CN104469562A - ONU supporting inter-ONU interaction and remote node supporting inter-ONU interaction - Google Patents
ONU supporting inter-ONU interaction and remote node supporting inter-ONU interaction Download PDFInfo
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- CN104469562A CN104469562A CN201310429658.XA CN201310429658A CN104469562A CN 104469562 A CN104469562 A CN 104469562A CN 201310429658 A CN201310429658 A CN 201310429658A CN 104469562 A CN104469562 A CN 104469562A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
- H04J14/0228—Wavelength allocation for communications one-to-all, e.g. broadcasting wavelengths
- H04J14/023—Wavelength allocation for communications one-to-all, e.g. broadcasting wavelengths in WDM passive optical networks [WDM-PON]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
- H04J14/0241—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
- H04J14/0241—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths
- H04J14/0242—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON
- H04J14/0249—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON for upstream transmission, e.g. ONU-to-OLT or ONU-to-ONU
- H04J14/025—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON for upstream transmission, e.g. ONU-to-OLT or ONU-to-ONU using one wavelength per ONU, e.g. for transmissions from-ONU-to-OLT or from-ONU-to-ONU
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Abstract
The invention provides an ONU supporting inter-ONU interaction and a remote node supporting inter-ONU interaction. An ONU transmitter supporting inter-ONU interaction in a system containing a plurality of PONs with corresponding uplink and downlink wavelengths comprises a delay line configured to delay inter-ONU data to be transmitted relative to uplink data to be transmitted, a combiner configured to combine the uplink data with the delayed inter-ONU data, and a wavelength-tunable laser source configured to generate optical signals of different wavelengths so as to respectively modulate the uplink data and the inter-ONU data received from the combiner, wherein the inter-ONU data refers to data transmitted by an ONU to other ONUs, and the uplink data refers to data transmitted by an ONU to an OLT.
Description
Technical field
The present invention generally relates to EPON (PON), more specifically, relates to and support mutual ONU and remote node between optical network unit (ONU) in the system comprising multiple PON.
Background technology
Time-division wavelength division multiplexed optical network (Time and Wavelength Division MultiplexedPassive Optical Network, TWDM-PON) recently by FSAN (Full Service Access Network, FSAN) and standardization department of International Telecommunication Union (ITU-T) Q2 group selection as the main frame of next-generation passive optical network (NGPON2), it is characterized in that having the downlink system capacity of at least 40Gb/s and the up-link capacity (list of references 1) of 10Gb/s.By stacking several TDM-PON with different wave length, can be the TWDM-PON with more high bandwidth by traditional TDM-PON system upgrade.The TWDM-PON of typical 40Gb/s is formed the TDM-PON of the downlink bit rate of each 10Gb/s of having by stacking four.
In TWDM-PON system, need to use adjustable laser and adjustable optical filter in ONU side, therefore each ONU can receive arbitrarily and produce in four wavelength one and detects and upward signal transmission for downstream signal.Due to its there is backwards compatibility, technology maturation and parts easily obtain, so TWDM-PON is considered to, closest to the actual scheme realized, win the extensive accreditation of telecom operators.In this article, unless otherwise mentioned, upstream data/signal/link refers to the data/signal/link from ONU to OLT, and downlink data/signal/link refers to the data/signal/link from OLT to ONU.
In TWDM-PON system, an ONU needs the low lingeringly shared data with other ONU high speeds, so except the bandwidth needs meeting descending/upward signal in the PON between optical line terminal (OLT) and each ONU, between different ONU, become extremely important alternately.The possible application scenarios that in TWDM-PON, ONU is mutual comprises:
1) senior Long Term Evolution (LTE-A) multipoint cooperative (CoMP): in LTE-A CoMP technology, directly to be communicated mutually by logic X2 interface for base station and other base stations and cooperates to process the demand more and more higher (list of references 2) of multiple antenna.The traffic carrying capacity exchanged by X2 interface in Estimation System may reach 10% of total traffic, therefore, wishes very much the mutual communication can carrying out high speed, low delay between base station.Such as, NSN product suggested the strictest delay in LTE-A lower than 1ms to maintain required service quality.When high speed and low delay become necessary, can be a kind of possible solution and following trend by the mobile retransmission of PON.In the mobile retransmission network in future, by adopting TWDM-PON framework to support, the base station of high speed and low delay alternately will be quite attractive.
2) neighboring server provides: in traditional 3G/LTE network, all data services must converge to core net, even if some packet may only need through Cellular Networks itself (list of references 3), as shown in Fig. 1 (a).Fig. 1 (a) shows in prior art by the mutual schematic diagram by core net between base station.When this centralized data service becomes more and more general, serious signaling and data business volume pressure will be produced to core net.Therefore, Virtual network operator wishes can directly transmit between base station (such as eNB) to provide effective neighboring server.Fig. 1 (b) shows a kind of schematic diagram of neighboring server of hope, and the transfer of data wherein between transmit leg subscriber equipment (UE) and recipient UE is processed by the data retransmission of base station to base station.
