System and method for managing connection information between optical nodes

Abstract

The purpose of the present disclosure is to enable, in a network made up of optical line switching nodes, managing and confirmation of connection states of each of ports of the optical line switching nodes even in a case in which an optical line is switched.　The present disclosure is a system for managing, in an optical fiber network in which a plurality of optical nodes are connected, connection information among the optical nodes. The system is characterized in that data of a connection state of an internal port of a single optical node and connection time thereof are stored in an in-node connection information managing function unit, data of a connection state with a port of an adjacent optical node is stored in an inter-adjacent-node connection information managing function unit, and data relating to a connection state with the optical node that is adjacent on the optical fiber network, that is stored in an inter-node connection information management function unit from the in-node connection information managing function unit and the inter-adjacent-node connection information managing function unit, is created.

Description

[Technical field]

[0001] The present disclosure relates to a method for managing and checking the connection status between optical line switching nodes, and a system for managing and checking the connection status between optical line switching nodes, mainly in an optical fiber network. [Background technology]

[0002] In optical fiber networks, particularly in access networks that connect communication devices installed in communication buildings with user-side communication terminals, optical line switching, such as connecting optical fiber cores to optional routes or changing routes, is performed at a certain frequency in order to use the facilities efficiently during installation and maintenance. Normally, such work is performed by going to the site and physically switching the connections, but a technology has been proposed that allows switching by remotely operating an optical cross-connect switch (for example, see Non-Patent Document 1).

[0003] In a network consisting of a multistage loop configuration and multiple optical line switching nodes, it is assumed that the ports of the optical line switching nodes are directly connected to each other via optical fibers. The optical line switching nodes are also equipped with optical port monitoring units that are structured to be able to read the strength of the optical signals entering the ports. The optical line switching nodes are also structured to convert optical power supply light into electricity, store it, and use the stored power to drive the optical port monitoring units and optical cross-connect switches.

[0004] Here, in a network composed of the above optical line switching nodes, it is necessary to constantly manage the connection status of each port of the optical line switching node and to check the connection status, but there is no specific method for doing so. In addition, although the optical line switching node is structured to be driven by optical power supply light, it is assumed that there may be cases where the power is not always sufficiently stored, so when managing or checking the connection status, it is desirable to use a method that suppresses the use of an optical port monitoring function unit, etc. [Prior art documents] [Non-patent literature]

[0005] [Non-Patent Document 1] "Study on remote optical path switching nodes for future optical access networks", Tomohiro Kawano, Tatsuya Fujimoto, Kazuhide Nakae, Hiroshi Watanabe, Kazunori Katayama, B-13-16, 2021 IEICE General Conference Summary of the Invention [Problem to be solved by the invention]

[0006] An object of the present disclosure is to enable management and confirmation of the connection status of each port of an optical line switching node in a network made up of optical line switching nodes, even when an optical line is switched. [Means for solving the problem]

[0007] The disclosed system and method include: A system for managing connection information between optical nodes in an optical fiber network to which a plurality of optical nodes are connected, comprising: The connection status data of the ports in a single optical node and the time of connection are stored in an intra-node connection information management function unit; storing data on the connection state of ports between adjacent optical nodes in an adjacent node connection information management function unit; The present invention is characterized in that data regarding the connection status of adjacent optical nodes on the optical fiber network is generated from the intra-node connection information management functional unit and the adjacent node connection information management functional unit, and stored in the inter-node connection information management functional unit. Effect of the Invention

[0008] According to the present disclosure, in a network made up of optical line switching nodes, even when an optical line is switched, it is possible to manage and confirm the connection status of each port of the optical line switching node. [Brief description of the drawings]

