CN104768086A - Method and device for mutual communication between optical network units - Google Patents
Method and device for mutual communication between optical network units Download PDFInfo
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Abstract
The invention discloses a device and a method for mutual communication between optical network units in an optical line terminal in a PON (Passive Optical Network) of a communication network. The device comprises a 1*2 optical switch and an n*n optical switch. The 1*2 optical switch is provided with an input end, a first output end and a second output end for switching optical signals of uplink data and optical signals of data communication between the optical network units. The n*n optical switch is provided with n*n input ends and n*n output ends, the n*n input ends are used for receiving optical signals of the second output end of the 1*2 optical switch of an optical line terminal from each source PON respectively,and the n*n output ends are used for respectively sending the combined optical signals to an optical loopback device located on the optical line terminal in each source PON or target PON for mainly switching data of the optical network units in the source PON to optical network units in the target PON. In the condition of not increasing external fibers and transmitters of the optical network units, mutual communication between the optical network units crossing the PON can be flexibly realized.
Description
Technical field
The present invention relates to the EPON in communication network, more specifically, relate to method and the device of the optical network unit intercommunication in EPON.
Background technology
Cooperative multipoint transmission (Co-ordinate MultiPoint:CoMP) technology has carried out discussing widely as an important application of LTE in LTE.Because it allows different eNB cooperative control interference and/or participate in combining to send and receive, cooperative multipoint transmission technology effectively can improve the throughput of LTE-A user.But cooperative multipoint transmission technology needs the interchange being carried out user data and/or cell information by mobile retransmission network, so the performance boost of cooperative multipoint transmission depends on the ability of mobile retransmission network to a great extent.In described cooperative multipoint transmission technology, intercell information and/or exchanges data are carried out between adjacent base station.And the logic interfacing between two base stations, the X2 interface namely in 3GPP, mutual for this intercell information and/or data.
According to some current research reports, cooperative multipoint transmission technology General Requirements is no more than the delay of several milliseconds and data capacity can reach several Gbps.Therefore, low delay and high bandwidth become the bottleneck realizing cooperative multipoint transmission technology, because it can not meet cooperative multipoint transmission technology completely to data and/or information interchange requirement.In addition, between Future cellular networks, switching frequently also needs larger, the inter-base station interface throughput of information interchange faster and Geng Gao.
The superiority bandwidth huge in view of it and disposing widely, EPON (PassiveOptical Network:PON) access technology is regarded as the most promising solution always provides cost effective mobile retransmission to ensure cooperative multipoint transmission technology.Especially, full light interworking technology between optical network unit (Optical Network Unit:ONU) can realize the direct communication between optical network unit, and without the need to photoelectricity light (Optical-Electrical-Optical:OEO) conversion of complexity and other Electric signal processings, this is the very attractive solution of a delay supporting to be less than in cooperative multipoint transmission technology 1ms and the rate bandwidth being greater than 1Gb/s.
About full light optical network unit between communication, current achievement in research mainly concentrates on the optical network unit intercommunication in the PON of source.But in practice, the optical network unit intercomed mutually belongs to different PON usually, and the remote node in these PON may in different positions.In this case, all optical communication realized between the optical network unit between different PON is as shown in Figure 1 very important.As shown in Figure 1, solid line connects for the optical network unit intercommunication in the PON of source, the intercommunication mutually between the optical network unit also namely between PON-i and PON-i; Dotted line connects for the optical network unit intercommunication across PON, the intercommunication mutually between the optical network unit also namely between PON-i and PON-j.
In order to optimize when remote node is in diverse location across PON optical network unit between all optical communication, following technological challenge must be considered:
1) in order to realize the communication between optical network unit, any extra optical fiber can not be disposed between described remote node and optical network unit;
2) in order to reduce the cost of optical network unit, the data transmitter of extra optical network unit intercommunication can not be disposed;
3) optical line terminal can control the intercommunication mutually between optical network unit;
4) the remote node framework of each TDM-PON system should remain unchanged;
5) intercommunication mutually between the light net unit in same PON can be supported simultaneously.
Summary of the invention
According to the understanding of the above-mentioned technical problem to background technology and existence, if can provide a kind of in the optical line terminal of EPON for optical network unit between the device and method that communicates, will be highly profitable.