3) business data is shared: along with the explosive growth of data business volume, and the large corporation of such as enterprise and university and so on wishes to set up optical link at a high speed between their different building or branch.Some emerging remote services also need to have interactively to share, process and the virtual ability being distributed in the data of diverse location, with cooperative work timely.
In traditional PON framework, between OLT and each ONU, only have descending and uplink link to use, therefore first the ONU interactive service of an ONU must be sent to OLT by long-distance optical fiber, and then other ONU returned to pointed by this ONU interactive service, this experienced by light-electrical-optical conversion and complicated electronic signal process (list of references 4).Long distance PON transmission has become the demand of Future Access Network, the delay that the roundtrip propagation on 50km optical fiber will produce up to 0.5ms, and this does not also consider the delay that the electronic signal process at OLT place produces.Meanwhile, the live load of OLT and power consumption also inevitably increase.
Therefore, wish that the TWDM-PON solution can developing a kind of novel low cost is to make the ONU that can realize the low delay of high speed for various application mutual.
List of references:
[1]FSAN white paper，“Next-generation2access network technology”，2012.
[2]Thomas Pfeiffer，“Converged Heterogeneous Optical Metro-AccessNetworks”，ECOC，Tu.5.B.1，Torino，Italy，2010.
[3]China Unicom，“Introduction of eNB-to-eNB direct transmissionforproximity service provision”，3GPP TSG RAN WG3#75bis meeting，R3-120571.
[4]Yikai Su，Elaine Wong，et al.，“All-optical virtual private network inpassive optical networks”，Laser＆Photon.Rev，No.6，2008.
Summary of the invention
Therefore, main purpose of the present invention be to provide a kind of low cost of novelty support ONU between mutual solution and the not obvious bandwidth efficiency raising the cost and reduce upward signal.
According to an aspect of the present invention, provide in a kind of system comprising multiple PON and support ONU transmitter mutual between ONU, wherein the plurality of PON has corresponding uplink/downlink wavelength respectively.This ONU transmitter comprises: delay line, it is configured to postpone relative to the upstream data that will send data between the ONU that will send, wherein between ONU, data refer to the data that will be sent to other ONU by ONU, and upstream data refers to the data that will be sent to OLT by ONU; Mixer, it is configured to data between upstream data and the ONU after postponing to carry out conjunction road; Wavelength tunable laser source, its light signal being configured to generation different wave length is to modulate respectively data between the upstream data received from mixer and ONU.
According to a second aspect of the invention, provide in a kind of system comprising multiple PON and support ONU receiver mutual between ONU, wherein the plurality of PON has corresponding uplink/downlink wavelength respectively.This ONU receiver comprises: optical circulator, it is configured to data between the downlink data received with ONU to be separated with the data that will send, wherein downlink data refers to the data received from OLT, between ONU, data are the data from other ONU, and between described downlink data and described ONU, data are with different wave length, send at different time-gap; First optical filter, it is configured to filter out described downlink data according to wavelength; And second tunable optical filter, it is configured to filter out data between described ONU according to wavelength.
According to a third aspect of the present invention, provide in a kind of system comprising multiple PON and support remote node mutual between ONU, wherein the plurality of PON has corresponding uplink/downlink wavelength respectively.This remote node comprises: sampling grating, it has multiple reflected channel, the wavelength of described reflected channel is aimed at wavelength mutual between the ONU in described multiple PON respectively, wherein, upstream data from each ONU in described multiple PON is forwarded to OLT by described sampling grating, and by reflect data between the ONU from each ONU and all ONU be broadcast in described system.
According to a fourth aspect of the present invention, a kind of ONU comprising above-mentioned ONU transmitter and ONU receiver is provided.
According to a fifth aspect of the present invention, a kind of system comprising above-mentioned ONU transmitter, ONU receiver and remote node is provided.
Utilize the solution of the present invention, mutual between the ONU that can realize the low delay of high speed.
