CN103108260A - Passive optical network system and uplink optical signal and downlink optical signal transmission method - Google Patents
Passive optical network system and uplink optical signal and downlink optical signal transmission method Download PDFInfo
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- CN103108260A CN103108260A CN2011103566455A CN201110356645A CN103108260A CN 103108260 A CN103108260 A CN 103108260A CN 2011103566455 A CN2011103566455 A CN 2011103566455A CN 201110356645 A CN201110356645 A CN 201110356645A CN 103108260 A CN103108260 A CN 103108260A
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Abstract
The invention discloses a passive optical network system and an uplink optical signal and downlink optical signal transmission method. The passive optical network system comprises an optical link terminal, an optical guiding device, a multi-mode coupler, an optical distribution network and an optical network unit, wherein the optical line terminal is used for sending a downlink optical signal to the optical network unit and receiving an uplink optical signal sent from the optical network unit, the optical guiding device is connected with the optical line terminal and is used for optical guiding of the uplink optical signal and the downlink optical signal, the multi-mode coupler is connected with the optical guiding device and the optical distribution network and is used for distributing the downlink optical signal which is guided by the optical guiding device to the optical distribution and coupling the uplink optical signal to the optical guiding device, the optical distribution network is connected with the multi-mode coupler and the optical network unit and is used for transmitting the downlink optical signal to the optical network unit and transmitting the uplink optical signal to the multi-mode coupler, and the optical network unit is used for receiving the input downlink optical signal and transmitting the uplink optical signal to the optical line terminal. According to the passive optical network system and the uplink optical signal and downlink optical signal transmission method, using efficiency of a port of the passive optical network (PON) is improved, and then operating cost is reduced.
Description
Technical field
The present invention relates to the communications field, in particular to a kind of passive optical network and uplink and downlink optical signal transmitting method.
Background technology
Under the overall background of global IT application, the broadband access technology development rapidly.Due to xPON (Passive Optical Network, EPON) the optical fiber access technology has the huge advantage that capacity is large, cost is low, various countries are all the important component part of FTTX (Fiber-To-The-X, optical fiber access) technology as national strategy.
At the actual deployment initial stage of FTTX network, user's rate of actual installation is generally very low, usually only have 20%, the residential quarter that perhaps relatively disperses for population, each PON mouth with number of users more limited, therefore, office side is in order to reduce the networking cost, below a plurality of ODN (Optical Distribution Network, Optical Distribution Network) multiplex network to PON mouth, in order to improve the multiplexing efficiency of PON mouth, see also Fig. 1.
therefore, how can accomplish fully to improve the multiplexing efficiency of PON mouth, support large splitting ratio, cut operating costs, it is something that present operator pays close attention to most, in prior art, it is to utilize mode coupler that the PON mouth is merged that a kind of method is arranged, but this method need to be to existing OLT (Optical Line Terminal, optical line terminal) transform, particularly the optical module in the method need to adopt TOSA (Transmitter Optical Subassembly, the light emission secondary module) and ROSA (Receiver Optical Subassembly, the light-receiving secondary module) duplex optical module, the concrete transformation support that also needs to relate to ODN, this shows, adopt this kind method to change larger to existing OLT, and cost is higher.If need not, OLT is done any change, still adopt simplex optical module that a plurality of PON mouths are merged, can fully improve the PON mouth multiplexing efficiency, reduce the operation cost of operator, still, do not provide a kind of effective solution in prior art at present.
Summary of the invention
The invention provides a kind of passive optical network and uplink and downlink optical signal transmitting method, to address the above problem at least.
According to an aspect of the present invention, provide a kind of passive optical network, having comprised: optical line terminal is used for sending downlink optical signal to optical network unit, and receives the uplink optical signal that optical network unit sends; Lightguide is connected to optical line terminal, is used for carrying out leaded light from the downlink optical signal of optical line terminal with from the uplink optical signal of optical network unit; Multi-mode coupler is connected to lightguide, is used for the downlink optical signal after the lightguide leaded light is distributed to Optical Distribution Network, and uplink optical signal is coupled to lightguide; Optical Distribution Network is connected to multi-mode coupler, be used for downstream signal is transferred to optical network unit, and with uplink signal transmissions to multi-mode coupler; Optical network unit is connected to Optical Distribution Network, is used for receiving the downlink optical signal of input, and sends uplink optical signal to optical line terminal.
