CN1404236A - Light-controlled light exchange structure adopting multiband mark - Google Patents

Light-controlled light exchange structure adopting multiband mark Download PDF

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Publication number
CN1404236A
CN1404236A CN02137619A CN02137619A CN1404236A CN 1404236 A CN1404236 A CN 1404236A CN 02137619 A CN02137619 A CN 02137619A CN 02137619 A CN02137619 A CN 02137619A CN 1404236 A CN1404236 A CN 1404236A
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light
optical
switch
wavelength
mark
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CN1190915C (en
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肖石林
曾庆济
王建新
蒋铭
赵焕东
肖鹏程
黄�俊
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SHANGHAI QUANGUANG NETWORK SCI
Shanghai Jiaotong University
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SHANGHAI QUANGUANG NETWORK SCI
Shanghai Jiaotong University
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Abstract

The present invention relates to a light exchanging structure which is operated by the light and applies multiwavelength mark. The light exchanging matrix is composed of the array of light-operated light switch, the light grouping head is to be marked by the light impulse of several different wavelengthes and each combination of light impulses in different wavelenghes represents a different route information. The light impulse of different bit in light grouping head will control the light switch with different row and column in the light switch array separately according to the differences of timing sequence and optional wavelength so as to realize light route selection. The light grouping head to directly control the light operated light switch can avoid the light-electric conversion in conventional light exchanging to let the control course of the whole exchanging be realized in light