Accompanying drawing explanation
After the description below with reference to the specific embodiment of the present invention given by following accompanying drawing, the present invention will be understood better, and other objects of the present invention, details, feature and advantage will become more apparent.In the accompanying drawings:
Fig. 1 (a) shows in prior art by the mutual schematic diagram by core net between base station;
Fig. 1 (b) shows a kind of schematic diagram of neighboring server of hope;
Fig. 2 shows the framework of the mutual TWDM-PON system of support ONU according to the embodiment of the present invention;
Fig. 3 shows the schematic diagram of the structure of ONU mutual between support ONU according to the embodiment of the present invention;
Fig. 4 shows according to the time slot of business between the uplink service in the PON of an example of the present invention and ONU and the schematic diagram of Wavelength Assignment;
Fig. 5 shows according to the time slot of business and the schematic diagram of Wavelength Assignment between the uplink service in the PON of another example of the present invention and ONU;
Fig. 6 shows an example of Wavelength Assignment scheme;
Fig. 7 shows the schematic diagram of the structure according to remote node of the present invention.
Embodiment
In TDM-PON and Wave division multiplexing passive optical network (WDM-PON) system, also once advised that some realized the mutual scheme of ONU, but these schemes all also exist serious inevitable technical problem, are summarized as follows before:
(1) in some versions, ONU is equipped with two lasing light emitters.Except up lasing light emitter, each ONU also needs an extra reflector with different wave length to produce and to launch the business between ONU.This consumes an extra lasing light emitter and therefore considerably increases ONU cost.
(2) in some other schemes, remote node utilizes very complicated active electrical to optical converter that business between ONU is routed to other ONU, and this introduces high time delay, high complexity and finally cause the high cost of whole system greatly.
(3) in addition, in some versions, although use single laser at ONU, but between ONU, business is carried in phase co-wavelength different time-gap with upward signal, like this, ONU is realized for data sharing between ONU by the time slot of predation upward signal.The time interval (or guard time) must amplified in the time domain between two adjacent ONU data services inserts data between ONU.Therefore, between ONU, business will cause serious burden and waste some time slots being used for normal upstream Signal transmissions to normal upward signal, and this greatly reduces bandwidth efficiency and finally makes overall network performance reduce.Further, use electrical to optical converter array to come to extract business between ONU from the upward signal of time domain at OLT, then extracted signal is sent it back every other ONU, this produces serious delay by OLT side.The more important thing is, accurately performing synchronously to extract business between ONU by being a huge challenge, being therefore difficult to actual realization.
Therefore these schemes all can not solve the interaction problems in TWDM-PON between ONU well.
To this, the framework that the invention provides a kind of TWDM-PON system of low cost of novelty is to mutual between the ONU realizing Fast Low-latency.
Below with reference to accompanying drawings preferred implementation of the present disclosure is described in more detail.Although show preferred implementation of the present disclosure in accompanying drawing, but should be appreciated that, the disclosure can be realized in a variety of manners and not should limit by the execution mode of setting forth here.On the contrary, provide these execution modes to be to make the disclosure more thorough and complete, and complete for the scope of the present disclosure can be conveyed to those skilled in the art.
Fig. 2 shows the framework of the mutual TWDM-PON system 200 of support ONU according to the embodiment of the present invention.As shown in Figure 2, system 200 comprises OLT210, and one or more ONU220 is (as ONU1 ..., ONU
i..., ONU
j... ONU
n...), and remote node 230.Wherein, the structure of OLT210 and conventional use identical, therefore repeat no more.ONU220 and remote node 230 use structure designed according to this invention, as below with reference to figure 3 and Fig. 7 describe in detail.
As previously mentioned, such as realized by several TDM-PON systems stacking according to TWDM-PON system 200 of the present invention.((its descending and up wavelength is respectively λ to be called PON1 to comprise 4 TDM-PON systems with TWDM-PON system 200 below
1dand λ
1u), (its descending and up wavelength is respectively λ to PON2
2dand λ
2u), (its descending and up wavelength is respectively λ to PON3
3dand λ
3u), (its descending and up wavelength is respectively λ to PON4
4dand λ
4u)) be described for example.TWDM-PON system 200 according to the present invention both supported ONU in PON also to support alternately the ONU between PON is mutual, thisly transmit and receive wavelength by suitable control ONU alternately and realize.Here, refer to the situation of all ONU in same uplink/downlink wavelength channel in PON, between PON, refer to the situation of different ONU in different uplink/downlink wavelength channel.
For Fig. 2, suppose ONU
1, ONU
iand ONU
nbelong to PON1, ONU
jbelong to PON2.Therefore, as shown in the dotted arrow on right side in Fig. 2, ONU
1with ONU
ibetween mutual be mutual in PON (PON1 is interior), and ON U
jwith ONU
nbetween mutual be mutual (between PON1 and PON2) between PON.
