CN104869480A - ROADM (Reconfigurable Optical Add/Drop Multiplex) switching node device and method having traffic grooming function - Google Patents
ROADM (Reconfigurable Optical Add/Drop Multiplex) switching node device and method having traffic grooming function Download PDFInfo
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- CN104869480A CN104869480A CN201510213238.7A CN201510213238A CN104869480A CN 104869480 A CN104869480 A CN 104869480A CN 201510213238 A CN201510213238 A CN 201510213238A CN 104869480 A CN104869480 A CN 104869480A
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Abstract
The invention provides an ROADM (Reconfigurable Optical Add/Drop Multiplex) switching node device and method having a traffic grooming function. The device comprises a wavelength switching colorless directionless ROADM unit and a sub-wavelength traffic grooming unit. The method comprises the following steps: (1) broadcasting wavelength traffic to all wavelength selection switches by an optical divider; (2) selecting a wavelength channel carrying the traffic by the wavelength selection switches; and (3) if the wavelength traffic is direct forwarding traffic, transmitting the wavelength traffic to a corresponding output port through a specified wavelength selection switch, and allowing other wavelength selection switches to discard the wavelength traffic; and if the wavelength traffic is traffic requiring traffic grooming, transmitting the wavelength traffic to a traffic grooming sub-module through the specified wavelength selection switch for performing wavelength traffic grooming, and allowing other wavelength selection switches to discard the wavelength traffic. Through adoption of the ROADM switching node device and method, electric domain traffic grooming and optical domain wavelength switching functions are integrated, and wavelength-level traffic grooming and flexible scheduling are realized on an electric layer for the uplink and downlink of user side traffic and forwarding traffic.
Description
Technical field
The present invention relates to a kind of switching node apparatus and method, be specifically related to a kind of ROADM switching node apparatus and method with traffic grooming function.
Background technology
In recent years, conventional telecommunications business constantly declines, and indicate the most significant development trend of telecommunications industry with the Novel electric communication service that cloud computing, Web TV (IPTV), Internet of Things etc. are representative, Novel electric communication service is proposed higher requirement for the service quality of IP bearer network and transport network, safety and reliability, electric layer organization network oneself far can not meet user and huge bandwidth demand is proposed to network, so transmission network is from electric layer network to photosphere network Development.Optical communication particularly wavelength-division multiplex technique (Wavelength Division Multiplex) can meet the requirement of capacity, distance, transmission quality to a great extent, and makes optical-fiber network become the main frame of communication transport network.
Existing ROADM (Reconfigurable Optical Add/Drop Multiplex) makes light path no longer need manual intervention reconfiguring of intermediate node, but still need technical staff to be configured to light path two ends end node light path, the higher dynamic characteristic of Novel electric communication service and unpredictability can not be adapted to, therefore ROADM (the CDC-ROADM of future generation with colourless, undirected, clog-free three new features solving flexibility problem is devoted to, Colorless, Directionless, Contentionless) arise at the historic moment.But in actual applications, the full light traffic scheduling of the long rank of wavelet of pure photosphere and dredge feasible far away, needs to overcome many difficulties.Present stage in electrical domain, carry out handshaking and multiple connection realizes the feasible method that height is dynamic, services of large granularities are dredged.The optical-fiber network switching node of the current overwhelming majority uses the electric switching equipment and optical switching device that are separated.Its major defect is that network system needs two to overlap independently equipment, is interconnected complexity, and needs coordinated management two complete equipment, cause the increase of equipment cost and operation cost between the equipment of separation; Two complete equipments need the interface provided to each other, and equipment cost increases; Level of integrated system is low, and storage rack district volume is large, and energy consumption is high.
The people such as V.Eramo propose the switching node structure of a kind of light-electrical-optical conversion.This structure carries out opto-electronic conversion to all signals entering node, and all signals sent from node carry out electro-optic conversion, can realize wavelength and exchange and the long traffic grooming of wavelet.But it is large that its desirable PIC device used realizes difficulty, also needs research and development chronically.In addition, this switch carries out light electro-optic conversion equally to other exchange of wavelength level, fails to effectively utilize the ability that ROADM exchanges optical wavelength.Device architecture is complicated, and power consumption is comparatively large, and operating cost is higher.
