CN1719944A - Double ring shaped optical exchanging system constituted with non-blocking light burst exchange ring exchange node - Google Patents
Double ring shaped optical exchanging system constituted with non-blocking light burst exchange ring exchange node Download PDFInfo
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Abstract
A double ring photo-switch system composed of multiple blockless optical burst switching ring nodes includes multiple switching nodes and fibers having two fiber input interfaces, two output interface and electric interfaces connected with local data services and assembled to other nodes on the burst packet sending ring, fibers are set between two adjacent switch nodes, multiple nodes and fibers constitute a double-ring topology, light signals are transmitted along clockwise on the outer ring of the topology and transmitted along counter-clockwise on the internal ring.
Description
Technical field
What the present invention relates to is a kind of system that belongs to technical field of optical fiber communication, specifically, is a kind of Crossed Circle optical switching system that is made of clog-free optical outburst switching loop switching node.
Background technology
Light burst packets exchange (Optical Burst Switching--OBS) is a kind of new light switching technology that occurs in recent years.The basic principle of OBS is that data and control information transmit with the channel of cutting apart.It is a burst packets that the fringe node of OBS is dressed up several IP packet group, and control information (being called the control grouping) by sending with the form of dividing into groups in advance, after each intermediate node carries out light/electric conversion, processing, reserved bandwidth resource to the control grouping, network edge node transmits the data that assembling becomes burst packets again, data can remain in the light territory, and avoided handling one by one in the packet switching trouble of packets headers, also avoid simultaneously or reduced going out demand to the light buffer memory at the network core node.The loop network topology is the most a kind of topological structure of normal employing in the metropolitan area network, and it is low to have network construction cost, the characteristics that the network protection ability is strong.OBS equipment is carried out annular networking, and to be used for metropolitan area network be a good solution that satisfies the ever-increasing bandwidth demand of metropolitan area network.But because the OBS switching equipment only has on a small quantity or do not have the light buffer memory, optical outburst switching loop exists to be gone up ring or encircles the problem that burst packets is blocked down.Generally all be to adopt the active packet loss or adopt the mode of token to solve this problem now, this mode greatly reduces the resource utilization of network.
Find that by prior art documents " Resilient Packet Ring " (Resilient Packet Ring--RPR) (ieee standard 802.17, draft 3.0,2004 years) is a switching system that is used for metropolitan area network.This system is: the topological structure of Crossed Circle; Packet-based exchanged form, the statistic multiplexing of realization bandwidth; Packet only transmits between source node and destination node, and destination node is extractd the packet of local reception to realize the spatial reuse of Internet resources from encircling; Use fair bandwidth to manage between the different nodes and obtain data transmission capabilities liberally; Adopt source routing or loopback technology that the network protection of 50ms level is provided.RPR is a kind of exchanged form based on electric territory, and the grouping of each arrival node all must be through the process that stores, unpacks, handles, packs.And according to statistics in the metropolitan area looped network the received data nearly about 80% of each node all be to transmit data, node processing a large amount of and the data that self have nothing to do, limited the handling capacity of network greatly.
Summary of the invention
The objective of the invention is to overcome the shortcoming of existing OBS and RPR network, a kind of Crossed Circle optical switching system that is made of clog-free optical outburst switching loop switching node is proposed, make its advantage, to satisfy along with IP operation develops the ever-increasing demand of metropolitan area network bandwidth in conjunction with OBS and RPR.
The present invention is achieved through the following technical solutions, the present invention includes: a plurality of clog-free optical outburst switching loop switching nodes and optical fiber, optical fiber is located between two adjacent clog-free optical outburst switching loop switching nodes, a plurality of clog-free optical outburst switching loop switching nodes and optical fiber are formed a dicyclo type topological structure, on the outer shroud of this dicyclo type topological structure, light signal is by sending clockwise, and on the interior ring of this dicyclo type topological structure, light signal is by counterclockwise sending.
Described clog-free optical outburst switching loop switching node has two optical fiber input interfaces, two optical fiber output interfaces and electrical interface, clog-free optical outburst switching loop switching node utilizes electrical interface to insert local various data service, and assembling becomes burst packets and sends to other clog-free optical outburst switching loop switching node on the ring.
