CN101087174A - Passive optical network system and method of optical routing device and application optical routing device - Google Patents
Passive optical network system and method of optical routing device and application optical routing device Download PDFInfo
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- CN101087174A CN101087174A CNA2006100874862A CN200610087486A CN101087174A CN 101087174 A CN101087174 A CN 101087174A CN A2006100874862 A CNA2006100874862 A CN A2006100874862A CN 200610087486 A CN200610087486 A CN 200610087486A CN 101087174 A CN101087174 A CN 101087174A
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Abstract
The invention discloses an optical route device, which can output the input optical signal with different wavelength at arbitrary output end, and it includes: uniting/splitting wave device, which is used to unite and split the received optical signal; several splitters, and one port connects with several second uniting/splitting wave devices, which is used to distributing/combining the received optical signal; and routing device, connects with ports of several splitters, which is used to switch between the different output ports, and the optical signal can be sent to any output ports. The invention also discloses wireless optical network system and method which use the optical route device. Using the invention, it can realize the general purpose of optical network unit, and it is convenient for providing service for vendor.
Description
Technical field
The present invention relates to a kind of passive optical network, more specifically, the present invention relates to a kind of passive optical network, it can at random be routed to wavelength optical signals any non-colored light network element.
Background technology
At present, the professional through-rate of many Internet inserts from modes such as the dialing modem of 56K to several million, asymmetric digital line subscribers feeder (ADSL), cable modem (CM), VDSL respectively.But, for miscellaneous service is provided, as high-quality video information business, VoD (Video on Demand) business etc., the transmission of data approximately requires to have the bandwidth of 100Mbps, can't meet the demands with above-mentioned several access waies, therefore, increase rapidly with the demand of optical fibre installation Access Network, EPON (PON) can satisfy these new business demands and economy, operation maintenance user access networks easily again just, as shown in Figure 1.Fig. 1 shows the passive optical network of prior art.Generally speaking, a passive optical network comprises a central office 102, optical distribution network 104 and a plurality of optical network unit 106 (ONU, Optical Network Unit), the difference that realizes according to PON, PON can be divided into different types, be respectively the ATM-PON that adopts ATM, based on the EPON (Ethernet Over PON) of Ethernet, GPON with gigabit speed, adopt the WDM-PON of wavelength division multiplexing, and the OCMDA-PON that adopts optical cdma.
Wavelength-division multiplex system (WDM-PON) is owing to the advantages such as Information Security of its huge bandwidth capacity, similarity point to-point communication cause global communication expert's extensive concern, but WDM-PON network equipment complexity, cost are very high, therefore really commercialization always.Recent years, because the development of optical communication technique, the decline of relative photo communication device price, WDM-PON becomes the focus of global communications industry once again, many equipment vendors and communications experts are reducing WDM-PON network equipment complexity, are doing a large amount of, deep research aspect reducing cost, wherein, especially with Korea S and the U.S. for.These have researched and solved a large amount of technological difficulties, and aspect reducing cost, also obtained very big effect, as outdoor array waveguide grating (AWG, Array Waveguide Grating) the injection locking light source technology among the multi-wavelength light source technology in temperature control compensation technique, non-heat array wave guide grating technology, the optical line terminal (OLT, Optical Line Terminal), the light among ONU reflection amplifying technique, the ONU etc. has all been obtained huge progress.
Meanwhile, for a long time, because it is big to lay infrastructure of telecommunication cost of investment, the interests entity that relates to is many, the restriction of policy, laws and regulations is many, the telecom operators that got involved have reasons such as exclusiveness, and the infrastructure of telecommunication of Access Network is all monopolized by conventional telecommunications operator basically at present.But, the non-binding of local loop inserts (Unbundled Accessto the Local Loop), competition for the in-depth telecommunication market is significant, for the competition degree that promotes local fixed-line phone service, the Internet broadband access service and other telecommunication services, for the repeated construction of avoiding the infrastructure of telecommunication, enjoy the telecommunication service of high performance-price ratio for the consumer, can bring into play material impact, also can promote the development in a national telecommunication market.Therefore countries and regions such as the U.S., Britain and some other European Union member countries, Australia, Singapore, Japan, Hong Kong have been formulated the non-binding of local loop in succession and have been inserted system.Yet the performance from the non-binding access of external local loop system only relies on the measure of control of telecommunication law, and can't really introduce competition fully in the Access Network field.
