JP2001016169A - Optical transmission line repeater control system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress an influence upon a main signal by a control signal by transmitting or receiving the main signal regarding each pair of optical transmission lines, monitor controlling a state of the optical transmission lines and a repeater, combining monitor control parts, and enabling information to be transmitted to an adjacent device. SOLUTION: Control information transmitted to a monitoring control part 22 of an optical transmission line repeater 5 from a terminating device 1 by an operator is separated by an optical signal processing part 6 of an optical transmission line repeater 3 through an optical fiber 27 as a control signal and is transmitted to a monitoring control part 18. Since address information peculiar to the monitoring control part 22 of a target is added to this control information, the monitoring control part 18 transmits the control signal from the optical signal processing part 6 in order to transmit this control information to a next optical transmission line repeater 4 without processing the information. The control signal transmitted through the optical fiber 28 is similarly transferred to the next transmission optical transmission line repeater 5 at the optical transmission line repeater 4 as well.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to monitoring and control of an optical amplifier and a transmission line of an optical transmission line repeater constituting an optical signal transmission system, and more particularly to autonomous communication between the respective repeaters. The present invention relates to a possible optical transmission line relay device control method.

[0002]

2. Description of the Related Art FIG. 5 shows a conventional example of an optical signal transmission system. Optical transmission line repeaters 58, 5
9 and 60 are provided. These optical transmission line repeaters are connected by optical fibers 27 to 42 as shown. The optical transmission line repeaters are optical signal processing units 61 to 7 respectively.
2. It has monitoring control units 73 to 78.

Although not shown, the terminating device 1 multiplexes an input signal from an external device to form optical fibers 27 to 30, 35 to 35.
An optical signal is sent to the optical fiber 38 and the optical fibers 31 to 34, 39 to
The optical signal input from the input device 42 is separated and output to an external device (not shown). Also, the control signal to the optical transmission line repeaters 58 to 60 is superimposed on the output optical signal, and the control signal of the optical transmission line repeaters 58 to 60 is separated from the input optical signal.

[0004] The optical transmission line repeaters 58 to 60 amplify the optical signals attenuated by passing through the optical fibers 27 to 42 in the optical signal processing units 61 to 72, and transmit the amplified signals to the next repeater or terminal device. introduce. Although not shown, the optical signal processing units 61 to 72 have a configuration in which the control signal superimposed on the optical signal is separated, transmitted to the monitoring control unit, and the control signal from the monitoring control unit is superimposed on the optical signal. .

[0005] Optical signals passing through the optical fibers 27 to 42 include:
There is a main signal in the 1500 nm band. This main signal is modulated at a low modulation degree, and a control signal is superimposed and transmitted.

The monitoring control units 73 to 78 of the optical transmission line repeaters 58 to 60 measure the input / output power of the optical signal processing unit and monitor and control the internal state of the repeater in response to control signals from the terminating devices 1 and 2. And transmits the information such as the result to the terminating devices 1 and 2 with the control signal.

The terminating devices 1 and 2 are connected to each optical transmission line repeater 58.
Based on the information obtained by the control signal from ~ 60,
It detects abnormalities of the optical transmission line repeaters 58 to 60 and the optical fibers 27 to 42 in the optical transmission system and performs various controls.

[0008]

However, the above-mentioned conventional system has the following problems. Since the control signals transmitted from the terminating devices 1 and 2 and the optical transmission line relay devices 58 to 60 are obtained by modulating the main signal itself, there is a possibility that the quality of the main signal may be degraded due to some failure. In addition, the terminal devices 1 and 2 and the optical transmission line relay device 5
The control signals transmitted from the optical transmission line relay devices 58 to 60 are transmitted until reaching the terminal devices 1 and 2 located therebelow.
Therefore, only one signal or one other signal can exist on one optical fiber.

