CN101437178B - Light packet switching structure based on light code division multiplexing - Google Patents
Light packet switching structure based on light code division multiplexing Download PDFInfo
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Abstract
The invention discloses an optical packet switching structure on the basis of optical code division multiplexing, which adopts two stages of optical switches to perform interconnection, wherein the first stage optical switch, namely the optical switch in an input port plane, is connected with optical decoders and optical coders to achieve label update; and the second stage optical switch, namely the optical switch in a port exchange plane, is connected with different input/output ports to achieve port exchanges. According to the corresponding relation between an input label and an output label in certain input port in a label forwarding table, the connection relation between each optical coder and each optical decoder is determined, and the connection relation is achieved through driving the optical switch in the input port plane by a control signal. The connection relation between the output ports of the optical coder is determined according to the input port in the label forwarding table and the output port corresponding to the input label, and the connection relation is achieved through driving the optical switch in the port exchange plane by the control signal. Therefore, the optical packet label update and the port exchange are achieved.
Description
Technical field
The invention belongs to technical field of optical fiber communication, specifically, relate to a kind of light packet switching structure based on Optical Code Division Multiplexing.
Technical background
In optical-fiber network, the electronic bottleneck of restriction optical network band width has appearred in the transport service that adopts the switching node of realizing function of exchange after the opto-electronic conversion more and more can not processing speed to increase rapidly.
Optical packet switching technique adopts the light exchanging form to replace electric exchanging form, overcome the problems of Signal Integrity of high-speed electrical signals in transmission course, avoid the problems such as signal rising and falling edges increase that the response of electronic device causes in storage and processing procedure, can realize the processing light signal of linear speed.Optical packet switching technique adopts the exchange granularity of packet level simultaneously, has high statistic multiplexing rate.In order to reduce the complexity of node in the exchange process, optical-fiber network adopts generalized multiprotocol label switching (GMPLS) protocol (Generalized Multi-protocol Label Switching, GMPLS) set up label switched path for transmission packets, realize route at fringe node, realize exchange at core node, so label has comprised the information of grouping route and exchange.
The Optical Code Division Multiplexing technology is a kind of optical multiplexer technology that adopts different optical to encode to distinguish different user information.Each user is assigned with a light code word, and is mutually orthogonal between the light code word, and the user extracts by the light code word of distributing and sends to own data message.User data adopts destination user's light code word before entering fiber channel, finish the optical encoding of data by optical encoder; Receiving terminal is decoded to the light signal that receives with the light decoder of the light code word correspondence of distributing, and reverts to primary signal with the light signal of light code word coupling after decoded, and the light signal of other and light code word quadrature becomes noise signal after decoded.
For the quick identification that realizes that cursor is signed, the accurate renewal that the transparent exchange of light grouping and cursor are signed adopts the light code word to represent the optical packet format of the Optical Code Division Multiplexing of label.Separating by the light decoder and recover at each output port of switching node will be from the light grouping of this output port output, before output by optical encoder to the light recompile that divides into groups, be the new label of light grouping affix.Light packet switching structure based on Optical Code Division Multiplexing requires and can import the optical encoder of output label correspondence according to the Label Forwarding Information Base configuration; Requirement is connected with the exchange of output port according to Label Forwarding Information Base configuration input label.
Summary of the invention
The object of the present invention is to provide a kind of light packet switching structure of realizing tag update and port exchange according to Label Forwarding Information Base based on Optical Code Division Multiplexing.
