JP5276929B2 - Supervisory control device and program thereof - Google Patents

Description

  The present invention relates to a monitoring control device and a program, and more particularly, to a monitoring control device connected to a wavelength multiplexing OADM (Optical Add Drop Multiplexer) and a program thereof.

  With the recent rapid spread of broadband, large-capacity and long-distance optical communication devices are required. As means for realizing a large capacity, an optical wavelength division multiplexing (WDM) system has been developed in which a plurality of optical signals having different wavelengths are multiplexed and communicated on one optical fiber. In order to realize a long distance, the communication network is configured using an OADM, an optical amplifier (1R), a regenerative repeater (3R), and the like.

  In a conventional optical transmission network, there is a technique for designing a network by determining reachability of an optical path to which a regenerative repeater is applied. For this purpose, the number of regenerative repeaters required based on the amount of noise in the network model when no regenerative repeater is used is calculated in advance by the network design device, and regenerative relay is performed based on the number of regenerative repeaters applied. A method for determining a device application location (Patent Document 1) and a method for determining whether or not a path can be transmitted (Patent Document 2) correspond to a network model in which a regenerative repeater is arranged.

  However, in the prior art, when an optical path determined by network design is opened, the influence on the optical path when a setting is mistaken is not examined. For this reason, a safer application method of the regenerative repeater in the network is required.

JP 2004-048477 A JP 2006-042279 A

  By applying a regenerative repeater, it is possible to avoid limitations on transmission distance and transmission band. However, regenerative repeaters are more expensive than optical amplifiers. Furthermore, one optical amplifier amplifies optical signals for all wavelengths in one unit, but a regenerative repeater can be applied only to optical signals for one wavelength per unit. Using a method of preparing whether to apply regenerative repeaters for all wavelengths is very costly and is not practical. In addition, since setting whether to apply the regenerative repeater is performed for each optical path of each wavelength, a setting error is likely to occur.

  In the optical transmission design, the optical signal-to-noise ratio OSNR (Optical Signal-to-Noise Ratio) is designed to be a sufficiently large value. A problem that occurs when a regenerative repeater is not applied to an optical path having a transmission distance that is too long to transmit unless the regenerative repeater is applied will be described with reference to FIG. Here, FIG. 1 is a diagram for explaining a setting error of the regenerative repeater. In particular, FIG. 1A shows a state in which the regenerative repeater is applied at the previous stage to the wavelength λn, and FIG. 1B shows a state in which the regenerative repeater is not applied at the previous stage to the wavelength λn due to a setting error.

  In FIG. 1, the vertical axis represents the light level, and the horizontal axis represents the wavelength. In the optical signal 400 # 1, light having the center wavelength λn−1 is cut out by the filter 500 # 1 in the optical add / drop section. Similarly, in the optical signal 400 # 2, light having the center wavelength λn is cut out by the filter 500 # 2 in the optical add / drop section.

  When the regenerative repeater is not applied to the optical path (λn) to which the regenerative repeater is applied in the preceding OADM node, the OSNR of the wavelength λn becomes a value smaller than expected. Each filter 500 has an overlapping portion (A portion). For this reason, the optical signal 400 # 2 having a very small OSNR is buried in noise when attempting to cut out the light having the center wavelength λn by the filter 500 # 2 in the optical add / drop unit.

  Further, the filter 500 # 1 used to cut out the optical signal 400 # 1 having the center wavelength λn−1 cannot remove the noise in the A part, and the noise is mixed into the optical signal 400 # 1 having the λn−1. . If the amount of mixed noise is large, even an optical signal of an optical path having a wavelength other than the setting error wavelength is erroneous.

  The influence when the setting of the regenerative repeater is wrong will be described with reference to FIGS. Here, FIG. 2 and FIG. 3 are diagrams for explaining the configuration of the optical network and the OSNR change at each node. FIG. 2A and FIG. 3A are block diagrams illustrating the configuration of an optical network. The optical network constitutes a linear network composed of OADM nodes 100 # 4 to 100 # 8. In this optical network, the optical path 200 # λ2 missing from the OADM node 100 # 4 to the OADM node 100 # 8 and the optical path 200 # λ1 added by the OADM node 100 # 5 and dropped by the OADM node 100 # 8 Pay attention to. In FIG. 2A, the optical path 200 # λ2 is regeneratively relayed by the OADM node 100 # 6. On the other hand, in FIG. 3A, the optical path 200 # λ2 is not applied with regenerative relay in the OADM node 100 # 6. In FIG. 2A, the OADM node 100 # 6 is represented by a double circle, which means that the node is capable of regenerative relay. This is common to other drawings.

  2 (b) and 2 (c) and FIGS. 3 (b) and 3 (c) are graphs in which the vertical axis represents OSNR and the horizontal axis represents OADM node. 2 (b) and 3 (b) are graphs for the wavelength λ1, and FIGS. 2 (c) and 3 (c) are graphs for the wavelength λ2. In the figure, the OSNR threshold value indicating whether there is a possibility of mistaking the signal of the own wavelength is X, and the OSNR threshold value indicating whether there is a possibility of mistaking the signal of other wavelengths is Y. The values of threshold values X and Y are fixed values held by OpS.

  Consider a situation in which the optical path 200 # λ2 of wavelength λ2 is newly opened in the above-described network while the optical path 200 # λ1 of wavelength λ1 has been opened. In FIG. 2, when the optical path 200 # λ2 is opened, a regenerative repeater that performs identification and regeneration of the wavelength λ2 is applied to the OADM node 100 # 6. By applying the regenerative repeater, as shown in FIG. 2C, the OSNR of the optical path 200 # λ2 is recovered at the OADM node 100 # 6. As a result, the OSNR of the optical signal is maintained at a value equal to or higher than X, and a normal optical signal is successfully transmitted.

