CN100568778C - A kind of new multilayer multiple size light cross connection device - Google Patents
A kind of new multilayer multiple size light cross connection device Download PDFInfo
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- CN100568778C CN100568778C CN 200610054478 CN200610054478A CN100568778C CN 100568778 C CN100568778 C CN 100568778C CN 200610054478 CN200610054478 CN 200610054478 CN 200610054478 A CN200610054478 A CN 200610054478A CN 100568778 C CN100568778 C CN 100568778C
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Abstract
The present invention relates to a kind of novel multilayer multi-granularity optical cross connect (MG-OXCs) structure, belong to optical communication and network category.Compare with traditional multilayer MG-OXCs, the present invention is directed to problems such as the loss of signal of existing optical exchange structure and distortion be excessive, by in the link block of introducing on traditional multilayer MG-OXCs basis between optical fiber level and the wavestrip level, FXC space exchange unit is connected with W2F (wavelength is to optical fiber) link block by F2W (optical fiber is to wavelength) with WXC space exchange unit.Dredging the switching matrix that corresponding signal directly enters corresponding level exchanges.Reach and improve the exchange flexibility, reduce the purpose of loss of signal and distortion.
Description
Technical field:
The present invention relates to fiber optic communication field, relate in particular to the switching node structure in a kind of optical switching network.
Background technology:
Many granularity exchanges are meant that switching node can exchange multiple varigrained light signal simultaneously, mainly comprises optical fiber level signal, wavestrip level signal, and wavelength level signal.Wherein the wavestrip signal is made up of the wavelength of some, and at the switching node place, a wavestrip signal that comprises some wavelength signals only uses a switching port, and traditional switching fabric need adopt the switching port that equates with number of wavelengths.Wavestrip is meant one group of continuous wavelength channel, and the wavelength number that comprises in the wavestrip can be fixed, and also can change.In the multiple size light switching network that multiple size light interconnection (MG-OXCs) is formed, FXC (optical fiber interconnection) finishes the space switching of optical-fibre channel, BXC (wavestrip interconnection) finishes the exchange of wavestrip level, because wavestrip is made up of the wavelength channel of some (as n), a wavestrip port can be finished the exchange of n wavelength.WXC (wavelength interconnection) finishes the exchange of wavelength level.A wavestrip has only when having wavelength to exchange therein just need be demultiplexed into wavelength level.
The introducing of many granularities exchange makes that switching port quantity is able to remarkable reduction in the switching node.Present many granularities switching fabric comprises individual layer, multilayer, structures such as cascade.As Ludovic Noirie, the individual layer multiple size light cross connecting structure that Martin Vigoureux and Emmanuel Dotaro mention (Impact of intermediategrouping on the dimensioning of multi-granularity optical networks, in Proceedings-OFC, 2001, p.TuG3-1) and Xiaojun Cao, the multilayer multiple size light cross connecting structure (Performance Evaluation of Wavelength Band Switching inMulti-fiber All-Optical Networks.IEEE INFOCOM 2003) that people such as Vishal Anand mention.
The core of multilayer multi-granularity cross connecting structure is FXC, BXC, three switching matrixs of WXC.With the difference of individual layer MG-OXC be between its three switching matrixs all ports having be connected, increased the flexibility of exchange.FXC directly is connected by the wavestrip multiplexing demultiplexing device with BXC, and BXC directly is connected by wavelength multiplexing/demodulation multiplexer with WXC, and each switching matrix provides road port up and down.Directly be not connected between FXC and the WXC.The necessary elder generation of the exchange of lower floor is through the switching matrix on upper strata.If there is wavelength will carry out the exchange of wavelength level in the optical fiber, in the FXC switching matrix, exchange to earlier FTB (Fiber to Band) port, demultiplex into single wavestrip by the wavestrip demodulation multiplexer and in the BXC switching matrix, exchange to BTW (Band toWavelength) port, demultiplex into single wavelength by wavelength demultiplexer and in WXC, finish exchange.If signal continues transmission downstream, then successively return the optical fiber output port from lower floor's switching matrix through opposite process.
The light signal of each granularity of multilayer multiple size light cross connecting structure of the prior art exchanges in the middle of can entering corresponding light chi structure, but, undermost exchange must be through the exchange on upper strata, if promptly there is signal demand in the wavelength interconnection, to exchange, it needs to exchange by the optical fiber interconnection in affiliated optical fiber earlier, in affiliated wavestrip, exchange then by the wavestrip interconnection, just be demultiplexed back into wavelength at last, in the wavelength interconnection, exchange.Signal exchanges through path like this, must increase loss, has brought bigger distortion.
