CN101237293A - Wave time division mixed multiplexing passive optical network system - Google Patents
Wave time division mixed multiplexing passive optical network system Download PDFInfo
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- CN101237293A CN101237293A CNA2008100076429A CN200810007642A CN101237293A CN 101237293 A CN101237293 A CN 101237293A CN A2008100076429 A CNA2008100076429 A CN A2008100076429A CN 200810007642 A CN200810007642 A CN 200810007642A CN 101237293 A CN101237293 A CN 101237293A
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Abstract
The invention discloses a wavelength-division time-division mixed multiplexing passive optical network system, which at least comprises an optical line terminal, an optical distribution network and a plurality of optical network units. The optical line terminal is used to send downlink optical signal wave bands of a plurality of services, make multiplexing wave coupling to the optical signal wave bands of the plurality of services, then allow the optical signal wave bands to enter the same single fiber and transmit the optical signal wave bands to the optical distribution network; the optical distribution network is used to demultiplex an optical signal which is received from the optical line terminal and wave-coupled, then makes multi-level selective download and transparent transmission to one or a plurality of optical signals after the demultiplexing, and makes power division of one or the plurality of demultiplexed optical signals to the optical network units; the optical network units are used to receive light signals of the plurality of services downloaded by the optical distribution network through a coupling fiber, and logically processes the optical signals. The wavelength-division time-division mixed multiplexing passive optical network system has the advantages of large single-fiber access capacity, low cost of network construction, easy operation maintenance and upgrade and so on.
Description
Technical field
The present invention relates to the Optical Access Network field, relate in particular to HPON (Wave time division mixed multiplexing passive optical network) technical field.
Background technology
Optical access network is the important component part of next generation network, also be following nearly ten time development communication technologies main direction.For satisfying the continuous growth of multiple business and technological incorporation development requirement, study new optical access network framework mode and new solution and have crucial meaning.
The development trend strong request of optical access network realizes " network integration " of multiple business such as video, data and voice and other potential particular services, for example, merge broadcasting or multicast service (as VOD, video request program etc.) and other the potential particular traffic requirements that inserts high bandwidth.
Present EPON/GPON (Ethernet passive optical network/gigabit passive optical network) technology can not finely satisfy the demand that increases rapidly of user bandwidth.Wherein, because the single fiber access capacity of EPON and GPON is restricted (having only 32 lines or 64 lines at present), when the central office terminal room is transregional when being provided with, need to lay OLT (optical line terminal) and the ONU (optical network unit) that tens of core fibres connect span 10～40km, not only construction cost and maintenance cost height, and can face the fine resource-constrained contradiction of access tube linear light.
Summary of the invention
In view of above-mentioned analysis, the present invention aims to provide the multiple services multistage Wave time division mixed multiplexing passive optical network system of a kind of carrying, in order to solve EPON construction cost and the high problem of maintenance cost that exists in the prior art.
System of the present invention comprises at least: optical line terminal, Optical Distribution Network and an a plurality of optical network unit,
Described optical line terminal is used to send the downlink optical signal wave band of multiple business when descending, and the light signal wave band of described multiple business is carried out multiplexing closing enters same single fiber behind the ripple and be transferred to Optical Distribution Network; The light signal wave band photoelectricity behind demultiplexing that is used for when simultaneously up receiving from Optical Distribution Network receives;
Described Optical Distribution Network, the light signal that closes behind the ripple that is used for when descending receiving from described optical line terminal carries out demultiplexing, then the one or more light signals behind the demultiplexing are carried out that multistage selectivity is downloaded and transparent transmission after, merit is given a plurality of described optical network units; Be used for when simultaneously up the uplink optical signal that described optical network unit sends converged and demultiplexing after, single fiber is sent to corresponding Optical Network Terminal;
Described optical network unit is used to receive the light signal of Optical Distribution Network through the following multiple business that passes of coupled fiber when descending, and described light signal is carried out logical process; Be used to send uplink optical signal to Optical Distribution Network when simultaneously up.
Further, each described optical line terminal specifically comprises: multi-wavelength multiplex optical transmission module, multi-wavelength demultiplexing Optical Receivers, specific transactions light signal sending module, plug-in specific transactions light signal sending module and wavelength division multiplexer, wherein,
Described multi-wavelength multiplex optical transmission module is used to send descending multiple wavelength optical signal wave band to wavelength division multiplexer;
Described multi-wavelength demultiplexing Optical Receivers is used to receive the up multiple wavelength optical signal wave band behind the wavelength division multiplexer demultiplexing;
Described specific transactions light signal sending module is used to send specific transactions light signal wave band to wavelength division multiplexer;
Described plug-in specific transactions light signal sending module is used to send plug-in specific transactions light signal wave band to wavelength division multiplexer;
Described wavelength division multiplexer, be used for described descending multiple wavelength optical signal wave band, described specific transactions light signal wave band and described plug-in certain optical signals wave band carry out multiplexing close ripple after, send to Optical Distribution Network through same single fiber.
