CN101047464B - Controlled multicast method and system for wave complex optical network - Google Patents
Controlled multicast method and system for wave complex optical network Download PDFInfo
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- CN101047464B CN101047464B CN2006100885640A CN200610088564A CN101047464B CN 101047464 B CN101047464 B CN 101047464B CN 2006100885640 A CN2006100885640 A CN 2006100885640A CN 200610088564 A CN200610088564 A CN 200610088564A CN 101047464 B CN101047464 B CN 101047464B
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Abstract
A controlling multicasting method used on WDM passive optical network includes receiving multicast data separated from received data stream by optical link terminal and modulating multicast data into optical signal of multicast wavelength, mixing said optical signal with optical signal of modulated single-cast wavelength then sending mixed signal to multiplexer / de-multiplexer, using single-cast data channel to control said multicast data, carrying out power-division on optical signal multicast wavelength then sending power-divided optical signal to optical network unit, separating out multicast data and processing separated out multicast data by optical network unit.
Description
Technical field
The present invention relates to the optical communication technique field, it is particularly related to Wave division multiplexing passive optical network (WDM-PON:Wavelength Division Muiplexing Passive Optical System) field, is controlled multicast method and the system of a kind of WDM-PON of being used for specifically.
Background technology
At present, the professional through-rate of many Internet respectively from 56K to several million dialing modem, asymmetric digital line subscribers feeder (ADSL:Asymmetric Digital Subscriber Line), cable modem (CM:Cable MODEM), Very-high-speed Digital Subscriber Line modes such as (VDSLVery-high-bit-rate Digital Subscriber loop) insert.But for miscellaneous service is provided, as high-quality video information business, video request program (VoD:Video on Demand) business etc., the transmission of data approximately requires to have the bandwidth of 100M, can't meet the demands with above-mentioned several access waies.
Therefore, increase rapidly with the demand of optical fibre installation Access Network, EPON (PON) can satisfy these new business demands and economy, operation maintenance user access networks easily again just, is illustrated in figure 1 as the schematic network structure of PON.As shown in the figure, an EPON comprises an optical line terminal (OLT:Optical line terminal), i.e. central office, an optical distribution network (ODN:OpticalDistribution Network) and many optical network units (ONU:Optical Network Unit).Passive optical network PON can be divided into different types according to the difference of its realization, is respectively the EPON based on asynchronous transfer mode (ATM-PON) that adopts asynchronous transfer mode (ATM:Asynchronous Transfer Mode), EPON (EPON:Ethernet Over PON) based on Ethernet, Gigabit Passive Optical Network (GPON) with gigabit speed, adopt the WDM-PON of wavelength division multiplexing and the EPON based on optical code division multiple access (OCMDA-PON) that adopts code division multiple access (CDMA:Code Division Multiple Access).
The WDM-PON system is owing to the Information Security of its huge bandwidth capacity, similarity point to-point communication causes global communication expert's extensive concern, but WDM-PON network equipment complexity, cost are very high, therefore really commercialization always.Recent years, because the development of optical communication technique, the decline of relative photo communication device price, WDM-PON becomes the focus of global communications industry again once again, many equipment vendors and communications experts are reducing WDM-PON network equipment complexity, are doing a large amount of and deep research aspect reducing cost, wherein, especially with Korea S and the U.S. for.These have researched and solved a large amount of technological difficulties, and aspect reducing cost, also obtained very big effect, all obtained huge progress as the multi-wavelength light source technology in outdoor array waveguide grating (AWG:Array Wave-guideGrating) and waveguide grating router (WGR:Wave-guide Grating Router) temperature control compensation technique, the optical line terminal OLT, the light reflection amplifying technique in the optical network unit ONU, the injection locking light source technology in the optical network unit ONU etc.
Multicast be meant that information source is sent to the all-network node with information certain determine the communication form of the point of subclass to multiple spot.Multicast protocol is divided into the group membership and concerns agreement and multicast routing protocol.IGMP (IGMP:Internet Group Management Protocol) concerns agreement for group membership commonly used; Be used to set up and safeguard group membership's relation of the router direct connection network segment.Can carry out the various broad band value-added services that comprise Streaming Media, video signal based on multicasting technology.
At present, occurred the realization framework of a large amount of WDM-PON, WDM-PON is a kind of point-to-point network configuration in essence.And point-to-point network configuration when realizing multicast service, generally adopts the interior multicopy mode of band of data to transmit.The multicopy mode is meant that optical line terminal OLT copies a multicast packet for each wavelength in the described band, and each user's data business and multicast service transmit on same wavelength.In WDM-PON, except multicopy mode in being with, other way is not arranged as yet.
Yet, the multicopy mode exists obvious defects in the band, and the disposal ability of optical line terminal OLT requires very high, when the same program of many user's program requests, optical line terminal OLT need copy a multicast packet for each wavelength, increases the weight of the burden of system greatly; The waste bandwidth resource is because a piece of data will be transmitted simultaneously at a plurality of wavelength.
