Technical field
[0001]
　The present invention is, branching and insertion apparatus, a network system, transmission method, a control program, and a management apparatus, for example, branching and insertion apparatus used in an optical communication network using the wavelength multiplexing separation techniques, a network system, transmission method, a control program and the management apparatus on.
Background technique
[0002]
　In recent years, the capacity of optical transmission network with the expansion of the service to handle large-volume content such as audio and video, there is an increasing need for long-distance. To meet such requirements, in recent optical transmission network, the introduction of the WDM (Wavelength Division Multiplexing) technique have been studied.
[0003]
　The optical communication by WDM technology, by using the fact that optical signals passing through the optical fiber does not interfere with the optical signals of different wavelengths, in a single optical fiber cable, to form a signal channel for each individual wavelength it can.
[0004]
　Accordingly, in one optical fiber cable, it is possible to increase the amount of information that can be transmitted per unit time significantly. Further, in order to build a more flexible network, terminal device, relay apparatus and, as a branching and insertion apparatus that performs branching and inserting an optical signal at each wavelength of light, the development and the like ROADM (Reconfigurable Optical Add / Drop Multiplexer) the introduction is progressing.
[0005]
　As network technology using the ROADM, it is disclosed in the prior art 1-4. In these ROADM, it attenuates the optical signal from the destination, and adjusts the power difference between the optical signals are multiplexed optical signal after the adjustment.
CITATION
Patent Literature
[0006]
Patent Document 1: JP 2011-040997 Patent Publication
Patent Document 2: JP 2013-123205 Patent Publication
Patent Document 3: JP-T 2013-531909 Patent Publication
Patent Document 4: WO 2009/145118
Summary of the Invention
Problems that the Invention is to Solve
[0007]
　However, the conventional add drop apparatus, so had to fix the amount of attenuation of the optical signal, there is a problem that it is impossible to change the device connected to the add-drop.
[0008]
　An object of the present invention is to provide a branching and insertion apparatus which can arbitrarily change the device connected to the add-drop.
Means for Solving the Problems
[0009]
　Branching and insertion apparatus of the present invention,
the wavelength-multiplexed optical signal received, and at least one to the client device and the at least one network, selectively transferable communication unit for each wavelength constituting the wavelength-multiplexed optical signal , and a control unit for instructing the transfer destination of the optical signal of the predetermined wavelength to the communication unit in accordance with the attribute of the predetermined wavelength of the optical signals included in the wavelength-multiplexed optical signal, wherein the control unit, the to the communication unit, in accordance with the destination of the optical signal of the predetermined wavelength, it directs the attenuation of the optical signal of the predetermined wavelength, the communication unit, the predetermined wavelength in accordance with an instruction of the control unit and damping an optical signal, and to forward the optical signal after attenuation to the transfer destination.
[0010]
　Network system of the present invention,
the wavelength-multiplexed optical signal received for at least one client device and at least one network, and selectively transferable OADM for each wavelength constituting the wavelength-multiplexed optical signal , and a control unit for instructing the transfer destination of the optical signal of the predetermined wavelength in accordance with the attribute of the predetermined wavelength of the optical signals included in the wavelength-multiplexed optical signal to the add drop apparatus, the add drop apparatus attenuates the optical signal of the predetermined wavelength an attenuation amount corresponding to the destination of the optical signal of the predetermined wavelength, and to forward the optical signal after attenuation to the transfer destination.
[0011]
　Transmission method of the present invention,
the wavelength-multiplexed optical signal received for at least one client device and at least one network, and selectively transferring each wavelength constituting the wavelength division multiplexed optical signal, the wavelength-multiplexed light It determines a transfer destination of the optical signal of the predetermined wavelength in accordance with the attribute of the predetermined optical signals of wavelengths included in the signal, and sets the attenuation amount according to the destination of the optical signal of the predetermined wavelength, the setting and to forward to the transfer destination in accordance with the amount of attenuation attenuates the optical signal of the predetermined wavelength.
[0012]
　Control program of the present invention,
the wavelength-multiplexed optical signal received for at least one client device and at least one network, the selectively transferable OADM for each wavelength constituting the wavelength-multiplexed optical signal a control program, a receiving step of receiving the change information of the device to be connected, when the device for the connection is changed, and so comprises a changing step of changing the attenuation amount.
[0013]
　Management device of the present invention,
the wavelength-multiplexed optical signal received for at least one client device and at least one network, and selectively transferable OADM for each wavelength constituting the wavelength-multiplexed optical signal capable of communicating interface, and a controllable control unit with the dropping device through the interface, the control unit, with respect to the dropping device, a predetermined wavelength included in the wavelength-multiplexed optical signal a transfer destination of the predetermined optical signal having a wavelength corresponding to the attribute of the optical signal, and to instruct the attenuation amount of the optical signal of the predetermined wavelength corresponding to the destination of the optical signal of the predetermined wavelength.