According to a first aspect of the invention, provide a kind of optical line terminal in the PON of communication network, described communication network comprises n PON, described optical line terminal comprises: 1 × 2 optical switch, there is input and first, second output, it is for switching the light signal of the data communication between the light signal of upstream data and optical network unit, described optical line terminal based on uplink communication Type Control described in the switching of 1x2 optical switch, the type of described uplink communication comprises the data communication between upstream data communication and optical network unit, and n × n optical switch, there is n input and n output, described optical line terminal is based on the switching of n × n optical switch described in the Type Control communicated between optical network unit, the type communicated between described optical network unit comprises across the optical network unit intercommunication in the optical network unit intercommunication of PON or source PON, wherein n represents the number of PON described in described communication network, described source PON is the PON providing the light signal of the data communication between described optical network unit to the described input of described n × n optical switch, the described optical network unit intercommunication across PON is the communication from described source PON to target P ON, described target P ON is any one in n described PON in described communication network except described source PON.
According to one embodiment of present invention, the described input of the optical switch of described 1 × 2 comes from for receiving the uplink optical signal that the ring of light returns device, the described ring of light returns device for receiving the described uplink optical signal coming from wavelength division multiplexer, and described uplink optical signal is forwarded to described 1 × 2 optical switch, also come from the light signal of described n × n optical switch and the downlink optical signal for sending the data communication between described optical network unit to described wavelength division multiplexer for receiving.
According to one embodiment of present invention, when described optical line terminal judges that the type of described uplink communication is described upstream data communication based on the request of the data communication come between the described upstream data communication of described optical network unit or described optical network unit, described optical line terminal controls described 1x2 optical switch and is switched to the first output described in it, and the optical signals upward signal receiver of described upstream data receives; When described optical line terminal judges that the type of described uplink communication is the data communication between described optical network unit based on the request of the data communication come between the described upstream data communication of described optical network unit or described optical network unit, described optical line terminal controls described 1 × 2 optical switch and is switched to the second output described in it, and the light signal of the data communication between described optical network unit is output to the input of the optical switch of described n × n.
According to one embodiment of present invention, described n input of described n × n optical switch is respectively used to receive the light signal of described second output of described 1 × 2 optical switch of the optical line terminal come from corresponding source PON, and the light signal of the data communication between the output of n described in it is used for the described optical network unit coming from corresponding source PON is sent to the optical line terminal in each corresponding source PON or target P ON respectively.
According to one embodiment of present invention, described n × n optical switch comprises: n 1 × n optical switch, wherein each 1 × n optical switch has 1 input and n output, and described input is for receiving the light signal of described second output of described 1 × 2 optical switch of the described optical line terminal come from corresponding source PON; Each output in a described n output corresponds respectively to any one in a described n PON, and the light signal for the second output of described 1 × 2 optical switch by the optical line terminal come from corresponding source PON is switched to the input of the optical combiner of described source PON or described target P ON; And n optical combiner, wherein each optical combiner has n input and 1 output, each input in a described n input is used for receiving the light signal coming from the described output of each described 1 × n optical switch respectively, and described optical combiner merges the light signal the described optical line terminal light signal of merging being outputted to described source PON or described target P ON that come from the described output of each described 1 × n optical switch.
According to one embodiment of present invention, when described optical line terminal judges that the type communicated between described optical network unit is the optical network unit intercommunication in described source PON, described optical line terminal controls the i_i output that described n × n optical switch is switched to a described n output, previous i in described i_i output indicate the light signal of the data communication between described optical network unit to come from described source PON that index is i, a rear i indicate the light signal of the data communication between described optical network unit to be switched to source PON that described index is i; When described Optical Network Terminal judges that the type communicated between described optical network unit is the described optical network unit intercommunication across PON, described optical line terminal controls the i_j output that described n × n optical switch is switched to a described n output, i indicate the light signal of the data communication between described optical network unit to come from source PON that described index is i in described i_j output, j indicate the light signal of the data communication between described optical network unit to be switched to target P ON that index is j, wherein j is not equal to i, i and j is the natural number being less than or equal to arbitrarily n.
According to one embodiment of present invention, also comprise downstream signal transmitter, it is for providing the light signal of in downstream wavelength, modulated downlink data to described wavelength division multiplexer.
According to one embodiment of present invention, also comprise described upward signal receiver, its for receive come from the described upstream data of described first output of described 1 × 2 optical switch light signal the light signal detecting described upstream data to obtain described upstream data.
