JP2001168842A - Wavelength multiplex distribution selection type network and network unit used for the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently configure a network even by the use of the Internet or the like, where burst traffic fluctuation takes place through the effective utilization of the broadband performance of an optical fiber and the wavelength multiplex technology and to attain high-speed data communication at a low cost. SOLUTION: This network is configured, such that destination nodes are grouped and a specific wavelength is assigned to each group so as to share a transmission band in common. Furthermore, a combination between the transmission wavelength and the destination node making transmission with the wavelength is made variable, depending on a traffic state for each destination node and a receiver side sets a received wavelength and address information depending on the combination between the transmission wavelength and the destination node so as to revise the operating wavelength between the transmission and reception nodes.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a wavelength division multiplexing / distribution / selection type network for efficiently transferring traffic such as the Internet having a lot of traffic fluctuation, and a network device used for the network.

[0002]

2. Description of the Related Art In recent years, video cameras and personal computers have become widespread at homes, and it has become easy to process audio, video, and data at homes. Also,
Video information compression / expansion methods such as JPEG and MPEG have also become widespread, and communication of not only audio but also video information has already become widespread in each home as seen on the Internet.

[0003] The current Internet is constituted by a network of a system in which nodes (routers) are connected on a one-to-one basis. In order to transmit such a video information signal in such a network, it is necessary to secure link capacity between the nodes according to the maximum value of the required bandwidth.

[0004]

It is said that traffic on the Internet that handles audio, video, and data fluctuates in bursts. It is extremely wasteful to cope with such a burst-like traffic fluctuation by a network that connects the nodes on a one-to-one basis. For this reason, there is an increasing demand for a system that can flexibly switch the bandwidth used between the nodes according to demand.

[0005] Further, with the advancement of the broadband characteristics and wavelength multiplexing technology of the optical fiber, a large band can be provided at a low price. However, a demand for a system that efficiently uses the large band is increasing.

The present invention makes effective use of the broadband property and wavelength multiplexing technology of an optical fiber to efficiently configure a network even on the Internet or the like where bursty traffic fluctuation occurs, and enables high-speed data communication at low cost. And a network device used for the same.

[0007]

SUMMARY OF THE INVENTION A wavelength division multiplexing distribution type network and network equipment according to the present invention divides destination nodes into groups and assigns a unique wavelength to each group. That is, the same transmission wavelength is used for a plurality of nodes in each group, and the transmission band is shared. As a result, even when traffic fluctuations are taken into account, network utilization efficiency can be improved by the statistical multiplexing effect.

Further, the wavelength division multiplexing distribution selection type network and network equipment of the present invention make the combination of the transmission wavelength and the destination node transmitted at the wavelength variable according to the traffic situation of each destination node, By setting the reception wavelength and the address information according to the combination of the wavelength and the destination node, the wavelength used between the transmission and reception nodes is changed. Thereby, the combination of nodes transmitted at the same wavelength can be changed according to the traffic situation, and the use efficiency within the link can be increased.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment: Claim 1) FIG. 1 shows a first embodiment of the present invention. In the figure, nodes 0 to 6 are connected to n optical fibers # 0 to #n forming an optical fiber ring network via a multiplexing / demultiplexing device 11, respectively. Each node transmits a wavelength multiplexed signal such that the wavelength does not overlap with the optical signal from another node in the same optical fiber, and the wavelength setting between the optical fibers is independent from each other. In the following description, the optical fiber # 0
Will be described as an example.

The feature of this embodiment is that destination nodes transmitted from each node are divided into groups, and transmission wavelengths addressed to each group are set to be different from each other. For example, the relationship between the destination node and the transmission wavelength when transmitting from the node 0 is set as shown in FIG.

That is, the optical signal of the wavelength λ1 is transmitted from the node 0 to the nodes 1 and 5 of the group A to the optical fiber # 0. From node 0 to nodes 2 and 3 of group B,
The optical signal having the wavelength λ2 is transmitted to the optical fiber # 0. From the node 0 to the nodes 4 and 6 of the group C, the optical signal of the wavelength λ4 is transmitted to the optical fiber # 0. Similarly, when transmitting from other nodes 1 to 6, the same transmission wavelength is used for each group. However, the grouping of destination nodes transmitted from each node is not limited to three, and the number of nodes constituting each group does not need to be uniform.

