CN100349470C - Elastic optical group exchanging method and node equipment based on dicyclic all-optical buffer storage - Google Patents
Elastic optical group exchanging method and node equipment based on dicyclic all-optical buffer storage Download PDFInfo
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Abstract
The present invention relates to an elastic optical group switching method and a node device based on a dual ring all-optical buffer storage. A packet switching method and a device of an all-optical buffer storage of which the buffering time can be adjusted are used in an elastic packet ring net. A frame structure of which the frame head speed and the net load speed are unequal is adopted. Not all the whole optical data frame from a ring is implemented with optical /electric /optical conversion, but only the frame head is carried out. Routing information can be obtained, and the net load in the data frame is buffered by the all-optical buffer storage. Whether the frame is routed from the node or forwarded to the down stream of the ring net can be determined according to the routing information of the frame head. When the forwarded data has competition with the data sent from the node to the ring net, the dual ring all-optical buffer storage of which the read-write can be controlled is used. The buffering time can be adjusted by control algorithm, and the competition can be overcome. The node device can overcome the bottleneck of all optical data flows needing optical /electric /optical conversion, reduce switching granularity, reduce obstruction happening probability, and enhance bandwidth utilization.
Description
Technical field
The present invention relates to a kind of light grouping exchange method and node apparatus of all-optical communication network, especially adopt a kind of switching method and the node apparatus of elastic packet loop network of the full light packet switching of all-optical buffer technology.
Background technology
The all optical network that is exchanged for core with light can solve the electronics speed bottleneck problem of exchange, thereby is subjected to common attention.In recent years the wavelength exchange all optical network that occurs is to be the exchanged form of exchange granularity with the wavelength, belongs to the simulation exchange in essence, and bandwidth availability ratio is not high, and the exchange granularity is too big, and the exchange resource wavelength is limited, has problems such as competition and obstruction.For this reason, a kind of new full light switching technology has been proposed in recent years---full light packet switch OPS:Optical Packet Switching, the article All-optical packet switching forMAN:Opportunities and Challengess of people in the IEEE communications of 2001 phases of March magazine magazine such as Sun Yao, the article The perspective of optical packet switching in IP dominat backbone and MANs of people in the IEEE communicationsmagazine of 2001 phases of March magazine such as Amaury Jourdan, among the article The application ofoptical packet switching in future communication Networks of people in the IEEE communications of 2001 phases of March magazine magazine such as MikeJ.O ' Mahony this there is detailed introduction.
RPR network RPR is the international project Shi Xiehui ieee standardization stage speeds such as a kind of many that are organized in the 802.17 project team definition of setting up on December 7th, 2000, has the protection switch function and go into agreement based on the articulating of transmitted in packets, is one of important form of metropolitan area network.To this, the website
Http:// www.ieee802.org/17.On detailed introduction is arranged.RPR adopts the medium access control MAC protocol of inserting the optimization of ring based on buffer, the burst flow that enters ring is carried out level and smooth and balanced, and support space is reused the utilance of raising link bandwidth.To this, detailed introduction is arranged on the www.rpralliance.org of website.
Existing RPR node structure is based on electric buffer.Come from the necessary process earlier of the light Frame opto-electronic conversion that network arrives node, just can enter buffer memory in the electric buffer then.Detailed process is: will send into control unit through the frame head information of opto-electronic conversion earlier, according to the routing iinformation of frame head, control unit makes the Frame that receives or enters reception buffer, perhaps enters the forwarding cache device.Simultaneously, the Frame that set out on a journey, it is medium to be sent also to be introduced into the transmit buffer of setting out on a journey in advance.Enter the Frame of reception buffer, under the control of control unit, further finish the work on road down.And enter the Frame of forwarding cache device, at this moment the Frame of might and set out on a journey clash.Therefore, be the Frame that sends in the forwarding cache device on earth, still send the Frame in the transmit buffer of setting out on a journey, determine according to certain dispatching principle and algorithm by control unit, and utilize rational algorithm to eliminate the competition of the two as much as possible.So, on function, node based on the RPR of electric buffer roughly comprises 6 functional modules, be respectively: receiving data frames buffer memory and frame head information reading module, down the Frame road and that pass node diverter module, down the road the Frame receiver module, pass the buffer memory and the forwarding module of the Frame of node, the Frame buffer memory and the sending module of setting out on a journey, and control module.
