CN1449134A - Node structure of light transmission network based on adjustable wavelength shifter and wavelength self-router - Google Patents
Node structure of light transmission network based on adjustable wavelength shifter and wavelength self-router Download PDFInfo
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- CN1449134A CN1449134A CN03116460A CN03116460A CN1449134A CN 1449134 A CN1449134 A CN 1449134A CN 03116460 A CN03116460 A CN 03116460A CN 03116460 A CN03116460 A CN 03116460A CN 1449134 A CN1449134 A CN 1449134A
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Abstract
The invention relates to an optical transmitting network node construction based on adjustable wavelength convertors and wavelength routers. The foot terminals of the wavelength routers linked with adjacent nodes are connected with the local foot modules and adjustable wavelength convertors. The local top modules and adjustable wavelength convertors are connected with the top terminals of the wavelength routers. The output terminals of local foot modules and input terminals of local top modules are connected with the local electrical network. The input terminals of router control modules are connected with the local electrical network, and the output terminals of router control modules are connected with the local top router module and the adjustable wavelength convertors respectively. The elimination of optical switch matrix at nodes reduces the exchanging time of nodes, the exchanging efficiency and the transmitting function are improved therefore.
Description
Technical field:
The present invention is a kind of optical transport network node of being made up of from router etc. tunable laser, tunable wavelength converter, photoelectric detector and wavelength, belongs to the photonic system field in the optical communication technique.
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 disposal ability, the good transparency, wavelength routing characteristic, compatibility and extensibility, can become the first-selection of at a high speed of future generation even ultrahigh speed broadband network at the bandwidth demand of long time endoadaptation high speed broadband service.
In present WDM all-optical network, network node is usually by wave multiplexer, channel-splitting filter, optical switch matrix, road module etc. is formed up and down, the network control management is undertaken by the huge network management software of complexity, the whole complicated network structure, the cost costliness, and the node switching time largely be subjected to the node structure device particularly the optical switch switching matrix processing time limit, and the high of the cost that causes of a large amount of uses of road module also is a problem up and down.Because at present the raising of the processing speed of optical switch also needs the time, and the increase gradually of transmission wavelength number and single wavelength channel transmission capacity in every optical fiber, the shortcoming of this node structure is obvious all the more.
In wavelength division multiplexing high-speed transfer network and photon wavelength-division switching system, people such as H.Kobrinski and Hill proposed to adopt wavelength division multiplex device to make interconnected imagination, but this coupled apparatus does not have the function of wavelength from route.One of the present inventor's Ceng Qingji professor proposed and had designed wavelength from router in 1994, this wavelength can provide 4 interconnected abilities of the wavelength configuration more than the wavelength-division channel from router, the optical wavelength signal of an input port can be sent to N port (N 〉=3) by wavelength from route.Use this structure can realize that wavelength from routing function, effectively reduces the number of optical switch matrix, reduce the node switching time, improve node switching efficient.This structure is not applied in the optical transport network node at present as yet.
Summary of the invention:
The objective of the invention is at the deficiencies in the prior art, propose a kind of new light conveying network node structure, avoid a series of problems of bringing because of optical switch matrix, improve the node traffic exchange velocity, increase the node functional reliability.
For realizing such purpose, the present invention proposes a kind of based on tunable wavelength converter and wavelength light conveying network node structure from router, this light conveying network node structure is at the deficiency of the node structure of present optical transfer network, adopt wavelength from router as network node operation exchange core cell, to realize converging of electric layer service photoreactive layer business, node carries out route by fixing wavelength connection and connects, select corresponding wavelength can finish Route Selection during use, realize that wavelength is from routing function.Do not need to use optical switch matrix in the node, effectively reduced the node switching time, improved the exchange efficiency and the network transmission performance of node.
The network node that the present invention proposes is made up of set out on a journey from router, this locality module, this underground road module, tunable wavelength converter, wave multiplexer, channel-splitting filter, routing module control of wavelength.Wavelength from router with link to each other with adjacent node by optical fiber, wavelength links to each other with tunable wavelength converter with this underground road module through channel-splitting filter from the following road port of router, this locality module of setting out on a journey links to each other with the last road port of wavelength from router through wave multiplexer with tunable wavelength converter, the input of the output of this underground road module and the local module of setting out on a journey is connected with the local power grid network, the input of routing module control is connected with the local power grid network, and the output of routing module control connects this locality set out on a journey module and tunable wavelength converter respectively.