Preferably, lightguide comprises: the first wave-division multiplexer filter, be connected to optical line terminal, and being used for will be from the downlink optical signal leaded light of optical line terminal to image intensifer; The second wave-division multiplexer filter is connected to the first wave-division multiplexer filter by image intensifer, and the downlink optical signal leaded light after being used for amplifying through image intensifer is to the Multiple modes coupling device; This system also comprises: image intensifer, be connected to respectively the first wave-division multiplexer filter and the second wave-division multiplexer filter, be used for the downlink optical signal after the first wave-division multiplexer filter leaded light is amplified, the downlink optical signal after amplifying is sent to the second wave-division multiplexer filter.
Preferably, the second wave-division multiplexer filter also is used for uplink optical signal leaded light to the first wave-division multiplexer filter after the multi-mode coupler leaded light, and, the first wave-division multiplexer filter, also being used for will be through the uplink optical signal leaded light after the second wave-division multiplexer filter leaded light to optical line terminal.
Preferably, lightguide comprises: the first optical circulator, be connected to optical line terminal, and being used for will be from the downlink optical signal leaded light of optical line terminal to image intensifer; The second optical circulator is connected to the first optical circulator by image intensifer, and the downlink optical signal leaded light after being used for amplifying through image intensifer is to the Multiple modes coupling device; This system also comprises: image intensifer, be connected to respectively the first optical circulator and the second optical circulator, and be used for the downlink optical signal after the first optical circulator leaded light is amplified, the downlink optical signal after amplifying is sent to the second optical circulator.
Preferably, the second optical circulator also is used for uplink optical signal leaded light to the first optical circulator after the multi-mode coupler leaded light, and, the first optical circulator, also being used for will be through the uplink optical signal leaded light after the second optical circulator leaded light to optical line terminal.
Preferably, optical line terminal comprises one of following: GPON optical line terminal, XGPON optical line terminal, EPON optical line terminal, or 10G-EPON optical line terminal.
Preferably, when optical line terminal was GPON optical line terminal or EPON optical line terminal, image intensifer was the S-band image intensifer, was used for the downlink optical signal from GPON or EPON optical line terminal is amplified; When optical line terminal was XGPON optical line terminal or 10G-EPON optical line terminal, image intensifer was the L-band image intensifer, was used for the downlink optical signal from XGPON optical line terminal or 10G-EPON optical line terminal is amplified.
Preferably, the S-band image intensifer is semiconductor amplifier SOA; Or the L-band image intensifer is SOA or fiber amplifier EDFA.
According to another aspect of the present invention, provide a kind of downlink optical signal sending method, comprising: optical line terminal sends downlink optical signal to lightguide; Lightguide receives downlink optical signal, with the downlink optical signal leaded light to the Multiple modes coupling device; Multi-mode coupler receives the downlink optical signal after the lightguide leaded light, and downlink optical signal is distributed to Optical Distribution Network; Optical Distribution Network is distributed to a plurality of optical network units with downstream signal; Optical network unit receives the downlink optical signal of input.
According to a further aspect of the invention, provide a kind of uplink optical signal sending method, comprising: optical network unit sends uplink optical signal to Optical Distribution Network; Optical Distribution Network is transferred to multi-mode coupler with uplink optical signal; Multi-mode coupler receives uplink optical signal, sends to lightguide after uplink optical signal is coupled; Lightguide carries out leaded light to the uplink optical signal that receives, and the uplink optical signal after leaded light is input to optical line terminal; Optical line terminal receives the uplink optical signal of input.
By the present invention, employing adds the mode of wave-division multiplexer filter, multi-mode coupler and image intensifer in existing many xPON EPON, solved prior art need to be to existing optical line terminal (OLT) for the utilance that improves the PON mouth thus significantly transform the problem that has increased cost, and then reached and only need to carry out minimum change to existing optical line terminal (OLT) and can improve the utilance of PON, the effect that cuts operating costs.
