JP3964336B2 - Optical wavelength division multiplexing communication system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an optical wavelength division multiplexing communication system that multiplexes and transmits a plurality of optical signals in an optical wavelength region and selectively receives signals of a desired optical wavelength to transmit and receive information. In particular, the present invention relates to an optical wavelength multiplexing communication system suitable for use in a distributed arithmetic processing system, a broadband video distribution system, a LAN, a VPN system, and the like.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a technique has been implemented in which a plurality of optical signals are multiplexed and transmitted in an optical wavelength region, and information is transmitted and received by being separated into a plurality of optical wavelength signals at a receiving end. (For example, see Non-permitted Document 1.)
[0003]
[Non-permitted literature 1]
Abdellatif Marrakchi, “Photonic Switching and Interconnects”, Marcel Dekker, Inc. , 1994, Chapter 2, p. 77-88
[0004]
[Problems to be solved by the invention]
In the above conventional configuration, when one of optical signals transmitted by a plurality of optical wavelengths is selectively transmitted / received, a signal having a desired optical wavelength is selected by an optical wavelength filter or the like.
However, in the prior art, since the switching of the optical wavelength is centrally controlled regardless of the transmission / reception of the packet, the selection of the optical wavelength and the processing in the upper layer cannot be made consistent.
[0005]
For this reason, for example, there has been a problem that routers, switches, and the like that perform IP layer processing need to be installed according to the number of network nodes or the number of hosts.
In addition, when performing one-to-many information transmission / reception at the same time, there is a problem that it is necessary to install routers, switches, etc. that perform IP layer processing in accordance with the number of network nodes or the number of hosts.
[0006]
Also, routers, switches, etc. that perform these IP layer processing cannot perform broadband optical signal processing due to the limitations of the electrical signal processing speed, and make the best use of the available bandwidth of the optical transmission line. I could not.
The present invention has been made in view of such circumstances, and can perform broadband optical signal processing without being limited by the electrical signal processing speed of routers, switches, etc. that perform IP layer processing, and is inexpensive. An object of the present invention is to provide an optical wavelength division multiplexing communication system capable of constructing a distributed arithmetic processing system, a LAN, and a VPN system.
[0007]
[Means for Solving the Problems]
To achieve the above object, the present invention includes a plurality of server devices, and a plurality of client devices, Rutotomoni provided corresponding to each of the plurality of server devices, optical wavelength assigned to the corresponding server device The first optical wavelength variable transmission / reception device group in which the optical wavelength is set so as to transmit / receive only the optical signal and the plurality of client devices are provided corresponding to each of the plurality of client devices, and transmits / receives an optical signal having a desired optical wavelength. A second optical wavelength tunable transmitter / receiver group capable of setting an optical wavelength, and the first optical wavelength tunable transmitter / receiver group and the second optical wavelength tunable transmitter / receiver group via a transmission line. a connected wavelength-division multiplexing system comprising, prior Symbol transmission line is connected through the optical wavelength multiplexing distributor to the first optical wavelength tunable transceiver group, a plurality of optical add-drop device, respectively A first transmission line group of kicked, the second and the second transmission path group for connecting the respective each before and Symbol optical add-drop device for an optical wavelength tunable transceiver group, in the configured main signal An optical bus for transmitting (information), the plurality of server devices, the plurality of client devices, the first variable optical wavelength transmission / reception device group, the second variable optical wavelength transmission / reception device group, and the plurality of light An optical multiplex communication system characterized in that an add / drop device is connected via a control bus for transmitting / receiving control information between the devices, and a client device exchanges information with a desired server device. is there.
[0008]
In the optical multiplex communication system according to the present invention, the optical add / drop device includes an optical circulator, an optical disk filter, an optical coupler, and an optical amplifier.
[0009]
Further, the present invention is the optical multiplex communication system described above, wherein each of the optical wavelength tunable transmission / reception devices of the second optical wavelength tunable transmission / reception device group exchanges information on the occupied optical link with each other via the control bus. It is characterized by doing.