In a conventional system, a redundant configuration in a transmission path is used.
Since there is no switching configuration, the optical transmission line repeaters 58 to
If a failure occurs in any one of the optical fibers 60 and the optical fibers 27 to 42, communication of the control signal together with the main signal becomes impossible. The present invention solves the above-mentioned problems of the prior art, suppresses the influence of a control signal on a main signal, and transmits a control signal to a terminating device without interruption even if a failure occurs on a transmission line. Aim.

[0010]

According to a first aspect of the present invention, there is provided an optical transmission line relay device control system comprising a plurality of optical transmission line relay devices arranged between terminal devices, and a plurality of sets of these devices being connected between these devices. In an optical signal transmission system coupled by an optical transmission line, the optical transmission line relay device includes, for each pair of optical transmission lines, a pair of optical signal processing units that transmit or receive a main signal, and the optical transmission line and the relay device. A monitoring control unit that monitors and controls the state of the
Communication means for connecting the monitoring control units to each other so as to be able to transmit information to an adjacent device.

According to a second aspect of the present invention, there is provided an optical transmission line relay device control system according to the first aspect, wherein the supervisory control unit performs supervisory control and communication irrespective of an external supervisory control signal. It is characterized by the following.

According to a third aspect of the present invention, there is provided an optical transmission line relay device control system according to the first aspect, wherein the supervisory control unit performs supervisory control and communication in response to an external supervisory control signal. It is a feature.

According to a fourth aspect of the present invention, there is provided an optical transmission line relay device control system according to any one of the first to third aspects, wherein monitoring control information is exchanged between the monitoring control units in each relay device. Communication means.

According to a fifth aspect of the present invention, there is provided an optical transmission line relay device control method according to any one of the first to fourth aspects, wherein the supervisory control unit is controlled by another supervisory control unit in the same relay device. It is characterized by having means for restarting the arithmetic processing unit.

According to a sixth aspect of the present invention, there is provided the optical transmission line relay device control system according to any one of the first to fifth aspects, wherein the monitoring control unit is configured to control the periodic control signal from the terminal device or the adjacent relay device. And generating route information at the time of a transmission line failure based on the exchange of information with the above.

According to a seventh aspect of the present invention, there is provided an optical transmission line relay device control method according to the sixth aspect, wherein an information packet to be transmitted is transferred to another relay device in the same relay device based on the route information created by the monitoring control unit. The communication of the monitoring control information is continued by using another transmission path which is distributed to the monitoring control circuit of FIG.

The optical transmission line relay device control method according to claim 8 of the present invention is characterized in that, in any one of claims 1 to 7, the transmission of information in units of packets to an adjacent relay device is repeated to monitor. The control information is transmitted to another relay device or a termination device on the same non-adjacent transmission line.

According to a ninth aspect of the present invention, there is provided the optical transmission line relay device control method according to any one of the first to eighth aspects, wherein the monitoring control unit and the measurement information on the same transmission line in the adjacent relay device are transmitted. The present invention is characterized in that switching is performed, the state of an optical signal processing device in a transmission line or a relay device is determined, and the gain of an optical amplifier in the device is autonomously adjusted.

According to a tenth aspect of the present invention, there is provided an optical transmission line repeater control method according to any one of the first to ninth aspects, wherein a wavelength band different from a main signal is used for communication with an adjacent repeater or terminating device. The optical signal is used.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1 shows a configuration example of the optical transmission line relay device according to the first embodiment of the present invention. In addition,
The same parts as those of the prior art shown in FIG. 5 are denoted by the same reference numerals. In FIG. 1, by having communication means for communicating with an adjacent optical transmission line repeater and terminating device and communication means for monitoring and control units in the optical transmission line repeater, a control signal due to a failure in the transmission line or the repeater is provided. Loss and adverse effects on the main signal can be avoided.

The optical transmission line repeaters 3 to 5 shown in FIG. 1 perform optical signal processing units 6 to 5 for amplifying main signals and separating and coupling control signals.
17 and monitoring control units 18 to 23 connected thereto.
Are connected to communication devices 24 to 26 in the relay device which can communicate with each other and restart the central processing unit.

