CN105763964A - Communication method, device and system applied to OFDMPON (orthogonal frequency division multiplexing-passive optical network) - Google Patents

Communication method, device and system applied to OFDMPON (orthogonal frequency division multiplexing-passive optical network) Download PDF

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CN105763964A
CN105763964A CN201410802054.XA CN201410802054A CN105763964A CN 105763964 A CN105763964 A CN 105763964A CN 201410802054 A CN201410802054 A CN 201410802054A CN 105763964 A CN105763964 A CN 105763964A
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optical network
data
network unit
described optical
preset
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CN105763964B (en
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曹攀
马壮
黄新刚
那婷
苏翼凯
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ZTE Corp
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ZTE Corp
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/40—Transceivers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems

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  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
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  • Optical Communication System (AREA)

Abstract

The invention discloses a communication method applied to an OFDMPON (orthogonal frequency division multiplexing-passive optical network). The communication method includes following steps that: when data are transmitted among a plurality of optical network units, optical network units adopted as senders send first data to optical network units adopted as receivers according to a preset first carrier frequency band; and the optical network units adopted as the receivers receive the first data sent by the optical network units adopted as the senders according to the preset first carrier frequency band, and when the optical network units adopted as the senders are different or the optical network units adopted as the receivers are different, preset first carrier frequency bands for data sending or data receiving among the optical network units are different. The invention also discloses a communication device and system applied to the OFDMPON. With the communication method, device and system applied to the OFDMPON of the invention adopted, communication among a plurality of groups of user terminals can be realized, and the flexibility, efficiency and speed of optical network communication can be improved.

Description

It is applied to the communication means of OFDM-PON, Apparatus and system
Technical field
The present invention relates to communication technical field, particularly relate to and a kind of be applied to the communication means of OFDM-PON, Apparatus and system.
Background technology
Generally at OFDM (OrthogonalFrequencyDivisionMultiplexing in prior art, OFDM) optical access network system in introduce the technology of frequency division multiplexing, by each ONU (OpticalNetworkUnit, optical network unit) VPN (VirtualPrivateNetwork to transmit, VPN (virtual private network)) data are transferred to OLT (opticallineterminal, optical line terminal) in, by reflecting part signal, downlink data is delivered to respectively target terminal user.Prior art has the disadvantage that the intercommunication mutually that cannot simultaneously realize between many group user terminals.
Summary of the invention
Offer is provided and a kind of is applied to the communication means of OFDM-PON, Apparatus and system, it is intended to solve OFDM-PON cannot realize the technical problem intercomed mutually between many group user terminals simultaneously.
To achieve these goals, the present invention provides a kind of communication means being applied to OFDM-PON, and described communication means comprises the following steps:
When transmitting data between multiple optical network units, each described optical network unit as sender sends the first data extremely as each described optical network unit of recipient according to preset first carrier frequency band；
As each described optical network unit of recipient according to the preset described first carrier band reception the first data from the described optical network unit as sender；
Wherein, different as the described optical network unit of sender or when as the described optical network unit difference of recipient, send between described optical network unit or the described first carrier frequency band that receives data preset is all different.
Preferably, described communication means is further comprising the steps of:
When multiple optical network units send the second data to optical line terminal, each described optical network unit sends the second data to optical line terminal according to the second preset carrier frequency band, and preset the second carrier frequency band of each described optical network unit all differs；
When multiple optical network units receive three data from described optical line terminal, each optical network unit receives the first data to be extracted that described optical line terminal sends according to the 3rd carrier frequency band that each optical network unit is preset；
Each optical network unit respectively according to preset the 3rd carrier frequency band of each optical network unit in the 3rd data corresponding to described first extracting data to be extracted, preset the 3rd carrier frequency band of each described optical network unit all differs.
Preferably, described when multiple optical network units send the second data to optical line terminal, each described optical network unit sends the second data to the step of optical line terminal according to the second preset carrier frequency band and includes:
When multiple optical network units send the second data to optical line terminal, each described optical network unit is modulated to sent the second data according to the second preset carrier frequency band respectively；
The second data through ovennodulation are sent to the first beam splitter by each described optical network unit, are undertaken sending to described optical line terminal after conjunction road processes by the second data through ovennodulation from each described optical network unit for described first beam splitter.
Preferably, described when transmitting data between multiple optical network units, send the first data as each described optical network unit of sender according to preset first carrier frequency band and include to the step of each described optical network unit as recipient:
When multiple optical network units as sender send the first data to multiple optical network unit as recipient, each described optical network unit as sender is modulated to sent the first data according to preset first carrier frequency band respectively；
The first data through ovennodulation are sent to the first beam splitter by each described optical network unit as sender, for described first beam splitter, each described the first data through ovennodulation received are carried out close the second data to be extracted generated after road processes to send to described optical line terminal, and by described optical line terminal, described second data to be extracted are reflexed to each described optical network unit as recipient.
Preferably, the described each described optical network unit as recipient includes from the step of the first data of the described optical network unit as sender according to preset described first carrier band reception:
As recipient each described optical network unit respectively according to the preset first carrier frequency band of each described optical network unit as recipient in the first data corresponding to described second extracting data to be extracted.
Additionally, to achieve these goals, the present invention also provides for a kind of communicator being applied to OFDM-PON, and described communicator includes:
First sending module, during for transmitting data between multiple optical network units, sends the first data extremely as each described optical network unit of recipient according to the first carrier frequency band that each described optical network unit as sender is preset；
First receiver module, for according to the preset described first carrier band reception of each described optical network unit as recipient the first data from the described optical network unit as sender；
Wherein, different as the described optical network unit of sender or when as the described optical network unit difference of recipient, send between described optical network unit or the described first carrier frequency band that receives data preset is all different.
Preferably, described communicator also includes:
Second sending module, for when multiple optical network units send the second data to optical line terminal, sending the second data to optical line terminal according to the second carrier frequency band that each described optical network unit is preset, preset the second carrier frequency band of each described optical network unit all differs；
Second receiver module, during for receiving three data from described optical line terminal at multiple optical network units, receives the first data to be extracted that described optical line terminal sends according to the 3rd carrier frequency band that each optical network unit is preset；
Extraction module, for respectively according to preset the 3rd carrier frequency band of each optical network unit in the 3rd data corresponding to described first extracting data to be extracted, preset the 3rd carrier frequency band of each described optical network unit all differs.
Preferably, described second sending module includes:
Second modulating unit, for when multiple optical network units send the second data to optical line terminal, being modulated to sent the second data according to the second carrier frequency band that each described optical network unit is preset respectively；
Second transmitting element, the second data for modulating through each described optical network unit send to the first beam splitter, are undertaken sending to described optical line terminal after conjunction road processes by the second data through ovennodulation from each described optical network unit for described first beam splitter.