Simply describe according to process mutual in PON of the present invention and between PON below in conjunction with Fig. 2.For situation mutual in PON, as shown in Figure 2, such as, ONU is worked as
1and ONU
iwhen wanting to set up mutual in PON, ONU
1can first with wavelength X
1uand λ
1-intbusiness between up and ONU is sent respectively, wherein λ at different time-gap
1-intoNU
1for wavelength mutual between ONU.At remote node 230 place, from ONU
1wavelength be λ
1-intoNU between business reflected back into ONU by the sampling grating (such as sampled fiber Bragg grating (SFBG)) in remote node 230
i, and from ONU
1wavelength be λ
1uuplink service directly will send to OLT.At ONU
iplace, tunable optical filter wherein can suitably adjust to make λ
1-intpass through, thus realize ONU
1and ONU
ibetween mutual.
For situation mutual between PON, as shown in Figure 2, such as, ONU is worked as
jwant and ONU
nwhen setting up mutual between PON, ONU
jcan first with wavelength X
2uand λ
2-intbusiness between up and ONU is sent respectively, wherein λ at different time-gap
2-intoNU
jfor wavelength mutual between ONU.At remote node 230 place, from ONU
jwavelength be λ
2-intoNU between business got back to ONU by the sampled-grating reflection in remote node 230
n, and from ONU
jwavelength be λ
2uuplink service directly will send to OLT.At ONU
nplace, tunable optical filter wherein can suitably adjust to make λ
2-intpass through, to realize ONU
jand ONU
nbetween mutual, thus between the PON that can set up high speed low delay, the full light of ONU is mutual.
Below with reference to Fig. 3-Fig. 6, structure according to ONU of the present invention and remote node and operation principle thereof are described.
Fig. 3 shows the schematic diagram of the structure of ONU300 mutual between support ONU according to the embodiment of the present invention.ONU300 such as can be used as the ONU220 shown in Fig. 2, as ONU
1..., ONU
i..., ONU
j... ONU
n....
Below from the angle of transmitter and receiver, ONU300 is described respectively.
From the angle of transmitter, as shown in Figure 3, ONU300 comprises two branch roads 302 and 304, is respectively used to produce, receive or otherwise obtain data between upstream data and ONU.Wherein, upstream data 302 is the data that will be sent to OLT (OLT210 as in Fig. 2) by ONU300, and between ONU, data 304 are will by the ONU300 (ONU in such as Fig. 2
1or ONU
j) send to other ONU (ONU in such as Fig. 2
ior ONU
n) interaction data.
ONU300 also comprises delay line 306, for data between ONU 304 are postponed a time Δ t relative to upstream data 302.Delay line 306 makes data 304 between upstream data 302 and ONU can send at different time-gap.Time of delay, Δ t will further describe with reference to figure 4 and Fig. 5 below.
Next, mixer 308 by upstream data 302 and be delayed time Δ t through delay line 306 ONU between data 304 carry out conjunction road, Bing Jianghe road signal is supplied to wavelength tunable laser source 310.
Different from the ONU structure of use recited above two lasing light emitters, ONU300 shown in Fig. 3 only comprises a lasing light emitter 310, the Wavelength tunable of this lasing light emitter 310, thus the light signal of different wave length can be used to modulate data 304 between upstream data 302 and ONU.That is, between upstream data 302 and ONU, data 304 share same lasing light emitter, and do not need to use independently two lasing light emitters.
In one implementation, ONU300 also comprises wavelength control unit 312, and it is for generation of wavelength control signal, adjusts to trigger 310 pairs, wavelength tunable laser source wavelength.
In one implementation, the wavelength adjustment of lasing light emitter 310 carries out in units of a little step delta.Such as, suppose total adjustment step number of the up wavelength between adjacent PON (such as PON1 and PON2) be M (M be more than or equal to 1 integer), then λ
2u-λ
1u=M* Δ.
Therefore, by adopting suitable wavelength control signal, can at different time-gap, with data 304 between the upstream data 302 of different wave length transmission ONU300 and ONU according to ONU300 of the present invention.In this way, between ONU, the transmission of business does not need the time slot robbing upstream data again.
Fig. 4 shows according to the time slot of business between the uplink service in the PON of an example of the present invention and ONU and the schematic diagram of Wavelength Assignment.For business between PON, because the uplink/downlink wavelength of different PON is different, therefore do not need for carrying out time slot allocation alternately between ONU.
As shown in Figure 4, ONU is supposed
1..., ONU
n(its descending and up wavelength is respectively λ all to belong to PON1
1dand λ
1u), the upstream data of these ONU constitutes uplink frame (as uplink frame 1, uplink frame 2 ...), wherein ONU
1..., ONU
nupstream data respectively at time slot T
1..., T
nsend, the time interval between two adjacent time-slots is referred to as guard time GP, that is, GP=T
2-T
1=T
3-T
2=...=T
n-T
n-1.
The wavelength regulation time τ that Fig. 4 particularly illustrates ONU300 is less than the situation of guard time GP.Wavelength regulation time τ is the parameter in wavelength tunable laser source 310 (thus being also ONU300), is determined by the characteristic in wavelength tunable laser source 310 itself.
