JP2013005388A - Optical node device and controlling method of optical node device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To inexpensively and efficiently achieve operation verification of optical components of an optical node.SOLUTION: An optical node device includes: at least one first port to which a transmitter is connected; at least one second port to which a receiver is connected; at least two third ports selectively connected only to the first port at a part, and selectively connected only to the second port at the other part; and an optical transmission path for connecting a sixth port and a seventh port which are two of the third ports. A forth port which is one of the first ports and a fifth port which is one of the second ports can be respectively connected to the sixth port and the seventh port respectively.

Description

  The present invention relates to an optical node device and an optical node device control method, and more particularly to an optical node device having a wavelength path multiplexing / demultiplexing function used in optical communication and an optical node device control method.

  In the optical communication network, the introduction of OXC technology using DWDM technology and WSS is being promoted for the advancement of networks accompanying future increase in communication volume and diversification of services. DWDM (Density Wavelength Division Multiplexing) technology enables point-to-point high-capacity connection. WSS (wavelength select switch, wavelength selective switch) and OXC (optical cross connect, optical cross-connect) technologies realize a switching function of three or more paths in an optical node device. With the introduction of WSS and OXC technologies, an optical communication network can be constructed so as to be in a more preferable form according to the usage situation.

  In an optical node device to which the DWDM technology is applied, it is desirable to arrange an optical transceiver aggregator that can connect light of a desired wavelength from a desired optical transceiver to a desired path.

  FIG. 18 is a configuration diagram of the optical transceiver aggregator described in Non-Patent Document 1. An optical transceiver aggregator 1804 shown in FIG. 18 is configured by combining a circular optical wavelength multi-polymerization demultiplexer 1803 and a matrix switch 1802 having an aggregation / multicast function. One of the input / output port groups of the matrix switch 1802 is connected to the circulating optical wavelength multi-multiplexing demultiplexer 1803, and the other is connected to the respective transmitters of the optical transceivers 1801a to 1801g constituting the optical transceiver group 1801.

  In FIG. 18, a cyclic AWG (cyclic arrayed waveguide grating, c-AWG) is used for the cyclic optical wavelength multi-polymerization demultiplexer 1803.

  The optical transceivers 1801a to 1801g are equipped with a wavelength tunable laser, and can control the transmission wavelength. The path of the matrix switch 1802 can be controlled from the outside. By providing such a configuration, the optical transceiver aggregator 1804 can freely set the wavelength and path of the light transmitted by the optical transceiver group 1801.

  Here, the optical transceiver aggregator 1804 is configured to transmit (Add) or receive (Drop) light between the predetermined path and the predetermined optical transceivers 1801a to 1801g according to the set path. Set. This transmission / reception function of the optical node device is called an Add / Drop function.

  FIG. 18 shows a configuration in which light transmitted by the transmitters of the optical transceivers 1801a to 1801g is added (added) to the path. An optical transceiver aggregator 1804 having a similar configuration can also be used to extract (drop) light received from each path in the optical transceivers 1801a to 1801g. When dropping light, the matrix switch 1802 is controlled so that the light received from the route is received by the receiver of the desired optical transceiver.

  Non-Patent Document 2 discloses a configuration of an optical mesh node device using a WSS and a transceiver aggregator. FIG. 19 is a diagram illustrating a configuration of an optical node device in which the configuration of the optical mesh node device disclosed in Non-Patent Document 2 is simplified.

  An optical node device 800 illustrated in FIG. 19 includes an optical splitter 1907, a WSS 1906, an optical transceiver aggregation device 1903, and an optical transceiver group 1901. The optical transceiver aggregating apparatus 1903 includes optical transceiver aggregators 1902a and 1902b. The optical transceiver group 1901 includes a plurality of optical transceivers. The optical transceiver is connected to the optical transceiver aggregators 1902a and 1902b.

  The optical node device 800 includes an optical splitter 1907 and a WSS 1906 at connection points of the route 1 and the route 2, respectively. The optical splitter 1907 branches light received from a certain route (for example, route 1) to another route (for example, route 2) and the optical transceiver aggregation device 1903 side.

  Here, by setting the WSS 1906 so that the route 1 and the route 2 are directly connected without going through the optical transceiver aggregating apparatus 1903, the channel that does not perform Add / Drop at the optical node remains as an optical signal. It is possible to pass (light cut-through). The optical node device 800 having the optical cut-through function may include at least as many optical transceivers as the number of paths that are simultaneously added / dropped from each path. That is, the number of optical transceivers included in the optical node device can be suppressed by the cut-through function.

  The optical transceiver aggregators 1902a and 1902b may be configured using, for example, the optical transceiver aggregator 1804 described in FIG. The optical transceiver aggregator 1902a connects internal paths so that light from the path 1 and the path 2 branched by the optical splitter 1907 is received (Drop) by a predetermined optical transceiver of the optical transceiver group 1901. The optical transceiver aggregator 1902b connects the internal paths so that the light transmitted by the optical transceivers of the optical transceiver group 1901 is transmitted (Add) to a predetermined path 1 or 2 in the predetermined path 1 or 2. .

  In relation to the present application, Patent Document 1 discloses an optical transceiver having a configuration in which an optical transceiver is looped back. Patent Document 2 discloses a configuration of a node device including an optical add / drop circuit and an optical path switching switch.

Republished patent WO2009-03811 JP 2000-354006 A

Mizutani et al, “Demonstration of multi-degree color / direction-independent waveguide-based transponder-aggregator for flexible optical path networks”, Proc. ECOC2010 P3.11, Optical Communication (ECOC), 2010 36th European Conference and Exhibition on, 2010 September B. C. Collings, “Wavelength Selectable Switches and Future Photonic Network Applications” Photonics in Switching, 2009. PS '09. International Conference on, September 2009

  In the optical node device 800 illustrated in FIG. 19, when a standby optical transceiver is selected from the optical transceiver group 1901 and a new path is connected, the selected optical transceiver may be broken. When a failed optical transceiver is selected when connecting the paths, the other optical transceiver must be reselected to reset the path. For this reason, there arises a problem that the time until the connection is completed increases and the use efficiency of the optical node deteriorates due to the search for and repair of the failed optical component. The same problem also occurs when other optical components such as a matrix switch that becomes a path of a new path are out of order.

  However, Non-Patent Document 1 and Non-Patent Document 2 do not disclose a configuration for performing operation verification of an optical component such as an optical transceiver or a matrix switch.

  As a result, in the optical transceiver aggregator 1804 shown in FIG. 18 and the optical node device 800 shown in FIG. 19, if a failure occurs in the optical component, it takes time to set up the path, and the reliability decreases. There has been a problem that the utilization efficiency of the node may decrease.

  Patent Document 1 discloses a configuration in which an optical switch is arranged in an optical transceiver and a failure of the optical transceiver itself is detected by loopback. However, the configuration described in Patent Document 1 has a problem that a failure of an optical component other than the optical transceiver cannot be detected. Furthermore, providing all optical transceivers with a loopback mechanism using an optical switch has a problem of increasing the cost of the system.

  Japanese Patent Application Laid-Open No. 2004-228561 discloses a technique related to an optical node, but does not describe a configuration for realizing an operation verification function for an optical component constituting the optical node.

[Object of invention]
An object of the present invention is to provide a technique for improving the reliability and utilization efficiency of an optical node device by performing an operation verification of an optical component used in the optical node device and detecting a failure location.

  The optical node device according to the present invention is selectively connected to at least one first port to which a transmitter is connected, at least one second port to which a receiver is connected, and a part of the first port. Connect at least two third ports that are connected and the other part is selectively connected only to the second port, and the sixth and seventh ports that are two of the third ports An optical transmission line, and a fourth port, which is one of the first ports, is connected to a sixth port, and a fifth port, which is one of the second ports, is connected to a seventh port. Configured to be possible.

  The method for controlling an optical node device according to the present invention is such that at least one second part is selectively connected only to at least one first port to which a transmitter is connected and the other part is connected to a receiver. The fourth port, which is one of the first ports, is connected to the sixth port, which is two of the third ports that are selectively connected only to the first port, and the seventh port through an optical transmission line. Are connected to the sixth port, and the fifth port, which is one of the second ports, is connected to the seventh port.