As described above, by sharing the band that can be transmitted by one wavelength among a plurality of nodes in the same group, the link capacity does not need to be the sum of the maximum used bands of the destination nodes belonging to the same group. Multiple effects are expected, and link use efficiency can be improved. Therefore, a large-capacity network can be configured at low cost.

Note that transmission from one node to one or more nodes in the group is called "unicast" here. An optical signal transmitted at the same wavelength to a plurality of nodes in the group is received by each node, and then the address information of the electric signal is detected to selectively receive the signal addressed to the own node.

On the other hand, transmission from each node to all other nodes is called "multicast".
FIG. 1 shows that the wavelength used for multicast from the node 0 to the nodes 1 to 6 is λ19. Although multicast will not be described in detail, the wavelength division multiplexing distribution selection type network of the present invention is applicable to a hybrid network capable of performing both unicast and multicast.

FIG. 2 shows an example of assigning wavelengths transmitted and received between nodes according to the first embodiment. When transmitting from node 0, the destination nodes are divided into three groups as shown in FIG. 1 (b), and wavelengths .lambda.1, .lambda.2, and .lambda.4 are assigned to the respective groups. When transmitting from the node 1, the destination node is divided into two groups, and the wavelengths λ3 and λ5 are assigned to each group. Similarly, the destination nodes are divided into a plurality of groups (here, two or three) for each node, and transmission is performed using one wavelength to the nodes of each group. Also, for multicast from each node to the other six nodes,
Wavelengths λ19 to λ25 are assigned respectively.

On the other hand, each node is configured to receive the assigned wavelength. For example, node 0
Now, wavelengths λ3,
It receives six wavelengths of λ6, λ8, λ12, λ14, λ15 and six wavelengths of wavelengths λ20 to λ25 transmitted by multicast.

FIG. 3 shows a configuration example of the node 0 and the multiplexing / demultiplexing device 11 in the first embodiment. It should be noted that the multiplexer / demultiplexer 11 shows only a portion related to the optical fiber # 0. In addition, the node 0 and the multiplexer / demultiplexer 11 show only a portion related to the unicast, and a portion related to the multicast is the same, so that the description is omitted.

In the figure, an optical signal incident on the multiplexer / demultiplexer 11 from the optical fiber # 0 is spatially separated by the splitter 12 for each wavelength. A port corresponding to each wavelength is connected to one input port of an optical switch 13 having two inputs and two outputs, and a multiplexer 14 is connected to one output port. The optical signal multiplexed by the multiplexer 14 is transmitted to the optical fiber # 0.

Here, the node 0 comprises a transmitter 15 for transmitting optical signals of wavelengths λ1, λ2, λ4, and a wavelength λ3, λ6, λ8, λ1.
A receiver 16 is provided for receiving optical signals of 2, λ14 and λ15.
The receiver 16 includes a light receiver that converts an optical signal into an electric signal and an electric address filter that selects a signal addressed to the own node from the address of each electric signal. Each transmitter 15 is connected to the other input port of the optical switch 13 corresponding to the transmission wavelength, and each receiver 16 is connected to the other output port of the optical switch 13 corresponding to the reception wavelength.

The optical switch 13 has a pass mode shown in FIG. 3B, an add / drop mode shown in FIG.
Is set to one of the distribution modes shown in FIG. In the transmission mode, the optical signal of the corresponding wavelength is directly transmitted to the optical fiber # 0.
(Next node). In the distribution mode, the optical signal of the corresponding wavelength is distributed to both the node 0 and the optical fiber # 0 (the next node). In the present embodiment, such a distribution process is indispensable because the configuration is such that optical signals of the same wavelength are transmitted to a plurality of nodes.