[0009] [Figure 1]1 is a diagram showing an example of a network configuration using optical nodes. [Diagram 2] 2 is a diagram illustrating an example of the structure of an optical line switching node. [Diagram 3] 4 is a configuration example of each management function for managing an inter-node connection state. [Figure 4] 13 is an example of information stored in the node intra-connection information management function (in the case of optical node No. 1). [Diagram 5] 13 is an example of information stored in the adjacent node connection information management function (between optical nodes 1 and 2). [Figure 6] 13 is an example of information stored in the inter-node connection information management function. [Figure 7] 13 is an example of stored information of an adjacent node connection information management function (an example of stored information of cable information between nodes). [Figure 8] 13 is an example of information stored in an inter-node connection information management function including cable information. [Figure 9] This is an example of a sequential confirmation system. [Figure 10] This is an example of a bulk confirmation system. [Figure 11] This is an example of a loop utilization confirmation system. [Figure 12] This is an example of a loop utilization confirmation system. [Figure 13] This is an example of a loop utilization confirmation system. [Figure 14] 1 is an example of a flow for checking communication during normal / abnormal conditions. [Figure 15] 1 is an example of a flow for checking communication during normal / abnormal conditions. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, the embodiments of the present disclosure will be described in detail with reference to the drawings. Note that the present disclosure is not limited to the embodiments shown below. These implementation examples are merely illustrative, and the present disclosure can be implemented in various forms with various modifications and improvements based on the knowledge of those skilled in the art. Note that components with the same reference numerals in this specification and drawings are assumed to indicate the same components.

[0011] (System configuration of the present disclosure) Fig. 1 shows an example of a system configuration of the present disclosure. The system of the present disclosure is an optical fiber network in which ports of optical line switching nodes (hereinafter referred to as optical nodes) 91 are directly connected to each other via optical fibers 92. In the present disclosure, as an example of an optical fiber network, an example in which optical nodes 91#0 to 91#3 are connected in a loop is shown. As shown in Fig. 2, the optical nodes 91#1 to 91#3 are provided with an optical port monitoring function unit 11 and are structured so as to be able to read the intensity of optical signals entering from the ports.

[0012] The optical node 91#0 is installed in an environment where power can be supplied, and is equipped with an optical testing device 95 and an optical power meter 85, which will be described later. As shown in Fig. 2, each of the optical nodes 91#1 to 91#3 includes a microprocessor 13 that converts optical power supply light into electricity, stores the electricity, and drives the optical port monitoring function unit 11 and the optical cross-connect switch 12 with the stored electricity.

[0013] (First embodiment) A first embodiment for carrying out the present disclosure will now be described in detail. 3 shows an example of the configuration of each management function that manages the optical node 91 connected to the optical fiber network and the inter-node connection state. The system disclosed herein includes an intra-node connection information management function unit 21, an adjacent node connection information management function unit 22, and an inter-node connection information management function unit 23, which are connected via an optical node 91#0 installed in a communication building and a network 96.

[0014] It is assumed that the arrangement of each optical node 91 on the network is known in advance. For example, in the case of Fig. 3, it is possible to know that optical nodes 91 numbered 0, 1, 2, 3, and 0 are arranged and connected in a loop. Also, the 0th optical node 91#0 may be referred to as optical node number 0, the 1st optical node 91#1 as optical node number 1, the 2nd optical node 91#2 as optical node number 2, and the 3rd optical node 91#3 as optical node number 3.

[0015] The intra-node connection information management function unit 21 stores data on the connection state of ports inside a single optical node and the time when the connection was made. FIG. 4 shows an example of information stored in the intra-node connection information management function 21. For each optical node 91, the intra-node connection information management function unit 21 stores which port numbers are connected to which port numbers by the internal optical cross-connect switch 12 and the time when the connection instruction was given to the optical node 91. For example, the intra-node connection information management function unit 21 stores that in optical node 1, port 1 and port 101 are connected, and the time when they were connected was 22:01:59 on January 1, 2021.

[0016] The adjacent node connection information management function unit 22 stores data on the connection state of ports between adjacent optical nodes 91. Fig. 5 shows an example of information stored in the adjacent node connection information management function unit 23. The adjacent node connection information management function unit 22 stores information on which port numbers are physically connected to which port numbers between adjacent optical nodes 91 by optical cables or the like. For example, the adjacent node connection information management function unit 22 stores that port 101 of optical node 1 and port 1 of node 2 are connected.

[0017] In the case of Fig. 3, the adjacent node connection information management function unit 22 stores adjacent node connection information between optical node No. 0 and optical node No. 1, optical node No. 1 and optical node No. 2, and optical node No. 3 and optical node No. 0. Note that this adjacent node connection information is based on the premise that adjacent optical nodes 91 are fixedly connected via optical cables, and there are no changes to the connection except for manual switching. For this reason, a table is created and stored when adjacent optical nodes 91 are connected.

