CN100546235C - Improve device, system and the method thereof of optical communications wavelength utilance - Google Patents
Improve device, system and the method thereof of optical communications wavelength utilance Download PDFInfo
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- CN100546235C CN100546235C CNB2003101219022A CN200310121902A CN100546235C CN 100546235 C CN100546235 C CN 100546235C CN B2003101219022 A CNB2003101219022 A CN B2003101219022A CN 200310121902 A CN200310121902 A CN 200310121902A CN 100546235 C CN100546235 C CN 100546235C
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Abstract
The present invention relates to dense wavelength division multiplexing system, a kind of device, system and method thereof that improves the optical communications wavelength utilance disclosed, make the wavelength utilance when intercoming mutually in twos between a plurality of nodes in the dense wavelength division multiplexing system be improved, signal quality is improved, and OTU quantity is reduced.This multiple spot optical communication network comprises at least 3 Optical Add Drop Multiplexer nodes connected in series successively; The Optical Add Drop Multiplexer node is used to insert the business from previous node, is road under the business of this node with the destination, is not the professional of this node with the destination and mixes and be sent to next node from the new business that inserts of this node.
Description
Technical field
The present invention relates to dense wavelength division multiplexing system, the system that particularly can improve the light transmitting element of wavelength utilance in the dense wavelength division multiplexing system and use this light transmitting element to set up.
Background technology
Dense wave division multipurpose (Dense Wave Division Multiplexing, be called for short " DWDM ") by in an optical fiber, transmitting the more approaching wavelength of a plurality of wavelength ratio, thereby improve the utilance of simple optical fiber, expanded the bandwidth of original optical fiber communication greatly.Usually the channel separation of DWDM is less than 1nm, and current DWDM commonly used in the optical communication network is mostly in the wave band of 1530nm～1565nm, tells 32 or more wavelength.Common dwdm system all is to communicate by letter end to end, as shown in Figure 1.Generally the signal wavelength that receives from client's side apparatus does not meet the standard wave length of dwdm system, therefore need carry out wavelength Conversion, and light transmitting element (Optical Transponder Unit is called for short " OTU ") is promptly finished the function of wavelength Conversion.OTU is nonstandard wavelength Conversion the standard wave length, so that exchange and transmission in whole net, and under the situation of optical signal deterioration, carry out regeneration function.All light signals to be sent of transmitting terminal A close ripple by wave multiplexer and send, light signal is by image intensifer (the Optical Amplifier of intermediate transmission path, be called for short " OA ") amplify the back by receiving terminal B reception, the light signal that receiving terminal B is received passes through the channel-splitting filter partial wave to corresponding OTU.This communication mode is equivalent to for the communication between A and the B two places provides a plurality of tunnels, thereby reaches the purpose of spread communication system bandwidth.
DWDM networking has end to end only solved the communication bandwidth between two points, but usually is a plurality of nodes need mutual communication between any two in the practical application, for example logic connection diagram such as Fig. 2 of three node mutual communication.Existing technology normally utilizes Optical Add Drop Multiplexer (Optical Add DropMultiplexer is called for short " OADM ") to form the network of chain or annular, with the benefit of utilizing the DWDM technology to bring, solves the bandwidth problem between the multi-point.Utilize OADM can insert or take out other wavelength channel at the intermediate node of an optical transport network.Present most producer has developed fixed OADM, and it must be set in advance for the wavelength channel that will insert or take out, and also has another kind to be called the OADM that can set arbitrarily, can do assignment arbitrarily for the wavelength channel that will insert or take out by external command.The most frequently used a kind of OADM structure is back-to-back syndeton, will contain multi-channel light signal by optical demultiplexer and be divided into each wavelength branch road, passes through optical cross-matrix then.In this structure, to use and demodulation multiplexer owing to introduced recovery, loss is bigger, must compensate with the exterior light amplifier sometimes, otherwise a through connect signal is through several times loading and unloading, seriously deterioration.The professional connection diagram of existing OADM such as Fig. 3.Recurrent network such as Fig. 4 of utilizing OADM to form, loop network such as Fig. 5.Wherein, need pair of O TU to be responsible for producing and receiving the light signal of certain wavelength between two of mutual communication nodes between two nodes, to connect.If all there is connection in the node in twos of n node, the OTU number that then needs is n* (n-1).
