CN103581772A - Method and device for achieving optical burst add-drop multiplexer - Google Patents
Method and device for achieving optical burst add-drop multiplexer Download PDFInfo
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Abstract
The invention relates to a method and device for achieving an optical burst add-drop multiplexer. The method comprises the steps that an optical burst switching node receives a local service data packet sent by a user side; OBS service convergence processing is conducted on the local service data packet, and an OBS service type data packet is obtained; electro-optical conversion is conducted on the OBS service type data packet, and a burst data packet is obtained; the burst data packet and a line of optical signals processed through an optical coupler in a spectral mode are selectively sent outwards through a wavelength selective switch. According to the method and device, the OBS node is achieved through the wavelength selective switch and a single high-speed optical switch, the problems that when a traditional OBADM is achieved, a large number of high-speed optical switch arrays, burst type optical modules and burst type optical amplifiers, and technique is not mature enough or cost is high are solved, a relatively large OBS looped network can be built easily, and slide expansion upgrading of the OBS looped network and large-scale application of the optical burst exchange technique can be achieved with low cost.
Description
Technical field
The present invention relates to light burst-switched (OBS) technical field, relate in particular to a kind of method and device of realizing fixing transmission selective reception type (FTTR) light burst add-drop multiplexer in optical outburst switching loop network.
Background technology
Along with the development of network application, the Internet traffic is also in growth at full speed, and the mode that completes exchange in signal of telecommunication territory can not meet the high speed requirement of network traffics, causes rate limit, and thus, light switching technology becomes the core technology of optical-fiber network of future generation.
At present, light switching technology mainly contains light path exchange (OCS), light packet switching (OPS) and light burst-switched (OBS).Wherein:
In light path switching technology, for fear of the phase mutual interference between optical channel, the different optical channels on same optical fiber link must have different wavelength.But due to the restriction of wavelength number, and light path exchange adopts two-way reservation mechanism, setting up and remove a passage needs the regular hour, thus light path exchange constantly increase and capricious the Internet traffic in be difficult to adapt to.
For optical packet switching technique, the light of usining in light signal aspect grouping realizes packet switching as minimum grouping particle, and bandwidth availability ratio is higher, is applicable to transmission bursty data.But optical packet switching technique also exists some defects, wherein distinct issues are to lack high-speed light logical device and optical cache memory.Therefore,, within the follow-up quite a long time, the application prospect of optical packet switching technique is also bad.
For OBS, the bandwidth granularity of its use is between light path exchange and light packet switching, independently on channel, transmitting control packet, the information of carrying by control packet, on the core node of process, be the reserved resource of burst packets, burst packets is passed through whole OBS network in light territory with the form leading directly to.Core node only need carry out O/E/O conversion and processing to control packet, has so just overcome the exchange bottleneck in optical circuit exchange, has improved bandwidth availability ratio, and has been easier to realize than light packet switching.
OBS network based on ring topology has simply, is easy to the feature realizing with respect to the OBS network of mesh topology, be specially adapted in metropolitan area network.Node in OBS looped network is called light burst add-drop multiplexer (OBADM), and as shown in Figure 1, Fig. 1 is existing OBS ring network schematic diagram.
In OBS looped network, N node is evenly distributed in ring, each node can connect one or more Access Network, the certain packing algorithm of OBS looped network node utilization is dressed up burst packets by the IP package from Access Network and is sent in looped network, and in the wavelength of the M in looped network, one as control channel, be used for transfer control grouping (BCP, BHPBurst Head Packet), all the other M-1 wavelength is used for transmitting packet (BDP, Burst DataPacket).
But, in the existing method that realizes OBADM, need to use a large amount of high-speed optical switches and channel join-splitting device, also need to use burst type tunable wave length optical transceiver module and burst type image intensifer, because current technical conditions are not mature enough, in fact now have difficulties, and with high costs, can not meet commercial demand.
Summary of the invention
Main purpose of the present invention is to provide a kind of method and device of realizing light burst add-drop multiplexer, the smooth expansion and the large-scale application that are intended to realize with low cost OBS looped network.
In order to achieve the above object, the present invention proposes a kind of method that realizes light burst add-drop multiplexer, comprising:
Light burst-switched OBS node receives the local service packet that user's side sends;
Described local service packet is carried out to the processing of OBS service convergence, obtain OBS type of service packet;
Described OBS type of service packet is carried out to electric light conversion, obtain burst packet;
By described burst packet and through optical coupler light-splitting processing Yi road light signal, by wavelength-selective switches, externally select to send.
Preferably, the method also comprises:
Burst control bag and burst packet that described OBS node sends by control packet BCP channel and other OBS nodes of packet BDP channel selective reception respectively;
According to described burst control bag, select the burst packet of respective wavelength;
Burst packet to the respective wavelength of selecting is carried out opto-electronic conversion;
Burst packet after opto-electronic conversion is carried out to OBS business solution convergence processing, export after being split as local service packet.
Preferably, the described step according to the burst packet of burst control bag selection respective wavelength comprises:
Described burst control bag is carried out to opto-electronic conversion;
In burst control bag from described opto-electronic conversion, parse control information wherein;
According to described control information, control the burst packet of high-speed optical switch selective reception respective wavelength.
Preferably, the described step of the burst packet of respective wavelength of selecting according to burst control bag also comprises before:
The burst control bag and the burst packet that other OBS nodes that receive are sent by image intensifer are carried out optical signal amplification processing.
