CN103402147B - The OFDMA metropolitan area access UNE of compatible OVPN communication and communication means - Google Patents
The OFDMA metropolitan area access UNE of compatible OVPN communication and communication means Download PDFInfo
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- CN103402147B CN103402147B CN201310325487.6A CN201310325487A CN103402147B CN 103402147 B CN103402147 B CN 103402147B CN 201310325487 A CN201310325487 A CN 201310325487A CN 103402147 B CN103402147 B CN 103402147B
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Abstract
The invention discloses a kind of OFDMA metropolitan area access UNE and communication means of compatible OVPN communication, OVPN communication includes outside OVPN communication and communicates with inner OVPN; In central office, realized control and the distribution of OVPN light source by M × M optical switch; Do you in distant-end node, adopt OVPN? OFDM transmitter and receiver realize generation and the reception of OVPN signal respectively; Centroid dynamically receives from the outside OVPN signal in fiber optic loop according to network OVPN signal intelligence, and the OVPN signal of needs is broadcast to all distant-end nodes of subordinate, and judge it is broadcast in optical fibre tree inside or mail to other Centroids by fiber optic loop according to the OVPN signal type that distant-end node is uploaded.Distribute and OVPN connection setup Demolition Scheme according to the network bandwidth resources proposed, adopt network configuration of the present invention, many OVPN can be realized in OFDMA metropolitan area access UNE and communicate simultaneously, meet the OVPN demand of user.
Description
Technical field
The invention belongs to technical field of photo communication, more specifically say, relate to a kind of OFDMA metropolitan area access UNE and communication means of compatible OVPN communication.
Background technology
In recent years, along with enriching constantly of user's access service, the continuous increase of service traffics, Large Copacity and high broadband have become the Main way of network Development.Current network, backbone capacity is along with high density WDM(Wavelength-divisionmultiplexing, wavelength division multiplexing) development of technology expanded several magnitude, user side local area network (LAN) speed is also because a large step in the appearance of low cost gigabit Ethernet and development, but for Metro access networks, its transmission rate becomes the bottleneck of expansion the whole network bandwidth.Meanwhile, at OFC(OpticalFiberCommunicationConference in 2012, international optical communication meeting) in meeting, the result of study that foreign scholar announces shows, core net, metropolitan area network and Access Network energy consumption account for 19%, 14% and 67% of communication network total energy consumption respectively.Therefore, the problem that Novel connecting networks has become one of emphasis of present stage network research.Meanwhile, in Novel connecting networks, the emphasis that OVPN network OVPN communication also becomes research is realized.
At present, the main direction of studying of OVPN network OVPN comprises based on passive optical network PON (PassiveOpticalNetwork, passive optical-fiber network) OVPN(OpticalVirtualPrivateNetwork, OVPN) research and based on metropolitan area access UNE OVPN network research etc.For different access waies, the OVPN research based on PON is mainly divided into again the research based on time-multiplexed OVPN, based on the research of the research of the OVPN of wavelength division multiplexing and the OVPN based on orthogonal frequency division multiplex OFDM A; OVPN network research based on metropolitan area access UNE mainly comprises the research of the OVPN based on wavelength division multiplexing.
In the scheme that existing OVPN communicates, such as at document 13.Y.Tian, Q.Chang, andY.Su, " Atwo-stagemetro-accessintegratednetworkenablingall-optic alvirtualprivatenetwork, " IEEEOECC, 1-2 (2008). in, author proposes based on TDM(Time-DivisionMultiplexing, time division multiplexing) implementation method of the OVPN of the Metro access networks of/WDM.But, because this UNE adopts DPSK and ASK modulation technique, make network data transmission rate limited.In order to improve OVPN traffic rate further, sight is focused on OFDM(OrthogonalFrequencyDivisionMultiplexing by domestic and international many scholars, i.e. orthogonal frequency division multiplexi) in modulation, utilize OFDM multi-carrier modulation characteristic and its to the robustness of fiber channel dispersion, realize the optical signal transmission of more than 10Gbps with less cost.Such as, at document D.Lei, Z.Ying, P.Xiaodan, Y.Xianbin, L.Deming, andT.M.Idelfonso, " Intraandinter-PONONUtoONUvirtualprivatenetworkingusingOF DMAinaringtopology, " inProc.IEEEMWP (2011). in, author utilizes virtual tree-like PON structure, transmits ofdm signal and carry out OVPN communication in the middle of PON system; At document 15.C.F.Zhang, J.Huang, C.Chen, andK.Qiu, " All-opticalvirtualprivatenetworkandONUscommunicationinop ticalOFDM-basedPONsystem; " Opt.Express19 (24), 24816-24821 (2011). in, author utilizes OFDMA(OrthogonalFrequencyDivisionMultipleAccess, orthogonal frequency-time multiple access) sub carries allocation technology in PON system, carry out OVPN communication.
But in the middle of current OVPN network research, the research that net OVPN communication is merged in the metropolitan area access based on OFDMA is also in blind spot.In order to the demand that satisfied access fusion network users in metropolitan area of future generation communicates to OVPN, need the OFDMA metropolitan area access UNE framework proposing to support OVPN to communicate.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, a kind of OFDMA metropolitan area access UNE and communication means of compatible OVPN communication are provided, OVPN is realized based on OFDMA metropolitan area access UNE, make OVPN have higher extensibility, flexibility, ensure the characteristic of low cost of whole metropolitan area access UNE simultaneously.