Though can solve communication issue in twos between the multiple spot by OADM chain or annular networking mode, and a lot of system equipment suppliers can both provide the OTU that can insert a plurality of business simultaneously now, with the business of a plurality of speed of existing between satisfying at 2, and do not need extra convergence device.But no matter under which kind of situation, under the present DWDM networking model, each wavelength channel loaded service all is end to end, and promptly the business that inserts of each OTU is all set out on a journey at a node, all descends the road at another node.What practical communication demand between the maximum bandwidth no matter this wavelength channel can carry and 2 is, as long as need to connect between 2, just needs to distribute wavelength.
In actual applications, the communication bandwidth requirements between the difference often is not an equiblibrium mass distribution.Intercoming mutually as Fig. 4 or a plurality of nodes shown in Figure 5, with node A, B, C is the example discussion, the communication bandwidth that needs 10G between node A and the Node B, and need the communication bandwidth of 2.5G between Node B and the node C, even between node A and the node C as long as the communication bandwidth of 155M, but under the present OADM networking mode between node A and the Node B, between node A and the node C, all be to distribute a wavelength between Node B and the node C.This Wavelength Assignment is utilized method, does not often make full use of the bandwidth that each wavelength channel can carry, and makes that the wavelength utilization ratio of whole system is lower.
Prior art normally connects (Data Cross Connect by some data cross are set at each website to this way to solve the problem, abbreviation " DXC ") equipment, add drop multiplex (Add DropMultiplexer, be called for short " ADM ") equipment or other similar devices, transmit after the business between some differences integrated again.Still with above-mentioned A, B, three node intercommunications of C are that example describes, communication between node A and the node C can directly not distribute wavelength between node A and node C, the flow of node A to the service traffics of node C and node A to Node B mixed be sent to Node B but node A increases a convergence device, the DXC that the Node B website is provided with, ADM or miscellaneous equipment will be earlier be separated the business of node A to Node B and node A to node C, node A is arrived this locality to the professional road of directly descending of Node B, the professional service combining that directly with Node B arrive node C of node A, utilize Node B to transmit afterwards again to the wavelength of node C to node C.Though this mode can improve the wavelength utilization ratio, need extra some equipment that increase at node A, B and C, this will make the investment construction cost increase.Secondly, because the communication bandwidth between these nodes of A, B and C belongs to oarse-grained service dispatching for equipment such as present DXC, ADM, can take the intersection resource of the preciousness of DXC, ADM, therefore reduction system running efficiency be not used widely at present.
In actual applications, there is following problem in such scheme: the wavelength utilance of communicating by letter between the multiple spot in the existing dwdm system is low, do not make full use of the bandwidth that each wavelength can carry, particularly when the low rate connection occupied bigger proportion, the wavelength utilization ratio of whole system was lower; OADM is bigger to the loss of light signal, and signal transmission quality has much room for improvement; And the use amount of OTU is bigger, the system cost height.
Cause the main cause of this situation to be, in the existing dwdm system, no matter the service needed bandwidth is much end to end, also no matter the communication bandwidth of each wavelength is much, each wavelength institute loaded service all is end to end, therefore can not make full use of the bandwidth of each wavelength; Common OADM is bigger to the loss ratio of light signal, causes signal transmission quality to descend; Each is communicated by letter end to end all needs pair of O TU, and when nodes in communication number rising in twos, needed OTU increases with the square-law of node number, so the OTU use amount that multinode is communicated by letter in twos is bigger.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of device, system and method thereof that improves the optical communications wavelength utilance, make the wavelength utilance when intercoming mutually in twos between a plurality of nodes in the dense wavelength division multiplexing system be improved, signal quality is improved, and OTU quantity is reduced.
In order to solve the problems of the technologies described above, the invention provides the light transmitting element in a kind of dense wavelength division multiplexing system, comprise first and second photoelectric conversion modules, scheduling unit, first and second electrooptic conversion modules, the first and second adaptation unit modules; Wherein
Described first and second photoelectric conversion modules are respectively applied for and will be converted to the signal of telecommunication from line side and local light signal of setting out on a journey;
Described scheduling unit is used for and will need outputs to described first adaptation unit at the signal on this underground road from the signal of described first photoelectric conversion module, will from the signal of the described second adaptation unit module with after the signal on this underground road merges, do not output to described second electrooptic conversion module from described first photoelectric conversion module;
The described first and second adaptation unit modules are respectively applied for and encapsulate with decapsulation the signal from described scheduling unit and described second photoelectric conversion module adaptive;
It is light signal that described first and second electrooptic conversion modules are respectively applied for the electrical signal conversion from described first adaptation unit module and described scheduling unit, and outputs to this locality and line side respectively.