Effect of the Invention
[0014]
　According to the present invention, according to the present invention, it is possible to provide a branching and insertion apparatus which can arbitrarily change the device connected to the add-drop.
BRIEF DESCRIPTION OF THE DRAWINGS
[0015]
Is a block diagram showing a configuration of a network system according to a first embodiment of FIG. 1 the present invention.
Is a block diagram showing the configuration of [2] and dropping device according to a first embodiment of the present invention.
3 is a sequence diagram showing an example of a communication network system according to a first embodiment of the present invention.
4 is a block diagram showing a configuration of a communication unit of such branching and insertion apparatus to a second embodiment of the present invention.
5 is a third diagram showing the configuration of a wavelength selective switch according to an embodiment of the present invention.
6 is a diagram showing an example in which the device is to change the connection of the third output port in the wavelength selective switch according to an embodiment of the present invention.
7 is a third diagram showing the configuration of a wavelength selective switch according to an embodiment of the present invention.
8 is a diagram showing an example of apparatus to change the connection of the third input port in the wavelength selective switch according to an embodiment of the present invention.
9 is a block diagram showing a configuration example of a wavelength path communication node apparatus according to a third embodiment of the present invention.
It is a diagram showing a configuration of a fourth network system according to the embodiment of FIG. 10 the present invention.
11 is a block diagram showing a configuration of a management device of the fourth embodiment of the present invention.
DESCRIPTION OF THE INVENTION
[0016]
　(First Embodiment)
　Hereinafter, with reference to the accompanying drawings illustrating a dropping device and a network system according to the first embodiment. Figure 1 is a block diagram showing a configuration of a network system according to a first embodiment of the present invention. In Figure 1, the network system 10 includes a dropping device 11-14, the network 15-19, the end stations 20-21, and a client device 22.
[0017]
　Dropping device 11-14 are connected to each other by a network 15. Also, dropping device 11-14, the network 16-19 respectively, end stations 20-21, are both the client device 22 connected. These connections are, for example, it is preferable to use a cable for transmitting an optical signal such as an optical fiber.
[0018]
　Then, dropping device 11-14, transfers in accordance with the communication path an optical signal received from each device.
[0019]
　And dropping device 11, a network 15, network 16, and connected to the end station 20 and the client device 22. Then, dropping device 11, a network 15, network 16, receives the optical signal from the terminal station 20 and the client device 22. Then, dropping device 11 selects a communication path in accordance with the attribute of the received optical signal and forwards the optical signal to the destination device selected communication path.
[0020]
　Transfer destination device is any device that connects to the add-drop. For example, in the dropping device 11, the transfer destination device, the network 15, network 16, and one of the terminal stations 20 and client device 22.
[0021]
　And dropping device 11, when transferring an optical signal, by adjusting the power of the optical signal to be transferred, and transfers to the apparatus of the transfer destination the optical signal to be transferred. That is, branching and insertion apparatus 11 attenuates the power of the optical signal to be transferred, and transfers the optical signal after attenuation on the destination device.
[0022]
　Device connected to the dropping device 11 (e.g., network 16, terminal station 20 or the client device 22) If is changed, dropping device 11 changes the amount of attenuation. Then, dropping device 11, an attenuation amount of the modified, it attenuates the power of the optical signal to be transferred, and transfers the optical signal after attenuation on the destination device. Attenuation of the optical signal is set and changed by the device units connected to the add-drop 11.
[0023]
　Next will be described the configuration of the OADM. Figure 2 is a block diagram showing the configuration of a branching and insertion apparatus according to a first embodiment of the present invention. 2, the branching and insertion apparatus 11 includes a communication unit 101, a control unit 102. Dropping device of FIG. 2 11 is a device corresponding to the dropping device 11-14 of FIG.
[0024]
　The communication unit 101 is connected to the network 15, also a client device 22, the end station 20, or to connect a network 16 both. Then, the communication unit 101 transfers the network, the client device, the terminal station, or the instruction to the destination device of the control unit 102 of the optical signal received from the network.
[0025]
　Then, the communication unit 101, a network 15, client device 22 receives the optical signal from the terminal station 20 or the network 16, the received optical signal is attenuated by the attenuation amount controller 102 instructs. Then, the communication unit 101 transfers the optical signal after attenuation on the destination device.
[0026]
　Control unit 102 selects a communication path in accordance with the attributes of the received optical signal, instructs the communication unit 101 to transfer the optical signal to the communication path selected. The control unit 102 instructs the attenuation amount set in the apparatus unit to be connected to the communication unit 101 to the communication unit 101.
