Management device, optical node device, optical network system, control method, and control program

Abstract

A management device (10) comprises: a path management unit (11) for managing wavelength resources that can be used in a path of a photonics network comprising a node that performs wavelength conversion through optical-analogue-optical conversion, and managing the usage state of wavelength resources; a wavelength conversion management unit (12) for managing path wavelength conversion information including wavelength conversion at the node constituting the path; and a control unit (13) for controlling wavelength conversion at the node on the basis of the managed wavelength resources and the usage state, and controlling analogue compensation at the node on the basis of managed path wavelength conversion information.

Description

[Technical field]

[0001] The present invention relates to a management device, an optical node device, an optical network system, a control method, and a non-transitory computer-readable medium. [Background technology]

[0002] In recent years, the traffic flowing through networks has been growing rapidly due to the rapid spread of mobile terminals such as smartphones and the advancement of terminals, which allows for large-capacity data communication such as high-definition images. According to a survey, the total download traffic of broadband subscribers in Japan in fiscal year 2020 was about 19 Tbps, and is growing at an annual rate of about 57%, and traffic is expected to continue to increase in the future. In response to this, in the core network that supports large-capacity communication, technologies have been developed to meet the need for large capacity, such as wavelength division multiplexing (WDM), which multiplexes and transmits optical signals of multiple different wavelengths on a single optical fiber, advanced modulation methods such as DP-QPSK (Dual Polarization Differential Quadra-ture Phasa Shift Keying), and 16-QAM (16-Quadrature Amplitude Modulation). Furthermore, with the advancement of 5G services in wireless communication, there is a growing need not only for large capacity but also for low latency networks. In response to these needs, the IOWN (Innovative Optical and Wireless Network) initiative led by NTT in recent years has proposed an all-photonics network that will realize a large-capacity, low-latency network. Unlike networks that involve electrical conversion at related switching nodes, an all-photonics network transmits light as is along all paths. This not only enables high-capacity communication without being restricted by the capacity of electrical switches, but also enables low latency due to the absence of delays associated with electrical conversion.

[0003] However, because the same wavelength cannot be used within an optical fiber, paths of the same wavelength that arrive at a switching node from different routes cannot be accommodated in the same fiber, which makes it difficult to control paths efficiently. To address this issue, a method is used in which wavelength converters are used at the switching node to switch the wavelengths and accommodate them in the same fiber.

[0004] Furthermore, for example, Patent Documents 1 and 2 are known as technologies related to signal quality in optical networks. Patent Document 1 discloses a PDL (Polarization Dependent Loss) compensation technology, and Patent Document 2 discloses a dispersion compensation technology. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2015-186230 A [Patent Document 2] JP 2010-206539 A Summary of the Invention [Problem to be solved by the invention]

[0006] However, previous related technologies have not taken into account the wavelength conversion applied in all-photonics networks, making it difficult to effectively suppress degradation of signal quality along the path.

[0007] In view of such problems, the present disclosure aims to provide a management device, an optical node device, an optical network system, a control method, and a non-transitory computer-readable medium that are capable of effectively suppressing degradation of signal quality. [Means for solving the problem]

[0008] The management device of the present disclosure comprises a path management means for managing wavelength resources available for paths in an all-optical network equipped with optical node devices that perform wavelength conversion by optical-analog-optical conversion and the usage status of the wavelength resources, a wavelength conversion management means for managing wavelength conversion information of paths including wavelength conversion in the optical node devices that constitute the paths, and a control means for controlling wavelength conversion in the optical node devices based on the managed wavelength resources and usage status, and for controlling analog compensation in the optical node devices based on the wavelength conversion information of the managed paths.

[0009] The optical node device of the present disclosure is an optical node device that constitutes an all-optical network, and includes an optical receiving means for receiving an optical signal, a wavelength converting means for wavelength converting the received optical signal by optical-analog-optical conversion, an optical transmitting means for transmitting the wavelength-converted optical signal, and a node control means for controlling the wavelength converting means to perform wavelength conversion and analog compensation in response to notification from a management device that manages the all-optical network.

[0010] The optical network system of the present disclosure comprises an all-optical network equipped with optical node devices that perform wavelength conversion by optical-analog-optical conversion, and a management device that manages the all-optical network, wherein the management device comprises a path management means that manages wavelength resources available for paths in the all-optical network and the usage status of the wavelength resources, a wavelength conversion management means that manages wavelength conversion information of paths including wavelength conversion in the optical node devices that constitute the paths, and a control means that controls wavelength conversion in the optical node devices based on the managed wavelength resources and usage status, and controls analog compensation in the optical node devices based on the wavelength conversion information of the managed paths.

[0011] The control method disclosed herein manages wavelength resources available for paths in an all-optical network equipped with optical node devices that perform wavelength conversion by optical-analog-optical conversion and the usage status of the wavelength resources, manages wavelength conversion information of paths including wavelength conversion in the optical node devices that constitute the paths, controls wavelength conversion in the optical node devices based on the managed wavelength resources and usage status, and controls analog compensation in the optical node devices based on the wavelength conversion information of the managed paths.

[0012] A non-transitory computer-readable medium storing a control program according to the present disclosure is a non-transitory computer-readable medium storing a control program for causing a computer to execute processing to manage wavelength resources available for paths in an all-optical network equipped with optical node devices that perform wavelength conversion by optical-analog-optical conversion and the usage status of the wavelength resources, manage wavelength conversion information of paths including wavelength conversion in the optical node devices that constitute the paths, control wavelength conversion in the optical node devices based on the managed wavelength resources and usage status, and control analog compensation in the optical node devices based on the wavelength conversion information of the managed paths. Effect of the Invention

[0013] According to the present disclosure, it is possible to provide a management device, an optical node device, an optical network system, a control method, and a non-transitory computer-readable medium that are capable of effectively suppressing degradation of signal quality. [Brief description of the drawings]