Further, described optical line terminal also comprises:
Wideband light source is used to produce descending seed photo-signal, and sends circulator to;
Circulator, the described descending seed photo-signal that is used for importing is transferred to the wavelength division multiplexer of described optical line terminal, simultaneously the uplink optical signal of described passback is sent to the multi-wavelength multiplex Optical Receivers of described optical line terminal.
Further, described optical line terminal also comprises:
Two-way amplifier is used for the up modulated light signal through descending seed photo-signal of circulator and the passback of described optical network unit is carried out bi-directional light gain processing and amplifying.
Further, described Optical Distribution Network specifically comprises: multistage light download/transparent transmission multiplexer and multistage optical power distributor, wherein
Described light download/transparent transmission multiplexer, the multiple business light signal wave band that is used for coming from the optical line terminal transmission when descending carry out selectivity to be downloaded and transparent transmission, and exports by download port and transparent transmission port respectively; Be used for carrying out the uplink optical signal after converging through optical power distributor multiplexing when simultaneously up.
Described optical power distributor is used for the light signal wave band that needs are downloaded is told and downloaded the optical band signal that number of wavelengths equates and deliver to each optical network unit; The uplink optical signal that is used for receiving from optical network unit when simultaneously up carries out sending to light download/transparent transmission multiplexer after the convergence processing.
Further, described Optical Distribution Network can also comprise multistage All Optical Wave Converter, and described All Optical Wave Converter combines with described light download/transparent transmission multiplexer, is used to carry out up light wavelength conversion.
Further, described light download/transparent transmission multiplexer specifically comprises: the input port wavelength division multiplexer, on/download port wavelength division multiplexer, transparent transmission port wavelength division multiplexer and optical power distributor, wherein,
Described input port wavelength division multiplexer is used for light signal demultiplexing output that needs are downloaded when descending, deliver to respectively corresponding on/the download port wavelength division multiplexer, the light signal that needs transparent transmission is delivered to corresponding transparent transmission port wavelength division multiplexer; Simultaneously specific transactions light signal wave band and plug-in specific transactions light signal wave band are carried out sending described optical power distributor to behind the demultiplexing; Be used for when simultaneously up carrying out the uplink optical signal of passback multiplexing;
Described optical power distributor, be used for specific transactions light signal wave band and plug-in specific transactions light signal wave band told with downloading the optical wavelength that number of wavelengths equates and deliver to each download port wavelength division multiplexer, simultaneously specific transactions light signal wave band and plug-in specific transactions light signal wave band are told the light section that equates with the transparent transmission number of wavelengths and delivered to each transparent transmission port wavelength division multiplexer and close ripple output with the wavelength signals that needs transparent transmission; After converging, the uplink optical signal that is used for returning when simultaneously up sends to described input port wavelength division multiplexer;
On described/and the download port wavelength division multiplexer, be used for when descending and will tell through described optical power distributor and download light signal wave band that number of wavelengths equates light signal and close ripple and export with needs download; The uplink optical signal of up time network element passback sends to described input port wavelength division multiplexer through last load port wavelength division multiplexer;
Described transparent transmission port wavelength division multiplexer will be told light signal that the light signal wave band that equates with the transparent transmission number of wavelengths and needs download through optical power distributor and close ripple and export; Be used for when simultaneously up the uplink optical signal of passback is sent to described input port wavelength division multiplexer.
Further, described optical network unit specifically comprises: sending module, clean culture receiver module, specific transactions optical signal receiving module, plug-in specific transactions optical signal receiving module and exchange processing logic unit are uploaded in wavelength division multiplexer, clean culture, wherein,
Described wavelength division multiplexer, when descending, described wavelength division multiplexer is used for after carrying out demultiplexing through descending light signal, specific transactions light signal, the plug-in specific transactions light signal of coupling single fiber, controlled partial wave is independent downlink optical signal, specific transactions light signal and plug-in specific transactions light signal, reaches clean culture receiver module, specific transactions optical signal receiving module and plug-in specific transactions optical signal receiving module respectively successively; When up, the unicast signal that described wavelength division multiplexer is used for uploading carries out sending to Optical Distribution Network after multiplexing;
Described plug-in specific transactions optical signal receiving module is used for directly exporting plug-in specific transactions light signal to subsystem through the opto-electronic conversion interface;
Described clean culture receiver module, the descending unicast signal after being used to receive sends the exchange logic processing unit to;
Described specific transactions optical signal receiving module is used for the specific transactions light signal through opto-electronic conversion and reach exchange processing logic unit;
Described exchange logic processing unit, the descending unicast signal and the specific transactions light signal that are used for receiving carry out logical process, and the concurrent traveling optical signal of serving is uploaded sending module to clean culture;
Sending module is uploaded in described clean culture, and the unicast signal that is used for receiving sends to described wavelength division multiplexer.