Summary of the invention
The object of the present invention is to provide the multiplexing and Deplexing apparatus of a kind of WDM-PON of being used for, and utilize this device that controlled multicast method and the system of a kind of WDM-PON of being used for are provided.Wherein, adopt independently that the multicast wavelength comes multicast data transmission, solved multicast service at a specific wavelength, when WDM-PON transmits, can't be on array waveguide grating AWG the problem of transparent transmission; Solved in the band optical line terminal OLT handling property bottleneck problem during multicopy transport multicast; Saved the bandwidth of user's clean culture wavelength; And in WDM-PON, realized controlled multicast.
The invention provides a kind of controlled multicast method that is used for Wave division multiplexing passive optical network, wherein, described Wave division multiplexing passive optical network comprises optical line terminal at least, has optical distribution network and at least one optical network unit of multiplexing and demodulation multiplexer at distant-end node; Wherein, described controlled multicast method comprises step:
Optical line terminal is isolated multicast packet from the data flow that receives, and be modulated in the light signal of multicast wavelength, then be sent to multiplexing and demodulation multiplexer after the light signal of clean culture wavelength after the modulation mixes, and described multicast packet is controlled by the unicast data passage;
Multiplexing and demodulation multiplexer carries out power to the light signal of described multicast wavelength to be cut apart, and is sent to corresponding optical network unit;
Optical network unit receives light signal multiplexing and demodulation multiplexer output, isolates multicast packet, and this multicast packet is handled.
According to this method, described multicast wavelength is the specific wavelength that is independent of all clean culture wavelength, and described multicast wavelength is one or more specific wavelengths.
According to this method, described multiplexing and demodulation multiplexer carries out power to the light signal of multicast wavelength to be cut apart and is meant, the light signal of described multicast wavelength is divided into N part, makes this multiplexing and each output port demodulation multiplexer that the light signal output of this multicast wavelength all be arranged; Wherein, N is the number of clean culture wavelength, and N is an integer.
According to this method, described multiplexing and demodulation multiplexer carries out power to the light signal of multicast wavelength to be cut apart, and comprises step:
From the mixed light signal that receives, isolate the light signal of multicast wavelength and the light signal of clean culture wavelength;
The light signal of clean culture wavelength is routed to the output of the correspondence of this multiplexing and demodulation multiplexer respectively;
The light signal of multicast wavelength is divided into N part, and wherein N is the number of clean culture wavelength, is the integer of 1～n;
The light signal of described clean culture wavelength and the light signal of described multicast wavelength are exported behind the light signal of the synthetic mixing of corresponding output.
According to this method, optical line terminal is controlled multicast packet by the unicast data passage and is meant: by the unicast data passage multicast is controlled message and send to optical network unit.
According to this method, optical line terminal is controlled described multicast packet by the unicast data passage, comprises step:
Described optical line terminal is caught the request message from the adding multicast group of optical network unit;
Described optical line terminal carries out multicast agent.
According to this method, optical line terminal is controlled described multicast packet by the unicast data passage, comprises step:
Described optical line terminal is caught the request message from the adding multicast group of optical network unit;
Described optical line terminal judges whether described optical network unit has authority to add multicast, and sends multicast control message to optical network unit.
According to this method, described multicast control message is the operation management maintain message, wherein carries the multicast Media Access Control Address information of mandate.
According to this method, also comprise step:
After described optical network unit was received this operation management maintain message by the unicast data passage, the multicast Media Access Control Address information of extracting the mandate of carrying in this message also was stored in this address information in the Media Access Control Address filter store of optical network unit.
According to this method, described optical network unit is handled multicast packet, comprises step:
The light signal of the multicast wavelength that separates is carried out opto-electronic conversion, be converted to the signal of telecommunication;
With reference to the content in the Media Access Control Address filter store of this optical network unit the multicast packet that receives is handled.
According to this method, the multicast packet that receives is handled, comprise step:
Whether the Media Access Control Address of judging described multicast message is present in the Media Access Control Address filter store;
Judged result is for being then to transmit this multicast packet.
According to this method, if judged result then abandons this multicast packet for not.
The present invention also provides a kind of WDM passive optical network system, and described system comprises optical line terminal at least, has the optical distribution network of multiplexing and demodulation multiplexer, at least one optical network unit at distant-end node; Wherein,
Optical line terminal is isolated multicast packet and unicast data from the data flow that receives, and described multicast packet and unicast data is modulated to respectively in the light signal of the light signal of multicast wavelength and clean culture wavelength, be delivered to multiplexing after the mixing and demodulation multiplexer in; And multicast packet is controlled by the unicast data passage;
Multiplexing and demodulation multiplexer receives described mixed light signal and handles, and the light signal of multicast wavelength is exported on all outputs; Simultaneously, the light signal of described clean culture wavelength is carried out wavelength selectivity output, make the light signal of described clean culture wavelength in fixing output output;
Optical network unit receives the described multiplexing light signal of carrying with demodulation multiplexer, therefrom isolates described multicast packet and unicast data, after detecting respectively, this multicast packet and unicast data is handled.