Wherein receiving data frames buffer memory and frame head information reading module are finished opto-electronic conversion, and frame head information reads and the Frame after the process opto-electronic conversion that receives is carried out preliminary buffer memory.The Frame that the diverter module with the Frame that passes node on following road is finished descending the road separates with the Frame that will transmit, although isolation technics can adopt the mode of data/address bus, make Frame arrive different buffers by the read-write control line that changes buffer with address wire, but be the same the effectiveness that different Frames is distributed to different buffers.The Frame receiver module on following road is road under the Frame output that further will enter in the reception buffer.Pass the buffer memory and the forwarding module of the Frame of node and realize buffer memory and the transmission of Frame in the forwarding cache device; Frame buffer memory of setting out on a journey and sending module realize setting out on a journey buffer memory and the transmission of Frame in transmit buffer.Control module is analyzed the routing iinformation in the various Frame frame heads, realizes control to each module of front according to certain dispatching principle and algorithm, avoids conflict and competes.Because the information processing in the whole node, buffer memory, separation and synthetic all be in electric territory, to carry out, so inevitably also will carry out one time electro-optical conversion at the output of node.
From top analysis as can be seen, present RPR based on electric buffer, when Frame arrives the last node of ring, all all Frames to be carried out light-electricity-light conversion, the flank speed of photoelectric transformer is exactly the flank speed of Frame work, has limited the further raising of link rate.The lot of data frame only is from this node process, does not descend the road, and it is unnecessary carrying out light-electricity-light conversion.But, still have to carry out a large amount of photoelectricity, electric light conversion work in electric territory because buffer memory, separation, a series of processes such as synthetic all are to finish.Because the transformation rate of photoelectricity, electro-optical device is subjected to the restriction of electronic bottleneck, causes exchange rate to be difficult to further raising.Node on the ring is many more, and this insignificant conversion is frequent more, limits serious further.
Although the proposition of full light packet technology has time, the application in metropolitan area network does not appear in the newspapers, and lets alone in RPR.If use full light packet technology in RPR, the all-optical buffer problem of net load and the scheduling problem of full optical buffer are the matters of utmost importance that must solve.In the node device of elasticity light grouping ring, the usage quantity of buffer is few, what have is fixed delay substantially, can use cheap fibre delay line full optical buffer, in fact, only need be used to manage conflict such as the buffer of the conflict of the Frame of transmitting and setting out on a journey, because will dispatch to message for those, be uncertain its memory time, and the buffer of needs use read-write real meaning controlled, that deposit in and read at random at random.
Transmission rate is high more, and the capacity of Network Transmission information is big more.In fact, the amount of information that comprises in the frame head does not have great raising because of the increase of network transmission speed, but owing to reasons such as Clock Extraction, Frame identifications, frame head occupies relatively-stationary length in Frame, so, can reduce fully frame head transmission rate, use the photoactor of low photoelectricity transformation rate to extract frame head information.Can use the photoactor lower in other words, avoid the light-to-current inversion bottleneck than the transmission rate of network link.But under the situation of all Frames being carried out light-electricity-light conversion, the rate requirement that reduces the frame head photoactor does not have practical significance separately.
Summary of the invention
Whole light Frames need be carried out the restricted problem of photoelectricity, electric light conversion in order to overcome to the Resilient Packet Ring throughput based on the Resilient Packet Ring of electric buffer, and be easy to compete and problem such as obstruction, the present invention utilizes number of patent application: 02153429.2, and denomination of invention: the patented technology of " double-ring coupled full optical buffer "---a kind of method and node apparatus of the elasticity light packet switching based on the dicyclo full optical buffer are proposed.This method has adopted the light data frame structure that frame head speed is relatively slow, net load is fast relatively, the light Frame that arrives node is treated with a certain discrimination, only frame head is carried out light-to-current inversion, the light Frame of transmitting for needs does not carry out light-electricity-light conversion but full light packet switch; Set out on a journey and work in mode multiplexing, demultiplexing during following road at Frame; Node apparatus uses read-write controllable dicyclo full optical buffer solution competition and blocks, and reduces exchange granularity, raising exchange efficiency thereby reach, and more effectively solves competition, reduces the purpose of blocking probability of happening.
The technical scheme that problem adopted that the present invention solves the method for existing elasticity packet switching based on electric buffer and node apparatus is as follows.