[0018] The inter-node connection information management function unit 23 stores information regarding the connection status of adjacent optical nodes 91 on the optical fiber network. Fig. 6 shows an example of information stored in the inter-node connection information management function 23. When a plurality of optical nodes are interconnected to form an optical fiber network, the inter-node connection information management function unit 23 stores connection information regarding the connection status of each port of each optical node 91 and information on the time when that connection status was generated. This information is stored in a table created by the intra-node connection information management function unit 21 and the adjacent node connection information management function unit 22. Information regarding the connection information may also be stored in this table when the connection information is confirmed by an optical method or the like described later.

[0019] Second embodiment A second embodiment for carrying out the present disclosure will now be described in detail. In the first embodiment, as shown in Fig. 7, in addition to the connection information between adjacent optical nodes 91, the adjacent node connection information management functional unit 22 also stores information on the cables connected between the optical nodes 91. Also, as shown in Fig. 8, the inter-node connection information management functional unit 23 creates a table from the intra-node connection information management functional unit 21 and the adjacent node connection information management functional unit 22 and stores the stored information in the inter-node connection information management functional unit 23, which includes identification information such as the connection numbers of the cable cores between the optical nodes 91.

[0020] In comparison with the first embodiment, the second embodiment makes it possible to grasp information regarding the core wires between the optical nodes 91 as well.

[0021] (Third embodiment) 9 shows an example of a system configuration of this embodiment. An optical node 91#0 is connected to an optical test device 95 that emits test light through an optical coupler 93 and a fiber selector 94. Hereinafter, a third embodiment for carrying out the present disclosure will be described in detail.

[0022] First, a method will be described for comprehensively checking connection information between optical nodes 91. This is a method for sequentially generating information stored in the intra-node connection information management function unit 21 in the first and second embodiments.

[0023] For example, test light is inserted into port 1 of optical node 0 shown in Fig. 1, and depending on the presence or absence of the test light, optical power is measured by the optical port monitoring function unit 11 of port 1 on the input side of the opposing optical node 1, and further, port numbers 101 to 150, 201 to 220, and 251 to 270 on the output side of optical node 1, and by checking the presence or absence of a change in optical power, communication is confirmed, and the actual connection state at optical node 1 is confirmed. The specific insertion of test light is performed using an optical testing device 95, a fiber selector 94, and an optical coupler 93 as shown in Fig. 9.

[0024] Next, if the output port is a loop (hereinafter referred to as upper loop) to which optical nodes 0 to 3 are connected, which are numbered 101 to 150, then the optical port monitoring functional unit 11 of optical node 2 similarly measures the presence or absence of optical power for all ports, checks connectivity, and checks connection information within optical node 91. This continues up to optical node 3 and even optical node 0, where test light is received for optical nodes 91 connected to the upper loop, the presence or absence of optical power is measured, and connectivity is checked.

[0025] The above communication check is performed on all ports of optical node 0. In the case of Fig. 1, it is ports 1 to 50 and 101 to 150. As a result, by checking communication using test light, the connection state within each optical node 91 as shown in Fig. 4 can be checked, and inter-node connection information as shown in Fig. 6 can be comprehensively checked and stored.

[0026] Secondly, in the first and second embodiments, as shown in FIG. 9, a method will be described in which the cross-connect switches 12 of the optical nodes 91#0 to 91#2 are switched to sequentially connect the routes SR1, SR2, SR3, SR4, and SR5 between the optical nodes 91, and the connection status is checked.

[0027] Step S31: In route SR1, ports are fixedly connected between optical node 0 and optical node 1, so a connectivity check is performed in the optical port monitoring function unit 11 on the route SR1 side of optical node 1. The connectivity check is performed by connecting an optical testing device 95 to an optical port connected to optical route SR1 using an optical coupler 93 and a fiber selector 94, and inserting test light (CW light, etc.) from the optical testing device 95 to the port connected to route SR1. Then, a check is performed based on whether or not a change in optical power occurs in the optical port monitoring function unit 11 of optical node 1 depending on the presence or absence of the test light.

