WO2004059918A1 - ローカルエリア光ネットワークシステム - Google Patents
ローカルエリア光ネットワークシステム Download PDFInfo
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- WO2004059918A1 WO2004059918A1 PCT/JP2003/016307 JP0316307W WO2004059918A1 WO 2004059918 A1 WO2004059918 A1 WO 2004059918A1 JP 0316307 W JP0316307 W JP 0316307W WO 2004059918 A1 WO2004059918 A1 WO 2004059918A1
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0201—Add-and-drop multiplexing
-
- 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
- H04J14/0241—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths
-
- 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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0278—WDM optical network architectures
- H04J14/0283—WDM ring architectures
Definitions
- the present invention relates to an optical network system, and more particularly to a local optical network system that performs data transfer using wavelength multiplexing.
- the terminal device means a terminal device, such as a personal computer or a telephone, that performs communication using the network.
- the communication capacity of telecommunications will reach its limit, and systems that transfer data by optical communication using optical fibers with a larger communication capacity than telecommunications.
- the system disclosed in Japanese Patent Application Laid-Open No. H05-142283 is connected to a ring-shaped optical fiber and an optical fiber, and is used as an address. It has four optical modules to which different wavelengths are assigned, and performs data transfer between terminal devices connected to the optical modules.
- it is necessary to assign different wavelengths to all the optical modules and when the number of optical modules increases, the number of wavelengths of optical signals used increases, and it becomes difficult to control data transfer.
- the system disclosed in Japanese Patent Application No. 2002-2660791 is A number of sub-networks are configured and controlled by a single controller. According to this, even if the number of optical modules to which different wavelengths are assigned as addresses is large, it is sufficient to add a sub-network, and it is possible to expand the local area optical network system while keeping the number of wavelengths small. it can.
- an optical fiber is connected from the expansion point to the controller every time a subnetwork is added to increase the number of communication targets. It must be routed a considerable distance. Also, as the network scale becomes larger, a controller having a large number of distribution ports is required, resulting in a problem that the equipment cost is increased.
- the main object of the present invention is to reduce the number of wavelengths of optical signals to be used, and to easily and inexpensively communicate network objects without adding optical fibers even in networks such as in large-scale buildings. It is an object of the present invention to provide a local area optical network system that can be added. Disclosure of the invention
- a local area optical network system is a local area optical network system that performs packet communication by wavelength division multiplex transmission, comprising: a first optical fiber arranged in a ring; and the first optical fiber.
- a plurality of sub-controllers connected to the first optical fiber; and a plurality of second lights arranged in a ring and connected to each of the sub-controllers.
- a fiber, and a plurality of first optical modules connected to any one of the second optical fibers and assigned mutually different wavelengths in advance.
- the main controller converts an optical signal input from the first optical fiber into an optical signal having a wavelength corresponding to a destination address included in the optical signal, and outputs the optical signal to the first optical fiber.
- the sub-controller is an optical signal of a different wavelength among the pre-assigned sub-controllers dropped from the optical signal transmitted in the first optical fiber, or the second optical fiber
- the optical signal input from the optical signal is converted into an optical signal having a wavelength corresponding to a destination address included in the optical signal and output to the second optical fiber, or added to the first optical fiber, and added to the first optical fiber.
- the optical module of the present invention drops an optical signal of a pre-assigned wavelength from optical signals transmitted in the second optical fiber, and transmits a new optical signal to the second optical fiber. To Atsudo into play.
- the second optical fiber is hierarchically arranged on the first optical fiber, so that an optical signal having the same wavelength is transmitted between the first optical fiber and the second optical fiber. be able to.
- the number of wavelengths of the optical signal to be used can be reduced.
- the sub-controller is connected to an arbitrary position of the first optical fiber, the second optical fiber can be added from the sub-controller.
- the target can be easily expanded.
- the manufacturing cost can be reduced by standardizing the sub-controller and sharing parts with the main controller having functions similar to those of the sub-controller. As a result, the local area optical network system can be configured at low cost.
- the first optical fiber may be arranged so as to connect a plurality of buildings, and the sub-controller and the second optical fiber may be arranged in each building. According to this, even in the case of a network connecting buildings, it is possible to minimize the addition of optical The communication target of the system can be easily added.
- the first optical fiber is disposed so as to connect between floors of a building, and each floor includes the sub-controller and the second optical fiber.
- the main controller converts an optical signal of a specific wavelength input from outside the local area optical network system into an optical signal of a wavelength corresponding to a destination address included in the optical signal, and And converting the optical signal containing the destination address outside the local area optical network system input from the first optical fiber into the optical signal of the specific wavelength, It is preferable to output outside the network system. According to this, it is possible to connect the local area optical network system to public lines or other networks via the main controller.
- the main controller has a plurality of input ports and a plurality of output ports, and outputs an electric signal input to the input port from the output port corresponding to a destination address included in the electric signal.
