CN101783972B - Optical-packet full switch method, system and device - Google Patents
Optical-packet full switch method, system and device Download PDFInfo
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- CN101783972B CN101783972B CN 200910076750 CN200910076750A CN101783972B CN 101783972 B CN101783972 B CN 101783972B CN 200910076750 CN200910076750 CN 200910076750 CN 200910076750 A CN200910076750 A CN 200910076750A CN 101783972 B CN101783972 B CN 101783972B
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Abstract
The invention discloses an optical-packet full switch method, a system and a device. The method comprises the following steps: A, a source edge router converts data at the IP layer into net load, OCDM coding is carried out on optical signals carrying the net load to form an optical packet with an OCDM tab code, and the optical packet is transmitted; B, a core router receiving the optical packet decodes the OCDM tab code, if decoding is successful, the net load in the optical packet is recovered, the next hop router is utilized to newly perform OCDM coding on the recovered net load to form an optical packet with a new OCDM tab code, and then the optical packet is transmitted; C, if the router which receives the optical packet is still a core router, the operation executed by the core router in step B is executed continuously until a destination edge router receives the optical packets. By adopting the invention, optical signals do not need to be buffered by an optical buffer, thus avoiding the problems of extra exhaustion brought by buffering optical signals.
Description
Technical field
The present invention relates to optical communication technique, particularly a kind of full switch method, system and device of light grouping.
Background technology
At present, development along with dense wave division multipurpose (DWDM:Dense Wavelength DivisionMultiplexing) technology, the transmission capacity of optical communication increases greatly, it has reached the order of magnitude of per second terabyte (Tb/s), has greatly satisfied the demand of data message aspect transmission.
But, in the core switching network, in order to realize the forwarding of data message, indispensable switching method is still traditional light switching method of carrying out light-electrical-optical conversion in the optical communication technique, this light switching method specifically can comprise: after core router receives DWDM light signal from the source edge router, this DWDM light signal is converted to the corresponding signal of telecommunication, and in electric territory this signal of telecommunication of storage, wherein, this source edge router is used for converging the data from the IP layer.Here, DWDM optical signals packet header and payload two parts form, and wherein, comprise the destination address of light signal in the packet header, and comprise the communication data that arrives this destination address in the payload.Afterwards, core router reads the destination address that this signal of telecommunication comprises, and searches the down hop route in pre-stored routing table; When finding the down hop route, above-said current signal is converted to corresponding DWDM light signal again, and this light signal is sent to down hop.If this down hop also is core router, then this core router continues to press the aforesaid operations execution, until arrive till the purpose edge router.At last, this purpose edge router sends to light signal the user terminal of destination address.
As seen, in the above-mentioned smooth switching method, after core router receives the DWDM light signal, all need the packet header and the payload that comprise in the DWDM light signal that receives are carried out light-electrical-optical conversion at every turn, like this, greatly wasted the time of optical signal transmission.
Light packet switching (OPS:Optical Packet Switching) is the effective scheme that addresses the above problem, the technical schemes such as existing signal exchange of present stage (OLS:Optical Label Switching) and light burst-switched (OBS:Optical Burst Switching), wherein the signal exchange is above-mentionedly carried out light-electrical-optical to the payload in the DWDM light signal and is converted into most typical a kind of switching method in the present light packet switching owing to need not.The signal switching method mainly is that the least unit light when utilizing optical signal transmission divides into groups to come transmitting optical signal, carry payload and signal in this light grouping, wherein comprise the destination address that payload will arrive in the signal, comprise the communication data that arrives this destination address in the payload.After core router receives from the grouping of the light of source edge router, because that is that all right is ripe in the at present development of core router, core router can't identify the signal information in this light grouping, therefore signal need to be converted to the signal of telecommunication, this signal of telecommunication of storage in electric territory, and utilize the temporarily payload in the grouping of buffer memory light in the light territory of optical buffer.Then, read the destination address that comprises in this signal of telecommunication, in the routing table that self stores, find the down hop route; Afterwards, above-said current signal is converted to signal again, and the payload of this optical buffer buffer memory and this signal be carried in the light grouping send, if this down hop also is core router, then this core router is pressed aforesaid operations continuation execution, until arrive till the purpose edge router.