Method based on the elasticity light packet switching of dicyclo full optical buffer:
In RPR, employing frame head speed is relatively slow, net load is fast relatively, the light data frame structure of regular length.When from elastic packet loop network input light Frame, node is the frame head relatively slow to speed only, rather than whole Frame is carried out opto-electronic conversion, reduces the rate requirement of opto-electronic conversion, and obtains the routing iinformation of frame head.Come the comparatively faster net load of speed in the light Frame of node directly with the form of light signal, enter the fibre delay line full optical buffer and carry out buffer memory, improve the transparency of exchange.According to the routing iinformation in the frame head, judge that this frame is road or pass this node and transmit under this node, control has the optical switch of two outputs and realizes the road and that pass node down Frame shunting.Do not carry out opto-electronic conversion for passing the light Frame that this node transmits, still enter full light forwarding cache device and carry out buffer memory with the form of light signal.Here, adopt number of patent application 02253429.2, name is called " double-ring coupled full optical buffer " as the buffer that solves competition.Adopt the control algolithm of " ring is preferential " principle, desire is set out on a journey from this node, be stored in Frame the full light forwarding cache device or that be stored in the electric buffer and dispatch, adjust cache-time, successively this two-way light Frame is sent, avoid competition and conflict.At last, setting out on a journey and during following road, adopt and multiplexingly reduce opto-electronic conversion speed at Frame with the demultiplexing technology.
Technical scheme based on the node apparatus of the elasticity light packet switching of dicyclo full optical buffer:
Node apparatus comprises; Receiving data frames buffer memory and frame head information reading module, down diverter module, Frame receiver module, the buffer memory of Frame that passes node and forwarding module, the Frame buffer memory of setting out on a journey and sending module, the control module on road down of the Frame road and that pass node.Its receiving data frames buffer memory and frame head information reading module adopt fibre delay line as full light data buffer; Diverter module following road and that pass the Frame of node is an optical switch; In the Frame receiver module on following road, optical demultiplexer is preceding, the parallel duplex photoelectric transformer after, perhaps single channel photoelectric transformer, so that the light code stream of serial is at a high speed converted to the parallel light code stream of low rate, for data rate is not very high code stream, needn't pass through serial to parallel conversion and only need carry out single channel to receive; Pass the buffer memory and the forwarding module of the Frame of node, adopting one, to write and read all be the controllable dicyclo full optical buffer of read-write of working under the commands for controlling of control module; The metadata cache of setting out on a journey in Frame buffer memory of setting out on a journey and the sending module adopts the controllable dicyclo full optical buffer of read-write, or the buffer of electricity; In the processing procedure of the light Frame of above-mentioned each module, adopt that a kind of frame head speed is relatively slow, the comparatively faster frame format of net load speed, perhaps the frame format that equates of speed; In view of the buffer memory of the Frame in the module, road and shunting down, close the road, forwarding all adopts optical device to finish, and has only reading with control module of frame head information to finish with electronic device.
Beneficial effect of the present invention is as follows:
At first, the present invention only carries out opto-electronic conversion to frame head, to a large amount of, only the net load from the light Frame of the node device process of elasticity light grouping ring does not carry out light-electricity-light conversion, buffer memory in full optical buffer just, thus reduced the workload of opto-electronic conversion.Secondly, the frame structure of present networks, its frame head adopts different transmission rates with net load.The data volume of net load is big, but does not carry out or seldom carry out opto-electronic conversion, so can transmit with higher speed.And the data volume of frame head is very little, though need carry out frequent opto-electronic conversion, because frame head speed is relatively low, can suitably reduce the opto-electronic conversion rate requirement.The utilance and the transmission speed of network link like this, have just further been improved.
Secondly, compare, reduced the exchange granularity with the wavelength exchange.Current wavelength switching technology, essence is a kind of simulation exchange and connection-oriented technology, and the exchange granularity is coarse, and the exchange resource wavelength is limited, compete and to block possibility big, thereby limited flexibility, extensibility and the plug and play performance of optical switching network greatly.The present invention proposes to adopt in the light territory numeral exchange or the packet technology without opto-electronic conversion, can improve greatly the exchange of all-optical network and route assignment flexibility, increase the quantity of exchangeing subscriber, automatic identification and the plug-and-play feature that realizes network node.Especially metropolitan area network requires highly for networking flexibility, extensibility, require to distinguish the service of different business grade, and the exchange granularity can not be too big, and professional is sudden strong, so the advantage of full light packet switch is more obvious in metropolitan area network.
