate when a fault occurs in either opto-to-electrical transducer or electrical-to-optical transducer. SOLUTION: A first redundant monitoring control part 6 monitors the optical-to- electrical transducer and the electrical-to-optical transducer of a first monitor control part 1 and when a fault occurs in either the optical-to-electrical transducer or the electrical-to-optical transducer, and it automatically becomes a monitoring control part to operate. A second redundant monitoring control part 7 monitors the optical-to- electrical transducer and the transducer of a second monitoring control part 2, and when a fault occurs in either the optical-to-electrical transducer or the electrical-to- optical transducer, and it automatically becomes a monitoring control part to operate. The redundant monitoring control circuits of the parts 6 and 7 execute monitoring of the state of a main signal, the level control of the main signal, controlling of a repeating station 52, etc., based on an electric-monitor signal transduced by the optical- to-electrical transducer.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical communication monitoring system in which a monitoring controller for monitoring and controlling a main signal has a redundant configuration.

[0002]

2. Description of the Related Art FIG. 9 is an explanatory view schematically showing a conventional optical communication monitoring system. As shown in FIG. 9, a conventional optical communication monitoring system includes one terminal 50 and the other terminal 5.
1 and one or more (three in FIG. 9) relay stations 52 installed between these terminal stations, and are provided bidirectionally between one terminal station 50 and the other terminal station 51. Optical transmission path 53 in one direction and optical transmission path 54 in the other direction which is opposite to the one direction.
Then, an optical signal obtained by multiplexing the main signal and the monitoring signal is transmitted.
The monitor signal has a wavelength different from the wavelength of the main signal, and performs monitoring of the state of the main signal, level control of the main signal, control of the relay station 52, and the like.

One terminal 50 has a one-way optical transmission line 53.
For example, a first main signal optical receiver 55 (O) converts an optical main signal received from an external device (not shown) into an electric main signal.
/ E), a first main signal light transmitter 56 (TX) that converts the electric main signal converted by the first main signal light receiver 55 into an optical main signal and transmits the signal, and a first main signal A first optical amplifier 57 that amplifies the main signal output from the optical transmitter 56, a first supervisory signal transmitter 58 (SV) that transmits a supervisory signal,
It has a first coupler 59 that combines the main signal amplified by the first optical amplifier 57 and the monitoring signal. Further, one terminal station 50 is split into a second coupler 60 for the optical transmission line 54 in the other direction, which splits the signal received from the relay station 52 at the preceding stage into a main signal and a monitoring signal. A first monitoring signal receiver 61 (SV) for receiving a monitoring signal, and a second optical amplifier 6 for amplifying the split main signal and transmitting the amplified main signal to an external device
And 2.

Each of the relay stations 52 is a third coupler for a one-way optical transmission line 53, which splits an optical signal received from one of the terminal stations 50 or the preceding relay station 52 into a main signal and a monitor signal. 63, a first monitoring controller 6 that receives the split monitoring signal, performs monitoring control of the main signal, and transmits the monitoring signal.
4 (SV), a third optical amplifier 65 that amplifies the separated main signal, and a main signal amplified by the third optical amplifier 65 and the monitoring signal to be combined and the other terminal station 51 or A fourth coupler 66 for transmitting to the relay station 52 at the subsequent stage. Also,
Each of the relay stations 52 includes a fifth coupler 67 for splitting the optical signal received from the other terminal station 51 or the preceding relay station 52 into a main signal and a monitoring signal for the optical transmission path 54 in the other direction,
A second monitoring controller 68 (SV) that receives the split monitoring signal, performs monitoring control of the main signal, and transmits the monitoring signal.
And a fourth optical amplifier 69 for amplifying the split main signal.
And a sixth coupler 70 for multiplexing the main signal and the monitor signal amplified by the fourth optical amplifier 69 and transmitting the multiplexed signal to one of the terminal stations 50 or the subsequent relay station 52.

[0005] The other terminal station 51 has a one-way optical transmission line 53.
For use, a seventh coupler 71 for splitting an optical signal received from the preceding relay station 52 into a main signal and a monitor signal, and a second monitor signal receiver 72 for receiving the split monitor signal
(SV), and a fifth optical amplifier 73 that amplifies the split main signal and transmits the amplified main signal to an external device. Also, the other terminal station 51 uses a second main signal optical receiver 74 (O) for converting an optical main signal received from an external device (not shown) into an electric main signal for the optical transmission line 54 in the other direction. / E) and a second main signal light transmitter 75 (TX) that converts the electric main signal converted by the second main signal light receiver 74 into an optical main signal and transmits the signal.
A sixth optical amplifier 76 for amplifying the main signal output from the second main signal light transmitter 75, a second monitor signal transmitter 77 (SV) for transmitting the monitor signal, and a sixth light Amplifier 7
And an eighth coupler 78 for multiplexing the main signal amplified in step 6 with the monitor signal.