ONU
1..., ONU
noNU between data relative to time slot T
1..., T
nupstream data respectively time of delay Δ t, between the ONU of these ONU, data constitute frame between ONU (as frame 2 ... between frame between ONU 1, ONU), wherein ONU
1..., ONU
noNU between data respectively at time slot T
1+ Δ t ..., T
n+ Δ t sends.Be appreciated that Δ t only need meet and was not less than wavelength regulation time τ time of delay.
When sending data between ONU, wavelength control unit 312 is triggered to control several step delta of wavelength shift of wavelength tunable laser source 310 to modulate data between ONU.Such as, for ONU
1oNU between the wavelength of data can be λ
1-int, then from ONU
1upstream data to ONU
1oNU between data send wavelength adjustment step number be (λ
1-int-λ
1u)/Δ.
Wavelength for sending data between ONU (is such as respectively used to the λ of PON1, PON2, PON3, PON4
1-int, λ
2-int, λ
3-int, λ
4-int) can be set between two neighboring upstream wavelength any wavelength.
In one implementation, for sending the wavelength X of data between ONU
1-int, λ
2-int, λ
3-int, λ
4-intbe configured to the centre of two neighboring upstream wavelength.Like this, for from for ONU transmitting uplink data wavelength to the wavelength for transfer of data ONU wavelength adjustment (such as from λ
1uto λ
1-int), the step number of wavelength adjustment is that the up wavelength adjustment of normal PON is (such as from λ
1uto λ
2u) the half of total wavelength adjustment step number.
Be appreciated that if do not have ONU interaction demand, then wavelength adjustment is also unnecessary.
Carry out above-mentioned adjustment to the wavelength of lasing light emitter 310 under the control of wavelength control unit 312 after, the light of the wavelength after having adjustment is used to modulate to launch to interaction data between ONU.From different ONU ONU between data be configured for frame between ONU mutual ONU.Note, in this case, between ONU, business can reuse time slot (the such as ONU of the uplink service carrying other ONU
1oNU between data can with ONU
2upstream data at time slot T
2overlap, as shown in Figure 4), because they operate at different wave length.Identical wavelength adjustment and ONU interaction data production method can be similar be applied to all ONU.
Next, with wavelength X
1-intafter have sent interaction data between ONU (such as frame 1 between ONU), the wavelength of lasing light emitter 310 can oppositely be adjusted identical step number under the effect of the control signal of wavelength control unit 312 and turn back to normal condition λ to make the wavelength of ONU300
1u, to continue to send upstream data in uplink frame 2.Between the ONU that this process can repeat to carry out frame between other up and ONU, data produce and wavelength convert.
Fig. 5 shows according to the time slot of business and the schematic diagram of Wavelength Assignment between the uplink service in the PON of another example of the present invention and ONU.The wavelength regulation time τ that Fig. 5 particularly illustrates ONU300 is greater than the situation of guard time GP.As shown in Figure 5, if wavelength regulation time τ is greater than guard time, then between ONU, data service still only need postpone the time Δ t that is not less than wavelength regulation time τ.Then, Data Modulation between wavelength adjustment and ONU can be carried out according to the same way described in Fig. 4.In this case, between ONU, data still can be overlapping in time with the upstream data of other ONU.Such as, in Figure 5, between the ONU of ONU1, data can reuse the ascending time slot T of ONU3
3.Between ONU after transfer of data, method like application class can carry out wavelength adjustment and normal upstream data is modulated.
As can be seen from Figure 4 and Figure 5, no matter wavelength regulation time τ is greatly little, only Δ t time of delay need be set to be not less than wavelength regulation time τ, and also do not have strict requirement to the relation between time of delay Δ t and guard time GP.That is, the solution of the present invention does not limit for the wavelength regulation time τ of ONU, thus can be applied to the Wavelength tunable ONU with various different wavelength regulation time τ that is existing or that occur in the future arbitrarily.The method of advising in the present invention is not strict with for wavelength tuning speeds.
Fig. 6 shows an example of Wavelength Assignment scheme, wherein supposes upstream wavelength channels interval 100GHz.The mutual wavelength of ONU of each channel is set to the up wavelength with PON and is separated by respectively 50GHz.Such as, λ
1-intbe set to from λ
1uskew 50GHz.When starting alternately between each ONU, the wavelength in wavelength tunable laser source 310 is adjusted to λ
1-int, λ
2-int, λ
3-int, λ
4-intin of correspondence, this is consistent with in the reflection wavelength of sampling grating, and therefore between ONU, business will directly be reflected back other ONU, no longer needs the long propagation of complicated light-between electrical-optical conversion with OLT and ONU.