In the first embodiment, the control information transmitted from the terminating device 1 to the monitoring control unit 22 of the optical transmission line repeater 5 by the operator is transmitted as an optical fiber 27 as a control signal.
, And separated by the optical signal processing unit 6 of the optical transmission line relay device 3 and transmitted to the monitoring control unit 18. Since this control information has address information unique to the target monitoring control unit 22, the monitoring control unit 18 performs control to transmit this control information to the next optical transmission line repeater 4 without processing the control information. The signal is transmitted from the optical signal processing unit 6. Optical fiber 28
The control signal transmitted via the optical transmission line relay device 4
Is also transferred to the next optical transmission line repeater 5.

The control signal transmitted via the optical fiber 29 is separated by the optical signal processing unit 14 of the optical transmission line repeater 5, and the control information is transmitted to the monitoring control unit 22. Since the address information included in the control information matches the address information unique to the monitoring control unit, the control information is processed, and monitoring, measurement, and control in the repeater are executed according to the content. The response resulting from this processing is sent from the monitoring control unit 22 to the optical signal processing unit 15 as control information with the address information of the transmission source terminating device 1 added thereto, and the control signal is combined with the optical signal as the main signal. And transmitted to the optical transmission line relay device 4. This control signal is similarly transferred repeatedly and transmitted to the terminating device 1 which is the source of the original control information.

When a fault occurs in the optical fiber 28, even if control information is transmitted from the optical transmission line relay device 3 to the optical transmission line relay device 4, the confirmation information of the arrival at the lower level protocol is not returned. Therefore, it is determined that a failure has occurred in the optical fiber 28 or the optical transmission line repeater 4, and the monitoring controller 19 is requested to transmit control information to the optical transmission line repeater 4 via the intra-relay communication device 24. The control signal transmitted from the monitoring control unit 19 to the monitoring control unit 21 of the optical transmission line relay device 4 is transmitted to the monitoring control unit 20 by the communication device 25 in the relay device.
Is transmitted to. This control information is further transferred to the optical transmission line repeater 5 via the optical fiber 37. Since the optical fiber 29 is normal, the control information is transmitted to the control monitor 22 as usual. At this time, the route information of bypassing the optical fiber 28 is recorded in the monitoring control units 18 and 20, and thereafter, the control information is transmitted so as to bypass the optical fiber 28 from the beginning until this information is cleared for some reason. You.
When a change occurs in the route information, the information is also transmitted to the terminal devices 1 and 2.

The optical signal processing unit 10 of the optical transmission line repeater 4
11 or the failure of the monitoring control unit 20, the control information bypassed from the optical transmission line relay device 3 via the optical fiber 36 is not transmitted to the monitoring control unit 20, but is transmitted via the optical fiber 37. The information is transmitted to the monitoring control unit 23 of the road relay device 5 and transmitted to the target monitoring control unit 22 via the communication device 26 in the relay device. At this time, if it is determined that the failure is due to a software failure due to the communication in the relay device in the optical transmission line relay device 4, the processing device of the monitoring control unit 20 is restarted. If hardware failure or software failure continues, the route information at this time is recorded by the respective monitoring control unit, and thereafter, the monitoring control unit is cleared from the beginning until this information is cleared for some reason. The control information is transmitted so as to bypass the 20. If the route information changes,
The information is also transmitted to the terminal devices 1 and 2.

The monitoring control unit in the optical transmission line repeater performs various measurements in the repeater at a set fixed interval.
The information is exchanged with the monitoring control unit of the adjacent optical transmission line repeater. Along with this information exchange, the state of the optical fiber and the monitoring control unit is detected by communication, and if necessary, the path information is automatically corrected. Further, when an abnormality is found in the measurement result, each parameter of the optical signal processing unit is autonomously controlled within the adjustable range to keep the state of the transmission path normal. The change of the parameter at this time is the termination device 1,
2 is transmitted.