Preferably, the described step of the burst packet of respective wavelength of selecting according to burst control bag also comprises before:
The burst control bag and the burst packet that other OBS nodes that receive are sent by described optical coupler are carried out light-splitting processing.
Preferably, the method also comprises:
When judging corresponding burst packet as transparent data bag according to described burst control bag, described transparent data bag is selected externally to send by wavelength-selective switches.
The present invention also proposes a kind of device of realizing light burst add-drop multiplexer, comprising:
Local service signal receiving module, the local service packet sending for receiving user's side;
OBS Service Processing Module, for described local service packet is carried out to the processing of OBS service convergence, obtains OBS type of service packet;
Electrooptic conversion module, for described OBS type of service packet is carried out to electric light conversion, obtains burst packet;
Sending module, for externally selecting described burst packet and optical coupler light-splitting processing Yi road light signal to send by wavelength-selective switches.
Preferably, this device also comprises:
OBS service signal receiver module, for burst control bag and the burst packet sending by BCP channel and BDP channel selective reception OBS node respectively;
Select module, for select the burst packet of respective wavelength according to described burst control bag;
Photoelectric conversion module, for carrying out opto-electronic conversion to the burst packet of the respective wavelength of selecting;
Described OBS Service Processing Module, also carries out OBS business solution convergence processing for the burst packet to after opto-electronic conversion, exports after being split as local service packet.
Preferably, described selection module comprises:
Converting unit, for carrying out opto-electronic conversion to described burst control bag;
Resolution unit, parses control information wherein for the burst control bag from described opto-electronic conversion;
Selected cell, for controlling the burst packet of high-speed optical switch selective reception respective wavelength according to described control information.
Preferably, this device also comprises:
Amplification module, carries out optical signal amplification processing for the burst control bag and the burst packet that other OBS nodes that receive are sent by image intensifer.
Preferably, this device also comprises:
Light-splitting processing module, carries out light-splitting processing for the burst control bag and the burst packet that other OBS nodes that receive are sent by described optical coupler.
Preferably, described sending module, also for when judging corresponding burst packet as transparent data bag according to described burst control bag, is selected described transparent data bag externally to send by wavelength-selective switches.
A kind of method and device of realizing light burst add-drop multiplexer that the present invention proposes, by using wavelength-selective switches, realize OBS node, when having solved traditional OBADM and realizing, need extensive high-speed optical switch array, burst type optical module and burst type optical amplifier technology is not mature enough or problem with high costs, under current technical conditions, can be relatively easy to set up fairly large OBS looped network, with low cost, realize the smooth dilation upgrade of OBS looped network, and the large-scale application of OBS.
Accompanying drawing explanation
Fig. 1 is existing OBS ring network schematic diagram;
Fig. 2 is the system framework schematic diagram the present invention relates to;
Fig. 3 is the functional block diagram of Service Processing Module in the system framework the present invention relates to;
Fig. 4 is the schematic flow sheet that the present invention realizes method one embodiment of light burst add-drop multiplexer;
Fig. 5 is the schematic flow sheet that the present invention realizes another embodiment of method of light burst add-drop multiplexer;
Fig. 6 is the method schematic flow sheet of an embodiment again that the present invention realizes light burst add-drop multiplexer;
Fig. 7 is the method OBADM business procession schematic diagram in an embodiment again that the present invention realizes light burst add-drop multiplexer;
Fig. 8 is method 4 OBS looped network schematic diagrames that OBS node forms in an embodiment again that the present invention realizes light burst add-drop multiplexer;
Fig. 9 be in the example shown in Fig. 8 OBS node 1 realize block diagram;
Figure 10 is method 3 OBS looped network schematic diagrames that OBS node forms in an embodiment again that the present invention realizes light burst add-drop multiplexer;
Figure 11 be in the example shown in Figure 10 OBS node 1 realize block diagram;
Figure 12 is the structural representation that the present invention realizes device one embodiment of light burst add-drop multiplexer;
Figure 13 is the structural representation that the present invention realizes another embodiment of device of light burst add-drop multiplexer;
Figure 14 is that the present invention realizes the structural representation of selecting module in another embodiment of device of light burst add-drop multiplexer;
Figure 15 is the device structural representation of an embodiment again that the present invention realizes light burst add-drop multiplexer.
In order to make the technical scheme of invention clearer, to understand, below in conjunction with accompanying drawing, be described in further detail.
Embodiment
The solution of the embodiment of the present invention is mainly: by using wavelength-selective switches and single high-speed optical switch to realize OBS node, when having solved traditional OBADM and realizing, need extensive high-speed optical switch array, burst type optical module and burst type optical amplifier technology is not mature enough or problem with high costs, under current technical conditions, can be relatively easy to set up fairly large OBS looped network, with low cost, realize the smooth dilation upgrade of OBS looped network, and the large-scale application of OBS.
As shown in Figure 2, system framework involved in the present invention comprises: image intensifer A, image intensifer B, lower business module _ light part, upper business module _ light part and Service Processing Module, wherein:
Image intensifer A, image intensifer B are for amplifying receiving the light of optical fiber from circuit and mailing to the light signal that circuit sends optical fiber respectively.