As seen, in the above-mentioned signal switching method, although realized payload not being carried out light-electrical-optical conversion, but also need signal is carried out light-electrical-optical conversion, so existing signal switching method is the photoelectric hybrid packet switching, still do not realize the full light exchange in the core switching network, also can cause the time of optical signal transmission to increase owing to signal being carried out light-electrical-optical conversion, and, present optical buffer spare is also immature, with payload temporarily in the light territory storage can cause light signal to have the problems such as extra loss and noise.
In order to give full play to the advantage of optical communication, a kind of being conducive to the light grouping exchange method of the multi-wavelength mark mode of all optical communication transition appearred at present, in the method, need not above-mentioned signal to be carried out the conversion of light-electrical-optical.Particularly, in this light grouping exchange method, optical packet head (being equivalent to signal) and payload have been carried in the light grouping, wherein, optical packet head and payload have precedence in time domain, separate, optical packet head is had the different wave length pulse and is formed by some, the different routing iinformation of various combination representative of wavelength, so, if optical packet head is later than payload and arrives core router, when then core router receives payload, in the light territory, utilize first this payload of buffer buffer memory, when receiving optical packet head, understand the routing iinformation in this optical packet head, and produce new optical packet head according to next bar route, afterwards, this optical packet head and payload are sent, if down hop also is core router, then this core router is pressed aforesaid operations continuation execution, until arrive till the purpose edge router.
As seen, in the above-mentioned light grouping exchange method, although realized payload and signal not being carried out light-electrical-optical conversion, but, because optical packet head and payload have precedence in time domain, separate, there is delay in time in the transmission that is optical packet head and payload, so, just need core router to utilize buffer buffer memory payload or optical packet head, so also can cause owing to buffer memory payload or optical packet head in the light territory cause light signal to have extra loss and noise problem.
Summary of the invention
The invention provides a kind of full switch method, system, source edge router and core router of light grouping, need not optical buffer buffer memory light signal, avoid extra loss and the noise problem brought owing to the buffer memory light signal.
A kind of full switch method of light grouping comprises:
A, the source edge router is converted to payload with the data of IP layer, and this payload is carried on the light signal, and the light signal that has carried payload is carried out Optical Code Division Multiplexing OCDM coding, and forms the light grouping with the OCDM flag code, sends this light grouping;
B, the core router that receives the light grouping is decoded to the OCDM flag code of this light grouping, if successfully decoded, then in the light territory, recover the payload in this light grouping, and utilize the down hop route that self obtains that this payload that recovers is re-started the OCDM coding, and form another with the light grouping of OCDM flag code, send this light grouping;
C, if receive the grouping of this light still be core router, then this core router is proceeded by the performed operation of core router among the step B, until the purpose edge router receives till the described light grouping.
A kind of full optical switching system of light grouping comprises: source edge router, more than one core router and purpose edge router; Wherein,
Described source edge router is used for the data of IP layer are converted to payload, and this payload is carried on the light signal, and this light signal that has carried payload is carried out the OCDM coding, and forms the light grouping with the OCDM flag code, sends this light grouping;
When described core router receives described light grouping, OCDM flag code to this light grouping is decoded, if successfully decoded, then recover the payload in this light grouping, and utilize the down hop route that self obtains that this payload that recovers is re-started the OCDM coding, form another with the light grouping of OCDM flag code, send this light grouping;
Described purpose edge router is used for after receiving the light grouping, recovers the light grouping of reception, and sends this light that recovers and divide into groups to destination address.
One provenance edge router comprises: edge wideband light source, the first edge data modulator, edge OCDM encoder and transmitting element, wherein;
Described edge wideband light source is for generation of light signal;
The first edge data modulator is used for the data of IP layer are converted to payload, the payload after this conversion is carried on the light signal of described wideband light source generation;
Described edge OCDM encoder is used for this light signal that has carried payload is carried out the OCDM coding;
Described transmitting element is used for after described edge OCDM encoder is finished the OCDM coding, forms the light grouping with the OCDM flag code, sends this light grouping.
A kind of core router comprises: more than one full optical correlator, with threshold value decision device and the OCDM flag code converter of the corresponding connection of described full optical correlator, wherein;
Described full optical correlator is used for receiving the light grouping with the OCDM flag code, and the OCDM flag code in the light grouping that receives is decoded, and the id signal after the output decoding is given coupled threshold value decision device;
Described threshold value decision device is used for receiving the id signal of coupled full optical correlator output, judge whether this id signal satisfies default judgment condition, if, then determine coupled full optical correlator successfully decoded, in the light territory, recover the payload in this light grouping, send this payload that recovers to described OCDM flag code converter;
Described OCDM flag code converter is used for receiving this payload that recovers, and utilizes the down hop route that self obtains that this payload that recovers is re-started the OCDM coding, forms another with the light grouping of OCDM flag code, sends this light grouping.