[0027]
　If the device is connected to the communication unit 101 is changed, the control unit 102 instructs the attenuation amount corresponding to the changed device to the communication unit 101.
[0028]
　Next will be described the procedure of communication with the dropping device and a network and a client device. Figure 3 is a sequence diagram showing an example of a communication network system according to a first embodiment of the present invention.
[0029]
　3, dropping device 11 acquires the attribute information of the optical signals to communicate. For example, dropping device 11 on the basis of the optical signal or an external control signal received, acquires the attribute information of the optical signals to communicate. Then, dropping device 11 selects a communication path in accordance with the attribute of the received optical signal. Then, dropping device 11 communicates an optical signal in a communication path selected.
[0030]
　For example, the received optical signal is, when an optical signal to be transmitted to the client device 22 connected to the add-drop multiplexer 11, and dropping device 11 transmits an optical signal to the client device 22. Further, the optical signal received by, optionally via the network 15 connected to the branching and inserting apparatus 11 is an optical signal to be transmitted to another device, dropping device 11 transmits an optical signal to the network 15. Incidentally, the client device 22, the network 16 of FIG. 1 may be a terminal station 20.
[0031]
　Optical signal transmitted from the add-drop 11 is an optical signal adjusted power by attenuated by dropping device 11. The increased or reduced for increased or reduced and the client device of the network, if the device connected to the add-drop 11 is changed, the attenuation amount of the optical signal is changed. As a result, even if the device to be connected to the branching and insertion apparatus 11 is changed, it is possible to perform communication with the optical signal of appropriate power.
[0032]
　According to the add-drop of the first embodiment, when a device connected to the add-drop is changed, add drop apparatus by changing the attenuation amount of the optical signal to communicate, and dropping the apparatus for connecting devices to be arbitrarily changed.
[0033]
　(Second Embodiment)
　FIG. 4 is a block diagram showing a configuration of a communication unit of the branching and insertion apparatus according to a second embodiment of the present invention. 1 the same components and are denoted by the same numerals and description thereof is omitted. 4, the communication unit 101 includes a branching unit 111, and an insertion portion 112. The communication unit 101 of FIG. 4 is a configuration corresponding to the communication unit 101 of FIG.
[0034]
　Branching unit 111 branches the optical signal received from the network, determines the destination of the optical signal based on the instruction of the control section 102. Then, when the transmission destination of the optical signal is a device of the branch destination to be connected to the branch portion 111 (eg, client device 22 or network 16), the branch unit 111 transmits the optical signal to the branch destination device. The branch unit 111 outputs the other light signal in the insertion portion 112.
[0035]
　For example, if the received optical signal is an optical signal obtained by multiplexing, branch 111, the optical signal multiplexed branches the optical signal of the client device 22 or the network 16 destined to be connected to the branch portion 111 connects attenuated by the attenuation amount set by device, it transmits an optical signal after attenuation to the client device 22 or the network 16 connected to the branch portion 111.
[0036]
　When the branch destination device connected to the branch portion 111 is changed, the branching unit 111 to change the amount of attenuation. The branching unit 111 is attenuated by attenuation amount after changing the power of the optical signal after branching. The branching unit 111 transmits the optical signal to the optical signal after attenuated branch destination device.
[0037]
　Insertion unit 112 receives the optical signal from the client device 22 or the network 16 that connects the insertion portion 112, which attenuates the optical signal received by the attenuation amount set in the device by connecting. Then, the insertion portion 112, the optical signal after attenuation is inserted into an optical signal output from the branching unit 111, and transmits the optical signal after insertion into the network 15.
[0038]
　Then, when the insertion source device to be connected to the insertion portion 112 is changed, the insertion portion 112 changes the amount of attenuation. Then, the insertion portion 112 is attenuated by attenuation amount after changing the power of the optical signal to be transferred, inserting the optical signal after attenuation in the optical signal of the network 15. Attenuation of the optical signal is set and changed by the device units connected to the insertion portion 112.
[0039]
　Here, compared to the dropping device and a conventional device of the second embodiment, in the conventional device, the attenuation of the optical signal is fixed, by changing the device to be connected to the insertion portion 112, the level of the input optical signal changes into the insertion portion 112, is lost balance of the power of the inserted optical signal with the inserted optical signal. Therefore, when one of the power of the optical signal to be inserted to the optical signal to be inserted is too strong, to interfere with the other optical signals, it deteriorates the optical signal.
[0040]
　On the other hand, in add-drop of the second embodiment, even if the device connected to the insertion portion 112 is changed, because changing the attenuation amount in response to the power of the optical signal from the modified device, inserted balance of power of the optical signal to be inserted with the optical signal does not collapse. Therefore, even if any connection to any port can be suppressed one of the optical signals to be inserted to the optical signal to be inserted is deteriorated interfere with the other.