  The optical node device of the present invention has an effect of improving the reliability and utilization efficiency of the optical node device by performing the operation verification of the optical component and the detection of the failure location.

It is a block diagram of the optical node apparatus of 1st Embodiment. It is a figure which shows the operation | movement verification schedule of a standby optical transceiver group. It is a figure which shows the flow of operation | movement verification when the standby optical transceiver 1 and the standby optical transceiver 2 are selected. It is a figure which shows the control flow in the operation | movement verification shown in FIG. It is a figure which shows the connection relation of the standby optical transceiver in the procedure 1 of 1st Embodiment. It is a figure which shows the state which the transmission part and reception part of the waiting | standby optical transceiver switched. It is an example of a failure state management table. It is a figure which shows the failure location detection procedure by a failure detection control part. It is a block diagram of the optical node apparatus of 2nd Embodiment. It is a figure which shows the operation verification schedule of the standby optical transceiver group in 2nd Embodiment. It is the figure which took out the state transition for every time of the standby optical transceiver 1, the optical transceiver aggregation apparatus, and the operation verification control part, and the flow of the command from the schedule management of the optical transceiver group of FIG. It is a figure which shows the control procedure in the operation | movement verification shown in FIG. It is a figure which shows the connection relation of the standby optical transceiver in 2nd Embodiment. It is a figure which shows the verification procedure of wavelength variable control. It is a figure which shows the failure location detection control procedure by a failure detection control part. It is a figure which shows the schedule of the operation verification control part and standby optical transceiver group in 3rd Embodiment. It is a figure which shows the connection relation of the standby optical transceiver at the time of using an aggregation / multicast function. It is a block diagram of the optical transceiver aggregator described in the nonpatent literature 1. It is a figure which shows the structure of the optical node apparatus which simplified the structure of the optical mesh node apparatus disclosed by the nonpatent literature 2. FIG. It is a structural example of the optical node of 4th Embodiment.

[Description of configuration]

[First Embodiment]
Next, a first embodiment of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a configuration diagram of an optical node device according to a first embodiment of this invention. The optical node device 100 of FIG. 1 includes optical transceiver aggregators 104a and 104b, a loopback optical fiber 109, and an optical transceiver group 101. The optical node device 100 further includes an operation verification control unit 105 and a failure detection control unit 106.

  The optical node device 100 is connected to an optical fiber group composed of optical fibers connected to routes 1 to x of the optical network, and transmits / receives light to / from the optical fiber group connected to x routes (Add). / Drop). The optical node device 100 includes an optical transceiver aggregator 104a on the drop side that receives an optical signal from the optical fiber group, and an optical transceiver aggregator 104b on the add side that transmits the optical signal to the optical fiber group.

  The optical transceiver aggregator 104a includes a wavelength multiple polymerization demultiplexer 103 provided for each of the paths 1 to x and a matrix switch 102a. The optical transceiver aggregator 104b includes a wavelength multiple demultiplexer 103 provided for each of the paths 1 to x and a matrix switch 102b. The matrix switches 102a and 102b can be realized by using, for example, a MEMS (Micro Electro Mechanical Systems) based switch. Here, the same wavelength multi-polymerization demultiplexer 103 may be used for each path of the optical transceiver aggregators 104a and 104b.

  On the optical fiber group side of the matrix switches 102a and 102b, the number of ports “(number of paths × number of wavelength multiplexing) +1” is prepared. Each port on the demultiplexing side of the wavelength multiplexing demultiplexer 103 is connected to each port on the optical fiber group side of the matrix switches 102a and 102b. One port on the optical fiber group side of each of the matrix switches 102 a and 102 b is connected to each other by a loopback optical fiber 109.

  On the other hand, an optical transceiver group 101 including optical transceivers of the number corresponding to the Add / Drop rate in the optical node device is connected to the ports on the optical transceiver side of the matrix switches 102a and 102b.

  In the first embodiment, for example, consider a case where the number of routes is 3, the number of wavelength multiplexing in each route is 50, and the Add / Drop rate is 20% at the maximum. The Add / Drop rate is the ratio of paths that are simultaneously added / dropped in the optical node device, out of the total number of paths to each path. When the number of routes is 3 and the number of multiplexed wavelengths in each route is 50, the total number of paths on each route side (optical fiber group side in FIG. 1) is 50 × 3 = 150. Therefore, if the Add / Drop rate is 20%, 150 × 0.2 = 30 optical transceivers are arranged for Add / Drop.

  That is, the required number of ports on the optical fiber group side of the matrix switches 102a and 102b is 151 ports by adding one port for the loopback optical fiber 109 to 150 ports. On the other hand, the number of ports on the optical transceiver side of the matrix switch is as many as the number of optical transceivers, that is, 30 ports. Therefore, the size of the matrix switch used in the first embodiment is 151 × 30 ports.

  Further, the optical node device 100 includes an operation verification control unit 105 and a failure detection control unit 106, and controls each optical transceiver and the optical transceiver aggregators 104a and 104b of the optical transceiver group 101. The optical node device 100 includes a control unit for performing an Add / Drop operation. However, since those configurations are known and are not directly related to the contents of the present application, description and explanation in the drawings are omitted here.

[Description of operation]
The operations of the operation verification control unit 105 and the failure detection control unit 106 in the first embodiment will be described below.

  First, a description will be given of scheduling means for a standby optical transceiver (hereinafter referred to as a “standby optical transceiver”) that is not used for operation verification.

  The operation verification control unit 105 selects two standby optical transceivers from the optical transceiver group connected to the optical transceiver aggregators 104a and 104b. The operation verification control unit 105 includes schedule means for operating the selected standby optical transceiver at a predetermined time and starting the operation verification processing of the transmitter and the receiver in the standby optical transceiver.

  FIG. 2 shows an operation verification schedule of the standby optical transceiver group 203. The standby optical transceiver group 203 represents a set of n standby optical transceivers 1 to n. The operation verification control unit 105 performs operation verification of the standby optical transceivers 1 to n during the periodic verification period 201. In the verification period 201, the operation verification control unit 105 selects two standby optical transceivers in order, and performs the operation verification of the standby optical transceiver selected in the procedure described later. When the operation verification of all the standby optical transceivers 203 is completed, the failure detection control unit 106 detects a failure location according to the verification result.

  The failure detection control unit 106 detects a failure location when a problem occurs in the operation verification. When a predetermined waiting period 202 elapses after the verification period 201 ends, the operation verification control unit 105 starts verification again.

  The operation verification control unit 105 suppresses power consumption by stopping unnecessary functions during the standby period 202 during which the operation verification of the standby optical transceiver is not performed. Further, by continuously performing the operation verification of the selected standby optical transceiver, it is possible to shorten the waiting time due to the startup and shutdown of the standby optical transceiver and to increase the standby period 202. As a result, power consumption of the operation verification control unit 105 can be suppressed.

  The length of the standby period 202 may be determined according to the reliability required for the network to which the optical node device 100 is connected. For example, it is possible to set the standby period as midnight when the network usage is small during the day and schedule the operation verification every other hour. By performing the operation verification periodically at a time when the network is used frequently, the standby optical transceiver for which the operation verification was performed immediately before use can be shifted from the standby state to the operation state. Or, conversely, the peak power consumption of the optical node device may be suppressed by performing the operation verification in a time zone in which the amount of use of the network is small.

  In addition, the start-up time of the optical transceiver is different for each functional unit inside. For this reason, in order to stop the function unit having a long activation time during the standby period, it is necessary to lengthen the standby time 202. That is, by appropriately setting the standby period 202, it is possible to stop unnecessary functions of each optical transceiver, and it is possible to further suppress power consumption of the optical node device 100. The activation time of the standby optical transceiver in which the predetermined functional unit is stopped and is in the low power consumption state is about 50 msec to 10 sec. Therefore, in the above-described schedule, even if the optical transceiver has a relatively long activation time, all the functions can be stopped during the standby period.

  However, in order to shorten the time required to allocate a new path, it is necessary to be able to start the standby optical transceiver at high speed. For this reason, in some standby optical transceivers, a function unit having a relatively long startup time may be left operating, and the standby optical mode may be set as a standby mode that can be started at high speed. Then, only the standby optical transceiver in the standby mode that can be activated at high speed is verified, and the other standby optical transceivers may be stopped in the standby mode with low power by stopping the function unit having a relatively long activation time. .