[0010]
Further, the present invention is the above-described optical multiplex communication system, wherein each optical wavelength tunable transmission / reception device of the second optical wavelength tunable transmission / reception device group is occupied by the server device and the client device. This information is mutually exchanged via a control bus.
[0011]
Further, in the optical multiplex communication system according to the present invention , each optical wavelength tunable transmission / reception device of the second optical wavelength tunable transmission / reception device group responds to an optical link request from the server device and the client device. An optical link setting is performed in response to an optical link release request from the server device and the client device.
[0012]
According to the present invention, in the above-described optical multiplex communication system, each optical wavelength variable transceiver in the second optical wavelength variable transceiver group includes a disk filter, an optical wavelength variable transmitter, and a controller connected to an internal bus. The control device is connected to the control bus and performs optical link setting according to a control signal from the control bus.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 shows a configuration of an optical wavelength division multiplexing communication system according to an embodiment of the present invention. In FIG. 1, the optical wavelength division multiplexing communication system according to the present embodiment is provided corresponding to each of a plurality of server apparatuses 1-1 to 1-N and the plurality of server apparatuses 1-1 to 1-N. First optical wavelength variable transmission / reception device groups 2-1 to 2-N in which optical wavelengths are set so as to transmit / receive optical signals of optical wavelengths assigned to corresponding server devices, and the first optical wavelength variable transmission / reception This is an optical wavelength division multiplexing communication system in which a plurality of client apparatuses 4-1 to 4-M are connected to the apparatus groups 2-1 to 2-N via a transmission line including the optical wavelength division multiplexing apparatus 3.
[0014]
The optical wavelength division multiplexing communication system further includes second optical wavelength variable transmission / reception device groups 5-1 to 5-M provided corresponding to the plurality of client devices 4-1 to 4-M, respectively. The transmission path includes an optical data bus 10 that transmits a main signal (information) provided with a plurality of optical add / drop devices 7-1 and 7-2, and includes a plurality of client devices 4-1 to 4- Each of M is connected to any one of the optical add / drop devices via each of the second optical wavelength variable transmission / reception device groups 5-1 to 5-M by the optical data bus 10, and Each device is connected via a control bus 20 for transmitting and receiving control information, and each client device exchanges information with a desired server device. The optical data bus 10 corresponds to the optical bus of the present invention, and the control data bus 20 corresponds to the control bus of the present invention.
[0015]
Next, the overall operation of the optical wavelength division multiplexing communication system will be described with reference to FIG.
Here, the operation when the optical wavelength division multiplexing communication system according to the present invention is applied to a distributed arithmetic processing device will be described. As an example, each server performs different arithmetic processing.
[0016]
The client apparatuses 4-1 to 4-M refer to the calculation results of the desired server apparatuses 1-1 to 1-N, acquire data, perform necessary calculation processing based on the calculation results, and obtain the calculation results. Transfer to desired server apparatuses 1-1 to 1-N. An optical data bus 10 is formed between the server device and the client device via the optical wavelength division multiplexing device 3, the optical coupler, and the optical add / drop device. As an example, different optical wavelengths λ1 to λN are allocated to the server apparatuses 1-1 to 1-N, respectively, and the client apparatuses 4-1 to 4-M select a desired optical wavelength allocated to the server, Information shall be sent and received.
[0017]
Further, when information is transmitted / received between the client apparatuses, information is transmitted / received by setting an optical wavelength mutually using an unused optical wavelength on the optical data bus 10.
Each device is connected to an optical data bus 10 for transmitting / receiving a main signal (data) and a control data bus 20 for transmitting / receiving control information. Signal transmission / reception between the server apparatus and the client apparatus on the optical data bus 10 is performed after the optical link established via the control data bus 20 is established.