The people such as the Mark D.Feuer in U.S. AT & T laboratory and the Paparap Palacharla in Fujitsu laboratory propose the structure that a kind of user's of use sidelight cross connect machine shares transceiver module.The ROADM structure of this shared transceiver module can solve the race problem of intra-node effectively, namely realizes the routing algorithm of ROADM.But this structure only supports that on photosphere face, other repeat in work of wavelength level connects, and does not possess the functions such as the long traffic grooming of wavelet.
Summary of the invention
In order to overcome above-mentioned the deficiencies in the prior art, the invention provides a kind of ROADM switching node apparatus and method with traffic grooming function, this device is a kind of photoelectric hybrid switching node structure, electrical domain traffic grooming and area of light wavelength function of exchange is integrated with in a node, the road up and down of user's side business and forwarding service are realized in electric layer to traffic grooming and the flexible dispatching of the long rank of wavelet, to direct forwarding service, photosphere realizes quick exchange and the bulk transaction of business.
In order to realize foregoing invention object, the present invention takes following technical scheme:
Have a ROADM switching node device for traffic grooming function, described device comprises wavelength and exchanges colourless undirected ROADM unit and the long traffic grooming unit of wavelet.
In optimal technical scheme provided by the invention, described wavelength exchanges colourless undirected ROADM unit and is made up of optical branching device, wavelength-selective switches and connecting fiber, described optical branching device is to the wavelength service broadcast entering node, and the wavelength channel of described wavelength-selective switches to bearer service is selected.
In second optimal technical scheme provided by the invention, the long traffic grooming unit of described wavelet is made up of electrical domain crosspoint and several traffic grooming submodules, described traffic grooming submodule is made up of the upper and lower road port array in wavelength-selective switches, transceiver array and user side, described wavelength-selective switches carries out multiplex/demultiplex to the wavelength channel of bearer service, dredge in submodule at different business, realize interconnecting by electrical domain crosspoint between the upper and lower road port array of described transceiver array and user side.
In 3rd optimal technical scheme provided by the invention, one has traffic grooming function ROADM switching method, and described method comprises the steps:
(1) wavelength business is broadcast in all wavelengths selector switch by optical branching device;
(2) wavelength channel of wavelength-selective switches to bearer service is selected;
(3) if wavelength business directly forwarding service, then the wavelength-selective switches by specifying, is sent to corresponding output port, and all the other wavelength-selective switches then abandon this wavelength business; If wavelength business needs traffic grooming business, then the wavelength-selective switches by specifying, is sent to traffic grooming submodule, carries out wavelength traffic grooming, and all the other wavelength-selective switches then abandon this wavelength business.
In 4th optimal technical scheme provided by the invention, described wavelength traffic grooming comprises the steps:
A, wavelength business is entered electrical domain crosspoint after receiver opto-electronic conversion carry out traffic grooming, be integrated into new wavelength business;
B, exchange in corresponding transmitter, carry out Wavelength matched and electro-optic conversion
C, carried out optical wavelength multiplexing by wavelength-selective switches, be sent to corresponding splitter;
D, splitter are broadcast in all wavelengths selector switch, and appointed wavelength-selective switches is selected, and be sent to corresponding output port, all the other wavelength-selective switches then abandon this wavelength business.
In 5th optimal technical scheme provided by the invention, in described traffic grooming submodule, on user side, road port produces business of setting out on a journey, described business of setting out on a journey, in electrical domain crosspoint, carries out traffic grooming together with the wavelength business needing traffic grooming, is integrated into new wavelength business and exports.
In 6th optimal technical scheme provided by the invention, in described traffic grooming submodule, under user side, road port exports lower road business, and described lower road business is exchanged in electrical domain crosspoint to be exported to lower road port.
Compared with prior art, beneficial effect of the present invention is:
The without hindrance plunger type ROADM switching node device with traffic grooming function that the present invention proposes is a kind of photoelectric hybrid switching node structure, electrical domain traffic grooming and area of light wavelength function of exchange is integrated with in a node, the road up and down of user's side business and forwarding service are realized in electric layer to traffic grooming and the flexible dispatching of the long rank of wavelet, to direct forwarding service, photosphere realizes quick exchange and the bulk transaction of business.
