CN1980098B - Wave-division multi-plexing light accessing system and data receiving-transmitting method - Google Patents
Wave-division multi-plexing light accessing system and data receiving-transmitting method Download PDFInfo
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Abstract
The system is composed of light route terminals, far end nodes, and multiple light network units. Light source units at light route terminals provide a wide spectroscopic light source. After segmenting spectral lines of the said wide spectroscopic light source, the system sends it to down going modulated wave locked light source so as to provide light signal of seed wave for sending down going data from light route terminals. Optical network unit inputs down going light signal, which is from light route terminals and demultiplexed by far end nodes, to up going modulated wave locked light source so as to provide light signal of seed wave for ONU up going data. Using a wide spectroscopic light source in low cost, the invention provides light source for system to send out up going and down going data. Advantages are: reducing system cost, saving resources of wavelength since identical wavelength is adopted for sending up going and down going data.
Description
Technical field
The present invention relates to light access technology field, relate to a kind of Wave-division multi-plexing light accessing system and data receiving-transmitting method thereof particularly.
Background technology
At present, many Internet services respectively the dialing modem of through-rates from 56Kbps to several Mbps, asymmetric digital line subscribers feeder, cable modem, very-high-bit-rate digital subscriber loop (Very-high-bit-rate Digital Subscriber Loop, VDSL) etc. mode inserts.But, for various video traffics are provided, as high-quality video information business etc., the transmission of data approximately requires to have the bandwidth of 100Mbps, can't satisfy this requirement with above-mentioned several access waies, therefore, increase rapidly with the demand of optical fibre installation Access Network.(Passive Optical Network PON) a kind ofly just can satisfy these new business demands to EPON, again economy and operation maintenance user access networks easily.As shown in Figure 1, an EPON generally comprises an optical line terminal that is positioned at the central office, an optical distribution network and many optical network unit (Optical Network Unit, ONU), difference according to the PON realization, PON can be divided into different types, and (Wavelength Divided MultiplexingPassive Optical Network WDM-PON) is wherein a kind of to Wave division multiplexing passive optical network.
WDM-PON has the Information Security of huge bandwidth capacity, similarity point to-point communication, simple network configuration, cheap advantages such as maintenance cost.But, on the other hand, WDM-PON network devices costliness, cost is high always.WDM-PON proposes the laser that initial stage ONU adopts One's name is legion and wavelength to have nothing in common with each other, but can cause the storage amount of laser and ONU big like this, be unfavorable for the decline of operation maintenance and ONU cost, in order to solve above-mentioned deficiency, the low cost optical source technology scheme of numerous replacement laser with fixed wavelength has appearred; Simultaneously, in order to solve the problem that ONU can not be general, a kind of solution of colorless ONU has been proposed.So-called colorless ONU, the up wavelength that just is meant ONU be can't help the decision of ONU self hardware, but provide the seed wavelength light signal of specific wavelength for ONU by optical line terminal, the wavelength of this seed wavelength light signal is locked the wavelength of the laser on the ONU or ONU reflects amplification to this seed wavelength light signal, utilize behind the wavelength locking or the laser transmission upstream data of reflection after amplifying, like this up wavelength of ONU just will with the hardware independent of ONU self, thereby make that ONU can be general.
As shown in Figure 2, be the existing a kind of system architecture of WDM-PON cheaply schematic diagram based on above-mentioned principle.In this technical scheme, wherein wide spectrum light source 2 provides light source for the transmission of the downlink data of optical line terminal, wide spectrum light source 1 provides light source for the transmission of the upstream data of ONU, wherein, these two wide spectrum light sources must satisfy array waveguide grating (Arrayed Waveguides Grating, AWG) 1 and free spectral range (Free Spectral Range, requirement FSR) of array waveguide grating 2.Wherein, after the wide range light of wide spectrum light source 2 outputs is cut apart through the spectral line of AWG1, the seed wavelength light signal of each descending lock glistening light of waves source output different wave length of OLT will be respectively, to lock or reflect the seed wavelength light signal (λ 1～λ n) that amplifies input as the descending lock glistening light of waves source among Fig. 2, and export the laser that is used for transmitting downlink data, the while can directly be modulated to downlink data on this laser signal and send.The transmission of the transmission of the upstream data of ONU and the downlink data of optical line terminal is similar, and the wavelength of wavelength and the seed wavelength light signal in the descending lock glistening light of waves of input source of seed wavelength light signal that difference is to import the up lock glistening light of waves source of each ONU has differed FSR.