Alternatively, described optical network unit specifically comprises: wavelength division multiplexer, far-end reflective semiconductor optical amplifier, clean culture receiver module, specific transactions optical signal receiving module, plug-in specific transactions optical signal receiving module and exchange processing logic unit, wherein,
Described wavelength division multiplexer, when descending, described wavelength division multiplexer is used for after carrying out demultiplexing through descending light signal, specific transactions light signal, the plug-in specific transactions light signal of coupling single fiber, controlled partial wave is independent downlink optical signal, specific transactions light signal and plug-in specific transactions light signal, reaches clean culture receiver module, specific transactions optical signal receiving module and plug-in specific transactions optical signal receiving module respectively successively; When up, the unicast signal that described wavelength division multiplexer is used for uploading carries out sending to Optical Distribution Network after multiplexing;
Described plug-in specific transactions optical signal receiving module is used for directly exporting plug-in specific transactions light signal to subsystem through the opto-electronic conversion interface;
Described clean culture receiver module, the descending unicast signal after being used to receive sends the exchange logic processing unit to;
Described specific transactions optical signal receiving module is used for specific transactions light signal opto-electronic conversion and reaches exchanging the processing logic unit;
Described exchange logic processing unit, the descending unicast signal and the specific transactions light signal that are used for receiving carry out logical process, and the concurrent traveling optical signal of serving is given described far-end reflective semiconductor optical amplifier;
Described far-end reflective semiconductor optical amplifier, the uplink optical signal that is used for receiving sends to wavelength division multiplexer.
Beneficial effect of the present invention is as follows: the present invention inserts by multi-services such as data single broadcasting light signal, specific transactions light signal Δ λ 1, plug-in specific transactions light signal Δ λ 2 being adopted the coupling of different frequency range window single fiber respectively, wave band is broadcast in each wavelength-division territory network and transmits separately, has improved multiple services efficiency of transmission greatly.The HPON that the TDM-PON of two-forty and the WDM-PON of multi-wavelength combine, by realizing brand-new multistage EPON architectural framework, the system that makes has splendid dilatancy, opening, reliability and large-scale application.And compared with prior art, the present invention has that the single fiber access capacity is big, network construction cost is low, be easy to advantages such as operation maintenance and upgrading.
Other features and advantages of the present invention will be set forth in the following description, and becoming apparent from specification of part perhaps understood by implementing the present invention.Purpose of the present invention and other advantages can realize and obtain by specifically noted structure in the specification of being write, claims and accompanying drawing.
Description of drawings
Fig. 1 is the basic structure schematic diagram of Wave time division mixed multiplexing passive optical network system of the present invention;
Fig. 2 is among the present invention, the structural representation of light download/transparent transmission multiplexer;
Fig. 3 is among the present invention, the structural representation of described optical network unit;
Fig. 4 is the structural representation of the described Wave time division mixed multiplexing passive optical network system of first embodiment of the invention;
Fig. 5 is the structural representation of the described Wave time division mixed multiplexing passive optical network system of second embodiment of the invention;
Fig. 6 is in the second embodiment of the invention, and All Optical Wave Converter is in conjunction with light download/transparent transmission multiplexer internal structure schematic diagram.
Embodiment
Specifically describe preferential embodiment of the present invention below in conjunction with accompanying drawing.For purpose clear and that simplify, when it may make theme of the present invention smudgy, with the detailed specific descriptions of known function and structure in the omission system described herein.
As shown in Figure 1, Fig. 1 is the basic structure schematic diagram of Wave time division mixed multiplexing passive optical network of the present invention, and described Wave time division mixed multiplexing passive optical network comprises at least: an OLT (optical line terminal), ODN (Optical Distribution Network) and a plurality of ONU (optical network unit).Below in order to narrate conveniently, the present invention is that example describes with one of them optical line terminal only.At down direction, the descending transmission wavelength of optical line terminal is λ
DLight signal (λ
D1～λ
Dn), specific transactions light signal Δ λ
1(λ
1～i), plug-in specific transactions light signal Δ λ
2(λ
2～j), through multiplexing close ripple after to the single fiber downlink transfer; In Optical Distribution Network through light download/transparent transmission multiplexer with different light wavelength lambda
D, Δ λ
1, Δ λ
2Download/transparent transmission, and respectively through the coupling single fiber be sent to optical power distributor, by optical network unit to clean culture light signal, specific transactions light signal Δ λ '
1 (1～i (k)), plug-in specific transactions light signal Δ λ '
2 (2～j (k))Through the wavelength division multiplexer demultiplexing.At up direction, the wavelength that sends for each optical-fiber network is λ
UUplink optical signal, after optical power distributor converges, transmit through light download/transparent transmission multiplexer again by single fiber, again by wavelength division multiplexer to the optical wavelength demultiplexing, and deliver to the up light-receiving port of optical line terminal.So just realized that single fiber carries multiple services multistage wavelength-division and time-division multiplexing mixed optical network system architecture.
Below the structure and the function of the optical line terminal in the embodiment of the invention, Optical Distribution Network and optical network unit is elaborated respectively.