For achieving the above object, the OVPN system of access UNE in OFDMA metropolitan area of the present invention, is characterized in that comprising:
Described central office comprises descending light source generator, descending ofdm signal transmitter, OVPN light source generator, M × M optical switch, the second array waveguide grating, central office's fiber amplifier, the first optical filter, optical comb filter, the first coupler, the 3rd array waveguide grating, upgoing O FDM signal receiver, wherein:
Descending light source generator, for generation of line light source under multichannel, sends to descending ofdm signal transmitter;
Descending ofdm signal transmitter, for the light OFDM modulation utilizing lower line light source to carry out downstream signal, sends to the second array waveguide grating by modulating the multichannel downstream signal obtained;
OVPN light source generator, for generation of n OVPN light source, send to M × M optical switch, wherein n is less than or equal to the quantity of optical switch in M × M optical switch;
One M × M optical switch, optical switch quantity is M
1, for the break-make of control OVPN light source, the OVPN light source passed through sends to the second array waveguide grating;
Second array waveguide grating, for merging by all downstream signals with by the OVPN light source of M × M optical switch, sends to the first coupler;
Central office's fiber amplifier, amplifies for central office is received from fiber optic loop the Received signal strength obtained, sends to the first optical filter;
First optical filter, for being separated with upward signal by the outside OVPN signal in Received signal strength, sending to optical comb filter by outside OPVN signal, upward signal being sent to the 3rd array waveguide grating;
Optical comb filter, for by the light carrier filtering in the single-side belt ofdm signal of all outside OVPN channel transfer, obtains filtered outside OVPN signal, sends to the first coupler;
First coupler, for the downstream signal that merged by the second array waveguide grating and OVPN light source, and to be merged by the filtered outside OVPN signal of optical comb filter, is sent to fiber optic loop;
3rd array waveguide grating, for by upward signal demultiplexing, sends to upgoing O FDM signal receiver;
Upgoing O FDM signal receiver, to go forward side by side row relax for receiving upward signal;
Described Centroid comprises the first fiber amplifier, beam splitter, a path filter, b road array waveguide grating, the 2nd M × M optical switch, up light source generator, the second fiber amplifier, the second optical filter, the second coupler, the 3rd coupler, wherein:
First fiber amplifier, for being amplified by the Received signal strength received from fiber optic loop and sending to beam splitter, Received signal strength comprises upward signal, downstream signal, outside OVPN signal and OVPN light source;
Beam splitter, for being divided into the identical signal of two-way by the Received signal strength amplified through the first fiber amplifier: a road signal and b road signal, send to a path filter and b road array waveguide grating respectively;
A path filter, parameter is arranged according to the total bandwidth of all available Foreign OVPN channel occupancies that place optical fibre tree is assigned to, for the outside OVPN signal that this optical fibre tree of filtering last time produces, obtain upward signal, downstream signal, OVPN light source and the outside OVPN signal from other optical fibre trees after filtering, and filtered a road signal is sent to the 3rd coupler;
B road array waveguide grating, for b road signal is carried out demultiplexing, obtain downstream signal, upward signal, outside OPVN signal and OVPN light source, wherein upward signal directly abandons, downstream signal sends to the second coupler, and outside OVPN signal and OVPN light source send to the 2nd M × M optical switch;
2nd M × M optical switch, optical switch quantity is M
2, and M
2>=M
1, pass through for the outside OVPN signal and OVPN light source being controlled correspondence by closed and disconnected optical switch, the outside OVPN signal passed through and OVPN light source are sent to the second coupler;
Up light source generator, for generation of the upper line light source needed for upward signal modulation, sends to the second coupler;
Second fiber amplifier, for amplifying the signal from distant-end nodes all in this optical fibre tree and sending to the second optical filter, the signal from all distant-end nodes comprises inner OVPN signal, outside OVPN signal and upward signal;
Second optical filter, the bandwidth of parameter shared by internal system OVPN channel is arranged, signal for being sent by distant-end node is divided into inner OVPN signal and other signals, send to the second coupler and the 3rd coupler respectively, other signals comprise the outside OVPN signal and upward signal that in this optical fibre tree, all distant-end nodes generate;
Second coupler, for the downstream signal will obtained from b road array waveguide grating, outside OPVN signal and OVPN light source, the upper line light source that up light source generator produces and the inside OVPN signal that the second optical filter obtains merge, and then send to all remote subscribers of this optical fibre tree;
3rd coupler, for upward signal, downstream signal and the outside OVPN signal from other optical fibre trees that a road signal is obtained after a path filter, and the upward signal that generates of this optical fibre tree to obtain through the second optical filter and outside OVPN signal merge, be sent to fiber optic loop;
Described distant-end node comprises descending ofdm signal receiver, upgoing O FDM signal transmitter, OVPNOFDM signal receiver, OVPNOFDM signal transmitter, the 3rd optical filter, distant-end node fiber amplifier, wherein:
Distant-end node fiber amplifier, for by distant-end node from correspondence all signals of receiving of Centroid amplify after send to the 3rd optical filter, the Received signal strength of distant-end node comprises downstream signal, outside OPVN signal, OVPN light source, upper line light source and inner OVPN signal;
3rd optical filter, for by downstream signal, outside OPVN signal, OVPN light source, upper line light source and inner OVPN Signal separator, OVPN light source is sent to OVPNOFDM signal transmitter, outside OVPN signal and inner OVPN signal are sent to OVPNOFDM signal receiver, upper line light source is sent to upgoing O FDM signal transmitter, downstream signal is sent to descending ofdm signal receiver; The upward signal that the OVPN signal produce OVPNOFDM signal transmitter and upgoing O FDM signal transmitter produce merges, and then sends to corresponding Centroid;
OVPNOFDM signal transmitter, carries out OVPN signal madulation for the OVPN light source utilizing OVPN belonging to distant-end node corresponding, OVPN signal is sent to the 3rd optical filter;
OVPNOFDM signal receiver, for carrying out data demodulates and process by the outside OVPN signal received or inner OVPN signal;
Upgoing O FDM signal transmitter, for utilizing upper line light source to carry out upward signal modulation, sends to the 3rd optical filter by upward signal;
Descending ofdm signal receiver, for carrying out data demodulates and process to downstream signal.
The OFDMA metropolitan area access UNE communication means that the present invention also provides a kind of OFDMA metropolitan area communicated based on compatible OVPN to access UNE, is characterized in that comprising the following steps:
S1: network bandwidth resources is distributed and system configuration: available bandwidth is divided into four parts: upstream bandwidth, downlink bandwidth, the inner OVPN bandwidth of outside OVPN bandwidth sum, this frequency band shared by four fractional bandwidth is divided into again multiple subbands not overlapping mutually separately, respectively as up channel, down channel, outside OVPN channel and inner OVPN channel, communicate with inner OVPN for uplink communication, downlink communication, outside OVPN communication; All inner OVPN channels are assigned to each optical fibre tree as its useable internal OVPN channel; All outside OVPN channels are divided into m part, and each part comprises multiple continuous print channel, and m is the number of optical fibre tree in system, and the channel of this m part is distributed to m optical fibre tree respectively as its available Foreign OVPN channel;
Central office is provided with optical switch and sends to control OVPN light source, and each Centroid is respectively arranged with optical switch to the reception of control OVPN light source and outside OVPN signal, and in Centroid, optical switch quantity is more than or equal to optical switch quantity in central office;
S2: when several distant-end nodes need to set up an OVPN communicate time, all distant-end nodes utilize uplink communication to send OVPN to central office and set up application message, central office receives OVPN and sets up application message, for the optical fibre tree belonging to this OVPN distributes the OVPN channel within the scope of OVPN light source and corresponding available bandwidth, different OVPN distributes different OVPN light sources and channel: for optical fibre tree inside OVPN, and central office is that optical fibre tree distributes an available inside OVPN light source and corresponding inside OVPN channel; For outside OVPN, central office is that in outside OVPN, each optical fibre tree distributes an available outside OVPN light source and corresponding OVPN channel;
S3: OVPN light source information and OVPN channel information are sent to Centroid and the distant-end node of corresponding OVPN subordinate by downlink communication by central office, central office and corresponding Centroid close its corresponding OVPN switch, OVPN light source is sent in fiber optic loop by central office, received by the Centroid in the optical fibre tree of corresponding OVPN subordinate and be forwarded to distant-end node, under each OVPN, the multiple distant-end nodes belonged in same optical fibre tree share this OVPN light source be assigned to and corresponding OVPN channel;
S4: distant-end node utilizes the OVPN light source and OVPN channel that are fitted on from center score of the game, carry out light OFDM modulation and obtain OVPN signal, and the upper line light source utilizing Centroid to send carries out light OFDM modulation obtains upward signal, OVPN signal is sent to together with upward signal corresponding Centroid;
S5: Centroid receives from the OVPN signal of all distant-end nodes and upward signal, utilize filter that inner OVPN Signal separator is out sent it back distant-end node, remaining distant-end node upward signal and outside OVPN signal are then sent in fiber optic loop and transmit;
Centroid receives the mixed signal from the upward signal in fiber optic loop, downstream signal, outside OVPN signal and OVPN light source simultaneously, and the outside OVPN signal wherein received comprises the outside OVPN signal that in network, all optical fibre trees send; First mixed signal is divided into two-way by Centroid, the outside OVPN signal that one road signal is sent by this optical fibre tree before utilizing in the outside OVPN signal of filter filtering, is sent to fiber optic loop together with the upward signal then outside OVPN signal and this optical fibre tree of the upward signal obtained after filtering, downstream signal, other optical fibre trees generated, outside OVPN signal;
Another road signal is sent to demodulation multiplexer, the upward signal be separated is obtained after demultiplexing, downstream signal, outside OVPN signal and OVPN light source, wherein, upward signal is simply discarded, outside OVPN signal and OVPN light source are sent to optical switch, select outside OVPN signal in this optical fibre tree needed for distant-end node and light source by optical switch; Meanwhile, Centroid generates upper line light source, is broadcast to all distant-end nodes in this optical fibre tree together with the outside OVPN signal needed for downstream signal, distant-end node, OVPN light source, inner OVPN signal;
After S6:OVPN sign off, distant-end node under this OVPN sends OVPN to central office and removes information, after central office receives OVPN releasing information, this OVPN resource is regained, and disconnect corresponding OVPN light source switch, send OVPN to all Centroids and distant-end node simultaneously and stop using information, Centroid disconnects corresponding optical switch after receiving this information, and OVPN user receives this information, stop OVPN communication, Centroid is removed in OVPN communication.