[0028] Step S32: Next, the cross connect switch 12 from optical node 0 to optical node 1 is switched to instruct the connection to be switched to route SR2, and routes SR1, SR2, and SR3 are connected, and the connection information of the two ports of optical node 1 connected to route SR2 is updated in the intra-node connection information management function unit 21.

[0029] Step S33: Next, the optical port monitoring function units 11 of optical nodes 1 and 2 connected to the route SR2 each perform a connectivity check in the same manner as described above.

[0030] Step S34: Next, the cross-connect switch 12 from optical node 0 to optical node 2 is switched to instruct the connection to be switched to route SR4, and routes SR3, SR4, and SR5 are connected, and the connection information of the two ports of optical node 2 connected to route SR4 is updated in the intra-node connection information management function unit 21.

[0031] Step S35: Finally, the optical port monitoring function unit 11 of the optical node No. 2 connected to the route SR5 performs a connectivity check in the same manner as described above. Also, the inter-node connection information management function unit 23 described in the first and second embodiments reflects the connection information check.

[0032] The method of checking the inter-node connections in the third embodiment is a reliable checking method because the connections between the optical nodes 91 are checked one by one.

[0033] (Fourth embodiment) A fourth embodiment for carrying out the present disclosure will now be described in detail. In the first and second embodiments, as shown in FIG. 10, a method will be described in which the cross-connect switch 12 of the optical node 91 is switched to sequentially connect routes SR1, SR2, SR3, SR4, and SR5 between the optical nodes 91, and the connection status is confirmed.

[0034] Step S41: Switch the cross connect switch 12 from optical node 0 to optical node 1, and instruct it to switch the connection to route SR2, connect routes SR1, SR2, and SR3, and update the connection information of the two ports of optical node 1 connected to route SR2 in the node internal connection information management function unit 21.

[0035] Step S42: Next, the cross-connect switch 12 from optical node 0 to optical node 2 is switched to instruct switching of the connection to route SR4, connecting routes SR3, SR4, and SR5, and updating the connection information of the two ports of optical node 2 connected to route SR4 in the node internal connection information management function unit 21.

[0036] Step S43: Finally, the optical port monitoring function unit 11 of the optical node No. 2 connected to the route SR5 performs a connectivity check in the same manner as in the third embodiment. Also, the inter-node connection information management function unit 23 described in the first and second embodiments reflects the connection information check.

[0037] The method of checking the inter-node connection in the fourth embodiment has the advantage that since the communication check is performed only at the end, it does not take much time and consumes little power stored in the optical node 91. However, if the communication check cannot be performed, the part of the error may be isolated.

[0038] Fifth embodiment 11 shows an example of a system configuration of this embodiment. An optical node 91#0 is connected to an optical power meter 85 through an optical coupler 83 and a fiber selector 84. Hereinafter, the fifth embodiment for carrying out the present disclosure will be described in detail. In the first and second embodiments, a method will be described in which the cross-connect switch 12 of the optical node 91 is switched as shown in FIG. 11 to sequentially connect routes SR1, SR2, SR3, SR4, and SR5 between the optical nodes 91 and check the connection state.

[0039] Step S51: Switch the cross connect switch 12 from optical node 0 to optical node 1, and instruct it to switch the connection to route SR2, connect routes SR1, SR2, and SR3, and update the connection information of the two ports of optical node 1 connected to route SR2 in the node internal connection information management function unit 21.

[0040] Step S52: Next, as a route dedicated to the test light, the cross-connect switch 12 from optical node 0 to optical node 3 is switched, and an instruction to switch the connection to test light route TR2 is issued, connecting the test light routes TR1, TR2, and TR3, and updating the connection information of the two ports of optical node 3 connected to the test light route TR2 in the intra-node connection information management function unit 21.

[0041] Step S53: Next, the cross-connect switch 12 from optical node 0 to optical node 2 is switched to instruct the connection switching to the test optical route TR4, and route SR3, test optical route TR4, and test optical route TR3 are connected, and the connection information of the two ports of optical node 2 connected to the test optical route TR4 is updated in the intra-node connection information management function unit 21.