Described optical line terminal comprises at least:
The downlink data separator is used for isolating multicast packet and unicast data from the data flow that receives;
The multicast modulator is used to receive the multicast packet that described downlink data separator is separated, and described multicast packet is modulated in the light signal of multicast wavelength;
The multicast laser is connected with described multicast modulator, is used to produce the light signal of multicast wavelength;
Unicast modulator is used for receiving unicast data of separating from described downlink data separator and the light signal that described unicast data is modulated to the clean culture wavelength;
The clean culture laser is connected with corresponding unicast modulator, is used to produce the light signal of clean culture wavelength;
Coupler is connected with unicast modulator with the multicast modulator, and the light signal that the light signal of described multicast wavelength and clean culture wavelength is coupled as a mixing exports to multiplexing and demodulation multiplexer;
The passive optical network protocol chip is connected with described downlink data separator, by the unicast data passage multicast packet is controlled.
Described passive optical network protocol chip also comprises an addressed memory, is used to store multicast authority, type or the multicast Media Access Control Address information of described optical network unit.
Described multiplexing and demodulation multiplexer comprises at least one input, thick interleaver, 1:N array waveguide grating, splitter and N wave multiplexer and N output; Wherein,
At least one input is used to receive the light signal that described optical line terminal is carried;
Thick interleaver is used to receive the light signal that described input is imported, and the separate optical signals of described multicast wavelength is come out to send into splitter;
The 1:N array waveguide grating is connected with thick interleaver, and the light signal of isolated N clean culture wavelength of this thick interleaver is delivered to respectively in each corresponding wave multiplexer;
Splitter is used for the optical signal power of described multicast wavelength is divided into N part, and exports in the corresponding wave multiplexer;
Wave multiplexer receives the light signal and the clean culture wavelength light signal of the multicast wavelength of described splitter and array waveguide grating conveying, and synthesizes the light signal of a mixing, by corresponding output output; Wherein, the quantity of described output is N, and N is the number of clean culture wavelength, and N is an integer.
Described thick interleaver, splitter and N wave multiplexer and described 1:N array waveguide grating are integrated.
Described optical network unit comprises thick interleaver, photodetector and passive optical network protocol chip at least; Wherein,
Thick interleaver, the light signal that is used for receiving separates, and is sent to photodetector after isolating the light signal of the light signal of multicast wavelength and clean culture wavelength;
Photodetector is used for the light signal of the multicast wavelength that receives and the light signal of clean culture wavelength are detected;
The passive optical network protocol chip is used for multicast packet and unicast data after detecting are handled.
Described passive optical network protocol chip comprises at least: clean culture processing unit, multicast filtering unit and address filtering memory; Wherein,
The clean culture processing unit is used to receive unicast data, and extracts the IGMP information in the unicast data, and the Media Access Control Address of authorizing is stored in the described address filtering memory;
The multicast filtering unit is used for receiving multicast data, and the Media Access Control Address of the multicast data message that receives and the content in the described address filtering memory are compared, and according to result relatively the multicast packet that receives is handled.
Described multicast packet the processing according to comparative result is meant: if the Media Access Control Address of the multicast data message that receives is present in the described address filtering memory, then transmit this multicast packet; Otherwise abandon this multicast packet.
Described optical line terminal and optical network unit also comprise optical circulator, are connected with thick interleaver with coupler respectively, are used to separate the up-downgoing light signal.
The present invention also provides a kind of multiplexing and Deplexing apparatus, comprise at least one input and a plurality of output, wherein, this multiplexing and Deplexing apparatus separate the light signal of the multicast wavelength that input receives with the light signal of the mixed at least one wavelength of light signal of clean culture wavelength, the light signal of isolated multicast wavelength is carried out power cut apart the back and export on all outputs; Simultaneously, the light signal of described clean culture wavelength is carried out wavelength selectivity output, make the light signal of described clean culture wavelength in fixing output output.
Described multiplexing and Deplexing apparatus will be exported on described input after the synthetic mixed signal of the wavelength optical signals that output receives.
Described multicast wavelength is the specific wavelength that is independent of all clean culture wavelength, and described multicast wavelength is one or more specific wavelengths.
Also comprise thick interleaver, 1:N array waveguide grating, splitter and N wave multiplexer; Wherein,
Thick interleaver is used to receive the light signal that described input is imported, and the separate optical signals of described multicast wavelength is come out to send into splitter;
The 1:N array waveguide grating is connected with thick interleaver, and the light signal of isolated N clean culture wavelength of this thick interleaver is delivered to respectively in each corresponding wave multiplexer;
Splitter is used for the light signal of described multicast wavelength is divided into N part, and exports in the corresponding wave multiplexer;
Wave multiplexer receives the light signal and the clean culture wavelength light signal of the multicast wavelength of described splitter and array waveguide grating conveying, and synthesizes the light signal of a mixing, by corresponding output output; Wherein, the quantity of described output is N, and N is the number of clean culture wavelength, and N is an integer.
Described thick interleaver, splitter and N wave multiplexer and described 1:N array waveguide grating are integrated.
Beneficial effect of the present invention is, has economized bandwidth because among the present invention with the method for independent wavelength transmission multicast packet, effectively avoid multicast traffic stream to have what users to watch, will copy what part; Reduced OLT and gone up the degree of loading of scheduling, avoided complicated multicasting schedule agreement, system complexity is descended; The flow of multicast traffic stream is general bigger, and priority ratio is higher, and multicast traffic stream is separated with independent wavelength transmission, can guarantee the QoS of other real time business such as VOIP better; Can guarantee the QoS of system better.
