CN104469562B - The ONU and remote node of interaction between support ONU - Google Patents
The ONU and remote node of interaction between support ONU Download PDFInfo
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- CN104469562B CN104469562B CN201310429658.XA CN201310429658A CN104469562B CN 104469562 B CN104469562 B CN 104469562B CN 201310429658 A CN201310429658 A CN 201310429658A CN 104469562 B CN104469562 B CN 104469562B
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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 present invention provides a kind of ONU and remote node for supporting to interact between ONU.It is a kind of that the ONU transmitter of interaction includes: delay line between support ONU in the system comprising multiple PON for being respectively provided with corresponding uplink/downlink wavelength, it is configured as postponing data the ONU to be sent relative to the upstream data to be sent, wherein data refer to the data that other ONU are sent to by ONU between ONU, and upstream data refers to the data that OLT is sent to by ONU；Combiner is configured as data between the ONU after upstream data and delay being combined；Wavelength tunable laser source is configured as generating the optical signal of different wave length to be modulated respectively to from data between the received upstream data of combiner and ONU.
Description
Technical field
The present invention is generally related to passive optical network (PON), more specifically, is related in the system comprising multiple PON
The middle ONU and remote node for supporting interaction between optical network unit (ONU).
Background technique
Time-division wavelength division multiplexed optical network (Time and Wavelength Division Multiplexed Passive
Optical Network, TWDM-PON) recently by full service access network (Full Service Access Network,
) and master of International Telecommunication Union's standardization sector (ITU-T) Q2 group selection as next-generation passive optical network (NGPON2) FSAN
Want framework, it is characterised in that have the downlink system capacity of at least 40Gb/s and the up-link capacity (bibliography 1) of 10Gb/s.
There are several TDM-PON of different wave length by stacking, can be with more high bandwidth by traditional TDM-PON system upgrade
TWDM-PON.The TWDM-PON of typical 40Gb/s is the TDM- by stacking four pairs of each downlink bit rates with 10Gb/s
What PON was constituted.
In TWDM-PON system, need in the side ONU using adjustable laser and adjustable optical filter, therefore each
ONU arbitrarily can receive and generate one in four wavelength to send for downlink signal detection and uplink signal.Due to it
It is easy to get with backwards compatibility, technology maturation and component, so TWDM-PON is considered as closest to actually realizing
Scheme has won being widely recognized as telecom operators.Herein, unless otherwise mentioned, upstream data/signal/link refers to
Data/signal/link from ONU to OLT, downlink data/signal/link refer to data/signal/link from OLT to ONU.
In TWDM-PON system, an ONU needs with other ONU high speed low latencies shared data, so in addition to full
Except downlink/uplink signal bandwidth needs in PON between sufficient optical line terminal (OLT) and each ONU, between different ONU
Interaction become extremely important.The possible application scene of ONU interaction includes: in TWDM-PON
1) senior long term evolution (LTE-A) multipoint cooperative (CoMP): in LTE-A CoMP technology, for base station and other
Base station is directly communicated with each other and is cooperated by logic X2 interface higher and higher (bibliography 2) to handle the demand of mutiple antennas.
It is likely to be breached the 10% of total traffic by the portfolio that X2 interface exchanges in Estimation System, therefore, it is highly desirable to base station
Between be able to carry out high speed, low latency communicates with each other.It is lower than for example, NSN product suggested the most stringent of delay in LTE-A
1ms is to maintain required service quality.When high speed and low latency become necessary, one kind can be by the mobile retransmission of PON
It possible solution and following trend.Height is supported by using TWDM-PON framework in following mobile retransmission network
The base station interaction of speed and low latency will be quite attractive.
2) neighboring server provides: in traditional 3G/LTE network, all data services must converge to core net, even if
Certain data groupings may be it is only necessary to pass through Cellular Networks itself (bibliography 3), as shown in Fig. 1 (a).Fig. 1 (a) is shown
In the prior art by passing through the schematic diagram of the interaction of core net between base station.When this centralized data service becomes increasingly
When universal, it will generate serious signaling and data business volume pressure to core net.Therefore, network operator wishes base station (example
Such as eNB) between can directly transmit to provide effective neighboring server.Fig. 1 (b) shows a kind of showing for desired neighboring server
It is intended to, the data forwarding that wherein data between sender's user equipment (UE) and recipient UE are transmitted through base station to base station is come
Processing.
3) business data is shared: with the explosive growth of data business volume, the mainframe of such as enterprise and university etc
Structure wishes the optical link that high speed is established between their different buildings or branch.Some emerging remote services also need
The ability that there is interactive shared, processing and virtualization to be distributed in the data of different location, with timely cooperative work.