FIG. 2 shows the configuration and connection of the optical signal processing section 6 according to the first embodiment. In FIG. 2, reference numeral 43 in the optical signal processing unit 6 denotes a demultiplexer for detecting a control signal from the optical signal sent from the optical fiber 27, and reference numeral 44 denotes a photoelectric converter for converting the detected control signal into electricity. , 45 is an optical amplifier for amplifying the main signal, 46 is an electro-optical converter for converting a control signal from the monitoring control unit to light, and 47 is a light for combining and transmitting the control signal converted to light and the main signal. It is a filter.
The wavelength band of the light for converting the control signal uses a wavelength in a region deviating from the gain characteristics of the optical amplifier, thereby suppressing the influence on the main signal and transmitting control information to a non-adjacent optical transmission repeater or terminal device. Is suppressed from being transmitted.

Embodiment 2 FIG. 3 shows a second embodiment of the present invention. The same parts as those of the first embodiment shown in FIG. 1 are denoted by the same reference numerals. Embodiment 2
In this method, the number of monitoring control units in the repeater is one regardless of the number of optical fibers, and the optical transmission line repeater is centrally managed. The monitoring control units 48 to 50 shown in FIG.
5 is characterized in that the optical signal processing units 6 to 17 in 5 are centrally managed. When transmitting the control signal, an appropriate optical fiber is selected and transmitted based on the path information created and held inside the monitoring control unit.

In the first embodiment, a monitoring control unit exists for each optical fiber pair, and the monitoring control units are connected to each other by the communication device in the relay device. Time loss occurs through the device, and when the communication device fails, the bypass transmission of the control signal becomes impossible. According to the second embodiment, at the time of the detour transmission of the control signal due to the failure of the transmission line and the relay device, no time loss occurs due to the communication device in the relay device when switching the optical fiber for transmitting the control signal, and the transmission speed is high. Control signals can be transmitted. Further, it is possible to suppress the possibility of loss of the control signal due to a failure of the communication device in the relay device.

Embodiment 3 FIG. 4 shows a third embodiment of the present invention. The same components as those in the first embodiment shown in FIG. 1 are denoted by the same reference numerals. Embodiment 3 shown in FIG.
Now, the communication device 5 in the relay device capable of performing communication between the monitoring control units and communication with another communication device in another relay device.
1 to 53 and control signal transmission paths 54 to 54 physically different from the main signal for communication of control information between adjacent optical transmission path repeaters.
57 is prepared.

In the first embodiment, since the control signal is combined with the main signal and uses the same transmission line, the quality of the main signal may be degraded. In addition, there is a possibility that the failure of the control information transmission portion may have a serious effect on the main signal. According to the third embodiment, since the control signal uses a transmission line physically different from the main signal, a sufficient output is given as the control signal without affecting the main signal.
Reliable communication can be performed.

[0032]

As described above, the present invention has the following effects. According to the optical transmission line relay device control system of the first aspect of the present invention, transmission of a control signal is limited between adjacent relay devices, so that a failure due to a control signal abnormality or the like spreads over the entire transmission line. Can be avoided. .

According to the optical transmission line repeater control system according to the second aspect of the present invention, information obtained from various measuring devices in the repeater is compared with various information measured in the past to allow external transmission. Without control, faults in the optical transmission line repeater itself and the transmission line can be quickly discovered and, if possible, repaired autonomously.

According to the optical transmission line repeater control method according to the third aspect of the present invention, since the supervisory control is performed by an external supervisory control signal, the repeater is controlled at an arbitrary timing from the terminating device. Then, necessary information can be read from the relay device.

According to the optical transmission line repeater control method according to the fourth, sixth and seventh aspects of the present invention, even if a failure occurs in the transmission line or the optical transmission line repeater itself, the transmission path of the control signal is controlled. This can be changed to secure control information communication means.

According to the optical transmission line repeater control system of the fifth aspect of the present invention, each monitor control unit has means for restarting another monitor control unit in the same repeater. Recovery from minor failures including software-related factors can be performed automatically.

According to the optical transmission line repeater control system of the present invention, the transmission of information in units of packets to the adjacent repeater is repeated, so that the other repeater on the same non-adjacent transmission line can be used. Information can be transmitted to a relay device or a terminal device.