Wherein, described scheduling unit comprises the crosspoint module;
Described crosspoint module is used for the signal of buffer memory from described first photoelectric conversion module, according to the destination address that is buffered signal select that this signal outputed to local described first adaptation unit or merge with signal from the described second adaptation unit module after output to described second electrooptic conversion module.
Perhaps, described scheduling unit comprises multiplexer module reconciliation multiplexer module;
It is parallel signal on a plurality of signalling channels that described demodulation multiplexer module is used for the one-channel signal demultiplexing from described first photoelectric conversion module, wherein the part signal passage is connected with described first adaptation unit, being used to transmit need be at the signal on this underground road, other signalling channels connect with described multiplexer module, and being used to transmit need be at the signal on this underground road;
Described multiplexer module is used for and will merges into one the tunnel from the multi-path parallel signal of described demodulation multiplexer module and described second adaptation unit, outputs to described second electrooptic conversion module.
Perhaps, described scheduling unit comprises multiplexer module, demodulation multiplexer module and crosspoint module;
It is multi-path parallel signal that described demodulation multiplexer module is used for the signal of telecommunication demultiplexing from described first photoelectric conversion module;
Described multiplexer module is used for and will merges into one the tunnel from the multi-path parallel signal of described crosspoint module;
Described crosspoint module be used for from described demodulation multiplexer module need output to described first adaptation unit at the signal on this underground road, will from the signal of the described second adaptation unit module with after the signal on this underground road merges, do not output to described multiplexer module from described demodulation multiplexer module.
The present invention also provides the node of the Optical Add Drop Multiplexer in a kind of dense wavelength division multiplexing system, comprises: first channel-splitting filter, first wave multiplexer and the first smooth transmitting element;
Described first channel-splitting filter is used for the multi-wavelength channel separation that will receive;
Described first wave multiplexer is used for the multi-wavelength passage of input is closed ripple and transmission;
The described first smooth transmitting element is used for discerning processing and demultiplexing into a plurality of low-speed parallel signals from the signal of an output port receiving lines side of described first channel-splitting filter, it with the destination road and export under the low speed signal of this node from client side port, with the destination is not that client's service signal that the low speed signal of this node and client side port insert mixes, and finishes an input port that outputs to described first wave multiplexer after the wavelength Conversion;
The output port that described first channel-splitting filter does not connect the described first smooth transmitting element is connected with the input port of described first wave multiplexer.
Wherein, also comprise second channel-splitting filter, second wave multiplexer and first, second tradition first smooth transmitting element;
The described traditional first smooth transmitting element is used to finish the wavelength Conversion function;
The line side input of described first tradition, the first smooth transmitting element and an output port of described first channel-splitting filter are connected, and an input port of line side output and described second wave multiplexer is connected; The line side input of described second tradition, the first smooth transmitting element and an output port of described second channel-splitting filter are connected, and an input port of line side output and described first wave multiplexer is connected;
The output port that described second channel-splitting filter does not connect described traditional first smooth transmitting element is connected with the input port of described second wave multiplexer.
In addition, also comprise second channel-splitting filter, second wave multiplexer and the second smooth transmitting element;
The described second smooth transmitting element is used for discerning processing and demultiplexing from the signal of an output port receiving lines side of described second channel-splitting filter, it with the destination road and export under the signal of this node from client side port, with the destination is not that client's service signal that the signal of this node and client side port insert mixes, and finishes an input port that outputs to described second wave multiplexer after the wavelength Conversion;
The client side port of the described first smooth transmitting element is connected by logical circuit with the client side port of the described second smooth transmitting element;
The output port that described second channel-splitting filter does not connect the described second smooth transmitting element is connected with the input port of described second wave multiplexer.
The present invention also provides the optical communication network of the multiple spot in a kind of dense wavelength division multiplexing system, comprises at least 3 Optical Add Drop Multiplexer nodes connected in series successively;
Described node is used to insert the business from previous described node, is road under the low speed business of this node with the destination, is not that the low speed of this node is professional and mix and be sent to next described node from the new business that inserts of this node with the destination.
