CN104768086B - The method and device of optical network unit intercommunication - Google Patents
The method and device of optical network unit intercommunication Download PDFInfo
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- CN104768086B CN104768086B CN201410005671.7A CN201410005671A CN104768086B CN 104768086 B CN104768086 B CN 104768086B CN 201410005671 A CN201410005671 A CN 201410005671A CN 104768086 B CN104768086 B CN 104768086B
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Abstract
The invention discloses in a kind of optical line terminal in the PON of communication network be used for optical network unit intercommunication device and method, including：1 × 2 photoswitch, tool is there are one input terminal and first, second output terminal, for switching the optical signal of the communication of the data between the optical signal of upstream data and optical network unit；N × n photoswitches, with n input terminal and n output terminal, n input terminal comes from the optical signal of the second output terminal of 1 × 2 photoswitch of the optical line terminal in each source PON for reception respectively, the ring of light that n output terminal is used to the optical signal of merging being respectively sent in the optical line terminal being located in each source PON or target PON returns device, is mainly used for the data of the optical network unit of source PON being switched to the optical network unit of target PON；Do not increasing extra fiber and optical network unit transmitter, being in communication with each other between the optical network unit of PON has been neatly realized.
Description
Technical field
The present invention relates to the passive optical network in communication network, more particularly, to the optical-fiber network in passive optical network
The method and device of unit intercommunication.
Background technology
Cooperative multipoint transmission (Co-ordinate MultiPoint：CoMP) technology as LTE an important application
Through having carried out extensive discussion in LTE.Due to its allow different eNB cooperative controls interfere and/or participate in joint send and
It receives, cooperative multipoint transmission technology can effectively improve the handling capacity of LTE-A user.But cooperative multipoint transmission technology needs to lead to
The exchange that mobile retransmission network carries out user data and/or cell information is crossed, so the performance boost of cooperative multipoint transmission is very
The ability of mobile retransmission network is depended in big degree.In the cooperative multipoint transmission technology, intercell information and/or data
Exchange is carried out between adjacent base station.And the X2 interface in the logic interfacing between two base stations, i.e. 3GPP, for this
The interaction of kind intercell information and/or data.
According to some current research reports, generally delay of the requirement no more than several milliseconds of cooperative multipoint transmission technology and
Data capacity can reach several Gbps.Therefore, low latency and high bandwidth become a bottleneck for realizing cooperative multipoint transmission technology,
Because it cannot fully meet cooperative multipoint transmission technology to data and/or information interchange requirement.In addition, between Future cellular networks
More frequent switching is also required to bigger, faster information interchange and higher inter-base station interface handling capacity.
In view of its huge superiority bandwidth and extensive deployment, passive optical network (Passive Optical Network：
PON) it is cost-effective to be ensured to be the offer of cooperative multipoint transmission technology to be always treated as most promising solution for access technology
Mobile retransmission.Particularly, optical network unit (Optical Network Unit：ONU the full light interworking technology between) can be real
Direct communication between existing optical network unit, without complicated photoelectricity light (Optical-Electrical-Optical：OEO) turn
Change with other Electric signal processings, this is one and supports the delay less than 1ms and speed more than 1Gb/s in cooperative multipoint transmission technology
The very attractive solution of rate bandwidth.
About the communication between the optical network unit of full light, current achievement in research is concentrated mainly on the optical-fiber network in the PON of source
Unit intercommunication.However, in practice, the optical network unit being in communication with each other generally falls into different PON, and these
Remote node in PON may be in different positions.In this case, the light net between different PON as shown in Figure 1 is realized
All optical communication between network unit is very important.As shown in Figure 1, solid line is connected as between the optical network unit in the PON of source mutually
Being in communication with each other between communication namely the optical network unit between PON-i and PON-i；Dotted line is connected as between the optical network unit of PON
Be in communication with each other namely the optical network unit between PON-i and PON-j between be in communication with each other.
In order to optimize all optical communication between the optical network unit of PON when remote node is in different location, it is necessary to
Consider following technological challenge：
1) it in order to realize the communication between optical network unit, cannot be disposed between the remote node and optical network unit any
Additional optical fiber；
2) in order to reduce the cost of optical network unit, it is impossible to dispose the data hair of additional optical network unit intercommunication
Penetrate machine；
3) optical line terminal can control being in communication with each other between optical network unit；
4) the remote node framework of each TDM-PON systems should remain unchanged；
5) while being in communication with each other between light net unit in same PON can be supported.
Invention content
According to it is above-mentioned to background technology and understanding, if it is possible to provide one kind in passive optical network
To be very useful for the device and method to communicate between optical network unit in the optical line terminal of network.