As the most promising Access Network of future generation, the natural characteristic that the WDM-PON network is had can assist the non-binding of local loop to insert the enforcement of system well, really realizes the competition situation in Access Network field.The present invention utilizes the natural characteristic of WDM-PON network just, designed the WDM-PON network system that to support a plurality of telecom operators or provider's (being referred to as operator among the present invention), utilize this network system, user terminal can freely be selected operator, and, the telecommunications supervision department of government can judge clearly whether the Incumbent of laying this WDM-PON infrastructure has been observed the non-binding of local loop and inserted system, thereby can introduce competition fully well in the Access Network field.
At present, mentioned a kind of technical scheme among the U.S. Pat 20050175344a1, this scheme utilizes wavelength-division multiplex technique at same optical distribution network (ODN, the service of a plurality of operators is provided for the user Optical DistrubtionNetwork), and the user can freely select the service of one of them operator.
In the technical scheme that patent US20050175344a1 mentions, ONU is not that colourless (colorless) promptly is not Wavelength-independent, the wavelength of the ONU up-downgoing of each operator is fixed (it is up that wavelength is used for, and a wavelength is used for descending), and this can cause following problem:
Wavelength planning is chaotic, because operator is in different sub-districts, it is right to rent different wavelength;
Because the up-downgoing wavelength of the ONU of different operators is to being skimble-scamble, so the user needs to change ONU when selecting different operators, brought very big trouble to the user, virtually the degree of freedom selected of limited subscriber;
Because operator is in different sub-districts, it is right to rent different wavelength, and operator must the polytype ONU of stock, has therefore increased stock's burden of operator, has limited the service dispense of operator;
Because terminal producer need produce polytype ONU, limited the total amount that all kinds ONU produces in batches, be unfavorable for the reduction of ONU cost.
Summary of the invention
The present invention is intended to solve above-mentioned defective of the prior art, the passive optical network and the method for a kind of optical routing equipment and application optical routing equipment is provided, thereby has realized that optical network unit is colourless, and promptly the optical network unit of each operator can be general.
According to an aspect of the present invention, the invention provides a kind of optical routing equipment, it can at random output to any output port with a plurality of wavelength optical signals of input, and this equipment comprises: close/wave splitter device, the optical multiplexed signal that is used for receiving is used and demultiplexing; A plurality of splitters, the port of a side respectively with close/wave splitter device is connected, and is used for the light signal that distributing receives; And route device, link to each other with the port of the opposite side of a plurality of splitters, be used between different output ports, switching, light signal is outputed to any output port.
Wherein, according to of the present invention closing/wave splitter device by first close/wave splitter device and a plurality of second closes/wave splitter device constitutes.First close/wave splitter device is an array waveguide grating; Splitter is the 1:N splitter, can be an independent 1:N splitter, also can be the 1:N splitter that the above splitter series connection of two-stage or two-stage constitutes; Route device is the optical fiber cross matrix, and route device can be that manual switchover, automatic switchover or Remote switch.
According to a further aspect in the invention, the invention provides a kind of passive optical network, this system comprises: a plurality of optical line terminals, use different wavelength; Optical Distribution Network links to each other with a plurality of optical line terminals, is used for the wavelength optical signals from a plurality of optical line terminals at random is transferred to a plurality of non-colored light network element; And a plurality of non-colored light network element, be connected with Optical Distribution Network, be used for by Optical Distribution Network, selectively be connected, to carry out the bidirectional data transfers with optical line terminal with in a plurality of optical line terminals any one.Wherein, Optical Distribution Network further comprises: optical routing equipment, be used at random to output to from a plurality of wavelength optical signals of a plurality of optical line terminals input any one of a plurality of non-colored light network element, and will be transferred to corresponding optical line terminal in the opposite direction from the light signal of non-colored light network element; First optical fiber is used for a plurality of optical line terminals are connected with optical routing equipment, and the transmitted in both directions of carrying out light signal between described a plurality of optical line terminals and described optical routing equipment; And a plurality of second optical fiber, be used for optical routing equipment is connected with a plurality of non-colored light network element, and the transmitted in both directions of between optical routing equipment and a plurality of non-colored light network element, carrying out light signal.