Summary of the invention;
The objective of the invention is to shortcoming at traditional multilayer multiple size light cross connecting structure, traditional multilayer multiple size light cross connecting structure is expanded, propose a kind of multilayer multi-granularity optical cross connection device, solve the bigger defective of its loss of signal and distortion.
The technical scheme that the present invention solves the problems of the technologies described above is, a kind of new multilayer multiple size light cross connection device is proposed, this multilayer multi-granularity optical cross connection device is mainly by FXC space exchange unit, BXC space exchange unit, link block between WXC space exchange unit and the space exchange unit is formed, connect by the link block of correspondence respectively between three kinds of space exchange unit, be specially, the part output of optical fiber interconnection space exchange unit (101) is by the part input of optical fiber to wavestrip link block F2B (10103) connection wavestrip interconnection space exchange unit (102), and the part output of wavestrip interconnection space exchange unit connects the part input of optical fiber interconnection space exchange unit to optical link module B2F (10203) by wavestrip; The part output of optical fiber interconnection space exchange unit (101) is by the part input of optical fiber to wavelength link block F2W (10104) connection wavelength interconnection space exchange unit (103), and the part output of wavelength interconnection space exchange unit (103) connects the part input of optical fiber interconnection space exchange unit to optical link module W2F (10304) by wavelength; The part output of wavestrip interconnection space exchange unit (102) is by the part input of wavestrip to wavelength link block B2W (10204) connection wavelength interconnection space exchange unit (103), and the part output of wavelength interconnection space exchange unit (103) is connected to the part input of wavestrip interconnection space exchange unit (102) to wavestrip link block W2B (10303) by wavelength.The part output port of FXC space exchange unit (101) is by the part input port of optical fiber to wavelength link block F2W (10104) connection WXC space exchange unit (103), and the part output port of WXC space exchange unit connects the part input port of FXC space exchange unit to optical link module W2F (10304) by wavelength.FXC space exchange unit is made of the optical fiber cross-connect matrix, BXC space exchange unit is made of the wavestrip cross-connect matrix, WXC space exchange unit is made of the wavelength cross-connect matrix, and above-mentioned space exchange unit is respectively optical fiber, wavestrip, wavelength road port up and down is provided.Optical fiber is made of the demodulation multiplexer parallel connection of a series of optical fiber to wavelength to wavelength link block F2W, and wavelength is made of the multiplexer parallel connection of a series of wavelength to optical fiber to optical link module W2F.
The present invention adopts corresponding link block to be connected between FXC space exchange unit and WXC space exchange unit, needing directly to enter wavelength signals that WXC space exchange unit exchanges in the middle of the optical fiber one stage signal can directly be demultiplexed among the WXC and exchange, and need not by BXC space exchange unit, reduced like this signal the exchange device of process, reduce its loss and distortion.And directly on traditional multilayer multiple size light cross connecting structure basis, expand, simple in structure.
Description of drawings
Fig. 1 is a new multilayer multiple size light cross connection device structural representation of the present invention
Fig. 2 is the principle assumption diagram of optical fiber to the wavelength link block
Fig. 3 is the principle assumption diagram of wavelength to optical link module
Reference numbers among the figure each parts and the port corresponding with it is respectively: 101: optical fiber space exchange unit, 10101: road port on the optical fiber; 10102: road port under the optical fiber, 10103: optical fiber is to wavestrip link block (F2B), 10104: optical fiber is to wavelength link block (F2W), 102: wavestrip space exchange unit, 10201: road port on the wavestrip, 10202: road port under the wavestrip, 10203: wavestrip is to optical link module (B2F), 10204: wavestrip is to wavelength link block (B2W), 103: wavelength space crosspoint, 10301: road port on the wavelength, 10302: road port under the wavelength, 10303: wavelength is to wavestrip link block (W2B), and 10304: wavelength is to optical link module (W2F).