According to the first aspect of the invention, a kind of optical line terminal in the PON of communication network is provided, it is described logical
Communication network includes n PON, and the optical line terminal includes：1 × 2 photoswitch has input terminal and first, second output terminal,
For switching the optical signal of the communication of the data between the optical signal of upstream data and optical network unit, the optical line terminal is based on upper
The switching of 1x2 photoswitches described in the Type Control of row communication, the type of the uplink communication include upstream data communication and light net
Data communication between network unit；And n × n photoswitches, there is n input terminal and n output terminal, the optical line terminal is based on
The switching of n × n photoswitches described in the Type Control to communicate between optical network unit, the type to communicate between the optical network unit include
Optical network unit intercommunication in the optical network unit intercommunication of PON or source PON, wherein n represent the communication
The number of PON described in network, the source PON is provides the optical network unit to the input terminal of n × n photoswitches
Between data communication optical signal PON, the optical network unit intercommunication across PON be from the source PON to target
The communication of PON, the target PON are any one in addition to the source PON in the n PON in the communication network.
According to one embodiment of present invention, the input terminal of described 1 × 2 photoswitch comes from the ring of light for receiving
The uplink optical signal of device is returned, the ring of light returns device and comes from the uplink optical signal of wavelength division multiplexer for receiving, and by institute
It states uplink optical signal and is forwarded to 1 × 2 photoswitch, be also used for receiving the optical signal for coming from n × n photoswitches and be used for
The downlink optical signal of the data communication between the optical network unit is sent to the wavelength division multiplexer.
According to one embodiment of present invention, the optical line terminal based on come from the optical network unit it is described on
The request of data communication between row data communication or the optical network unit judges the type of the uplink communication for the uplink
When data communicate, the optical line terminal controls the 1x2 photoswitches to be switched to its first output terminal, the upstream data
Optical signals uplink signal receiver receive；The optical line terminal is based on the uplink for coming from the optical network unit
The request of data communication between data communication or the optical network unit judges the type of the uplink communication for the optical-fiber network
When data between unit communicate, the optical line terminal controls 1 × 2 photoswitch to be switched to its second output terminal, institute
State the input terminal that the optical signal that the data between optical network unit communicate is output to the photoswitch of the n × n.
According to one embodiment of present invention, the n input terminal of n × n photoswitches is respectively used to receive and come from
The optical signal of the second output terminal of 1 × 2 photoswitch of optical line terminal in corresponding source PON, the n
Output terminal is used to respectively send the optical signal that the data between the optical network unit for coming from corresponding source PON communicate
Optical line terminal into each corresponding source PON or target PON.
According to one embodiment of present invention, n × n photoswitches include：N 1 × n photoswitches, wherein each 1 × n
Photoswitch has 1 input terminal and n output terminal, and the input terminal comes from the institute in corresponding source PON for reception
State the optical signal of the second output terminal of 1 × 2 photoswitch of optical line terminal；It is each defeated in the n output terminal
Outlet corresponds respectively to any one in the n PON, for that will come from the end of the optical link in corresponding source PON
End 1 × 2 photoswitch second output terminal optical signal switching to the source PON or described targets PON optical combiner
Input terminal；And n optical combiner, wherein each optical combiner has n input terminal and 1 output terminal, the n input
Each input terminal in end is described for receiving the optical signal for the output terminal for coming from each 1 × n photoswitches respectively
Optical combiner merging comes from the optical signal of the output terminal of each 1 × n photoswitches and exports the optical signal of merging
To the optical line terminal of the source PON or described targets PON.
According to one embodiment of present invention, the type that the optical line terminal judges to communicate between the optical network unit is
During optical network unit intercommunication in the source PON, the optical line terminal controls n × n photoswitches to be switched to institute
State the i_i output terminals of n output terminal, the previous i in the i_i output terminals indicates the data communication between the optical network unit
Optical signal come from index the source PON for i, the latter i and indicate the light letter of the data communication between the optical network unit
Number it is switched to source PON of the index for i；The type that the ONT Optical Network Terminal judges to communicate between the optical network unit is institute
It states when the optical network unit intercommunication of PON, the optical line terminal controls n × n photoswitches to be switched to the n
The i_j output terminals of output terminal, i indicates that the optical signal of the data communication between the optical network unit comes from the i_j output terminals
In source PON of the index for i, j indicates that the optical signal of the data communication between the optical network unit is switched to index as j's
Target PON, wherein j are the arbitrary natural number for being less than or equal to n not equal to i, i and j.
According to one embodiment of present invention, downlink signal transmitter is further included, is used to carry to the wavelength division multiplexer
For the optical signal of in downstream wavelength, modulated downlink data.
According to one embodiment of present invention, the uplink signal receiver is further included, reception is used for and comes from described 1
The optical signal of the upstream data of first output terminal of × 2 photoswitches simultaneously detects the optical signal of the upstream data to obtain
Obtain the upstream data.