  With reference to FIG. 3, a situation where a new optical path 200 # λ2 is newly opened without applying a regenerative repeater will be described. In FIG. 3C, the OSNR of the optical path 200 # λ2 continues to deteriorate, and when it exceeds the OADM node 100 # 6, the OSNR falls below X, and an error occurs in the optical signal. Furthermore, when the OADM node 100 # 7 is exceeded, the OSNR of the optical path 200 # λ2 falls below the threshold Y, and the noise of the optical signal having the wavelength λ2 is mixed into the optical signal having the wavelength λ1. Due to this noise, the OSNR of the optical path 200 # λ1 falls below the threshold value X, and an error occurs in the optical signal.

  If the application setting of the regenerative repeater is mistaken in this way, there is a possibility of mistaking not only its own signal but also a signal of another wavelength. In particular, if an error occurs in the signal of an optical path of another wavelength that has already been opened, it will lead to a larger accident than when the newly opened optical path does not reach. Furthermore, in recent years, with the increase in the density of wavelength division multiplexing, the interval between wavelengths has narrowed, and the possibility of affecting other wavelengths has increased.

  According to the present invention, when an optical path is set to be opened by the supervisory control device, it is determined whether or not an error occurs in a signal of a newly opened optical path and an error may occur in an optical path signal of another wavelength. Thus, a monitoring control device and a program that reduce the risk of setting errors are provided.

  The above-described problem is related to the type information of the optical amplifier provided in the optical add / drop multiplexer, connected to the plural optical add / drop multiplexers, controlling the setting of the optical path based on the topology of the plural optical add / drop multiplexers. Based on the performance information of the optical amplifier, the topology, and the position information of the regenerative repeater, the first predicted information that a failure occurs in the optical path to be opened, and the failure in the already opened path due to the opening of the optical path to be opened This can be achieved by the monitoring and control device including the transmission possibility determination unit that generates the second prediction that the occurrence of the above.

  In addition, a computer connected to a plurality of optical add / drop multiplexers has an optical path setting control unit that controls the setting of an optical path based on the topology of the plural optical add / drop multiplexers, and an optical provided in the optical add / drop multiplexer. Based on the type information of the amplifier, the performance information of the optical amplifier, the topology, and the position information of the regenerative repeater, the first expected information in which a failure occurs in the optical path to be opened, and the existing information on the opening of the optical path to be opened. This can be achieved by a program that functions as a transmission permission / inhibition determination unit that generates a second prediction that a failure occurs in the open path.

  It is possible to provide a monitoring control device and a program that reduce the risk of setting errors.

Hereinafter, embodiments of the present invention will be described with reference to the drawings using examples. The same reference numerals are assigned to substantially the same parts, and the description will not be repeated .

  The configuration of the optical network will be described with reference to FIG. Here, FIG. 4 is a block diagram of an optical network. In FIG. 4, an optical network 600 includes a high-density optical wavelength division multiplexing (DWDM) ring network including four OADM nodes 100. Each OADM node 100 is connected by an interoffice optical fiber 550.

  The OADM node 100 is provided with an OADM unit 110, a transponder 120, and a regenerative repeater 130 as necessary, and an optical path 200 is opened by a monitoring control device (OpS: Operation System) 300. The client signals input / output to / from the ports of the transponder 120 and the regenerative repeater 130 include 10 GbE, GbE signals, STM-64 / OC-192, STM-16 / OC-48, STM-4 / OC-12, and the like. Is housed.

  In addition to the main line, the OADM node 100 has an OSC (Optical Supervisory Channel) function for a supervisory control line. The OpS 300 and the OADM node 100 are logically network-connected using the OADM node 100 connected to a DCN (Data Communication Network) 450 as a gateway. Using this OSC, the OpS 300 remotely monitors and controls the OADM node 100 using a TL1 command or the like.

  With respect to the two connection ports with the inter-office optical fiber 550 in the OADM unit 110, one is defined as “West direction” and the other as “East direction”.

  The configuration of the OADM node will be described with reference to FIGS. Here, FIG. 5 and FIG. 6 are functional block diagrams of the OADM node. In FIG. 5, the OADM node 100A includes an optical amplification unit 150, an optical add / drop unit 170, an IF unit 180, and an in-device monitoring control unit 160.

  The optical amplifying unit 150 collectively amplifies the wavelength multiplexed signal light to a signal light intensity that can be transmitted between stations without converting it into an electrical signal. The optical add / drop unit 170 demultiplexes the wavelength multiplexed signal light received from the optical amplifying unit 150, and after branching, inserting, or passing through any wavelength, performs wavelength multiplexing again and transmits it to the optical amplifying unit 150.

  The IF unit 180 has a transponder 120 for each wavelength. The transponder 120 converts the client signal received from the port into an appropriate signal format, signal light intensity, and signal light wavelength for wavelength multiplexing, and transmits the converted signal to the optical add / drop unit 170. Also, the transponder 120 converts the arbitrary wavelength separated by the optical add / drop unit 170 into an appropriate signal format, signal light intensity, and signal light wavelength for connection to an external terminal device (not shown), and transmits the signal to the port. .

  The in-device monitoring control unit 160 collects alarms and event notifications detected by the optical amplifying unit 150, the optical add / drop unit 170, and the IF unit 180, and notifies the OpS 300 of the results. Further, the in-device monitoring control unit 160 performs device setting under the control from the OpS 300.

  In FIG. 6, the OADM node 100 </ b> B includes a regenerative repeater 130 in the IF unit 180. The regenerative repeater 130 converts the optical signal wavelength-separated by the optical add / drop unit 170 into an electrical signal, performs identification / reproduction, converts the optical signal into an optical signal, and transmits the optical signal to the optical add / drop unit 170. Note that the transponder 120 and the regenerative repeater 130 may be provided in the IF unit 180. The output of the regenerative repeater 130 may be used as the transponder 120.

  With reference to FIG. 7, the configuration of the optical amplifying unit will be described. Here, FIG. 7 is a hardware block diagram of the optical amplification unit. In FIG. 7, the optical amplification unit 150 includes two optical amplifiers 155, an OSC optical demultiplexer 151, an OSC optical multiplexer 152, and a variable optical attenuator 153.