[0041]
　According to the dropping device of the second embodiment, if the device to be connected is changed, by changing the attenuation amount of the optical signal transmitted from the device to be connected, the optical signal to be inserted and can balance the power between the inserted optical signal, it is possible to suppress the influence of interference due to the insertion of the optical signal.
[0042]
　Incidentally, in the above description is set to, further comprising both the insertion portion 112 and branch portion 111, but may be configured to include one of the branching unit 111 may be configured to include the other insertion portion 112.
[0043]
　(Third Embodiment)
　In a third embodiment, an example of applying the OADM to the wavelength selective switch (the Wavelength Selective Switch). Figure 5 is a third diagram showing the configuration of a wavelength selective switch according to an embodiment of the present invention. Wavelength selective switch 200 in FIG. 5 is a structure which can be applied to the branch portion 111 of FIG. 5, the wavelength selective switch 200 includes a wavelength demultiplexer 201, a variable optical attenuator 202A ~ 202D, an optical switch 203A ~ 203D, and multiplexers 204A ~ 204C, and a control unit 205.
[0044]
　Wavelength demultiplexer 201 demultiplexes the optical signal input from the common port in a unit of wavelength. The wavelength demultiplexer 201 outputs to the variable optical attenuators 202A ~ 202D optical signal demultiplexed by the wavelength.
[0045]
　Variable optical attenuators 202A ~ 202D attenuates the optical signal. The variable optical attenuators 202A ~ 202D are optical switches 203A ~ 203D outputs each optical signal after attenuation. Attenuation in the variable optical attenuator 202A ~ 202D is variable, also be determined by an instruction of the control section 205.
[0046]
　Optical switches 203A ~ 203D selects the output destination of the optical signal from the multiplexer 204A ~ 204C outputs.
[0047]
　Multiplexers 204A ~ 204C multiplexes output from the optical switches 203A ~ 203D optical signals, respectively. The multiplexers 204A ~ 204C outputs coupled optical signal to the optical output port A ~ C, respectively.
[0048]
　The control unit 205 instructs the attenuation of the variable optical attenuator 202A ~ 202D, also indicating the selection destination of the optical switches 203A ~ 203D. Select destination optical switches 203A ~ 203D is determined by the routing information from the outside. Incidentally, as shown in FIG. 9 to be described later, when a plurality of routes includes a control unit 205 in route unit, the control unit 102 may control the plurality of control unit 205.
[0049]
　Also, the attenuation amount of the variable optical attenuators 202A ~ 202D are based on the connection destination information of the optical output port A ~ C whose wavelength is outputted is set by the wavelength demultiplexer 201 demultiplexes wavelength units. Here, the connection destination information, which is information about the device and network are connected to the optical output port A ~ C. Then, when the connection destination device of the optical output port has been changed, the control unit 205 changes the attenuation amount of the output port to which the destination devices was changed.
[0050]
　Figure 6 is a diagram illustrating an example of connection destination device may change the output port in a third wavelength selective switch according to an embodiment of the present invention. In FIG. 6, XC indicates that connection is to cross-connect (wavelength cross-connect), DROP shows client device that branches. 6, the wavelength selective switch 200 is the optical output ports A and C connected to the cross-connect, the optical output port B, and connected to the client device that branches.
[0051]
　Here, a target for connection of the optical output port C, when it is changed to the client device that branches from the cross-connect, the control unit 205, a change of the variable optical attenuator 202A ~ 202D attenuation corresponding to the optical output port C It instructs.
[0052]
　This change in attenuation, the power of the optical output port C of the signal has a level appropriate for the client device for branching.
[0053]
　For example: the application of wavelength-selective switch to the insertion portion 112 will be described. Figure 7 is a third diagram showing the configuration of a wavelength selective switch according to an embodiment of the present invention. Wavelength selective switch 300 in FIG. 7 is a structure which can be applied to the insertion portion 112 of FIG. 7, the wavelength selective switch 300 includes a wavelength demultiplexer 301A ~ 301C, and the optical switches 302A ~ 302D, a variable optical attenuator 303A ~ 303D, a multiplexer 304, a control unit 305.
[0054]
　Wavelength demultiplexer 301A ~ 301C demultiplexes the optical signal input from the optical input port A ~ C in a unit of wavelength. The wavelength demultiplexer 301A ~ 301C are respectively an optical signal demultiplexed by the wavelength output to the optical switch 302A ~ 302D.
[0055]
　Optical switches 302A ~ 302D may be output to the variable optical attenuators 303A ~ 303D selects the optical signal output from the wavelength demultiplexer 301A ~ 301C.
