CN1434310A - Optical packet-switched networks node structure based on adjustable laser - Google Patents
Optical packet-switched networks node structure based on adjustable laser Download PDFInfo
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- CN1434310A CN1434310A CN03115473A CN03115473A CN1434310A CN 1434310 A CN1434310 A CN 1434310A CN 03115473 A CN03115473 A CN 03115473A CN 03115473 A CN03115473 A CN 03115473A CN 1434310 A CN1434310 A CN 1434310A
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Abstract
The invention is a node structure of optical packet-switched network, based on adjustable laser. The node input fibre-optical is divided into multiple paths by the wave-division device and then respectively links with an adjustable wavelength converter, the output end of each converter linked with the different-length fibre-optical delayed line by one wave-division device, that of each group of delayed lines linked with the optical switch array by a wave-combing apparatus and an adjustable wavelength converter and that of the array linked with the waving-combing device whose number is same to the node input end, so as to output the optical signal to the aim node. It adopts the converter to realize the path selection and transmission of the optical package and multiple wave-combing and wave-division devices to select the delayed line.
Description
Technical field:
The present invention relates to a kind of light packet network node structure, be applicable in the light packet network, belong to the photonic system field in the optical communication technique based on tunable laser.
Background technology:
Along with the development of society and the progress of science and technology, the social demand of emerging broadband data services such as wideband video, multimedia service, IP-based business in real time/quasi real time constantly increases.The high speed full optical communication network has become the development trend of communication network.In numerous network technology implementations, based on the all-optical network scheme of optical fibre wavelength-division multiplex (WDM) can provide at a high speed, jumbo transmission and processing power, the good transparency, wavelength routing characteristic, compatibility and extensibility, can become the first-selection of at a high speed of future generation even hypervelocity broadband network at the bandwidth demand of long time endoadaptation high speed broadband service.
At present, exchange on optical fiber cross connection (OXC) and Optical Add/Drop Multiplexer (OADM) is based on the light exchange of wavelength, operational exchange is finished by the electric router of lower floor, exchange rate is subjected to the restriction of core router backboard speed and quantity, and the cost height of complex structure, equipment becomes electronic bottleneck.In order to solve electronic bottleneck restricted problem, realize full light exchange, in the light exchange, introduced the light packet technology in recent years.The introducing of light packet switch is counted as the competition with electric grouping system, and the light packet switch has adapted to the requirement that bandwidth demand increases.Optical packet network can provide unified technology on the basis of WDM, support backbone switch and the router and the interconnected link of high flow capacity, has the technical indicator of the most critical of optical-fiber networks of new generation such as scalable and dirigibility.
At present had a lot of people to propose the structure of light packet network node, these network node structures are made up of wave multiplexer, channel-splitting filter, optical switch matrix, fiber delay line etc. usually.The gordian technique of light packet network node is to reduce the light loss rate, reduces the blocking probability of network node, just to the solution of race problem.Because light storage device also is in conceptual phase, the method for solution competition commonly used mainly is to use fiber delay line, on practical solution, uses the complex structure of the light packet network node of fiber delay line formation at present, and the scale of special optical switch matrix is big.The management and dispatching difficulty is big.
Summary of the invention:
The objective of the invention is at the deficiencies in the prior art, propose a kind of light packet network node structure, reduce the scale of optical switch matrix, reduce light packet network node administration scheduling difficulty based on tunable laser, reduce network blocking probability and light loss rate, improve network performance.
For realizing such purpose, the present invention has adopted a plurality of wave multiplexers, channel-splitting filter, tunable wavelength converter, optical switch matrix, fiber delay line at the light Packet Switching Node.
The node input optical fibre is by the channel-splitting filter demultiplexing, every road optical fiber connects a tunable wavelength converter, each wavelength shifter output terminal links to each other with the fiber delay line of different length by a channel-splitting filter, these fiber delay lines are further divided into array, the output terminal of every group of fiber delay line connects a wave multiplexer again, each wave multiplexer output terminal respectively connects a tunable wavelength converter, the output terminal of tunable wavelength converter is connected with optical switch matrix, and the optical switch matrix output terminal connects and the wave multiplexer of node input end similar number outputs to destination node with light signal.All connect between each device above-mentioned by optical fiber.The input wavelength of each input port uses one group of independent fiber delay line.