- a first electrical switch for outputting, an electrical signal input from the output port, which is connected to the input port and the output port, and connected to the first optical fiber;
- the optical signal is converted to an optical signal having a wavelength V, which is assigned to a port, and is output to the first optical fiber.
- the optical signal input from the first optical fiber is converted to an electric signal, and the input port is And preferably a plurality of first converters for outputting to the first converter.
- communication signals on the first optical fiber are centralized by the main controller for optical signals of a plurality of wavelengths transmitted in the first optical fiber. There is no need to perform complicated optical signal management between elephants.
- the sub-controller has a plurality of input ports and a plurality of output ports, and outputs an electric signal input to the input port from the output port corresponding to a destination address included in the electric signal.
- a second electrical switch connected to the first optical fiber, and drops an optical signal of a pre-assigned wavelength from optical signals of different wavelengths transmitted in the first optical fiber.
- a second optical module for adding an optical signal to the first optical fiber; an output port connected to the input port and the output port, and connected to the second optical module; Is converted into an optical signal having a wavelength assigned in advance and output to the second optical module.
- An external converter that converts the input optical signal into an electrical signal and outputs the electrical signal to the input port; connected to the input port and the output port; connected to the second optical fiber; An electrical signal input from the output port is converted into an optical signal having a wavelength assigned to the output port and output to the second optical fiber, and an optical signal input from the second optical fiber is output. And a plurality of second converters for converting the signal into an electric signal and outputting the signal to the input port. According to this, the optical signals of a plurality of wavelengths transmitted in the second optical fiber are centrally managed by the sub-controller, thereby performing complicated optical signal management between communication targets on the second optical fiber. Eliminates the need.
- the optical signal connected to the first optical fiber an optical signal of a wavelength assigned in advance is dropped from optical signals transmitted in the first optical fiber, and a new optical signal is A third optical module for adding to the first optical fiber, wherein wavelengths of optical signals dropped by the sub-controller and the third optical module are different from each other.
- a communication target can be directly connected to not only the second optical fiber but also the first optical fiber, so that a more flexible optical network can be configured.
- the first optical module has a unique physical address as a destination address
- the sub-controller has a physical address of the first optical module connected to the same second optical fiber.
- Physical address storage means for storing an address, wherein the sub-controller stores the physical address contained in an optical signal dropped from the first optical fiber or included in an optical signal input from the second optical fiber.
- the optical signal be converted into an optical signal having a wavelength corresponding to the physical address and output to the second optical fiber. According to this, since the packet can be transmitted based on the physical address, the bucket can be transmitted accurately to the target first optical module.
- FIG. 1 is a diagram illustrating an example of a system configuration of the local area network system according to the first embodiment.
- FIG. 2 is a block diagram showing an internal configuration of the main controller shown in FIG.
- FIG. 3 is a block diagram showing the internal configuration of the sub-controller shown in FIG.
- FIG. 4 is an operation example of the OADM module shown in FIG.
- FIG. 5 is a block diagram showing the internal configuration of the node shown in FIG.
- FIG. 6 is a flowchart showing the operation when data is transferred from the outside to the terminal device in the local area optical network system shown in FIG. It is.
- FIG. 7 is a flowchart showing an operation when data is transferred from the terminal device to the outside in the local area optical network system shown in FIG.
- FIG. 8 is a flowchart showing an operation when data is transferred from a terminal device to another terminal device in the local area optical network system shown in FIG.
- FIG. 9 is a diagram illustrating an example of a system configuration of a personal digital assistant optical network system according to the second embodiment.
- FIG. 1 is a diagram illustrating an example of a system configuration of the local area network system 1 according to the first embodiment.
- the arrows in the figure indicate the transmission direction of the optical signal.
- the local area optical network system 1 shown in FIG. 1 performs bucket communication, forms a main network 2 connecting buildings 70a to 70d, and has a main controller connected to an external network. 10, an optical fiber 3 that is a first optical fiber that connects the main controller 10 and the building in a loop, and a network configured in each of the buildings 70 a to 70 d.
- a plurality of sub-networks 4 a to 4 d connected on the optical fiber 3 via sub-controllers 30 a to 30 d Have.
- This embodiment is a good example of a group of condominium buildings and housing complexes where a plurality of buildings are gathered in a relatively small area.
- a sub-controller 30a connected to the optical fiber 3 of the main network 2 is arranged. Further, in the building 70a, a subnetwork 4a connected to the optical fiber 3 via the sub-controller 30a is arranged. The sub-network 4a is connected to a sub-controller 30a, an optical fiber 5a as a second optical fiber connected to the sub-controller 30a, and an optical fiber 5a connected to the optical fiber 5a. It is composed of 5a and nodes 60aa and 60ab that relay the connection between various terminals.
