CN101068129A - Method for realizing broadcasting and/or group broadcasting business in WDM-PON and system thereof - Google Patents
Method for realizing broadcasting and/or group broadcasting business in WDM-PON and system thereof Download PDFInfo
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- CN101068129A CN101068129A CN 200610061355 CN200610061355A CN101068129A CN 101068129 A CN101068129 A CN 101068129A CN 200610061355 CN200610061355 CN 200610061355 CN 200610061355 A CN200610061355 A CN 200610061355A CN 101068129 A CN101068129 A CN 101068129A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0226—Fixed carrier allocation, e.g. according to service
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
- H04J14/0228—Wavelength allocation for communications one-to-all, e.g. broadcasting wavelengths
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
- H04J14/0238—Wavelength allocation for communications one-to-many, e.g. multicasting wavelengths
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
- H04J14/0241—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths
- H04J14/0242—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON
- H04J14/0245—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON for downstream transmission, e.g. optical line terminal [OLT] to ONU
- H04J14/0246—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON for downstream transmission, e.g. optical line terminal [OLT] to ONU using one wavelength per ONU
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
- H04J14/0241—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths
- H04J14/0242—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON
- H04J14/0249—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON for upstream transmission, e.g. ONU-to-OLT or ONU-to-ONU
- H04J14/025—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON for upstream transmission, e.g. ONU-to-OLT or ONU-to-ONU using one wavelength per ONU, e.g. for transmissions from-ONU-to-OLT or from-ONU-to-ONU
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0278—WDM optical network architectures
- H04J14/0282—WDM tree architectures
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Abstract
A method for realizing broadcast and/or multicast service in WDM-PON includes transmitting data requiring to be broadcasted and/or multicasted to multiplexing-demultiplexing device after said data is modulated into wide-spectrum light generated by wide-spectrum light source, carrying out spectrum line division on wide-spectrum light carried with data requiring to be broadcasted and/or multicasted by multiplexing-demultiplexing device and transmitting light signal obtained by said division and set with different wavelength as well as carried with said data to optical network unit ONU.
Description
Technical field
The present invention relates to PON (passive optical network EPON) technical field, specifically, relate to Wave division multiplexing passive optical network WDM-PON (Wavelength-division-multiplexed passive optical network).
Background technology
At present along with the increase of user to various broadband services demands, as high-quality video information business (as VoD (Video on Demand video request program) business etc., requirement to transmission rate is more and more higher, the bandwidth demand that satisfies the user will have the message transmission rate of 100Mbps, existing dialing modem, asymmetric digital line subscribers feeder (ADSL), cable modem access waies such as (CM) can't meet the demands, therefore, demand with the optical fibre installation Access Network increases rapidly, and EPON can satisfy these new business demands and economic again just, operation maintenance is user access networks easily.
As shown in Figure 1, an EPON (PON) generally includes OLT (the opitcalline terminal that is positioned at the central office, optical line terminal), optical distribution network (ODN, optical distribution network) and many ONU (optical network unit optical network unit) or ONT (Optical NetworkTermination, for convenience of explanation, the hereinafter unified ONU that uses).Wherein, OLT provides the optical interface with ODN, and the interface of network side is provided, the interconnection ability is provided between the network side of the ODN of OLT side and OLT, finish and ONU between two-way service delivery, OLT can with the local switch ground that coexists, also can be installed in far-end; ONU provides the optical interface with ODN, realizes the interface function of ODN user side, finish and OLT between two-way service delivery, it can be placed on the user location.ODN provides transmission path for service delivery two-way between OLT and the ONU.
WDM-PON is one of implementation of PON, the basic principle of WDM-PON be OLT with ONU between constitute different passages by the different wave length light signal; At down direction, these light signals are multiplexed into a mixed signal and are transferred to the far-end node, demultiplex into each independent light signal and are transferred to different ONU at far-end node place, thereby finish the transmission of downlink data; At up direction, on the far-end node, the light signal from each ONU is multiplexed into a mixed signal, and is transferred to OLT, finish the demultiplexing and the data of mixed signal by OLT and recover, thereby finish up transfer of data.