Embodiment
Figure 1 shows that the said new multilayer multiple size light cross connection device of the present invention structural representation.Its main part is connected and composed by corresponding link block by the space exchange unit of optical fiber, wavestrip, three kinds of granularities of wavelength.The output of the part of FXC space exchange unit (101) is connected to the part input of BXC space exchange unit (102) by optical fiber to wavestrip link block F2B (10103), and the part output of BXC space exchange unit is by the part input of wavestrip to optical link module B2F (10203) connection FXC space exchange unit; The part output of FXC space exchange unit (101) is by the part input of optical fiber to wavelength link block F2W (10104) connection WXC space exchange unit (103), and the part output of WXC space exchange unit (103) connects the part input of FXC space exchange unit to optical link module W2F (10304) by wavelength; The part output of BXC space exchange unit (102) is by the part input of wavestrip to wavelength link block B2W (10204) connection WXC space exchange unit (103), and the part output of WXC space exchange unit (103) is connected to the part input of BXC space exchange unit (102) to wavestrip link block W2B (10303) by wavelength; The remaining input terminal mouth of three kinds of granular space crosspoints (10101,10201,10301) conduct last road port separately, optical fiber, wavestrip, wavelength signals can directly be set out on a journey by above-mentioned port, all the other output ports of three kinds of granular space crosspoints (10102,10202,10302) conduct following road port separately, optical fiber, wavestrip, wavelength signals can directly be descended the road by above-mentioned port.
Link block between each granularity is made of corresponding multiplexing demultiplexing device.Be specially: optical fiber is made of the demodulation multiplexer parallel connection of a series of optical fiber to wavestrip to wavestrip link block F2B; Wavestrip is made of the multiplexer parallel connection of a series of wavestrips to optical fiber to optical link module B2F; Wavestrip is made of the demodulation multiplexer parallel connection of a series of wavestrips to wavelength to wavelength link block B2W; Wavelength is made of the multiplexer parallel connection of a series of wavelength to wavestrip to wavestrip link block W2B; Optical fiber constitutes (as shown in Figure 2) by a series of optical fiber to the demodulation multiplexer parallel connection of wavelength to wavelength link block F2W; Wavelength constitutes (as shown in Figure 3) by a series of wavelength to the multiplexer parallel connection of optical fiber to optical link module W2F.The quantity of concrete multiplexing and demodulation multiplexer is determined according to the demand of transmission volume in the link block.
The space exchange unit of various granularities is made of corresponding cross-linked matrix, be that FXC space exchange unit is made of the optical fiber cross-connect matrix, BXC space exchange unit is made of the wavestrip cross-connect matrix, WXC space exchange unit is made of the wavelength cross-connect matrix, and above-mentioned space exchange unit is respectively optical fiber, wavestrip, wavelength road port up and down is provided.
The present invention on existing multilayer multi-granularity optical cross connect MG-OXCs basis, increased optical fiber to the link block F2W of wavelength port and wavelength to fiber port link block W2F, make FXC space exchange unit can directly link to each other by above-mentioned port with WXC space exchange unit.Like this, needing directly to enter wavelength signals that WXC space exchange unit exchanges in the middle of the optical fiber one stage signal can directly be demultiplexed among the WXC and exchange, and need not by BXC space exchange unit, reduced like this signal the exchange device of process, reduce its loss and distortion.
This multilayer multiple size light cross connecting structure has following feature,
1. the present invention structurally is connected FXC space exchange unit and BXC space exchange unit with wavestrip to optical link module B2F to wavestrip link block F2B with optical fiber; Be connected BXC space exchange unit and WXC space exchange unit with wavelength to wavestrip link block W2B to wavelength link block B2W with wavestrip; Again FXC space exchange unit is connected to optical link module W2F with wavelength to wavelength link block F2W with optical fiber with WXC space exchange unit.The function of road up and down of corresponding light signal all is provided on three kinds of light cross connecting structures.
2. the cross-coupled control unit of multilayer multiple size light directly demultiplexes into wavelength signals at the node place with the wavelength signals that only need carry out the wavelength level exchange from optical fiber level signal, makes it be able to directly exchange in WXC.Directly being multiplexed with optical fiber level signal after exchange is finished transmits downstream.Need earlier then to demultiplex into the wavestrip signal earlier, in wavestrip interconnection (BXC), finish the exchange of wavestrip level, and then demultiplexing is wavelength signals, in wavelength interconnection (FXC), finish the exchange of wavelength level through the wavelength signals of wavestrip level exchange.After finishing, exchange is multiplexed into transmission downstream in the optical fiber through reverse path again.
Lift an example below and describe,
Suppose 8 optical fiber of FXC input in this switching node place light cross connecting structure, be output as 8 optical fiber, every optical fiber comprises 40 wavelength, and these 40 wavelength are divided into 10 wavestrips, 4 wavelength of each wavestrip.In this example, the wavestrip granularity is 4.In these 8 optical fiber, have and contain a wavelength signals λ 1 among the optical fiber A and need directly enter WXC and exchange, all the other 39 wavelength signals belong to by-passing signal; After containing needs among the other optical fiber B and exchanging in BXC earlier, enter the wavelength signals λ 2 that WXC exchanges again, all the other are by-passing signal; And other fiber-optic signals belong to by-passing signal.
