CN104218997B - Optical network unit and optical link terminal - Google Patents
Optical network unit and optical link terminal Download PDFInfo
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- CN104218997B CN104218997B CN201310210219.XA CN201310210219A CN104218997B CN 104218997 B CN104218997 B CN 104218997B CN 201310210219 A CN201310210219 A CN 201310210219A CN 104218997 B CN104218997 B CN 104218997B
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Abstract
In order to provide a method for all-optical ONU mutual communication with a low cost, the present invention provides an optical network unit and an optical link terminal. The optical network unit includes: a generating portion, for generating an upward optical signal, which includes upward data modulated at a first communication wavelength and multiplexed by means of time division and first mutual communication information between the optical network units; and an output interface, for sending the upward optical signal to the optical link terminal. The optical link terminal includes: an input interface, for receiving the upward optical signal from the optical network unit; a shift switch, for respectively shifting the upward optical signal of the upward data and the optical signal of the mutual communication information by means of time division to an uplink receiver and a communication processing unit; the uplink receiver, for detecting the upward optical signal of the upward data to obtain the upward data; and the communication processing unit, for sending the optical signal of the mutual communication information to a corresponding optical network unit.
Description
Technical field
The present invention relates to optical-fiber network, more particularly, to EPON.
Background technology
With advanced multimedia extensive application, such as 3D TV, Telemedicine, game on line, interdynamic video electricity
The exploitation of the applications such as son study, has huge growth to the demand of bandwidth.PON2 (NG-PON2) of future generation is as Long Term Evolution
PON solution it is intended to improve multi-plexing light accessing system ability preferably to support these bandwidth applications, it is just as a heat
Point subject under discussion, by portion of international telecommunication union telecommunication (ITU-T) and FSAN (Full Service Access Network,
Abbreviation FSAN) tissue discussed.Most operator wishes that NG-PON2 can provide bigger bandwidth, higher splitting ratio
(more than 1: 64), longer transmission range and more preferable access capability.At present, ITU-T and FSAN is finally determining NG-
The demand of PON2, available bandwidth is increased to 40Gb/s speed.
In the technical scheme having been proposed that, TWDM-PON is considered as to NG-PON2 by nearest FSAN meeting
Primary solutions, wherein, 4 10G-PON (XG-PON) are stacked and have 1: 64 splitting ratio, and this can obtain
Obtain the convergence speed of down direction 40Gbps and up direction 10GGbps.In single wavelength, TWDM-PON has reused XG-PON
Descending multiplexing and multi-upstream access technology, time slot granularity, multicast capability and Bandwidth sharing mechanism.
Current TWDM-PON system architecture is that optical line terminal (OLT) is connected to remote node (RN) by optical fiber, far
Cheng Jiedian is connected to optical network unit (ONU) by optical fiber again.
In TWDM-PON system, often need to carry out being in communication with each other between ONU.In current system, this is mutual
The communication information is modulated on optical signal by ONU, is sent to OLT by up direction, stands light-to-current inversion at OLT, is formed
Electric signal.This electric signal is buffered and scheduled then, is then modulated on certain wavelength, under suitable time slot passes through again
Related ONU is sent on line direction.It can be seen that, due to needing to carry out the operation such as optical-electrical-optical conversion, caching, scheduling, this technical side
Case creates larger communication delay.And, the load of OLT also can be remarkably increased because of the operation such as light-to-current inversion, caching,
Have impact on the performance of system.Below in these scenes, these postpone especially sensitive：
In LTE-A mobile retransmission (backhaul) network based on PON technology, base station (eNodeB) wishes to pass through logic
X2 interface, it is in communication with each other with the speed of the delay less than 1 millisecond and Gb/s rank and other base stations, thus carrying out collaborative many
The related operation of antenna, for example, precoding across base band carries out data exchange, etc..But, in existing TWDM-PON knot
In structure, the interconnection between base station be based on ONU between be in communication with each other realization, due to due to aforementioned, this is in communication with each other and is subject to
The delayed impact that optical-electrical-optical conversion, caching etc. lead to.This delay can not meet strict in LTE-A network end-to-end prolong
Demand late.