Along with the reduction of WDM-PON network equipment complexity and cost, the realization framework of a large amount of WDM-PON has appearred at present.But WDM-PON is a kind of point-to-point network configuration in logic, and point-to-point network configuration, when realizing broadcasting (analog or digital TV), multicast service, generally adopt the interior multicopy mode of band of data to transmit, the defective of this transmission means is clearly: when the same program of many user's program requests, because a piece of data will copy into many parts and also arrive each user by different wavelength transmission respectively, require OLT that very strong disposal ability is arranged, this will make OLT become complicated, and cost rises.
Address this problem different technical schemes in the prior art, one of them as shown in Figure 2, utilize FSR (free spectrumrange, the free spectral range) characteristic of AWG (Arrayed Waveguide Grating, array waveguide grating) to come transport multicast effectively.This scheme at first utilizes the laser of n fixed wave length to produce the laser that wavelength is respectively FSR+ λ 1 to FSR+ λ n, by coupler synthetic one of a said n laser is mixed unmodulated laser then, with an external modulator multicast packet is modulated in the laser that above-mentioned wavelength is respectively FSR+ λ 1 to FSR+ λ n once again, also the n of an above-mentioned bear multicast data laser is divided into n part by light amplification again with a splitter, and be mixed into a signal with the light signal of the descending unicast data that has carried each user, be input to each input of AWG of the N:N of the first order.
After the wavelength route through first order AWG and second level AWG, final each ONU receives the light signal of the descending unicast data that carries this ONU and has carried the light signal of multicast packet, thick wavelength-division, PD (PhotoDiode by ONU inside, photodiode) and demodulation module, final ONU will recover user's unicast data and multicast packet, and be transmitted to the relevant device processing.
Though this scheme can overcome the deficiency when multicopy is realized multicast in the band well, because that used expensive laser in this scheme and two-stage AWG cause cost very high, system is very complicated.
Two of the scheme of prior art is with an independent wavelength transmission broadcast data, utilizes an independent wavelength X
ACome transportation simulator TV and digital television signal, broadcast singal was carried on the WDM-PON network of telecom operators before this, and at O/E (opto-electronic conversion) afterwards, utilize the cable television network of broadcasting and TV to carry again, this scheme can solve the broadcast issue among the WDM-PON, systematic comparison is simple, and cost is also relatively low.
But two networks (the WDM-PON network of telecom operators and the cable television network of broadcasting and TV) have been passed through in the transmission of this scheme broadcasting, and these two operators that network home is different, owing to have the conflict of interest between the operator, this will increase the enforcement difficulty of Triple-Play among the WDM-PON (data, language list and the unification of video triple play service) greatly.
In addition, according to established family digital wired broadcasting standard, to carry analog-and digital-broadcast singal simultaneously, the bandwidth that probably needs 850M, and the cable of having disposed in the present family can carry the maximum bandwidth of broadcasting service probably about 550M, if adopt this scheme, need transform the cable net of having disposed, this also is the limitation place that this scheme is used.
Three of the scheme of prior art adopts each user that an independent broadcasting wave length is arranged, each ONU receives the light signal of two wavelength, one has carried unicast data, another has carried broadcast data, but this scheme is not utilized the periodic characteristic of the FSR of AWG, therefore the AWG that locates of far-end node (RN RemoteNode) is can port number more, and simultaneously owing to adopt almost 2 times to the laser of the fixed wave length of above-mentioned prior art scheme two, so cost is very high.
Also has scheme in the prior art with above-mentioned technical scheme two and technical scheme three both combinations, digital broadcasting-television signal and user's descending unicast data is mixed, in the light signal of user's clean culture wavelength, transmit, the analog television broadcast signal then prior art scheme two with above-mentioned is the same, in being the light signal of λ A, independent wavelength transmits, behind opto-electronic conversion O/E, be transferred to each user family with cable television network again.