Preferably, described first sending module includes:
First modulating unit, for when multiple optical network units as sender send the first data to multiple optical network unit as recipient, being modulated to sent the first data according to the first carrier frequency band that each described optical network unit as sender is preset respectively；
First transmitting element, for the first data through modulating as each described optical network unit of sender are sent to the first beam splitter, for described first beam splitter, each described the first data through ovennodulation received are carried out close the second data to be extracted generated after road processes to send to described optical line terminal, and by described optical line terminal, described second data to be extracted are reflexed to each described optical network unit as recipient.
Preferably, described first receiver module specifically for respectively according to the preset first carrier frequency band of each described optical network unit as recipient in the first data corresponding to described second extracting data to be extracted.
In addition, to achieve these goals, the present invention also provides for a kind of communication system being applied to OFDM-PON, and described communication system includes optical line terminal, some optical network units and the Optical Distribution Network being connected between described optical line terminal and each described optical network unit
Described optical line terminal includes reflecting module；
Described Optical Distribution Network includes the first beam splitter；
Described optical network unit includes the first sending module and the first receiver module；
When transmitting data between multiple optical network units, described first sending module is for sending the first data extremely described first beam splitter according to the first carrier frequency band that each described optical network unit as sender is preset；
Described first beam splitter is for being undertaken closing road by the first data received, and to generate the second data to be extracted, and sends the second data to be extracted generated to described reflecting module；
Described reflecting module is for reflexing to described first beam splitter by the signal section of reception；
Described first beam splitter is additionally operable to carry out the second data to be extracted received sending after light splitting to each described optical network unit as recipient；
Described first receiver module is for according to the preset described first carrier band reception of each described optical network unit as recipient the first data from the described optical network unit as sender；
Wherein, different as the described optical network unit of sender or when as the described optical network unit difference of recipient, send between described optical network unit or the described first carrier frequency band that receives data preset is all different.
Preferably,
Described optical network unit also includes the second sending module, the second receiver module and extraction module,
When multiple optical network units send the second data to described optical line terminal, described second sending module is for sending the second data extremely described first beam splitter according to the second carrier frequency band that each described optical network unit is preset, wherein, the second carrier frequency band that each described optical network unit is preset all differs；
Described first beam splitter is additionally operable to the second data that will receive, or the second data and the first data carry out closing behind road and send to described optical line terminal；
When described optical line terminal sends the 3rd data to multiple optical network unit, described optical line terminal sends the first data to be extracted extremely described first beam splitter according to the 3rd carrier frequency band that each described optical network unit is preset；
Described first beam splitter sends the second receiver module to each described optical network unit after the first data to be extracted received are carried out light splitting；
Described second receiver module is used for receiving described first data to be extracted；
Described extraction module, for respectively according to preset the 3rd carrier frequency band of each optical network unit in the 3rd data corresponding to described first extracting data to be extracted, preset the 3rd carrier frequency band of each described optical network unit all differs.
Preferably,
Described second sending module includes:
Second modulating unit, for when multiple optical network units send the second data to optical line terminal, being modulated to sent the second data according to the second carrier frequency band that each described optical network unit is preset respectively；
Second transmitting element, the second data for modulating through each described optical network unit send to the first beam splitter, send to described optical line terminal after the second data through ovennodulation from each described optical network unit being carried out conjunction road for described first beam splitter.
Preferably,
Described first sending module includes:
First modulating unit, for when multiple optical network units as sender send the first data to multiple optical network unit as recipient, being modulated to sent the first data according to the first carrier frequency band that each described optical network unit as sender is preset respectively；
First transmitting element, for the first data through modulating as each described optical network unit of sender are sent to described first beam splitter, undertaken closing road by each described the first data through ovennodulation received for described first beam splitter, to generate the second data to be extracted, and the second data to be extracted generated are sent to described reflecting module.
Preferably, described first receiver module specifically for respectively according to the preset first carrier frequency band of each described optical network unit as recipient in the first data corresponding to described second extracting data to be extracted.
The communication means being applied to OFDM-PON provided by the invention, Apparatus and system, when transmitting data between multiple optical network units, each described optical network unit as sender sends the first data extremely as each described optical network unit of recipient according to preset first carrier frequency band, as each described optical network unit of recipient according to the preset described first carrier band reception the first data from the described optical network unit as sender, it is thus possible to the intercommunication mutually simultaneously realized between many group user terminals, improve the motility of optical network communication and the efficiency of optical network communication and speed, and reduce cost.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet that the present invention is applied to the communication means first embodiment of OFDM-PON；
Fig. 2 is the refinement schematic flow sheet of step S10 in Fig. 1；
Fig. 3 is the schematic flow sheet that the present invention is applied to communication means second embodiment of OFDM-PON；
Fig. 4 is the refinement schematic flow sheet of step S30 in Fig. 3；
Fig. 5 is the principle schematic that optical network unit sends data；
Fig. 6 is the principle schematic that optical network unit receives data；
Fig. 7 is the high-level schematic functional block diagram that the present invention is applied to the communicator first embodiment of OFDM-PON；
Fig. 8 is the refinement high-level schematic functional block diagram of the second sending module in Fig. 7；
Fig. 9 is the high-level schematic functional block diagram that the present invention is applied to communicator second embodiment of OFDM-PON；
Figure 10 is the refinement high-level schematic functional block diagram of the second sending module in Fig. 9.
The realization of the object of the invention, functional characteristics and advantage will in conjunction with the embodiments, are described further with reference to accompanying drawing.
Detailed description of the invention
Should be appreciated that specific embodiment described herein is only in order to explain the present invention, is not intended to limit the present invention.
The present invention provides one to be applied to the communication means of OFDM-PON (Orthogonalfrequencydivisionmultiplexing-passiveopticalne twork, the EPON of OFDM).
In order to realize the intercommunication mutually between many group user terminals simultaneously, improve the motility of optical network communication and the efficiency of optical network communication and speed, and reduce cost, with reference to Fig. 1, Fig. 1 is the schematic flow sheet that the present invention is applied to the communication means first embodiment of OFDM-PON, in the present embodiment, the communication means being applied to OFDM-PON described in comprises the following steps:
Step S10, when transmitting data between multiple optical network units, each described optical network unit as sender sends the first data extremely as each described optical network unit of recipient according to preset first carrier frequency band；
It should be noted that, in the present embodiment and following example, represent optical network unit with ONU (OpticalNetworkUnit, optical network unit), represent optical line terminal with OLT (opticallineterminal, optical line terminal).