Goal of the invention of the present invention is achieved in that
The OFDMA metropolitan area access UNE of the compatible OVPN communication of the present invention and communication means, OVPN communication includes outside OVPN communication and communicates with inner OVPN; In central office, realized control and the distribution of OVPN light source by M × M optical switch; In distant-end node, OVPNOFDM transmitter and receiver is adopted to realize generation and the reception of OVPN signal respectively; Centroid dynamically receives from the outside OVPN signal in fiber optic loop according to network OVPN signal intelligence, and the OVPN signal of needs is broadcast to all distant-end nodes of subordinate, and judge it is broadcast in optical fibre tree inside or mail to other Centroids by fiber optic loop according to the OVPN signal type that distant-end node is uploaded.Adopt the present invention, OVPN communication can be realized at OFDMA metropolitan area access UNE, meet the OVPN demand of user.
OFDMA metropolitan area access UNE and the communication means of the compatible OVPN communication of the present invention have following beneficial effect:
1., in central office, by adopting the transmission of the light source of M × M optical switch control OVPN network, dynamically can carry out the distribution of light source, and organically can combine with dynamically bandwidth resource distribution, realize the flexible dispatching of bandwidth resources;
2., in central office, downstream signal and OVPN signal optical source can be produced by adopting tunable optical comb generator, the extensibility of network can be improved, and do not need complicated temperature control system, reducing the cost of whole network;
3., whole network adopts OVPN application and removes mechanism, can realize centralized management and the monitoring thereof of all OVPN communication in whole network, reduce the complexity of the monitor and managment of whole network in central office;
4., whole network adopt OVPN application and remove mechanism, organically can combine with dynamic channel allocation, realize recycling of OVPN resource, improve the utilance of resource;
5., whole network adopts the bandwidth resource allocation scheme proposed, and do not need additionally to increase the network equipment, just can support that large-scale inner OVPN communicates simultaneously and communicate with outside OVPN;
6., the OVPN communication of whole real-time performance low cost, although OVPN communication employing broadcast type sends to all distant-end nodes in optical fibre tree optical fibre tree, but in the middle of real network, upper network layer structure can be encrypted/decryption processing to communication data, therefore do not affect the confidentiality that whole OVPN communicates;
7., descending, the up and OVPN communication service that speed can be provided different for user by Resource Allocation in Networks of whole network, and do not need to increase any network cost.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the OVPN communication of the OFDMA metropolitan area access UNE of the compatible OVPN communication of the present invention;
Fig. 2 is a kind of embodiment Organization Chart of OFDMA metropolitan area access UNE of the present invention compatible OVPN communication;
Fig. 3 is that in the present invention, network bandwidth resources distributes schematic diagram.
The abbreviation of accompanying drawing Chinese and English represents: CO: central office; CN: Centroid; RN: distant-end node; OF: optical filter; EDFA: erbium-doped fiber amplifier; C: coupler; TBSF: tunable band-stop filter; AWG: array waveguide grating; TBPF: variable band-pass filter; S: beam splitter; USCW: up continuous light light source; US: upward signal; A:a road signal; B:b road signal; DS: downstream signal; Inter-OVPN: outside OVPN signal; Intra-OVPN: inner OVPN signal.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described, so that those skilled in the art understands the present invention better.Requiring particular attention is that, in the following description, when perhaps the detailed description of known function and design can desalinate main contents of the present invention, these are described in and will be left in the basket here.
Execution mode
For convenience of description, first the relevant speciality term occurred in embodiment is described:
OFDM (OrthogonalFrequencyDivisionMultiplexing): OFDM;
OFDMA (OrthogonalFrequencyDivisionMultipleAccess): orthogonal frequency-time multiple access;
CO (CentralOffice): central office;
CN (CentralNode): Centroid;
RN (RemoteNode): distant-end node;
PD (Photodiode): photodiode;
OF (OpticalFilter): optical filter;
EDFA (Erbium-dopedOpticalFiberAmplifier): erbium-doped fiber amplifier;
TBPF (TunableBandPassFilter): variable band-pass filter;
TBSF (TunableBandStopFilter): tunable band-stop filter;
PC (PolarizationController): Polarization Controller;
MZM (MachZehnderModulator): MZ Mach-Zehnder;
AWG (ArrayedWaveguideGrating): array waveguide grating
C (Coupler): coupler;
S (Splitter): beam splitter;
USCW (UpStreamContinuousWavelength): up continuous light light source.
Fig. 1 is the schematic diagram of the OVPN communication of the OFDMA metropolitan area access UNE of the compatible OVPN communication of the present invention.In the present embodiment, as shown in Figure 1, the OVPN system of access UNE in OFDMA metropolitan area of the present invention comprises the OFDMA fiber optic loop and several OFDMA optical fibre trees that connect core net and user terminal, wherein OFDMA fiber optic loop comprises central office CO and several Centroids CN, and OFDMA optical fibre tree comprises Centroid CN and coupled several distant-end nodes RN.In present embodiment, the OFDMA metropolitan area access fiber optic loop of UNE and optical fibre tree all adopt single monomode fiber, its detailed construction and working method can see " University of Electronic Science and Technology, a kind of fusion access net system based on OFDMA, Chinese invention patent; CN102638434A, 20120815 ".For ease of describing, only depict two optical fibre trees in Fig. 1, the optical fibre tree be namely connected with Centroid CN-i, CN-j.