- a sub-controller 30b connected to the optical fiber 3 of the main network 2 is arranged. Further, a sub-network 4b connected to the optical fiber 3 via the sub-controller 30b is arranged in the building 7Ob. The sub-network 4b is connected to the sub-controller 3Ob, the optical fiber 5 connected to the sub-controller 30b, and the optical fiber 5b, and relays the connection between the optical fiber 5b and various terminals. Nodes 60 ba and 60 bb.
- a sub-controller 30c connected to the optical fiber 3 of the main network 2 is arranged. Further, in the building 70c, a subnetwork 4c connected to the optical fiber 3 via the sub-controller 30c is arranged. The sub-network 4.c is connected to the sub-controller 30c, the optical fiber 5c connected to the sub-controller 30c, the optical fiber 5c, and the connection between the optical fiber 5c and various terminals. From 60 ca to 60 cc.
- a sub-controller 30d connected to the optical fiber 3 of the main network 2 is arranged in the building 70d.
- a subnet 4 d connected to the optical fiber 3 via the sub-controller 30 d is provided.
- the sub-network 4 d is connected to the sub-controller 30 d, the optical fiber 5 d connected to the sub-controller 30 d, and the optical fiber 5 d, and relays the connection between the optical fiber 5 d and various terminals. Node 6 O da ⁇ 60 dc.
- the local area optical network system 1 has a hierarchical structure in which the main network 2 is the first layer, and the subnetworks 4a to 4d, which are networks in the floor, are the second layer.
- FIG. 2 is a block diagram showing an internal configuration of the main controller 10.
- the main controller 10 is a layer 3 switch (hereinafter referred to as L3 SW) 11 which is an electric switch, and the port 3 of 33 ⁇ ⁇ 11? It has an external converter 12 connected to 0, and a multiplex module (hereinafter referred to as MPX module) 13 connected to ports SP1 to SP8 of L3 SW12.
- L3 SW layer 3 switch
- MPX module multiplex module
- the L3 SW11 is a known switch used in a LAN (Local Area Network) or the like, and is a device that performs a third-level switching of a seven-layer model of OSI (Open Systems Interconnection).
- the 3SW11 outputs data input to each port of the L3SW11 from a port corresponding to the destination address based on the destination address included in the data, and performs switching between sub-networks.
- An IP address that is widely used as a destination address can be considered.
- the subnetwork may be a known concept of classifying IP addresses by masks and performing grouping based on IP address values, or an IP address group specifying a specific IP address value. It may be.
- the switch function of L3SW11 is the IP address of this subnetwork.
- a virtual LAN switching can be applied between virtual LANs.
- a method of routing between subnetworks by a known router instead of the L3SW 11 can be used.
- a second-layer switch can be used.
- a physical address represented by a MAC address is used as the destination address, which is obtained from a communication target connected to the optical fiber 3 by communication means such as a broadcast. All are stored, so that the bucket can be transmitted accurately.
- the external converter 12 converts an optical signal, for example, having a wavelength of 1.3 ( ⁇ ) input from outside the local optical network system 1 into an electric signal, and converts the electric signal to the port S ⁇ 0 of the L 3 SW 11. And converts the electrical signal from the port S ⁇ 0 of the L 3 SWl 1 into an optical signal having a wavelength of 1.3 ( ⁇ ), for example, and outputs the optical signal to the outside.
- the MPX module 13 includes converters 21 to 28 connected to the ports SP 1 to SP 8 of the L 3 SW 11, a multiplexer 14, and a demultiplexer 15, respectively.
- Modifications 21 to 28 convert the electric signals input from the ports SP 1 to SP 8 of the L 3 SW 11 connected to the respective optical signals into the corresponding optical signals of wavelengths ⁇ 0 ⁇ to ⁇ 08 to convert the optical signals.
- the signal is output to the multiplexer 14, and the optical signal having the wavelength ⁇ 0 ⁇ to ⁇ 08 from the demultiplexer 15 is converted into an electric signal, and the electric signal is connected to each port SP 1 of the L 3 SW 11 1 Output to ⁇ S ⁇ 8.
- the wavelengths ⁇ 01 to ⁇ 08 are different from each other.
- the multiplexer 14 having a wavelength in the 1.5 ( ⁇ ) band is a wavelength ⁇ 0 ⁇ to ⁇ 08 from the converters 21 to 28.
- the optical signals are multiplexed and output to the optical fiber 3 of the main network 2.
- the demultiplexer 15 The optical signal from the optical fiber 3 is split into optical signals of wavelengths ⁇ 01 to ⁇ 08 and output to the converters 21 to 28 corresponding to the respective wavelengths.
- the main controller 10 controls the wavelength division multiplex transmission of the main network 2.
- the sub-networks 4a to 4d have the same basic configuration in the optical fiber 3 except that the wavelengths of the optical signals dropped or added are different from each other, so only the sub-network 4c will be described.
- the sub-network 4c is connected to the sub-controller 30c connected to the optical fiber 3 of the main network 2, the optical fiber 5c connected to the sub-controller 30c, and connected to the optical fiber 5c. It has a plurality of nodes 60 ca to 60 cc.