Optical line terminal, when descending, described optical line terminal is transferred to Optical Distribution Network by same single fiber after multiple business signal (comprising multiple wavelength optical signal, specific transactions light signal, plug-in specific transactions light signal etc.) is closed the ripple processing; When simultaneously up, described optical line terminal is used to receive the uplink optical signal that each optical network unit sends through the Optical Distribution Network single fiber.
Described optical line terminal specifically can comprise: being used to send wave band is Δ λ
1(λ
1～i) the specific transactions light signal specific transactions light signal sending module, to be used to send wave band be λ
D(λ
D1～λ
Dn) light signal the multi-wavelength multiplex optical transmission module, to be used to receive optical network unit be λ through the up wave band of Optical Distribution Network
U(λ
U1～λ
Un) uplink optical signal the multi-wavelength multiplex Optical Receivers, to be used to send wave band be Δ λ
2(λ
2～j) the plug-in specific transactions light signal sending module of plug-in specific transactions light signal, and be used for above-mentioned multiple business signal is carried out the multiplexing wavelength division multiplexer that closes ripple or demultiplexing.
Optical Distribution Network, when descending, described Optical Distribution Network is used for the light signal wave band that optical line terminal sends over through single fiber carried out that selectivity is downloaded and transparent transmission, will download respectively then and after the light signal of transparent transmission carries out the merit branch, sends to a plurality of optical network units; When simultaneously up, described Optical Distribution Network be used for the described uplink optical signal that described optical network unit is sent converged and demultiplexing after, single fiber is sent to corresponding Optical Network Terminal.
Described Optical Distribution Network specifically can comprise: multistage ODTM (light download/transparent transmission multiplexer) and POC (optical power distributor).When descending, the wave band that light download/transparent transmission multiplexer will need to download from the light signal wave band that optical line terminal receives is exported to optical power distributor by download port, by branching ratio is 1: the optical power distributor of m carries out the wave band of download port output to deliver to m optical network unit respectively after merit is divided, and is left to need the wave band of transparent transmission to export to next stage light download/transparent transmission multiplexer by transparent transmission port.According to requirement of engineering, next stage light download/transparent transmission multiplexer also can adopt same processing mode, its wave band of receiving is carried out secondary to be downloaded and transparent transmission, part wave band is exported by download port, another part wave band is exported by transparent transmission port, by that analogy, constitute multistage EPON by this.When up, be λ for the wave band of the up transmission of a plurality of optical network units
U(λ
U1～λ
Un) uplink optical signal, after converging by optical power distributor,, transmit through the light multi-wavelength demultiplexing Optical Receivers of wavelength division multiplexer optical wavelength demultiplexing by the coupling single fiber and to receive to optical line terminal through light download/transparent transmission multiplexer, finally deliver to MAC and carry out logical process.Be the explanation that example is carried out with the two-stage EPON only among the present invention, but it will be recognized by those skilled in the art that system of the present invention can be the multistage EPON more than the two-stage, principle is identical, repeats no more herein.
Wherein, the structure of the light download/transparent transmission multiplexer in the described Optical Distribution Network (next stage light download/transparent transmission multiplexer) as shown in Figure 2, its by the input port wavelength division multiplexer, on/download port wavelength division multiplexer, transparent transmission port wavelength division multiplexer and branching ratio are 1: the optical power distributor of n (n is a number of wavelengths) constitutes.When descending, a plurality of wavelength (de) multiplexings that the input port wavelength division multiplexer will need to download are exported, and deliver to corresponding download port wavelength division multiplexer respectively, with one or more download wavelength (λ of needs download
D1～λ
Di) by download port output, will need one or more transparent transmission wavelength (λ of transparent transmission simultaneously
Di～λ
Dn) deliver to the transparent transmission port wavelength division multiplexer; Wherein, specific transactions light signal Δ λ
1, plug-in specific transactions light signal Δ λ
2Also by input port wavelength division multiplexer demultiplexing, and by branching ratio is 1: the optical power distributor of n (n is a number of wavelengths) is told and is downloaded light signal wave band that number of wavelengths equates and deliver to the unicast signal of each download port wavelength division multiplexer and transparent transmission and close ripple output.The wavelength signals of download port output is 1 by branching ratio in the Optical Distribution Network again: the optical power distributor of m is delivered to m optical network unit respectively; The light signal wave band of transparent transmission port output is delivered to next stage light download/transparent transmission multiplexer.Constitute multistage passive optical distribution network whereby.When up, the uplink optical signal that is returned by optical network unit sends to the input port wavelength division multiplexer by transparent transmission port wavelength division multiplexer and last load port wavelength division multiplexer respectively.If on/the download port number is consistent with single fiber reuse wavelengths number, then transparent transmission port can be designed to the dilatation port, and it is standby to give over to network upgrade.
Therefore, the network architecture of the present invention had both had wavelength division multiplexing and the multistage property of time-multiplexed EPON bandwidth dilatation in the vertical, also had various voltinism, compatibility and the upgradability etc. that transversely adapt to the different types of multi-service multi-user of concrete actual light Access Network demand.