In traditional PON framework, only have downlink and uplink transmission link can be used between OLT and each ONU, therefore one
The ONU interactive service of a ONU must be sent to OLT by long-distance optical fiber first, then return again to and give the ONU interactive service institute
Other ONU being directed toward, this experienced optical-electrical-optical conversion and complicated electronic signal process (bibliography 4).Long range PON is passed
The defeated demand for having become Future Access Network, the roundtrip propagation on 50km optical fiber will generate the delay for being up to 0.5ms, this is not examined also
Consider delay caused by the electronic signal process at OLT.Meanwhile the workload and power consumption of OLT also inevitably increase.
Accordingly, it is desirable to be able to develop a kind of TWDM-PON solution of novel low cost so that for various applications
For can be realized high speed low latency ONU interaction.
Bibliography:
[1] FSAN white paper, " Next-generation2access network technology ", 2012.
[2] Thomas Pfeiffer, " Converged Heterogeneous Optical Metro-Access
Networks ", ECOC, Tu.5.B.1, Torino, Italy, 2010.
[3] China Unicom, " Introduction of eNB-to-eNB direct transmissionfor
Proximity service provision ", 3GPP TSG RAN WG3#75bis meeting, R3-120571.
[4] Yikai Su, Elaine Wong, et al., " All-optical virtual private network
In passive optical networks ", Laser & Photon.Rev, No.6,2008.
Summary of the invention
Therefore, the main object of the present invention is to provide the solution of interaction between a kind of support ONU of novel low cost
Without significantly improving cost and reducing the bandwidth efficiency of uplink signal.
According to an aspect of the invention, there is provided a kind of interaction between support ONU in the system comprising multiple PON
ONU transmitter, wherein multiple PON is respectively provided with corresponding uplink/downlink wavelength.The ONU transmitter includes: delay line,
It is configured as postponing data the ONU to be sent relative to the upstream data to be sent, and wherein data refer between ONU
The data of other ONU are sent to by ONU, upstream data refers to the data that OLT is sent to by ONU；Combiner is configured
For data between the ONU after upstream data and delay are combined；Wavelength tunable laser source is configured as generating different wave length
Optical signal to be modulated respectively to from data between the received upstream data of combiner and ONU.
According to the second aspect of the invention, a kind of interaction between support ONU in the system comprising multiple PON is provided
ONU receiver, wherein multiple PON is respectively provided with corresponding uplink/downlink wavelength.The ONU receiver includes: optical circulator,
It is configured as data between the downlink data that will be received and ONU and separates with the data to be sent, and wherein downlink data is
Refer to from data between the received data of OLT, ONU it is the data from other ONU, data are between the downlink data and the ONU
It is sent with different wave length, in different time-gap；First optical filter is configured as filtering out the lower line number according to wavelength
According to；And second tunable optical filter, it is configured as filtering out data between the ONU according to wavelength.
According to the third aspect of the present invention, a kind of interaction between support ONU in the system comprising multiple PON is provided
Remote node, wherein multiple PON is respectively provided with corresponding uplink/downlink wavelength.The remote node includes: sampling grating,
With multiple reflected channels, interaction wavelength is aligned the wavelength of the reflected channel between the ONU in the multiple PON respectively,
In, the upstream data of each ONU in the multiple PON is forwarded to OLT by the sampling grating, and will be come from each
Data reflect and are broadcast to all ONU in the system between the ONU of ONU.
According to the fourth aspect of the present invention, a kind of ONU comprising above-mentioned ONU transmitter and ONU receiver is provided.
According to the fifth aspect of the present invention, it provides a kind of comprising above-mentioned ONU transmitter, ONU receiver and long-range section
The system of point.
Using the solution of the present invention, interaction between the ONU of high speed low latency can be realized.
Detailed description of the invention
It, will be more preferable geographical after the description below with reference to a specific embodiment of the invention given by following drawings
The solution present invention, and other objects of the present invention, details, features and advantages will become apparent.In the accompanying drawings:
Fig. 1 (a) shows the schematic diagram by passing through the interaction of core net between base station in the prior art；
Fig. 1 (b) shows a kind of schematic diagram of desired neighboring server；
Fig. 2 shows the frameworks of the TWDM-PON system of the support ONU of embodiment according to the present invention interaction；
Fig. 3 shows the schematic diagram of the structure of the ONU of interaction between the support ONU of embodiment according to the present invention；
Fig. 4 shows the time slot and wavelength of business between uplink service and ONU in the PON of an example according to the present invention
The schematic diagram of distribution；
Fig. 5 shows the time slot and wave of business between uplink service and ONU in the PON of another example according to the present invention
The schematic diagram of long distribution；
Fig. 6 shows an example of Wavelength Assignment scheme；
Fig. 7 shows the schematic diagram of the structure of remote node according to the present invention.
Specific embodiment
In TDM-PON and Wave division multiplexing passive optical network (WDM-PON) system, also once suggested some realizations before
The scheme of ONU interaction, however these schemes are summarized as follows all there is serious inevitable technical problem:
(1) in some schemes, there are two laser sources for ONU outfit.Other than uplink laser source, each ONU also needs
One additional transmitter with different wave length is to generate and emit the business between ONU.This consumes an additional laser
Source and therefore considerably increase ONU cost.
