CN1141817C - Multi-grain optical router based on optical burst switch - Google Patents
Multi-grain optical router based on optical burst switch Download PDFInfo
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- CN1141817C CN1141817C CNB021119651A CN02111965A CN1141817C CN 1141817 C CN1141817 C CN 1141817C CN B021119651 A CNB021119651 A CN B021119651A CN 02111965 A CN02111965 A CN 02111965A CN 1141817 C CN1141817 C CN 1141817C
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Abstract
The present invention relates to a multi-grain optical router based on optical burst switching, which supports the optical switching of burst stages and dynamic wavelength routing stages simultaneously. A core optical router adopts a double optical switch matrix structure to correspond to different switching grains and high-speed optical switch matrix to match with fiber delay line arrays as optical buffering in order to reduce packet loss ratios. A margin optical router simultaneously supports electric port IP access and optical port dynamic wavelength routing network access and can convert arbitrary input wavelengths to arbitrary output wavelengths, so the whole network has dynamic wavelength routing capability. The present invention adopts a mixed signaling mode, the switching of the burst stages adopts a one-way unresponsive signaling mode, and the switching of the dynamic wavelength routing circuit stages adopts an unresponsive signaling mode based on appointment. Signaling information and control information are loaded by a control channel which is independent of a data channel. The present invention can be compatible with current dynamic wavelength routing full optical networks and future pure optical burst switching networks.
Description
Technical field:
The present invention relates to a kind of multiple size light router, relate in particular to a kind of multiple size light router, support exchange of burst level and the circuit switching of dynamic wavelength route level simultaneously, belong to the optical communication technique field based on the light burst-switched.
Background technology:
In recent years, rapid growth along with the Internet and data service, the network bandwidth has been proposed challenge, because be subjected to the light/electricity of network node and the limitation of electricity/optical processing ability and integrated circuit processing speed till now, the data-handling capacity of node has become the electronic bottleneck of further widening the network bandwidth.In order to address this problem, people have proposed many methods that overcome this difficult problem, the light burst-switched is exactly one kind of, it combines the advantage of optical circuit exchange and light packet switching, very likely become the core technology of following high-performance router, occupy critical role (Chunming Qiao and Myungsik Yoo in the all-optical network kind, Optical burst switching (OBS)-a new paradigm fro an optical Internet, Journal of High Speed Networks, 8 (1999), 69-84).The burst duration of light burst-switched (perhaps claiming the exchange granularity) is the microsecond magnitude normally, this mainly is the switching time that is subject to existing optical switch, if make a breakthrough on optical switching technique in the future, the exchange granularity of light burst-switched can further reduce, and even nanosecond.Light burst exchange network comprises data channel and control channel, and the control information of light burst (perhaps claiming the letter head) is responsible for transmission by control channel independently.For improving the bandwidth efficiency of system, the unresponsive signaling method of the general employing of light burst-switched warfare might occur like this on switching node, be to reduce packet loss, is equipped with fibre delay line usually as the light buffer memory on the light burst switching nodes.Typical light burst switching nodes is made of optical switch matrix, exchange control circuit and fibre delay line array usually.
On the other hand, in recent years, wavelength route Optic network technology is ripe gradually, become an important technology (Zeng Qingji who makes up metropolitan area optical network and backbone optical network, Hu Weisheng, Liu Hua, et al, Demonstration of an all-optical metropolitan self-healing ringnetwork test bed, Acta Photonica Sinica＜photon journal 〉, Vol.29, No.3,2000,236-240).The technical characterstic of wavelength route all-optical network is the passage that is used as routing with optical wavelength, and server is to have the optical cross-connect (OXC) of dynamic wavelength allotment ability and have the wavelength optical add/drop multiplexer (OADM) of ability up and down.In wavelength route all-optical network, normally more than the Millisecond, wavelength allotment simultaneously is to be finished by the network management system of network to the time granularity of route allotment, does not need the light buffer memory on network node.OXC and OADM as wavelength route all-optical network node are formed by an optical switch matrix or a plurality of optical switch cascade.