[0056]
　Variable optical attenuators 303A ~ 303D attenuates the optical signal input from the optical input port. The variable optical attenuators 303A ~ 303D outputs the optical signal after attenuation to the multiplexer 304. Attenuation in the variable optical attenuator 303A ~ 303D is variable, also be determined by an instruction from the control section 305.
[0057]
　Multiplexer 304 multiplexes the optical signal output from the variable optical attenuator 303A ~ 303D. The multiplexer 304 outputs the coupled optical signal to the common port.
[0058]
　Control unit 305 instructs the attenuation of the variable optical attenuator 303A ~ 303D, also instructs the optical switches 302A ~ 302D selection source. Optical switches 302A ~ 302D of the selection source is determined by the routing information from the outside. Incidentally, as shown in FIG. 9 to be described later, when a plurality of routes includes a control unit 305 in route unit, the control unit 102 may control the plurality of control unit 305.
[0059]
　Also, the attenuation amount of the variable optical attenuators 303A ~ 303D are based on the connection destination information of the input ports A ~ C whose wavelength is input, the attenuation at each wavelength demultiplexed by the wavelength demultiplexer 301A ~ 301C to set. Here, the connection destination information, which is information about the device and network are connected to the input port A ~ C. Then, when the connection destination device in the input port is changed, the control unit 305 changes the attenuation amount of the input ports which connect to the device was changed.
[0060]
　Figure 8 is a diagram illustrating an example of connection destination of the apparatus is the change of the input ports in the wavelength selective switch according to a third embodiment of the present invention. In FIG. 8, XC indicates that connection is to cross-connect (wavelength cross-connect), ADD denotes a client device to be inserted. 8, the wavelength selective switch 300, an optical input port A and C connected to the cross-connect, the optical output port B, and connected to the client device to be inserted.
[0061]
　Here, a target for connection of the optical input port C, when it is changed in the client device for inserting a cross-connect, control unit 305, a change of the variable optical attenuator 303A ~ 303D attenuation corresponding to the optical input port C It instructs.
[0062]
　This change in attenuation, the power of the optical input port C of the signal has a level appropriate for the client device to be inserted.
[0063]
　Thus, according to the add-drop multiplexer of the third embodiment, when the port of the destination device is changed, by changing the attenuation amount of the optical signal corresponding to a device connected to the port it is possible to arbitrarily change the device to be connected, can be effectively utilized limited number of ports of the resource. Further, it is possible to change the device connected to the port arbitrarily, that operates a device connected to the add-drop can be carried out flexibly.
[0064]
　This, it is preferable to apply the wavelength selective switch of the third embodiment in the wavelength path communication node apparatus. Hereinafter, an example of applying a wavelength selective switch in the wavelength path communication node apparatus.
[0065]
　Figure 9 is a block diagram showing a configuration example of a wavelength path communication node apparatus according to a third embodiment of the present invention. 9, the wavelength path communication node apparatus 400, the wavelength cross-connect WXC401, the wavelength cross-connect (Wavelength Cross-Connect) WXC402, an optical receiver 410 and 411, a light transmitting portion 412 and 413, add / drop 420 , and 421, and a concentrator 430. The wavelength path communication node apparatus 400 is intended to exchange client devices 440-443 and the optical signal. The function and operation of each component shown below.
[0066]
　Wavelength cross-connect WXC401 has wavelength selective switch WSS401A, the 401B. Similarly wavelength cross-connect WXC402 has wavelength selective switch WSS402A, the 402B. These wavelength selective switch is comprised of an optical module and a control module having an input WDM signals, and the port switch function to connect to a different output port for each wavelength, the attenuation function of adjusting the transmission light power for each wavelength .
[0067]
　Optical receiver 410 and 411, an optical attenuator includes an optical amplifier, to adjust the power of the optical signal from the route, and outputs an optical signal after the adjustment, the wavelength selective switch WSS401A, to 402A.
[0068]
　Optical transmission unit 412 and 413 includes an optical amplifier, a wavelength selective switch WSS401B, and outputs the route amplifies the optical signal from 402B.
[0069]
　Add / drop 420 has a ODMUX (Optical Demultiplexer) 420A, and the transponder 420B, and OMUX420C. Similarly add / drop 421 has a ODMUX421A, and the transponder 421B, and OMUX421C.
[0070]
　The optical signal output from the wavelength selective switch WSS401A, in ODMUX420A, takes out a signal wavelength assigned to for the client device 440, is output to the client apparatus 440 via the transponder 420B.
[0071]
　The optical signal from the client device 440 is converted into the wavelength assigned transponder 420B, are multiplexed by OMUX420C, it is outputted to the wavelength selective switch WSS401B.
