CN1369976A - Multifnctional light split/insersion multiplexer - Google Patents
Multifnctional light split/insersion multiplexer Download PDFInfo
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- CN1369976A CN1369976A CN02107389A CN02107389A CN1369976A CN 1369976 A CN1369976 A CN 1369976A CN 02107389 A CN02107389 A CN 02107389A CN 02107389 A CN02107389 A CN 02107389A CN 1369976 A CN1369976 A CN 1369976A
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Abstract
The invention belongs to the technique area of optical fiber communication, especially related to a new typed multi functional structure of optical division insert MUX. The invented MUX is composed of 2X2 optical switch, optical fiber amplifier with erbium being mixed into, optical MUX/Demultiplexer, module for balancing power, assigning up and down route, conversino of wavelength, multicast and module for regenerating. The main purpose of the invention is for protective rearranges of ring network (a kind of structure that possesses OADM basic functions, such as up and down route and loading additional operation). The OADM structure is accepted in ring network so as to support the protective rearranges in multiplexing segment and protective function in channels segment. Two fibers one way ring, four fibers two ways ring and two fibers to ways can be built by use of the invented structure.
Description
Technical field
The invention belongs to technical field of optical fiber communication, particularly a kind of optical add-drop multiplexer architecture of Multifunction.
Background technology
Optical add/drop multiplexer OADM (Optical add ﹠amp; Drop Multiplexer) main function is the function of road up and down of channel level, and its main application places is to be used for making up loop network.So to say that OADM is the key network element of present loop network.Utilize OADM also can realize linking to each other of metropolitan area network and backbone network in addition.
Along with the development on all optical network road and the explosive growth of the Internet/data service; make that the scale of network is increasing; data mutual in the network are more and more, therefore system and network survivability proposed very high requirement, promptly the protect networks ability proposed very high requirement.We know that loop network has very strong self-healing ability, and domestic present most of networks also are loop networks.In order to make full use of the loop network self-healing property, make up the online protection switch function of node supporting ring of loop network with regard to inevitable requirement.It is several to advise that according to ITU-T protection that we learn loop network has been divided into, at first with regard to its structure, have two fine unidirectional, two fine two-way and four-fiber bidirectionals.Its protected mode has path protection mode and multiplex section protection mode, in the path protection mode, headed by dividing again bridge cut-off connect with first section switch two kinds.Switch for path protection, require node only the passage that lost efficacy to be protected, multiplex section protection then is that the fault of multiplex section is just protected, promptly at some channel failure but during non-multiplex section fault, the protection that does not start multiplex section is switched.For former network; the defencive function of passage is only supported in two fine unidirectional rings; but for all optical network; if in two fine two-way and four-fiber bidirectionals, only support the protection of multiplex section layer; mean so under the channel failure situation and do not protect; this will cause a large amount of traffic losts and the waste of resource; so in all-optical network; all should be able to choose protected mode in the various loop networks according to actual conditions; in other words; node should be able to not only be supported the protection of multiplex section, also should support the protection of passage.
Existing OADM structure is generally all only supported simple road function up and down and the passage assignment function on road and the defencive function of multiplex section up and down.Fig. 1 is now typical OADM structure.
Be not difficult to find out that this structure only supports the two fine unidirectional and two-way multiplex section protection modes of two fibres; and owing to no any Cross Connect equipment between the passage of two links, so all can't support for any protected mode of path protection mode and two fine unidirectional rings.
Wherein 2 * 2 optical switches of link level are used to realize that the protection of multiplex section switches, and 2 * 2 switches of channel level are used for the function of road up and down of channel level, can carry out any assignment to road up and down by assigning up and down route in addition.