Optical network unit, described optical network unit are used to receive the light signal of Optical Distribution Network multiple business of biography under coupled fiber when descending; Be used to send uplink optical signal to Optical Distribution Network when simultaneously up.
The structure of described optical network unit specifically as shown in Figure 3, can comprise: sending module, clean culture receiver module, specific transactions optical signal receiving module, plug-in specific transactions optical signal receiving module and exchange processing logic unit are uploaded in wavelength division multiplexer, clean culture, wherein
The λ that Optical Distribution Network coupling single fiber passes down
DLight signal, specific transactions Δ λ '
1(λ
1～i (k) signal, plug-in specific transactions Δ λ '
2(λ
2～j (k)), controlled partial wave is independent λ behind the wavelength division multiplexer demultiplexing
DiFollowing biography light signal, specific transactions Δ λ '
1Signal and plug-in specific transactions Δ λ '
2Signal reaches clean culture receiver module, specific transactions optical signal receiving module and plug-in specific transactions receiver module respectively successively, wherein plug-in specific transactions Δ λ '
2Signal directly exports subsystem to through the opto-electronic conversion interface, and the following leaflet after receiving is broadcast λ
Di, specific transactions Δ λ '
1Signal reaches exchange processing logic unit to carry out generating up unicast signal λ after the logical process
Ui, described up unicast signal is uploaded sending module and wavelength division multiplexer returns to Optical Distribution Network through clean culture.
It is pointed out that clean culture reception optical module and normal optical receiver module without any difference, after the employing photo-detector converts opto-electronic conversion, amplify the back outputting standard signal of telecommunication through preposition amplification and amplitude limit again.
Finally, by the multiple services multistage Wave time division mixed multiplexing passive optical network system of carrying proposed by the invention, realized the single fiber transmission of multiple business such as light signal, specific transactions light signal, plug-in specific transactions light signal, in reasonably optimizing Internet resources as far as possible, greatly improved the efficiency of transmission of multiple business again, highly beneficial for the city access network that conduit resource is limited.
What need statement is, based on the multistage Wave time division mixed multiplexing passive optical network system architectural schemes principle of carrying multiple business involved in the present invention, also can adopt the fine transmission separately of branch of clean culture light signal, specific transactions light signal, plug-in specific transactions light signal.Concrete system schema can be decided according to concrete network demand and actual engineering construction situation.In addition, based on our system architecture characteristics, in last/downstream band planning, row and compatible is flexibly arranged well.
Embodiment is further elaborated the described system of the embodiment of the invention below in conjunction with two examples for a better understanding of the present invention.
As shown in Figure 4, Fig. 4 be first embodiment of the invention based on local BLS (wideband light source) in conjunction with the multiple services multistage hybrid wavelength-division and time-division multiplexing passive optical-fiber network of the carrying of far-end RSOA (reflective semiconductor optical amplifier)) structural representation of system, this scheme adopts the controlled tranmission techniques of single fiber partial wave, promptly utilizes an optical fiber to transmit up-downgoing multiple wavelength optical signal wave band λ
D(λ
D1～λ
Dn), specific transactions light signal wave band Δ λ
1And plug-in specific transactions light signal wave band Δ λ
2Etc. a plurality of wave band optical signals.
In local side Optical Network Terminal side, optical line terminal comprises: multi-wavelength multiplex optical transmission module, multi-wavelength multiplex Optical Receivers, specific transactions light signal sending module, plug-in specific transactions light signal sending module and BLS (wideband light source), wherein,
When descending, it is λ that the multi-wavelength multiplex optical transmission module sends wave band
DMulti-wavelength multiplex light signal, specific transactions light signal sending module to send wave band be Δ λ
1Specific transactions light signal, plug-in specific transactions light signal sending module to send wave band be Δ λ
2Plug-in specific transactions light signal, wideband light source sends seed photo-signal, arrive wavelength division multiplexer through circulator (C) and bidirectional optical amplifier, by wavelength division multiplexer multi-wavelength multiplex signal, specific transactions light signal, plug-in specific transactions light signal and seed photo-signal are closed ripple and handle, close and enter same monomode fiber behind the ripple and be transferred to Optical Distribution Network.Wherein the seed photo-signal of BLS generation and the up modulated light signal of passback can also be amplified by a DOA (bidirectional optical amplifier).
According to concrete network engineering actual demand, unicast signal and specific transactions light signal Δ λ
1(λ
1～i) downstream signal also can be by another image intensifer (OA) amplification, this place repeats no more.
In Optical Distribution Network, one or more band channel that light download/transparent transmission multiplexer will need to download are exported by download port, and all the other band channel light are exported by transparent transmission port; The band signal light of download port output is delivered to a plurality of optical network units respectively by optical power distributor again; According to the network engineering needs, the light signal of transparent transmission port output can be delivered to next stage light download/transparent transmission multiplexer, and the tunable optical power splitter also can be divided into multistagely, and then constitutes multistage passive optical distribution network.