[0014] [Figure 1] FIG. 1 is a functional block diagram showing the configuration of a wavelength converter according to a study example. [Diagram 2] FIG. 13 is a functional block diagram showing the configuration of another wavelength converter according to the study example. [Diagram 3] FIG. 13 is a functional block diagram showing a specific configuration example of another wavelength converter according to the study example. [Figure 4]FIG. 1 is a diagram showing the configuration of an all-photonics network as an example. [Diagram 5] FIG. 1 is a diagram for explaining issues in the all-photonics network of the study example. [Figure 6] FIG. 2 is a functional block diagram showing a schematic configuration of a management device according to an embodiment. [Figure 7] FIG. 2 is a functional block diagram showing a schematic configuration of a node according to an embodiment. [Figure 8] 1 is a configuration diagram showing a configuration example of an optical network system according to a first embodiment. [Figure 9] 2 is a functional block diagram showing a configuration example of each device in the optical network system according to the first embodiment. FIG. [Figure 10] 4 is a flowchart showing an operation example of the optical network system according to the first embodiment. [Figure 11] FIG. 11 is a functional block diagram showing a configuration example of each device in the optical network system according to the second embodiment. [Figure 12] 13 is a flowchart showing an operation example of the optical network system according to the second embodiment. [Figure 13] 13 is a flowchart showing an operation example of the optical network system according to the third embodiment. [Figure 14] FIG. 11 is a diagram showing the relationship between NF characteristics and wavelength according to the third embodiment. [Figure 15] FIG. 2 is a configuration diagram showing an overview of the hardware of a computer according to an embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] Hereinafter, an embodiment will be described with reference to the drawings. In the drawings, the same elements are denoted by the same reference numerals, and repeated explanations will be omitted as necessary.

[0016] (Considerations leading to the embodiment) As described above, wavelength conversion is performed as necessary by wavelength converters at nodes in an all-photonics network. As wavelength conversion methods, all-optical wavelength conversion using the nonlinearity of light and wavelength conversion using a transponder function have been proposed or are being used. All-optical wavelength conversion has the advantage of having little delay because it converts wavelengths directly from light, but there are problems such as the large optical loss of wavelength conversion devices, which limits the possible transmission distance.

[0017] Fig. 1 shows the functional blocks of a wavelength converter using a transponder function. As shown in Fig. 1, a wavelength converter 900 in the study example includes a receiver 901, a transmitter 902, and a digital signal processor 903. The receiver 901 receives an optical signal of a first wavelength (λ1), and after the digital signal processor 903 returns the signal, the transmitter 902 transmits an optical signal of a second wavelength (λ2). This converts the wavelength of the optical signal from λ1 to λ2. In the wavelength converter 900, a complete waveform shaping type is performed by so-called 3R (Re-amplification, Re-shaping, and Re-timing) regeneration via the digital signal processor 903, so there is no transmission distance limit, but there is a problem of delay occurring in the digital signal processor 903.

[0018] Therefore, we consider a configuration in which an analog electrical signal is returned between a transmitter and a receiver without passing through a digital signal processing unit (hereinafter, wavelength conversion using this configuration will be referred to as OAO (optical-analog-optical) wavelength conversion). The functional blocks of this configuration are shown in Fig. 2. As shown in Fig. 2, another wavelength converter 910 in the considered example includes a receiver 901 and a transmitter 902, like wavelength converter 900, but does not require digital signal processing unit 903. That is, in the other wavelength converter 910, the analog electrical signal output from receiver 901 is returned directly to transmitter 902 without passing through digital signal processing unit 903.

[0019] In this configuration, since no digital signal processing is performed, it is necessary to add another function to compensate for the signal degradation accumulated in the transmission path so far. For example, as shown in Fig. 3, an analog signal processing unit 913 is provided between a coherent receiving front end 911 and a coherent transmitting front end 912 to correct the band.

[0020] In the example of FIG. 3, another wavelength converter 910 includes a coherent receiving front end 911, a coherent transmitting front end 912, and an analog signal processing unit 913. The coherent receiving front end 911 is an optical / electrical converter, which performs coherent detection of an input optical signal (λ1) based on a reference light source (local oscillator (LO) light) and outputs an analog electric signal SA1 generated by the detection. The coherent transmitting front end 912 is an electric / optical converter, which performs coherent modulation of an analog electric signal SA2 obtained by folding back the analog electric signal SA1 based on a transmitting light source and outputs an output optical signal (λ2) generated by the modulation. For example, the wavelength of the output optical signal can be converted from λ1 to λ2 according to the wavelength of the transmitting light source. The analog signal processing unit 913 is an analog circuit that performs analog signal processing on the analog electric signal SA1 to compensate for signal quality and generates an analog electric signal SA2. The analog signal processing is an analog compensation process, which compensates for, for example, band deterioration.

[0021] 3, in order to control the analog compensation process, the wavelength converter 910 may include a front-end signal monitor 914, a rear-end signal monitor 915, and an analog signal processing controller 916. The front-end signal monitor 914 monitors the signal characteristics of the analog electrical signal SA1 before the analog signal processing. The rear-end signal monitor 915 monitors the signal characteristics of the analog electrical signal SA2 after the analog signal processing. The analog signal processing controller 916 controls the operation of the analog signal processing of the analog signal processor 913 based on the monitoring results of the front-end signal monitor 914 or the rear-end signal monitor 915. For example, the controller 916 monitors the band of the analog electrical signal SA1 or the analog electrical signal SA2, and controls the amount of band adjustment in the analog signal processor 913 based on the monitoring results.

[0022] Fig. 4 shows the configuration of an all-photonics network using OAO conversion and nodes in the study example. For simplicity, Fig. 4 shows the network configuration as a single, straight transmission line configuration. That is, as shown in Fig. 4, an all-photonics network 800 in the study example includes multiple nodes 810, and each node 810 is connected via an optical transmission line.

[0023] Each node 810 includes optical amplifiers 811 and 812 that compensate for transmission loss, a route switch 813, and an OAO wavelength converter pool 814 equipped with multiple OAO wavelength converters. Route switch 813 is connected between optical amplifiers 811 and 812, and route switch 813 switches the route of the path to OAO wavelength converter pool 814 as necessary. After a path requiring wavelength conversion is connected to OAO wavelength converter pool 814, the wavelength is converted, for example, from λ1 to λ2, and sent to the optical transmission line.

[0024] However, in existing networks, the network range (for example, within 10 hops) is designed in advance so that arrival is guaranteed regardless of which wavelength is assigned to which path. However, when OAO wavelength conversion is installed in the network, the signal quality changes depending on the location of the wavelength conversion (where it is installed from the sending node to the receiving node), so there is a problem that it is difficult to guarantee arrival. For example, as shown in Fig. 5, when OAO wavelength conversion is performed at node 810A, since it is close to the sending end 820 and the signal degradation is not so advanced, the effect of analog compensation is weak, and the remaining transmission path is long, so there is a possibility that the minimum receiving sensitivity will be lowered on the way. Also, when wavelength conversion is performed at node 810E close to the receiving end 830, arrival to node 810E is guaranteed, but when analog compensation is performed on a signal with a deteriorated and poor S / N ratio, the S / N ratio degradation is promoted and the minimum receiving sensitivity may be lowered.

