CN101093264A - Method for solving link configuration and wavelength allocation competed in OBS by using parallel light fiber - Google Patents
Method for solving link configuration and wavelength allocation competed in OBS by using parallel light fiber Download PDFInfo
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- CN101093264A CN101093264A CN 200610090117 CN200610090117A CN101093264A CN 101093264 A CN101093264 A CN 101093264A CN 200610090117 CN200610090117 CN 200610090117 CN 200610090117 A CN200610090117 A CN 200610090117A CN 101093264 A CN101093264 A CN 101093264A
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Abstract
A method of utilizing parallel optical fiber to solve link structure and relevant wavelength distribution both being competed by data packet in burst exchange includes forming parallel optical fiber link by two parallel optical fibers in the same attribute and connector, designing relevant wavelength distribution means for formed link, using each optical fiber to transmit the same wavelength and using one of them to transmit control information, carrying out wavelength packet on the other wavelength and distributing wavelength in each packet wavelength as per traditional means.
Description
Technical field
The present invention relates to all optical communication technical field, particularly do not have the light buffer memory or only have to utilize parallel optical fiber to solve the link structure and the Wavelength allocation method of burst packet competition in the light burst exchange network in light burst-switched (OBS) network of a little light buffer memory.
Background technology
Wavelength-division multiplex (WDM) technology provides the transmission bandwidth of magnanimity for optical communication, up to a hundred wavelength channels of a bearing optical fiber, transmission bandwidth reaches tens to hundreds of bits per second too, and the core router that uses at present receives high-speed optical signal, through light/electricity conversion back parallel processing, be multiplexed to high-speed optical signal and transmit forward through electricity/light conversion again.Transmit in order to keep the linear speed bag, core router not only needs a large amount of light/electricity/optical switching equipment and a large amount of parallel processings, and need carry out a large amount of multiplexing, demultiplexing.Because the processing power and the exchange velocity of the intrinsic property of electronics restriction Switching Module.The development of current electron exchange and Information Processing Network is near the limit of electronics speed, drawbacks limit such as its intrinsic RC parameter, time jitter, drift, cross-talk, response speed the raising of exchange rate, Here it is " electronic bottleneck ".Because the existence of " electronic bottleneck ", exchange rate is subjected to the restriction of core router backboard speed, and complex structure, the cost costliness.The way that overcomes " electronic bottleneck " is directly to carry out full light exchange.
Full light switching technology is meant without any light/electricity and electricity/light conversion, directly input optical signal is exchanged to the different output terminals of router.Full light switching technology in the research mainly contains: optical circuit exchange (OCS), light burst-switched (OBS) and light packet switch (OPS).Existing researchist is three kinds of light switching technologies relatively, and wherein the light burst-switched has obtained good balance between optical circuit exchange and light packet switch.It combines the advantage of light and electricity, characteristics such as its exchange granularity is moderate, can not rely on the light buffer memory, realize easily, bandwidth availability ratio height can adapt to Network and increase and professional multifarious requirement, swap time, the different mining according to granularity realized with nanosecond and microsecond optical device, can statistic multiplexing optical network band width resource.
Because the light burst-switched is the statistic multiplexing that lacks the light buffer memory, when two or more burst packet require from the same port of node, same wavelength, occurred competition when sending simultaneously.The technology of the solution competition of being studied at present has: use fibre delay line (FDLs) to realize a little light buffer memory at input burst packet place, burst packet is penetrated route, wavelength Conversion and bursty data partially cut apart etc.These technology all are when burst packet is competed, and wherein certain or some bursty datas are wrapped in the OBS intranodal turn to another wavelength, port or optical fiber.They can avoid the conflict at current time OBS node place, but new competition takes place at this node after will causing a period of time with bigger probability.Simultaneously, adopt fibre delay line to realize a little light buffer memory, high-throughput can be provided, can not effectively solve the race problem under the high load condition.Penetrate route partially and realize easily, but be subjected to network size and connective restriction thereof, unfavorablely provide desirable network performance.Wavelength Conversion can reduce average delay and reduce data loss rate, but the long converter technique of all-wave that is that all right is ripe, part wavelength conversion price comparison costliness when offered load is higher, uses part wavelength transfer pair network performance to improve limited.Bursty data is cut apart the minimizing data loss rate, but has increased the realization difficulty of light burst exchange network.
