JP7103391B2 - Branch insertion device and optical transmission system - Google Patents

Description

The present invention relates to a branch insertion device, a network system, a transmission method, a control program and a management device, for example, a branch insertion device, a network system, a transmission method, a control program and a management device used in an optical communication network using wavelength multiplexing technology. Regarding.

In recent years, with the expansion of services that handle large-capacity contents such as audio and video, there is an increasing need for larger capacities and longer distances for optical transmission networks. In order to meet such demands, the introduction of WDM (Wavelength Division Multiplexing) technology has been studied in recent optical transmission networks.

In optical communication by WDM technology, it is possible to form a signal channel for each individual wavelength in one optical fiber cable by utilizing the fact that the optical signal passing through the optical fiber does not interfere with the optical signal of different wavelengths. can.

Therefore, the amount of information that can be transmitted per unit time can be significantly increased with a single optical fiber cable. In addition, in order to build a more flexible network, development and development of ROADM (Reconfigurable Optical Add / Drop Multiplexer) as a branch insertion device that branches and inserts optical signals in units of wavelengths of light, such as terminal devices and relay devices. The introduction is in progress.

As a network technique using this ROADM, there are those disclosed in Prior Art Documents 1 to 4. In these ROADMs, the optical signal from the connection destination is attenuated, the power difference between the optical signals is adjusted, and the adjusted optical signal is multiplexed.

Japanese Unexamined Patent Publication No. 2011-040997 Japanese Unexamined Patent Publication No. 2013-123205 Special Table 2013-531909 International Publication No. 2009/145118

However, in the conventional branch insertion device, since the attenuation amount of the optical signal is fixed, there is a problem that the device connected to the branch insertion device cannot be changed.

An object of the present invention is to provide a branch insertion device capable of arbitrarily changing the device connected to the branch insertion device.

The branch insertion device of the present invention
The received wavelength-multiplexed optical signal is included in the wavelength-multiplexed optical signal and a communication unit capable of selectively transferring the received wavelength-multiplexed optical signal to at least one client device and at least one network for each wavelength constituting the wavelength-multiplexed optical signal. A control unit for instructing the communication unit of a transfer destination of the optical signal of the predetermined wavelength according to the attribute of the optical signal having the predetermined wavelength is provided, and the control unit has the predetermined communication unit with respect to the communication unit. The amount of attenuation of the optical signal of the predetermined wavelength is instructed according to the transfer destination of the optical signal of the wavelength, and the communication unit attenuates and attenuates the optical signal of the predetermined wavelength according to the instruction of the control unit. The later optical signal is transferred to the transfer destination.

The network system of the present invention
A branch insertion device capable of selectively transferring the received wavelength-multiplexed optical signal to at least one client device and at least one network for each wavelength constituting the wavelength-multiplexed optical signal, and the wavelength-multiplexed optical signal. The branch insertion device includes a control device that instructs the branch insertion device to transfer a transfer destination of the optical signal of the predetermined wavelength according to the attribute of the optical signal of the predetermined wavelength included, and the branch insertion device is the light of the predetermined wavelength. The optical signal having the predetermined wavelength is attenuated by an amount of attenuation according to the signal transfer destination, and the attenuated optical signal is transferred to the transfer destination.

The transmission method of the present invention
The received wavelength-multiplexed optical signal is selectively transferred to at least one client device and at least one network for each wavelength constituting the wavelength-multiplexed optical signal, and a predetermined wavelength included in the wavelength-multiplexed optical signal is included in the wavelength-multiplexed optical signal. The transfer destination of the optical signal of the predetermined wavelength is determined according to the attribute of the optical signal, the attenuation amount is set according to the transfer destination of the optical signal of the predetermined wavelength, and the attenuation amount is set according to the set attenuation amount. An optical signal having a predetermined wavelength is attenuated and transferred to the transfer destination.

The control program of the present invention
A control program of a branch insertion device capable of selectively transferring a received wavelength division multiplexing optical signal to at least one client device and at least one network for each wavelength constituting the wavelength division multiplexing optical signal, and connecting to the control program. A receiving step for receiving change information of the device to be connected and a change step for changing the attenuation amount when the connected device is changed are provided.

The management device of the present invention
An interface capable of communicating with a branch insertion device capable of selectively transferring the received wavelength-multiplexed optical signal to at least one client device and at least one network for each wavelength constituting the wavelength-multiplexed optical signal, and the above-mentioned A control unit capable of controlling the branch insertion device via an interface is provided, and the control unit responds to the branch insertion device according to the attributes of an optical signal having a predetermined wavelength included in the wavelength multiplex optical signal. The transfer destination of the optical signal of the predetermined wavelength and the attenuation amount of the optical signal of the predetermined wavelength according to the transfer destination of the optical signal of the predetermined wavelength are instructed.