  Next, the operation verification control of two standby optical transceivers selected from the operation verification control unit by the above-described schedule will be described based on the control flow of FIG.

  FIG. 3 is a diagram showing a flow of operation verification when the standby optical transceiver 1 and the standby optical transceiver 2 are selected from the standby optical transceiver group 203 of FIG. FIG. 3 shows state transitions and command flows of the standby optical transceivers 1 and 2, the optical transceiver aggregator 104, and the operation verification control unit 105. Here, the optical transceiver aggregators 104a and 104b are collectively referred to as an optical transceiver aggregator 104. FIG. 4 is a diagram showing a control flow in the operation verification shown in FIG. The flow of operation verification will be described in the following procedure 1 to procedure 7. In the following description, a1 to a21 correspond to the respective flows in FIG. 3 and the respective procedures in FIG.

(Procedure 1) Selection of Standby Optical Transceiver to Perform Operation Verification The operation verification control unit 105 selects two standby optical transceivers 1 and 2 to perform operation verification from the standby optical transceiver group 203. Then, the operation verification control unit 105 issues a start instruction to the selected standby optical transceivers 1 and 2 (a1). The two standby optical transceivers shift to the continuity evaluation mode in accordance with an activation instruction from the operation verification control unit 105 (a2, a3). The continuity evaluation mode is a mode for performing a continuity time evaluation between the standby optical transceivers 1 and 2. The transmission side of each standby optical transceiver includes means for transmitting an OTN (Optical Transport Network) frame having a short frame length in the continuity evaluation mode. The reception side of the standby optical transceiver includes means for receiving the OTN frame in the continuity evaluation mode and determining whether the received OTN frame has been correctly received.

  FIG. 5 is a diagram illustrating a connection relationship between the standby optical transceivers 1 and 2 in the procedure 1 of the first embodiment. The operation verification control unit 105 issues a path setting instruction to the optical transceiver aggregator 104 so that the standby optical transceiver 1 and the standby optical transceiver 2 are connected by the loopback optical fiber 109 as shown in FIG. a4). Based on this instruction, the matrix switch 102 b connects the standby optical transceiver 1 and the loopback optical fiber 109. Further, based on this instruction, the matrix switch 102a connects the loopback optical fiber 109 and the standby optical transceiver 2.

(Procedure 2) Start-up time confirmation (standby optical transceiver 1 → 2)
The startup time 301 is the total startup time determined from the path setup time of the optical transceiver aggregator and the startup time of the standby optical transceiver. When the standby optical transceiver 2 detects the optical signal, it returns that fact to the operation verification control unit 105. The operation verification control unit 105 obtains a difference between the time when the reply is received and the time when the activation instruction is issued, and confirms the activation time 301 (a5).

  If the activation time 301 is within a predetermined time, that fact is recorded in the memory. And it progresses to the following procedure 3 (a6) and the conduction time is confirmed.

  If there is a problem such as the start-up time 301 exceeding a predetermined time, there may be a problem in the optical path of the transmitter of the standby optical transceiver 1, the receiver of the standby optical transceiver 2, or the optical transceiver aggregator 104. There is. In this case, the fact that there is a problem with the confirmation result of the activation time 301 is recorded in the memory, and the operation verification of the standby optical transceivers 1 and 2 is finished. Then, the operation proceeds to the operation verification of the next standby optical transceiver (a21). The failure location is detected by the failure detection control unit 106 after the operation verification is completed.

  Here, a storage device such as a semiconductor memory or a hard disk can be used as the memory, but is not limited thereto. The place where the memory is provided is not particularly limited, and for example, the operation verification control unit 105 may include the memory.

(Procedure 3) Conduction time confirmation (standby optical transceiver 1 → 2)
In procedure 3, the conduction time 302, which is the time until the standby optical transceivers facing each other are synchronized and conduction starts, is confirmed. In procedure 1, the two standby optical transceivers 1 and 2 are set to the conduction evaluation mode. The standby optical transceiver 2 on the receiving side checks whether the OTN frame is normally received. The standby optical transceiver 2 sends a continuity confirmation signal from the standby optical transceiver 2 to the operation verification control unit 105 when the OTN frame is continuously received a predetermined number of times. The operation verification control unit 105 obtains a difference between the time when the continuity confirmation signal is received and the time when the activation instruction is issued, and confirms the continuity time 302 (a6).

  If the conduction time 302 is within a predetermined time, that effect is recorded in the memory. Then, the process proceeds to procedure 4.

  If there is a problem such that the conduction time 302 exceeds a predetermined time, there is a possibility that there is a problem in at least one of the synchronization circuits of the standby optical transceivers 1 and 2. In this case, the fact that there is a problem in the confirmation result of the conduction time is recorded in the memory, and the operation verification of the standby optical transceivers 1 and 2 is finished. Then, the operation proceeds to the operation verification of the next standby optical transceiver (a21). The failure location is specified by the failure detection control unit 106 after the operation verification is completed.

(Procedure 4) Functional verification (standby optical transceiver 1 → 2)
The operation verification control unit 105 notifies the two standby optical transceivers 1 and 2 of the change to the function verification mode. Based on the notification, the standby optical transceivers 1 and 2 shift to the function verification mode (a7, a8), and the function verification is performed (a9). The function verification in the first embodiment is the following two types. In the first function verification, a test pattern of specific “0” and “1” signals is prepared, and it is verified whether the signal can be transmitted error-free. The second functional verification is functional verification related to error correction. In the second function verification, continuity is confirmed using a frame including an error as a test pattern to verify whether the error correction function is operating correctly in the optical transceiver 2 on the receiving side.

  If there is no problem in the function verification in the procedure 4, the fact is recorded in the memory. Then, the process proceeds to the next procedure 5 to switch between the transmitter and the receiver to check the activation time.

  If there is a problem in the function verification in the procedure 4, there is a possibility that there is a problem in the electric circuit portion of at least one of the optical transceivers. In this case, the fact that there is a problem in the function verification result is recorded in the memory, and the operation verification of the standby optical transceivers 1 and 2 is finished. Then, the operation proceeds to the operation verification of the next standby optical transceiver (a21). The failure location is specified by the failure detection control unit 106 after the operation verification is completed.

(Procedure 5) Start-up time confirmation (standby optical transceiver 2 → 1)
In the procedure 5, the same procedure as the procedure 1 is performed on the new path in the direction from the standby optical transceiver 2 to the standby optical transceiver 1. The operation verification control unit 105 instructs the standby optical transceivers 1 and 2 to switch between the transmitter and the receiver and set each to the conduction evaluation mode. Based on the instruction, the standby optical transceivers 1 and 2 enter the function verification mode (a10, a11). At this time, the transmission light of the standby optical transceiver 1 is changed to an off state so that unnecessary light does not leak to the network. Also, the optical transceiver aggregator 104 is instructed to set a path from the standby optical transceiver 2 to the standby optical transceiver 1. Based on the instruction, the optical transceiver aggregator 104 sets a path from the standby optical transceiver 2 to the standby optical transceiver 1 (a12).

  FIG. 6 is a diagram illustrating a state in which the transmitting unit and the receiving unit of the standby optical transceivers 1 and 2 are switched in the procedure 5. In FIG. 6, the light output from the transmitter of the standby optical transceiver 2 is received by the receiver of the standby optical transceiver 1 via the matrix switch 102b, the loopback optical fiber 109, and the matrix switch 102a.

  Thereafter, the activation time 303 determined from the path setting time of the optical transceiver aggregator 104 and the activation time of the standby optical transceivers 1 and 2 measured in the same manner as in the procedure 5 is evaluated. That is, when the optical transceiver 1 on the receiving side detects an optical signal, it returns a message to that effect to the operation verification control unit 105. The operation verification control unit 105 obtains a difference between the time when the reply is received and the time when the activation instruction is issued, and confirms the activation time 303 (a13).