According to one embodiment of present invention, the wavelength division multiplexer is further included, is coupled to the downlink signal transmitting
Machine and the ring of light return device, for by the optical signal of the modulated downlink data with it is on different communication wavelength, modulated
The optical network unit between the optical signal of data communication be multiplexed with the downlink optical signal, be sent to through remote node described
Optical network unit；For receiving the uplink optical signal by the remote node for coming from the optical network unit,
In, the uplink optical signal includes the optical signal of the modulated upstream data merged in a time division manner and the optical-fiber network
The optical signal of data communication between unit.
According to the second aspect of the invention, it provides and is used in the optical line terminal of PON in a communication network a kind of
The method of optical network unit intercommunication, the communication network include n PON, including：Reception comes from the optical-fiber network
The request of data communication between the upstream data communication or optical network unit of unit and the optical signal of upstream data and optical-fiber network list
The optical signal of data communication between member；Led to according to the data between the upstream data communication or the optical network unit received
The request of letter judges the type of uplink communication and controls the switching of 1x2 photoswitches, according to the type of the uplink communication by described in
The optical signal switching of data communication between the optical signal of upstream data or the optical network unit is to the first of the 1x2 photoswitches
The second output terminal of output terminal or the 1x2 photoswitches；And judge the type to communicate between optical network unit and control n × n light
The switching of switch, the optical network unit that corresponding source PON will be come from according to the type to communicate between the optical network unit
Between the optical signal of data communication be respectively sent to optical line terminal in each corresponding source PON or target PON, it is described
The PON of optical signals of the source PON to provide the communication of the data between the optical network unit to the input terminal of n × n photoswitches, institute
Target PON is stated as any one in the n PON in the communication network in addition to the source PON.
According to one embodiment of present invention, the optical line terminal judges the type of the uplink communication for the uplink
When data communicate, the optical line terminal controls the 1x2 photoswitches to be switched to its first output terminal, the light of the upstream data
Signal is received by uplink signal receiver；The optical line terminal judges the type of the uplink communication for the optical network unit
Between data communication when, the optical line terminal controls the 1x2 photoswitches to be switched to its second output terminal, the optical-fiber network list
The optical signal of data communication between member is output to the input terminal of the photoswitch of the n × n.
According to one embodiment of present invention, the type that the optical line terminal judges to communicate between the optical network unit is
During the optical network unit intercommunication of the source PON, the optical line terminal controls n × n photoswitches to be switched to the n
I_i output terminals in a output terminal, the previous i in the i_i output terminals indicate the data communication between the optical network unit
Optical signal come from index the source PON for i, the latter i and indicate the light letter of the data communication between the optical network unit
Number it is switched to the source PON of the index for i；The type that the ONT Optical Network Terminal judges to communicate between the optical network unit is institute
It states when the optical network unit intercommunication of PON, the optical line terminal controls n × n photoswitches to be switched to the n
The i_j output terminals of output terminal, i indicates that the optical signal of the data communication between the optical network unit comes from the i_j output terminals
In the source PON of the index for i, j indicates that the optical signal of the data communication between the optical network unit is switched to index as j's
The target PON, wherein j are the arbitrary natural number for being less than or equal to n not equal to i, i and j.
According to the disclosure of the present invention, it is proposed that a kind of method and device in optical network unit intercommunication,
The present invention uniqueness the advantages of be：1) it realizes being in communication with each other between the optical network unit of PON, and supports simultaneously in the PON of source
Communication between optical network unit；2) it compares with conventional method, due to the use of light technology complete between optical network unit, provides extremely low
Delay and the bandwidth of higher capacity compared to more traditional method, while reduce the complicated light electro-optic conversion of optical line terminal
Processing, so as to improve the efficiency of network and energy conservation and environmental protection；3) additional transmitter is not needed between optical network unit, so as to drop significantly
The cost of low optical network unit and wavelength management complexity；4) it does not need to dispose between optical network unit and remote node additional
Optical fiber, and with optical distribution network (the Optical Distribution Network of current TDM-PON systems：ODN)
It is completely compatible；5) optical line terminal can control being in communication with each other between optical network unit, therefore have in actual implementation very big
Flexibility.
Description of the drawings
The following detailed description to non-limiting example, other spies of the invention are read by referring to accompanying drawing
Sign, objects and advantages will become more apparent upon.
Fig. 1 shows the schematic diagram of optical network unit intercommunication；
Fig. 2 shows the schematic diagrames of optical network unit framework；
Fig. 3 shows the schematic diagram across the optical line terminal framework of the full light optical network unit intercommunication of PON；
Fig. 4 shows the schematic diagram of n × n photoswitches；
Fig. 5 shows 2 × 2 photoswitch schematic diagram；And
Fig. 6 shows the flow chart of an optical network unit intercommunication.