One as the optical network unit of sender send the first data to one as the optical network unit of recipient time, this is called a pair optical network unit as the optical network unit of sender with the optical network unit of this recipient that does.Described first carrier frequency band is between the pair of optical network unit and transmits the frequency band range residing for the carrier wave that the first data adopt.The preset first carrier frequency band of above-mentioned each pair of optical network unit can be configured according to actual needs, the preset first carrier frequency band of each pair of optical network unit is not overlapping each other, thus when the optical network unit as recipient receives the first data sent from the optical network unit as sender, it is possible to extract this as the first data sent corresponding to the optical network unit of sender according to first carrier frequency band.It should be noted that, first carrier frequency band can pre-set before ONU transmits data, it is also possible to distribute dynamically when ONU transmits data.
Specifically, with reference to the refinement schematic flow sheet that Fig. 2, Fig. 2 are step S10 in Fig. 1, step S10 includes:
Step S11, when multiple optical network units as sender send the first data to multiple optical network unit as recipient, each described optical network unit as sender is modulated to sent the first data according to preset first carrier frequency band respectively；
In the present embodiment, each described optical network unit ONU is all built-in with a manipulator, for instance can be MZM (Mach-ZehnderModulator, Mach increases Dare manipulator).When an ONU needs to send the first data to another ONU, the first data that first will send are modulated by its built-in MZM, are loaded on its preset carrier wave being in first carrier frequency band range by its first data to send.
Step S12, the first data through ovennodulation are sent to the first beam splitter by each described optical network unit as sender, for described first beam splitter, each described the first data through ovennodulation received are carried out close the second data to be extracted generated after road processes to send to described optical line terminal, and by described optical line terminal, described second data to be extracted are reflexed to each described optical network unit as recipient.
In the present embodiment, each ONU sends to the first beam splitter after the first data through ovennodulation carry out E/O (electricaltooptical, electro-optic conversion) conversion.Such as, if the quantity of ONU is N number of, then the first beam splitter can be N:1 the first beam splitter.The first data after ovennodulation from each ONU are carried out closing road by the first beam splitter, and finally synthesize a road optical signal (i.e. above-mentioned second data to be extracted), and then described second data to be extracted are sent to OLT by the first beam splitter again.Reflective optical system and uplink sounding device it is provided with in OLT side, for instance, described reflective optical system can be partially reflecting mirror, or is made up of FBG (fiber-brag-grating, Fiber Bragg Grating FBG) and the second beam splitter.After OLT receives described second data to be extracted, distributed into the energy of FBG and the energy of entrance uplink sounding device according to practical situation by the second beam splitter, by FBG, described second data to be extracted received are reflected back in Transmission Fibers, described second data to be extracted through reflection are split at remote node and carry out branch than the optical branching device for 1:N, and send to each ONU side, namely each ONU all receives a described second data to be extracted through reflection.FBG can reflect each up data respectively, and described second data to be extracted of reflection need through processing and amplifying to promote its power, so that it is guaranteed that its power can error free transmission after supporting reflex.
Step S20, as each described optical network unit of recipient according to the preset described first carrier band reception the first data from the described optical network unit as sender；
It should be noted that, in the present embodiment, different as the described optical network unit of sender or when as the described optical network unit difference of recipient, send between described optical network unit or the described first carrier frequency band that receives data preset is all different.It is to say, for a pair two optical network unit respectively as sender and recipient, transmission frequency band residing for the adopted carrier wave of data is different from another to two optical network units respectively as sender and recipient between.
Specifically, step S20 includes: as recipient each described optical network unit respectively according to the preset first carrier frequency band of each described optical network unit as recipient in the first data corresponding to described second extracting data to be extracted.
After each ONU receives above-mentioned second data to be extracted, first the second data to be extracted through reflection received are carried out O/E (opticaltoelectrical, opto-electronic conversion) conversion, owing to corresponding first carrier frequency band all differs when each receives data as the ONU of recipient, therefore the first data corresponding to each ONU can be extracted respectively by the first carrier frequency band corresponding to each ONU in ONU side.
The communication means being applied to OFDM-PON provided by the invention, when transmitting data between multiple optical network units, each described optical network unit as sender sends the first data extremely as each described optical network unit of recipient according to preset first carrier frequency band, as each described optical network unit of recipient according to the preset described first carrier band reception the first data from the described optical network unit as sender, it is thus possible to the intercommunication mutually simultaneously realized between many group user terminals, improve the motility of optical network communication and the efficiency of optical network communication and speed, and reduce cost.
Further, carry out upstream or downstream data transmission to realize multiple user terminal simultaneously, and improve the motility of optical network communication further, and improve efficiency and the speed of optical network communication, in or all embodiments a certain in the present invention, it is the schematic flow sheet that the present invention is applied to communication means second embodiment of OFDM-PON with reference to Fig. 3, Fig. 3.
In one embodiment, this to be applied to the communication means of OFDM-PON further comprising the steps of:
Step S30, when multiple optical network units send the second data to optical line terminal, each described optical network unit sends the second data to optical line terminal according to the second preset carrier frequency band, and preset the second carrier frequency band of each described optical network unit all differs；
Described second carrier frequency band is the frequency band range residing for carrier wave adopted when optical network unit sends the second data to optical line terminal.Preset the second carrier frequency band of each optical network unit above-mentioned can be configured according to actual needs, preset the second carrier frequency band of each optical network unit is not overlapping each other, thus when optical line terminal receives the second data sent from each optical network unit, it is possible to the second data sent corresponding to each optical network unit are extracted according to the second carrier frequency band.It should be noted that, the second carrier frequency band can pre-set before ONU transmits data, it is also possible to distribute dynamically when ONU transmits data.
Specifically, a certain in the present invention or in all embodiments, with reference to the refinement schematic flow sheet that Fig. 4, Fig. 4 are step S30 in Fig. 3, step S30 includes:
Step S31, when multiple optical network units send the second data to optical line terminal, each described optical network unit is modulated to sent the second data according to the second preset carrier frequency band respectively；
In the present embodiment, each described optical network unit ONU is all built-in with a manipulator, for instance can be MZM (Mach-ZehnderModulator, Mach increases Dare manipulator).When each ONU needs to send uplink data or VPN data (i.e. above-mentioned second data), the uplink data that first will send or VPN data are modulated by its built-in MZM, are loaded on its preset carrier wave being in the second carrier frequency band scope by its uplink data to send or VPN data.
Step S32, the second data through ovennodulation are sent to the first beam splitter by each described optical network unit, are undertaken sending to described optical line terminal after conjunction road processes by the second data through ovennodulation from each described optical network unit for described first beam splitter.