As can be seen from the above technical solutions, the full switch method of light grouping provided by the invention, system, source edge router and core router, compared with prior art, because the source edge router is converted to payload with the data of IP layer, this payload is carried on the light signal, afterwards, this light signal that has carried the payload after the conversion is carried out the OCDM coding, namely, make payload directly carry the OCDM flag code, this can guarantee that payload and OCDM flag code reach synchronous in time, unlike making payload and OCDM flag code in time domain separately in the prior art, and then do not need in the prior art separately to adopt in time domain owing to payload and OCDM flag code the operation of buffer buffer memory payload or signal, thereby do not have in the prior art problems such as the extra loss using optical buffer and bring and noise, Effective Raise the throughput of network.
Further, core router in the core switching network is decoded to the OCDM flag code in the light territory, in the situation of successfully decoded, recover payload, afterwards, read the destination address information that comprises in the payload, determine the down hop route according to this destination address information, utilize this down hop route that this payload that recovers is re-started the OCDM coding, make this payload carry again new OCDM flag code, this payload is modulated into the light grouping, this light grouping is sent, still be core router if receive the down hop of this light grouping, then this core router is still pressed the aforesaid operations execution, until arrive the purpose edge router, as seen, the performed all operations of core router all carries out in the light territory, has realized the full switch method of light grouping, greatly reduces the time of optical signal transmission.
Description of drawings
The flow chart of the full switch method that the light that Fig. 1 provides for the embodiment of the invention divides into groups;
The system construction drawing of the full light exchange that the light that Fig. 2 provides for the embodiment of the invention divides into groups;
The structural representation of the OCDM flag code converter that Fig. 3 provides for the embodiment of the invention.
Embodiment
In order to make technical scheme of the present invention clearer, below with specific embodiment full switch method of the present invention is described in detail by reference to the accompanying drawings first.
In the full switch method of the light grouping that the embodiment of the invention provides, mainly be to utilize exchanging in conjunction with the full light of realization of Optical Code Division Multiplexing (OCDM:Optical Code Division Multiplexing) technology and optical packet switching technique.Particularly, the source edge router is converted to payload with the data of IP layer, wherein, comprise destination address information in the payload after this conversion, this payload is carried on the light signal, the light signal that has carried payload is carried out the OCDM coding, make payload directly carry the OCDM flag code, afterwards, form the light grouping with OCDM flag code, send this light grouping; The core router that receives the light grouping is decoded to the OCDM flag code in this light grouping, if successfully decoded, then in the light territory, recover payload, and extract this OCDM flag code information, according to the destination address information that comprises in the payload that recovers, determine the down hop route, afterwards the payload that recovers is re-started the OCDM coding, make this payload carry again new OCDM flag code, then form the light grouping with this OCDM flag code, send this light grouping; Also be core router if receive the down hop of this light grouping, then this core router is still proceeded according to the above-mentioned performed operation of core router that receives the light grouping, until the purpose edge router receives till the light grouping.
Here, be converted in the step of payload in the data of source edge router with the IP layer, the source edge router can converge the data from the IP layer, preferably, the source edge router is to converging from the IP layer and for the data of same destination address, then the data that converge are converted to payload, the operation that specifically how data is converted to payload can be similar with the conversion of prior art, repeats no more here.
Here, the source edge router carries out the OCDM coding to the light signal that has carried payload can multiple implementation, such as, set in advance the OCDM code word of corresponding each route, determine the down hop route according to the destination address information that comprises in the payload, utilize OCDM code word corresponding to this down hop route that the light signal that has carried payload is carried out OCDM coding etc., present embodiment does not limit this.
In addition, above-mentioned OCDM flag code is an orthogonal code, has autocorrelation and cross correlation, and this OCDM flag code can be one dimension code, two-dimension code or multidimensional code, specifically can decide according to coded system.
Below the full switch method of realization light grouping that present embodiment is provided be described in detail.