Description of drawings
Fig. 1 is the PON schematic network structure of prior art;
Fig. 2 is a multiplexing and demodulation multiplexer schematic diagram of the present invention;
Fig. 3 is the multiplexing of the embodiment of the invention and demodulation multiplexer example schematic;
Fig. 4 is a WDM-PON schematic network structure of the present invention;
Fig. 5 is an OLT structural representation of the present invention;
Fig. 6 is an ONU structural representation of the present invention;
Fig. 7 is the PON protocol chip logical schematic in the optical network unit.
Embodiment
Followingly method of the present invention is elaborated with reference to accompanying drawing.
The invention provides the multiplexing and Deplexing apparatus of a kind of WDM-PON of being used for, and utilize this device that controlled multicast method and the system of a kind of WDM-PON of being used for are provided.
Embodiment one
But the invention provides a kind of WDM-PON of being used for optical distribution network, the existing AWG function multiplexing demultiplexing device of some specific wavelength of transparent transmission again, as shown in Figure 2.
As shown in Figure 2, in the present embodiment, this multiplexing and demodulation multiplexer comprises at least one input and a plurality of output, wherein, at least one that this multiplexing and demodulation multiplexer receive input or the light signal of an above wavelength separate, and the light signal of isolated multicast wavelength is carried out power cut apart the back and export on all outputs; Simultaneously, the light signal of described clean culture wavelength is carried out wavelength selectivity output, make the light signal of described clean culture wavelength in certain output output.
In addition, this is multiplexing and demodulation multiplexer can also be exported on described input after the synthetic mixed signal of the wavelength optical signals that receives from output.
As shown in Figure 3, be the multiplexing reconciliation drop multiplexer architecture of the present invention schematic diagram, this multiplexing and demodulation multiplexer also comprises: thick interleaver, 1: N array waveguide grating (AWG), splitter and N wave multiplexer; Wherein, N represents the number of clean culture wavelength, is the integer of 1～n.
Thick interleaver is used to receive the light signal (λ that described input is imported
b, λ
m, λ
1... λ
n), with described multicast wavelength (λ
b, λ
m) separate optical signals come out to send into splitter;
1: N array waveguide grating (AWG), be connected with thick interleaver, should the isolated N of thick interleaver clean culture wavelength (λ
1... λ
n) light signal be delivered to respectively in each corresponding wave multiplexer;
Splitter is used for described multicast wavelength (λ
b, λ
m) optical signal power be divided into N part, and export in the corresponding wave multiplexer;
N wave multiplexer receives the multicast wavelength (λ that described splitter and array waveguide grating (AWG) are carried
b, λ
m) light signal and clean culture wavelength (λ
1.... λ
n) light signal, and the light signal of a synthetic mixing, by corresponding output output; Wherein, the quantity of described output is N, and N is the number of clean culture wavelength, is the integer from 1～n.
Wherein, all export multicast wavelength (λ at each output
b, λ
m) light signal, and clean culture wavelength (λ
1... λ
n) light signal only in certain output port output.
In addition, the function of described thick interleaver, splitter and N wave multiplexer can be integrated into described 1: realize together in the N array waveguide grating.
Described multicast wavelength is the specific wavelength that is independent of all clean culture wavelength, and described multicast wavelength is one or more.
Described as shown in Figure 2 multicast wavelength is 1, i.e. λ
b
As shown in Figure 3, described multicast wavelength is 2, i.e. λ
b, λ
m
Embodiment two
Utilize above-mentioned multiplexing and demodulation multiplexer, can constitute a kind of Wave division multiplexing passive optical network of supporting controlled multicasting, as shown in Figure 4.
This network comprises at least: optical line terminal OLT, have the optical distribution network of multiplexing and demodulation multiplexer, at least one optical network unit at distant-end node; Wherein, optical line terminal OLT, from the data flow that receives, isolate multicast packet and unicast data, and described multicast packet and unicast data be modulated to respectively in the light signal of the light signal of multicast wavelength and clean culture wavelength, be delivered to multiplexing after the mixing and demodulation multiplexer in; And multicast packet is controlled by the unicast data passage;
Multiplexing and demodulation multiplexer receives described mixed light signal and handles, and the light signal of multicast wavelength is exported on all outputs; Simultaneously, the light signal of described clean culture wavelength is carried out wavelength selectivity output, make the light signal of described clean culture wavelength in fixing output output;
Optical network unit receives the described multiplexing light signal of carrying with demodulation multiplexer, therefrom isolates described multicast packet and unicast data, after detecting respectively, this multicast packet and unicast data is handled.
Wherein, the multiplexing demultiplexing device of distant-end node is the multiplexing and demodulation multiplexer on the optical distribution network between optical line terminal OLT and the optical network unit ONU.