According to one embodiment of present invention, also comprise described wavelength division multiplexer, it is coupled to described downstream signal transmitter and the described ring of light returns device, for by the light signal of described modulated downlink data and different communication wavelength, the light signal of data communication between modulated described optical network unit is multiplexed with described downlink optical signal, sends to described optical network unit through remote node; For receiving the described uplink optical signal through described remote node coming from described optical network unit, wherein, described uplink optical signal comprises the light signal of the data communication between the light signal of the modulated described upstream data merged in a time division manner and described optical network unit.
According to a second aspect of the invention, provide the method for optical network unit intercommunication in the optical line terminal of a kind of PON in a communication network, described communication network comprises n PON, and it comprises: receive the light signal coming from the request of data communication between the upstream data communication of described optical network unit or optical network unit and the data communication between the light signal of upstream data and optical network unit; According to the request of the data communication between the described upstream data communication received or described optical network unit, judge the type of uplink communication and the switching of control 1x2 optical switch, the light signal of the data communication between the light signal of described upstream data or described optical network unit is switched to the first output of described 1x2 optical switch or the second output of described 1x2 optical switch by the type according to described uplink communication; And the type communicated between judgement optical network unit the switching of control n × n optical switch, according to the type communicated between described optical network unit the light signal of the data communication between the described optical network unit coming from corresponding source PON is sent to respectively the optical line terminal in each corresponding source PON or target P ON, any one in described source PON n the described PON that to be the PON providing the light signal of the data communication between described optical network unit to the input of described n × n optical switch, described target P ON be in described communication network except described source PON.
According to one embodiment of present invention, when described optical line terminal judges that the type of described uplink communication is described upstream data communication, described optical line terminal controls described 1x2 optical switch and is switched to its first output, and the optical signals upward signal receiver of described upstream data receives; When described optical line terminal judges that the type of described uplink communication is the data communication between described optical network unit, described optical line terminal controls described 1x2 optical switch and is switched to its second output, and the light signal of the data communication between described optical network unit is output to the input of the optical switch of described n × n.
According to one embodiment of present invention, when described optical line terminal judges that the type communicated between described optical network unit is the optical network unit intercommunication of described source PON, described optical line terminal controls described n × n optical switch and is switched to i_i output in a described n output, previous i in described i_i output indicate the light signal of the data communication between described optical network unit to come from described source PON that index is i, a rear i indicate the light signal of the data communication between described optical network unit to be switched to described source PON that index is i; When described Optical Network Terminal judges that the type communicated between described optical network unit is the described optical network unit intercommunication across PON, described optical line terminal controls the i_j output that described n × n optical switch is switched to a described n output, i indicate the light signal of the data communication between described optical network unit to come from described source PON that index is i in described i_j output, j indicate the light signal of the data communication between described optical network unit to be switched to described target P ON that index is j, wherein j is not equal to i, i and j is the natural number being less than or equal to arbitrarily n.
Content disclosed according to the present invention, propose a kind of method at optical network unit intercommunication and device, the advantage of uniqueness of the present invention is: the intercommunication mutually between 1) realizing across the optical network unit of PON, and supports the communication between the optical network unit in the PON of source simultaneously; 2) compare with conventional method, due to the use of light technology complete between optical network unit, provide the bandwidth of extremely low delay and more high power capacity, traditional method of comparing, decrease the photoelectricity light conversion process of the complexity of optical line terminal simultaneously, thus improve efficiency and the energy-conserving and environment-protective of network; 3) do not need extra transmitter between optical network unit, thus greatly reduce cost and the wavelength management complexity of optical network unit; 4) do not need to dispose extra optical fiber between optical network unit and remote node, and completely compatible with the optical distribution network (Optical DistributionNetwork:ODN) of current TDM-PON system; 5) optical line terminal can control the intercommunication mutually between optical network unit, therefore in reality is implemented, has very large flexibility.
Accompanying drawing explanation
Read the following detailed description to non-limiting example by referring to accompanying drawing, other features, objects and advantages of the present invention will become more obvious.
Fig. 1 shows the schematic diagram of optical network unit intercommunication;
Fig. 2 shows the schematic diagram of optical network unit framework;
Fig. 3 shows the schematic diagram of the optical line terminal framework of the full light optical network unit intercommunication across PON;
Fig. 4 shows the schematic diagram of n × n optical switch;
Fig. 5 shows the optical switch schematic diagram of 2 × 2; And
Fig. 6 shows the flow chart of an optical network unit intercommunication.