In the figure through different diagrams, same or similar reference numeral represents the same or similar device (module)
Or step.
Specific embodiment
It, will be with reference to the appended attached drawing for forming a present invention part in the specific descriptions of following preferred embodiment.Institute
Attached attached drawing, which has been illustrated by way of example, can realize specific embodiment.Exemplary embodiment is not intended to
Limit all embodiments according to the present invention.It is appreciated that without departing from the scope of the present invention, other can be utilized
Embodiment can also carry out structural or logicality modification.Therefore, following specific descriptions and unrestricted, and this
The range of invention is defined by the claims appended hereto.It should be noted that although this hair is described with particular order in attached drawing
The step of bright middle method, but this do not require that or imply must according to the particular order come perform these operations or
It is that the operation having to carry out shown in whole could be realized desired as a result, on the contrary, step described herein can change holds
Row sequence.Additionally or alternatively, it is convenient to omit multiple steps are merged into step and performed and/or by one by certain steps
A step decomposes dimension execution of multiple steps.
Fig. 1 shows the schematic diagram of optical network unit intercommunication, and description is in the background technology as described in the figure
It provides, details are not described herein.
In order to preferably describe the solution of the present invention, make an elaboration to the framework of optical network unit 200 first.Figure
2 show the schematic diagram of optical network unit framework, including wavelength division multiplexer (Wave Division Multiplexing：WDM)
203, the ring of light returns device 202, the data receiver 205 between optical network unit, between downlink receiver 201 and upstream data and OUN
Data transmitter 204.The optical network unit 200 can be with the data between simultaneous transmission upstream data and optical network unit.
Wavelength division multiplexer 203 is coupled to downlink receiver 201 and the ring of light and returns device 202, is for by certain downstream wavelength
Optical signal is detached with the optical signal of the second communication wavelengths.
It is for receiving the light letter for coming from the data transmitter between upstream data and optical network unit that the ring of light, which returns device 202,
Number, and send it to wavelength division multiplexer 203；Lead to for receiving the data between the optical network unit from wavelength division multiplexer 203
The optical signal of letter is simultaneously looped back to the data receiver between optical network unit.
Data receiver 204 between optical network unit is to come from the ring of light for reception to return between the optical network unit of device 202
Data communication optical signal and receive the data between optical network unit therein.
Downlink receiver 201 is for receiving the downlink light with certain downstream wavelength for coming from wavelength division multiplexer 203
Downlink data in signal.Wherein, the downstream wavelength is different from the second communication wavelengths.
Data transmitter 205 between upstream data and optical network unit is for merging upper line number in a time multiplexed manner
According to the data between optical network unit, the electric signal of the data after merging is converted into optical signal, and by upstream data and light net
Data between network unit, which are modulated in same upstream wavelength and are sent to the ring of light, returns device 202.
As shown in Figure 2, the data between upstream data and optical network unit are modulated on same in a time multiplexed manner
On the transmitter of traveling wave length.The data return device by the ring of light and are input to wavelength division multiplexer.Data wherein between optical network unit
The data receiver being looped back to through optical line terminal between the optical network unit of source PON or target PON, upstream data are answered through wavelength-division
The receiver being sent to device 203 in optical line terminal.
For example, in an optical network unit 200, in time slot Ti, transmit upstream data；In time slot Ti+ t transmits optical-fiber network
Data between unit.From figure 2 it can be seen that because of the same transmitter of data between upstream data and optical network unit,
So the cost of optical network unit can be effectively reduced.In addition, Dynamic Bandwidth Allocation agreement can also coordinate upstream data and
Data communication between optical network unit.
Due to the same wavelength of data sharing between upstream data and optical network unit, inevitably, line number on part
According to bandwidth can be occupied by the data between optical network unit.In order to improve the performance of upstream data communication, upstream data coating is first
It is buffered in optical network unit buffer area, once there is the bandwidth of redundancy, Dynamic Bandwidth Allocation agreement is by the upstream data band of compensation
Wide loss that is, when the bandwidth requirement of data transmission between optical network unit is relatively low, distributes more time slots to this light
The transmitting uplink data of network element.
In order to overcome the problems, such as such as traditional solution described in background technology, the present invention proposes as shown in Figure 3
Solution.Fig. 3 shows the signal across the optical line terminal framework of the optical network unit intercommunication of the full light of PON
Figure.Optical line terminal 300 in the figure includes downlink signal transmitter 305, wavelength division multiplexer 303, uplink signal receiver
302, the ring of light returns 301,1 × 2 photoswitch 304 of device and n × n photoswitches 306.
Downlink signal transmitter 305 is in certain downstream wavelength, modulated for being provided to wavelength division multiplexer 303
The optical signal of downlink data.