The business of routing module control and source node is according to the corresponding wavelength of the different distribution of destination node, the wavelength that arrives intermediate node when the business of different wave length is during from router, its wavelength has determined its route, do not need intermediate node that this business is handled, thereby realized that wavelength is from routing function.In the business of network node up and down aspect the road, in each node structure of the present invention, difference according to the destination node of the different business that enters network, use tunable wavelength converter to carry out route according to the different modes of different wave length of distributing in different business purpose ground, the business that arrives local node then changes road under the signal of telecommunication into by channel-splitting filter and a plurality of photodetector unit.This node adopts tunable wavelength converter to finish professional work of road up and down and the professional forwarding of wavelength, and the service signal of setting out on a journey converges selects according to destination node by tunable wavelength converter that corresponding wavelength is laggard goes into wavelength and arrive destination node from router.
The present invention need not re-use optical switch matrix by using wavelength from router in the optical transfer network node, simplified the network node structure of optical transfer network, a series of problems of having avoided optical switch matrix to bring, improve the speed of node traffic exchange, reduce cost, increase the node functional reliability.
Description of drawings:
The optical transport network node structure that Fig. 1 proposes for the present invention reaches the situation schematic diagram in whole network.
As shown in Figure 1, the node structure that the present invention proposes can be used in the optical transport network of network topology structure arbitrarily, use single according to the network topology relation or the multifiber connection between the node, each node is set Wavelength Assignment and optical fiber connection relation according to the network routing configuration information during connection.Wherein, node structure of the present invention comprises wavelength set out on a journey from router, wave multiplexer, channel-splitting filter, this locality module, this underground road module, tunable wavelength converter and routing module control, finishes different functions respectively.
The wavelength that Fig. 2 proposes for the present invention is from the structure of router node.
As shown in Figure 2, node of the present invention is made up of set out on a journey from router, wave multiplexer, channel-splitting filter, this locality module, this underground road module, tunable wavelength converter and routing module control of wavelength.
Fig. 3 is this locality modular structure schematic diagram of setting out on a journey.
As shown in Figure 3, local business such as SDH/SONET, ATM, IP etc. converge the back by electric layer service interface and produce the wavelength signals of corresponding route according to different destination nodes by tunable wavelength converter, are sent to destination node through the laggard people's wavelength of ovennodulation from router then.
Fig. 4 is this underground road modular structure schematic diagram.
As shown in Figure 4, after the light signal of source node arrived this locality, the process wavelength entered behind router and is divided into several single wavelength signals in the channel-splitting filter, converts the signal of telecommunication to through photodetector unit respectively, sends in the local power grid network through after the processing and amplifying.
Embodiment:
The network node of the embodiment of the invention is made up of set out on a journey from router, this locality module, this underground road module, tunable wavelength converter, channel-splitting filter, wave multiplexer, routing module control of wavelength, as shown in Figure 2.Wavelength from router with link to each other with adjacent node by optical fiber, wavelength links to each other with tunable wavelength converter with this underground road module through channel-splitting filter from the following road port of router, this locality module of setting out on a journey links to each other with the last road port of wavelength from router through wave multiplexer with tunable wavelength converter, the input of the output of this underground road module and the local module of setting out on a journey is connected with the local power grid network, the input of routing module control is connected with the local power grid network, and the output of routing module control connects this locality set out on a journey module and tunable wavelength converter respectively.
Below use the network of 4 wavelength to be example, the embodiment of technical solution of the present invention is described by one 5 node.The annexation of each node of network is expressed in matrix as { (0,1,1,0,1) (1,0,0,1,0) (1,0,0,1,1) (0,1,1,0,0) (1,0,1, O, 0) }.During networking, according to the routing relation between each node of network the wavelength available of network is planned at first that identical wavelength can use on disjoint circuit in network, network can be arranged the use of wavelength flexibly.Table 1 is depicted as the Wavelength Assignment scheme between wherein a kind of available network node.
Wavelength Assignment routing table between table 1 network node
Annotate: "-" expression in the table does not have professional; Bracket inner digital is represented the path.
| Node 1 | Node 2 | Node 3 | Node 4 | Node 5 | |
| Node 1 | ?????- | ????λ1 | ????λ2 | ?????- | ????λ4 |
| Node 2 | ????λ1 | ?????- | ?????- | ????λ2 | ????λ3(2-1-5) |
| Node 3 | ????λ2 | ?????- | ?????- | ????λ4 | ????λ1 |
| Node 4 | ????λ3(4-3-1) | ????λ2 | ????λ4 | ?????- | ?????- |
| Node 5 | ????λ4 | ????λ3(5-1-2) | ????λ1 | ?????- | ?????- |
During use, network and node structure shown in accompanying drawing 1,2, local service is sent into this locality module of setting out on a journey by local power grid network node, and corresponding routing iinformation sent to routing module control, routing module control selects suitable wavelengths to give this business according to the wavelength configuration in the table 1, is converted business to corresponding light signal and is sent into network by wave multiplexer by this locality module of setting out on a journey then.When the business in the network arriving when local, determine whether on this underground road according to its wavelength, if road down converts light signal to the signal of telecommunication by this underground road module and sends in the local power grid network.
