WO2015098028A1 - Dispositif de nœud optique, système de communication optique et procédé de commutation de canaux optiques - Google Patents

Dispositif de nœud optique, système de communication optique et procédé de commutation de canaux optiques Download PDF

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Publication number
WO2015098028A1
WO2015098028A1 PCT/JP2014/006213 JP2014006213W WO2015098028A1 WO 2015098028 A1 WO2015098028 A1 WO 2015098028A1 JP 2014006213 W JP2014006213 W JP 2014006213W WO 2015098028 A1 WO2015098028 A1 WO 2015098028A1
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Prior art keywords
optical
communication path
bandwidth
communication
switching
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PCT/JP2014/006213
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English (en)
Japanese (ja)
Inventor
慎介 藤澤
竹下　仁士
田島　章雄
智之 樋野
池松　龍一
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日本電気株式会社
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Priority to JP2015554534A priority Critical patent/JP6451648B2/ja
Publication of WO2015098028A1 publication Critical patent/WO2015098028A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0005—Switch and router aspects
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0005—Switch and router aspects
    • H04Q2011/0007—Construction
    • H04Q2011/0018—Construction using tunable transmitters or receivers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0005—Switch and router aspects
    • H04Q2011/0037—Operation
    • H04Q2011/0039—Electrical control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0005—Switch and router aspects
    • H04Q2011/0037—Operation
    • H04Q2011/005—Arbitration and scheduling

Definitions

  • the present invention relates to an optical node device, an optical communication system, and an optical communication path switching method, and more particularly to an optical node device, an optical communication system, and an optical communication path switching method used for a backbone optical network.
  • the backbone optical network is configured by connecting node devices through optical fiber communication paths.
  • the backbone optical network provides a function of receiving a client signal via an interface between a node device and a client device and transferring the traffic of the client device with a contract quality of service (service class).
  • the backbone optical network provides a function of communicating via a larger capacity trunk transmission line after multiplexing a plurality of client signals using various multiplexing schemes.
  • the multiplexing scheme includes wavelength division multiplexing (WDM) scheme, time division multiplexing (TDM) scheme, and orthogonal frequency division multiplexing (OFDM scheme such as Orthogonal Division Division Multiplexing scheme).
  • an optical path that can accommodate the same traffic as the active system is set as a backup path, and the path is switched when a failure occurs.
  • the path can be switched in a very short time of 50 ms or less, so that communication interruption can be prevented and a highly reliable network can be constructed.
  • the reliability required for each communication traffic is different, if all the traffic is uniformly assigned a backup path, excessive resources are provided, which is inefficient.
  • a highly reliable network can be made highly efficient. It is possible to provide.
  • shared protection schemes that share backup paths such as 1: N protection schemes and M: N protection schemes, are schemes that share a backup path with multiple operational paths, and realize high efficiency of redundant resources. can do.
  • the protection path is shared by a plurality of operation paths, when a failure occurs, it can be recovered only in a form in which one operation path occupies the protection path. Therefore, there is a problem that communication on other operation paths is interrupted.
  • the priority of traffic accommodated by a plurality of operation paths in which a failure has occurred is clearly defined, and it may be necessary to recover from a failure for only one operation path.
  • the processing amount of the device increases in proportion to the increase in the line bandwidth. There was a problem of increasing.
  • FIG. 25A and 25B are block diagrams showing a schematic configuration of a related optical communication system described in Patent Document 1.
  • FIG. The related optical communication system is configured by connecting a related node device 50 and a node device 60 to a communication network 70.
  • Each node device 50, 60 is provided with both a small granularity switching device 52, 62 and a large granularity switching device 51, 61.
  • the small granularity switching devices 52 and 62 switch the low-order communication path in units of small-capacity switching.
  • the large granularity switching devices 51 and 61 are connected to the higher order communication path and switch the higher order communication path in units of large capacity switching.
  • the large capacity communication paths A and B are connected to the communication network 70 (working communication path) such as an optical fiber through the large granularity switching devices 51 and 61, and the large capacity communication paths A and B are small granularity. It does not pass through the switching devices 52 and 62.
  • the large capacity communication paths A and B are connected to the communication network 70 (detour communication path) via the small granularity switching devices 52 and 62 as shown in FIG. 25B.
  • the traffic on the low-order communication path is filtered to the designated band, and thereafter, the small granularity switching devices 52 and 62 are configured to switch the low-order communication path in units of small-capacity switching.
  • the small granularity switching device is operated when the communication path is in a failure state. At this time, it is necessary to convert the received signal light into an electric signal, and then convert it into signal light again for transmission over an optical fiber (Optical to Electrical, Electrical to Optical: OEO) conversion. Become. For this reason, there is a problem in that power consumption increases correspondingly and latency increases. Further, in the related optical communication system, the node device of the communication path in which the failure has occurred reduces the bandwidth of the signal light in the higher-order communication path serving as the bypass communication path. Therefore, the bandwidth of the signal light in the higher order communication path other than the bypass communication path does not change. As a result, there is a problem that the optical frequency utilization efficiency of the entire optical network is lowered.
  • the backbone optical network has a problem that it is difficult to switch the optical communication path without causing an increase in power consumption and a decrease in the optical frequency utilization efficiency of the entire optical network.
  • the object of the present invention is the above-described problem, and in the backbone optical network, it is difficult to switch the optical communication path without causing an increase in power consumption and a decrease in the optical frequency utilization efficiency of the entire optical network. It is an object of the present invention to provide an optical node device, an optical communication system, and an optical communication path switching method that solve the above problem.
  • An optical node device includes a large granularity switching unit that switches a plurality of communication paths in units of optical carrier frequencies, a plurality of optical transponder devices that transmit and receive client signals via the communication path, a large granularity switching unit, and an optical transponder device
  • the optical transponder device includes a bandwidth variable unit that reduces the signal bandwidth of the client signal, and the control unit detects a trigger for switching a plurality of communication paths.
  • the granularity switching unit and the optical transponder device are notified, the large granularity switching unit switches the communication path when receiving the notification, and the optical transponder device receives the notification of the client signal in the bandwidth variable unit when receiving the notification.
  • the signal light whose bandwidth has been reduced is transmitted to the communication path after the large-grain switching unit has switched.
  • the optical communication system of the present invention includes a first optical node device, a second optical node device, a first communication path that connects the first optical node device and the second optical node device, and a second communication.