Description of drawings
Accompanying drawing described herein is used to provide a further understanding of the present invention, consists of the application's a part, and illustrative examples of the present invention and explanation thereof are used for explaining the present invention, do not consist of improper restriction of the present invention.In the accompanying drawings:
Fig. 1 is the schematic diagram according to the passive optical network structure of many xPON of correlation technique;
Fig. 2 is the structured flowchart according to the passive optical network of the embodiment of the present invention;
Fig. 3 is the structured flowchart according to the passive optical network of the preferred embodiment of the present invention one;
Fig. 4 is the knot schematic diagram according to the wave-division multiplexer filter of the preferred embodiment of the present invention one;
Fig. 5 is the structured flowchart according to the passive optical network of the preferred embodiment of the present invention two;
Fig. 6 is the structural representation according to the optical circulator of the preferred embodiment of the present invention two;
Fig. 7 is the knot schematic diagram according to the multi-mode coupler of using in the preferred embodiment of the present invention one and preferred embodiment two;
Fig. 8 is the sending method flow chart according to the downlink optical signal of the embodiment of the present invention;
Fig. 9 is the sending method flow chart according to the uplink optical signal of the embodiment of the present invention.
Embodiment
Hereinafter also describe in conjunction with the embodiments the present invention in detail with reference to accompanying drawing.Need to prove, in the situation that do not conflict, embodiment and the feature in embodiment in the application can make up mutually.
Fig. 2 is the structured flowchart according to the passive optical network of the embodiment of the present invention, and this system mainly comprises: optical line terminal 10, lightguide 20, multi-mode coupler, Optical Distribution Network 50 and optical network unit 40.Wherein, optical line terminal 10 is used for sending downlink optical signal to optical network unit 40, and receives the uplink optical signal that optical network unit 40 sends; Lightguide 20 is connected to optical line terminal 10, is used for carrying out leaded light from the downlink optical signal of optical line terminal 10 with from the uplink optical signal of multi-mode coupler 30; Multi-mode coupler 30 is connected to lightguide 20, is used for the downlink optical signal after lightguide 20 leaded lights is distributed to Optical Distribution Network 50, and uplink optical signal is coupled to lightguide 20; Optical Distribution Network 50 is connected to multi-mode coupler 30, be used for downstream signal is transferred to optical network unit 40, and with uplink signal transmissions to multi-mode coupler 30; Optical network unit 40 is connected to Optical Distribution Network 50, is used for receiving the downlink optical signal of input, and sends uplink optical signal to optical line terminal.
Please also refer to Fig. 3, in actual applications, lightguide 20 can comprise: the first wave-division multiplexer filter, be connected to optical line terminal 10, and being used for will be from the downlink optical signal leaded light of optical line terminal 10 to image intensifer; The second wave-division multiplexer filter is connected to the first wave-division multiplexer filter by image intensifer, and the downlink optical signal leaded light after being used for amplifying through image intensifer is to Multiple modes coupling device 30; This system can also comprise: image intensifer, be connected to respectively the first wave-division multiplexer filter and the second wave-division multiplexer filter, be used for the downlink optical signal after the first wave-division multiplexer filter leaded light is amplified, the downlink optical signal after amplifying is sent to the second wave-division multiplexer filter.
Preferably, the second wave-division multiplexer filter, can also be used for uplink optical signal leaded light to the first wave-division multiplexer filter after the multi-mode coupler leaded light, with, the first wave-division multiplexer filter, can also be used for will be through the uplink optical signal leaded light after the second wave-division multiplexer filter leaded light to optical line terminal 10.At this, Fig. 3 is not described in detail.
Please also refer to Fig. 5, in actual applications, lightguide 20 can also be comprised of following device, comprising: the first optical circulator, be connected to optical line terminal, and being used for will be from the downlink optical signal leaded light of optical line terminal 10 to image intensifer; The second optical circulator is connected to the first optical circulator by image intensifer, and the downlink optical signal leaded light after being used for amplifying through image intensifer is to Multiple modes coupling device 30; This system can also comprise: image intensifer, be connected to respectively the first optical circulator and the second optical circulator, and be used for the downlink optical signal after the first optical circulator leaded light is amplified, the downlink optical signal after amplifying is sent to the second optical circulator.
Preferably, the second optical circulator can also be used for uplink optical signal leaded light to the first optical circulator after multi-mode coupler 30 leaded lights, and, the first optical circulator, can also be used for will be through the uplink optical signal leaded light after the second optical circulator leaded light to optical line terminal 10.At this, Fig. 5 is not described in detail.
