CN101924961A - The multiple size light cross connection device that is used for core nodes of optical burst switching network - Google Patents
The multiple size light cross connection device that is used for core nodes of optical burst switching network Download PDFInfo
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Abstract
The multiple size light cross connection device that is used for core nodes of optical burst switching network, first optical fiber and second optical fiber that comprise many transmission lightwave signals, the control wavelength divides plug-in module, the optical fiber cross-connect matrix, the wavestrip cross-connect matrix, wavelength cross-connect matrix and conversion pool and energy control module; Described optical fiber divides plug-in module to be connected with the optical fiber cross-connect matrix by the control wavelength; The control wavelength divides plug-in module to be connected with described control module, and described optical fiber cross-connect matrix wavestrip multiplexer/demultiplexer is connected with described wavestrip cross-connect matrix; Described wavestrip cross-connect matrix is connected with described wavelength cross-connect matrix by wavelength multiplexer/demodulation multiplexer; Described wavelength cross-connect matrix is connected with described conversion pool; Described conversion pool comprises forward conversion unit and reverse conversion unit.The present invention have the congested ability of clearing up strong, support transmitted in both directions, the more excellent advantage of performance.
Description
Technical field
The invention belongs to light burst-switched (Optical Burst Switching, the core node structure in OBS) network field, especially the OBS network.Be specifically related to be used for multiple size light interconnection (Multi-granularity Optical Cross Connect, MG-OXC) device of OBS network core node.
Technical background
The growth at full speed of data business volume and increasing substantially of Optical Fiber Transmission ability are had higher requirement to switching fabric in the optical-fiber network and switching technology, and therefore multiple size light exchange (MG-OXC) technology arises at the historic moment.No matter from the angle of technology, still from network operator's angle, multiple size light exchange (MG-OXC) technology can both satisfy the demand of network development.Under the double drive in technology and market, many granularity exchange (MG-OXC) technology progressively become the focus of optical communication field.Multiple size light exchange (MG-OXC) Study on Technology focus then concentrates on multiple size light interconnection (MG-OXC) structure Design and research.
Multiple size light cross connecting structure (MG-OXC) reduces the port of switch effectively by introducing the exchanging mechanism of many granularities, saves the cost of switching node and reduces volume, power consumption etc.Compare with traditional OXC, the introducing of optical fiber, wavestrip and wavelength and other granularities can be avoided on the single wavelength granularity the demand of vast capacity completely without the resistance cross matrix among the MG-OXC, thereby reduces the node implementation complexity.And have extensibility preferably, improve the resource utilization of network.
And light burst-switched (OBS) technology also is one of quite potential optical switching network in the next generation network, and its proposition also is in order to increase exchange capacity, to reduce the exchange cost.
The characteristics of light burst-switched (OBS) technology are packet and the independent transmission of control grouping, and they all separate in time with on the channel, and adopt unidirectional resource reservation mechanism, with the crosspoint of light burst packets as minimum.OBS has avoided the difficult point of light packet switching (OPS) technology, requirement to optical switch and light buffer memory reduces, and can be good at supporting paroxysmal Packet Service, and to compare with optical link exchange (OCS) simultaneously, it has improved the flexibility of resource allocation and the utilance of resource again greatly.
Two kinds of different signals are arranged: comprise the control signal of routing iinformation and the data-signal of bearer service in the OBS network.Control information in the control signal need be through the electron process of router, and the not forwarding of light requirement electricity/electric light conversion and electronic router of data-signal is directly being transmitted in the transparent transmission channel end to end.Transmit in a certain specific wavelength channel of control signal in wavelength division multiplexing (WDM) transmission link, the data-signal of each burst is corresponding to a control signal.And control signal transmits prior to data-signal, distributes idle channel by " datagram " or " virtual circuit " route pattern Designated Router, realizes the dynamic assignment of bandwidth resources in the data channel.The processing of bursty data exchange has been simplified in the isolation of data channel and control channel, and control signal length is very short, therefore high speed processing is achieved.
The OBS network is made up of fringe node and two parts of core node.Wherein core node mainly is responsible for routing and switching function.Optical cross connect (OXC) system is the key component of OBS core node, and its performance quality has directly determined the performance of OBS core node, the performance of whole even OBS network.
The OBS technology is conceived to the packet granularity (this fineness number is according to the bag size) in the individual channel, and it transmits by a plurality of IP bags are pooled a BDP bag, thereby reduces the exchange number of times, reduces the exchange pressure of network.And many granularities switching technology is conceived to a plurality of wavelength channels, and it is by carrying out space exchange with homology or with the wavelength channel of purpose is multiplexing in an optical fiber, thereby has reduced the exchange number of times, has reduced the complexity of device.The OBS technology certainly will will further strengthen the exchange capacity of optical communication network with combining of many granularities switching technology, reduces the exchange cost.Therefore, the MG-OXC that designs a stable performance, technology maturation is as OBS server node, has great importance for the practicability of OBS network.