Wavelength division multiplexer 303 is coupled to downlink signal transmitter 305 and the ring of light and returns device 301, and for will be modulated
The optical signal multiplexing that data between the optical signal of downlink data and optical network unit on different communication wavelength, modulated communicate
For downlink optical signal, the optical network unit is sent to through remote node 307；It is also used for receiving the warp for coming from optical network unit
Cross the uplink optical signal of remote node 307.Wherein, uplink optical signal includes the modulated upstream data merged in a time division manner
Optical signal and optical network unit between data communication optical signal.
Uplink signal receiver 302 is the upstream data for receiving the first output terminal for coming from 1 × 2 photoswitch 304
Optical signal and detect the optical signal of upstream data to obtain the upstream data.
It is the uplink optical signal for coming from wavelength division multiplexer 303 for reception that the ring of light, which returns device 301, and uplink optical signal is turned
1 × 2 photoswitch 304 is sent to, be also used for receiving the optical signal for coming from n × n photoswitches 306 and is used for wavelength division multiplexer
303 send the downlink optical signal of the data communication between optical network unit.
There are one input terminal and first, second output terminals for 1 × 2 photoswitch 304 tool, are used to switch the light letter of upstream data
The optical signal of data communication number between optical network unit, Type Control 1x2 light of the optical line terminal 300 based on uplink communication are opened
304 switching is closed, the type of uplink communication includes the data communication between upstream data communication and optical network unit.When optical link end
Request of the end 300 based on the data communication between the upstream data communication or the optical network unit for coming from optical network unit judges
When the type of uplink communication is upstream data communication, optical line terminal 300 controls 1x2 photoswitches 304 to be switched to the first output terminal,
The optical signals uplink signal receiver 302 of upstream data receives；Optical line terminal 300 is based on coming from the upper of optical network unit
The request of data communication between row data communication or optical network unit judges number of the type of uplink communication between optical network unit
During according to communication, optical line terminal 300 controls 1 × 2 photoswitch 304 to be switched to second output terminal, data between optical network unit
Optical signal be output to the n × n photoswitch 306 input terminal.The input terminal of 1 × 2 photoswitch 304 comes for receiving
From the uplink optical signal that device 301 is returned in the ring of light.
N × n photoswitches 306 are the optical network unit intercommunications being used to implement across PON, while are also supported in the PON of source
Optical network unit between be in communication with each other.N × n photoswitches 306 have n input terminal and n output terminal.Optical line terminal 300
Based on the switching of Type Control n × n photoswitches 306 to communicate between optical network unit, the type to communicate between optical network unit includes
Optical network unit intercommunication in the optical network unit intercommunication of PON or source PON, wherein n represent communication network
The number of middle PON, optical signals of the source PON to provide the communication of the data between optical network unit to the input terminal of n × n photoswitches
PON, be from source PON to the communication of target PON across the optical network unit intercommunication of PON, target PON is in communication network
N PON in any one in addition to the PON of source.
N input terminal of n × n photoswitches 306, which is respectively used to receive, comes from optical line terminal in corresponding source PON
The optical signal of the second output terminal of 1 × 2 photoswitch 304, the n output terminal are used for the light that will come from corresponding source PON
The optical signal of data communication between network element is respectively sent to the optical line terminal in each corresponding source PON or target PON
In the ring of light return device 301.N × n photoswitches 306 can be located in n PON in the optical line terminal of any one PON, for inciting somebody to action
The data of mono- optical network unit of source PON are switched to another optical network unit of source PON or by the optical network units of source PON
Data are switched to the optical network unit of target PON.Although each remote node 307 shown in Fig. 3 is in different positions
It puts, the remote node 307 can also be in same position.
Fig. 4 shows the schematic diagram of n × n photoswitches 306.As shown in figure 4, n × n photoswitches 306 are by n 1 × n photoswitches
It is formed with n optical combiner.Each 1 × n photoswitches in n 1 × n photoswitches have 1 input terminal and n output terminal,
Input terminal is believed for receiving the light of the second output terminal for 1 × 2 photoswitch for coming from the optical line terminal in corresponding source PON
Number；Each output terminal in its n output terminal corresponds respectively to any one in n PON, for that will come from corresponding source
The optical signal switching of the second output terminal of 1 × 2 photoswitch of the optical line terminal in PON is to the photosynthetic road of source PON or target PON
The input terminal of device.
Each optical combiner in n optical combiner has n input terminal and 1 output terminal, every in n input terminal
A input terminal comes from the optical signal of the output terminal of each 1 × n photoswitches in n × n photoswitches 306, light for reception respectively
Combiner merging comes from the optical signal of the output terminal of each 1 × n photoswitches and the optical signal of merging is output to source PON or mesh
The ring of light marked in the optical line terminal in PON returns device.Each target PON corresponds to an optical combiner.