Optical fiber A directly exchanges to optical fiber in wavelength link block (10104) in FXC space exchange unit (101), be demultiplexed into the exchange of finishing among the WXC λ 1 by 10104 then, be that to multiplexing the entering of optical link module (10304) fiber-optic signal continues transmission downstream by wavelength again, this process do not need through BXC space exchange unit (102) and and other space exchange unit between corresponding link block (10103,10204,10303 and 10203);
Optical fiber B exchanges to optical fiber in wavestrip link block (10103) in FXC space exchange unit (101), demultiplexing is behind the wavestrip signal this wavestrip signal to be exchanged to wavestrip in wavelength link block (10204) in BXC space exchange unit (102), be wavelength signals by demultiplexing then, make wavelength signals λ 2 in WXC, finish exchange, earlier be multiplexed into wavestrip to wavestrip link block (10303) according to reverse path at last, be multiplexed into transmission downstream in the optical fiber by wavestrip to optical link module (10203) again by wavelength.
The present invention dredges the wavelength signals that needs directly to exchange and directly enters WXC and exchange in WXC space exchange unit, increase the flexibility of exchange, has reduced loss of signal and distortion; Have simple in structure; And can adjust the quantity of all kinds switching port flexibly, realize effective reduction of exchange cost.
Claims (3)
1. multilayer multi-granularity optical cross connection device, the part output of optical fiber interconnection space exchange unit (101) is by the part input of optical fiber to wavestrip link block F2B (10103) connection wavestrip interconnection space exchange unit (102), and the part output of wavestrip interconnection space exchange unit connects the part input of optical fiber interconnection space exchange unit to optical link module B2F (10203) by wavestrip; The part output of optical fiber interconnection space exchange unit (101) is by the part input of optical fiber to wavelength link block F2W (10104) connection wavelength interconnection space exchange unit (103), and the part output of wavelength interconnection space exchange unit (103) connects the part input of optical fiber interconnection space exchange unit to optical link module W2F (10304) by wavelength; The part output of wavestrip interconnection space exchange unit (102) is by the part input of wavestrip to wavelength link block B2W (10204) connection wavelength interconnection space exchange unit (103), and the part output of wavelength interconnection space exchange unit (103) is connected to the part input of wavestrip interconnection space exchange unit (102) to wavestrip link block W2B (10303) by wavelength; It is characterized in that, the part output port of optical fiber interconnection space exchange unit (101) is by the part input port of optical fiber to wavelength link block F2W (10104) connection wavelength interconnection space exchange unit (103), and the part output port of wavelength interconnection space exchange unit connects the part input port of optical fiber interconnection space exchange unit to optical link module W2F (10304) by wavelength.
2. multilayer multi-granularity optical cross connection device as claimed in claim 1, it is characterized in that, optical fiber interconnection space exchange unit is made of the optical fiber cross-connect matrix, wavestrip interconnection space exchange unit is made of the wavestrip cross-connect matrix, wavelength interconnection space exchange unit is made of the wavelength cross-connect matrix, and above-mentioned space exchange unit is respectively optical fiber, wavestrip, wavelength road port up and down is provided.
3. multilayer multi-granularity optical cross connection device as claimed in claim 1 or 2, it is characterized in that, optical fiber is made of the demodulation multiplexer parallel connection of a series of optical fiber to wavelength to wavelength link block F2W, and wavelength is made of the multiplexer parallel connection of a series of wavelength to optical fiber to optical link module W2F.
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| CN106658238A (en) * | 2016-10-28 | 2017-05-10 | 北京邮电大学 | Multi-granularity quantum switching node architecture for quantum communication |
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Non-Patent Citations (4)
| Title |
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| 下一代光网络中多粒度交换技术的研究. 蒋晓通，叶东银，杨国锋.光子技术，第2005年第3期. 2005 |
| 下一代光网络中多粒度交换技术的研究. 蒋晓通，叶东银，杨国锋.光子技术，第3期. 2005 * |
| 多粒度光交换技术的研究. 殷洪玺，张宇，郭中梅，全海峰，徐安士.北京大学学报（自然科学版），第41卷第3期. 2005 |
| 多粒度光交换技术的研究. 殷洪玺，张宇，郭中梅，全海峰，徐安士.北京大学学报(自然科学版)，第41卷第3期. 2005 * |
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