Lower business module _ light partly comprises optical coupler, wavelength separated device (specifically selecting wavelength-selective switches WSS_A), high speed 1xN optical switch, BCP receives optical module and BDP receives optical module.
Optical coupler is used for to circuit light signal along separate routes, and after being divided into two, a part of light signal is sent to wavelength-selective switches WSS_A and realizes lower road, and another part light signal is sent to the business module of setting out on a journey and participates in processing.
Wavelength-selective switches WSS_A selects lower road to wavelength X 1 to the λ n that comprises this underground road business and control wavelength X c.The present invention selects wavelength-selective switches and unconventional channel-splitting filter herein, its meaning is, channel-splitting filter is exported fixing n road wavelength to n path channels (optical fiber), because the connection of every optical fiber is fixed, if need to carry out the network capacity extension, attendant's on-the-spot plug optical fiber of having to reconfigures.Wavelength-selective switches can configure by software, selects which road wavelength to carry out lower dataway operation.When the network rebuilding, tend to the situation that occurs that wavelength is redistributed, if use common channel-splitting filter, more cannot be competent at; Wavelength-selective switches is easy to realize.
In Xia road service wavelength λ 1 to λ n, if wherein wavelength X i has comprised a burst packet BDP and need to descend road, high speed 1xN optical switch is under the control of OBS service convergence and control module, open in time high speed 1xN optical switch, allow the light signal of this burst packet BDP by after optical switch, then close optical switch.
It is broadband receiver that BDP receives optical module, can receive in optical link and comprise from any wavelength of λ 1 to λ n.
BCP receives optical module and is used for receiving wavelength X c, completes the opto-electronic conversion of the burst control bag of wavelength X c transmission.
Upper business module _ light partly comprises wavelength selector part (specifically selecting wavelength-selective switches WSS_B), BCP sends optical module and BDP sends optical module.
BDP sends optical module and has been used for the set out on a journey opto-electronic conversion of wavelength X j of local service, and for certain fixing OBS node, its wavelength is the fixed wave length that static allocation is good conventionally; And in the situation that network needs additions and deletions node, dynamically adjust the wavelength of setting out on a journey.
BCP sends optical module and has been used for the local opto-electronic conversion of controlling wavelength X c.
In the present invention, two of above-mentioned BDP and BCP send optical module and use common continous way laser sending module, do not need to use burst type optical module.
The selection of wavelength-selective switches WSS_B by different wave length realizes wavelength X c and local service the setting out on a journey of wavelength X j of setting out on a journey, that is: through in the numerous wavelength after optical coupler light-splitting processing, λ c and λ j are blocked, and other wavelength is straight-through; The control wavelength X c that local service is set out on a journey again and data wavelength X j are strobed and set out on a journey.The function of wavelength-selective switches WSS_B and WSS_A and model conventionally can be different.Wavelength selector part also can be used other scheme to realize, for example, use light blocking swtich isolation λ c and λ j, re-uses wave multiplexer the λ c setting out on a journey and λ j are merged.
Use the benefit of wavelength-selective switches WSS_B to be that implementation is succinct, two wavelength X c and λ j can set out on a journey successfully in disposable selection, do not need additionally to use multi-path light coupler.Because the wavelength-selective switches using can dynamically be realized the selection of multichannel wavelength, so this scheme is convenient to the network capacity extension, only by software, configures and can realize smooth upgrade.
Service Processing Module has been realized in fact the function of OBS MAC, that is: the signal type correspondence of local service part the traditional business types such as PTN, Ethernet or IP bag, the signal type after processing through Service Processing Module correspondence OBS layer.
Service Processing Module comprises OBS service convergence and control module and local service emission and reception module, wherein: local service emission and reception module completes the opto-electronic conversion of local upper and lower business; After OBS service convergence and control module are classified local service, converge, dispatch, produce burst control bag BCP and burst packet BDP, mail to BCP channel and BDP channel; Control information according to comprising the burst control bag BCP receiving from BCP channel, opens and closes high speed 1xN optical switch in time, and from a plurality of BDP channels, selective reception is at the burst packet BDP on this underground road.The functional block diagram of this Service Processing Module as shown in Figure 3.
Each node in OBS looped network, embodiment of the present invention both can realize the process of setting out on a journey of OBS node local data, specifically can realize the fixedly transmission of local service data, can realize again local data under pass by journey, specifically can realize the selective reception of local data.
Particularly, as shown in Figure 4, one embodiment of the invention proposes a kind of method that realizes light burst add-drop multiplexer, can realize the process of setting out on a journey of local data, and the selection that specifically can realize local data sends, and the method can comprise:
Step S105, OBS node receives the local service packet that user's side sends;
Step S106, carries out the processing of OBS service convergence to described local service packet, obtains OBS type of service packet;
Step S107, carries out electric light conversion to described OBS type of service packet, obtains burst packet.
Business data packet (IP or Ethernet bag) is set out on a journey by local service emission and reception module in this locality, enter OBS service convergence and control module, according to destination address, QOS(Quality Of Service) information such as, be categorized into different data flow, after scheduler module scheduling, every data flow adopt suitable converge algorithm (such as fixing binding time with converge Length algorithm MSMAP – Max Burst-size Max Assembly Period), produce burst packet BDP and its corresponding burst control bag BCP, under the control of control protocol (such as token polling or random polling algorithm), avoid as far as possible or reduce the conflict of receiver, then through BCP transmission optical module and BDP transmission optical module, send on circuit.