In addition, TWDM-PON network needs splitting ratio no less than 1: 64 and it needs to distance (long reach) function,
This means to need to dispose more ONU, thus can there are more ONU intercommunications, what therefore ONU was in communication with each other always prolongs
Also can increase late, this has negative impact to the application of the delay sensitives such as game on line, video conference.
Content of the invention
There is in the industry several methods realizing the intercommunication of ONU in TDM-PON and TWDM-PON, their skill
Art main points and shortcoming are listed below：
1. send ONU and be in communication with each other using special emitter and wavelength on ONU.The shortcoming of this implementation
It is to need to take extra wavelength, and be also required to newly-increased extra light source etc., thus increased the cost of ONU；
2., in optical distributed network (ODN), optical route reflection is carried out to being in communication with each other between ONU.For example, exist
Remote node (RN) in ODN is upper to arrange the star-type coupler of 2Nx2N or the loopback array waveguide grating (AWG) of multiport.This
Kind of implementation the disadvantage is that, needing RN is modified, and operator is generally not desirable to change already disposed remote
Cheng Jiedian.
The business in ODN, ONU being in communication with each other carries out route reflection, and this also has one disadvantage in that：These communications cannot be by
OLT is controlled, and this can lead to operator effectively cannot directly control this to be in communication with each other, for example, cannot count flow, meter
Take etc..Accordingly, it is desirable to be able to realize the controlled ONU of OLT to be in communication with each other mechanism.
In order to solve above technical problem if it is possible to provide a kind of full light of ONU of low cost to be in communication with each other technology, and
This communication can be controlled by OLT, then will be advantageous to improve the performance of PON.
At least in part from the above considerations, the inventive concept of the present invention is, by being in communication with each other between ONU and ONU-
The upstream data of OLT is sequentially multiplexed together, and is transmitted by communication wavelengths (i.e. upstream wavelength).And at OLT end, at that time
Divide ground that the information that is in communication with each other and upstream data are demultiplexed, the optical signal of upstream data is detected, and is in communication with each other
Optical signal is reflected to corresponding ONU.
The more preferred inventive point of the present invention can be listed below：
1., in ONU end, by an electric combiner, the information that upstream data and ONU are in communication with each other is with a time delay
For interval, merge into an information flow.This information flow is directly used in and controls the tunable laser with certain communication wavelengths, to produce
The upstream data being multiplexed in a time division manner and the mixing uplink optical signal being in communication with each other are modulated.This upstream data and being in communication with each other
Shared this communication wavelengths (upstream wavelength).
2. at OLT end, using an automatically controlled photoswitch, according to above time delay by time-multiplexed upstream data and
The optical signal that ONU is in communication with each other is demultiplexed.
3. the optical signal of demultiplexing upstream data out is sent to uplink receiver and carries out normally up detection.
4. the optical signal that demultiplexing ONU out is in communication with each other passes through array waveguide grating, and similarly demultiplexes out
, the optical signal being in communication with each other that other ONU send in other communication wavelengths carry out wavelength-division multiplex again.Then pass through single light
Fibre uniformly returns to all ONU again.
5. at ONU, in order to receive being in communication with each other from other ONU, ONU has an adjustable wave filter, to select
Select the communication wavelengths that its ONU to be received is in communication with each other place.Can support that between PON, (ONU belongs to different upstream wavelengths
(communication wavelengths) group) ONU be in communication with each other that (ONU belongs to same upstream wavelength it is also possible to support the ONU in PON to be in communication with each other
(communication wavelengths) group).
Based on above inventive concept and inventive point, one aspect of the present invention provides a kind of optical network unit, including such as
Lower component：Generating portion, for generating uplink optical signal, this uplink optical signal include being modulated to the first communication wavelengths, with
Between the upstream data of time division way multiplexing and optical network unit first is in communication with each other information；And output interface, for by this
Traveling optical signal is sent to optical line terminal.
Correspondingly, another aspect of the present invention provides a kind of optical line terminal, including such as lower component：Input interface,
For receiving the uplink optical signal from optical network unit, wherein, this uplink optical signal includes being modulated to certain communication wavelengths
, be in communication with each other information between the upstream data merging in a time division manner and optical network unit；Switching switch, for time-division side
The uplink optical signal of this upstream data is switched to uplink receiver and communication with the optical signal that this is in communication with each other information by formula respectively
Processing unit；Uplink receiver, for detecting the uplink optical signal of this upstream data, obtains this upstream data；Communication process list
Unit, the optical signal for this is in communication with each other information is sent to corresponding optical network unit.