Description

Adopt the light-controlled light exchange structure of multi-wavelength mark
Technical field:
The present invention relates to a kind of light-controlled light exchange structure that adopts multi-wavelength mark, solve the processing of routing iinformation in the light exchange and the problems such as control of light load route, belong to the optical communication technique field.
Background technology:
Optical fiber communication becomes modern communications just gradually and transmits the particularly main mode of primary transmission, and the main direction of its development is further to enlarge message capacity.Recently intensive branch that grows up multiplexing (DWDM) and erbium-doped fiber amplifier (EDFA) technology, promptly so-called " DWDM+EDFA " technology, very effective to the communication dilatation, point-to-point message capacity has been very huge, reaches the Tb/s magnitude.But indispensable electronic type switching equipment is still electronic type in the communication network, and the information processing rate of electronic switching is near limit and be difficult to improve again.This situation has seriously limited the further performance of communication advantage.For this reason, press for development light switching technology.Light exchanges not light requirement-electricity and electricity-phototransformation, does not have " electronic bottleneck " of electronic exchanger, can further expand the capacity of communication network, brings into play the advantage of optical communication more fully.
Early the light switch mode of research is a circuit switched, and in this exchange, basic switching building is a call, and the bandwidth of whole call is retained in the two process.The major defect of this exchanged form is: must at first set up the wavelength routing channel before data transmit, and channel wavelength is occupied always, is released until finishing.Recently light bursty data exchange (OBS) technology that becomes the research focus is two groups of packets that signal are divided into the control grouping that comprises routing iinformation and bearer service, control information in the control grouping will be by the electron process of router, and the not forwarding of the conversion of light requirement electricity/electric light and electronic router of packet is directly being transmitted in the transparent transmission channel end to end.The exchange granularity of OBS is better than circuit switched, and bandwidth only needs unidirectional reservation, relatively is suitable for using in the Local Area Network of the following high burst service of carrying.Yes the grouping light exchange of even more ideal light exchanged form.Article (the IEEE Commun.Mag. that is entitled as " Approaches to Optical Internet Packet Switching " that David K.Hunter in 2000 and IvanAndonovic deliver, Sep.2000, pp.116-122) in this technology is described: grouping light switching technology is divided into the fixing light load group of length with optical information, adds that then the light of carrying routing iinformation believes that head (packets headers) constitutes the optical information bag that has set form one by one and transmits.Grouping light switching technology has few expense, high bandwidth availability ratio, to transmitting the advantages such as the transparency of information format, be the direction of light switching technology development.
People have proposed the technology of several light exchanges that may realize dividing into groups, wherein people such as Winston I.Way has delivered article " A Novel Optical Label Swapping TechniqueUsing Erasable Optical Single-Sideband Subcarrier Label " (OFC 2000 in OFC 2000 meetings, paper WD6,2000), propose in the literary composition to adopt the grouping light switching solution of subcarrier multiplexing (SCM) label switching to have received increasing attention.In this method, packets headers and payload information are multiplexed on the same wavelength, and data-modulated is in base band, and the packets headers information-bearing is on a suitable subcarrier.Adopt the SCM technology, packets headers can be easy to be extracted and refresh.But require subcarrier band very narrow usually, and the interval broad, thereby the limited amount of subcarrier.If payload data rate rises in addition, the band spread problem of base band can override the subcarrier frequency range.The somebody has proposed a kind of method that allows payload data and packets headers information use the transmission of different wavelength channel respectively, and head only refreshes and can realize the channel execution opto-electronic conversion of transmitting header like this.Shortcoming is that payload data takies different wavelength with the packets headers informational needs.
People such as Shilin Xiao have proposed a kind of grouping light switching solution of new multi-wavelength mark switching technology and (have declared patent: 01132092.3)----Shilin Xiao in APOC 2001 meetings, Qingji Zenget al, " Multi-wavelength label optical switching technology ", SPIE APOC 2001 (Asia-Pacific Optical and Wireless Communications Conference), 4582-23,133-138 (2001).In this method, optical packet head is that the light pulse by a plurality of different wave lengths comes mark.On the frequency domain, optical packet head and light load are operated in same wavelength channel, but its wavelength composition (wave spectrum formation) be phase region other.The light load of carrying effective communication information works in the carrier wave of a certain specified wavelength, and the optical packet head that carries routing iinformation then is that the light pulse by several different wave lengths of same communication channel constitutes.These various combinations with light pulse of different wave length are used to refer to different routing iinformations.Light grouping (light bag) with this multi-wavelength mark letter head is when being transferred to the switching node place, understand the wave spectrum pattern (wavelength formation) of letter head by processor, can obtain information such as the carrier wavelength of light load and light wave route, thus the light wave path of the optical switching matrix selective light load of control switching node.The routing iinformation amount that optical packet head carries in this switching technology is big, and processing and antijamming capability are strong than being easier to.
In the above-mentioned various smooth switch mode, optical cross-matrix as its core component is made of the optical switch that needs electric control, the switching of this class optical switch light path is the time of switch to grow (being generally Millisecond), and the route control information must be passed through light-to-current inversion, route control required time is also longer, so be difficult to realize light exchange fast.Recently, develop can be by the optical switch of light wave control switch state in unit such as Harbin Institute of Technology.The switching speed of this class optical switch is very fast, and owing to can control with light signal, can be used for realizing need not the light-operated light exchange of the high speed of light-to-current inversion.
Summary of the invention:
The objective of the invention is at the deficiencies in the prior art, in conjunction with the basic thought of multi-wavelength mark exchange and novel optically controlled optical switch technology, design provides a kind of light-controlled light exchange structure of new employing multi-wavelength mark, whole exchange control procedure is realized in the light territory fully, improve exchange velocity, improve the efficient of entire switching network network.
For realizing such purpose, in the technical scheme of the present invention, adopt the optically controlled optical switch array to form optical switching matrix, go to control the logic control that corresponding optically controlled optical switch (group) is realized array of photoswitch by the different wave length pulse of corresponding bit position in the optical packet head of multi-wavelength mark, finish the Route Selection of light load.
The optical packet head that carries routing iinformation is made of the light pulse of several different wave lengths, and the light pulse of each bit has several choosing wavelengths, and these various combinations with light pulse of different wave length are used to refer to different routing iinformations.The light pulse of different bits in the optical packet head, different according to its sequential and choosing wavelength are implemented control to the optical switch of different row and columns in the array of photoswitch respectively and are realized that optical routing selects.Optical switching matrix is made up of the optically controlled optical switch array, and the on off state of this optical switch is decided by the exterior light control signal.The control signal of switch matrix is directly extracted from signal, and directly removes to control optical switching matrix after label information is separated into single pulse signal by its composition mode is reverse.Concrete logic control process is as follows:
