CN1281018C - Node device for optical cross connection - Google Patents
Node device for optical cross connection Download PDFInfo
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- CN1281018C CN1281018C CNB011132752A CN01113275A CN1281018C CN 1281018 C CN1281018 C CN 1281018C CN B011132752 A CNB011132752 A CN B011132752A CN 01113275 A CN01113275 A CN 01113275A CN 1281018 C CN1281018 C CN 1281018C
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Abstract
The present invention relates to a node device for the optical cross connection, particularly to a node structure for the optical cross connection in an optical network. The present invention comprises paths by which a P line inputs signals to a kernel exchanging and processing part, a kernel exchanging and processing part, and paths by which the P line outputs the signals from the kernel exchanging and processing part, wherein each signal input path is composed of an optical preamplification OPA device and an optical demultiplexer unit ODU, and each signal output path is composed of a variable optical attenuator VOA array, an optical multiplexer unit OMU and an optical power amplifier OBA. The present invention realizes the functions of complete conversion of the partial wavelength, limited broadcast, electric regeneration for the partial wavelength, etc. Moreover, the present invention also realizes the function that upper and lower paths with arbitrary wavelength can arrive at the appointed port.
Description
Technical field
The invention belongs to the wave division multiplexing WDM field of optical networks in the optical fiber communication, be specifically related to the optical cross connection node structure in the optical-fiber network technology.
Background technology
In recent years, because with IP is the speed explosive growth of data service to double for 6～September of representative, transmission bandwidth has been produced huge demand, the network that extensively is adopted as of dense wave division multipurpose DWDM technology provides abundant bandwidth resources, but also makes network switching node become the bottleneck of network development simultaneously.For this reason, numerous equipment manufacturers and tissue have proposed the multiple solution of optical cross connect OXC node, to eliminate the node bottleneck, realize that big capacity, multi-service are merged, intelligentized optical transport network.
From whole communication network demand, following OXC node device need be finished full optical cross connect function, and functions such as designated port function, wavelength conversion function, broadcast capability, wavelength signals electricity regeneration function are arrived on the road about having any wavelength.The OXC node device should have modularity, extensibility simultaneously.But, because existing device level and correlation technique thereof full maturity not as yet, above-mentioned functions can't realize fully that still this is the problem that current OXC node structure designing institute faces.
Three kinds of schemes that present OXC node structure generally adopts: shown in Figure 1 is a kind of traditional OXC node structure, have p I/O link, n wavelength of transmission in every link, wavelength in the link is finished full light signal by light preamplifier OPA respectively and is amplified function and finish the branch wave energy by Optical Demultiplexing Unit ODU, adopt (p+m) * (p+m) with ripple switch fabric module and optical convering unit OTU module array then in the core, to realize setting out on a journey and the following road of m * n wavelength of m * n wavelength, finish by Optical Multiplexer Unit OMU at last and close wave energy and finish full light signal amplification function by power amplifier OBA.This scheme can not realize that any wavelength arrives designated port in the road up and down, lack flexibility, adopt OTU to realize the regeneration of wavelength signals electricity to all wavelengths simultaneously, have the cost costliness, lack the wavelength transparency and be difficult to realize shortcomings such as wavelength conversion and broadcast capability.
Shown in Figure 2 is another kind of OXC node structure commonly used, this structure has changed the optical convering unit OTU module among Fig. 1 into light adjustable attenuator VOA, and increase the OTU module of setting out on a journey, thus have the transparency of wavelength, have characteristics such as wavelength modularity and extensibility simultaneously.But this scheme is difficult to realize any wavelength equally and arrives designated port function, wavelength conversion and broadcast capability in the road up and down, and how to realize effectively that at the OXC node regeneration of wavelength signals electricity also is a problem.
Fig. 3 is other a kind of OXC node implementation that generally adopts, compare with scheme shown in Figure 1, the core adopts the large-scale optical cross-connect matrix of one (p * n+m) * (p * n+m) to replace n (p+m) * (p+m) with the ripple switching matrix, thereby realized that all wavelengths is complete intersection to designated port, complete wavelength conversion and wavelength signals electricity regeneration function, but because the scale of optical cross-connect matrix is too big, realize difficulty, the cost height, a large amount of OTU has further increased the OXC equipment cost, and this scheme shortage wavelength transparency, lacks the wavelength modularity, be not easy to expansion, be difficult to finish the limited broadcast function.
Summary of the invention
The objective of the invention is by to the statistical analysis of the actual service distribution of network and based on present device level, to have proposed a kind of node device for optical cross connection based on hierarchy in order to overcome the defective that each above-mentioned scheme exists.