According to the present invention, according to the present invention, it is possible to provide a branch insertion device capable of arbitrarily changing the device connected to the branch insertion device.

It is a block diagram which shows the structure of the network system which concerns on 1st Embodiment of this invention. It is a block diagram which shows the structure of the branch insertion apparatus which concerns on 1st Embodiment of this invention. It is a sequence diagram which shows the example of the communication of the network system which concerns on 1st Embodiment of this invention. It is a block diagram which shows the structure of the communication part of the branch insertion apparatus which concerns on 2nd Embodiment of this invention. It is a figure which shows the structure of the wavelength selection switch which concerns on 3rd Embodiment of this invention. It is a figure which shows the example in which the apparatus to which the output port is connected is changed in the wavelength selection switch which concerns on 3rd Embodiment of this invention. It is a figure which shows the structure of the wavelength selection switch which concerns on 3rd Embodiment of this invention. It is a figure which shows the example in which the apparatus to which the input port is connected is changed in the wavelength selection switch which concerns on 3rd Embodiment of this invention. It is a block diagram which shows the structural example of the wavelength path communication node apparatus which concerns on 3rd Embodiment of this invention. It is a figure which shows the structure of the network system which concerns on 4th Embodiment. It is a block diagram which shows the structure of the management apparatus of 4th Embodiment.

(First Embodiment)
Hereinafter, the branch insertion device and the network system according to the first embodiment will be described with reference to the drawings. FIG. 1 is a block diagram showing a configuration of a network system according to a first embodiment of the present invention. In FIG. 1, the network system 10 includes branch insertion devices 11 to 14, networks 15 to 19, terminal stations 20 to 21, and client devices 22.

The branch insertion devices 11 to 14 are connected to each other by a network 15. Further, the branch insertion devices 11 to 14 are also connected to the networks 16 to 19, the terminal stations 20 to 21, and the client devices 22, respectively. For these connections, for example, it is preferable to use a cable that transmits an optical signal such as an optical fiber.

Then, the branch insertion devices 11 to 14 transfer the optical signal received from each device according to the communication path.

The branch insertion device 11 is connected to the network 15, the network 16, the terminal station 20, and the client device 22. Then, the branch insertion device 11 receives optical signals from the network 15, the network 16, the terminal station 20, and the client device 22. Then, the branch insertion device 11 selects a communication path according to the attribute of the received optical signal, and transfers the optical signal to the transfer destination device of the selected communication path.

The transfer destination device is one of the devices connected to the branch insertion device. For example, in the branch insertion device 11, the transfer destination device is any one of the network 15, the network 16, the terminal station 20, and the client device 22.

When transferring an optical signal, the branch insertion device 11 adjusts the power of the transferred optical signal and transfers the transferred optical signal to the transfer destination device. That is, the branch insertion device 11 attenuates the power of the optical signal to be transferred, and transfers the attenuated optical signal to the transfer destination device.

When the device connected to the branch insertion device 11 (for example, the network 16, the terminal station 20 or the client device 22) is changed, the branch insertion device 11 changes the attenuation amount. Then, the branch insertion device 11 attenuates the power of the optical signal to be transferred by the changed attenuation amount, and transfers the attenuated optical signal to the transfer destination device. The amount of attenuation of the optical signal is set and changed for each device connected to the branch insertion device 11.

Next, the configuration of the branch insertion device will be described. FIG. 2 is a block diagram showing a configuration of a branch insertion device according to the first embodiment of the present invention. In FIG. 2, the branch insertion device 11 includes a communication unit 101 and a control unit 102. The branch insertion device 11 of FIG. 2 is a device corresponding to the branch insertion devices 11 to 14 of FIG.

The communication unit 101 connects to the network 15 and also to the client device 22, the terminal station 20, or the network 16. Then, the communication unit 101 transfers the optical signal received from the network, the client device, the terminal station, or the network to the transfer destination device instructed by the control unit 102.

Then, the communication unit 101 receives an optical signal from the network 15, the client device 22, the terminal station 20, or the network 16, and attenuates the received optical signal by the amount of attenuation instructed by the control unit 102. Then, the communication unit 101 transfers the attenuated optical signal to the transfer destination device.

The control unit 102 selects a communication path according to the attribute of the received optical signal, and instructs the communication unit 101 to transfer the optical signal to the selected communication path. Further, the control unit 102 instructs the communication unit 101 of the attenuation set for each device connected to the communication unit 101.

When the device connected to the communication unit 101 is changed, the control unit 102 instructs the communication unit 101 of the attenuation amount corresponding to the changed device.

Next, the communication procedure between the branch insertion device and the network and client devices will be described. FIG. 3 is a sequence diagram showing an example of communication of the network system according to the first embodiment of the present invention.