In the drawings, run through different diagrams, same or similar Reference numeral represents same or analogous device (module) or step.
Embodiment
In the specific descriptions of following preferred embodiment, with reference to the accompanying drawing formed appended by a part of the present invention.Appended accompanying drawing shows by way of example and can realize specific embodiment of the present invention.The embodiment of example is not intended to limit according to all embodiments of the present invention.Be appreciated that under the prerequisite not departing from scope of the present invention, other embodiments can be utilized, also can carry out amendment that is structural or logicality.Therefore, following specific descriptions are also nonrestrictive, and scope of the present invention limited by appended claim.It should be noted that, although describe the step of method in the present invention in accompanying drawing with particular order, but this not requires or hint must perform these operations according to this particular order, or the operation shown in must performing all could realize the result of expectation, on the contrary, step described herein can change execution sequence.Additionally or alternatively, some step can be omitted, multiple step be merged into a step and perform, and/or a step be decomposed the multiple step of dimension and perform.
Fig. 1 shows the schematic diagram of optical network unit intercommunication, and the description about this figure provides in the introduction, does not repeat them here.
In order to better describe solution of the present invention, first an elaboration is done to the framework of optical network unit 200.Fig. 2 illustrates the schematic diagram of optical network unit framework, it comprises wavelength division multiplexer (Wave Division Multiplexing:WDM) 203, the ring of light returns device 202, the data receiver 205 between optical network unit, the data transmitter 204 between downlink receiver 201 and upstream data and OUN.Described optical network unit 200 can data simultaneously between transmit ascending data and optical network unit.
Wavelength division multiplexer 203 is coupled to downlink receiver 201 and returns device 202 with the ring of light, is for being separated by the light signal of the light signal of certain downstream wavelength with second communication wavelength.
It is light signals for receiving the data transmitter come between upstream data and optical network unit that the ring of light returns device 202, and sends it to wavelength division multiplexer 203; For the data communication between receiving from the optical network unit of wavelength division multiplexer 203 light signal and by the data receiver between its loopback to optical network unit.
Data receiver 204 between optical network unit is light signal for receiving the data communication come between optical network unit that the ring of light returns device 202 and the data received between optical network unit wherein.
Downlink receiver 201 is for receiving the downlink data had in the downlink optical signal of certain downstream wavelength coming from wavelength division multiplexer 203.Wherein, described downstream wavelength is different from second communication wavelength.
Data transmitter 205 between upstream data and optical network unit is the data for merging in a time multiplexed manner between upstream data and optical network unit, convert the signal of telecommunication of data after merging to light signal, and will the Data Modulation between upstream data and optical network unit to same up wavelength be sent to the ring of light and returns device 202.
As shown in Figure 2, the data between upstream data and optical network unit are modulated on the transmitter of same up wavelength in a time multiplexed manner.Described data are returned device through the ring of light and are input to wavelength division multiplexer.Data wherein between optical network unit are looped back to the data receiver between the optical network unit of source PON or target P ON through optical line terminal, and upstream data is sent to the receiver in optical line terminal through wavelength division multiplexer 203.
Such as, in an optical network unit 200, at time slot T
i, transmit ascending data; At time slot T
i+ t, the data between transmission light network element.As can be seen from Figure 2, because the same transmitter of the data between upstream data and optical network unit, so the cost of optical network unit can reduce effectively.In addition, Dynamic Bandwidth Allocation agreement also can coordinate the data communication between upstream data and optical network unit.
Due to the wavelength that the data sharing between upstream data and optical network unit is same, inevitably, the bandwidth of part upstream data can be taken by the data between optical network unit.In order to improve the performance of upstream data communication, upstream data bag is first buffered in optical network unit buffer area, once there be the bandwidth of redundancy, Dynamic Bandwidth Allocation agreement is by the loss of the upstream data bandwidth of compensation, namely, time the bandwidth requirement of transfer of data is lower when between optical network unit, more time slot is distributed to the transmitting uplink data of this optical network unit.