As shown in Figure 5, the optical line terminal OLT in the present embodiment comprises:
Downlink data separator (not shown) is used for isolating multicast packet and unicast data from the data flow that upper level equipment receives;
The multicast modulator is used to receive the multicast packet that described downlink data separator is separated, and described multicast packet is modulated to the multicast wavelength X
mLight signal in;
The multicast laser is connected with described multicast modulator, is used to produce the multicast wavelength X
mLight signal;
Unicast modulator is used to receive the unicast data separated from described downlink data separator and described unicast data is modulated to clean culture wavelength (λ
1... λ
n) light signal in;
The clean culture laser is connected with corresponding unicast modulator, is used to produce the light signal of clean culture wavelength;
Coupler is connected with unicast modulator with the multicast modulator, and the light signal that the light signal of described multicast wavelength and clean culture wavelength is coupled as a mixing exports to multiplexing and demodulation multiplexer;
Optical circulator A is connected with described coupler, is used to separate upward signal and downstream signal;
EPON (PON) protocol chip, promptly the logic control chip is connected with described downlink data separator, by the unicast data passage multicast packet is controlled.
Downlink data separator and PON protocol chip integrate use in the present embodiment.
Described passive optical network protocol chip also comprises an addressed memory, is writing down multicast authority, type or the multicast media access control MAC address information of each optical network unit ONU.
Wherein, OLT sends to optical network unit ONU with the content in this memory as required, and ONU decides according to the data in this memory and receives or abandon or group broadcasting program that preview is specific.
As shown in Figure 6, be that example describes with one of them optical network unit ONU in the present embodiment.At least comprise: thick interleaver, photodetector PD and EPON (PON) agreement (logic control) chip; Also comprise an optical circulator; Wherein,
Optical circulator B is connected with thick interleaver, is used to separate upward signal and downstream signal;
Thick interleaver, the light signal that is used for receiving separates, and isolates the multicast wavelength X
mLight signal and clean culture wavelength X
nLight signal after be sent to photodetector;
Photodetector is used for the multicast wavelength X to receiving
mLight signal and clean culture wavelength X
nLight signal detect, be about to the multicast wavelength X
mLight signal and clean culture wavelength X
nLight signal carry out opto-electronic conversion, be converted to the signal of telecommunication respectively; Photodetector described in the present embodiment is photodiode (PD:PhotoDiode).
EPON (PON) protocol chip, promptly the logic control chip is used for multicast packet and unicast data after detecting are handled.
In addition, also can comprise demodulator, be used for the data after the opto-electronic conversion are modulated.
As shown in Figure 7, described PON protocol chip comprises at least: clean culture processing unit, multicast filtering unit and address filtering memory; Wherein,
The clean culture processing unit receives unicast data by the unicast data passage, and extracts IGMP (IGMP) information in the unicast data, and the MAC Address of authorizing is stored in the described address filtering memory;
The multicast filtering unit, by multicast packet passage receiving multicast data, and the Media Access Control Address of the multicast data message that receives and the content in the described address filtering memory compared, according to result relatively the multicast packet that receives is handled.
Described multicast packet the processing according to comparative result is meant: if the Media Access Control Address of the multicast data message that receives is present in the described address filtering memory, then to this multicast packet of next stage device transmission; Otherwise abandon this multicast packet.
In addition, also can comprise a data output buffer unit, will cushion output then by the data of clean culture processing unit and multicast filtering unit.
Therefore, each ONU receives two or more wavelength, and as shown in Figure 6, one is λ
nTransmission general service data, λ
mMulticast data transmission.Launch a wavelength and be used for uplink communication λ
u, the uplink and downlink communication of IGMP message in the present invention utilizes λ
nAnd λ
uTwo wavelength, downlink transfer multicast packet λ
mWavelength.
Below the working condition of above-mentioned WDM-PON system is described.
Carry out information interaction between optical line terminal OLT and the optical network unit ONU; Wherein,
Optical line terminal OLT is caught the request message from the adding multicast group of optical network unit ONU, carries out multicast agent on the one hand, and this repeats no more for prior art;
In addition, optical line terminal OLT also is sent to optical network unit ONU by the unicast data passage with operation and maintenance message (OAM:Operation and Maintance), carries the mac address information of the multicast of mandate in this OAM message; After the clean culture processing unit of the PON protocol chip in the optical network unit ONU receives this OAM message, the mac address information of the multicast with mandate in this OAM message is stored in the mac address filter memory;
Describe multicast is controlled below.
Downlink data separator in the optical line terminal OLT is isolated multicast packet according to the MAC Address type from the data flow that upper level equipment receives, and is modulated in the light signal of multicast wavelength, is sent to multiplexing and demodulation multiplexer then; Multiplexing and demodulation multiplexer carries out power to the light signal of described multicast wavelength to be cut apart, and is sent to corresponding optical network unit ONU; Optical network unit receives light signal multiplexing and demodulation multiplexer output, isolate multicast packet, and this multicast packet being carried out opto-electronic conversion through photodiode PD, the multicast filtering unit of by the multicast packet passage this multicast packet being delivered in the PON protocol chip of optical network unit is handled; Mac address information in mac address information in this multicast data message and the mac address filter memory is compared, if the mac address information in this multicast data message is present in the address filtering memory, then this multicast data message is sent to next stage equipment, otherwise abandons this multicast packet.