[0025] In addition, there are devices in the network that have wavelength characteristics, such as optical amplifiers, and for example, the NF (Noise Figure) has poor characteristics on the short wavelength side. Therefore, the characteristics may change depending on the wavelength before and after wavelength conversion during wavelength conversion. For example, when converting from a short wavelength to a short wavelength, the characteristics may be worse than when converting from a long wavelength to a long wavelength.

[0026] As described above, many analog compensation techniques have been disclosed so far, such as an analog PDL compensation technique disclosed in Patent Document 1 and an analog dispersion compensation technique disclosed in Patent Document 2 as related techniques. However, the analog compensation techniques so far have not been designed on the assumption that OAO wavelength conversion will be installed, and it is necessary to separately consider network control that takes into account the location of the wavelength conversion. Therefore, the embodiment has been made in consideration of the above problems.

[0027] Specifically, there are two main problems. The first problem is that it is difficult to guarantee the arrival of a path in an all-photonics network using OAO wavelength conversion. The reason is that the signal quality changes depending on the location of the wavelength conversion (where it is installed from the sending node to the receiving node). The second problem is that it is not possible to uniformize the guarantee of the arrival of a path in an all-photonics network using OAO wavelength conversion. The reason is that there are devices such as optical amplifiers that have wavelength characteristics, and the quality of the path depends on the wavelength before and after the wavelength conversion. Therefore, in the embodiment, a control method in an optical network using analog wavelength conversion is provided, and in particular, a method for ensuring the guarantee of the arrival of a path is provided.

[0028] (Outline of the embodiment) FIG. 6 shows a schematic configuration of a management device according to the embodiment, and FIG. 7 shows a schematic configuration of a node according to the embodiment.

[0029] The nodes 20 are optical node devices that perform wavelength conversion by OAO conversion (optical-analog-optical conversion) and constitute an all-photonics network. The management device 10 manages and controls the all-photonics network including the nodes 20. For example, the management device 10 is an NMS (Network Management System) that manages the network.

[0030] 6, the management device 10 includes a path management unit 11, a wavelength conversion management unit 12, and a control unit 13. The path management unit 11 manages wavelength resources available for paths in the all-photonics network and the usage status of the wavelength resources. The path management unit 11 is, for example, a path database that manages and holds wavelength resources (information) and usage status (information).

[0031] The wavelength conversion manager 12 manages wavelength conversion information of the path including wavelength conversions in the nodes 20 that constitute the path. The wavelength conversion manager 12 is, for example, a wavelength conversion management database that manages and holds the wavelength conversion information of the path.

[0032] The control unit 13 controls wavelength conversion in the node 20 based on the wavelength resources and usage status managed by the path management unit 11, and also controls analog compensation in the node 20 based on wavelength conversion information of the path managed by the wavelength conversion management unit 12. For example, the control unit 13 may notify the node 20 of the wavelength conversion information of the path, so as to control the node 20 to perform analog compensation for all paths that have been wavelength converted in the route prior to the node 20.

[0033] In addition, the control unit 13 may further manage wavelength conversion characteristic information including a transmission distance before wavelength conversion, a transmission distance after wavelength conversion, an estimated signal degradation degree, and analog compensation node identification information. In this case, the control unit 13 may determine candidates for paths for which analog compensation is performed based on the wavelength conversion characteristic information, and control the node 20 to perform analog compensation on the determined paths. Furthermore, the control unit 13 may control to divide the entire wavelength band into a plurality of parts and perform wavelength conversion so as to average the NF (Noise Figure) characteristics.

[0034] 7, the node 20 includes an optical receiving unit 21, a wavelength conversion unit 22, an optical transmitting unit 23, and a node control unit 24. The optical receiving unit 21 receives an optical signal from an optical transmission line. The wavelength conversion unit 22 converts the wavelength of the optical signal received by the optical receiving unit 21 by OAO wavelength conversion. The optical transmitting unit 23 transmits the optical signal wavelength-converted by the wavelength conversion unit 22 to the optical transmission line.

[0035] The node control unit 24 controls the wavelength conversion unit 22 to execute wavelength conversion and analog compensation in response to the notification from the management device 10. For example, the node control unit 24 may monitor all paths that have been wavelength converted in the route prior to the node 20 in response to wavelength conversion information of the path notified from the management device 10, and perform analog compensation based on the monitoring results. Also, the node control unit 24 may perform control to perform analog compensation on the corresponding path based on information of the path to be subjected to analog compensation notified from the management device 10.

[0036] This configuration can effectively suppress the degradation of signal quality of paths in an all-photonics network using OAO wavelength conversion. That is, as a first effect, it is possible to guarantee the arrival of paths by appropriately performing analog compensation at nodes in paths where wavelength conversion has been performed. As a second effect, it is possible to equalize the guarantee of path arrival by performing wavelength conversion so that the NF characteristics are averaged.

[0037] (Embodiment 1) Next, a first embodiment will be described. In this embodiment, an example will be described in which a node monitors all paths that have been wavelength-converted in a route prior to the node, and performs analog compensation.

[0038] <System configuration> First, the configuration of this embodiment will be described with reference to Fig. 8 and Fig. 9. Fig. 8 shows a configuration example of an optical network system according to this embodiment. As shown in Fig. 8, an optical network system 1 according to this embodiment includes an NMS 100 and a plurality of nodes 200. The plurality of nodes 200 are connected to each other via an optical transmission path 300 so as to be capable of optical communication. The plurality of nodes 200 and the NMS 100 are also connected to each other via the optical transmission path 300, for example, but may be connected to each other so as to be capable of communication via any other transmission path.

[0039] The multiple nodes 200 are optical communication devices that perform OAO wavelength conversion. That is, the multiple nodes 200 configure an all-photonics network 2 using OAO wavelength conversion. In the example of FIG. 8, the multiple nodes 200 configure a mesh-shaped network, but a network of other shapes such as a ring shape may also be configured. Furthermore, the multiple nodes 200 configure a path from a transmitting node (transmitting end) to a receiving node (receiving end) according to control from the NMS 100, and transmit data (optical signals) on the route of the path.

[0040] The NMS 100 is a management device that manages and controls the all-photonics network 2 including a plurality of nodes 200. The NMS 100 manages and controls the paths that the nodes 200 configure in the all-photonics network 2. The NMS 100 manages the routes and wavelengths of the paths from the transmitting node to the receiving node, and sets the routes and wavelengths for the nodes 200 on the paths.