Wavelength route all-optical network has the characteristics of technology maturation, and the light burst-switched has the advantage that realizes the small grain size exchange on the light territory especially, but they also have weak point, and the exchange granularity is single, and the exchanged form underaction does not have interoperability each other.On the one hand, existing dynamic wavelength route all-optical network can't be handled the fine granularity exchange, and on the other hand, allows following light burst exchange network handle the exchange granularity of wavelength routing circuit level, seems very uneconomical again.
Summary of the invention:
The objective of the invention is at the deficiencies in the prior art, a kind of new multiple size light router based on OBS and dynamic wavelength route technology is proposed, make that transmission means and exchanged form in the core optical network are more flexible, both had the big capacity of OBS and the advantage of small grain size exchange, also can satisfy simultaneously the switching requirement of coarseness, and can realize intercommunication with existing dynamic wavelength route optical network, simultaneously again can with pure burst exchange network compatibility in future.
For realizing such purpose, the present invention realizes making in same optical router and uses up burst level exchange and two of dynamic wavelength routing circuit level exchanges exchange granularities, the novel multiple size light router of design comprises core light router and edge optical router, be applied to the core backbone network and the edge network of multiple size light switching network respectively, to satisfy the different demands of core network and edge network.Adopt the optical switch matrix of two kinds of different rates in the core light router, the low speed optical switch matrix is used for the exchange of dynamic wavelength routing circuit level, and the high-speed optical switch matrix is used for the exchange of burst level.The high-speed optical switch matrix is equipped with the packet loss that the fibre delay line array occurs because of competition with reduction as optical buffer.Be equipped with wavelength shifter at input and output, input optical signal is converted to unified interior lights wavelength,, light signal is exchanged on any wavelength of arbitrary port at output configuration wavelength shifter.The edge optical router supports the light of dynamic wavelength route network to insert simultaneously and the electricity of IP bag inserts, on the IP interface, be equipped with the burst wrapper, be equipped with wavelength shifter before and after the optical switch matrix, input signal is exchanged to random wave long channel on the output optical fibre, support dynamic wavelength route and burst-switched function simultaneously.The present invention adopts a kind of mixing signaling method, and unidirectional unresponsive signaling method is adopted in the exchange of burst level, might occur conflict in the switching node, and solution is to come buffer memory the light burst of conflict to occur by the light buffer unit that fibre delay line constitutes; The exchange of dynamic wavelength routing circuit level is adopted the signaling method of replying based on reservation, guarantees can not occur competition and conflict in switching node, thereby need not optical buffer in switching node.Signaling and control information are by the control channel carrying that is independent of data channel.
Mainly by the low speed optical switch matrix of multiplexer, demodulation multiplexer, microsecond level or Millisecond, the high-speed optical switch matrix of nanosecond, wavelength shifter, fibre delay line array, exchange control circuit etc. partly constitute core light router of the present invention.The core light router is characterised in that the exchange granularity that has light burst simultaneously and the exchange granularity of wavelength route, and adopt different resource reservation modes respectively, for wavelength level timeslice (being dynamic wavelength routing circuit level exchange granularity), adopt the two-way appointment mode of replying that has, only under the situation that each node resource is allowed on the desired path, just understand Resources allocation, otherwise refusal inserts.For the burst level, then adopt the mode that need not to reply, fringe node sends burst (the letter head that the time enough is used on each node is handled) after a period of time after sending the letter head.Be switched directly to output for wavelength level optical signals low speed optical switch matrix, owing to signaling method has guaranteed ports competition can not occur, so there is not the light requirement buffer memory from input.For burst level light signal from input, exchange to the high-speed optical switch matrix via the low speed optical switch matrix, again by the output of high-speed optical switch matrix switch to router, output at the high-speed optical switch matrix disposes some fibre delay lines as optical buffer, to reduce the packet loss that causes owing to competition.At the discrepancy end configuration wavelength shifter of core light router, at the output configuration fixed wave length transducer of core light router.The former effect is that any input wavelength is converted to unified router interior operation wavelength, and the latter's effect is to be the wavelength that output optical fibre carried with the internal work wavelength Conversion.In the core light router, the application of friction speed optical switch matrix has guaranteed that router supports different exchange granularities simultaneously, and the application of wavelength shifter has guaranteed the exchange from any input to any output.