  If the activation time 303 is within a predetermined time, that fact is recorded in the memory. And it progresses to the following procedure 6 (a14) and confirms conduction | electrical_connection time. If there is a problem such as the start-up time 303 exceeds a predetermined time, there may be a problem with the transmitter of the standby optical transceiver 2, the receiver of the standby optical transceiver 1, or the optical components of the optical transceiver aggregator 104. is there. In this case, the fact that there is a problem with the confirmation result of the activation time 303 is recorded in the memory, and the operation verification of the standby optical transceivers 1 and 2 is finished. Then, the operation proceeds to the operation verification of the next standby optical transceiver (a21). The failure location is specified by the failure detection control unit 106 after the operation verification is completed.

(Procedure 6) Conduction time confirmation (standby optical transceiver 2 → 1)
In procedure 6, the same verification as in procedure 3 is performed in the direction from standby optical transceiver 2 to standby optical transceiver 1.

  In the procedure 6, the time 304 from the start instruction to the standby optical transceivers 1 and 2 until the communication from the standby optical transceiver 2 to the standby optical transceiver 1 is synchronized and conducted is confirmed. In procedure 5, the two standby optical transceivers are set to the continuity evaluation mode. Then, the standby optical transceiver 1 on the receiving side monitors whether or not the OTN frame is normally received. When the standby optical transceiver 1 detects that the OTN frame has been continuously received a predetermined number of times, the standby optical transceiver 1 sends a continuity confirmation signal from the standby optical transceiver 1 to the operation verification control unit 105. The operation verification control unit 105 obtains a difference between the time when the continuity confirmation signal is received and the time when the activation instruction is issued, and confirms the continuity time 304 (a14).

  If the conduction time 304 is within a predetermined time, that fact is recorded in the memory. Then, the process proceeds to the next step 7 to perform function verification. If there is a problem such as the delay of the conduction time 304 being large and exceeding a predetermined time, the fact that there is a possibility that there is a problem in the synchronization circuit of at least one standby optical transceiver is recorded in the memory. The operation verifications 1 and 2 are completed. Then, the operation proceeds to the operation verification of the next standby optical transceiver (a21). The failure location is specified by the failure detection control unit 106 after the operation verification is completed.

(Procedure 7) Functional verification (standby optical transceiver 2 → 1)
For the new optical path (standby optical transceiver 2 → 1), functional verification similar to that in the procedure 4 is performed.

  The operation verification control unit 105 notifies the standby optical transceivers 1 and 2 of the change to the function verification mode. Based on the notification, the standby optical transceivers 1 and 2 shift to the function verification mode (a15, a16), and the function verification is performed (a17).

  If there is no problem in the function verification, the fact is recorded in the memory, and the function verification of the standby optical transceivers 1 and 2 is finished. Then, the operation of the next standby optical transceiver is verified.

  When a series of operation verifications are completed, the standby optical transceivers 1 and 2 wait in a standby mode in which the optical output is stopped (a18, a19). The optical transceiver aggregator 104 sets the paths of the standby optical transceivers 3 and 4 that perform the next operation verification (a20).

  If a problem is found during functional verification, there may be a problem with the electrical circuit of at least one standby optical transceiver. In this case, the fact that there is a problem in the function verification result is recorded in the memory, and the operation verification of the standby optical transceivers 1 and 2 is finished. Then, after the operation verification is completed, the failure detection control unit 106 detects the failure location.

  By performing the operation verification procedure of the above procedure 1 to procedure 7 on all the standby optical transceivers 1 to n of the standby optical transceiver group 203, the operation verification of the standby optical transceiver group 203 and the optical transceiver aggregators 104a and 104b is performed. Is called. Based on the operation verification result, it is possible to select an optical transceiver in which no failure has been found when a new path is set up.

  Next, failure detection control will be described. FIG. 7 is an example of a failure state management table. The failure state management table is created based on the operation verification result recorded in the memory in the steps 1-7. In the failure state management table, the number of the standby optical transceiver for which the operation has been verified, the procedure in which the problem occurred on the transmission side and the reception side, and the content of the problem are recorded.

  In the operation verification performed with the transmitter and the receiver facing each other, it may be difficult to know whether the transmitter or the receiver has a failure. For this reason, even if only one of the optical transceivers has failed, both of the optical transceivers have to be treated as a failure once. However, in the optical node device 100 according to the first embodiment, it is possible to determine which optical transceiver has failed by the following failure detection procedure. It is also possible to detect that the matrix switch 102a or 102b has failed. As a result, it becomes possible to efficiently identify the failure location of the optical component included in the optical node device 100.

  FIG. 8 is a diagram showing a failure location detection procedure by the failure detection control unit 106. In the following description, s1 to s8 correspond to the respective procedures in FIG.

  In FIG. 8, first, the presence / absence of an optical transceiver determined as “abnormal” from the failure state management table is confirmed (s1). If there is an abnormal optical transceiver (s1: Yes), select one of the standby optical transceivers that are abnormal and one of the standby optical transceivers that is known to be in a normal state. (S2, s3). In these two optical transceivers, the operation verification procedure shown in steps 1 to 7 is performed again (s4).

  If a problem occurs due to this verification (s5: present), it is determined that the abnormal optical transceiver has failed, and the optical transceiver is deleted from the selection target at the time of path setting (s6). On the other hand, when no problem occurs in the operation verification in s4 (s5: None), the description in the failure state management table is corrected (s7). That is, in s7, the state of the standby optical transceiver that is recorded as a failure state on the failure state management table is corrected to a normal state.

  Thereafter, the confirmation of the presence / absence of the standby optical transceiver that is abnormal on the failure state management table is repeated. When the “abnormal” state disappears in the standby optical transceiver that has not been deleted from the selection targets at the time of path setting (s1: none), the failure location detection control is terminated (s8).

  Here, consider a case where two standby optical transceivers determined to be in a failure state in the first operation verification are determined to be normal in the failure detection procedure (s7). In such a case, there is no abnormality in the standby optical transceiver at the time of operation verification, and at least one of the optical transceiver aggregators 104a and 104b may be broken. For example, there is a case where a part of the matrix switch 102a or 102b has failed and an influence appears only on the path formed at the time of operation verification.

  In such a case, an operation test is performed while changing the paths set in the matrix switches 102a and 102b using a normal standby optical transceiver, and a faulty optical component (standby It is possible to narrow down the optical transceivers or optical transceiver aggregators 102a, 102b) or their fault locations.

  Information on the optical component determined to be a failure in the failure detection procedure is separately notified to the administrator. The administrator replaces or repairs the optical component as necessary based on the execution result of the failure detection control and the description of the abnormal part of the failure state management table. Also in replacement or repair of the optical transceiver, it is possible to know from the execution result of the failure detection procedure whether a failure has occurred in either the transmitter or the receiver, or whether the optical transceiver aggregator 102a, 102b has failed. For this reason, the cost required for investigating, replacing and repairing the cause of failure of the optical component used in the optical transceiver and the optical node device is reduced.

  As described above, the optical node device according to the first embodiment can perform the operation verification of the standby optical component and the detection of the failure location. As a result, the optical node device according to the first embodiment has an effect that the reliability and utilization efficiency of the optical node device can be improved.

  In addition, since the optical node device according to the first embodiment can detect a failed optical component or a failure location thereof, there is an effect that it is possible to reduce an operation cost associated with an optical node failure investigation.

  The optical node device 100 according to the first embodiment may be configured not to include the optical transceiver group 101.

  Furthermore, the optical node device according to the first embodiment is also realized with the following minimum configuration. In other words, the optical node device includes at least one first port to which the transmitter is connected and at least one second port to which the receiver is connected. The optical node device includes at least two third ports, some of which are selectively connected only to the first port and the other portions are selectively connected only to the second port. Further, the optical node device includes an optical transmission path that connects the sixth port and the seventh port, which are two of the third ports. The fourth port, which is one of the first ports, is configured to be connectable to the sixth port, and the fifth port, which is one of the second ports, is connectable to the seventh port.

  The optical node device having such a minimum configuration connects the transmitter of the waiting optical transceiver to the fourth port which is one of the first ports. Then, the receiver of the waiting optical transceiver is connected to the fifth port which is one of the second ports.

  By connecting the transmitter, the receiver and the optical node device in this way, the light transmitted by the transmitter can be received by the receiver via the optical node device.