(2) in some other schemes, remote node utilizes extremely complex active electrical to optical converter by business between ONU
Be routed to other ONU, this greatly introduce high time delay, high complexity and ultimately caused whole system it is high at
This.
(3) in addition, in some schemes, although using single laser, business and uplink signal between ONU in ONU
It is carried in phase co-wavelength but different time-gap, in this way, ONU interaction is by robbing the time slot of uplink signal to be used between ONU
Data sharing is realized.Must amplify in the time domain between two adjacent ONU data services time interval (or protection when
Between) it is inserted into data between ONU.Therefore, business will cause seriously to bear and waste to normal uplink signal between ONU
For the time slot of normal upstream signal transmission, this greatly reduces bandwidth efficiency and finally overall network performance is dropped
It is low.Also, the business between OLT extracts ONU from the uplink signal of time domain using electrical to optical converter array, then will be extracted
Signal send back every other ONU, this will generate serious delay in the side OLT.Importantly, accurate execute synchronizes to mention
Taking business between ONU will be a huge challenge, therefore be difficult practical realization.
Therefore these schemes not can be well solved the interaction problems in TWDM-PON between ONU.
In this regard, the present invention provides a kind of frameworks of the TWDM-PON system of novel low cost to realize Fast Low-latency
ONU between interaction.
The preferred embodiment of the disclosure is more fully described below with reference to accompanying drawings.Although showing the disclosure in attached drawing
Preferred embodiment, however, it is to be appreciated that may be realized in various forms the disclosure without the embodiment party that should be illustrated here
Formula is limited.On the contrary, these embodiments are provided so that this disclosure will be more thorough and complete, and can be by the disclosure
Range is fully disclosed to those skilled in the art.
Fig. 2 shows the frameworks of the TWDM-PON system 200 of the support ONU of embodiment according to the present invention interaction.Such as
Shown in Fig. 2, system 200 includes OLT210, one or more ONU220 (such as ONU1 ..., ONUi、......、
ONUj、......ONUn...) and remote node 230.Wherein, the structure of OLT210 with it is conventional use of identical, therefore
It repeats no more.ONU220 and remote node 230 use structure designed according to this invention, such as detailed below with reference to Fig. 3 and Fig. 7 institute
It states.
As previously mentioned, TWDM-PON system 200 according to the present invention is, for example, by stacking several TDM-PON systems
It realizes.It include below that 4 TDM-PON systems (are referred to as PON1 (its downlink and uplink wavelength with TWDM-PON system 200
Respectively λ1dAnd λ1u), (its downlink and uplink wavelength is respectively λ to PON22dAnd λ2u), (its downlink and uplink wavelength is respectively PON3
λ3dAnd λ3u), (its downlink and uplink wavelength is respectively λ to PON44dAnd λ4u)) for be described.TWDM- according to the present invention
PON system 200 had both supported the interaction of the ONU in PON or the ONU interaction between PON, this interaction is supported to pass through control ONU appropriate
Emit and receives wavelength to realize.Here, situation of all ONU in same uplink/downlink wavelength channel, PON are referred in PON
Between refer to situation of the different ONU in different uplink/downlink wavelength channels.
By taking Fig. 2 as an example, it is assumed that ONU1、ONUiAnd ONUnBelong to PON1, ONUjBelong to PON2.Therefore, such as right side in Fig. 2
Shown in dotted arrow, ONU1With ONUiBetween interaction be interaction (in PON1), and ON U in PONjWith ONUnBetween interaction be
Interaction between PON (between PON1 and PON2).
The process of PON between interaction is briefly described in PON according to the present invention below with reference to Fig. 2.For interaction in PON
Situation, as shown in Figure 2, for example, working as ONU1And ONUiWhen wanting to set up interaction in PON, ONU1It can be first with wavelength X1uWith
λ1-intBusiness between uplink and ONU is sent respectively in different time-gap, wherein λ1-intIt is ONU1Wavelength for interaction between ONU.Remote
At Cheng Jiedian 230, ONU is come from1Wavelength be λ1-intONU between business (such as sampled by the sampling grating in remote node 230
Fiber bragg grating (SFBG)) reflect back into ONUi, and come from ONU1Wavelength be λ1uUplink service will be transmitted directly to
OLT.In ONUiPlace, tunable optical filter therein can be with appropriate adjustment so that λ1-intPass through, to realize ONU1And ONUiIt
Between interaction.
In the case of interaction between PON, as shown in Figure 2, for example, working as ONUjDesired and ONUnWhen establishing interaction between PON,
ONUjIt can be first with wavelength X2uAnd λ2-intBusiness between uplink and ONU is sent respectively in different time-gap, wherein λ2-intIt is ONUjWith
The wavelength of interaction between ONU.At remote node 230, ONU is come fromjWavelength be λ2-intONU between business by remote node
Sampled-grating reflection in 230 returns to ONUn, and come from ONUjWavelength be λ2uUplink service will be transmitted directly to OLT.?