This technical scheme utilizes the spectral line of wide spectrum light source, AWG cheaply to cut apart FSR periodic characteristic and the lock glistening light of waves source of characteristic, AWG, realized only using two wide spectrum light sources just the purpose of light source is provided for entire WDM-PON system, reduced the cost of whole system, but this technical scheme also has the following disadvantages:
In this technical scheme, wide spectrum light source 1 and wide spectrum light source 2 must satisfy the requirement of the FSR of AWG1 and AWG2, and this specific (special) requirements will increase the cost of wide spectrum light source.
In addition, in this technical scheme, the wavelength emission that the uplink and downlink The data is different has taken more wavelength resource.
Summary of the invention
Technical problem to be solved by this invention is, a kind of Wave-division multi-plexing light accessing system is provided, use one cheaply the wide spectrum light source downlink data that is embodied as optical line terminal send and the upstream data transmission of ONU provides seed wavelength light signal and the identical wavelength emission of uplink and downlink The data.
In order to solve the problems of the technologies described above, the present invention proposes a kind of Wave-division multi-plexing light accessing system, the distant-end node that comprises optical line terminal, is connected with optical fiber with optical line terminal, and a plurality of optical network units that are connected with optical fiber with distant-end node; Wherein, described optical line terminal includes descending modulate emission unit, up receiving element and light source cell, and described descending modulate emission unit includes a plurality of descending modulating lock glistening lights of waves source; Described distant-end node includes the tri-array waveguide optical grating; Each optical network unit comprises up modulate emission unit and descending receiving element, and described up modulate emission unit includes up modulating lock glistening light of waves source; Wherein:
Described light source cell includes a wide spectrum light source, and the wide range light signal of its generation produces seed wavelength light signal after spectral line is cut apart;
The described seed wavelength of described descending modulate emission unit by using light signal generating downlink optical signal is carried on described downlink optical signal and emission with downlink data;
Described optical network unit receives the downlink optical signal that comes from described optical line terminal through described tri-array waveguide optical grating, the described downlink optical signal of described up modulate emission unit by using produces uplink optical signal, and upstream data is carried on described uplink optical signal and emission.
Wherein, described optical line terminal also includes: emission controlling unit, be used for presence according to described optical network unit, and control the descending modulating lock glistening light of waves source corresponding and send the corresponding downstream light signal with described optical network unit.
Described descending modulate emission unit also includes: a plurality of coding units are used for the return-to-zero coding of reversing respectively of multichannel downlink data is sent to corresponding described a plurality of descending modulating lock glistening light of waves source then respectively.
Correspondingly, the invention provides a kind of data receiving-transmitting method of Wave-division multi-plexing light accessing system, this method may further comprise the steps:
The wide range light of a, wide spectrum light source output transfers to each descending modulating lock glistening light of waves source respectively as seed wavelength light signal after spectral line is cut apart;
The descending modulating lock glistening light of waves source that b, optical line terminal are controlled each optical network unit correspondence according to the state status of each optical network unit sends the corresponding downstream light signal;
C, optical network unit are with the downlink optical signal separated into two parts that receives, and a part is used to recover downlink data, and another part transfers to its up modulating lock glistening light of waves source as seed wavelength light signal;
Launch and the identical light signal of described seed wavelength light signal wavelength in d, described up modulating lock glistening light of waves source, and upstream data is modulated on the described light signal sends.