  That is, as with the optical node device 100 described with reference to FIG. 1, the optical node device having the above-described minimum configuration is the same as the optical node device according to the first embodiment. And can be done. As a result, the optical node device having the minimum configuration also has the same effect as the optical node device 100.

[Second Embodiment]
[Description of configuration]
Next, a second embodiment of the present invention will be described in detail with reference to the drawings.

  FIG. 9 is a configuration diagram of an optical node device according to the second embodiment of this invention. Referring to FIG. 9, the optical node device 200 according to the second embodiment includes optical transceiver aggregators 907a and 907b, a loopback optical fiber 904, and an optical transceiver group 901. Furthermore, the optical node device 200 includes an operation verification control unit 905 and a failure detection control unit 906.

  The optical transceiver aggregator 907a includes a recursive optical wavelength multi-polymerization demultiplexer 903 having a recursive property for multiplexing / demultiplexing wavelengths, a matrix switch 902a having an aggregation / multicast function, and a wavelength variable selection filter 908. The optical transceiver aggregator 907b includes a recursive optical wavelength multiple polymerization demultiplexer 903 and a matrix switch 902b having an aggregation / multicast function.

  The aggregation / multicast function is a function for using the matrix switches 902a and 902b as an optical splitter or an optical coupler. With the aggregation / multicast function, it is possible to distribute the light input to the matrix switch to a plurality of optical paths and to merge the lights on the plurality of optical paths.

  In the optical node device 200, a recurring AWG similar to that described in Non-Patent Document 1 is used as the recurring optical wavelength multiple polymerization demultiplexer 903. Further, as the matrix switches 902a and 902b having an aggregation / multicast function, matrix switches using Mach-Zehnder interferometer type switches created by PLC are used. The matrix switches 902a and 902b can realize the aggregation / multicast function by precisely controlling the intermediate state of the Mach-Zehnder interferometer type switch.

  The circulating optical wavelength multiple polymerization demultiplexer 903 includes ports for the number of connected paths on the optical fiber group side (multiplexing side). Each port on the optical fiber group side is connected to the optical network by a corresponding route. In addition, the optical transceiver group side (demultiplexing side) of the recursive optical wavelength multiplexing / demultiplexing demultiplexer 903 is provided with ports corresponding to the number of multiplexed wavelengths in each path. Connected to the network port.

  On the optical transceiver group side of the matrix switches 902a and 902b, ports of the maximum number of Add / Drop in the optical node 200 are provided. An optical transceiver group 901 is connected to the matrix transceivers 902a and 902b on the optical transceiver group side. Here, on the drop side, a variable wavelength selection filter 908 is arranged between the matrix switch 902a and the optical transceiver group 901 in order to extract an arbitrary desired wavelength from the wavelength multiplexed signal multicast by the matrix switch 902a.

  On the optical fiber group side of the matrix switches 902a and 902b, a port having one port more than the number of routes is provided. The matrix switch 902b and the matrix switch 902a are connected to each other by a loopback optical fiber 904.

  The optical node device 200 includes an operation verification control unit 905 and a failure detection control unit 906 that perform control for operation verification of a standby optical transceiver that is not used. The operation verification control unit 905 controls the optical transceiver group and the optical transceiver aggregators 907a and 907b. The failure detection control unit 906 detects a failure part based on the result of the operation verification.

  The optical node device 200 includes an existing control unit that controls a normal Add / Drop operation. However, the configuration for performing the Add / Drop operation is well known and is not directly related to the present application. The description and the detailed description are omitted.

  In the second embodiment, the sizes of the matrix switches 902a and 902b can be further reduced as compared with the first embodiment. For example, as in the first embodiment, consider an optical node device in which the number of paths is 3, the number of wavelength multiplexing in each path is 50, and the Add / Drop rate is 20% at maximum. In the optical node device 200 according to the second embodiment, light of three wavelengths corresponding to the three paths is multiplexed at each port on the optical transceiver side of the circulating optical wavelength multi-multiplexing demultiplexer 903. ing. For this reason, the number of ports on the optical transceiver side of the circulating optical wavelength multiple demultiplexer 903 may be 50, which is one third of the number of wavelengths 150. As a result, the number of ports of the matrix switches 902a and 902b is 151 × 30 in the first embodiment, but can be reduced to 51 × 30 in the second embodiment. This is because the optical signal is also wavelength-multiplexed at the port on the optical transceiver side of the circulating optical wavelength multiple demultiplexer 903. Therefore, in the second embodiment, it is possible to further reduce the size of the apparatus and reduce the cost as compared with the first embodiment.

[Description of operation]
The operations of the operation verification control unit 905 and the failure detection control unit 906 for the standby optical transceiver group in the second embodiment will be described below.

  First, the scheduling means in the operation verification control will be described. FIG. 10 shows an operation verification schedule of the standby optical transceiver group in the second embodiment. The operation verification control unit 905 shown in FIG. 9 operates the standby optical transceiver group (1001 in FIG. 10) connected to the optical transceiver aggregators 907a and 907b one by one at a predetermined time, Scheduling means for starting operation verification processing of the transmitter and the receiver in the transceiver is provided.

  The operation verification control unit 905 operates periodically, and performs operation verification of one optical transceiver in the verification period 1002. When a problem is found in the operation verification, the failure detection control unit 906 detects a failure location. This operation is repeated in all standby optical transceivers. In the second embodiment, the verification interval 1003 is 5 minutes. In the schedule of the second embodiment, at the time of verification, operation verification of at least one standby optical transceiver is performed.

  When it becomes necessary to newly set one path, it is only necessary to verify the operation of at least one optical transceiver. Therefore, in the second embodiment, light for operation verification is transmitted / received using only one optical transceiver according to the settings of the matrix switches 902a and 902b.

  Next, a procedure for verifying the operation of the standby optical transceiver according to the schedule shown in FIG. 10 will be described with reference to FIGS.

  FIG. 11 shows the state transition and command flow of the standby optical transceiver 1, the optical transceiver aggregators 907a and 907b, and the operation verification control unit 905 from the operation verification schedule of the standby transceiver group 1001 shown in FIG. It is shown. Hereinafter, the optical transceiver aggregators 907a and 907b are collectively referred to as an optical transceiver aggregator 907. FIG. 12 is a diagram showing a control procedure in the operation verification shown in FIG. Hereinafter, the procedures 1 to 7 will be described in order. In the following description, b1 to b10 correspond to the respective procedures in FIG.

(Procedure 1) Selection of Standby Optical Transceiver The operation verification control unit 905 selects one standby optical transceiver that performs operation verification from the standby optical transceiver group 1001. Then, the operation verification control unit 905 issues an activation instruction to the standby optical transceiver 1 selected in procedure 1 (b1). The standby optical transceiver 1 shifts to the continuity evaluation mode based on the activation instruction from the operation verification control unit 905 (b2). The continuity evaluation mode is the same as that in the first embodiment.

  FIG. 13 is a diagram illustrating a connection relationship of standby optical transceivers according to the second embodiment. The operation verification control unit 905 issues a path setting instruction to the optical transceiver aggregator 907 so that the output of the transmitter of the standby optical transceiver 1 is received by the receiver of the standby optical transceiver 1 through the path illustrated in FIG. . The matrix switches 902a and 902b connect paths so that the light transmitted by the standby optical transceiver 1 is received by the standby optical transceiver 1 via the matrix switch 902a, the loopback optical fiber 904, and the matrix switch 902b (b3).

(Procedure 2) Confirmation of Start-up Time The standby optical transceiver 1 detects the optical signal output from the transmitter by the receiver, and then returns to the operation verification control unit 905 that the optical signal has been detected. The operation verification control unit 905 obtains a difference between the time when the reply is received and the time when the activation instruction is issued, and confirms the activation time 1101 (b4).

  If the startup time 1101 is within a predetermined time, that fact is recorded in the memory, and the conduction time confirmation in the next procedure 3 is performed. If the start time 1101 exceeds a predetermined time, the check result of the start time is recorded in the memory because there is a problem with the optical component of the transmitter, receiver or optical transceiver aggregator of the standby optical transceiver 1, and after the operation verification is completed A failure location is detected by the failure detection control unit 906 (b10).

