CN101370315A - Sharing type optical packet switching node structure based on inside wavelength - Google Patents
Sharing type optical packet switching node structure based on inside wavelength Download PDFInfo
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- CN101370315A CN101370315A CNA2008102002241A CN200810200224A CN101370315A CN 101370315 A CN101370315 A CN 101370315A CN A2008102002241 A CNA2008102002241 A CN A2008102002241A CN 200810200224 A CN200810200224 A CN 200810200224A CN 101370315 A CN101370315 A CN 101370315A
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Abstract
The invention relates to a shared optical packet exchange node structure based on internal wavelength comprising wavelength-division demultiplexer, adjustable wavelength shifter, optic switch matrix, wavelength-division multiplex, optical fiber delay line, splitter, SOA light gate, passive coupler. Using a group of shared optical fibre delay line for solving competition of light grouping, and increasing optical buffer capacity by internal wavelength method, Solving FDL competition of shared optical cache; Each optical fibre delay line being degeneratively arranged, Each optical fibre delay line cache wavelength comprising transmission wavelength in input/output optical fiber, and also increasing proper internal wavelength to enlarge capacity of optical cache according to need, introducing extra internal wavelength to optical fibre delay line to enhance capacity of FDL optical cache; Node structure with compact appearance being simply controlled. Packet loss rate can be largely reduced for exchange node without increasing optical packet cache time delay, which effectively solves FDL competition problem of shared optical cache.
Description
Technical field
The present invention relates to the shared formula optical packet switching node structure in a kind of optical communication technique field, especially a kind of based on inside wavelength, be applicable to the shared formula optical packet switching node structure of optical packet switch network.
Background technology
In recent years, the Internet traffic carrying capacity increases fast with index law, and IP operation has become the main business of communication network.Meanwhile, be that the optical transfer network (OTN) of platform can provide at a high speed, jumbo transmission bandwidth with wavelength division multiplexing (WDM) technology.Yet an electricity layer IP network is to be grouped into cross-over unit with IP, and its business has very strong sudden, and optical transfer network is to be unit of transfer with the overall optical wavelength.How the IP packet map is utilized with realization transmission bandwidth resources effective on optical wavelength, become the focus of research in the last few years.Light packet switching (OPS:Optical Packet Switching) technology with its at a high speed, transparent and exchange granularity is moderate etc., and characteristics are generally believed it is a kind of ideal solution that can realize IP network and optical transport network seamless link.
The optical packet switching node structure design is the key technology that realizes the light packet switching.In the light Packet Switch Node, the solution of light grouping competition is the emphasis of node structure design.At present, the method that solves the light grouping competition has three kinds: light buffer memory, wavelength conversion and penetrate route partially.In these three kinds competition solutions, the light buffer memory is the most effective a kind of.Under current technical conditions, the light buffer memory can only be made of fiber delay line (FDL:Fiber Delay Line), therefore is also referred to as FDL light buffer memory.The operation principle of FDL light buffer memory is to utilize the propagation delay of light in optical fiber, selects the fiber delay line of length-specific according to the needs of time-delay.The capacity of FDL light buffer memory is by three factors decisions such as number of optical wavelength among the length of the quantity of FDL in the buffer memory, FDL, the FDL.According to the difference of FDL present position in the light Packet Switch Node, the light buffer memory can be divided into output type light buffer memory, input type light buffer memory, feedback light buffer memory and shared formula light buffer memory.In disposing the optical packet switching node structure of sharing formula light buffer memory, all output ports of node are shared the competition that one group of FDL is used to solve the light grouping, and such node structure is called shares the formula optical packet switching node structure.
In shared formula optical packet switching node structure, when a certain light grouping arrives, according to specific packet scheduling algorithm, this grouping will be cached among the FDL of length-specific, yet because the FDL that is disposed is shared by all output ports, the light grouping that this FDL may have been arrived previously is shared, and this phenomenon is called the FDL competition.The FDL competition can worsen the performance of switching node, and the method that solves the FDL competition at present has two kinds, and a kind of method is that this method can be optimized the performance of node to a certain extent for light divides group selection suitable dispatching algorithm, but the degree of optimizing is very limited; Another kind method is the capacity that increases FDL light buffer memory; In the shared formula optical packet switching node structure that has proposed at present, the solution of FDL competition all is length and the quantity by increase FDL, thereby the capacity that increases FDL light buffer memory is realized.Yet length by increasing FDL and quantity realize that the increase of FDL light buffer memory capacity can introduce bigger caching delay.In addition, also can cause the increase of switching node port number, thereby increase the construction cost of light Packet Switch Node.