The optical signal transmitted from the first main signal light transmitter 56 is amplified by the first optical amplifier 57 and transmitted to the subsequent relay station 52 via the one-way optical transmission line 53.
In the relay station 52, the main signal attenuated in the one-way optical transmission line 53 is amplified by the third optical amplifier 65, and
2 is transmitted. The main signal is transmitted to the other terminal station 51 after passing through the relay station 52. In the other terminal station 51, the fifth terminal
, And is transmitted to an external device. The main signal from the other terminal station 51 to one terminal station 50 is
The light is transmitted in the same manner as described above via the optical transmission line 54 in the other direction.

The supervisory signal transmitted from the first supervisory signal transmitter 58 of one terminal station 50 is transmitted to the first coupler 5.
9, after being multiplexed with the main signal, a one-way optical transmission path 53
Is transmitted to the relay station 52 at the subsequent stage. In the relay station 52, the main signal and the monitoring signal are split by the third coupler 63, and the first monitoring controller 64 receives and monitors the split monitoring signal, and includes information on the relay station 52. Send a monitoring signal. The monitoring signal is transmitted to the third coupler 66 by the fourth coupler 66.
And is transmitted to the relay station 52 at the subsequent stage. The monitoring signal is transmitted to the other terminal station 51 after passing through the relay station 52. At the other terminal station 51, the optical signal is split into a main signal and a monitor signal by the seventh coupler 71, and the second monitor signal receiver 72 receives the monitor signal including the information of each relay station 52. The monitoring signal from the other terminal station 51 to one terminal station 50 is transmitted via the optical transmission line 54 in the other direction in the same manner as described above.

However, in the conventional optical communication monitoring system,
For example, the first monitoring controller 64 (FIG. 9) of the relay station 52 in the middle stage
(Indicated by x), transmission and reception of the monitoring signal, monitoring and control of the main signal become impossible.

Therefore, in order to improve the reliability of the system, an optical communication monitoring system having a redundant configuration by installing monitoring devices for the active system and the standby system is disclosed in, for example, Japanese Patent Publication No. 6-3046.
No. 7 proposes this. Figure 10 shows the Japanese Patent Publication No. 6-30
1 is an explanatory diagram illustrating an optical loop monitoring device proposed in Japanese Patent Application Publication No. 467.

As shown in FIG. 10, a conventional optical loop monitoring device comprises working and standby optical transmission lines 80-0, 80-.
1 and a plurality of nodes 81 (MX) inserted into the optical transmission lines 80-0 and 80-1 for monitoring an optical loop. The monitoring unit 82-0 of the active system and the standby system Monitoring units 82-1 and each monitoring unit 82-1
0, 82-1 is detected, and when a failure occurs, the monitoring unit 82-0 of the active system switches to the monitoring unit 8 of the standby system.
Network monitoring processor 8 for performing system switching to 2-1
3 (NSP) and a single photoelectric conversion unit 84 shared by the monitoring units 82-0 and 82-1.

Each of the monitoring units 82-0 and 82-1 is composed of demultiplexing units CC0 and CC1 and control units PC0 and PC1.

The photoelectric converter 84 includes a photoelectric converter 85,
86 (O / E) and electro-optical converters 87 and 88 (E / O).
0, 80-1.

The network monitoring processor 83 polls each of the monitoring units 82-0 and 82-1 and determines normal / abnormal based on the response.

Each monitoring unit 82-0, 82-1
The switches 89 and 90 are provided so that the photoelectric conversion unit 84 can be selectively used, and either the working system or the standby system is selected under the control of the network monitoring processor 83.

[0015]

In the conventional optical loop monitoring device, the multiplexing / demultiplexing unit CC and the control unit PC have a redundant configuration, but the photoelectric conversion units 85 and 86 of the photoelectric conversion unit 84 and the electrical The optical converters 87 and 88 do not have a redundant configuration. Therefore, the demultiplexing unit CC and the control unit P
Although the failure of C can be dealt with, the failure of the photoelectric converters 85 and 86 and the photoelectric converters 87 and 88 of the photoelectric converter 84, which has a high possibility of failure, cannot be dealt with. Low reliability.

Further, no measures are taken against the aging of the optical components in the photoelectric converters 85 and 86 and the electro-optical converters 87 and 88.