Many granularities edge optical router is mainly by dynamic wavelength route network interface, demodulation multiplexer, IP interface, the burst wrapper, semiconductor laser array, wavelength shifter array, optical switch matrix, wavelength shifter array, demodulation multiplexer and control circuit etc. partly constitute.Wavelength level timeslice signal (being dynamic wavelength routing circuit level exchange granularity) or IP bag from input optical fibre insert the edge optical router by dynamic wavelength route network interface (light mouth) and IP interface (electricity mouth) respectively, the wavelength level signal is direct input optical switch matrix behind the wavelength shifter array, and the IP bag is imported laser array after being assembled into burst through the burst wrapper, change input electrical signal the light signal of suitable wavelength into, be input to output optical fibre through multiplexer then.Signaling information and control information are by channel bearing (being independent of data channel) independently.Burst wrapper and semiconductor laser array and wavelength shifter array and all control of controlled circuit of optical switch matrix, control circuit also is responsible for and will be outputed to the control wave long channel after opto-electronic conversion from the signaling information and the local light burst-switched signaling information that produces at dynamic wavelength route networking simultaneously.
The present invention has significant beneficial effect.Core light router of the present invention adopts two optical switch matrix structures, the exchange granularity that the optical switch matrix of different switching rates is corresponding different reduces the packet loss that causes owing to competition thereby grade optical switch matrix of exchange that is used to happen suddenly is equipped with the fibre delay line array as the light buffer memory.Edge of the present invention optical router supports the IP of electricity mouth to insert simultaneously and the dynamic wavelength route network of light mouth inserts, before and after optical switch matrix, be equipped with wavelength shifter, support of the exchange of any input to output, any input wavelength can be converted into any output wavelength, thereby make whole network possess the dynamic wavelength routing capabilities.The present invention simultaneously has been equipped with the burst wrapper for the IP interface, the IP package is dressed up burst forms the light burst through opto-electronic conversion, and can by optical switch matrix and wavelength shifter array with the light burst-switched to the random wave long channel of any port.
Many granularities core light router of the present invention and edge optical router can with existing dynamic wavelength route all-optical network compatibility, simultaneously also can with pure light burst exchange network compatibility in the future.
Description of drawings:
Fig. 1 is many granularities of the present invention switched optical network schematic diagram.
Among the figure 1, be core network in the annulus, core network comprises some many granularities core light router twos.Annulus is outward an edge network, is made of many granularities edge optical router 1, is responsible for being connected of access point and core network.
Fig. 2 is of the present invention based on many granularities of burst-switched exchcange core optical router structural representation.
As shown in Figure 2, the core light router mainly is made up of demodulation multiplexer 3, inlet wavelength shifter 4, Millisecond or microsecond level optical switch matrix 5, nanosecond optical switch matrix 6, fibre delay line array 7, outlet wavelength shifter 8, multiplexer 9, exchange logic control circuit 10.
Fig. 3 is an edge of the present invention optical router structural representation.
As shown in Figure 3, the edge optical router is mainly by dynamic wavelength route network interface 11, demodulation multiplexer 13, IP interface 12, burst wrapper 14, semiconductor laser array 15, wavelength shifter array 16, optical switch matrix 17, wavelength shifter array 18, multiplexer 19, control circuit 20 is formed.
Embodiment:
Be described in detail below in conjunction with the embodiment of accompanying drawing technical solution of the present invention.