In actual applications, optical line terminal can comprise one of following: GPON optical line terminal, XGPON optical line terminal, EPON optical line terminal, or 10G-EPON optical line terminal.When optical line terminal 10 was GPON optical line terminal or EPON optical line terminal, image intensifer was the S-band image intensifer, was used for the downlink optical signal from GPON optical line terminal or EPON optical line terminal is amplified; When optical line terminal 10 was XGPON optical line terminal or 10G-EPON optical line terminal, image intensifer was the L-band image intensifer, was used for the downlink optical signal from XGPON optical line terminal or 10G-EPON optical line terminal is amplified.Wherein, the S-band image intensifer is semiconductor amplifier (SOA); The L-band image intensifer is SOA or fiber amplifier (EDFA).The position of image intensifer in lightguide can be with reference to figure 3 or Fig. 5.
Be described in detail below by enforcement one, two pairs of above-mentioned passive optical networks of embodiment.
Embodiment one
Fig. 3 is the structured flowchart according to the passive optical network of the preferred embodiment of the present invention one, and the below, preferably implements one to this and is described in detail simultaneously in conjunction with Fig. 2 take Fig. 3 as main.
For existing a plurality of ODN networks are incorporated in an OLT, increase the functional requirement that a series of new functional modules reach leaded light and amplification in this optimum decision system, Fig. 3 show these new functional modules and the relation between them and with ODN networking annexation, at first the below is described the function of these modules, then the workflow between them is set forth.
Four different functional modules that newly increase are respectively: the first wave-division multiplexer filter (WDM1) 32, the second wave-division multiplexer filter (WDM2) 34, multi-mode coupler 30 and image intensifer 36.Wherein,
Wave-division multiplexer filter (comprising WDM132 and WDM234): major function is to the carrying out shunt of up-downgoing light and synthetic, comprises two: WDM132 and WDM234.Wherein, WDM132 is connected with the optical module of OLT by multimode fiber, its major function from the up photoconduction of up optical channel on OLT, and from the descending photoconduction of OLT on the image intensifer of descending optical channel; WDM234 is connected with multi-mode coupler by multimode fiber, its major function from the up photoconduction of multi-mode coupler to up optical channel, and from the descending photoconduction of descending optical channel to multi-mode coupler.
In actual applications, can adopt existing film filtering TFF technology, can complete this function with a linear filter sheet, please refer to Fig. 4, as shown in Figure 4, wave-division multiplexer filter can be a sideband filter take 1450nm as separation, for wavelength less than the transmission mouth turnover from it of the light of 1450nm, and the light of wavelength greater than 1450nm is passed in and out from its reflex port, its C interface directly connects multi-mode coupler or OLT.
Multi-mode coupler 30: major function is that up being optically coupled in from a plurality of ODN networks is input on the 2nd WDM filter together, and the descending light from the 2nd WDM filter is evenly distributed on the trunk optical fiber of a plurality of ODN.Please refer to Fig. 7, as shown in Figure 7, up light is transferred on a WDM filter by multimode fiber after monomode fiber is aggregated, and descending light is evenly distributed on a plurality of monomode fibers by multimode fiber; This flowcollector aggregation scheme FlowCollector can be lens, also can merge the various ways such as vertebral pulling or slab guide coupling, then coupling light on multimode fiber a plurality of monomode fibers.
Image intensifer 36: major function is that the descending light to OLT amplifies, due to the descending light of GPON at 1480nm between 1500nm, therefore, its service band is positioned at S-band, usually selects the SOA of S-band as its image intensifer; And the descending light of XG-PON at 1575nm between 1581nm, therefore, its service band is positioned at L-band, usually selects the EDFA of L-band or SOA as its image intensifer.
For the connection between modules, also please refer to Fig. 3, the consolidation problem of four ODN networks once here mainly is described, at first, the trunk optical fiber of four ODN is connected with multi-mode coupler, then is connected with the WDM2 filter by multimode fiber, and its transmission interface is connected with the transmission interface of WDM1 filter by multimode fiber, and the WDM1 filter directly is connected with the simplex optical module of OLT by multimode fiber, and the reflective interface of latter two WDM links together by image intensifer.