Content of the present invention
At the result of above-mentioned analysis, main purpose of the present invention is to switch (a kind of new O ADM structure that channel section and multiplex section propose (this structure possesses the basic function of OADM, as road up and down and load extra traffic) for the protection of loop network.Adopt this OADM structure in the looped network, not only can support the protection of multiplex section to switch, also can support the defencive function of channel section simultaneously; Not only can be used for two fine unidirectional rings, four-fiber bidirectional ring, can also be used to make up two fibre bidirectional loops.Increased the function of multicast, wavelength conversion and regeneration in addition, the mode of utilizing electric switch to add OTU is come these functions of integrated realization, has strengthened its modularization, can select its functional module flexibly according to the needs of real system.
In addition multicast functionality and up and down the road function be integrated in one, headed by a section bridge joint this path protection mode provide convenience, could realize otherwise the realization of this mode must add coupler, destroyed the overall structure of node.
The implementation of the object of the invention:
The optical add/drop multiplexer of a kind of Multifunction of the present invention is characterized in that:
1) this optical add/drop multiplexer is by 2 * 2 optical switches, erbium-doped fiber amplifier (EDFA), and optical multiplexer/demodulation multiplexer, power equalization module and assigning up and down route, wavelength conversion and multicast, regeneration module are formed;
2) input of this optical add/drop multiplexer passes through erbium-doped fiber amplifier respectively, inserts demodulation multiplexer then respectively, and the port number of demodulation multiplexer is decided by the number of channel multiplexing in the optical fiber;
3) each output of demodulation multiplexer all links to each other with the input of one 2 * 2 optical switch respectively, and 2 * 2 optical switches relevant with each demodulation multiplexer all are divided into equal two groups, and the connection of 2 * 2 optical switches relevant with these two demodulation multiplexers is symmetric relation, and an output of 2 * 2 optical switches of each demodulation multiplexer correspondence all correspondence is linked on the power equalization module;
4) another input of one group of switch in 2 * 2 optical switches relevant with demodulation multiplexer all links to each other with the assigning up and down route module respectively, the passage of the pairing demodulation multiplexer of these switches also becomes the service aisle on this direction, the input of one group of 2 * 2 optical switch that the remaining output of these switches is corresponding with another demodulation multiplexer links to each other, these passages of another demodulation multiplexer of these 2 * 2 optical switch correspondences also become the protection passage on this direction, and the remaining output of these 2 * 2 optical switches directly links to each other with the assigning up and down route module;
5) annexation of 2 * 2 optical switches of the protection passage correspondence of the annexation of the remaining one group of switch of demodulation multiplexer such as another demodulation multiplexer, the passage of their correspondences also is the protection passage on this direction; And the service aisle on this direction of the remaining one group of switch of another demodulation multiplexer;
6) passage is through converging to after the power equalization module on two multiplexers, and the passage of multiplexer and demodulation multiplexer is corresponding one by one, and then through one 2 * 2 optical switches, at last respectively through an erbium-doped fiber amplifier output.
Based on the optical add/drop multiplexer of above-mentioned Multifunction, the present invention also has and it is characterized in that
1) assigning up and down route, wavelength conversion and multicast, the interconnection of regeneration module utilization electricity, PIN and laser array are realized;
2) the head end bridge joint utilizes the multicast functionality at assigning up and down route module place to finish, and in loop network, the service aisle of head end bridge joint protection and protection passage just in time constitute whole loop.
3) extra traffic is being loaded under the trouble-free situation of system on the protection passage; the need protection cooperation of 2 * 2 optical switches on passage and the corresponding service aisle of its loading just can be finished; 2 * 2 optical switches that are about to two correspondences all are changed to the intersection attitude; and under system failure situation, extra traffic is removed immediately.
The download of Working service all needs the cooperation of the optical switch of service aisle and corresponding protection passage to cooperate to finish, promptly the optical switch of the service aisle of the passage correspondence on needs time road and coupled another to the protection passage on 2 * 2 optical switches all be changed to the intersection attitude.
4) channel layer realizes that service protection needs 2 * 2 optical switches on the service aisle of correspondence are crossed to the input of corresponding protection passage 2 * 2 optical switches, and will import that end that intersection outputs to connection light power equalization module and get final product.