ONUnPlace, tunable optical filter therein can be with appropriate adjustment so that λ2-intPass through, to realize ONUjAnd ONUnBetween friendship
Mutually, the full light interaction of ONU between the PON so as to establish high speed low latency.
The structure and its working principle of ONU and remote node according to the present invention are described below with reference to Fig. 3-Fig. 6.
Fig. 3 shows the schematic diagram of the structure of the ONU300 of interaction between the support ONU of embodiment according to the present invention.
ONU300 for example may be used as ONU220 shown in Fig. 2, such as ONU1、......、ONUi、......、ONUj、
......ONUn、......。
ONU300 is described from the angle of transmitter and receiver individually below.
From the perspective of transmitter, as shown in Figure 3, ONU300 includes two branches 302 and 304, is respectively used to produce
Raw, reception otherwise obtains data between upstream data and ONU.Wherein, upstream data 302 is to be sent to by ONU300
The data of OLT (OLT210 in such as Fig. 2), between ONU data 304 be will be by ONU300 (such as the ONU in Fig. 21Or ONUj) send
Give other ONU (such as ONU in Fig. 2iOr ONUn) interaction data.
ONU300 further includes delay line 306, when for data 304 between ONU to be postponed one relative to upstream data 302
Between Δ t.Delay line 306 enables data 304 between upstream data 302 and ONU to send in different time-gap.Delay time Δ t
It will be further described below with reference to Fig. 4 and Fig. 5.
Next, combiner 308 delays number between the ONU of time Δ t by upstream data 302 and by delay line 306
It is combined according to 304, and combining signal is supplied to wavelength tunable laser source 310.
Use the ONU structure of two laser sources different from recited above, ONU300 shown in Fig. 3 only includes one and swashs
Light source 310, the Wavelength tunable of the laser source 310, so as to use the optical signal of different wave length to upstream data 302 and ONU
Between data 304 be modulated.That is, data 304 share same laser source between upstream data 302 and ONU, without using
Independent two laser sources.
In one implementation, ONU300 further includes wavelength control unit 312, generation wavelength control signal is used for, with triggering
Wavelength tunable laser source 310 is adjusted wavelength.
In one implementation, the wavelength adjustment of laser source 310 is carried out as unit of a small step delta.For example,
Assuming that total adjustment step number of the upstream wavelength between adjacent PON (such as PON1 and PON2) is M (M is greater than the integer equal to 1),
Then λ2u-λ1u=M*Δ。
Therefore, by using wavelength control signal appropriate, ONU300 according to the present invention can in different time-gap, with not
Data 304 between the upstream data 302 and ONU of co-wavelength transmission ONU300.In this way, the transmission of business is not required between ONU
The time slot of upstream data is robbed again.
Fig. 4 shows the time slot and wavelength of business between uplink service and ONU in the PON of an example according to the present invention
The schematic diagram of distribution.For business between PON, since the uplink/downlink wavelength of different PON is different, do not need as ONU
Between interaction carry out time slot allocation.
As shown in Figure 4, it is assumed that ONU1、......、ONUnBelonging to PON1, (its downlink and uplink wavelength is respectively λ1dWith
λ1u), the upstream data of these ONU constitute uplink frame (such as uplink frame 1, uplink frame 2 ...), wherein ONU1、......、
ONUnUpstream data respectively in time slot T1、......、TnIt sends, the time interval between two adjacent time-slots is referred to as to protect
Time GP, that is, GP=T2-T1=T3-T2=......=Tn-Tn-1。
The case where wavelength adjustment time τ that Fig. 4 particularly illustrates ONU300 is less than guard time GP.Wavelength adjustment time τ
It is the parameter of wavelength tunable laser source 310 (thus and ONU300), is determined by the characteristic in wavelength tunable laser source 310 itself.
ONU1、......、ONUnONU between data relative to time slot T1、……、TnUpstream data distinguish delay time
Data constitute frame between ONU (between such as ONU between frame 1, ONU frame 2 ...) between the ONU of Δ t, these ONU, wherein
ONU1、......、ONUnONU between data respectively in time slot T1+Δt、......、Tn+ Δ t is sent.It is appreciated that when delay
Between Δ t need to only meet not less than wavelength adjustment time τ.
In data between sending ONU, wavelength control unit 312 is triggered inclined to control the wavelength in wavelength tunable laser source 310
Several step deltas are moved to be modulated between data ONU.For example, being used for ONU1ONU between the wavelength of data can be λ1-int,
Then from ONU1Upstream data to ONU1ONU between data send wavelength adjustment step number be (λ1-int-λ1u)/Δ.