This scheme adopts the mixed transport of digital broadcasting-television signal and user's descending unicast data, increased the system complexity of OLT, equally, also there is the problem of the deficiency of multicopy technology in the band in the transmission of digital broadcast television, the disposal ability of OLT will become the bottleneck of system, in addition, above-mentioned prior art scheme two existing defectives also can't be resolved in this scheme.
Summary of the invention
The object of the present invention is to provide a kind of method and system thereof that in WDM-PON, realizes broadcasting and/or multicast service, networking complexity when in existing WDM-PON, realizing broadcasting and/or multicast service, the problem that cost is too high to solve.
For achieving the above object, the present invention adopts following technical scheme:
A kind of method that realizes broadcasting and/or multicast service in WDM-PON, described method comprises the steps:
A, will need to broadcast and/or the data of multicast or signal are transferred to multiplexing and demultiplexing equipment after being modulated in the wide range light that wide spectrum light source produces;
B, described multiplexing and demultiplexing equipment carry out spectral line to the wide range light that has carried described data that need broadcasting and/or multicast or signal to be cut apart, and will cut apart the carrying that obtains described needs broadcast and/or the data of multicast or the wavelength optical signals of signal are transferred to optical network unit ONU.
Wherein also comprise before the step a:
When realizing multicast service, from downlink data packet, extract the data that need multicast.
Wherein step a specifically comprises:
A1, modulator are modulated to the described data that need broadcasting and/or multicast or signal in the wide range light that described wide spectrum light source produces, and image intensifer is transferred to described multiplexing and demultiplexing equipment after the wide range light that has carried described data that need broadcasting and/or multicast or signal is amplified.
Wherein step b specifically comprises:
B1, described multiplexing and demultiplexing equipment receive and carry out spectral line behind the described wide range light that has carried described data that need broadcasting and/or multicast or signal and cut apart, with described wide range light be divided into wavelength be respectively (FSR+ λ 1), (FSR+ λ 2) ... the light signal of (FSR+ λ n), and the light signal of each wavelength different outputs by described multiplexing and demultiplexing equipment are outputed to described ONU.
Wherein also comprise after the step b:
C, described ONU carry out opto-electronic conversion O/E after receiving the described light signal that has carried described data that need broadcasting and/or multicast or signal, demodulate data or signal then.
Wherein step c also comprises: described ONU receives the data or the signal of broadcasting and/or multicast under described OLT control.
The present invention also provides a kind of system that realizes broadcasting and/or multicast service in WDM-PON, and described system comprises:
Optical line terminal OLT is used for the data or the signal of needs broadcasting and/or multicast are modulated in the wide range light;
Multiplexer and demultiplexer, be used for that the wide range light that has carried described data that need broadcasting and/or multicast or signal is carried out spectral line and cut apart, and will cut apart the carrying that obtains described needs broadcast and/or the data of multicast or the wavelength optical signals of signal are transferred to ONU;
ONU is used for describedly needing the broadcasting and/or the data of multicast or the light signal of signal to handle to described carrying that receives.
Wherein said OLT also be used for finishing and described ONU between the transmitting-receiving of up-downgoing unicast data.
Wherein said OLT specifically comprises:
Broadcasting and/or multicast processing module are used for producing described wide range light, and are modulated to the described data that need broadcasting and/or multicast or signal in the described wide range light and are transferred to described multiplexer and demultiplexer.
Wherein said multiplexing and demultiplexing equipment is array waveguide grating AWG or waveguide grating router WGR.
The present invention also provides a kind of and has realized broadcasting and/or the OLT of multicast service, and described OLT also comprises the broadcasting processing module, is used for the data or the signal of needs broadcasting are modulated in the wide range light.
Wherein said broadcasting processing module comprises:
Wide spectrum light source is used for producing the described data of broadcasting or the wide range light of signal of needing of carrying;
Modulator is used for the described data or the signal of broadcasting of needing is modulated in the described wide range light.
