CN101171879A - Optical switching device for data packets - Google Patents

Optical switching device for data packets Download PDF

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Publication number
CN101171879A
CN101171879A CNA2005800421391A CN200580042139A CN101171879A CN 101171879 A CN101171879 A CN 101171879A CN A2005800421391 A CNA2005800421391 A CN A2005800421391A CN 200580042139 A CN200580042139 A CN 200580042139A CN 101171879 A CN101171879 A CN 101171879A
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wmr
wavelength
packet
switch
wmt
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Chinese (zh)
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W·普罗布斯特
H·鲁尔
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Nokia Solutions and Networks GmbH and Co KG
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Nokia Siemens Networks GmbH and Co KG
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0005—Switch and router aspects
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0005—Switch and router aspects
    • H04Q2011/0007—Construction
    • H04Q2011/0016—Construction using wavelength multiplexing or demultiplexing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0005—Switch and router aspects
    • H04Q2011/0007—Construction
    • H04Q2011/002—Construction using optical delay lines or optical buffers or optical recirculation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0005—Switch and router aspects
    • H04Q2011/0007—Construction
    • H04Q2011/0024—Construction using space switching
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0005—Switch and router aspects
    • H04Q2011/0007—Construction
    • H04Q2011/0033—Construction using time division switching
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0005—Switch and router aspects
    • H04Q2011/0037—Operation
    • H04Q2011/0047—Broadcast; Multicast

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Optical Communication System (AREA)
  • Use Of Switch Circuits For Exchanges And Methods Of Control Of Multiplex Exchanges (AREA)

Abstract

Disclosed is a switching device (SW1) which initially splits incoming WDM signals (WMR1 to WMRM) into individual signals (11toNM) wavelength-wise, said individual signals (11 to NM) being fed to switching and delaying elements (SD) via optical connections/input lines (LR11 to LRNM). The switching and delaying elements (SD) connect one respective random input line (LR11 to LRNM) to any output line (LT11 to LTNP). One of said elements through-connects a data packet (DP) having the same wavelength (1 to N) to one output line (LT11 to LTNP), respectively, the delay of the data packets (DP) being infinitely variable. The through-connected data packets are combined into outgoing individual signals, which are combined into outgoing WDM signals (WMT1 to WMTP).

Description

The optical switch device that is used for packet
The present invention relates to a kind of optical switch device of the preamble according to claim 1.
In the light data network, trend is transmits data packets.Data burst is also referred to as packet, and these data bursts can be formed and had different length again by different less packets.The packet of identical wavelength it is believed that transmission by a number, and a plurality of this " channel " (individual signals) are merged into a wavelength multiplex signals, abbreviate the WDM signal as.Problem is in optical switching network now, is merged into new WDM signal by being also referred to as for the optical switch device transmits data packets of " switch " or " router " or with packet under the situation that does not have the big loss of time.
Light (photon) switching device can be realized by different way.A kind of possibility is to use controlled speculum, on these speculums can be connected to arbitrarily output from input arbitrarily with the light that arrives.Yet, a plurality of problems appear when packet (also packet being interpreted as burst at this) exchanges.If transmission capacity (" bandwidth ") lacks, then must carry out switching process soon on the one hand, and on the other hand must be with the packet intermediate storage.
In electricity field, by U.S. Pat 6,195,335 B1 have described a kind of electronic switching device, and this electronic switching device is with matrix form switch structure and that be suitable for packet.It comprises first electronic memory in incoming line, and comprises the other Crocc-Point memory that can receive at least one number according to bag at switching point (Cross Point).At any time can be from two memories call number packet (burst), cause them can be merged into data flow and can be with high " efficient, promptly can be transmitted under the situation for the broadband of domination in optimum utilization at this with other packet/burst.As under the situation of electronic memory, data can be put at any time and be written into and put at any time invoked photon memory and do not exist in the foreseeable time.
If adhere to the solution of pure optics, application delay line for example then is as for example described in European patent application EP 1176846 A2.