[0018]
The control data bus 20 is, for example, Ethernet (registered trademark). Each device connected to the control data bus 20 has an IP address in advance, and IP communication is possible between the devices.
An optical coupler may be used to form a plurality of optical data buses 10, and a plurality of client devices can refer to data transmitted from the server at the same time, thereby shortening the time for data reference. It becomes possible.
The control data bus 20 transmits and receives control packets for controlling the optical wavelength variable transmission / reception device, disk filter, and the like. As an example, a UDP packet that includes information such as an optical wavelength to be set, a transmission center wavelength, setting timing information, a disk filter module number to be set, information indicating a current setting status, and other additional information is used. It is possible.
Based on the control packet information, each optical wavelength variable transmission / reception device, disk filter, and the like perform desired operations and information exchange to establish an optical link.
[0019]
Next, an operation when the optical wavelength division multiplexing communication system according to the present invention is applied to a video distribution system will be described. As an example, different optical wavelengths λ1 to λN are assigned to the server apparatuses 1-1 to 1-N, respectively, and optical signals from the optical wavelengths λ1 to λN are optically wavelength-multiplexed to the client apparatuses 4-1 to 4-M. Shall be transmitted.
[0020]
When viewing the video from the server apparatus 1-1 in the client apparatus 4-1, the variable optical filter of the client apparatus 4-1 is set to the optical wavelength [lambda] 1, so that optical transmission with the server apparatus 1-1 is performed. A route is established and desired video content can be viewed. The server device and the client device transmit and receive data using IP packets.
[0021]
As an example, a unique IP address is assigned to the server device and the client device in the same IP segment. A multicast address can also be used as the IP address. The video contents stored in the server apparatuses 1-1 to 1-N and the information on the corresponding optical wavelength and the IP address of the server are managed by the server apparatus 1-1 as an example. Can be connected to the server device 1-1 to obtain the video content information at the time of initial setting.
[0022]
The video content, the optical wavelength, and the IP address information of the server device are also transferred to the IP packet identification device at the initial setting so that a desired optical wavelength can be selected when controlling the optical wavelength control device. If the video content required by the client is determined based on the video content information, the optical wavelength to be transmitted by the variable optical filter and the destination address of the IP packet transmitted from the client device can be determined.
[0023]
When distributing video content from a server device to a plurality of client devices, various methods are possible in addition to a method of arranging client devices on a plurality of optical data buses by an optical coupler. One method is a method in which one optical wavelength signal assigned to a server device is transmitted to a plurality of client devices, and desired data is extracted by an application on the client device side.
[0024]
According to another method, the server device assigns a unique optical wavelength for connection with each client device in response to a viewing request from the client device, and the optical signal is transmitted from the server device as a different optical wavelength signal for each client device. Is a method of sending In this case, the usage status of the optical wavelength is managed by centrally managing the server apparatus 1-1 as a master server so that the optical wavelengths to be used do not compete.
[0025]
Use optical wavelength information can be exchanged between server devices by a method of setting a management optical wavelength path between server devices, or by configuring a separate network for transmitting and receiving management information between server devices. is there. This optical wavelength management information is also shared by the optical wavelength variable transmission / reception apparatus connected to the server apparatus.
The optical wavelength variable transmission / reception device connected to the server device transmits / receives an optical signal at the optical wavelength assigned to the server device. Also, when managing the usage status of the optical wavelength, the management information is exchanged between the server devices.
[0026]
Next, FIG. 2 shows an example of a specific configuration of the main part of the optical wavelength multiplexing communication system shown in FIG. In the same figure, optical add / drop devices 7-1 to 7-4 (only 7-1 and 7-3 are shown in FIG. 2 for convenience of explanation) include an optical circulator 70, an optical disk filter 71, An optical coupler 72 and an optical amplifier 73 are included.
The setting of the optical wavelength in the figure is an example, and other wavelengths may be assigned.