[0072]
　Concentrator 430 has an optical switch 430A, the transponder 430B, and 430C.
[0073]
　Optical switch 430A selects the optical signal to be transmitted from the optical signal received from the wavelength cross-connect WXC401,402 the client device 442, 443, the transponder 430B, the output light signal selected to the client device 442 and 443 via the 430C to.
[0074]
　Further, the transponder 430B, 430C converts the optical signal from the client device 442, 443 to an optical signal suitable for wavelength multiplexing. Then, the optical switch 430A selects one of the wavelength cross-connect WXC401,402, and outputs the optical signal after the conversion to the wavelength cross-connect the selected.
[0075]
　For example, the transmission path a transponder 430B (route P10a, b) branching and insertion of the client device 442 for the signals from the transmission line the transponder 430C (route P20a, b) for branching and insertion of the client device 443 for the signals from the it can also be used, by switching the optical switch 430A, the transmission path a transponder 430C (route P10a, b) branching and insertion of the client device 442 for the signals from the transmission line the transponder 430B (route P20a, b) It can also be used for branching and insertion of the client device 443 for the signals from.
[0076]
　It will now be described connection and operation of the wavelength selection switch for exchanging each of these configurations and optical signals.
[0077]
　WSS WSS401A includes a light receiving portion 410 connected by a common port, ODMUX420A, connects the selected port wavelength selective switch WSS402B and optical switch 430A. Similarly, the wavelength selective switch WSS402A includes a light receiving portion 411 connected by a common port, ODMUX421A, connects the selected port wavelength selective switch WSS401B and optical switch 430A.
[0078]
　The wavelength selective switch WSS401B includes an optical transmission unit 412 connected by a common port, OMUX420C, connects the selected port wavelength selective switch WSS402A and optical switch 430A. Similarly, the wavelength selective switch WSS402B includes an optical transmission unit 413 connected by a common port, OMUX421C, connects the selected port wavelength selective switch WSS401A and optical switch 430A.
[0079]
　That wavelength path communication node apparatus 400 in this embodiment, wavelength selective switch WSS401A as selectively configured for branching the optical signal from the optical receiver 410 and 411, by providing a 402A wavelength of no CDC function ROADM in addition to cross-connect WXC, it implements a plurality of concentrator made of a light switch (aggregator), to implement the CDC function.
[0080]
　The selected port of the wavelength selective switch may be a wavelength selective switch, the concentrator, connected to any client branching or insertion, also changes the connection target.
[0081]
　It will now be described signal processing.
　Wavelength-division-multiplexed optical signal from the route P10b, the signal power at the optical receiver 410 is adjusted is output to the common port of the wavelength selective switch WSS401A. Then, in the wavelength selective switch WSS401A, select the selection port for outputting a wavelength-multiplexed signal to each wavelength, and outputs ODMUX420A connected to the selected port, the optical signal selected to a wavelength selective switch WSS402B or optical switch 430A.
[0082]
　The optical signal output to ODMUX420A, in ODMUX420A, takes out a signal wavelength assigned to for the client device 440, is output to the client apparatus 440 via the transponder 420B.
[0083]
　Further, the optical signal output to the wavelength selective switch WSS402B, in the wavelength selective switch WSS402B, is inserted into the other optical signals, after the power adjustment by the optical transmission unit 413 is sent to the route P20a.
[0084]
　Further, the optical signal output to the optical switch 430A, in the optical switch 430A, then select the optical signal to be transmitted to the client device 442, 443, the transponder 430B, it is output via the 430C to the client device 442, 443.
[0085]
　Thus, the wavelength-multiplexed signal from the route, select the optical signal into each wavelength by the wavelength selective switch, are output to the route or the client device.
[0086]
　Further, the optical signal from the client device is also transponder 430B, is output to the optical switch 430A through 430C, in the optical switch 430A, an optical signal after the conversion to the wavelength cross-connect the selected is output. Then, it is inserted into another optical signal by the wavelength selective switch, is output to the route via the optical transmission unit.
[0087]
　Thus wavelength path communication node apparatus of the present embodiment, the wavelength selective switch an optical signal from the route, the insertion-side wavelength selective switches opposing route, concentrators, at each wavelength in one of ODMUX / OMUX and outputting an optical signal, output by the optimum ATT adjusted based on the input port information, RODAM can configure the wavelength cross-connect and concentrator as a configuration optimum power, you can connect any destination to any port , it can output arbitrary wavelengths, and can be output to an arbitrary route, and it is possible to realize a wavelength path communication node apparatus for conflicts wavelength-route.
[0088]
　Incidentally, it is also possible to replace the wavelength selective switch WSS401A the wavelength cross-connect WXC401 9, the wavelength selective switch WSS402A the wavelength cross-connect WXC402, the splitter.