Older U.S. Patent application US 2002/0114035 A1 utilizes identical known structure own, so that Wavelength-converting.A realization that problem is the light delay element when connecting packet, these light delay elements for example can be realized with the discontinuous transmission time or by circulating memory (optical fiber loop) by the optical fiber of switchable different length.But the very big time period (transmission capacity-" bandwidth ") still is not utilized in these systems when transmits data packets.
Therefore, task of the present invention is to provide a kind of improved optical switch device for packet network.
This task solves according to the feature of Patent right requirement 1.
Favourable expansion scheme of the present invention provides in the dependent claims.
The simple relatively structure of optical coupling field advantageously, this structure is given up the memory of input side or outlet side.Each switching point only needs unique as the effective intermediate store of delay element except optical switch, and be stepless adjustable and therefore be responsible for optimum efficiency (utilization of bandwidth) when switching the running time of this intermediate store.
A kind of simple especially structure realizes by dividing the switch aspect.For example, all are identical, transfer in a switch aspect (parts) from the signal of the identical wavelength of different wave length multiplexed signals.
For influencing each other of signal minimized, also can only connect different wavelength in the transfer of a switch aspect.Like this, all signals from a wavelength multiplex signals for example can be assigned to a switch aspect.Wavelength multiplexer is with the external signal filtering of other wavelength.In addition, optical switch can use the additional function such as wavelength Conversion to replenish, and these additional functions are realized by the wavelength shifter that some are connected between additional input line and the output line.When realizing optical switch and delay element, can utilize different technology.
The favourable structural scheme of other of switching device can be realized the selection and the independent delay of these signal/packets simultaneously of the signal/packet of definite wavelength.
Set forth the present invention in more detail by basic circuit diagram and realization sketch now.
Fig. 1 illustrates the basic circuit diagram of optical switch device,
Fig. 2 illustrates the WDM signal that is used for transmission data burst,
Fig. 3 illustrates the flexible program of optical switch device,
Fig. 4 illustrates the realization example of additional function,
Fig. 5 illustrate according to the physical unit of EIT principle and
Fig. 6 illustrates the physical unit with photon crystal structure.
Under the situation of the optical switch device SW1 shown in Fig. 1, by a plurality of Transmission Fibers FR 1-FR MReceive wavelength multiplex signals WMR 1-WMR MIn these WDM signals each is all at wavelength demultiplexer DMUX 1-DMUX MIn be broken down into the individual signals of different wave length λ 1-λ i-λ N, these individual signals are assigned to each channel.
Fig. 2 goes out to have N channel K λ 1 with principal diagram 1-K λ N 1Or wavelength X 1 1-λ i 1-λ N 1A WDM signal WM 1At this, subscript is represented corresponding WDM signal.In other explanation, letter r represents to arrive/signal or corresponding circuit/connections of receiving, and tee represent to leave/signal or the circuit/connection accordingly that send.Packet or data burst are transmitted by each channel, for example sequence of data packet DP1 1By the first channel K λ 1 1Be transmitted.
Switching device SW1 according to Fig. 1 comprises the switch matrix with a plurality of switch element SE1-SEN.Has the multiplexed signals WMR that is received 1-WMR MIdentical wavelength X 1 1To λ 1 MThe input that is assigned to switch element SE1-SEN respectively of the individual signals of packet connect (incoming line), each one input connects LR1 in Fig. 1 1To LR1 MThe individual signals λ 1 with wavelength X 1 1-λ 1 MBe fed to the first switch element SE1.Respectively to multiplexed signals WMR to other switch element SE2-SEN 1-WMR MAll other individual signals λ 2 1-λ N MOperate accordingly, these other switch elements are illustrated in background.Input connects LR1 1To LR1 MIn each all on the first switch element SE1, be connected (output line) LT1 with delay element SD with P output by P switch 1To LT1 PConnect.Passable by this matrix structure Nx (MxP), the packet DPR1 of the packet of any wavelength, the wavelength X 1 that received in switch element SE1 lingeringly is transferred to P output by a unique effective switch arbitrarily with delay element SD respectively from each input connection/incoming line is connected/output line LT1 1-LT1 PIn each on, at P output connection/output line LT1 1-LT1 PIn each on form the individual signals that the packet DPT that will send by identical wavelength forms.First connects all of all switch element SE1-SEN respectively by wavelength multiplexer MUX to all P output 1To MUX P(it also is understood that power combiner) merged, and the packet DPT of all different wave lengths that will send is merged into the wavelength multiplex signals WMT that leaves again thus 1To WMT P, the optical fiber FT of these wavelength multiplex signals by leaving 1-FT PBe output.
