JPH11341530A - Monitoring method for optical adm device, and optical adm device using the method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a monitoring method by which a more accurate fault recovery is made possible and to provide an optical ADM device using the method. SOLUTION: Power supply sections 13, 14 are configured in duplicate to supply power to optical switch control sections 7-10 so that optical switches 3-6 can continue their operations even when one power supply is faulty. Furthermore, an alarm signal to troubleshoot the power supply sections is synthesized (17) with a main signal and the resulting signal is transmitted to a transmission line so as to inform a terminal station device of fault information of the power supply sections. Thus, a relief job of the failure on the occurrence of the fault is executed without causing any mistake.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical ADM apparatus used in a wavelength division multiplexing optical transmission system, which prevents erroneous connection of input / output signals when a power supply of an optical switch control unit fails and transmits power supply failure information to a terminal station. The present invention relates to an optical ADM device that can notify a device.

[0002]

2. Description of the Related Art In an optical communication network, an optical ADM (Add) having a function of inserting a signal from a node into an optical transmission line or branching a signal from an optical transmission line to a node.
Providing a Drop Multiplexing device increases the flexibility of network operation. However, in order to enhance the reliability of the network, it is important to provide a means for monitoring a failure or erroneous connection of this node from the terminal equipment.

FIG. 3 shows an example of a configuration of an optical ADM apparatus used in a conventional wavelength multiplexing system.

[0004] An optical amplifier 1 for amplifying a wavelength-multiplexed input signal, an optical demultiplexer 2 for demultiplexing the multiplexed signal, and a demultiplexed optical signal of each wavelength to a node side, or a signal from the node side. It comprises optical switch groups 3 to 6 for insertion, an optical multiplexer 11 for re-multiplexing the optical signal output of each optical switch, and an optical amplifier 12 for amplifying a signal multiplexed as a wavelength multiplexed signal. Each of the optical switches 3 to 6 has a switch control unit 7, a switch control unit 8, a switch control unit 9, and a switch control unit 10, and the switch control unit receives power supply from a power supply unit 13.

In each of the optical switches 3 to 6, a through mode in which an input signal is output to an output port as it is, and an input signal is branched and output to a DROP port, based on device control,
Instead, an input signal from the ADD port is inserted and switching to the ADD / DROP mode (cross mode) for outputting to the output port is executed. In addition, the optical switches 3 to 6
In the state where power is not supplied from the power supply, all the devices are in a through mode as an initial state.

Here, for example, if the optical switch 3 is ADD / D
ROP mode (cross mode), ie, optical switch 3
Power supply 1 supplied to the switch control unit 7 when the input signal from the ADD port is operating with the input signal connected to the DROP port and the input signal from the ADD port connected to the output port.
If the optical switch 3 fails, the optical switch 3 has
The mode is switched to the through mode despite the operation in the P mode (cross mode). In such a state, the signal input from the ADD port becomes
Since the signal is not transmitted to the connected terminal equipment, a failure remedy such as transmission path switching between the terminal equipments should be taken immediately. However, if another signal is originally input to the input of the optical switch 3, Then, when the optical switch 3 is switched to the through mode, the input signal of the optical switch is transmitted to the connected terminal device, and although the signal is different from the previous one, it is as if the signal is momentarily interrupted as before. However, there is a problem that there is a possibility that it is erroneously recognized that a failure has occurred and adversely affects the failure remedy.

[0007]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems associated with the failure of the switch drive power supply,
It is an object of the present invention to provide a monitoring method that enables more accurate failure remedy and an optical ADM device using the same.

[0008]

A monitoring method for an optical ADM apparatus according to the present invention is characterized in that failure information of a power supply section of an optical switch constituting the apparatus is multiplexed with a main transmission signal of the system and transmitted. An alarm signal (ALM) detection circuit for detecting a power supply unit failure, comprising a plurality of power supply units for supplying power to the optical switch control unit;
E / O conversion circuit for converting a signal into an optical signal, and ALM
An optical ADM apparatus, comprising: an optical coupler that multiplexes a signal with a main signal and sends the multiplexed signal to a transmission path.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Light A according to a first embodiment of the present invention
FIG. 1 shows the configuration of the DM device.

The optical ADM apparatus according to the present embodiment includes an optical amplifier 1, an optical demultiplexer 2, optical switches 3 to 6, an optical multiplexer 11, an optical amplifier 12, switch controllers 7 to 10, a plurality of power supplies 13
, An ALM detector 15, an E / O (electric / optical) converter 16, and an optical coupler 17.