With the immediate prior art of the present invention is to adopt multiple size light switching fabric (the yellow victory of the support burst granularity of cascaded structure, Long Keping, the little dragon of sun etc., support the multiple size light switching fabric research of burst granularity, Chongqing Mail and Telephones Unvi's journal (natural science edition), 19 (1), 2007), yet this structure can only one-way transmission, needs two groups of cross connecting structures could realize transmitted in both directions, thereby has the bigger shortcoming of cost when using this structure establishment OBS network.In addition, this structure does not possess wavelength conversion capability, therefore has bigger congestion ratio, and overall performance is performed poor.
Summary of the invention
Be the bigger shortcoming of one-way transmission, congestion ratio that overcomes MG-OXC of the prior art, the invention provides a kind of congested ability of clearing up strong, support transmitted in both directions, the more excellent multiple size light cross connection device that is used for core nodes of optical burst switching network of performance.
The multiple size light cross connection device that is used for core nodes of optical burst switching network, it is characterized in that: first optical fiber and second optical fiber that comprise many transmission lightwave signals, divide next wavelength signals as control signal and all the other wavelength signals continue to transmit in optical fiber as data-signal in the lightwave signal that will in optical fiber, transmit, or a control signal is inserted into the control wavelength in the data signals transmitted divides plug-in module in the optical fiber, optical fiber cross-connect matrix (FXC), wavestrip cross-connect matrix (BXC), wavelength cross-connect matrix (WXC) and conversion pool and can transmit and exchange described control signal, and the data-signal that the destination interface and the source port of described control signal are analyzed with definite correspondence need carry out the control module that cross coincidence several times goes out the intersection instruction;
Described optical fiber divides plug-in module to be connected with described optical fiber cross-connect matrix (FXC) by described control wavelength; Described first optical fiber is connected with the left side port of described optical fiber cross-connect matrix (FXC), and described second optical fiber is connected with the right side port of described optical fiber cross-connect matrix (FXC); The first control wavelength that is connected with first optical fiber divides plug-in module to pass through first control signal and is connected with described control module, and the second control wavelength that is connected with second optical fiber divides plug-in module to pass through second control signal and is connected with described control module; With data-signal from first optical fiber to second Optical Fiber Transmission as forward transmitted, data-signal from second optical fiber to first Optical Fiber Transmission as reverse transfer;
Described optical fiber cross-connect matrix (FXC) by a plurality of can be that a plurality of wavestrip granularity data signals or the wavestrip multiplexer/demultiplexer that a plurality of wavestrip granularity data signals is reset to an optical fiber granularity signal are connected with described wavestrip cross-connect matrix (BXC) with the lightwave signal demultiplexing in the optical fiber;
Described wavestrip cross-connect matrix (BXC) is a plurality of wavelength granularity data signals with wavestrip granularity data signal demultiplexing or wavelength multiplexer/demodulation multiplexer that a plurality of wavelength granularity data signal multiplexings are a wavestrip granularity signal is connected with described wavelength cross-connect matrix (WXC) by a plurality of;
Described wavelength cross-connect matrix (WXC) is connected with described conversion pool; Described conversion pool comprises forward conversion unit and reverse conversion unit.
Further, described control wavelength divides down, and the insertion unit comprises preceding optical circulator that is connected with described optical fiber and the back optical circulator that is connected with described optical cross-connect matrix, from lightwave signal circulator after splitter transfers to of preceding optical circulator, from the back optical circulator optical fiber granularity data signal transfer to preceding circulator through coupler; Described splitter with the control signal in the lightwave signal divide down the back, with described control signal in the control channel input control module; Control signal by described control module output is imported in the described coupler through control channel;
First, second control wavelength divides the port reversed in order of inserting the optical circulator in the unit down.
Further, the converting unit of described conversion pool comprises first optical circulator, the wavelength Conversion cross-connect matrix, the wavelength shifter that is connected with the output of described wavelength Conversion cross-connect matrix is with second optical circulator that is connected with the output of described wavelength shifter; Described first optical circulator will be imported described wavelength Conversion cross-connect matrix from the output signal of wavelength cross-connect matrix (WXC), and described second optical circulator will be imported in the described wavelength cross-connect matrix (WXC) from the output signal of each wavelength shifter.
Further, first optical circulator of described forward conversion unit is as second optical circulator of described reverse conversion unit; First optical circulator of described reverse conversion unit is as second optical circulator of described forward conversion unit.