BCP and BDP send optical module and realize respectively electric light conversion (E-->O) afterwards, and the wavelength of the data channel of setting out on a journey carrying is λ j, and control channel carrying wavelength is λ c, and two wavelength of setting out on a journey are directly sent to wavelength-selective switches WSS_B.
Wavelength-selective switches WSS_B will select from the λ j of local service and λ c, and other wavelength of simultaneously optical coupler being sent here are straight-through, are then sent to image intensifer B(OBA).
Image intensifer OBA will be sent to next OBS node after the optical signal amplification of sending into.
In the present embodiment, OBADM business procession as shown in Figure 7.
The present embodiment is being realized the process of setting out on a journey of OBS node local data by use wavelength-selective switches, the selection that specifically can realize local data sends, when having solved traditional OBADM and realizing, need extensive high-speed optical switch array, burst type optical module and burst type optical amplifier technology is not mature enough or problem with high costs, with low cost, realize the smooth dilation upgrade of OBS looped network, and the large-scale application of OBS.
As shown in Figure 5, another embodiment of the present invention proposes a kind of method that realizes light burst add-drop multiplexer, can realize local data under pass by journey, specifically can realize the selective reception of local data, the method can comprise:
Step S101, burst control bag and burst packet that OBS node sends by BCP channel and other OBS nodes of BDP channel selective reception respectively;
Local OBS node receives by the BCP channel of transmission wavelength λ c the burst control bag that other OBS nodes send, and receives the burst packet of other OBS nodes transmissions by the corresponding BDP channel of transmission wavelength λ 1 to λ n.
Local OBS node, to each wavelength X 1 to λ n that is configured in road under this node receiving and the light signal of control information wavelength X c, is selected lower road by wavelength-selective switches WSS_A.
Step S102, according to the burst packet of described burst control bag selection respective wavelength;
Under getting by wavelength-selective switches WSS_A selection, each wavelength X 1 on road arrives after the light signal of λ n and control information wavelength X c, first be that burst control bag BCP to comprising each wavelength of lower road processes, by BCP, receive optical module burst control bag is carried out to opto-electronic conversion, and parse control information wherein in the burst control bag from opto-electronic conversion, then according to this control information, control the burst packet of high-speed optical switch selective reception respective wavelength.
Particularly, under the control of control protocol, in arbitrary moment, only have the burst packet BDP that a wavelength comprises to select lower road by high speed 1xN optical switch.This wavelength may often change, control module sending control signal in Service Processing Module, the control of realization to high speed 1xN optical switch, the moment that the BDP on Yao Xia road arrives, control signal is opened high speed 1xN optical switch, selects the burst packet of respective wavelength to send into BDP reception optical module.
After this burst packet BDP passes through, by control module, control and close optical switch, wait for that other arrives the arrival of the burst packet BDP of this node.
Step S103, carries out opto-electronic conversion to the burst packet of the respective wavelength of selecting;
By BDP, receive optical module the burst packet of the respective wavelength of high speed 1xN optical switch gating is carried out to opto-electronic conversion.
Step S104, carries out OBS business solution convergence processing to the burst packet after opto-electronic conversion, exports after being split as local service packet.
The burst packet of the respective wavelength of process high speed 1xN optical switch, by BDP, receive after optical module, through the OBS service convergence in Service Processing Module, separate convergence processing, burst packet BDP is split into after local service packet (IP bag or Ethernet bag etc.), by local service emission and reception module, carry out the output of lower road.
The present embodiment is by being used wavelength-selective switches and single high-speed optical switch to realize OBS node, when having solved traditional OBADM and realizing, need extensive high-speed optical switch array, burst type optical module and burst type optical amplifier technology is not mature enough or problem with high costs, under current technical conditions, can be relatively easy to set up fairly large OBS looped network, with low cost, realize the smooth dilation upgrade of OBS looped network, and the large-scale application of OBS.
As shown in Figure 6, yet another embodiment of the invention proposes a kind of method that realizes light burst add-drop multiplexer, on the basis of above-described embodiment, before above-mentioned steps S102, also comprises:
Step S90, the burst control bag and the burst packet that other OBS nodes that receive are sent by image intensifer are carried out optical signal amplification processing.
Step S100, the burst control bag and the burst packet that other OBS nodes that receive are sent by optical coupler are carried out light-splitting processing.
Before above-mentioned steps S100, also comprise:
Step S105, described OBS node receives the local service packet that user's side sends;
Step S106, carries out the processing of OBS service convergence to described local service packet, obtains OBS type of service packet;
Step S107, carries out electric light conversion to described OBS type of service packet, obtains burst packet;
After above-mentioned steps S100, also comprise:
Step S108, externally selects the burst packet and the described optical coupler light-splitting processing Yi road light signal that carry out electric light conversion to send by wavelength-selective switches.
The difference of the present embodiment and above-described embodiment is, the burst control bag and the burst packet that in the present embodiment, also by image intensifer, other OBS nodes that receive are sent are carried out optical signal amplification processing, the burst control bag and the burst packet that other OBS nodes that receive are sent by optical coupler are carried out light-splitting processing, can realize the process of setting out on a journey of OBS node local data simultaneously.
Particularly, for passing by journey under local OBS node data:
First the line activities of sending here from the previous OBS node of local OBS node passes through image intensifer A(OPA) amplify, to guarantee appropriate luminous power, be then sent to optical coupler and carry out light-splitting processing.