Wavelength for sending data between ONU (such as is respectively used to the λ of PON1, PON2, PON3, PON41-int、λ2-int、
λ3-int、λ4-int) it can be set to any wavelength between two neighboring upstream wavelength.
In one implementation, for sending the wavelength X of data between ONU1-int、λ2-int、λ3-int、λ4-intIt is configured to two phases
The centre of adjacent upstream wavelength.In this way, for from the wavelength for ONU transmitting uplink data to the wave transmitted for data ONU
Long wavelength adjustment (such as from λ1uTo λ1-int) for, wavelength adjustment step number be normal PON upstream wavelength adjustment (such as from
λ1uTo λ2u) total wavelength adjustment step number half.
It is appreciated that wavelength adjustment is also unnecessary if not having ONU interaction demand.
After carrying out above-mentioned adjustment to the wavelength of laser source 310 under the control of wavelength control unit 312, adjusted using having
The light of wavelength afterwards is modulated to emit interaction data ONU.Data composition is used between ONU from different ONU
Frame between the ONU of ONU interaction.Note that in this case, business can reuse the uplink service for carrying other ONU between ONU
Time slot (such as ONU1ONU between data can be with ONU2Upstream data in time slot T2Overlapping, as shown in Figure 4) because they
It is to be operated in different wave length.The adjustment of identical wavelength and ONU interaction data production method can be similar be applied to own
ONU。
Next, with wavelength X1-intIt has sent between ONU after interaction data (such as frame 1 between ONU), it can be in wavelength control
The wavelength of laser source 310 is adjusted into identical step number reversely return the wavelength of ONU300 under the action of the control signal of device 312 processed
Return to normal condition λ1u, to continue to send upstream data in uplink frame 2.The processing can repeat with carry out other uplinks and
Between ONU between the ONU of frame data generate and wavelength convert.
Fig. 5 shows the time slot and wave of business between uplink service and ONU in the PON of another example according to the present invention
The schematic diagram of long distribution.The case where wavelength adjustment time τ that Fig. 5 particularly illustrates ONU300 is greater than guard time GP.In Fig. 5
Shown, if wavelength adjustment time τ is greater than guard time, data service still need to only postpone one not less than wavelength between ONU
The time Δ t of adjustment time τ.It is then possible to be carried out between wavelength adjustment and ONU according to same way described in Fig. 4
Data modulation.In this case, data still can be overlapped in time with the upstream data of other ONU between ONU.For example,
In Fig. 5, data can reuse the ascending time slot T of ONU3 between the ONU of ONU13.Between ONU after data transmission, it can apply
Similar method carries out wavelength adjustment and normal upstream data modulation.
As can be seen from Figure 4 and Figure 5, regardless of wavelength adjustment time τ be greatly it is small, only need to set delay time Δ t to
It is wanted not less than wavelength adjustment time τ, and to the relationship between delay time Δ t and guard time GP is not also stringent
It asks.That is, the solution of the present invention is for the wavelength adjustment time τ of ONU, there is no limit any existing so as to be applied to
Or in the future occur the Wavelength tunable ONU with a variety of different wavelength adjustment time τ.Method pair proposed by the present invention
It is not strict in wavelength tuning speeds.
Fig. 6 shows an example of Wavelength Assignment scheme, wherein assuming upstream wavelength channels interval 100GHz.Each letter
The ONU interaction wavelength in road is set as being separated by 50GHz respectively with PON upstream wavelength.For example, λ1-intIt is arranged to from λ1uOffset
50GHz.Between each ONU when interaction starting, the wavelength in wavelength tunable laser source 310 is adjusted to λ1-int、λ2-int、λ3-int、λ4-int
In corresponding one, one in this reflection wavelength with sampling grating is consistent, therefore business will directly be reflected back it between ONU
He is ONU, it is no longer necessary to which complicated optical-electrical-optical conversion and the long range between OLT and ONU is propagated.
Fig. 3 is now turned back to, ONU300 is described from the angle of receiver below.
ONU300 as receiver includes optical circulator 314, for by data between the downlink data received and ONU with
Data separating between the upstream data and ONU to be sent.Specifically, the modulated uplink that wavelength tunable laser source 310 emits
Data 304 from the port of optical circulator 314 2 by exporting after optical circulator 314 between data 302 and ONU, and is sent to remote
Cheng Jiedian (such as remote node 230).Data (come between downlink data (coming from OLT210) from remote node 230 and ONU
Other ONU except ONU300) by being exported from the port of optical circulator 314 3 after optical circulator 314.
ONU300 further includes wavelength-division multiplex (WDM) filter 316, be used for will be located at different wave length band downlink data and
Data separating is to two branches 318 and 320 between ONU.Since interactive signal occupies different wavelength bands between downlink signal and ONU
(such as downlink signal occupies L+ wavelength band, and signal occupies C- wavelength band between ONU), therefore a thick WDM filtering can be used
Device 316 separates both signals.Here, for convenience, under data between the downlink data isolated and ONU being known as respectively
Data 320 between row data 318 and ONU.