For achieving the above object, the light packet switching structure based on Optical Code Division Multiplexing of the present invention is characterized in that, comprising:
A plurality of input ports plane, the input port plane is by optical branching device, a plurality of smooth decoders, optical switch and a plurality of optical encoder are formed, the optical branching device that connects an input port plane based on each input port of the light packet switching structure of Optical Code Division Multiplexing respectively, the output of optical branching device connects the input of each light decoder on this input port plane respectively, the output of each light decoder connects the input of the optical switch on this input port plane respectively, optical switch can switch according to the control signal that the foundation Label Forwarding Information Base produces, the output of optical switch connects the input of each optical encoder on this input port plane, and the output of each optical encoder constitutes the output on this input port plane; The light grouping of each input port input of light packet switching structure is input to the optical branching device on input port plane separately, optical branching device is broadcast to the light grouping in each light decoder on this input port plane, recover former payload signal with the output of the light decoder of importing light block encoding coupling, and switch through the optical switch on this input port plane that the control signal that the foundation Label Forwarding Information Base produces is switched, the payload signal that recovers is input to the new cursor of certain optical encoder affix on this input port plane signs, obtain the light grouping behind the tag update;
A plurality of port exchange planes, each port exchange plane is a port exchange optical switch, port exchange optical switch can switch according to the control signal that the foundation Label Forwarding Information Base produces, a plurality of input ports of a port exchange optical switch connect the output of an optical encoder in a plurality of input ports plane respectively, are used for the light behind the tag update of input port plane output is packet-switching to a certain output port plane;
A plurality of output ports plane, each output port plane are an optical coupler, and each input port of each optical coupler connects port exchange optical switch respectively, are used for the light grouping coupling back from the different port exchange plane is exported from output port.
The present invention realizes foregoing invention like this, behind the light grouping arrival switching node based on Optical Code Division Multiplexing, be input to a certain input port plane by input port, light is grouped in the input port plane and is broadcast to each light decoder through optical branching device, recover former payload signal with the output of the light decoder of importing light block encoding coupling, and the optical switch in this input port plane of process is input to certain optical encoder with the payload signal that recovers, after optical packet signal has been realized the renewal of optical code label through optical encoder, certain the port exchange plane that is input to; Through the optical switch in the port exchange plane, the light grouping is switched to certain output port plane, optical coupler in the output port plane will be exported from output port from the light grouping coupling back of different port exchange plane, realize that like this light packet label upgrades and the port exchange.
Light packet switching structure based on Optical Code Division Multiplexing of the present invention adopts the two-stage optical switch to interconnect, first order optical switch, and promptly the optical switch in the input port plane connects light decoder and optical encoder realization tag update; Second level optical switch, promptly the optical switch in the port exchange plane connects different input/output end ports, realizes the port exchange.
Light packet switching structure based on Optical Code Division Multiplexing of the present invention can be provided with according to Label Forwarding Information Base.The two-stage optical switch can be in the interconnection switching that realizes under the driving of control signal between the port.According to the corresponding relation of input label and output label in a certain input port in the Label Forwarding Information Base, determine the annexation of each optical encoder and each light decoder, realize this annexation by the optical switch that control signal drives in the input port plane.Determine the annexation between the port of optical encoder output according to the output port of input port in the Label Forwarding Information Base and input label correspondence, realize this annexation by the optical switch that control signal comes the drive end oral sex to change the plane.
Description of drawings
Fig. 1 is a kind of embodiment structure chart of light packet switching that the present invention is based on Optical Code Division Multiplexing;
The light grouping that Fig. 2 is based on Optical Code Division Multiplexing produces schematic diagram;
Fig. 3 produces light packet configuration figure;
Fig. 4 is that cursor is signed more new diagram;
Fig. 5 is a packet switching construction instance graph.
Embodiment
For the ease of problem description,, the preferred embodiments of the present invention is described below in conjunction with accompanying drawing.But it should be noted that to avoiding and adopted known technology and function to water down theme of the present invention, in corresponding description, will be simplified by meeting or ignore in system.
Fig. 1 is a kind of embodiment structure chart of light packet switching that the present invention is based on Optical Code Division Multiplexing.In the present embodiment, the present invention is based in the light packet switching structure of Optical Code Division Multiplexing, the input port level is formed on N input port plane, and M port exchange plane formed the port switching stage, and the output port level is formed on N output port plane.
In the present embodiment, connect input port plane a 1～N respectively successively, specifically, be connected to 1 * M optical branching device input separately of input port plane 1～N based on each input port 1～N of the light packet switching structure of Optical Code Division Multiplexing.
Each input port plane is all by one 1 * M (M is the number of light code word) optical branching device, M light decoder, and one M * M optical switch and M optical encoder are formed.The output of 1 * M optical branching device connects the light decoder 1,2 of the code word of not sharing the same light respectively ... the input of M, light decoder 1,2,, the output of M connects the input of M * M optical switch respectively, and the output of M * M optical switch connects the optical encoder 1 of the code word of not sharing the same light, 2 ..., the input of M, optical encoder 1,2 ..., the output of M constitutes the output on input port plane.Control signal 11～the 1N that produces according to the foundation Label Forwarding Information Base configures the port connection status of M * M optical switch, the light decoder 1,2 of the code word that realizes not sharing the same light ..., the optical encoder 1,2 of the M and the code word of not sharing the same light ..., the connection of M.