Described clog-free optical outburst switching loop switching node comprises the same device of two covers, be respectively applied in the processing, data flow on the outer shroud, every suit device comprises: first demodulation multiplexer, the burst packets assembler, the burst packets buffer memory, burst packets control information processor, the fair bandwidth allocation device, the first wavelength sorter, the wavelength selectivity memory, tunable optical transmitter, photodetector, first multiplexer, the burst packets control information processor and first demodulation multiplexer, the burst packets buffer memory, the fair bandwidth allocation device, tunable optical transmitter, the wavelength selectivity memory, first multiplexer is connected, the wavelength selectivity memory and the first wavelength sorter, burst packets control information processor, first multiplexer is connected, the first wavelength sorter and first demodulation multiplexer, burst packets control information processor links to each other, photodetector is connected with the first wavelength sorter, fair bandwidth allocation device and burst packets assembler, the burst packets buffer memory, burst packets control information processor links to each other, first demodulation multiplexer with go into optical fiber, the first wavelength sorter is connected with burst packets control information processor, tunable optical transmitter and burst packets buffer memory, burst packets control information processor, first multiplexer links to each other, first multiplexer and burst packets control information processor, tunable optical transmitter, the optical wavelength selective memory is connected with optical fiber.
Described burst packets control information processor is the core of whole clog-free optical outburst switching loop switching node, be responsible for generating local control information of uploading burst packets, processing is from the burst packets control information of other node, determine opportunity and wavelength that local burst packets sends, and avoid because local burst packets is uploaded loop resistance plug under the last loop resistance plug that causes and the destination node by control wavelength selective memory.
Described wavelength selectivity memory, under the control of burst packets control information processor, the stored time span of burst packets of control different wave length.
Described burst packets assembler receives the data service that encircles on this website and is connected with the burst packets buffer memory, local IP packet is formed on the length according to different destinations be limited to TB
MaxBurst packets, and be stored in respectively in the burst packets buffer memory according to the destination difference.
The control of the described first wavelength sorter by burst packets control information processor will be arranged in the burst packets that specific wavelength, this node land and sort out from numerous forwarding burst packets.
The burst packets that described photodetector will be in the light territory is converted into the signal of telecommunication.
Described fair bandwidth allocation device is data cached in the local burst packets assembling parts by monitoring, fair bandwidth is calculated in data stacking situation and the Internet resources operating position that is provided by burst packets control information processor and the fair bandwidth control information that comes from the downstream in the burst packets buffer memory, suppress this node or upstream node to the too high data traffic volume of certain destination node, or impel this node or upstream node to increase the data traffic volume to improve the bandwidth utilization rate.
The temporary transient local burst packets of not having an opportunity to send that described burst packets buffer memory will be finished assembling with burst packets is stored according to the destination address difference, and under the control of burst packets control information processor, the burst packets that can send is sent in the tunable optical transmitter group and is sent.
Described first demodulation multiplexer will come burst packets control information place wavelength to separate from the wavelength of numerous carrying burst packets from the upstream, be sent in the burst packets control information processor.
Described tunable optical transmitter is under the control of burst packets control information processor, and the burst packets of selecting suitable wavelengths that assembling is finished sends on certain wavelengths.
Described first multiplexer converges to out this light burst packets of encircling, the local upstream stations burst packets of transmitting and the burst packets control information of their correspondences in the optical fiber on the ground.
Described wavelength selectivity memory is a very important components in clog-free optical outburst switching loop switching node, is made up of the second wavelength sorter, fibre delay line and second multiplexer.The second wavelength sorter has two delivery outlets, and one of them delivery outlet uses fibre delay line to be connected to second multiplexer, and the another one delivery outlet then directly connects second multiplexer.
Described fibre delay line, it is the multi-stage fiber delay line, the equal in length of the first order and second level fibre delay line, but every grade of fibre delay line length is longer one times than upper level thereafter, and the length of afterbody fibre delay line is half of memory maximum storage time Len req.
The second wavelength sorter and the fibre delay line progression of forming the wavelength selectivity memory are many more, and is also high more for the control precision of light burst packets length memory time of storing.In clog-free optical outburst switching loop system, the maximum length of each burst packets is limited, supposes that the maximum transmitting time length of a burst packets is TB
Max, setting aside some time between maximum burst packets control information and the burst packets is TC
Max, the wavelength selectivity memory can provide maximum time length T B to burst packets
Max+ TC
Max, precision is (TB
Max+ TC
Max)/2
mCache-time (wherein m is the progression of light buffer memory).