  • a first and second optical transponder device that transmits and receives a client signal via the first communication path and the second communication path, a first and second large granularity switching unit, and a first and second light First and second control units that control the operation of the transponder device, respectively, and the first and second optical transponder devices are first and second band variable units that reduce the signal band of the client signal.
  • Each comprising a first control unit and a second control unit
  • the first and second large granularity switching units and the first and second optical transponder devices are notified, and the first and second The second large granularity switching unit switches from the first communication path to the second communication path when the notification is received, and the first and second optical transponder devices perform the first operation when the notification is received.
  • the signal light which reduced the band of the client signal in the second band variable unit is transmitted to the second communication path switched by the first and second large granularity switching units.
  • the plurality of communication paths are switched in units of optical carrier frequency, and the signal light after reducing the bandwidth of the client signal is switched. Send to the communication path.
  • optical communication in the backbone optical network, optical communication can be performed without causing an increase in power consumption and a decrease in optical frequency utilization efficiency as the entire optical network.
  • the road can be switched.
  • FIG. 10 is a flowchart for explaining a method for determining the number of slot slots at time of failure in the optical communication system according to the second embodiment of the present invention. It is a figure which shows the result of having allocated the slot number at the time of a failure in the optical communication system which concerns on the 2nd Embodiment of this invention.
  • FIG. 1 It is a figure which shows the example at the time of making the minimum guarantee zone
  • FIG. 1 is a block diagram showing a configuration of an optical node device 1000 according to the first embodiment of the present invention.
  • the optical node device 1000 includes a large granularity switching unit 1100 that switches a plurality of communication channels 1400 in units of optical carrier frequencies, a plurality of optical transponder devices 1200 that transmit and receive client signals via the communication channel 1400, and a control unit 1300.
  • the optical transponder device 1200 includes a bandwidth variable unit 1220 that reduces the signal bandwidth of the client signal.
  • the control unit 1300 controls the operations of the large grain switching unit 1100 and the optical transponder device 1200. That is, the control unit 1300 notifies the large granularity switching unit 1100 and the optical transponder device 1200 when detecting an opportunity to switch a plurality of communication paths 1400.
  • the large granularity switching unit 1100 switches the communication path 1400 when receiving this notification. Further, when receiving the notification, the optical transponder device 1200 transmits the signal light whose bandwidth of the client signal has been reduced by the bandwidth varying unit 1220 to the communication path 1400 after the large granularity switching unit 1100 has switched.
  • the switching of the communication path 1400 can be performed by the large granularity switching unit 1100, so that the optical / electrical / optical (OEO) conversion is performed. There is no need. Therefore, an increase in power consumption accompanying switching of the communication path 1400 can be suppressed.
  • the optical transponder device 1200 is configured to include a bandwidth variable unit 1220 that reduces the signal bandwidth of the client signal. That is, since the bandwidth of the signal light is reduced at the transmission / reception end of the optical network, the bandwidth of the signal light can be reduced in all the communication paths that pass. As a result, the optical frequency utilization efficiency of the entire optical network can be improved.
  • control unit 1300 can perform the above-described notification when a failure in the communication path 1400 is detected. Then, the control unit 1300 determines the number of slots at the time of failure, which is the number of minimum optical frequency bandwidths that can be used in the communication path 1400 after switching by the large granularity switching unit 1100. At this time, the optical transponder device 1200 can be configured such that the bandwidth varying unit 1220 transmits the signal light in which the bandwidth of the client signal is reduced based on the number of bandwidth slots at the time of failure.
  • the optical communication system according to the present embodiment includes a first optical node device, a second optical node device, a first communication path that connects the first optical node device and the second optical node device, and a second communication.
  • a first optical node device and the second optical node device have the same configuration as the optical node device 1000 described above.
  • the optical communication system may further include a network management unit that manages the number of minimum optical frequency bandwidths that can be used for each of the first communication path and the second communication path.
  • the control unit included in each of the first optical node device and the second optical node device detects the failure in the first communication path, and then controls the large granularity switching unit, the optical transponder device, and the network management unit. The above-mentioned notification is performed for each.
  • the network management unit When the network management unit receives the above notification, the network management unit sets the number of slots at the time of failure, which is the number of minimum optical frequency bandwidths usable in the second communication path, to the first optical node device and the second optical node device. To the optical node device. At this time, the optical transponder device can be configured to transmit the signal light in which the bandwidth variable unit has reduced the bandwidth of the client signal based on the number of bandwidth slots at the time of failure to the second communication path.
  • the optical communication path switching method according to the present embodiment first switches a plurality of communication paths in units of optical carrier frequencies when an opportunity to switch a plurality of communication paths is detected. Then, the signal light from which the band of the client signal is reduced is sent to the communication path after switching.
  • a failure in the communication path when a failure in the communication path is detected, a plurality of communication paths can be switched in units of optical carrier frequencies. Then, the number of slots at the time of failure, which is the number of minimum optical frequency bandwidths that can be used in the communication channel after switching, is determined, and the signal light with the reduced bandwidth of the client signal is transmitted based on the number of slots at the time of failure It can be set as the structure to do.
  • the optical node device As described above, according to the optical node device, the optical communication system, and the optical communication path switching method of the present embodiment, in the backbone optical network, the power consumption increases and the optical frequency utilization efficiency as the entire optical network decreases.
  • the optical communication path can be switched without incurring
  • 2A and 2B show the configuration of an optical communication system according to the second embodiment of the present invention.
  • the optical communication system includes an operation path connected to the network resource management unit 101, variable large granularity node devices 210-1 and 210-2, and variable large granularity node devices 210-1 and 2. 117-1 and 2 and a backup path 118.
  • the network resource management unit 101 is the network management unit
  • the variable large granularity node devices 210-1 and 210-2 are the first optical node device and the second optical node device
  • the operation paths 117-1 and 2 are the first communication path.
  • the backup paths 118 correspond to the second communication paths, respectively.
  • the variable large granularity node device 210-1 includes a variable large granularity switching device 105-1, bandwidth variable optical transponders (TPND) 107-1 and 107-1, and a control function unit 113-1.
  • the variable large granularity node device 210-2 includes a variable large granularity switching device 105-2, bandwidth variable optical transponders (TPND) 107-3 to 107-4, and a control function unit 113-2.