(Procedure 3) Confirmation of conduction time Similar to the procedure 3 in the first embodiment, the conduction time 1102 is confirmed. After detecting that the reception of the OTN frame has been continuously received a predetermined number of times at the receiver of the standby optical transceiver 1, the standby optical transceiver 1 sends a conduction confirmation signal to the operation verification control unit 905. The operation verification control unit 905 obtains a difference between the time when the continuity confirmation signal is received and the time when the activation instruction is issued, and confirms the continuity time 1102 (b5).

  If the conduction time 1102 is within a predetermined time, that fact is recorded in the memory, and the operation verification of the procedure 4 is performed. When the conduction time 1102 exceeds a predetermined time, the confirmation result of the conduction time is recorded in the memory because there is a possibility that there is a problem with the synchronization circuit of the standby optical transceiver 1, and the failure detection control unit 906 detects the failure location. (B10).

(Procedure 4) Function Verification The operation verification control unit 905 notifies the standby optical transceiver 1 of the change to the function verification mode (b6). Based on the notification, the standby optical transceiver 1 shifts to the function verification mode, and the function verification is performed by the operation verification control unit 905 (b7). In the function verification in the second embodiment, wavelength variable control verification of the standby optical transceiver 1 and the wavelength variable selection filter 908 is performed in addition to the two types of function verification shown in the procedure 4 of the first embodiment. The two types of function verification shown in the procedure 4 of the first embodiment are the same in the second embodiment except that the standby optical transceivers to be transmitted and received are the same, and the description thereof will be omitted.

  The wavelength variable control verification is to verify the wavelength variable characteristics of the standby optical transceiver 1 and the wavelength variable selection filter 908 connected thereto. FIG. 14 shows a verification procedure of wavelength variable control. The set wavelength at the time of standby of the variable wavelength selection filter 908 and the transmitter of the standby optical transceiver 1 is determined as a default value of the optical node device 200. In the second embodiment, the standby set wavelength is set at the center wavelength λc of the wavelength band to be used. The verification of the start-up time and the conduction time and the function verification performed in the procedure 2 and the procedure 3 may be performed at the initial wavelength λc.

  In the variable wavelength verification, as shown in FIG. 14, first, the transmission wavelength of the variable wavelength selection filter 908 is changed from λc to the evaluation wavelength λx (s21). It is confirmed that the light received by the receiver is blocked by changing the transmission wavelength of the variable wavelength selection filter 908 (s22, s23). If the light is not blocked in s23, it is determined that the wavelength variable selection filter 908 has failed (s30).

  Thereafter, the wavelength of the standby optical transceiver 1 is changed from λc to λx for evaluation (s24). If the light is blocked in s23, it is confirmed that the light is detected again by the receiver (s25, s26). If light is detected, it is determined that there is no abnormality (s27), and the set wavelengths of the variable wavelength selection filter 908 and the standby optical transceiver 1 are changed from λx to λc (s28). If no light is detected in s26, it is determined that the standby optical transceiver 1 has failed (s29). Thereby, the function verification of the wavelength variable function of the standby optical transceiver 1 and the wavelength variable filter 908 and the detection of the failure part can be performed.

  If there is no problem after verifying the operation of one standby optical transceiver, the wavelengths of the optical transceiver 1 and the wavelength variable selection filter 908 are returned from λx to λc, and the transmitter waits in a standby mode in which the optical output is stopped. (B8). The optical transceiver aggregator 907 sets the optical path of the standby optical transceiver 2 that performs the next operation verification (b9). If there is no problem in performing the operation verification of the standby optical transceiver, the operation detection to the standby optical transceiver 2 may be started without activating the failure detection control unit 906.

  If a problem occurs in the function verification in the procedure 4, it is recorded in the memory that the electrical circuit of the standby optical transceiver 1 may be broken, and the failure detection control unit 906 detects the failure point (b10). ).

  As described above, in the second embodiment, the optical transceivers 902a and 902b are used without increasing the cost of the optical node device by using the wavelength variable selection filter 908 that is originally provided in the optical transceiver aggregator 907a for operation verification. In addition, the operation of the wavelength variable selection filter 908 can be verified.

  Also in the first embodiment, it is possible to verify the same wavelength variable control as in the second embodiment by separately preparing the wavelength variable selection filter 908.

  Next, failure detection control performed by the failure detection control unit 906 will be described. FIG. 15 shows a failure location detection control procedure by the failure detection control unit.

  In FIG. 15, when an abnormality is confirmed in the operation verification (s31: abnormal), one normal optical transceiver is selected (s32). Here, the standby optical transceiver that has been evaluated before the standby optical transceiver 1 in which the failure is detected is selected. Then, the two optical transceivers of the standby optical transceiver 1 in which the failure is detected and the normal standby optical transceiver are made to face each other, and the operation verification and the failure detection procedure of the procedure 1 to the procedure 7 of the first embodiment are performed. (S33). By this verification, the failure location of the failed optical component in the optical node device is detected.

  If an abnormality is confirmed again in the standby optical transceiver 1, the standby optical transceiver 1 is deleted from the selection target at the time of path setting so that the standby optical transceiver 1 is not used in the node (s34). Then, the operation verification of another waiting optical transceiver is continued according to the schedule of FIG. 10 and the operation verification flow of FIG. 12 (s35). If no problem occurs in the operation verification, the failure location detection procedure is not performed, and the operation verification of another waiting optical transceiver is performed (s35).

  Here, consider a case where the standby optical transceiver 1 determined to be in the failure state in the operation verification is determined to be normal in the failure detection procedure. In such a case, there is no abnormality in the standby optical transceiver 1, and there is a possibility that at least one of the optical transceiver aggregators 907a and 907b has failed. For example, there is a case where a part of the MEMS constituting the matrix switches 902a and 902b has failed, and the influence of the failure appears only on the path formed at the time of operation verification.

  In such a case, by performing an operation test while changing the paths set in the matrix switches 902a and 902b using a standby optical transceiver and investigating the conditions under which an abnormality occurs, the failed optical component or its failure location It is possible to narrow down. Information on the optical component determined to be faulty is separately notified to the administrator, and replaced or repaired as necessary.

  In the second embodiment, the operation verification of the standby optical transceiver and the detection of the failure part are performed one by one. For this reason, since the failure part by operation verification can be investigated more easily, the cost required for replacement or repair of the failed optical component is reduced. In the second embodiment, it is not necessary to record the operation verification results of all other standby optical transceivers in the failure state management table. Therefore, it is possible to reduce the amount of memory used for the failure state management table.

  Further, the optical node device according to the second embodiment performs the operation verification using only one optical transceiver in this way, thereby simplifying the configuration of the operation verification control unit 905 and the failure detection control unit 906. There is an effect that can be done. In the first embodiment, the operation verification control unit 105 needs to manage two optical transceivers. In contrast, in the second embodiment, only one optical transceiver is required to be managed by the operation verification control unit 905 during the operation verification. As a result, in the second embodiment, compared with the first embodiment, the control performed by the operation verification control unit 905 is simplified, and the cost and power consumption of the operation verification control unit 905 can be reduced. In addition, in order to show the failure location to the administrator, a management table may be prepared and the failure content may be recorded.

  As described above, the optical node device according to the second embodiment uses the recursive optical wavelength multi-polymerization demultiplexer, so that the size and cost can be further reduced in addition to the effects of the first embodiment. There is an effect that is possible.

[Third Embodiment]
Next, a third embodiment of the present invention will be described. The configuration of the optical node device of the third embodiment is the same as that of the optical node device 200 of the second embodiment shown in FIG. 9, but the schedule management for the standby optical transceiver is different.

  FIG. 16 shows a schedule of the operation verification control unit and the standby optical transceiver group in the third embodiment. The standby optical transceiver group 1601 includes standby optical transceivers 1-16. Although the schedule management for the standby optical transceivers 1 to 16 is different from that of the second embodiment, the configuration of the optical node of the third embodiment is the same as that of the second embodiment. The configuration will be described with reference to FIG.