Therefore, study a kind of better burst packet competition settlement mechanism, to avoid fibre delay line, to penetrate and lost efficacy when route, burst packet are cut apart etc. the network high capacity partially, avoid using wavelength conversion expensive, promptly according to existing commercial photoelectric device, design a kind of simple, economic competition solution, remain a hot issue that is worth research.
Summary of the invention
At above-mentioned analysis, the purpose of this invention is to provide a kind of new burst packet competition settlement mechanism---a kind of link structure and respective wavelength distribution method of utilizing parallel optical fiber to solve the competition of light burst-switched burst packet that is used for System of all Optical Communication to present burst packet competition settlement mechanism relative merits.
Technical scheme of the present invention is as follows:
A kind of link structure of light burst exchange network, the joint that is connected with node by the parallel telecommunication optical fiber and the optical fiber two ends of two or many identical traffic characteristics constitutes.Many telecommunication optical fibers with attribute in this parallel optical fiber structure are finished internodal data transmission jointly.
Described identical traffic characteristic refers to that all telecommunication optical fibers in this parallel optical fiber link have identical transport property, each root telecommunication optical fiber all transmits the identical wavelength of same wave long number simultaneously, for example every optical fiber all transmits W+1 wavelength, wherein λ 0 is used for control information transmission, remaining W wavelength is used for transmitting data information, is respectively λ
1, λ
2..., λ
w
The effect of the joint that the optical fiber two ends are connected with node mainly is that telecommunication optical fiber is connected with the OBS node, can realize simultaneously optionally using simultaneously to solve the competition of burst packet with other competition solutions.Such joint can be opened the light and general burst packet contention resolver spare (as fibre delay line, wavelength shifter etc.) formation by light wavelength division multiplexing/demodulation multiplexer, high-speed light.Wherein, with data output optical fibre, the joint design that enters node be: the light wave decomposition multiplex device in the telecommunication optical fiber jointing, each wavelength channel that light wave decomposition multiplex device solves connects a high-speed optical switch, and high-speed optical switch solves device by data packet competition again and/or directly links to each other with the OBS node; With data from the joint design of node input communication optical fiber be: each optical wavelength signal that comes out from node solves device by data packet competition and/or directly links to each other with high-speed optical switch, photoswitch links to each other with light wavelength division multiplexing again, by light wavelength division multiplexing all wavelengths is multiplexed in the telecommunication optical fiber.
When concrete utilization was of the present invention, telecommunication optical fiber was two-way, joint design difference during one-way transmission.During one-way transmission, telecommunication optical fiber out splice going splice structure specifically can be: the light wave decomposition multiplex device in the telecommunication optical fiber jointing, light wave decomposition multiplex device solves the wavelength in the telecommunication optical fiber one by one, each wavelength channel connects a high-speed optical switch, selects to link to each other with the OBS node or directly link to each other with the OBS node by traditional burst packet contention resolver spare (as fibre delay line, wavelength shifter etc.) by high-speed optical switch.The joint and the out splice going splice structure proximate antisymmetry of telecommunication optical fiber input, each optical wavelength signal links to each other with high-speed optical switch or directly links to each other with high-speed optical switch by traditional burst packet contention resolver spare (as fibre delay line, wavelength shifter etc.) by selection behind the node switching structure, high-speed optical switch links to each other with light wavelength division multiplexing again, by light wavelength division multiplexing all wavelengths is multiplexed in the telecommunication optical fiber.When the telecommunication optical fiber transmitted in both directions, the joint design that goes out, goes into telecommunication optical fiber is symmetry fully, and it is telecommunication optical fiber input, partly stack of out splice going splice structure two during by one-way transmission.
Above-mentioned link structure utilizes parallel optical fiber to solve the competition of burst packet in the light burst-switched, and its corresponding Wavelength allocation method is: every optical fiber all transmits identical wavelength X in the parallel optical fiber link structure
0, λ
1, λ
2..., λ
w, be total to W+1 wavelength, wherein λ
0Be used for control information transmission, W the every N of a wavelength wavelength of remainder is divided into one group, and (establishing W can be divided exactly by N, W and N are the integer more than or equal to 1) be used for transmitting data, (for example methods such as First-Fit (adaptive at first), Random (at random) or priority) distribute wavelength according to the conventional method in every group of wavelength.For example work as W=16, during N=4, four wavelength are arranged in every group of wavelength, wherein first group of wavelength is λ
1, λ
2, λ
3, λ
4, at the edge of light burst exchange network, the burst packet after converging is chosen a certain group of wavelength according to destination node to reaching corresponding routing iinformation, in this wavelength selected group, distribute wavelength according to the conventional method then; Simultaneously, specifying the wavelength in the wherein a certain optical fiber is that the main wavelength, other optical fiber medium wavelengths used is from using wavelength, from only enabling when competition takes place burst packet with wavelength.