In the present invention, OVPN communication is divided into the inner OVPN intra-OVPN that communicates and communicates with outside OVPN inter-OVPN.Intra-VPN communication refers to the OVPN communication in an optical fibre tree, as shown in α data flow in Fig. 1, the OVPN nonpassage of signal that intra-OVPN network produces crosses the optical fiber ring type structure that central office CO and Centroid CN forms, only in this optical fibre tree, carry out Signal transmissions, be called inner OVPN signal.Inter-OVPN communication refers to the OVPN communication of leap at least two optical fibre trees, and as shown in β data flow in Fig. 1, the OVPN signal that inter-OVPN network produces will be delivered to by fiber optic loop the transmission that other optical fibre trees complete OVPN signal.Fig. 2 is a kind of embodiment Organization Chart of OFDMA metropolitan area access UNE of the present invention compatible OVPN communication.In the present embodiment, as shown in Figure 2, in the OFDMA metropolitan area access UNE of the compatible OVPN communication of the present invention, central office CO1 is sent to fiber optic loop for generation of downstream signal and OVPN light source, receives upward signal, and as the terminal of outside OVPN signal.Central office CO1 comprises:
Tunable optical comb generator 101, for generation of pectination light signal, sends to the first array waveguide grating 102.
First array waveguide grating 102, the light source produced for tunable optical being combed generator 101 carries out demultiplexing, obtain multipath light signal, a part is as lower line light source, another part is as OVPN light source, lower line light source sends to descending ofdm signal transmitter 103 for downlink communication, and OVPN light source sends to M × M optical switch 104 to communicate for OVPN.The quantity n of OVPN light source is less than or equal to the quantity of optical switch in M × M optical switch.
In the present embodiment, tunable optical comb generator 101 and the first array waveguide grating 102 is adopted to combine as descending light source generator and OVPN light source generator.In actual applications, also other modes can be adopted, as adopted two light source generators respectively, one sends to descending ofdm signal transmitter 103 as line light source under descending light source generator generation multichannel, and another produces OVPN light source as OVPN light source generator and sends to M × M optical switch 104.
Descending ofdm signal transmitter 103, for the light OFDM modulation utilizing lower line light source to carry out downstream signal, sends to the second array waveguide grating 105 by modulating the multichannel downstream signal obtained.
One M × M optical switch 104, optical switch quantity is M
1, arrange according to actual conditions.For the break-make of control OVPN light source, the OVPN light source passed through sends to the second array waveguide grating 105.When central office CO receive application OVPN set up information time, corresponding OVPN light source and channel can be distributed to this OVPN, closed corresponding optical switch simultaneously, using the light source that this light source is communicated as OVPN by the distant-end node RN that fiber optic loop and optical fibre tree are transferred to OVPN subordinate.
Second array waveguide grating 105, for merging by all downstream signals with by the OVPN light source of M × M optical switch, sends to the first coupler 106.
Central office's fiber amplifier 107, amplifies for the Received signal strength obtained from fiber optic loop by central office CO1, sends to the first optical filter 108.The fiber amplifier adopted in present embodiment is erbium-doped optical fiber amplifier EDFA.
First optical filter 108, for leaching outside OVPN signal and upward signal from Received signal strength, sending to optical comb filter 109 by outside OPVN signal, upward signal being sent to the 3rd array waveguide grating 110.
Optical comb filter 109, for by all light carrier filterings in the single-side belt ofdm signal of all outside OVPN channel transfer, obtains filtered outside OVPN signal, sends to the first coupler 106.
First coupler 106, for the downstream signal that merged by the second array waveguide grating 105 and OVPN light source, and the OVPN signal that the first optical filter 108 leaches merges, and is sent to fiber optic loop.
3rd array waveguide grating 110, for by upward signal demultiplexing, sends to upgoing O FDM signal receiver 111.
Upgoing O FDM signal receiver 111, to go forward side by side row relax for receiving upward signal.
Centroid CN-i is used for receiving and converting downlink signal, upward signal, OVPN signal and OVPN light source, wherein OVPN signal comprises the outside OVPN signal that obtains from fiber optic loop and the distally outside OVPN signal that obtains of node RN-i and inner OVPN signal, carry out corresponding process and send, comprising:
First fiber amplifier 201, for being amplified by the Received signal strength received from fiber optic loop and sending to beam splitter 202, Received signal strength comprises upward signal, downstream signal, outside OVPN signal and OVPN light source.In present embodiment, the first fiber amplifier adopts erbium-doped optical fiber amplifier EDFA.
Beam splitter 202, for being divided into the identical signal of two-way by the Received signal strength amplified through the first fiber amplifier: a road signal and b road signal, send to a path filter 203 and b road array waveguide grating 204 respectively;
A path filter 203, parameter is arranged according to the total bandwidth of all available Foreign OVPN channel occupancies that place optical fibre tree is assigned to, for the outside OVPN signal that this optical fibre tree of filtering last time produces, obtain upward signal, downstream signal, OVPN light source and the outside OVPN signal from other optical fibre trees after filtering, and filtered a road signal is sent to the 3rd coupler 213.In present embodiment, a path filter 203 adopts tunable band-stop filter TBSF.
B road array waveguide grating 204, for b road Received signal strength is carried out demultiplexing, obtain downstream signal, upward signal, outside OPVN signal and OVPN light source, wherein upward signal directly abandons, downstream signal sends to the second coupler 207, and outside OVPN signal and OVPN light source send to the 2nd M × M optical switch 205.
2nd M × M optical switch 205, optical switch quantity is M
2, and M
2>=M
1, pass through for the outside OVPN signal and OVPN light source being controlled correspondence by closed and disconnected optical switch, if namely will send it to the distant-end node of this optical fibre tree, then corresponding optical switch is in closure state, if not being then in off-state.The outside OVPN signal passed through and OVPN light source send to the second coupler 207.
Up light source generator 206, for generation of the upper line light source needed for upward signal modulation, sends to the second coupler 207.In present embodiment, the up light source generator 206 of employing is up continuous light light source.
Second fiber amplifier 209, for amplifying the signal from distant-end nodes all in this optical fibre tree and sending to the second optical filter 210, the signal from all distant-end nodes comprises inner OVPN signal, outside OVPN signal and upward signal.In present embodiment, fiber amplifier 209 adopts erbium-doped optical fiber amplifier EDFA.
Second optical filter 210, the bandwidth of parameter shared by internal system OVPN channel is arranged, signal for being sent by distant-end node RN is divided into inner OVPN signal and other signals, send to the second coupler 207 and the 3rd coupler 211 respectively, other signals comprise the outside OVPN signal and upward signal that in this optical fibre tree, all distant-end node RN generate.