The described second wavelength sorter comprises: one second demodulation multiplexer, two second multiplexers and array of photoswitch, described array of photoswitch is by forming with 1 * 2 optical switch that system uses number of wavelengths to equate, the input port of each 1 * 2 optical switch is connected with second demodulation multiplexer, and two delivery outlets of each 1 * 2 optical switch are connected with two second multiplexers respectively.
Described 1 * 2 optical switch can carry out switch under the control of extraneous control signal switches, and input optical signal in two output ports is exported.
The light signal that contains a plurality of wavelength of importing the second wavelength sorter enters the light signal that second demodulation multiplexer is decomposed into a plurality of single wavelengths and enters 1 * 2 corresponding optical switch respectively; 1 * 2 array of photoswitch is divided into two classes with these light signals and outputs to two second multiplexers respectively under the control of extraneous control signal, finishes the work that the second wavelength sorter becomes the light signal letter sorting of multi-wavelength two classes.
To become burst packets in the assembling of burst packets assembler place from the data of this locality, and it is to be sent to enter burst packets buffer memory etc.When burst packets storage condition in burst packets control information that burst packets control information processor comes according to the upstream and the current wavelength selective memory judges that the current local data that can carry out is when sending, burst packets in the burst packets buffer memory will transfer light signal to by the tunable optical transmitter group and enter first multiplexer and other light signal and be combined into one the tunnel and enter optical fiber, to generate by burst packets control information processor simultaneously, and send to first multiplexer and other light signal by the tunable optical transmitter group and be combined into one the tunnel and enter optical fiber with the corresponding burst packets control of these burst packets grouping.Enter burst packets control information processor after becoming the signal of telecommunication through first demodulation multiplexer through first photodetector from the control information of the light burst packets of upstream node, and handle herein, judge and revise, if corresponding light burst packets destination address is this node, then this control information will be buried in oblivion, and continues to send downstream through first multiplexer otherwise this control information transfers light signal to by the tunable optical transmitter group after being modified.From the light burst packets of upstream by first demodulation multiplexer with after the burst packets control information separates, become through first wavelength sorter letter sorting and to land burst packets and to transmit burst packets, the burst packets of wherein landing arrives second photodetector, finish opto-electronic conversion and become the signal of telecommunication to send to the end user, transmit burst packets and then enter the wavelength selectivity memory, carry out buffer memory under the control of light burst packets control information processor, the light burst packets of finishing buffer memory enters first multiplexer and continues to send downstream.Fair bandwidth control information from the downstream will enter the fair bandwidth allocation device and utilize situation to calculate from this node bandwidth that burst packets control information processor provides, and the bandwidth control information that generates this node upstream sends.
The light burst packets sorts through the second wavelength sorter, the burst packets that needs are postponed is diverted to the delivery outlet that connects fibre delay line, and the burst packets that does not need to postpone is diverted to the delivery outlet that is connected with fibre delay line, finally all synthesizes one road signal through second multiplexer through the light burst packets of two different delivery outlets.
The present invention is using the wavelength selectivity memory under the control of burst packets control information processor, under the situation of ring burst packets and reduction network resource utilization, avoids producing burst packets and blocks on not abandoning.Burst packets is blocked production two kinds:
First kind is because local burst packets is uploaded loop resistance plug on the local burst packets that causes.A reason that produces is because this locality when beginning to send burst packets, the target wavelength of selecting is not taken by the upstream burst packets, but after local burst packets control information is sent, before local burst packets is sent completely, has from the burst packets of upstream and need use identical wavelength; Another burst packets that may be lagged behind by wavelength selectivity memory stores quilt has caught up with from the burst packets of the identical wavelength of upstream.On local burst packets occurring during the loop resistance plug, the wavelength selectivity memory will be under the control of burst packets control information processor, with burst packets storage a period of time that the upstream is come, avoid this burst packets of encircling on the ground or be stored in burst packets in the wavelength selectivity memory.This, length was that local burst packets (or burst packets of storage) transmits the deadline and deducts upstream burst packets time of advent memory time.