When having certain label, after the light grouping of promptly having carried out certain light codeword coding enters into the input port plane from an input port, through optical branching device, optical packet signal is assigned to each light decoder, to recover former smooth payload signal with the light decoder of light grouping light codeword coding coupling, promptly realized wiping of old cursor label, unmatched smooth decoder then is converted into noise signal with the optical packet signal of input; The light payload signal that recovers is imported into certain optical encoder through M * M optical switch, carries out the coding of certain light code word through this optical encoder, and the cursor label that have been the affix of light payload have also just been realized the update functions that cursor is signed.
Each port exchange plane is made of a N * N optical switch.The output connectivity port exchange plane 1,2 of input port plane 1～N ... the input of M, i.e. the input port plane optical encoder 1,2,, the output of M connects a N * N optical switch respectively, and the output on such input port plane has connected M N * N optical switch respectively.In the present embodiment, the output of each input port plane 1～N same-code device is connected to same port exchange plane, promptly on N * N optical switch.The output of N * N optical switch constitutes the output of port exchange plane.
The port connection status of the control signal 21～2M configuration N * N optical switch that produces according to the foundation Label Forwarding Information Base realizes light is packet-switching to correct output port.Cocommutative at each N * N optical switch all is the optical packet signal of same light codeword coding.
Each output port plane is made of a M * 1 optical coupler.The output of port exchange plane connects the input on output port plane, and promptly the output of N * N optical switch connects the input of M * 1 optical coupler.In the present embodiment, the output port of identical numbering is connected to same output port plane in each port exchange plane, promptly on M * 1 optical coupler.The output of M * 1 optical coupler is as the output port 1～N on output port plane, also be switching fabric output, realization will be from the optical packet signal coupling back output of different port exchange plane.
In the present embodiment, based on the light packet switching structure of Optical Code Division Multiplexing according to Label Forwarding Information Base under the driving of control signal, finish the setting of N in M in each input port plane * M optical switch and the port exchange plane * N optical switch.M in the input port plane * M optical switch has realized being used for the light decoder of optical code label identification and being connected of the optical encoder that is used for new tag update.The switching of the connection by M * M optical switch port can realize the interconnection of different light decoders and optical encoder, promptly realizes the combination that different input labels and output label are right.
N in the port exchange plane * N optical switch is used to realize the interconnection of input port 1～N and output port 1～N, by the connection of N * N optical switch port is set, the light grouping can be connected to each output.Label Forwarding Information Base is according to the label switched path of setting up, and is stored in the routing table that switching node is used to realize packet forward.The label forwarding tableau format is an input port, input label, and output port and output label show the grouping of certain input label on certain input port, label should be updated to certain output label, and exchanges to certain output port.N in M in the input port plane * M optical switch and the port exchange plane * N optical switch is finished setting according to Label Forwarding Information Base, and when Label Forwarding Information Base changed, corresponding optical switch also must reconfigure according to current Label Forwarding Information Base.
Behind the light grouping arrival switching node based on Optical Code Division Multiplexing, be input to a certain input port plane of input port level by input port.Light is grouped in the input port plane and is broadcast to each light decoder through optical branching device, recover former payload signal with the output of the light decoder of importing light block encoding coupling, and the M * M optical switch in the process input port plane is input to certain optical encoder with the payload signal that recovers, after optical packet signal has been realized the renewal of optical code label through optical encoder, be input to certain the port exchange plane in the port switching stage, through the N * N optical switch in the port exchange plane, the light grouping is switched to certain output port plane of output port level, and the M in the output port plane * 1 optical coupler will be exported from output port from the light grouping coupling back of different port exchange plane.
In the present embodiment, the light packet switching structure implementation procedure based on Optical Code Division Multiplexing of the present invention is as follows:
(1) determine the input/output end port number N of switching fabric, the number M of the optical encoder in each input port plane/light decoder, the one group of orthogonal optical sign indicating number that is adopted, and make optical encoder and light decoder according to the light code system that adopts.Optical exchange structure of the present invention has generality to the light sign indicating number that adopts, and does not limit the specific implementation of optical encoder and light decoder.