Summary of the invention
The present invention will provide a kind of shared formula optical packet switching node structure based on inside wavelength, this structure is by using extra optical wavelength in FDL light buffer memory, make that the capacity of FDL light buffer memory is increased, thereby under the prerequisite that does not increase caching delay, solve preferably by FDL and compete the problem that caused joint behavior worsens.
For realizing such purpose, technical scheme of the present invention is as follows:
A kind of shared formula optical packet switching node structure based on inside wavelength, comprise Wave decomposing multiplexer, tunable wavelength converter, optical switch matrix, wavelength division multiplexer, fiber delay line, shunt selected cell, SOA optical gate, passive coupler and connect optical fiber, be characterized in:
Configuration is shared the formula fiber delay line for one group on the cache exchanging output port of optical switch matrix, be used to solve the competition of light grouping, have a plurality of optical wavelength in the every fiber delay line and come the grouping of buffer memory light, each fiber delay line is degeneracy and arranges, promptly, the light grouping of two unit lengths of each wavelength storage in the light grouping of a unit length of each wavelength storage in first fiber delay line, second fiber delay line, the rest may be inferred; Every group cache exchanging output port of optical switch matrix connects a fiber delay line by a wavelength division multiplexer, connect a Wave decomposing multiplexer behind the every fiber delay line again and carry out demultiplexing, each road signal behind the demultiplexing is through a shunt selected cell, this road signal is delivered on the passive coupler of destination node output port, the path that belongs to transmission wavelength is directly linked on the wavelength division multiplexer of node output port, the path that belongs to inside wavelength then connects a tunable wavelength converter earlier, and then is connected to corresponding node output optical fibre by the wavelength division multiplexer on the node output port; The buffer memory capacity of sharing the formula fiber delay line increases by the quantity that increases the buffer memory wavelength; Port number in the optical switch matrix in every group cache exchanging output port is greater than the number of wavelengths in the every I/O optical fiber.
Sharing formula light Packet Switch Node left side is the node input port, the switching node right side is the node output port, the left side of optical switch matrix is the exchange input port, the optical switch matrix right side is straight-through output port of exchange and cache exchanging output port, at each node input port, every input optical fibre is behind a Wave decomposing multiplexer demultiplexing, and each road optical fiber links to each other with a tunable wavelength converter respectively again, and tunable wavelength converter is received the exchange input port of optical switch matrix.
Shunt selected cell in the node structure connects one group of parallel SOA optical gate after by a splitter to be formed, and the quantity of SOA optical gate equals the node number of output ports.
The invention has the beneficial effects as follows: node structure proposed by the invention is not only applicable to the packet switching of time slot light, is applicable to the packet switching of non-time slot light yet.The shared formula fiber delay line that node structure disposed can be shared by each input channel, thereby the buffer memory capacity of fiber delay line can be fully utilized.Buffer memory wavelength in every fiber delay line can also increase suitable inside wavelength as required except comprising transmission wavelength.When FDL competition took place, the light grouping that competition takes place can be cached on the inside wavelength in the same fibre delay line, therefore can solve the FDL race problem effectively.The introducing of inside wavelength can increase the capacity of FDL light buffer memory exponentially, greatly reduces the packet loss of switching node.With compared with the light buffer memory expansion method of quantity by the length that increases FDL in the past, inside wavelength buffer memory expansion method is not owing to increase the buffer memory degree of depth of FDL light buffer memory, therefore node structure proposed by the invention can not increase the caching delay of light grouping.In addition, owing to need not dispose extra fiber delay line, node structure will be more compact also.