Wherein said OLT is modulated to it in described wide range light after also being used for extracting the data that need multicast from downlink data packet when realizing multicast service.
The present invention overcomes the deficiencies in the prior art, utilize the FSR periodicity and the frequency spectrum of multiplexing and demultiplexing equipment to cut apart characteristic, at first produce wide range light by wide spectrum light source, then broadcasting and/or multicast packet or signal are modulated to and are transferred to multiplexing and demultiplexing equipment on the wide range light, utilizing the frequency spectrum of multiplexing and demultiplexing equipment to cut apart characteristic then cuts apart wide range light, on its each output, export the laser of narrowband of the different wave length that has carried broadcasting and/or multicast packet or signal respectively, this technical scheme has been simplified the network of WDM-PON, reduced requirement to the OLT disposal ability, the complexity and the cost thereof of WDM-PON networking have been reduced, simply, in WDM-PON, realize broadcasting and/or multicast service at low cost.
Description of drawings
Fig. 1 is PON system network architecture figure;
Fig. 2 is the system construction drawing of prior art scheme one;
Fig. 3 is the FSR periodicity principle schematic of AWG;
Fig. 4 is cut apart schematic diagram for the AWG spectral line;
Fig. 5 is the spectrum schematic diagram of wide spectrum light source 1 and wide spectrum light source 2 in the embodiment of the invention;
Fig. 6 is the WDM-PON system diagram of the described realization broadcasting service of the embodiment of the invention;
Fig. 7 is the flow chart of the described realization broadcasting service of the embodiment of the invention;
Fig. 8 is the WDM-PON system diagram of the described realization multicast service of the embodiment of the invention.
Embodiment
Basic principle of the present invention be utilize multiplexing and demultiplexing equipment FSR periodically and frequency spectrum cut apart characteristic and in WDM-PON, realize broadcasting and/or multicast service, at first produce wide range light by wide spectrum light source, then broadcasting and/or multicast packet or signal are modulated to and are transferred to multiplexing and demultiplexing equipment on the wide range light, utilizing the frequency spectrum of multiplexing and demultiplexing equipment to cut apart characteristic then cuts apart wide range light, on its each output respectively output carried broadcasting/or the wavelength of multicast packet or signal be respectively the laser of narrowband of (FSR+ λ 1)～(FSR+ λ n), carry out O/E conversion and demodulation after ONU receives.
Be elaborated below in conjunction with the drawings and specific embodiments.
Multiplexing and demultiplexing equipment can be with AWG or WGR (waveguide grating router WavelengthGrating Router), is that example describes with AWG in the embodiment of the invention.There is FSR periodic characteristic as shown in Figure 3 in AWG, when the input input wavelength of the AWG of a 1 * N is respectively N light signal of λ 1～λ n, output wavelength is λ 1 light signal on its first output, and N output output wavelength is the light signal of λ n; According to the FSR of AWG periodically, then when wavelength be the light signal of (n * FSR+ λ 1) when being input to the input of above-mentioned AWG, also will on first output of AWG, export, in like manner, the light signal of (n * FSR+ λ n) will be exported on N the output of AWG.Therefore, the wavelength that has carried broadcast singal in the embodiment of the invention is that the light signal of λ 1 and the wavelength that has carried unicast data are first output output at AWG of the light signal of FSR+ λ 1, and the wavelength that has carried broadcast singal is that the light signal of λ n and the wavelength that has carried unicast data are n the output output of the light signal of FSR+ λ n at AWG.
AWG also has the spectral line dividing function, as shown in Figure 4, wherein Fig. 4 a is illustrated in the spectrum of wide spectrum light source of input input of the AWG of a 1 * N, Fig. 4 b represents the transmission spectrum of AWG, after then this wide range light passes through cutting apart of AWG, will be on N the output of AWG respectively output center wavelength be the laser of narrowband of λ 1～λ n, Fig. 4 c and Fig. 4 d represent the spectrum exported on first output and N the output respectively.