Embodiment three
Below the controlled multicast method that is used for above-mentioned network system is elaborated.
This method comprises: optical line terminal OLT is isolated multicast packet from the data flow that receives, and be modulated in the light signal of multicast wavelength, then be sent to multiplexing and demodulation multiplexer after the light signal of clean culture wavelength after the modulation mixes, and described multicast packet is controlled by the unicast data passage;
Multiplexing and demodulation multiplexer carries out power to the light signal of described multicast wavelength to be cut apart, and is sent to corresponding optical network unit;
Optical network unit receives light signal multiplexing and demodulation multiplexer output, isolates multicast packet, and this multicast packet is handled.
In the present embodiment, described multiplexing and demodulation multiplexer carries out power to the light signal of multicast wavelength to be cut apart and is meant, the light signal of described multicast wavelength is divided into N part, makes this multiplexing and each output port demodulation multiplexer that the light signal output of this multicast wavelength all be arranged; Wherein, N is the number of clean culture wavelength.
In the present embodiment, described multiplexing and demodulation multiplexer carries out power to the light signal of multicast wavelength to be cut apart, and concrete segmentation procedure as shown in Figure 6.
Thick interleaver receives the light signal (λ of described input input
b, λ
m, λ
1... λ
n), with described multicast wavelength (λ
b, λ
m) separate optical signals come out to send into splitter;
1: N array waveguide grating (AWG), should the isolated N of thick interleaver clean culture wavelength (λ
1... λ
n) light signal be delivered to respectively in each corresponding wave multiplexer;
Splitter is used for described multicast wavelength (λ
b, λ
m) optical signal power be divided into N part, and export in the corresponding wave multiplexer;
N wave multiplexer receives the multicast wavelength (λ that described splitter and array waveguide grating (AWG) are carried
b, λ
m) light signal and clean culture wavelength (λ
1... λ
n) light signal, and the light signal of a synthetic mixing, by corresponding output output; Wherein, the quantity of described output is N, and N is the number of clean culture wavelength, is the integer from 1～n.
Wherein, all export multicast wavelength (λ at each output
b, λ
m) light signal, and clean culture wavelength (λ
1... λ
n) light signal only in certain output port output.In the present embodiment, optical line terminal OLT is controlled described multicast packet by the unicast data passage, comprises step:
Described optical line terminal OLT is caught the request message from the adding multicast group of optical network unit ONU;
Described optical line terminal carries out multicast agent.
In addition, in the present embodiment, optical line terminal OLT is controlled described multicast packet by the unicast data passage, comprises step:
Described optical line terminal OLT is caught the request message from the adding multicast group of optical network unit ONU;
Described Optical Network Terminal OLT judges whether described optical network unit ONU has authority to add multicast, and by operation management maintain (OAM:Operation Administrator maintenance) message the multicast mac address that this ONU has authority is sent to optical network unit ONU.Wherein, in the present embodiment, described multicast control message is operation and maintenance (OAM:Operation Administratormaintenance) message.
As shown in Figure 4, in the present embodiment, downlink data separator (not shown) from the data flow from upper level equipment, extracts multicast packet wherein according to the MAC Address type, and then all multicast packets being modulated to wavelength is λ
mLight signal in go, carry out power through optical distribution network then and cut apart the back and arrive on each ONU;
Meanwhile, OLT must catch the request from the adding multicast group of ONU, carries out multicast agent on the one hand; On the other hand, according to certain strategy, judge whether ONU has authority to add certain multicast, and the OAM message that sends the multicast mac address information carry mandate is to ONU, it is λ that ONU leaches wavelength according to the MAC Address of OAM indication
mCorresponding group broadcasting program data in the light signal, and directly abandon other group broadcasting program data that non-OLT allows.
After ONU demodulates the group broadcasting program data of permission, give corresponding apparatus and handle.Can adopt this measure to realize controlled watching equally to cable TV (CATV) signal.
The foregoing description only is used to illustrate the present invention, but not is used to limit the present invention.
Claims (26)
1. a controlled multicast method that is used for Wave division multiplexing passive optical network is characterized in that, described Wave division multiplexing passive optical network comprises optical line terminal at least, has optical distribution network and at least one optical network unit of multiplexing and demodulation multiplexer at distant-end node; Wherein, described controlled multicast method comprises step:
Optical line terminal is isolated multicast packet from the data flow that receives, and be modulated in the light signal of multicast wavelength, then be sent to multiplexing and demodulation multiplexer after the light signal of clean culture wavelength after the modulation mixes, and described multicast packet is controlled by the unicast data passage;
Multiplexing and demodulation multiplexer carries out power to the light signal of described multicast wavelength to be cut apart, and is sent to corresponding optical network unit;
Optical network unit receives light signal multiplexing and demodulation multiplexer output, isolates multicast packet, and this multicast packet is handled.
2. the controlled multicast method that is used for Wave division multiplexing passive optical network according to claim 1 is characterized in that, described multicast wavelength is the specific wavelength that is independent of all clean culture wavelength, and described multicast wavelength is one or more specific wavelengths.