[0089]
　Further, in FIG. 9, the wavelength selective switch is an example of a 2-way path, to expand the number of ports of the WSS may be changed to route any number. Furthermore, the number of multiplexed wavelengths of the wavelength-multiplexed optical signal to be output to each port may be changed to any number.
[0090]
　Fourth Embodiment
　In the fourth embodiment, will be described an apparatus for controlling a dropping device of the first to third embodiments. Figure 10 is a diagram showing a configuration of a network management system according to the fourth embodiment. 10, the network management system 500 includes a management device 501, and a dropping device 11. Here, the management apparatus 501, for example, NMS (Network Management System) for managing a communication network and network devices is / EMS (Element Management System) and the like.
[0091]
　Management unit 501 accepts the registration of the connection information from the user, it registers the connection information. The management device 501 transmits the connection information to the dropping device 11. Here, if the device connected to the branching and insertion apparatus 11 has accepted the connection information to change, the management apparatus 501 transmits that connection object is changed to dropping device 11.
[0092]
　And dropping device 11 is any add-drop of the first to third embodiments. When receiving the connection information for changing the connection target, and dropping device 11, branching and insertion apparatus 11 changes the attenuation amount of the optical signal to communicate.

[Claim 1]
　Received wavelength-multiplexed optical signal, to at least one client device and at least one network, and selectively transferable communication means for each wavelength constituting the wavelength-multiplexed optical signal,
　included in the wavelength-multiplexed optical signal and a control means for instructing the transfer destination of the optical signal of the predetermined wavelength to the communication means in accordance with the attributes of the optical signal of a predetermined wavelength, a,
　wherein, to said communication means, of the predetermined depending on the destination of the optical signal wavelength, directs the attenuation of the optical signal of the predetermined wavelength,
　said communication means is to attenuate the optical signal of the predetermined wavelength in accordance with an instruction of said control means, damping add drop apparatus to be transferred to the transfer destination optical signal after.
[Claim 2]
　It said communication means, attenuating the wavelength-multiplexed optical signal from the client device or inserted in the destination network through the wavelength-multiplexed optical signal after attenuation by attenuating the wavelength-multiplexed optical signal from the network or the network, to add drop apparatus according to claim 1 that branches to the destination client device or network.
[Claim 3]
　The communication means, the client device or inserting the wavelength division multiplexed optical signal after attenuation by attenuating the wavelength-multiplexed optical signal from the network to the destination network, and attenuates the WDM optical signal from the network to add drop apparatus according to claim 1 that branches to the destination client device or network.
[Claim 4]
　Wherein the communication means includes a plurality of optical input ports, and attenuating means for attenuating the optical signal inputted from said plurality of optical input ports, and the wavelength multiplexing means for an optical signal to the wavelength multiplexing attenuated by said attenuating means, said wavelength comprising output means for transferring the optical signal wavelength-multiplexed in multiplexing means to the transfer destination, and
　said control means branches according to any one of claims 1 to 3, indicating the amount of attenuation for each of the damping means insertion device.
[Claim 5]
　Wherein the communication means includes a wavelength demultiplexing means for demultiplexing a wavelength units through the wavelength-multiplexed optical signal input from said optical input port, an optical switch for selecting one of the demultiplexed optical signal at each wavelength, and multiplexing means for multiplexing the optical signal selected by the optical switch further comprises a,
　the damping means according to claim 4 for attenuating the optical signal selected by the optical switch individually add-drop multiplexer.
[Claim 6]
　Wherein, it is branching and insertion apparatus according to the attenuation in claim 5 can be set at each wavelength that is demultiplexed by the wavelength demultiplexing means.
[Claim 7]
　Said communication means, for attenuating the wavelength-multiplexed optical signal from the network and the wavelength demultiplexing means for demultiplexing a wavelength units, individually attenuation amount set the demultiplexed optical signals by said wavelength demultiplexing means a variable optical attenuating unit, and an optical switch for selecting an optical output port for outputting the optical signal attenuated by the variable optical attenuating unit, and multiplexer for multiplexing the optical signal from the optical switch in an optical output port unit , branching and insertion apparatus according to any one of claims 1 to 3, having a.
[8.]
　Wherein, it is branching and insertion apparatus according to the attenuation in claim 7 can be set at each wavelength that is demultiplexed by the wavelength demultiplexing means.
[Claim 9]
　Received wavelength-multiplexed optical signal, to at least one client device and at least one network, and selectively transferable OADM for each wavelength constituting the wavelength-multiplexed optical signal,
　the wavelength-multiplexed optical signal and a control unit for instructing the transfer destination of the optical signal of the predetermined wavelength to said OADM according to the attribute of an optical signal of a predetermined wavelength included,
　the add drop apparatus, the light of the predetermined wavelength network system attenuates the optical signal of the predetermined wavelength, and transfers the optical signal after attenuation on the transfer destination in attenuation amount according to the destination of the signal.