Operation principle and the workflow of this optimum decision system are as follows:
at first, an OLT is arranged in office side, (for many GPON network, this OLT is GPON-OLT, and to many XGPON network, this OLT is the OLT of XG-PON), its descending light enters the descending optical channel that monomode fiber forms after arriving the WDM1 filter by multimode fiber, an image intensifer is arranged on this optical channel, (as: for the descending light of GPON, can use the image intensifer of S-band, and for the descending light of XGPON, can use the image intensifer of L-band), light after amplifying arrives the WDM2 filter by monomode fiber, then enter multi-mode coupler by multimode fiber, enter the trunk optical fiber of connected all ODN after this coupler light splitting, pass through trunk optical fiber, optical splitter and branch optical fiber arrive on each ONU.
ONU uploads up light, pass on coupled multi-mode coupler through corresponding ODN network, enter the WDM1 filter by multimode fiber, then be directed to up optical channel, the multimode fiber that closes Waveguide module and partial wave light guide module by connection again transfers to the partial wave light guide module, by on the multimode fiber that the WDM1 filter leads with the optical module of OLT is connected, then enter OLT at last.
Embodiment two
Fig. 5 is the structured flowchart according to the passive optical network of the preferred embodiment of the present invention two, and the below is take Fig. 5 as main, and simultaneously in conjunction with Fig. 2, this is preferably implemented two and is described in detail:
For existing a plurality of ODN networks are incorporated in an OLT, increase the functional requirement that a series of new functional modules reach leaded light and amplification in this optimum decision system, Fig. 5 show these new functional modules and the relation between them and with ODN networking annexation, at first the below is described the function of these modules, then the workflow between them is set forth.
Four different functional modules that newly increase are respectively: the first optical circulator 52, the second optical circulator 54, multi-mode coupler 30 and image intensifer 56.Wherein,
Optical circulator (52,54): major function is to the carrying out shunt of up-downgoing light and synthetic.Please also refer to Fig. 6, Fig. 6 is the structural representation according to the optical circulator of the preferred embodiment of the present invention two.As shown in Figure 5, optical circulator comprises two, and one is the first optical circulator, and its interface 2 is connected with multi-mode coupler by multimode fiber, be mainly used to from the up photoconduction of multi-mode coupler to up optical channel, and from the descending photoconduction of descending optical channel to multi-mode coupler; Another is the second optical circulator, and its interface 2 is connected with the optical module of OLT by multimode fiber, be mainly used to from the up photoconduction of up optical channel on OLT, and from the descending photoconduction of OLT on the image intensifer of descending optical channel.
Multi-mode coupler 30: major function is that up being optically coupled in from a plurality of ODN networks is input on the second optical circulator together, and the descending light from the second optical circulator is evenly distributed on the trunk optical fiber of a plurality of ODN.Please refer to Fig. 7, as shown in Figure 7, up light is transferred on the second optical circulator by multimode fiber after monomode fiber is aggregated, and descending light is evenly distributed on a plurality of monomode fibers by multimode fiber; This flowcollector aggregation scheme FlowCollector can be lens, also can merge mode the coupling light on multimode fiber a plurality of monomode fibers such as vertebral pulling or slab guide coupling.
Image intensifer 56: major function is that the descending light to OLT amplifies, due to the descending light of GPON at 1480nm between 1500nm, so its service band needs in S-band, usually select the SOA of S-band as its image intensifer.And the descending light of XG-PON at 1575nm between 1581nm, so its service band needs at L-band, usually selects the EDFA of L-band or SOA as its image intensifer.
For the connection between modules, also please refer to Fig. 5, the consolidation problem of four ODN networks of influences here, at first the trunk optical fiber of four ODN is connected with multi-mode coupler, then be connected with the interface 2 of the second optical circulator by multimode fiber, its outlet 3 is connected with the import 1 of the first optical circulator by multimode fiber, and the interface 2 of the first optical circulator directly is connected with the simplex optical module of OLT by multimode fiber.With monomode fiber, the outlet 3 of the first optical circulator is connected with image intensifer at last, and the outlet of image intensifer is connected with the import 1 of the second optical circulator.