Wherein, described optical routing equipment comprises: close/wave splitter device, the optical multiplexed signal that is used for receiving is used and demultiplexing; A plurality of splitters, the port of a side respectively with close/wave splitter device is connected, and is used for the light signal that distributing receives; And route device, link to each other with the port of the opposite side of a plurality of splitters, be used between different output ports, switching, light signal is outputed to any one in a plurality of non-colored light network element.Wherein, close/wave splitter device by first close/partial wave and a plurality of closing/wave splitter device constitute.First close/wave splitter device is an array waveguide grating.Splitter is the 1:N splitter.Route device is the optical fiber cross matrix.
In addition, optical line terminal further comprises: Switching Module is used for carrying out exchanges data with the upper level network; The downlink module, be connected to Switching Module, be used to export two descending light with different wave length, one of them descending light is used to carry the downlink data from Switching Module, another descending unmodulated light of only not carrying data, as the light source of non-colored light network element, and with mixed signal of two descending light compositings; And up receiver module, be used to receive light signal, and light signal is converted to the signal of telecommunication, and the signal of telecommunication is carried out demodulation to obtain sending to the data of Switching Module from Optical Distribution Network.
Wherein, the downlink module further comprises: two light sources are used to export two descending light with different wave length; Modulator is used to use from the data of Switching Module the descending light that is used to carry data is modulated; And coupler, be connected to modulator, be used for two descending light are coupled.Wherein the downlink module can also comprise amplifier, is used for amplifying at least one of two descending light.
Wherein, up receiver module further comprises: optical-electrical converter is used for the light signal from the user is converted to the signal of telecommunication; And demodulator, be connected to optical-electrical converter, be used for the signal of telecommunication is carried out demodulation to obtain sending to the data of Switching Module.
Wherein, the non-colored light network element further comprises: channel-splitting filter, be connected with Optical Distribution Network, and be used for and will become to have two light signals of different wave length from a separate optical signals of Optical Distribution Network, one of them light signal carries user data, and another light signal does not have carrying user data; The receiving demodulation device is connected with channel-splitting filter, is used for demodulating downlink data from the light signal that carries user data from channel-splitting filter; Switching Module is used for carrying out exchanges data with the user; And modulator, be connected with Switching Module, be used to use upstream data that the light signal that does not have carrying user data is modulated, and the light signal after will modulating send to Optical Distribution Network by channel-splitting filter from Switching Module.
According to a further aspect in the invention, the invention provides a kind of method that a plurality of optical line terminals are provided in same EPON, may further comprise the steps: step a will synthesize a mixed signal from the wavelength optical signals of a plurality of optical line terminals; Step b sends to Optical Distribution Network with mixed signal; Step c, Optical Distribution Network are transferred to wavelength optical signals different optical network units as required, and will be transferred to corresponding optical line terminal in the opposite direction from the light signal of different optical network units; And steps d, optical network unit receive and demodulation from the carrying of its corresponding optical line terminal the light signal of downlink data, recover user data, and user's upstream data is modulated in the downlink optical signal that does not carry data from corresponding optical line terminal, and by Optical Distribution Network transmission light echo line terminal.Wherein, step c is further comprising the steps of: wavelength optical signals is carried out multiplexing and demultiplexing; The light signal that distributing receives; And between different a plurality of optical network units, switch, light signal is outputed to any one in a plurality of optical network units.
In addition, the method according to this invention, a plurality of optical line terminals adopt similar and different media access control protocol.If a plurality of optical line terminals adopt different media access control protocols, then a plurality of optical network units are connected respectively to compatible with it optical line terminal; If a plurality of optical line terminals adopt identical media access control protocol, then a plurality of optical network units are connected respectively to any one in selected a plurality of optical line terminal.
In addition, optical line terminal is arranged in identical EPON, adopts the method for wavelength division multiplexing to use different up-downgoing wavelength right.
In addition, the method according to this invention, can with a plurality of optical network units by optical routing equipment respectively route be connected to separately the optical line terminal of selecting.