  • the variable large granularity switching devices 105-1 to 105-2 are used as the large granularity switching unit
  • the band variable optical transponders (TPND) 107-1 to 4 are used as the first and second optical transponder devices
  • the control function unit 113-1 is used.
  • ⁇ 2 correspond to the first and second control units, respectively.
  • Notification signals 109-1 and 10-2 are transmitted and received between the network resource management unit 101 and the control function units 113-1 and 113-2.
  • the notification signals 109-1 and 109-2 include network resource management information, a failure notification when a failure occurs in the working paths 117-1 and 118 and the backup path 118, and communication establishment between the variable large-grain node devices 210-1 and 210-2. Notifications, etc. are included.
  • the control function unit 113-1 sends a notification signal 109-1 to the band variable optical TPNDs 107-1 and 2-2 and the variable large granularity switching device 105-1.
  • the control function unit 113-2 sends a notification signal 109-2 to the band variable optical TPNDs 107-3 to -4 and the variable large granularity switching device 105-2.
  • the band variable optical TPND 107 includes a band variable unit 106, an optical transmission / reception device 119, and a client interface 120 as shown in FIG. 2C.
  • the optical transmitter / receiver 119 and the band variable unit 106 receive the control signal from the control function unit 113.
  • the bandwidth variable unit 106 transmits a traffic suppression signal transmission command 123 to the client interface 120.
  • variable large granularity switching device 105 switches the communication path in units of optical carrier frequency. That is, the variable large granularity switching device 105 is a device that performs path switching with a granularity equal to or greater than the minimum optical frequency bandwidth of the backbone transmission communication path. For example, when the backbone transmission channel is a wavelength path, the granularity of the minimum optical frequency bandwidth is the granularity of the optical carrier frequency grid. In this case, the variable bandwidth optical cross-connect device corresponds to the large granularity switching device. Specifically, for example, as shown in FIG. 3, the variable large granularity switching device 105 switches the communications 126-1 to 126-3 on the communications paths 117-1 to 11-4 having different numbers of optical band slots to different paths.
  • the optical communication system according to the present embodiment even when a failure occurs in a plurality of operation paths, it is possible to perform failure recovery that realizes switching to a backup path while preventing communication interruption.
  • the network resource management unit 101 determines a predetermined minimum optical frequency bandwidth (hereinafter referred to as “bandwidth”) that can be used for communication between two sites according to the communication traffic between sites and the network resources that can be used on the optical communication system. The number of allocations in units is determined. Then, the network resource management unit 101 notifies the determined allocation numbers to the control function units 113-1 and 113-2, respectively. For example, as shown in FIG. 4, the network resource management unit 101 manages the number of contracted bandwidth slots (the number of minimum guaranteed bandwidth slots) during normal operation and when a failure occurs for each communication between bases.
  • bandwidth a predetermined minimum optical frequency bandwidth
  • the band variable unit 106 included in the band variable optical TPNDs 107-1 to -4 multiplexes / separates client signals according to the notified number of band slots. Then, communication between the two bases is established using the band variable optical TPNDs 107-1 to 10-4.
  • the bandwidth variable unit 106 functions as a simple multiplex circuit or separation circuit. For example, when the maximum bandwidth of the optical transponder is 100 Gb / s, ten 10 Gb / s signals or four 25 Gb / s signals can be accommodated as client signals.
  • the present invention is not limited to this, and it is possible to aggregate (aggregate) a plurality of opposed band-fixed optical transponders to establish communication using one operational path. That is, communication with four band slots may be performed using two sets of band-fixed optical transponders for communication with two band slots.
  • notification signals 109-1 and 109-2 are sent from the control function units 113-1 and 113-2 to the network resource management unit 101.
  • the network resource management unit 101 sets the traffic volume, priority, and minimum so that the sum of the number of bandwidth slots at the time of failure of the plurality of working paths accommodated on the protection path is equal to or less than the number of bandwidth slots allocated for the protection path.
  • the number of bandwidth slots at the time of failure is determined according to the number of guaranteed bandwidth slots. Then, the control function units 113-1 and 113-2 are notified of the determined failure time band slot number.
  • the bandwidth variable unit 106 included in the bandwidth-tunable optical TPNDs 107-1 to -4 can narrow down the client signal bandwidth according to the number of bandwidth slots at the time of failure, so that traffic can be accommodated in the bandwidth according to the number of bandwidth slots at time of failure. It becomes. Specifically, the bandwidth variable unit 106 included in the bandwidth-variable optical TPND on the transmission side transmits the traffic suppression signal transmission command 123 to the client interface 120, thereby suppressing the traffic of the client signal.
  • FIG. 5 is a sequence diagram for explaining the path switching operation when a failure occurs.
  • the variable large granularity node devices 210-1 and 210-2 perform path switching in units of bandwidth slots at the time of failure when a failure occurs.
  • variable large granularity node devices 210-1 and 210-2 detect that a failure has occurred in the operation paths 117-1 and 2, the variable large granularity node devices 210-1 and 210-2 send a notification signal 109 to the network resource management unit 101 (step S115-1).
  • the network resource management unit 101 Upon receipt of the failure occurrence notification signal 109, the network resource management unit 101 refers to the network resource management table (for example, FIG. 4) and determines the number of failed bandwidth slots by a method described later (step S115-2).
  • the switching band and the detour communication path to be connected in variable large granularity switching devices 105-1 and 105-2 are determined (steps S115-3 to S4). Then, the network resource management unit 101 notifies the control function units 113-1 and 113-2 of the failure setting information.
  • the control function units 113-1 to 113-2 of the variable large granularity node devices 210-1 to 210-2 that have received the failure setting information notify the respective units of the variable large granularity node devices 210-1 to 210-2 (steps). S115-5). Based on the failure setting information, the bandwidth variable unit 106 included in the bandwidth variable optical TPNDs 107-1 to TPND4-4 is set (step S115-6). Then, the switching band of the variable large granularity switching devices 105-1 and 105-2 is set with the granularity of the band slot (step S115-7), and the communication path connected to the variable large granularity switching devices 105-1 and 10-2 is changed to the bypass communication path. Switching (step S115-8).
  • FIG. 6 is a flowchart for explaining a method of determining the number of slot slots at the time of failure.