  The reception optical amplifier 155 # 1 and the transmission optical amplifier 155 # 2 collectively amplify the wavelength multiplexed signals. The reception optical amplifier 155 # 1 includes a variable optical attenuator 153 in the input unit, operates by automatic level control, and adjusts the input level to a predetermined level. The OSC optical demultiplexer 151 and the OSC optical multiplexer 152 demultiplex / multiplex the main signal and OSC, and transmit / receive to / from the in-device monitoring control unit 160, and monitor control from the in-device monitoring control unit 160. Is possible. The OSC is regenerated and relayed for each node section.

The configuration of the regenerative repeater will be described with reference to FIG. Here, the figure Ru functional block diagram der regenerator. In FIG. 8, the regenerative repeater 130 includes two line optical modules 135, a clock extraction unit 131, a TxPLL 133, and an OTU termination / generation unit 132.

  The line optical module 135 performs optical / electrical conversion on the signal branched from the optical add / drop unit 170. The clock extraction unit 131 performs identification reproduction and retiming on the electric signal from the line optical module 135. The TxPLL 133 generates a transmission line clock synchronized with the reception line clock. The OTU termination / generation unit 132 passes OPU / ODU of the OTN frame signal and performs OTU termination / generation.

  The Line optical module 135 converts the OTN frame signal from the OTU termination / generation unit 132 into a signal light wavelength and signal light intensity for wavelength multiplexing, and transmits the signal light to the optical add / drop unit 170.

  Application of the optical amplifier 155 and the regenerative repeater 130 in the optical transmission network will be described with reference to FIG. Here, FIG. 9 is a diagram for explaining the configuration and signal waveforms of the optical transmission network.

  In FIG. 9, in an optical transmission network composed of OADM nodes 100 # 1, 100 # 2, and 100 # 3, only the optical amplifier 155 is applied to the OADM nodes 100 # 1 and 100 # 2, and the OADM node 100 The regenerative repeater 130 is also applied to # 3. That is, the network in FIG. 9A is amplification by only an optical amplifier, and the network in FIG. 9B is amplification by an optical amplifier and a regenerative repeater. 9 (c) to 9 (f), the vertical axis represents the optical level, the horizontal axis represents the wavelength, and the spectrum at the network position.

  The spectrum after the long distance transmission (FIG. 9D) is weaker than the spectrum immediately after being transmitted from the OADM node 100 # 1 (FIG. 9C). The optical level is recovered by the effect of the optical amplifier 155 of the OADM node 100 # 2, but noise is also amplified at the same time. For this reason, with only the optical amplifier, the OSNR deteriorates as shown in FIG.

  The OADM node 100 # 3 is a node that employs the regenerative repeater 130. By using three regenerative repeaters 130, the optical signal is once converted into an electrical signal, then identification reproduction is performed, and the optical signal is converted into an optical signal, thereby recovering the OSNR as shown in FIG. 9 (f). can do.

  The OpS 300 is a general information processing apparatus such as a PC / WS, and software for managing the optical path 200 is installed and activated by the user. The configuration of OpS will be described with reference to FIG. Here, FIG. 10 is a functional block diagram of OpS.

  In FIG. 10, OpS 300 is operated by a user using an input unit 340 and an output unit 350. The arithmetic processing unit 360 performs arithmetic operations necessary for monitoring control of the OADM node 100 and holds necessary information in the database unit 380. When executing a command to the OADM node 100, the arithmetic processing unit 360 transmits a communication command to the communication processing unit 370, thereby realizing communication between the OpS 300 and the OADM node 100. The arithmetic processing unit 360 includes a path opening execution unit 365, a transmission permission / inhibition determination unit 361, an already opened path influence determination unit 362, an opening permission / inhibition determination unit 363, and a dialog display unit 364.

  The path opening execution unit 365 controls the branching of the optical add / drop unit 170 of each OADM node 100 by communicating with the OADM node 100 and opens the optical path 200.

  The transmission availability determination unit 361, the already opened path influence determination unit 362, the opening availability determination unit 363, and the dialog display unit 364 are based on the path opening process A00 (FIG. 18), the path transmission availability determination B00 (FIG. 19), and the already opened path, respectively. Responsible for influence determination D00 (FIG. 22) and dialog display section C00 (FIG. 24). For this reason, it mentions later using FIGS. 18-24.

  The hardware configuration of OpS will be described with reference to FIG. Here, FIG. 11 is a hardware block diagram of OpS. In FIG. 11, an OpS 300 includes a central processing unit (CPU) 310, a main storage device (main memory) 320, a network card (NIC: Network Interface Card) 330, an input / output unit 315, and an auxiliary device interconnected by an internal bus 325. The storage unit 305 includes an input unit 340 connected to the input / output unit 315 and an output unit 350.

As is clear from the comparison between FIG. 10 and FIG. 11, the functions 361 to 365 of the arithmetic processing unit 360 are realized by the CPU 310 executing programs on the main storage device 320.
The table information held in the database unit 380 by the OpS 300 in order to realize the management of the optical path 200 to which the regenerative repeater is applied in the OpS 300 will be described hereinafter.

  With reference to FIG. 12, a network configuration which is a premise of the table information will be described. Here, FIG. 12 is a block diagram illustrating a network configuration. In FIG. 12, a network 650 is a ring network including five OADM nodes 100. In FIG. 12, node names A to E are assigned to the OADM node 100, respectively. The network 650 includes a clockwise optical path 200 # 1 having an OADM node A as an add node and an OADM node C as a drop node, and a counterclockwise optical path 200 having an OADM node B as an add node and OADM node D as a drop node. # 2 is defined. The OADM node A is a node capable of regenerative relay.