After the light-splitting processing that optical coupler is divided into two, will be wherein a road light signal send into lower business module _ light and partly carry out lower Business Processing, an other road light signal is sent to wavelength-selective switches WSS_B and this ground service wavelength selects to close road.
In lower business module _ light part, under getting by wavelength-selective switches WSS_A selection, each wavelength X 1 on road arrives after the light signal of λ n and control information wavelength X c, first be that burst control bag BCP to comprising each wavelength of lower road processes, by BCP, receive optical module burst control bag is carried out to opto-electronic conversion, and parse control information wherein in the burst control bag from opto-electronic conversion, then according to this control information, control the burst packet of high-speed optical switch selective reception respective wavelength.
Particularly, under the control of control protocol, in arbitrary moment, only have the burst packet BDP that a wavelength comprises to select lower road by high speed 1xN optical switch.This wavelength may often change, control module sending control signal in Service Processing Module, the control of realization to high speed 1xN optical switch, the moment that the BDP on Yao Xia road arrives, control signal is opened high speed 1xN optical switch, selects the burst packet of respective wavelength to send into BDP reception optical module.
After this burst packet BDP passes through, by control module, control and close optical switch, wait for that other arrives the arrival of the burst packet BDP of this node.
Afterwards, by BDP, receive optical module the burst packet of the respective wavelength of high speed 1xN optical switch gating is carried out to opto-electronic conversion, through the OBS service convergence in Service Processing Module, separate convergence processing, burst packet BDP is split into after local service packet (IP bag or Ethernet bag etc.), by local service emission and reception module, carry out the output of lower road.
The process of setting out on a journey for OBS node local data:
Business data packet (IP or Ethernet bag) is set out on a journey by local service emission and reception module in this locality, enter OBS service convergence and control module, according to destination address, QOS(Quality Of Service) information such as, be categorized into different data flow, after scheduler module scheduling, every data flow adopt suitable converge algorithm (such as fixing binding time with converge Length algorithm MSMAP – Max Burst-size Max Assembly Period), produce burst packet BDP and its corresponding burst control bag BCP, under the control of control protocol (such as token polling or random polling algorithm), avoid as far as possible or reduce the conflict of receiver, then through BCP transmission optical module and BDP transmission optical module, send on circuit.
BCP and BDP send optical module and realize respectively electric light conversion (E-->O) afterwards, and the wavelength of the data channel of setting out on a journey carrying is λ j, and control channel carrying wavelength is λ c, and two wavelength of setting out on a journey are directly sent to wavelength-selective switches WSS_B.
Wavelength-selective switches WSS_B will select from the λ j of local service and λ c, and other wavelength of simultaneously optical coupler being sent here are straight-through, are then sent to image intensifer B(OBA).
Image intensifer OBA will be sent to next OBS node after the optical signal amplification of sending into.
In the present embodiment, OBADM business procession as shown in Figure 7.
With instantiation, the scheme of the present embodiment is described in detail below.
As shown in Figure 8, Fig. 8 is the OBS looped network that 4 OBS nodes form, and its concrete handling process is:
Optical link comprises 5 wavelength X c and λ 1 to λ 4 altogether: wherein λ c is BCP channel, for 4 node transmitting-receiving burst control bag BCP; λ 1 is the BDP transmitting channel of node 1, and λ 2 is the BDP transmitting channel of node 2, and λ 3 is the BDP transmitting channel of node 3, and λ 4 is the BDP transmitting channel of node 4.
On OBS looped network, three nodes of each node and other have business intercommunication.At this, the OBS node 1 of take is described the business procession of each node as example, and other node and node 1 are similar.OBS node 1 realize block diagram as shown in Figure 9.
Particularly, the business of node 1 by wavelength X 1 broadcast transmission oneself to other 3 nodes on OBS looped network (because set out on a journey by wavelength-selective switches WSS_B, so the wavelength X 1 on circuit is turn-offed by the optical switch of wavelength-selective switches inside originally, avoid business Cheng Huan and conflict), and the wavelength X 2 sending separately from other three nodes, λ 3, the business of oneself is issued in λ 4 selective receptions, for fear of receiving conflict, can adopt token polling control protocol: it is also a kind of burst control bag that node 1 sends a token A(by BCP channel), in other 3 nodes, the node that receives token A can be to node 1 transmission business, other node that does not receive token A can not be to node 1 transmission business.Receive the node of token A after sending business, discharge token A to OBS looped network, the node that the next one receives token A continues to node 1 transmission business.The reception conflict that can avoid like this node 1 to cause when receiving the business that other 3 nodes send.
Node 1 receives by control channel λ c the burst control bag BCP that other node sends, judge whether the burst packet on BDP channel lambda 2, λ 3, λ 4 issues oneself, if issue oneself, open high speed 1xN optical switch and select corresponding wavelength, after this burst control bag BDP finishes receiving, closing high-speed 1xN optical switch; If the burst packet BDP that BDP channel lambda 2, λ 3, λ 4 arrive does not issue this node, node 1 upgrades after the corresponding control information of the burst control bag BCP receiving, this burst control bag BCP is mail on circuit by λ c, when this burst packet BDP arrives, need not open high speed 1xN optical switch.
The processing procedure of other node is similar.