  • the network resource management unit 101 refers to the minimum guaranteed bandwidth slot number in the network resource management table shown in FIG. 4 (step S111-1). Then, the same number of bandwidth slots as the minimum number of guaranteed slots are allocated to communications with the minimum number of guaranteed bandwidth slots being 1 or more (step S111-2). Next, one bandwidth slot is allocated to communication with the minimum guaranteed bandwidth slot number being zero (step S111-3A). If the number of remaining bandwidth slots is not zero, the number of bandwidth slots is further determined based on the number of normal time bandwidth slots (step S111-4A).
  • the optical frequency band can be allocated by the First-Fit method (steps S111-3B to 4B).
  • the allocation is not limited to this, and the number of remaining bandwidth slots can be allocated based on the Most-Used scheme, the equal allocation scheme, and the scheme in which the backup path length is allocated in the descending order.
  • the setting of the number of slots at the time of failure is completed by the above-described routine for setting the number of slots at the time of failure (step S111-7) (step S111-5).
  • the network resource management unit 101 notifies the variable large granularity node devices 210-1 and 210-2 of the allocation of the bandwidth slot number at the time of failure (step S111-6).
  • FIG. 7 shows a result of assigning the number of bandwidth slots at the time of failure by the failure recovery method in the present embodiment. Since the number of bandwidth slots of the backup path 118 is 4, three of the minimum guaranteed slots are assigned to the communication on the working path 117-1 first. Next, only one remaining bandwidth slot of the backup path 118 is allocated for communication on the working path 117-2.
  • the allocated optical frequency band may be designated by an absolute value of the optical frequency bandwidth (for example, 35 GHz). Thereby, the optical frequency bandwidth for accommodating the operation path can be continuously varied.
  • the network resource management unit 101 notifies the control function units 113-1 and 113-2 of the minimum guaranteed bandwidth slot number according to the number of failures. Then, communication using the signal light narrowed down to the communication band corresponding to the minimum guaranteed band slot number is performed by the band variable optical TPNDs 107-1 to TPND107-1.
  • the bandwidth variable unit narrows down the bandwidth of the client signal according to the number of bandwidth slots at the time of failure.
  • traffic can be accommodated in a band corresponding to the number of slot slots at the time of failure.
  • the variable large granularity switching device performs path switching according to the number of bandwidth slots, communication interruption can be prevented without increasing power consumption or device scale even for large-capacity communication.
  • FIG. 9A and 9B show the configuration of an optical communication system according to the third embodiment of the present invention.
  • FIG. 9A is a block diagram showing a configuration in a normal state of the optical communication system according to the present embodiment
  • FIG. 9B is a block diagram showing a configuration when a failure occurs.
  • the optical communication system according to the present embodiment includes variable large-grain node devices 214-1 and 214-2, and control function units 113-1 and 113-2 included in the variable large-grain node devices 214-1 and 214-2 directly transmit and receive the notification signal 109.
  • the notification signal 109 includes node resource management information of the variable large granularity node devices 214-1 and 214-2, a failure notification when a failure occurs in the operation paths 117-1 and 112-2 and the backup path 118, and the variable large granularity node device 214-1 Including notification of establishment of communication between .about.2.
  • the optical communication system according to the present embodiment even when a failure occurs in a plurality of operation paths, it is possible to perform failure recovery that realizes switching to a backup path while preventing communication interruption.
  • the control function units 113-1 and 113-2 perform predetermined minimum light that can be used for communication between the two bases according to the amount of communication traffic between the variable large-grain node devices 214-1 and 214-2 and the available network resources.
  • the number of allocations in units of frequency bandwidth is notified to each other. This minimum optical frequency bandwidth is hereinafter referred to as a “band slot”.
  • the control function units 113-1 and 113-2 manage the number of contract bandwidth slots during normal operation and when a failure occurs between the variable large-grain node devices 214-1 and 21-2.
  • the band variable unit 106 included in the band variable optical TPNDs 107-1 to 10-4 multiplexes / demultiplexes the client signal according to the notified number of band slots. Then, communication between the two bases is established using the band variable optical TPNDs 107-1 to 10-4.
  • the control function units 113-1 and 113-2 send out notification signals 109.
  • the control function units 113-1 and 113-2 perform the traffic amount and priority so that the sum of the number of bandwidth slots at the time of failure of the plurality of working paths accommodated on the protection path is equal to or less than the number of bandwidth slots allocated for the protection path.
  • the number of bandwidth slots at the time of failure is determined according to the minimum number of guaranteed bandwidth slots.
  • the control function units 113-1 and 113-2 configure a partial table for communication that passes through the variable large granularity node devices 214-1 and 214-2 in the network resource management table managed by the network resource management unit 101 in the second embodiment. To do. Then, each control function unit 113-1 to 113-2 determines the number of bandwidth slots at the time of failure with reference to this partial table.
  • the bandwidth variable unit 106 included in the bandwidth-tunable optical TPNDs 107-1 to -4 can narrow down the client signal bandwidth according to the number of bandwidth slots at the time of failure, so that traffic can be accommodated in the bandwidth according to the number of bandwidth slots at time of failure. It becomes. Specifically, the bandwidth variable unit 106 included in the bandwidth-variable optical TPND on the transmission side transmits the traffic suppression signal transmission command 123 to the client interface 120, thereby suppressing the traffic of the client signal.
  • FIG. 10 is a sequence diagram for explaining the path switching operation when a failure occurs.
  • the variable large granularity node device 214-1 detects the occurrence of a failure, it sends a failure notification 109 to the variable large granularity node device 214-2 on the communication partner side (step S116-1).
  • the variable large granularity node devices 214-1 and 214-2 refer to the resource management tables held by them and notify each other of the bandwidth usage status and the minimum guaranteed bandwidth slot number (step S 116). -2A-2B).
  • variable large granularity node devices 214-1 and 214-2 determine the allocation of the fault time band slot based on the notified result (steps S 116-3 A to 3 B).
  • the switching band (steps S116-4A to 4B) in the variable large granularity switching device 105-1 to 105-2 and the detour to which the variable large granularity switching device 105-1 to 2 is connected are determined (step S116-5A to step S116-5A). 5B).
  • step S115-5 shown in FIG. Steps S115-9A-9B
  • step S116-6 S115-2A to 5A, 2B to 5B
  • the bandwidth variable unit narrows down the bandwidth of the client signal according to the number of bandwidth slots at the time of failure.
  • traffic can be accommodated in a band corresponding to the number of slot slots at the time of failure.
  • the variable large granularity switching device performs path switching according to the number of bandwidth slots, communication interruption can be prevented without increasing power consumption or device scale even for large-capacity communication.