Prove that through emulation experiment to node structure proposed by the invention, only need introduce a spot of inside wavelength in node structure, the packet loss performance of node just can be greatly improved.Simultaneously, light grouping control algolithm proposed by the invention realizes simple, and the packet loss performance of node is further optimized.Optical packet switching node structure of the present invention can be used to make up various forms of optical network structures, as ring of light net, light multi-ring network and light mesh etc., can be applied in backbone optical network and the metropolitan area optical network.
Description of drawings
Fig. 1 is an optical packet switching node structure schematic diagram of the present invention.
Embodiment
In order to understand technical scheme of the present invention better, execution mode is further described below in conjunction with accompanying drawing.
Optical packet switching node structure of the present invention is made up of a plurality of Wave decomposing multiplexers 2, tunable wavelength converter 3, optical switch matrix 4, wavelength division multiplexer 12, fiber delay line (FDL) 5, splitter 7, semiconductor optical amplifier (SOA) optical gate 8, passive coupler 6 and connection optical fiber as shown in Figure 1.
There is N node input port 13 in the left side of switching node, and each node input port 13 connects an input optical fibre 1; There is N node output port 14 on the right side of switching node, and each node output port 14 connects an output optical fibre 9.Can capacity W transmission wavelength (λ in the I/O optical fiber 1,9
j, j ∈ 1 ..., W}).The core function of exchange of switching node is finished by optical switch matrix 4, there is one group of exchange input port in the left side of optical switch matrix 4, there are two groups of output ports on optical switch matrix 4 right sides, above one group be the straight-through output port of exchange, below one group of output port be the cache exchanging output port.
Node structure of the present invention also disposes one group (B root) and shares the competition that formula fiber delay line (FDL) 5 solves the light grouping on the cache exchanging output port of optical switch matrix 4.(degenerate) mode of degeneracy is adopted in the arrangement of each fiber delay line 5, promptly, each wavelength can be stored the light grouping of a unit length in first fiber delay line, and each wavelength can be stored the light grouping of two unit lengths in second fiber delay line, and the rest may be inferred.The cache exchanging output port of optical switch matrix 4 is divided into B group by the number of the FDL that is disposed, the corresponding FDL of every group cache exchanging output port.Buffer memory wavelength among every FDL comprises two parts, and a part is that quantity is the transmission wavelength (λ of W
j, j ∈ 1 ..., W}), another part is that quantity is the inside wavelength (λ of m
k, k ∈ W+1 ..., W+m}), wherein m can get different values as required.Therefore, always have W+m buffer memory wavelength (λ among every FDL
k, k ∈ 1 ..., W, W+1 ..., W+m}), can effectively increase the capacity of FDL light buffer memory by this inside wavelength method.In order to realize this function, every group cache exchanging number of output ports is W+m.
At each node input port 13, every input optical fibre 1 is behind Wave decomposing multiplexer 2 demultiplexings, each road optical fiber links to each other with a tunable wavelength converter (TWC) 3 respectively again, each tunable wavelength converter (TWC) 3 is received the exchange input port of optical switch matrix 4 more respectively, and the quantity of exchange input port is N * W.The straight-through output port of the exchange of optical switch matrix 4 is divided into N group, every group exchange corresponding node output port of straight-through output port and an output optical fibre, and there be W the straight-through output port of exchange in every group.Each port in the straight-through output port of every group exchange is received on the corresponding node output port by a passive coupler 6 on the node output port 14 respectively.
Each node output port 14 comprises W+m road output channel, wherein: corresponding W the transmission wavelength channel of preceding W road output channel, corresponding m the inside wavelength channel of m road, back output channel.Because every road output channel of node output port 14 will insert multiple signals, therefore a passive coupler 6 is arranged on the output channel of every road.For preceding W road output channel, each passive coupler 6 directly links to each other with the wavelength division multiplexer 12 of node output port 14; For m road, back output channel, connect a tunable wavelength converter 3 behind each passive coupler 6 earlier, and then link to each other with the wavelength division multiplexer 12 of node output port 14.