In branch 318, ONU300 further includes optical filter 322, for filtering out downlink data 318.For example, light filters
It is λ that device 322, which can be a central wavelength,1dBandpass filter (BPF), can filter out wavelength be λ1dDownlink data
318。
In branch 320, ONU300 further includes adjustable optical filter 324, for filtering out data 320 between ONU.Example
Such as, optical filter 324 can be the adjustable bandpass filter of central wavelength (BPF), and central wavelength can be in λ1-int、
λ2-int、λ3-int、λ4-intBetween adjust, to filter out wavelength as λ1-int、λ2-int、λ3-intOr λ4-intONU between data 320.
Here, when wavelength phase between the ONU of the wavelength with ONU300 itself of data 320 between the ONU that optical filter 324 filters out
Meanwhile can determine data 320 between ONU be other ONU in same PON ONU between interaction data, i.e. interaction in PON
Data.And when wavelength difference between the ONU of the wavelength and ONU300 itself of data 320 between the ONU that optical filter 324 filters out,
Can determine data 320 between ONU be other ONU in different PON ONU between interaction data, i.e. interaction data between PON.
Next, data 320 are forwarded to respectively between the downlink data 318 filtered out of optical filter 322 and 324 and ONU
Corresponding downlink receiver 326 and ONU interaction receiver 328 are to be handled.
In this way, business between downlink business and ONU can be detected simultaneously in each ONU, and by adjusting
Tunable optical filter 324 can support any ONU interaction in PON or between PON.
It will be understood by those skilled in the art that can not also include WDM filter 316 in ONU300.In this case,
ONU300 does not separate roughly data between the downlink data and ONU received according to wavelength band, but is directly filtered by light
Device 322 and tunable optical filter 324 filter out data between downlink data and ONU according to wavelength.
Fig. 7 shows the schematic diagram of the structure of remote node 700 according to the present invention.Remote node 700 can for example be used
Make the remote node 230 in Fig. 2.
As shown in Figure 7, remote node 700 includes optical branching/combiner 710 and sampling grating 720.
Optical branching/combiner 710 is transferred to OLT for the upstream data from each ONU to be coupled to same root optical fiber
(such as OLT210), and the downlink data from OLT is assigned to all ONU.Optical branching/combiner 710 in the present invention with
Traditional optical branching/combiner is identical, therefore repeats no more herein.
Sampling grating 720 is specifically designed tool there are four reflected channel, the wavelength of these reflected channels respectively with it is each
Interaction wavelength (λ between ONU1-int、λ2-int、λ3-int、λ4-int) alignment.
In one implementation, sampling grating 720 includes sampled fiber Bragg grating (SFBG).
Using the specially designed SFBG720, at remote node 700, downlink and uplink wavelength (λ1d、λ2d、λ3d、λ4dWith
λ1u、λ2u、λ3u、λ4u) can directly be sent by SFBG720, and interaction wavelength (λ between ONU1-int、λ2-int、λ3-int、λ4-int) will
It is reflected and is broadcast to all ONU.
The full light of ONU of high speed low latency is realized in TWDM-PON invention proposes a kind of novel method and apparatus
Interaction.Compared with scheme in the prior art, main advantages of the present invention are:
1, inexpensive: to be transmitted not with signal between uplink and ONU is respectively used to using two ONU laser sources in the prior art
Together, in the present invention, only with one, necessary, Wavelength tunable ONU laser source is modulated respectively in TWDM-PON in ONU
Interactive signal between uplink signal and ONU, to be greatly saved ONU cost and provide advanced interactive function.
2, bandwidth efficiency is high: with traditional by increasing the time interval between two adjacent ONU uplink services for ONU
Between the scheme (upstream bandwidth efficiency can be greatly reduced in this scheme) that is loaded into uplink service of business it is different, in the present invention
In, the time slot allocation of ONU uplink service is not influenced by interacting.The time slot of upstream PON signals is not robbed in data service between ONU,
Because both business are transmitted in different wavelength channels, this is that adjustable wavelength laser is supported.In the time domain,
Data even can be Chong Die with the uplink service of other ONU between ONU, therefore bandwidth efficiency can be greatly improved, such as than tradition
Method almost doubles.
3, complicated optical-electronic conversion and electronics low latency: are carried out with OLT is sent by business between ONU in conventional method
Signal processing is different, and in the present invention, remote node is using compact sampling FBG (SFBG) come with low-down cost and low
The effective full light ONU interaction in TWDM-PON framework is realized in delay.Interactive service can be by SFBG in a frequency domain from upper between ONU
It is easily extracted in industry business, therefore does not need complicated electrical-optical conversion and Domain Synchronous to distinguish both types
Business.Also, the workload and power consumption of OLT can be reduced greatly.For the distribution link 5km between ONU and remote node
The case where for, ONU interaction delay can be down to 50us.