If optical packet head (routing label) is made up of M light pulse (being that number of bits is M), the choosing wavelength number of each light pulse or bit is N.Switching matrix is then selected N * M reconfigurable optical switch arrays of being made up of N * M 2 * 2 optically controlled optical switches for use, when columns can be extended to the requirement of satisfying the matrix columns with a certain or a few bits during greater than M by splitter.Each bit in the optical packet head separates back (can adopt the sequential isolation technics), make each bit control a wherein row switch successively in order, promptly the signal of first bit is used for controlling the first row switch, the signal of second bit is used for controlling the secondary series switch, the signal of the 3rd bit is used for controlling tertial switch,, and the like.On the other hand, control the optical switch of different rows when making each bit adopt different wave length from different path output (can adopt wavelength division multiplexing/demultiplexing technology), if promptly the light pulse wavelength of a certain bit is λ 1, then being used for controlling this bit is the row of first in column switch, if the composition signal is λ 2, then be used for controlling the second row switch, if λ 3, then be used for controlling the third line switch ..., and the like.Each bit optical switch of certain certain row of row in the control switch matrix successively like this, switch series of overall optical packets headers controllable switch matrix, thus finish the selection of light wave route.This technology has realized that the photocontrol of logical routing has also promptly realized light-operated light exchange in the optical switching matrix.
Compare with prior art, the present invention has many-sided superiority.The present invention combines multi-wavelength mark switching technology and optically controlled optical switch technology, the direct control of optical switch matrix is finished the route switching to the light grouped data of switching matrix by multi-wavelength mark, saved the photoelectric conversion process that control signal in the past must be passed through, the control procedure of whole exchange is realized in the light territory fully, thereby exchange velocity and channel utilization have been improved, also improved the efficient of entire switching network network, help breaking through " electronic bottleneck " that exist in the optical communication, development all optical communication technology further enlarges message capacity.
Description of drawings:
Fig. 1 is that the optical information bag of multi-wavelength mark light exchange in the embodiment of the invention constitutes and principle schematic.
Wherein, the optical information bag of Fig. 1 (a) for having set form on the time domain, Fig. 1 (b) is the formation of optical packet head on time domain, Fig. 1 (c) is the wavelength collection of illustrative plates of letter light pulse possibility value in frequency domain.
Fig. 2 is the embodiment of the invention 4 * 4 light-operated optical switching matrix structural representations.
Among Fig. 2, Ai, Bi, Ci, Di (i=1,2,3,4) they are 2 * 2 optically controlled optical switches, and WDM1-WDM5 is a Wave decomposing multiplexer, and 1,2,3,4 is light load input port, and 1 ', 2 ', 3 ', 4 ' is light load output port, 1 StBit----5 ThBit is that optical packet head the 1st is to No. 5 light pulse.
Fig. 3 is λ among the embodiment 2λ 3λ 3λ 4λ FThe logic Route Selection of label information.
Fig. 4 is 2 * 2 optically controlled optical switch structure and schematic diagrams.
2 * 2 optically controlled optical switches shown in Figure 4 are for constituting the essential elements device of switching matrix, and wherein, Fig. 4 (a) is the logical construction of 2 * 2 optically controlled optical switches, and Fig. 4 (b) is the schematic diagram of 2 * 2 optically controlled optical switches.1,2 are the light input among the figure, and 1 ', 2 ' is output light.
Embodiment:
In order to understand technical scheme of the present invention better, execution mode is further described below in conjunction with the example of accompanying drawing and one 4 * 4 light-operated light exchange.
Accompanying drawing 1 is the formation and the principle of multi-wavelength mark light exchange optical information bag in the embodiment of the invention, and by 5 pulse bit (M=5), every bit has 4 kinds of choosing wavelength λ to its optical packet head (signal letter head) 1, λ 2, λ 3And λ 4(N=4), other adds that (promptly this bit does not add control impuls or this wavelength pulse is not controlled optical switch to a kind of non-control state, uses λ FExpression).Accompanying drawing 2 is the initial connection status of 4 * 4 light-operated optical switching matrix structures, and it is by 16 2 * 2 optically controlled optical switch Ai, Bi, Ci, Di (i=1,2,3,4) and 5 formations such as wavelength division multiplexer WDM1-WDM5.The light load of each channel information bag is finished the exchange back by right side 1 ', 2 ', 3 ', the output of 4 ' port by left side 1,2,3,4 port input optical switch matrixes.After the multi-wavelength mark optical packet head that extracts from the optical information bag separates by sequential, the 1st to No. 5 light pulse (1 StBit----5 ThBit) enter the 1st to the 5th wavelength division multiplexer (WDM1-WDM5) respectively.Wavelength division multiplexer is differentiated the wavelength of light pulse, is λ with wavelength 1, λ 2, λ 3Or λ 4Light pulse send into accordingly respectively the 1st to the 4th the row optical switch.In other words, the sequential of mark optical packet head pulse is corresponding with optical switch matrix row and row respectively with wavelength, each row switch in the optically controlled optical switch matrix is controlled by the bit of corresponding sequential in the mark respectively, and the optical switch of the different rows in a certain row is by the light pulse control of the different wave length in the bit of correspondence.First bit pulse is controlled the first row optical switch in this example, second bit control secondary series, and the 3rd bit is controlled the 3rd row, and the rest may be inferred; And be λ as the pulse wavelength in first bit 1Then controlling first switch A1 of first row, is λ as the pulse wavelength 2Then control second switch A2 ...Like this, the combination by packets headers pulse different wave length can realize that promptly different optical routings selects, and the label information of for example some light groupings partly is λ 2λ 3λ 3λ 4λ F, then the A2 in the switch matrix, B3, C3, D4 and E4 are with λ 2λ 3λ 3λ 4λ FThereby the arrival of each bit pulse changes the connection status of switch successively in order makes corresponding light load data select to be input to from port 2 route (heavy line Fig. 3) of port 4 ' output, and the connection status of its switch arrays as shown in Figure 3.Split in the control procedure of closing matrix at overall optical grouping mark, need not mark and packet payload are carried out the conversion of photoelectricity/electric light, control, improved exchange velocity but directly adopt light signal to split the pass.
The essential elements device of the formation switching matrix described in this example is 2 * 2 optically controlled optical switches, and its logical relation is shown in Fig. 4 (a).Light signal is not the pass-through state 1 to 1 ', 2 to 2 ' (state I) shown in the solid line when controlling the light input; Light signal was the crossing condition 1 to 2 ', 2 to 1 ' (state I I) shown in the dotted line when input of control light was arranged.A kind of practical structures of this optical switch is shown in Fig. 4 (b).The intermediate layer that one special material is arranged between two light penetrating objects, its refractive index and light penetrating object is identical under the normality, and incident light can lead directly to (state I); When being subjected to certain special light wave (control light) irradiation, its refractive index diminishes, and incident light 1,2 is owing to total reflection takes place respectively by 2 ', 1 ' output (state I I).Now existing this class optical switch is succeeded in developing.The another kind of essential elements device that constitutes light-operated optical switching matrix is a wavelength division multiplexer, and this class device has been matured product.