Referring to Fig. 1, the full switch method flow chart that the realization light that Fig. 1 provides for the embodiment of the invention divides into groups.Wherein, the full switch method that provides of the embodiment of the invention is applied to comprise in the optical communication network of source edge router, above core router and purpose edge router; When the source edge router receives data from the IP layer, wherein, comprise the destination address information that will arrive in the data of this IP layer, afterwards, these data are converted to payload, owing to comprise the destination address information that will arrive in the data of IP layer, therefore, the also corresponding destination address information that will arrive that comprises in the payload that obtains after the conversion, then as shown in Figure 1, this flow process can may further comprise the steps:
Step 101, the source edge router produces light signal, and the payload after the conversion is carried on this light signal.
Here, the light signal that the source edge router produces is generally multiple wavelength optical signal, as comprising wavelength X
1To λ
7
In addition, in this step, the payload after the conversion is carried on this light signal and specifically can be: the payload after will changing is modulated on the light signal.
Step 102, the source edge router is determined the down hop route according to the destination address information that comprises in this payload.
In this step, to be the source edge router adopt shortest path first to calculate according to the destination address information that comprises in the payload after the conversion to this down hop route, and the method for calculating down hop route is similar in concrete and the prior art, and present embodiment repeats no more.
In addition, above-mentioned down hop route is the route that the source edge router arrives down hop, and usually, the down hop of source edge router is core router.
Step 103, the source edge router is according to OCDM code word corresponding to route selecting of determining in the step 102.
In the present embodiment, set in advance the corresponding relation between route and OCDM code word, so, step 103 specifically can be: source edge router definite corresponding OCDM code word of route in the selecting step 102 from the corresponding relation of the route that sets in advance and OCDM code word.Here, the OCDM code word of choosing can be wavelength, such as, if the source edge router is wavelength amplitude coding (SAC:Spectral Amplitude Coding) to the mode that the light signal that has carried the payload after the conversion carries out the OCDM coding, the wavelength that has carried the light signal of the payload after the conversion comprises λ
1To λ
7, the down hop route of determining in the step 102 is A, then chooses OCDM code word corresponding to A in this step from the corresponding relation of the route that sets in advance and OCDM code word, as to choose OCDM code word corresponding to A be { λ
1, 0,0, λ
4, 0,0, λ
7, 0,0}.Certainly, in the present embodiment, the OCDM code word also has other various ways, as is the different combinations such as time, polarization, and present embodiment does not specifically limit.
Step 104 utilizes the OCDM code word of choosing that the light signal that has carried the payload after the conversion is carried out the OCDM coding, forms the payload with the OCDM flag code.
Here, the down hop route of determining in the corresponding step 102 of above-mentioned OCDM flag code.
So far, realized making the operation of directly carrying the OCDM flag code in the payload.
Step 105, the source edge router is modulated into the light grouping with the payload that forms in the step 104, sends this light grouping.
Here, the light grouping is the least unit of transmitting optical signal in the core switching network, such as, if the payload size that forms in the step 104 is 1M, and the size of light grouping is 200K, then edge router is divided into 5 light groupings with the payload that forms in this step 104, then, in the core switching network this light grouping is sent successively.
Step 106, the core router that receives the light grouping is decoded to the OCDM flag code in this light grouping, if successfully decoded, then execution in step 107, otherwise, process ends.
Here, in the step 106 the OCDM flag code in this light grouping is decoded, it in fact also is the OCDM flag code in the identification bright dipping grouping, particularly, whether the OCDM flag code that can judge this light grouping mates with the relevant parameter that pre-sets, wherein, the described relevant parameter that pre-sets is corresponding with the OCDM code word of carrying out choosing when OCDM encodes; If so, then determine this core router successfully decoded, otherwise definite this core router is decoded unsuccessfully.
Step 107 is recovered the payload in the bright dipping grouping in the light territory, read the destination address information that this payload comprises.
So, realized the directly payload in the recovery bright dipping grouping in the light territory by above-mentioned steps.
Step 108 is determined the down hop route according to the destination address information that reads.
Particularly, the down hop route of determining in this step is according to the above-mentioned destination address information that reads, required process and idle route in the shortest path when adopting shortest path first to determine to arrive this destination address, the method of definite route is similar in concrete and the prior art, repeats no more here.
Step 109 is chosen the corresponding OCDM code word of the down hop route of determining with step 108.
