WO2022085147A1 - 光パス設計装置、光パス設計方法及びプログラム - Google Patents

光パス設計装置、光パス設計方法及びプログラム Download PDF

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Publication number
WO2022085147A1
WO2022085147A1 PCT/JP2020/039682 JP2020039682W WO2022085147A1 WO 2022085147 A1 WO2022085147 A1 WO 2022085147A1 JP 2020039682 W JP2020039682 W JP 2020039682W WO 2022085147 A1 WO2022085147 A1 WO 2022085147A1
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WIPO (PCT)
Prior art keywords
time
optical path
design
route
optical
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Ceased
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PCT/JP2020/039682
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English (en)
French (fr)
Japanese (ja)
Inventor
貴章 田中
拓也 大原
史一 犬塚
拓哉 小田
将之 下田
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NTT Inc
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Nippon Telegraph and Telephone Corp
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Priority to US18/029,722 priority Critical patent/US12550037B2/en
Priority to PCT/JP2020/039682 priority patent/WO2022085147A1/ja
Priority to JP2022556323A priority patent/JP7436926B2/ja
Publication of WO2022085147A1 publication Critical patent/WO2022085147A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W40/00—Communication routing or communication path finding
    • H04W40/02—Communication route or path selection, e.g. power-based or shortest path routing
    • H04W40/04—Communication route or path selection, e.g. power-based or shortest path routing based on wireless node resources
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/11—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
    • H04B10/114—Indoor or close-range type systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
    • H04J14/0254—Optical medium access
    • H04J14/0267—Optical signaling or routing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00—Routing or path finding of packets in data switching networks
    • H04L45/02—Topology update or discovery
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00—Routing or path finding of packets in data switching networks
    • H04L45/62—Wavelength based
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0446—Resources in time domain, e.g. slots or frames

Definitions

  • the present invention relates to an optical path design device, an optical path design method, and a program.
  • the control device allocates a new optical path to the increased demand.
  • the optical path assigned in this way is not canceled. For example, when the traffic volume increases in an optical network, the already assigned optical path is maintained without being released, and a new optical path is assigned to the increased traffic volume.
  • Non-Patent Document 1 there is an optical network design technology aimed at dynamically allocating optical paths to changing demand (see Non-Patent Document 1).
  • the control device cancels the allocation of the optical path when the communication ends.
  • FIG. 13 is a diagram showing a configuration example of a conventional optical path design device 100.
  • the optical path design device 100 includes a storage unit 101, a search unit 102, and a design unit 103.
  • the storage unit 101 stores the topology information of the optical network having one or more transmission lines as links and the nodes of a plurality of node devices, and the information of the optical path set in the optical network.
  • the search unit 102 searches for a candidate path of an optical signal transmitted through an optical path in an optical network based on the topology information.
  • the design unit 103 selects an optical path that can be assigned from the optical path candidates based on the optical path (optical signal path and frequency) information set for the communication device (not shown) of the optical network. select. In this way, the optical path design device 100 designs an optical path in an optical network.
  • the control device (not shown) generates a control signal including parameters set in the communication device (for example, node device, transmitter / receiver) of the optical network based on the allocation contents of the optical path.
  • the control device transmits the control signal to the communication device of the optical network.
  • the communication device reflects the parameters for setting the assigned optical path in the operation of the communication device (for example, relaying an optical signal).
  • FIG. 14 is a flowchart showing a conventional design operation example of the optical path design device 100.
  • the design unit 103 selects an assignable frequency for one or more paths searched in the optical network (step S1).
  • the design unit 103 selects a combination (optical path) of the path and the frequency band (step S2).
  • the time required for designing the optical path is very short.
  • the time required for work other than optical path setting (for example, optical path design, optical path test, etc.) is required for optical path setting (reflection of parameters to operation). It is longer than the time it is supposed to be. For this reason, conventional optical networks do not take into account the time required to set the optical path. As described above, in the conventional optical network, there is a problem that the optical path design device cannot design the optical path so as to satisfy the time constraint of the demand for the optical path.