The 3rd, owing to adopted the full optical buffer that can control read-write, competition and obstructing problem in the time of just can effectively overcoming data frames exchange in the light territory.Because full optical buffer inevitably will use relatively more expensive devices such as image intensifer, and Resilient Packet Ring is a kind of metropolitan area network based on the buffer access technology, buffer is its most important device, so the selection of buffer is crucial in the node apparatus.The present invention uses cheap fibre delay line full optical buffer for fixed delay.The buffer that has only those need be used to manage conflict and message is dispatched, because of its memory time uncertain, just need to use the buffer of the random read-write of real meaning.In RPR, because have only the Frame of transmitting and setting out on a journey to clash, so have only the forwarding cache device just to need random read-write, the memory usage of random read-write still less.After adopting full light packet technology, node structure is simplified relatively, can reduce the overall cost of node device greatly.
The 4th, adopt number of patent application 02253429.2 in this programme, name is called " double-ring coupled full optical buffer ", compares with the monocycle full optical buffer that uses 4 optical switches, and it is that a kind of price is relatively low, the full optical buffer of stable performance.Not only can obtain caching performance preferably, and further reduce the cost of node.
Description of drawings
Fig. 1 is based on the elasticity light Packet Switch Node device schematic diagram of dicyclo full optical buffer
Fig. 2 is the structural representation of receiving data frames buffer memory and frame head information reading module
Fig. 3 is the structural representation road down and the diverter module light Frame that passes node
Fig. 4 is the structural representation of the light Frame receiver module on following road
Fig. 5 passes the buffer memory of Frame of node and the structural representation of forwarding module
Fig. 6 is based on the join structural representation of dicyclo full optical buffer of 3 * 3 couplers of output and input
The structural representation of the dicyclo full optical buffer of 3 * 3 couplers that Fig. 7 is based on output and output joins, input and input join
Fig. 8 is the Frame buffer memory of setting out on a journey and a kind of structural representation of sending module
Fig. 9 is the Frame buffer memory of setting out on a journey and the another kind of structural representation of sending module
Figure 10 is based on the schematic flow sheet of the elasticity light grouping exchange method one of dicyclo full optical buffer
Figure 11 is based on the schematic flow sheet of the elasticity light grouping exchange method two of dicyclo full optical buffer
Figure 12 is the dicyclo topological structure schematic diagram of elasticity light packet switching looped network O-RPR
Among the figure: receiving data frames buffer memory and frame head information reading module 1, diverter module 2 following road and that pass the light Frame of node, the Frame receiver module 3 on following road, pass the buffer memory and the forwarding module 4 of the Frame of node, Frame buffer memory of setting out on a journey and sending module 5, control module 6, come from the light Frame 7 that elastic packet loop network is input to node, remove the Frame 8 of downstream node, the Frame 9 on following road, the Frame 10 of setting out on a journey, the control signal 11 that comes from control module, optical fiber shunting coupler 12, optical switch 13, fibre delay line full optical buffer 14, photoelectric transformer 15, go the frame head information 16 of control module, port one 7, the control signal 18 that comes from control module, automatically controlled or light-operated 1 goes into 2 goes out optical switch 19, port 20, port 21, optical demultiplexer 22, parallel duplex photoelectric transformer 23, read and write controllable dicyclo full optical buffer 24, port 25, the read-write control signal 26 that comes from control module, the read-write control signal 27 that comes from control module, electrical to optical converter 28, electricity buffer 29, optical multiplexer 30, photosynthetic road coupler 31, read and write controllable dicyclo full optical buffer 32, black line arrow is a light path, empty-line arrows is that electric pathway (parallel or serial) dotted arrow is the control signal path.
Embodiment
What the present invention proposed is the same based on the topological structure of the elasticity light packet switching looped network O-RPR of optical buffer with electric RPR topological structure, remains twin nuclei.As shown in figure 12.
Based on a kind of single channel structure of the elasticity light Packet Switch Node device of dicyclo full optical buffer, as shown in Figure 1.
Elasticity light Packet Switch Node device based on the dicyclo full optical buffer comprises: receiving data frames buffer memory and frame head information reading module, down diverter module, Frame receiver module, the buffer memory of Frame that passes node and forwarding module, the Frame buffer memory of setting out on a journey and sending module, the control module on road down of the Frame road and that pass node.