- FIG. 3 is a block diagram showing the internal configuration of the sub-controller 30c.
- the sub-controller 30c includes an electric switch L3SW31c, an external converter 32c connected to the port SP0 of the L3SW31c, and an intermediate optical fiber 3.
- the optical add-drop multiplex (OADM) module 50c which is the second optical module connected to the external module 2c, and the ports SP1 to SP of the L3SW31c It has an MPX module 33c connected to 8.
- OADM optical add-drop multiplex
- L3SW31c is a known switch used in LANs and the like, and is a device that performs third-level switching of the OSI seven-layer model.
- the L3SW210c outputs data input to each port of the L3SW310c from a port corresponding to the destination address based on the destination address included in the data, and outputs data between nodes.
- Switch. An IP address widely used as a destination address can be considered. Also For smaller scales, it is also possible to use a second layer switch. In this case, a physical address represented by a MAC address is used as the destination address.
- the physical address is obtained from a communication target connected to the optical fiber 5c by communication means such as broadcast. All acquired physical addresses are stored.
- the external converter 32c which can transmit packets accurately, converts the optical signal input from the optical fiber 3 of the main network 2 to the electrical signal via the OADM module 50c, and converts the electrical signal to an L signal.
- the MPX module 33c includes converters 41c to 48c connected to the ports SP1 to SP8 of the L3 SW31c, a multiplexer 34c, and a demultiplexer 35c. .
- the converters 41 c to 48 c convert the electric signals input from the ports SP 1 to SP 8 of the L 3 SW 31 c connected thereto into optical signals having wavelengths corresponding to the corresponding wavelengths, respectively. Is output to the multiplexer 34c, and the optical signal of the wavelength ⁇ to ⁇ 8 from the demultiplexer 35c is converted into an electrical signal, and the electrical signal is connected to each of the ports SP 1 of the L 3 SW31 c. Output to ⁇ S ⁇ 8.
- the wavelengths ⁇ to ⁇ 8 are different from each other, and are, for example, wavelengths in the 1.5 ( ⁇ ) band.
- Multiplexer 34 c and outputs the multiplexed optical signal having a wavelength Xu ⁇ Ai 8 from the transducer 41 c ⁇ 48 c to the optical fiber 5 c subnetwork 4 c.
- the demultiplexer 35c demultiplexes the optical signal from the optical fiber 5c into optical signals of wavelengths ⁇ to ⁇ 8 and outputs them to the converters 41c to 48c corresponding to the respective wavelengths.
- OADM module 50c is an example of the operation of the OADM module. 4 As shown in (a), optical signals of wavelengths ⁇ 0 ⁇ to ⁇ 08 transmitted through the optical fiber 3 are determined in advance so as not to overlap with other OADM modules on the optical fiber 3. The optical signal of wavelength ⁇ 03 is dropped and the optical signal of wavelength ⁇ 03 is passed through as it is. Further, OADM Mojiyu Le 50 c, as shown in FIG. 4 (b), Atsudo the optical signal of the wavelength lambda 03 to the optical fiber.
- FIG. 5 is a block diagram showing an internal configuration of the node 60ca.
- the node 60 ca includes an OADM module 61 a ca, which is a first optical module inserted in the middle of the optical fiber 5 c of the sub-network 4 c, and an external converter 6 connected to the OADM module 61 ca. It has 2 ca.
- the OADM module 61 1 ca has wavelengths ⁇ to ⁇ 8 (in the example of FIG. 4, the wavelength ⁇ 0 ⁇ to ⁇ 08 ), the optical signal of wavelength Xu (wavelength ⁇ 03 in the example of FIG. 4), which is determined in advance so as not to overlap with other OADM modules on the same network, is dropped. Optical signals other than wavelength Xu are passed through as they are. Further, as shown in FIG. 4B, the OADM module 61 ca adds an optical signal having the wavelength Xu (the wavelength ⁇ 03 in the example of FIG. 4) to the optical fiber 5c.
- the external converter 62 ca is a converter having an optical / electrical converter and an electrical Z-optical converter, and in this case, transmits and receives an optical signal having a wavelength of wavelength.
- a terminal device such as a computer is connected to 62 ca.
- three nodes are located on the optical cape 5c.
- 60 ca to 60 cc is connected, it is configured separately for each subnetwork, and it is possible to add nodes up to the number of ports of the MPX module of the subcontroller, and to connect One node may be used.
- the sub-network configured as described above can be connected to an arbitrary position on the optical cable 3 of the main network 2 and can be expanded up to the number of ports of the MPX module 13 of the main controller 10.
- a configuration in which one or more nodes are connected to the optical cape 3 of the main network 2 is also possible.
- CWDM Coarse Wavelength-Division Multiplexing
- FIG. 6 is a flowchart showing the operation of the local area optical network system 1.