Burst packet competition settlement mechanism in the light burst exchange network is when competition takes place, use one or more burst packet instead other wavelength, port or Optical Fiber Transmission from original presetted wavelength, port or optical fiber, as previously mentioned the light buffer memory, penetrate route, wavelength conversion partially, and bursty data is cut apart and is taked to transmit again low volume data as far as possible and solve the burst packet competition.
The simplified diagram of the light burst exchange network that link structure of the present invention was suitable for comprises that Access Network, service adaptation converge the parallel optical fiber link of adaptation module and full light delivery module and connection OBS node as shown in Figure 1.Compare with existing burst packet competition settlement mechanism, one or more burst packet that the parallel optical fiber link structure of burst packet competition directly will be competed in this parallel optical fiber solution light burst-switched utilize other wavelength, port or Optical Fiber Transmission to next node.The utilization of this structure increases link capacity realizes, it can solve two or more burst packet competitions.Parallel optical fiber link of the present invention and Wavelength allocation method have be easy to realize, lower-cost characteristics, can be the blocking rate and the packet loss of exponential reduction light burst exchange network.
Description of drawings
Fig. 1 is the simplified diagram of the light burst exchange network that is suitable for of parallel optical fiber link structure of the present invention.
Fig. 2 is the parallel optical fiber link simplified structure diagram of solution light burst packet competition of the present invention.
Fig. 3 is the Wavelength allocation method simplified diagram of parallel optical fiber link structure of the present invention.
Fig. 4 is the NSF network topological diagram that 14 nodes 21 connect.
Fig. 5 is the resulting NSF network packet loss rate performance map shown in Figure 4 of parallel designed according to this invention optical fiber link model and Wavelength allocation method emulation.
Wherein:
1-fibre delay line 2-high-speed optical switch 3-light wavelength division multiplexing
4-light wave decomposition multiplex device
Embodiment
Describe the present invention in detail below in conjunction with accompanying drawing, but the scope that does not limit the present invention in any way.
1. the structured flowchart of Jian Huaing
A kind of simplified structure block diagram that utilizes parallel telecommunication optical fiber to solve the competition of light burst-switched burst packet that the present invention proposes.As shown in Figure 2, parallel optical fiber link adds that by two telecommunication optical fibers with attribute the joint that the optical fiber two ends are connected with node constitutes among the figure, its center tap by light wavelength division multiplexing/demodulation multiplexer, high-speed light open the light, fibre delay line formations such as (FDLs).The two parallel optical fiber with attribute of wavelength-division multiplex (WDM) chain route that connect OBS node i and node i+1 are formed, i.e. parallel optical fiber 0 among Fig. 2 and parallel optical fiber 1.Light signal in the parallel optical fiber is connected with the OBS node through jointing, promptly enters switch fabric module and is switched to corresponding output port, realizes the light signal transparent transmission, promptly full light exchange.
Only consider transmission direction from left to right in this example, be light signal from the OBS node i to OBS node i+1 transmission signals, light signal can be directly links to each other with the high-speed light S that opens the light, and also can enter parallel optical fiber 0 or parallel optical fiber 1 transmits through light wavelength division multiplexing after S is connected with opening the light with high-speed light after fibre delay line F links to each other again.Light signal arrives node i+1 place behind light wave decomposition multiplex device, again through high-speed optical switch with fibre delay line or directly link to each other with node i+1, the full optical switch module that enters OBS node i+1 is switched to corresponding output port.
The present invention propose based on the Wavelength allocation method of parallel optical fiber link as shown in Figure 3, parallel optical fiber is made of two optical fiber with attribute, every Optical Fiber Transmission λ
0, λ
1..., λ
wW+1 wavelength altogether, the wherein wavelength X in every optical fiber
0Be exclusively used in control information transmission, remaining λ
1, λ
2..., λ
wW the every N of a wavelength wavelength is divided into one group altogether, and this W wavelength is used for transmitting user data.