The advantage of the above is：
First, ONU can carry out being in communication with each other of full light with higher speed and relatively low delay；Do not need at OLT end
Carry out the conversion of optical-electrical-optical and the caching of complexity, reduce the load of OLT, improve network efficiency.
Secondly, upstream data and be in communication with each other shared identical upstream wavelength, significantly reduces ONU wavelength and takies.
And it is not necessary to be modified to optical distributed network (ODN), for example, remote node (RN) can be maintained constant.
According to one preferred embodiment, described generating portion includes：Combining unit, for by upstream data and this
One is in communication with each other information was merged in the way of the time-division；And tunable laser, by this upstream data merging in a time division manner and should
First is in communication with each other information is driven, by this upstream data and this first be in communication with each other modulates information in this first communication wavelengths,
Form this uplink optical signal.
This embodiment offers a more specific implementation realizing generating portion.In this embodiment, on
Row data and this first be in communication with each other information and can merge into bit stream on electric level, and then again tunable laser is carried out
Control, easily create time-multiplexed optical signal, have shared tunable laser, cost is very low.
According to one preferred embodiment, this optical network unit is also included as lower component：Input interface, for receiving
From the downlink optical signal of this optical line terminal, wherein, sent containing other optical network units in this downlink optical signal, modulation
In between the optical network unit of the second communication wavelengths second is in communication with each other information；First tunable optical filter, for second leading to this
The optical signal of letter wavelength leaches from this downlink optical signal being received；Communication control processor, for this second communication wavelengths
Optical signal is detected, obtains this and second is in communication with each other information.
This embodiment offers the scheme receiving this in ONU and being in communication with each other.
In one embodiment, this first communication wavelengths is identical with this second communication wavelengths, that is, this optical network unit with
Other at least one optical network units share this first communication wavelengths.And, this first time slot used by this optical network unit with should
Each time slot used by other at least one optical network units of second time slot and this distinguishes in a time division manner.
In TWDM-PON framework, there is the ONU group constituting using multiple ONU of phase co-wavelength.Present embodiment is with regard to energy
Enough support that the ONU (ONU belongs to same upstream wavelength (communication wavelengths) group) in ONU group carries out (Intra-PON) in PON mutual
Communication.
In one embodiment, this first communication wavelengths is different from this second communication wavelengths.Present embodiment can be propped up
Hold ONU and belong to different upstream wavelength (communication wavelengths) groups) ONU be in communication with each other it is achieved that (Inter-PON) phase between PON
Mutual communication.
According to a further embodiment, also contain in this downlink optical signal that this input interface is received and be modulated to
Downlink data in certain downstream wavelength；This optical network unit is also included as lower component：Wavelength-division multiplex unit, for certain by this
The optical signal of downstream wavelength is separated with the optical signal of this second communication wavelengths；Second tunable optical filter, for necessarily descending by this
The optical signal of wavelength leaches；Downlink receiver, for carrying out descending detection to the optical signal of this certain downstream wavelength, obtains under this
Row data.
In this embodiment, downlink data can be together with wavelength-division multiplex with the information that is in communication with each other returning ONU, and ONU has
There is corresponding device to demultiplex them to receive respectively, only can be communicated using simple optical fiber.
According to a further embodiment, this optical network unit and other at least one optical network units share this
One communication wavelengths, and this first time slot used by this optical network unit and this second time slot and this other at least one optical-fiber network list
Each time slot used by unit distinguishes in a time division manner.
In TWDM-PON framework, there is the ONU group constituting using multiple ONU of phase co-wavelength.This embodiment allows
Each ONU in ONU group carrys out sequentially to send upstream data in a time division manner and is in communication with each other information, there is provided in ONU group
Multiple ONU more preferable support.
According to a further embodiment, this optical network unit also includes：Control unit, is derived from this light for receiving
The schedule information of line terminal, this schedule information indicate send this upstream data and this first be in communication with each other information place when
Gap, and receive this downlink data and this second be in communication with each other information place time slot.