[0041] 9 shows an example of the configuration of each device in the optical network system according to the present embodiment. As shown in FIG. 9, the NMS 100 includes a path database (DB) 101, a wavelength conversion management database (DB) 102, and a network control unit 103.

[0042] The path database 101 manages paths through multiple nodes 200 in the all-photonics network 2, and manages and holds wavelength resources (wavelength resource information) available for the paths and the usage status (usage status information) of the wavelength resources. The path database 101 holds the wavelength resources and usage status of each node 200 constituting the path. The wavelength resources (wavelength resource information) indicate all wavelengths available for the path, and the usage status (usage status information) indicates the wavelengths being used for the path.

[0043] The wavelength conversion management database 102 manages and holds wavelength conversions performed by the nodes 200 constituting the path. The wavelength conversion management database 102 holds wavelength conversion information for each node 200 constituting the path. The wavelength conversion information is information capable of identifying wavelength conversions at each node 200 on the route of the path, and may indicate, for example, the presence or absence of wavelength conversion at each node 200, or may indicate the wavelengths before and after conversion at each node.

[0044] The network control unit 103 refers to the path database 101 and the wavelength conversion management database 102, and controls the paths and the nodes 200 that constitute the paths. The network control unit 103 performs wavelength conversion of paths that require wavelength conversion, based on the wavelength resources and usage status in the path database 101. That is, the network control unit 103 instructs each node 200 on the path to perform wavelength conversion of the path as necessary, and stores wavelength conversion information indicating the results of the wavelength conversion in the wavelength conversion management database 102. The network control unit 103 also notifies all nodes 200 of the wavelength conversion information of all paths in the wavelength conversion management database 102.

[0045] The node 200 also includes a transmission loss compensation optical amplifier 201 (201a and 201b), an optical switch (SW) 202, a node loss compensation optical amplifier 203 (203a and 203b), a wavelength switch (WSS: Wavelength Selective Switch) 204 (204a and 204b), a tap coupler 205, an optical path monitor 206, an analog wavelength converter pool 210, and a node controller 207.

[0046] The transmission loss compensation optical amplifier 201 is an optical amplifier that compensates for transmission loss occurring in an optical fiber by amplifying an optical signal. The transmission loss compensation optical amplifier 201a is a receiving amplifier that receives an optical signal. The transmission loss compensation optical amplifier 201a receives an optical signal on a fiber-by-fiber basis from an adjacent node on the transmitting node side via an input optical fiber 300a, and compensates for the transmission loss of the input optical fiber 300a on a fiber-by-fiber basis. The transmission loss compensation optical amplifier 201a outputs the optical signal after transmission loss compensation to the optical switch 202.

[0047] The transmission loss compensation optical amplifier 201b is a transmission amplifier that transmits an optical signal. The transmission loss compensation optical amplifier 201b compensates for the transmission loss of the optical signal from the optical switch 202 on a fiber-by-fiber basis. The transmission loss compensation optical amplifier 201b outputs the optical signal on a fiber-by-fiber basis after the transmission loss compensation to an adjacent node on the receiving node side via an output optical fiber 300b.

[0048] The optical switch 202 is an optical switch capable of switching the path of an optical signal on a wavelength-by-wavelength basis. The optical switch 202 is connected between a receiving-side transmission loss compensation optical amplifier 201a and a transmitting-side transmission loss compensation optical amplifier 201b. The optical switch 202 switches between add / drop of a predetermined optical signal (path) in response to control from a node controller 207. The optical switch 202 performs switching on a fiber-by-fiber optical signal from the transmission loss compensation optical amplifier 201a on a wavelength-by-wavelength basis, and outputs an optical signal of a wavelength to be dropped to a node loss compensation optical amplifier 203a via a wavelength conversion port. The optical switch 202 also receives an optical signal from a node loss compensation optical amplifier 203b via a wavelength conversion port via the analog wavelength converter pool 210, performs switching on the received fiber-by-fiber optical signal on a wavelength-by-wavelength basis, and outputs an optical signal of a wavelength to be added to a transmission loss compensation optical amplifier 201b.

[0049] The node loss compensation optical amplifier 203 is an optical amplifier that compensates for losses occurring at a node by amplifying an optical signal. The node loss compensation optical amplifier 203a on the receiving side (drop side) compensates for losses of optical signals on a fiber-by-fiber basis from a wavelength conversion port of the optical switch 202, and outputs the loss-compensated optical signal to the wavelength switch 204a. The node loss compensation optical amplifier 203b on the transmitting side (add side) compensates for losses of optical signals on a fiber-by-fiber basis from the wavelength switch 204b via the analog wavelength converter pool 210, and outputs the loss-compensated optical signal to the wavelength conversion port of the optical switch 202.

[0050] The wavelength switch 204 is an optical switch capable of switching the path of an optical signal on a wavelength-by-wavelength basis. The wavelength switch 204a on the receiving side separates the optical signal on a fiber-by-fiber basis from the node loss compensation optical amplifier 203a on the wavelength-by-wavelength basis, and outputs the separated optical signals to the OAO wavelength converter 211 in the analog wavelength converter pool 210. The wavelength switch 204b on the transmitting side bundles the optical signals on a wavelength-by-wavelength basis from the OAO wavelength converter 211 in the analog wavelength converter pool 210 on a fiber-by-fiber basis, and outputs the optical signal on a fiber-by-fiber basis to the node loss compensation optical amplifier 203b.

[0051] The tap coupler 205 taps a part or all of the optical signal in units of wavelengths output from the wavelength switch 204a on the receiving side. The optical path monitor 206 monitors the quality of the optical signal tapped by the tap coupler 205. In response to control from the node controller 207, the tap coupler 205 taps a predetermined optical signal, and the optical path monitor 206 monitors the tapped optical signal.

[0052] Analog wavelength converter pool 210 includes a plurality of OAO wavelength converters 211. A plurality of OAO wavelength converters 211 are provided corresponding to the wavelengths of input optical signals and the wavelengths of output optical signals. OAO wavelength converter 211 is a wavelength converter capable of performing OAO wavelength conversion and analog compensation. OAO wavelength converter 211 includes, for example, a coherent receiver front end, a coherent transmitter front end, and an analog signal processor (analog compensator) as shown in FIG. 3, but may have other configurations as long as it is capable of OAO wavelength conversion. OAO wavelength converter 211 performs analog compensation, or wavelength conversion and analog compensation, on the optical signal in units of wavelengths from wavelength switch 204a in response to control from node controller 207, and outputs the optical signal subjected to wavelength conversion or analog compensation to wavelength switch 204b.