Implement the present invention, have following beneficial effect:
The present invention proposes a kind of Wave-division multi-plexing light accessing system and data receiving-transmitting method thereof, the light source cell of optical line terminal provides a wide spectrum light source, the wide range light signal that it sends is sent into descending modulating lock glistening light of waves source after spectral line is cut apart, for the generation of optical line terminal downlink optical signal provides seed wavelength light signal; The part that optical network unit will come from the downlink optical signal behind the distant-end node demultiplexing of optical line terminal is input to up modulating lock glistening light of waves source, for the transmission of ONU upward signal provides seed wavelength light signal, thereby realized using a low-cost wide range light source to send the purpose that light source is provided, reduced system cost as the uplink and downlink signal of system; Simultaneously, what adopt when sending owing to the uplink and downlink signal is identical wavelength, makes system save wavelength resource.
Description of drawings
Fig. 1 is that the system of EPON in the prior art forms schematic diagram;
Fig. 2 is that the system of WDM-PON in the prior art forms schematic diagram;
Fig. 3 is the composition schematic diagram of Wave-division multi-plexing light accessing system among the present invention;
Fig. 4 is the light signal schematic diagram of exporting when among the present invention downlink data being adopted nrz encoding;
Fig. 5 is the light signal schematic diagram of output when among the present invention downlink data being adopted the IRZ coding;
Fig. 6 is the schematic flow sheet of the data receiving-transmitting method of Wave-division multi-plexing light accessing system among the present invention;
Fig. 7 is the concrete steps schematic flow sheet of step S6002 among Fig. 6.
Embodiment
Below in conjunction with accompanying drawing the present invention is done further in detail clearly explanation.
Fig. 3 shows the composition schematic diagram of Wave-division multi-plexing light accessing system among the present invention.This system is made up of optical line terminal 1, distant-end node 2 and a plurality of optical network unit 3.Optical line terminal 1 is with modulation of multichannel downlink data and emission, simultaneously it is multiplexed into a down mixing light signal and sends to distant-end node 2, distant-end node 2 demultiplexes into this down mixing light signal the multichannel wavelength optical signals and sends each corresponding optical network unit 3 respectively to; Simultaneously, the upstream data modulation that optical network unit 3 will send also sends to distant-end node 2, and distant-end node 2 is multiplexed into up mixed light signal with it and is sent to optical line terminal 1.Thus, the uplink and downlink data of having finished system transmit.
Distant-end node 2 includes tri-array waveguide optical grating 21, it receives the down mixing light signal that optical line terminal 1 sends, and it is demultiplexed into n wavelength optical signals λ 1～λ n, transmission advances in n the corresponding optical network unit 3 to carry out demodulation process respectively, simultaneously the seed wavelength light signal that also sends as upstream data.
The light signal that the tri-array waveguide optical grating 21 of distant-end node 2 sends each optical network unit 3 is multiplexed into up mixed light signal and is sent to the up receiving element 12 of optical line terminal 1.
Up receiving element 12 includes second array waveguide grating 121 and a plurality of demodulating unit 122.Second array waveguide grating 121 demultiplexes into the light signal λ 1～λ n that carries upstream data of a plurality of different wave lengths with up wavelength-division-multiplexed optical signal, and imports n demodulating unit 122 respectively and carry out opto-electronic conversion and demodulation process.
Be convenience two-way transmission light signal in an optical fiber, as a kind of execution mode, optical line terminal 1 also includes first circulator 14 and second circulator 15.First circulator 14 be used for from the optical signal transmission of described light source cell 13 to descending modulate emission unit 11, receive from the downlink optical signal of descending modulate emission unit 11 and transmit it to second circulator 15.Second circulator 15 receives from the downlink optical signal of first circulator 14 and transfers to described distant-end node 2, receives from the uplink optical signal of distant-end node 2 and transmits it to up receiving element 12.
In actual applications, for making the luminous power of downlink optical signal after the process long-distance transmissions greater than the up modulating lock glistening light of waves of ONU source 311 desired minimum thresholds, usually the downlink optical signal to 11 outputs of descending modulate emission unit carries out light amplification, therefore, optical line terminal 1 also includes image intensifer 17, between first circulator 14 and second circulator 15, be used for the down mixing light signal is amplified.