In every group cache exchanging output port each (W+m) port is received on the corresponding FDL by a wavelength division multiplexer 12, connect a Wave decomposing multiplexer 2 behind the every FDL again and carry out demultiplexing, W+m road signal behind the demultiplexing is respectively through a shunt selected cell 10, every road signal is delivered on the passive coupler 6 of destination node output port 14, be connected to corresponding node output optical fibre 9 by node output port 14 then.Along separate routes selected cell 10 connects one group of parallel semiconductor optical amplifier (SOA) optical gate 8 after by a splitter 7 and forms.Each along separate routes selected cell 10 need N SOA optical gate 8, be used for realizing selecting of N node output port.Optical fiber is all used in connection between above-mentioned each device.
The number of now still supposing the node input/output end port is N, and the number of wavelengths of carrying on every I/O optical fiber is W, and the internal wave long number is m, and the number of sharing the formula fiber delay line is B.If the light grouping is with wavelength X
1Arrive node input port 1, go out this light grouping by the Wave decomposing multiplexer demultiplexing earlier, according to the destination address in the optical packet head portion, this grouping will exchange to node output port N.At this moment, if node output port N medium wavelength λ
1Free time, (node output port N goes up λ then by optical switch matrix light to be packet-switching to the straight-through output port of corresponding exchange
1Pairing port), and then by node output port N directly export.
Node structure of the present invention uses the method that increases the buffer memory number of wavelengths to increase the buffer memory capacity of sharing formula fiber delay line 5.The buffer memory wavelength of sharing in the formula fiber delay line 5 comprises two parts, and a part is the transmission wavelength in the I/O optical fiber, and another part is the extra optical wavelength of introducing, and is called inside wavelength.When FDL competition took place, the light grouping that competition takes place can be cached on the inside wavelength in the same fibre delay line.Therefore, worsen and effectively to be compensated owing to FDL competes caused joint behavior.Thisly be called the inside wavelength method by the method for in fiber delay line 5, using extra buffer memory wavelength to increase FDL light buffer memory capacity.In order to realize the inside wavelength method, the port number in the optical switch matrix 4 in every group cache exchanging output port should be greater than the number of wavelengths in the every I/O optical fiber.
The quantity of SOA optical gate 8 equals the quantity of node output port 13.Each along separate routes a SOA optical gate 8 on selected cell 10 be connected in the node output port 14 on the corresponding passive coupler 6, by the on off state of control SOA optical gate 8, can deliver to destination node output port 14 to signal.
Comprise the multichannel output channel in 14 mouthfuls of each node outputs, the quantity of output channel is internal wave long number sum in transmission wavelength number in the every output optical fibre and the fiber delay line, wherein: each the road output channel that belongs to transmission wavelength is directly connected on the wavelength division multiplexer 12 in the node output port 14, each road output channel that belongs to inside wavelength links to each other with a tunable wavelength converter 3 earlier, and then is connected on the wavelength division multiplexer 12 in the node output port 14.Each node output port 14 links to each other with an output optical fibre 9 by the wavelength division multiplexer 12 in the port.Optical fiber is all used in connection between above mentioned each device.
In node structure of the present invention, light is grouped in the I/O optical fiber and transmits with wave division multiplex mode, so after the light grouping arrives certain input port from input optical fibre, go out each light grouping by Wave decomposing multiplexer 2 demultiplexings earlier.If in the node output port 14, the input light corresponding optical wavelength free time of grouping, then light is packet-switching to the straight-through output port of exchange, and then directly exports by destination node output port 14 by light beginning matrix 4.
If light wavelength lambda among the destination node output port N
1Occupied, the grouping of input light will clash, and then can use this moment following light grouping control algolithm to solve conflict:
(1) if node output port N has idle transmission wavelength, as λ
i(i ∈ 1 ..., W}, i ≠ 1), then can be by tunable wavelength converter corresponding on the node input port 1 the carrying wavelength X of input light grouping
1Be transformed to wavelength X
iThen, (node output port N goes up λ by optical switch matrix light to be packet-switching to the straight-through output port of corresponding exchange
iPairing port), and then by node output port N directly export.