[0053] For example, a compensator that performs bandwidth compensation, PDL compensation, dispersion compensation, etc. is installed as an analog compensator in OAO wavelength converter 211. Also, optical path monitor 206 differs depending on the configuration of the analog compensator, and for example, a spectrum analyzer is used when bandwidth compensation is performed, a PDL monitor is used when PDL compensation is performed, and a dispersion monitor is used when dispersion compensation is performed.

[0054] The node controller 207 controls each device in the node 200. The node controller 207 controls the operation of each device according to the control from the NMS 100. When the node controller 207 receives a wavelength conversion instruction from the NMS 100, it controls the optical switch 202 to switch the corresponding wavelength, and controls the OAO wavelength converter 211 to convert the wavelength. Furthermore, when the node controller 207 receives wavelength conversion information of all paths from the NMS 100, it determines the path (wavelength) to be monitored, and controls the analog compensation of the corresponding OAO wavelength converter 211 based on the results of monitoring by the tap coupler 205 and the optical path monitor 206.

[0055] <System Operation> Next, the operation of this embodiment will be described using Fig. 10 while referring to Fig. 8 and Fig. 9. Fig. 10 is a flowchart showing an example of the operation of the optical network system according to this embodiment.

[0056] As shown in FIG. 10, first, the NMS 100 performs wavelength conversion of a path (S101). When a path request is issued, the NMS 100 refers to the path database 101, determines a path that requires wavelength conversion based on wavelength resources and usage status, and notifies the node 200 that performs the wavelength conversion of information on the determined path. For example, information for identifying the path, the wavelength before conversion, the wavelength after conversion, etc. are notified. The node controller 207 of each node 200 controls the optical switch 202 and the OAO wavelength converter 211 to convert the wavelength of the corresponding path based on the information received from the NMS 100. In addition, when each node 200 performs wavelength conversion, the NMS 100 holds, in the wavelength conversion management database 102, wavelength conversion information of the path indicating that each node 200 performed wavelength conversion on the path.

[0057] Next, the NMS 100 notifies the wavelength conversion information of all paths (S102). After completing the wavelength conversion and updating the wavelength conversion management database 102, the NMS 100 refers to the wavelength conversion management database 102 and notifies the node controllers 207 of all nodes 200 of the wavelength conversion information of all paths that have been wavelength converted.

[0058] Next, each node 200 performs path drop setting (S103). When each node 200 receives wavelength conversion information of all paths from the NMS 100, the node controller 207 determines the paths (wavelengths) to be dropped based on the wavelength conversion information of all paths. The paths to be dropped are paths to be monitored (candidates for analog compensation). Specifically, from the wavelength conversion information of the paths, paths that have been wavelength converted by other nodes 200 on the route before the node itself (before the node itself) are extracted, and the optical switch 202 is set to drop all the extracted paths (wavelengths).

[0059] Next, each node 200 connects the wavelength switch 204a to the OAO wavelength converter 211 (S104). In each node 200, the node controller 207 sets the wavelength switch 204a so that the paths (wavelengths) set for drop, i.e., all paths that have been wavelength-converted on the route before the node itself, are connected to the OAO wavelength converter 211 after demultiplexing.

[0060] Next, each node 200 monitors the paths (S105). In each node 200, the optical path monitor 206 connected to the tap coupler 205 monitors the quality of the paths (wavelengths) for which drop has been set, that is, all paths that have been wavelength-converted on the route before the node itself.

[0061] Next, each node 200 performs analog compensation based on the path monitoring results (S106). In each node 200, the node controller 207 determines whether the quality of the monitored path exceeds a predetermined degradation threshold. If there is a path that exceeds the degradation threshold, the OAO wavelength converter 211 to which the corresponding path is connected performs analog compensation (or wavelength conversion and analog compensation). That is, for paths whose quality has deteriorated below a predetermined threshold, the OAO wavelength converter 211 performs analog compensation, and for paths whose quality has not deteriorated below the predetermined threshold, the OAO wavelength converter 211 does not perform analog compensation. The amount of analog compensation may be adjusted according to the amount of degradation of the path quality.

[0062] Next, each node 200 performs the add setting of the path (S107) and completes the operation (setting) (S108). When analog compensation is performed in each node 200 according to the monitoring result, the node controller 207 sets the optical switch 202 and the wavelength switch 204b so that the dropped path (wavelength), i.e., the path on which analog compensation has been performed according to the monitoring result, is added to the original fiber. The same operation is performed in the next node 200.

[0063] As described above, in this embodiment, in an all-photonics network using OAO wavelength conversion, the NMS refers to the path database that manages the wavelength resources and usage status in the NMS, notifies the node of the information on paths that require wavelength conversion, performs wavelength conversion, and stores the data in the wavelength conversion management database. The NMS refers to the wavelength conversion management database and wavelengthThe conversion information is notified to the node controllers of all nodes. Each node drops all wavelength-converted paths on the route before the node itself and monitors the signal quality. Based on the monitor information, each node performs analog compensation (or wavelength conversion and analog compensation) in the OAO wavelength converter for paths that exceed a predetermined degradation threshold. In this way, by monitoring the signal quality of wavelength-converted paths and performing analog compensation according to the degradation status, it is possible to guarantee the arrival of the path.

[0064] (Embodiment 2) Next, a description will be given of embodiment 2. In this embodiment, an example will be described in which the NMS determines a path for performing analog compensation.

[0065] <System configuration> First, the configuration of this embodiment will be described with reference to Fig. 11. Fig. 11 shows an example of the configuration of each device in an optical network system according to this embodiment. Here, only the differences from the configuration in the first embodiment will be described, and the description of the same configuration will be omitted.

[0066] In this embodiment, the signal quality of the path is not monitored in each node 200. For this reason, in the node 200, the tap coupler 205 and the optical path monitor 206 in the first embodiment are omitted.

[0067] Furthermore, the NMS 100 includes a wavelength conversion characteristic database 104 (DB) in addition to the configuration of the first embodiment. The wavelength conversion characteristic database 104 holds wavelength conversion characteristic information indicating the wavelength conversion characteristic of a path. The wavelength conversion characteristic information includes a transmission distance before wavelength conversion (A), a transmission distance after wavelength conversion (B), an estimated signal degradation degree (C), and an analog compensation (band recompensation) node number (D). The wavelength conversion characteristic information preferably includes all of the transmission distance before wavelength conversion (A), the transmission distance after wavelength conversion (B), the estimated signal degradation degree (C), and the analog compensation node number (D), but may include at least any of the information. For example, it may include the estimated signal degradation degree (C) and the analog compensation node number (D).