At optical network unit, the far-end reflective semiconductor optical amplifier receives the some wavelength pump light (λ behind the local side wideband light source demultiplexing
i), and reflect up passback after modulating.Utilize WDM to realize the multiplexing or demultiplexing of reflective semiconductor optical amplifier, unicast signal, specific transactions light signal and specific transactions light signal.
More than be the transfer of data flow process of the described system descending direction of first embodiment of the invention, its up transfer of data flow process is: plug-in specific transactions Δ λ '
2Signal directly exports subsystem to through the opto-electronic conversion interface, and the following leaflet that the clean culture receiver module receives is broadcast signal λ
DiSpecific transactions Δ λ ' with the reception of specific transactions optical signal receiving module
1Light signal reaches exchange processing logic unit to carry out generating up unicast signal λ after the logical process
Ui, the uplink optical signal (λ that each optical network unit sends
U1～λ
Un) again by wavelength division multiplexer, bidirectional optical amplifier and the circulator of far-end reflective semiconductor optical amplifier, deliver to the multi-wavelength light receiver module of optical line terminal through Optical Distribution Network, optical line terminal.
Because reflective semiconductor optical amplifier is the image intensifer of wide range, promptly irrelevant with incident wavelength in certain wave-length coverage, so just realized (" colourless " work of λ-RIU) of user's remote interface unit.Embodiment one scheme can be according to the demand of real network engineering construction, rationally and efficiently the configuration network resource.By multistage Wave time division mixed multiplexing passive optical network framework,, satisfied the diversified demand of real network engineering construction again neatly in the multiple services while of carrying.Simultaneously can on the basis that reduces cost effectively, realize the system architecture of full light passive network again.This framework to the multistage passive optical network of at present existing EPON technology carrying multi-service has considerable meaning.
As shown in Figure 5, Fig. 5 is the structural representation of the described another kind of second embodiment of the invention based on the multiple services multistage hybrid wavelength-division and time-division multiplexing passive optical network system of carrying of AOWC (All Optical Wavelength Conversion).Second embodiment of the invention also can adopt the controlled tranmission techniques of single fiber partial wave, promptly utilizes an optical fiber to transmit up unicast signal, descending unicast signal, specific transactions light signal and plug-in specific transactions light signal.
At the local side optical line terminal, the multi-wavelength light sending module of a plurality of time division multiplexing PON ports sends light signal λ
D1～λ
DnWith multi-wavelength light receiver module receiving optical signals λ
U1～λ
Un, specific transactions light signal λ
1～iAnd plug-in specific transactions light signal λ
2～jClose ripple by wavelength division multiplexer and enter same monomode fiber transmission.Equally can be according to the actual demand of concrete network engineering, wherein unicast signal and specific transactions light signal downstream signal are amplified by an image intensifer (OA).Herein, also no longer specifically give unnecessary details.
In Optical Distribution Network, one or more band channel that All Optical Wave Converter and light download/transparent transmission multiplexer will need to download are exported by download port, and all the other band channel are exported by transparent transmission port; The wave band optical signal of download port output is delivered to a plurality of optical network units respectively by optical power distributor again; According to the network engineering needs, the light signal of transparent transmission port output can be delivered to next stage All Optical Wave Converter and light download/transparent transmission multiplexer, and network system also can be divided into multistagely through the tunable optical power splitter, can constitute multistage passive optical distribution network thus.
At optical network unit, utilize wavelength division multiplexer to realize that clean culture sends light signal, clean culture reception, specific transactions light signal Δ λ '
1(λ
1～i (k)) and specific transactions light signal Δ λ '
2(λ
2～j (k)) wait the multiplexing or demultiplexing of different-waveband light signal.
Uplink optical signal (the λ of each optical network unit
U1～λ
Un) directly be converted to the pairing different wave length of this PON port through All Optical Wave Converter, deliver to the multi-wavelength light receiver module again.
In the second embodiment of the invention, when needs carry out wavelength Conversion, only need on the light path corresponding with Wavelength-converting All Optical Wave Converter to be set and get final product, its concrete structure as shown in Figure 6.
The All Optical Wave Converter of Optical Distribution Network directly is converted to the pairing different wave length of this PON port with the uplink optical signal wavelength of different PON port optical network units, can guarantee " full light " characteristic of Optical Access Network.
Therefore, second embodiment of the invention can be according to the demand of real network engineering construction, rationally and efficiently the configuration network resource.By multistage Wave time division mixed multiplexing passive optical network framework,, satisfied the diversified demand of real network engineering construction again neatly in the multiple services while of carrying.On the basis that reduces cost effectively, can realize long optical access network system framework simultaneously apart from transmission network.This to the present multistage length of existing GPON technology carrying multi-service apart from the framework of transmission network a kind of splendid alternative of can yet be regarded as.Also it is pointed out that simultaneously because AOWC is an active device, therefore require the ODN optical node to possess condition of power supply.