The protection of networking and recovery policy adopt the route stand-by scheme; can be that the optical fiber open circuit conditions designs different routing plans respectively according to various heterogeneous networks faults; and be optimized; form a tactic network routing table according to optimizing the result, place each network node routing module control.When the optical fiber of certain two node or multi-point in the network breaks down, the routing table of requester network routing module control, select alternate routing to make through the wavelength channel of fault fiber segment and use standby wavelength routing plan arrival destination node instead, this scheme may use a plurality of wavelength to arrive behind multi-hop.In this example, suppose that the optical fiber between node 1 and the node 5 breaks down, at this moment, can provide a alternate routing table as shown in table 2, the route Wavelength Assignment of substitution list 1 makes network continue reliable normal work.
The alternate routing table of fault between table 2 node 1 and 5
Annotate: "-" expression in the table does not have professional; Bracket inner digital is represented the path.A plurality of wavelength are represented the situation that multi-hop connects
| Node 1 | Node 2 | Node 3 | Node 4 | Node 5 | |
| Node 1 | ????λ1 | ???λ2 | ????- | λ4(1-3) λ1(3-5) | |
| Node 2 | ????λ1 | ????- | ???- | ????λ2 | λ3(2-1) λ4(1-3) λ1(3-5) |
| Node 3 | ????λ2 | ????- | ???- | ????λ4 | ????λ1 |
| Node 4 | λ3(4-3 ????-1) | ????λ2 | ???λ4 | ????- | ????- |
| Node 5 | λ1(5-3) λ4(3-1) | ??λ1(5-3) ??λ4(3-1) ??λ3(1-2) | ???λ1 | ????- | ????- |
Claims (1)
1, a kind of based on tunable wavelength converter and wavelength light conveying network node structure from router, it is characterized in that by wavelength from router, this locality module of setting out on a journey, this underground road module, tunable wavelength converter, wave multiplexer, channel-splitting filter, routing module control is formed, wavelength from router with link to each other with adjacent node by optical fiber, wavelength links to each other with tunable wavelength converter with this underground road module through channel-splitting filter from the following road port of router, this locality module of setting out on a journey links to each other with the last road port of wavelength from router through wave multiplexer with tunable wavelength converter, the input of the output of this underground road module and the local module of setting out on a journey is connected with the local power grid network, the input of routing module control is connected with the local power grid network, and the output of routing module control connects this locality set out on a journey module and tunable wavelength converter respectively.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031164609A CN1207856C (en) | 2003-04-17 | 2003-04-17 | Node structure of light transmission network based on adjustable wavelength shifter and wavelength self-router |
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| CNB031164609A CN1207856C (en) | 2003-04-17 | 2003-04-17 | Node structure of light transmission network based on adjustable wavelength shifter and wavelength self-router |
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| Publication Number | Publication Date |
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| CN1449134A true CN1449134A (en) | 2003-10-15 |
| CN1207856C CN1207856C (en) | 2005-06-22 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1832383B (en) * | 2005-03-09 | 2010-04-28 | 华为技术有限公司 | Service signal node cross dispatching method and node cross device |
| CN101909008A (en) * | 2010-08-02 | 2010-12-08 | 清华大学 | Method for simulating wavelength routing optical network |
| CN103036812A (en) * | 2012-12-20 | 2013-04-10 | 中国联合网络通信集团有限公司 | Wavelength resource reservation method and optical network node |
-
2003
- 2003-04-17 CN CNB031164609A patent/CN1207856C/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1832383B (en) * | 2005-03-09 | 2010-04-28 | 华为技术有限公司 | Service signal node cross dispatching method and node cross device |
| CN101909008A (en) * | 2010-08-02 | 2010-12-08 | 清华大学 | Method for simulating wavelength routing optical network |
| CN103036812A (en) * | 2012-12-20 | 2013-04-10 | 中国联合网络通信集团有限公司 | Wavelength resource reservation method and optical network node |
| CN103036812B (en) * | 2012-12-20 | 2016-02-03 | 中国联合网络通信集团有限公司 | Wavelength resource reservation method and optical network node |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1207856C (en) | 2005-06-22 |
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