This node structure gives full play to both advantage, optical wavelength can be avoided to exchange unnecessary light electro-optic conversion, substitute electric switching equipment and the optical switching device of separate type, reduce switch volume, power consumption and cost, the bandwidth of vast capacity is not only provided, solve Large Copacity and transmit problem, significantly reduce the pressure of electric treatment on intermediate node, and solve the problem such as traffic grooming and the competition of ROADM switching node internal transceiver, the high dynamic of Novel electric communication service and the feature of unpredictability can be tackled, guarantee the flexible of network and utilization of resources.
Accompanying drawing explanation
Fig. 1 is the clog-free ROADM switching node structure drawing of device with traffic grooming function
Fig. 2 is the clog-free ROADM switching method flow chart with traffic grooming function
Fig. 3 is forwarding service and user side upper and lower road traffic grooming schematic diagram
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail.
As shown in Figure 1, there is the without hindrance plunger type ROADM switching node device of traffic grooming function, comprise the CD-ROADM unit and the long traffic grooming unit of wavelet that carry out the exchange of wavelength rank.Described wavelength exchanges CD-ROADM unit and is made up of 2N splitter and 2N wavelength-selective switches and optical fiber.Described optical branching device is to the wavelength service broadcast entering node, and the wavelength channel of described wavelength-selective switches to bearer service is selected.
The long traffic grooming unit of described wavelet, comprises electrical domain crosspoint and several traffic grooming submodules composition.The number of traffic grooming submodule is equal with node degree.Described electrical domain crosspoint can by other business of wavelength level with time decomposition multiplex mode resolve into the long business of multiple wavelet, or long for multiple wavelet business is multiplexed into other business of wavelength level in a time multiplexed manner, and can antithetical phrase wavelength business carry out dredging and exchanging in Time and place two dimensions.Described traffic grooming submodule is made up of the upper and lower road port array in wavelength-selective switches, transceiver array and user side.Be used for the multiple wavelength optical signal of input to demultiplex into Single wavelength signal at the wavelength-selective switches of traffic grooming submodule input side, after receiver opto-electronic conversion, give electrical domain crosspoint process; Or at traffic grooming submodule outlet side, the wavelength signals (carrying out electro-optic conversion by transmitter) that electrical domain crosspoint exports is multiplexed into multiple wavelength optical signal.Described wavelength-selective switches carries out multiplex/demultiplex to the wavelength channel of bearer service.Described transceiver array realizes the mutual conversion between wavelength level other light signal and signal of telecommunication, transceiver quantity distribution according to need in transceiver array, the little or number of wavelengths that equals in optical fiber link.Described user side up/down road port array is for send/receive the up/down road business of local user side.Dredge in submodule at different business, realize interconnecting by electrical domain crosspoint between the upper and lower road port array of described transceiver array and user side.
As shown in Figure 2, have the without hindrance plunger type ROADM switching method of traffic grooming function, the method concrete steps are as follows:
(1) wavelength business is broadcast in all wavelengths selector switch by optical branching device;
(2) wavelength channel of wavelength-selective switches to bearer service is selected;
(3) if wavelength business directly forwarding service, then the wavelength-selective switches by specifying, is sent to corresponding output port, and all the other wavelength-selective switches then abandon this wavelength business; If wavelength business needs traffic grooming business, then the wavelength-selective switches by specifying, is sent to traffic grooming submodule, carries out wavelength traffic grooming, and all the other wavelength-selective switches then abandon this wavelength business.
Described wavelength traffic grooming comprises the steps:
A, wavelength business is entered electrical domain crosspoint after receiver opto-electronic conversion carry out traffic grooming, be integrated into new wavelength business;
B, exchange in corresponding transmitter, carry out Wavelength matched and electro-optic conversion
C, carried out optical wavelength multiplexing by wavelength-selective switches, be sent to corresponding splitter;
D, splitter are broadcast in all wavelengths selector switch, and appointed wavelength-selective switches is selected, and be sent to corresponding output port, all the other wavelength-selective switches then abandon this wavelength business.