Usually the quantity P of the wavelength multiplex signals that is sent is corresponding to the quantity of the multiplexed signals that is received: M=P.The switch of switch and delay element SD and running time are regulated according to time point by the control device CON that only delineates in principle, receive and send data burst at these time points, cause to produce the individual signals of leaving away very close to each other as far as possible respectively.
By activating a plurality of switches and delay element SD simultaneously, in this and other embodiment, also can realize broadcast mode (data burst that is received is transferred on a plurality of outputs).
Switch element SE also can be the channel design for different wave length, as the switching device SW2 that illustrates in principle among Fig. 3.For example, in the first switch element SE1 having the first wavelength multiplex signals WMR of wavelength 1 Individual signals λ 1 1Distribute to first input and connect LR1 1, the first wavelength multiplex signals WMR 1Signal λ 2 1Distribute to second input and connect LR2 1Or the like, connect LRN until N individual signals with wavelength X N being distributed to N input 1Then respectively with other wavelength multiplex signals WMR 2-WMR MOne of individual signals flow to other switch element SE2 to SEM.To wavelength multiplexer MUX 1-MUX POutput connect LT1 1-LTN P(so at this) be disposed in the rectangular vertical plane of switch element in, the output under causing and the individual signals of all identical wavelength can being switched to connects (output line) LT1 1-LTN POr wavelength multiplexer MUX 1-MUX PInput on.Show the signal converting that is used for wavelength X 1 and arrive wavelength multiplexer MUX 1-MUX PConnection and be used for other individual signals to wavelength multiplexer MUX PConnection.Possible switch and delay element SD are illustrated as point simplifiedly.
Two Fig. 1 and 3 should be understood that basic circuit diagram.Input and output connect and can realize as fiber waveguide (for example glass fibre or learn a skill with planar light) or as freely spraying optics (Freistrahloptik) according to technology.
Fig. 4 illustrates the optical switch device SW with additional function.In incoming line (input connects) LRj and output line LTj, inserted wavelength shifter WLC.Between other incoming line LRW and output line LTW, also inserted wavelength shifter WLC and/or have fixing, can be step by step or the delay element DG of the time of delay of regulating changeably.Flexibility when wavelength shifter improves the wavelength multiplex signals that will send in switching.One of other delay element DG is illustrated, and these other delay elements can be at the not enough situation turn-on delay time T time of delay of switch and delay element SD.The straight-through of a plurality of switches and delay element SD can be connected VD and realize by direct output-input.
Fig. 5 is illustrated in the physical implementation of switching device SW3 under the situation of using so-called EIT (electromagnetically induced transparency (electromagnetically induced is transparent)) principle, in this principle the control of switch and delay element by having regulation amplitude and the control beam of the frequency interval of the flashlight frequency of regulation carry out.People such as Matthew S.Bigelow are at paper " Observation of Ultraslow LightPropagation in a Ruby Crystal at Room Temperature " (Physical Review Letters; The 90th volume, o. 11th, among the 113903-1-113 903-4 and people such as same C.j.Chang-Hasnan at " VariableOptical Buffer Using Slow Light in Semiconductor Nanostructures " (Proc.of the Ieee, the 91st volume, o. 11th, the principle of this method has been described in November, 2003,1884-1897 page or leaf).
The wavelength multiplex signals WMR that each received 1To WMR MAt first at splitter SP 1-SP MIn be assigned to gating matrix ST according to power 1-ST MInput connect on (incoming line).The control of switching is undertaken by the multiplexing control light CS of different frequency and amplitude.This control light CS is fed to each gating matrix ST by splitter SP 1-ST MAnd distribute to each WDM subsignal individually by selector SL wavelength selectivity ground and along with these WDM subsignals arrive switch and delay medium SDM by control device CONT.Control light wavelength wavelength selectivity ground determines to be used for the switching function of the packet that will transfer.The amplitude of control light determines corresponding time of delay at this.