In the add / drop mode, the optical signal of the corresponding wavelength is terminated, and the optical signal of the same wavelength transmitted from the transmitter of the node 0 is transmitted to the optical fiber # 0 (next node). Each node receives an optical signal addressed to its own node in the distribution mode. Since an optical signal of the transmission wavelength travels around the optical fiber ring network once, it is terminated and then newly transmitted to the same wavelength. Optical signals need to be transmitted.
The optical signal that has made one round of the optical fiber ring network may be connected to a receiver and monitored without being terminated.

In the multiplexer / demultiplexer 11 corresponding to the node 0,
The optical switches 13 corresponding to the transmission wavelengths λ1, λ2, λ4 are set to the add / drop mode, and the reception wavelengths λ3, λ6, λ8, λ
The optical switches 13 corresponding to 12, λ14, λ15 are set to the distribution mode, and the optical switches 13 corresponding to other wavelengths are set to the passing mode.

Thus, the reception wavelengths λ3, λ6, λ8, λ12,
The optical signals of λ14 and λ15 are distributed by the corresponding optical switches 13 and received by the corresponding receivers 16 of the node 0. For example, in the example shown in FIG. 2, since the optical signal having the wavelength λ3 is transmitted from the node 1 to the nodes 0, 3, and 4, the receiver 16 selects the signal addressed to the node 0 by the electric address filter. To receive. The optical signals of the transmission wavelengths λ1, λ2, λ4 are added / dropped by the corresponding optical switch 13 and multiplexed by the multiplexer 14 together with the optical signal passed or distributed through the optical switch.
Sent to 0.

Incidentally, the state of the optical switch 13 of the present embodiment is in three modes, but it may be two modes (add-drop mode and distribution mode). When the distance between nodes becomes long and an optical fiber amplifier is inserted into an optical fiber ring network, it is necessary to make the light intensity for each wavelength uniform. In this case, assuming that the light intensity of all wavelengths is aligned with the distribution mode having the largest light loss, the optical switch that is in the pass mode is used in the distribution mode.

In the present embodiment, if there is no change in the assignment of the transmission / reception wavelength of each node, the multiplexer / demultiplexer 11
It is not necessary to switch the mode of the optical switch 13 corresponding to each wavelength.

(Second Embodiment: Claim 2) FIG. 4 shows a first configuration example of a second embodiment of the present invention. FIG.
9 shows a second configuration example of the second embodiment of the present invention. FIG.
In 5, the configurations of the nodes 0 to 6 and the multiplexing / demultiplexing device 11 are the same as those of the first embodiment. Here, transmission and reception in the optical fiber # 0 will be described as an example.

The feature of this embodiment is that the destination nodes to be transmitted from each node are grouped, and when the transmission wavelengths to each group are set to be different from each other, the combination of the group configuration nodes can be changed. is there.

For example, if the combination of the nodes constituting the group in the node 0 is set as shown in FIGS. 4B and 5B, and an increase in traffic with the node 5 is expected, Then, as shown in FIG. 4C, the node 5 belongs to both the groups A and B. Alternatively, as shown in FIG. 5C, the node 1 belonging to the group A is moved to the group B, and the group A is set to the node 5 alone.

As described above, by changing the combination of the group-constituting nodes in the node 0 and allocating both the wavelengths λ1 and λ2 when transmitting to the node 5, or by allocating the wavelength λ1 exclusively,
It is possible to cope with an increase in traffic between the node 5 and the node 5.

On the other hand, in this case, a configuration is required in which each node can receive a wavelength other than the transmission wavelength of its own node, and switches the corresponding optical switch from the passing mode to the distribution mode. That is, in the example shown in FIG.
Changes the reception wavelength λ1 to λ1, λ2, and in the example shown in FIG. 5, the node 1 needs to change the reception wavelength λ1 to λ2.

FIG. 6 shows a first configuration example of the node 0 and the multiplexing / demultiplexing device 11 according to the second embodiment. Show. In addition, including the fifth configuration example described below, the multiplexing / demultiplexing device 11 shows only a portion related to the optical fiber # 0. In addition, the node 0 and the multiplexer / demultiplexer 11 show only a portion related to the unicast, and a portion related to the multicast is the same, so that the description is omitted.