Wherein, described Optical Add Drop Multiplexer node connects into annular or chain.
The present invention also provides the processing method of the optical interface in a kind of dense wavelength division multiplexing system, comprises following steps:
Reception is from the business of the previous node in line side;
With the destination is road under the local low speed business;
With the destination is not that local low speed business professional and the new access from this locality is mixed, and carries out wavelength Conversion and is sent to next described node by the line side.
By relatively finding, technical scheme difference with the prior art of the present invention is, the present invention connects connecting the business that has been modified on OTU client's side in the business of creating on the OADM originally, with the communication service of same node between a plurality of different nodes, converge and enter among the same OTU, finish service access and wavelength Conversion function simultaneously, and with the OTU unit of a plurality of different nodes, become ring to realize the communication in twos of multinode in the dwdm system by serial connection light mouth, and the OTU of intermediate node is not equivalent to relaying No. one time to having directly to produce the node signal that is connected with it.
Difference on this technical scheme has brought comparatively significantly beneficial effect.At first, by the system that in dense wavelength division multiplexing system, improves the wavelength utilance that adopts the present invention to propose, can improve the wavelength utilization ratio of system effectively, especially when the low rate connection occupies bigger proportion; Secondly, adopt native system the quantity of OTU in n the node that connects in twos can be reduced to n by n* (n-1), thereby the OTU module number in the reduction system greatly reduce system cost; The 3rd, when between all tandem node not being all exists under the situation about connecting completely between any two, the OTU of intermediate node is not to directly producing the relaying that is equivalent to No. a time that is connected with it, regeneration by light signal can effectively reduce the light signal deterioration problem that faces in the middle of the long Distance Transmission, thereby improves system's optical signal quality.
Description of drawings
Fig. 1 is DWDM communication system schematic diagram end to end;
Fig. 2 is the logic connection diagram of three node mutual communication;
Fig. 3 is the professional connection diagram of existing OADM;
Fig. 4 is the existing recurrent network schematic diagram that utilizes OADM to form;
Fig. 5 is the existing loop network schematic diagram that utilizes OADM to form;
Fig. 6 finishes the schematic diagram of the OTU module of professional up and down and wavelength Conversion function for according to a preferred embodiment according to the present invention the time;
Fig. 7 finishes the inside composition schematic diagram of the OTU module of professional up and down and wavelength Conversion function for according to a preferred embodiment according to the present invention the time;
Fig. 8 is the inner connection diagram of the one-way transmission OADM of a preferred embodiment of the present invention;
Fig. 9 is the inner connection diagram of OADM of traditional OTU of a preferred embodiment of the present invention and the OTU mixing formation that the present invention proposes;
Figure 10 is the inner connection diagram of two-way OADM that constitutes with the OTU that the present invention proposes;
Figure 11 is the logic connection diagram that improves the system of wavelength utilance in dense wavelength division multiplexing system according to a preferred embodiment of the present invention.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with accompanying drawing.
The present invention is by arriving same node the communication service between a plurality of different nodes, converge and enter in the same OTU unit, finish service access and wavelength Conversion function simultaneously, and the OTU unit of a plurality of different nodes, by serial connection light mouth Cheng Huan, can effectively avoid low rate traffic between a plurality of nodes to connect the reduction of the wavelength utilance of the system that is caused.The present invention promptly connects connecting the business that has been modified on OTU unit client's side in the business of creating on the OADM originally in fact, connects thereby need not also will to distribute wavelength for low rate traffic, has saved wavelength, has improved the utilization ratio of wavelength.
A preferred embodiment below in conjunction with this programme illustrates this programme.Schematic diagram such as Fig. 6 that finishes the OTU module of professional up and down and wavelength Conversion function simultaneously of the present invention.
Wherein, the C1 that is connected with OTU module 10 represents n the business that this node inserts respectively to Cn, n can be 1 also can be greater than 1, these professional destinations may be same nodes, also may be different nodes, the wavelength of λ 1 expression OTU module 10 line sides output, the wavelength that λ 2 receives for OTU module 10 line sides, λ 1 can be identical wavelength with λ 2, also can be different wave length.The client signal bandwidth that OTU module 10 inserts can be carried bandwidth less than delivery outlet.Wherein, the carrying bandwidth of delivery outlet is given by system parameters.Client's side that described OTU module 10 is inserted or line-side signal can be SDH (Synchronous Digital Hierarchy) (Synchronous Optical Network, abbreviation " SDH "), Synchronous Optical Network (Synchronous Optical Network, abbreviation " SONET "), asynchronous transfer mode (Asynchronous Transfer Mode, abbreviation " ATM "), the signal of gigabit Ethernet types such as (GigabitEthernet are called for short " GE ").