Second kind of obstruction is the following loop resistance plug of destination node.Because each node can carry out the burst packets limited amount of light-to-current inversion simultaneously, such as being K, when sometime, certain node has carried out the light-to-current inversion of K burst packets at the same time, K+1 is the burst packets arrival of destination with this website at this moment, has just produced the following loop resistance plug of destination node.After local burst packets assembling is finished, if after burst packets control information processor is found to encircle on the local burst packets, will cause the following loop resistance plug of destination node in clog-free optical outburst switching loop switching node, then local burst packets can not go up ring; If after local burst packets sent control information, before local burst packets is sent completely, owing to the reason from the upstream burst packets causes the following loop resistance plug of destination node, or there is the overlapping following loop resistance plug that causes destination node on the certain hour owing to being stored in burst packets in the wavelength selectivity memory and upstream burst packets in the past.In this case, burst packets control information processor will be stored a period of time according to the needs of maximization bandwidth availability ratio certain burst packets that the upstream is next in the wavelength selectivity memory.This time period equals local burst packets (or the burst packets in the memory) and transmits the deadline and deduct the burst packets time of advent that is stored.
The present invention uses the fair bandwidth allocation device, according to the fair bandwidth that is calculated to different nodes to the data stacking situation of each targeted sites, guarantees that each node obtains fair access chance.When certain node to its certain destination node data stacking in burst packets assembling parts buffer memory arrives the burst packets to certain destination in certain thresholding or the burst packets buffer and never obtains send opportunity within a certain period of time, the fair bandwidth allocation device will upstream send control information to suppress the data traffic volume of upstream node to this destination node, makes local data can obtain Internet resources and sends.When local data is not piled up, and Internet resources are when very idle, and the fair bandwidth allocation device will upstream nodes send control information, and impels upstream node to increase the data traffic volume and improves network resource utilization.The present invention can realize the service of differentiation.The shared bandwidth of each service is limited by fair algorithm and operable wavelength in the clog-free optical outburst switching loop, and time delay is subjected to burst packets by the control of wavelength selectivity memory stores probability end to end, number of wavelengths more than needs can be provided by the service to high priority slightly, make the required bandwidth of service to be guaranteed, and average end-to-end time delay is lower.The service that priority is minimum can participate in remaining wavelength competition.The present invention can realize network protection efficiently; owing to adopt the topological structure of dicyclo; can be when network breaks down; business on the inner and outer ring is switched; and offset time between burst packets control information and the burst packets is set according to new route; promptly can walk around the fault point, finish the service protection of heavy-route mode.
The advantage of RPR and OBS has been merged in the present invention, clog-free optical outburst switching loop switching node only unpacks and opto-electronic conversion the burst packets that download this locality, for a burst packets processing control information of transmitting, the processing of the data message that this locality is not landed is carried out in the light territory fully pellucidly, has realized at a high speed, the exchange of big throughput.The invention solves insoluble obstructing problem among the OBS simultaneously, make that the bandwidth availability ratio of a clog-free optical outburst switching loop system is very high, and owing in the processing of light signal, only use the device of commercialization fully such as fibre delay line, 1 * 2 optical switch, recovery usefulness and demodulation multiplexer, make that clog-free optical outburst switching loop switching node equipment is simple and easy to realize, and have very low cost.
Description of drawings
Fig. 1 is a structured flowchart of the present invention
Fig. 2 is the structured flowchart of the clog-free optical outburst switching loop switching node of the present invention
Fig. 3 is the structured flowchart of wavelength selectivity memory of the present invention
Fig. 4 is the structured flowchart of wavelength sorter of the present invention
Embodiment
Embodiment
As shown in Figure 1, the present invention includes: six clog-free optical outburst switching loop switching nodes, each switching node have two optical fiber input interfaces, two optical fiber output interfaces and electrical interface.Adopt the dicyclo fiber direct connection by optical fiber interface between the adjacent node, be in that burst packets stream flows in the direction of the clock in the optical fiber of outer shroud, burst packets stream is according to counterclockwise flowing in the optical fiber of interior ring.Each website all can insert local service and assembling becomes burst packets, sends burst packets to targeted sites again to interior ring of how much being chosen in of targeted sites jumping figure or outer shroud.When network failure occurring, only need to be subjected on the inner and outer ring of fault effects data flow to exchange, adjust burst packets control information Timing Advance again and can realize the protect networks function.