Second coupler 207, for the downstream signal will obtained from b road array waveguide grating 204, outside OPVN signal and OVPN light source, the upper line light source that up light source generator 206 produces and the inside OVPN signal that the second optical filter 210 obtains merge, and are broadcast to all remote subscriber RN together by beam splitter/coupler 4.
In present embodiment, the combined signal of the downstream signal, outside OPVN signal, OVPN light source, upper line light source and the inner OVPN signal that adopt circulator 208 to be obtained by second coupler 207 sends to all distant-end node RN of Centroid CN-i subordinate, and the transmission signal received from distant-end node RN all in this optical fibre tree, comprise outside OVPN signal, inner OVPN signal, upward signal, send to the second fiber amplifier 209.
3rd coupler 211, for upward signal, downstream signal and the outside OVPN signal from other optical fibre trees that a road signal is obtained after a path filter 203, and the upward signal that generates of this optical fibre tree to obtain through the second optical filter 210 and outside OVPN signal merge, be sent to fiber optic loop.
Distant-end node RNi is user side, downstream signal, outside OPVN signal, OVPN light source, upper line light source and inner OVPN signal is received from Centroid CN-i, then carry out corresponding modulation and demodulation process, and send the upward signal after modulation and OVPN signal to Centroid CN-i.In present embodiment, the signal that all distant-end node RN send by beam splitter/coupler 4 merges, and then sends to Centroid CN-i.
Distant-end node RNi comprises:
Distant-end node fiber amplifier 301, for distant-end node is sent to the 3rd optical filter 302 after all signals that the Centroid CN-i of correspondence receives amplify, the Received signal strength of distant-end node comprises downstream signal, outside OPVN signal, OVPN light source, upper line light source and inner OVPN signal.In present embodiment, the distant-end node fiber amplifier of employing is erbium-doped optical fiber amplifier EDFA.
3rd optical filter 302, for by downstream signal, receive outside OPVN signal, OVPN light source, upper line light source and inner OVPN Signal separator, OVPNOFDM signal transmitter 305 is sent to be used for the modulation of OVPN signal OVPN light source, OVPNOFDM signal receiver 306 is sent to carry out the reception of OVPN signal outside OVPN signal and inner OVPN signal, send to upgoing O FDM signal transmitter 307 to be used for the modulation of upward signal upper line light source, sent to by downstream signal descending ofdm signal receiver 308 to carry out the reception of downstream signal; And the upward signal that the OVPN signal produced by OVPNOFDM signal transmitter 305 and upgoing O FDM signal transmitter 307 produce, merges and sends to corresponding Centroid CN-i.
OVPNOFDM signal transmitter 305, for utilizing OVPN light source corresponding to OVPN belonging to distant-end node RN to carry out OVPN signal madulation, then sends to the 3rd optical filter 302 by the OVPN signal after modulation.The transmitted in both directions between the 3rd optical filter 302 and OVPNOFDM signal transmitter 305 is realized by circulator 303 in present embodiment.
OVPNOFDM signal receiver 306, for carrying out data demodulates and process by the outside OVPN signal received and inner OVPN signal.When this distant-end node belongs to multiple OVPN, because OVPN receiver will carry out demodulation to multiple OVPN signal, therefore adopting MIMO-OVPNOFDM receiver, for receiving multichannel OVPN signal, completing the acceptance to all outside OVPN signals or inner OVPN signal and demodulation.
Upgoing O FDM signal transmitter 307, for utilizing the upper line light source from Centroid CN-i to carry out upward signal modulation, and sends to the 3rd optical filter 302 by the upward signal after modulation.The transmitted in both directions between the 3rd optical filter 302 and upgoing O FDM signal transmitter 307 is realized by circulator 304 in present embodiment.
Descending ofdm signal receiver 308, for carrying out data demodulates and process to downstream signal.
All channels are divided into four parts by the OVPN communication means of access UNE in OFDMA metropolitan area of the present invention: up channel, down channel, outside OVPN channel and inner OVPN channel, and the bandwidth shared by four kinds of channels is without intersection, carry out respectively uplink and downlink, outside OVPN communication communicate with inner OVPN, concrete channel allocation and multiplex technique principle as described below:
I, downlink communication
In present embodiment, the Resourse Distribute principle of downlink communication is: the channel of the lower line light source of distribution according to need and correspondence thereof in units of optical fibre tree, when transmitted data amount is less, the channel of a lower line light source and correspondence thereof can be shared with OFDM by the distant-end node under one or more optical fibre tree.Setting transmitted data amount threshold value, when transmitted data amount is larger, all distant-end nodes under an optical fibre tree are divided into multiple distant-end node group, this division can divide according to situations such as the type of distant-end node or regions, each distant-end node group comprises one or more distant-end node, this optical fibre tree is assigned at the channel of central office p lower line light source and correspondence thereof, p equals the quantity of distant-end node group, and all distant-end nodes in each distant-end node group share the channel of this lower line light source and correspondence thereof with OFDM scheme.So by downlink communication service that the Subcarrier Allocation Algorithm in the distribution of lower line light source and bandwidth and OFDM scheme can provide speed different for user.
II, uplink communication
Uplink communication has two kinds of channel assignment scheme at present: the allocative decision based on TDMA and the allocative decision based on OFDMA.Based in the allocative decision of TDMA, all distant-end node RN in each optical fibre tree use a up channel jointly, and these distant-end nodes RN carries out Channel Sharing by the time slot allocation in TDMA technology; Based in the allocative decision of OFDMA, all distant-end node RN in each optical fibre tree use a up channel jointly, and these distant-end nodes RN carries out Channel Sharing by the sub carries allocation in OFDMA technology.
III, OVPN traffic channel assignment
OVPN communication primary channel distribution principle: under each OVPN, an optical fibre tree distributes an OVPN light source and corresponding channel, and under this optical fibre tree, all OVPN distant-end nodes share this OVPN light source and corresponding channel
Inner OVPN communication primary channel distributes: man-to-man allocative decision, each optical fibre tree all can use all inside OVPN channels, in an optical fibre tree when there being OVPN to need to set up communication, just a distribution useable internal OVPN channel and light source thereof use to all distant-end node RN of the inner OVPN communication of the needs in this optical fibre tree, these distant-end nodes RN by the slot allocation technique in TDMA technology, or passes through this channel of sub carries allocation Techno-sharing in OFDMA technology.
Outside OVPN communication primary channel distributes: many-to-one allocative decision, namely each optical fibre tree in multiple optical fibre trees of the outside OVPN communication of setting up is needed to be assigned with an available Foreign OVPN channel, use to the distant-end node RN under this optical fibre tree, and belong to the RN of an optical fibre tree by the slot allocation technique in TDMA technology, or by this channel of sub carries allocation Techno-sharing in OFDMA technology, therefore, in this many-one allocative decision, all OVPN channel numbers that outside OVPN takies equal the number of optical fibre tree under this outside OVPN.