(2) if node output port N does not have idle wavelength, then can be by fiber delay line to light grouping carrying out buffer memory.At this moment, determine employed buffer memory wavelength (λ according to the shortest formation algorithm
i, i ∈ 1 ..., W}) and fiber delay line (FDL k, k ∈ 1 ..., B}).If fiber delay line FDLk goes up the buffer memory wavelength X
iFree time, then the carrying wavelength X of input light being divided into groups by tunable wavelength converter corresponding on the node input port 1
1Be transformed to wavelength X
i, by optical switch matrix light is packet-switching to corresponding cache exchanging output port (buffer memory wavelength X on the fiber delay line FDL k then
iPairing port), carry out buffer memory by FDLk again.Through behind the cache-time of k unit,,, destination node output port N is delivered in the light grouping export by Wave decomposing multiplexer and the shunt selected cell that links to each other with FDL k at the output of FDL k.
(3) if according to the buffer memory wavelength X on the selected fiber delay line FDLk of the shortest formation algorithm
iShared by the grouping of other light, i.e. FDL competition takes place, and then the light grouping can't be cached in the buffer memory wavelength X among the FDLk
iOn.At this moment, can search inside wavelength (λ among the FDLk
k, k ∈ W+1 ..., W+m}) whether arranged the free time.If have, then import light grouping by tunable wavelength converter corresponding on the node input port 1, input light is divided into groups to transform to a certain available inside wavelength (as, λ
n) on.Then, by optical switch matrix light is packet-switching to corresponding cache exchanging output port (inside wavelength λ on the fiber delay line FDL k equally
nPairing port), carry out buffer memory by FDL k again.Through behind the cache-time of k unit,,, destination node output port N is delivered in the light grouping by Wave decomposing multiplexer and the shunt selected cell that links to each other with FDL k at the output of FDL k.Because inside wavelength λ
nNot in the scope of transmission wavelength, so at destination node output port N, also will be by tunable wavelength converter the inside wavelength λ of carrying light grouping
nBe transformed into originally by the selected transmission wavelength λ of the shortest formation algorithm
iExport.(4) if FDL competes when taking place, do not have available inside wavelength among the selected FDL, then importing the light grouping will be dropped.
Claims (3)
1. shared formula optical packet switching node structure based on inside wavelength, comprise Wave decomposing multiplexer (2), tunable wavelength converter (3), optical switch matrix (4), wavelength division multiplexer (12), fiber delay line (5), shunt selected cell (10), semiconductor optical amplifier (SOA) optical gate (8), passive coupler (6) and connect optical fiber, it is characterized in that:
Configuration is shared formula fiber delay line (5) for one group on the cache exchanging output port of described optical switch matrix (4), be used to solve the competition of light grouping, have a plurality of optical wavelength in the every fiber delay line (5) and come the grouping of buffer memory light, each fiber delay line (5) is degeneracy and arranges, promptly, the light grouping of two unit lengths of each wavelength storage in the light grouping of a unit length of each wavelength storage in first fiber delay line, second fiber delay line, the rest may be inferred; Every group cache exchanging output port of described optical switch matrix (4) connects a fiber delay line (5) by a wavelength multiplexer (12), connect a Wave decomposing multiplexer (2) behind the every fiber delay line (5) again and carry out demultiplexing, each road signal behind the demultiplexing is through a shunt selected cell (10), this road signal is delivered on the passive coupler (6) of destination node output port (14), the path that belongs to transmission wavelength is directly linked on the wavelength division multiplexer (12) of node output port, after the path that belongs to inside wavelength then connects a tunable wavelength converter (3), be connected to corresponding node output optical fibre (9) by the wavelength division multiplexer (12) on the node output port (14) again; The buffer memory capacity of sharing formula fiber delay line (5) increases by the quantity that increases the buffer memory wavelength; Port number in the described optical switch matrix (4) in every group cache exchanging output port is greater than the number of wavelengths in the every I/O optical fiber.
2. the shared formula optical packet switching node structure based on inside wavelength according to claim 1, it is characterized in that, described shared formula light Packet Switch Node left side is node input port (13), the switching node right side is node output port (14), the left side of optical switch matrix (4) is the exchange input port, optical switch matrix (4) right side is straight-through output port of exchange and cache exchanging output port, at each node input port (13), every input optical fibre (1) is behind a Wave decomposing multiplexer (2) demultiplexing, each road optical fiber links to each other with a tunable wavelength converter (3) respectively again, and tunable wavelength converter (3) is received the exchange input port of optical switch matrix (4).