In the figure, node 0 has transmission wavelengths λ1, λ
, .Lambda.18 other than the wavelengths .lambda.4, .lambda.18, which are connected to the corresponding optical switches, respectively, and correspond to the wavelengths .lambda.3, .lambda.6,. Is set to distribution mode. When stopping reception, the optical switch is switched from the distribution mode to the passing mode. When the optical switch is in the two modes (add / drop mode and distribution mode) as described above, there is no need to switch between the distribution mode and the passing mode.

With such a configuration of the multiplexing / demultiplexing device and the nodes, it is possible to switch the combination of the group-constituting nodes according to the use condition, and it is possible to use the link more efficiently. This is because all the optical signals in the optical fiber ring network are input to the multiplexing / demultiplexing device 11, and even if the transmission wavelength changes, simply changing the wavelength selected by the multiplexing / demultiplexing device and the receiving node. This is due to the feature of the wavelength division multiplexing distribution selection type network of the present invention that can cope with the above. The present embodiment is effective not only in the case of traffic fluctuation, but also in, for example, performing line duplication for improving reliability.

FIG. 7 shows a second configuration example of the node 0 and the multiplexer / demultiplexer 11 according to the second embodiment. Show. In the second embodiment, in the example shown in FIG. 6, receivers for all wavelengths other than the transmission wavelength of the own node are required,
There is a problem that leads to an increase in cost.

Therefore, by using the optical space switch 17 as shown in FIG. 7, the number of receivers 16 to be installed can be reduced, and the cost can be reduced. Optical space switch 1
7 includes wavelengths λ3, λ5,... Other than the transmission wavelengths λ1, λ2, λ4.
The optical signal of λ18 is distributed from the corresponding optical switch 13, and a reception wavelength is selected from the distribution and connected to the receiver 16. Accordingly, even when the reception wavelength is changed at each node due to the change in the combination of the group configuration nodes, it is possible to cope with this by slightly switching the receiver 16 and the optical space switch 17.

For example, when increasing the transmission band from the node 0 to the node 5, in the example shown in FIGS.
Since the wavelength .lambda.2 is added to the reception wavelengths .lambda.1, .lambda.5,..., The optical signal of the wavelength .lambda.2 can be received via the optical space switch 17 only by preparing a corresponding receiver. That is, it is not necessary to prepare receivers corresponding to all reception wavelengths as shown in FIG.

If the method shown in FIG. 5 is used, the optical space switch 17 in the node 1 connects the optical signal of the wavelength λ2 to the receiver instead of the wavelength λ1, so that a new receiver is not used. The transmission band to the node 5 can be increased by the receiver prepared initially.

FIG. 8 shows a third configuration example of the node 0 and the multiplexer / demultiplexer 11 according to the second embodiment. Show.

In the figure, optical signals of wavelengths λ3, λ5,..., Λ18 distributed from the optical switch 13 of the multiplexer / demultiplexer 11 are multiplexed by the multiplexer 18 and amplified by the optical amplifier 19, Dispensed at 20. A tunable filter 21 is connected to each output port of the optical coupler 20, and selects a required wavelength and connects it to the receiver 16. Thus, similarly to the optical space switch 17, it is possible to cope with a change in the reception wavelength with a minimum number of receivers.

In the configuration examples shown in FIGS. 7 and 8, the optical switch 13 connected to the transmitter 15 is set in the add / drop mode, and the optical signal of the transmission wavelength that has made one round of the optical fiber ring network is terminated. However, if it is accommodated in the optical space switch 17 or the multiplexer 18 and connected to the receiver 16, the transmission signal can be monitored.

FIG. 9 shows a fourth configuration example of the node 0 and the multiplexer / demultiplexer 11 according to the second embodiment. Show.

In the figure, a wavelength division multiplexed optical signal input from the optical fiber # 0 to the splitter 12 of the multiplexer / demultiplexer 11 is split by the optical coupler 22 and input to the node 0. The split wavelength-division multiplexed optical signal is amplified by an optical amplifier 19 and then split by a splitter 23 into respective wavelengths. A required wavelength is selected by an optical space switch 17 and connected to a receiver 16. As a result, it is possible to cope with a change in the reception wavelength with a minimum number of receivers and to monitor a transmission signal. Note that the optical coupler 22 may be arranged on the output side of the multiplexer 14.