By to the statistical analysis of optical transfer network demand as can be known optical transport network need not carry out complete intersection, wavelength conversion and electricity regeneration at each node, simultaneously the level of existing device impel us to adopt on a small scale switch matrix to realize more massive interconnection as far as possible and any wavelength of solving OXC up and down the road to designated port function, wavelength conversion, broadcast capability, wavelength signals electricity regeneration function.For this reason, a kind of node device for optical cross connection of proposing of the present invention is based on the OXC node apparatus of hierarchy: comprise that the p bar imports the path of core exchange processing section, core exchange processing section, p bar with the path of signal from core exchange processing section output with signal; OPA is put in advance by a light in wherein every bars input path, a demodulation multiplexer ODU forms, every bars outgoing route is made up of a variable optical attenuator VOA array, a multiplexer OMU and a power amplifier OBA, it is characterized in that: described core exchange processing section comprises that n (p+m) * (p+m) is with ripple switch fabric module, a m 2n * 2n adapter and m optical convering unit OTU group; Wherein: n (p+m) * (p+m) carries out the same ripple exchange of wavelength separately to the link signal of finishing through p demodulation multiplexer ODU behind the Wavelength branching respectively with the ripple switch fabric module, and the wavelength that will need road processing down simultaneously is by λ
1, λ
2... λ
nBe that a component becomes m group, send into m 2n * 2n adaptor module then respectively, with the ripple switch fabric module and receive m that the OTU group of setting out on a journey sends here and organize wavelength and set out on a journey signal, again link signal is delivered to variable optical attenuator VOA to finish interconnection;
In 2n * 2n adapter, increase power divider or adopt electric Cross module then can realize the limited broadcast function.
Description of drawings
Fig. 1 is traditional OXC structure implementation one schematic diagram
Fig. 2 is traditional OXC structure implementation two schematic diagrames;
Fig. 3 is traditional OXC structure implementation three schematic diagrames;
Fig. 4 is the OXC node structure schematic diagram based on hierarchy of the present invention.
Fig. 5 (a) and (b) are adapter specific implementation schematic diagrames of Fig. 4.
Fig. 6 provides the theory diagram that adopts power divider to realize the limited broadcast function.
Fig. 7 realizes the specific embodiments of the invention schematic diagram.
Embodiment
The present invention will be further described below in conjunction with drawings and Examples:
Fig. 1, Fig. 2, Fig. 3 illustrate in background technology.
Fig. 4 is the OXC node structure schematic diagram based on hierarchy of the present invention: this optical cross connection node is supported p bar input optical fibre link and p bar output optical fibre link (Line1, Line2......Line p), and input can be unequal with the output optical fibre number of links; Every optical fiber link transmits n wavelength channel (λ
1, λ
2... λ
n), the wavelength channel number of each link transmission can be unequal.Each with the ripple Switching Module simultaneously up and down the maximum m in road ((when the input and output link did not wait, m was not more than higher value wherein to the road wavelength of m≤p).), always total n with the ripple Switching Module, whole node can realize setting out on a journey m * n wavelength and following road m * n wavelength.By 2n * 2n adapter to above-mentioned m * n road wavelength handle can realize well any wavelength up and down the road to designated port function, the complete conversion of part wavelength, limited broadcast function and part wavelength electricity regeneration function.To be described in detail this node structure below:
Link signal at first puts OPA in advance through p light and p demodulation multiplexer ODU finishes Wavelength branching, enter core exchange processing section then and finish cross connect function, realize light power equalization through variable optical attenuator VOA array again, guarantee the light territory transparency of channel, finish wavelength through p multiplexer OMU and p power amplifier OBA at last and close that the road is laggard goes into the optical fiber link transmission.
The core processing that has essential distinction with traditional OXC structure comprises that partly three parts: n (p+m) * (p+m) organizes (OTU with ripple switch fabric module, a m 2n * 2n adapter and m optical convering unit OTU
1, OTU
2... OTU
n, wherein 1,2.....n corresponding wavelength λ respectively
1, λ
2... λ
n).
N (p+m) * (p+m) finishes the same ripple exchange of wavelength separately respectively with the ripple switch fabric module, will need the wavelength (the maximum m of each wavelength) of road processing down to press λ simultaneously
1, λ
2... λ
nOne component becomes m group to send into m 2n * 2n adaptor module respectively, and receives m that the OTU group of setting out on a journey sends here and organize the wavelength signal of setting out on a journey;
2n * 2n adapter receives the following road signal with the ripple Switching Module, and then returns to the ripple Switching Module by OTU, then finishes wavelength signals electricity regeneration function; If the road wavelength is inconsistent with the wavelength of setting out on a journey down, then when finishing wavelength signals electricity regeneration function, finished the part wavelength conversion function; If increase power divider or adopt electric Cross module then can realize the limited broadcast function at 2n * 2n adapter.