  FIG. 17 is a diagram for explaining the operation of the optical node device 200 in the third embodiment. The optical node device 200 uses the aggregation / multicast functions of the matrix switches 902a and 902b as shown in FIG. 17 when performing operation verification of a plurality of standby optical transceivers simultaneously. With the aggregation / multicast function, light of a plurality of wavelengths can be merged by the matrix switch 902b and branched by the matrix switch 902a. The wavelength tunable selection filter 908 transmits only the wavelength that is to be received by the receiver of each standby optical transceiver out of the light branched by the matrix switch 902a.

  For this reason, when performing the operation verification, the set wavelengths of the standby optical transceivers are set so as not to overlap each other, as indicated by λa and λb in FIG. That is, the operation verification control unit 905 sets the transmission / reception wavelengths of the standby optical transceivers that perform the operation verification at the same time to be different from each other.

  The operation verification control unit 905 periodically performs operation verification of the standby optical transceiver. Then, the operation verification control unit 905 performs the operation verification of the eight standby optical transceivers simultaneously in the operation period 1602 in which the operation verification is performed. The operation verification in the third embodiment is performed one by one between the transmitter and the receiver of each standby optical transceiver, as in the second embodiment. When a problem occurs in the operation verification, the failure detection control unit 906 detects a failure location as in the second embodiment. This operation is repeated in all standby optical transceivers. In the third embodiment, the operation verification interval is set to 20 minutes, and the standby period 1603 during which no verification is performed is set to 40 minutes, so that the operation verification of eight standby optical transceivers is performed every hour. .

  In this way, by connecting the transmitters and receivers of the respective standby optical transceivers, and further performing the operation verification of a plurality of standby optical transceivers at once, the evaluation time can be shortened. As a result, the third embodiment can further increase the standby time as compared with the first embodiment. Then, the operation verification control unit during the standby period can suppress power consumption by stopping the operation of the function that is not used. Further, since the standby period can be further extended, the function unit having a longer startup time can be stopped even in the standby optical transceiver, and a higher power saving effect can be obtained.

  It is desirable that the number of standby optical transceivers whose operation is verified simultaneously is 8 or less. The optical node device 200 uses the aggregation / multicast functions of the matrix switches 902a and 902b as shown in FIG. 17 when performing operation verification of a plurality of standby optical transceivers simultaneously. When the number of aggregation / multicast N is increased, the branch loss of the matrix switch 902 becomes −10 log (1 / N) dB per matrix switch. In order to verify the operation between the optical transceivers, it is desirable that the loss between the standby optical transceivers is 20 dB or less. In this case, the loss including the excessive loss of the two matrix switches and the wavelength tunable selection filter needs to be 20 dB or less, and for that purpose, N is preferably 8 or less. However, the effect of the third embodiment is not lost even when the loss of the matrix switch 902 is large.

[Fourth Embodiment]
FIG. 20 is a diagram illustrating a configuration example of the optical node device according to the fourth embodiment of the present invention. The optical node device 900 includes optical splitters 2004, 2007 and 2008, WSS 2006, a wavelength blocker 2005, and an optical transceiver aggregation device 2003. The optical transceiver aggregating apparatus 2003 includes optical transceiver aggregators 2002a and 2002b. Further, an optical transceiver group 2001 composed of a plurality of optical transceivers is connected to the optical transceiver aggregators 2002a and 2002b.

  The optical node device 900 includes an optical splitter 2007 and a WSS 2006 at connection points of the route 1 and the route 2, respectively. The optical splitter 2007 branches light received from a certain route (for example, route 1) to another route (for example, route 2) and the optical transceiver aggregating apparatus 2003 side.

  Here, by setting the WSS 2006 so that each route is directly connected, the optical node device 900 allows the channel that does not perform Add / Drop in the optical node from a route that remains an optical signal to another route. Pass through (light cut-through). The number of optical transceivers included in the optical node device can be suppressed by the optical cut-through function.

  The optical transceiver aggregators 2002a and 2002b are, for example, matrix switches. The optical transceiver aggregator 2002a connects internal paths so that light from the path 1 and the path 2 branched by the optical splitter 2007 is received (dropped) by a predetermined optical transceiver.

  Here, as shown in FIG. 20, the optical splitters 2004 and 2008 are connected to each other on the branch side of the same path by a loopback optical fiber 2009. By connecting in this way, it is possible to configure a path for looping back the light transmitted by the optical transceiver for each path. The loopback path is in the order of an optical transceiver transmitter, an optical transceiver aggregator 2002b, an optical splitter 2004, a loopback optical fiber 2009, an optical splitter 2008, an optical transceiver aggregator 2002a, and an optical transceiver receiver. Here, the wavelength blocker is also provided to prevent the energy of the verification light from leaking to the network side. Further, instead of the optical splitter 2004, an optical switch may be used.

  In the optical node device 900 having such a configuration, a path for operation verification is set so that light transmitted and received by the optical transceiver passes through the optical transceiver aggregators 2002a and 2002b and the optical splitters 2004 and 2008.

  Then, two standby optical transceivers can be selected from the optical transceiver group 2001, and operation verification similar to the procedure described in the first embodiment can be performed using the above-described path for operation verification. If there is an abnormality in the transmission / reception of the optical transceiver, it can be found that there is an abnormality in the standby optical transceiver or the operation verification path. Further, as described in the first embodiment, an operation test is performed with a standby optical transceiver in which an abnormality is found facing a normal standby optical transceiver, so that the failure location is the optical transceiver or otherwise. It is possible to detect whether it is an optical component.

  That is, the optical node device according to the fourth embodiment has the following effects similar to those of the optical node device according to the first embodiment.

  That is, the optical node device according to the fourth embodiment has an effect of realizing a highly reliable optical node device.

  Furthermore, since the optical node device according to the fourth embodiment can detect a faulty optical component or its fault location, it can reduce the operation cost associated with the optical node fault investigation and The use efficiency of the optical node is improved by shortening the replacement and repair time.

  Note that the optical node devices 100 and 200 described in the first to third embodiments may also have the optical cut-through function described in the fourth embodiment. That is, the optical node devices 100 and 200 may also have a configuration in which the optical splitter 2007 and the WSS 2006 arranged at the entrance or the exit of each route illustrated in FIG. 20 are arranged. With this configuration, the optical node devices 100 and 200 also realize the optical cut-through function.

  The first to fourth embodiments have been described above. However, these are merely representative embodiments of the present invention, and combinations of elements shown in each embodiment or configurations similar to the introduced elements are used. To solve the problem.

  For example, the optical transceiver shown in each embodiment may be an optical transponder that is a repeater. There may be two or more loopback optical fibers. Furthermore, the operation verification schedule shown in each embodiment is an example, and other schedules are possible. For example, when a network that requires high reliability in the verification result is constructed, verification may be performed at a higher frequency. Alternatively, it may be a schedule in which operation verification of any one of the standby optical transceivers is always performed.

  In the second and third embodiments, an optical transceiver that may have failed can be identified at the time of operation verification. For this reason, when an abnormality is recognized in the operation verification, it may be determined that the optical transceiver is malfunctioning during the operation test. In this case, since the failure location detecting means can be omitted, the optical node devices of the second and third embodiments have the effect that the control is further simplified and the cost is reduced.

In addition, although embodiment of this application can also be described like the following additional remarks, it is not limited to the following.
[Appendix 1]
At least one first port to which the transmitter is connected;
At least one second port to which the receiver is connected;
At least two third ports, some of which are selectively connected only to the first port and other parts are selectively connected only to the second port;
An optical transmission line connecting the sixth port and the seventh port which are two of the third ports;
With
The fourth port, which is one of the first ports, can be connected to the sixth port, and the fifth port, which is one of the second ports, can be connected to the seventh port. An optical node device.

[Appendix 2]
A first optical transceiver aggregator comprising: the first port; and the third port selectively connected only to the first port; and
A second optical transceiver aggregator comprising: the second port; and the third port selectively connected only to the second port;
An optical node device according to appendix 1, comprising:

[Appendix 3]
The first optical transceiver aggregator includes a first optical wavelength multiple demultiplexer having a multiplexing side port connected to the third port,
The second optical transceiver aggregator includes a second optical wavelength multiple demultiplexer having a multiplexing side port connected to the third port.
The optical node device according to appendix 2.