(2) realization on input port plane.The input port plane is by 1 * M optical branching device, M light decoder, and a M * M optical switch, M optical encoder formed.The output of 1 * M optical branching device connects M light decoder respectively; The output of M light decoder connects the input of M * M optical switch respectively; M * the output of M optical switch connects the input of M optical encoder respectively; The input of 1 * M optical branching device is as the input on input port plane, and the output of M optical encoder is as the output on input port plane.M * M optical switch must be selected and can carry out the optical switch that clog-free port switches by external control signal; Parameter swap time of optical switch has determined the time of system configuration switching fabric; The insertion loss is little, and polarization correlated low light opens the light and helps the lifting of systematic function.Each input port of switching fabric connects an input port plane respectively, connects input port plane 1 as input port 1, and input port 2 connects input port plane 2 ..., need N input port plane altogether.
(3) realization of port exchange plane.The port exchange plane is made of N * N optical switch, and the input of N * N optical switch is the input of port exchange plane, and the output of N * N optical switch is the output of port exchange plane.N * N optical switch must carry out clog-free port by external control signal and switch; Optical switch is little swap time, and the insertion loss is little, polarization correlated low.The port switching stage needs M port exchange plane, as the port exchange plane 1 that each optical encoder 1 connects, and the port exchange plane 2 that each optical encoder 2 connects ..., i.e. M N * N optical switch.
(4) realization on output port plane.The output port plane is made of M * 1 optical coupler, and the input of M * 1 optical coupler is as the input on output port plane, and the output of M * 1 optical coupler is as the output on output port plane.Each output port of switching fabric needs an output port plane, connects output port plane 1 as output port 1, and output port 2 connects output port plane 2 ..., need N output port plane altogether.
(5) interconnection at different levels.M the output port of input port plane i connects i input port of each port exchange plane; M the input port of output port plane i connects i output port of each port exchange plane.
(6) in the realization of switching fabric because optical branching device, optical coupler, optical encoder, the optical power loss that light decoder and optical switch bring should add image intensifer in corresponding position and compensate; For the device of light polarization sensitivity, as optical encoder, the light decoder, optical switch should add the adjusting that Polarization Controller is imported polarization state at input.
The light grouping that Fig. 2 is based on Optical Code Division Multiplexing produces schematic diagram.Light grouping based on Optical Code Division Multiplexing adopts the light code word to represent label signal, therefore label signal and light code word has been carried out mapping one by one.Light code word C as shown in Figure 2
1Expression label signal L
1, code word C
2Expression label signal L
2...For having label L
1Light grouping, promptly be to have carried out light code word C
1The optical packet signal of coding.The light payload signal is input to certain optical encoder just can produces the signal that has passed through certain light codeword coding, promptly with the optical packet signal of certain corresponding label.It is to be noted that the requirement of light payload signal must satisfy the requirement of optical encoder.As the optical encoder based on fibre delay line, the pulse duration of input light payload must equal the chip time of optical encoder, and the duration of a bit (blanking times of two continuous impulses) must equal the code length time of optical encoder.
Fig. 3 produces light packet configuration figure.Sign the light grouping of transmitting on the switching path in order to be created in different cursors, requirement can be exported at a light grouping generation node and be had the light grouping that different cursors are signed, and can produce yard optical packet signal of coding of not sharing the same light.Be illustrated in figure 3 as and adopt 1 * M optical switch, the structure of the generation light grouping that the optical encoder of M light code word correspondence and M * 1 optical coupler constitutes.The input of 1 * M optical switch connects the light payload signal; The M of a 1 * M optical switch output connects the input of M optical encoder respectively; The output of M light decoder connects the input of M * 1 optical coupler respectively; The output of M * 1 optical coupler is the output of the optical packet signal of generation.By controlling the connection status of 1 * M optical switch, the light payload signal is input to the coding of finishing this light code word in the optical encoder of requirement, export from optical coupler afterwards.
Fig. 4 is that cursor is signed more new diagram.Have the L that cursor is signed
1, i.e. light code word C
1Optical packet signal through C
1The light decoder after, input signal is reduced to the light payload signal, that has realized that old cursor signs wipes, and passes through C again
1Optical encoder, the light payload signal is encoded, promptly produced and have cursor and sign L2, i.e. light code word C
2Optical packet signal.For an input port plane that 4 optical encoders/light decoder is arranged, in order to realize the configuration of I/O Label Forwarding Information Base as shown in FIG., only need input port and the output port that 4 * 4 light open the light to be configured to 1 → 2,2 → 3 by control signal, 3 → 4,4 → 1.