In order to overcome the problem as the traditional solution described in background technology, the present invention proposes solution as shown in Figure 3.Fig. 3 shows the schematic diagram of the optical line terminal framework of the optical network unit intercommunication of the full light across PON.Optical line terminal 300 in this figure includes downstream signal transmitter 305, wavelength division multiplexer 303, upward signal receiver 302, and the ring of light returns device 301,1 × 2 optical switch 304 and n × n optical switch 306.
Downstream signal transmitter 305 is for providing light signal in certain downstream wavelength, modulated downlink data to wavelength division multiplexer 303.
Wavelength division multiplexer 303 is coupled to downstream signal transmitter 305 to return device 301 with the ring of light, and for by the light signal of modulated downlink data and different communication wavelength, the light signal of data communication between modulated optical network unit is multiplexed with downlink optical signal, sends to described optical network unit through remote node 307; Also for receiving the uplink optical signal through remote node 307 coming from optical network unit.Wherein, uplink optical signal comprises the light signal of the data communication between the light signal of the modulated upstream data merged in a time division manner and optical network unit.
Upward signal receiver 302 be for receive come from the upstream data of the first output of 1 × 2 optical switch 304 light signal the light signal detecting upstream data to obtain described upstream data.
It is for receiving the uplink optical signal coming from wavelength division multiplexer 303 that the ring of light returns device 301, and uplink optical signal is forwarded to 1 × 2 optical switch 304, also come from the light signal of described n × n optical switch 306 and the downlink optical signal for sending the data communication between optical network unit to wavelength division multiplexer 303 for receiving.
1 × 2 optical switch 304 has an input and first, second output, it is for switching the light signal of the data communication between the light signal of upstream data and optical network unit, optical line terminal 300 is based on the switching of the Type Control 1x2 optical switch 304 of uplink communication, and the type of uplink communication comprises the data communication between upstream data communication and optical network unit.When based on the request of the data communication come between the upstream data communication of optical network unit or described optical network unit, optical line terminal 300 judges that the type of uplink communication is upstream data communication, optical line terminal 300 control 1x2 optical switch 304 is switched to the first output, and the optical signals upward signal receiver 302 of upstream data receives; When optical line terminal 300 judges that the type of uplink communication is the data communication between optical network unit based on the request of the data communication come between the upstream data communication of optical network unit or optical network unit, optical line terminal 300 controls described 1 × 2 optical switch 304 and is switched to the second output, and between optical network unit, the light signal of data is output to the input of the optical switch 306 of described n × n.The input of the optical switch 304 of 1 × 2 comes from for receiving the uplink optical signal that the ring of light returns device 301.
N × n optical switch 306 is the optical network unit intercommunications for realizing across PON, also supports the intercommunication mutually between the optical network unit in the PON of source simultaneously.N × n optical switch 306 has n input and n output.Optical line terminal 300 is based on the switching of the Type Control n × n optical switch 306 communicated between optical network unit, the type communicated between optical network unit comprises across the optical network unit intercommunication in the optical network unit intercommunication of PON or source PON, wherein n represents the number of PON in communication network, source PON is the PON providing the light signal of the data communication between optical network unit to the described input of n × n optical switch, optical network unit intercommunication across PON is the communication from source PON to target P ON, target P ON is any one in n PON in communication network except the PON of source.
N input of n × n optical switch 306 is respectively used to receive the light signal of the second output of 1 × 2 optical switch 304 of the optical line terminal come from corresponding source PON, and the ring of light that the light signal of the data communication between the output of n described in it is used for the optical network unit coming from corresponding source PON is sent in the optical line terminal in each corresponding source PON or target P ON respectively returns device 301.N × n optical switch 306 can be arranged in the optical line terminal of n any one PON of PON, for by the data exchange of a source PON optical network unit to another optical network unit of source PON or by the optical network unit of the data exchange of the optical network unit of source PON to target P ON.Although each remote node 307 shown in Fig. 3 is in different positions, described remote node 307 also can be at same position.
Fig. 4 shows the schematic diagram of n × n optical switch 306.As shown in Figure 4, n × n optical switch 306 is made up of n 1 × n optical switch and n optical combiner.Each 1 × n optical switch in n 1 × n optical switch has 1 input and n output, and its input is for receiving the light signal of the second output of 1 × 2 optical switch of the optical line terminal come from corresponding source PON; Each output in its n output corresponds respectively to any one in n PON, and the light signal for the second output of 1 × 2 optical switch by the optical line terminal come from corresponding source PON is switched to the input of the optical combiner of source PON or target P ON.