Further, the network monitoring processor 83 is controlled by the control units PC0 and PC1 in order to detect the presence or absence of a failure in the active and standby monitoring units 82-0 and 82-1.
, The configuration is complicated.

FIG. 6 of Japanese Patent Publication No. Hei 6-30467 is disclosed.
Discloses an example in which the optical-electrical converter and the electro-optical converter are configured in a redundant configuration. However, even if a failure occurs in the active monitoring unit, the transmission data is configured to pass. (See page 32, right column, lines 32-34)
Failure to prevent transmission data from passing is not possible.

Further, the above publication does not disclose any bidirectional optical communication monitoring system, and has no description suggesting it.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and can cope with a failure of an optical-electrical converter or an electro-optical converter. It is an object of the present invention to provide an optical communication monitoring system that can monitor and maintain aging of optical components in a container and has a simple configuration.

[0021]

A first optical communication monitoring system according to the present invention includes an opto-electrical converter and an electro-optical converter.
In an optical communication monitoring system having a monitoring control unit for transmitting and receiving a monitoring signal transmitted to an optical transmission line and monitoring and controlling a main signal, the monitoring unit monitors at least the photoelectric converter and the electro-optical converter of the monitoring control unit. And a redundant supervisory control unit that operates as a supervisory control unit when at least one of the opto-electrical converter and the electro-optical converter fails.

A second optical communication monitoring system according to the present invention includes an optical-electrical converter and an electro-optical converter, and transmits and receives a monitoring signal transmitted through a one-way optical transmission line to monitor and control a main signal. A second monitoring and control unit that includes a first monitoring and control unit that performs the monitoring and a main signal by transmitting and receiving a monitoring signal transmitted to the optical transmission line in the other direction, including a photoelectric converter and an electro-optical converter. A monitoring unit that monitors at least the opto-electrical converter and the electro-optical converter of the first monitoring control unit, and causes a failure in at least one of the opto-electrical converter and the electro-optical converter. Is generated, the device itself operates as a monitoring control unit, and monitors at least the photoelectric converter and the electro-optical converter of the second monitoring control unit. At least one of them has failed Case, has a redundant monitoring control unit which operates a own monitoring control unit, and is characterized in that.

A third optical communication monitoring system according to the present invention includes an optical-electrical converter and an electro-optical converter, and transmits and receives a monitoring signal transmitted through a one-way optical transmission line to monitor and control a main signal. A monitoring control unit that transmits and receives a monitoring signal transmitted to the optical transmission line in the other direction and monitors and controls the main signal, and monitors at least the photoelectric converter and the electro-optical converter of the monitoring control unit. A redundant supervisory control unit that operates as a supervisory control unit when a failure occurs in at least one of the photoelectric converter and the electro-optical converter; and the supervisory control unit and the redundant supervisory control unit. And switching means for switching the direction of transmission and reception of the monitoring signal at predetermined time intervals.

[0024]

Embodiments of the present invention will be described below with reference to the drawings. The same members as those constituting the conventional optical communication monitoring system (see FIG. 9) will be described with the same reference numerals. FIG. 1 is an explanatory diagram for explaining an operation of the optical communication monitoring system according to the first embodiment of the present invention in a normal state, FIG. 2A is a block diagram illustrating a configuration of a monitoring control unit, and FIG. 3) is a block diagram showing the configuration of the redundant supervisory control unit, and FIG.
It is an explanatory view for explaining operation of an optical communication monitoring system concerning an embodiment.

As shown in FIG. 1, a relay station 52 according to the first embodiment of the present invention transmits and receives a monitoring signal transmitted to a one-way optical transmission line 53 to monitor and control a main signal. The first monitoring control unit 1 performs monitoring and control of a main signal by transmitting and receiving a monitoring signal transmitted to the optical transmission line 54 in the other direction.
And a monitoring control unit 2.

As shown in FIG. 2A, the first monitoring control unit 1 and the second monitoring control unit 2 receive an optical monitoring signal and convert it into an electrical monitoring signal. O / E)
A monitoring control circuit 4 for monitoring the state of the main signal, controlling the level of the main signal, controlling the relay station 52, and the like based on the converted electric monitoring signal, and an electric monitoring signal output from the monitoring control circuit 4. To an optical monitoring signal.
/ O).

The optical communication monitoring system of the present invention also monitors at least the opto-electric converter 3 and the electro-optical converter 5 of the first monitoring and control unit 1 and at least the opto-electric converter 3 and the electro-optical converter 5. When one of the failures occurs, the first redundant supervisory control unit 6 that operates as a supervisory control unit by itself.
And monitoring at least the opto-electric converter 3 and the electro-optical converter 5 of the second monitoring control unit 2 and, when a failure occurs in at least one of the opto-electric converter 3 and the electro-optical converter 5, And a second redundant supervisory control unit 7 which operates as a supervisory control unit by itself.