Above-described two embodiment only are used to illustrate the present invention, and limit the present invention by no means.Such as, specific transactions light signal λ
1～iCan be clean culture or multicast and other potential particular traffic requirements etc. of big branching ratio, simultaneously plug-in specific transactions light signal λ
2～jCan be clean culture or CATV (cable TV) and other potential specific transactions of big branching ratio, and be not to be restricted to certain business data flow, such as multicast or cable TV etc.
In sum, the invention provides the multiple services multistage Wave time division mixed multiplexing passive optical network system of a kind of carrying, by multi-services such as data single broadcasting light signal, specific transactions light signal Δ λ 1, plug-in specific transactions light signal Δ λ 2 being adopted the coupling of different frequency range window single fiber insert respectively, wave band is broadcast in each wavelength-division territory network and transmits separately, has improved multiple services efficiency of transmission greatly.The HPON that the TDM-PON of two-forty and the WDM-PON of multi-wavelength combine, by realizing brand-new multistage EPON architectural framework, the system that makes has splendid dilatancy, opening, reliability and large-scale application prospect etc.Compare with conventional solution, it has, and the single fiber access capacity is big, network construction cost is low, be easy to series of advantages such as operation maintenance and upgrading, especially for Wave division and time division passive optical network of future generation system a kind of flexible solution that has feasibility of can yet be regarded as.
The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claims.
Claims (9)
1, a kind of Wave time division mixed multiplexing passive optical network system is characterized in that, comprises at least: optical line terminal, Optical Distribution Network and an a plurality of optical network unit,
Described optical line terminal is used to send the downlink optical signal wave band of multiple business when descending, and the light signal wave band of described multiple business is carried out multiplexing closing enters same single fiber behind the ripple and be transferred to Optical Distribution Network; The light signal wave band photoelectricity behind demultiplexing that is used for when simultaneously up receiving from Optical Distribution Network receives;
Described Optical Distribution Network, the light signal that closes behind the ripple that is used for when descending receiving from described optical line terminal carries out demultiplexing, then the one or more light signals behind the demultiplexing are carried out that multistage selectivity is downloaded and transparent transmission after, merit is given a plurality of described optical network units; Be used for when simultaneously up the uplink optical signal that described optical network unit sends converged and demultiplexing after, single fiber is sent to corresponding Optical Network Terminal;
Described optical network unit is used to receive the light signal of Optical Distribution Network through the following multiple business that passes of coupled fiber when descending, and described light signal is carried out logical process; Be used to send uplink optical signal to Optical Distribution Network when simultaneously up.
2, system according to claim 1, it is characterized in that, each described optical line terminal specifically comprises: multi-wavelength multiplex optical transmission module, multi-wavelength demultiplexing Optical Receivers, specific transactions light signal sending module, plug-in specific transactions light signal sending module and wavelength division multiplexer, wherein
Described multi-wavelength multiplex optical transmission module is used to send descending multiple wavelength optical signal wave band to wavelength division multiplexer;
Described multi-wavelength demultiplexing Optical Receivers is used to receive the up multiple wavelength optical signal wave band behind the wavelength division multiplexer demultiplexing;
Described specific transactions light signal sending module is used to send specific transactions light signal wave band to wavelength division multiplexer;
Described plug-in specific transactions light signal sending module is used to send plug-in specific transactions light signal wave band to wavelength division multiplexer;
Described wavelength division multiplexer, be used for described descending multiple wavelength optical signal wave band, described specific transactions light signal wave band and described plug-in certain optical signals wave band carry out multiplexing close ripple after, send to Optical Distribution Network through same single fiber.
3, system according to claim 2 is characterized in that, described optical line terminal also comprises:
Wideband light source is used to produce descending seed photo-signal, and sends the circulator input port to;
Circulator, the described descending seed photo-signal that is used for importing is transferred to the wavelength division multiplexer of described optical line terminal, simultaneously the uplink optical signal of described passback is sent to the multi-wavelength multiplex Optical Receivers of described optical line terminal.
4, system according to claim 3 is characterized in that, described optical line terminal also comprises:
Two-way amplifier is used for the uplink optical signal through descending seed photo-signal of circulator and the passback of described optical network unit is carried out bi-directional light gain processing and amplifying.
5, system according to claim 1 is characterized in that, described Optical Distribution Network specifically comprises: multistage light download/transparent transmission multiplexer and multistage optical power distributor, wherein
Described light download/transparent transmission multiplexer, the multiple business light signal wave band that is used for coming from the optical line terminal transmission when descending carry out selectivity to be downloaded and transparent transmission, and exports by download port and transparent transmission port respectively; Be used for carrying out the uplink optical signal after converging through optical power distributor multiplexing when simultaneously up;
Described optical power distributor is used for the light signal wave band that needs are downloaded is told and downloaded the optical band signal that number of wavelengths equates and deliver to each optical network unit; The uplink optical signal that is used for receiving from optical network unit when simultaneously up carries out being sent to light download/transparent transmission multiplexer after the convergence processing.
6, system according to claim 5 is characterized in that, described Optical Distribution Network also comprises multistage All Optical Wave Converter,
Described All Optical Wave Converter combines with described light download/transparent transmission multiplexer, is used to carry out the uplink optical signal wavelength Conversion.