As shown in Figure 2,, only reflected among the figure and a website logical construction that the burst packets sending direction is relevant, promptly with the relevant part of clog-free optical outburst switching loop outer shroud for for purpose of brevity.In clog-free optical outburst switching loop site structure figure, dark part is the electric treatment part, and light-colored part is the optical processing part.The electric processing section branch comprises: burst packets assembler, burst packets buffer memory, burst packets control information processor, fair bandwidth allocation device.Optical processing partly comprises: first demodulation multiplexer, the first wavelength sorter, wavelength selectivity memory, tunable optical transmitter group, first photodetector, second photodetector, first multiplexer.Described clog-free optical outburst switching loop switching node comprises the same device of two covers, be respectively applied in the processing, data flow on the outer shroud, every suit device comprises: first demodulation multiplexer, the burst packets assembler, the burst packets buffer memory, burst packets control information processor, the fair bandwidth allocation device, the first wavelength sorter, the wavelength selectivity memory, tunable optical transmitter, photodetector, first multiplexer, the burst packets control information processor and first demodulation multiplexer, the burst packets buffer memory, the fair bandwidth allocation device, tunable optical transmitter, the wavelength selectivity memory, first multiplexer is connected, the wavelength selectivity memory and the first wavelength sorter, burst packets control information processor, first multiplexer is connected, the first wavelength sorter and first demodulation multiplexer, burst packets control information processor links to each other, photodetector is connected with the first wavelength sorter, fair bandwidth allocation device and burst packets assembler, the burst packets buffer memory, burst packets control information processor links to each other, first demodulation multiplexer with go into optical fiber, the first wavelength sorter is connected with burst packets control information processor, tunable optical transmitter and burst packets buffer memory, burst packets control information processor, first multiplexer links to each other, first multiplexer and burst packets control information processor, tunable optical transmitter, the optical wavelength selective memory is connected with optical fiber.
Passive Optical Components comprises that first multiplexer, first demodulation multiplexer, optical fiber all can adopt now common device on the market in the optical processing part.Active optical component comprises tunable optical transmitter group, first optical receiver, second optical receiver, the first wavelength sorter.Wherein require in the tunable optical emission unit to have a fixed-frequency on the control wavelength LASER Light Source and a tuned speed in microsecond magnitude LASER Light Source.When the radiant cost of high-speed adjustable is too high, can adopt and form the optical transmitter array by a plurality of different light sources that send wavelength and realize.The receiver that optical receiver adopts range of receiving to cover service wavelength gets final product, and product commonly used all can be satisfied the demand on the current market.
Described burst packets control information processor is the core of whole clog-free optical outburst switching loop switching node, be responsible for generating local control information of uploading burst packets, processing is from the burst packets control information of other node, determine opportunity and wavelength that local burst packets sends, and avoid because local burst packets is uploaded loop resistance plug under the last loop resistance plug that causes and the destination node by control wavelength selective memory.Can adopt the x86 series CPU of INTEL Corp. or the CPU and the semiconductor memory of other company to realize.
Described wavelength selectivity memory, under the control of burst packets control information processor, the stored time span of burst packets of control different wave length.
Described burst packets assembler receives the data service that encircles on this website and is connected with the burst packets buffer memory, local IP packet is formed on the length according to different destinations be limited to TB
MaxBurst packets, and be stored in respectively in the burst packets buffer memory according to the destination difference.
The temporary transient local burst packets of not having an opportunity to send that described burst packets buffer memory will be finished assembling with burst packets is stored according to the destination address difference, and under the control of burst packets control information processor, the burst packets that can send is sent in the tunable optical transmitter group and is sent.Burst packets assembler and burst packets buffer memory can utilize semiconductor memory chip and supporting little process chip of controlling to realize.
The control of the described first wavelength sorter by burst packets control information processor will be arranged in the burst packets that specific wavelength, this node land and sort out from numerous forwarding burst packets.
The burst packets that described photodetector will be in the light territory is converted into the signal of telecommunication.
Described fair bandwidth allocation device is data cached in the local burst packets assembling parts by monitoring, fair bandwidth is calculated in data stacking situation and the Internet resources operating position that is provided by burst packets control information processor and the fair bandwidth control information that comes from the downstream in the burst packets buffer memory, suppress this node or upstream node to the too high data traffic volume of certain destination node, or impel this node or upstream node to increase the data traffic volume to improve the bandwidth utilization rate.The fair bandwidth allocation device also is to realize by microprocessor and semiconductor memory, can use the parts of identical function in the existing RPR router.