The multiple size light router that the present invention is based on the light burst-switched comprises core light router two shown in Figure 1 and edge optical router 1.Some core light router twos constitute core network, and edge optical router 1 constitutes edge network, is responsible for being connected of access point and core network.
As shown in Figure 2, the core light router is mainly by demodulation multiplexer 3, low speed optical switch matrix 5, and high-speed optical switch matrix 6, inlet wavelength shifter 4 partly constitute with outlet wavelength shifter 8, multiplexer 9, fibre delay line array 7 and exchange control circuit 10 etc.The multi-wavelength signals of input optical fibre is connected to low speed optical switch matrix 5 through demodulation multiplexer 3, low speed light open the light matrix 5 two outputs through high-speed optical switch matrix 6 be connected to the outlet wavelength shifter 8, four outputs are directly linked outlet wavelength shifter 8, the light array cache 7 that high-speed optical switch matrix 6 is equipped with three fibre delay lines to form, the output connection multiplexing device 9 of outlet wavelength shifter 8.High-speed optical switch matrix 6, low speed optical switch matrix 5, inlet wavelength shifter 4 and outlet wavelength shifter 8 are all by 10 controls of exchange control circuit.
Each related parts of core light router all can adopt existing mature technology, and wherein multiplexer 9 and demodulation multiplexer 3 can adopt now used film filter plate type multiplexer and demodulation multiplexer usually; Low speed optical switch 5 and high-speed optical switch 6 can adopt mems optical switch and L respectively
iN
bO
3Optical switch; Wavelength shifter 4 and 8 can adopt cross-gain modulation semiconductor optical amplifier and cross-phase modulation semiconductor optical amplifier; Fibre delay line array 7 is made of some optical fiber that are uneven in length; Exchange control circuit 10 comprises photoelectricity, electric light conversion and logic control, and the logic control part can be realized by the FPGA technology.
The concrete operation principle of core light router is as follows: supposition has three input optical fibres, and every optical fiber is supported two wavelength, and the scale of low speed optical switch matrix 5 and high-speed optical switch matrix 6 was respectively for 6 * 6 and 5 * 5 (scale of real system depends on concrete application).Multi-wavelength signals from input optical fibre is decomposed into independent input wavelength channel through demodulation multiplexer 3, by being converted into unified switching node inside wavelength behind the inlet wavelength shifter 4, enter low speed optical switch matrix 5 then, open the light two outputs of matrix 5 of low speed light are connected to high-speed optical switch matrix 6, four outputs are directly linked outlet wavelength shifter 8, concrete port allotment is relevant with network conditions, can regulate arbitrarily.What be connected to high-speed optical switch matrix 6 is burst, and direct output is the timeslice signal of wavelength level.The light array cache 7 that high-speed optical switch matrix 6 is equipped with three fibre delay lines to form is used for reducing the packet loss that brings because of competition, and the scale of light buffer memory and needed packet loss and concrete offered load are relevant.The outlet wavelength shifter 8 of output is converted into the wavelength that meets the configuration of output fiber optic wavelength with the switching node inside wavelength of all light signals.Signaling and control information are by the control channel carrying that is independent of data channel.Exchange control circuit 10 comprises photoelectricity transform portion and logic control part, and it is accepted by control channel next control and signaling information, and these information are transmitted to next switching node.The high-speed optical switch matrix 6 of router interior, low speed optical switch matrix 5, inlet wavelength shifter 4 and outlet wavelength shifter 8 are all by 10 controls of exchange control circuit.