Here, step 109 specifically can be: the corresponding OCDM code word of route of determining in the selecting step 108 from the corresponding relation of the route that sets in advance and OCDM code word.
Step 110, the OCDM code word of utilizing step 109 to choose re-starts the OCDM coding to the payload that recovers, and forms the payload with new OCDM flag code.
Here, need to prove, the payload that recovers in the step 107 also is to be carried on the light signal, just this optical signals may cause decay in transmission in the core switching network, therefore, and preferably, can further comprise in the step 107: produce light signal, wherein, this light signal can be multiple wavelength optical signal, and the payload that recovers is modulated in this light signal; Afterwards, execution in step 108 and step 109; Step 110 specifically can be: the OCDM code word of utilizing step 109 to choose re-starts the OCDM coding to the light signal of having modulated the payload that recovers, formation is with the payload of new OCDM flag code, wherein, the down hop route determined of the corresponding step 108 of this OCDM flag code.
Step 111 is modulated into the light grouping with the payload with new OCDM flag code that forms in the step 110, and this light grouping is sent to the core switching network.
Step 112, the core router that receives this light grouping still continues to carry out by the operation in the step 106, until the purpose edge router receives till the light grouping.
So far, realized the full switch method that present embodiment provides.
Need to prove, after the purpose edge router receives the light grouping, recover this light grouping, and the light grouping that this recovers is sent to the terminal of destination address.
More than be the detailed description that full switch method provided by the present invention is carried out, the below is described in detail full optical switching system provided by the present invention.
Referring to Fig. 2, the system construction drawing of the full light exchange that the realization light that Fig. 2 provides for the embodiment of the invention divides into groups, as shown in Figure 2, this system can comprise: source edge router 201, more than one core router 202 and purpose edge router 203.
Wherein, source edge router 201 is used for the data of IP layer are converted to payload, and this payload is carried on the light signal, and this light signal that has carried the payload after the conversion is carried out the OCDM coding, forms the light grouping with the OCDM flag code, sends this light grouping.
For each core router, if core router receives the light grouping, then the OCDM flag code in this light grouping is decoded, when successfully decoded, recover the payload in the bright dipping grouping, and utilize the down hop route that self obtains that this payload that recovers is re-started the OCDM coding, formation afterwards, sends this light grouping with the light grouping of another OCDM flag code, for drawing conveniently, Fig. 2 is to only have a core router as example.
Preferably, as shown in Figure 2, source edge router 201 can comprise: edge wideband light source 2011, the first edge data modulator 2012, edge OCDM encoder 2013 and transmitting element 2014.
Wherein, edge wideband light source 2011 is for generation of light signal, and the light signal of this generation can be multiple wavelength optical signal.
The first edge data modulator 2012 is used for the data of IP layer are converted to payload, the payload after this conversion is carried on the light signal of edge wideband light source 2011 generations.Particularly, the first edge data modulator 2012 converges the data from the IP layer, afterwards, the data of this IP layer is converted to payload, and the payload that obtains after this conversion is modulated on the light signal that edge wideband light source 2011 produces.
Transmitting element 2014 is used for after edge OCDM encoder 2013 is finished the OCDM coding, forms the light grouping with the OCDM flag code, sends this light grouping.
Preferably, comprise destination address information in the payload after the above-mentioned conversion.
The destination address information that comprises in the payload of OCDM encoder 2013 after according to this conversion is determined the down hop route, choose OCDM code word corresponding to definite down hop route, utilize this OCDM code word of choosing that the light signal of having modulated the payload after the conversion is carried out the OCDM coding, form the payload with the OCDM flag code.
As shown in Figure 2, transmitting element 2014 can comprise: the second edge data modulator 2015 and edge-light amplifier 2016.
Wherein, the second edge data modulator 2015 is used for the payload with the OCDM flag code that edge OCDM encoder 2013 forms is modulated into the light grouping.
Edge-light amplifier 2016 is connected to the output port of the second edge data modulator 2015, and the light grouping that is used for the second edge data modulator 2015 is modulated into is amplified, and the light that sends after this amplifications divides into groups.
During the core router specific implementation, multiple implementation can be arranged, as shown in Figure 2, this core router can comprise: more than one full optical correlator 2021, with threshold value decision device 2022 and the OCDM flag code converter 2023 of the complete corresponding connection of optical correlator, wherein, the number of threshold value decision device is identical with the number of full optical correlator, and the threshold value decision device that each full optical correlator is corresponding with it links to each other.