In these functions, also guaranteed at last the professional transparency as far as possible; be that OADM is transparent to speed and business when execute protection is switched; the participation of the no signal of telecommunication in its structure of switching, only just opaque when needs carry out wavelength conversion and regeneration to speed and business.
Description of drawings
Fig. 1 is the background technology schematic diagram.
Fig. 2 is a structural representation of the present invention.
Fig. 3 is assigning up and down route of the present invention, wavelength conversion and multicast, regeneration module schematic diagram.
The schematic diagram of setting out on a journey that Fig. 4 cooperates for the present invention's two switches.
The following road schematic diagram that Fig. 5 cooperates for the present invention's two switches.
Fig. 6 is the looped network path protection schematic diagram of first section bridge joint of the present invention.
The path protection schematic diagram that Fig. 7 connects for the first bridge cut-off of the present invention.
Fig. 8 is road schematic diagram about the extra traffic under the normal condition of the present invention.
Fig. 9 realizes protection for channel layer of the present invention and switches schematic diagram.
The specific implementation form of the node structure of New O ADM of the present invention
Each several part function introduction and realization principle thereof.
Fig. 2 to Fig. 9 promptly introduces the composition of OADM each several part and the specific implementation way of function corresponding in detail for the decomposition of New O ADM node structure figure of the present invention.
The thinking of this invention:
For supporting the protection switch function of channel level in the looped network, the passage that different directions comes must be carried out interconnection.When considering looped network work, under normal circumstances promptly, always the path of half is used for work; the path of half is used for protection; in two fine unidirectional and four-fiber bidirectional rings, the whole paths in link are used for work, and the whole paths of the link of other direction are as protection.And for two fibre bidirectional loops, its each to link in, be a hemichannel job, a hemichannel gives over to the protection passage of other direction service aisle; When being system's fault-free; " leaving unused " state that has the passage of half to be in; and under the situation that system breaks down; service aisle on the other direction just can pour into these and be transmitted on idle passage originally; can find from above-mentioned analysis; in the two fine unidirectional and four-fiber bidirectional rings, its multiplexing protection is switched the protection that can utilize on the link and is switched switch and finish, the protection of two fibre bidirectional loops switch then can't utilize on the link switch switch and finish.So must between the protection passage of the co-wavelength of service aisle and other direction, add the protection that Cross Connect equipment just can realize passage in the looped network.Also promptly the multiplex section protection exchanging of two fibre bidirectional loops must be switched by the protection of channel layer and realizes.
In order not increase the cost of node structure, still adopt and realize with 2 * 2 optical switches that structure was identical in the past in addition, such two 2 * 2 switches will be gathered together could realize road function, protection switch function up and down, loads the extra traffic function.
Explanatory note:
1, assigning up and down route, wavelength conversion and multicast, regeneration function.As shown in Figure 3: in assigning up and down route, wavelength conversion and multicast, regeneration module, 1) utilize electric cross-connect module to realize the assignment and the multicast functionality thereof on road up and down; 2) utilize PIN, electricity to intersect and laser array is realized wavelength conversion, promptly will carry out road under the path of wavelength conversion
After the input of PIN, utilize the electric interdigital a certain road output that is fitted on again, the output laser on this road naturally can be with it
Change on the corresponding wavelength.3) regeneration function utilizes PIN and laser array to realize naturally.
2, road function up and down
Be different from general OADM structure, for not because of increasing the function budget increase, make the road up and down of some passage need the cooperation of two 2 * 2 optical switches just can finish, particularly, setting out on a journey, what need to cooperate is the passage that terminal does not directly link to each other with the assigning up and down route module on those, it is set out on a journey and need become the intersection attitude just can finish (wherein descending as shown in Figure 4, terminal is directly to connect) by one 2 * 2 switch through being adjacent.Following road need cooperate is those passages of directly not linking to each other with the assigning up and down route module of terminals down, and it need one 2 * 2 switch one-tenth intersection attitude through being adjacent just can be finished on road down.(as shown in Figure 5, wherein going up terminal is directly to connect)
3, the path protection of first section bridge joint; Fig. 6 is the schematic diagram of the looped network path protection of first section bridge joint of enforcement; this protected mode is the general channels protected mode of ITU-T suggestion; because OADM structure does not in the past have multicast functionality; so want to realize that this function must add coupler at the source end and realize; and utilize the multicast functionality at assigning up and down route module place to get final product among the present invention, and need not to add in addition coupler, both can support the path protection of first section bridge joint to switch.