[Claim 10]
　The add drop apparatus, the client device or inserted in the destination network through the wavelength-multiplexed optical signal after attenuation by attenuating the wavelength-multiplexed optical signal from the network, or the wavelength-multiplexed optical signal from the network network system according to claim 9, attenuated to branch to destination client device or network.
[Claim 11]
　The add drop apparatus, inserted in the destination network through the wavelength-multiplexed optical signal after attenuation by attenuating the wavelength-multiplexed optical signal from the client device or the network, and the wavelength-multiplexed optical signal from the network network system according to claim 9, attenuated to branch to destination client device or network.
[Claim 12]
　The add drop apparatus, a plurality of optical input ports, and attenuating means for attenuating the optical signal inputted from said plurality of optical input ports, and the wavelength multiplexing means for an optical signal to the wavelength multiplexing attenuated by said attenuating means, the network system according to any one of claims 9 to 11 having an output means for transferring an optical signal wavelength-multiplexed by the wavelength multiplexing means to the transfer destination, and a control means for instructing the attenuation for each of the attenuating means.
[Claim 13]
　The add drop apparatus, the wavelength demultiplexing means for demultiplexing a wavelength units through the wavelength-multiplexed optical signal input from said optical input port, an optical switch for selecting one of the demultiplexed optical signal at each wavelength further comprises a, a multiplexing means for multiplexing the optical signal selected by the optical switch,
　the damping means according to claim 12 for attenuating the optical signal selected by the optical switch individually network system.
[Claim 14]
　Wherein, the network system according to claim 13 which is capable of setting the amount of attenuation at each wavelength that is demultiplexed by said wavelength demultiplexing means.
[Claim 15]
　The add drop apparatus, the attenuation individually by the wavelength demultiplexing unit of the WDM optical signal demultiplexed by wavelength basis, the attenuation amount set demultiplexing optical signals at said wavelength demultiplexing means from the network to a variable optical attenuating unit, the variable light and an optical switch for selecting an optical output port for outputting the optical signal attenuated by the attenuating means, a multiplexer for multiplexing the optical signal from the optical switch in an optical output port unit network system according to any one of claims 9 to 11 having the, further.
[Claim 16]
　Wherein the control device, a network system according to claim 15 which is capable of setting the amount of attenuation at each wavelength that is demultiplexed by said wavelength demultiplexing means.
[Claim 17]
　Received wavelength-multiplexed optical signal, to at least one client device and at least one network, and selectively transferring each wavelength constituting the wavelength-multiplexed optical signal,
　a predetermined wavelength included in the wavelength-multiplexed optical signal It determines a transfer destination of the predetermined optical signal of the wavelength in accordance with an attribute of the optical signal,
　and sets the attenuation amount according to the destination of the optical signal of the predetermined wavelength,
　in response to said attenuation and said set transmission method to be transferred to the transfer destination to attenuate the optical signal of a predetermined wavelength.
[Claim 18]
　Destination the client device or inserting the wavelength division multiplexed optical signal after attenuation by attenuating the wavelength-multiplexed optical signal from the network to the destination network, or attenuates the WDM optical signal from the network transmission method according to claim 17 which branches to a client device or network.
[Claim 19]
　Said client device or inserted in the destination network through the wavelength-multiplexed optical signal after attenuation by attenuating the wavelength-multiplexed optical signal from the network, and the transfer destination by attenuating the wavelength-multiplexed optical signal from the network transmission method according to claim 17 which branches to a client device or network.
[Claim 20]
　Received wavelength-multiplexed optical signal, to at least one client device and at least one network, a control program for selectively transferable OADM for each wavelength constituting the wavelength division multiplexed optical signals,
　connected a receiving step of receiving the change information of the device which,
　when the device for the connection is changed, a non-transitory computer readable medium having a control program is stored comprising a changing step of changing the attenuation amount.
[Claim 21]
　Received wavelength-multiplexed optical signal, to at least one client device and at least one network, and can communicate interface with selectively transferable OADM for each wavelength constituting the wavelength-multiplexed optical signal,
　the and a control means capable of controlling the dropping device via the interface,
　said control means, to said add drop apparatus, according to the attribute of an optical signal of a predetermined wavelength included in the wavelength-multiplexed optical signal the predetermined and destination of the optical signal of the wavelength, the predetermined control device which instructs the attenuation amount of the optical signal of the predetermined wavelength corresponding to the destination of the optical signal wavelength.