7, system according to claim 5 is characterized in that, described light download/transparent transmission multiplexer specifically comprises: the input port wavelength division multiplexer, on/download port wavelength division multiplexer, transparent transmission port wavelength division multiplexer and optical power distributor, wherein,
Described input port wavelength division multiplexer, the multi-service light signal wave band demultiplexing that is used for when descending needs are downloaded is exported, on being sent to accordingly respectively/and the download port wavelength division multiplexer, will need the multi-service light signal wave band of transparent transmission to be sent to corresponding transparent transmission port wavelength division multiplexer; Simultaneously specific transactions light signal wave band and plug-in specific transactions light signal wave band are carried out sending described optical power distributor to behind the demultiplexing; Be used for when simultaneously up carrying out the uplink optical signal of passback multiplexing;
Described optical power distributor, be used for specific transactions light signal wave band and plug-in specific transactions light signal wave band told with downloading the light section that number of wavelengths equates and deliver to each download port wavelength division multiplexer, simultaneously specific transactions light signal wave band and plug-in specific transactions light signal wave band are told the light section that equates with the transparent transmission number of wavelengths and delivered to each transparent transmission port wavelength division multiplexer and close ripple output with the wavelength signals that needs transparent transmission; After converging, the uplink optical signal that is used for returning when simultaneously up sends to described input port wavelength division multiplexer;
On described/and the download port wavelength division multiplexer, be used for when descending and will tell through described optical power distributor and download light signal wave band that number of wavelengths equates light signal and close ripple and export with needs download; The uplink optical signal of up time network element passback sends described input port wavelength division multiplexer to through last load port wavelength division multiplexer;
Described transparent transmission port wavelength division multiplexer will be told light signal that the light signal wave band that equates with the transparent transmission number of wavelengths and needs download through optical power distributor and close ripple and export; Be used for when simultaneously up sending the uplink optical signal of passback to described input port wavelength division multiplexer.
8, system according to claim 1 and 2, it is characterized in that, described optical network unit specifically comprises: sending module, clean culture receiver module, specific transactions optical signal receiving module, plug-in specific transactions optical signal receiving module and exchange processing logic unit are uploaded in wavelength division multiplexer, clean culture, wherein
Described wavelength division multiplexer, when descending, described wavelength division multiplexer is used for after carrying out demultiplexing through descending light signal, specific transactions light signal, the plug-in specific transactions light signal of coupling single fiber, controlled partial wave is independent downlink optical signal, specific transactions light signal and plug-in specific transactions light signal, reaches clean culture receiver module, specific transactions optical signal receiving module and plug-in specific transactions optical signal receiving module respectively successively; When up, the unicast signal that described wavelength division multiplexer is used for uploading carries out sending Optical Distribution Network to after multiplexing;
Described plug-in specific transactions receiver module is used for directly exporting plug-in specific transactions light signal to subsystem through the opto-electronic conversion interface;
Described clean culture receiver module, the descending clean culture light signal after being used to receive sends the exchange logic processing unit to;
Described specific transactions receiver module is used for the specific transactions light signal through opto-electronic conversion and deliver to exchange processing logic unit;
Described exchange logic processing unit, the descending unicast signal and the specific transactions light signal that are used for receiving carry out logical process, and the concurrent traveling optical signal of serving is uploaded sending module to clean culture;
Sending module is uploaded in described clean culture, and the unicast signal that is used for receiving sends to described wavelength division multiplexer.
9, according to claim 3 or 4 described systems, it is characterized in that, described optical network unit specifically comprises: wavelength division multiplexer, far-end reflective semiconductor optical amplifier, clean culture receiver module, specific transactions optical signal receiving module, plug-in specific transactions receiver module and exchange processing logic unit, wherein
Described wavelength division multiplexer, when descending, described wavelength division multiplexer is used for after carrying out demultiplexing through descending light signal, specific transactions light signal, the plug-in specific transactions light signal of coupling single fiber, controlled partial wave is independent downlink optical signal, specific transactions light signal and plug-in specific transactions light signal, reaches clean culture receiver module, specific transactions optical signal receiving module and plug-in specific transactions receiver module respectively successively; When up, the unicast signal that described wavelength division multiplexer is used for uploading carries out sending to Optical Distribution Network after multiplexing;
Described plug-in specific transactions receiver module is used for directly exporting plug-in specific transactions light signal to subsystem through the opto-electronic conversion interface;
Described clean culture receiver module, the descending unicast signal after being used to receive sends the exchange logic processing unit to;
Described specific transactions receiver module is used for the specific transactions light signal through opto-electronic conversion and reach exchange processing logic unit;
Described exchange logic processing unit, the descending unicast signal and the specific transactions light signal that are used for receiving carry out logical process, and the concurrent traveling optical signal of serving is given described far-end reflective semiconductor optical amplifier;
Described far-end reflective semiconductor optical amplifier, the uplink optical signal that is used for receiving sends to wavelength division multiplexer.
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