[Appendix 4]
Selecting the transmitter and the receiver, and connecting the selected transmitter and the receiver to the fourth port and the fifth port, respectively, the transmitter, the receiver, the first The optical node device according to appendix 2 or 3, further comprising an operation verification control unit that performs operation verification of the optical transceiver aggregator and the second optical transceiver aggregator.

[Appendix 5]
A variable wavelength selector capable of setting a transmission wavelength between the fifth port and the receiver;
The first optical transceiver aggregator includes an aggregation function that combines a plurality of lights input to the first port and outputs the combined light to the sixth port;
The second optical transceiver aggregator includes a multicast function for branching light input to the seventh port and outputting the branched light to the second port;
The optical node device according to appendix 3, wherein the first and second optical wavelength multiple polymerization demultiplexers are provided with wavelength recursion.

[Appendix 6]
Selecting the transmitter and the receiver, and connecting the selected transmitter and the receiver to the fourth port and the fifth port, respectively, the transmitter, the receiver, the first Operation verification of the optical transceiver aggregator and the second optical transceiver aggregator is performed, and the transmission wavelength of the variable wavelength selector and the transmission wavelength of the optical transmitter are changed to change the wavelength variable characteristic of the variable wavelength selector. The optical node device according to appendix 5, further comprising an operation verification control unit that verifies the wavelength variable characteristics of the transmitter.

[Appendix 7]
The light output from the third port included in the first optical transceiver aggregator is branched into two or more, the branched light is output to the optical transmission line, and the branched other light is networked An optical splitter that outputs to
Light input from one of the third ports of the second optical transceiver aggregator by combining light transmitted from the network to the optical node and light transmitted through the optical transmission path A coupler;
The optical node device according to appendix 2, further comprising:

[Appendix 8]
The optical node device according to any one of appendices 1 to 7, wherein at least one of the transmitter and the receiver is an optical transceiver having a transmission function and a reception function.

[Appendix 9]
The optical node device according to appendix 4 or 6, wherein the operation verification control unit sequentially performs operation verification on a plurality of the transmitter and the receiver during a predetermined operation verification period.

[Appendix 10]
The optical node device according to appendix 4 or 6, wherein the operation verification control unit performs operation verification on each of the one transmitter and the receiver during a predetermined operation verification period.

[Appendix 11]
At least one of the transmitter and the receiver includes a plurality of standby modes for stopping some functions during standby,
The operation verification control unit performs the operation verification only for the transmitter or the receiver that is waiting in a standby mode that can be activated at a higher speed among the standby modes. An optical node device according to any one of the above.

[Appendix 12]
The optical node device according to any one of appendices 4, 6, 9 to 11, wherein the operation verification control unit performs the operation verification at a predetermined time according to a use situation of a network.

[Appendix 13]
The optical node device according to any one of appendices 4, 6, 9 to 12, wherein the operation verification control unit has a function of verifying a startup time of the optical transceiver.

[Appendix 14]
A failure detection control unit that further performs operation verification between the transmitter or the receiver in which a failure is detected in the operation verification and the transmitter or the receiver in which no failure is detected in the operation verification; An optical node device described in any one of Appendix 4, 6, 9 to 13.

[Appendix 15]
The optical node device according to appendix 4, 6, 9 to 14, wherein the operation verification control unit selects an optical transceiver including the transmitter and the receiver during a predetermined operation verification period and performs the operation verification. .

[Appendix 16]
The first part is selectively connected only to at least one first port to which the transmitter is connected and the other part is selectively connected only to at least one second port to which the receiver is connected. The sixth port and the seventh port, which are two of the three ports, are connected by an optical transmission line;
Connecting the fourth port, which is one of the first ports, and the sixth port;
An optical node device control method for connecting a fifth port, which is one of the second ports, and the seventh port.

  The following two can be considered as examples of utilization of the present invention. One is application to optical nodes in the core and metro area of optical communication networks. The other is application to a large-scale apparatus using an optical transceiver such as a data center or a supercomputer.

100, 200, 800, 900 Optical node device 101, 901, 1801, 1901, 2001 Optical transceiver group 102a, 102b Matrix switch 1801a to 1801g Optical transceiver 104a, 104b, 907a, 907b, 1804, 1902a, 1902b, 2002a, 2002b Optical Transceiver aggregator 103 Wavelength multiple polymerization demultiplexer 109, 904, 2009 Loopback optical fiber 105, 905 Operation verification control unit 106, 906 Failure detection control unit 201, 1002, 1602 Verification period 202, 1003, 1603 Standby period 203, 1001 , 1601 Standby optical transceiver group 301, 303 Start-up time 302, 304 Conduction time 902a, 902b, 1802 Matrix switch 903, 1803 Optical wavelength multiple polymerization demultiplexer 908 Variable wavelength selection filter 1805 Optical fiber group 1903, 2003 Optical transceiver aggregator 1906, 2006 WSS
1907, 2004, 2007, 2008 Optical splitter 2005 Wavelength blocker

Claims (10)

At least one first port to which the transmitter is connected;
At least one second port to which the receiver is connected;
At least two third ports, some of which are selectively connected only to the first port and other parts are selectively connected only to the second port;
An optical transmission line connecting the sixth port and the seventh port which are two of the third ports;
With
The fourth port, which is one of the first ports, can be connected to the sixth port, and the fifth port, which is one of the second ports, can be connected to the seventh port. An optical node device. A first optical transceiver aggregator comprising: the first port; and the third port selectively connected only to the first port; and
A second optical transceiver aggregator comprising: the second port; and the third port selectively connected only to the second port;
The optical node device according to claim 1, comprising: The first optical transceiver aggregator includes a first optical wavelength multiple demultiplexer having a multiplexing side port connected to the third port,
The second optical transceiver aggregator includes a second optical wavelength multiple demultiplexer having a multiplexing side port connected to the third port.
The optical node device according to claim 2. Selecting the transmitter and the receiver, and connecting the selected transmitter and the receiver to the fourth port and the fifth port, respectively, the transmitter, the receiver, the first The optical node device according to claim 2, further comprising an operation verification control unit configured to perform an operation verification of the optical transceiver aggregator and the second optical transceiver aggregator. A variable wavelength selector capable of setting a transmission wavelength between the fifth port and the receiver;
The first optical transceiver aggregator includes an aggregation function that combines a plurality of lights input to the first port and outputs the combined light to the sixth port;
The second optical transceiver aggregator includes a multicast function for branching light input to the seventh port and outputting the branched light to the second port;
4. The optical node device according to claim 3, wherein the first and second optical wavelength multiple polymerization demultiplexers have wavelength recursion. Selecting the transmitter and the receiver, and connecting the selected transmitter and the receiver to the fourth port and the fifth port, respectively, the transmitter, the receiver, the first Operation verification of the optical transceiver aggregator and the second optical transceiver aggregator is performed, and the transmission wavelength of the variable wavelength selector and the transmission wavelength of the optical transmitter are changed to change the wavelength variable characteristic of the variable wavelength selector. The optical node device according to claim 5, further comprising an operation verification control unit that verifies a wavelength variable characteristic of the transmitter. The light output from the third port included in the first optical transceiver aggregator is branched into two or more, the branched light is output to the optical transmission line, and the branched other light is networked An optical splitter that outputs to
Light input from one of the third ports of the second optical transceiver aggregator by combining light transmitted from the network to the optical node and light transmitted through the optical transmission path A coupler;
The optical node device according to claim 2, further comprising: At least one of the transmitter and the receiver includes a plurality of standby modes for stopping some functions during standby,
7. The operation verification control unit according to claim 4, wherein the operation verification control unit performs the operation verification only on the transmitter or the receiver that is waiting in a standby mode that can be activated at a higher speed among the standby modes. Optical node equipment. A failure detection control unit that further performs operation verification between the transmitter or the receiver in which a failure is detected in the operation verification and the transmitter or the receiver in which no failure is detected in the operation verification; An optical node device according to any one of claims 4, 6, and 8. The first part is selectively connected only to at least one first port to which the transmitter is connected and the other part is selectively connected only to at least one second port to which the receiver is connected. The sixth port and the seventh port, which are two of the three ports, are connected by an optical transmission line;
Connecting the fourth port, which is one of the first ports, and the sixth port;
An optical node device control method for connecting a fifth port, which is one of the second ports, and the seventh port.

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