Go back to Fig. 3 now, from the angle of receiver, ONU300 is described below.
ONU300 as receiver comprises optical circulator 314, for by data between the downlink data received and ONU and data separating between the upstream data that will send and ONU.Specifically, wavelength tunable laser source 310 launch modulation after upstream data 302 and ONU between data 304 after optical circulator 314, export from the port 2 of optical circulator 314, and be sent to remote node (as remote node 230)., export from the port 3 of optical circulator 314 after optical circulator 314 from data (other ONU from outside ONU300) between the downlink data (from OLT210) of remote node 230 and ONU.
ONU300 also comprises wavelength division multiplexing (WDM) filter 316, and it is for being positioned between the downlink data of different wave length band and ONU data separating to two branch roads 318 and 320.Because interactive signal between downstream signal and ONU takies different wavelength bands (such as downstream signal takies L+ wavelength band, and between ONU, signal takies C-wavelength band), a thick WDM filter 316 therefore can be used to be separated this two kinds of signals.Here, for simplicity, respectively data between isolated downlink data and ONU are called data 320 between downlink data 318 and ONU.
In branch road 318, ONU300 also comprises optical filter 322, for filtering out downlink data 318.Such as, optical filter 322 can be a centre wavelength is λ
1dband pass filter (BPF), it can filter out wavelength is λ
1ddownlink data 318.
In branch road 320, ONU300 also comprises adjustable optical filter 324, for filtering out data 320 between ONU.Such as, optical filter 324 can be the adjustable band pass filter (BPF) of a centre wavelength, and its centre wavelength can at λ
1-int, λ
2-int, λ
3-int, λ
4-intbetween regulate, to filter out wavelength for λ
1-int, λ
2-int, λ
3-intor λ
4-intoNU between data 320.
Here, when between the ONU that optical filter 324 filters out the wavelength and ONU300 self of data 320 ONU between wavelength identical time, can determine that data 320 between ONU are interaction data, i.e. interaction datas in PON between ONU from other ONU in same PON.And when between the ONU that optical filter 324 filters out the wavelength and ONU300 self of data 320 ONU between wavelength different time, can determine that data 320 between ONU are interaction data, i.e. interaction datas between PON between ONU from other ONU in different PON.
Next, between the downlink data 318 that filters out of optical filter 322 and 324 and ONU, data 320 are forwarded to corresponding downlink receiver 326 and the mutual receiver 328 of ONU respectively to process.
In this way, business between downlink business and ONU can be detected in each ONU simultaneously, and by adjustment tunable optical filter 324, can support that any ONU in PON or between PON is mutual.
It will be understood by those skilled in the art that in ONU300 and also can not comprise WDM filter 316.In this case, ONU300 is not separated roughly data between the downlink data received with ONU according to wavelength band, but directly filters out data between downlink data and ONU by optical filter 322 and tunable optical filter 324 according to wavelength.
Fig. 7 shows the schematic diagram of the structure according to remote node 700 of the present invention.Remote node 700 such as can be used as the remote node 230 in Fig. 2.
As shown in Figure 7, remote node 700 comprises light shunt/mixer 710 and sampling grating 720.
Downlink data from OLT for the upstream data from each ONU being coupled to same Optical Fiber Transmission to OLT (as OLT210), and is assigned to all ONU by light shunt/mixer 710.Light shunt/mixer 710 in the present invention is identical with traditional light shunt/mixer, therefore repeats no more in this article.
Sampling grating 720 is specifically designed has four reflected channel, the wavelength of these reflected channel mutual wavelength (λ respectively and between each ONU
1-int, λ
2-int, λ
3-int, λ
4-int) aim at.
In one implementation, sampling grating 720 comprises sampled fiber Bragg grating (SFBG).
Utilize this specially designed SFBG720, at remote node 700 place, descending and up wavelength (λ
1d, λ
2d, λ
3d, λ
4dand λ
1u, λ
2u, λ
3u, λ
4u) can directly be sent by SFBG720, and mutual wavelength (λ between ONU
1-int, λ
2-int, λ
3-int, λ
4-int) will be reflected and be broadcast to all ONU.
The method and apparatus that invention proposes a kind of novelty is mutual with the full light of ONU realizing the low delay of high speed in TWDM-PON.Compared with scheme of the prior art, major advantage of the present invention is:
1, low cost: to use two ONU lasing light emitters to be respectively used to Signal transmissions between up and ONU in prior art different, in the present invention, only adopt in ONU one in TWDM-PON ONU lasing light emitter that is necessary, Wavelength tunable modulate interactive signal between upward signal and ONU respectively, thus save ONU cost greatly and provide senior interactive function.