4, it arbitrary ONU interaction: using ONU structure designed by the present invention, can be realized by selecting appropriate wavelength
Full light ONU interaction between any ONU including being communicated between PON in PON.
5, it improves power system capacity: can support all interactions sent from different ONU with different wave length in system simultaneously
Data service, therefore the power system capacity and network efficiency of interaction greatly enhance between ONU.
In view of these benefits, interaction between ONU of the proposed technology for realizing high speed low latency in TWDM-PON
For be a kind of very attractive solution, can wirelessly converge in access net in following light as between baseband pool
A kind of solution got a good chance of of X2 interface.
Above to the present invention have been described in detail by taking the TWDM-PON as made of 4 TDM-PON stackings as an example, however this
The range of invention is not limited thereto, but can be applied to arbitrarily be comprising multiple PON with different uplink/downlink wavelength
Interaction between ONU is realized in system.
In one or more exemplary designs, this can be realized with hardware, software, firmware or their any combination
The application function.If realized with software, can be stored the function as one or more instruction or code
On a computer-readable medium, or as on computer-readable medium one or more instructions or code transmit.It calculates
Machine readable medium includes computer storage media and communication media, and wherein communication media includes facilitating computer program from one
Place is transmitted to the arbitrary medium of another place.Storage medium can be general or specialized computer-accessible any available
Medium.This computer-readable medium may include, such as, but not limited to, RAM, ROM, EEPROM, CD-ROM or other CDs
Store equipment, disk storage equipment or other magnetic storage apparatus, either can be used for general or specialized computer or it is general or
The form of the addressable instruction of application specific processor or data structure come code modules desired by carrying or store it is any its
Its medium.Also, it is any to connect the computer-readable medium that be known as.For example, if software be using coaxial cable,
The wireless technology of optical fiber cable, twisted pair, Digital Subscriber Line (DSL) or such as infrared ray, radio and microwave etc is come from net
It stands, server or other remote sources transmission, then coaxial cable, optical fiber cable, twisted pair, DSL or such as infrared ray, wireless
The wireless technology of electricity and microwave etc is also included in the definition of medium.
General processor, digital signal processor (DSP), specific integrated circuit (ASIC), field programmable gate can be used
Array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components or for executing sheet
Any combination of function described in text come realize or execute combine the disclosure described in various illustrative logical blocks, module and
Circuit.General processor can be microprocessor, alternatively, processor is also possible to any conventional processor, controller, micro-control
Device or state machine processed.Processor also can be implemented as calculating the combination of equipment, for example, the combination of DSP and microprocessor, multiple
The combination or any other such structure of microprocessor, one or more microprocessors and DSP core.
Those of ordinary skill in the art should also understand that, the various illustrative logics described in conjunction with embodiments herein
The combination of electronic hardware, computer software or both may be implemented into block, module, circuit and algorithm steps.In order to understand earth's surface
Show this interchangeability between hardware and software, various illustrative components, block, module, circuit and step are enclosed above
General description has been carried out around its function.Hardware is implemented as this function and is also implemented as software, is depended on specific
Using and apply design constraint over the whole system.Those skilled in the art can be directed to every kind of specific application, to become
Logical mode realizes described function, and still, this realization decision should not be interpreted as causing a departure from the scope of this disclosure.
The above description of the disclosure is for can be realized any those of ordinary skill of this field or using the present invention.It is right
For those of ordinary skill in the art, the various modifications of the disclosure be will be apparent from, and generality defined herein
Principle can also be applied to other deformations in the case where without deviating from the spirit and scope of the disclosed invention.Therefore, the present invention is simultaneously
It is not limited to example and design as described herein, but it is consistent with the widest scope of principle disclosed herein and novel features.
Claims (13)
1. a kind of ONU transmitting for supporting interaction between optical network unit (ONU) in the system comprising multiple passive optical network (PON)
Machine, wherein the multiple PON is respectively provided with corresponding uplink/downlink wavelength, the ONU transmitter includes:
Delay line is configured as postponing data the ONU to be sent relative to the upstream data to be sent, wherein
Data refer to the data that other ONU are sent to by the ONU between ONU, and upstream data, which refers to, to be sent to light by the ONU
The data of road terminal (OLT)；
Combiner is configured as data between the ONU after the upstream data and delay being combined；
Wavelength tunable laser source is configured as generating the optical signal of different wave length to from the received upper line number of the combiner
According between ONU data be modulated respectively.
2. ONU transmitter as described in claim 1, further includes:
Wavelength control unit is configured as generation wavelength control signal, is carried out with triggering the wavelength tunable laser source to wavelength
Adjustment.
3. ONU transmitter as described in claim 1, wherein the wavelength adjustment in the wavelength tunable laser source is small with one
Step-length is what unit carried out.