In the present embodiment, each ONU sends to the first beam splitter after the second data through ovennodulation carry out E/O (electricaltooptical, electro-optic conversion) conversion.Such as, if the quantity of ONU is N number of, then the first beam splitter can be N:1 the first beam splitter.The second data after ovennodulation from each ONU are carried out closing road and process by the first beam splitter, and finally synthesize a road optical signal, and then the optical signal behind the first beam splitter Zai Jianghe road sends to OLT.After optical signal after OLT side joint receives above-mentioned conjunction road, first the optical signal received is carried out O/E (opticaltoelectrical, opto-electronic conversion) conversion, to generate the signal of telecommunication after closing road, OLT side is provided with uplink sounding device, receives the signal of telecommunication after closing road by uplink sounding device.Owing to what each ONU sent all differs through the second carrier frequency band corresponding to the second data of ovennodulation, therefore the second data corresponding to each ONU can be extracted respectively by the second carrier frequency band corresponding to each ONU at optical line terminal.Therefore, the communication means that the present embodiment provides, it is capable of multiple optical network unit and sends data to optical line terminal simultaneously, namely the transmitting uplink data of multiple user terminal it is capable of, it is effectively improved the motility of optical network communication, improve efficiency and the speed of optical network communication, and reduce cost.
Step S40, when multiple optical network units receive three data from described optical line terminal, each optical network unit receives the first data to be extracted that described optical line terminal sends according to the 3rd carrier frequency band that each optical network unit is preset；
Described 3rd carrier frequency band is frequency band range corresponding when optical network unit extracts from three data of optical line terminal.Preset the 3rd carrier frequency band of each optical network unit above-mentioned can be configured according to actual needs, preset the 3rd carrier frequency band of each optical network unit is not overlapping each other, thus when each optical network unit receives three data from optical line terminal transmission, it is possible to the 3rd data sent corresponding to optical line terminal are extracted according to the 3rd carrier frequency band.It should be noted that, the 3rd carrier frequency band can pre-set before OLT transmits data, it is also possible to distribute dynamically when OLT transmits data.
In the present embodiment, when OLT needs to send respectively and organizes down link data (i.e. above-mentioned 3rd data) to multiple ONU more, wherein, each ONU correspondence receives one the 3rd data, first each the 3rd data are modulated according to the 3rd preset for the ONU carrier frequency band corresponding with the 3rd data respectively in OLT side, then each carry out close road again after the 3rd data of ovennodulation carry out E/O conversion process, first data to be extracted described in final conjunction Lu Weiyi road, described first data to be extracted are sent by OLT, first data to be extracted are after fiber-optic transfer, it is split at remote node and carries out branch than the optical branching device for 1:N, and send to each ONU, namely each ONU all receives a described first data to be extracted.
Step S50, each optical network unit respectively according to preset the 3rd carrier frequency band of each optical network unit in the 3rd data corresponding to described first extracting data to be extracted, preset the 3rd carrier frequency band of each described optical network unit all differs.
After each ONU receives the first data to be extracted, first the receive first data to be extracted are carried out O/E (opticaltoelectrical, opto-electronic conversion) conversion, OUN side is provided with downlink probe device, receives the first data to be extracted by downlink probe device.The 3rd carrier frequency band corresponding during due to each ONU downlink data receiving all differs, and therefore can extract the 3rd data corresponding to each ONU respectively by the 3rd carrier frequency band corresponding to each ONU in ONU side.
It should be noted that, above-mentioned steps S30, step S40 and step S10 are upon execution in no particular order sequentially.
The communication means being applied to OFDM-PON provided by the invention, when multiple optical network units send the second data to optical line terminal, each described optical network unit sends the second data to optical line terminal according to the second preset carrier frequency band, it is capable of multiple optical network unit and sends data to optical line terminal simultaneously, be namely capable of the transmitting uplink data of multiple user terminal；When multiple optical network units receive three data from described optical line terminal, each optical network unit receives the first data to be extracted that described optical line terminal sends according to the 3rd carrier frequency band that each optical network unit is preset, each optical network unit respectively according to preset the 3rd carrier frequency band of each optical network unit in the 3rd data corresponding to described first extracting data to be extracted, it is capable of multiple optical network unit and receives the data from optical line terminal simultaneously, be namely capable of the downlink data transmission of multiple user terminal.The communication means of the OFDM-PON of being applied to provided by the invention is effectively improved the motility of optical network communication, improves efficiency and the speed of optical network communication, and reduces cost.
Specifically, based on above-described embodiment, being the principle schematic that optical network unit sends data with reference to Fig. 5 and Fig. 6, Fig. 5, Fig. 6 is the principle schematic that optical network unit receives data, illustrates arranging n ONU below.Each ONU presets different first carrier frequency bands, the frequency band of the carrier occupancy different (not overlapping) that different ONU users adopt when sending data, as shown in Figure 5 and Figure 6, for i-th ONU end ONUi, when it is as transmitting terminal, the carrier frequency band being correspondingly arranged is λi, for frequency band λi, it is further subdivided into n sub-band, is set to λi-1…λi-k…λi-n, wherein, λi-kRepresent that ONUi is as transmitting terminal, and ONUk as receiving terminal time frequency band range shared by adopted carrier wave.Should be noted that, if not carrying out VPN traffic between two ONU end of synchronization, then corresponding first carrier frequency band can be reassigned to other ONU end and carries out VPN traffic, and the number of first carrier frequency band can adjust dynamically according to actual needs flexibly.
When ONUk receives the data from the reflection of OLT end as receiving terminal, ONUk receives the whole signal from OLT end, this signal packet is containing all of VPN signal, it is only necessary to extract the data corresponding to first carrier frequency band that this ONUk end is preset in the received data.
For above-mentioned steps S10, S20, S30, S40 and S50 concrete principle can refer to described above, do not repeat them here.
Should be noted that, above-mentioned uplink data, down link data and VPN data realize the mutual conversion between binary data and OFDM data before being transmitted or afterwards by Digital Signal Processing, and the computing of this process includes: serioparallel exchange S-P, parallel-serial conversion P-S, Fourier transformation FFT, inversefouriertransform IFFT, mapping Mapping, digital-to-analogue conversion ADC, analog digital conversion DAC, insertion and removal Cyclic Prefix Cyclicprefix and balanced Equalization.
The present invention further provides a kind of communicator being applied to OFDM-PON.
In order to realize the intercommunication mutually between many group user terminals simultaneously, improve the motility of optical network communication and the efficiency of optical network communication and speed, and reduce cost, it is the high-level schematic functional block diagram that the present invention is applied to the communicator first embodiment of OFDM-PON with reference to Fig. 7, Fig. 7.