In described traffic grooming submodule, on user side, road port produces and to set out on a journey business, described in set out on a journey business in electrical domain crosspoint, carry out traffic grooming together with the wavelength business needing traffic grooming, be integrated into new wavelength business and export.
In described traffic grooming submodule, under user side, road port exports lower road business, and described lower road business is exchanged in electrical domain crosspoint to be exported to lower road port.
Be illustrated in figure 3 forwarding service and user side upper and lower road traffic grooming schematic diagram, link medium wave long number W=4, node degree N=3, the maximum wavelet long business number F=3 comprised in wavelength business.Illustrate the symbol implication of representative wavelength business and the long business of wavelet used in Fig. 3 below.
Capitalization represents the numbering of business, the long business of numeral wavelet, subscript represents that business inputs the direction (N or E or W) of this node or this locality and to set out on a journey business (add), and subscript represents routing direction (N or E or W) or this underground road business (drop) of business.Illustrate:
wavelength business A enters node from east (E), need be forwarded to west (W);
wavelength business J enters node from north (N), comprises
with
two forward subservice, need respectively to be forwarded to west (W) and east (E);
wavelength business H enters node from north (N), wherein
for forwarding subservice, west (W) need be forwarded to,
for this underground way business;
wavelength business F enters node from west (W), need, on this underground road, be this underground road wavelength business;
wavelength business after dredging, need be forwarded to west (W), is all made up of forwarding subservice;
wavelength business after dredging, need be forwarded to east (E), by forwarding subservice
to set out on a journey subservice with this locality
composition;
set out on a journey wavelength business N in this locality, need be forwarded to north (N).
It should be noted that there is not the direction that the enters node wavelength business identical with routing direction and the long business of wavelet, as
or
in same wavelength business, the long service needed of different wavelets is forwarded on different directions.The wavelength business on this underground road as
or the long business of wavelet as
may need to exchange to multiple lower road port, no longer segment here.
In figure 3, suppose the wavelength business that enters from node three directions and carrying wavelength as shown in table 1:
Table 1 enters wavelength business and the carrying wavelength thereof of node
λ 3 carrier wave in the optical fiber of its Middle East (E) direction and the non-bearer service of λ 2 carrier wave in the optical fiber of (W) direction, west.
The wavelength business set out on a journey in this locality has
with
The wavelength business of direct forwarding
wSS on west, fiber direction (W) required by it selects and is sent to fiber west (W), and the wavelength carrying this business remains unchanged, and is still λ 1.
Business B-J enters other business of wavelength level that node needs traffic grooming, and it enters corresponding traffic grooming submodule after being selected by corresponding wavelength-selective switches WSS.Be used for the multiple wavelength optical signal of input to demultiplex into multiple Single wavelength signal at the wavelength-selective switches of traffic grooming submodule input side, after receiver opto-electronic conversion, give electrical domain crosspoint process.Electrical domain crosspoint is by this underground road wavelength business
exchange to lower road port, by wavelength business B and wavelength business J with time decomposition multiplex mode demultiplex into each and forward subservice and this underground way business.This underground way business wherein as
with
exchange to lower road port.Forwarding subservice wherein and this locality subservice of setting out on a journey further is dredged.
The wavelength business set out on a journey in this locality, as
with
by electrical domain crosspoint with time decomposition multiplex mode demultiplex into the long business of multiple wavelet after dredge with forwarding subservice, the subservice with identical fiber direction with time decomposition multiplex mode be multiplexed into a new wavelength business, as
with
the wavelength of this new wavelength business can not conflict mutually with the wavelength of the business directly forwarded, such as
wavelength can not be set to λ 1, this is because business
be forwarded to west (W) afterwards its wavelength remain λ 1.
The wavelength business set out on a journey in this locality
do not need to split into subservice, but directly exchanged by electrical domain crosspoint, and route to its output, become the wavelength business after dredging.