P in the optical cross connection node of the present invention n road multiplexing demultiplexing device, n (p+m) * (p+m) module, a m 2n * 2n adapter and m the optical convering unit OTU that sets out on a journey organize the different aspects that can regard as in the three-dimensional structure, if n (p+m) * (p+m) with the ripple Switching Module as the level course processing module, then m 2n * 2n adapter and m optical convering unit OTU that sets out on a journey organize the perpendicular layers processing module that can regard as with the level course quadrature, and p n road multiplexing demultiplexing device can be regarded side direction floor processing module as.Tradition OXC node structure is attempted to finish interconnection, part wavelength conversion, signal regeneration, limited broadcast function simultaneously at one deck or two layers of inside, and the result causes that complex structure, cost are too high, function is attended to one thing and lose sight of another.And OXC node technology of the present invention has been broken through the restriction of traditional thinking, the employing layering is handled, the particularly introducing of perpendicular layers and the cooperation by level course and perpendicular layers, realized well that when finishing full optical cross connect any wavelength arrives functions such as designated port, part wavelength conversion, signal regeneration, limited broadcast function in the road up and down, and clear in structure, each layer function is clear and definite, has modularization, is convenient to manufacture and design, cost reduces significantly.
Specifically describe the enforcement of perpendicular layers: Fig. 5 below and be 2n * 2n adapter finish any wavelength up and down the road to a kind of embodiment of designated port, the regeneration of wavelength signals electricity, the complete mapping function of part wavelength:
It is specific as follows that 2n shown in Fig. 5 (a) * 2n optical switch is finished 2n * 2n adaption function:
1) if n the wavelength (λ on following road
1, λ
2... λ
n) in λ
1Need wavelength signals regeneration, then wavelength X
1Exchange to the corresponding OTU (λ that sets out on a journey
1), realize the regeneration of wavelength signals electricity by OTU;
2) if n the wavelength (λ on following road
1, λ
2... λ
n) in wavelength X
1On light signal need transform to n wavelength (λ of an other link
1, λ
2... λ
n) in some wavelength on (suppose to transform to wavelength X
k), wavelength X then
1Exchange to the corresponding OTU (λ that sets out on a journey
k) on, realize the complete conversion of wavelength;
3) up and down then directly specified wavelength is connected with relative client equipment light mouth and gets final product to designated port in the road if need finish any wavelength by optical switch.
It shown in Fig. 5 (b) a 2n port input, the adapter of 2n port output and the combination schematic diagram of the OTU that sets out on a journey, adopt n 2 * 2 optical switches and a n * n optical switch to realize the adaption function of 2n * 2n among the figure: its function of finishing with Fig. 5 (a) road assignment function under not having is identical, and can reduce the scale of optical switch matrix.If need road assignment function down, then at D
1, D
2... D
nThe place connects another one n * n optical switch matrix and gets final product.
In the time will realizing the limited broadcast function, just replace (needing photoelectricity-electric light conversion) can finish the limited broadcast function at accompanying drawing 5 (a) and optical switch matrix electricity consumption switch matrix (b).Adopt this scheme, the signal on wavelength can be broadcast on the same wavelength in another link, also can be broadcast on other wavelength in another link.
Fig. 6 provides the theory diagram that adopts power divider to realize the limited broadcast function: when from come with the ripple Switching Module certain when once road signal or the local a certain signal demand of setting out on a journey are realized broadcast capability, at first pass through the 2n+1 port that the optical cross-matrix of 2n * (2n+1) intersects, then through 1: the 2n luminous-power distributor is dispensed to 2n 1 * 2 optical switch, at last by 1 * 2 optical switch according to the broadcasting connection request with setting out on a journey with the ripple Switching Module accordingly or this underground road that broadcast singal inserts, thereby realize the limited broadcast function.
Fig. 7 provides the specific implementation that the present invention supports the OXC node structure of 6 links/8 wavelength of every link: comprise OPA and OBA module, ODU and OMU module, VOA module, 8 * 8 with compositions such as ripple switch fabric module, the OTU module of setting out on a journey and 16 * 16 adaptation module, the same description in the face of Fig. 4 of specific implementation process.Can realize following function:
A) has full optical cross connect function;
B) has the same ripple exchange capacity of 6 links, every link 8 wavelength;
C) have any wavelength and arrive the designated port function in the road up and down, at most up and down 16 wavelength channels;
D) 16 wavelength channels have the complete ability to transform of wavelength;
E) 16 wavelength channels have electric power of regeneration;
F) have wavelength modularity and extensibility;
The cubicle switchboard that adopts small-scale based on the OXC node apparatus of hierarchy of the present invention Battle array is guaranteeing to finish enough interconnection abilities, is avoiding under the prerequisite of intra-node loss restriction, The road is complete to designated port function, part wavelength up and down to have realized simultaneously any wavelength among the OXC Total transform, limited broadcast function, part wavelength electricity regeneration function, and have the wavelength modularity And extensibility, keep simultaneously certain wavelength transparency, and can work as with lower cost solution Front network is to the demand of the aspects such as business scheduling, protection/recovery and reliability.