Receiving data frames buffer memory and frame head information reading module 1 comprise: optical fiber shunting coupler 12, electric control optical switch 13, fibre delay line full optical buffer 14 and a photoelectric transformer 15, concrete structure as shown in Figure 2.Following road with ring on pass the diverter module 2 of the Frame of node, it is optical switch 19 with a light signal input and two light signal output ends, and can between two outputs, switch according to the control signal 18 that comes from control module 6, concrete structure is as shown in Figure 3.In the Frame receiver module 3 on following road, optical demultiplexer 22 is preceding, parallel duplex photoelectric transformer 23 after, concrete structure as shown in Figure 4, so that the light code stream of serial is at a high speed converted to the parallel light code stream of low rate, for data rate is not very high code stream, needn't pass through serial to parallel conversion and only need carry out single channel to receive.Pass the buffer memory and the forwarding module 4 of the Frame of node, adopting one, to write and read all be the controllable dicyclo full optical buffer 24 of read-write of working under the commands for controlling of control module 6, and concrete structure as shown in Figure 5.Frame buffer memory of setting out on a journey and sending module 5 are gone into 1 photosynthetic road coupler 31, electrical optical converter 28, electric buffer 29, the optical multiplexer 30 that goes out by one 2 and are formed, and concrete structure as shown in Figure 9.Read and write controllable dicyclo full optical buffer 24,32, be based on the dicyclo full optical buffer of 3 * 3 couplers; The connection of 3 * 3 couplers is connected into the form that output and input join, concrete structure as shown in Figure 6, the form of be connected into perhaps that output and output join, input and input joining, concrete structure as shown in Figure 7.In the processing procedure of the light Frame of above-mentioned each module, adopt that a kind of frame head speed is relatively slow, the comparatively faster frame format of net load speed.
Come from the light Frame 7 that elastic packet loop network is input to node and be divided into two-way through optical fiber shunting couplers 12, as shown in Figure 2, one the tunnel enters fibre delay line full optical buffer 14 carries out metadata cache, and another road enters photoelectric transformer 15 by optical switch 13 and reads frame head information; Optical switch 13 is positioned at photoelectric transformer 15 fronts, by control module control, so that have only frame head just can enter optical-electrical converter 15; The control signal 11 of optical switch 13 is signals of telecommunication, or light signal; Adopt which kind of signal, determine according to the requirement of control; Photoelectric transformer 15 is photoactors that a transformation rate is enough to handle the frame head lower with respect to net load speed.The light signal input of optical switch 19 links to each other with fibre delay line full optical buffer 14 outputs of frame head information reading module 1 with the receiving data frames buffer memory by port one 7, two light signal output ends of optical switch 19 are respectively by port 21,20 link to each other with forwarding module 4 with the light Frame receiver module 3 on following road and the buffer memory of the Frame that passes node, as shown in Figure 3; The control signal that comes from control module 6 18 of optical switch 19 is signals of telecommunication, or light signal; Adopt which kind of signal, determine according to the requirement of control.Control module 6 determines that according to frame head information the road still enters the buffer memory of Frame and controllable dicyclo full optical buffer 24 buffer memorys of read-write of forwarding module 4 under this Frame, as shown in Figure 5.The Frame 10 of setting out on a journey deposits the electric buffer 29 of controlled module 6 controls of cache-time in, the electricity buffer 29 output signals of telecommunication are transformed into and traveling optical signal through electrical optical converter 28, and traveling optical signal is multiplexed with one road serial signal through optical multiplexer 30 and enters optical coupler 31, the output of optical coupler 31 is delivery outlets of the Frame 8 of downstream node, as shown in Figure 9.Be to send to be cached in the buffer memory of the Frame that passes node and the Frame in the forwarding module 4 on earth, still transmission is cached in the Frame buffer memory of setting out on a journey and the Frame in the sending module 5, be determined according to user's grade by control module 6.When transmission is cached in setting out on a journey during Frame 10 in the electric buffer 29, the read-write control signal 27 that comes from control module 6 drives the Frame of setting out on a journey and sends electric buffer 29, form the light Frame of one tunnel serial by electrical optical converter 28 and optical multiplexer 30, the light Frame is sent to photosynthetic road coupler 31, and the Frame 8 of downstream node is removed in output at last; When transmission is cached in the buffer memory of the Frame that passes node and the Frame in the forwarding module 4, as shown in Figure 5, the read-write control signal 26 that comes from control module 6, drive the controllable dicyclo full optical buffer 24 of read-write, by port 25, form the output of the Frame 8 that removes downstream node to photosynthetic road coupler 31.
Based on the another kind of single channel structure of the elasticity light Packet Switch Node device of dicyclo full optical buffer, as shown in Figure 1.