As shown in FIG. 2B, the first redundant supervisory control unit 6 and the second redundant supervisory control unit 7 receive an optical supervisory signal and convert it into an electrical supervisory signal. Converter 3
(O / E), based on the converted electrical monitoring signal, a redundant monitoring control circuit 8 for monitoring the state of the main signal, controlling the level of the main signal, controlling the relay station 52, and the like; And an electro-optical converter 5 (E / O) for converting an electrical monitoring signal output from the circuit 8 into an optical monitoring signal. Also, the first
The redundant supervisory control circuit 8 of the redundant supervisory control unit 6
The monitoring control unit 1 monitors at least the failure of the photoelectric converter 3 and the photoelectric converter 5 such as failure or aging. Second
The redundant supervisory control circuit 8 of the redundant supervisory control unit 7
The monitoring control unit 2 monitors at least the failure of the photoelectric converter 3 and the photoelectric converter 5 such as failure or aging.

A first optical switch 9 for switching the transmission direction of the supervisory signal is provided between the first supervisory controller 1 and the first supervisory supervisory controller 6 and the third coupler 63. ing. The terminal a of the first optical switch 9 is connected to the third coupler 63, and the terminal b is connected to the first monitoring control unit 1
And its terminal c is connected to the first redundant supervisory control unit 6.

A second optical switch 10 for switching the transmission direction of the supervisory signal is provided between the first supervisory controller 1 and the first supervisory supervisory controller 6 and the fourth coupler 66. ing. The terminal a of the second optical switch 10 is connected to the fourth coupler 66, the terminal b is connected to the first monitoring control unit 1, and the terminal c is connected to the first redundant monitoring control unit 6. ing.

A third optical switch 11 for switching the transmission direction of the supervisory signal is provided between the second supervisory controller 2 and the second supervisory supervisory controller 7 and the fifth coupler 67. ing. The terminal a of the third optical switch 11 is connected to the fifth coupler 67, the terminal b is connected to the second supervisory control unit 2, and the terminal c is connected to the second redundant supervisory control unit 7. ing.

A fourth optical switch 12 for switching the transmission direction of the supervisory signal is provided between the second supervisory controller 2 and the second supervisory supervisory controller 7 and the sixth coupler 70. ing. The terminal a of the fourth optical switch 12 is connected to the sixth coupler 70, the terminal b is connected to the second supervisory control unit 2, and the terminal c is connected to the second redundant supervisory control unit 7. ing.

Next, the operation of the first embodiment of the present invention will be described. Normally, the first optical switch 9 is connected to the terminal a
Is output to the terminal b, and the second optical switch 10 outputs the monitoring signal input to the terminal b to the terminal a. Therefore, as shown by the bold line in FIG. 1, the monitoring signal split by the third coupler 63 passes through the first optical switch 9, and the first monitoring control unit 1 monitors and controls the main signal. Thereafter, the signal passes through the second optical switch 10 and is multiplexed with the main signal by the fourth coupler 66 and transmitted to the relay station 52 or the other terminal station 51 at the subsequent stage.

The first redundant supervisory control unit 6 monitors the first supervisory control unit 1, and when a failure occurs in the first supervisory control unit 1, sends an alarm signal to the first optical supervisory control unit 1. Switch 9
And to the second optical switch 10. As a result, as shown in FIG. 3, the first optical switch 9 outputs the monitoring signal input to the terminal a to the terminal c, and the second optical switch 10 outputs the monitoring signal input to the terminal c to the terminal c. a. Therefore, as shown by the bold line in FIG. 3, the monitoring signal split by the third coupler 63 passes through the first optical switch 9 and the first redundant monitoring control unit 6 controls the monitoring of the main signal. After that, the signal passes through the second optical switch 10, is multiplexed with the main signal by the fourth coupler 66, and is transmitted to the subsequent relay station 52 or the other terminal station 51.

On the other hand, for the optical transmission line 54 in the other direction,
In a normal state, the third optical switch 11 causes the monitoring signal input to the terminal a to be output to the terminal b, and the fourth optical switch 1
2 causes the monitoring signal input to the terminal b to be output to the terminal a. Therefore, as shown by the bold line in FIG. 1, the monitor signal split by the fifth coupler 67 passes through the third optical switch 11, and the main signal is monitored and controlled by the second monitor controller 2. After passing through the fourth optical switch 12, the sixth coupler 7
At 0, the signal is multiplexed with the main signal and transmitted to the relay station 52 or one terminal station 50 at the subsequent stage.