In order to ensure OVPN telecommunication service quality, guarantee that each OVPN user has higher traffic rate, under the distribution of OVPN communication primary channel is only applicable to OVPN, each optical fibre tree has the situation of the few OVPN distant-end node of quantity.When an optical fibre tree has a large amount of OVPN distant-end nodes, OVPN communication optimization channel assignment scheme can be adopted.
OVPN communication optimization channel allocation: when an optical fibre tree has a large amount of OVPN distant-end nodes, these distant-end nodes are divided into multiple distant-end node group, each distant-end node group comprises one or more distant-end node, this optical fibre tree is assigned at the channel of central office q OVPN light source and correspondence thereof, q equals the quantity of distant-end node group, distant-end node in each distant-end node group shares the channel of this OVPN light source and correspondence thereof with time division multiplexing or OFDM scheme, the OVPN communication service that speed can be provided different for OVPN user by the method.
Fig. 3 is Resource Allocation in Networks schematic diagram in the present invention.As shown in Figure 3, the available bandwidth that whole Metro access networks merges network is divided into the overlapping subband of multiple complementation, and the interval between subband and subband is as guard band, and each subband is as a communication channel in the communications; All subbands are divided into four parts: up channel, down channel, outside OVPN channel and inner OVPN channel, carry out up, descending, outside OVPN communication respectively and communicate with inner OVPN.
Whole outside OVPN channel is allocated to again different optical fibre trees.The outside OVPN channel that wherein each optical fibre tree is assigned to is continuous print, and as the available Foreign OVPN channel of this optical fibre tree, whole outside OVPN channel has Total as shown in Figure 3, wherein a continuous print channel distribution gives optical fibre tree-1, b gives optical fibre tree-2, c to optical fibre tree-3, d to optical fibre tree-i.Communicate when there being outside OVPN and need to set up, central office, when distributing the outside OVPN channel of optical fibre tree, can only distribute the OVPN channel that this optical fibre tree pre-sets, namely can only distribute the available Foreign OVPN channel of this optical fibre tree; Such as optical fibre tree-1 can not distribute the available Foreign OVPN channel of optical fibre tree-2.In an outside OVPN like this, all OVPN users in an optical fibre tree, namely remote subscriber RN shares an outside OVPN channel by time division multiplexing tdm A or OFDMA, and because the outside OVPN available channel of an optical fibre tree is continuous, the useless outside OVPN information produced by this optical fibre tree after therefore can enclosing along fiber optic loop one with a filter filtering transmission.
The communication of inner OVPN is only carried out in this optical fibre tree, the information of inner OVPN can not be sent in fiber optic loop to be transmitted, therefore all inner OVPN channels all can distribute to the use of each optical fibre tree, and different optical fibre trees can use same inner OVPN channel.
The concrete communication steps of the OVPN communication means of access UNE in OFDMA metropolitan area of the present invention comprises:
S1: network bandwidth resources is distributed and system configuration: available bandwidth is divided into four parts: upstream bandwidth, downlink bandwidth, the inner OVPN bandwidth of outside OVPN bandwidth sum, this frequency band shared by four fractional bandwidth is divided into again multiple subbands not overlapping mutually separately, respectively as up channel, down channel, outside OVPN channel and inner OVPN channel, communicate with inner OVPN for uplink communication, downlink communication, outside OVPN communication; All inside OVPN channels are assigned to each optical fibre tree as its useable internal OVPN channel; All outside OVPN channels are divided into m part, and each part comprises multiple continuous print channel, and m is the number of optical fibre tree in system, and the channel of this m part is distributed to m optical fibre tree respectively as its available Foreign OVPN channel;
Central office is provided with optical switch and sends to control OVPN light source, and each Centroid is respectively arranged with optical switch to the reception of control OVPN light source and outside OVPN signal, and in Centroid, optical switch quantity is more than or equal to optical switch quantity in central office;
S2: when several distant-end nodes need to set up an OVPN communicate time, all distant-end nodes utilize uplink communication to send OVPN to central office and set up application message, central office receives OVPN and sets up application message, the OVPN channel within the scope of the available bandwidth of OVPN light source and its correspondence is distributed for the optical fibre tree belonging to this OVPN, different OVPN distributes different OVPN light sources and channel: for optical fibre tree inside OVPN, and central office is that optical fibre tree distributes an available inside OVPN light source and inner OVPN channel; For outside OVPN, central office is that in outside OVPN, each optical fibre tree distributes an available outside OVPN light source and corresponding OVPN channel;
S3: OVPN light source information and OVPN channel information are sent to Centroid and the distant-end node of corresponding OVPN subordinate by downlink communication by central office, central office and corresponding Centroid close its corresponding OVPN switch, OVPN light source is sent in fiber optic loop by central office, received by the Centroid in the optical fibre tree of corresponding OVPN subordinate and be forwarded to distant-end node, under each OVPN, the multiple distant-end nodes belonged in same optical fibre tree share this OVPN light source be assigned to and corresponding OVPN channel;
S4: distant-end node utilizes the OVPN light source and OVPN channel that are fitted on from center score of the game, carry out light OFDM modulation and obtain OVPN signal, and the upper line light source utilizing Centroid to send carries out light OFDM modulation obtains upward signal, OVPN signal is sent to together with upward signal corresponding Centroid;
S5: Centroid receives from the OVPN signal of all distant-end nodes and upward signal, utilize filter that inner OVPN Signal separator is out sent it back distant-end node, remaining distant-end node upward signal and outside OVPN signal are then sent in fiber optic loop and transmit;
Centroid receives the mixed signal from the upward signal in fiber optic loop, downstream signal, outside OVPN signal and OVPN light source simultaneously, and the outside OVPN signal wherein received comprises the outside OVPN signal that in network, all optical fibre trees send; First mixed signal is divided into two-way by Centroid CO, the outside OVPN signal that one road signal is sent by this optical fibre tree before utilizing in the outside OVPN signal of filter filtering, then by obtain after filtering upward signal, downstream signal, other optical fibre trees outside OVPN signal and this optical fibre tree generate upward signal, be sent to fiber optic loop together with outside OVPN signal;
Another road signal is sent to demodulation multiplexer, the upward signal be separated is obtained after demultiplexing, downstream signal, outside OVPN signal and OVPN light source, wherein, upward signal is simply discarded, outside OVPN signal and OVPN light source are sent to optical switch, select outside OVPN signal in this optical fibre tree needed for distant-end node and light source by optical switch; Meanwhile, Centroid generates upper line light source, is broadcast to all distant-end nodes in this optical fibre tree together with the outside OVPN signal needed for downstream signal, distant-end node, OVPN light source, inner OVPN signal;
After S6:OVPN sign off, distant-end node under this OVPN sends OVPN to central office and removes information, after central office receives OVPN releasing information, this OVPN resource is regained, and disconnect corresponding OVPN light source switch, send OVPN to all Centroid CO and distant-end node RN simultaneously and stop using information, Centroid disconnects corresponding optical switch after receiving this information, and OVPN user receives this information, stop OVPN communication, Centroid is removed in OVPN communication.
Visible, adopt the present invention, OVPN communication can be realized in OFDMA metropolitan area access UNE, and can support that multiple OVPN communicates simultaneously.