The present invention utilizes FSR periodicity and the spectral line of above-mentioned AWG to cut apart characteristic, and the Lights section has adopted two wide spectrum light sources cheaply, is called wide spectrum light source 1 and wide spectrum light source 2.Wherein, wide spectrum light source 1 and 2 spectrogram satisfy requirement shown in Figure 5, i.e. the integral multiple of FSR at interval.
As shown in Figure 6, the whole system of the embodiment of the invention comprises: OLT, AWG (for convenience of explanation, being called the 3rd AWG herein) and several ONU.
Above-mentioned OLT mainly comprises: broadcasting processing module, downlink processing module, uplink processing module, coupler and circulator.
Wherein, the broadcasting processing module further comprises wide spectrum light source 2, image intensifer and modulator, wide spectrum light source 2 is used to produce wide range light, modulator is used for broadcast singal (analog or digital or both mixing, be modulated in the wide range light hereinafter together), image intensifer is used for modulation wide range light is later amplified, and is last, the wide range light that has carried broadcast singal outputed to an input of coupler.
Wherein, the downlink processing module further comprises: exchange processing module, wide spectrum light source 1, image intensifer, an AWG and modulator array.
When unicast data was descending, exchange processing module received the IP packet data package from upper level equipment, finished exchange according to the difference of destination address and transmitted, each user's of output descending unicast data on different port; Wide spectrum light source 1 is used to produce wide range light, and image intensifer is used for the wide range light that wide spectrum light source 1 produces is carried out power amplification; The one AWG receives the wide range light from image intensifer, and the spectral line of finishing wide range light cuts apart, and output wavelength is respectively the laser of narrowband of λ 1～λ n; Modulator array is used for each user's descending unicast data is modulated to the laser of narrowband that above-mentioned wavelength is respectively λ 1～λ n respectively; Last modulator array outputs to the light signal that has carried each user's descending unicast data each input of coupler.
Wherein, coupler is finished the wide range light that has carried broadcast singal and the synthetic mixed light of the optical multiplexed signal of the descending unicast data that has carried each user, and above-mentioned mixed light is outputed to the input of circulator.
Wherein, circulator will output to the 3rd AWG from the mixed light of the past down direction of above-mentioned coupler, and will output to the 2nd AWG from the mixed light of the past up direction of the 3rd AWG.
Wherein, uplink processing module further comprises the 2nd AWG, PD array and demodulator array.Wherein, the 2nd AWG is used for receiving from above-mentioned circulator the mixed light of up direction, and the wavelength optical signals of having carried each user's up unicast data in the mixed light is routed to different outputs respectively; The PD array is used for wavelength optical signals is finished opto-electronic conversion; The demodulator array is used for the signal of telecommunication of the up unicast data that has carried each user is finished demodulation, the reduction upstream data.
Above-mentioned the 3rd AWG has nothing in common with each other in the function of up direction and down direction, introduces respectively below:
Down direction: after receiving the mixed light of down direction from the circulator of above-mentioned OLT, the wide range light that has wherein carried broadcast singal is finished spectral line cut apart, the wavelength of the descending unicast data that carried each user is respectively λ 1～λ n light signal finishes optical routing; The result that spectral line is cut apart exports the laser of narrowband that the wavelength that has carried broadcast singal is respectively (FSR+ λ 1)～(FSR+ λ n) respectively on each output of the 3rd AWG; And the result of optical routing be on each output of the 3rd AWG respectively the output wavelength of descending unicast data that carried each user be respectively λ 1～λ n light signal; Finally on each output of the 3rd AWG, will export two light signals that carried descending unicast data and broadcast singal respectively, its wavelength interval FSR; At last, the 3rd AWG arrives each ONU to the optical signal transmission on each output respectively;
Up direction, the 3rd AWG is respectively λ 1～λ n light signal from the wavelength that each ONU receives the up unicast data that has carried each user, then wavelength is respectively the mixed light that is combined into of λ 1～λ n light signal, and is transferred to the circulator of above-mentioned OLT toward up direction.