  • FIG. 11A is a block diagram showing a configuration in a normal state of the optical communication system according to the present embodiment
  • FIG. 11B is a block diagram showing a configuration when a failure occurs.
  • variable large granularity node devices 212-1 and 212-1 are connected to the working paths 117-1 and 11-2 and the backup path 118.
  • the variable large granularity node device 212-1 includes a variable large granularity switching device 105-1 and band variable optical TPNDs 128-1 to -3.
  • the variable large granularity node device 212-2 includes a variable large granularity switching device 105-2 and band variable optical TPNDs 128-4 to 6.
  • FIG. 11C shows the configuration of the band variable optical TPND 128 included in the variable large-grain node devices 212-1 and 212-2.
  • the band variable optical TPND 128 according to the present embodiment is different from the band variable optical TPND 107 according to the second embodiment in that a band slot allocation setting unit 127 is further provided.
  • the band slot allocation setting unit 127 has a function of notifying the optical transceiver 119 of the band slot allocation of signal light.
  • the optical communication system according to the present embodiment even when a failure occurs in a plurality of operation paths, it is possible to perform failure recovery that realizes switching to a backup path while preventing communication interruption.
  • the network resource management unit 101 includes a network resource management table as shown in FIG. 12, for example, and manages the contracted bandwidth slot number (minimum guaranteed bandwidth slot number) for each communication between bases during normal operation and when a failure occurs.
  • the control function units 113-1 and 113-2 are notified of the number of bandwidth slots required for communication between the two sites.
  • the band slot allocation setting unit 127 sets the band slot allocation of the signal light of the optical transceiver 119 according to the notified number of band slots. Then, communication between the two bases is established using the band variable optical TPNDs 128-1 to -6. Note that, as shown in FIG. 11A, communication of one working path may be established using a plurality of band variable optical TPNDs 128-2 to -3.
  • the normal time band slots on the working paths 117-1 and 11-2 are compressed, for example, in the short wavelength direction for each working path.
  • the network resource management unit 101 determines the allocation of the fault time band slot (see FIG. 12), and notifies the control function units 113-1 and 11-2 of the determined allocation of the fault time band slot.
  • the band slot allocation setting unit 127 performs band allocation of signal light in the optical transmission / reception apparatus 119 according to the notification result of band slot allocation.
  • the failure time slot is compressed in the short wavelength direction in communication on the operation path, but the present invention is not limited to this.
  • FIG. 13 is a flowchart for explaining a method of assigning a fault time slot.
  • the network resource management unit 101 refers to the minimum guaranteed bandwidth slot number in the network resource management table shown in FIG. 12, and has the same number of bandwidth slots as the minimum guaranteed bandwidth slot number for communications having the minimum guaranteed bandwidth slot number of 1 or more. A number is assigned (step S114-1).
  • band slots are continuously allocated to the backup path band according to the allocated number of band slots (step S114-2A). At this time, if allocation of consecutive bandwidth slots fails due to occurrence of fragmentation (assignment is completed: NO), the same number of bandwidth slots as the minimum guaranteed bandwidth slots are discontinuously allocated to the fractional free bandwidth slots. Is assigned (step S114-2B).
  • the network resource management unit 101 notifies the variable large granularity node devices 212-1 and 212-2 of band slot allocation.
  • the band slot allocation setting unit 127 included in the band variable optical TPND 128 allocates at least a part of the signal light to the backup path band discontinuously.
  • the backup path band is composed of a plurality of band slots (minimum optical frequency bandwidth) that can be used in the communication channel (backup path) after the switching by the variable large granularity switching devices 105-1 and 105-2.
  • variable large granularity switching device that does not have a path restriction
  • discontinuous free optical frequency bands can be assigned to different paths. It is also possible to establish communication between two bases via the basic transmission communication path.
  • the optical communication path switching method first, when an opportunity to switch a plurality of communication paths, for example, when a failure in the communication path is detected, the plurality of communication paths are switched in units of optical carrier frequencies. Then, at least a part of the signal light is discontinuously allocated to a plurality of minimum optical frequency bands that can be used in the communication path after switching at this time.
  • FIG. 14 shows a result of assigning the number of bandwidth slots at the time of failure by the failure recovery method in the present embodiment.
  • allocation is performed with reference to the minimum guaranteed bandwidth slot number.
  • the number of bandwidth slots in the backup path 118 is five.
  • the number of bandwidth slots at the time of failure is three, and for the communication 124-2 between the variable bandwidth optical TPNDs 128-2 and 128-5 Allocate only one slot slot during failure.
  • only one remaining bandwidth slot of the backup path 118 is allocated to the communication 124-3 between the bandwidth variable optical TPNDs 128-3 and 128-6.
  • the communication 124-2 is assigned to the fourth band slot on the protection path 118. For this reason, the communication 124-1 cannot be continuously allocated to the second, third, and fourth band slots after being compressed in the short wavelength direction. Therefore, if communication 124-1 is performed using only the second and third band slots, the fifth band slot is unused (third column (continuous allocation) in FIG. 14). Frequency utilization efficiency will decrease.
  • the bandwidth slots are allocated discontinuously. Therefore, the communication 124-1 can be performed by the communication 124-1A allocated to the second and third band slots and the communication 124-1B allocated to the fifth band slot. In other words, according to the present embodiment, it is possible to improve the use efficiency of the optical frequency by allocating the band slots discontinuously, rather than continuously accommodating the traffic of the working path on the backup path. Is obtained.
  • the optical communication system according to the present embodiment is effective even in the case of a contract in which the minimum guaranteed bandwidth slot number for the communication on the operation path varies according to the number of failures.
  • the network resource management unit 101 notifies the control function units 113-1 and 113-2 of the minimum guaranteed bandwidth slot number according to the number of failures. Communication using signal light narrowed down to the communication band corresponding to the minimum guaranteed bandwidth slot is performed by the band variable optical TPNDs 128-1 to TPND128-1.
  • the optical communication system according to the present embodiment is particularly effective when the backup path is shared with other operational paths when multiple failures occur.
  • the optical communication system of the present embodiment when a failure occurs in the operation path, it is possible to accommodate traffic even in a discontinuous unused (free) optical frequency band. Become. At this time, since the variable large granularity switching device performs path switching, communication interruption can be prevented without increasing power consumption or device scale even for large-capacity communication.