Each optical combiner in n optical combiner has n input and 1 output, each input in its n input is used for the light signal of the output receiving each 1 × n optical switch come from n × n optical switch 306 respectively, and optical combiner merging comes from the light signal of the output of each 1 × n optical switch and the ring of light outputted to by the light signal of merging in the optical line terminal in source PON or target P ON returns device.Each target P ON corresponds to an optical combiner.
Be arranged in the optical switch of 1 × n that each PON optical line terminal can control and this optical line terminal is corresponding.Under normal conditions, n × n optical switch 306 state of being switched in the PON of execution source between optical network unit communication.During communication request when between the optical network unit having other PON come from except the PON of source, the optical switch of 1 × n in the optical switch of corresponding n × n be switched to the state performed across the optical network unit intercommunication of PON.In this case, across PON optical network unit between data can be routed to the optical network unit of corresponding target P ON.
In order to the communication mechanism between optical network unit is better described, the communication scenes between an optical network unit between two different PON can be supposed, in this scene, as mentioned above, in order to realize across optical network unit intercommunication in PON or source PON, as shown in Figure 5,2 × 2 optical switches are made up of 1 × 2 optical switch of two and two optical combiners.The corresponding optical combiner of each PON.The input port of the optical combiner of PON-1 is 1-1 port and 2-1 port.Such as, described 1-1 port represents that the data of the optical network unit coming from PON-1 are routed and gets back to PON-1, and described 2-1 port represents that the data of the optical network unit coming from PON-2 are routed to PON-1.Optical combiner corresponding to PON-1 outputs to PON-1 after being merged by the light signal of 1-1 port and 2-1 port.The optical line terminal being positioned at PON-1 or PON-2 can control and 1 × 2 optical switch corresponding to PON-1 or PON-2 independently.
Fig. 6 shows the flow chart communicated between an optical network unit.When an optical network unit will be set up with the communicating of another optical network unit, at distributed time slot T
i+ t, the data between optical network unit are modulated to up wavelength and are transferred to the optical line terminal of the PON belonging to optical network unit.
In the step s 100, optical line terminal receives the light signal coming from the request of data communication between the upstream data communication of optical network unit or optical network unit and the data communication between the light signal of upstream data and optical network unit.
In step s 200, optical line terminal is according to the request of the data communication between the described upstream data communication received or described optical network unit, judge the type of uplink communication and the switching of control 1x2 optical switch, the light signal of the data communication between the light signal of upstream data or described optical network unit is switched to the first output of 1x2 optical switch or the second output of 1x2 optical switch by the type according to described uplink communication.
If the type of uplink communication is upstream data, the light signal of upstream data is switched to the first output by optical line terminal control 1x2 optical switch, and the optical signals receiver of upstream data receives.
If the type of uplink communication is the data communication between optical network unit, the light signal of the data communication between optical network unit is switched to the second output by optical line terminal control 1x2 optical switch, and the light signal of the data communication between optical network unit is output to the input of the optical switch of n × n.
In step S300, optical line terminal judges the type that communicates between optical network unit and the switching of control n × n optical switch, according to the type communicated between optical network unit the light signal of the data between the optical network unit coming from corresponding source PON is sent to respectively the optical line terminal in each corresponding source PON or target P ON.
When optical line terminal judges that the type communicated between described optical network unit is the optical network unit intercommunication of described source PON, optical line terminal control n × n optical switch is switched to the i_i output in n output, previous i wherein in i_i output indicate the light signal of the data communication between described optical network unit to come from source PON that index is i, the light signal of the data communication between a rear i pilot light network element is switched to the described source PON that index is i.As shown in Fig. 5 (a), the optical switch of 1 × 2 of the source PON-1 corresponded in the optical switch of 2 × 2 is switched to 1-1 port by PON-1 optical line terminal.The ring of light of output signal in the PON-1 of source of described 1-1 port returns device and is routed and gets back to source PON-1.
When Optical Network Terminal judges that the type communicated between optical network unit is the optical network unit intercommunication across PON, optical line terminal control n × n optical switch is switched to the i_j output in n output, the light signal of the data communication in i_j output between i pilot light network element comes from the source PON that index is i, the light signal of the data communication between j pilot light network element is switched to the target P ON that index is j, wherein j is not equal to i, i and j is the natural number being less than or equal to arbitrarily n.As shown in Fig. 5 (b), the optical switch of 1 × 2 of the source PON-1 corresponded in the optical switch of 2 × 2 is switched to 1-2 port by source PON-1 optical line terminal.The ring of light of output signal in target P ON-2 of described 1-2 port returns device and is routed to target P ON-2, achieves the optical network unit intercommunication across PON.