  At each OADM node 100, after the hard connection such as the connection of the optical fiber 550, the package mounting of the transponder 120, the package mounting of the regenerative repeater 130, the fiber connection in the apparatus, etc. is performed, the user connects the ring to the OpS 300. The topology information of the OADM node 100 to be configured is registered as a topology information table in an arbitrary order. This topology information table will be described with reference to FIG. Here, FIG. 13 is a diagram for explaining the topology information table. In FIG. 13, the topology information table T00 includes the node name T01, the IP address T02, the node name T03 adjacent to the West side, and the node name T04 adjacent to the East side of each OADM node 100.

  When the path opening process is performed, the OpS 300 adds the opened path information to the already opened path information table held by itself. On the other hand, when the path deletion process is performed, OpS 300 deletes the deleted path information from the already-opened path information table. The already opened path information table will be described with reference to FIG. Here, FIG. 14 is a diagram for explaining an already opened path information table. In FIG. 14, the opened path information table T10 includes a path name T11, a wavelength T12, a start node T13, an end node T14, a path direction T15, and a regenerative repeater application node T16.

  The OpS 300 holds performance information (fixed value) for each optical amplifier type as an optical amplifier performance information table. The optical amplifier performance information table will be described with reference to FIG. Here, FIG. 15 is a diagram for explaining the optical amplifier performance information table. In FIG. 15, the optical amplifier performance information table T20 includes an optical amplifier type T21, an output light level P T22, a noise figure NF T23, and a gain G T24.

  The device information table will be described with reference to FIG. Here, FIG. 16 is a diagram for explaining the device information table. In FIG. 16, FIG. 16A is an apparatus information table related to the optical path 200 # 1. On the other hand, FIG. 16B is a device information table related to the optical path 200 # 2. The OpS 300 communicates with the OADM node 100, refers to the node name T31, and includes a device information table composed of the reception optical amplifier type T32 and the transmission optical amplifier type T33 installed in each OADM node 100. Create T30.

  A screen for managing an optical path in OpS will be described with reference to FIG. Here, FIG. 17A is an Ops optical path management screen. In FIG. 17A, a path management screen G00 is a screen displayed on the output unit 350 of OpS300. The path management screen G00 includes a field G07 that displays the opened state of the optical path 200 and a field G08 that displays detailed information of the opened path.

  The path management screen G00 displays the OADM node 100 constituting the ring with an icon G01. Each icon G01 is assigned a node name and a West / East direction. Further, the route G05 of the optical path 200 is displayed. In the OADM node 100 to which the regenerative repeater 130 is applied, the return path G06 is displayed.

  In the field G07, an open button G02 and a delete button G03 are provided. Upon receiving the pressing of the opening button G02 by the user, the OpS 300 performs a path opening process. On the contrary, by accepting the pressing of the delete button G03, the OpS 300 performs a path deletion process.

  FIG. 17B is an Ops path establishment dialog screen. The path opening dialog screen G10 is a screen for opening a new path. The path opening dialog screen G10 is displayed by the OpS 300 when the pressing of the opening button G02 is accepted in FIG. 17A. The path opening dialog screen G10 includes a wavelength input unit G11, a start node input unit G12, an end node input unit G13, a direction input unit G14, a regenerative repeater setting unit G15, and an open button G16. OpS300 accepts input from the user to each input unit, setting unit G11 to G15, and pressing of open button G16.

  17C and 17D are Ops confirmation screens. 17C and 17D, the confirmation screen G20 displays a message display part G23, a Yes / OK button G21, and a No button G22 as necessary. The confirmation screen G20 is a warning / confirmation screen for user settings. In particular, the warning screen G20B cannot be continued as it is because it affects other wavelength paths.

  The path opening process will be described with reference to FIG. Here, FIG. 18 is a flowchart of path establishment. In FIG. 18, OpS300 displays a path management screen G00. OpS300 accepts the pressing of the opening button G02 by the user, starts the path opening process A00, and displays the path opening dialog G10. The OpS 300 accepts the application of the wavelength, start point node, end point node, direction, and regenerative repeater of the optical path 200 to be newly opened by the user (A02). At this time, the OpS 300 makes it possible to select a plurality of zero or more nodes on the screen G15 and to select one item for the other screens.

  The OpS 300 performs transmission permission determination B00 of the newly opened path (A03 # 1). Details of the transmission permission / inhibition determination B00 will be described later with reference to FIG. The OpS 300 uses the topology information table T00 (FIG. 13) and the already opened path information table T10 (FIG. 14) that the OpS 300 owns, and information on the already opened optical path 200 whose route overlaps with the newly opened optical path 200. Is acquired (A04).

  The process of determining whether or not the paths of the two optical paths 200 are overlapped is performed by the OpS 300 as follows. First, the OpS 300 specifies a route for each of the two optical paths 200 to be compared. The OpS 300 displays the names of the start and end nodes of the optical path 200, and information on the direction of the path (in the case of a newly opened path, information selected by the user in the path opening dialog G10, in the case of an already opened path, already opened Reference is made to the path information table T10 (refer to OpS300 in FIG. 14), the node name T01 in the topology information table T00 (FIG. 13) possessed by OpS300, the adjacent node T03 on the West side, and the adjacent node T04 on the East side. Then, all the OADM nodes 100 serving as a route are specified. When two or more same OADM nodes 100 are included in the specified OADM node 100 that is a route for each of the two optical paths 200, the OpS 300 determines that the routes of the two optical paths 200 overlap. do.

  Specifically, the OpS 300 uses the information selected by the user in the path opening dialog G10 and the topology information table T00 (FIG. 13) held by the OpS 300 to change the path of the optical path 200 # 2 from B → A → E. → D is specified. Subsequently, the OpS 300 specifies that the path of the optical path 200 # 1 is A → B → C using the already-opened path information (FIG. 14) and the topology information table T00 (FIG. 13) held by itself.

  The OADM nodes 100 that are paths of the optical path 200 # 1 are nodes A, B, and C, and the OADM nodes 100 that are paths of the optical path 200 # 2 are nodes B, A, E, and D. Since both include two identical OADM nodes 100 (nodes A and B), the OpS 300 determines that the paths of the optical path 200 # 1 and the optical path 200 # 2 overlap.