In one embodiment, this communicator being applied to OFDM-PON includes:
First sending module 10, during for transmitting data between multiple optical network units, sends the first data extremely as each described optical network unit of recipient according to the first carrier frequency band that each described optical network unit as sender is preset；
It should be noted that, in the present embodiment and following example, represent optical network unit with ONU (OpticalNetworkUnit, optical network unit), represent optical line terminal with OLT (opticallineterminal, optical line terminal).
One as the optical network unit of sender send the first data to one as the optical network unit of recipient time, this is called a pair optical network unit as the optical network unit of sender with the optical network unit of this recipient that does.Described first carrier frequency band is between the pair of optical network unit and transmits the frequency band range residing for the carrier wave that the first data adopt.The preset first carrier frequency band of above-mentioned each pair of optical network unit can be configured according to actual needs, the preset first carrier frequency band of each pair of optical network unit is not overlapping each other, thus when the optical network unit as recipient receives the first data sent from the optical network unit as sender, it is possible to extract this as the first data sent corresponding to the optical network unit of sender according to first carrier frequency band.It should be noted that, first carrier frequency band can pre-set before ONU transmits data, it is also possible to distribute dynamically when ONU transmits data.
Specifically, with reference to the refinement high-level schematic functional block diagram that Fig. 8, Fig. 8 are the first sending module in Fig. 7, the first sending module 10 includes:
First modulating unit 11, for when multiple optical network units as sender send the first data to multiple optical network unit as recipient, being modulated to sent the first data according to the first carrier frequency band that each described optical network unit as sender is preset respectively；
In the present embodiment, each described optical network unit ONU is all built-in with a manipulator, for instance can be MZM (Mach-ZehnderModulator, Mach increases Dare manipulator).When an ONU needs to send the first data to another ONU, the first data that first will send are modulated by its built-in MZM, are loaded on its preset carrier wave being in first carrier frequency band range by its first data to send.
First transmitting element 12, for the first data through modulating as each described optical network unit of sender are sent to the first beam splitter, for described first beam splitter, each described the first data through ovennodulation received are carried out close the second data to be extracted generated after road processes to send to described optical line terminal, and by described optical line terminal, described second data to be extracted are reflexed to each described optical network unit as recipient.
In the present embodiment, each ONU sends to the first beam splitter after the first data through ovennodulation carry out E/O (electricaltooptical, electro-optic conversion) conversion.Such as, if the quantity of ONU is N number of, then the first beam splitter can be N:1 the first beam splitter.The first data after ovennodulation from each ONU are carried out closing road by the first beam splitter, and finally synthesize a road optical signal (i.e. above-mentioned second data to be extracted), and then described second data to be extracted are sent to OLT by the first beam splitter again.Reflective optical system and uplink sounding device it is provided with in OLT side, for instance, described reflective optical system can be partially reflecting mirror, or is made up of FBG (fiber-brag-grating, Fiber Bragg Grating FBG) and the second beam splitter.After OLT receives described second data to be extracted, distributed into the energy of FBG and the energy of entrance uplink sounding device according to practical situation by the second beam splitter, by FBG, described second data to be extracted received are reflected back in Transmission Fibers, described second data to be extracted through reflection are split at remote node and carry out branch than the optical branching device for 1:N, and send to each ONU side, namely each ONU all receives a described second data to be extracted through reflection.FBG can reflect each up data respectively, and described second data to be extracted of reflection need through processing and amplifying to promote its power, so that it is guaranteed that its power can error free transmission after supporting reflex.
First receiver module 20, for according to the preset described first carrier band reception of each described optical network unit as recipient the first data from the described optical network unit as sender；
It should be noted that, in the present embodiment, different as the described optical network unit of sender or when as the described optical network unit difference of recipient, send between described optical network unit or the described first carrier frequency band that receives data preset is all different.It is to say, for a pair two optical network unit respectively as sender and recipient, transmission frequency band residing for the adopted carrier wave of data is different from another to two optical network units respectively as sender and recipient between.
Specifically, described first receiver module 20 specifically for respectively according to the preset first carrier frequency band of each described optical network unit as recipient in the first data corresponding to described second extracting data to be extracted.
After each ONU receives above-mentioned second data to be extracted, first the second data to be extracted through reflection received are carried out O/E (opticaltoelectrical, opto-electronic conversion) conversion, owing to corresponding first carrier frequency band all differs when each receives data as the ONU of recipient, therefore the first data corresponding to each ONU can be extracted respectively by the first carrier frequency band corresponding to each ONU in ONU side.
The communicator being applied to OFDM-PON provided by the invention, when transmitting data between multiple optical network units, each described optical network unit as sender sends the first data extremely as each described optical network unit of recipient according to preset first carrier frequency band, as each described optical network unit of recipient according to the preset described first carrier band reception the first data from the described optical network unit as sender, it is thus possible to the intercommunication mutually simultaneously realized between many group user terminals, improve the motility of optical network communication and the efficiency of optical network communication and speed, and reduce cost.
Further, carry out upstream or downstream data transmission to realize multiple user terminal simultaneously, and improve the motility of optical network communication further, and improve efficiency and the speed of optical network communication, in or all embodiments a certain in the present invention, it is the high-level schematic functional block diagram that the present invention is applied to communicator second embodiment of OFDM-PON with reference to Fig. 9, Fig. 9, in the present embodiment, this communicator being applied to OFDM-PON also includes:
Second sending module 30, for when multiple optical network units send the second data to optical line terminal, sending the second data to optical line terminal according to the second carrier frequency band that each described optical network unit is preset, preset the second carrier frequency band of each described optical network unit all differs；
Described second carrier frequency band is the frequency band range residing for carrier wave adopted when optical network unit sends the second data to optical line terminal.Preset the second carrier frequency band of each optical network unit above-mentioned can be configured according to actual needs, preset the second carrier frequency band of each optical network unit is not overlapping each other, thus when optical line terminal receives the second data sent from each optical network unit, it is possible to the second data sent corresponding to each optical network unit are extracted according to the second carrier frequency band.It should be noted that, the second carrier frequency band can pre-set before ONU transmits data, it is also possible to distribute dynamically when ONU transmits data.
Specifically, a certain in the present invention or in all embodiments, with reference to the refinement high-level schematic functional block diagram that Figure 10, Figure 10 are the second sending module in Fig. 9, the second sending module 30 includes:
Second modulating unit 31, for when multiple optical network units send the second data to optical line terminal, being modulated to sent the second data according to the second carrier frequency band that each described optical network unit is preset respectively；
In the present embodiment, each described optical network unit ONU is all built-in with a manipulator, for instance can be MZM (Mach-ZehnderModulator, Mach increases Dare manipulator).When each ONU needs to send uplink data or VPN data (i.e. above-mentioned second data), the uplink data that first will send or VPN data are modulated by its built-in MZM, are loaded on its preset carrier wave being in the second carrier frequency band scope by its uplink data to send or VPN data.