In sum as can be known, the downlink optical signal that has carried downlink data in the present invention can be used as the seed wavelength light signal in the up modulating lock glistening light of waves of ONU source 311.Because optical network unit 3 self does not produce the laser that sends the required specific wavelength of upstream data, the up modulating lock glistening light of waves of ONU source 311 only could be exported the laser of the specific wavelength that is used to send upstream data under greater than the situation of minimum threshold in the luminous power that injection light (seed wavelength light signal) and seed wavelength light signal are arranged.If 112 pairs of downlink datas of the coding unit of optical line terminal 1 adopt general non-return-to-zero coding (Not Return to Zero, NRZ), as shown in Figure 4, then when the downlink data bit is " 0 ", descending modulating lock glistening light of waves source 111 (or has only very low power light output with unglazed output, relevant with extinction ratio), at this moment, the luminous power of injecting the seed wavelength light signal in the up modulating lock glistening light of waves of ONU source 311 will be lower than its required minimum threshold and cause not having laser output.Therefore, optical network unit 3 can only could be modulated into upstream data (just there was laser output in up modulating lock glistening light of waves source 311 when the downlink data bit was " 1 ") when the downlink data bit is " 1 ", thereby makes the transmission of the upstream data of optical network unit 3 become very difficult.In order to address this problem, among the present invention, 112 pairs of downlink datas of the coding unit of optical line terminal 1 adopt a kind of counter-rotating NRZ (Inverse Return to Zero that is called, IRZ) coded system, as shown in Figure 5, when making that by coding the descending modulating lock glistening light of waves source 111 of optical line terminal 1 is " 0 " or " 1 " regardless of the downlink data bit, enough strong laser output is all arranged, making the up modulating lock glistening light of waves of ONU source 311 no matter the downlink data bit is " 0 " or " 1 " all has laser to export, is " 0 " or " 1 " thereby make the transmission of upstream data not be subject to the downlink data bit.
In addition, because the generation of the uplink optical signal of optical network unit 3 depends on having or not of downlink data, when a certain descending modulating lock glistening light of waves source 111 does not have downlink data to send, it sends idle frame to need control, for its pairing optical network unit 3 provides seed wavelength light signal, to realize the transmission of its upstream data, up to its off-line.In addition, because optical network unit 3 no light sources own, reach the standard grade in time finding optical network unit 3, during optical network unit 3 off-lines, the descending modulating lock glistening light of waves source 111 of these optical network unit 3 correspondences must periodically send the discovery frame, thereby provides seed wavelength light signal for optical network unit 3 sends the network insertion request to optical line terminal 1.
Therefore, in the practical application, optical line terminal 1 also further comprises emission controlling unit 16, as shown in Figure 3, the descending modulating lock glistening light of waves source 111 that is used for controlling its correspondence according to the online situation of optical network unit 3 in time sends with the upstream data that guarantees optical network unit 3 to its transmission corresponding downstream light signal.This emission controlling unit 16 further includes detecting unit 161 and control unit 162.Detecting unit 161 be used to detect descending modulating lock glistening light of waves source whether have downlink data to send and optical network unit 3 whether online, and testing result sent to control unit 162; Control unit 162 is used for generating control command to the descending modulating lock glistening light of waves source 111 corresponding with optical network unit 3 according to described testing result; When testing result is online and has downlink data to send, control it and send the wavelength-division-multiplexed optical signal that carries downlink data to this optical network unit 3; When testing result is online but the descending modulating lock glistening light of waves source 111 of these optical network unit 3 correspondences when not having downlink data to send, control unit 162 controls should descending modulating lock glistening light of waves source 111 transmission idle frame signals; When testing result is off-line, controls it and send the discovery frame to this optical network unit 3.The transmission of finding frame can be periodic, and cycle length can for example, can be several seconds or a few minutes according to user's needs setting.