The difference of its structure and first kind of single channel structure is: Frame buffer memory of setting out on a journey and sending module 5 are gone into the 1 photosynthetic road coupler 31 that goes out, read-write controllable dicyclo full optical buffer 32, optical multiplexer 30, electrical optical converter 28 by one 2 and are formed, and concrete structure as shown in Figure 8; For overcoming the low bottleneck problem of bringing of electro-optical conversion speed, the signal of telecommunication of Frame 10 of setting out on a journey is transformed into and traveling optical signal through electrical optical converter 28, and traveling optical signal through optical multiplexer 30 be multiplexed with one the tunnel enter the read-write controllable dicyclo full optical buffer 32 buffer memorys, as shown in Figure 8; The cache-time of reading and writing controllable dicyclo full optical buffer 32 is by port 27 controlled module 6 controls; An input of optical coupler 31 links to each other with full optical buffer 24 by port 25, another input links to each other with the controllable dicyclo full optical buffer 32 of read-write in the sending module 5 with the Frame buffer memory of setting out on a journey, and the output of optical coupler 31 is delivery outlets of the Frame 8 of downstream node; Be to send to pass the buffer memory of node and the Frame in the forwarding module 4 on earth, still send the Frame of setting out on a journey in the controllable dicyclo full optical buffer 32 of read-write, determine by control module 6.If send the Frame 10 of setting out on a journey, the read-write control signal 27 that comes from control module 6 drives the controllable dicyclo full optical buffer 32 of read-write, and the light Frame is delivered to photosynthetic road coupler 31, forms Frame 8 outputs of removing downstream node at last.
Based on the elasticity light grouping exchange method one of dicyclo full optical buffer, flow process as shown in figure 10.
Employing frame head speed is relatively slow, net load is fast relatively, the light data frame structure of regular length.The light Frame also can adopt the frame head speed structure identical with net load speed.When from elastic packet loop network input light Frame, node is the frame head relatively slow to speed only, rather than whole Frame is carried out opto-electronic conversion, reduces the rate requirement of opto-electronic conversion, and obtains the routing iinformation of frame head; Come that the comparatively faster net load of speed enters the fibre delay line full optical buffer and carries out buffer memory directly with the form of light signal in the light Frame of node, improve the transparency of exchange.According to the routing iinformation in the frame head, judge that this frame is road or pass this node and transmit under this node, control has the optical switch of two outputs and realizes the road and that pass node down Frame shunting; Do not carry out opto-electronic conversion for passing the light Frame that this node transmits, still enter full light forwarding cache device and carry out buffer memory with the form of light signal.Full light forwarding cache device adopts the controllable dicyclo all-optical buffer technology of read-write.The Frame of setting out on a journey is cached in the electric buffer; Adopt the control algolithm of " ring is preferential " principle, the Frame and Frame all-optical buffer, to be transmitted of desire being set out on a journey from this node, be stored in the electric buffer are dispatched, adjust cache-time, successively this two-way light Frame is sent, avoid competition and conflict.Setting out on a journey and during following road, adopt and multiplexingly reduce opto-electronic conversion speed at Frame with the demultiplexing technology.
Based on the elasticity light grouping exchange method two of dicyclo full optical buffer, flow process as shown in figure 11.The difference of the flow process of it and method one is as follows:
The Frame of setting out on a journey is through light-to-current inversion, in the buffer full optical transmit buffer.Adopt the control algolithm of " ring is preferential " principle, the Frame and Frame all-optical buffer, to be transmitted of desire being set out on a journey from this node, be stored in the full optical buffer are dispatched, adjust cache-time, successively this two-way light Frame is sent, avoid competition and conflict.
To the comparatively faster net load of speed in the light Frame of coming node, adopt fibre delay line to carry out all-optical buffer, full light forwarding cache device and full light transmit buffer adopt the controllable dicyclo all-optical buffer technology of read-write.
The method of Frame shunting following road and that pass node is to shunt according to the method that the frame head information Control has an optical switch of two outputs.