Although be described the illustrative embodiment of the present invention above; so that those skilled in the art understand the present invention; but should be clear; the invention is not restricted to the scope of embodiment; to those skilled in the art; as long as various change to limit and in the spirit and scope of the present invention determined, these changes are apparent, and all innovation and creation utilizing the present invention to conceive are all at the row of protection in appended claim.
Claims (8)
1. the OFDMA metropolitan area access UNE of a compatible OVPN communication, comprise the OFDMA fiber optic loop and several OFDMA optical fibre trees that connect core net and user terminal, wherein OFDMA fiber optic loop comprises a central office and several Centroids, OFDMA optical fibre tree comprises Centroid in an OFDMA fiber optic loop and several coupled distant-end nodes, it is characterized in that:
Described central office comprises descending light source generator, descending ofdm signal transmitter, OVPN light source generator, M × M optical switch, the second array waveguide grating, central office's fiber amplifier, the first optical filter, optical comb filter, the first coupler, the 3rd array waveguide grating, upgoing O FDM signal receiver, wherein:
Descending light source generator, for generation of line light source under multichannel, sends to descending ofdm signal transmitter;
Descending ofdm signal transmitter, for the light OFDM modulation utilizing lower line light source to carry out downstream signal, sends to the second array waveguide grating by modulating the multichannel downstream signal obtained;
OVPN light source generator, for generation of n OVPN light source, send to M × M optical switch, wherein n is less than or equal to the quantity of optical switch in M × M optical switch;
One M × M optical switch, optical switch quantity is M
1, for the break-make of control OVPN light source, the OVPN light source passed through sends to the second array waveguide grating;
Second array waveguide grating, for merging by all downstream signals with by the OVPN light source of M × M optical switch, sends to the first coupler;
Central office's fiber amplifier, amplifies for central office is received from fiber optic loop the Received signal strength obtained, sends to the first optical filter;
First optical filter, for being separated with upward signal by the outside OVPN signal in Received signal strength, sending to optical comb filter by outside OPVN signal, upward signal being sent to the 3rd array waveguide grating;
Optical comb filter, for by the light carrier filtering in the single-side belt ofdm signal of all outside OVPN channel transfer, obtains filtered outside OVPN signal, sends to the first coupler;
First coupler, for the downstream signal that merged by the second array waveguide grating and OVPN light source, and to be merged by the filtered outside OVPN signal of optical comb filter, is sent to fiber optic loop;
3rd array waveguide grating, for by upward signal demultiplexing, sends to upgoing O FDM signal receiver;
Upgoing O FDM signal receiver, to go forward side by side row relax for receiving upward signal;
Described Centroid comprises the first fiber amplifier, beam splitter, a path filter, b road array waveguide grating, the 2nd M × M optical switch, up light source generator, the second fiber amplifier, the second optical filter, the second coupler, the 3rd coupler, wherein:
First fiber amplifier, for being amplified by the Received signal strength received from fiber optic loop and sending to beam splitter, Received signal strength comprises upward signal, downstream signal, outside OVPN signal and OVPN light source;
Beam splitter, for being divided into the identical signal of two-way by the Received signal strength amplified through the first fiber amplifier: a road signal and b road signal, send to a path filter and b road array waveguide grating respectively;
A path filter, parameter is arranged according to the total bandwidth of all available Foreign OVPN channel occupancies that place optical fibre tree is assigned to, for the outside OVPN signal that this optical fibre tree of filtering last time produces, obtain upward signal, downstream signal, OVPN light source and the outside OVPN signal from other optical fibre trees after filtering, and filtered a road signal is sent to the 3rd coupler;
B road array waveguide grating, for b road signal is carried out demultiplexing, obtain downstream signal, upward signal, outside OPVN signal and OVPN light source, wherein upward signal directly abandons, downstream signal sends to the second coupler, and outside OVPN signal and OVPN light source send to the 2nd M × M optical switch;
2nd M × M optical switch, optical switch quantity is M
2, and M
2>=M
1, pass through for the outside OVPN signal and OVPN light source being controlled correspondence by closed and disconnected optical switch, the outside OVPN signal passed through and OVPN light source are sent to the second coupler;
Up light source generator, for generation of the upper line light source needed for upward signal modulation, sends to the second coupler;
Second fiber amplifier, for amplifying the signal from distant-end nodes all in this optical fibre tree and sending to the second optical filter, the signal from all distant-end nodes comprises inner OVPN signal, outside OVPN signal and upward signal;
Second optical filter, the bandwidth of parameter shared by internal system OVPN channel is arranged, signal for being sent by distant-end node is divided into inner OVPN signal and other signals, send to the second coupler and the 3rd coupler respectively, other signals comprise the outside OVPN signal and upward signal that in this optical fibre tree, all distant-end nodes generate;
Second coupler, for the downstream signal will obtained from b road array waveguide grating, outside OPVN signal and OVPN light source, the upper line light source that up light source generator produces and the inside OVPN signal that the second optical filter obtains merge, and then send to all remote subscribers of this optical fibre tree;
3rd coupler, for upward signal, downstream signal and the outside OVPN signal from other optical fibre trees that a road signal is obtained after a path filter, and the upward signal that generates of this optical fibre tree to obtain through the second optical filter and outside OVPN signal merge, be sent to fiber optic loop;
Described distant-end node comprises descending ofdm signal receiver, upgoing O FDM signal transmitter, OVPNOFDM signal receiver, OVPNOFDM signal transmitter, the 3rd optical filter, distant-end node fiber amplifier, wherein:
Distant-end node fiber amplifier, for distant-end node is sent to the 3rd optical filter after all signals that the Centroid of correspondence receives amplify, the Received signal strength of distant-end node comprises downstream signal, outside OPVN signal, OVPN light source, upper line light source and inner OVPN signal;
3rd optical filter, for by downstream signal, outside OPVN signal, OVPN light source, upper line light source and inner OVPN Signal separator, OVPN light source is sent to OVPNOFDM signal transmitter, outside OVPN signal and inner OVPN signal are sent to OVPNOFDM signal receiver, upper line light source is sent to upgoing O FDM signal transmitter, downstream signal is sent to descending ofdm signal receiver; The upward signal that the OVPN signal produce OVPNOFDM signal transmitter and upgoing O FDM signal transmitter produce merges, and then sends to corresponding Centroid;
OVPNOFDM signal transmitter, carries out OVPN signal madulation for the OVPN light source utilizing OVPN belonging to distant-end node corresponding, OVPN signal is sent to the 3rd optical filter;
OVPNOFDM signal receiver, for carrying out data demodulates and process by the outside OVPN signal received or inner OVPN signal;
Upgoing O FDM signal transmitter, for utilizing upper line light source to carry out upward signal modulation, sends to the 3rd optical filter by upward signal;
Descending ofdm signal receiver, for carrying out data demodulates and process to downstream signal.