Detecting unit 161 detect optical network unit 3 whether online execution mode have multiplely, be the example explanation only here with a kind of preferred implementation.In this better embodiment, when reaching the standard grade, optical network unit 3 can send the network insertion request message to optical line terminal 1, can send the off-line notification message to optical line terminal 1 during its normal off-line.Detecting unit 161 links to each other with up receiving element 12, and when it found that up receiving element 12 receives the network insertion request that a certain optical network unit 3 sends over, just the state recording with this optical network unit 3 was online, notifies control unit 162 simultaneously; Equally, when it finds that up receiving element 12 receives the off-line notice that a certain optical network unit 3 sends over, just with the state recording of this optical network unit 3 for not online, notify control unit 162 simultaneously.For the situation of optical network unit 3 improper off-lines, another detection mode is arranged: in up receiving element 12, the timer that corresponds respectively to each optical network unit 3 is arranged; The signal that in the upward signal that up receiving element 12 is found to be received, does not have a certain optical network unit 3 to be sent, then start the timer of these optical network unit 3 correspondences, if up receiving element 12 can not receive the light signal of this optical network unit 3 in the time that timer is preset always, then detecting unit 161 is just thought this optical network unit 3 off-line, for not online, notify control unit 162 with its state recording simultaneously.In addition, detecting unit is also monitored the transmission buffering area in each the descending modulating lock glistening light of waves source in the descending modulate emission unit in real time, when detect optical network unit 3 online but its send when downlink data to be sent such as not having in buffering area, to notify control unit 162 to fill the idle frame data in the buffering area, send descending idle frame thereby control descending modulating lock glistening light of waves source toward sending.
In addition, in order to improve the performance that optical line terminal 1 receives the upstream data of optical network unit 3 better, reduce the error rate that upstream data receives, the descending receiving element 32 of optical network unit 3 also includes Clock Extraction unit 321, and described up modulate emission unit 31 also includes and sends lock unit 312.Clock Extraction unit 321 is used for extracting the clock signal of downlink data, and sends to transmission lock unit 312; Send the emission that lock unit 312 is used for controlling according to described clock signal upstream data, so that upstream data sends and downlink optical signal is synchronous.
As a kind of execution mode, wavelength locking F-PLD laser can be adopted with up modulating lock glistening light of waves source 311 in the descending modulating lock glistening light of waves source 111 among the present invention.
As another kind of execution mode, the RSOA laser can be adopted with up modulating lock glistening light of waves source 311 in the descending modulating lock glistening light of waves source 111 among the present invention.
Different lasers can be adopted with up modulating lock glistening light of waves source 311 in descending modulating lock glistening light of waves source 111.
Correspondingly, the invention provides a kind of method that on above-mentioned Wave-division multi-plexing light accessing system, realizes data transmit-receive, as shown in Figure 6.This method may further comprise the steps:
Step S6001: the wide range light of wide spectrum light source output transfers to each descending modulating lock glistening light of waves source respectively as seed wavelength light signal after spectral line is cut apart.
What wide spectrum light source sent is wide range light, and this wide range light produces the laser of narrowband signal of a plurality of different centre wavelengths after spectral line is cut apart, and is input to each descending modulating lock glistening light of waves source respectively as seed wavelength light signal.
Step S6002: the descending modulating lock glistening light of waves source that optical line terminal is controlled its correspondence according to the state status of each optical network unit sends the corresponding downstream light signal.
Descending modulating lock glistening light of waves source locks seed wavelength light signal or reflects amplification, exports and the identical downlink optical signal of this seed wavelength light signal wavelength.But, for the data that make the optical network unit corresponding with it can in time be sent out away, optical line terminal need be controlled descending modulating lock glistening light of waves source according to the difference of the online situation of optical network unit and send different downlink optical signals to optical network unit, being that optical network unit provides its required seed wavelength light signal in time.
As a kind of execution mode, optical line terminal can be multiplexed into the light signal in each descending modulating lock glistening light of waves source downlink optical signal long-distance transmissions on optical fiber of a mixing, and then demultiplexing and be sent to each corresponding optical network unit.
Step S6003: optical network unit is with the downlink optical signal separated into two parts that receives, and a part is used to recover downlink data, and another part transfers to its up modulating lock glistening light of waves source as seed wavelength light signal.