  Next, the OpS 300 determines whether there is an already opened path that overlaps routes that have not been determined (A05). When YES, the influence determination D00 of the already opened path is performed (A03 # 2). Details of the influence determination D00 of the already opened path will be described later with reference to FIG.

  When the determination of A05 is NO, the OpS 300 displays a confirmation dialog G20 in the dialog display process C00 from the determination results of A03 # 1 and A03 # 2 (A06). The OpS 300 accepts a button press by the user (A07). The OpS 300 determines whether the pressed button is a Yes button (A08).

When the user presses the Yes button (A08: YES), the OpS 300 transmits a command necessary for path establishment to each OADM node 100 (A09). The OpS 300 adds information on the newly opened path to the already opened path information (FIG. 14) held by the OpS 300 (A10), and ends the path opening process.
When the user presses the A08 button with the No button or the OK button, the OpS 300 ends the path opening process.

  18 will be described with reference to FIG. Here, FIG. 19 is a flowchart of the path transmission availability determination process. In FIG. 19, OpS 300 first includes information G14 indicating the names of start and end nodes G12 and G13 of the optical path 200 to be opened and the direction of the path selected by the user in the path opening dialog G10, and topology information held by OpS 300. By referring to the node name T01 of the table T00 (FIG. 13), the West side adjacent OADM node T03, and the East side adjacent OADM node T04, all the OADM nodes 100 serving as paths are specified.

  The OpS 300 acquires device information held by the OADM node 100 by performing communication using the IP address T02 that can be referred to from the node name T01 in the identified OADM node 100, as shown in FIG. The information of the transmission optical amplifier type T33 of the start node, the reception optical amplifier type T32 of the relay node, the transmission optical amplifier type T33, and the reception optical amplifier type T32 of the end node is acquired (B02). If the optical path 200 and the OADM node 100 are determined, the corresponding optical amplifier 155 is uniquely determined.

  Next, for each optical amplifier 155, the OpS 300 refers to the optical amplifier type T21 by using the optical amplifier performance information table T20 (FIG. 15), and outputs optical level P T22, noise figure NF T23, gain G T24. To get. From the acquired information and the regenerative repeater application position G15 selected by the user in the path opening dialog G10, the OpS 300 calculates the optical signal-to-noise ratio OSNR for each optical amplifier 155 using the following equation (B03). ).

ＯｐＳ３００は、各光増幅器１５５毎のＯＳＮＲより、ノードＸ１→Ｘ２→…→Ｘｎの累計ＯＳＮＲＸ１＿Ｘｎを以下の式（２）を用いて算出する（Ｂ０４）。

The OpS 300 calculates the total OSNRX1_Xn of the nodes X1 → X2 →... → Xn from the OSNR for each optical amplifier 155 using the following equation (2) (B04).

ＯＳＮＲは、再生中継器１３０の適用により初期化されるため、再生中継器１３０適用ノード毎に区切った区間の累積ＯＳＮＲを考える必要がある。ＯｐＳ３００は、以下の式（３）を用いて、各区間の累積ＯＳＮＲの中で最小のもの（最も誤りが起きる可能性が高い値）をパス全体のＯＳＮＲＰＡＴＨとし、これを用いて判定を行う。

Since the OSNR is initialized by the application of the regenerative repeater 130, it is necessary to consider the accumulated OSNR of the section divided for each regenerative repeater 130 application node. The OpS 300 uses the following formula (3) to determine the smallest OSNR value (the value most likely to cause an error) in the accumulated OSNR of each section as the OSNRPATH of the entire path, and use this to determine.

自身の信号を誤らせる可能性があるかの閾値をＸとし、他波長の信号を誤らせる可能性があるかの閾値をＹとする。閾値Ｘ、Ｙの値はＯｐＳ３００が保有する固定値である。ＯｐＳ３００は、ＯＳＮＲＡＬＬを閾値ＸおよびＹと比較することで判定を行う。ＯｐＳ３００は、ＯＳＮＲＡＬＬ≦Ｙか判定する（Ｂ０５）。ＹＥＳであれば、ＯｐＳ３００は、光パス２００が他波長の信号および自波長の信号を誤らせると判定し（Ｂ０６）、終了する。Ｂ０５がＮＯのとき、ＯｐＳ３００は、ＯＳＮＲＡＬＬ≦Ｘか判定する（Ｂ０７）。ＹＥＳであれば、光パス２００自身の信号を誤らせると判定して（Ｂ０８）、終了する。Ｂ０７でＮＯのとき、ＯｐＳ３００は、光パス２００は信号を誤らせないと判定し（Ｂ０９）、伝送可否判定Ｂ００を終了する。

Let X be a threshold value indicating whether there is a possibility of misleading its own signal, and Y denote whether there is a possibility of misleading signals of other wavelengths. The values of the threshold values X and Y are fixed values held by the OpS 300. OpS 300 makes a determination by comparing OSNRALL with threshold values X and Y. The OpS 300 determines whether OSNRALL ≦ Y (B05). If YES, the OpS 300 determines that the optical path 200 misleads a signal of another wavelength and a signal of its own wavelength (B06), and ends. When B05 is NO, the OpS 300 determines whether OSNRALL ≦ X (B07). If YES, it is determined that the signal of the optical path 200 itself is erroneous (B08), and the process ends. If NO in B07, the OpS 300 determines that the optical path 200 does not make a signal error (B09), and ends the transmission permission / inhibition determination B00.