  • FIG. 15A and 15B show the configuration of an optical communication system according to the fifth embodiment of the present invention.
  • FIG. 15A is a block diagram showing a configuration in a normal state of the optical communication system according to the present embodiment
  • FIG. 15B is a block diagram showing a configuration when a failure occurs.
  • the optical communication system according to the present embodiment is different from the optical communication system according to the second embodiment in that an optical frequency band fragmentation monitoring unit 108 is provided.
  • the optical frequency band fragmentation monitoring unit 108 is connected to the network resource management unit 101.
  • the optical communication system according to the present embodiment even when a failure occurs in a plurality of operation paths, it is possible to perform failure recovery that realizes switching to a backup path while preventing communication interruption.
  • the optical frequency band fragmentation monitoring unit 108 acquires the network resource state of the backbone optical network managed by the network resource management unit 101. Then, the optical frequency band fragmentation monitoring unit 108 calculates a ratio (fragmentation rate) of the fragmented region of the optical frequency band to the assignable optical frequency band.
  • the fragmentation rate calculated by the optical frequency band fragmentation monitoring unit 108 will be described with reference to FIGS. 16A and 16B.
  • FIG. 16A is a diagram for explaining a method of calculating a fragmentation rate by the optical frequency band fragmentation monitoring unit 108.
  • the fragmented area of the optical frequency band indicates the number of used slots minus the number of used slots (used slot range). Of unused slots).
  • the fragmentation rate is calculated as 23.3% (100 ⁇ (60 ⁇ 46) / 60) in the example shown in FIG. 16A.
  • FIG. 16B shows an example of the temporal change of the fragmentation rate in the optical network.
  • the optical frequency band fragmentation monitoring unit 108 is a network resource management unit. 101 is requested to perform optical band defragmentation.
  • the network resource management unit 101 rearranges the optical paths in the fragmented region of the optical frequency band for the operation path or backup path whose wavelength assignment can be changed, and aggregates them in a continuous region.
  • the control function units 113-1 and 11-2 are notified of the reset result at this time.
  • the control function units 113-1 and 113-2 change the setting of the optical path route based on the resetting result, whereby the optical frequency band defragmentation is completed.
  • the optical frequency band fragmentation monitoring unit 108 calculates the fragmentation rate using the number of unused slots within the used slot range. Not limited to this, the optical frequency band fragmentation monitoring unit 108 can also apply the frequency distribution of the bandwidth of the continuous optical frequency band as a scale for measuring the fragmented area of the optical frequency region.
  • the optical frequency band fragmentation monitoring unit 108 may set a plurality of thresholds for the ratio of fragmented regions.
  • the condition for performing the optical band fragmentation is any of when both the first threshold value and the second threshold value are exceeded, and when the time exceeding the first threshold value exceeds a preset time. It is possible to satisfy either of them.
  • the optical frequency band fragmentation monitoring unit 108 may periodically acquire the network resource status managed by the network resource management unit 101, or may operate when a failure occurs.
  • FIG. 17 shows an example of a management table provided in the network resource management unit of the optical communication system according to the present embodiment.
  • communication quality may deteriorate due to optical band defragmentation.
  • optical band defragmentation is not permitted for communication between the band variable optical TPNDs 128-2 and 128-4. Therefore, even if fragmentation occurs in the optical frequency band, the optical path assigned to the fourth slot is not rearranged.
  • FIG. 18 shows a result of assigning a failure time slot by the failure recovery method according to this embodiment.
  • the number of bandwidth slots in the backup path 118 is five.
  • the minimum guaranteed bandwidth slot number is four for the communication 124-1 between the variable bandwidth optical TPNDs 128-1 and 128-3, and the communication between the variable bandwidth optical TPNDs 128-2 and 128-4.
  • the minimum guaranteed bandwidth slot number is one.
  • the communication 124-2 has already been assigned to the 4th slot, and optical band defragmentation is not permitted.
  • the band slot allocation setting unit 127 included in the band variable optical TPND 128 allocates at least a part of the signal light to the backup path band in a non-consecutive manner. Therefore, when a failure occurs, as shown in FIG. 18, optical frequency bands may be allocated discontinuously to the first to third band slots (communication 124-1A) and the fifth band slot (communication 124-1B). it can. As a result, communication 124-1 can be performed even when a failure occurs.
  • this embodiment can be applied not only when optical band defragmentation is not permitted, but also when fragmentation cannot be completely removed when optical band defragmentation is executed.
  • the optical communication system further includes the optical frequency band fragmentation monitoring unit 108.
  • the optical frequency band fragmentation monitoring unit 108 has a fragmented unused frequency region in an optical frequency band that can be used in at least one of the first communication path that is the active path and the second communication path that is the backup path. Monitor whether it has occurred.
  • the optical frequency band fragmentation monitoring unit 108 instructs the network management unit to perform aggregation.
  • the network management unit sets a continuous unused frequency region by consolidating fragmented unused frequency regions.
  • the first and second optical transponder devices which are the variable bandwidth optical TPND 128, transmit signal light using a continuous unused frequency region.
  • the optical communication system of the present embodiment when a failure occurs on the operation path in the optical communication system that performs optical band defragmentation, a non-continuous unused band slot is detected. Even traffic can be accommodated. At this time, since the variable large granularity switching device performs path switching, communication interruption can be prevented without increasing power consumption or device scale even for large-capacity communication.
  • FIG. 19A and 19B show the configuration of an optical communication system according to the sixth embodiment of the present invention.
  • FIG. 19A is a block diagram illustrating a configuration in a normal state of the optical communication system according to the present embodiment
  • FIG. 19B is a block diagram illustrating a configuration when a failure occurs.
  • variable large-grain node devices 211-1 and 211-2 are connected to the working paths 117-1 and 11-2 and the backup path 118.
  • the variable large-grain node device 211-1 includes band-variable optical TPNDs 126-1 and 1-2.
  • variable large granularity node device 211-2 includes band variable optical TPNDs 126-3 to -4.
  • FIG. 19C shows the configuration of the bandwidth variable optical TPND 126 provided in the variable large-grain node devices 211-1 and 211-2.
  • the band variable optical TPND 126 of the present embodiment is different from the band variable optical TPND 107 according to the second embodiment in that the optical spectrum shaping setting unit 125 is further provided.
  • the optical spectrum shaping setting unit 125 has a function of notifying the optical transmitter / receiver 119 of the setting of the optical spectrum shaping of the signal light.