In FIG. 3, the branch insertion device 11 acquires the attribute information of the optical signal to be communicated. For example, the branch insertion device 11 acquires attribute information of an optical signal to be communicated based on a received optical signal or an external control signal. Then, the branch insertion device 11 selects a communication path according to the attributes of the received optical signal. Then, the branch insertion device 11 communicates the optical signal with the selected communication path.

For example, when the received optical signal is an optical signal to be transmitted to the client device 22 connected to the branch insertion device 11, the branch insertion device 11 transmits the optical signal to the client device 22. When the received optical signal is an optical signal to be transmitted to another device via the network 15 connected to the branch insertion device 11, the branch insertion device 11 transmits the optical signal to the network 15. The client device 22 may be the network 16 and the terminal station 20 in FIG.

The optical signal transmitted from the branch insertion device 11 is an optical signal whose power is adjusted by being attenuated by the branch insertion device 11. When the device connected to the branch insertion device 11 changes due to the increase / decrease of the network or the increase / decrease of the client device, the attenuation amount of the optical signal is changed. As a result, even if the device connected to the branch insertion device 11 is changed, communication can be performed with an optical signal having an appropriate power.

As described above, according to the branch insertion device of the first embodiment, when the device connected to the branch insertion device is changed, the branch insertion is performed by changing the attenuation amount of the optical signal communicated by the branch insertion device. The device connected to the device can be changed arbitrarily.

(Second embodiment)
FIG. 4 is a block diagram showing a configuration of a communication unit of the branch insertion device according to the second embodiment of the present invention. The same configurations as those in FIG. 1 are assigned the same numbers, and the description thereof will be omitted. In FIG. 4, the communication unit 101 includes a branch unit 111 and an insertion unit 112. Further, the communication unit 101 of FIG. 4 has a configuration corresponding to the communication unit 101 of FIG.

The branching unit 111 branches the optical signal received from the network, and determines the transmission destination of the optical signal based on the instruction of the control unit 102. Then, when the transmission destination of the optical signal is a branch destination device (for example, a client device 22 or a network 16) connected to the branch destination 111, the branch unit 111 transmits the optical signal to the branch destination device. Further, the branch portion 111 outputs other optical signals to the insertion portion 112.

For example, when the received optical signal is a multiplexed optical signal, the branching unit 111 branches and connects the optical signal addressed to the client device 22 or the network 16 connected to the branching unit 111 from the multiplexed optical signal. It is attenuated by the amount of attenuation set for each device, and the attenuated optical signal is transmitted to the client device 22 or the network 16 connected to the branch portion 111.

Then, when the device of the branch destination connected to the branch portion 111 is changed, the branch portion 111 changes the attenuation amount. Then, the branch portion 111 attenuates the power of the optical signal after branching by the amount of attenuation after the change. Then, the branching portion 111 transmits the attenuated optical signal to the branching destination device.

The insertion unit 112 receives an optical signal from the client device 22 or the network 16 connected to the insertion unit 112, and attenuates the received optical signal with an attenuation amount set for each device to be connected. Then, the insertion unit 112 inserts the attenuated optical signal into the optical signal output from the branching unit 111, and transmits the inserted optical signal to the network 15.

Then, when the insertion source device connected to the insertion portion 112 is changed, the insertion portion 112 changes the attenuation amount. Then, the insertion unit 112 attenuates the power of the optical signal to be transferred by the amount of attenuation after the change, and inserts the attenuated optical signal into the optical signal of the network 15. The amount of attenuation of the optical signal is set and changed for each device connected to the insertion unit 112.

Here, comparing the branch insertion device of the second embodiment with the conventional device, since the attenuation amount of the optical signal is fixed in the conventional device, the device connected to the insertion unit 112 is changed. The level of the optical signal input to the insertion unit 112 changes, and the power balance between the optical signal to be inserted and the optical signal to be inserted is lost. Therefore, if the power of one of the inserted optical signal and the inserted optical signal is too strong, the other optical signal is interfered with and the optical signal is deteriorated.

On the other hand, in the branch insertion device of the second embodiment, even if the device connected to the insertion unit 112 is changed, the attenuation amount is changed according to the power of the optical signal from the changed device, so that the insertion is performed. The balance between the power of the optical signal to be used and the power of the inserted optical signal is not lost. Therefore, even if an arbitrary connection is made to an arbitrary port, it is possible to prevent one of the inserted optical signal and the inserted optical signal from interfering with the other and deteriorating.

As described above, according to the branch insertion device of the second embodiment, when the device to be connected is changed, the amount of attenuation of the optical signal transmitted from the device to be connected is changed to obtain the optical signal to be inserted. The power can be balanced with the inserted optical signal, and the influence of interference due to the insertion of the optical signal can be suppressed.

In the above description, both the branch portion 111 and the insertion portion 112 are provided, but one branch portion 111 may be provided or the other insertion portion 112 may be provided.