Here, the threshold values X and Y will be described. The threshold value X means that when wavelength multiplexed signal light is transmitted by a plurality of nodes, all signal lights are transmitted satisfying a predetermined bit error rate (hereinafter referred to as BER. As a numerical value, for example, BER = 10 ^ -12). This is the minimum OSNR value required for. The threshold value X is determined from the following parameters.
(A) OSNR tolerance of a single transponder 120: minimum OSNR required to satisfy BER = 10 ^ -12 when directly connected between the transceivers of the transponder 120
(B) OSNR penalty due to the filter of the OADM node 100: The OSNR tolerance against (a) due to the wavelength spectrum of the transponder 120 being cut by passing through the OADM node 100 in a plurality of stages with respect to the transponder 120 of (a). Degradation amount (c) OSNR penalty due to nonlinear effect in optical fiber transmission line: Crosstalk and waveform distortion caused by nonlinear effects such as four-wave mixing and cross-phase modulation effect when wavelength multiplexed light is propagated in the optical fiber transmission line (D) OSNR tolerance degradation amount due to residual dispersion at the receiving end of the transponder 120: OSNR tolerance degradation relative to (a) when signal light that cannot fully compensate for dispersion in the optical fiber transmission line is input Amounts (b) to (d) are transmitted without regenerative relay The maximum possible number of sections (for example, if the maximum number of devices is 20, the maximum number of sections in the path opening is 19 sections), and the characteristics at the maximum number of sections depend on the respective effects by optical fiber transmission line simulation. The OSNR deterioration amount is determined in advance. The value of the threshold value X is obtained by adding the OSNR tolerance deterioration amounts (b), (c), and (d) due to passing through the transmission line and the device to the OSNR tolerance of the transponder 120 alone in (a). If the OSNR tolerance of the transponder 120 in (a) is specified at 17 dB, and the OSNR degradation amount due to (b) to (d) is estimated to be 1 dB, the value of the threshold value X is determined to be 20 dB. Is done.

  The threshold value X is the minimum OSNR required to propagate any main signal of wavelength multiplexed light with normal optical characteristics. On the other hand, for the threshold Y, the OSNR of the main signal for which the optical path 200 has already been set is a value greater than or equal to X, whereas the main signal to be newly set is an adjacent channel of the existing main signal. In addition, when the OSNR does not satisfy X, it is a parameter indicating how much the OSNR can be set without affecting the existing main signal. Threshold value Y is the filter transmission characteristic of λn-1 and λn in FIG. 1, and Z is the isolation from the adjacent channel at the center position of the signals of λn-1 and λn.

式（４）で規定される（図２０参照）。例えば、Ｘ＝２０ｄＢ、Ｚ＝１０ｄＢとするならばＹ＝１０ｄＢである。

It is defined by equation (4) (see FIG. 20). For example, if X = 20 dB and Z = 10 dB, Y = 10 dB.

  The calculation of the threshold value Y will be described with reference to FIG. Here, FIG. 20 is a diagram for explaining a method of calculating the threshold value Y in the transmission permission / inhibition determination. In FIG. 20, the vertical axis represents the light level, and the horizontal axis represents the wavelength. The threshold value X is a difference between the signal light level and the optical noise level at the wavelength. The isolation Z is the difference between the separable light level and the optical signal level of the wavelength filter 500 # 2 at the median value ((λn-1 + λn) / 2) between adjacent wavelengths. Therefore, the threshold value Y from Equation (4) is the difference between the separable light level and the optical noise level of the wavelength filter 500 # 2 at the median value between the signal level adjacent wavelengths.

  Hereinafter, based on the network configuration of FIG. 12, the transmission permission / inhibition determination B00 will be specifically described. Here, the optical path 200 # 1 has already been opened, and the optical path 200 # 2 is newly opened (in the path opening dialog G10, the user sets the wavelength G11 to “λ2”, the start point G12 to “B”, The end point G13 is “D”, the direction G14 is “W → E”, the regenerative repeater G15 is “A”, and the open button G16 is pressed).

  The OpS 300 determines whether or not the optical path 200 # 2 can be transmitted as follows. The OpS 300 specifies the path of the optical path 200 # 2 using the information selected by the user and the topology information (FIG. 13). Since the path direction of the optical path 200 # 2 is West → East, the OpS 300 refers to the nodes in the West direction from the start node B to the end node D. As a result, the OpS 300 specifies that the path of the optical path 200 # 2 is B → A → E → D.

  Subsequently, the OpS 300 refers to the topology information table T00 (FIG. 13) in all the nodes (B, A, E, and D) serving as paths, and corresponding IP addresses (10.0.0.2, 10.0). .0.1, 10.0.0.5, 10.0.0.4). The OpS 300 acquires the device information shown in FIG. 16 by performing communication using the obtained IP address.

  Next, the OpS 300 calculates Equation (2) using the position A of the regenerative repeater 130 and the optical amplifier performance information table T20 (FIG. 15), and calculates OSNRALL of the optical path 200 # 2. The OpS 300 acquires OSNRALL “22.7” of the optical path 200 # 2 from the result of the above calculation.

  Assuming that the threshold values used for determination are X = 22 and Y = 20, the condition OSNRALL ≦ Y is not satisfied, and the condition OSNRALL ≦ X is not satisfied. It is determined that no mistake is made.

  Consider the optical path 200 # 3 when the regenerative repeater 130 is not applied to the optical path 200 # 2.

OpS 300 calculates Equation (2) using the position of regenerative repeater 130 (node A) and optical amplifier performance information table T20 (FIG. 15), and calculates OSNRALL of optical path 200 # 3 (see FIG. 21E01). . The OpS 300 obtains OSNRALL “19.8” of the optical path 200 # 3 from the result of the above calculation.
Since the condition OSNRALL ≦ Y is satisfied, the OpS 300 determines that the optical path 200 # 3 misleads signals of other wavelengths.

  Here, with reference to FIG. 21, the calculation results of ONSR, presence / absence of regenerative repeater, accumulated OSNR, and overall OSNR for each optical amplifier in the optical paths 200 # 2 and 200 # 3 will be described. Here, FIG. 21 is a diagram for explaining the calculation results of ONSR, presence / absence of regenerative repeater, cumulative OSNR, and overall OSNR for each optical amplifier. In particular, FIG. 21A relates to the optical path 200 # 2, and FIG. 21B relates to the optical path 200 # 3.