3. the controlled multicast method that is used for Wave division multiplexing passive optical network according to claim 1, it is characterized in that, described multiplexing and demodulation multiplexer carries out power to the light signal of multicast wavelength to be cut apart and is meant, the light signal of described multicast wavelength is divided into N part, makes this multiplexing and each output port demodulation multiplexer that the light signal output of this multicast wavelength all be arranged; Wherein, N is the number of clean culture wavelength, and N is an integer.
4. the controlled multicast method that is used for Wave division multiplexing passive optical network according to claim 3 is characterized in that, described multiplexing and demodulation multiplexer carries out power to the light signal of multicast wavelength to be cut apart, and comprises step:
From the mixed light signal that receives, isolate the light signal of multicast wavelength and the light signal of clean culture wavelength;
The light signal of clean culture wavelength is routed to the output of the correspondence of this multiplexing and demodulation multiplexer respectively;
The light signal of multicast wavelength is divided into N part, and wherein N is the number of clean culture wavelength, and N is an integer;
The light signal of described clean culture wavelength and the light signal of described multicast wavelength are exported behind the light signal of the synthetic mixing of corresponding output.
5. the controlled multicast method that is used for Wave division multiplexing passive optical network according to claim 1, it is characterized in that optical line terminal is controlled multicast packet by the unicast data passage and is meant: by the unicast data passage multicast is controlled message and send to optical network unit.
6. the controlled multicast method that is used for Wave division multiplexing passive optical network according to claim 1 is characterized in that, optical line terminal is controlled described multicast packet by the unicast data passage, comprises step:
Described optical line terminal is caught the request message from the adding multicast group of optical network unit;
Described optical line terminal carries out multicast agent.
7. the controlled multicast method that is used for Wave division multiplexing passive optical network according to claim 1 is characterized in that, optical line terminal is controlled described multicast packet by the unicast data passage, comprises step:
Described optical line terminal is caught the request message from the adding multicast group of optical network unit;
Described optical line terminal judges whether described optical network unit has authority to add multicast, and sends multicast control message to optical network unit.
8. the controlled multicast method that is used for Wave division multiplexing passive optical network according to claim 7 is characterized in that, described multicast control message is the operation management maintain message, wherein carries the multicast Media Access Control Address information of mandate.
9. the controlled multicast method that is used for Wave division multiplexing passive optical network according to claim 8 is characterized in that, also comprises step:
After described optical network unit was received this operation management maintain message by the unicast data passage, the multicast Media Access Control Address information of extracting the mandate of carrying in this message also was stored in this address information in the Media Access Control Address filter store of optical network unit.
10. the controlled multicast method that is used for Wave division multiplexing passive optical network according to claim 1 is characterized in that, described optical network unit is handled multicast packet, comprises step:
The light signal of the multicast wavelength that separates is carried out opto-electronic conversion, be converted to the signal of telecommunication;
With reference to the content in the Media Access Control Address filter store of this optical network unit the multicast packet that receives is handled.
11. the controlled multicast method that is used for Wave division multiplexing passive optical network according to claim 10 is characterized in that, the multicast packet that receives is handled, and comprises step:
Whether the Media Access Control Address of judging described multicast data message is present in the Media Access Control Address filter store;
Judged result is for being then to transmit this multicast packet.
12. the controlled multicast method that is used for Wave division multiplexing passive optical network according to claim 11 is characterized in that, if judged result then abandons this multicast packet for not.
13. a WDM passive optical network system is characterized in that, described system comprises optical line terminal at least, has the optical distribution network of multiplexing and demodulation multiplexer, at least one optical network unit at distant-end node; Wherein,
Optical line terminal is isolated multicast packet and unicast data from the data flow that receives, and described multicast packet and unicast data is modulated to respectively in the light signal of the light signal of multicast wavelength and clean culture wavelength, be delivered to multiplexing after the mixing and demodulation multiplexer in; And multicast packet is controlled by the unicast data passage;
Multiplexing and demodulation multiplexer receives described mixed light signal and handles, and the light signal of multicast wavelength is exported on all outputs; Simultaneously, the light signal of described clean culture wavelength is carried out wavelength selectivity output, make the light signal of described clean culture wavelength in fixing output output;
Optical network unit receives the described multiplexing light signal of carrying with demodulation multiplexer, therefrom isolates described multicast packet and unicast data, after detecting respectively, this multicast packet and unicast data is handled.
14. WDM passive optical network system according to claim 13 is characterized in that, described optical line terminal comprises at least:
The downlink data separator is used for isolating multicast packet and unicast data from the data flow that receives;
The multicast modulator is used to receive the multicast packet that described downlink data separator is separated, and described multicast packet is modulated in the light signal of multicast wavelength;
The multicast laser is connected with described multicast modulator, is used to produce the light signal of multicast wavelength;
Unicast modulator is used for receiving unicast data of separating from described downlink data separator and the light signal that described unicast data is modulated to the clean culture wavelength;
The clean culture laser is connected with corresponding unicast modulator, is used to produce the light signal of clean culture wavelength;
Coupler is connected with unicast modulator with the multicast modulator, and the light signal that the light signal of described multicast wavelength and clean culture wavelength is coupled as a mixing exports to multiplexing and demodulation multiplexer;
The passive optical network protocol chip is connected with described downlink data separator, by the unicast data passage multicast packet is controlled.