Optical line terminal can control the photoswitch of 1 × n corresponding with the optical line terminal in each PON.Logical
In the case of often, n × n photoswitches 306 are switched to the state of the communication between the optical network unit in the PON of execution source.When coming from
During communication request between the optical network unit of other PON in addition to the PON of source, the light of 1 × n in the photoswitch of corresponding n × n
Switch is switched to the state performed across the optical network unit intercommunication of PON.In this case, across the light net of PON
Data between network unit can be routed to the optical network unit of corresponding target PON.
In order to better illustrate the communication mechanism between optical network unit, it can be assumed that one between two different PON
Communication scenes between optical network unit, in this scene, as described above, in order to realize across optical network unit in PON or source PON
Intercommunication, as shown in figure 5,2 × 2 photoswitches are made of 1 × 2 photoswitch of two and two optical combiners.Each PON
A corresponding optical combiner.The input port of the optical combiner of PON-1 is 1-1 ports and 2-1 ports.For example, the 1-1 ports
The data of optical network unit for representing to come from PON-1 are routed back to PON-1, and the 2-1 ports represent to come from PON-2's
The data of optical network unit are routed to PON-1.Optical combiner corresponding to PON-1 is by the optical signal of 1-1 ports and 2-1 ports
PON-1 is output to after merging.It can independently be controlled and PON-1 or PON-2 institutes positioned at the optical line terminal of PON-1 or PON-2
Corresponding 1 × 2 photoswitch.
Fig. 6 shows the flow chart to communicate between an optical network unit.When an optical network unit to establish and another
During the communication of optical network unit, in the time slot T distributedi+ t, the data between optical network unit are modulated to the wavelength of uplink simultaneously
It is transferred to the optical line terminal of the PON belonging to optical network unit.
In the step s 100, optical line terminal reception comes from the upstream data communication or optical network unit of optical network unit
Between data communication request and upstream data optical signal and optical network unit between data communication optical signal.
In step s 200, optical line terminal is according between the upstream data communication or the optical network unit received
Data communication request, judge the type of uplink communication and control the switching of 1x2 photoswitches, according to the class of the uplink communication
The optical signal switching that type communicates the data between the optical signal of upstream data or the optical network unit is to the first of 1x2 photoswitches
The second output terminal of output terminal or 1x2 photoswitches.
Type if up communication is upstream data, and optical line terminal controls 1x2 photoswitches to believe the light of upstream data
The first output terminal number is switched to, the optical signals receiver of upstream data receives.
Type if up communication is the data communication between optical network unit, and optical line terminal control 1x2 photoswitches will
The optical signal switching of data communication between optical network unit is to second output terminal, optical signal that the data between optical network unit communicate
It is output to the input terminal of the photoswitch of n × n.
In step S300, optical line terminal judges the type to communicate between optical network unit and controls cutting for n × n photoswitches
It changes, according to the type to communicate between optical network unit by the optical signal of the data between the optical network unit for coming from corresponding source PON
The optical line terminal being respectively sent in each corresponding source PON or target PON.
The phase between the type that optical line terminal judges to communicate between the optical network unit is the optical network unit of the source PON
During mutual communication, optical line terminal control n × n photoswitches are switched to the i_i output terminals in n output terminal, wherein in i_i output terminals
Previous i indicate that the optical signal of the data communication between the optical network unit comes from source PON of the index for i, the latter i refers to
Show that the optical signal of the communication of the data between optical network unit is switched to the source PON of the index for i.As shown in Fig. 5 (a), PON-1
1 × 2 photoswitch of the source PON-1 corresponded in 2 × 2 photoswitch is switched to 1-1 ports by optical line terminal.The 1-1
The output signal of port returns device through the ring of light in the PON-1 of source and is routed back to source PON-1.
The type to communicate between ONT Optical Network Terminal judges optical network unit is the optical network unit intercommunication across PON
When, optical line terminal control n × n photoswitches are switched to the i_j output terminals in n output terminal, and i indicates light net in i_j output terminals
The optical signal of data communication between network unit comes from the data communication between the index source PON for i, j instruction optical network unit
It is the arbitrary natural number for being less than or equal to n that optical signal, which is switched to index the target PON for j, wherein j not equal to i, i and j,.Such as Fig. 5
(b) shown in, 1 × 2 photoswitch of the source PON-1 corresponded in 2 × 2 photoswitch is switched to by source PON-1 optical line terminals
1-2 ports.The output signal of the 1-2 ports returns device through the ring of light in target PON-2 and is routed to target PON-2, realizes
Across the optical network unit intercommunication of PON.
It should be appreciated by those skilled in the art the optical line terminal in other PON can also control n in the same way
× n photoswitches are switched to other ports.