The second redundant supervisory control unit 7 monitors the second supervisory control unit 2, and when a failure occurs in the second supervisory control unit 2, outputs an alarm signal to the third optical control unit 2. Switch 1
The signal is transmitted to the first and fourth optical switches 12. Thereby, as shown in FIG. 3, the third optical switch 11 outputs the monitoring signal input to the terminal a to the terminal c, and the fourth optical switch 12 outputs the monitoring signal input to the terminal c. Terminal a
Output. Therefore, as shown by the bold line in FIG.
The supervisory signal split by the coupler 67 passes through the third optical switch 11, and after the main signal is monitored and controlled by the second redundant supervisory control unit 7, passes through the fourth optical switch 12. ,
The sixth signal is multiplexed with the main signal by the sixth coupler 70 and transmitted to the relay station 52 or one terminal station 50 at the subsequent stage.

According to the first embodiment, the opto-electric converters 3 and the electro-optical converters 5 of the first monitoring control unit 1 and the second monitoring control unit 2 have a redundant configuration. The failure of the electric converter 3 or the electro-optical converter 5 can be dealt with, and the reliability of the system can be improved.

Further, it is possible to monitor and maintain the aging of the optical components in the photoelectric converter 3 and the electro-optical converter 5.

Further, the first and second redundant supervisory control units 6 and 7 monitor the first and second supervisory control units 1 and 2 respectively, and when a failure occurs, they themselves become supervisory control units. In this case, there is no need to provide a separate network monitoring processor as in the prior art, and the configuration of the system is simplified.

FIG. 4 is an explanatory diagram for explaining the operation of the optical communication monitoring system according to the second embodiment of the present invention in a normal state, and FIG. 5 is a diagram illustrating the operation when a failure occurs in the first monitoring control unit. FIG. 6 is an explanatory diagram for explaining the operation of the optical communication monitoring system according to the second embodiment of the present invention. FIG. 6 shows the second embodiment of the present invention when a failure occurs in the second monitoring control unit. It is an explanatory view for explaining operation of such an optical communication monitoring system.

In the second embodiment, at least the opto-electric converter 3 and the electro-optical converter 5 of the first monitoring control unit 1 are monitored, and at least one of the opto-electric converter 3 and the electro-optical converter 5 is monitored. If one of the faults occurs, it operates as a monitoring control unit by itself, monitors at least the photoelectric converter 3 and the electro-optical converter 5 of the second monitoring control unit 2, When a failure occurs in at least one of the electro-optical converters 5, a redundant supervisory control unit 13 that operates as a supervisory control unit by itself is provided.

The first monitoring control unit 1 and the third coupler 63
, A fifth optical switch 15 is provided between the first supervisory control unit 1 and the fourth coupler 66, and a second optical switch 15 is provided between the first supervisory control unit 1 and the fourth coupler 66. A seventh optical switch 16 is provided between the second monitoring controller 2 and the sixth coupler 70, and an eighth optical switch 17 is provided between the second monitoring controller 2 and the sixth coupler 70. . A ninth optical switch 18 is provided between the fifth optical switch 14, the seventh optical switch 16, and the redundant supervisory control unit 13,
A tenth optical switch 19 is provided between the optical switch 15, the eighth optical switch 17, and the redundant supervisory control unit 13.

The terminal a of the fifth optical switch 14 is connected to the third coupler 63, the terminal b is connected to the first monitoring and control unit 1, and the terminal c is connected to the terminal a of the ninth optical switch 18. It is connected to the.

The terminal a of the sixth optical switch 15 is connected to the fourth coupler 66, the terminal b is connected to the first monitoring and control unit 1, and the terminal c is the terminal c of the tenth optical switch 19. It is connected to the.

The terminal "a" of the seventh optical switch 16 is connected to the fifth coupler 67, the terminal "b" is connected to the second monitoring controller 2, and the terminal "c" is connected to the terminal "b" of the ninth optical switch 18. It is connected to the.

The terminal a of the eighth optical switch 17 is connected to the sixth coupler 70, the terminal b is connected to the second monitoring control unit 2, and the terminal c is connected to the terminal b of the tenth optical switch 19. It is connected to the.

The terminal c of the ninth optical switch 18 and the tenth
The terminal a of the optical switch 19 is connected to the redundant supervisory controller 13.