2, bandwidth efficiency is high: different from traditional scheme (this scheme can reduce upstream bandwidth efficiency greatly) business between ONU be loaded into by the time interval between the adjacent ONU uplink service of increase two in uplink service, in the present invention, the time slot allocation of ONU uplink service is not by mutual impact.Between ONU, the time slot of upstream PON signals is not robbed in data service, because these two kinds of business transmit at different wavelength channels, this is adjustable wavelength laser supported.In the time domain, between ONU, data even can be overlapping with the uplink service of other ONU, and therefore bandwidth efficiency can greatly improve, such as, almost double than conventional method.
3, low delay: from conventional method, business between ONU is sent to OLT and changes different with electronic signal process to carry out complicated light-electricity, in the present invention, the remote node effective full light ONU that uses compact sampling FBG (SFBG) to realize in TWDM-PON framework with low-down cost and low delay is mutual.Between ONU, interactive service easily can be extracted in a frequency domain by SFBG from uplink service, does not therefore need complicated electrical-optical conversion and Domain Synchronous to distinguish the business of this two type.Further, the operating load of OLT and power consumption can greatly reduce.For the situation of the distribution link 5km between ONU and remote node, ONU postpones to be low to moderate 50us alternately.
4, arbitrary ONU is mutual: utilize the ONU structure designed by the present invention, can be mutual by the full light ONU selecting suitable wavelength to realize to comprise between any ONU of communicating in PON and between PON.
5, power system capacity is improved: can support all mutual data service sent with different wave length from different ONU in system, therefore mutual between ONU power system capacity and network efficiency greatly strengthen simultaneously.
Consider these benefits, the technology advised is the very attractive solution of one for mutual between the ONU realizing the low delay of high speed in TWDM-PON, can become a kind of solution got a good chance of of the X2 interface between baseband pool in the light in future wireless convergence Access Network.
Above for by the stacking TWDM-PON of 4 TDM-PON to invention has been detailed description, but scope of the present invention is not limited thereto, but can be applied to comprise arbitrarily multiple have in the system of the PON of different uplink/downlink wavelength to realize between ONU mutual.
In one or more exemplary design, the function that can realize described in the application by hardware, software, firmware or their combination in any.If realized with software, then can using described function as one or more instruction or code storage on a computer-readable medium, or transmit as the one or more instruction on computer-readable medium or code.Computer-readable medium comprises computer-readable storage medium and communication media, and wherein communication media comprises and contributes to computer program is delivered to another place arbitrary medium from a place.Storage medium can be the addressable any usable medium of universal or special computer.This computer-readable medium can comprise, such as but not limited to, RAM, ROM, EEPROM, CD-ROM or other optical disc memory apparatus, disk storage device or other magnetic storage apparatus, or can be used for other medium any carrying or store the code modules of hope with the form of universal or special computer or the addressable instruction of universal or special processor or data structure.Further, any connection also can be known as computer-readable medium.Such as, if software be use coaxial cable, optical fiber cable, twisted-pair feeder, the wireless technology of Digital Subscriber Line (DSL) or such as infrared ray, radio and microwave and so on is come from website, server or other remote source, so the wireless technology of coaxial cable, optical fiber cable, twisted-pair feeder, DSL or such as infrared ray, radio and microwave and so on is also included within the definition of medium.
Can realize by general processor, digital signal processor (DSP), application-specific integrated circuit (ASIC) (ASIC), field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components or the combination in any for performing function as herein described or perform in conjunction with various exemplary logical block, module and the circuit described by the disclosure.General processor can be microprocessor, or processor also can be the processor of any routine, controller, microcontroller or state machine.Processor also can be implemented as the combination of computing equipment, such as, and the combination of the combination of DSP and microprocessor, multi-microprocessor, one or more microprocessor and DSP kernel, or other this kind of structure any.
Those of ordinary skill in the art it is also understood that various exemplary logical block, module, circuit and algorithm steps that the embodiment in conjunction with the application describes can be embodied as electronic hardware, computer software or the combination of the two.In order to clearly represent this interchangeability between hardware and software, all around its function, general description is carried out to various exemplary parts, block, module, circuit and step above.Be embodied as hardware as this function or be embodied as software, the design constraint depending on specific application and apply over the whole system.Those skilled in the art for often kind of application-specific, can realize described function in the mode of accommodation, but, thisly realize decision-making and should not be construed as and deviate from protection scope of the present invention.
Above description of the present disclosure is for enabling any those of ordinary skill of this area realize or use the present invention.To those skilled in the art, various amendment of the present disclosure is all apparent, and general principle defined herein also can be applied to other distortion when not departing from spirit of the present invention and protection range.Therefore, the present invention is not limited to example as herein described and design, but consistent with the widest scope of principle disclosed herein and novel features.