At this node after traffic grooming, the wavelength business after dredging and carrying wavelength as shown in table 2:
Table 2 dredge after wavelength business and carrying wavelength
At traffic grooming submodule outlet side, the wavelength business after dredging is sent to corresponding optical sender and carries out Wavelength matched and electro-optic conversion, and multiple Single wavelength light signal is multiplexed with multiple wavelength optical signal by wavelength-selective switches WSS.Wavelength business after dredging is broadcast in all wavelengths selector switch by the optical branching device that wavelength exchanges in CD-ROADM unit, more appointed wavelength-selective switches is selected, and is sent to corresponding output port, and all the other wavelength-selective switches then abandon this wavelength business.
It is emphasized that if each traffic grooming submodule uses special separately electrical domain crosspoint, and the shared electrical domain crosspoint adopted in non-invention, then set out on a journey wavelength business in this locality
,
to compete due to transceiver and block.Owing to present invention employs shared electrical domain crosspoint, in different traffic grooming submodules, realize interconnecting by shared electrical domain crosspoint between transceiver array and user side upper and lower road port array, solve the race problem of ROADM intra-node transceiver, realize the routing algorithm of ROADM node, the long business of wavelet of therefore setting out on a journey
other traffic grooming submodule can be exchanged to, transmission of setting out on a journey.
Finally should be noted that: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit, although with reference to above-described embodiment to invention has been detailed description, those of ordinary skill in the field are to be understood that: still can modify to the specific embodiment of the present invention or equivalent replacement, and not departing from any amendment of spirit and scope of the invention or equivalent replacement, it all should be encompassed in the middle of right of the present invention.
Claims (7)
1. have a ROADM switching node device for traffic grooming function, it is characterized in that, described device comprises wavelength and exchanges colourless undirected ROADM unit and the long traffic grooming unit of wavelet.
2. switching node device according to claim 1, it is characterized in that, described wavelength exchanges colourless undirected ROADM unit and is made up of optical branching device, wavelength-selective switches and connecting fiber, described optical branching device is to the wavelength service broadcast entering node, and the wavelength channel of described wavelength-selective switches to bearer service is selected.
3. switching node device according to claim 1, it is characterized in that, the long traffic grooming unit of described wavelet is made up of electrical domain crosspoint and several traffic grooming submodules, described traffic grooming submodule is made up of the upper and lower road port array in wavelength-selective switches, transceiver array and user side, described wavelength-selective switches carries out multiplex/demultiplex to the wavelength channel of bearer service, dredge in submodule at different business, realize interconnecting by electrical domain crosspoint between the upper and lower road port array of described transceiver array and user side.
4. have a traffic grooming function ROADM switching method, it is characterized in that, described method comprises the steps:
(1) wavelength business is broadcast in all wavelengths selector switch by optical branching device;
(2) wavelength channel of wavelength-selective switches to bearer service is selected;
(3) if wavelength business directly forwarding service, then the wavelength-selective switches by specifying, is sent to corresponding output port, and all the other wavelength-selective switches then abandon this wavelength business; If wavelength business needs traffic grooming business, then the wavelength-selective switches by specifying, is sent to traffic grooming submodule, carries out wavelength traffic grooming, and all the other wavelength-selective switches then abandon this wavelength business.
5. switching method according to claim 4, it is characterized in that, described wavelength traffic grooming comprises the steps:
A, wavelength business is entered electrical domain crosspoint after receiver opto-electronic conversion carry out traffic grooming, be integrated into new wavelength business;
B, exchange in corresponding transmitter, carry out Wavelength matched and electro-optic conversion
C, carried out optical wavelength multiplexing by wavelength-selective switches, be sent to corresponding splitter;
D, splitter are broadcast in all wavelengths selector switch, and appointed wavelength-selective switches is selected, and be sent to corresponding output port, all the other wavelength-selective switches then abandon this wavelength business.
6. switching method according to claim 5, it is characterized in that, in described traffic grooming submodule, on user side, road port produces business of setting out on a journey, described business of setting out on a journey is in electrical domain crosspoint, carry out traffic grooming together with the wavelength business needing traffic grooming, be integrated into new wavelength business and export.
7. switching method according to claim 5, is characterized in that, in described traffic grooming submodule, under user side, road port exports lower road business, and described lower road business is exchanged in electrical domain crosspoint to be exported to lower road port.
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Application publication date: 20150826 |