Next, the operation of the second embodiment of the present invention will be described. In a normal state, as shown in FIG. 4, the fifth optical switch 14 outputs the monitoring signal input to the terminal a to the terminal b, and the sixth optical switch 15 outputs the monitoring signal input to the terminal b. Is output to the terminal a. Therefore, as shown by the bold line in FIG. 4, the monitoring signal split by the third coupler 63 passes through the fifth optical switch 14, and the first monitoring controller 1 monitors and controls the main signal. Thereafter, the signal passes through the sixth optical switch 15 and is multiplexed with the main signal by the fourth coupler 66 and transmitted to the relay station 52 or the other terminal station 51 at the subsequent stage.

The redundant supervisory control unit 13 monitors the first supervisory control unit 1. If a failure occurs in the first supervisory control unit 1, the redundant supervisory control unit 13 outputs an alarm signal to the fifth optical switch 14.
The sixth optical switch 15, the ninth optical switch 18, and the first
0 to the optical switch 19. As a result, as shown in FIG. 5, the fifth optical switch 14 outputs the monitoring signal input to the terminal a to the terminal c, and the sixth optical switch 15
Causes the monitoring signal input to the terminal c to be output to the terminal a. The ninth optical switch 18 causes the monitoring signal input to the terminal a to be output to the terminal c, and the tenth optical switch 1
9 causes the monitoring signal input to the terminal a to be output to the terminal c. Therefore, as shown by the thick line in FIG. 5, the monitoring signal split by the third coupler 63 is the fifth optical switch 14,
After the main signal is monitored and controlled by the redundant supervisory controller 13 through the ninth optical switch 18, the tenth optical switch 1
9, through the sixth optical switch 15 and through the fourth coupler 66
The signal is multiplexed with the main signal and transmitted to the relay station 52 or the other terminal station 51 at the subsequent stage.

On the other hand, for the optical transmission line 54 in the other direction,
Normally, as shown in FIG.
Outputs the monitoring signal input to the terminal a to the terminal b,
The eighth optical switch 17 outputs the monitoring signal input to the terminal b to the terminal a. Therefore, the monitoring signal split by the fifth coupler 67 passes through the seventh optical switch 16 and
After the main signal is monitored and controlled by the second monitoring controller 2,
The signal passes through the eighth optical switch 17, is multiplexed with the main signal by the sixth coupler 70, and is connected to the subsequent relay station 52 or one terminal station 5
Sent to 0.

The redundant supervisory control unit 13 monitors the second supervisory control unit 2. If a failure occurs in the second supervisory control unit 2, the redundant supervisory control unit 13 sends an alarm signal to the seventh optical switch 16.
The eighth optical switch 17, the ninth optical switch 18, and the first
0 to the optical switch 19. As a result, as shown in FIG. 6, the seventh optical switch 16 outputs the monitoring signal input to the terminal a to the terminal c, and the eighth optical switch 17
Causes the monitoring signal input to the terminal c to be output to the terminal a. The ninth optical switch 18 outputs the monitoring signal input to the terminal b to the terminal c,
9 causes the monitoring signal input to the terminal a to be output to the terminal b. Therefore, as shown by the thick line in FIG. 6, the monitoring signal split by the fifth coupler 67 is the seventh optical switch 16,
After the main signal is monitored and controlled by the redundant supervisory controller 13 through the ninth optical switch 18, the tenth optical switch 1
9, through the eighth optical switch 17, and through the sixth coupler 70
The signal is multiplexed with the main signal and transmitted to the relay station 52 or one terminal station 50 at the subsequent stage.

According to the second embodiment, the single supervisory control unit 13 monitors the first supervisory control unit 1 and the second supervisory control unit 2. The number of redundant supervisory control units can be reduced, and the configuration becomes simpler. If there is no problem in the loss between transmissions, a coupler may be used instead of the fifth optical switch 14 and the seventh optical switch 16. In this case, the redundant supervisory control unit 13
It is necessary that the redundant supervisory control circuit 8 does not output light from the electro-optical converter 5.

FIG. 7 is an explanatory diagram for explaining the operation of the optical communication monitoring system according to the third embodiment of the present invention in a normal state, and FIGS. It is an explanatory view for explaining switching of the optical switch of the optical communication monitoring system according to the third embodiment.

As shown in FIG. 7, in the third embodiment, a supervisory signal transmitted / received to the one-way optical transmission line 53 is transmitted / received to monitor / control the main signal and to transmit / receive the optical signal in the other direction. A monitoring control unit 20 for transmitting and receiving a monitoring signal transmitted to the path 54 to monitor and control the main signal; and monitoring at least the opto-electric converter 3 and the electro-optical converter 5 of the monitoring control unit 20 to perform opto-electric conversion. And a redundant supervisory control unit 21 that operates as a supervisory control unit when a failure occurs in at least one of the device 3 and the electro-optical converter 5.