Further, according to the state of the optical link, it is also possible to share the assigned wavelength in time, assign various vacant wavelengths, release the optical wavelength at the end of use, and rearrange the assigned wavelength.
[0027]
In addition, the optical wavelength variable transmission / reception devices 5-1 to 5-M connected to the client device side are configured by a disk filter 71, an optical wavelength variable transmission device 5-1A, and a control device 50 connected to the internal bus 30, respectively. Then, the control device 50 is connected to the control data bus 20 and performs optical link setting according to a control signal from the control data bus 20.
[0028]
Reference numerals 6-1A and 6-1B denote AWGs (Arrayed Waveguide Gratings), which constitute an optical wavelength division multiplexing apparatus 6-1. The disk filter is a component of the optical add / drop device and also a component of the optical wavelength variable transmission / reception device connected to the client device side. The control device 50, the optical add / drop device, and the variable wavelength transmission device are each mounted as a package, for example, and can be accommodated in one housing. At this time, each device is connected by an internal bus (for example, a compact PCI (c-PCI) bus) 30 in the housing.
[0029]
In the above configuration, for example, in the optical add / drop device 7-1, the optical signal on the optical data bus 10 is input to the port 1 of the optical circulator 70 and is emitted from the port 2. Of the emitted optical signal, only an optical signal having a desired optical wavelength is transmitted through the optical disc 71, and the other optical signals are reflected by the disc surface of the disc filter 71 and guided to the optical coupler 72 from the port 3 of the optical circulator 70. . This optical signal is appropriately combined with the inserted optical signal, controlled to an appropriate optical output by the optical amplifier 73, and then transmitted to the optical data bus 10.
[0030]
The disk filter 71 and the optical wavelength variable transmitter (for example, the optical wavelength variable transmitter 5-1A in FIG. 2) are connected to each other via a bus and further connected to the control device 50. In response to an optical link request from the control data bus 20, the control device 50 appropriately controls the disk filter 71 and the optical wavelength variable transmission device 5-1A via the internal bus 30 such as PCI or c-PCI. .
[0031]
Next, an operation when an optical link is established between the server apparatus 1-1 and the client apparatus 4-1 will be described. When it is desired to newly establish an optical link with the client apparatus 4-1 in the server apparatus 1-1, a request is transmitted to the client apparatus 4-1 through the control data bus 20.
It is assumed that the server apparatus 1-1 transmits and receives information on unused optical wavelengths in the optical data bus 10 each time the usage state is changed, and has current unused optical wavelength information.
[0032]
When the client device 4-1 responds to a request from the server device 1-1, the client device 4-1 sends an optical link request for the optical wavelength requested from the server device 1-1 to the control device 50. Send an establishment control signal.
In response to the establishment control signal, the control device 50 sends a control signal to the disk filter 71 and the optical wavelength variable transmission device 5-1A via the internal bus 30 to perform control.
[0033]
After the control of the disk filter 71 and the optical wavelength variable transmission device 5-1A is completed, the control device 50 transmits a control completion notification to the client device 4-1 and the server device 1-1. Through the above procedure, an optical link is established between the server device 1-1 and the client 4-1.
[0034]
According to the optical wavelength division multiplexing communication system according to the present embodiment, the establishment of an optical link required for transmission / reception of a large-capacity signal can be controlled by transmission / reception of a control signal on the control bus, and thus, for example, applied to arithmetic processing. In this case, autonomously distributed control is possible according to the calculation state of each arithmetic device.
[0035]
In addition, by appropriately controlling the establishment of the optical link of the optical data bus, only the required optical link is set for the required time, and then released, so that the maximum transmission capacity of the optical link can be utilized and the optical data bus can be used. Can improve the efficiency of use.
In addition, unnecessary reflected return light in the optical component can be prevented and the optical power loss of the optical signal on the optical data bus can be compensated, so that the number of components in the entire system can be reduced and the cost can be reduced.