For example, a wavelength multiplexed signal input 100 in which optical signals of four wavelengths are multiplexed is input to the optical amplifier 1. The signal amplified by the optical amplifier 1 is input to the optical demultiplexer 2. The four signals split by the optical splitter 2 are input to the optical switch 3, the optical switch 4, the optical switch 5, and the optical switch 6, respectively. The output of each optical switch is input to the optical multiplexer 11. The output multiplexed by the optical multiplexer 11 is input to the optical amplifier 12. Each of the optical switches 3 to 6 has a switch control unit 7, a switch control unit 8, a switch control unit 9, and a switch control unit 10. The switch control units 7 to 9 are connected to a power supply unit 13 and a power supply unit 14, respectively. Of the two systems. The failure signal of the power supply unit 13 and the power supply unit 14 is A
It is input to the LM detector 15. The output signal of the ALM detector 15 is input to the E / O converter 16. E / O converter 1
The output signal converted into the optical signal in 6 is input to the optical coupler 17 and multiplexed with the output of the optical amplifier 12. The output signal of the optical coupler 17 is sent out to the transmission line as a wavelength multiplexed signal output 200.

Next, the operation of the optical ADM apparatus according to the first embodiment of the present invention will be described.

A wavelength-division multiplexed signal multiplexed by four waves is input from the transmission line, and is amplified by the optical amplifier 1 with a constant gain. The output of the optical amplifier 1 is input to the optical demultiplexer 2 and demultiplexed for each wavelength multiplexed. The signal demultiplexed by the optical demultiplexer 2 is
Optical switch 3, optical switch 4, optical switch 5,
Input to the optical switch 6. In the present optical switch, switching between a through mode in which an input signal is output as it is and an ADD / DROP mode in which an input signal is output to a DROP port and an input signal is output from an ADD port are executed by control in the device. Each of the optical switches 3 to 6 has a switch control unit 7, a switch control unit 8, a switch control unit 9, and a switch control unit 10, and receives two systems of power supply from a power supply unit 13 and a power supply unit 14. If one of the power supply units fails, each of the optical switches 3 to 6 can be continuously operated by the other power supply unit.
/ DROP mode can be maintained. The failure signals of the power supply unit 13 and the power supply unit 14 are input to the ALM detection unit 15, and the failure information signal of the power supply unit is output to the E / O conversion unit 16. E
The / O converter 16 converts the input electric signal into an optical signal and outputs the optical signal to the optical coupler 17. In addition, each optical switch 3
6 are input to the optical multiplexer 11 and multiplexed into four waves. The multiplexed signal is input to the optical amplifier 12 and amplified with a constant gain. The output signal of the optical amplifier 12 and the output signal of the E / O converter 16 are multiplexed by the optical coupler 17 and sent out as a wavelength multiplexed signal 200 to the transmission line. By multiplexing and transmitting the failure information of the optical switch power supply unit to the main signal, it is possible to notify important information in the failure relief work to the connected terminal device.

FIG. 2 shows an optical AD according to a second embodiment of the present invention.
FIG. 2 is a diagram illustrating a configuration of an M device, which is an example of an optical ADM device used in an n-wave multiplex transmission system in which the number of optical switches configuring the first embodiment illustrated in FIG. is there.

The wavelength-multiplexed input signal is input to the optical amplifier 1. The signal amplified by the optical amplifier 1 is input to the optical demultiplexer 2. The n signals demultiplexed by the optical demultiplexer 2 are input from the optical switch 3-1 to the optical switch 3-n. The output of each optical switch is input to the optical multiplexer 11. The output multiplexed by the optical multiplexer 11 is input to the optical amplifier 12. Also, the optical switches 3-1 to 3-n have switch control units 4-1 to 4-n, respectively.
n receives two power supplies from a power supply 13 and a power supply 14. The failure signal of the power supply 13 and the power supply 14
5 is input. The output signal of the ALM detector 15 is E / O
It is input to the conversion unit 16. The output signal converted into an optical signal by the E / O converter 16 is input to the optical coupler 17 and multiplexed with the output of the optical amplifier 12. The output signal of the optical coupler 17 is sent out to the transmission line as a wavelength multiplexed signal.