- FIG. 6 shows a case where data is transferred from the outside in FIG. 1 to a terminal device connected to the node 60 cb of the sub-network 4 c.
- the data transfer from the outside to the terminal device connected to the node other than the node 60 cb is substantially the same.
- An optical signal having a wavelength of, for example, 1.3 ( ⁇ ) from the outside reaches the main controller 10 (step S110).
- the external converter 12 of the main controller 10 converts the optical signal having the wavelength of 1.3 ( ⁇ ) into an electric signal and outputs the electric signal to the port S ⁇ ⁇ ⁇ 0 of the L3SW11 (step S120).
- the electrical signal input to L3SW11 is output from the port corresponding to the destination address, here port S ⁇ ⁇ ⁇ ⁇ 3, based on the destination address included in the signal by the switching function of L3SW11. Then, it is input to the ⁇ ⁇ module 13 (step S130).
- the electric signal input from the L 3 SW 11 to the ⁇ module 13 is converted into an optical signal of the wavelength ⁇ 03 by the converter 23 (step S140).
- the optical signal 3 is output to the multiplexer 14, is multiplexed with the optical signal of another wavelength by the multiplexer 14, and is output to the optical fiber 3 of the main network 2 (step S150).
- the optical signal of wavelength ⁇ 03 input to the optical fiber 3 is transmitted through the optical fiber 3 and passes through the OADM module 50 a of the sub-controller 30 a and the OADM module 50 b of the sub-controller 30 b (step). S160), and further transmitted through the optical fiber 3, dropped by the OADM module 50c of the sub-controller 30c, and reaches the sub-controller 30c of the sub-network 4c (step S170).
- the optical signal arriving at the sub-controller 30c is converted from the optical signal of the wavelength ⁇ 03 into an electric signal by the external converter 32c of the sub-controller 30c, and the port S ⁇ 0 (Step S 18 0).
- the electrical signal input to L3SW31c is output from the port corresponding to the destination address, here port SP2, based on the destination address included in the switching function of L3SW31c.
- Is input to the MPX module 33c (step S190).
- L 3 S electric signals inputted to the MP X module 33 c from W31 c is converted into an optical signal having a wavelength lambda 12 in converter 42 c (Step S 200).
- Optical signal converters 42 and converted in c wavelength lambda 12 is output to the multiplexer 34 c, it is an optical signal multiplexed with the other wavelengths in a total duplexer 34 c, the optical fiber 5 subnetwork 4 c Output to c (step S210).
- Optical signal of the wavelength? It 2 which is entered into the optical fiber 5 c is an optical fiber 5 c to transmit, the node 60 through the O ADM modules 6 lea of ca (step S 220), the further optical fiber 5 Medium
- the signal is transmitted, dropped by the OADM module 61 cb of the node 60 cb, and output to the external converter 62 cb.
- the optical signal output to the external converter 62 cb is converted from the optical signal into an electric signal by the external converter 62 cb and output to the terminal device connected to the node 60 cb (step S 230).
- FIG. 7 is a flowchart showing the operation of the local area optical network system 1.
- FIG. 7 shows a case where data is transferred from the terminal device connected to the node 60 cb of the sub network 4 c in FIG. 1 to outside the local area optical network system 1.
- the data transfer from the terminal device connected to a node other than the node 60 cb of the subnet network 4 c to the outside of the local area optical network system 1 is substantially the same.
- the electric signal from the terminal device connected to the node 60 cb of the subnetwork 4 c of the local area optical network system 1 reaches the node 60 cb (step S 310), and the electric signal reaching the node 60 cb is is input to the exterior conversion unit 62 cb is converted into an optical signal of wavelength? i 2.
- Optical signal having a wavelength lambda 12 which is converted to the outside for conversion portion 62 cb is OADM mode is inputted to the Joule 61 cb, the optical signal of the wavelength ⁇ 2 input to OADM module 61 cb is subnetwork 4 by OADM module 61 cb
- the optical fiber 5c is added to the optical fiber 5c (step S320).
- the optical signal of the wavelength ⁇ 2 added to the optical fiber 5c is transmitted through the optical fiber 5c, and the 61 cc OADM module of 60 cc node is snorted (step S330).
- the module 33c is reached (step S340).
- Optical signal of the wavelength? I 2 having reached the MP X module 33 c is output after being demultiplexed by the demultiplexer 35 c to the converter 42 c, the optical signal of wavelength lambda 12 is converted into an electric signal by transducer 42 c Then, the signal is output to port S ⁇ 2 of L3SW31c (step S350).
- the electrical signal input to the L3SW31c is output from the port corresponding to the destination address, here the port SP0, based on the destination address included in the electrical signal by the switching function of the L3SW31C, and externally. Is output to the converter 32c (step S360).
- the electric signal input from the L 3 SW31 C to the external converter 32 c is converted into an optical signal of wavelength ⁇ 03 by the external converter 32 c (step S 370), and the converted optical signal of wavelength ⁇ 03 is converted.