  • an object of the present invention is to provide an optical path design device, an optical path design method, and a program capable of designing an optical path so as to satisfy the time constraint of the demand for the optical path.
  • One aspect of the present invention is based on the topology information, start point information, and end point information of an optical network having one or more transmission lines as links and a plurality of node devices as nodes, from the start point to the optical network.
  • the path includes a search unit that searches for candidates for one or more routes to an end point, and an available time that is a time when a frequency band including one or more frequency slots becomes available for communication.
  • It is an optical path design device including a design unit that selects a path and selects the frequency band of an optical signal transmitted through the optical path in the selected path.
  • One aspect of the present invention is an optical path design method executed by an optical path design device, which is a topology information, start point information, and end point information of an optical network having one or more transmission lines as links and a plurality of node devices as nodes. Based on the information in the above, a candidate for one or more routes from the start point to the end point in the optical network is searched for. A search step and a time derivation step of deriving an available time, which is a time when a frequency band including one or more frequency slots becomes available for communication, for each transmission line or node device included in the path. And, based on the available time derived for each transmission line or the node device, the path is selected from one or more candidates for the path searched, and the optical path in the selected path is selected. It is an optical path design method including a design step of selecting the frequency band of the optical signal transmitted.
  • One aspect of the present invention is a program for operating a computer as the above-mentioned optical path design device.
  • FIG. 1 is a diagram showing a configuration example of the communication system 1a.
  • the communication system 1a includes a plurality of node devices 2, one or more transmission lines 3 (optical fibers) connecting the node devices 2, a control device 4, and an optical path design device 5.
  • the node device 2 is, for example, a wavelength selective switch (WSS).
  • a plurality of node devices 2 (optical nodes) and one or more transmission lines 3 (optical links) form an optical signal path in an optical network.
  • the path can include an optical path for each optical signal with a different frequency band.
  • the optical path through which the optical signal in the predetermined frequency band is transmitted is determined according to the parameters set in each node device 2 by the control device 4.
  • the device 2-D constitutes an optical signal path.
  • the node device 2-A is connected to the first end of the transmission line 3-1.
  • the node device 2-B is connected to the second end of the transmission line 3-1.
  • the node device 2-B is connected to the first end of the transmission line 3-2.
  • the node device 2-C is connected to the second end of the transmission line 3-2.
  • the node device 2-C is connected to the first end of the transmission line 3-3.
  • the node device 2-D is connected to the second end of the transmission line 3-3.
  • each node device 2 relays an optical signal.
  • the starting point of the main signal path in the optical network is, for example, the node device 2-A.
  • the end point of the main signal path in the optical network is, for example, the node device 2-D.
  • the optical path (path and frequency of the optical signal) designed by the optical path design device 5 is set in each node device 2 by the control signal of the control device 4.
  • the control device 4 is an optical network management device. That is, the control device 4 is a device that controls (manages) the communication processing of the plurality of node devices 2.
  • the control device 4 acquires the demand information of the optical path in the optical network from, for example, the node device 2.
  • the control device 4 generates an allocation request signal according to the demand information of the optical path in the optical network.
  • the control device 4 outputs the allocation request signal to the optical path design device 5.
  • the demand information includes information on the client device (not shown) that is the source of the main signal (optical signal), the device of the client device (not shown) that is the source of the main signal, and the traffic amount (frequency) required for communication. Band) information and is included.
  • the demand information may further include information on the communication start time and information on the communication end time.
  • the allocation request signal is a signal that requests the allocation (design) of the optical path in response to the demand for the optical path.
  • the allocation request signal includes information on the route (start point and end point) of the main signal and information on the frequency band (traffic amount) of the main signal.
  • the allocation request signal may further include information on the communication start time and information on the communication end time.
  • the control device 4 acquires the allocation contents from the optical path design device 5 as a response to the allocation request signal.
  • the control device 4 generates parameters (for example, route information, frequency information, communication start time information, communication end time information) based on the allocation contents.
  • the control device 4 sets the parameters in each node device 2 by using the control signal for setting the parameters.
  • the control device 4 may set a parameter to each node device 2 by using a control signal similar to the control signal used when setting the optical path allocation.