4. ONU transmitter as described in claim 1, wherein the wavelength tunable laser source is for sending data between the ONU
Wavelength be arranged to any wavelength between two neighboring upstream wavelength.
5. ONU transmitter as described in claim 1, wherein the wavelength tunable laser source is for sending data between the ONU
Wavelength be arranged on the centres of two neighboring upstream wavelength.
6. ONU transmitter as described in claim 1, wherein wavelength tunable laser source data between having sent the ONU
Later, wavelength is reversely adjusted to the upstream wavelength for returning to and being used for upstream data transmission.
7. a kind of ONU for supporting interaction between optical network unit (ONU) in the system comprising multiple passive optical network (PON) is received
Machine, wherein the multiple PON is respectively provided with corresponding uplink/downlink wavelength, the ONU receiver includes:
Optical circulator is configured as data between the downlink data that will be received and ONU and separates with the data to be sent,
Middle downlink data refers to that from data between optical line terminal (OLT) received data, ONU be the data from other ONU, under described
Data are sent with different wave length, in different time-gap between row data and the ONU；
First optical filter is configured as filtering out the downlink data according to wavelength；And
Second tunable optical filter is configured as filtering out data between the ONU according to wavelength.
8. ONU receiver as claimed in claim 7, wherein second tunable optical filter is that a central wavelength is adjustable
Bandpass filter, central wavelength are corresponding with the respective wavelength in the multiple PON for data transmission between ONU respectively.
9. ONU receiver as claimed in claim 7, further includes:
Wavelength-division multiplex (WDM) filter is arranged in front of first optical filter and second tunable optical filter, is used
The downlink data and described is separated in the difference according to the wavelength band that data are located between the downlink data and the ONU
Data between ONU.
10. a kind of long-range section for supporting interaction between optical network unit (ONU) in the system comprising multiple passive optical network (PON)
Point, wherein the multiple PON is respectively provided with corresponding uplink/downlink wavelength, the remote node includes:
Sampling grating, with multiple reflected channels, the wavelength of the reflected channel is handed between the ONU of the multiple PON respectively
Mutual wavelength alignment,
Wherein, the upstream data of each ONU in the multiple PON is forwarded to optical line terminal by the sampling grating
(OLT), data between the ONU from each ONU are reflected and are broadcast to all ONU in the system.
11. remote node as claimed in claim 10, further includes:
Optical branching/combiner, be configured as by from the upstream data of each ONU be coupled to same root optical fiber for transmission to
OLT, and the downlink data from OLT is assigned to all ONU.
12. a kind of ONU for supporting interaction between optical network unit (ONU) in the system comprising multiple passive optical network (PON), packet
It includes such as ONU transmitter of any of claims 1-6 and ONU receiver as claimed in any one of claims 7-9.
13. a kind of support system interactive, comprising multiple passive optical network (PON) between optical network unit (ONU), including as weighed
Benefit requires ONU transmitter described in any one of 1-6, ONU receiver as claimed in any one of claims 7-9 and as weighed
Benefit requires remote node described in any one of 10-11.
Priority Applications (3)
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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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| CN201310429658.XA CN104469562B (en) | 2013-09-18 | 2013-09-18 | The ONU and remote node of interaction between support ONU |
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| CN104967477B (en) * | 2015-06-26 | 2018-03-13 | 南京邮电大学 | Optical-fiber network intelligence P circle guard methods based on multicast service |
| CN106412726B (en) * | 2015-07-28 | 2020-12-11 | 上海诺基亚贝尔股份有限公司 | Method and device for supporting communication between base stations in PON system |
| CN106686474B (en) * | 2015-11-10 | 2019-10-22 | 中国电信股份有限公司 | A kind of wavelength tuning method of passive optical network, system and ONU |
| CN105763284A (en) * | 2016-04-01 | 2016-07-13 | 北京邮电大学 | Four-wave mixing-based TWDM-PON (Time and Wavelength Division Multiplexing-Passive Optical Network) local interconnection method |
| EP3550739B1 (en) * | 2016-12-24 | 2021-06-30 | Huawei Technologies Co., Ltd. | Data communication system, optical line terminal, and baseband unit |
| TWI622275B (en) * | 2017-08-03 | 2018-04-21 | Chunghwa Telecom Co Ltd | Adjustable laser light wavelength automatic adjusting device and method thereof |
| CN114128231A (en) * | 2019-09-13 | 2022-03-01 | 华为技术有限公司 | Adaptive in-band network telemetry for full network coverage |
| CN111211842A (en) * | 2019-12-27 | 2020-05-29 | 京信通信系统（中国）有限公司 | Wavelength division multiplexing data transmission method, device, equipment and storage medium |
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| WO2015040484A3 (en) | 2015-06-11 |
| WO2015040484A2 (en) | 2015-03-26 |
| CN104469562A (en) | 2015-03-25 |
| TW201513586A (en) | 2015-04-01 |
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