  • the optical communication system according to the present embodiment even when a failure occurs in a plurality of operation paths, it is possible to perform failure recovery that realizes switching to a backup path while preventing communication interruption.
  • the network resource management unit 101 includes a network resource management table as shown in FIG. 20, for example, and notifies the control function units 113-1 and 113-2 of the normal communication capacity in communication between the two sites.
  • the optical spectrum shaping setting unit 125 sets, for example, a roll-off rate as a setting parameter for the number of band slots of signal light and the optical frequency utilization efficiency of the optical transceiver 119 according to the notified communication capacity. Then, communication between the two bases is established using the band variable optical TPNDs 126-1 to TPND12-4. At this time, the optical spectrum shaping setting unit 125 can vary the communication capacity per unit frequency, that is, the frequency utilization efficiency.
  • the network resource management unit 101 notifies the control function units 113-1 and 11-2 of the minimum guaranteed communication capacity managed.
  • the optical spectrum shaping setting unit 125 calculates an optical spectrum shaping setting parameter (in the example of FIG. 20, a roll-off rate at the time of failure) so as to satisfy the minimum guaranteed communication capacity according to the notification result of the minimum guaranteed communication capacity. Notify the transmission / reception device 119.
  • a roll-off rate (r) of the Nyquist pulse will be described as an example of setting parameters for optical spectrum shaping.
  • FIG. 21 shows a change in the increase rate ( ⁇ C) of the frequency utilization efficiency when the roll-off rate r is changed.
  • the frequency utilization efficiency when the roll-off rate is 1 is 1.
  • the modulation scheme is a polarization-multiplexed QPSK (Polarization-Multiplexed Phase Shift Keying: PM-QPSK) scheme
  • the frequency utilization efficiency when the roll-off rate is 1 is 2 bits / s / Hz.
  • the roll-off rate can be changed only when a route is assigned to the backup path 118.
  • FIG. 22 is a flowchart for explaining the procedure for setting the number of slot slots at the time of failure and the roll-off rate.
  • the optical spectrum shaping setting unit 125 refers to the minimum guaranteed communication capacity of the management table shown in FIG. 20 (step S112-1), and calculates the number of slot slots at the time of failure and the roll-off rate that satisfy this minimum guaranteed communication capacity. Then, bandwidth allocation corresponding to this is performed (step S112-2).
  • step S112-3A if there is a surplus optical frequency band, one band slot is allocated to each of the operation paths having a minimum guaranteed communication capacity of zero (step S112-3A). At this time, when the number of remaining bandwidth slots after allocation of the minimum guaranteed communication capacity is insufficient (allocation is completed: NO), bandwidth slots are allocated by the First-fit method (step S112-3B).
  • bandwidth allocation is performed according to the number of bandwidth slots that satisfy the normal communication capacity (step S112-4A). At this time, if the number of remaining bandwidth slots is insufficient (allocation is completed: NO), the allocated optical frequency band is reduced by changing the roll-off rate setting (step S112-4B). Also in this case, when the number of remaining bandwidth slots is insufficient (allocation is completed: NO), bandwidth slots can be allocated by the First-fit method (step S112-4C).
  • step S112-5) the setting of the number of slot slots at the time of failure and the roll-off rate is completed.
  • the optical spectrum shaping setting unit 125 notifies the optical transmission / reception apparatus 119 of the failure time slot number obtained here and the roll-off rate, which is the setting parameter of the optical frequency utilization efficiency (step S112-6).
  • FIG. 23 shows the result of setting the failure time slot number and the failure roll-off rate by the failure recovery method in the present embodiment.
  • the number of bandwidth slots in the backup path 118 is four.
  • the communication capacity at the time of failure is 80 Gb / s, and the communication 124-1 that has undergone optical spectrum shaping is accommodated.
  • the communication 124-2 on the working path 117-2 one failure time slot number is assigned and 1 is assigned as the failure roll-off rate.
  • the communication 124-1 and the communication 124-2 can be accommodated in the backup path 118.
  • the optical frequency utilization efficiency is changed by performing optical spectrum shaping using the optical spectrum shaping setting unit 125.
  • the present invention is not limited to this, and it is possible to change the optical frequency utilization efficiency by changing the modulation method, or changing the number of subcarriers of orthogonal frequency division multiplexing (OFDM) signal light. Also good.
  • the optical transponder device included in the optical node device that is the variable large-grain node device 211 according to the present embodiment includes the optical frequency utilization efficiency setting unit including the optical spectrum shaping setting unit 125, A transmission / reception device 119 is provided.
  • the optical frequency utilization efficiency setting unit calculates an optical frequency utilization efficiency setting parameter. Then, the optical transmission / reception apparatus transmits the signal light with the optical frequency utilization efficiency corresponding to the setting parameter.
  • the roll-off rate is set so as to satisfy the minimum guaranteed communication capacity according to the number of bandwidth slots at the time of failure.
  • the band variable unit 106 narrows down the band of the client signal. As a result, traffic can be accommodated in a band corresponding to the number of slot slots at the time of failure.
  • the variable large granularity switching device performs path switching according to the number of bandwidth slots, communication interruption can be prevented without increasing power consumption or device scale even for large capacity communication.
  • variable large-grain node device 210 is arranged at two bases for inter-base communication.
  • the present invention is not limited to this, and as shown in FIGS. 24A and 24B, a configuration of an optical communication system in which variable large-grain node devices 210 are arranged in a mesh and each variable large-grain node device is connected by a backbone transmission channel. It is good.
  • FIG. 24A shows the configuration of the optical communication system in the normal state
  • FIG. 24B shows the configuration when a failure occurs.
  • the arrangement shape of the variable large-grain node device 210 is not limited to a mesh shape, but can be applied to a node arrangement such as a ring shape or a tree shape.
  • variable bandwidth unit 106 included in the variable bandwidth optical TPNDs 107-1 to 10-4 narrows down the bandwidth of the client signal based on the network resource information from the network resource management unit 101. As a result, traffic can be accommodated in a band corresponding to the number of slot slots at the time of failure.
  • the variable large granularity switching devices 105-3 to 105-8 can establish communication on the protection path 118 by switching the connection to the bypass basic transmission communication path.