  • the control protocol is defined as a unique specification by each vendor, for example.
  • the control protocol may be NETCONF (RFC6241) / RESTCONF (RFC8040) based on the data model defined by YANG (IETF RFC7950).
  • the optical path design device 5 is a device that designs (assigns) an optical path (route, frequency, communication start time, communication end time).
  • the optical path design device 5 communicates with the control device 4, for example, when it becomes necessary to exchange information regarding the design of the optical path.
  • the optical path design device 5 acquires the allocation request signal from the control device 4.
  • the optical path design device 5 generates allocation contents based on the allocation request signal.
  • the optical path design device 5 outputs the allocation contents (selection results of the route, frequency, communication start time, communication end time, etc.) to the control device 4.
  • FIG. 2 is a diagram showing a configuration example of the optical path design device 5.
  • the optical path design device 5 includes a design unit 50, a search unit 51, a storage unit 52, and a time derivation unit 53.
  • the design unit 50 acquires the allocation request signal from the control device 4.
  • the design unit 50 controls the operation of each functional unit of the optical path design device 5 based on the allocation request signal.
  • the design unit 50 generates information on the start point and information on the end point based on the information on the path of the main signal.
  • the information of the start point is the identification information of the start point of the route (node device 2-A).
  • the end point information is identification information of the end point (node device 2-D) of the route.
  • the design unit 50 outputs information on the start point and information on the end point to the search unit 51.
  • the search unit 51 acquires information on the start point and information on the end point from the design unit 50.
  • the search unit 51 acquires the topology information of the optical network from the storage unit 52.
  • the search unit 51 searches for one or more route candidates in the optical network based on the topology information, the start point information, and the end point information of the optical network.
  • the search unit 51 outputs the information of the searched route to the time derivation unit 53.
  • the search unit 51 requests the time derivation unit 53 for the available time information of each transmission line 3.
  • the usable time is the time when the frequency band including one or more frequency slots becomes usable for communication.
  • the usable time may be the time when the frequency band in use is released.
  • the storage unit 52 stores the topology information of the optical network, the device information, and the optical path information.
  • the device information is necessary for the parameter information set in each communication device of the route and the state transition of each communication device of the route (for example, switching from the optical path of the first frequency band to the optical path of the second frequency band). Includes information on the alleged time.
  • each communication device of the route is each node device 2.
  • the optical path information is the information of the optical path already set in the optical network.
  • the optical path information includes information on the path in which the optical path is set, information on the frequency (frequency band) of the optical path, information on the communication start time of the optical path, and information on the communication end time of the optical path. ..
  • the time derivation unit 53 acquires the information of the searched route from the design unit 50.
  • the time derivation unit 53 acquires device information and optical path information from the storage unit 52.
  • the time derivation unit 53 derives the usable time in each transmission path 3 of the searched route based on the device information and the optical path information.
  • FIG. 3 is a diagram showing an example of the usable time of each transmission line 3 of the route.
  • the usable time “t0”, “t1”, or “t2” is defined based on the transmission line 3 and the number of the frequency slot (frequency width) of the optical signal.
  • the available time “t0” represents the current time.
  • the usable time “t1” represents a time after the usable time “t0”.
  • the usable time “t2” represents a time after the usable time "t1".
  • the time derivation unit 53 derives the usable time for each transmission line 3.
  • the time derivation unit 53 may derive the available time for each node device 2.
  • the usable time of the transmission line 3 is the usable time of the first node device 2 connected to the first end of the transmission line 3 and the usable time of the second node device connected to the second end of the transmission line 3. It is determined based on the available time of 2. For example, of the usable time of the first node device 2 connected to the first end of the transmission line 3 and the usable time of the second node device 2 connected to the second end of the transmission line 3. The latest time is the usable time of the transmission line 3.
  • the usable time of the transmission line 3-1 is the usable time of the node device 2-A connected to the first end of the transmission line 3-1 and the usable time of the transmission line 3-1 connected to the second end. It is determined based on the available time of the node device 2-B. For example, for the frequency slot "SL1", the usable time of the transmission line 3-1 is the usable time of the node device 2-A connected to the first end of the transmission line 3-1 and the usable time of the transmission line 3-1. Of the available times of the node device 2-B connected to the second end, the latest time "t0" is the available time of the transmission line 3-1.