Connect by multiplexing control light being fed into input, can select a plurality of individual signals or the packet of different wave length simultaneously.This is at the first wavelength multiplex signals WMR 1Nethermost input two control wavelength X a, λ b connecting be illustrated.Selected packet DP power according to control signal in switch and delay medium SDM is delayed, and with other WDM signal WMR that is received 2To WMR MThe packet of identical wavelength at combiner COM 1To COM PIn be merged into the individual signals of leaving away, and these individual signals are merged into the WDM signal WMT that leaves away 1To WMT PThe channel or the packet of the switching of selected different wave length are directed to combiner (splitter) COM 1-COM POn, by these combiners, the packet of different wave length is merged into the WDM signal WMT that will send again 1To WMT P
The enforcement of gating matrix can for example be carried out at different wave length in different switch aspects (Schaltebene) or in a plurality of levels (dotting).
Fig. 6 illustrates another embodiment of switch SW4, in this embodiment, as among Fig. 5, M WDM signal WMR that arrives 1-WMR MBy splitter SP 1-SP MBe divided into WDM subsignal TS according to power 11-TS MP(number of P=switch matrix).MP WDM subsignal is fed to P switch matrix SMO 1To SMO PIn each switch matrix, from the WDM subsignal, select individual signals/packet and access path V by being distributed respectively k(k=1,2 ..., M) be transferred to combiner COM respectively 1-COM POn.Switch matrix is according to the principles of construction of photon crystal structure, former reason Mehmet Fatih of this photon crystal structure and Shanhui Fan are at PHYSICAL REVIEWLETTERS, and the 92nd rolled up for the 8th phase, on February 27th, 2004, illustrate among the 083901-1 to 083901-4.Identical principle is yet related in other publication, for example by people such as S.Olivier at OPTICSLETTERS, July the 1 day/the 26th calendar year 2001, volume, illustrated in the 1019-1021 page or leaf the 13rd phase.
Switch matrix SMO controls by the signal of telecommunication of control device CONTR in this technology, and the single or more number that can select different wave length is according to bag, and the delay of determining selected signal in addition simultaneously.At this, also realize the demultiplexer function by switch matrix.By shown (multiplexing) access path V kIn each, the packet of different wave length can be transferred to the combiner COM that is distributed 1-COM POn.
Among the switch matrix SMO that symbolically illustrates each all is made of the resonator of a plurality of switch aspects at present, and each switching layer bread contain be tuned to determine the resonator of wavelength and the signal of a certain wavelength of can lingeringly transferring.Correspondingly, signal also must further be divided before input side is entering into switch matrix or switch aspect and must correspondingly be merged at outlet side.The division on plane is possible equally.Connecting again can be by optical fiber, realize in the mode of plane optics or by freely spraying optics.