After the light bag arrives input port, select corresponding output port according to the destination node of light bag, determine port status, if this output port free time is not used fiber delay line, select corresponding wavelength, the light bag is directly exported by node; If this output port is occupied, then consider to use fiber delay line with this light bag buffer memory.After delay line is used in decision, check the state of all fiber delay lines earlier, determine to arrive in each delay line the time of the light bag of corresponding output port, determine the operable period of this light bag, check each bar fiber delay time line states of this input port pairing then, find the operable delay line that meets the requirements, by tunable wavelength converter with this light packet transform to entering delay line by the respective wavelength of wavelength divided device.The output of the delay line corresponding with each input port can effectively solve the race problem between the same input port by several optical multiplexer outputs.If the delay line that does not meet the demands then abandons this light bag.From the light bag of delay line output again by behind the tunable wavelength converter wavelength conversion of light bag being exported by optical switch matrix after satisfying the wavelength that the node output port requires.
The present invention uses the Fast Adjustable laser instrument to constitute tunable wavelength converter, realizes the routing and the forwarding of light bag, and a plurality of wavelength wave multiplexers, channel-splitting filter carry out the fiber delay time line options, have good effect.The present invention uses a plurality of tunable wavelength converters and optical multiplexer and channel-splitting filter and fiber delay line to make up, and the port race problem has been done one effectively solved.This scenario-frame is simple and clear, and is powerful, can reduce the scale of optical switch matrix simultaneously with realizing that competition solves and the light packet routing function organically combine, and reduces and avoids the adverse effect of optical switch matrix to joint behavior.
The light packet network node structure that the present invention proposes is used by optical fiber interconnected, can constitute 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, metropolitan area optical network and the Optical Access Network.
Description of drawings:
Fig. 1 is the light packet network node structure synoptic diagram that the present invention relates to.
As shown in Figure 1, the present invention has adopted a plurality of wave multiplexers, channel-splitting filter, tunable wavelength converter, optical switch matrix and fiber delay line at the light Packet Switching Node.The node input optical fibre respectively connects a tunable wavelength converter after by the channel-splitting filter demultiplexing, each wavelength shifter output terminal links to each other with the fiber delay line of different length by a channel-splitting filter, each is connected the output terminal of every group of fiber delay line with optical switch matrix through a wave multiplexer, a tunable wavelength converter, and the optical switch matrix output terminal connects and the wave multiplexer of node input end similar number outputs to destination node with light signal.All connect between each device by optical fiber.
Embodiment:
Technical scheme for a better understanding of the present invention is further described embodiment below in conjunction with accompanying drawing.
As shown in Figure 1, the present invention has adopted a plurality of wave multiplexers, channel-splitting filter, tunable wavelength converter, optical switch matrix, fiber delay line at the light Packet Switching Node.The node input optical fibre by the channel-splitting filter demultiplexing after every road optical fiber connect a tunable wavelength converter, each wavelength shifter output terminal connects a channel-splitting filter, link to each other with the fiber delay line of different length, these fiber delay lines are further divided into array, every group output terminal connects a wave multiplexer again, each wave multiplexer output terminal respectively connects a tunable wavelength converter, the output terminal of wavelength shifter is connected with optical switch matrix then, and the optical switch matrix output terminal connects and the wave multiplexer of node input end similar number outputs to destination node with light signal.All connect between each device above-mentioned by optical fiber.
Each input wavelength is successively finished the selection of delay line by a wavelength shifter between two channel-splitting filters and two channel-splitting filters, the corresponding one group of fiber delay line of each input port, export by several optical multiplexers during every group of delay line output, to solve the race problem between the same input port delay line.The optical multiplexer output terminal connects a tunable wavelength converter and optical switch matrix, and the light bag of output is realized that routing function is sent to corresponding output port output.