Further, described control module comprises with described splitter and being connected, control signal is converted to the light/electric transducer of analog electrical signal, analog electrical signal is converted to the A/D converter of digital electric signal, send after digital electric signal analyzed and intersect the processor of instruction, convert the digital electric signal of processor output the D/A of analog electrical signal to and convert analog electrical signal to light signal and the electric to optic converter of this light signal input coupler.
Further, the analytical procedure of described processor is:
1, the tabulation of optical switch channel status and bid value is set up in initialization;
2, receive the control signal (BCP bag) of the digital electric signal of the interior all forward transmitted imported of certain hour and reverse transfer;
3, source port that obtains its corresponding data-signal and the destination interface that wraps according to described BCP, judge whether to exist the source port of a forward and reverse data signals transmitted and the optical fiber link that destination interface fits like a glove, if, think that then data-signal only needs to carry out the optical fiber layer hand-deliver through optical fiber cross-connect matrix (FXC) and changes, and the output control command forwards step 7 to FXC; Otherwise carry out next step;
4, according to source port in the BCP controlling packet and destination interface, judge whether to exist the source port of a forward and reverse data signals transmitted and the wavestrip link that destination interface fits like a glove, if, think that then data-signal can carry out the exchange of wavestrip aspect, and the output control command forwards step 7 to FXC and BXC; Otherwise carry out next step;
5, judge that the purpose wavelength channel of a wavelength granularity signal is whether idle, if, then think and can the wavelength layer hand-deliver change and export control code to FXC, BXC and WXC, forward step 7 to; If the purpose wavelength channel is not idle, then need one of them data-signal is carried out wavelength Conversion, and the output control command forwards step 7 to FXC, BXC, WXC and WCXC; Otherwise carry out next step;
6, judge with this BCP wrap its corresponding data-signal (BDP bag) whether will take place congested, if then make discard processing;
7, successful output port coding, processing procedure finishes.
Further, the fit like a glove destination interface of the data-signal that is meant all forward transmitted of the source port of forward and reverse data signals transmitted and destination interface is all identical, the destination interface of the data-signal of all reverse transfer is also identical, the destination interface of the data-signal of forward transmitted equals the source port of the data-signal of reverse transfer, and the destination interface of the data-signal of reverse transfer also equals the source port of the data-signal of forward transmitted.
Groundwork flow process of the present invention is: the optical fiber that has only through connect signal is directly by FXC routing output; The optical fiber that contains wavelength exchange channel will be single wavestrip signal by wavestrip demodulation multiplexer demultiplexing then, carry out wavestrip exchange routing output by BXC then, if the exchange requirement is not satisfied in the wavestrip exchange, then demultiplexing is single long wave, export by the WXC routing, can also carry out the wavelength Conversion function as the need wavelength Conversion, be multiplexed in the output optical fibre through wavelength multiplexer and wavestrip multiplexer more at last.Carry out the switching matrix of all necessary elder generation of exchange of lower floor if desired through the upper strata.If signal continues transmission downstream, last signal then need successively return fiber port from lower floor's switching matrix through opposite process.
The present invention adopts and can make light signal along the order port forward transmitted conducting of regulation, the optical circulator of oppositely forbidding, the control wavelength of having built the processing of transmitted in both directions channel separation divides plug-in module and conversion pool, realize the transmitted in both directions of MG-OXC device, thereby saved the node cost.In addition, the bi-directional conversion pond of the uniqueness of the present invention's design has realized the data channel of different transmission directions is separated first in a conversion pool, finishes wavelength Conversion in different wavelength shifter groups respectively then, improve the switching performance of node greatly, reduced congestion ratio.
The present invention have the congested ability of clearing up strong, support transmitted in both directions, the more excellent advantage of performance.
Description of drawings
Fig. 1 is a prior art MG-OXC structure.
Fig. 2 is a MG-OXC structure of the present invention.
Fig. 3 is the cut-away view of control module of the present invention.
Fig. 4 is the analyzing and processing flow chart of FPGA in the control module of the present invention.