By above-mentioned optical routing equipment and optical network system and method, the present invention has realized optical network unit general of each operator, has made things convenient for the service dispense of each operator.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 shows the PON network configuration according to correlation technique;
Fig. 2 shows the functional schematic of optical line terminal according to an embodiment of the invention;
Fig. 3 shows the functional schematic of non-colored light network element according to an embodiment of the invention;
Fig. 4 shows the functional schematic of optical routing equipment according to an embodiment of the invention;
Fig. 5 shows the schematic diagram of the position of optical routing equipment in EPON shown in Figure 4;
Fig. 6 shows the schematic diagram of the WDM-PON system of a plurality of telecom operators of support according to an embodiment of the invention;
Fig. 7 shows the schematic diagram of the WDM-PON system of a plurality of agreements of support according to another embodiment of the present invention; And
Fig. 8 shows the flow chart that the method for a plurality of optical line terminals is provided according to an embodiment of the invention in same EPON.
Embodiment
Describe embodiments of the invention in detail below in conjunction with accompanying drawing.
Fig. 2 shows the functional schematic of optical line terminal according to an embodiment of the invention.As shown in Figure 2, Local Exchange 200 comprises the optical line terminal (below be called OLT) of a plurality of operators.Because each OLT has identical structure, thus following be that example describes only with the OLTn of the n of operator.OLTn 210 comprises: Switching Module 202 is used for carrying out exchanges data with the upper level network; Downlink module 204, be connected to Switching Module 202, be used to export two descending light with different wave length, one of them descending smooth λ n1 is used to carry the downlink data from Switching Module 202, another descending smooth λ n2 is the unmodulated light of not carrying data, because during this unmodulated light process optical routing equipment bigger loss is arranged, thus it is amplified with the light source as the non-colored light network element, and two descending light are synthesized mixed signals by coupler 2046; And up reception and demodulation module 206, be used to receive light signal, and light signal is converted to the signal of telecommunication, and the signal of telecommunication is carried out demodulation to obtain sending to the data of Switching Module from Optical Distribution Network.
Fig. 3 shows the functional schematic of non-colored light network element according to an embodiment of the invention.As shown in Figure 3, optical network unit (below be called ONU) receives the descending light that is respectively λ n1 and λ n2 from the wavelength of OLTn, this descending light through one close/channel-splitting filter 302 after, the wavelength that has carried user's downlink data be the optical routing of λ n1 to receiving demodulation module 304, be routed to modulator 306 and wavelength is the unmodulated light of λ n2.Optical-electrical converter 308 in the receiving demodulation module 304 and demodulator 310 are finished opto-electronic conversion and the data demodulates of λ n1, through Switching Module 312 downlink data are sent to the user.Modulator 306 then will be modulated to through the user uplink data of Switching Module 312 in the light that wavelength is λ n2, and via closing/channel-splitting filter 302, be transmitted into Optical Distribution Network, and be sent to up reception and the demodulation module 206 of the OLTn of the n of operator.Wherein, the modulator 306 of ONU can be selected RSOA (reflection type semiconductor image intensifer) or injection locking F-P LD or external modulator (external modulator) for use.
Fig. 4 shows the functional schematic of optical routing equipment according to an embodiment of the invention.As shown in Figure 4, optical routing equipment according to an embodiment of the invention comprises: first closes/wave splitter device 402, is used for wavelength optical signals is carried out multiplexing and demultiplexing; A plurality of second closes/wave splitter device 404, is connected to first and closes/wave splitter device, is used for the optical multiplexed signal from same operator that receives is used and demultiplexing; The port of a plurality of splitter 406, one sides closes with a plurality of second respectively/and wave splitter device is connected, and is used for the light signal that distributing receives; And as the optical fiber cross matrix 408 of route device, link to each other with the port of the opposite side of a plurality of splitters, be used between different output ports, switching, light signal is outputed to any one in a plurality of non-colored light network element.