Claims (10)
1. based on the node apparatus of the elasticity light packet switching of dicyclo full optical buffer, comprise: receiving data frames buffer memory and frame head information reading module, down diverter module, Frame receiver module, the buffer memory of Frame that passes node and forwarding module, the Frame buffer memory of setting out on a journey and sending module, the control module on road down of the Frame road and that pass node is characterized in that:
Receiving data frames buffer memory and frame head information reading module (1) comprise optical fiber shunting coupler (12), optical switch (13), a fibre delay line full optical buffer (14) and a photoelectric transformer (15), be divided into two-way for the light Frame (7) that is input to node from elastic packet loop network through optical fiber shunting coupler (12), one the tunnel enters fibre delay line full optical buffer (14) carries out metadata cache, another road enters photoelectric transformer (15) by optical switch (13) and reads frame head information, optical switch (13) is positioned at photoelectric transformer (15) front, by control module control, so that have only frame head just can enter photoelectric transformer (15);
Diverter module (2) following road and that pass the Frame of node is an optical switch (19);
In the Frame receiver module (3) on following road, optical demultiplexer (22) is preceding, parallel duplex photoelectric transformer (23) after, so that the light code stream of serial is at a high speed converted to the parallel light code stream of low rate, for data rate is not very high code stream, needn't pass through serial to parallel conversion and only need carry out single channel to receive;
Pass the buffer memory and the forwarding module (4) of the Frame of node, adopting one, to write and read all be the controllable dicyclo full optical buffer of read-write (24) of working under the commands for controlling of control module (6);
In Frame buffer memory of setting out on a journey and the sending module (5), adopt photosynthetic road coupler (31) that the Frame of node and the Frame ECDC road of setting out on a journey are formed the Frame that removes downstream node, the Frame buffer memory of setting out on a journey adopts read-write controllable dicyclo full optical buffer (32), or the buffer (29) of electricity;
In the processing procedure of the light Frame of above-mentioned each module, adopt that a kind of frame head speed is relatively slow, the comparatively faster frame format of net load speed; Control module (6) uses electronic device to finish.
2. the node apparatus of the elasticity light packet switching based on the dicyclo full optical buffer according to claim 1, it is characterized in that: the control signal (11) of the optical switch (13) in receiving data frames buffer memory and the frame head information reading module (1) is the signal of telecommunication, or light signal; Adopt which kind of signal, determine according to the requirement of control.
3. the node apparatus of the elasticity light packet switching based on the dicyclo full optical buffer according to claim 2, it is characterized in that: the photoelectric transformer (15) in receiving data frames buffer memory and the frame head information reading module (1) is the photoactor that a transformation rate is enough to handle the frame head that is lower than net load speed.
4. the node apparatus of the elasticity light packet switching based on the dicyclo full optical buffer according to claim 1, it is characterized in that: diverter module (2) following road and that pass the Frame of node, it is optical switch (19) with a light signal input and two light signal output ends, and can between two light signal output ends, switch according to the control signal that comes from control module (6) (18); Light signal input as the optical switch (19) of described diverter module links to each other with fibre delay line full optical buffer (14) output of frame head information reading module (1) with the receiving data frames buffer memory by first port (17), links to each other with forwarding module (4) with the buffer memory of the Frame receiver module (3) on following road and the Frame that passes node by second port (21), the 3rd port (20) respectively as two light signal output ends of the optical switch (19) of described diverter module; The control signal that comes from control module (6) (18) as the optical switch (19) of described diverter module is the signal of telecommunication, or light signal; Adopt which kind of signal, determine according to the requirement of control.
5. the node apparatus of the elasticity light packet switching based on the dicyclo full optical buffer according to claim 1 is characterized in that: read and write controllable dicyclo full optical buffer (24,32), be based on the dicyclo full optical buffer of dicyclo 3 * 3 couplers; The connection of 3 * 3 couplers is connected into the form that output and input join, the form of be connected into perhaps that output and output join, input and input joining.
6. the node apparatus of the elasticity light packet switching based on the dicyclo full optical buffer according to claim 1 is characterized in that: Frame buffer memory of setting out on a journey and sending module (5) are gone into the 1 photosynthetic road coupler (31) that goes out, read-write controllable dicyclo full optical buffer (32), optical multiplexer (30) and electrical optical converter (28) by one 2 and are formed; For overcoming the low bottleneck problem of bringing of electro-optical conversion speed, Frame (10) signal of telecommunication of setting out on a journey is transformed into and traveling optical signal through electrical optical converter (28), and traveling optical signal is multiplexed with one road serial signal through optical multiplexer (30), enters read-write controllable dicyclo full optical buffer (32) buffer memory; The cache-time of reading and writing controllable dicyclo full optical buffer (32) is by the controlled module of the 4th port (27) (6) control; An input of photosynthetic road coupler (31) links to each other with the controllable dicyclo full optical buffer of the read-write of forwarding module (4) (24) with the buffer memory of the Frame that passes node by five-port (25), another input links to each other with the controllable dicyclo full optical buffer of read-write (32) in the sending module (5) with the Frame buffer memory of setting out on a journey, and the output of photosynthetic road coupler (31) is the delivery outlet of the Frame (8) of downstream node;
Frame buffer memory of setting out on a journey and sending module (5) or go into the 1 photosynthetic road coupler (31) that goes out, electrical optical converter (28), electric buffer (29), optical multiplexer (30) by one 2 and form; The Frame (10) of setting out on a journey deposits the electric buffer (29) of the controlled module of cache-time (6) control in, electricity buffer (29) the output signal of telecommunication is transformed into and traveling optical signal through electrical optical converter (28), and traveling optical signal is multiplexed with one road serial optical signal through optical multiplexer (30) and enters photosynthetic road coupler (31), and the output of photosynthetic road coupler (31) is the delivery outlet of the Frame (8) of downstream node.