Embodiment
The present invention will be further described below in conjunction with accompanying drawing:
The multiple size light cross connection device that is used for core nodes of optical burst switching network, first optical fiber and second optical fiber that comprise many transmission lightwave signals, divide next wavelength signals as control signal and all the other wavelength signals continue to transmit in optical fiber as data-signal in the lightwave signal that will in optical fiber, transmit, or a control signal is inserted into the control wavelength in the data signals transmitted divides plug-in module in the optical fiber, optical fiber cross-connect matrix (FXC), wavestrip cross-connect matrix (BXC), wavelength cross-connect matrix (WXC) and conversion pool and can transmit described control signal, and the data-signal that the destination interface and the source port of described control signal are analyzed with definite correspondence need carry out the control module that cross coincidence several times goes out the intersection instruction;
Described optical fiber divides plug-in module to be connected with described optical fiber cross-connect matrix (FXC) by described control wavelength; Described first optical fiber is connected with the left side port of described optical fiber cross-connect matrix (FXC), and described second optical fiber is connected with the right side port of described optical fiber cross-connect matrix (FXC); The first control wavelength that is connected with first optical fiber divides plug-in module to pass through first control signal and is connected with described control module, and the second control wavelength that is connected with second optical fiber divides plug-in module to pass through second control signal and is connected with described control module; With data-signal from first optical fiber to second Optical Fiber Transmission as forward transmitted, data-signal from second optical fiber to first Optical Fiber Transmission as reverse transfer; Each root optical fiber all divides plug-in module to be connected with a control wavelength;
Described optical fiber cross-connect matrix (FXC) by a plurality of can be that a plurality of wavestrip granularity data signals or the wavestrip multiplexer/demultiplexer that a plurality of wavestrip granularity data signals is reset to an optical fiber granularity signal are connected with described wavestrip cross-connect matrix (BXC) with the lightwave signal demultiplexing in the optical fiber;
Described wavestrip cross-connect matrix (BXC) is a plurality of wavelength granularity data signals with wavestrip granularity data signal demultiplexing or wavelength multiplexer/demodulation multiplexer that a plurality of wavelength granularity data signal multiplexings are a wavestrip granularity signal is connected with described wavelength cross-connect matrix (WXC) by a plurality of;
Described wavelength cross-connect matrix (WXC) is connected with described conversion pool; Described conversion pool comprises forward conversion unit and reverse conversion unit.
Described control wavelength divides down, and the insertion unit comprises preceding optical circulator that is connected with described optical fiber and the back optical circulator that is connected with described optical cross-connect matrix, from lightwave signal circulator after splitter transfers to of preceding optical circulator, from the back optical circulator optical fiber granularity data signal transfer to preceding circulator through coupler; Described splitter with the control signal in the lightwave signal divide down the back, with described control signal in the control channel input control module; Control signal by described control module output is imported in the described coupler through control channel;
First, second control wavelength divides the port reversed in order of inserting the optical circulator in the unit down.
The converting unit of described conversion pool comprises first optical circulator, the wavelength Conversion cross-connect matrix, the wavelength shifter that is connected with the output of described wavelength Conversion cross-connect matrix is with second optical circulator that is connected with the output of described wavelength shifter; Described first optical circulator will be imported described wavelength Conversion cross-connect matrix from the output signal of wavelength cross-connect matrix (WXC), and described second optical circulator will be imported in the described wavelength cross-connect matrix (WXC) from the output signal of each wavelength shifter.
First optical circulator of described forward conversion unit is as second optical circulator of described reverse conversion unit; First optical circulator of described reverse conversion unit is as second optical circulator of described forward conversion unit.
Described control module comprises with described splitter and being connected, control signal is converted to the light/electric transducer of analog electrical signal, analog electrical signal is converted to the A/D converter of digital electric signal, send after digital electric signal analyzed and intersect the processor of instruction, convert the digital electric signal of processor output the D/A of analog electrical signal to and convert analog electrical signal to light signal and the electric to optic converter of this light signal input coupler.
The analytical procedure of described processor is:
1, the tabulation of optical switch channel status and bid value is set up in initialization;
2, receive the control signal (BCP bag) of the digital electric signal of the interior all forward transmitted imported of certain hour and reverse transfer;
3, source port that obtains its corresponding data-signal and the destination interface that wraps according to described BCP, judge whether to exist the source port of a forward and reverse data signals transmitted and the optical fiber link that destination interface fits like a glove, if, think that then data-signal only needs to carry out the optical fiber layer hand-deliver through optical fiber cross-connect matrix (FXC) and changes, and the output control command forwards step 7 to FXC; Otherwise carry out next step;
4, according to source port in the BCP controlling packet and destination interface, judge whether to exist the source port of a forward and reverse data signals transmitted and the wavestrip link that destination interface fits like a glove, if, think that then data-signal can carry out the exchange of wavestrip aspect, and the output control command forwards step 7 to FXC and BXC; Otherwise carry out next step;
5, judge that the purpose wavelength channel of a wavelength granularity signal is whether idle, if, then think and can the wavelength layer hand-deliver change and export control code to FXC, BXC and WXC, forward step 8 to; If the purpose wavelength channel is not idle, then need one of them data-signal is carried out wavelength Conversion, and the output control command forwards step 7 to FXC, BXC, WXC and WCXC; Otherwise carry out next step;
6, judge with this BCP wrap its corresponding data-signal (BDP bag) whether will take place congested, if then make discard processing;
7, successful output port coding, processing procedure finishes.