Wherein, each full optical correlator is used for receiving the light grouping with the OCDM flag code, and the OCDM flag code in the light grouping of this reception is decoded, and the id signal after the output decoding is given coupled threshold value decision device.
The OCDM flag code is orthogonal code in the present embodiment, have autocorrelation and cross correlation, particularly, when the OCDM flag code that the light that receives when full optical correlator divides into groups mates with the relevant parameter that pre-sets, then the id signal after the decoding of this full optical correlator output is high-intensity self correlated peak, otherwise the id signal after the decoding of this full optical correlator output is low intensive cross-correlation interference.
Each threshold value decision device is used for receiving the id signal of coupled full optical correlator output, and judge whether this id signal satisfies default judgment condition, if, then determine coupled full optical correlator successfully decoded, in the light territory, recover the payload in the bright dipping grouping, send this payload that recovers to OCDM flag code converter 2023.
Particularly, when the threshold value decision device is high-intensity self correlated peak at the id signal that receives coupled full optical correlator output, adjudicating this signal identification value is 1, judge this id signal and satisfy default judgment condition, when the id signal after the decoding that receives coupled full optical correlator output is low intensive cross-correlation interference, then adjudicating this signal identification value is 0, judges this id signal and does not satisfy default judgment condition.
OCDM flag code converter 2023 is used for receiving the payload that recovers, and utilizes the down hop route that self obtains that this payload that recovers is re-started the OCDM coding, forms another with the light grouping of OCDM flag code, sends this light grouping.
Preferably, as shown in Figure 2, this core router also can comprise: light-operated smooth crosspoint 2024.
Wherein, light-operated smooth crosspoint 2024 is connected between the input port of the output port of each threshold value decision device and OCDM flag code converter 2023, the payload that recovers that the receive threshold decision device sends, determine the down hop route according to the destination address information that comprises in this payload that recovers, the route that utilization sets in advance and the corresponding relation of output port are transmitted to OCDM flag code converter 2023 with this payload by output port corresponding to this down hop route.
The threshold value decision device is when sending this payload that recovers to described OCDM flag code converter, also be used for sending the coding notice to OCDM flag code converter 2023, make it that down hop OCDM flag code corresponding with destination address is provided, finish synchronously the encoding operation to the payload that recovers.
Preferably, OCDM flag code converter 2023 has the input port identical with threshold value decision device number, receive above-mentioned coding notice, and definite input port that receives the payload that recovers, corresponding relation according to default input port, route and OCDM code word, choose the corresponding OCDM code word of route corresponding to this input port, utilize this OCDM code word of choosing that the payload that recovers is re-started the OCDM coding, form the payload with new OCDM flag code.
Because light signal transmits in the core switching network and may cause decay, therefore, preferably, the concrete structure of OCDM flag code converter 2023 can be as shown in Figure 3, among this embodiment, OCDM flag code converter is passive converter, can comprise: core wideband light source 301, the first core data modulator 302, core OCDM encoder 303 and the second core data modulator 304.
Wherein, core wideband light source 301 is for generation of light signal, and wherein, this light signal can be multiple wavelength optical signal.
The first core data modulator 302 is used for the payload that the threshold value decision device recovers in the light territory is modulated to the light signal that core wideband light source 301 produces.
The second core data modulator 304 is used for the payload with new OCDM flag code that core OCDM encoder 303 forms is modulated into the light grouping, and this light grouping is sent.
Usually, for guaranteeing the transmission quality of light signal, as shown in Figure 3, this OCDM flag code converter also can comprise: core light amplifier 305.
Wherein, core light amplifier 305 is connected with the second core data modulator 304, is used for the light grouping that the second core data modulator 304 sends is amplified, and afterwards, the light grouping after amplifying is sent to the core switching network.
Can be found out by above description, the full switch method of light grouping provided by the invention, system, source edge router and core router, compared with prior art, because the source edge router is converted to payload with the data of IP layer, this payload is carried on the light signal, afterwards, this light signal that has carried the payload after the conversion is carried out Optical Code Division Multiplexing OCDM coding, namely, make payload directly carry the OCDM flag code, this can guarantee that payload and OCDM flag code reach synchronous in time, unlike making payload and OCDM flag code in time domain separately in the prior art, and then do not need in the prior art separately to adopt in time domain owing to payload and OCDM flag code the operation of buffer buffer memory payload or signal, thereby do not have in the prior art problems such as the extra loss using optical buffer and bring and noise, Effective Raise the throughput of network.