[0068] The transmission distance (A) before wavelength conversion is the transmission distance (e.g., the number of hops) from the transmitting end to the node that performed the wavelength conversion in the path. The transmission distance (B) after wavelength conversion is the transmission distance from the node that performed the wavelength conversion in the path to the receiving end. The estimated signal degradation degree (C) is the degradation degree of the optical signal estimated in the path. The degradation degree is the degradation degree of the optical signal received at the receiving end with respect to the optical signal transmitted from the transmitting end. For example, the degradation degree can be estimated from the transmission distance (A) before wavelength conversion and the transmission distance (B) after wavelength conversion. The analog compensation node number (D) is the number (identification information) of the node that performs analog compensation in the path. The wavelength conversion characteristic information stored in the wavelength conversion characteristic database 104 may be set based on the wavelength conversion information of the path stored in the wavelength conversion management database 102. In addition, the wavelength conversion characteristic information is map information in which each information is mapped. Specifically, the path route is shown on a network map showing the connection relationships of each node in the network, and for each path, the transmission distance before wavelength conversion (A), the transmission distance after wavelength conversion (B), the estimated degree of signal degradation (C), and the analog compensation node number (D) are shown.

[0069] <System Operation> Next, the operation of this embodiment will be described using Fig. 12 while referring to Fig. 6 and Fig. 11. Fig. 12 is a flowchart showing an example of the operation of the optical network system according to this embodiment.

[0070] 12, first, the NMS 100 performs wavelength conversion of the path (S201). As in the first embodiment, when a path request is issued, the NMS 100 refers to the path database 101 that manages wavelength resources and their usage status, notifies the node 200 of the information of the path that requires wavelength conversion, performs the wavelength conversion, and holds the wavelength conversion information of the path in the wavelength conversion management database 102.

[0071] Next, the NMS 100 creates a wavelength conversion characteristic database 104 (S202). The NMS 100 selects paths that are assumed to be deteriorated in advance by creating the wavelength conversion characteristic database 104. Specifically, the NMS 100 generates map information (wavelength conversion characteristic information) in which the transmission distance before wavelength conversion (A), the transmission distance after wavelength conversion (B), the estimated signal deterioration degree (C), and the analog compensation node number (D) are mapped, and the map information is stored in the wavelength conversion characteristic database 104. For example, for each path, the transmission distance before wavelength conversion (A) and the transmission distance after wavelength conversion (B) are obtained from the wavelength conversion information (route and wavelength conversion node) of the path, and the estimated signal deterioration degree (C) is obtained from the transmission distance before wavelength conversion (A) and the transmission distance after wavelength conversion (B). A node that performs analog compensation is selected from the nodes on the path that can perform analog compensation, and the analog compensation node number (D) is specified. The NMS 100 refers to the wavelength conversion characteristic database 104 and determines candidates for paths that perform analog compensation according to the map information. For example, paths to be subject to analog compensation are determined based on the estimated signal degradation level (C) of the path. As a specific example, if the number of hops to guarantee reachability is 10, and paths 1 (A=1, B=9, C=5, D=8) and 2 (A=7, B=3, C=6, D=9) are path 1 and path 2 (A=7, B=3, C=6, D=9), and C=5 or more is subject to analog compensation, then paths 1 and 2 are determined to be subject to analog compensation.

[0072] Next, the NMS 100 notifies the node 200 performing analog compensation of the wavelength conversion information (wavelength conversion management database 102) of the path determined to be subject to analog compensation and the wavelength conversion characteristic information (wavelength conversion characteristic database 104) of the path. In the above specific example, since the analog compensation node number (D) of path 1 is 8, the information of path 1 is notified to the node 200 with node number 8, and since the analog compensation node number (D) of path 2 is 9, the information of path 2 is notified to the node 200 with node number 9.

[0073] Next, the node 200 that has received the notification sets the path to be dropped (S204). When the node 200 receives information on the path to be subjected to analog compensation from the NMS 100, the node controller 207 sets the optical switch 202 to drop the notified path (wavelength) to be subjected to analog compensation.

[0074] Next, the node 200 connects the wavelength switch 204a to the OAO wavelength converter 211 (S205). In the node 200, the node controller 207 sets the wavelength switch 204a so that the path to be subjected to analog compensation for which a drop has been set is connected to the OAO wavelength converter 211 after demultiplexing.

[0075] Next, the node 200 performs analog compensation for the path (S206). In the node 200, the OAO wavelength converter 211 performs analog compensation (or wavelength conversion and analog compensation) for the path connected to the OAO wavelength converter 211.

[0076] Next, the node 200 performs the add setting of the path (S207) and completes the operation (setting) (S208). When analog compensation is performed on the path to be compensated for in the node 200, the node controller 207 sets the optical switch 202 and the wavelength switch 204b so that the dropped path (wavelength) is added to the original fiber. Note that this operation is performed only by the node 200 that has received the notification from the NMS 100.

[0077] As described above, in this embodiment, as another method of performing analog compensation in an all-photonics network using OAO wavelength conversion, a wavelength conversion characteristics database is created and stored in which the transmission distance before wavelength conversion, the transmission distance after wavelength conversion, the estimated signal degradation level, and the analog compensation node number are mapped, and candidates for paths for which analog compensation is performed are determined according to the map, and analog compensation is performed only on those paths. In this way, by calculating the signal quality of the wavelength-converted path in advance and performing analog compensation according to the degradation status, it is possible to guarantee the arrival of the path.

[0078] (Embodiment 3) Next, a description will be given of embodiment 3. Since the configuration in this embodiment may be either embodiment 1 or embodiment 2, a description of the configuration will be omitted.

[0079] <System Operation> Next, the operation of this embodiment will be described using Figures 13 and 14 while also referring to Figures 8 and 9. Figure 13 is a flowchart showing the operation of the optical network system according to this embodiment.

[0080] 13, first, the NMS 100 performs wavelength conversion of a path taking into consideration wavelength characteristics (S301). When a path request is issued, the NMS 100 refers to a path database 101 that manages wavelength resources and usage status, notifies the node 200 of the path information that requires wavelength conversion, performs wavelength conversion, and holds the wavelength conversion information of the path in a wavelength conversion management database 102.