The fit like a glove destination interface of the data-signal that is meant all forward transmitted of the source port of forward and reverse data signals transmitted and destination interface is all identical, the destination interface of the data-signal of all reverse transfer is also identical, the destination interface of the data-signal of forward transmitted equals the source port of the data-signal of reverse transfer, and the destination interface of the data-signal of reverse transfer also equals the source port of the data-signal of forward transmitted.
In the present embodiment, set two of control channels, wavelength is respectively λ
0, λ
1, data channel is eight, is respectively λ
2, λ
3, λ
4, λ
5, λ
6, λ
7, λ
8, λ
9Described wavelength is λ
0Control channel to be responsible for the forward transmitted wavelength be λ
0The burst control bag, this burst control bag is corresponding to the burst packet of forward transmitted, wavelength may be λ
2, λ
3, λ
4, λ
5, λ
6, λ
7, λ
8, λ
9In any one or a plurality of; Described wavelength is λ
1Control channel be responsible for reverse transfer burst control bag, this burst control bag is corresponding to the burst packet of reverse transfer, wavelength may be λ
2, λ
3, λ
4, λ
5, λ
6, λ
7, λ
8, λ
9In any one or a plurality of.Described λ
2, λ
3, λ
4, λ
5, λ
6, λ
7, λ
8, λ
9Eight data channels are responsible for forward or reverse transfer burst packet, but each wavelength channel can not transmit forward and reverse data-signal simultaneously, but can transmit forward or reverse data-signal respectively in different time sections.
In the present embodiment, setting fiber channel quantity is four.Because transmitted in both directions, the optical fiber at FXC two ends is all input and output.Each needs a control wavelength to divide plug-in module to same fiber channel in the two ends of FXC, and therefore, whole M G-OXC device needs eight control wavelength to divide plug-in module in the present embodiment.Two control wavelength that are arranged in the FXC two ends divide the optical circulator of plug-in module that some difference is arranged, the port reversed in order of two optical circulators, yet these two optical circulators are identical device, the optical circulator that difference is the left side uses that face up, and the use of the optical circulator face down on the right side.During the forward transmitted sets of signals, sets of signals is at first divided plug-in module through the control wavelength on the left side, and sets of signals is by behind the optical circulator, via the branch road transmission with splitter, the λ that wavelength is under splitter punishment in this unit
0Control signal enter control module, all the other signals continue to the right, and transmission enters unit such as FXC, BXC, WXC, conversion pool, by behind one or more in above-mentioned four unit, the control wavelength that is transferred to the right side divides plug-in module, sets of signals is by behind the optical circulator in this unit, via branch road transmission, at the control signal λ of coupler place insertion from control module with coupler
0Process is similar during the reverse transfer sets of signals, and difference is that the control signal wavelength that inserts under the branch is λ
1The control wavelength divides the adding of plug-in module to make MG-OXC realize transmitted in both directions, can save the MG-OXC quantity of half thus in network node, greatly reduces cost.
Described optical fiber cross-connect matrix (FXC) is responsible for the interconnection of the data-signal of optical fiber granularity.In the present embodiment, FXC is one 6 * 6 optical switch matrix, has 12 ports, wherein following eight ports divide plug-in module to be connected with the control wavelength, finally be connected to input/output port, wherein top four are connected with the wavestrip multiplexer/demultiplexer, finally are connected to BXC.When the forward and reverse data signals transmitted in the optical fiber link has the source port that matches and destination interface, promptly the destination interface of the data-signal of all forward transmitted is all identical, the destination interface of the data-signal of all reverse transfer is also identical, the destination interface of the data-signal of forward transmitted equals the source port of the data-signal of reverse transfer, and the destination interface of the data-signal of reverse transfer also equals the source port of the data-signal of forward transmitted.At this moment, belong to pass-through state, only need do the interconnection of optical fiber aspect, FXC only exchanges between the left side port in eight ports and right side port below, and data-signal one is the while transmitted in both directions surely.When having different destination interfaces in the data-signal of forward in the optical fiber link or reverse transfer, it then not pass-through state, at this moment need between left side port in 12 ports and right side port, exchange, with in the port in eight ports in below and the top port or not of homonymy be connected, be connected to the wavestrip demodulation multiplexer, do further exchange at BXC.
Described wavestrip multiplexer/demultiplexer is 1 * 2 wavestrip multiplexer/demultiplexer.Function is to be two wavestrip granularities with eight data wavelength (de) multiplexings in the optical fiber granularity, each wavestrip four wavelength, wherein λ
2, λ
3, λ
4, λ
5And λ
6, λ
7, λ
8, λ
9It respectively is a wavestrip; Or two wavestrip granularities are multiplexed with an optical fiber granularity.