Described first demodulation multiplexer will come burst packets control information place wavelength to separate from the wavelength of numerous carrying burst packets from the upstream, be sent in the burst packets control information processor.
Described tunable optical transmitter is under the control of burst packets control information processor, and the burst packets of selecting suitable wavelengths that assembling is finished sends on certain wavelengths.
Described first multiplexer converges to out this light burst packets of encircling, the local upstream stations burst packets of transmitting and the burst packets control information of their correspondences in the optical fiber on the ground.
As shown in Figure 3, the wavelength selectivity memory is made up of the fibre delay line of m+1 the second wavelength sorter and second multiplexer and m+1 root different length, the selection of m is to be determined by the time precision that hope reaches, the m value is big more, burst packets precision memory time that can control is just high more, but the upper limit of m is subjected to the switching time restriction of optical switch, and a shortest fibre delay line must be able to provide the light signal that is not less than the optical switch switching time to postpone.The total length L of all fibre delay lines=(TB
Max+ TC
Max) * C, C are the speed of light in the optical fiber.The second wavelength sorter has two delivery outlets, and one of them delivery outlet uses fibre delay line to be connected to second multiplexer, and the another one delivery outlet then directly connects second multiplexer.The light burst packets sorts through the second wavelength sorter, the burst packets that needs are postponed is diverted to the delivery outlet that connects fibre delay line, and the burst packets that does not need to postpone is diverted to the delivery outlet that is connected with fibre delay line, finally all synthesizes one road signal through second multiplexer through the light burst packets of two different delivery outlets.
The multi-stage fiber delay line that uses in the wavelength selectivity memory, the equal in length of the first order and second level fibre delay line, but every grade of fibre delay line length is longer one times than upper level thereafter, and the length of afterbody fibre delay line is half of memory maximum storage time Len req.Can be by m+1 wavelength sorter being controlled promptly with the light burst packets of arbitrary wavelength with (TB
Max+ TC
Max)/2m is least unit storage O ~ TB
Max+ TC
MaxTime span.
As shown in Figure 4, the wavelength sorter was used for n different wavelength letter sorting become two classes by n 1 * 2 optical switch, second demodulation multiplexer and two the 3rd multiplexer integrated compositions.The light signal that comes from the input port is divided into n different wavelength and enters in each self-corresponding 1 * 2 optical switch through second demodulation multiplexer.Each optical switch is under the control of control signal, with light signal from up and down selecting one output two delivery outlets, to converge to one the 3rd multiplexer by delivery outlet 1 output from the light signal of last delivery outlet output, converge to another one the 3rd multiplexer by delivery outlet 2 outputs from the light signal of down delivery outlet output, thereby realize multiplexing multipath light signal is together sorted the function that becomes two classes as required.Wherein 1 * 2 optical switch need adopt the high-speed optical switch of switching speed below the microsecond magnitude, and the optical switch type that can select for use now has: MZI optical switch, holographic grating switch, acoustooptic switch etc.Second multiplexer and the 3rd demodulation multiplexer do not have special requirement, and the commercialization product all can be satisfied the demand on the current market.Also second demodulation multiplexer, optical switch and the 3rd multiplexer can be integrated, utilize a chip to realize.
All devices that adopted among the present invention all can be selected the device of full maturity, practicability for use, employed fair bandwidth allocation algorithm, signaling protocol etc. all carried out detailed discussion in RPR data relevant with OBS and document, promptly can be used for native system by simply revising at clog-free optical outburst switching loop characteristics.