The monitoring control unit 20 and the redundant monitoring control unit 21
An eleventh optical switch 22 is provided between the third coupler 63 and the fifth coupler 67, and
The twelfth optical switch 23 is provided between the redundant monitoring controller 21 and the fourth coupler 66 and the sixth coupler 70.

The terminal a of the eleventh optical switch 22 is connected to the third coupler 63, and the terminal b thereof is connected to the monitoring control unit 20.
The terminal c is connected to the redundant supervisory controller 21, and the terminal d is connected to the fifth coupler 67.

The terminal a of the twelfth optical switch 23 is connected to the fourth coupler 66, and the terminal b is connected to the monitoring control unit 20.
The terminal c is connected to the redundant supervisory control unit 21, and the terminal d is connected to the sixth coupler 70.

In the third embodiment, a timer 24 for measuring time is provided. The timer 24 switches the monitoring signal transmission / reception direction from one direction to the other direction and from the other direction to one direction at predetermined time intervals. Then, a switching signal is transmitted to the eleventh optical switch 22 and the twelfth optical switch 23.

Next, the operation of the third embodiment of the present invention will be described. Normally, as shown in FIG. 7, the eleventh optical switch 22 outputs the monitoring signal input to the terminal a to the terminal b.
And the twelfth optical switch 23 outputs the monitoring signal input to the terminal b to the terminal a. Therefore, as shown by the bold line in FIG. 7, the monitoring signal split by the third coupler 63 passes through the eleventh optical switch 22, and after the monitoring control of the main signal is performed by the monitoring control unit 20, The signal passes through the twelfth optical switch 23, is multiplexed with the main signal by the fourth coupler 66, and is transmitted to the subsequent relay station 52 or the other terminal station 51.

The switching signal from the timer 24 is the eleventh
When transmitted to the optical switch 22 and the twelfth optical switch 23, the eleventh optical switch 22 is received as shown in FIG. 8A in order to receive a monitoring signal from the optical transmission line 54 in the other direction. Causes the monitoring signal input to the terminal d to be output to the terminal b, and the twelfth optical switch 23 outputs the monitoring signal input to the terminal b to the terminal d. Therefore, as shown by the bold line in FIG. 8A, the monitor signal split by the fifth coupler 67 passes through the eleventh optical switch 22, and the monitor control of the main signal is performed by the monitor controller 20. After that, the signal passes through the twelfth optical switch 23, is multiplexed with the main signal by the sixth coupler 70, and transmitted to the relay station 52 or one terminal station 50 at the subsequent stage.

The redundant supervisory control unit 21
Is monitored, and when a failure occurs in the monitoring control unit 20, the alarm signal is output to the eleventh optical switch 22 and the first optical switch 22.
2 to the optical switch 23. As a result, FIG.
As shown in (B), the eleventh optical switch 22 outputs the monitoring signal input to the terminal a to the terminal c, and the twelfth optical switch 23 outputs the monitoring signal input to the terminal c to the terminal a. Output. Therefore, as shown by the thick line in FIG. 8B, the monitor signal split by the third coupler 63 is the first monitor signal.
After the main signal is monitored and controlled by the redundant supervisory control unit 21 through the first optical switch 22, the twelfth optical switch 23
The signal is multiplexed with the main signal by the fourth coupler 66 and transmitted to the relay station 52 or the other terminal station 51 at the subsequent stage.

FIG. 8C shows a case where a failure occurs in the monitoring control unit 20 and a switching signal from the timer 24 is transmitted to the eleventh optical switch 22 and the twelfth optical switch 23. As shown in FIG.
Causes the monitoring signal input to the terminal d to be output to the terminal c,
The twelfth optical switch 23 outputs the monitoring signal input to the terminal c to the terminal d. Therefore, the fifth coupler 67
The supervisory signal demultiplexed at the above passes through the eleventh optical switch 22, and the supervisory control unit 21 for supervisory monitors and controls the main signal.
The signal passes through the twelfth optical switch 23, is multiplexed with the main signal by the sixth coupler 70, and is transmitted to the subsequent relay station 52 or one terminal station 50.

According to the third embodiment, a single supervisory control unit and a single redundant supervisory control unit can transmit and receive bidirectional supervisory signals. The configuration is simpler than in the form.

The present invention is not limited to the above embodiment, and various changes can be made within the scope of the technical matters described in the claims. For example, switching between the monitoring control unit and the redundant monitoring control unit by an optical switch may be performed by remote control.