[0042] Step S54: Next, test light (CW light, etc.) is inserted from the optical testing device 95 using the optical coupler 93 and fiber selector 94 to the optical port connected to the test light route TR1. At this time, the optical power meter 85 is connected to the optical port connected to the optical route SR1 using the optical coupler 83 and fiber selector 84. Then, communication is confirmed by checking whether the optical power meter 85 changes depending on the presence or absence of the test light. Note that the optical testing device 95 and the optical power meter 85 may be connected in reverse.

[0043] Step S55: Next, the cross-connect switch 12 from optical node 0 to optical node 2 is switched to instruct switching of the connection to route SR4, connecting routes SR3, SR4, and SR5, and updating the connection information of the two ports of optical node 2 connected to route SR4 in the node internal connection information management function unit 21.

[0044] Step S56: Finally, the optical port monitoring function unit 11 of the optical node No. 2 connected to the route SR5 performs a connectivity check in the same manner as described above. Also, the inter-node connection information management function unit 23 described in the first and second embodiments reflects the connection information check.

[0045] The method of checking inter-node connections in the fifth embodiment is a more detailed checking method than the fourth embodiment, since it checks the connectivity of a part of the route, and since it is possible to check the connection state between optical nodes 91 without using the optical port monitoring function unit 11 of the optical node 91, it is a method that can reduce energy consumption of the optical node 91. It can also be an alternative means when the optical port monitoring function unit 11 of the optical node 91 cannot be used due to a failure or the like.

[0046] Sixth embodiment A sixth embodiment for implementing the present disclosure will now be described in detail. In the first and second embodiments, a method will be described in which the cross-connect switch 12 of the optical node 91 is switched as shown in FIG. 12 to sequentially connect routes SR1, SR2, SR3, and SR4 between the optical nodes 91 and check the connection state.

[0047] Step S61: Switch the cross connect switch 12 from optical node 0 to optical node 1, and instruct it to switch the connection to route SR2, connect routes SR1, SR2, and SR3, and update the connection information of the two ports of optical node 1 connected to route SR2 in the node internal connection information management function unit 21.

[0048] Step S62: Next, as a route dedicated to the test light, the cross-connect switch 12 from optical node 0 to optical node 3 is switched to issue an instruction to switch the connection to test light route TR2, and the test light routes TR1, TR2, and TR3 are connected, and the connection information of the two ports of optical node 3 connected to the test light route TR2 is updated in the intra-node connection information management function unit 21. Note that each test light route uses a port with a specific number, for example, the oldest numbered port.

[0049] Step S63: Next, the cross-connect switch 12 from optical node 0 to optical node 2 is switched to instruct the connection switching to the test optical route TR4, and route SR3, test optical route TR4, and test optical route TR3 are connected, and the connection information of the two ports of optical node 2 connected to the test optical route TR4 is updated in the intra-node connection information management function unit 21.

[0050] Step S64: Next, test light (CW light, etc.) is inserted from the optical testing device 95 using the optical coupler 93 and fiber selector 94 to the optical port connected to the test light route TR1. Then, depending on the presence or absence of the test light, the optical power meter 85 using the optical coupler 83 and fiber selector 84 checks whether a change occurs in the optical power for the optical port connected to the optical route SR1 to check for continuity. Note that the optical testing device 95 and the optical power meter 85 may be connected in reverse.

[0051] Step S65: Next, the cross-connect switch 12 from optical node 0 to optical node 2 is switched to instruct the connection to be switched to route SR4, SR3 and SR4 are connected, and the connection information of the two ports of optical node 2 connected to route SR4 is updated in the intra-node connection information management function unit 21.

[0052] Step S66: Finally, the optical port monitoring function unit 11 of the optical node No. 2 connected to the route SR4 performs a connectivity check in the same manner as described above. Also, the inter-node connection information management function unit 23 described in the first and second embodiments reflects the connection information check.

[0053] The method of checking inter-node connections in the sixth embodiment is a method in which a route and core wire for test light are secured, as compared with the method of checking in the fifth embodiment. The fifth embodiment may not be feasible if, for example, all core wires between optical nodes 91 are in use, but the sixth embodiment is always feasible.