As shown in Figure 6, be example with n ONU, ONU mainly comprises thick interleaver, O/E and demodulation module, reception and three parts of loopback modulation module, wherein:
It is that (FSR+ λ n) light signal and the wavelength that has carried this ONU user's descending unicast data are the light signal of λ n that thick interleaver is used to isolate the wavelength that has carried broadcast singal on the one hand, and output to O/E and demodulation module and reception and loopback modulation module respectively, on the other hand from receive and the carrying of loopback modulation module user's up optical transmission to the three AWG of up unicast data.
O/E and demodulation module receive the wavelength that carried broadcast singal for behind (FSR+ λ n) light signal, finish opto-electronic conversion and demodulation, recover broadcast singal.
Down direction: the wavelength that reception and loopback modulation module are finished the descending unicast data that has carried this ONU user is the opto-electronic conversion and the demodulation function of the light signal of λ n, recovers user's descending unicast data and also gives the next stage device processes.
Up direction: reception and loopback modulation module receive user's up unicast data from next stage equipment, and by RSOA (reflective semiconductor optical amplifier, semiconductor optical amplifier) or injection locking F-P LD (Fabry-Perot (FP-LD) laser) produce the up light be used to carry up unicast data, up unicast data with the user is modulated in the up light simultaneously, at last the up light of the up unicast data that has carried the user is outputed to thick interleaver.
Below specify the transmission course of broadcast singal and descending unicast data, as shown in Figure 7:
1, wide spectrum light source 2 produces the wide range light, and modulator is modulated to broadcast singal in the wide range light and an input of input coupler after image intensifer amplifies; Wide range light input the one AWG after image intensifer amplifies that wide spectrum light source 1 generation wide range light (with the integral multiple of wide spectrum light source 2 interval FSR) produces carries out spectral line to be cut apart, spectral line is cut apart the laser of narrowband that the back output wavelength is respectively λ 1～λ n, and modulator array is used for each user's descending unicast data is modulated to each input that above-mentioned wavelength is respectively the laser of narrowband of λ 1～λ n and sends into coupler respectively;
2, coupler will carry the wide range light and the synthetic mixed light of the optical multiplexed signal of the descending unicast data that has carried each user of broadcast singal, and above-mentioned mixed light be outputed to the input of circulator;
3, circulator will output to the 3rd AWG from the mixed light of the past down direction of above-mentioned coupler;
4, the 3rd AWG finishes spectral line to the wide range light that has carried broadcast singal and cuts apart, and the output wavelength that carried broadcast singal is respectively the laser of narrowband of (FSR+ λ 1)～(FSR+ λ n) respectively on its each output; The 3rd AWG is respectively λ 1～λ n light signal to the wavelength of the descending unicast data that carried each user and finishes optical routing, and the output wavelength that carried each user's descending unicast data is respectively λ 1～λ n light signal respectively on its each output; Finally on each output of the 3rd AWG, will export two light signals that carried descending unicast data and broadcast singal respectively, its wavelength interval FSR; The 3rd AWG arrives each ONU to the optical signal transmission on each output respectively;
5, the thick interleaver among the ONU is isolated the light signal that has carried the broadcast singal light signal and carried this ONU user's descending unicast data, outputs to O/E and demodulation module and reception and loopback modulation module respectively;
6, after O/E among the ONU and demodulation module receive the light signal that has carried broadcast singal, finish opto-electronic conversion and demodulation, recover broadcast singal; Receive and the loopback modulation module carries out opto-electronic conversion and demodulation to the light signal of the descending unicast data that carried this ONU user, recovery user's descending unicast data is also given the next stage device processes.