The inside of OTU module 10 is formed as shown in Figure 7.
It is light signal that electrooptic conversion module 14 and electrooptic conversion module 18 are responsible for electrical signal conversion.Wherein, electrooptic conversion module 14 is responsible for the conversion of the line side signal of telecommunication of OTU module 10 outputs, and electrooptic conversion module 18 is responsible for the conversion of the signal of telecommunication of OTU module 10 place client's sides.
It is adaptive that adaptation unit module 16 and adaptation unit module 17 are responsible for the encapsulation and the decapsulation of input/output signal of client's side respectively.Wherein encapsulated information can be determined by actual conditions, for example, in a preferred embodiment of the present invention, can encapsulate destination information.
In OTU module 10, the light signal that circuit comes becomes the signal of telecommunication behind photoelectric conversion module 11, the signal of telecommunication becomes a plurality of low-speed parallel signals after demodulation multiplexer module 12, this letter signal in crosspoint module 19 after route is handled, part signal is routed to n adaptation unit module 17 of south orientation and handles, become this OTU module 10 and will descend the tributary signal on road, the tributary signal after adaptation unit module 17 is handled can directly connect other upper layer device after the electric light conversion.Simultaneously, this locality of being transmitted by north orientation signal of setting out on a journey becomes the signal of telecommunication behind photoelectric conversion module 15, finish processes such as the encapsulation of the signal of setting out on a journey is adaptive via adaptation unit module 16 again, again with the west always up and down tributary signal does not merge in this locality, after multiplexer module 13, become the high-speed electrical signals that east orientation goes, finish the conversion of the signal of telecommunication through electrooptic conversion module 14 again, transmit to next website to light signal.
Need to prove, crosspoint module 19, demodulation multiplexer module 12 and multiplexer module 13 can be collectively referred to as scheduling unit, the general function of scheduling unit is exactly with from need outputing to adaptation unit 17 at the signal on this underground road in the signal of photoelectric conversion module 11, will from the signal of adaptation unit module 16 with after the signal on this underground road merges, do not output to electrooptic conversion module 14 from photoelectric conversion module 11.
In another preferred embodiment of the present invention, scheduler module can only be made of crosspoint module 19, is equivalent to remove demodulation multiplexer module 12 and multiplexer module 13 among Fig. 7.The input and output buffering is arranged in the crosspoint module 19, signal from photoelectric conversion module 11 is put in the input buffering, again the signal in the buffering area is sent selectively according to destination address, if need be on this underground road, then be sent to adaptation unit 17, if need be on this underground road, then be sent to electrooptic conversion module 14.
In another preferred embodiment of the present invention, scheduler module can only be made of demodulation multiplexer module 12 and multiplexer module 13, is equivalent to remove the crosspoint module 19 among Fig. 7.A part is connected to adaptation unit 17 in a plurality of output channels of demodulation multiplexer module 12 at this moment, need transmit from these paths at the signal on this underground road, and all the other paths are connected to multiplexer module 13, for need not transmitting at the signal on this underground road.Adaptation unit 16 is connected to multiplexer module 13, outputs to electrooptic conversion module 14 after the multiple signals that multiplexer module 13 is explained multiplexer module 12 and adaptation unit 16 in the future by oneself are merged into one the tunnel.
Utilize above-mentioned OTU module 10 to make up that OADM use for each node and the composition loop communicates and can improve the wavelength utilance, and when between all tandem node not being all exists under the situation about connecting completely between any two, the OTU of intermediate node is not to directly producing the relaying that is equivalent to No. a time that is connected with it, regeneration by light signal can effectively reduce the light signal deterioration problem that faces in the middle of the long Distance Transmission, and is also beneficial to improving system's optical signal quality.
According to the inner connection diagram of the one-way transmission OADM of a preferred embodiment of the present invention such as Fig. 8.