It is obvious to a person skilled in the art that the present invention is not limited to the details of above-mentioned exemplary embodiment, Er Qie
In the case of without departing substantially from spirit or essential attributes of the invention, the present invention can be realized in other specific forms.Therefore, no matter
How from the point of view of, the present embodiments are to be considered as illustrative and not restrictive.In addition, it will be evident that one word of " comprising " not
Exclude other elements and step, and wording "one" be not excluded for plural number.The multiple element stated in device claim also may be used
To be realized by an element.The first, the second grade words are used to indicate names, and are not represented any particular order.
Claims (12)
1. a kind of optical line terminal in the passive optical network PON of communication network, the communication network includes n PON, described
Optical line terminal includes：
1 × 2 photoswitch has input terminal and first, second output terminal, is used to switch the optical signal and optical-fiber network of upstream data
The optical signal of data communication between unit, the optical line terminal is based on 1x2 photoswitches described in the Type Control of uplink communication
Switching, the type of the uplink communication include the data communication between upstream data communication and optical network unit；And
N × n photoswitches, have n input terminal and a n output terminal, and the optical line terminal between optical network unit based on communicating
The switching of n × n photoswitches described in Type Control, the type to communicate between the optical network unit include the optical network unit across PON
Optical network unit intercommunication in intercommunication or source PON, wherein n represent of PON described in the communication network
Number, light of the source PON to provide the communication of the data between the optical network unit to the input terminal of n × n photoswitches
The PON of signal, the optical network unit intercommunication across PON are communication from the source PON to target PON, the mesh
PON is marked as any one in the n PON in the communication network in addition to the source PON.
2. optical line terminal as described in claim 1, which is characterized in that the input terminal of described 1 × 2 photoswitch is used for
It receives and comes from the uplink optical signal that the ring of light returns device, the ring of light returns device for receiving the uplink for coming from wavelength division multiplexer
Optical signal, and the uplink optical signal is forwarded to 1 × 2 photoswitch, it is also used for reception and comes from n × n photoswitches
Optical signal and downlink optical signal for sending from the data communication between the optical network unit to the wavelength division multiplexer.
3. optical line terminal as described in claim 1, which is characterized in that the optical line terminal is based on coming from the light net
The request of data communication between the upstream data communication of network unit or the optical network unit judges the uplink communication
When type is the upstream data communication, the optical line terminal controls the 1x2 photoswitches to be switched to its first output
End, the optical signals uplink signal receiver of the upstream data receive；The optical line terminal is based on coming from the light net
The request of data communication between the upstream data communication of network unit or the optical network unit judges the uplink communication
When data of the type between the optical network unit communicate, the optical line terminal controls 1 × 2 photoswitch to be switched to its institute
State second output terminal, the optical signal of the data communication between the optical network unit is output to the input of the photoswitch of the n × n
End.
4. optical line terminal as described in claim 1, which is characterized in that the n input terminal of n × n photoswitches point
The light of the second output terminal for 1 × 2 photoswitch for coming from the optical line terminal in corresponding source PON Yong Yu not received
Signal, the n output terminal are used to come from the data communication between the optical network unit of corresponding source PON
Optical signal is respectively sent to the optical line terminal in each corresponding source PON or target PON.
5. optical line terminal as described in claim 1, which is characterized in that n × n photoswitches include：
N 1 × n photoswitches, wherein each 1 × n photoswitches have 1 input terminal and n output terminal, the input terminal is used to connect
Receive the light letter of the second output terminal for 1 × 2 photoswitch for coming from the optical line terminal in corresponding source PON
Number；Each output terminal in the n output terminal corresponds respectively to any one in the n PON, for that will come from institute
The optical signal switching of the second output terminal of 1 × 2 photoswitch of the optical line terminal in corresponding source PON is stated to the source
The input terminal of the optical combiner of PON or described targets PON；And
N optical combiner, wherein each optical combiner has n input terminal and 1 output terminal, it is every in the n input terminal
A input terminal comes from the optical signal of the output terminal of each 1 × n photoswitches, the optical combiner for reception respectively
Merge the optical signal for the output terminal for coming from each 1 × n photoswitches and the optical signal of merging is output to the source
The optical line terminal of PON or described targets PON.
6. optical line terminal as described in claim 1, which is characterized in that the optical line terminal judges the optical network unit
Between the type that communicates when being the optical network unit intercommunication in the source PON, the optical line terminal controls the n × n
Photoswitch is switched to the i_i output terminals in the n output terminal, and the previous i in the i_i output terminals indicates the optical-fiber network
The optical signal of data communication between unit comes from the source PON that index is i, and the latter i is indicated between the optical network unit
Data communication optical signal be switched to it is described index for i source PON；The ONT Optical Network Terminal judges the optical network unit
Between the type that communicates be described when the optical network unit intercommunication of PON, the optical line terminal controls n × n light
To the i_j output terminals in the n output terminal, the i in the i_j output terminals is indicated between the optical network unit switching
The optical signal of data communication comes from the index source PON for i, j and indicates the light of the data communication between the optical network unit
It is the arbitrary natural number for being less than or equal to n that signal, which is switched to index the target PON for j, wherein j not equal to i, i and j,.