(Third Embodiment)
In the third embodiment, an example in which the branch insertion device is applied to the wavelength selective switch (Wavelength Selective Switch) will be described. FIG. 5 is a diagram showing a configuration of a wavelength selection switch according to a third embodiment of the present invention. The wavelength selection switch 200 of FIG. 5 has a configuration applicable to the branch portion 111 of FIG. In FIG. 5, the wavelength selection switch 200 includes a wavelength demultiplexer 201, variable optical attenuators 202A to 202D, optical switches 203A to 203D, duplexers 204A to 204C, and a control unit 205.

The wavelength demultiplexer 201 demultiplexes the optical signal input from the common port in wavelength units. Then, the wavelength demultiplexer 201 outputs the demultiplexed optical signal to the variable optical attenuators 202A to 202D for each wavelength.

The variable optical attenuators 202A to 202D attenuate the optical signal. Then, the variable optical attenuators 202A to 202D output the attenuated optical signals to the optical switches 203A to 203D, respectively. The amount of attenuation in the variable optical attenuators 202A to 202D is variable and is determined by the instruction of the control unit 205.

The optical switches 203A to 203D select the output destination of the optical signal from the combiners 204A to 204C and output the optical signal.

The combiners 204A to 204C combine the optical signals output from the optical switches 203A to 203D, respectively. Then, the combiners 204A to 204C output the combined optical signals to the optical output ports A to C, respectively.

The control unit 205 instructs the amount of attenuation of the variable optical attenuators 202A to 202D, and also instructs the selection destination of the optical switches 203A to 203D. The selection destination of the optical switches 203A to 203D is determined by the route information from the outside. As shown in FIG. 9, which will be described later, when a plurality of directions are provided, the control unit 205 may be provided for each direction, and the control unit 102 may control the plurality of control units 205.

Further, the attenuation amount of the variable optical attenuators 202A to 202D is set in wavelength units demultiplexed by the wavelength demultiplexer 201 based on the connection destination information of the output ports A to C to which the wavelength is output. Here, the connection destination information is information about the devices and networks connected to the output ports A to C. Then, when the device to which the output port is connected is changed, the control unit 205 changes the attenuation amount of the output port to which the device to be connected is changed.

FIG. 6 is a diagram showing an example in which the device to which the output port is connected is changed in the wavelength selection switch according to the third embodiment of the present invention. In FIG. 6, XC indicates that the connection destination is a cross-connect (wavelength cross-connect), and DROP indicates a branching client device. In FIG. 6, the wavelength selection switch 200 is connected to the cross-connect at the optical output ports A and C, and is connected to the branching client device at the optical output port B.

Here, when the connection target of the optical output port C is changed to the client device that branches from the cross connect, the control unit 205 changes the attenuation amount of the variable optical attenuators 202A to 202D corresponding to the optical output port C. Instruct.

By changing the amount of attenuation, the power of the signal of the optical output port C becomes a level suitable for the branching client device.

Next, an example of applying the wavelength selection switch to the insertion unit 112 will be described. FIG. 7 is a diagram showing a configuration of a wavelength selection switch according to a third embodiment of the present invention. The wavelength selection switch 300 of FIG. 7 has a configuration applicable to the insertion portion 112 of FIG. In FIG. 7, the wavelength selection switch 300 includes wavelength demultiplexers 301A to 301C, optical switches 302A to 302D, variable optical attenuators 303A to 303D, a combiner 304, and a control unit 305.

The wavelength demultiplexers 301A to 301C demultiplex the optical signals input from the optical input ports A to C in wavelength units. Then, the wavelength demultiplexers 301A to 301C output the demultiplexed optical signals to the optical switches 302A to 302D for each wavelength.

The optical switches 302A to 302D select the optical signals output from the wavelength demultiplexers 301A to 301C and output them to the variable optical attenuators 303A to 303D.

The variable optical attenuators 303A to 303D attenuate the optical signal input from the optical input port. Then, the variable optical attenuators 303A to 303D output the attenuated optical signal to the combiner 304. The amount of attenuation in the variable optical attenuators 303A to 303D is variable and is determined by the instruction of the control unit 305.

The combiner 304 combines the optical signals output from the variable optical attenuators 303A to 303D. Then, the combiner 304 outputs the combined optical signal to the common port.

The control unit 305 instructs the amount of attenuation of the variable optical attenuators 303A to 303D, and also instructs the selection source of the optical switches 302A to 302D. The selection source of the optical switches 302A to 302D is determined by the route information from the outside. As shown in FIG. 9, which will be described later, when a plurality of directions are provided, the control unit 305 may be provided for each direction, and the control unit 102 may control the plurality of control units 305.

Further, the attenuation amount of the variable optical attenuators 303A to 303D is the attenuation amount in wavelength units demultiplexed by the wavelength demultiplexers 301A to 301C based on the connection destination information of the input ports A to C to which the wavelength is input. To set. Here, the connection destination information is information about the devices and networks connected to the input ports A to C. Then, when the device to which the input port is connected is changed, the control unit 305 changes the attenuation amount of the input port to which the device to be connected is changed.