Further, core router in the core switching network is decoded to the OCDM flag code in the light territory, if successfully decoded, then in the light territory, recover payload, afterwards, read the destination address information that comprises in the payload, determine the down hop route according to this destination address information, utilize this down hop route that this payload that recovers is re-started the OCDM coding, make this payload carry again new OCDM flag code, afterwards this payload is modulated into the light grouping, this light grouping is sent, still be core router if receive the down hop of this light grouping, then this core router is still pressed the aforesaid operations execution, until arrive the purpose edge router, as seen, the performed all operations of core router all carries out in the light territory, has realized the full switch method of light grouping, greatly reduces the time of optical signal transmission.
The above only is preferred embodiment of the present invention, and is in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of making, is equal to replacement, improvement etc., all should be included within the scope of protection of the invention.
Claims (13)
1. the full switch method of light grouping is characterized in that the method comprises:
A, the source edge router is converted to payload with the data of IP layer, produces light signal, payload after the conversion is modulated on this light signal, the light signal that has carried payload is carried out Optical Code Division Multiplexing OCDM coding, and form the light grouping with the OCDM flag code, send this light grouping;
B, the core router that receives the light grouping is decoded to the OCDM flag code of this light grouping, if successfully decoded, then in the light territory, recover the payload in this light grouping, and utilize the down hop route that self obtains that this payload that recovers is re-started the OCDM coding, and form another with the light grouping of OCDM flag code, send this light grouping;
C, if receive the grouping of this light still be core router, then this core router is proceeded by the performed operation of core router among the step B, until the purpose edge router receives till the described light grouping.
2. method according to claim 1 is characterized in that, the payload after the described conversion comprises destination address information; Describedly the light signal that has carried payload carried out OCDM coding comprise:
Determine the down hop route according to the destination address information that comprises in the described payload; Choose the corresponding OCDM code word of down hop route that this is determined; Utilize this OCDM code word of choosing that the described light signal of having modulated payload is carried out the OCDM coding.
3. method according to claim 2 is characterized in that, the core router that receives light grouping among the described step B is decoded to the OCDM flag code of this light grouping and comprised:
Whether the OCDM flag code of judging this light grouping mates with the relevant parameter that pre-sets, and wherein, the described relevant parameter that pre-sets is corresponding with the OCDM code word of carrying out choosing when OCDM encodes; If so, then determine this core router successfully decoded.
4. method according to claim 3 is characterized in that, utilizes the down hop route that self obtains that this payload that recovers is re-started the OCDM coding among the described step B and comprises:
Determine the down hop route according to the destination address information that comprises in the payload that recovers;
Choose the corresponding OCDM code word of definite down hop route, utilize this OCDM code word of choosing that the payload that recovers is re-started the OCDM coding.
5. method according to claim 1 is characterized in that, in the described steps A light signal that has carried payload is carried out the OCDM coding, and the light grouping that forms with the OCDM flag code comprises:
The light signal that has carried payload is carried out the OCDM coding, obtain the payload with the OCDM flag code;
Described payload with the OCDM flag code is modulated into the light grouping, forms the light grouping with the OCDM flag code;
Among the described step B this payload that recovers is re-started OCDM coding, and forms another light grouping with the OCDM flag code and comprise:
The payload that recovers is re-started the OCDM coding, obtain the payload with another OCDM flag code;
The payload with another OCDM flag code that obtains is modulated into the light grouping, obtains another with the light grouping of OCDM flag code.
6. method according to claim 4 is characterized in that, before choosing the corresponding OCDM code word of definite down hop route, further comprises:
Produce light signal, the payload that recovers is modulated on this light signal;
The OCDM code word that described utilization is chosen re-starts the OCDM coding to the payload that recovers and comprises:
The OCDM code word that utilization is chosen re-starts the OCDM coding to the described light signal of having modulated payload.