Claims (10)
1. Crossed Circle optical switching system that constitutes by clog-free optical outburst switching loop switching node, comprise: a plurality of clog-free optical outburst switching loop switching nodes and optical fiber, it is characterized in that, described clog-free optical outburst switching loop switching node, comprise the same device of two covers, be respectively applied in the processing, data flow on the outer shroud, every suit device comprises: first demodulation multiplexer, the burst packets assembler, the burst packets buffer memory, burst packets control information processor, the fair bandwidth allocation device, the first wavelength sorter, the wavelength selectivity memory, tunable optical transmitter, photodetector, first multiplexer, the burst packets control information processor and first demodulation multiplexer, the burst packets buffer memory, the fair bandwidth allocation device, tunable optical transmitter, the wavelength selectivity memory, first multiplexer is connected, the wavelength selectivity memory and the first wavelength sorter, burst packets control information processor, first multiplexer is connected, the first wavelength sorter and first demodulation multiplexer, burst packets control information processor links to each other, photodetector is connected with the first wavelength sorter, fair bandwidth allocation device and burst packets assembler, the burst packets buffer memory, burst packets control information processor links to each other, first demodulation multiplexer with go into optical fiber, the first wavelength sorter is connected with burst packets control information processor, tunable optical transmitter and burst packets buffer memory, burst packets control information processor, first multiplexer links to each other, first multiplexer and burst packets control information processor, tunable optical transmitter, the optical wavelength selective memory is connected with optical fiber, optical fiber is located between two adjacent clog-free optical outburst switching loop switching nodes, a plurality of clog-free optical outburst switching loop switching nodes and optical fiber are formed a dicyclo type topological structure, on the outer shroud of this dicyclo type topological structure, light signal is by sending clockwise, on the interior ring of this dicyclo type topological structure, light signal is by counterclockwise sending.
2. the Crossed Circle optical switching system that constitutes by clog-free optical outburst switching loop switching node according to claim 1, it is characterized in that, described clog-free optical outburst switching loop switching node has two optical fiber input interfaces, two optical fiber output interfaces and electrical interface, clog-free optical outburst switching loop switching node utilizes electrical interface to insert local various data service, and assembling becomes burst packets and sends to other clog-free optical outburst switching loop switching node on the ring.
3. the Crossed Circle optical switching system that constitutes by clog-free optical outburst switching loop switching node according to claim 1, it is characterized in that, described burst packets control information processor is the core of whole clog-free optical outburst switching loop switching node, be responsible for generating local control information of uploading burst packets, processing is from the burst packets control information of other node, determine opportunity and wavelength that local burst packets sends, and avoid because local burst packets is uploaded loop resistance plug under the last loop resistance plug that causes and the destination node by control wavelength selective memory.
4. the Crossed Circle optical switching system that constitutes by clog-free optical outburst switching loop switching node according to claim 1, it is characterized in that, described wavelength selectivity memory, under the control of burst packets control information processor, the stored time span of burst packets of control different wave length; Described burst packets assembler receives the data service that encircles on this website and is connected with the burst packets buffer memory, local IP packet is formed on the length according to different destinations be limited to TB
MaxBurst packets, and be stored in respectively in the burst packets buffer memory according to the destination difference; The control of the described first wavelength sorter by burst packets control information processor will be arranged in the burst packets that specific wavelength, this node land and sort out from numerous forwarding burst packets; The burst packets that described photodetector will be in the light territory is converted into the signal of telecommunication.
5. the Crossed Circle optical switching system that constitutes by clog-free optical outburst switching loop switching node according to claim 1, it is characterized in that, described fair bandwidth allocation device is by data cached in the local burst packets assembling parts of monitoring, fair bandwidth is calculated in data stacking situation and the Internet resources operating position that is provided by burst packets control information processor and the fair bandwidth control information that comes from the downstream in the burst packets buffer memory, suppress this node or upstream node to the too high data traffic volume of certain destination node, or impel this node or upstream node to increase the data traffic volume to improve the bandwidth utilization rate.
6. the Crossed Circle optical switching system that constitutes by clog-free optical outburst switching loop switching node according to claim 1, it is characterized in that, the temporary transient local burst packets of not having an opportunity to send that described burst packets buffer memory will be finished assembling with burst packets is stored according to the destination address difference, and under the control of burst packets control information processor, the burst packets that can send is sent in the tunable optical transmitter group and is sent.
7. the Crossed Circle optical switching system that constitutes by clog-free optical outburst switching loop switching node according to claim 1, it is characterized in that, described first demodulation multiplexer will come burst packets control information place wavelength to separate from the wavelength of numerous carrying burst packets from the upstream, be sent in the burst packets control information processor; Described tunable optical transmitter is under the control of burst packets control information processor, and the burst packets of selecting suitable wavelengths that assembling is finished sends on certain wavelengths; Described first multiplexer converges to out this light burst packets of encircling, the local upstream stations burst packets of transmitting and the burst packets control information of their correspondences in the optical fiber on the ground.