According to the optical transmission line repeater control method of the ninth aspect of the present invention, measurement information is exchanged with a monitoring control unit on the same transmission line in an adjacent repeater, and the transmission line and the repeater are exchanged. Since the state of the optical signal processing device is determined and the gain of the optical amplifier in the device is autonomously adjusted, it is possible to prevent a failure that may occur on the transmission line.

According to the optical transmission line repeater control method of the present invention, by separating the wavelength band of the control signal from the main signal, the influence of the control signal on the main signal on the transmission line even in the event of a failure of the control signal. Can be minimized.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a first embodiment of the present invention.

FIG. 2 is a block diagram illustrating a configuration and connections of an optical signal processing unit for explaining the present invention.

FIG. 3 is a block diagram showing a second embodiment of the present invention.

FIG. 4 is a block diagram showing a third embodiment of the present invention.

FIG. 5 is a block diagram of a conventional example.

[Explanation of symbols]

1, 2 terminator, 3-5 optical transmission line repeater, 6
~ 17 optical signal processing unit, 18 ~ 23 monitoring control unit,
24 to 26 relay device communication device, 27 to 42 optical fiber, 43 demultiplexer, 44 photoelectric converter, 4
5 optical amplifier, 46 electro-optical converter, 47 optical filter, 48-50 monitoring and control unit, 51-53 communication device in repeater, 54-57 control signal transmission line.

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5K002 AA06 BA02 BA04 BA05 BA06 CA13 DA01 DA02 DA05 EA06 EA07 EA31 EA33 FA01 GA03 5K042 BA02 BA10 CA10 CA13 CA15 CA16 CA19 DA11 DA33 EA04 EA09 FA06 FA15 FA21 FA25 GA01 JA02 LA11 LA15

Claims (10)

[Claims] 1. An optical signal transmission system comprising a plurality of optical transmission line repeaters disposed between terminal devices and coupling these devices with a plurality of sets of optical transmission lines, wherein the optical transmission line repeater comprises: For each set of optical transmission lines, a pair of optical signal processing units for transmitting or receiving the main signal, a monitoring control unit for monitoring and controlling the states of the optical transmission line and the relay device, and the monitoring control units are connected and adjacent to each other. And a communication means for transmitting information to the device. 2. The optical transmission line repeater control method according to claim 1, wherein said monitoring control unit performs monitoring control and communication without using an external monitoring control signal. 3. The optical transmission line repeater control system according to claim 1, wherein said monitoring control unit performs monitoring control and communication in response to an external monitoring control signal. 4. The optical transmission line relay device control system according to claim 1, further comprising communication means for exchanging monitoring control information between the monitoring control units in each relay device. 5. The apparatus according to claim 1, further comprising means for restarting the central processing unit from another monitoring control unit in the same relay device with respect to the monitoring control unit. Optical transmission line relay device control method. 6. The supervisory control unit creates route information at the time of a transmission line failure based on a periodic control signal from a terminating device or information exchange with an adjacent relay device. Item 6. An optical transmission line relay device control method according to any one of Items 1 to 5. 7. An information packet to be transmitted is distributed to another supervisory control circuit in the same relay device based on the route information created by the supervisory control unit, and the supervisory control information is transmitted using another parallel transmission line. 7. The method according to claim 6, wherein the communication is continued. 8. The method according to claim 1, wherein the transmission of the monitoring control information to another relay device or a terminating device on the same non-adjacent transmission line is repeated by repeating transmission of information in packet units to adjacent relay devices. 8. The optical transmission line relay device control method according to any one of claims 1 to 7. 9. Exchanging measurement information with a monitoring control unit on the same transmission line in an adjacent relay device, determining the state of the optical signal processing device of the transmission line or the relay device, and determining a gain of an optical amplifier in the device. The optical transmission line repeater control method according to any one of claims 1 to 8, wherein autonomous adjustment is performed. 10. The optical transmission line repeater according to claim 1, wherein an optical signal of a wavelength band different from a main signal is used for communication with an adjacent repeater or terminal. control method.