- the optical signal of wavelength ⁇ 3 input to the OADM module 50c is added to the optical fiber 3 of the main network 2 by the ADM module 50c (step S380).
- the optical signal of wavelength ⁇ 03 added to the optical fiber 3 passes through the optical fiber 3. Transmit and pass through the OADM module 50d of the sub-controller 30d (step S390) and reach the MPX module 13 of the main controller 10 (step S400).
- the optical signal of wavelength ⁇ 03 arriving at the MPX module 13 is split by the splitter 15 and output to the converter 23, and the optical signal of wavelength ⁇ 3 is converted to an electrical signal by the converter 23, Output to port S # 3 of SW11 (step S410).
- the electric signal input to the L3SW11 is output from the port corresponding to the destination address, here the port SPO, based on the destination address included in the electric signal by the switching function of the L3SW11, and used for external use.
- Output to converter 12 step S420).
- the electric signal input from the L 3 SW 11 to the external converter 12 is converted by the external converter 12 into, for example, an optical signal having a wavelength of 1.3 ( ⁇ ) (step S 430) and converted.
- an optical signal having a wavelength of 1.3 ( ⁇ ) is output outside the local area optical network system 1 (step S440).
- FIG. 8 is a flowchart showing the operation of the local area optical network system 1.
- FIG. 8 shows a case where data is transferred from the terminal device connected to the node 60 c b of the sub-network 4 c in FIG. 1 to the terminal device connected to the node 60 d c of the sub-network 4 d.
- the data transfer between the terminal devices connected to the other nodes is also the same.
- the electrical signal from the terminal device connected to the node 60 cb of the sub-network 4 c of the local area optical network system 1 reached b (Step S 5 10), the electrical signals reaching the node 60 cb is converted is input to the exterior conversion unit 62 cb into an optical signal having a wavelength lambda 12.
- Optical signals for external conversion unit 62 wavelength lambda 12 that is converted into cb is input to the OADM mode Jiyunore 61 cb, OADM Mojiyunore 61 optical signal of the wavelength ⁇ 2 entered in cb, subnetwork 4 by OADM module 61 cb
- the optical fiber 5c is added to the optical fiber 5c (step S520).
- Optical signal having a wavelength lambda 12 that is Atsudo to the optical fiber 5 c is an optical fiber 5 c to transmit, the OADM module 61 cc of node 60 cc - (step S 530), the sub-controller 30 c of MP X Reach Modulus 33 c (step S540).
- Optical signal having a wavelength lambda 12 having reached the MPX module 33 c is output after being demultiplexed by the demultiplexer 35 c to the converter 42 c, the optical signal of wavelength lambda 12 is converted into an electric signal by the transducer 42 c
- the signal is output to port S S2 of L3SW31c (step S550).
- the electrical signal input to the L3SW31c is output from the port corresponding to the destination address, here the port SP0, based on the destination address included in the electrical signal by the switching function of the L3SW31c.
- Output to the external converter 32c (step S560).
- L 3 SW31 c power et electric signal inputted to the transducer 32 c for the external is converted into an optical signal having a wavelength lambda 03 an external transducer for 32 c (Step S 570), the converted wavelength lambda 03 of The optical signal is output to the OADM module 0c of the sub controller 30c.
- the optical signal of the wavelength ⁇ 3 input to the OADM module 50c is added to the optical fiber 3 of the main network 2 by the OADM module 50c (step S580).
- the optical signal of wavelength ⁇ 3 added to the optical fiber 3 is transmitted through the optical fiber 3 and passes through the OADM module 50 d of the sub-controller 30 d (step S 590), and the MPX module of the main controller 10 Reach 1 to 3 (Step S600).
- the optical signal of the wavelength ⁇ 03 that has reached the MPX module 13 is split by the splitter 15 and output to the converter 23.
- the optical signal of the wavelength ⁇ 03 is converted into an electrical signal by the converter 23, 3 Output to port S # 3 of SW11 (step S610).
- the electric signal input to the L3SW11 is output from the port corresponding to the destination address, here, the port S ⁇ 4, based on the destination address included in the electric signal by the switching function of the L3SW11.
- Step S620 Electric signal input from the L 3 SW1 1 to MP X module 1 3, Ru is converted into an optical signal having a wavelength lambda 04 in converter 24 (step S 630).
- the optical signal of the wavelength ⁇ 04 converted by the converter 24 is output to the multiplexer 14, combined with the optical signal of another wavelength by the multiplexer 14, and output to the optical fiber 3 of the main network 2 (Step S640).
- the optical signal of wavelength ⁇ ⁇ input to the optical fiber 3 is transmitted through the optical fiber 3 and the OADM module 50a of the sub-controller 30a, the OADM module 50b of the sub-controller 30b, and the sub-controller 30
- the OADM module 50c of step c is collected (step S650), and further transmitted through the optical fiber 3, dropped by the OA DM module 50d of the sub-controller 30d and dropped by the sub-controller 30c of the sub-network 4c. Reach c (step S660).