First close in this embodiment ,/wave splitter device 402 is for array wave length grating (below be called AWG), is that the light that is respectively λ 11, λ 12...... λ n1, λ n2 carries out multiplexing and demultiplexing to wavelength.A plurality of second close/wave splitter device is n and closes/multiplexer/demultiplexer 404 that at down direction, the mixed signal of two descending light compositings from operator, the splitter 406 of a shared then 1:32 is distributed to each user; And at up direction, be the upward signal from the splitter 406 of 1:32 that wavelength is respectively λ x2 (wherein then, the integer of 1≤x≤n) the separate optical signals of having carried user uplink data is come out, and is routed to the corresponding port of AWG402, to be transferred to OLT by AWG 402.The splitter 406 of n 1:32 corresponding one by one with each operator (also can adopt the branch that constitutes 1:32 more than the series connection of the splitter of one-level, be the splitter of 1:4 as the first order, and the second level is the splitter of 1:8) wherein.Wherein, optical fiber cross matrix 408 is a route device, mainly the operator of selecting according to the user carries out the wire jumper processing, the port on optical fiber cross matrix 408 the right links to each other with Drop cable, and 32 ports of corresponding with each operator respectively 1:32 splitter 406 of the port on optical fiber cross matrix 408 left sides link to each other, when the user selects different operators, as long as in optical fiber cross matrix 408, carry out once wire jumper processing simply and easily, wire jumper both can be manual, also can be mechanical, even can make Remote.
Fig. 5 shows the schematic diagram of the position of optical routing equipment in EPON shown in Figure 4.As shown in Figure 5, far-end node wavelength routing device shown in Figure 5 502 is connected to Local Exchange 508 by feeder line optical fiber 504, and is connected to user terminal ONU 510 by Drop cable 506.
Fig. 6 shows the schematic diagram of the WDM-PON system of a plurality of telecom operators of support according to an embodiment of the invention.As shown in Figure 6, operator 1, the n of 2... operator of operator select a certain media access control protocol as adopting GPON as media access control protocol, operator 1 has different wavelength to the n of operator, wherein, the up-downgoing wavelength of operator 1 is to being λ 11 and λ 12, the up-downgoing wavelength of operator 2 is to being λ 21 and λ 22 ..., the up-downgoing wavelength of the n of operator is to being λ n1 and λ n2.
Fig. 8 shows the flow chart that the method for a plurality of optical line terminals is provided according to an embodiment of the invention in same EPON.Be described in detail in the process that a plurality of optical line terminals are provided in the same EPON below in conjunction with Fig. 6 and Fig. 8.
For downstream signal, as shown in Figure 8,, will synthesize a mixed signal from the light signal of the different wavelength of n optical line terminal of the different operators in the Local Exchange 600 1 to n at step S802.At step S804 this mixed signal is offered wavelength routing module 602 then.At step S806, optical routing module 602 is carried out demultiplexing (S8062) by AWG with mixed signal, and will merge (S8064) through the signal of demultiplexing by wave multiplexer, offer the user (S8066) of corresponding each operator then by splitter and optical fiber cross matrix.The optical network unit of user side receive and demodulation from the carrying of respective operator the light signal of downlink data, recover user data.
For upward signal, as shown in Figure 6, the optical network unit of user side is modulated to user's upstream data in the downlink optical signal that does not carry data from respective operator, and will merge into mixed signal from each user's light signal, and be transferred to Local Exchange 600 by wavelength routing module 602.In Local Exchange 600, mixed signal is converted to the light with different wave length through channel-splitting filter, and being transferred to the up reception and the demodulation module of each operator respectively, light becomes the data that can send to Switching Module through opto-electronic conversion and demodulation in this module.
Fig. 7 shows the schematic diagram of the WDM-PON system of a plurality of agreements of support according to another embodiment of the present invention.As shown in Figure 7, operator 1 adopts the media access control protocol of GPON, its up-downgoing wavelength is to being λ 11 and λ 12, and the n of operator employing is the media access control protocol of BPON, its up-downgoing wavelength is to being λ n1 and λ n2, is the media access control protocol of EPON and operator 2 adopts, and its up-downgoing wavelength is to being λ 21 and λ 22, ..., by that analogy.System shown in Figure 7 is that with the difference of system shown in Figure 6 the optical line terminal of the operator in the system shown in Figure 7 adopts different agreements.Because the optical link unit adopts different agreements, so the agreement that the wavelength routing module is supported according to optical network unit is transferred to different optical network units with wavelength optical signals, and will be transferred to corresponding optical line terminal in the opposite direction from the light signal of different optical network units.Other operation is identical with system shown in Figure 6, no longer repeats.