It should be appreciated by those skilled in the art, the optical line terminal in other PON also can be switched to other ports by control n × n optical switch in the same way.
To those skilled in the art, obviously the invention is not restricted to the details of above-mentioned one exemplary embodiment, and when not deviating from spirit of the present invention or essential characteristic, the present invention can be realized in other specific forms.Therefore, in any case, all should embodiment be regarded as exemplary, and be nonrestrictive.In addition, significantly, " comprising " one word do not get rid of other elements and step, and wording " one " does not get rid of plural number.Multiple elements of stating in device claim also can be realized by an element.First, second word such as grade is used for representing title, and does not represent any specific order.
Claims (12)
1. the optical line terminal in the PON of communication network, described communication network comprises n PON, and described optical line terminal comprises:
1 × 2 optical switch, there is input and first, second output, it is for switching the light signal of the data communication between the light signal of upstream data and optical network unit, described optical line terminal based on uplink communication Type Control described in the switching of 1x2 optical switch, the type of described uplink communication comprises the data communication between upstream data communication and optical network unit; And
N × n optical switch, there is n input and n output, described optical line terminal is based on the switching of n × n optical switch described in the Type Control communicated between optical network unit, the type communicated between described optical network unit comprises across the optical network unit intercommunication in the optical network unit intercommunication of PON or source PON, wherein n represents the number of PON described in described communication network, described source PON is the PON providing the light signal of the data communication between described optical network unit to the described input of described n × n optical switch, the described optical network unit intercommunication across PON is the communication from described source PON to target P ON, described target P ON is any one in n described PON in described communication network except described source PON.
2. optical line terminal as claimed in claim 1, it is characterized in that, the described input of the optical switch of described 1 × 2 comes from for receiving the uplink optical signal that the ring of light returns device, the described ring of light returns device for receiving the described uplink optical signal coming from wavelength division multiplexer, and described uplink optical signal is forwarded to described 1 × 2 optical switch, also come from the light signal of described n × n optical switch and the downlink optical signal for sending the data communication between described optical network unit to described wavelength division multiplexer for receiving.
3. optical line terminal as claimed in claim 1, it is characterized in that, when described optical line terminal judges that the type of described uplink communication is described upstream data communication based on the request of the data communication come between the described upstream data communication of described optical network unit or described optical network unit, described optical line terminal controls described 1x2 optical switch and is switched to the first output described in it, and the optical signals upward signal receiver of described upstream data receives; When described optical line terminal judges that the type of described uplink communication is the data communication between described optical network unit based on the request of the data communication come between the described upstream data communication of described optical network unit or described optical network unit, described optical line terminal controls described 1 × 2 optical switch and is switched to the second output described in it, and the light signal of the data communication between described optical network unit is output to the input of the optical switch of described n × n.
4. optical line terminal as claimed in claim 1, it is characterized in that, described n input of described n × n optical switch is respectively used to receive the light signal of described second output of described 1 × 2 optical switch of the optical line terminal come from corresponding source PON, and the light signal of the data communication between the output of n described in it is used for the described optical network unit coming from corresponding source PON is sent to the optical line terminal in each corresponding source PON or target P ON respectively.
5. optical line terminal as claimed in claim 1, it is characterized in that, described n × n optical switch comprises:
N 1 × n optical switch, wherein each 1 × n optical switch has 1 input and n output, and described input is for receiving the light signal of described second output of described 1 × 2 optical switch of the described optical line terminal come from corresponding source PON; Each output in a described n output corresponds respectively to any one in a described n PON, and the light signal for the second output of described 1 × 2 optical switch by the optical line terminal come from corresponding source PON is switched to the input of the optical combiner of described source PON or described target P ON; And
N optical combiner, wherein each optical combiner has n input and 1 output, each input in a described n input is used for receiving the light signal coming from the described output of each described 1 × n optical switch respectively, and described optical combiner merges the light signal the described optical line terminal light signal of merging being outputted to described source PON or described target P ON that come from the described output of each described 1 × n optical switch.