  In FIG. 21A, the optical path 200 # 2 is in the order of nodes B, A, E, and D. Node B is a transmission-only node, node A and node E are receiving and transmitting nodes, and node D is a reception-only node. Node A has a regenerative repeater mounted (◯). The accumulated OSNR is obtained as 23.0 from the equation (2) between the transmission optical amplifier of the node B and the reception optical amplifier of the node A. Further, 22.7 is obtained from the equation (2) with the transmission optical amplifier of the node A, the reception optical amplifier and transmission optical amplifier of the node E, and the reception optical amplifier of the node D. The overall OSNR is 22.7 of the latter.

  On the other hand, in FIG. 21A, the optical path 200 # 3 is in the order of nodes B, A, E, and D. Node B is a transmission-only node, node A and node E are receiving and transmitting nodes, and node D is a reception-only node. Node A does not have a regenerative repeater (×). The cumulative OSNR is calculated from the equation (2) for the transmission optical amplifier at node B, the reception optical amplifier and transmission optical amplifier at node A, the reception optical amplifier and transmission optical amplifier at node E, and the reception optical amplifier at node D. Obtain 19.8. The overall OSNR is also 19.8.

  The influence determination D00 of the already opened path will be described with reference to FIG. Here, FIG. 22 is a flowchart of the influence determination by the already opened path. In FIG. 22, the OpS 300 first includes a transmission optical amplifier type T33 of a start node, a reception optical amplifier type T32 of a relay node, a transmission optical amplifier type T33, and a reception optical amplifier type T32 of an end node in the route of the opened path. Is acquired (D02). Next, the OpS 300 calculates the optical signal-to-noise ratio OSNR for each optical amplifier 155 (D03). Subsequently, the OpS 300 calculates the OSNRDUP in a range where the path overlaps the optical path 200 to be opened as shown in the following formula (5).

パスの始点から経路が重なる部分の終点までの累積ＯＳＮＲを考える。しかし、ＯＳＮＲは、再生中継器１３０の適用により初期化されるため、再生中継器適用ノード毎に区間を区切る。各区間の累積ＯＳＮＲの中で最小のもの（最も誤りが起きる可能性が高い値）を、経路が重なる範囲の累積ＯＳＮＲＤＵＰとする（Ｄ０４）。

Consider the cumulative OSNR from the start point of the path to the end point of the overlapping part. However, since the OSNR is initialized by the application of the regenerative repeater 130, the section is divided for each regenerative repeater application node. The smallest of the accumulated OSNRs in each section (the value that is most likely to cause an error) is defined as the accumulated OSNRDUP in the range where the routes overlap (D04).

  The cumulative OSNRDUP in the range where the routes overlap is determined in the same procedure as B05 to B10 (D05 to D10). As for the threshold value X and the threshold value Y, the fixed values X and Y used in the path transmission availability determination B00 are used.

  Both the path transmission permission / inhibition determination B00 and the already-opened path influence determination D00 determine one of the following results: “Make a signal of another wavelength wrong”, “Make own signal wrong”, “Make no signal wrong”. Although the determination result is omitted in the flowchart, OpS 300 is held in a register or the like.

  The dialog display process C00 will be described with reference to FIGS. Here, FIG. 23 is a diagram for explaining a display message and a display button. FIG. 24 is a flowchart of dialog display.

  In FIG. 23, the display message is a message displayed in the display field G23 of FIGS. 17C and 17D. The buttons are buttons that are displayed / not displayed on the buttons G21 and G22 in FIGS. 17C and 17D. The display message of the record F01 is “The path establishment process cannot be performed because there is a possibility of affecting other wavelength paths”, and the OpS 300 rejects the path establishment. The display message of the record F02 is “There is a possibility that the path cannot be normally opened due to the effect of the opened path. Do you want to continue the path opening process?”, And the OpS 300 is careful about the path opening. The display message of the record F03 is “There is a possibility that the path cannot be normally opened. Do you want to continue the path opening process?”, And the OpS 300 is careful about the path opening. The display message of the record F04 is “An abnormally opened path exists on the route. Do you want to continue the path opening process?”, And the OpS 300 is careful about the path opening. The display message of the record F05 is “Do you want to continue the path establishment process?”, And the OpS 300 confirms further path establishment.

  In FIG. 24, OpS 300 determines whether or not the determination result of transmission permission determination A03 # 1 of the newly opened path is a result of “erroring signals of other wavelengths” (C02). If YES, OpS300 displays F01 in confirmation dialog G20 (C03), and ends dialog display processing C00.

  When NO in C02, the OpS 300 determines whether or not even one of the open path transmission availability determination A03 # 2 is a result of “erroring signals of other wavelengths” (C04). If YES, the OpS 300 displays F02 in the confirmation dialog G20 (C05), and ends the dialog display process C00. When NO in C04, the OpS 300 determines whether or not the result of the transmission permission / inhibition determination A03 # 1 of the newly opened path is a result of “the signal itself is wrong” (C06). If YES, OpS300 displays F03 in confirmation dialog G20 (C07), and ends dialog display process C00.

  When NO in C06, the OpS 300 determines whether or not even one of the open path transmission permission / inhibition determinations A03 # 2 results in “the signal itself is wrong” (C08). If YES, OpS300 displays F04 in confirmation dialog G20 (C09), and ends dialog display processing C00. When NO in C08, OpS300 displays F05 in confirmation dialog G20 (C10), and ends dialog display processing C00.

  Finally, the path deletion process will be described. In response to selection of a path to be deleted from the opened path in the field G08 and pressing of the delete button G03 on the path management screen G00 by the user, the OpS 300 transmits an instruction necessary for path deletion to each OADM node 100. , OpS 300 deletes the selected optical path 200 from the opened path information (FIG. 14).

  The optical path management using the regenerative repeater with the above configuration is realized. In the above-described embodiment, there is no possibility that the optical signal is erroneous when the monitoring control device (OpS) 300 opens the optical path 200, or there is no possibility that the optical path 200 of another wavelength already opened is erroneous. Make a decision and notify the user of the results. When there is a possibility of causing an error in the signal of the optical path of another wavelength, the path opening procedure is not performed.