As shown in figure 10, Figure 10 is the OBS looped network that 3 OBS nodes form, and it realizes block diagram as shown in figure 11.
Compare the OBS looped network that 4 OBS nodes form, the high-speed optical switch under this kind of scene or the optical switch of 1X4, but input selection wavelength now only has 3.All node courses of work are still normally carried out as previously mentioned.
If carry out dilatation on the basis of the OBS looped network forming at 3 OBS nodes, the dilatation of take is example to the situation of 4 nodes, its operation can be very simple: add after the 4th node, by network management system, reconfigure each node, specific implementation reconfigures high-speed optical switch and wavelength-selective switches, and front 3 existing nodes do not need more exchange device can realize smooth upgrade.
It should be noted that, when judging corresponding burst packet as transparent data bag according to burst control bag, described transparent data bag is selected externally to send by wavelength-selective switches WSS_B.
As shown in figure 12, one embodiment of the invention proposes a kind of device of realizing light burst add-drop multiplexer, this Plant arrangement is in an OBS node of OBS looped network, this device comprises: local service signal receiving module 70, OBS Service Processing Module 40, electrooptic conversion module 80 and sending module 90, wherein:
Local service signal receiving module 70, the local service packet sending for receiving user's side;
Service Processing Module in OBS Service Processing Module 40(corresponding diagram 2), for described local service packet is carried out to the processing of OBS service convergence, obtain OBS type of service packet;
BDP in electrooptic conversion module 80(corresponding diagram 2 sends optical module and BCP sends optical module), for described OBS type of service packet is carried out to electric light conversion, obtain burst packet;
Sending module 90, for externally selecting described burst packet and optical coupler light-splitting processing Yi road light signal to send by wavelength-selective switches.
Shown in Fig. 2, this locality business data packet (IP or Ethernet bag) of setting out on a journey enters OBS Service Processing Module 40 by local service signal receiving module 70, by local service emission and reception module, enter OBS service convergence and control module, according to destination address, QOS(Quality Of Service) information such as, be categorized into different data flow, after scheduler module scheduling, every data flow adopt suitable converge algorithm (such as fixing binding time with converge Length algorithm MSMAP – Max Burst-size Max Assembly Period), produce burst packet BDP and its corresponding burst control bag BCP, under the control of control protocol (such as token polling or random polling algorithm), avoid as far as possible or reduce the conflict of receiver, then through BCP transmission optical module and BDP transmission optical module, send on circuit.
BCP and BDP send optical module and realize respectively electric light conversion (E-->O) afterwards, and the wavelength of the data channel of setting out on a journey carrying is λ j, and control channel carrying wavelength is λ c, and two wavelength of setting out on a journey are directly sent to wavelength-selective switches WSS_B.
Wavelength-selective switches WSS_B will select from the λ j of local service and λ c, and other wavelength of simultaneously optical coupler being sent here are straight-through, are then sent to image intensifer B(OBA).
Image intensifer OBA will be sent to next OBS node after the optical signal amplification of sending into.
In the present embodiment, OBADM business procession as shown in Figure 7.
The present embodiment is being realized the process of setting out on a journey of OBS node local data by use wavelength-selective switches, the selection that specifically can realize local data sends, when having solved traditional OBADM and realizing, need extensive high-speed optical switch array, burst type optical module and burst type optical amplifier technology is not mature enough or problem with high costs, with low cost, realize the smooth dilation upgrade of OBS looped network, and the large-scale application of OBS.
As shown in figure 13, another embodiment of the present invention proposes a kind of device of realizing light burst add-drop multiplexer, this Plant arrangement is in an OBS node of OBS looped network, this device comprises: OBS service signal receiver module 10, selection module 20, photoelectric conversion module 30 and OBS Service Processing Module 40, wherein:
OBS service signal receiver module 10, for burst control bag and the burst packet sending by BCP channel and BDP channel selective reception OBS node respectively;
OBS Service Processing Module 40, carries out OBS business solution convergence processing for the burst packet to after opto-electronic conversion, exports after being split as local service packet.
Shown in Fig. 2 and Fig. 3, the OBS service signal receiver module 10 of local OBS node receives by the BCP channel of transmission wavelength λ c the burst control bag that other OBS nodes send, and receives the burst packet of other OBS nodes transmissions by the corresponding BDP channel of transmission wavelength λ 1 to λ n.
Afterwards, local OBS node, to each wavelength X 1 to λ n that is configured in road under this node receiving and the light signal of control information wavelength X c, is selected lower road by wavelength-selective switches WSS_A.
Under getting by wavelength-selective switches WSS_A selection, each wavelength X 1 on road arrives after the light signal of λ n and control information wavelength X c, first by the burst control bag BCP that selects 20 pairs of modules to comprise each wavelength of lower road, processed, by BCP, receive optical module burst control bag is carried out to opto-electronic conversion, and parse control information wherein in the burst control bag from opto-electronic conversion, then according to this control information, control the burst packet of high-speed optical switch selective reception respective wavelength.
Particularly, under the control of control protocol, in arbitrary moment, only have the burst packet BDP that a wavelength comprises to select lower road by high speed 1xN optical switch.This wavelength may often change, control module sending control signal in OBS Service Processing Module 40, the control of realization to high speed 1xN optical switch, the moment that the BDP on Yao Xia road arrives, control signal is opened high speed 1xN optical switch, selects the burst packet of respective wavelength to send into BDP reception optical module.