8. the Crossed Circle optical switching system that constitutes by clog-free optical outburst switching loop switching node according to claim 1, it is characterized in that, described wavelength selectivity memory is made up of the second wavelength sorter, fibre delay line and second multiplexer, the second wavelength sorter has two delivery outlets, one of them delivery outlet uses fibre delay line to be connected to second multiplexer, and the another one delivery outlet then directly connects second multiplexer.
9. the Crossed Circle optical switching system that constitutes by clog-free optical outburst switching loop switching node according to claim 8, it is characterized in that, described fibre delay line, it is the multi-stage fiber delay line, the equal in length of the first order and second level fibre delay line, but every grade of fibre delay line length is longer one times than upper level thereafter, and the length of afterbody fibre delay line is half of memory maximum storage time Len req.
10. the Crossed Circle optical switching system that constitutes by clog-free optical outburst switching loop switching node according to claim 8, it is characterized in that, the described second wavelength sorter comprises: one second demodulation multiplexer, two second multiplexers and array of photoswitch, array of photoswitch is by forming with 1 * 2 optical switch that system uses number of wavelengths to equate, the input port of each 1 * 2 optical switch is connected with second demodulation multiplexer, two delivery outlets of each 1 * 2 optical switch are connected with two second multiplexers respectively, the light signal that contains a plurality of wavelength of importing the second wavelength sorter enters the light signal that second demodulation multiplexer is decomposed into a plurality of single wavelengths and enters 1 * 2 corresponding optical switch respectively, 1 * 2 array of photoswitch is under the control of extraneous control signal, these light signals are divided into two classes output to two second multiplexers respectively, finish the work that the second wavelength sorter becomes the light signal letter sorting of multi-wavelength two classes.
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2005100279383A CN1719944A (en) | 2005-07-21 | 2005-07-21 | Double ring shaped optical exchanging system constituted with non-blocking light burst exchange ring exchange node |
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| CNA2005100279383A CN1719944A (en) | 2005-07-21 | 2005-07-21 | Double ring shaped optical exchanging system constituted with non-blocking light burst exchange ring exchange node |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008003267A1 (en) * | 2006-06-29 | 2008-01-10 | Huawei Technologies Co., Ltd. | An optical burst switching network based burst packet transmitting system and the method thereof |
| CN100478720C (en) * | 2006-06-23 | 2009-04-15 | 北京大学 | Method for solving link configuration and wavelength allocation competed in OBS by using parallel light fiber |
| CN104301027A (en) * | 2013-07-16 | 2015-01-21 | 中兴通讯股份有限公司 | Method, system and node for realizing auto protection switching in Optical Burst-Switching Ring |
| CN107135157A (en) * | 2017-06-23 | 2017-09-05 | 清华大学 | A kind of light wave length exchanging method suitable for space-based light net |
-
2005
- 2005-07-21 CN CNA2005100279383A patent/CN1719944A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100478720C (en) * | 2006-06-23 | 2009-04-15 | 北京大学 | Method for solving link configuration and wavelength allocation competed in OBS by using parallel light fiber |
| WO2008003267A1 (en) * | 2006-06-29 | 2008-01-10 | Huawei Technologies Co., Ltd. | An optical burst switching network based burst packet transmitting system and the method thereof |
| CN104301027A (en) * | 2013-07-16 | 2015-01-21 | 中兴通讯股份有限公司 | Method, system and node for realizing auto protection switching in Optical Burst-Switching Ring |
| WO2015007134A1 (en) * | 2013-07-16 | 2015-01-22 | 中兴通讯股份有限公司 | Method, system, and node for implementing automatic protection switchover in optical burst switch ring |
| US9998212B2 (en) | 2013-07-16 | 2018-06-12 | Zte Corporation | Method, system and node for implementing automatic protection switching in optical burst-switching ring |
| CN107135157A (en) * | 2017-06-23 | 2017-09-05 | 清华大学 | A kind of light wave length exchanging method suitable for space-based light net |
| CN107135157B (en) * | 2017-06-23 | 2018-07-13 | 清华大学 | A kind of light wave length exchanging method suitable for space-based light net |
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