FIG. 8 is a diagram showing an example in which the device to which the input port is connected is changed in the wavelength selection switch according to the third embodiment of the present invention. In FIG. 8, XC indicates that the connection destination is a cross-connect (wavelength cross-connect), and ADD indicates a client device to be inserted. In FIG. 8, the wavelength selection switch 300 is connected to the cross-connect at the optical input ports A and C, and is connected to the client device to be inserted at the optical output port B.

Here, when the connection target of the optical input port C is changed to the client device to be inserted from the cross connect, the control unit 305 changes the attenuation amount of the variable optical attenuators 303A to 303D corresponding to the optical input port C. Instruct.

By changing the amount of attenuation, the power of the signal of the optical input port C becomes a level suitable for the client device to be inserted.

As described above, according to the insertion branching device of the third embodiment, when the device to which the port is connected is changed, the attenuation amount of the optical signal corresponding to the device to be connected is changed to the port. Since the connected device can be changed arbitrarily, resources with a limited number of ports can be effectively used. Further, since the device connected to the port can be arbitrarily changed, the device connected to the insertion / branching device can be flexibly operated.

It is preferable to apply the wavelength selection switch of the third embodiment to the wavelength path communication node device. Hereinafter, an example in which the wavelength selection switch is applied to the wavelength path communication node device will be described.

FIG. 9 is a block diagram showing a configuration example of the wavelength path communication node device according to the third embodiment of the present invention. In FIG. 9, the wavelength path communication node device 400 includes a wavelength cross-connect WXC401, a wavelength cross-connect WXC402, an optical receiving unit 410, 411, an optical transmitting unit 412, 413, and an insertion / branching 420. , 421 and a concentrator 430. Further, the wavelength path communication node device 400 exchanges optical signals with the client devices 440 to 443. The functions and operations of each configuration are shown below.

The wavelength cross-connect WXC401 has wavelength selection switches WSS401A and 401B. Similarly, the wavelength cross-connect WXC402 has wavelength selection switches WSS402A and 402B. These wavelength selection switches are composed of an optical module and a control module, and have a port switch function for connecting an input WDM signal to a different output port for each wavelength and an attenuation function for adjusting the transmitted light power for each wavelength. ..

The optical receiving units 410 and 411 have an optical attenuator and an optical amplifier, adjust the power of the optical signal from the direction, and output the adjusted optical signal to the wavelength selection switches WSS401A and 402A.

The optical transmission units 412 and 413 have an optical amplifier, amplify the optical signals from the wavelength selection switches WSS401B and 402B, and output them to the direction.

The insertion / branch 420 has an ODMUX (Optical Demultiplexer) 420A, a transponder 420B, and an OMUX 420C. Similarly, the insert / branch 421 has an ODMUX 421A, a transponder 421B, and an OMUX 421C.

The optical signal output from the wavelength selection switch WSS401A takes out the signal wavelength assigned to the client device 440 in the ODMUX 420A and is output to the client device 440 via the transponder 420B.

Further, the optical signal from the client device 440 is converted to the wavelength assigned by the transponder 420B, combined with the OMUX420C, and output to the wavelength selection switch WSS401B.

The line concentrator 430 has an optical switch 430A and transponders 430B and 430C.

The optical switch 430A selects an optical signal to be transmitted to the client devices 442 and 443 from the optical signal received from the wavelength cross-connect WXC 401 and 402, and outputs the selected optical signal to the client devices 442 and 443 via the transponders 430B and 430C. do.

Further, the transponders 430B and 430C convert the optical signals from the client devices 442 and 443 into optical signals suitable for wavelength division multiplexing. Then, the optical switch 430A selects one of the wavelength cross-connects WXC401 and 402, and outputs the converted optical signal to the selected wavelength cross-connect.

For example, the transponder 430B is for branching and inserting a signal for the client device 442 from the transmission line (directions P10a, b), and the transponder 430C is for branching and inserting a signal for the client device 443 from the transmission line (directions P20a, b). By switching the optical switch 430A, the transponder 430C can be inserted into a branch of a signal from the transmission line (directions P10a, b) to the client device 442, and the transponder 430B can be inserted into the transmission line (directions P20a, b). It can also be used for branch insertion of a signal for the client device 443 from.

Next, the connection and operation of the wavelength selection switch that exchanges optical signals with each of these configurations will be described.

The wavelength selection switch WSS401A is connected to the optical receiving unit 410 by a common port, and is connected to the ODMUX 420A, the wavelength selection switch WSS402B and the optical switch 430A by a selection port. Similarly, the wavelength selection switch WSS402A is connected to the optical receiving unit 411 at a common port, and is connected to the ODMUX 421A, the wavelength selection switch WSS401B and the optical switch 430A at a selection port.