6. optical line terminal as claimed in claim 1, it is characterized in that, when described optical line terminal judges that the type communicated between described optical network unit is the optical network unit intercommunication in described source PON, described optical line terminal controls described n × n optical switch and is switched to i_i output in a described n output, previous i in described i_i output indicate the light signal of the data communication between described optical network unit to come from described source PON that index is i, a rear i indicate the light signal of the data communication between described optical network unit to be switched to source PON that described index is i, when described Optical Network Terminal judges that the type communicated between described optical network unit is the described optical network unit intercommunication across PON, described optical line terminal controls described n × n optical switch and is switched to i_j output in a described n output, i in described i_j output indicate the light signal of the data communication between described optical network unit to come from source PON that described index is i, j indicate the light signal of the data communication between described optical network unit to be switched to target P ON that index is j, wherein j is not equal to i, i and j is the natural number being less than or equal to arbitrarily n.
7. optical line terminal as claimed in claim 1, it is characterized in that, also comprise downstream signal transmitter, it is for providing the light signal of in downstream wavelength, modulated downlink data to described wavelength division multiplexer.
8. optical line terminal as claimed in claim 1, it is characterized in that, also comprise described upward signal receiver, its for receive come from the described upstream data of described first output of described 1 × 2 optical switch light signal the light signal detecting described upstream data to obtain described upstream data.
9. optical line terminal as claimed in claim 1, it is characterized in that, also comprise described wavelength division multiplexer, it is coupled to described downstream signal transmitter and the described ring of light returns device, for by the light signal of described modulated downlink data and different communication wavelength, the light signal of data communication between modulated described optical network unit is multiplexed with described downlink optical signal, sends to described optical network unit through remote node; For receiving the described uplink optical signal through described remote node coming from described optical network unit, wherein, described uplink optical signal comprises the light signal of the data communication between the light signal of the modulated described upstream data merged in a time division manner and described optical network unit.
10., for a method for optical network unit intercommunication in the optical line terminal of PON in a communication network, described communication network comprises n PON, and it comprises:
Receive the light signal coming from the request of data communication between the upstream data communication of described optical network unit or optical network unit and the data communication between the light signal of upstream data and optical network unit;
According to the request of the data communication between the described upstream data communication received or described optical network unit, judge the type of uplink communication and the switching of control 1x2 optical switch, the light signal of the data communication between the light signal of described upstream data or described optical network unit is switched to the first output of described 1x2 optical switch or the second output of described 1x2 optical switch by the type according to described uplink communication; And
Judge the type that communicates between optical network unit and the switching of control n × n optical switch, according to the type communicated between described optical network unit the light signal of the data communication between the described optical network unit coming from corresponding source PON is sent to respectively the optical line terminal in each corresponding source PON or target P ON, any one in described source PON n the described PON that to be the PON providing the light signal of the data communication between described optical network unit to the input of described n × n optical switch, described target P ON be in described communication network except described source PON.
11. methods as claimed in claim 10, it is characterized in that, when described optical line terminal judges that the type of described uplink communication is described upstream data communication, described optical line terminal controls described 1x2 optical switch and is switched to its first output, and the optical signals upward signal receiver of described upstream data receives; When described optical line terminal judges that the type of described uplink communication is the data communication between described optical network unit, described optical line terminal controls described 1x2 optical switch and is switched to its second output, and the light signal of the data communication between described optical network unit is output to the input of the optical switch of described n × n.
12. methods as claimed in claim 10, it is characterized in that, when described optical line terminal judges that the type communicated between described optical network unit is the optical network unit intercommunication of described source PON, described optical line terminal controls described n × n optical switch and is switched to i_i output in a described n output, previous i in described i_i output indicate the light signal of the data communication between described optical network unit to come from described source PON that index is i, a rear i indicate the light signal of the data communication between described optical network unit to be switched to described source PON that index is i; When described Optical Network Terminal judges that the type communicated between described optical network unit is the described optical network unit intercommunication across PON, described optical line terminal controls described n × n optical switch and is switched to i_j output in a described n output, i indicate the light signal of the data communication between described optical network unit to come from described source PON that index is i in described i_j output, j indicate the light signal of the data communication between described optical network unit to be switched to described target P ON that index is j, wherein j is not equal to i, i and j is the natural number being less than or equal to arbitrarily n.
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