7. based on the method for the elasticity light packet switching of dicyclo full optical buffer, it is characterized in that: adopt that frame head speed is relatively slow, net load speed is fast relatively, the light data frame structure of regular length; When elastic packet loop network input light Frame, node is the frame head relatively slow to speed only, rather than whole Frame is carried out opto-electronic conversion, reduces the rate requirement of opto-electronic conversion, and obtains the routing iinformation of frame head; Come in the light Frame of node, the comparatively faster net load of speed directly enters the fibre delay line full optical buffer with the form of light signal and carries out buffer memory, improves the transparency of exchange; According to the routing iinformation in the frame head, judge that this frame is road or pass this node and transmit under this node, control has the optical switch of two outputs and realizes the road and that pass node down Frame shunting; Do not carry out opto-electronic conversion for passing the light Frame that this node transmits, still enter full light forwarding cache device and carry out buffer memory with the form of light signal; Adopt the control algolithm of " ring is preferential " principle, desire is set out on a journey from this node, be stored in Frame the full light transmit buffer or that be stored in the electric buffer and dispatch, adjust cache-time, to pass light Frame that this node transmits successively and send, avoid competition and conflict from the light Frame that this node is set out on a journey; Setting out on a journey and during following road, adopt and multiplexingly reduce opto-electronic conversion speed at Frame with the demultiplexing technology.
8. the method for the elasticity light packet switching based on the dicyclo full optical buffer according to claim 7 is characterized in that: the light Frame adopts the frame head speed structure identical with net load speed.
9. the method for the elasticity light packet switching based on the dicyclo full optical buffer according to claim 7, it is characterized in that: to the comparatively faster net load of speed in the light Frame of coming node, adopt the all-optical buffer method to carry out all-optical buffer, wherein the fibre delay line full optical buffer adopts fibre delay line, and full light forwarding cache device and full light transmit buffer adopt the controllable dicyclo all-optical buffer technology of read-write.
10. the method for the elasticity light packet switching based on the dicyclo full optical buffer according to claim 7, it is characterized in that: the method for Frame shunting following road and that pass node is to shunt according to the method that the frame head information Control has an optical switch of two outputs.
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| CN101150500B (en) * | 2006-09-18 | 2010-05-19 | 上海交通大学 | Method and system for solving channel competition |
| CN1996799B (en) * | 2006-11-30 | 2010-04-14 | 上海交通大学 | Optical packet access method based on the optical and electrical mixed cache structure |
| CN105610494B (en) * | 2015-10-29 | 2018-05-04 | 电子科技大学 | A kind of monitoring mark design method based on node pre-selection in all-optical network |
| CN105337658A (en) * | 2015-10-29 | 2016-02-17 | 电子科技大学 | Method for designing incremental monitoring traces in all-optical network based on service routes |
| CN105894005B (en) * | 2016-04-01 | 2020-04-07 | 河北省科学院 | Optical signal buffer |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1343082A (en) * | 2001-11-01 | 2002-04-03 | 上海交通大学 | Optical packet switching technique in multi-wavelength mark mode |
| JP2003110600A (en) * | 2001-09-26 | 2003-04-11 | Fujitsu Ltd | Transmitter |
| CN1417604A (en) * | 2002-11-27 | 2003-05-14 | 北方交通大学 | Double-ring coupled all optical buffer storage |
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| JP2003110600A (en) * | 2001-09-26 | 2003-04-11 | Fujitsu Ltd | Transmitter |
| CN1343082A (en) * | 2001-11-01 | 2002-04-03 | 上海交通大学 | Optical packet switching technique in multi-wavelength mark mode |
| CN1417604A (en) * | 2002-11-27 | 2003-05-14 | 北方交通大学 | Double-ring coupled all optical buffer storage |
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