- the optical signal having reached the sub-controller 30 d is converted into an electric signal from the optical signal of wavelength lambda 04 in Sabuachi port over La 30 d exterior converter 50 d of, L 3 SW31 port d S [rho 0 (Step S670).
- the electrical signal input to L3SW31d is output from the port corresponding to the destination address, here port SP3, based on the destination address included in the switching function of L3SW31d.
- Is input to the MPX module 33d (step S680).
- L 3 S The electric signals inputted to the MPX module 3 3 W 3 1 d is converted into an optical signal of wavelength? I 3 in transducer 4 3 d (Step S 6 9 0).
- Optical signal converter 4 3 converted wavelength d lambda 13 is output to the multiplexer 3 4 d is an optical signal multiplexed with the other wavelengths, power output to the optical fiber 5 d subnetwork 4 d (Step S700).
- the optical signal of wavelength ⁇ 3 input to the optical fiber 5 d is transmitted through the optical fiber 5 d, and the OADM module 6 I da of the node 60 da and the O ADM module 6 1 db of the node 60 db are transmitted.
- the signal passes through the optical fiber 5d (step S710), and is further dropped in the OADM module 61dc of the node 60dc to reach the node 6Ode.
- the optical signal of the wavelength ⁇ 13 arriving at the node 60 dc is output to the external converter 62 dc.
- the optical signal output to the external converter 62 dc is converted from an optical signal to an electric signal and output to the terminal device connected to the node 60 dc (step S720).
- the main network 2 connecting the buildings 70 a to 70 d is connected to the sub-network 4 which is a local area network in each building 70 a to 70 d.
- a to 4 d are hierarchically connected, and the optical fiber 3 used in the main network 2 and the optical fibers 5 a to 5 d used in each sub-network 4 a to 4 d are physically independent. . Therefore, the wavelength of the optical signal can be independently allocated between the main network 2 and each of the sub-networks 4a to 4d, and the number of optical signal wavelengths to be used can be reduced.
- the sub-networks 4a to 4d may be connected to the optical cables 3 near the sub-networks 4a to 4d via the sub-controllers 30a to 30d, respectively.
- the manufacturing cost can be reduced by sharing parts with the main controller that has similar functions to the sub-controller. This makes it possible to configure a local optical network system at low cost.
- a main controller and a sub-controller are provided, there is no need to perform complicated optical signal management between nodes.
- FIG. 9 is a diagram illustrating an example of a system configuration of the local area optical network system 1 according to the second embodiment.
- the arrows in the figure indicate the transmission direction of the optical signal.
- the local area optical network system 1 shown in FIG. 9 performs bucket communication and forms a main network 2 which is a network connecting floors 71 a to 71 d in a building 70, and a public line
- a main controller 10 connected to an external network
- an optical fiber 3 which is a first optical fiber connected to the main controller 10
- an optical fiber 3 via a sub controller 30b, 30c. It has sub-networks 4 b and 4 c connected above, and nodes 60 a and 60 d connected to the optical fiber 3 and relaying the connection between the optical fiber 3 and the terminals 72 a and 72 d. ing.
- the building 70 is composed of floors 7 1a to 7 1d, and floor 7 la In FIG. 1, a main controller 10 connected to the optical fiber 3 of the main network 2 and a node 60a are arranged. Terminal 72a is connected to node 60a.
- a sub-controller 30b connected to the optical fiber 3 of the main network 2 is arranged on the floor 71b. Further, on the floor 7 lb, a sub-network 4 b connected to the optical fiber 3 via a sub-controller 30 b is arranged.
- the sub-network 4 b includes a sub-controller 30 b, an optical fiber 5 b as a second optical fiber connected to the sub-controller 30 b, and an optical fiber 5 b connected to the optical fiber 5 b. It consists of nodes 60 ba to 60 bc that relay the connection with the terminal.
- the sub controller 30c connected to the optical fiber 3 of the main network 2 is arranged on the floor 71c. Further, on the floor 71c, a subnetwork 4c connected to the optical fiber 3 via a subcontroller 30c is arranged.
- the sub-network 4c includes a sub-controller 30c, an optical fiber 5c as a second optical fiber connected to the sub-controller 30c, and an optical fiber 5c connected to the optical fiber 5c. It consists of nodes 60 ca to 60 cc that relay the connection with the terminal.
- a node 60 a connected to the optical fiber 3 of the main network 2 is arranged on the floor 7 Id.
- Terminal 72a is connected to node 60a.
- Node 60a is the main network 2
- An OADM module 61a which is a third optical module inserted in the middle of the optical fiber 3, and an external converter 62a connected to the OADM module 61a.