Described wavestrip cross-connect matrix (BXC) is responsible for the interconnection of the data-signal of optical fiber granularity.In the present embodiment, BXC also is 8 * 8 optical switch matrixes with 16 ports, and wherein following eight ports are connected with the wavestrip multiplexer/demultiplexer, and the corresponding λ of four ports is arranged in eight ports
2, λ
3, λ
4, the λ wavestrip, the BXC two ends respectively distribute two, the corresponding λ of four ports
6, λ
7, λ
8, λ
9Wavestrip, BXC two ends also respectively distribute two; Top in addition eight wavelength multiplexer/demodulation multiplexers with two kinds of corresponding different wavestrips are connected, and finally are connected to WXC.When the several wavelength signals in the wavestrip link have the source port that matches and destination interface, belong to pass-through state, only need the interconnection of wavestrip aspect, at this moment BXC only exchanges between left side port in the port of four corresponding wavestrips and right side port below.When having different destination interfaces in the data-signal of forward in the wavestrip link or reverse transfer, it then not pass-through state, at this moment need between left side port in 16 ports and right side port, exchange, with in eight ports of port in eight ports in below and top not the corresponding same wave band edge mouth of homonymy be connected, be connected to wavelength demultiplexer, do further exchange at WXC.
Described wavelength multiplexer/demodulation multiplexer is 1 * 4 wavelength multiplexer/demodulation multiplexer that two kinds of different wavestrips of correspondence are arranged.During as wavelength demultiplexer, but their demultiplexings are from the data-signal of different wavestrips.Four wavelength demultiplexers go out two groups of identical channel group with demultiplexing, and every group all has eight wavelength granularity channels, and wavelength is respectively λ
2, λ
3, λ
4, λ
5, λ
6, λ
7, λ
8, λ
9They are respectively with λ during as wavelength multiplexer
2, λ
3, λ
4, λ
5Four wavelength granularities and λ
6, λ
7, λ
8, λ
9Four wavelength granularities are multiplexed with two wavestrip granularities.
Described wavelength cross-connect matrix (WXC) is responsible for the interconnection of the data-signal of wavelength granularity.In the present embodiment, BXC also is 24 * 24 optical switch matrixes with 48 ports, 32 ports are connected with wavelength multiplexer/demodulation multiplexer wherein, and respectively there is the port of eight wavelength granularity channels of two groups of correspondences both sides, can interconnection between the port of same wave long channel; 16 ports are connected with conversion pool in addition.When the purpose passage of a wavelength signals is idle, when not needing to make wavelength Conversion, belong to pass-through state, only need the interconnection of wavelength aspect, at this moment WXC only below four in 32 ports to exchanging between left side port that should wavelength and right side port.When a wavelength signals need be made wavelength Conversion, then not pass-through state, the port of corresponding this wavelength of homonymy not above at this moment needing port is cross connected to is connected to conversion pool and makes wavelength Conversion.
Described conversion pool comprises optical circulator, wavelength shifter and is connected the optical cross-connect matrix (WCXC) of wavelength shifter.In the present embodiment, the optical cross-connect matrix of two connection wavelength shifters (WCXC) all is 8 * 8 optical switch matrixes with 16 ports, and two groups of wavelength shifters respectively have eight wavelength shifters, corresponding λ
2, λ
3, λ
4, λ
5, λ
6, λ
7, λ
8, λ
9Eight wavelength.When the data-signal forward transmitted, behind optical circulator,, do interconnection among the WCXC in the branch road up via the top branch road, be connected to the wavelength shifter port of the purpose wavelength correspondence that need convert to after the exchange, be connected to wavelength multiplexer via optical circulator at last.When the data-signal reverse transfer, behind optical circulator, via the below branch road, below do interconnection among the WCXC in the branch road, be connected to the wavelength shifter port of the purpose wavelength correspondence that need convert to after the exchange, be connected to wavelength multiplexer via optical circulator at last.Described conversion pool makes the mode of the data separating of different transmission directions to different branch by using optical circulator, the mode of making one-way transmission at each branch road has realized that conversion pool integral body has possessed the ability of bi-directional conversion wavelength, thereby improved the network performance of two-way MG-OXC, reduced congestion ratio.
Processor adopting field programmable gate array (FPGA) system of present embodiment.Light/electric transducer is responsible for converting control signal to analog electrical signal from light signal, electric to optic converter is responsible for converting control signal to light signal from analog electrical signal, A/D converter is responsible for converting analog electrical signal to digital electric signal, D/A is responsible for converting digital electric signal to analog electrical signal, the FPGA system is responsible for the analysis and the exchange of the control signal of digital electric signal state, and the control signal of the optical cross-connect matrix in output FXC, BXC, WXC and the conversion pool.