Further, the wavelength selection switch WSS401B is connected to the optical transmission unit 412 by a common port, and is connected to the OMUX420C, the wavelength selection switch WSS402A and the optical switch 430A by a selection port. Similarly, the wavelength selection switch WSS402B is connected to the optical transmission unit 413 by a common port, and is connected to the OMUX421C, the wavelength selection switch WSS401A and the optical switch 430A by a selection port.

That is, the wavelength path communication node device 400 of the present embodiment includes the wavelength selection switches WSS401A and 402A as a configuration for selectively branching the optical signal from the optical receiving units 410 and 411, so that the wavelength of the ROADM without the CDC function is provided. In addition to the cross-connect WXC, a concentrator (aggregator) composed of a plurality of optical switches is mounted to realize a CDC function.

Then, the selection port of the wavelength selection switch can be connected to any of the wavelength selection switch, the concentrator, the branching or inserting client, and the connection target can be changed.

Next, signal processing will be described.
The wavelength division multiplexing signal from the direction P10b is output to the common port of the wavelength selection switch WSS401A after the signal power is adjusted by the optical receiving unit 410. Then, the wavelength selection switch WSS401A selects a selection port for outputting a wavelength division multiplexing signal for each wavelength, and outputs the selected optical signal to the ODMUX 420A, the wavelength selection switch WSS402B, or the optical switch 430A connected to the selection port.

The optical signal output to the ODMUX 420A takes out the signal wavelength assigned to the client device 440 in the ODMUX 420A and is output to the client device 440 via the transponder 420B.

Further, the optical signal output to the wavelength selection switch WSS402B is inserted into another optical signal by the wavelength selection switch WSS402B, power is adjusted by the optical transmission unit 413, and then sent to the route P20a.

Further, the optical signal output to the optical switch 430A selects the optical signal to be transmitted to the client devices 442 and 443 in the optical switch 430A, and is output to the client devices 442 and 443 via the transponders 430B and 430C.

In this way, the wavelength division multiplexing signal from the direction is output to the direction or the client device by selecting the optical signal for each wavelength by the wavelength selection switch.

Further, the optical signal from the client device is also output to the optical switch 430A via the transponders 430B and 430C, and the optical switch 430A outputs the converted optical signal to the selected wavelength cross-connect. Then, it is inserted into another optical signal by the wavelength selection switch and output to the direction via the optical transmission unit.

As described above, the wavelength path communication node device of the present embodiment uses the wavelength selection switch to transmit the optical signal from the direction to any of the insertion side wavelength selection switch of the opposite direction, the line concentrator, and ODMUX / OMUX by wavelength. By outputting an optical signal and adjusting the optimum ATT based on the input / output port information, RODAM can be configured with the wavelength cross-connect and the concentrator as the optimum power configuration, and any connection destination can be connected to any port. , It is possible to realize a wavelength path communication node device that can output an arbitrary wavelength, can output to an arbitrary direction, and has no wavelength / direction collision.

It is also possible to replace the wavelength selection switch WSS401A of the wavelength cross-connect WXC401 of FIG. 9, the wavelength selection switch WSS402A of the wavelength cross-connect WXC402, and the splitter.

Further, although FIG. 9 shows an example in which the wavelength selection switch has two directions, the number of WSS ports may be expanded and changed to any number of directions. Further, the wavelength division multiplexing number of the wavelength division multiplexing optical signal output to each port may be changed to an arbitrary number.

(Fourth Embodiment)
In the fourth embodiment, the device for controlling the branch insertion device of the first to third embodiments will be described. FIG. 10 is a diagram showing a configuration of a network management system according to a fourth embodiment. In FIG. 10, the network management system 500 includes a management device 501 and a branch insertion device 11. Here, the management device 501 is, for example, an NMS (Network Management System) / EMS (Element Management System) that manages a communication network or a network device.

The management device 501 accepts the registration of the connection information from the user and registers the connection information. Then, the management device 501 transmits the connection information to the branch insertion device 11. Here, when the connection information that the device connected to the branch insertion device 11 is changed is received, the management device 501 transmits to the branch insertion device 11 that the connection target has been changed.

The branch insertion device 11 is a branch insertion device according to any one of the first to third embodiments. When the connection information regarding the change of the connection target is received, the branch insertion device 11 changes the attenuation amount of the optical signal communicated by the branch insertion device 11.

Next, the configuration of the management device 501 will be described. FIG. 11 is a block diagram showing a configuration of a management device according to a fourth embodiment.

In FIG. 11, the management device 501 includes a control unit 502 and an interface 503.

The control unit 502 accepts registration and change of connection information from the user, and registers the connection information. Then, when the control unit 502 receives the connection information that the device connected to the branch insertion device 11 changes, the control unit 502 outputs the connection information that the device connected to the branch insertion device 11 changes to the interface 503.