In the present configuration example, the optical switch 13 of the multiplexer / demultiplexer 11 does not need a distribution function, and may be in two modes of passing and adding / dropping. This makes it possible to stabilize the switching characteristics as compared with providing the distribution function to the optical switch, and to realize the optical switch at low cost.

FIG. 10 shows a fifth configuration example of the node 0 and the multiplexing / demultiplexing device 11 in the second embodiment. Show.

In this configuration example, the functions of the duplexer 23 and the spatial light switch 17 of the fourth configuration example shown in FIG.
0 and the wavelength tunable filter 21. This is similar to the third configuration example shown in FIG. Also in this configuration example, the optical coupler 22 may be arranged on the output side of the multiplexer 14.

(Example of the configuration of the transmitting unit of the node suitable for the second embodiment: Claim 8) When changing the combination of the group-constituting nodes transmitting at the same wavelength, in the configuration having a buffer for each transmitter, If a large amount of data is stored in the transmission buffer of the previous wavelength, the transmission wavelength cannot be changed until all of the data has been transmitted. that is,
If the transmission wavelength is switched when the change of the transmission wavelength is decided, if the amount of data stored in the transmission buffer of the changed wavelength is small, data is transmitted at the new wavelength before the data remaining in the transmission buffer of the wavelength before the change. This is because a problem occurs in the receiving node in which the order of arrival of data is changed.

Therefore, as shown in FIG. 11, the transmitting section of the node suitable for the second embodiment includes transmission buffers 24-1 to 24-6 corresponding to the destination nodes, and the transmitters of the corresponding transmission wavelengths. 15-1 to 15-3. Here, an example is shown in which the combination of the group configuration nodes in the node 0 is changed as shown in FIG.

That is, the packet transmitted from the node 0 to the node 1 is stored in the transmission buffer 24-1 and the packet transmitted from the transmitter 15-1 of the transmission wavelength λ1 is transmitted from the transmitter 15-2 of the transmission wavelength λ2. Switch to send.
This switching can be performed by switching the bus output when the transmission buffer and the transmitter are connected in a bus configuration, for example, but may be configured using a switch. The configuration of the transmission buffer is not limited to a physically separated configuration, but may be a configuration managed logically for each destination node.

FIG. 12 shows an example of the configuration of a control system for changing the group configuration node in the second embodiment. The transmission control device 30 and the reception control device 40 are provided in the node. The transmission control device 30 and the reception control device 40 shown in the figure are provided in different nodes.

The transmission control device 30 monitors the traffic for each destination node by a transmission band management unit 31. The transmission control unit 30 grasps the traffic situation obtained by the transmission band management unit 31 so as to transmit a large amount of traffic efficiently. An output port control unit for controlling a combination of a wavelength and a destination node transmitted at the wavelength, and transmission information control for adjusting between the destination node and the combination of the transmission wavelength and the destination node determined by the output port control unit It is constituted by a unit 33. The transmission wavelength and the address information of the destination node controlled by the output port control unit 32 are set in the transmission unit 34.

The reception control device 40 includes a transmission information control unit 33
Information control unit 4 for exchanging information necessary for reception between
1. A reception port management unit 42 that monitors the usage status of a reception port, a reception port control unit 43 that sets a reception wavelength and address information based on a combination of a transmission wavelength and a destination node obtained by the reception information control unit 41 in the reception unit 44. It consists of. The receiving unit 44 is provided with the optical space switch 1 described above.
7, including a wavelength tunable filter 21 and a receiver 16.

The numbers in parentheses (1) to (10) in the figure indicate the processing procedure of the operation of changing the group configuration node. Hereinafter, the operation of changing the group configuration node according to the second embodiment according to the traffic fluctuation will be described.

(1) A transmission request is sent from the user. (2) The output port control unit 32 inquires of the transmission band management unit 31 about the usage status of each group.