Many granularities of the present invention edge optical router as shown in Figure 3, mainly by dynamic wavelength route network interface 11, IP interface 12, demodulation multiplexer 13, burst wrapper 14, semiconductor laser array 15, wavelength shifter array 16,18, optical switch matrix 17, multiplexer 19 and control circuit 20 etc. partly constitutes.Dynamic wavelength route network interface 11 links to each other with demodulation multiplexer 13, the output of demodulation multiplexer 13 links to each other with optical switch matrix 17 through wavelength shifter array 16, IP interface 12 links to each other with burst wrapper 14, the output of burst wrapper 14 links to each other with semiconductor laser array 15, the output of semiconductor laser array 15 directly links to each other with optical switch matrix 17, and the output of optical switch matrix links to each other with the multiplexer 19 of output through outlet wavelength shifter 18.The unified control of above-mentioned burst wrapper 14, semiconductor laser array 15 and all controlled circuit 20 of optical switch matrix 17.
Needed parts all can adopt existing mature technology in the edge optical router, and wherein multiplexer and demodulation multiplexer can adopt now used film filter plate type multiplexer and demodulation multiplexer usually; Optical switch matrix can adopt mems optical switch or L
iN
bO
3Optical switch; Wavelength shifter is to adopt based on the semiconductor optical amplifier of cross-gain modulation or the semiconductor optical amplifier of modulating based on cross-phase; Semiconductor laser can adopt the semiconductor laser of DFB formula structure or DBR formula structure; The exchange control section comprises photoelectricity, electric light conversion and logic control, and the logic control part can be realized by the FPGA technology.
The concrete operation principle of edge of the present invention optical router is as follows: supposition has an input optical fibre from the dynamic wavelength route network, carry two wavelength, two IP interfaces (in fact concrete network size can be regulated according to application demand) are arranged simultaneously, dynamic wavelength route network interface is an optical interface, and the IP interface is an electrical interface.The wavelength level light signal that comes from optical interface is decomposed into two wavelength through behind the demodulation multiplexer, and is connected to the adjustable wavelength switch array, is connected to optical switch matrix afterwards.From the IP signal input light burst wrapper that the IP interface comes, the IP package is dressed up burst, be connected to laser array afterwards, be connected to optical switch matrix through after the opto-electronic conversion.It all is unified wavelength that the wavelength shifter array guarantees to make the light that enters optical switch matrix, uses the wavelength shifter array and can guarantee to handle input wavelength arbitrarily.Optical switch matrix is responsible for input optical signal is exchanged to suitable port, and the wavelength shifter that links to each other with optical switch matrix to the wavelength that is complementary with output, is connected to output optical fibre through multiplexer with the internal work wavelength Conversion then.Optical switch matrix and wavelength shifter are exchanged the control of control circuit.Signaling information and control information are by the control channel carrying that is independent of data channel.Wavelength shifter before the optical switch matrix and the unified optical switch matrix interior lights wavelength of laser array output, the output of optical switch matrix is connected to wavelength shifter, unified inside wavelength is converted to the optical wavelength that is fit to output optical fibre, is connected to output optical fibre through behind the multiplexer then.
Claims (3)
1, a kind of multiple size light router based on the light burst-switched, comprise core light router (2) and edge optical router (1), it is characterized in that in described multiple size light router, realizing light burst level exchange and two exchanges of dynamic wavelength routing circuit level exchange granularity, the core light router adopts the corresponding different exchange granularity of two optical switch matrix structures, the edge optical router supports electricity mouthful IP to insert simultaneously and light mouth dynamic wavelength route network inserts, described core light router adopts and mixes signaling method, unidirectional unresponsive signaling method is adopted in the exchange of burst level, the exchange of dynamic wavelength routing circuit level is adopted the signaling method of replying based on reservation, and signaling information and control information are by the control channel carrying that is independent of data channel.
2, as the said multiple size light router of claim 1 based on the light burst-switched, it is characterized in that in the core light router, the multi-wavelength signals of input optical fibre is connected to low speed optical switch matrix (5) through demodulation multiplexer (3), low speed light open the light matrix (5) two outputs through high-speed optical switch matrix (6) be connected to the outlet wavelength shifter (8), open the light in addition four outputs of matrix (5) of this low speed light are directly linked outlet wavelength shifter (8), the light array cache (7) that high-speed optical switch matrix (6) is equipped with fibre delay line to form, the output connection multiplexing device (9) of outlet wavelength shifter (8), high-speed optical switch matrix (6), low speed optical switch matrix (5), inlet wavelength shifter (4) and outlet wavelength shifter (8) are all by exchange control circuit (10) control.