By according to embodiments of the invention, can realize optical network unit general of an operator, made things convenient for the service dispense of each operator.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (27)
1. an optical routing equipment is characterized in that, a plurality of wavelength optical signals of input at random can be outputed to any output port, and described equipment comprises:
Close/wave splitter device, the optical multiplexed signal that is used for receiving is used and demultiplexing;
A plurality of splitters, the port of described a plurality of splitter one sides is connected with described closing/wave splitter device respectively, is used for the light signal that distributing receives; And
Route device links to each other with the port of the opposite side of described a plurality of splitters, is used for switching between different described output ports, described light signal is outputed to any described output port.
2. optical routing equipment according to claim 1 is characterized in that, described closing/wave splitter device by first close/wave splitter device and a plurality of second closes/wave splitter device constitutes.
3. optical routing equipment according to claim 2 is characterized in that, described first close/wave splitter device is an array waveguide grating.
4. optical routing equipment according to claim 1 and 2 is characterized in that, described splitter is the 1:N splitter.
5. optical routing equipment according to claim 1 and 2 is characterized in that, described splitter is the 1:N splitter that the above splitter series connection of two-stage or two-stage constitutes.
6. according to each described optical routing equipment in the claim 1 to 5, it is characterized in that described route device is the optical fiber cross matrix.
7. according to each described optical routing equipment in the claim 1 to 6, it is characterized in that,
Described route device can be that manual switchover, automatic switchover or Remote switch.
8. a passive optical network is characterized in that, comprising:
A plurality of optical line terminals use different wavelength;
Optical Distribution Network links to each other with described a plurality of optical line terminals, is used for the wavelength optical signals from described a plurality of optical line terminals at random is transferred to a plurality of non-colored light network element; And
Described a plurality of non-colored light network element is connected with described Optical Distribution Network, is used for by described Optical Distribution Network, selectively is connected with in described a plurality of optical line terminals any one, to carry out the bidirectional data transfers with described optical line terminal.
9. passive optical network according to claim 8 is characterized in that, described Optical Distribution Network further comprises:
Optical routing equipment, be used at random to output to from a plurality of wavelength optical signals of described a plurality of optical line terminals input any one of described a plurality of non-colored light network element, and will be transferred to corresponding described optical line terminal in the opposite direction from the light signal of each described non-colored light network element;
First optical fiber is used for described a plurality of optical line terminals are connected with described optical routing equipment, and the transmitted in both directions of carrying out light signal between described a plurality of optical line terminals and described optical routing equipment; And
A plurality of second optical fiber are used for described optical routing equipment is connected with described a plurality of non-colored light network element, and the transmitted in both directions of carrying out light signal between described optical routing equipment and described a plurality of non-colored light network element.
10. passive optical network according to claim 9 is characterized in that, described optical routing equipment comprises:
Close/wave splitter device, the optical multiplexed signal that is used for receiving is used and demultiplexing;
A plurality of splitters, the port of described a plurality of splitter one sides is connected with described closing/wave splitter device respectively, is used for the light signal that distributing receives; And
Route device links to each other with the port of the opposite side of described a plurality of splitters, is used for switching between different described output ports, described light signal is outputed to any one in described a plurality of non-colored light network element.
11. optical routing equipment according to claim 10 is characterized in that, described closing/wave splitter device by first close/wave splitter device and a plurality of second closes/wave splitter device constitutes.
12. passive optical network according to claim 11 is characterized in that, described first close/wave splitter device is an array waveguide grating.
13., it is characterized in that described splitter is the 1:N splitter according to claim 10 or 11 described passive optical networks.
14., it is characterized in that described route device is the optical fiber cross matrix according to each described passive optical network in the claim 10 to 15.