Second transmitting element 32, the second data for modulating through each described optical network unit send to the first beam splitter, are undertaken sending to described optical line terminal after conjunction road processes by the second data through ovennodulation from each described optical network unit for described first beam splitter.
In the present embodiment, each ONU sends to the first beam splitter after the second data through ovennodulation carry out E/O (electricaltooptical, electro-optic conversion) conversion.Such as, if the quantity of ONU is N number of, then the first beam splitter can be N:1 the first beam splitter.The second data after ovennodulation from each ONU are carried out closing road and process by the first beam splitter, and finally synthesize a road optical signal, and then the optical signal behind the first beam splitter Zai Jianghe road sends to OLT.After optical signal after OLT side joint receives above-mentioned conjunction road, first the optical signal received is carried out O/E (opticaltoelectrical, opto-electronic conversion) conversion, to generate the signal of telecommunication after closing road, OLT side is provided with uplink sounding device, receives the signal of telecommunication after closing road by uplink sounding device.Owing to what each ONU sent all differs through the second carrier frequency band corresponding to the second data of ovennodulation, therefore the second data corresponding to each ONU can be extracted respectively by the second carrier frequency band corresponding to each ONU at optical line terminal.Therefore, the communication means that the present embodiment provides, it is capable of multiple optical network unit and sends data to optical line terminal simultaneously, namely the transmitting uplink data of multiple user terminal it is capable of, it is effectively improved the motility of optical network communication, improve efficiency and the speed of optical network communication, and reduce cost.
Second receiver module 40, during for receiving three data from described optical line terminal at multiple optical network units, receives the first data to be extracted that described optical line terminal sends according to the 3rd carrier frequency band that each optical network unit is preset；
Described 3rd carrier frequency band is frequency band range corresponding when optical network unit extracts from three data of optical line terminal.Preset the 3rd carrier frequency band of each optical network unit above-mentioned can be configured according to actual needs, preset the 3rd carrier frequency band of each optical network unit is not overlapping each other, thus when each optical network unit receives three data from optical line terminal transmission, it is possible to the 3rd data sent corresponding to optical line terminal are extracted according to the 3rd carrier frequency band.It should be noted that, the 3rd carrier frequency band can pre-set before OLT transmits data, it is also possible to distribute dynamically when OLT transmits data.
In the present embodiment, when OLT needs to send respectively and organizes down link data (i.e. above-mentioned 3rd data) to multiple ONU more, wherein, each ONU correspondence receives one the 3rd data, first each the 3rd data are modulated according to the 3rd preset for the ONU carrier frequency band corresponding with the 3rd data respectively in OLT side, then each carry out close road again after the 3rd data of ovennodulation carry out E/O conversion process, first data to be extracted described in final conjunction Lu Weiyi road, described first data to be extracted are sent by OLT, first data to be extracted are after fiber-optic transfer, it is split at remote node and carries out branch than the optical branching device for 1:N, and send to each ONU, namely each ONU all receives a described first data to be extracted.
Extraction module 50, for respectively according to preset the 3rd carrier frequency band of each optical network unit in the 3rd data corresponding to described first extracting data to be extracted, preset the 3rd carrier frequency band of each described optical network unit all differs.
After each ONU receives the first data to be extracted, first the receive first data to be extracted are carried out O/E (opticaltoelectrical, opto-electronic conversion) conversion, OUN side is provided with downlink probe device, receives the first data to be extracted by downlink probe device.The 3rd carrier frequency band corresponding during due to each ONU downlink data receiving all differs, and therefore can extract the 3rd data corresponding to each ONU respectively by the 3rd carrier frequency band corresponding to each ONU in ONU side.
The communicator being applied to OFDM-PON provided by the invention, when multiple optical network units send the second data to optical line terminal, each described optical network unit sends the second data to optical line terminal according to the second preset carrier frequency band, it is capable of multiple optical network unit and sends data to optical line terminal simultaneously, be namely capable of the transmitting uplink data of multiple user terminal；When multiple optical network units receive three data from described optical line terminal, each optical network unit receives the first data to be extracted that described optical line terminal sends according to the 3rd carrier frequency band that each optical network unit is preset, each optical network unit respectively according to preset the 3rd carrier frequency band of each optical network unit in the 3rd data corresponding to described first extracting data to be extracted, it is capable of multiple optical network unit and receives the data from optical line terminal simultaneously, be namely capable of the downlink data transmission of multiple user terminal.The communication means of the OFDM-PON of being applied to provided by the invention is effectively improved the motility of optical network communication, improves efficiency and the speed of optical network communication, and reduces cost.
It should be noted that, above-mentioned first sending module 10 and the second sending module 30 can be same module, above-mentioned first receiver module 20 and the second receiver module 40 can be same module.
Specifically, based on above-described embodiment, with reference to Fig. 5 and Fig. 6, illustrate arranging n ONU below.Each ONU presets different first carrier frequency bands, the frequency band of the carrier occupancy different (not overlapping) that different ONU users adopt when sending data, as shown in Figure 5 and Figure 6, for i-th ONU end ONUi, when it is as transmitting terminal, the carrier frequency band being correspondingly arranged is λi, for frequency band λi, it is further subdivided into n sub-band, is set to λi-1…λi-k…λi-n, wherein, λi-kRepresent that ONUi is as transmitting terminal, and ONUk as receiving terminal time frequency band range shared by adopted carrier wave.Should be noted that, if not carrying out VPN traffic between two ONU end of synchronization, then corresponding first carrier frequency band can be reassigned to other ONU end and carries out VPN traffic, and the number of first carrier frequency band can adjust dynamically according to actual needs flexibly.
When ONUk receives the data from the reflection of OLT end as receiving terminal, ONUk receives the whole signal from OLT end, this signal packet is containing all of VPN signal, it is only necessary to extract the data corresponding to first carrier frequency band that this ONUk end is preset in the received data.
Should be noted that, above-mentioned uplink data, down link data and VPN data realize the mutual conversion between binary data and OFDM data before being transmitted or afterwards by Digital Signal Processing, and the computing of this process includes: serioparallel exchange S-P, parallel-serial conversion P-S, Fourier transformation FFT, inversefouriertransform IFFT, mapping Mapping, digital-to-analogue conversion ADC, analog digital conversion DAC, insertion and removal Cyclic Prefix Cyclicprefix and balanced Equalization.