- the OADM module 61a is previously placed on the optical fiber 3 from among the optical signals of wavelength ⁇ ⁇ 08 that are transmitted through the optical fiber.
- the optical signal of wavelength ⁇ 01 (wavelength ⁇ 03 in the example of Fig. 4) that is determined not to overlap with other OADM modules is dropped, and the optical signal other than wavelength ⁇ is passed through as it is.
- the OA DM module 61a adds an optical signal having a wavelength ⁇ (wavelength ⁇ 3 in the example of FIG. 4) to an optical fiber.
- the external transformer 62a is a transformer having an optical-electrical converter and an electric / optical converter, and is connected to a terminal device such as a computer.
- two nodes 60a and 60d are connected to the optical cape node 3, but it is also possible to add nodes up to the number of ports of the MPX module of the sub controller. However, there may be no connected nodes.
- the local area optical network system 1 is composed of a main network 2 which is a network connecting floors 71 a to 71 d in a building 70, and a sub-network which is a network configured for each floor in the first hierarchy. It has a hierarchical structure with Network 4 as the second layer.
- the main network 2 which is a network connecting the floors 71a to 71d in the building 70, is connected to the networks in the floors 71b and 71c.
- the optical fiber 3 used in the main network 2 and the optical fibers 5 b, 5 used in each of the sub-networks 4 b, 4 c c is physically independent. Because of this, the main The wavelength of the optical signal can be independently allocated between the network 2 and each of the sub-networks 4b and 4c, and the number of optical signal wavelengths to be used can be reduced.
- the sub-networks 4b, 4c may be connected to the optical cables 3 near the sub-networks 4b, 4c via the sub-controllers 30b, 30c, respectively.
- the manufacturing cost can be reduced by standardizing the sub-controller and sharing parts with the main controller having functions similar to those of the sub-controller. This makes it possible to configure the local area optical network system at low cost.
- an OADM module is used as an optical module.
- an optical signal that drops an optical signal from an optical fiber to all or a part of the optical module is used. It may be configured to use a drop module.
- an optical module for adding an optical signal to an optical fiber may be used for all or a part of the optical module. Further, the configuration may be such that all of the OADM module, the optical drop module, and the optical module are included.
- the OADM module is provided with the optical signal Z electric signal and the electric signal / optical signal converter to be electrically connected to the communication terminal. May be directly connected by an optical fiber.
- optical network system described above and the controller used therefor can be applied to a system having a large amount of transfer data such as a moving image.
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Abstract
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AU2003292573A AU2003292573A1 (en) | 2002-12-26 | 2003-12-19 | Local area optical network system |
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JP2002377789A JP2004208215A (ja) | 2002-12-26 | 2002-12-26 | ローカルエリア光ネットワークシステム |
JP2002-377789 | 2002-12-26 |
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JP (1) | JP2004208215A (ja) |
AU (1) | AU2003292573A1 (ja) |
TW (1) | TW200421781A (ja) |
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US7599397B2 (en) * | 2005-12-27 | 2009-10-06 | International Business Machines Corporation | Obtaining multiple port addresses by a fibre channel switch from a network fabric |
JPWO2012014444A1 (ja) * | 2010-07-29 | 2013-09-12 | 日本電気株式会社 | 光ネットワークにおける光通信処理装置およびその波長変換方法 |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2000224145A (ja) * | 1999-02-01 | 2000-08-11 | Hitachi Ltd | 光伝送装置および光伝送方法 |
JP2001230794A (ja) * | 1999-12-06 | 2001-08-24 | Kvh Telecom Co Ltd | リング型ネットワークを用いた通信システム及び方法 |
JP2001244954A (ja) * | 2000-02-25 | 2001-09-07 | Nec Corp | 超高速ネットワーク構築方式 |
JP2001313660A (ja) * | 2000-02-21 | 2001-11-09 | Nippon Telegr & Teleph Corp <Ntt> | 波長多重光ネットワーク |
-
2002
- 2002-12-26 JP JP2002377789A patent/JP2004208215A/ja active Pending
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2003
- 2003-12-19 WO PCT/JP2003/016307 patent/WO2004059918A1/ja active Application Filing
- 2003-12-19 AU AU2003292573A patent/AU2003292573A1/en not_active Abandoned
- 2003-12-25 TW TW92136891A patent/TW200421781A/zh unknown
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2000224145A (ja) * | 1999-02-01 | 2000-08-11 | Hitachi Ltd | 光伝送装置および光伝送方法 |
JP2001230794A (ja) * | 1999-12-06 | 2001-08-24 | Kvh Telecom Co Ltd | リング型ネットワークを用いた通信システム及び方法 |
JP2001313660A (ja) * | 2000-02-21 | 2001-11-09 | Nippon Telegr & Teleph Corp <Ntt> | 波長多重光ネットワーク |
JP2001244954A (ja) * | 2000-02-25 | 2001-09-07 | Nec Corp | 超高速ネットワーク構築方式 |
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