[0054] Seventh embodiment A seventh embodiment for carrying out the present disclosure will now be described in detail. In the first and second embodiments, a method will be described in which the cross-connect switch 12 of the optical node 91 is switched as shown in FIG. 13 to sequentially connect routes SR1, SR2, SR3, SR4, and SR5 between the optical nodes 91, and the connection status is confirmed.

[0055] In this embodiment, a test light route is connected in advance in a loop shape from optical node 0 to 1, 2, 3, and 0 as a route dedicated to the test light. Each test light route uses a port with a specific number, for example, the oldest port number.

[0056] Step S71: Switch the cross-connect switch 12 from optical node 0 to optical node 1 to instruct the connection to be switched to test optical route TR6, connect test optical route TR7, test optical route TR6, and route SR3, and update the connection information of the two ports of optical node 1 connected to test optical route TR6 in the intra-node connection information management function unit 21.

[0057] Step S72: Next, the cross-connect switch 12 from optical node 0 to optical node 2 is switched to instruct the connection switching to the test optical route TR4, and route SR3, test optical route TR4, test optical route TR3, test optical route TR2, and test optical route TR1 are connected, and the connection information of the two ports of optical node 2 connected to the test optical route TR4 is updated in the intra-node connection information management function unit 21.

[0058] Step S73: Next, for the optical port connected to the test optical route TR1, depending on whether or not test light (CW light, etc.) is inserted from the optical testing device 95, a communication check is performed based on whether or not a change occurs in the optical power of the optical power meter 85 for the optical port connected to the test optical route TR7. Note that the optical testing device 95 and the optical power meter 85 may be connected in reverse. Also, the inter-node connection information management function unit 23 described in the first and second embodiments reflects this in the connection information check.

[0059] Step S74: Next, the cross connect switch 12 of optical node 0 to optical node 1 is switched to instruct the connection switching to route SR2, connecting routes SR1, SR2, and SR3, and updating the connection information of the two ports of optical node 1 connected to SR2 in the node internal connection information management function unit 21.

[0060] Step S75: Next, the cross-connect switch 12 from optical node 0 to optical node 2 is switched to instruct the connection to be switched to route SR4, connecting routes SR3, SR4, and SR5, and updating the connection information of the two ports of optical node 2 connected to route SR4 in the intra-node connection information management function unit 21.

[0061] The method of checking inter-node connections in the seventh embodiment can be a means of checking route connectivity without passing through optical node No. 0. In addition, since the port numbers for inputting and outputting test light are fixed, the optical coupler 93 and fiber selector 94 required in the third to sixth embodiments are not required.

[0062] Eighth embodiment An eighth embodiment for carrying out the present disclosure will now be described in detail. In the third embodiment, a flow for determining whether the communication check can be performed normally or ends abnormally is shown in Fig. 14. The procedures described in the third embodiment are performed in order (S11 and S12), and if communication is confirmed in all communication check procedures (S12), the connection status check ends (S14). If the communication check procedure in step S12 cannot be performed normally (S12), it is determined that an abnormality has occurred at that point (S15).

[0063] Ninth embodiment A ninth embodiment for carrying out the present disclosure will now be described in detail. Fig. 15 shows a flow for determining whether the communication check can be performed normally or abnormally terminated in the fourth to seventh embodiments. The procedures described in the fourth to seventh embodiments are performed in sequence (S21 and S22), and when communication is confirmed in all communication check procedures (S22), the connection status check is terminated (normal termination) (S24). If the communication check procedures cannot be performed normally in step S22, the check method of the third embodiment is performed (S23). The procedures described in the third embodiment are performed in sequence (S23), and an abnormality is determined at the point where the communication check procedures could not be performed normally (S25).