The present invention further provides a kind of communication system being applied to OFDM-PON, described communication system includes optical line terminal, some optical network units and the Optical Distribution Network being connected between described optical line terminal and each described optical network unit, and described optical line terminal includes reflecting module；Described Optical Distribution Network includes the first beam splitter；Described optical network unit includes the first sending module and the first receiver module；When transmitting data between multiple optical network units, described first sending module is for sending the first data extremely described first beam splitter according to the first carrier frequency band that each described optical network unit as sender is preset；Described first beam splitter is for being undertaken closing road by the first data received, and to generate the second data to be extracted, and sends the second data to be extracted generated to described reflecting module；Described reflecting module is for reflexing to described first beam splitter by the second data to be extracted received；Described first beam splitter is additionally operable to carry out the second data to be extracted received sending after light splitting to each described optical network unit as recipient；Described first receiver module is for according to the preset described first carrier band reception of each described optical network unit as recipient the first data from the described optical network unit as sender；Wherein, different as the described optical network unit of sender or when as the described optical network unit difference of recipient, send between described optical network unit or the described first carrier frequency band that receives data preset is all different.
Further, described optical network unit also includes the second sending module, the second receiver module and extraction module, when multiple optical network units send the second data to described optical line terminal, described second sending module is for sending the second data extremely described first beam splitter according to the second carrier frequency band that each described optical network unit is preset, wherein, the second carrier frequency band that each described optical network unit is preset all differs；Described first beam splitter is additionally operable to the second data that will receive, or the second data and the first data carry out closing behind road and send to described optical line terminal；When described optical line terminal sends the 3rd data to multiple optical network unit, described optical line terminal sends the first data to be extracted extremely described first beam splitter according to the 3rd carrier frequency band that each described optical network unit is preset；Described first beam splitter sends the second receiver module to each described optical network unit after the first data to be extracted received are carried out light splitting；Described second receiver module is used for receiving described first data to be extracted；Described extraction module, for respectively according to preset the 3rd carrier frequency band of each optical network unit in the 3rd data corresponding to described first extracting data to be extracted, preset the 3rd carrier frequency band of each described optical network unit all differs.
Further, described second sending module includes: the second modulating unit, for when multiple optical network units send the second data to optical line terminal, being modulated to sent the second data according to the second carrier frequency band that each described optical network unit is preset respectively；Second transmitting element, the second data for modulating through each described optical network unit send to the first beam splitter, send to described optical line terminal after the second data through ovennodulation from each described optical network unit being carried out conjunction road for described first beam splitter.
Further, described first sending module includes: the first modulating unit, for when multiple optical network units as sender send the first data to multiple optical network unit as recipient, being modulated to sent the first data according to the first carrier frequency band that each described optical network unit as sender is preset respectively；First transmitting element, for the first data through modulating as each described optical network unit of sender are sent to described first beam splitter, undertaken closing road by each described the first data through ovennodulation received for described first beam splitter, to generate the second data to be extracted, and the second data to be extracted generated are sent to described reflecting module.
It should be noted that, above-mentioned first sending module and the second sending module can be same module, above-mentioned first receiver module and the second receiver module can be same module.
Further, described first receiver module specifically for respectively according to the preset first carrier frequency band of each described optical network unit as recipient in the first data corresponding to described second extracting data to be extracted.
It should be noted that, the structure based on the optical network unit in the communication system of OFDM-PON, optical line terminal and Optical Distribution Network that the present embodiment provides is referred to each embodiment above-mentioned, do not repeat them here.Wherein, the luminous reflectance module of optical line terminal is the reflective optical system in above-described embodiment, and Optical Distribution Network is the optical transmission pathway between optical network unit and optical line terminal, and the first beam splitter of Optical Distribution Network is the optical branching device in above-described embodiment.
The communication system based on OFDM-PON that the present embodiment provides, by arranging luminous reflectance module, and luminous reflectance module can be partially reflecting mirror, or be made up of FBG and the second beam splitter, so that both can have been sent to reflecting module by the data of ONU transmission to OLT, for reflecting module, the data division of reception is reflexed to ONU, to realize the communication between each ONU；It is also possible that part is sent to uplink receiver by reflecting module while that ONU sending the data to OLT, send to ancillary equipment for the OLT data that uplink receiver is received, thus the communication realized between each ONU and ancillary equipment.
These are only the preferred embodiments of the present invention; not thereby the scope of the claims of the present invention is limited; every equivalent structure utilizing description of the present invention and accompanying drawing content to make or equivalence flow process conversion; or directly or indirectly it is used in other relevant technical fields, all in like manner include in the scope of patent protection of the present invention.

Claims (15)

1. the communication means being applied to OFDM-PON, it is characterised in that described communication means comprises the following steps:
When transmitting data between multiple optical network units, each described optical network unit as sender sends the first data extremely as each described optical network unit of recipient according to preset first carrier frequency band；
As each described optical network unit of recipient according to the preset described first carrier band reception the first data from the described optical network unit as sender；
Wherein, different as the described optical network unit of sender or when as the described optical network unit difference of recipient, send between described optical network unit or the described first carrier frequency band that receives data preset is all different.
2. communication means as claimed in claim 1, it is characterised in that described communication means is further comprising the steps of:
When multiple optical network units send the second data to optical line terminal, each described optical network unit sends the second data to optical line terminal according to the second preset carrier frequency band, and preset the second carrier frequency band of each described optical network unit all differs；
When multiple optical network units receive three data from described optical line terminal, each optical network unit receives the first data to be extracted that described optical line terminal sends according to the 3rd carrier frequency band that each optical network unit is preset；
Each optical network unit respectively according to preset the 3rd carrier frequency band of each optical network unit in the 3rd data corresponding to described first extracting data to be extracted, preset the 3rd carrier frequency band of each described optical network unit all differs.
3. communication means as claimed in claim 2, it is characterized in that, described when multiple optical network units send the second data to optical line terminal, each described optical network unit sends the second data to the step of optical line terminal according to the second preset carrier frequency band and includes:
When multiple optical network units send the second data to optical line terminal, each described optical network unit is modulated to sent the second data according to the second preset carrier frequency band respectively；
The second data through ovennodulation are sent to the first beam splitter by each described optical network unit, are undertaken sending to described optical line terminal after conjunction road processes by the second data through ovennodulation from each described optical network unit for described first beam splitter.