  • the time derivation unit 53 derives the available time for each transmission line 3 in the route.
  • the latest usable time is the usable time of the combination of the route and the frequency band.
  • the usable time “t0” of the transmission line 3-1 when the frequency slot “SL3” is assigned, the usable time “t0” of the transmission line 3-1, the usable time “t0” of the transmission line 3-2, and the transmission line 3-3.
  • the latest time “t0” is the usable time of the combination of the path from the transmission line 3-1 to the transmission line 3-3 and the frequency slot "SL3".
  • the usable time “t0” of the transmission line 3-1 when the frequency slot “SL4” is assigned, the usable time “t0” of the transmission line 3-1, the usable time “t0” of the transmission line 3-2, and the transmission line 3-3.
  • the latest time “t1” is the usable time of the combination of the path from the transmission line 3-1 to the transmission line 3-3 and the frequency slot "SL4".
  • the latest time “t1" is from the transmission line 3-1 to the transmission line 3-3. It is the usable time of the combination of the path to and the frequency slots "SL3" and "SL4".
  • the design unit 50 selects the route and the frequency band so that the time from the current time to the available time is the shortest for the route. Communication is performed using a frequency band that includes one or more frequency slots. In FIG. 3, when two frequency slots (frequency bands) are required for the demand information of the allocation request signal, the design unit 50 selects the frequency slots “SL3” and “SL4”. In this case, the earliest time "t1" can be assigned.
  • the design unit 50 selects the frequency slots “SL1”, “SL2”, and “SL3”.
  • the design unit 50 may select the frequency slots "SL2”, “SL3”, and “SL4". In these cases, the earliest time "t2" can be assigned.
  • FIG. 4 is a flowchart showing an operation example of the optical path design device 5.
  • the search unit 51 searches for one or more route candidates in the optical network based on the topology information of the optical network, the information of the start point, and the information of the end point (step S101).
  • the time derivation unit 53 derives the available time of each transmission line 3 of the route for each frequency band (step S102).
  • the design unit 50 selects the combination of the route and the frequency band from the candidates predetermined as the combination of the route and the frequency band based on the available time derived for each frequency band (step S103). ..
  • FIG. 5 is a sequence diagram showing an operation example of the optical path design device 5.
  • the design unit 50 acquires the allocation request signal from the control device 4 (step S201).
  • the design unit 50 requests the search unit 51 to execute the route search (step S202).
  • the search unit 51 acquires topology information from the storage unit 52 (step S203).
  • the search unit 51 searches for a candidate for one or more routes in the optical network (step S204).
  • the search unit 51 transmits the search result of the route to the design unit 50 (step S205).
  • the design unit 50 acquires the search result of the route from the search unit 51 (step S206).
  • the design unit 50 requests the time derivation unit 53 for the available time information of each transmission line 3 of the route (step S207).
  • the time derivation unit 53 acquires device information of each transmission line 3 of the route from the storage unit 52 (step S208).
  • the time derivation unit 53 acquires the optical path information of each transmission line 3 of the path from the storage unit 52 (step S209).
  • the time derivation unit 53 derives the usable time of each transmission line 3 of the route for each frequency band based on the device information and the optical path information (step S210).
  • the time derivation unit 53 transmits the available time information of each transmission line 3 to the design unit 50 (step S211).
  • the design unit 50 acquires the available time information of each transmission line 3 from the time derivation unit 53 (step S212). The design unit 50 selects a route and a frequency band as allocation contents based on the available time information of each transmission line 3 (step S213). The design unit 50 outputs the allocation contents to the control device 4 (step S214).
  • the search unit 51 searches for one or more route candidates from the start point to the end point in the optical network based on the topology information of the optical network, the information of the start point, and the information of the end point.
  • the time derivation unit 53 derives the usable time, which is the time when the frequency band including one or more frequency slots becomes usable for communication, for each transmission line 3 or node device 2 included in the path.