  • the bandwidth varying unit responds to the number of bandwidth slots during failure. To narrow the bandwidth of the client signal. As a result, it becomes possible to accommodate traffic in a band corresponding to the number of slot slots at the time of failure. At this time, since the variable large granularity switching device performs path switching according to the number of bandwidth slots, communication interruption can be prevented without increasing power consumption or device scale even for large capacity communication.
  • a plurality of communication paths are switched when a failure on the operation path is detected.
  • the present invention is not limited to this.
  • the communication path may be switched when a new bandwidth slot setting request (interrupt request) is generated.
  • a new bandwidth slot setting request interrupt request
  • a large granularity switching unit that switches a plurality of communication paths in units of optical carrier frequency, a plurality of optical transponder devices that transmit and receive client signals via the communication path, the large granularity switching unit, and the optical transponder device
  • a control unit that controls operation, and the optical transponder device includes a band variable unit that reduces a signal band of the client signal, and the control unit detects an opportunity to switch the plurality of communication paths.
  • the large-grain switching unit and the optical transponder device, and the large-grain switching unit switches the communication path when receiving the notification, and the optical transponder device has received the notification.
  • the bandwidth variable unit transmits the signal light whose bandwidth of the client signal is reduced to the communication path after the large granularity switching unit switches Optical node device.
  • the optical transponder device includes a band slot allocation setting unit, and the band slot allocation setting unit includes a plurality of minimum optical frequency bandwidths that can be used in the communication path after the large granularity switching unit is switched.
  • the optical transponder device includes an optical frequency utilization efficiency setting unit and an optical transmission / reception device, the optical frequency utilization efficiency setting unit calculates an optical frequency utilization efficiency setting parameter, and the optical transmission / reception device includes: The optical node device according to any one of appendices 1 to 3, wherein the signal light is transmitted with an optical frequency utilization efficiency corresponding to the setting parameter.
  • a switching unit, first and second optical transponder devices that transmit and receive client signals via the first communication path and the second communication path, the first and second large granularity switching units, and the First and second control units for controlling the operation of the first and second optical transponder devices, respectively, and the first and second optical transponder devices each have a signal band of the client signal.
  • Each of the first control unit and the second control unit detects a trigger for switching from the first communication path to the second communication path, and the first and second large granularities.
  • the switching unit and the first and second optical transponder devices are notified, and the first and second large granularity switching units receive the notification from the first communication path when the notification is received.
  • the first and second optical transponder devices are switched to a second communication path, and the first and second optical transponder devices reduce the bandwidth of the client signal in the first and second bandwidth variable units when receiving the notification.
  • the first optical node device and the second optical node device, and the first and second optical transponder devices are configured such that the first and second bandwidth variable sections are set to the number of slot bands at the time of failure.
  • Optical communication system according to Note 5 the signal light with a reduced bandwidth of the client signal Zui, sent to the second communication path.
  • optical frequency band fragmentation monitoring unit It further has an optical frequency band fragmentation monitoring unit, and the optical frequency band fragmentation monitoring unit has an optical frequency band that can be used in at least one of the first communication path and the second communication path. Monitoring whether or not a fragmented unused frequency region has occurred, and if the unused frequency region has occurred, instructs the network management unit to perform aggregation, and the network management unit Supplementary note 6 in which the unused frequency regions are aggregated to set a continuous unused frequency region, and the first and second optical transponder devices transmit the signal light using the continuous unused frequency region.
  • Appendix 10 The optical communication path switching method according to appendix 8 or 9, wherein at least part of the signal light is discontinuously allocated to a plurality of minimum optical frequency bandwidths that can be used in the communication path after the switching.
  • the communication path after switching by the large granularity switching unit has a plurality of bypass communication paths, and the optical transponder device uses the optical frequency bands of the plurality of bypass communication paths, 5.
  • the optical node device according to any one of appendices 1 to 4, which transmits signal light.
  • the network management unit manages a plurality of bandwidth reduction amounts according to a failure state of a communication path, and the first and second bandwidth variable units correspond to the plurality of bandwidth reduction amounts,
  • the network management unit manages a priority of a preset communication channel, and the first and second band variable units reduce a signal band according to the priority of the communication channel.
  • the optical communication system according to any one of Supplementary Notes 6, 7, and 15, wherein
  • Optical node device 1100 Large granularity switching unit 1200
  • Optical transponder device 1220 Band variable unit 1300
  • Control unit 1400 Communication path 101
  • Network resource management unit 105-1 to 2 Variable large granularity switching unit 106
  • Bandwidth variable optical transponder (TPND) 113-1-2
  • Control function unit 117-1-2 Operation path
  • 118 Backup path 119
  • Optical transceiver 120 Client interface 125
  • Optical spectrum shaping setting unit 127 Band slot allocation setting unit 210-1-2, 211-1-2, 212 -1 to 2 Variable large granularity node device 50, 60 Associated node device 51, 61 Large granularity switching device 52, 62 Small granularity switching device 70

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Optical Communication System (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

Face à la difficulté de commuter entre canaux optiques dans un réseau optique dorsal sans provoquer d'augmentations de la consommation d'énergie ou de diminutions du rendement d'utilisation des fréquences optiques du réseau optique dans son ensemble, le dispositif de nœud optique de l'invention comprend ce qui suit : une unité de commutation à granularité grossière qui commute entre les canaux d'une pluralité de canaux, fréquence de porteuse optique par fréquence de porteuse optique ; une pluralité de dispositifs transpondeurs optiques qui émettent et reçoivent des signaux clients sur lesdits canaux ; et une unité de commande qui commande le fonctionnement de l'unité de commutation à granularité grossière et les dispositifs transpondeurs optiques. Chaque dispositif transpondeur optique possède une unité de changement de largeur de bande qui réduit la largeur de bande utilisée par les signaux clients. Lors de la détection d'un déclenchement de commutation de canaux, l'unité de commande en informe l'unité de commutation à granularité grossière et les dispositifs transpondeurs optiques. Lorsque l'unité de commutation à granularité grossière reçoit cette information, elle commute les canaux et chaque dispositif transpondeur optique envoie, sur le canal vers lequel l'unité de commutation à granularité grossière a commuté, une lumière de signaux résultant de la réduction de largeur de bande de signaux clients effectuée par cette unité de changement de largeur de bande.
PCT/JP2014/006213 2013-12-25 2014-12-12 Dispositif de nœud optique, système de communication optique et procédé de commutation de canaux optiques WO2015098028A1 (fr)

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