The one-way transmission OADM of this embodiment is by channel-splitting filter 20, and wave multiplexer 30 and OTU module 10 are formed.Channel-splitting filter 20 be used for receiving in the optical fiber light signal and with the transmission the different wave length passage separate, a plurality of different wave lengths that wave multiplexer 30 is responsible for importing close ripple and send, OTU module 10 obtains the wavelength that the line side is imported from a delivery outlet of channel-splitting filter 20, and the wavelength of OTU module 10 line sides output inserts an input port of wave multiplexer 30.
Above-mentioned one-way transmission OADM can also be improved to the OTU module 10 of traditional OTU and the present invention's proposition and mix the OADM that constitutes, and in a preferred embodiment of the present invention, the OTU that traditional OTU and the present invention propose mixes the inner connection diagram of OADM such as Fig. 9 of formation.
The OTU that proposes according to the traditional OTU of usefulness of a preferred embodiment of the present invention and the present invention mixes the OADM that constitutes, and (20-1,20-2), (30-1,30-2) (40-1 40-2) forms wave multiplexer 30 for OTU module 10 and traditional OTU module 40 by channel-splitting filter 20.
Wherein, channel-splitting filter 20-1, the annexation and the above-mentioned one-way transmission OADM of wave multiplexer 30-1 and OTU module 10 are identical.Tradition OTU module 40-1 obtains the line side input from the delivery outlet of channel-splitting filter 20-1, line side output is connected to the input port of wave multiplexer 30-2; Tradition OTU module 40-2 obtains the line side input from the delivery outlet of channel-splitting filter 20-2, line side output is connected to the input port of wave multiplexer 30-1.So traditional OTU module 40, channel-splitting filter 20 and wave multiplexer 30 have just constituted in logic and the identical OADM of traditional OA DM logic function shown in Figure 3.
The OTU module 10 of utilizing the present invention to propose also can constitute two-way OADM.Inside connection diagram such as Figure 10 of the two-way OADM that constitutes according to the OTU that proposes with the present invention of a preferred embodiment of the present invention.
(10-1 10-2) forms the two-way OADM that constitutes according to the OTU that proposes with the present invention of a preferred embodiment of the present invention by 20, two wave multiplexers 30 of two channel-splitting filters and OTU module 10.In fact, the two-way OADM that constitutes of the above-mentioned OTU that proposes with the present invention promptly is made of two one-way transmission OADM.Service logic relation by disposing two correspondences OTU module 10-1 and the annexation of 10-2 realize.Similarly, every OTU module 10 also can be arranged to the logic corresponding relation, unidirectional logical relation before still keeping, and finish the path protection function with an other OTU.It is to be noted: under the uni-directional series connected situation, business between all nodes that this configuration mode provides connects total bandwidth can not surpass line speed, and at two-way configuration mode, professional to connect total bandwidth relevant with the traffic assignments mode, the bandwidth calculation method when specifically available bandwidth can be with reference to the ADM equipment network.
The various OADM that use proposes above, the present invention will connect the business that has been modified on OTU unit client's side in the business of creating on the OADM originally and connect, connect thereby need not also will to distribute wavelength, saved wavelength, improved the utilization ratio of wavelength for low rate traffic.On each node, remain and adopt usual OADM to finish the add drop multiplex of light path, but not quite alike with traditional light path add drop multiplex, it only finishes unidirectional light path add drop multiplex, can connect for same group of OTU provides an annular like this, low rate traffic between each node connects with regard to shared this optical channel, and the business of other two-forty connects the OADM that still can adopt with traditional approach and finishes Wavelength Assignment.
Had after above-mentioned several OADM structure, can form recurrent network and loop network.Need to prove, be not that all nodes in an annular or the chain net all will be connected in series with the OTU module 10 among the present invention simultaneously, they both can all be connected in series, also can 3 or 3 above part of nodes serial connections, other wavelength also can be the serial connection between other some nodes, also can be traditional networking model method of attachment.
No matter be recurrent network or loop network, utilize OTU module 10 of the present invention all logically to constitute a ring.Logic connection diagram such as Figure 11 of in dense wavelength division multiplexing system, improving the system of wavelength utilance according to a preferred embodiment of the present invention.
For convenience of description, the OTU module 10 that the present invention proposes of only having drawn of the OTU in Figure 11, traditional OTU module 40 is not drawn, only adopt the node of traditional OTU module 40 also not draw.Those of ordinary skill in the art are appreciated that the OTU module 10 that adopts traditional OTU module 40 and the present invention to propose mixes the logic that the logic of the traditional OTU module 40 in the node of the OADM that constitutes is connected and adopts the node of the OADM that traditional OTU module 40 constitutes and connect the realization of being not difficult.