  • the design unit 50 selects a route from one or more route candidates searched based on the available time derived for each transmission line 3 or node device 2.
  • the design unit 50 selects the frequency band of the optical signal transmitted through the optical path in the selected path.
  • optical path This makes it possible to design the optical path to meet the time constraints of the optical path demand. It is possible to design an optical path that takes into account the delay from when the parameters are set until the parameters are reflected in the operation.
  • the second embodiment differs from the first embodiment in that not only the usable time of the node device but also the usable time of the optical transmitter / receiver (optical transponder) is taken into consideration.
  • the differences from the first embodiment will be mainly described.
  • FIG. 6 is a diagram showing a configuration example of the communication system 1b.
  • the communication system 1b includes a plurality of node devices 2, a plurality of transmission lines 3 (optical fibers) connecting the node devices 2, a control device 4, an optical path design device 5, and a plurality of transmitters / receivers 6 (transponders). To prepare for.
  • the transmitter / receiver 6 is connected to the node device 2 of the optical signal path.
  • the transmitter / receiver 6-1 and the transceiver 6-2 are connected to the node device 2-A (starting point of the route).
  • the transmitter / receiver 6-3 and the transmitter / receiver 6-4 are connected to the node device 2-D (end point of the route).
  • an optical path is set between the node device 2-A and the node device 2-D.
  • the design unit 50 selects the route and frequency having the shortest time from the current time to the available time (set time of the optical path) from the combinations (candidates) of the route and frequency. For example, the design unit 50 selects the route and frequency having the best balance between the route and the available time as the allocation contents.
  • the routes and frequencies that give the best balance are, for example, routes and usable times that satisfy predetermined conditions.
  • the predetermined condition is, for example, the condition that the time from the current time to the available time is the shortest.
  • the predetermined condition may be, for example, a condition that the value of the predetermined cost function (index) is equal to or less than the threshold value or is within the predetermined range.
  • a plurality of predetermined conditions may be combined.
  • FIG. 7 is a diagram showing an example of the usable time of each transmission line 3 of the route.
  • the example of available time shown in FIG. 7 is similar to the example of available time shown in FIG.
  • the number of frequency slots required for the optical path newly assigned to the demand is one as an example.
  • the usable time of the frequency slot "SL3" in each transmission line 3 of the path is the current time "t0".
  • FIG. 8 is a diagram showing an example of the usable time of each transmitter / receiver 6.
  • the transmitter / receiver 6-1 is using the frequency slots “SL1” and “SL2” until the usable time “t2”.
  • the transmitter / receiver 6-1 is using the frequency slots "SL3", “SL4", “SL5", and “SL6” until the usable time “t3”. Therefore, it can be used for the transmitter / receiver 6-1 to switch the frequency slot in use from the frequency slot "SL1” or “SL2” to the frequency slots "SL3" "SL4" "SL5" or “SL6".
  • the transmitter / receiver 6-1 needs to wait for the switching to be executed until the time "t3" is reached.
  • the design unit 50 when one frequency slot (frequency band) is required for the demand information of the allocation request signal, the design unit 50 describes the frequency slot “SL3”, the transmitter / receiver 6-2, and the transmitter / receiver 6-3. And select. In this case, the earliest time "t1" can be assigned.
  • FIG. 9 is a flowchart showing an operation example of the optical path design device 5.
  • the search unit 51 searches for a candidate for one or more routes in the optical network (step S301).
  • the time derivation unit 53 derives the available time of each transmission line 3 of the route for each frequency band (step S302).
  • the design unit 50 derives the usable time of each transmitter / receiver 6 connected to the start point and the usable time of each transmitter / receiver 6 connected to the end point for each frequency band (step S303).
  • the combination of the transmitter / receiver 6 with the shortest time from the current time to the available time, the route, and the frequency band is selected (step S304).
  • FIG. 10 is a sequence diagram showing an operation example of the optical path design device 5. Each operation from step S401 to step S412 is the same as each operation from step S201 to step S212 shown in FIG.