Fig. 7 is given in New O ADM node and forms under the situation of looped network, the protection to the head end bridge joint of passage of realization.As shown in Figure 7, the protection of head end bridge joint should just in time constitute whole loop by two passes, and two passes is uncorrelated like this, so can fast and effeciently implement the protection to passage.
4, load extra traffic
Because loop network is when no-failure operation, its protection passage is in Idle state, for improving usage factor of system resource, allows to load extra traffic on the protection passage, in the OADM structure of the present invention, supports the loading of extra traffic, the concrete loading as shown in Figure 8.
This in fact professional loading and common business load as broad as long, and unique difference is that the business of this loading is not shielded, promptly when being taken place by fault, removes this business immediately.
5, channel layer is realized protecting and is switched
For explaining the implementation method of concrete function, as shown in Figure 9, establish the service aisle that A channel is a direction, the B passage is the protection path of A channel.Also have this OADM when making up looped network, two inputs and two outputs do not belong to unified section, and the output of an input and another input belongs to same section, and remaining a pair of input and output belong to same section.
As shown in Figure 9, if take passage to move to implement protection to resource, two related channel program 2 * 2 optical switches then should rationally regulating among the present invention are coordinated to finish.This also is of the present invention one big characteristics.Specifically can be applicable in the path protection mode in any loop network, in the protection of the two-way loop network of two fibres, will will realize in this way inevitably.Because the working mechanism of the loop network that two fibres are two-way is that two passages on the optical fiber are protected each other; the protection of two fibre bidirectional loops so switching, the protection of its multiplex section also need the protection of passage switching action just can finish, so will inevitably will adopt above-mentioned mode to realize.
Particularly; in the path protection mode; if service aisle breaks down; then the Working service in the service aisle switches on the optical switch at protection passage place via its 2 * 2 optical switch; 2 * 2 optical switches of protection passage become the intersection attitude; then Working service has been switched on another link direction and transmitted, so just finished protection this service aisle.
In the multiplex section protection mode of two fibre bidirectional loops; in case a certain link occurs fault; then service aisle should be switched to together on the corresponding protection passage and transmit; make sure to keep in mind in two fibre two-way multi-section guard rings; the node that execute protection is switched should all will switch to all service aisles on the protection passage, has so just finished the protection to multiplex section.
Advantage of the present invention
1, do not increasing on the basis of device, strengthening the function of system.
2, having overcome structure in the past can not supporting ring Netcom pipe protection and the shortcoming of two fine bidirectional protectives, so that this structure can Be used for making up any loop network, and can choose suitable protection scheme according to actual needs. Can be used for making up two Fine unidirectional, two is fine two-way, and the four-fiber bidirectional loop network can also be direct with the SDH network by the assigning up and down route module Link to each other.
3, need not to add coupler, utilize the broadcast capability of setting out on a journey at assigning up and down route module place just can realize highway section two Road and bridge connection function, this is convenient to be combined with ITU-T two fine unidirectional path protection rings, namely is convenient to the interconnection at SDH networking mutual Logical.
4, upper and lower road assignment function, broadcast capability, wavelength conversion function and regeneration are integrated in one. And various Function all is very easy to realize.
5, not only can utilize the action of channel layer that network is protected, and can only rely on multiplex section layer switch Action protect, improved the flexibility of system protection.
When 6, switching for straight-through and execute protection, system can guarantee business and rate transparency.