Correspondingly, in optical line terminal, including：Main control unit, sends scheduling for determining and to each optical network unit
Information, this schedule information indicates the time slot that each optical network unit sends this upstream data and is in communication with each other information place, and
Receive this and be in communication with each other the time slot that information is located.
In this embodiment, optical network unit can be controlled by optical line terminal, therefore has very strong flexibility, and
And also there is more preferable configurability.
According to a further embodiment, this control unit is additionally operable to：Send demand signalling to this optical line terminal,
The request of this demand signalling is communicated with other optical network units, and for receiving the confirmation message from this optical line terminal；
After receiving this confirmation message, this combining unit is operated；And be used for：Receive forwarded by this optical line terminal, be derived from
The demand signalling of other optical network units, this demand signalling asks other optical network units of this optical network unit and this to be led to
Letter；Determine whether to be communicated with this other optical network unit, after determination is communicated, send to this optical line terminal and confirm
Message；After determining communication, described first tunable optical filter and described communication control processor are operated.
Correspondingly, in optical line terminal, this main control unit is additionally operable to：Receive the demand signalling from optical network unit,
This demand signalling asks other optical network units to be communicated with this optical network unit；This demand signalling is transmitted to this other light
NE；Receive the confirmation message from this other optical network unit；This confirmation message is forwarded back to this optical network unit.
This embodiment offers for consulting the signaling procedure starting to be in communication with each other between ONU, and provide OLT pair
This signaling carries out the technical scheme of transfer.This embodiment is perfect to carry out the control flow that full light ONU is in communication with each other.
In terms of optical line terminal, this input interface of optical line terminal is used for receiving being somebody's turn to do from different optical network units
Uplink optical signal, wherein, the uplink optical signal using same communication wavelength is sent by different optical network units in a time division manner, should
Optical line terminal includes multigroup switching switch and the uplink receiver corresponding respectively to different communication wavelength, and this optical line terminal is also
Including：First array waveguide grating, for demultiplexing the uplink optical signal of this different communication wavelength and being respectively supplied to corresponding
Switching switch；This communications processor element also includes：Second array waveguide grating, is connected with each switching switch, respectively for inciting somebody to action
The optical signal being in communication with each other information on different communication wavelength is multiplexed together to be sent to each optical network unit.
In this embodiment, optical line terminal supports that multiple optical network units are sent using different communication wavelength respectively
It is in communication with each other, support being in communication with each other between the ONU of wavelength-division multiplex, improve the message capacity being in communication with each other.
In a further embodiment, this optical line terminal is also included as lower component：Downstream transmitter, is used for carrying
For in certain downstream wavelength, to have modulated downlink data optical signal；Wavelength-division multiplex unit, is coupled to this downstream transmitter and is somebody's turn to do
Second array waveguide grating, for by modulated on the optical signal of downlink data and different communication wavelength, modulated phase intercommunication
The optical signal of letter information is multiplexed with downlink optical signal, to be sent to each optical network unit.
In this embodiment, downlink data can wavelength-division ground together with being in communication with each other information multiplexing, improve communication
Capacity.
Brief description
By reading the detailed description that non-limiting example is made made with reference to the following drawings, other of the present invention
Feature, objects and advantages will become more apparent：
Fig. 1 gives the structure chart of the ONU according to an embodiment of the invention；
Fig. 2 gives according to an embodiment of the invention, multiple ONU sharing same communication wavelengths upper line numbers
According to the time slot distribution schematic diagram being multiplexed in a time division manner with ONU intercommunication information；
Fig. 3 gives the structure chart of the OLT according to an embodiment of the invention, and the schematic diagram of optical-fiber network.
Specific embodiment
One aspect of the present invention provides a kind of optical network unit, including such as lower component：Generating portion, for generating
Traveling optical signal, this uplink optical signal includes upstream data being modulated to the first communication wavelengths, being multiplexed in a time division manner and light
Between NE first is in communication with each other information；And output interface, for this uplink optical signal is sent to optical line terminal.
In one preferred embodiment, as shown in figure 1, this generating portion includes：
- combining unit, for by upstream data and this first be in communication with each other information and merged in the way of the time-division；
- tunable laser, is in communication with each other information by this upstream data merging in a time division manner and first and is driven, should
Upstream data and this first be in communication with each other modulates information in this first communication wavelengths, form this uplink optical signal.