Fig. 7 illustrates the flexible program SW5 according to the device of Fig. 6, uses wavelength demultiplexer and wavelength multiplexer in this flexible program.Only show " i is individual " (first) switch aspect SMEi of every N the switch aspect (corresponding to N wavelength) of the optical signals/data burst that is used for switching and is used to postpone have definite wavelength i respectively 1-SMEi PEach wavelength multiplex signals WMR 1-WMR MBy wavelength demultiplexer DMUX 1... be divided into the individual signals λ i of wavelength X i (i=1-N) 1-λ i MThese individual signals λ i 1-λ i MIn each all at the splitter SP of input side 1-SP MIn be divided into P subsignal, for example λ i according to power 1Be divided into λ i 11To λ i 1PAnd λ i 2Be divided into λ i 21To λ i 2P(only show subsignal λ i 1PWith λ i 2P).Subsignal connects LRi by input 11To LRi MPBe distributed to NxP switch aspect SMEi 1-SMEi POn, these switch aspects are only constructed at a wavelength X i respectively.Also only show the individual switch aspect of i (first) at a wavelength, and not shown all connections, because otherwise just no longer cheer and bright.Division by wavelength demultiplexer has the following advantages, and realizes that promptly the less power of signal reduces.The switching of packet is by M access path Vi of each switch aspect k(k=1-M) realize.Whole outputs of switch aspect SMEi connect respectively by combiner COM I1-COM IPMerged and be fed to wavelength multiplexer MUX respectively 1-MUX P(first) input, for example output connects LTi at first switch aspect of wavelength i 11-LTi 1MBe fed to the first combiner COMi 1Therefore can be with the wavelength multiplex signals WMR that arrives arbitrarily 1To WMR MWavelength X iEvery number be transferred to each combiner COM arbitrarily according to bag I1-COM IPOn.For the packet of each other wavelength i is operated accordingly.In this case, the transmission time of packet changes continuously by control device CONTR, makes the packet of identical wavelength can be merged into individual signals respectively and these individual signals can be merged into the WDM signal WMT that will send 1-WMT P
Fully flexibly and in the switching device that has good grounds fully, the number of the wavelength demultiplexer of input side can both at random be switched in the mode of burst corresponding to the number (M=P) of the wavelength multiplexer of outlet side and all individual signals/channels.In order to simplify switching device, can certainly in these schemes, limit this flexibility.
Can come the optical loss of compensation arrangement in case of necessity by image intensifer.

Claims (8)

1. the optical switch device (SW1) that is used for packet (DP), these packets are by data channel (the K λ 1 of wavelength multiplexing system (wdm system) 1, K λ 2 1, K λ 3 1...; K λ N 1, K λ N 2, K λ N 3..., K λ N M) be transmitted, this optical switch device has respectively with the WDM signal (WMR that arrives 1, WMR 2..., WMR M) (λ 1 to be divided into individual signals 1, λ 2 1..., λ N 1) wavelength demultiplexer (DMUX 1, DMUX 2... DMUX M), have packet (DPR) that is received by delay element (SD) switching and the optical switch plate of the allocation of packets that is received being given the data channel of determining of leaving away, and has different wave length (the DP λ 1 that will in these data channels, be transmitted respectively, DP λ 2, DP λ 3, ..., DP λ N) packet (DPT) be merged into each WDM signal (WMT who leaves away 1, WMT 2, WMT 3..., WMT P) wavelength multiplexer (WMUX 1-WMUX P),
It is characterized in that,
Be provided with and have a plurality of light input connection (LR1 1, LR1 2, LR1 3..., LRN M) be connected (LT1 with a plurality of light outputs 1, LT2 1, LT3 1..., LTN P) optical switch matrix (SE1-SEN),
Data channel (K λ 1 1, K λ 1 2, K λ 1 3...; K λ 2 1, K λ 2 2, K λ 2 3...; K λ N 1, K λ N 2, K λ N 3..., K λ N M) the packet that is received (DP; DPR1) be fed to each input and connect (LR1 1, LR1 2, LR1 3..., LRN M),
WDM signal (the WMR that guiding is received 1, WMR 2, WMR 3..., WMR M) the packet (DP1 of identical wavelength 1-DPN 1...) input connect (LR1 1, LR1 2, LR1 3..., LR1 MLR2 1, LR2 2, LR2 3..., LR2 MLRN 1..., LRN M) can be transferred to output respectively by optical switch and delay element (SD) and be connected (LT1 1, LT1 2, LT1 3, LT1 P..., LTN P) on,
The continuously adjustable time of delay of control device (CON) control switch and delay element (SD),
Packet (the DP1 of identical wavelength 1-DPN 1...) be transferred to output by in succession order on the time and connect (LT1 1, LT1 2, LT1 3, LT1 P..., LTN P) one of go up and be assigned to thus the WDM signal (WMT that will send 1-WMT P) the data channel of determining, and
The output of the packet (DP) of guiding different wave length connects (LT1 1-LT1 P...) respectively with wavelength multiplexer (MUX 1-MUX P) one of input connect, this wavelength multiplexer is merged into described packet the wavelength multiplex signals (WMT that will send 1-WMT P).