Claims (3)

1, a kind of light-controlled light exchange structure that adopts multi-wavelength mark is characterized in that optical switching matrix is made up of the optically controlled optical switch array, and a mark packets light pulse of carrying routing iinformation is directly controlled array of photoswitch and realized the light exchange.
2, as the light-controlled light exchange structure of the said employing multi-wavelength mark of claim 1, the label information that it is characterized in that different bits in the optical packet head adopts the sequential separation method, makes each bit control the optical switch of different lines in the optical switching matrix successively in order.
3, as the light-controlled light exchange structure of the said employing multi-wavelength mark of claim 1, it is characterized in that in the optical packet head adopting the label information of each bit of different choosing wavelengths to adopt the method for wavelength division multiplexing/demultiplexing, make each bit control the optical switch of different rows in the optical switching matrix successively in order.
CNB021376190A 2002-10-24 2002-10-24 Light-controlled light exchange structure adopting multiband mark Expired - Fee Related CN1190915C (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101110761B (en) * 2007-08-23 2010-06-02 上海交通大学 Optical packet switching system with polarized and mixed mark of wavelength
CN101783972B (en) * 2009-01-16 2013-05-01 北京邮电大学 Optical-packet full switch method, system and device
CN105164952A (en) * 2013-05-10 2015-12-16 华为技术有限公司 System and method for photonic switching
CN109176074A (en) * 2018-10-26 2019-01-11 成都科力夫科技有限公司 A kind of engine axial workpiece restraint device
WO2022111223A1 (en) * 2020-11-30 2022-06-02 华为技术有限公司 Communication apparatus, communication system and nonlinear compensation method

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101110761B (en) * 2007-08-23 2010-06-02 上海交通大学 Optical packet switching system with polarized and mixed mark of wavelength
CN101783972B (en) * 2009-01-16 2013-05-01 北京邮电大学 Optical-packet full switch method, system and device
CN105164952A (en) * 2013-05-10 2015-12-16 华为技术有限公司 System and method for photonic switching
CN105164952B (en) * 2013-05-10 2018-12-14 华为技术有限公司 System and method for photon count statistic
CN109176074A (en) * 2018-10-26 2019-01-11 成都科力夫科技有限公司 A kind of engine axial workpiece restraint device
WO2022111223A1 (en) * 2020-11-30 2022-06-02 华为技术有限公司 Communication apparatus, communication system and nonlinear compensation method

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