More specific, this upstream data is placed on the first time slot T by combining uniti, this first is in communication with each other information
It is positioned over this first time slot TiThe second time slot after given delay t.As shown in figure 1, this optical network unit can have one prolonging
Late unit, it is supplied to combining unit be in communication with each other the frame delay t of information by first after.Combining unit by the frame of upstream data with
First frame being in communication with each other information is synthesized together as information flow/bit stream, is available to tunable laser and is modulated.
It is known in the art for being produced the tunable laser of optical signal by bit flow control, such as DFB etc. is each
Plant laser instrument to may be used to realize this function.It is in the first communication wavelengths λ '1Upstream data and the first phase have been modulated in upper generation
The optical signal of intercommunication letter information, the optical signal of the upstream data as shown in ONU-1UL in Fig. 2 and ONU-1 are in communication with each other shown
It is in communication with each other shown in the optical signal of information.
Under the network structure of TWDM-PON, in order to improve the durability of network, PON can middle exist by several ONU institutes
The group of composition, the ONU in this group shares identical upstream wavelength.For example as right side dotted line institute frame in Fig. 3, in ONU group 1
ONU1-n shares upstream wavelength λ '1；ONU1-n in ONU group 2 shares upstream wavelength λ '3；Also include two single ONU respectively
Take upstream wavelength λ '2With λ '4.In this case, in order to avoid conflict, for certain ONU group, the ONU in this group sends
Uplink optical signal distinguishes in a time division manner, i.e. this first time slot T used by optical network unit in this groupiWith this second time slot
TiThe each time slot used by other optical network units in+t and this group distinguishes in a time division manner.For example, as shown in Figure 2,
The optical signal of the respective upstream data of ONU1, ONU2 and ONU3 and be in communication with each other the optical signal of information and be multiplexed in a time division manner upper
Traveling wave length (communication wavelengths) λ '1On.
Preferably, in one embodiment, this ONU also includes control unit, is derived from this optical line terminal for receiving
The schedule information of OLT, this schedule information indicate send this upstream data and this first be in communication with each other information place time slot.Phase
Ying Di, OLT include a main control unit, and this main control unit is used for determining and sends schedule information to each optical network unit, should
Schedule information indicates the time slot that each optical network unit sends this upstream data and is in communication with each other information place.This schedule information can
To be carried by control signaling between OLT and ONU.One of ordinary skill in the art can be to the content of existing control signaling
Adjust accordingly to accommodate this schedule information, or define new control signaling and be exclusively used in sending this schedule information, the present invention
No longer specifically repeat.It is appreciated that receive the ONU that this is in communication with each other information should be in (or slight delay identical with sending time slots
Received on reception time slot a bit), the main control unit of this optical line terminal is also by this reception time slot notification receiving terminal light net
The control unit of network unit.
Continue as shown in figure 1, the multiplexing of tunable laser output is in λ '1On upstream data and be in communication with each other the light of information
Signal, after loopback device, is exported by output interface.This output interface can include WDM (wavelength-division multiplex) part of in figure.
Go to Fig. 3, each communication wavelengths λ ' that each ONU is sent1、λ′2、λ′3With λ '4Multiplexed signals reached by optical fiber
To remote node RN.This remote node RN includes luminous-power distributor, and the optical signal wavelength-division of each communication wavelengths is multiplexed by it
Together, and by optical fiber it is then forwarded to optical line terminal OLT.Remote in this remote node and existing optical distributed network (ODN)
Cheng Jiedian indifference, therefore avoid and existing ODN are modified, and have very wide applicability.
Included as lower component according to a kind of optical line terminal of the present invention：
- input interface, for receive from optical network unit uplink optical signal, wherein, this uplink optical signal include by
It is in communication with each other information between upstream data being modulated to certain communication wavelengths, merging in a time division manner and optical network unit；
- switching switch, in a time division manner by the uplink optical signal of this upstream data and this be in communication with each other the light of information
Signal switches to uplink receiver and communications processor element respectively；
- uplink receiver, for detecting the uplink optical signal of this upstream data, obtains this upstream data；
- communications processor element, the optical signal for this is in communication with each other information is sent to corresponding optical network unit.