15. according to claim 9 or 10 described passive optical networks, it is characterized in that,
Any one optical line terminal in described a plurality of optical line terminal further comprises:
Switching Module is used for carrying out exchanges data with the upper level network;
The downlink module, be connected to described Switching Module, be used to export two descending light with different wave length, one of them described descending light is used to carry the downlink data from described Switching Module, another described descending unmodulated light of only not carrying data, as the light source of described non-colored light network element, and with mixed signal of described two descending light compositings; And
Up receiver module is used to receive the light signal from described Optical Distribution Network, and described light signal is converted to the signal of telecommunication, and the described signal of telecommunication is carried out demodulation to obtain sending to the data of described Switching Module.
16. passive optical network according to claim 15 is characterized in that, described downlink module further comprises:
Two light sources are used to export two descending light with different wave length;
Modulator is used to use from the data of described Switching Module the described descending light that is used to carry data is modulated; And
Coupler is connected to described modulator, is used for described two descending light are coupled.
17. according to claim 15 or 16 described passive optical networks, it is characterized in that,
Described downlink module also comprises: amplifier is used for amplifying at least one of described two descending light.
18. passive optical network equipment according to claim 15 is characterized in that, described up receiver module further comprises:
Optical-electrical converter is used for the light signal from the user is converted to the signal of telecommunication; And
Demodulator is connected to described optical-electrical converter, is used for the described signal of telecommunication is carried out demodulation to obtain sending to the data of described Switching Module.
19. passive optical network according to claim 8 is characterized in that, described non-colored light network element further comprises:
Channel-splitting filter is connected with described Optical Distribution Network, is used for from described light branch
A separate optical signals of distribution network becomes to have two light signals of different wave length, and one of them light signal carries user data, and another light signal does not have carrying user data;
The receiving demodulation device is connected with described channel-splitting filter, is used for demodulating downlink data from the described light signal that carries user data from described channel-splitting filter;
Switching Module is used for carrying out exchanges data with the user; And
Modulator is connected with described Switching Module, be used to use the upstream data from described Switching Module not have the light signal of carrying user data to modulate to described, and the light signal after will modulating sends to described Optical Distribution Network by described channel-splitting filter.
20. a method that is used for providing at same EPON a plurality of optical line terminals is characterized in that, said method comprising the steps of:
Step a will synthesize a mixed signal from the wavelength optical signals of described a plurality of optical line terminals;
Step b sends to Optical Distribution Network with described mixed signal;
Step c, described Optical Distribution Network are transferred to wavelength optical signals different optical network units as required, and will be transferred to corresponding optical line terminal in the opposite direction from the light signal of described different optical network unit; And
Steps d, described optical network unit receive and demodulation from the carrying of its corresponding optical line terminal the light signal of downlink data, recover user data, and user's upstream data is modulated in the downlink optical signal that does not carry data from corresponding optical line terminal, and transmit back described optical line terminal by described Optical Distribution Network.
21. method according to claim 20 is characterized in that, described step c is further comprising the steps of:
Wavelength optical signals is carried out multiplexing and demultiplexing;
The light signal that distributing receives; And
Between different described a plurality of optical network units, switch, described light signal is outputed to any one in described a plurality of optical network unit.
22., it is characterized in that described a plurality of optical line terminals adopt similar and different media access control protocol according to claim 20 or 21 described methods.
23. method according to claim 20 is characterized in that, if described a plurality of optical line terminal adopts different media access control protocols, then described a plurality of optical network units is connected respectively to compatible with it optical line terminal.
24. method according to claim 20, it is characterized in that, if described a plurality of optical line terminal adopts identical media access control protocol, then described a plurality of optical network units are connected respectively to any one in selected described a plurality of optical line terminals.
25. method according to claim 20 is characterized in that, described a plurality of optical line terminals are arranged in identical EPON.
26. method according to claim 20 is characterized in that, described a plurality of optical line terminals adopt the method for wavelength division multiplexing to use different up-downgoing wavelength right.
27. method according to claim 20 is characterized in that, can with described a plurality of optical network units by optical routing equipment respectively route be connected to separately in described a plurality of optical line terminals of selecting any one.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2006100874862A CN101087174B (en) | 2006-06-08 | 2006-06-08 | Passive optical network system and method of optical routing device and application optical routing device |
| PCT/CN2007/070079 WO2007143945A1 (en) | 2006-06-08 | 2007-06-04 | Wavelength routing module, system and method therewith |
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| WO2007143945A1 (en) | 2007-12-21 |
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