(3) The transmission band management unit 31 estimates a transmission band when a band request from a user is accepted, and notifies the output port control unit 32 of the estimation. At this time, in the case of connectionless communication without a bandwidth request from a user, the transmission bandwidth management unit 31 grasps a change in the state of the output queue and the like,
Manage transmission bandwidth.

Here, if the bandwidth request from the user can be accepted, the transmission wavelength and the address information corresponding to the destination node are transmitted from the output port control unit 32 to the transmission unit 34.
Set to.

On the other hand, if the bandwidth request from the user cannot be accepted, the output port control unit 32 starts the process of changing the group configuration node. (4) The output port control unit 32 transmits the node number to be changed, the transmission wavelength after the change, the address information, and the like to the transmission information control unit 33.
Send to

(5) The transmission information control unit 33 notifies the reception information control unit 41 of the destination node to be changed of the changed transmission wavelength and address information. (6) The reception information control unit 41 inquires of the reception port management unit 42 whether or not there is a free space in the reception port.

(7) The reception port management unit 42 notifies the reception information control unit 41 of the availability of the reception port. (8) If there is a free space in the reception port, the reception information control unit 4
1 notifies the receiving port control unit 43 of the receiving port to be used and the address information.

(9) The receiving port control unit 43
And the address information is set in the address filter. (10) At the same time as (8), the reception information control unit 41 notifies the transmission information control unit 33 of permission to change the group configuration node. If there is no vacancy in the reception port, the reception information control unit 41 notifies the transmission information control unit 33 that the change of the group configuration node is not permitted.

(11) The transmission information control unit 33 notifies the information received from the reception information control unit 41 to the output port control unit 32. (12) The output port control unit 32 controls the transmitter 34 to change the transmission wavelength when the change of the group configuration node is permitted. With the above procedure, the combination of the group configuration nodes is changed, and transmission to each node is performed using the changed transmission wavelength and address information.

[0061]

As described above, according to the wavelength division multiplexing distribution selection type network and the network equipment of the present invention, the destination nodes are divided into groups, and the transmission bands are allocated to each group and a unique transmission wavelength is allocated, so that the traffic is shared. Even when fluctuations are taken into account, the network utilization efficiency can be increased by the statistical multiplexing effect. Further, by changing the combination of nodes transmitted at the same wavelength according to the traffic situation, it is possible to increase the use efficiency in the link.

As a result, a network can be efficiently formed even in the Internet or the like, which is bursty data traffic, and high-speed data communication can be realized at low cost.

The wavelength division multiplexing / selection type network of the present invention can be applied from the local network to the backbone by effectively utilizing the wideband property of the optical fiber.

[Brief description of the drawings]

FIG. 1 is a diagram showing a first embodiment of the present invention.

FIG. 2 is a diagram illustrating an example of assigning wavelengths transmitted and received between nodes according to the first embodiment;

FIG. 3 is a diagram illustrating a configuration example of a node 0 and a multiplexer / demultiplexer 11 according to the first embodiment.

FIG. 4 is a diagram showing a first configuration example according to a second embodiment of the present invention.

FIG. 5 is a diagram showing a second configuration example according to the second embodiment of the present invention.

FIG. 6 is a diagram illustrating a first configuration example of a node 0 and a multiplexing / demultiplexing device 11 according to the second embodiment.

FIG. 7 is a diagram showing a second configuration example of the node 0 and the multiplexing / demultiplexing device 11 in the second embodiment.

FIG. 8 is a diagram showing a third configuration example of the node 0 and the multiplexing / demultiplexing device 11 in the second embodiment.

FIG. 9 is a diagram showing a fourth configuration example of the node 0 and the multiplexing / demultiplexing device 11 in the second embodiment.

FIG. 10 is a diagram showing a fifth configuration example of the node 0 and the multiplexing / demultiplexing device 11 in the second embodiment.

FIG. 11 is a diagram illustrating a configuration example of a transmission unit of a node suitable for the second embodiment.

FIG. 12 is a diagram showing a configuration example of a control system for changing a group configuration node.