[0036]
【The invention's effect】
As described above, according to the present invention, it becomes possible to perform broadband optical signal processing without being affected by the limit of the electrical signal processing speed of routers, switches, etc. that perform IP layer processing. In addition, a distributed arithmetic processing system, a LAN, and a VPN system can be constructed.
In addition, according to the present invention, in a video distribution system for a specific application, a high-speed IP router or an IP switch is not required, so that the system can be constructed at low cost.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a basic configuration of an optical wavelength division multiplexing communication system according to the present invention.
2 is a block diagram showing an example of a specific configuration of a main part of the optical wavelength multiplexing communication system shown in FIG. 1;
[Explanation of symbols]
1-1 to 1-N ... server devices 2-1 to 2-N ... optical wavelength tunable transceiver (first optical wavelength tunable transceiver group)
3, 6-1 to 6-M optical wavelength division multiplexing devices 4-1 to 4-M client devices 5-1 to 5-M optical wavelength variable transmission / reception devices (second optical wavelength variable transmission / reception device group)
5-1A ... Optical wavelength variable transmitters 6-1A, 6-1B ... AWG
7-1 to 7-4: Optical add / drop device 10: Optical data bus 20 ... Control data bus 30 ... Internal bus 50 ... Control device 70 ... Optical circulator 71 ... Disk filter 72 ... Optical coupler 73 ... Optical amplifier

Claims (6)

A plurality of server devices, and a plurality of client devices, Rutotomoni provided corresponding to each of the plurality of server devices, optical wavelength to transmit and receive only the optical signal of the corresponding light wavelength assigned to the server device a first optical wavelength tunable transceiver group to be set, together with the provided corresponding to each of the plurality of client devices, the second light can be set optical wavelength to transmit and receive optical signals having a desired optical wavelength An optical wavelength division multiplexing communication system comprising: a variable wavelength transmission / reception device group , wherein the first optical wavelength variable transmission / reception device group and the second optical wavelength variable transmission / reception device group are connected via a transmission line; ,
Before Symbol transmission line,
A first transmission line group connected to the first optical wavelength variable transmission / reception device group via an optical wavelength multiplexing / distributing device, each provided with a plurality of optical add / drop devices ;
A second transmission path group for connecting the respective each before and Symbol optical add-drop device of the second optical wavelength tunable transceiver group,
Is an optical bus that transmits the main signal (information) composed of
The plurality of server devices, the plurality of client devices, the first optical wavelength variable transmission / reception device group, the second optical wavelength variable transmission / reception device group, and the plurality of optical add / drop devices are controlled between the devices. Connected via a control bus to send and receive information,
An optical wavelength division multiplexing communication system, wherein a client device exchanges information with a desired server device.   2. The optical wavelength division multiplexing communication system according to claim 1, wherein the optical add / drop device includes an optical circulator, an optical disk filter, an optical coupler, and an optical amplifier.   3. The optical wavelength tunable transmitter / receiver in the second optical wavelength tunable transmitter / receiver group exchanges information on occupied optical links with each other via the control bus. An optical wavelength division multiplexing communication system according to claim 1.   Each optical wavelength variable transmission / reception device of the second optical wavelength variable transmission / reception device group mutually exchanges information on the occupied optical link to the server device and the client device via a control bus. The optical wavelength division multiplexing communication system according to any one of claims 1 to 3.   Each optical wavelength variable transmission / reception device of the second optical wavelength variable transmission / reception device group opens the optical link from the server device and the client device in response to an optical link request from the server device and the client device. The optical wavelength division multiplexing communication system according to any one of claims 1 to 4, wherein an optical link is set in response to a request. Each optical wavelength variable transmission / reception device of the second optical wavelength variable transmission / reception device group includes a disk filter connected to an internal bus, an optical wavelength variable transmission device, and a control device.
6. The optical wavelength division multiplexing communication system according to claim 1, wherein the control device is connected to the control bus and performs optical link setting according to a control signal from the control bus.

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