15. WDM passive optical network system according to claim 14, it is characterized in that, described passive optical network protocol chip also comprises an addressed memory, is used to store multicast authority, type or the multicast Media Access Control Address information of described optical network unit.
16. WDM passive optical network system according to claim 14 is characterized in that, described multiplexing and demodulation multiplexer comprises at least one input, thick interleaver, 1:N array waveguide grating, splitter and N wave multiplexer and N output; Wherein,
At least one input is used to receive the light signal that described optical line terminal is carried;
Thick interleaver is used to receive the light signal that described input is imported, and the separate optical signals of described multicast wavelength is come out to send into splitter;
The 1:N array waveguide grating is connected with thick interleaver, and the light signal of isolated N clean culture wavelength of this thick interleaver is delivered to respectively in each corresponding wave multiplexer;
Splitter is used for the optical signal power of described multicast wavelength is divided into N part, and exports in the corresponding wave multiplexer;
Wave multiplexer receives the light signal and the clean culture wavelength light signal of the multicast wavelength of described splitter and array waveguide grating conveying, and synthesizes the light signal of a mixing, by corresponding output output; Wherein, the quantity of described output is N, and N is the number of clean culture wavelength, and N is an integer.
17. WDM passive optical network system according to claim 16 is characterized in that, described thick interleaver, splitter and N wave multiplexer and described 1:N array waveguide grating are integrated.
18. WDM passive optical network system according to claim 14 is characterized in that, described optical network unit comprises thick interleaver, photodetector and passive optical network protocol chip at least; Wherein,
Thick interleaver, the light signal that is used for receiving separates, and is sent to photodetector after isolating the light signal of the light signal of multicast wavelength and clean culture wavelength;
Photodetector is used for the light signal of the multicast wavelength that receives and the light signal of clean culture wavelength are detected;
The passive optical network protocol chip is used for multicast packet and unicast data after detecting are handled.
19. WDM passive optical network system according to claim 18 is characterized in that, described passive optical network protocol chip comprises at least: clean culture processing unit, multicast filtering unit and address filtering memory; Wherein,
The clean culture processing unit is used to receive unicast data, and extracts the IGMP information in the unicast data, and the Media Access Control Address of authorizing is stored in the described address filtering memory;
The multicast filtering unit is used for receiving multicast data, and the Media Access Control Address of the multicast data message that receives and the content in the described address filtering memory are compared, and according to result relatively the multicast packet that receives is handled.
20. WDM passive optical network system according to claim 19, it is characterized in that, described multicast packet the processing according to comparative result is meant: if the Media Access Control Address of the multicast data message that receives is present in the described address filtering memory, then transmit this multicast packet; Otherwise abandon this multicast packet.
21., it is characterized in that described optical line terminal and optical network unit also comprise optical circulator according to claim 14 or 18 described WDM passive optical network systems, be connected with thick interleaver with coupler respectively, be used to separate the up-downgoing light signal.
22. multiplexing and Deplexing apparatus, comprise at least one input and a plurality of output, it is characterized in that, this multiplexing and Deplexing apparatus separate the light signal of the multicast wavelength that input receives with the light signal of the mixed at least one wavelength of light signal of clean culture wavelength, the light signal of isolated multicast wavelength is carried out power cut apart the back and export on all outputs; Simultaneously, the light signal of described clean culture wavelength is carried out wavelength selectivity output, make the light signal of described clean culture wavelength in fixing output output.
23. multiplexing and Deplexing apparatus according to claim 22 is characterized in that, described multiplexing and Deplexing apparatus will be exported on described input after the synthetic mixed signal of the wavelength optical signals that output receives.
24., it is characterized in that described multicast wavelength is the specific wavelength that is independent of all clean culture wavelength, and described multicast wavelength is one or more specific wavelengths according to claim 22 or 23 described multiplexing and Deplexing apparatus.
25. according to claim 22 or 23 described multiplexing and Deplexing apparatus, it is characterized in that, also comprise thick interleaver, 1:N array waveguide grating, splitter and N wave multiplexer; Wherein,
Thick interleaver is used to receive the light signal that described input is imported, and the separate optical signals of described multicast wavelength is come out to send into splitter;
The 1:N array waveguide grating is connected with thick interleaver, and the light signal of isolated N clean culture wavelength of this thick interleaver is delivered to respectively in each corresponding wave multiplexer;
Splitter is used for the light signal of described multicast wavelength is divided into N part, and exports in the corresponding wave multiplexer;
Wave multiplexer receives the light signal and the clean culture wavelength light signal of the multicast wavelength of described splitter and array waveguide grating conveying, and synthesizes the light signal of a mixing, by corresponding output output; Wherein, the quantity of described output is N, and N is the number of clean culture wavelength, and N is an integer.
26. multiplexing and Deplexing apparatus according to claim 25 is characterized in that, described thick interleaver, splitter and N wave multiplexer and described 1:N array waveguide grating are integrated.
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