[0081] At this time, the NMS 100 performs wavelength conversion taking into consideration the wavelength characteristics of devices in the network. For example, the wavelength characteristics are NF characteristics of an optical amplifier mounted on the node 200. The NF characteristics of an optical amplifier are characterized in that the short wavelength side is inferior to the long wavelength side. FIG. 14 is a conceptual diagram showing NF characteristics and an algorithm for wavelength allocation. For example, the entire wavelength band is divided into 10, and wavelength conversion is performed based on the wavelength band so that the NF characteristics are averaged. In one example, the NF characteristics can be averaged by controlling the node 200 to convert wavelength band 1 to wavelength band 10, wavelength band 4 to wavelength band 5, etc. In other words, the wavelengths are converted between wavelength bands in which the amount of decrease (deterioration) relative to the average value and the amount of increase (improvement) relative to the average value are equal (absolute values ​​are equal). Note that the operations from S102 onwards are the same as those in the first embodiment, and therefore will not be described.

[0082] As described above, in this embodiment, wavelength conversion may be performed in consideration of the wavelength characteristics of devices in the network. For example, the entire wavelength band may be divided into multiple bands, and wavelength conversion may be performed so that the NF characteristics are averaged. In this way, by performing wavelength conversion in consideration of characteristics such as NF, the quality of the paths is made uniform, and it is possible to reduce paths that require analog compensation.

[0083] The present disclosure is not limited to the above-described embodiment, and can be modified as appropriate without departing from the spirit and scope of the present disclosure.

[0084] Each configuration in the above-described embodiments may be configured by hardware or software, or both, and may be configured by one piece of hardware or software, or may be configured by multiple pieces of hardware or software. Each device and each function (processing) may be realized by a computer 30 having a processor 31 such as a CPU (Central Processing Unit) and a memory 32 which is a storage device, as shown in Fig. 15. For example, a program for performing the method in the embodiment (management method or control method) may be stored in the memory 32, and each function may be realized by executing the program stored in the memory 32 by the processor 31.

[0085] These programs include instructions (or software codes) that, when loaded into a computer, cause the computer to perform one or more functions described in the embodiments. The programs may be stored in a non-transitory computer-readable medium or a tangible storage medium. By way of example and not limitation, computer-readable media or tangible storage media include random-access memory (RAM), read-only memory (ROM), flash memory, solid-state drive (SSD) or other memory technology, CD-ROM, digital versatile disc (DVD), Blu-ray® disk or other optical disk storage, magnetic cassette, magnetic tape, magnetic disk storage or other magnetic storage device. The programs may be transmitted on a transitory computer-readable medium or a communication medium. By way of example and not limitation, a transitory computer-readable medium or a communication medium includes electrical, optical, acoustic, or other forms of propagated signals.

[0086] Although the present disclosure has been described above with reference to the embodiments, the present disclosure is not limited to the above-mentioned embodiments. Various modifications that can be understood by a person skilled in the art can be made to the configuration and details of the present disclosure within the scope of the present disclosure.

[0087] A part or all of the above-described embodiments can be described as, but is not limited to, the following supplementary notes. (Appendix 1) a path management unit for managing wavelength resources available for paths in an all-optical network having optical node devices that perform wavelength conversion by optical-analog-optical conversion and a usage status of the wavelength resources; a wavelength conversion management unit for managing wavelength conversion information of the path including wavelength conversion in the optical node device that configures the path; A control means for controlling wavelength conversion in the optical node device based on the managed wavelength resources and usage status, and for controlling analog compensation in the optical node device based on wavelength conversion information of the managed path; A management device comprising: (Appendix 2) The control means notifies the optical node device of wavelength conversion information of the path, thereby controlling the optical node device in the path to perform analog compensation for all paths that have been wavelength converted in a route prior to the optical node device. 2. The management device of claim 1. (Appendix 3) a wavelength conversion characteristic management unit for managing wavelength conversion characteristic information indicating the wavelength conversion characteristics of the path; The control means determines candidates for paths for which analog compensation is to be performed based on the wavelength conversion characteristic information, and controls the optical node device to perform analog compensation on the determined paths. 2. The management device of claim 1. (Appendix 4) the wavelength conversion characteristic information includes a transmission distance in the path before wavelength conversion, a transmission distance in the path after wavelength conversion, an estimated signal degradation degree in the path, and identification information of a node that performs analog compensation in the path; 4. The management device according to claim 3. (Appendix 5) The control means divides the entire wavelength band into a plurality of wavelengths, and controls the wavelength conversion so as to average the NF (Noise Figure) characteristics. 5. The management device according to claim 1 . (Appendix 6) An optical node device constituting an all-optical network, An optical receiving means for receiving an optical signal; a wavelength conversion means for converting the wavelength of the received optical signal by optical-analog-optical conversion; an optical transmitting means for transmitting the wavelength-converted optical signal; a node control means for controlling the wavelength conversion means to perform wavelength conversion and analog compensation in response to a notification from a management device that manages the all-optical network; An optical node device comprising: (Appendix 7) a monitor means for monitoring an optical signal input to the wavelength conversion means, the node control means monitors, based on wavelength conversion information of paths notified from the management device, all paths including the node control means and which have been wavelength converted in routes preceding the node control means, and controls to perform analog compensation based on the monitoring results; 7. The optical node device according to claim 6. (Appendix 8) the node control means controls to perform analog compensation on a path whose quality is deteriorated below a predetermined threshold among the monitored paths; 8. The optical node device according to claim 7. (Appendix 9) The node control means controls the corresponding path to perform analog compensation based on information of the path to be subjected to analog compensation notified from the management device. 7. The optical node device according to claim 6. (Appendix 10) An all-optical network including an optical node device that performs wavelength conversion by optical-analog-optical conversion, and a management device that manages the all-optical network, The management device includes: a path management unit for managing wavelength resources available for paths in the all-optical network and a usage status of the wavelength resources; a wavelength conversion management unit for managing wavelength conversion information of the path including wavelength conversion in the optical node device that configures the path; A control means for controlling wavelength conversion in the optical node device based on the managed wavelength resources and usage status, and for controlling analog compensation in the optical node device based on wavelength conversion information of the managed path; An optical network system comprising: (Appendix 11) Manage wavelength resources available for paths in an all-optical network including optical node devices that perform wavelength conversion by optical-analog-optical conversion and the usage status of the wavelength resources; Manage wavelength conversion information of the path including wavelength conversion in the optical node device that configures the path; Controlling wavelength conversion in the optical node device based on the managed wavelength resources and usage status, and controlling analog compensation in the optical node device based on wavelength conversion information of the managed path. Control methods. (Appendix 12) Manage wavelength resources available for paths in an all-optical network including optical node devices that perform wavelength conversion by optical-analog-optical conversion and the usage status of the wavelength resources; Manage wavelength conversion information of the path including wavelength conversion in the optical node device that configures the path; Controlling wavelength conversion in the optical node device based on the managed wavelength resources and usage status, and controlling analog compensation in the optical node device based on wavelength conversion information of the managed path. A non-transitory computer-readable medium on which a control program for causing a computer to execute a process is stored. (Appendix 13) A control method in an all-photonics network using analog wavelength conversion in which an analog signal output of an optical receiver is directly connected to an analog signal input of an optical transmitter to perform wavelength conversion, comprising: The NMS has a path database that manages wavelength resources and their usage status, A wavelength management database for managing wavelength conversion information is provided, A path control system, characterized in that wavelength conversion is performed based on said path database, and analog compensation is performed by referring to said wavelength conversion management database. (Appendix 14) A path control method as described in Appendix 13, characterized in that at a node on a communication path, information on the wavelength conversion management base is referenced, all paths that have been wavelength converted on the path prior to the node itself are monitored, and analog compensation is performed based on the monitoring information. (Appendix 15) The NMS has a wavelength conversion characteristic database that holds a transmission distance before wavelength conversion, a transmission distance after wavelength conversion, an estimated degree of signal degradation, and an analog compensation node number, and refers to the wavelength conversion characteristic database to determine candidates for paths to be subjected to analog compensation, and performs analog compensation only on the paths. The path control method described in Supplementary Note 13 is characterized in that the NMS has a wavelength conversion characteristic database that holds a transmission distance before wavelength conversion, a transmission distance after wavelength conversion, an estimated degree of signal degradation, and an analog compensation node number, and refers to the wavelength conversion characteristic database to determine candidates for paths to be subjected to analog compensation, and performs analog compensation only on the paths. (Appendix 16) 15. A path control method according to any one of claims 13 to 14, characterized in that the entire wavelength band is divided into a plurality of wavelengths, and the wavelength conversion is performed so as to average the NF characteristics. (Appendix 17) A network management system comprising the path control method according to claim 13. (Appendix 18) An optical network device comprising the path control method according to claim 13. (Appendix 19) An optical network control program comprising the path control method according to claim 13. [Explanation of symbols]