When in addition, unicast data is up:
1, ONU reception and loopback modulation module receive user's up unicast data from next stage equipment, and produce the up light that is used to carry up unicast data by RSOA or injection locking F-P LD, up unicast data with the user is modulated in the up light then, at last the up light of the up unicast data that has carried the user is outputed to thick interleaver;
2, the thick interleaver up light that will carry up unicast data is sent to the 3rd AWG, the 3rd AWG is respectively λ 1～λ n light signal from the wavelength that each ONU receives the up unicast data that has carried each user, then wavelength is respectively the mixed light that is combined into of λ 1～λ n light signal, and is transferred to the circulator of above-mentioned OLT toward up direction;
3, the 2nd AWG receives the mixed light of up direction from circulator, and the wavelength optical signals of having carried each user's up unicast data in the mixed light is routed to different outputs respectively; The PD array is input to the demodulator array after wavelength optical signals is finished opto-electronic conversion, and the demodulator array is finished demodulation to the signal of telecommunication of the up unicast data that carried each user, reduces up unicast data.
Because the transmission of broadcast singal is finished in different passages with the transmission of unicast data, and these two kinds of business might be provided by different service (content) provider, therefore four kinds of compound modes that have these two kinds of service authoritys: promptly the authority of two kinds of business does not all have, the authority that two kinds of business are arranged, the authority of having only broadcast singal has only the authority of data service.Therefore, the WDM-PON system among the present invention is except the access control that possesses normal data service, and the method that also should have the control broadcast singal to receive may further comprise the steps:
The network manager is according to the device id configuration permission template of ONU;
In the authentication registration process after ONU powers on, ONU sends the request message that receives broadcasting to OLT;
After OLT receives the request message of reception broadcasting of ONU, extract the device id of the ONU in the request message, in the authority module that indexes network manager configuration, carry out Authority Verification, send corresponding broadcasting control message (forbid or allows) to corresponding ONU according to the Authority Verification result;
After ONU receives broadcasting control message, make corresponding actions,, then start the light-receiving and the demodulator circuit of broadcast singal if allow to receive according to the control content of message, receiving broadcast signal, otherwise, close the light-receiving and the demodulator circuit of broadcast singal.
The above-mentioned WDM-PON system that is used to transmit broadcast singal can also be used to multicast data transmission, in order to solve the deficiency that adopts multicopy technical transmission multicast in the band.As shown in Figure 8, be with the difference of transmission broadcast singal, exchange processing module is except the exchange of finishing downlink data is transmitted, increased the function of from downlink data packet, extracting multicast packet, exchange processing module extract multicast packet from downlink data packet after is modulated its modulator of sending into the multicast management module, modulator is modulated to multicast packet in the wide range light of wide spectrum light source 2 generations, and is similar when method for subsequent processing is broadcasted to transmission, repeats no more.
In order to realize multicast service, OLT also should catch the request from the adding multicast group of ONU, finish the multicast agent function on the one hand, on the other hand, the authenticating result of returning according to the last layer multicast server, judge whether this ONU has this multicast group data of authority request, and send a multicast service control message to this ONU according to judged result, described ONU is according to the multicast service control message from OLT, leach the multicast group data that OLT allows its reception, and directly abandon the unallowed multicast group data of OLT.Demodulate the multicast group data of OLT permission at ONU after, will send to corresponding next stage equipment and be for further processing.
Claims (13)
1, a kind of method that realizes broadcasting and/or multicast service in WDM-PON is characterized in that described method comprises the steps:
A, will need to broadcast and/or the data of multicast or signal are transferred to multiplexing and demultiplexing equipment after being modulated in the wide range light that wide spectrum light source produces;
B, described multiplexing and demultiplexing equipment carry out spectral line to the wide range light that has carried described data that need broadcasting and/or multicast or signal to be cut apart, and will cut apart the carrying that obtains described needs broadcast and/or the data of multicast or the wavelength optical signals of signal are transferred to optical network unit ONU.
2, method according to claim 1 is characterized in that, wherein also comprises before the step a:
When realizing multicast service, from downlink data packet, extract the data that need multicast.