Light packet network node with 2 optical fiber is an example, i.e. M=2 in the accompanying drawing, and every optical fiber uses 8 wavelength, i.e. N=8, number of wavelengths is from λ 1 to λ 8.8 road wavelength of the single input optical fibre of network node respectively connect a tunable wavelength converter on each wavelength path after by channel-splitting filter, and each wavelength shifter output terminal connects a channel-splitting filter, are respectively GL (G=1 wherein, 2,3 with length ... 8; L is the base unit 8 of a delay line length) fiber delay line link to each other, these fiber delay lines are further divided into the K=3 group, the delay line number is respectively 2,3,3, every group output terminal connects a wave multiplexer again, each wave multiplexer output terminal respectively connects a tunable wavelength converter, the output terminal of wavelength shifter and a T*T (T=K*M*8 then, M=2 in the present embodiment, so K=3 is T=48) optical switch matrix connect, the wave multiplexer that the optical switch matrix output terminal connects with node input end similar number outputs to destination node with light signal.All connect between each device above-mentioned by optical fiber.The input wavelength of each input port uses one group of independent fiber delay line.After the light bag arrives input port, select corresponding output port according to the destination node of light bag, determine port status, if this output port free time is not used fiber delay line, select corresponding wavelength, the light bag is directly exported by node; If this output port is occupied, then consider to use fiber delay line with this light bag buffer memory.After delay line is used in decision, check the state of all fiber delay lines earlier, determine to arrive in each delay line the time of the light bag of corresponding output port, determine the operable period of this light bag, check each bar fiber delay time line states of this input port pairing then, find the operable delay line that meets the requirements, by tunable wavelength converter with this light packet transform to entering delay line by the respective wavelength of wavelength divided device.The output of the delay line corresponding with each input port can effectively solve the race problem between the same input port by several optical multiplexer outputs.If the delay line that does not meet the demands then abandons this light bag.From the light bag of delay line output again by behind the tunable wavelength converter wavelength conversion of light bag being exported by optical switch matrix after satisfying the wavelength that the node output port requires.
Claims (1)
1, a kind of light packet network node structure based on tunable laser, it is characterized in that respectively connecting a tunable wavelength converter after the node input optical fibre is by the channel-splitting filter demultiplexing, each wavelength shifter output terminal links to each other with the fiber delay line of different length by a channel-splitting filter, each is connected the output terminal of every group of fiber delay line with optical switch matrix through a wave multiplexer, a tunable wavelength converter, and the optical switch matrix output terminal connects and the wave multiplexer of node input end similar number outputs to destination node with light signal.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031154735A CN1206825C (en) | 2003-02-20 | 2003-02-20 | Optical packet-switched networks node structure based on adjustable laser |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB031154735A CN1206825C (en) | 2003-02-20 | 2003-02-20 | Optical packet-switched networks node structure based on adjustable laser |
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| CN1434310A true CN1434310A (en) | 2003-08-06 |
| CN1206825C CN1206825C (en) | 2005-06-15 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101466053B (en) * | 2009-01-13 | 2011-11-30 | 中兴通讯股份有限公司 | Apparatus and method for implementing optical network node |
| CN105282632A (en) * | 2015-11-16 | 2016-01-27 | 无锡路通视信网络股份有限公司 | Optical mixer, up link for DOCSIS3.0 or higher system, and method for eliminating optical beat interference of the up link |
-
2003
- 2003-02-20 CN CNB031154735A patent/CN1206825C/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101466053B (en) * | 2009-01-13 | 2011-11-30 | 中兴通讯股份有限公司 | Apparatus and method for implementing optical network node |
| CN105282632A (en) * | 2015-11-16 | 2016-01-27 | 无锡路通视信网络股份有限公司 | Optical mixer, up link for DOCSIS3.0 or higher system, and method for eliminating optical beat interference of the up link |
| CN105282632B (en) * | 2015-11-16 | 2019-05-07 | 无锡路通视信网络股份有限公司 | Optical mixer, DOCSIS3.0 system above uplink and eliminate its optical beat interference method |
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| Publication number | Publication date |
|---|---|
| CN1206825C (en) | 2005-06-15 |
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