2. optical switch device as claimed in claim 1,
It is characterized in that,
Switch matrix (SE1-SEN) have a plurality of switch aspects (SE1 ..., SEN), and
One of described switch aspect (SE1-SEN) is respectively at the WDM signal (WMR that is received 1-WMR M) a wavelength (λ 1, and λ 2, and λ 3 ..., λ N) set.
3. optical switch device as claimed in claim 1,
It is characterized in that,
Switch matrix (SE1-SEN) have a plurality of switch aspects (SE1 ..., SEN), and
The switch aspect (SEW1 ...) be respectively at the WDM signal (WMR that is received 1-WMR M) one of different wave length (λ 1, and λ 2, and λ 3 ..., λ N) signal set.
4. as the described optical switch device of claim 1,2 or 3,
It is characterized in that,
In switch aspect (SE1-SEN), switch and delay element (SD) are according to the principle arrangement of optical resonator.
5. optical switch device as claimed in claim 1,
It is characterized in that,
Wavelength shifter (WVC) and/or delay element (DG) are linked into that input connects (LRj) and/or output connects in (LTj) and/or other output connects (LTW) and is connected between (LRW) with other input.
6. the optical switch device that is used for packet (DP), these packets are by data channel (the K λ 1 of wavelength multiplexing system (wdm system) 1, K λ 2 1, K λ 3 1...) be transmitted,
WDM signal (the WMR of Dao Daing wherein 1, WMR 2, WMR 3..., WMR M) be divided, and the packet of the identical wavelength that is received (DPR) is transferred by the optical switch plate by in check delay and is assigned to the established data channel, and the packet (DPT) of the different wave length that is transmitted in these data channels then is merged into each WDM signal (WMT who leaves away 1, WMT 2, WMT 3..., WMT P),
It is characterized in that,
Be provided with splitter (SP at input side 1-SP M), these splitters are respectively with the WDM signal (WMR that arrives 1-WMR M) resolve into WDM subsignal (TS by power 11-TS 1P...), these subsignals are assigned to gating matrix (ST respectively 1-ST M) input connect,
WDM signal (the WMR of each arrival 1-WMR M) WDM subsignal (TS 11-TS 1P...) and by gating matrix (ST 1-ST M) be fed to switch and delay medium (SDM),
At each gating matrix (ST 1-ST M) in, have optical control signal (λ a, the λ b of selectable frequency and wavelength; ...) be fed into subsignal (TS 11-TS 1P...) to the access path of switch and delay medium (DM), these control signals are pressed wavelength chooser signal (TS 11-TS 1P...) and the delay of specified data bag (DP) in switch and delay medium (DM),
At outlet side, combiner (COM 1-COM P) being connected switch and delay medium (DM) afterwards, the input of this combiner is assigned to gating matrix (ST respectively 1-ST M) the input path,
Be Controlled time of delay of switch and delay medium (SDM) makes the packet (DP) of identical wavelength be assigned to desired combined device (COM in the mode that is arranged by in succession order on the time 1-COM P), this combiner is with the synthetic wavelength multiplex signals (WMT that leaves away of described data packet group 1-WMT P).
7. the optical switch device that is used for packet (DP), these packets are by data channel (the K λ 1 of wavelength multiplexing system (wdm system) 1, K λ 2 1, K λ 3 1...) be transmitted, and the WDM signal (WMR that wherein arrives 1-WMR M) be divided into subsignal and packet-by-packet transferred by the optical switch plate and be merged into the WDM signal (WMT that leaves away by in check deferred mount 1, WMT 2, WMT 3..., WMT P),
It is characterized in that,
Be provided with splitter (SP at input side 1-SP M), these splitters are respectively with the WDM signal (WMR that arrives 1-WMR M) resolve into WDM subsignal (TS by power 1l-TS 1P...), input connects (LR 11, LR 12, LR 13..., LR 1P...) be assigned to switch matrix (SMO respectively 1-SMO P),
WDM signal (the WMR of each arrival 1-WMR M) WDM subsignal (TS 11-TS 1P...), by each switch matrix (SMO 1-SMO P) be directed into combiner (COM 1-COM P),
At outlet side, combiner (COM 1-COM P) be connected each switch matrix (SMO 1-SMO P) afterwards,
By control device (CONTR) control signal is flowed to each switch matrix (SMO 1-SMO M), these control signals are selected WM subsignal (TS by frequency 11-TS 1P...) the also delay of the definite packet (DP) that will transfer, wherein switch and delay matrix (SMO 1-SMO P) the time of delay of Be Controlled continuously, make the packet (DP) of identical wavelength be assigned to desired combined device (COM in the mode that is arranged by in succession order on the time 1-COM P), and
Combiner (COM 1-COM P) packet (DPT) that will be transferred is merged into the individual signals of identical wavelength and is merged into the WDM signal (WMT that leaves away 1-WMT P).