3, method according to claim 1 is characterized in that, wherein step a specifically comprises:
A1, modulator are modulated to the described data that need broadcasting and/or multicast or signal in the wide range light that described wide spectrum light source produces, and image intensifer is transferred to described multiplexing and demultiplexing equipment after the wide range light that has carried described data that need broadcasting and/or multicast or signal is amplified.
4, method according to claim 1 is characterized in that, wherein step b specifically comprises:
B1, described multiplexing and demultiplexing equipment receive and carry out spectral line behind the described wide range light that has carried described data that need broadcasting and/or multicast or signal and cut apart, with described wide range light be divided into wavelength be respectively (FSR+ λ 1), (FSR+ λ 2) ... the light signal of (FSR+ λ n), and the light signal of each wavelength different outputs by described multiplexing and demultiplexing equipment are outputed to described ONU.
5, according to claim 1 or 3 or 4 described methods, it is characterized in that, wherein also comprise after the step b:
C, described ONU carry out opto-electronic conversion O/E after receiving the described light signal that has carried described data that need broadcasting and/or multicast or signal, demodulate data or signal then.
6, method according to claim 5 is characterized in that, wherein step c also comprises: described ONU receives the data or the signal of broadcasting and/or multicast under described OLT control.
7, a kind of system that realizes broadcasting and/or multicast service in WDM-PON is characterized in that described system comprises:
Optical line terminal OLT is used for the data or the signal of needs broadcasting and/or multicast are modulated in the wide range light;
Multiplexer and demultiplexer, be used for that the wide range light that has carried described data that need broadcasting and/or multicast or signal is carried out spectral line and cut apart, and will cut apart the carrying that obtains described needs broadcast and/or the data of multicast or the wavelength optical signals of signal are transferred to ONU;
ONU is used for needing the broadcasting and/or the data of multicast or the light signal of signal to handle to described carrying that receives.
8, system according to claim 7 is characterized in that, described OLT also be used for finishing and described ONU between the transmitting-receiving of up-downgoing unicast data.
9, system according to claim 7 is characterized in that, described OLT specifically comprises:
Broadcasting and/or multicast processing module are used for producing described wide range light, and are modulated to the described data that need broadcasting and/or multicast or signal in the described wide range light and are transferred to described multiplexer and demultiplexer.
10, system according to claim 7 is characterized in that, described multiplexing and demultiplexing equipment is array waveguide grating AWG or waveguide grating router WGR.
11, a kind ofly realize broadcasting and/or the OLT of multicast service, it is characterized in that described OLT also comprises the broadcasting processing module, be transferred to multiplexing and demultiplexing equipment after being used for being modulated to the data of needs broadcasting or signal in the wide range light.
12, OLT according to claim 11 is characterized in that, described broadcasting processing module comprises:
Wide spectrum light source is used for producing the described data of broadcasting or the wide range light of signal of needing of carrying;
Modulator is used for the described data or the signal of broadcasting of needing is modulated in the described wide range light.
13, OLT according to claim 11 is characterized in that, described OLT is modulated to it in described wide range light after also being used for extracting the data that need multicast from downlink data packet when realizing multicast service.
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| CN 200610061355 CN101068129B (en) | 2006-06-26 | 2006-06-26 | Method for realizing group broadcasting service in WDM-PON , system thereof and OLT |
| PCT/CN2007/001688 WO2008003215A1 (en) | 2006-06-26 | 2007-05-24 | A method, system and device for realizing broadcast in wdm-pon |
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| CN 200610061355 CN101068129B (en) | 2006-06-26 | 2006-06-26 | Method for realizing group broadcasting service in WDM-PON , system thereof and OLT |
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| CN102045126A (en) * | 2011-01-10 | 2011-05-04 | 中兴通讯股份有限公司 | Wavelength division multiplexing-passive optical network (WDM-PON) system and use method thereof |
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| KR20040026177A (en) * | 2002-09-23 | 2004-03-30 | 삼성전자주식회사 | Optical subscribing network for receiving broadcasting/communication signals |
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| CN101068129B (en) | 2011-11-16 |
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