The interface 503 is an interface that outputs the connection information output from the control unit 502 to the branch insertion device 11. The interface 503 is preferably configured to communicate with the branch insertion device 11 by electrical or optical communication.

As described above, according to the management device of the fourth embodiment, when the device connected to the branch insertion device is changed, the change in connection can be notified to the branch insertion device. Therefore, the branch insertion device can be remotely controlled. Can be changed arbitrarily.

In the fourth embodiment, the control unit 502 of the management device 501 may instruct the amount of attenuation for each input port and each wavelength of the optical signal communicated by the branch insertion device 11.

Further, in each embodiment, the amount of attenuation includes 0. That is, when the setting is not to attenuate, the amount of attenuation is 0. Further, in each embodiment, an amplifier may be provided instead of the attenuator, and the power of each optical signal may be amplified by using the amount of attenuation as the amount of amplification. In this case, the control unit 102 of the branch insertion device 11 and the control unit 502 of the management device 501 control / instruct the amplification amount for each input port and each wavelength of the optical signal communicated by the branch insertion device 11.

Further, the transfer of the optical signal may be performed by multicast.

Further, the control unit of each of the above embodiments, or the operation and configuration related to the control, can be carried out by hardware or software such as an ASIC (Application Specific Integrated Circuit). Further, a part of the processing may be performed by software, and the other part may be performed by hardware. When implemented by software, a computer system having one or a plurality of CPUs (Central Processing Units) such as a microprocessor may be made to execute a program related to processing of functional blocks. These programs can be stored and supplied to a computer using various types of non-transitory computer readable media. Non-transitory computer-readable media include various types of tangible storage media. Examples of non-temporary computer-readable media include magnetic recording media (eg flexible discs, magnetic tapes, optical disc drives), opto-magnetic recording media (eg optomagnetic discs), CD-ROMs (Compact Disc Read Only Memory), CD- R, CD-R / W, DVD-ROM (Digital Versatile Disc Read Only Memory), DVD-R (DVD Recordable), DVD-R DL (DVD-R Dual Layer), DVD-RW (DVD ReWritable), DVD- RAM, DVD + R, DVR + R DL, DVD + RW, BD-R (Blu-ray (registered trademark) Disc Recordable), BD-RE (Blu-ray (registered trademark) Disc Rewritable), BD-ROM, semiconductor memory (for example, mask ROM) , PROM (Programmable ROM), EPROM (Erasable PROM), flash ROM, RAM (random access memory)). The program may also be supplied to the computer by various types of transient computer readable media. Examples of temporary computer-readable media include electrical, optical, and electromagnetic waves. The temporary computer-readable medium can supply the program to the computer via a wired communication path such as an electric wire and an optical fiber, or a wireless communication path.

The present invention is suitably applicable to any wavelength path communication node device and transmission method used in an optical communication network using a wavelength division multiplexing technique.

10 Network system 15-19 Network 11-14 Branch insertion device 20-21 Terminal station 22, 440-443 Client device 101 Communication unit 102 Control unit 111 Branch unit 112 Insert unit 200, 300, 401A-402B Wavelength selection switches 201, 301A -301C Wavelength Demultiplexer 202A-202D, 303A-303D Variable Optical Attenuator 203A-203D, 302A-302D, 430A Optical Switch 204A-204C, 304 Combiner 205, 305, 502 Control Unit 400 Wavelength Path Communication Node Device 401 , 402 Wavelength Cross Connect 410, 411 Optical Receiver 412, 413 Optical Transmitter 420, 421 Branch 420B, 421B, 430B, 430C Transponder 430 Concentrator 500 Network Management System 501 Management Device 503 Interface

Claims (18)