Operation principle and the workflow of this optimum decision system are as follows:
At first, the descending light of OLT arrives on the interface 2 of the first optical circulator by multimode fiber, through exporting on 3 image intensifers that out enter on descending optical channel from it after leaded light, import 1 from the second optical circulator after amplifying enters, arrive on multi-mode coupler by multimode fiber after going out its general-purpose interface 2, then divide on its four monomode fibers uniformly, enter corresponding ODN network by connected trunk optical fiber, through optical splitter, branch optical fiber arrives on each ONU at last.
The up light that ONU uploads arrives on corresponding ODN optical splitter by branch optical fiber separately, trunk optical fiber through being attached thereto arrives the single-mode interface of multi-mode coupler, then going out the multimode interface arrives on the interface 2 of the second optical circulator through multimode fiber, go out its outlet 3 through leaded light and arrive by multimode fiber in the import 1 of the first optical circulator, go out its general-purpose interface 2 through leaded light and arrive on the simplex optical module of OLT by multimode fiber.
Need to prove, above-described embodiment one and embodiment two only are incorporated on an OLT in office side the PON network with four ODN, but the present invention is not limited to only have the merging of four ODN, in actual applications, can be N ODN, the multi-mode coupler that only needs to change corresponding 1:N gets final product.
The passive optical network that adopts above-described embodiment to provide, can solve of the prior art for the utilance that improves the PON mouth only to existing optical line terminal (OLT) thus significantly transform the problem that has increased cost, and then reached and only need to carry out minimum change to existing optical line terminal (OLT) and can improve the utilance of PON, the effect that cuts operating costs.
Fig. 8 is the downlink optical signal sending method flow chart according to the embodiment of the present invention, and the method can utilize above-mentioned passive optical network to realize.As shown in Figure 8, the method mainly comprises the following steps (step S802-step S810):
Step S802, optical line terminal sends downlink optical signal to lightguide;
Step S804, lightguide receive downlink optical signal, with the downlink optical signal leaded light to the Multiple modes coupling device;
Step S806, multi-mode coupler receives the downlink optical signal after the lightguide leaded light, and downlink optical signal is distributed to Optical Distribution Network;
Step S808, Optical Distribution Network is distributed to a plurality of optical network units with downlink optical signal;
Step S810, optical network unit receives the downlink optical signal of input.
Fig. 9 is the uplink optical signal sending method flow chart according to the embodiment of the present invention, and as shown in Figure 9, the method mainly comprises the following steps (step S902-step S910):
Step S902, optical network unit sends uplink optical signal to Optical Distribution Network;
Step S904, Optical Distribution Network is transferred to multi-mode coupler with uplink optical signal;
Step S906, multi-mode coupler receives uplink optical signal, sends to lightguide after uplink optical signal is coupled;
Step S908, lightguide carries out leaded light to the uplink optical signal that receives, and the uplink optical signal after leaded light is input to optical line terminal;
Step S910, optical line terminal receives the uplink optical signal of input.
The uplink and downlink optical signal transmitting method that adopts above-described embodiment to provide, can solve of the prior art for the utilance that improves the PON mouth only to existing optical line terminal (OLT) thus significantly transform the problem that has increased cost, and then reached and only need to carry out minimum change to existing optical line terminal (OLT) and can improve the utilance of PON, the effect that cuts operating costs.
from above description, can find out, the present invention has realized following technique effect: by add wave-division multiplexer filter (or optical circulator) in the EPON of existing many xPON, the mode of multi-mode coupler and image intensifer, solved prior art need to be to existing optical line terminal (OLT) for the utilance that improves the PON mouth thus significantly transform the problem that has increased cost, and then only reached and to have carried out to existing optical line terminal (OLT) utilance that minimum change can improve PON, the effect that cuts operating costs.
The above is only the preferred embodiments of the present invention, is not limited to the present invention, and for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (10)
1. a passive optical network, is characterized in that, comprising:
Optical line terminal is used for sending downlink optical signal to optical network unit, and receives the uplink optical signal that described optical network unit sends;
Lightguide is connected to described optical line terminal, is used for carrying out leaded light from the described downlink optical signal of described optical line terminal with from the described uplink optical signal of described optical network unit;
Multi-mode coupler is connected to described lightguide, is used for the described downlink optical signal after described lightguide leaded light is distributed to Optical Distribution Network, and described uplink optical signal is coupled to described lightguide;
Described Optical Distribution Network is connected to described multi-mode coupler, is used for described downstream signal is transferred to described optical network unit, and gives described multi-mode coupler with described uplink signal transmissions;
Described optical network unit is connected to described Optical Distribution Network, is used for receiving the described downlink optical signal of input, and sends described uplink optical signal to described optical line terminal.