The OBS node that the present invention proposes adopts general OBS node get final product, the switching matrix of OBS node is required absolute clog-free or restructural is clog-free, require simultaneously this switching matrix can be dynamically, flexibly, support the full light of multiple granularity to exchange.
2. concrete organization plan example
Utilizing parallel optical fiber to solve in the structural design of burst packet competition in the light burst-switched, with attribute optical fiber, light wavelength division multiplexing/demodulation multiplexer, high-speed light are opened the light and general burst packet contention resolver spare (as fibre delay line, wavelength shifter etc.) etc. is to make up the basic device that parallel optical fiber link solves the burst packet competition.As an example, select these basic devices of enumerating among the present invention for use, can constitute the parallel optical fiber link of OBS as shown in Figure 2, can constitute the OBS network that blocking rate and packet loss reduce greatly according to Wavelength allocation method shown in Figure 3.
By means of simulation software, the example and the Wavelength allocation method shown in Figure 3 of the parallel optical fiber link model that proposes according to the present invention, set up the NSF light burst exchange network of 14 nodes, 21 connections as shown in Figure 4, circle is represented the node of U.S.'s natural science fund network among the figure, numeral node ID in the circle, the line segment that connects circle is represented parallel optical fiber link, the distance between the numeral node on the line segment, and unit is a kilometer.Fig. 5 has shown the resulting NSF network packet loss rate of emulation performance.SS in the icon of Fig. 5 (Self-similar Source) expression self similarity service source, PS (Poisson Source) expression Poisson traffic source; Have only an optical fiber in SF (single fiber) the expression link model, in DF (dual fiber) the expression link model two parallel optical fiber are arranged; There is 2W wavelength to be used for transmitting user data in every optical fiber of DW (dual wavelengths) expression.Specifically, indicating in the curve representation link model of " DF_SS " has two optical fiber, gained network performance curve when service source adopts the self similarity source; Has only an optical fiber in the curve representation link model of " SF_SS ", gained network performance curve when service source adopts the self similarity source; In the curve representation link model of " DF_PS " two optical fiber are arranged, gained network performance curve when service source adopts the Poisson source; Has only an optical fiber in the curve representation link model of " SF_PS ", gained network performance curve when service source adopts the Poisson source; Have only an optical fiber in the curve representation link model of " SF_DW_SS ", have 2W wavelength to be used for transmitting user data in the every optical fiber, gained network performance curve when service source adopts the self similarity source; Have only an optical fiber in the curve representation link model of " SF_DW_PS ", have 2W wavelength to be used for transmitting user data in the every optical fiber, gained network performance curve when service source adopts the Poisson source.The number of parameters of medium wavelength as a result W=4 shown in Figure 5.
The JET that curve among Fig. 5 all adopts (Just Enough Time) resource reservation protocol, the group bag method at OBS fringe node place is a time span product gate method.Routing Protocol adopts static ospf protocol, and Wavelength allocation method adopts the method for the invention, then adopts the first-fit method in every group of wavelength.As can be seen from Figure 5, be lower than at 0.1 o'clock in network normalization load, the network packet loss rate that adopts two parallel optical fiber (DF) link is than adopting low 3 orders of magnitude of simple optical fiber (SF) link network packet loss; Be higher than 0.1 and be lower than at 0.45 o'clock in network normalization load, the network packet loss rate that adopts two parallel optical fiber (DF) link is than adopting low 2 orders of magnitude of simple optical fiber (SF) link network packet loss.When adopting simple optical fiber (SF) link but take W wavelength (i.e. SF among the figure) respectively and 2W wavelength (i.e. SF_DW among the figure) when transmitting data, the SF_DW network packet loss rate only be can't see difference than SF network packet loss rate in logarithmic coordinate system, actual SF_DW network packet loss rate is only than SF network packet loss rate low 5～7%.
More than be embodiments of the present invention, according to content disclosed by the invention, those of ordinary skill in the art can identical, the replacement scheme of conspicuous some that expect, all should fall into the scope of protection of the invention.
Claims (5)
1. the link structure of a light burst exchange network has the parallel telecommunication optical fiber of identical traffic characteristic and joint that the optical fiber two ends are connected with node constitutes by two or many, and described many parallel optical fiber are finished internodal data transmission jointly.