[0088] 1. Optical Network Systems 2 All-Photonics Network 10 Management device 11 Path Management Unit 12 Wavelength conversion management section 13 Control section 20 nodes 21 Optical receiving section 22 Wavelength conversion section 23 Optical transmitter 24 Node control section 30 Computers 31 Processors 32 Memory 100 NMS 101 Path Database 102 Wavelength Conversion Management Database 103 Network control section 104 Wavelength Conversion Characteristics Database 200 nodes 201 Transmission loss compensation optical amplifier 202 Optical Switch 203 Node loss compensation optical amplifier 204 Wavelength Switch 205 Tap Coupler 206 Optical Path Monitor 207 Node Controller 210 Analog Wavelength Converter Pool 211 OAO Wavelength Converter 300 Optical Transmission Line 300a, 300b optical fiber

Claims

1. a path management unit for managing wavelength resources available for paths in an all-optical network having optical node devices that perform wavelength conversion by optical-analog-optical conversion and a usage status of the wavelength resources; a wavelength conversion management unit for managing wavelength conversion information of the path including wavelength conversion in the optical node device that configures the path; A control means for controlling wavelength conversion in the optical node device based on the managed wavelength resources and usage status, and for controlling analog compensation in the optical node device based on wavelength conversion information of the managed path; A management device comprising:

2. The control means notifies the optical node device of wavelength conversion information of the path, thereby controlling the optical node device in the path to perform analog compensation for all paths that have been wavelength converted in a route prior to the optical node device. The management device according to claim 1 .

3. a wavelength conversion characteristic management unit for managing wavelength conversion characteristic information indicating the wavelength conversion characteristics of the path; The control means determines candidates for paths for which analog compensation is to be performed based on the wavelength conversion characteristic information, and controls the optical node device to perform analog compensation on the determined paths. The management device according to claim 1 .

4. the wavelength conversion characteristic information includes a transmission distance in the path before wavelength conversion, a transmission distance in the path after wavelength conversion, an estimated signal degradation degree in the path, and identification information of a node that performs analog compensation in the path; The management device according to claim 3 .

5. The control means divides an entire wavelength band into a plurality of wavelength bands, and controls the wavelength conversion so as to average NF (Noise Figure) characteristics. The management device according to claim 1 .

6. An optical node device constituting an all-optical network, An optical receiving means for receiving an optical signal; a wavelength conversion means for converting the wavelength of the received optical signal by optical-analog-optical conversion; an optical transmitting means for transmitting the wavelength-converted optical signal; a node control means for controlling the wavelength conversion means to perform wavelength conversion and analog compensation in response to a notification from a management device that manages the all-optical network; An optical node device comprising:

7. a monitor means for monitoring an optical signal input to the wavelength conversion means, the node control means monitors, based on wavelength conversion information of paths notified from the management device, all paths including the node control means and which have been wavelength converted in routes preceding the node control means, and controls to perform analog compensation based on the monitoring results; The optical node device according to claim 6 .

8. An all-optical network including an optical node device that performs wavelength conversion by optical-analog-optical conversion, and a management device that manages the all-optical network, The management device includes: a path management unit for managing wavelength resources available for paths in the all-optical network and a usage status of the wavelength resources; a wavelength conversion management unit for managing wavelength conversion information of the path including wavelength conversion in the optical node device that configures the path; A control means for controlling wavelength conversion in the optical node device based on the managed wavelength resources and usage status, and for controlling analog compensation in the optical node device based on wavelength conversion information of the managed path; An optical network system comprising:

9. Manage wavelength resources available for paths in an all-optical network including optical node devices that perform wavelength conversion by optical-analog-optical conversion and the usage status of the wavelength resources; Manage wavelength conversion information of the path including wavelength conversion in the optical node device that configures the path; Controlling wavelength conversion in the optical node device based on the managed wavelength resources and usage status, and controlling analog compensation in the optical node device based on wavelength conversion information of the managed path. Control methods.

10. Manage wavelength resources available for paths in an all-optical network including optical node devices that perform wavelength conversion by optical-analog-optical conversion and the usage status of the wavelength resources; Manage wavelength conversion information of the path including wavelength conversion in the optical node device that configures the path; Controlling wavelength conversion in the optical node device based on the managed wavelength resources and usage status, and controlling analog compensation in the optical node device based on wavelength conversion information of the managed path. A control program that causes a computer to execute processing.

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