[0064] The optical node of the present disclosure can also be realized by a computer and a program, and the program can be recorded on a recording medium or provided via a network. [Industrial Applicability]

[0065] The present disclosure can be applied to the information and communications industry. [Explanation of symbols]

[0066] 11: Optical port monitoring function unit 12: Optical cross-connect switch 13: Microprocessor 21: Node connection information management function unit 22: Adjacent node connection information management function unit 23: Inter-node connection information management function 91: Optical node 92: Optical fiber 83, 93: Optical coupler 84, 94: Fiber selector 85: Optical power meter 95: Optical test equipment 96: Network

Claims

1. A system for managing connection information between optical nodes in an optical fiber network to which a plurality of optical nodes are connected, comprising: by switching optical cross-connects of at least one specific optical node among the plurality of optical nodes, except for the specific optical node, connected to the optical fiber network, to sequentially switch connections between the optical nodes, sequentially passing test light through at least one of the optical nodes whose connections have been switched; By checking the change in optical power caused by the test light, the connection status of the optical node after the connection is switched can be confirmed. storing data on the connection state of the port inside the single optical node after the confirmation and the time of connection in an intra-node connection information management function unit; storing data on the connection state of the ports between the adjacent optical nodes after the confirmation in an adjacent node connection information management function unit; The node connection information management unit and the adjacent node connection information management unit generate data on the connection status of adjacent optical nodes on the optical fiber network, which is stored in an inter-node connection information management unit. system.

2. the adjacent node connection information management function unit further includes a cable information management function for managing core numbers of cables connected between optical nodes; data related to a connection state of adjacent optical nodes, which is stored in the node connection information management unit, is generated from data of the node internal connection information management unit and the adjacent node connection information management unit. The system of claim 1 .

3. the specific optical node is connected to an optical testing device that emits a test light; The optical testing device is characterized in that it has a function of checking the connection state of the optical node by checking whether or not there is a change in optical power due to the test light from the optical testing device using a port monitoring function of at least any optical node other than the specific optical node connected to the optical fiber network.

3. A system according to claim 1 or 2.

4. after switching an optical cross-connect of at least one optical node connected to the optical fiber network, a test light from the optical testing device is passed through at least one of the optical nodes that has been switched; A port monitoring function of the optical node through which the test light from the optical testing device is passed is used to check the change in optical power caused by the test light from the optical testing device, thereby checking the connection state between the optical node and the optical node after switching. The system of claim 3.

5. after switching an optical cross-connect of at least one optical node connected to the optical fiber network, passing a test light from the optical testing device through a route connected by the switching; A change in optical power caused by the test light from the optical testing device is confirmed by using an optical power meter provided in the specific optical node, thereby confirming a connection state between the optical node and the optical node after switching. The system of claim 3.

6. If you cannot confirm the change in optical power due to the test light, A test light is passed through each optical node that has been switched in sequence. A port monitoring function of the optical node through which the test light is passed is used to check the change in optical power caused by the test light, thereby checking the connection state between the optical node and the optical node after switching. The system of claim 1 .

7. The test optical route is formed by using a port having a specific number of the optical node. The system of claim 5.

8. the optical power meter is connected to a specific port of the specific optical node; When checking a change in optical power due to the test light from the optical testing device, a port through which the test light from the optical testing device passes is connected to the specific port. The system of claim 7.

9. the optical testing device is connected to a specific port of the specific optical node; When checking a change in optical power due to the test light from the optical testing device, a port through which the test light from the optical testing device passes is connected to the specific port. The system of claim 7.

10. When the change in optical power caused by the test light cannot be confirmed using the port monitoring function, it is determined that there is an abnormality in the path through which the test light is passed. A system according to any one of claims 3 to 9.

11. A method for managing connection information between optical nodes in an optical fiber network to which a plurality of optical nodes are connected, comprising the steps of: by switching optical cross-connects of at least one specific optical node among the plurality of optical nodes to at least any optical node other than the specific optical node connected to the optical fiber network, sequentially switching connections between the optical nodes, and sequentially passing test light through the optical nodes whose connections have been switched; By checking the change in optical power caused by the test light, the connection status of the optical node after the connection is switched can be confirmed. storing data on the connection state of the ports inside the single optical node after the confirmation and the time of connection in an intra-node connection information management functional unit; storing data on the connection state of the ports between the adjacent optical nodes after the confirmation in an adjacent node connection information management function unit; The node connection information management unit and the adjacent node connection information management unit generate data on the connection status of adjacent optical nodes on the optical fiber network, which is stored in an inter-node connection information management unit. method.

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