Specifically, as shown in figure 3, this input interface can be the WDM part of in figure, it receive from remote node,
Each communication wavelengths λ ' of wavelength-division multiplex1、λ′2、λ′3With λ '4Multiplexed signals, this multiplexed signals includes the up of each ONU
Data and ONU are in communication with each other information.
For each communication wavelengths λ '1、λ′2、λ′3With λ '4Signal separator, will be as shown in figure 3, this multiplexed signals passes through
Loopback device reaches the first array waveguide grating AWG1, and it is used for this different communication wavelength X '1、λ′2、λ′3With λ '4Up light
Signal separator.
As shown in figure 3, this optical line terminal includes corresponding respectively to different communication wavelength X '1、λ′2、λ′3With λ '4Multigroup
Switching switch and uplink receiver.The e.g. automatically controlled photoswitch of this switching switch (or claiming electrooptical switching, E/O switch).Should
Switching switch exports the optical signal of upstream data to uplink receiver in the time slot of corresponding upstream data, and in ONU phase intercommunication
The optical signal being in communication with each other is supplied to communications processor element by the time slot of letter information.It is appreciated that the time slot of this upstream data and
The time slot that ONU is in communication with each other information is distributed by OLT, and therefore OLT knows these time slots.
Each uplink receiver Rx1-4 of corresponding different wave length carries out optical signal detecting respectively, obtains upstream data.
This communications processor element includes the second array waveguide grating AWG2 and WDM part.Different communication wavelength X '1、λ′2、
λ′3With λ '4On the optical signal being in communication with each other information pass through this second array waveguide grating AWG2 again by wavelength-division multiplex together.
Meanwhile, in order to realize downlink communication, optical line terminal also includes multiple downstream transmitter Tx1-4, uses respectively
In certain downstream wavelength λ of offer1、λ2、λ3And λ4On, the optical signal of having modulated downlink data.Optical line terminal also includes the 3rd
Array waveguide grating AWG3, is coupled to each downstream transmitter, for by the optical signal wavelength-division multiplex of different downstream wavelength together,
To be supplied to this WDM part.
This WDM part is by the different communication wavelength X ' of wavelength-division multiplex1、λ′2、λ′3With λ '4On the light being in communication with each other information
Signal, and different downstream wavelength λ of wavelength-division multiplex1、λ2、λ3And λ4On downstream signal carry out wavelength-division multiplex, obtain descending
Optical signal, this downlink optical signal is sent back remote node by simple optical fiber.
This downlink optical signal is distributed to all connected optical network unit ONU by the power divider of remote node.
Return to Fig. 1, the WDM part of ONU receives this optical signal as input interface, and this optical signal is provided by respectively
The receiving portion being in communication with each other to downlink data receiving portion and ONU.
As shown in fig. 1, downlink data receiving portion includes the second tunable filter and downlink receiver.This optical signals
Second tunable filter is filtered, and the operation wavelength of this wave filter is adjusted to the wavelength that downlink data to be received is located,
Such as λ1On.So except λ1Outside wavelength, downlink data on other wavelength and be in communication with each other the optical signal of information and all filtered
Remove.Downlink receiver is to this certain downstream wavelength λ1Optical signal carry out descending detection, obtain this downlink data.
As shown in fig. 1, the receiving portion that ONU is in communication with each other includes the first tunable filter and communication control processor.Through ring
The downlink optical signal that road device provides passes through the first tunable filter, and the operation wavelength of this wave filter is adjusted to phase to be received
The communication wavelengths that intercommunication letter information is located, then in addition to this wavelength, the downlink data of wavelength-division multiplex and other communication wavelengths
On the optical signal being in communication with each other information be all filtered out.Communication control processor carries out descending detection to the optical signal of this communication wavelengths,
Obtain this downlink data.As it was previously stated, the reception time slot of reality is notified the control list of this ONU by the main control unit of optical line terminal
Unit.
By adjusting the operation wavelength of the first tunable filter, ONU can receive and be in communication with each other letter from different ONU
Breath.