Claims (13)
1. in the system comprising multiple EPON (PON), support an ONU transmitter mutual between optical network unit (ONU), wherein said multiple PON has corresponding uplink/downlink wavelength respectively, and described ONU transmitter comprises:
Delay line, it is configured to postpone relative to the upstream data that will send data between the ONU that will send, wherein between ONU, data refer to the data that will be sent to other ONU by described ONU, and upstream data refers to the data that will be sent to optical line terminal (OLT) by described ONU;
Mixer, it is configured to data between described upstream data and the ONU after postponing to carry out conjunction road;
Wavelength tunable laser source, its light signal being configured to generation different wave length is to modulate respectively data between the upstream data received from described mixer and ONU.
2. ONU transmitter as claimed in claim 1, also comprises:
Wavelength control unit, it is configured to produce wavelength control signal, adjusts wavelength to trigger described wavelength tunable laser source.
3. ONU transmitter as claimed in claim 1, the wavelength adjustment in wherein said wavelength tunable laser source carries out in units of a little step-length.
4. ONU transmitter as claimed in claim 1, wherein said adjustable wavelength laser is set to any wavelength between two neighboring upstream wavelength for the wavelength sending data between described ONU.
5. ONU transmitter as claimed in claim 1, wherein said adjustable wavelength laser is arranged on the centre of two neighboring upstream wavelength for the wavelength sending data between described ONU.
6. ONU transmitter as claimed in claim 1, wavelength, have sent between described ONU after data, is oppositely adjusted the up wavelength got back to and send for upstream data by wherein said adjustable wavelength laser.
7. in the system comprising multiple EPON (PON), support an ONU receiver mutual between optical network unit (ONU), wherein said multiple PON has corresponding uplink/downlink wavelength respectively, and described ONU receiver comprises:
Optical circulator, it is configured to data between the downlink data received with ONU to be separated with the data that will send, wherein downlink data refers to the data received from optical line terminal (OLT), between ONU, data are the data from other ONU, and between described downlink data and described ONU, data are with different wave length, send at different time-gap;
First optical filter, it is configured to filter out described downlink data according to wavelength; And
Second tunable optical filter, it is configured to filter out data between described ONU according to wavelength.
8. ONU receiver as claimed in claim 7, wherein said second tunable optical filter is the adjustable band pass filter of a centre wavelength, and its centre wavelength is corresponding for the respective wavelength of transfer of data between ONU with described multiple PON respectively.
9. ONU receiver as claimed in claim 7, also comprises:
Wavelength division multiplexing (WDM) filter, before it is arranged in described first optical filter and described second tunable optical filter, be separated data between described downlink data and described ONU for the difference of wavelength band that is positioned at according to data between described downlink data with described ONU.
10. in the system comprising multiple EPON (PON), support a remote node mutual between optical network unit (ONU), wherein said multiple PON has corresponding uplink/downlink wavelength respectively, and described remote node comprises:
Sampling grating, it has multiple reflected channel, and the wavelength of described reflected channel is aimed at mutual wavelength between the ONU of described multiple PON respectively,
Wherein, the upstream data from each ONU in described multiple PON is forwarded to optical line terminal (OLT) by described sampling grating, and by reflect data between the ONU from each ONU and all ONU be broadcast in described system.
11. remote nodes as claimed in claim 10, also comprise:
Light shunt/mixer, it is configured to the upstream data from each ONU is coupled to same optical fiber to be transferred to OLT, and the downlink data from OLT is assigned to all ONU.
In the system comprising multiple EPON (PON), support ONU mutual between optical network unit (ONU) for 12. 1 kinds, comprise the ONU transmitter according to any one of claim 1-6 and ONU receiver as claimed in any one of claims 7-9.
Support system that is mutual, that comprise multiple EPON (PON) between optical network unit (ONU), comprise the ONU transmitter according to any one of claim 1-6, as claimed in any one of claims 7-9 ONU receiver and the remote node according to any one of claim 10-11 for 13. 1 kinds.
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| CN201310429658.XA CN104469562B (en) | 2013-09-18 | 2013-09-18 | The ONU and remote node of interaction between support ONU |
| TW103127767A TW201513586A (en) | 2013-09-18 | 2014-08-13 | ONU and remote node for supporting inter-ONU internetworking |
| PCT/IB2014/002112 WO2015040484A2 (en) | 2013-09-18 | 2014-09-12 | Onu and remote node for supporting inter-onu internetworking |
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Also Published As
| Publication number | Publication date |
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| WO2015040484A3 (en) | 2015-06-11 |
| CN104469562B (en) | 2018-12-04 |
| WO2015040484A2 (en) | 2015-03-26 |
| TW201513586A (en) | 2015-04-01 |
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