Step S6004: launch and the identical light signal of described seed wavelength light signal wavelength in described up modulating lock glistening light of waves source, and upstream data is modulated on the described light signal sends.
As shown in Figure 7, the step S6002 in the earlier figures 6 specifically may further comprise the steps:
Step S7001: whether optical line terminal detects optical network unit online, if testing result is for being, and execution in step S7002, otherwise, execution in step S7005.
Step S7002: optical line terminal judges whether the described descending modulating lock glistening light of waves source of described optical network unit correspondence has downlink data to send, if judged result is for being, and execution in step S7003, otherwise, execution in step S7004.
Step S7003: optical line terminal is controlled described downlink data after will encoding in described descending modulating lock glistening light of waves source and is modulated on its light signal that sends and launches.
This step also comprises: optical line terminal is to the downlink data return-to-zero coding of reversing.
Step S7004: optical line terminal is controlled described descending modulating lock glistening light of waves source emission idle frame light signal.
Step S7005: optical line terminal is controlled the emission of described descending modulating lock glistening light of waves source and is found the frame light signal.
The discovery frame can periodically be launched, and its cycle length can for example, can be several seconds or a few minutes according to user's needs setting.
Above disclosed only is preferred embodiment of the present invention, can not limit the present invention's interest field certainly with this, and therefore the equivalent variations of doing according to claim of the present invention still belongs to the scope that the present invention is contained.
Claims (13)
1. Wave-division multi-plexing light accessing system, the distant-end node that comprises optical line terminal, is connected with optical fiber with optical line terminal, and a plurality of optical network units that are connected with optical fiber with distant-end node; Wherein, described optical line terminal includes descending modulate emission unit, up receiving element and light source cell, and described descending modulate emission unit includes a plurality of descending modulating lock glistening lights of waves source; Described distant-end node includes the tri-array waveguide optical grating; Each optical network unit comprises up modulate emission unit and descending receiving element, and described up modulate emission unit includes up modulating lock glistening light of waves source; It is characterized in that:
Described light source cell includes a wide spectrum light source, and the wide range light signal of its generation produces seed wavelength light signal after spectral line is cut apart;
The described seed wavelength of described descending modulate emission unit by using light signal generating downlink optical signal is carried on described downlink optical signal and emission with downlink data;
Described optical network unit receives the downlink optical signal that comes from described optical line terminal through described tri-array waveguide optical grating, the described downlink optical signal of described up modulate emission unit by using produces uplink optical signal, and upstream data is carried on described uplink optical signal and emission.
2. Wave-division multi-plexing light accessing system as claimed in claim 1 is characterized in that, described optical line terminal also includes:
Emission controlling unit is used for the presence according to described optical network unit, controls the descending modulating lock glistening light of waves source corresponding with described optical network unit and sends the corresponding downstream light signal.
3. Wave-division multi-plexing light accessing system as claimed in claim 2 is characterized in that described emission controlling unit further comprises detecting unit and control unit, wherein:
Described detecting unit is used to detect the presence of described optical network unit, and testing result is sent to described control unit;
Described control unit is used for according to the control command of described testing result generation to described descending modulating lock glistening light of waves source; When testing result is online and has downlink data etc. to be sent, control described descending modulating lock glistening light of waves source and send the downlink optical signal of having modulated described downlink data; When testing result is off-line, controls described descending modulating lock glistening light of waves source and send discovery frame light signal.
4. Wave-division multi-plexing light accessing system as claimed in claim 3, it is characterized in that, when testing result is online, but when the descending modulating lock glistening light of waves source of described optical network unit correspondence did not have downlink data etc. to be sent, described control unit was controlled described descending modulating lock glistening light of waves source and is sent the idle frame light signal.
5. as each described Wave-division multi-plexing light accessing system of claim 1 to 4, it is characterized in that described optical line terminal also includes first circulator and second circulator, wherein:
Described first circulator is used for optical signal transmission with the output of described wide spectrum light source to described descending modulate emission unit, and is used to receive the downlink optical signal of described descending modulate emission unit output, transmits it to second circulator;
Described second circulator is used to receive described downlink optical signal and transfers to described distant-end node, and is used to receive the uplink optical signal that described distant-end node sends over, and transmits it to described up receiving element.