3, as the said multiple size light router of claim 1 based on the light burst-switched, it is characterized in that in the edge optical router, dynamic wavelength route network interface (11) links to each other with demodulation multiplexer (13), the output of demodulation multiplexer (13) links to each other with optical switch matrix (17) through wavelength shifter array (16), IP interface (12) links to each other with burst wrapper (14), the output of burst wrapper (14) links to each other with semiconductor laser array (15), the output of semiconductor laser array (15) directly links to each other with optical switch matrix (17), the output of optical switch matrix links to each other with the multiplexer (19) of output through outlet wavelength shifter (18), burst wrapper (14), semiconductor laser array (15) and the controlled circuit of optical switch matrix (17) (20) control.
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| CNB021119651A CN1141817C (en) | 2002-06-06 | 2002-06-06 | Multi-grain optical router based on optical burst switch |
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| CNB021119651A CN1141817C (en) | 2002-06-06 | 2002-06-06 | Multi-grain optical router based on optical burst switch |
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| CN1141817C true CN1141817C (en) | 2004-03-10 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1317838C (en) * | 2004-07-08 | 2007-05-23 | 上海交通大学 | Light burst exchange network edge node structure and realizing method |
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| CN100361427C (en) * | 2004-01-08 | 2008-01-09 | 电子科技大学 | Window feedback retransmission method for optical burst switching systems |
| CN1297120C (en) * | 2004-07-08 | 2007-01-24 | 上海交通大学 | Dynamic adaptation burst assembling method |
| CN100405782C (en) * | 2004-11-02 | 2008-07-23 | 北京大学 | Optical burst exchange route choosing method based on resource forecast |
| CN101155120B (en) * | 2006-09-29 | 2010-05-12 | 华为技术有限公司 | Routing device, routing method and transmission switching network |
| CN1996799B (en) * | 2006-11-30 | 2010-04-14 | 上海交通大学 | Optical packet access method based on the optical and electrical mixed cache structure |
| CN101212818B (en) | 2006-12-26 | 2010-12-08 | 华为技术有限公司 | Network node and buffer device, and scheduling method |
| CN101621719B (en) * | 2009-07-29 | 2012-04-25 | 电子科技大学 | Switch processor matched with core node of hybrid optical switching network |
| CA2929385A1 (en) * | 2013-11-05 | 2015-05-14 | Huawei Technologies Co., Ltd. | Wavelength routing device |
| CN103957477B (en) * | 2014-05-14 | 2018-07-27 | 东南大学 | A kind of light exchange method and network towards electrical network business |
| CN104317000B (en) * | 2014-10-16 | 2018-05-08 | 浙江大学 | The wavelength and space All-optical routing device of modular extendable |
| CN104345391B (en) * | 2014-10-16 | 2018-05-29 | 浙江大学 | The All-optical routing device of modular extendable |
| CN104297853B (en) * | 2014-10-16 | 2018-02-27 | 浙江大学 | Modular wavelength and space All-optical routing device |
| CN104852767B (en) * | 2015-05-26 | 2019-02-15 | 国网智能电网研究院 | A kind of optical network system and transmission method towards sampled value business in substation |
| CN109451377B (en) * | 2018-11-28 | 2021-07-27 | 杭州电子科技大学 | Optical switch based on integrated hybrid switching technology |
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2002
- 2002-06-06 CN CNB021119651A patent/CN1141817C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1317838C (en) * | 2004-07-08 | 2007-05-23 | 上海交通大学 | Light burst exchange network edge node structure and realizing method |
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