Claims (2)
1, a kind of node device for optical cross connection comprises that the p bar imports the path of core exchange processing section, core exchange processing section, p bar with the path of signal from core exchange processing section output with signal; OPA is put in advance by a light in wherein every bars input path, a demodulation multiplexer ODU forms, every bars outgoing route is made up of a variable optical attenuator VOA array, a multiplexer OMU and a power amplifier OBA, it is characterized in that: described core exchange processing section comprises that n (p+m) * (p+m) is with ripple switch fabric module, a m 2n * 2n adapter and m optical convering unit OTU group; Wherein: n (p+m) * (p+m) carries out the same ripple exchange of wavelength separately to the link signal of finishing through p demodulation multiplexer ODU behind the Wavelength branching respectively with the ripple switch fabric module, and the wavelength that will need road processing down simultaneously is by λ
1, λ
2... λ
nBe that a component becomes m group, send into m 2n * 2n adaptor module then respectively, with the ripple switch fabric module and receive m that the OTU group of setting out on a journey sends here and organize wavelength and set out on a journey signal, again link signal is delivered to variable optical attenuator VOA to finish interconnection;
M 2n * 2n adapter and m optical convering unit OTU group are used for finishing m * n wavelength and regenerate to designated port, part wavelength conversion and wavelength signals electricity on the road up and down; When the road is to designated port about finishing any wavelength, receive with the following road signal of ripple switch fabric module and be assigned to the equipment of corresponding native client floor by 2n * 2n adapter, and the equipment of the native client layer signal of setting out on a journey is delivered to the ripple switch fabric module by OTU and realized; When finishing the regeneration of wavelength signals electricity, 2n * 2n adapter receives the following road signal with the ripple Switching Module, and then returns to the ripple Switching Module by OTU; When finishing the part wavelength conversion, when promptly descending the road wavelength and the wavelength of setting out on a journey inconsistent, then when finishing wavelength signals electricity regeneration function, finished the part wavelength conversion function with the form of light/electricity/light.
2, a kind of node device for optical cross connection according to claim 1, it is characterized in that: described 2n * 2n adapter is when realizing the limited broadcast function, it is the 2n+1 port that intersects through the optical cross-matrix of a 2n * (2n+1), be dispensed to 2n 1 * 2 optical switch by the 1:2n luminous-power distributor then, at last by 1 * 2 optical switch according to the broadcasting connection request with setting out on a journey with the ripple Switching Module accordingly or this underground road that broadcast singal inserts.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011132752A CN1281018C (en) | 2001-07-02 | 2001-07-02 | Node device for optical cross connection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011132752A CN1281018C (en) | 2001-07-02 | 2001-07-02 | Node device for optical cross connection |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1394008A CN1394008A (en) | 2003-01-29 |
| CN1281018C true CN1281018C (en) | 2006-10-18 |
Family
ID=4660010
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB011132752A Expired - Lifetime CN1281018C (en) | 2001-07-02 | 2001-07-02 | Node device for optical cross connection |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1281018C (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060257145A1 (en) * | 2005-05-10 | 2006-11-16 | Nuzman Carl J | Multi-hop optical communication network |
| US7742705B2 (en) * | 2005-05-23 | 2010-06-22 | Futurewei Technologies, Inc. | System and method for chirped light source |
| US7430161B2 (en) * | 2005-06-24 | 2008-09-30 | Fujitsu Limited | Cross-connected cable interconnection |
| EP1897299B1 (en) * | 2005-06-30 | 2012-08-08 | Infinera Corporation | Modular adaptation and configuration of a network node architecture |
| CN101110652B (en) * | 2006-07-18 | 2010-08-18 | 中兴通讯股份有限公司 | Apparatus and method for supporting automatic optical fiber connecting configuration of optical transmission equipment |
| CN113259790B (en) * | 2021-05-18 | 2022-11-15 | 天津市誉航润铭科技发展有限公司 | Rearrangeable non-blocking full-cross optical cross connection matrix and control method thereof |
-
2001
- 2001-07-02 CN CNB011132752A patent/CN1281018C/en not_active Expired - Lifetime
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|---|---|
| CN1394008A (en) | 2003-01-29 |
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| PB01 | Publication | ||
| ASS | Succession or assignment of patent right |
Owner name: SHENZHENG CITY ZTE CO., LTD. Free format text: FORMER OWNER: SHENZHENG CITY ZTE CO., LTD. SHANGHAI SECOND INSTITUTE Effective date: 20030722 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20030722 Applicant after: Zhongxing Communication Co., Ltd., Shenzhen City Applicant before: Shanghai Inst. of No.2, Zhongxing Communication Co., Ltd., Shenzhen City |
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Granted publication date: 20061018 |