The basic principle and operation are the same as those of the first embodiment of the present invention shown in FIG. The wavelength-division multiplexed signal 100 multiplexed with n waves is input from the transmission line, and is amplified by the optical amplifier 1 with a constant gain. The output of the optical amplifier 1 is input to the optical demultiplexer 2 and demultiplexed for each wavelength multiplexed. The signals demultiplexed by the optical demultiplexer 2 are input from the optical switch 3-1 to the optical switch 3-n, each composed of n signals. These optical switches have a through mode in which an input signal is output as it is, and a DR in which an input signal is output.
Switching to the ADD / DROP mode in which the signal is output to the OP port and the input signal from the ADD port is output is executed. Each of the optical switches 3-1 to 3-n is connected to a switch control unit 4 respectively.
−1 to a switch control unit 4-n, and receives two power supplies from the power supply unit 13 and the power supply unit 14. If one of the power supply units fails, each of the optical switches 3-1 to 3-n can be continuously operated by the other power supply unit, and the state of the through mode or the ADD / DROP mode can be maintained. The failure signals of the power supply unit 13 and the power supply unit 14 are input to the ALM detection unit 15, and the failure information signal of the power supply unit is output to the E / O conversion unit 16. The E / O converter 16 converts the input electric signal into an optical signal and outputs the optical signal to the optical coupler 17.
The output signals of the optical switches 3-1 to 3-n are input to the optical multiplexer 11 and n-wave multiplexed. The multiplexed signal is input to the optical amplifier 12 and amplified with a constant gain.
The output signal of the optical amplifier 12 and the output signal of the E / O converter 16 are multiplexed by the optical coupler 17 and sent out as a wavelength multiplexed signal output 200 to the transmission line.

By multiplexing and transmitting the failure information of the optical switch power supply to the main signal, it is possible to notify the connected terminal equipment of important information in the repair work.

[0018]

As described above, in the present invention,
By adopting a configuration in which the power supply unit failure information of the optical switch is output as a multiplexed signal to the transmission line, the power supply failure information of the optical switch unit in the optical ADM apparatus can be notified to the connected terminal station, and the failure can be remedied. As a result, it is possible to more accurately perform the switching process and the like.

Further, the configuration in which the power supply of the optical switch unit is duplicated can reduce the cause of the occurrence of the erroneous connection of the optical switch due to the failure of the power supply unit.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a configuration of an optical ADM apparatus according to a first embodiment of the present invention.

FIG. 2 is a diagram illustrating a configuration of an optical ADM apparatus according to a second embodiment of the present invention.

FIG. 3 shows light A used in a conventional wavelength division multiplexing system.
FIG. 2 is a diagram illustrating a configuration of a DM device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Optical amplifier 2 Optical demultiplexer 3-6 Optical switch 7-10 Switch control part 11 Optical multiplexer 12 Optical amplifier 13, 14 Power supply 15 ALM detection part 16 E / O (electrical / optical) conversion part 17 Optical coupler 3- 1-3-n optical switch 4-1 through 4-n switch controller 100 wavelength multiplex signal input 200 wavelength multiplex signal output

Claims (6)

[Claims] 1. An optical ADM used in a wavelength division multiplexing system.
A method for monitoring an optical ADM apparatus, comprising multiplexing failure information of a power supply unit of an optical switch constituting the apparatus with a main transmission signal of the system and transmitting the multiplexed signal. 2. A first optical amplifier for amplifying a wavelength-multiplexed optical signal, an optical demultiplexer for demultiplexing the wavelength-multiplexed signal amplified by the optical amplifier, and a demultiplexer demultiplexed by the optical demultiplexer. A plurality of optical switches for switching the respective signals, an optical multiplexer for multiplexing the outputs of the plurality of optical switches, a second optical amplifier for amplifying the output of the optical multiplexer, and each of the plurality of optical switches A plurality of switch control units for controlling the driving of the power supply, a power supply unit for supplying power to the plurality of switch control units, an alarm detection unit for detecting a failure signal of the power supply unit, and an output signal of the alarm detection unit. An optical ADM apparatus, comprising: an E / O conversion unit for performing optical conversion; and an optical coupler for combining an output optical signal of the E / O conversion unit with an output of the second optical amplifier. 3. An output signal of the alarm detection unit is electrically /
3. The optical coupler according to claim 2, wherein a faulty optical signal of the optical switch power supply unit that performs optical conversion and outputs the E / O conversion unit is multiplexed by the optical coupler using a wavelength different from the main transmission signal. The optical ADM device according to claim 1. 4. The optical ADM apparatus according to claim 2, wherein a power supply unit that supplies power to said switch control unit supplies power to all switch control units collectively. 5. The optical ADM apparatus according to claim 2, wherein a plurality of power supply units for supplying power to said optical switch control unit are provided. 6. The plurality of optical switches have a two-input two-output optical input / output port, operate in two switch modes, a through mode and a cross mode, and are not supplied with power from the power supply unit. 3. The optical ADM apparatus according to claim 2, wherein all the states are in a through mode.