3. the shared formula optical packet switching node structure based on inside wavelength according to claim 1, it is characterized in that, described shunt selected cell (10) connects one group of parallel SOA optical gate (8) after by a splitter (7) to be formed, and the quantity of SOA optical gate (8) equals the node number of output ports.
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Cited By (9)
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| CN103401739A (en) * | 2013-08-05 | 2013-11-20 | 东南大学 | Node device for supporting sensing access and light packet transmission |
| WO2015074375A1 (en) * | 2013-11-22 | 2015-05-28 | 华为技术有限公司 | Optical network switching device |
| CN107071594A (en) * | 2017-05-05 | 2017-08-18 | 重庆邮电大学 | Multicast switch node conflict solution with Optical buffer technology is changed based on frequency spectrum |
| US9794657B1 (en) | 2016-06-02 | 2017-10-17 | Huawei Technologies Co., Ltd. | System and method for optical switching |
| CN109451377A (en) * | 2018-11-28 | 2019-03-08 | 杭州电子科技大学 | Optical switch based on integrated form hybrid switching technique |
| CN112040353A (en) * | 2020-09-08 | 2020-12-04 | 东南大学 | Distributed edge computing system based on optical packet switching |
| CN114979844A (en) * | 2022-07-21 | 2022-08-30 | 阿里巴巴（中国）有限公司 | Optical switch and data communication system |
| CN117178216A (en) * | 2021-03-28 | 2023-12-05 | 纽光电有限公司 | Optical switch with all-optical memory buffer |
| CN117178216B (en) * | 2021-03-28 | 2024-04-19 | 纽光电有限公司 | Optical switch with all-optical memory buffer |
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- 2008-09-23 CN CNA2008102002241A patent/CN101370315A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103401739A (en) * | 2013-08-05 | 2013-11-20 | 东南大学 | Node device for supporting sensing access and light packet transmission |
| CN103401739B (en) * | 2013-08-05 | 2016-06-29 | 东南大学 | A kind of node apparatus supporting sensing to access the sensing network with optical packet transferring |
| WO2015074375A1 (en) * | 2013-11-22 | 2015-05-28 | 华为技术有限公司 | Optical network switching device |
| EP3062527A4 (en) * | 2013-11-22 | 2016-10-12 | Huawei Tech Co Ltd | Optical network switching device |
| WO2017206294A1 (en) * | 2016-06-02 | 2017-12-07 | Huawei Technologies Co., Ltd. | System and method for optical switching |
| US9794657B1 (en) | 2016-06-02 | 2017-10-17 | Huawei Technologies Co., Ltd. | System and method for optical switching |
| CN107071594A (en) * | 2017-05-05 | 2017-08-18 | 重庆邮电大学 | Multicast switch node conflict solution with Optical buffer technology is changed based on frequency spectrum |
| CN107071594B (en) * | 2017-05-05 | 2020-03-24 | 重庆邮电大学 | Multicast switching node conflict resolution method based on spectrum conversion and optical cache technology |
| CN109451377A (en) * | 2018-11-28 | 2019-03-08 | 杭州电子科技大学 | Optical switch based on integrated form hybrid switching technique |
| CN109451377B (en) * | 2018-11-28 | 2021-07-27 | 杭州电子科技大学 | Optical switch based on integrated hybrid switching technology |
| CN112040353A (en) * | 2020-09-08 | 2020-12-04 | 东南大学 | Distributed edge computing system based on optical packet switching |
| CN117178216A (en) * | 2021-03-28 | 2023-12-05 | 纽光电有限公司 | Optical switch with all-optical memory buffer |
| CN117178216B (en) * | 2021-03-28 | 2024-04-19 | 纽光电有限公司 | Optical switch with all-optical memory buffer |
| CN114979844A (en) * | 2022-07-21 | 2022-08-30 | 阿里巴巴（中国）有限公司 | Optical switch and data communication system |
| CN114979844B (en) * | 2022-07-21 | 2022-10-21 | 阿里巴巴（中国）有限公司 | Optical switch and data communication system |
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