Fig. 5 is a packet switching construction instance graph.In this example, for having label L from input port 1
2Light grouping require to be updated to label L
M, and export from output port N.The corresponding configuration of switching fabric is: the input port 2 of M in input port plane 1 * M optical switch connects output port M, and the input port 1 that N among the port exchange plane M * N light opens the light connects output port N.Have label L
2The light decoder 2 that is grouped in the input port plane 1 of light be reduced into the light payload signal, and be imported among the optical encoder M through M * M optical switch, carry out light code word C
MCoding, promptly upgrading label is L
MLight grouping, passing through N among the port exchange plane M * N light again, to open the light label be L
MLight grouping output to output port N, and through the optical coupler output on output port plane.
Although above the illustrative embodiment of the present invention is described; so that those skilled in the art understand the present invention; but should be understood that; the invention is not restricted to the scope of embodiment; to those skilled in the art; as long as various variations appended claim limit and the spirit and scope of the present invention determined in, these variations are conspicuous, all utilize innovation and creation that the present invention conceives all at the row of protection.
Claims (1)
1. the light packet switching structure based on Optical Code Division Multiplexing is characterized in that, comprising:
A plurality of input ports plane, the input port plane is by optical branching device, a plurality of smooth decoders, optical switch and a plurality of optical encoder are formed, the optical branching device that connects an input port plane based on each input port of the light packet switching structure of Optical Code Division Multiplexing respectively, the output of optical branching device connects the input of each light decoder on this input port plane respectively, the output of each light decoder connects the input of the optical switch on this input port plane respectively, optical switch can switch according to the control signal that the foundation Label Forwarding Information Base produces, the output of optical switch connects the input of each optical encoder on this input port plane, and the output of each optical encoder constitutes the output on this input port plane; The light grouping of each input port input of light packet switching structure is input to the optical branching device on input port plane separately, optical branching device is broadcast to the light grouping in each light decoder on this input port plane, recover former payload signal with the output of the light decoder of importing light block encoding coupling, and switch through the optical switch on this input port plane that the control signal that the foundation Label Forwarding Information Base produces is switched, the payload signal that recovers is input to the new cursor of certain optical encoder affix on this input port plane signs, obtain the light grouping behind the tag update;
A plurality of port exchange planes, each port exchange plane is a port exchange optical switch, port exchange optical switch can switch according to the control signal that the foundation Label Forwarding Information Base produces, a plurality of input ports of a port exchange optical switch connect the output of an optical encoder in a plurality of input ports plane respectively, are used for the light behind the tag update of input port plane output is packet-switching to a certain output port plane;
A plurality of output ports plane, each output port plane are an optical coupler, and each input port of each optical coupler connects port exchange optical switch respectively, are used for the light grouping coupling back from the different port exchange plane is exported from output port.
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| CN102217208B (en) * | 2010-12-31 | 2016-07-06 | 华为技术有限公司 | The transmission method of signal, combiner and system |
| CN104619050B (en) * | 2010-12-31 | 2016-10-05 | 华为技术有限公司 | The transmission method of signal, combiner and system |
| CN102291634A (en) * | 2011-09-08 | 2011-12-21 | 电子科技大学 | Optical packet switching device |
| US9654853B2 (en) * | 2013-05-10 | 2017-05-16 | Huawei Technologies Co., Ltd. | System and method for photonic switching |
| US9560427B2 (en) | 2014-05-28 | 2017-01-31 | Huawei Technologies Co., Ltd. | Scalable silicon photonic switching architectures for optical networks |
| CN112383357B (en) * | 2020-10-20 | 2021-10-22 | 电子科技大学 | Power balancing device of space division multiplexing optical switching node |
| CN112949334B (en) * | 2021-03-04 | 2022-06-10 | 武汉大学 | Reliable radio frequency identification method based on packet multiplexing |
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| CN1419353A (en) * | 2002-10-24 | 2003-05-21 | 上海交通大学 | Optical code division multiple control channel based optical burst package switching system |
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