4. communication means as claimed in claim 2, it is characterized in that, described when transmitting data between multiple optical network units, send the first data as each described optical network unit of sender according to preset first carrier frequency band and include to the step of each described optical network unit as recipient:
When multiple optical network units as sender send the first data to multiple optical network unit as recipient, each described optical network unit as sender is modulated to sent the first data according to preset first carrier frequency band respectively；
The first data through ovennodulation are sent to the first beam splitter by each described optical network unit as sender, the second data to be extracted generated after each described the first data through ovennodulation received being carried out conjunction road for described first beam splitter send to described optical line terminal, and by described optical line terminal, described second data to be extracted are reflexed to each described optical network unit as recipient.
5. communication means as claimed in claim 4, it is characterised in that the described each described optical network unit as recipient includes from the step of the first data of the described optical network unit as sender according to preset described first carrier band reception:
As recipient each described optical network unit respectively according to the preset first carrier frequency band of each described optical network unit as recipient in the first data corresponding to described second extracting data to be extracted.
6. the communicator being applied to OFDM-PON, it is characterised in that described communicator includes:
First sending module, during for transmitting data between multiple optical network units, sends the first data extremely as each described optical network unit of recipient according to the first carrier frequency band that each described optical network unit as sender is preset；
First receiver module, for according to the preset described first carrier band reception of each described optical network unit as recipient the first data from the described optical network unit as sender；
Wherein, different as the described optical network unit of sender or when as the described optical network unit difference of recipient, send between described optical network unit or the described first carrier frequency band that receives data preset is all different.
7. communicator as claimed in claim 6, it is characterised in that described communicator also includes:
Second sending module, for when multiple optical network units send the second data to optical line terminal, sending the second data to optical line terminal according to the second carrier frequency band that each described optical network unit is preset, preset the second carrier frequency band of each described optical network unit all differs；
Second receiver module, during for receiving three data from described optical line terminal at multiple optical network units, receives the first data to be extracted that described optical line terminal sends according to the 3rd carrier frequency band that each optical network unit is preset；
Extraction module, for respectively according to preset the 3rd carrier frequency band of each optical network unit in the 3rd data corresponding to described first extracting data to be extracted, preset the 3rd carrier frequency band of each described optical network unit all differs.
8. communicator as claimed in claim 7, it is characterised in that described second sending module includes:
Second modulating unit, for when multiple optical network units send the second data to optical line terminal, being modulated to sent the second data according to the second carrier frequency band that each described optical network unit is preset respectively；
Second transmitting element, the second data for modulating through each described optical network unit send to the first beam splitter, are undertaken sending to described optical line terminal after conjunction road processes by the second data through ovennodulation from each described optical network unit for described first beam splitter.
9. communicator as claimed in claim 7, it is characterised in that described first sending module includes:
First modulating unit, for when multiple optical network units as sender send the first data to multiple optical network unit as recipient, being modulated to sent the first data according to the first carrier frequency band that each described optical network unit as sender is preset respectively；
First transmitting element, for the first data through modulating as each described optical network unit of sender are sent to the first beam splitter, the second data to be extracted generated after each described the first data through ovennodulation received being carried out conjunction road for described first beam splitter send to described optical line terminal, and by described optical line terminal, described second data to be extracted are reflexed to each described optical network unit as recipient.
10. communicator as claimed in claim 9, it is characterised in that described first receiver module specifically for respectively according to the preset first carrier frequency band of each described optical network unit as recipient in the first data corresponding to described second extracting data to be extracted.
11. be applied to a communication system of OFDM-PON, described communication system includes optical line terminal, some optical network units and the Optical Distribution Network being connected between described optical line terminal and each described optical network unit, it is characterised in that
Described optical line terminal includes reflecting module；
Described Optical Distribution Network includes the first beam splitter；
Described optical network unit includes the first sending module and the first receiver module；
When transmitting data between multiple optical network units, described first sending module is for sending the first data extremely described first beam splitter according to the first carrier frequency band that each described optical network unit as sender is preset；
Described first beam splitter is for being undertaken closing road by the first data received, and to generate the second data to be extracted, and sends the second data to be extracted generated to described reflecting module；
Described reflecting module is for reflexing to described first beam splitter by the signal section of reception；
Described first beam splitter is additionally operable to carry out the second data to be extracted received sending after light splitting to each described optical network unit as recipient；
Described first receiver module is for according to the preset described first carrier band reception of each described optical network unit as recipient the first data from the described optical network unit as sender；
Wherein, different as the described optical network unit of sender or when as the described optical network unit difference of recipient, send between described optical network unit or the described first carrier frequency band that receives data preset is all different.
12. communication system as claimed in claim 11, it is characterised in that
Described optical network unit also includes the second sending module, the second receiver module and extraction module,
When multiple optical network units send the second data to described optical line terminal, described second sending module is for sending the second data extremely described first beam splitter according to the second carrier frequency band that each described optical network unit is preset, wherein, the second carrier frequency band that each described optical network unit is preset all differs；
Described first beam splitter is additionally operable to the second data that will receive, or the second data and the first data carry out closing behind road and send to described optical line terminal；
When described optical line terminal sends the 3rd data to multiple optical network unit, described optical line terminal sends the first data to be extracted extremely described first beam splitter according to the 3rd carrier frequency band that each described optical network unit is preset；
Described first beam splitter sends the second receiver module to each described optical network unit after the first data to be extracted received are carried out light splitting；
Described second receiver module is used for receiving described first data to be extracted；
Described extraction module, for respectively according to preset the 3rd carrier frequency band of each optical network unit in the 3rd data corresponding to described first extracting data to be extracted, preset the 3rd carrier frequency band of each described optical network unit all differs.
13. communication system as claimed in claim 12, it is characterised in that
Described second sending module includes:
Second modulating unit, for when multiple optical network units send the second data to optical line terminal, being modulated to sent the second data according to the second carrier frequency band that each described optical network unit is preset respectively；
Second transmitting element, the second data for modulating through each described optical network unit send to the first beam splitter, send to described optical line terminal after the second data through ovennodulation from each described optical network unit being carried out conjunction road for described first beam splitter.
14. communication system as claimed in claim 13, it is characterised in that
Described first sending module includes:
First modulating unit, for when multiple optical network units as sender send the first data to multiple optical network unit as recipient, being modulated to sent the first data according to the first carrier frequency band that each described optical network unit as sender is preset respectively；
First transmitting element, for the first data through modulating as each described optical network unit of sender are sent to described first beam splitter, undertaken closing road by each described the first data through ovennodulation received for described first beam splitter, to generate the second data to be extracted, and the second data to be extracted generated are sent to described reflecting module.
15. communication system as claimed in claim 14, it is characterised in that described first receiver module specifically for respectively according to the preset first carrier frequency band of each described optical network unit as recipient in the first data corresponding to described second extracting data to be extracted.
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