2. link structure as claimed in claim 1, it is characterized in that, described joint by light wavelength division multiplexing or demodulation multiplexer, high-speed light is opened the light and data packet competition solves device and constitutes, wherein, with data output optical fibre, the joint design that enters node be: the light wave decomposition multiplex device in the telecommunication optical fiber jointing, each wavelength channel that light wave decomposition multiplex device solves connects a high-speed optical switch, and high-speed optical switch solves device by data packet competition again and/or directly links to each other with the OBS node; With data from the joint design of node input communication optical fiber be: each optical wavelength signal that comes out from node solves device by data packet competition and/or directly links to each other with high-speed optical switch, photoswitch links to each other with light wavelength division multiplexing again, by light wavelength division multiplexing all wavelengths is multiplexed in the telecommunication optical fiber.
3. link structure as claimed in claim 2 is characterized in that, it is fibre delay line and/or wavelength shifter that described data packet competition solves device.
4. Wavelength allocation method that utilizes parallel optical fiber link to solve data packet competition in the light burst-switched, specifying one in the parallel optical fiber is main using, remaining is from using, preferentially enable main with the wavelength in the optical fiber, from enabling when competition takes place packet with the wavelength the optical fiber, simultaneously the wavelength that carries out data transmission in the every optical fiber is carried out the wavelength grouping: every optical fiber all transmits identical wavelength X
0, λ
1, λ
2..., λ
w, be total to W+1 wavelength, wherein λ
0Be used for control information transmission, W the every N of a wavelength wavelength of remainder is divided into one group transmits data, wherein W and N are the integer more than or equal to 1, W can be divided exactly by N, edge at light burst exchange network, burst packets after converging is chosen one group of wavelength according to node to reaching corresponding routing iinformation, in this wavelength selected group, distribute wavelength then.
5. Wavelength allocation method as claimed in claim 4 is characterized in that, in every group of wavelength according at first adaptive, at random or the priority method distribute wavelength.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2010057425A1 (en) * | 2008-11-20 | 2010-05-27 | 华为技术有限公司 | Optical switching method and device |
| CN105530068A (en) * | 2015-12-11 | 2016-04-27 | 中国航空工业集团公司西安航空计算技术研究所 | Airborne wavelength division multiplexing network wavelength distribution method based on communication protocol feature hierarchy |
| CN107251494A (en) * | 2015-03-13 | 2017-10-13 | 华为技术有限公司 | A kind of smooth bursty data package transmission method and device |
| CN108353216A (en) * | 2015-09-23 | 2018-07-31 | ROADMap系统有限公司 | Optical system |
| CN108761652A (en) * | 2018-05-30 | 2018-11-06 | 中国科学院半导体研究所 | The multimode optical switching framework with link switching is exchanged for link internal schema |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1719944A (en) * | 2005-07-21 | 2006-01-11 | 上海交通大学 | Double ring shaped optical exchanging system constituted with non-blocking light burst exchange ring exchange node |
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2006
- 2006-06-23 CN CNB2006100901179A patent/CN100478720C/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010057425A1 (en) * | 2008-11-20 | 2010-05-27 | 华为技术有限公司 | Optical switching method and device |
| CN107251494A (en) * | 2015-03-13 | 2017-10-13 | 华为技术有限公司 | A kind of smooth bursty data package transmission method and device |
| CN107251494B (en) * | 2015-03-13 | 2020-05-08 | 华为技术有限公司 | Optical burst data packet transmission method and device |
| CN108353216A (en) * | 2015-09-23 | 2018-07-31 | ROADMap系统有限公司 | Optical system |
| CN108353216B (en) * | 2015-09-23 | 2021-12-10 | ROADMap系统有限公司 | Optical system |
| CN105530068A (en) * | 2015-12-11 | 2016-04-27 | 中国航空工业集团公司西安航空计算技术研究所 | Airborne wavelength division multiplexing network wavelength distribution method based on communication protocol feature hierarchy |
| CN105530068B (en) * | 2015-12-11 | 2018-09-21 | 中国航空工业集团公司西安航空计算技术研究所 | A kind of airborne wavelength division multiplexed network Wavelength allocation method based on the classification of communication protocol characteristic |
| CN108761652A (en) * | 2018-05-30 | 2018-11-06 | 中国科学院半导体研究所 | The multimode optical switching framework with link switching is exchanged for link internal schema |
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