  • the design unit 50 requests the time derivation unit 53 for the available time information of each transmitter / receiver 6 (step S413).
  • the time derivation unit 53 acquires the device information of each transmitter / receiver 6 from the storage unit 52 (step S414).
  • the time derivation unit 53 acquires the optical path information of each transmitter / receiver 6 from the storage unit 52 (step S415).
  • the time derivation unit 53 derives the usable time of each transmitter / receiver 6 for each frequency band based on the device information and the optical path information (step S416).
  • the time derivation unit 53 transmits the available time information of each transmitter / receiver 6 to the design unit 50 (step S417).
  • the design unit 50 acquires the usable time information of each transmitter / receiver 6 from the time derivation unit 53 (step S418).
  • the design unit 50 selects a route and a frequency band as allocation contents based on the available time information of each transmission line 3 and the available time information of each transmitter / receiver 6 (step S419).
  • the design unit 50 outputs the allocation contents to the control device 4 (step S420).
  • the time derivation unit 53 can use the usable time of one or more first transmitters / receivers 6 connected to the start point and the usable time of one or more second transmitters / receivers 6 connected to the end point. Derived with the time.
  • the design unit 50 determines the path, the frequency band, and the first one based on the usable time of the first transmitter / receiver 6, the usable time of the second transmitter / receiver 6, and the usable time of each transmission line 3. Select the transmitter / receiver 6 and the second transmitter / receiver 6.
  • the time derivation unit 53 can use the usable time of the first node device 2 connected to the first end of the transmission line 3 and the usable time of the second node device 2 connected to the second end of the transmission line 3. Of the time, the later time may be derived as the usable time of the transmission line 3.
  • the third embodiment is different from the first embodiment and the second embodiment in that the setting deadline of the optical path (time specified as a time constraint) is taken into consideration.
  • the differences between the first embodiment and the second embodiment will be mainly described.
  • FIG. 11 is a flowchart showing an operation example of the optical path design device 5.
  • the design unit 50 selects a combination of the transmitter / receiver 6, the route, and the frequency band at the available time before the time specified by using the allocation request signal as the allocation content (step S504).
  • the specified time is determined, for example, based on the communication start time information included in the allocation request signal. For example, the specified time is a time before the communication start time.
  • the design unit 50 may select a route and a frequency band based on the available time before the designated time. This makes it possible to design the optical path so as to satisfy the time constraint of the demand for the optical path even if it is desired to complete the setting of the optical path by a specified time.
  • the design unit 50 may reuse the set parameters. That is, the design unit 50 determines that the route and frequency band selected based on the first available time for the first communication (demand) are the second communication (demand) after the second available time. ) Is determined whether or not it can be used. Designed if the route and frequency band selected based on the first available time for the first communication is determined to be available for the second communication after the second available time. The unit 50 may use the route and frequency band selected based on the first available time for the second communication after the second available time. This makes it possible to reduce the time required to set the parameters and design the optical path to meet the time constraints of the optical path demand.
  • FIG. 12 is a diagram showing a hardware configuration example of the optical path design device 5 in each embodiment.
  • a part or all of each functional unit of the optical path design device 5 is stored in a memory 502 in which a processor 500 such as a CPU (Central Processing Unit) has a non-volatile recording medium (non-temporary recording medium). It is realized as software by executing the program.
  • the program may be recorded on a computer-readable recording medium.
  • Computer-readable recording media include, for example, flexible disks, optomagnetic disks, portable media such as ROM (ReadOnlyMemory) and CD-ROM (CompactDiscReadOnlyMemory), and storage of hard disks built into computer systems. It is a non-temporary recording medium such as the device 501.
  • each functional part of the optical path design device 5 is, for example, an LSI (Large Scale Integrated circuit), an ASIC (Application Specific Integrated Circuit), a PLD (Programmable Logic Device), or an FPGA (Field Programmable Gate Array). It may be realized by using hardware including an electronic circuit (electronic circuit or circuitry) using the above.
  • the present invention is applicable to an optical network communication system.

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  • Electromagnetism (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)
  • Small-Scale Networks (AREA)
  • Optical Communication System (AREA)
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