2. access UNE in OFDMA metropolitan area according to claim 1, it is characterized in that, described descending light source generator and OVPN light source generator combine employing tunable optical comb generator and the first array waveguide grating, wherein:
Tunable optical comb generator, for generation of pectination light signal, sends to the first array waveguide grating;
First array waveguide grating, the pectination light signal produced for tunable optical being combed generator carries out demultiplexing, obtain multipath light signal, a part is as lower line light source, another part is as OVPN light source, lower line light source sends to descending ofdm signal transmitter, and OVPN light source sends to M × M optical switch.
3. access UNE in OFDMA metropolitan area according to claim 1, it is characterized in that, described OVPNOFDM signal receiver is MIMO-OVPNOFDM signal receiver, for receiving multichannel OVPN signal.
4., based on an OFDMA metropolitan area access UNE communication means for access UNE in OFDMA metropolitan area according to claim 1, it is characterized in that comprising the following steps:
S1: network bandwidth resources is distributed and system configuration: available bandwidth is divided into four parts: upstream bandwidth, downlink bandwidth, the inner OVPN bandwidth of outside OVPN bandwidth sum, this frequency band shared by four fractional bandwidth is divided into again multiple subbands not overlapping mutually separately, respectively as up channel, down channel, outside OVPN channel and inner OVPN channel, communicate with inner OVPN for uplink communication, downlink communication, outside OVPN communication; All inner OVPN channels are assigned to each optical fibre tree as its useable internal OVPN channel; All outside OVPN channels are divided into m part, and each part comprises multiple continuous print channel, and m is the number of optical fibre tree in system, and the channel of this m part is distributed to m optical fibre tree respectively as its available Foreign OVPN channel;
Central office is provided with optical switch and sends to control OVPN light source, and each Centroid is respectively arranged with optical switch to the reception of control OVPN light source and outside OVPN signal, and in Centroid, optical switch quantity is more than or equal to optical switch quantity in central office;
S2: when several distant-end nodes need to set up an OVPN communicate time, all distant-end nodes utilize uplink communication to send OVPN to central office and set up application message, central office receives OVPN and sets up application message, the OVPN channel within the scope of the available bandwidth of OVPN light source and its correspondence is distributed for the optical fibre tree belonging to this OVPN, different OVPN distributes different OVPN light sources and channel: for optical fibre tree inside OVPN, and central office is that optical fibre tree distributes an available inside OVPN light source and corresponding inside OVPN channel; For outside OVPN, central office is that in outside OVPN, each optical fibre tree distributes an available outside OVPN light source and corresponding OVPN channel;
S3: OVPN light source information and OVPN channel information are sent to Centroid and the distant-end node of corresponding OVPN subordinate by downlink communication by central office, central office and corresponding Centroid close its corresponding OVPN switch, OVPN light source is sent in fiber optic loop by central office, received by the Centroid in the optical fibre tree of corresponding OVPN subordinate and be forwarded to distant-end node, under each OVPN, the multiple distant-end nodes belonged in same optical fibre tree share this OVPN light source be assigned to and corresponding OVPN channel;
S4: distant-end node utilizes the OVPN light source and OVPN channel that are fitted on from center score of the game, carry out light OFDM modulation and obtain OVPN signal, and the upper line light source utilizing Centroid to send carries out light OFDM modulation obtains upward signal, OVPN signal is sent to together with upward signal corresponding Centroid;
S5: Centroid receives from the OVPN signal of all distant-end nodes and upward signal, utilize filter that inner OVPN Signal separator is out sent it back distant-end node, remaining distant-end node upward signal and outside OVPN signal are then sent in fiber optic loop and transmit;
Centroid receives the mixed signal from the upward signal in fiber optic loop, downstream signal, outside OVPN signal and OVPN light source simultaneously, and the outside OVPN signal wherein received comprises the outside OVPN signal that in network, all optical fibre trees send; First mixed signal is divided into two-way by Centroid, the outside OVPN signal that one road signal is sent by this optical fibre tree before utilizing in the outside OVPN signal of filter filtering, is sent to fiber optic loop together with the upward signal then outside OVPN signal and this optical fibre tree of the upward signal obtained after filtering, downstream signal, other optical fibre trees generated, outside OVPN signal;
Another road signal is sent to demodulation multiplexer, the upward signal be separated is obtained after demultiplexing, downstream signal, outside OVPN signal and OVPN light source, wherein, upward signal is simply discarded, outside OVPN signal and OVPN light source are sent to optical switch, select outside OVPN signal in this optical fibre tree needed for distant-end node and light source by optical switch; Meanwhile, Centroid generates upper line light source, is broadcast to all distant-end nodes in this optical fibre tree together with the outside OVPN signal needed for downstream signal, distant-end node, OVPN light source, inner OVPN signal;
After S6:OVPN sign off, distant-end node under this OVPN sends OVPN to central office and removes information, after central office receives OVPN releasing information, this OVPN resource is regained, and disconnect corresponding OVPN light source switch, send OVPN to all Centroids and distant-end node simultaneously and stop using information, Centroid disconnects corresponding optical switch after receiving this information, and OVPN user receives this information, stop OVPN communication, Centroid is removed in OVPN communication.
5. OFDMA metropolitan area access UNE communication means according to claim 4, it is characterized in that, by time division multiplexing or OFDM realize share when the multiple distant-end nodes belonged in same optical fibre tree share the OVPN light source and corresponding OVPN channel that are assigned in described step S3.
6. OFDMA metropolitan area access UNE communication means according to claim 4, it is characterized in that, in described uplink communication, the wavelength of the upper line light source in different fiber tree is different, the up channel used is also different, and the upper line light source in each optical fibre tree is shared with time division multiplexing or OFDM scheme by distant-end nodes all in optical fibre tree with corresponding up channel.
7. OFDMA metropolitan area access UNE communication means according to claim 4, it is characterized in that, in described downlink communication, the channel of line light source and correspondence thereof under central office distributes according to need in units of optical fibre tree, setting transmitted data amount threshold value, when transmitted data amount is less than or equal to transmitted data amount threshold value, the channel of a lower line light source and correspondence thereof can be shared with OFDM by the distant-end node under one or more optical fibre tree; When transmitted data amount is greater than transmitted data amount threshold value, all distant-end nodes under an optical fibre tree are divided into multiple distant-end node group, each distant-end node group comprises one or more distant-end node, this optical fibre tree is assigned at the channel of central office p lower line light source and correspondence thereof, p equals the quantity of distant-end node group, and all distant-end nodes in each distant-end node group share the channel of a lower line light source and correspondence thereof with OFDM scheme.
8. according to claim 4 to 7 arbitrary described OFDMA metropolitan area access UNE communication means, it is characterized in that, in described OVPN communication, when an optical fibre tree has a large amount of OVPN distant-end nodes, these distant-end nodes are divided into multiple distant-end node group, each distant-end node group comprises one or more distant-end node, this optical fibre tree is assigned at the channel of central office q OVPN light source and correspondence thereof, q equals the quantity of all distant-end node groups, distant-end node in each distant-end node group shares the channel of this OVPN light source and correspondence thereof with time division multiplexing or OFDM scheme.
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