It is pointed out that the connection that comes and goes that chain connects between first node of network and the tail node is same physics route, so-called same physics route promptly refers to come and go, and what be connected with this node is identical node; And this connection is two diverse routes in the loop network, and so-called different route promptly refers to come and go, and what be connected with this node is different nodes.
The present invention includes a kind of optical interface processing method, comprise following steps:
Step 1: receive business from the previous node in line side.The business here is the mixture of a plurality of business, and wherein the professional destination of a part is local.The business of described last node can be unidirectional or two-way, does not have difference in the processing, and is different on business configuration.The logic configuration that two-way services connect as previously mentioned.
Step 2: with the destination is road under the local business.Comprise for professional passage up and down in this locality.
Step 3: with the destination is not that local business professional and the new access from this locality is mixed, and carries out wavelength Conversion and is sent to next described node by the line side.The business of described next node can be unidirectional or two-way.
Though by reference some preferred embodiment of the present invention, the present invention is illustrated and describes, but those of ordinary skill in the art should be understood that, can do various changes to it in the form and details, and the spirit and scope of the present invention that do not depart from appended claims and limited.
Claims (10)
1. the light transmitting element in the dense wavelength division multiplexing system is characterized in that, comprises first and second photoelectric conversion modules, scheduling unit, first and second electrooptic conversion modules, the first and second adaptation unit modules; Wherein
Described first and second photoelectric conversion modules are respectively applied for and will be converted to the signal of telecommunication from line side and local light signal of setting out on a journey;
Described scheduling unit is used for and will need outputs to described first adaptation unit at the signal on this underground road from the signal of described first photoelectric conversion module, will from the signal of the described second adaptation unit module with after the signal on this underground road merges, do not output to described second electrooptic conversion module from described first photoelectric conversion module;
The described first and second adaptation unit modules are respectively applied for and encapsulate with decapsulation the signal from described scheduling unit and described second photoelectric conversion module adaptive;
It is light signal that described first and second electrooptic conversion modules are respectively applied for the electrical signal conversion from described first adaptation unit module and described scheduling unit, and outputs to this locality and line side respectively.
2. the light transmitting element in the dense wavelength division multiplexing system according to claim 1 is characterized in that described scheduling unit comprises the crosspoint module;
Described crosspoint module is used for the signal of buffer memory from described first photoelectric conversion module, according to the destination address that is buffered signal select that this signal outputed to local described first adaptation unit or merge with signal from the described second adaptation unit module after output to described second electrooptic conversion module.
3. the light transmitting element in the dense wavelength division multiplexing system according to claim 1 is characterized in that, described scheduling unit comprises multiplexer module and conciliates multiplexer module;
It is parallel signal on a plurality of signalling channels that described demodulation multiplexer module is used for the one-channel signal demultiplexing from described first photoelectric conversion module, wherein the part signal passage is connected with described first adaptation unit, being used to transmit need be at the signal on this underground road, other signalling channels connect with described multiplexer module, and being used to transmit need be at the signal on this underground road;
Described multiplexer module is used for and will merges into one the tunnel from the multi-path parallel signal of described demodulation multiplexer module and described second adaptation unit, outputs to described second electrooptic conversion module.
4. the light transmitting element in the dense wavelength division multiplexing system according to claim 1 is characterized in that, described scheduling unit comprises multiplexer module, demodulation multiplexer module and crosspoint module;
It is multi-path parallel signal that described demodulation multiplexer module is used for the signal of telecommunication demultiplexing from described first photoelectric conversion module;
Described multiplexer module is used for and will merges into one the tunnel from the multi-path parallel signal of described crosspoint module;
Described crosspoint module be used for from described demodulation multiplexer module need output to described first adaptation unit at the signal on this underground road, will from the signal of the described second adaptation unit module with after the signal on this underground road merges, do not output to described multiplexer module from described demodulation multiplexer module.