After this burst packet BDP passes through, by control module, control and close optical switch, wait for that other arrives the arrival of the burst packet BDP of this node.
Afterwards, OBS Service Processing Module 40 receives optical module by BDP the burst packet of the respective wavelength of high speed 1xN optical switch gating is carried out to opto-electronic conversion.
The burst packet of the respective wavelength of process high speed 1xN optical switch, by BDP, receive after optical module, through OBS service convergence, separate convergence processing, burst packet BDP is split into after local service packet (IP bag or Ethernet bag etc.), by local service emission and reception module, carry out the output of lower road.
Particularly, as shown in figure 14, above-mentioned selection module 20 comprises: converting unit 201, resolution unit 202 and selected cell 203, wherein:
Converting unit 201, for carrying out opto-electronic conversion to described burst control bag;
The present embodiment is by being used wavelength-selective switches and single high-speed optical switch to realize OBS node, when having solved traditional OBADM and realizing, need extensive high-speed optical switch array, burst type optical module and burst type optical amplifier technology is not mature enough or problem with high costs, under current technical conditions, can be relatively easy to set up fairly large OBS looped network, with low cost, realize the smooth dilation upgrade of OBS looped network, and the large-scale application of OBS.
As shown in figure 15, yet another embodiment of the invention proposes a kind of device of realizing light burst add-drop multiplexer, on the basis of above-described embodiment, also comprise: amplification module 50, light-splitting processing module 60, local service signal receiving module 70, electrooptic conversion module 80 and sending module 90, wherein:
Light-splitting processing module 60, carries out light-splitting processing for the burst control bag and the burst packet that other OBS nodes that receive are sent by optical coupler.
Local service signal receiving module 70, electrooptic conversion module 80 and sending module 90, wherein:
Described local service signal receiving module 70, the local service packet sending for receiving user's side;
Described OBS Service Processing Module 40, also, for described local service packet is carried out to the processing of OBS service convergence, obtains OBS type of service packet;
Described electrooptic conversion module 80, carries out electric light conversion to described OBS type of service packet, obtains burst packet;
Described transmission mould 90, for externally selecting described burst packet and described optical coupler light-splitting processing Yi road light signal to send by wavelength-selective switches.
The difference of the present embodiment and above-described embodiment is, the burst control bag and the burst packet that in the present embodiment, also by image intensifer, other OBS nodes that receive are sent are carried out optical signal amplification processing, the burst control bag and the burst packet that other OBS nodes that receive are sent by optical coupler are carried out light-splitting processing, can realize the process of setting out on a journey of OBS node local data simultaneously.
Particularly, for passing by journey under local OBS node data:
First the line activities of sending here from the previous OBS node of local OBS node passes through image intensifer A(OPA) amplify, to guarantee appropriate luminous power, be then sent to optical coupler and carry out light-splitting processing.
After the light-splitting processing that optical coupler is divided into two, will be wherein a road light signal send into lower business module _ light and partly carry out lower Business Processing, an other road light signal is sent to wavelength-selective switches WSS_B and this ground service wavelength selects to close road.
In lower business module _ light part, under getting by wavelength-selective switches WSS_A selection, each wavelength X 1 on road arrives after the light signal of λ n and control information wavelength X c, first be that burst control bag BCP to comprising each wavelength of lower road processes, by BCP, receive optical module burst control bag is carried out to opto-electronic conversion, and parse control information wherein in the burst control bag from opto-electronic conversion, then according to this control information, control the burst packet of high-speed optical switch selective reception respective wavelength.
Particularly, under the control of control protocol, in arbitrary moment, only have the burst packet BDP that a wavelength comprises to select lower road by high speed 1xN optical switch.This wavelength may often change, control module sending control signal in Service Processing Module, the control of realization to high speed 1xN optical switch, the moment that the BDP on Yao Xia road arrives, control signal is opened high speed 1xN optical switch, selects the burst packet of respective wavelength to send into BDP reception optical module.
After this burst packet BDP passes through, by control module, control and close optical switch, wait for that other arrives the arrival of the burst packet BDP of this node.
Afterwards, by BDP, receive optical module the burst packet of the respective wavelength of high speed 1xN optical switch gating is carried out to opto-electronic conversion, through the OBS service convergence in Service Processing Module, separate convergence processing, burst packet BDP is split into after local service packet (IP bag or Ethernet bag etc.), by local service emission and reception module, carry out the output of lower road.
The process of setting out on a journey for OBS node local data:
Business data packet (IP or Ethernet bag) is set out on a journey by local service emission and reception module in this locality, enter OBS service convergence and control module, according to destination address, QOS(Quality Of Service) information such as, be categorized into different data flow, after scheduler module scheduling, every data flow adopt suitable converge algorithm (such as fixing binding time with converge Length algorithm MSMAP – Max Burst-size Max Assembly Period), produce burst packet BDP and its corresponding burst control bag BCP, under the control of control protocol (such as token polling or random polling algorithm), avoid as far as possible or reduce the conflict of receiver, then through BCP transmission optical module and BDP transmission optical module, send on circuit.
BCP and BDP send optical module and realize respectively electric light conversion (E-->O) afterwards, and the wavelength of the data channel of setting out on a journey carrying is λ j, and control channel carrying wavelength is λ c, and two wavelength of setting out on a journey are directly sent to wavelength-selective switches WSS_B.