Illustrate:
Present OADM structure is not supported the protection of channel level in the looped network, and the node among the present invention is supported the guarantor of channel level Protect, this also is the advantage of maximum of the present invention. Because later optical-fiber network is all pursued high power capacity, or just pursue thus Step is adopted the mode of DWDM, and present node also pursuing the T bit capacity, so the port number on the node more Come more manyly, only portion of channel breaks down and that the trouble-proof probability of whole link is is sizable. At this In kind of the situation, present OADM only has two kinds for the treatment of measures: a, reaches faulty channel in the mode of link protection Protection, b does not protect. The method of not protecting obviously is worthless, if but take the method for a, because when switching Must cause to the channel service of switching certain damage, so implement guarantor to passage in the mode of the protection of link Protect, will inevitably cause the impact of the performance of the passage that does not break down. And this structure of the present invention, because at node Inner two-way passage generation interconnection, so it supports the protection of channel level, namely can be to the passage that breaks down Protect, and do not affect other normal passage. And path protection mode and multiplex section protection mode all supported, In the situation that channel failure only takes place, start the protected mode of passage like this, in the situation that link failure takes place, The protection that starts multiplex section is switched, so that protection is very flexible.
Claims (6)
1, a kind of optical add/drop multiplexer of Multifunction is characterized in that:
1) this optical add/drop multiplexer is by 2 * 2 optical switches, erbium-doped fiber amplifier, and optical multiplexer/demodulation multiplexer, power equalization module and assigning up and down route, wavelength conversion and multicast, regeneration module are formed;
2) input of this optical add/drop multiplexer passes through erbium-doped fiber amplifier respectively, inserts demodulation multiplexer then respectively;
3) each output of demodulation multiplexer all links to each other with the input of one 2 * 2 optical switch respectively, and 2 * 2 optical switches relevant with each demodulation multiplexer all are divided into equal two groups, and the connection of 2 * 2 optical switches relevant with these two demodulation multiplexers is symmetric relation, and an output of 2 * 2 optical switches of each demodulation multiplexer correspondence all correspondence is linked on the power equalization module;
4) another input of one group of switch in 2 * 2 optical switches relevant with demodulation multiplexer all links to each other with the assigning up and down route module respectively, the passage of the pairing demodulation multiplexer of these switches also becomes the service aisle on this direction, the input of one group of 2 * 2 optical switch that the remaining output of these switches is corresponding with another demodulation multiplexer links to each other, these passages of another demodulation multiplexer of these 2 * 2 optical switch correspondences also become the protection passage on this direction, and the remaining output of these 2 * 2 optical switches directly links to each other with the assigning up and down route module;
5) passage is through converging to after the power equalization module on two multiplexers, and the passage of multiplexer and demodulation multiplexer is corresponding one by one, and then through one 2 * 2 optical switches, at last respectively through an erbium-doped fiber amplifier output.
2,, it is characterized in that the interconnection of assigning up and down route, wavelength conversion and multicast, regeneration module utilization electricity, PIN and laser array realize according to the optical add/drop multiplexer of claim 1 Multifunction.
3, according to the optical add/drop multiplexer of claim 1 Multifunction, it is characterized in that the head end bridge joint utilizes the multicast functionality at assigning up and down route module place to finish, in loop network, the service aisle of head end bridge joint protection and protection passage just in time constitute whole loop.
4, according to the optical add/drop multiplexer of claim 1 Multifunction; the download that it is characterized in that Working service all needs the cooperation of the optical switch of service aisle and corresponding protection passage to cooperate to finish, promptly the optical switch of the service aisle of the passage correspondence on needs time road and coupled another to the protection passage on 2 * 2 optical switches all be changed to the intersection attitude.
5, according to the optical add/drop multiplexer of claim 1 Multifunction; it is characterized in that extra traffic is being loaded under the trouble-free situation of system on the protection passage; the need protection cooperation of 2 * 2 optical switches on passage and the corresponding service aisle of its loading just can be finished; 2 * 2 optical switches that are about to two correspondences all are changed to the intersection attitude; and under system failure situation, extra traffic is removed immediately.