8. the optical coupling field that is used for packet (DP), these packets are by data channel (the K λ 1 of wavelength multiplexing system (wdm system) 1, K λ 2 1, K λ 3 1...) be transmitted, and the WDM signal (WMR that wherein arrives 1, WMR 2, WMR 3..., WMR M) (λ 1 to be divided into the individual signals of different wave length (λ i) 1, λ 2 1, λ 3 1...; λ 1 2, λ 2 2, λ 3 2...; λ 1 M, λ 2 M, λ 3 M), and the packet (DPR) that arrives transferred by the optical switch plate by in check deferred mount, and the packet of leaving away (DPT) of different wave length is merged into each WDM signal (WMT who leaves away then 1, WMT 2, WMT 3.., WMT P),
It is characterized in that,
Be furnished with wavelength demultiplexer (DMUX at input side 1-DMUX M), these wavelength demultiplexers are respectively with the WDM signal (WMR that arrives 1, WMR 2..., WMR M) be individual signals (λ i by wavelength division 1-λ i M),
Be provided with splitter (SP 1-SP M), these splitters are respectively with individual signals (λ i 1-λ i M) resolve into subsignal (TSi by power 1-TSi P),
Be provided with and have a plurality of controllable switches and delay path (Vi respectively k) switch aspect (SMEi 1-SMEi P), wherein respectively with subsignal (the λ i of identical wavelength (λ i) 1-λ i M) connect (LRi by input 11..., LRi M1...) flow to switch aspect (SMEi 1-SMEi P),
Be furnished with at outlet side and merge a switch aspect (SMEi respectively 1-SMEi P) the combiner (COMi that connects of all outputs 1-COMi M),
Be provided with control unit (CONTR), this control unit is at a switch aspect (SMEi 1...) and in will arrive the packet (DPR) of standing wave really long (λ i) respectively by delay path (Vi k) one of be transferred to output and connect (LTi 11-LTi M1..., LTi MP) on, wherein switch and delay path (Vi k) the time of delay of Be Controlled continuously, make the packet (DPR) of the identical wavelength (λ i) of leaving away be arranged by in succession order on the time, and
Combiner (COMi 1-COMi P) output and wavelength multiplexer (MUX 1-MUX P) connect, these wavelength multiplexer are merged into the WDM signal (WMT that leaves away with the sequence of the packet (DPR) of the different wave length (λ i) of leaving away 1-WMT P).
CNA2005800421391A 2004-12-10 2005-11-11 Optical switching device for data packets Pending CN101171879A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200410059682 DE102004059682A1 (en) 2004-12-10 2004-12-10 Optical switching device for data packets
DE102004059682.4 2004-12-10

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US6195335B1 (en) * 1997-06-27 2001-02-27 International Business Machines Corporation Data switch
GB0018677D0 (en) * 2000-07-28 2000-09-20 Nortel Networks Ltd Optical Buffer
FR2816778B1 (en) * 2000-11-13 2003-02-07 Cit Alcatel WAVELENGTH SELECTION AND CONVERSION DEVICE, AND PHOTON SWITCHING MATRIX INCORPORATING THE SAME
US7120356B2 (en) * 2000-12-14 2006-10-10 Nortel Networks Limited Connection verification for optical switches
JP4030441B2 (en) * 2003-02-26 2008-01-09 富士通株式会社 Optical cross-connect device

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