2. system according to claim 1, is characterized in that,
Described lightguide comprises:
The first wave-division multiplexer filter is connected to described optical line terminal, and being used for will be from the described downlink optical signal leaded light of described optical line terminal to image intensifer;
The second wave-division multiplexer filter is connected to described the first wave-division multiplexer filter by described image intensifer, and the described downlink optical signal leaded light after being used for amplifying through described image intensifer is to described multi-mode coupler;
Described system also comprises:
Described image intensifer, be connected to respectively described the first wave-division multiplexer filter and described the second wave-division multiplexer filter, be used for the described downlink optical signal after described the first wave-division multiplexer filter leaded light is amplified, the described downlink optical signal after amplifying is sent to described the second wave-division multiplexer filter.
3. system according to claim 2, is characterized in that,
Described the second wave-division multiplexer filter also is used for the described uplink optical signal leaded light after described multi-mode coupler leaded light to described the first wave-division multiplexer filter, and,
Described the first wave-division multiplexer filter, also being used for will be through the described uplink optical signal leaded light after described the second wave-division multiplexer filter leaded light to described optical line terminal.
4. system according to claim 1, is characterized in that,
Described lightguide comprises:
The first optical circulator is connected to described optical line terminal, and being used for will be from the described downlink optical signal leaded light of described optical line terminal to described image intensifer;
The second optical circulator is connected to described the first optical circulator by described image intensifer, and the described downlink optical signal leaded light after being used for amplifying through described image intensifer is to described multi-mode coupler;
Described system also comprises:
Described image intensifer, be connected to respectively described the first optical circulator and described the second optical circulator, be used for the described downlink optical signal after described the first optical circulator leaded light is amplified, the described downlink optical signal after amplifying is sent to described the second optical circulator.
5. system according to claim 4, is characterized in that,
Described the second optical circulator also is used for the described uplink optical signal leaded light after described multi-mode coupler leaded light to described the first optical circulator, and,
Described the first optical circulator, also being used for will be through the described uplink optical signal leaded light after described the second optical circulator leaded light to described optical line terminal.
6. any one described system according to claim 1 to 5, is characterized in that, it is one of following that described optical line terminal comprises:
The GPON optical line terminal, XGPON optical line terminal, EPON optical line terminal, or 10G-EPON optical line terminal.
7. system according to claim 6, is characterized in that,
When described optical line terminal is described GPON optical line terminal or described EPON optical line terminal,
Described image intensifer is the S-band image intensifer, is used for the described downlink optical signal from described GPON optical line terminal or described EPON optical line terminal is amplified;
When described optical line terminal is described XGPON optical line terminal or described 10G-EPON optical line terminal,
Described image intensifer is the L-band image intensifer, is used for the described downlink optical signal from described XGPON optical line terminal or described 10G-EPON optical line terminal is amplified.
8. system according to claim 7, is characterized in that,
Described S-band image intensifer is semiconductor amplifier SOA; Or,
Described L-band image intensifer is described SOA or fiber amplifier EDFA.
9. a downlink optical signal sending method, is characterized in that, comprising:
Optical line terminal sends downlink optical signal to lightguide;
Described lightguide receives described downlink optical signal, with described downlink optical signal leaded light to the Multiple modes coupling device;
Described multi-mode coupler receives the described downlink optical signal after described lightguide leaded light, and described downlink optical signal is distributed to Optical Distribution Network;
Described Optical Distribution Network is distributed to a plurality of optical network units with described downstream signal;
Described optical network unit receives the described downlink optical signal of input.
10. a uplink optical signal sending method, is characterized in that, comprising:
Optical network unit sends uplink optical signal to Optical Distribution Network;
Described Optical Distribution Network is transferred to multi-mode coupler with described uplink optical signal;
Described multi-mode coupler receives described uplink optical signal, sends to lightguide after described uplink optical signal is coupled;
Described lightguide carries out leaded light to the described uplink optical signal that receives, and the described uplink optical signal after leaded light is input to optical line terminal;
Described optical line terminal receives the described uplink optical signal of input.
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