6. as each described Wave-division multi-plexing light accessing system of claim 1 to 4, it is characterized in that described descending modulate emission unit also includes:
A plurality of coding units are used for the return-to-zero coding of reversing respectively of multichannel downlink data is sent to corresponding described a plurality of descending modulating lock glistening light of waves source then respectively.
7. as each described Wave-division multi-plexing light accessing system of claim 1 to 4, it is characterized in that described descending modulate emission unit includes:
First array waveguide grating, be used for the wide range light signal spectral line of described wide spectrum light source output is divided into a plurality of wavelength optical signals, transfer to corresponding described a plurality of descending modulating lock glistening light of waves source respectively, and be used to receive the downlink optical signal that comes from described a plurality of descending modulating lock glistening lights of waves source, after being multiplexed into a down mixing light signal, it sends out.
8. as each described Wave-division multi-plexing light accessing system of claim 1 to 4, it is characterized in that described up receiving element includes second array waveguide grating and a plurality of demodulating unit, wherein:
Described second array waveguide grating is used to receive the described uplink optical signal that comes from distant-end node, and it is demultiplexed into a plurality of wavelength optical signals, transfers to described a plurality of demodulating unit respectively;
Described demodulating unit is used for the light signal that receives is carried out opto-electronic conversion and demodulation process.
9. as each described Wave-division multi-plexing light accessing system of claim 1 to 4, it is characterized in that described optical network unit includes:
Coupler is used to receive the light signal that comes from described tri-array waveguide optical grating, is divided into two parts light signal, and transfers to the described descending receiving element and the described up modulating lock glistening light of waves source of this optical network unit respectively.
10. as each described Wave-division multi-plexing light accessing system of claim 1 to 4, it is characterized in that described descending receiving element also includes the Clock Extraction unit, described up modulate emission unit also includes the transmission lock unit, wherein:
Described Clock Extraction unit is used for extracting the clock signal of downlink data, and sends to described transmission lock unit;
Described transmission lock unit is used for the emission according to described clock signal control upstream data.
11. the data receiving-transmitting method of a Wave-division multi-plexing light accessing system is characterized in that, this method may further comprise the steps:
The wide range light of a, wide spectrum light source output forms seed wavelength light signal after spectral line is cut apart, and is transferred to each descending modulating lock glistening light of waves source respectively;
The descending modulating lock glistening light of waves source that b, optical line terminal are controlled each optical network unit correspondence according to the state status of each optical network unit sends the corresponding downstream light signal;
C, optical network unit are with the downlink optical signal separated into two parts that receives, and a part is used to recover downlink data, and another part transfers to its up modulating lock glistening light of waves source as seed wavelength light signal;
Launch and the identical light signal of described seed wavelength light signal wavelength in d, described up modulating lock glistening light of waves source, and upstream data is modulated on the described light signal sends.
12. the data receiving-transmitting method of Wave-division multi-plexing light accessing system as claimed in claim 11 is characterized in that, described step b specifically may further comprise the steps:
Whether b1, optical line terminal detect optical network unit online, if testing result is for being, and execution in step b2, otherwise optical line terminal is controlled the descending modulating lock glistening light of waves source emission discovery frame light signal of this optical network unit correspondence;
B2, optical line terminal judge whether the descending modulating lock glistening light of waves source of described optical network unit correspondence has downlink data to send, if judged result is for being, and execution in step b3, otherwise, execution in step b4;
B3, optical line terminal are controlled described downlink data after will encoding in described descending modulating lock glistening light of waves source and are modulated on its light signal that sends and launch;
B4, optical line terminal are controlled described descending modulating lock glistening light of waves source emission idle frame light signal.
13. the data receiving-transmitting method of Wave-division multi-plexing light accessing system as claimed in claim 12 is characterized in that, described step b3 also comprises: described optical line terminal is to the downlink data return-to-zero coding of reversing.
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