6, according to the optical add/drop multiplexer of claim 1 Multifunction; it is characterized in that channel layer realization service protection needs 2 * 2 optical switches on the service aisle of correspondence are crossed to the input of corresponding protection passage 2 * 2 optical switches, and will import that end that intersection outputs to connection light power equalization module.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB021073899A CN1162998C (en) | 2002-03-19 | 2002-03-19 | Multifnctional light split/insersion multiplexer |
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| CNB021073899A CN1162998C (en) | 2002-03-19 | 2002-03-19 | Multifnctional light split/insersion multiplexer |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1301601C (en) * | 2003-04-15 | 2007-02-21 | 中兴通讯股份有限公司 | Device of full light network reusing segment shared protection |
| WO2008028362A1 (en) * | 2006-08-28 | 2008-03-13 | Zte Corporation | An configurable optical add and drop multiplexer device for realizing the monodirectional and polydirectional wavelength dispatch |
| CN1787516B (en) * | 2004-12-10 | 2010-04-14 | 北京邮电大学 | Novel ring network access controlling protocol |
| CN101019359B (en) * | 2004-10-06 | 2010-12-01 | 思科技术公司 | Reconfigurable WDM ADM and method for operating ADD node |
| CN101420286B (en) * | 2007-10-23 | 2012-02-08 | 中兴通讯股份有限公司 | Configurable OADM apparatus for realizing flexible wavelength scheduling |
| CN101192889B (en) * | 2006-11-29 | 2012-04-11 | 株式会社日立制作所 | Light transmission device with light amplifier |
| CN101141221B (en) * | 2007-06-22 | 2012-05-09 | 中兴通讯股份有限公司 | Configurable OADM device |
| CN101222277B (en) * | 2008-02-02 | 2012-05-30 | 烽火通信科技股份有限公司 | WSS type ROADM transmission equipment and optical channel power automatic equalization method of WSS type ROADM transmission equipment |
| CN107819522A (en) * | 2016-09-14 | 2018-03-20 | 中国电信股份有限公司 | ROADM equipment, optical network system and transmission method |
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2002
- 2002-03-19 CN CNB021073899A patent/CN1162998C/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1301601C (en) * | 2003-04-15 | 2007-02-21 | 中兴通讯股份有限公司 | Device of full light network reusing segment shared protection |
| CN101019359B (en) * | 2004-10-06 | 2010-12-01 | 思科技术公司 | Reconfigurable WDM ADM and method for operating ADD node |
| CN1787516B (en) * | 2004-12-10 | 2010-04-14 | 北京邮电大学 | Novel ring network access controlling protocol |
| WO2008028362A1 (en) * | 2006-08-28 | 2008-03-13 | Zte Corporation | An configurable optical add and drop multiplexer device for realizing the monodirectional and polydirectional wavelength dispatch |
| CN101136717B (en) * | 2006-08-28 | 2011-05-11 | 中兴通讯股份有限公司 | Configurable OADM device of implementing single, polydirectional wavelength scheduling |
| CN101192889B (en) * | 2006-11-29 | 2012-04-11 | 株式会社日立制作所 | Light transmission device with light amplifier |
| CN101141221B (en) * | 2007-06-22 | 2012-05-09 | 中兴通讯股份有限公司 | Configurable OADM device |
| CN101420286B (en) * | 2007-10-23 | 2012-02-08 | 中兴通讯股份有限公司 | Configurable OADM apparatus for realizing flexible wavelength scheduling |
| CN101222277B (en) * | 2008-02-02 | 2012-05-30 | 烽火通信科技股份有限公司 | WSS type ROADM transmission equipment and optical channel power automatic equalization method of WSS type ROADM transmission equipment |
| CN107819522A (en) * | 2016-09-14 | 2018-03-20 | 中国电信股份有限公司 | ROADM equipment, optical network system and transmission method |
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