7. the full optical switching system of a light grouping is characterized in that this system comprises: source edge router, more than one core router and purpose edge router; Wherein,
Described source edge router is used for the data of IP layer are converted to payload, produce light signal, the payload after the conversion is modulated on this light signal, this light signal that has carried payload is carried out the OCDM coding, and formation sends this light grouping with the light grouping of OCDM flag code;
When described core router receives described light grouping, OCDM flag code to this light grouping is decoded, if successfully decoded, then in the light territory, recover the payload in this light grouping, and utilize the down hop route that self obtains that this payload that recovers is re-started the OCDM coding, form another with the light grouping of OCDM flag code, send this light grouping;
Described purpose edge router is used for after receiving the light grouping, recovers the light grouping of reception, and sends this light that recovers and divide into groups to destination address.
8. a provenance edge router is characterized in that, described source edge router comprises: edge wideband light source, the first edge data modulator, edge OCDM encoder and transmitting element, wherein;
Described edge wideband light source is for generation of light signal;
The first edge data modulator is used for the data of IP layer are converted to payload, the payload after this conversion is modulated on the light signal of described edge wideband light source generation;
Described edge OCDM encoder is used for this light signal that has carried payload is carried out the OCDM coding;
Described transmitting element is used for after described edge OCDM encoder is finished the OCDM coding, forms the light grouping with the OCDM flag code, sends this light grouping.
9. source according to claim 8 edge router is characterized in that the payload after the described conversion comprises destination address information;
The destination address information that the payload of described edge OCDM encoder after according to described conversion comprises is determined the down hop route, choose OCDM code word corresponding to definite down hop route, utilize this OCDM code word of choosing that the light signal of having modulated payload is carried out the OCDM coding.
10. source according to claim 9 edge router is characterized in that described transmitting element comprises: the second edge data modulator and edge-light amplifier; Wherein,
Described the second edge data modulator is used for and will be modulated into the light grouping through the described edge formed payload with the OCDM flag code of OCDM encoder;
Described edge-light amplifier is connected to the output port of described the second edge data modulator, is used for described light grouping is amplified, and the light that sends after this amplifications divides into groups.
11. a core router is characterized in that, this core router comprises: more than one full optical correlator, with threshold value decision device and the OCDM flag code converter of the corresponding connection of described full optical correlator, wherein;
Described full optical correlator is used for receiving the light grouping with the OCDM flag code, and the OCDM flag code in the light grouping that receives is decoded, and the id signal after the output decoding is given coupled threshold value decision device;
Described threshold value decision device is used for receiving the id signal of coupled full optical correlator output, judge whether this id signal satisfies default judgment condition, if, then determine coupled full optical correlator successfully decoded, in the light territory, recover the payload in this light grouping, send this payload that recovers to described OCDM flag code converter;
Described OCDM flag code converter is used for receiving this payload that recovers, and utilizes the down hop route that self obtains that this payload that recovers is re-started the OCDM coding, forms another with the light grouping of OCDM flag code, sends this light grouping.
12. core router according to claim 11 is characterized in that, this core router also comprises: light-operated smooth crosspoint;
Described light-operated smooth crosspoint is connected between the input port of the output port of threshold value decision device and OCDM flag code converter, the payload that recovers that the receive threshold decision device sends, determine the down hop route according to the destination address information that this payload that recovers comprises, the route that utilization sets in advance and the corresponding relation of output port are transmitted to OCDM flag code converter with this payload by output port corresponding to this down hop route;
Described threshold value decision device also is used for sending the coding notice to described OCDM flag code converter when sending this payload that recovers to described OCDM flag code converter;
Described OCDM flag code converter has the input port identical with threshold value decision device number, receive described coding notice, and definite input port that receives the payload that recovers, corresponding relation according to default input port, route and OCDM code word, choose the corresponding OCDM code word of route corresponding to this input port, utilize this OCDM code word of choosing that the payload that recovers is re-started the OCDM coding, form another with the payload of OCDM flag code.
13. core router according to claim 12 is characterized in that, described OCDM flag code converter comprises:
The core wideband light source is for generation of light signal;
The first core data modulator, the payload that recovers that is used for receiving is modulated to the light signal that described core wideband light source produces;
Core OCDM encoder, be used for after receiving described coding notice, the input port of the payload that recovers according to reception, choose the corresponding OCDM code word of definite down hop route, utilize this OCDM code word of choosing that the described light signal of having modulated payload is re-started the OCDM coding, form another with the payload of OCDM flag code;
The second core data modulator is used for described another payload with the OCDM flag code is modulated into the light grouping, sends this light grouping.
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