In the present embodiment, respectively there are eight ports the control module both sides, have 16 ports.Two kinds of processing modules of inner atmosphere are handled the BCP signal of different transmission directions respectively, and each processing module comprises a FPGA system, four light/electric transducers, four electric to optic converters, four A/D converters and four D/As.The BCP signal is after the input input, convert analog electrical signal to through light/electric transducer, convert digital electric signal to through A/D converter again, be transferred to the FPGA processing that performs an analysis, and the FPGA port that exchanges to purpose optical fiber correspondence is exported, D/A and electric to optic converter convert the BCP light signal to then, are transferred to the control wavelength at last and divide plug-in module.
Groundwork flow process of the present invention is: the optical fiber that has only through connect signal is directly by FXC routing output; The optical fiber that contains wavelength exchange channel will be single wavestrip signal by wavestrip demodulation multiplexer demultiplexing then, carry out wavestrip exchange routing output by BXC then, if the exchange requirement is not satisfied in the wavestrip exchange, then demultiplexing is single long wave, export by the WXC routing, can also carry out the wavelength Conversion function as the need wavelength Conversion, be multiplexed in the output optical fibre through wavelength multiplexer and wavestrip multiplexer more at last.Carry out the switching matrix of all necessary elder generation of exchange of lower floor if desired through the upper strata.If signal continues transmission downstream, last signal then need successively return fiber port from lower floor's switching matrix through opposite process.
The present invention is by adding optical circulator in the structure of MG-OXC device, the control wavelength of having built the processing of transmitted in both directions channel separation divides plug-in module and conversion pool, has realized the transmitted in both directions of MG-OXC device, thereby has saved the node cost.In addition, the bi-directional conversion pond of the uniqueness of the present invention's design has realized the data channel of different transmission directions is separated first in a conversion pool, finishes wavelength Conversion in different wavelength shifter groups respectively then, improve the switching performance of node greatly, reduced congestion ratio.
The described content of this specification embodiment only is enumerating the way of realization of inventive concept; protection scope of the present invention should not be regarded as only limiting to the concrete form that embodiment states, protection scope of the present invention also reach in those skilled in the art conceive according to the present invention the equivalent technologies means that can expect.
Claims (7)
1. the multiple size light cross connection device that is used for core nodes of optical burst switching network, it is characterized in that: first optical fiber and second optical fiber that comprise many transmission lightwave signals, divide next wavelength signals as control signal and all the other wavelength signals continue to transmit in optical fiber as data-signal in the lightwave signal that will in optical fiber, transmit, or a control signal is inserted into the control wavelength in the data signals transmitted divides plug-in module in the optical fiber, optical fiber cross-connect matrix (FXC), wavestrip cross-connect matrix (BXC), wavelength cross-connect matrix (WXC) and conversion pool and can transmit and exchange described control signal, and the data-signal that the destination interface and the source port of described control signal are analyzed with definite correspondence need carry out the control module that cross coincidence several times goes out the intersection instruction;
Described optical fiber divides plug-in module to be connected with described optical fiber cross-connect matrix (FXC) by described control wavelength; Described first optical fiber is connected with the left side port of described optical fiber cross-connect matrix (FXC), and described second optical fiber is connected with the right side port of described optical fiber cross-connect matrix (FXC); The first control wavelength that is connected with first optical fiber divides plug-in module to pass through first control signal and is connected with described control module, and the second control wavelength that is connected with second optical fiber divides plug-in module to pass through second control signal and is connected with described control module; With data-signal from first optical fiber to second Optical Fiber Transmission as forward transmitted, data-signal from second optical fiber to first Optical Fiber Transmission as reverse transfer;
Described optical fiber cross-connect matrix (FXC) by a plurality of can be that a plurality of wavestrip granularity data signals or the wavestrip multiplexer/demultiplexer that a plurality of wavestrip granularity data signals is reset to an optical fiber granularity signal are connected with described wavestrip cross-connect matrix (BXC) with the lightwave signal demultiplexing in the optical fiber;
Described wavestrip cross-connect matrix (BXC) is a plurality of wavelength granularity data signals with wavestrip granularity data signal demultiplexing or wavelength multiplexer/demodulation multiplexer that a plurality of wavelength granularity data signal multiplexings are a wavestrip granularity signal is connected with described wavelength cross-connect matrix (WXC) by a plurality of;
Described wavelength cross-connect matrix (WXC) is connected with described conversion pool; Described conversion pool comprises forward conversion unit and reverse conversion unit.