[0065]

According to the present invention, since the opto-electric converter and the electro-optical converter of the monitoring control unit have a redundant configuration, it is possible to cope with a failure of the opto-electric converter and the electro-optical converter. And the reliability of the system can be improved.

Further, it is possible to monitor and maintain the aged deterioration of the optical-electrical converter and the optical components in the electro-optical converter.

Further, since the redundant supervisory control unit monitors the supervisory control unit and operates as a supervisory control unit when a failure occurs, there is no need to separately provide a network supervisory processor as in the prior art. The configuration of the system is simplified.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram for explaining an operation of an optical communication monitoring system according to a first embodiment of the present invention in a normal state;

FIG. 2A is a block diagram illustrating a configuration of a monitoring control unit;
FIG. 3B is a block diagram illustrating a configuration of a redundant supervisory control unit.

FIG. 3 is an explanatory diagram illustrating an operation of the optical communication monitoring system according to the first embodiment of the present invention when a failure occurs in the first monitoring control unit and the second monitoring control unit.

FIG. 4 is an explanatory diagram for explaining an operation of the optical communication monitoring system according to the second embodiment of the present invention in a normal state;

FIG. 5 is an explanatory diagram illustrating an operation of the optical communication monitoring system according to the second embodiment of the present invention when a failure occurs in the first monitoring control unit.

FIG. 6 is an explanatory diagram for explaining an operation of the optical communication monitoring system according to the second embodiment of the present invention when a failure occurs in the second monitoring control unit.

FIG. 7 is an explanatory diagram for explaining an operation of the optical communication monitoring system according to the third embodiment of the present invention in a normal state.

FIGS. 8A to 8C are explanatory diagrams for explaining switching of an optical switch of the optical communication monitoring system according to the third embodiment of the present invention.

FIG. 9 is an explanatory diagram schematically showing a conventional optical communication monitoring system.

FIG. 10 is an explanatory diagram showing a conventional optical loop monitoring device.

[Explanation of symbols]

 1: first supervisory control unit 2: second supervisory control unit 3: photoelectric converter 4: supervisory control circuit 5: electro-optical converter 6: first redundant supervisory control unit 7: second redundant supervisory control unit Supervisory controller 8: Redundant supervisory control circuit 9: First optical switch 10: Second optical switch 11: Third optical switch 12: Fourth optical switch 13: Redundant supervisory controller 14: Fifth Optical switch 15: Sixth optical switch 16: Seventh optical switch 17: Eighth optical switch 18: Ninth optical switch 19: Tenth optical switch 20: Supervisory controller 21: Redundant supervisory controller 22 : Eleventh optical switch 23: twelfth optical switch 24: timer

Claims (3)

[Claims] An optical communication monitoring system, comprising: a monitoring control unit that includes a photoelectric converter and an electro-optical converter, and that monitors and controls a main signal by transmitting and receiving a monitoring signal transmitted to an optical transmission line. The monitoring control unit monitors at least the opto-electric converter and the electro-optical converter, and when at least one of the opto-electric converter and the electro-optical converter fails, operates as a monitoring control unit by itself. An optical communication monitoring system comprising a redundant monitoring control unit. 2. A first monitoring and control unit comprising an optical-electrical converter and an electro-optical converter, transmitting and receiving a monitoring signal transmitted through a one-way optical transmission line, and monitoring and controlling a main signal; A second monitoring control unit comprising an electric converter and an electro-optical converter, and transmitting and receiving a monitoring signal transmitted to the optical transmission line in the other direction to monitor and control the main signal. Monitoring at least the opto-electrical converter and the electro-optical converter of the first monitoring control unit, and when at least one of the opto-electrical converter and the electro-optical converter fails, the monitoring control unit itself. And operates, and monitors at least the opto-electrical converter and the electro-optical converter of the second monitoring control unit, and a failure occurs in at least one of the opto-electrical converter and the electro-optical converter. Operates as a supervisory control unit An optical communication monitoring system, comprising: 3. An optical-electrical converter and an electro-optical converter, which monitor and control a main signal by transmitting and receiving a supervisory signal transmitted to an optical transmission line in one direction, and transmit and receive a supervisory signal to an optical transmission line in another direction. A monitoring control unit that transmits and receives the transmitted monitoring signal and monitors and controls the main signal; and monitors at least an opto-electric converter and an electro-optical converter of the monitoring control unit, and the opto-electric converter and the electro-optical converter. A redundant supervisory control unit that operates as a supervisory control unit by itself when a failure occurs in at least one of the devices, and is connected to the supervisory control unit and the redundant supervisory control unit, and performs the monitoring at predetermined time intervals. An optical communication monitoring system, comprising: switching means for switching a signal transmission / reception direction.