[Explanation of symbols]

 REFERENCE SIGNS LIST 11 multiplexer / demultiplexer 12 demultiplexer 13 optical switch 14 multiplexer 15 transmitter 16 receiver 17 optical space switch 18 multiplexer 19 optical amplifier 20, 22 optical coupler 21 wavelength tunable filter 23 demultiplexer 24 transmission buffer 30 Transmission control device 31 Transmission band management unit 32 Output port control unit 33 Transmission information control unit 34 Transmission unit 40 Reception control device 41 Reception information control unit 42 Reception port management unit 43 Reception port control unit 44 Reception unit

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H04Q 3/52 H04L 11/00 330 F term (Reference) 5K002 AA01 AA03 BA02 BA05 BA06 DA02 DA09 DA11 FA01 5K031 CA15 CB10 CC04 DA11 DA19 DB11 DB12 DB14 5K069 AA18 BA01 BA09 CA06 CB10 DB33 EA24 EA25 EA28 FA11

Claims (15)

[Claims] 1. An optical fiber ring network composed of one or more optical fibers, and an optical signal having a wavelength transmitted from a connected node by demultiplexing a wavelength multiplexed optical signal of the optical fiber ring network. Add and drop, distribute the optical signal of the wavelength received by the connected node, multiplex the add / drop and the distribution and the optical signal of all the wavelengths passing therethrough and transmit to the optical fiber ring network In a wavelength division multiplexing / selection type network comprising a device and a plurality of nodes connected to the optical fiber ring network via the multiplexing / demultiplexing device, the node groups transmission destination nodes,
Transmitting means for assigning a unique wavelength to each group and transmitting the signal; receiving an optical signal of the wavelength assigned to the group to which the own node belongs; and receiving a signal addressed to the own node from address information included in the electric signal. A wavelength division multiplexing / selection type network, comprising: receiving means for selecting. 2. The wavelength division multiplexing distribution selection type network according to claim 1, wherein a combination of destination nodes forming a group transmitted from each of said nodes at the same wavelength can be changed. Wavelength multiplexing distribution-selective network. 3. The wavelength division multiplexing distribution selection type network according to claim 1, wherein said node has receiving means for the number of transmission wavelengths of all nodes or the number of wavelengths obtained by subtracting the number of transmission wavelengths of its own node therefrom. A wavelength division multiplexing / selection type network, wherein the multiplexer / demultiplexer is configured to distribute an optical signal of a wavelength received by a connected node to corresponding receiving means. 4. The wavelength division multiplexing distribution selecting network according to claim 1, wherein said multiplexer / demultiplexer distributes the demultiplexed optical signal of each wavelength to connected nodes. A wavelength division multiplexing / selection network, characterized in that the node comprises an optical space switch for selecting an optical signal of a wavelength to be received from the optical signals of the respective wavelengths and connecting to a receiving means. 5. The wavelength division multiplexing distribution selecting network according to claim 1, wherein the multiplexing / demultiplexing device distributes the demultiplexed optical signals of each wavelength to connected nodes. The node includes: a multiplexer that multiplexes the optical signals of the respective wavelengths; a splitter that splits the multiplexed wavelength multiplexed optical signal; and an optical signal of a wavelength that is received from the split wavelength multiplexed optical signal. A wavelength-division multiplexing / selection network, comprising: 6. The wavelength division multiplexing distribution selecting network according to claim 1, wherein the multiplexer / demultiplexer removes a function of distributing an optical signal of a wavelength received by a connected node, and removes the optical signal. The wavelength division multiplexed optical signal of the fiber ring network is branched to a connected node, wherein the node receives the wavelength division multiplexed optical signal from the demultiplexer and the demultiplexed optical signal of each wavelength. An optical space switch for selecting an optical signal having a wavelength and connecting to a receiving means. 7. The wavelength division multiplexing distribution selecting network according to claim 1, wherein the multiplexer / demultiplexer removes a function of distributing an optical signal of a wavelength received by a connected node, and removes the optical signal. The wavelength division multiplexed optical signal of the fiber ring network is branched to a connected node. The node comprises: a branching device for branching the wavelength multiplexed optical signal; and a light having a wavelength received from each of the branched wavelength multiplexed optical signals. A wavelength division multiplexing / selection type network, comprising: a wavelength tunable filter for selecting a signal and connecting to a receiving means. 