5. the Optical Add Drop Multiplexer node in the dense wavelength division multiplexing system is characterized in that, comprises: first channel-splitting filter, first wave multiplexer and the first smooth transmitting element;
Described first channel-splitting filter is used for the multi-wavelength channel separation that will receive;
Described first wave multiplexer is used for the multi-wavelength passage of input is closed ripple and transmission;
The described first smooth transmitting element is used for discerning processing and demultiplexing into a plurality of low-speed parallel signals from the signal of an output port receiving lines side of described first channel-splitting filter, it with the destination road and export under the low speed signal of this node from client side port, with the destination is not that client's service signal that the low speed signal of this node and client side port insert mixes, and finishes an input port that outputs to described first wave multiplexer after the wavelength Conversion;
The output port that does not connect the described first smooth transmitting element in described first channel-splitting filter is connected with the input port of described first wave multiplexer.
6. the Optical Add Drop Multiplexer node in the dense wavelength division multiplexing system according to claim 5 is characterized in that, also comprises second channel-splitting filter, second wave multiplexer and first, second tradition first smooth transmitting element;
The described traditional first smooth transmitting element is used to finish the wavelength Conversion function;
The line side input of described first tradition, the first smooth transmitting element and an output port of described first channel-splitting filter are connected, and an input port of line side output and described second wave multiplexer is connected; The line side input of described second tradition, the first smooth transmitting element and an output port of described second channel-splitting filter are connected, and an input port of line side output and described first wave multiplexer is connected;
The output port that does not connect described traditional first smooth transmitting element in described second channel-splitting filter is connected with the input port of described second wave multiplexer.
7. the Optical Add Drop Multiplexer node in the dense wavelength division multiplexing system according to claim 5 is characterized in that, also comprises second channel-splitting filter, second wave multiplexer and the second smooth transmitting element;
The described second smooth transmitting element is used for discerning processing and demultiplexing from the signal of an output port receiving lines side of described second channel-splitting filter, it with the destination road and export under the signal of this node from client side port, with the destination is not that client's service signal that the signal of this node and client side port insert mixes, and finishes an input port that outputs to described second wave multiplexer after the wavelength Conversion;
The client side port of the described first smooth transmitting element is connected by logical circuit with the client side port of the described second smooth transmitting element;
The output port that described second channel-splitting filter does not connect the described second smooth transmitting element is connected with the input port of described second wave multiplexer.
8. the multiple spot optical communication network in the dense wavelength division multiplexing system is characterized in that, comprises at least 3 Optical Add Drop Multiplexer nodes connected in series successively;
Described node is used to insert the business from previous described node, is road under the low speed business of this node with the destination, is not that the low speed of this node is professional and mix and be sent to next described node from the new business that inserts of this node with the destination.
9. the multiple spot optical communication network in the dense wavelength division multiplexing system according to claim 8 is characterized in that, described Optical Add Drop Multiplexer node connects into annular or chain.
10. the optical interface processing method in the dense wavelength division multiplexing system is characterized in that, comprises following steps:
Reception is from the business of the previous node in line side;
With the destination is road under the local low speed business;
With the destination is not that local low speed business professional and the new access from this locality is mixed, and carries out wavelength Conversion and is sent to next described node by the line side.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2003101219022A CN100546235C (en) | 2003-12-05 | 2003-12-05 | Improve device, system and the method thereof of optical communications wavelength utilance |
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| CNB2003101219022A CN100546235C (en) | 2003-12-05 | 2003-12-05 | Improve device, system and the method thereof of optical communications wavelength utilance |
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| CN1625091A CN1625091A (en) | 2005-06-08 |
| CN100546235C true CN100546235C (en) | 2009-09-30 |
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| US7769256B2 (en) | 2007-04-13 | 2010-08-03 | Futurewei Technologies, Inc. | Method and system for performance monitor for digital optical DWDM networks |
| CN101998184B (en) * | 2009-08-12 | 2015-04-01 | 中兴通讯股份有限公司 | Adapting device and method |
| CN102882811B (en) * | 2012-09-10 | 2016-04-13 | 西安电子科技大学 | Based on data center light interconnection network system and the communication means of array waveguide grating |
| CN105429727B (en) * | 2015-12-30 | 2017-12-01 | 桂林创研科技有限公司 | A kind of intelligent optical add/drop multiplexer |
| CN107517115B (en) * | 2016-06-16 | 2021-11-12 | 中兴通讯股份有限公司 | Method and device for adjusting uplink and downlink services of service site |
| CN114285518B (en) * | 2020-09-28 | 2023-07-18 | 华为技术有限公司 | Optical communication system and connection relationship determination method |
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