  According to the embodiment described above, it is possible to easily confirm the reachability of the optical signal and the possibility of adversely affecting the optical paths of other wavelengths when the optical path using the regenerative repeater is opened. If an error occurs in the signal of an already opened optical path, it will lead to a larger accident than if the newly opened optical path does not reach, but this can be prevented and a reliable path opening design can be performed. It becomes possible. In addition, by directly reading from the apparatus without inputting information on the type of optical amplifier used for determining whether or not transmission is possible, it is possible to reduce human errors and perform highly reliable path opening design.

It is a figure explaining the setting error of a regenerative repeater. It is a figure explaining the structure of an optical network, and OSNR change in each node (at the time of a regenerative repeater normal setting). It is a figure explaining the structure of an optical network, and OSNR change in each node (at the time of a regenerative repeater normal setting error). It is a block diagram of an optical network. It is a functional block diagram of an OADM node. It is a functional block diagram of an OADM node to which a regenerative repeater is applied. It is a block diagram of an optical amplification part. It is a block diagram of a regenerative repeater. It is the figure which showed the function of the optical amplifier and the regenerative repeater. It is a functional block diagram of OpS. It is a hardware block diagram of OpS. It is a block diagram explaining the structure of a network. It is a figure explaining a topology information table. It is a figure explaining an already opened path information table. It is a figure explaining an optical amplifier performance information table. It is a figure explaining an apparatus information table. It is an optical path management screen in Ops. It is a path opening dialog screen of Ops. This is an Ops confirmation screen (No. 1). This is the Ops confirmation screen (No. 2). It is a flowchart of a path opening. It is a flowchart of path transmission availability determination by OpS. It is a figure explaining the calculation method of the threshold value Y in transmission propriety determination. It is a figure explaining the calculation result of ONSR for every optical amplifier, the presence or absence of a regenerative repeater, accumulated OSNR, and the total OSNR. It is a flowchart of the influence determination by an already opened path. It is a figure explaining a display message and a display button. It is a flowchart of a dialog display.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 100 ... OADM node, 110 ... OADM part, 120 ... Transponder, 130 ... Regenerative repeater, 150 ... Optical amplification part, 160 ... In-device supervisory control part, 170 ... Optical add / drop unit, 180 ... IF part, 200 ... Optical path , 300 ... OpS, 305 ... Auxiliary storage device (HDD), 310 ... Central processing unit (CPU), 315 ... Input / output unit (I / OIF), 320 ... Main storage device, 325 ... Internal bus, 340 ... Input unit , 350: Output unit, 360: Arithmetic processing unit, 361: Transmission availability determination unit, 362: Opened path influence determination unit, 363 ... Opening availability determination unit, 364 ... Dialog display unit, 365 ... Path opening execution unit, 370 ... Communication processing unit, 380 ... database unit, 450 ... DCN, 550 ... inter-station optical fiber, 600 ... optical network, 650 ... optical network.

Claims (5)

In a supervisory control device that is connected to a plurality of optical add / drop multiplexers and controls the setting of an optical path based on the topology of the plural optical add / drop multiplexers,
An input section;
An output section;
A communication processing unit;
A failure occurs in the newly opened optical path from the type information of the optical amplifier provided in the optical add / drop multiplexer, the performance information of the optical amplifier, the topology, and the position information of the regenerative repeater. A transmission permission / inhibition determination unit that generates the prediction information and the second prediction information in which a failure occurs in the already opened path due to the opening of the optical path to be newly opened,
When the wavelength of the optical path to be newly opened, the start-point optical add / drop multiplexer, the end-point optical add / drop multiplexer, direction, and regenerative repeater application information are input from the user to the input unit, the transmission propriety determination A unit generates the first prediction information and the second prediction information, and the output unit displays the first prediction information and the second prediction information on a screen.
When the user who has confirmed the first predicted information is input to the input unit to continue the path opening process, and the second predicted information is not likely to cause a failure in the already opened path. , Transmitting an instruction required for path opening to the optical add / drop multiplexer through which the optical path to be newly opened passes through the communication processing unit,
The monitoring and control apparatus characterized by not accepting continuation of the path opening process when there is a possibility that a failure occurs in the already opened path in the second predicted information. The monitoring control device according to claim 1,
The monitoring control apparatus further includes an already-opened path influence determination unit that generates third prediction information in which a failure occurs in the optical path to be opened due to the influence of the already-opened optical path. The monitoring and control device according to claim 1 or 2,
The transmission permission / inhibition determining unit and the already-opened path effect determining unit determine an optical signal-to-noise ratio of the entire optical path for the already-opened optical path and the optical path to be opened that overlaps the section, and determine A monitoring control device characterized by the above. An optical path setting control unit for controlling a setting of an optical path based on a topology of the plurality of optical add / drop multiplexers;
A failure occurs in the newly opened optical path from the type information of the optical amplifier provided in the optical add / drop multiplexer, the performance information of the optical amplifier, the topology, and the position information of the regenerative repeater. Functioning as a transmission permission / inhibition determining unit that generates the prediction information and the second prediction information in which a failure occurs in the already opened path due to the opening of the optical path to be newly opened,
When the information on the wavelength of the optical path to be newly opened from the user, the start-point optical add / drop multiplexer, the end-point optical add / drop multiplexer, the direction, and the application of the regenerative repeater is input to the computer, the transmission availability determination unit Generating the first prediction information and the second prediction information, displaying the first prediction information and the second prediction information on a screen of the computer,
When the user who has confirmed the first predicted information is input to the computer to continue the path opening process, and the second predicted information is not likely to cause a failure in the already opened path, Sending a command necessary for path opening to the optical add / drop multiplexer through which the optical path to be newly opened passes,
A program that does not allow continuation of the path opening process if the second predicted information may cause a failure in the already opened path. The program according to claim 4,
A program that causes the computer to further function as an already-opened path influence determination unit that generates third prediction information in which a failure occurs in the optical path to be opened due to the influence of the already-opened optical path.

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