Wavelength-selective switches WSS_B will select from the λ j of local service and λ c, and other wavelength of simultaneously optical coupler being sent here are straight-through, are then sent to image intensifer B(OBA).
Image intensifer OBA will be sent to next OBS node after the optical signal amplification of sending into.
The instantiation of the present embodiment please refer to Fig. 8 in above-described embodiment, Fig. 9, Figure 10, Figure 11 and sets forth accordingly, does not repeat them here.
Further, described sending module 90, also for when judging corresponding burst packet as transparent data bag according to described burst control bag, is selected described transparent data bag externally to send by wavelength-selective switches.
The embodiment of the present invention realizes method and the device of light burst add-drop multiplexer, by using wavelength-selective switches and single high-speed optical switch, realize OBS node, when having solved traditional OBADM and realizing, need extensive high-speed optical switch array, burst type optical module and burst type optical amplifier technology is not mature enough or problem with high costs, under current technical conditions, can be relatively easy to set up fairly large OBS looped network, with low cost, realize the smooth dilation upgrade of OBS looped network, and the large-scale application of OBS.
The foregoing is only the preferred embodiments of the present invention; not thereby limit the scope of the claims of the present invention; every equivalent structure or flow process conversion that utilizes specification of the present invention and accompanying drawing content to do; or be directly or indirectly used in other relevant technical field, be all in like manner included in scope of patent protection of the present invention.
Claims (12)
1. a method that realizes light burst add-drop multiplexer, is characterized in that, comprising:
Light burst-switched OBS node receives the local service packet that user's side sends;
Described local service packet is carried out to the processing of OBS service convergence, obtain OBS type of service packet;
Described OBS type of service packet is carried out to electric light conversion, obtain burst packet;
By described burst packet and through optical coupler light-splitting processing Yi road light signal, by wavelength-selective switches, externally select to send.
2. method according to claim 1, is characterized in that, also comprises:
Burst control bag and burst packet that described OBS node sends by control packet BCP channel and other OBS nodes of packet BDP channel selective reception respectively;
According to described burst control bag, select the burst packet of respective wavelength;
Burst packet to the respective wavelength of selecting is carried out opto-electronic conversion;
Burst packet after opto-electronic conversion is carried out to OBS business solution convergence processing, export after being split as local service packet.
3. method according to claim 1, is characterized in that, the described step according to the burst packet of burst control bag selection respective wavelength comprises:
Described burst control bag is carried out to opto-electronic conversion;
In burst control bag from described opto-electronic conversion, parse control information wherein;
According to described control information, control the burst packet of high-speed optical switch selective reception respective wavelength.
4. method according to claim 1, is characterized in that, the described step of the burst packet of respective wavelength of selecting according to burst control bag also comprises before:
The burst control bag and the burst packet that other OBS nodes that receive are sent by image intensifer are carried out optical signal amplification processing.
5. according to the method in claim 2 or 3, it is characterized in that, the described step of the burst packet of respective wavelength of selecting according to burst control bag also comprises before:
The burst control bag and the burst packet that other OBS nodes that receive are sent by described optical coupler are carried out light-splitting processing.
6. method according to claim 5, is characterized in that, also comprises:
When judging corresponding burst packet as transparent data bag according to described burst control bag, described transparent data bag is selected externally to send by wavelength-selective switches.
7. a device of realizing light burst add-drop multiplexer, is characterized in that, comprising:
Local service signal receiving module, the local service packet sending for receiving user's side;
OBS Service Processing Module, for described local service packet is carried out to the processing of OBS service convergence, obtains OBS type of service packet;
Electrooptic conversion module, for described OBS type of service packet is carried out to electric light conversion, obtains burst packet;
Sending module, for externally selecting described burst packet and optical coupler light-splitting processing Yi road light signal to send by wavelength-selective switches.
8. device according to claim 7, is characterized in that, also comprises:
OBS service signal receiver module, for burst control bag and the burst packet sending by BCP channel and BDP channel selective reception OBS node respectively;
Select module, for select the burst packet of respective wavelength according to described burst control bag;
Photoelectric conversion module, for carrying out opto-electronic conversion to the burst packet of the respective wavelength of selecting;
Described OBS Service Processing Module, also carries out OBS business solution convergence processing for the burst packet to after opto-electronic conversion, exports after being split as local service packet.
9. device according to claim 8, is characterized in that, described selection module comprises:
Converting unit, for carrying out opto-electronic conversion to described burst control bag;
Resolution unit, parses control information wherein for the burst control bag from described opto-electronic conversion;
Selected cell, for controlling the burst packet of high-speed optical switch selective reception respective wavelength according to described control information.
10. device according to claim 8, is characterized in that, also comprises:
Amplification module, carries out optical signal amplification processing for the burst control bag and the burst packet that other OBS nodes that receive are sent by image intensifer.
Device described in 11. according to Claim 8,9 or 10, is characterized in that, also comprises:
Light-splitting processing module, carries out light-splitting processing for the burst control bag and the burst packet that other OBS nodes that receive are sent by described optical coupler.
12. devices according to claim 11, is characterized in that, described sending module, also for when judging corresponding burst packet as transparent data bag according to described burst control bag, is selected described transparent data bag externally to send by wavelength-selective switches.
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