2. the multiple size light cross connection device that is used for core nodes of optical burst switching network as claimed in claim 1, it is characterized in that: insert the unit under described control wavelength divides and comprise preceding optical circulator that is connected with described optical fiber and the back optical circulator that is connected with described optical cross-connect matrix, from lightwave signal circulator after splitter transfers to of preceding optical circulator, from the back optical circulator optical fiber granularity data signal transfer to preceding circulator through coupler; Described splitter with the control signal in the lightwave signal divide down the back, with described control signal in the control channel input control module; Control signal by described control module output is imported in the described coupler through control channel; First, second control wavelength divides the port reversed in order of inserting the optical circulator in the unit down.
3. the multiple size light cross connection device that is used for core nodes of optical burst switching network as claimed in claim 2, it is characterized in that: the converting unit of described conversion pool comprises first optical circulator, the wavelength Conversion cross-connect matrix, the wavelength shifter that is connected with the output of described wavelength Conversion cross-connect matrix is with second optical circulator that is connected with the output of described wavelength shifter; Described first optical circulator will be imported described wavelength Conversion cross-connect matrix from the output signal of wavelength cross-connect matrix (WXC), and described second optical circulator will be imported in the described wavelength cross-connect matrix (WXC) from the output signal of each wavelength shifter.
4. the multiple size light cross connection device that is used for core nodes of optical burst switching network as claimed in claim 3 is characterized in that: first optical circulator of described forward conversion unit is as second optical circulator of described reverse conversion unit; First optical circulator of described reverse conversion unit is as second optical circulator of described forward conversion unit.
5. the multiple size light cross connection device that is used for core nodes of optical burst switching network as claimed in claim 4, it is characterized in that: described control module comprises with described splitter and being connected, control signal is converted to the light/electric transducer of analog electrical signal, analog electrical signal is converted to the A/D converter of digital electric signal, send after digital electric signal analyzed and intersect the processor of instruction, the digital electric signal of processor output is converted to the D/A of analog electrical signal and converts analog electrical signal to light signal, and with the electric to optic converter of this light signal input coupler.
6. the multiple size light cross connection device that is used for core nodes of optical burst switching network as claimed in claim 5, it is characterized in that: the analytical procedure of described processor is:
1), initialization, set up optical switch channel status and bid value the tabulation;
2), receive the control signal (BCP bag) of the digital electric signal of the interior all forward transmitted imported of certain hour and reverse transfer;
3), source port that obtains its corresponding data-signal and the destination interface that wraps according to described BCP, judge whether to exist the source port of a forward and reverse data signals transmitted and the optical fiber link that destination interface fits like a glove, if, think that then data-signal only needs to carry out the optical fiber layer hand-deliver through optical fiber cross-connect matrix (FXC) and changes, and the output control command forwards step 7 to FXC; Otherwise carry out next step;
4), according to source port in the BCP controlling packet and destination interface, judge whether to exist the source port of a forward and reverse data signals transmitted and the wavestrip link that destination interface fits like a glove, if, think that then data-signal can carry out the exchange of wavestrip aspect, and the output control command forwards step 7 to FXC and BXC; Otherwise carry out next step;
5), judge that the purpose wavelength channel of a wavelength granularity signal is whether idle, if, then think and can the wavelength layer hand-deliver change and export control code to FXC, BXC and WXC, forward step 7 to; If the purpose wavelength channel is not idle, then need one of them data-signal is carried out wavelength Conversion, and the output control command forwards step 7 to FXC, BXC, WXC and WCXC; Otherwise carry out next step;
6), judge with this BCP wrap its corresponding data-signal (BDP bag) whether will take place congested, if then make discard processing;
7), successful output port is encoded the processing procedure end.
?
7. the multiple size light cross connection device that is used for core nodes of optical burst switching network as claimed in claim 6, it is characterized in that: the fit like a glove destination interface of the data-signal that is meant all forward transmitted of the source port of forward and reverse data signals transmitted and destination interface is all identical, the destination interface of the data-signal of all reverse transfer is also identical, the destination interface of the data-signal of forward transmitted equals the source port of the data-signal of reverse transfer, and the destination interface of the data-signal of reverse transfer also equals the source port of the data-signal of forward transmitted.
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| US20060209849A1 (en) * | 2003-08-14 | 2006-09-21 | Rodrigo Miguel D V | Method for and apparatus for aggregating incoming packets into optical for an optical burst switched network |
| CN201846454U (en) * | 2010-07-19 | 2011-05-25 | 浙江工业大学 | Multi-granularity optical cross connection device for optical burst switching network core node |
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| US20060209849A1 (en) * | 2003-08-14 | 2006-09-21 | Rodrigo Miguel D V | Method for and apparatus for aggregating incoming packets into optical for an optical burst switched network |
| CN1717113A (en) * | 2004-07-02 | 2006-01-04 | 电子科技大学 | Photoelectric mixed exchanging struture supporting light burst/group exchanging |
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