A demultiplexer that demultiplexes a wavelength division multiplexing optical signal into multiple optical signals,
A first optical attenuator that attenuates at least the first optical signal among the plurality of optical signals,
A first output port that outputs the attenuated first optical signal to the connected device, and
The first optical attenuator is provided with a control unit for instructing the amount of attenuation corresponding to the device to which the first output port is connected.
The control unit is a branch insertion device that changes the amount of attenuation according to the changed connection destination device when the connection destination device of the first output port is changed. A second optical attenuator that attenuates at least a second optical signal among the plurality of optical signals,
It is provided with a second output port that outputs the attenuated second optical signal to the connected device.
The branch insertion device according to claim 1, wherein the control unit instructs the second optical attenuator of the amount of attenuation corresponding to the device to which the second output port is connected. An optical switch for controlling a transfer destination for each wavelength constituting the wavelength division multiplexing optical signal is provided.
The control unit instructs the optical switch of the transfer destination for each wavelength.
The optical switch selectively transfers the wavelength division multiplexing optical signal demultiplexed by the demultiplexer to the device to which the first output port is connected, which is the transfer destination, for each wavelength. Or the branch insertion device according to 2. The third aspect of claim 3, wherein the optical switch selectively switches the transfer destination of the optical signal of the wavelength according to the attribute of the optical signal of the wavelength included in the wavelength-multiplexed optical signal in response to an instruction from the control unit. Branch insertion device. At the time of the change, the control unit instructs the first optical attenuator with a predetermined attenuation amount as a second attenuation amount according to the device to be connected after the change.
The branch insertion device according to claim 3, wherein the optical switch transfers an optical signal of the wavelength attenuated by the second attenuation amount to the device of the connection destination after the change, which is the transfer destination. The branch insertion device according to any one of claims 3 to 5, wherein the optical switch outputs the first optical signal via an output port corresponding to the attribute of the first optical signal. The branch insertion device according to any one of claims 1 to 6, wherein the connection-destination device is a client device or a cross-connect device. A third optical attenuator that attenuates the third optical signal input from the first input port,
A fourth optical attenuator that attenuates the fourth optical signal input from the second input port,
The third optical signal attenuated by the third optical attenuator and the fourth optical signal attenuated by the fourth optical attenuator are combined and output.
The control unit instructs the third optical attenuator of the third light attenuation corresponding to the first input port, and determines the fourth light attenuation corresponding to the second input port. Instruct the fourth optical attenuator
The third light attenuation is determined in correspondence with the connection destination of the first input port.
The branch insertion device according to any one of claims 1 to 7, wherein the fourth light attenuation amount is determined in correspondence with a connection destination of the second input port. The control unit receives connection information indicating the output destination of the first optical attenuator from an external management device, and specifies the amount of attenuation with respect to the first optical signal based on the connection information. Claims 1 to 8. The branch insertion device according to any one of the above. It is provided with an optical transmission line for transmitting a wavelength-multiplexed optical signal and a branch insertion device for inputting the wavelength-multiplexed optical signal from the optical transmission line.
The branch insertion device is
A demultiplexer that demultiplexes the wavelength division multiplexing optical signal into a plurality of optical signals,
A first optical attenuator that attenuates at least the first optical signal among the plurality of optical signals and outputs the first optical signal to the first connected device connected to the branch insertion device.
The first optical attenuator is provided with a control unit for instructing a first attenuation amount corresponding to the first connected device.
When the device connected to the branch insertion device is switched from the first connection destination device to the second connection destination device, the control unit determines the amount of attenuation instructed to the first optical attenuator. The first optical attenuator attenuates the first optical signal by the second attenuation amount, so that the first optical attenuator is changed to a second attenuation amount different from the first attenuation amount. Output to the connected device,
Optical transmission system. A second optical attenuator that attenuates at least the second optical signal among the plurality of optical signals and outputs the second optical signal to the third connected device is provided.
The optical transmission system according to claim 10, wherein the control unit instructs the second optical attenuator of the amount of attenuation corresponding to the third connected device. An optical switch for controlling the transfer destination for each wavelength constituting the wavelength division multiplexing optical signal is provided.
The control unit instructs the optical switch of the transfer destination for each wavelength.
According to claim 10 or 11, the optical switch selectively transfers the wavelength division multiplexing optical signal demultiplexed by the demultiplexer to the first connection destination device, which is the transfer destination, for each wavelength. The optical transmission system described. The twelfth aspect of claim 12, wherein the optical switch selectively switches the transfer destination of the optical signal of the wavelength according to the attribute of the optical signal of the wavelength included in the wavelength-multiplexed optical signal in response to an instruction from the control unit. Optical transmission system. At the time of the switching, the control unit instructs a predetermined attenuation amount according to the device to be connected to the second connection.
The optical transmission system according to claim 13, wherein the optical switch transfers an optical signal of the wavelength attenuated by the second attenuation amount to the transfer destination device of the connection destination after the switching . The optical transmission system according to claim 13 or 14, wherein the optical switch outputs the first optical signal via an output port corresponding to the attribute of the first optical signal. The optical transmission system according to any one of claims 10 to 15, wherein the first connection destination device is a client device or a cross-connect device. A third optical attenuator that attenuates the third optical signal input from the first input port,
A fourth optical attenuator that attenuates the fourth optical signal input from the second input port,
The third optical signal attenuated by the third optical attenuator and the fourth optical signal attenuated by the fourth optical attenuator are combined and output.
The control unit instructs the third optical attenuator of the third light attenuation corresponding to the first input port, and determines the fourth light attenuation corresponding to the second input port. Instruct the fourth optical attenuator
The third light attenuation is determined in correspondence with the connection destination of the first input port.
The optical transmission system according to any one of claims 10 to 16, wherein the fourth light attenuation amount is determined in correspondence with a connection destination of the second input port. The control unit receives connection information indicating the output destination of the first optical attenuator from an external management device, and specifies the amount of attenuation with respect to the first optical signal based on the connection information. Claims 10 to 17 The optical transmission system according to any one of the above.

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