7. optical line terminal as claimed in claim 2, which is characterized in that further include downlink signal transmitter, be used for institute
State the optical signal that wavelength division multiplexer provides in downstream wavelength, modulated downlink data.
8. optical line terminal as claimed in claim 3, which is characterized in that further include the uplink signal receiver, be used for
Reception comes from the optical signal of the upstream data of first output terminal of 1 × 2 photoswitch and detects the uplink
The optical signal of data is to obtain the upstream data.
9. optical line terminal as claimed in claim 7, which is characterized in that further include the wavelength division multiplexer, be coupled to institute
It states downlink signal transmitter and the ring of light and returns device, for by the optical signal of the modulated downlink data and different communication wave
The optical signal of data communication between in length, the modulated optical network unit is multiplexed with the downlink optical signal, through long-range
Node is sent to the optical network unit；For receive come from the optical network unit by described in the remote node
Uplink optical signal, wherein, the light that the uplink optical signal includes the modulated upstream data merged in a time division manner is believed
The optical signal of data communication number between the optical network unit.
10. optical network unit intercommunication to be used in a kind of optical line terminal of passive optical network PON in a communication network
Method, the communication network include n PON, including：
Receive come from the optical network unit upstream data communication or optical network unit between data communication request and on
The optical signal of data communication between the optical signal and optical network unit of row data；
According to the request that the data between the upstream data communication or the optical network unit received communicate, judge that uplink is led to
The type of letter and the switching for controlling 1x2 photoswitches, according to the type of the uplink communication by the optical signal of the upstream data or
First output terminal or the 1x2 light of the optical signal switching of data communication between the optical network unit to the 1x2 photoswitches
The second output terminal of switch；And
Judge the type to communicate between optical network unit and control the switching of n × n photoswitches, communicate according between the optical network unit
Type by between the optical network unit for coming from corresponding source PON data communicate optical signal be respectively sent to each institute
The optical line terminal in corresponding source PON or target PON is stated, the source PON is provides to the input terminal of n × n photoswitches
The PON of the optical signal of data communication between the optical network unit, the target PON are n in the communication network described
Any one in PON in addition to the source PON.
11. method as claimed in claim 10, which is characterized in that the optical line terminal judges the type of the uplink communication
During for the upstream data communication, the optical line terminal controls the 1x2 photoswitches to be switched to its first output terminal, it is described on
The optical signals uplink signal receiver of row data receives；The optical line terminal judges that the type of the uplink communication is described
When data between optical network unit communicate, the optical line terminal controls the 1x2 photoswitches to be switched to its second output terminal, institute
State the input terminal that the optical signal that the data between optical network unit communicate is output to the photoswitch of the n × n.
12. method as claimed in claim 10, which is characterized in that the optical line terminal judges to lead between the optical network unit
When the type of letter is the optical network unit intercommunication of the source PON, the optical line terminal controls n × n photoswitches
The i_i output terminals being switched in the n output terminal, the previous i in the i_i output terminals are indicated between the optical network unit
The optical signal of data communication come from index the source PON for i, the latter i and indicate the data between the optical network unit
The optical signal of communication is switched to the source PON of the index for i；The ONT Optical Network Terminal judges to communicate between the optical network unit
Type be when the optical network unit intercommunication of PON, the optical line terminal controls n × n photoswitches to be switched to
I_j output terminals in the n output terminal, i indicates the light of the data communication between the optical network unit in the i_j output terminals
Signal comes from index the source PON for i, j and indicates that the optical signal of the data communication between the optical network unit is switched to
The target PON for j is indexed, wherein j is the arbitrary natural number for being less than or equal to n not equal to i, i and j.
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| CN113973239A (en) * | 2020-07-24 | 2022-01-25 | 上海诺基亚贝尔股份有限公司 | Method, apparatus, optical network unit, optical line terminal and medium for communication |
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| CN102104424A (en) * | 2011-03-04 | 2011-06-22 | 中兴通讯股份有限公司 | Protection method and system for PON (Passive Optical Network) |
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| CN101087174A (en) * | 2006-06-08 | 2007-12-12 | 华为技术有限公司 | Passive optical network system and method of optical routing device and application optical routing device |
| CN102104424A (en) * | 2011-03-04 | 2011-06-22 | 中兴通讯股份有限公司 | Protection method and system for PON (Passive Optical Network) |
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