8. The wavelength division multiplexing / selection type network according to claim 1, wherein the transmission means of the node comprises: a transmission buffer provided for each destination node; Wavelength multiplexing, wherein connection between each transmission buffer and each transmitter is switched, and data in each transmission buffer is transmitted from a transmitter having a wavelength assigned to each destination node. Distribution-selective network. 9. The wavelength division multiplexing distribution selecting network according to claim 2, wherein a transmission band management unit for monitoring traffic for each destination node, and a transmission wavelength and a transmission wavelength corresponding to the traffic condition obtained by the transmission band management unit. An output port control unit that controls a combination of destination nodes transmitted by wavelengths and sets a transmission wavelength and address information according to the combination in a transmitter, and a combination of a transmission wavelength and a destination node determined by the output port control unit. A transmission control device having a transmission information control unit that adjusts with a destination node, a reception information control unit that exchanges information necessary for reception with the transmission information control unit, and a usage status of a reception port. A receiving port management unit to be monitored, a receiving wavelength and an address based on a combination of a transmission wavelength and a destination node obtained by the receiving information control unit; Wavelength multiplexing broadcast-and-select network, characterized in that a reception control device having a receive port controller that sets the receiver to broadcast. 10. A wavelength division multiplexed optical signal of an optical fiber ring network composed of one or a plurality of optical fibers is demultiplexed, an optical signal of a wavelength transmitted from a connected node is added and dropped, and connection is performed. A multiplexer / demultiplexer for distributing an optical signal of a wavelength received by the selected node, multiplexing optical signals of all wavelengths passing through add / drop, distribution, and transmission to the optical fiber ring network; A transmission unit connected to the optical fiber ring network via a device, divides destination nodes to be transmitted into groups, and allocates and transmits a unique wavelength to each group, and a wavelength allocated to the group to which the own node belongs; And a receiving means for receiving the optical signal and selecting a signal addressed to the own node from address information included in the electric signal. Network equipment used in the wavelength-multiplexed broadcast-and-select network according to 2. 11. The network device according to claim 10, wherein the node includes receiving units for the number of transmission wavelengths of all nodes or the number of wavelengths obtained by subtracting the number of transmission wavelengths of the own node from the transmission wavelength. Is a configuration of distributing an optical signal of a wavelength received by a connecting node to corresponding receiving means. 12. The network device according to claim 10, wherein the multiplexing / demultiplexing device is configured to distribute the demultiplexed optical signals of the respective wavelengths to connected nodes, and wherein the node includes the respective wavelengths. A network device comprising: an optical space switch that selects an optical signal having a wavelength to be received from the optical signal and connects the optical signal to a receiving unit. 13. The network device according to claim 10, wherein the multiplexing / demultiplexing device is configured to distribute the demultiplexed optical signals of the respective wavelengths to connected nodes, and the node includes the respective wavelengths. A multiplexer for multiplexing the optical signals of the above, a splitter for splitting the multiplexed wavelength multiplexed optical signal, and an optical signal of a wavelength to be received from each of the split wavelength multiplexed optical signals is selected and connected to the receiving means. And a wavelength tunable filter. 14. The network device according to claim 10, wherein the multiplexer / demultiplexer removes a function of distributing an optical signal having a wavelength received by a connected node, and the wavelength division multiplexed optical signal of the optical fiber ring network. The node branches to a connected node, wherein the node selects a demultiplexer for demultiplexing the wavelength-multiplexed optical signal, and an optical signal of a wavelength to be received from the demultiplexed optical signal of each wavelength. A network device, comprising: an optical space switch connected to a receiving unit. 15. The network device according to claim 10, wherein the multiplexing / demultiplexing device removes a function of distributing an optical signal having a wavelength received by a connected node, and the wavelength division multiplexing optical signal of the optical fiber ring network. Is connected to a connected node, wherein the node selects a splitter for splitting the wavelength multiplexed optical signal, and an optical signal having a wavelength to be received from each of the split wavelength multiplexed optical signals. A network device comprising a tunable filter to be connected.