Specifically, in one embodiment, for certain ONU group, its certain internal ONU can receive in same group
Other ONU are in communication with each other information with what identical communication wavelengths sent, as long as the first tunable filter is adjusted to this communication
Wavelength.For example, as shown in Fig. 2 ONU1 is in T1+ t time slot have sent the information that is in communication with each other of ONU, during this time, ONU
The emitting portion of the ONU2 in group 1 does not work, and its first tunable filter is adjusted to λ '1Wavelength, to receive ONU1 transmission
ONU is in communication with each other information.As shown in figure 3, this achieves the communication of (intra-PON) PON Nei
In an alternative embodiment, the optical network unit that transmission is in communication with each other information is the ONU2 in ONU group 1.
As shown in Fig. 2 it is in T2+ t time slot is transmitted.In synchronization, belong to another communication wavelengths λ '2ONU can it
First tunable filter is adjusted to λ '1Wavelength, reception is in communication with each other information from the ONU2's making in ONU group 1.As shown in figure 3,
This achieves the communication of (inter-PON) between PON.Meanwhile, this belongs to another communication wavelengths λ '2ONU emission part
Dividing can also be in wavelength X '2Upper freely send its upstream data and be in communication with each other information, λ ' will not be subject to1The impact of wavelength.
In one preferred embodiment, before being in communication with each other, initiate the control of the ONU that ONU is in communication with each other
Unit can send demand signalling to this optical line terminal, and the request of this demand signalling is communicated with other ONU.Optical line terminal
Forward this demand signalling.The control unit of other ONU receives forwarded, this request letter from this ONU by this optical line terminal
Order, and determine whether to be communicated with this ONU, after determination is communicated, send to this optical line terminal and confirm message.Light
Road terminal forwards this confirmation message to postback the control unit of the ONU that ONU is in communication with each other.After determination is in communication with each other, light
The main control unit of line terminal can determine aforementioned schedule information, sends, to distribute ONU, the time slot being in communication with each other shared by information,
And this schedule information is notified transmitting terminal ONU and receiving terminal ONU.Afterwards, each ONU and OLT can be as institute in aforementioned embodiments
Ground is described in detail in detail come into operation like that.
It is appreciated that in terms of the aspect realized, upstream data, being in communication with each other information and the respective frame structure of downlink data
May need to change or redesign, but this has not had too many dependence with the above design of the present invention.This area
Those skilled in the art can be modified to frame structure according to actual needs and reasonably or design, and the present invention is no longer gone to live in the household of one's in-laws on getting married
State.
It should be noted that in the case of not conflicting, the embodiment in the application and the feature in embodiment can phases
Mutually it is combined.
Certainly, the present invention also can have other various embodiments, in the case of without departing substantially from present invention spirit and its essence, ripe
Know those skilled in the art to make various corresponding changes according to the present invention and deform, but these corresponding changes and deformation
The protection domain of appended claims of the invention all should be belonged to.
One of ordinary skill in the art will appreciate that all or part of step in said method can be instructed by program
Related hardware completes, and described program can be stored in computer-readable recording medium, such as read-only storage, disk or CD
Deng.Alternatively, all or part of step of above-described embodiment can also be realized using one or more integrated circuits.Accordingly
Ground, each module/unit in above-described embodiment can be to be realized in the form of hardware, it would however also be possible to employ the shape of software function module
Formula is realized.The present invention is not restricted to the combination of the hardware and software of any particular form.
Claims (15)
1. a kind of optical network unit, including such as lower component：
- generating portion, for generating uplink optical signal, this uplink optical signal include being modulated to the first communication wavelengths, with when
Point between the upstream data that mode is multiplexed and optical network unit first is in communication with each other information；
- output interface, for being sent to optical line terminal by this uplink optical signal；
- input interface, for receiving the downlink optical signal from this optical line terminal, wherein, contains it in this downlink optical signal
Between optical network unit that his optical network unit is sent, being modulated to the second communication wavelengths second is in communication with each other information；
- the first tunable optical filter, for leaching the optical signal of this second communication wavelengths from this downlink optical signal being received；
- communication control processor, for detecting to the optical signal of this second communication wavelengths, obtains this and second is in communication with each other information.
2. optical network unit according to claim 1 is it is characterised in that described generating portion includes：
- combining unit, for by upstream data and this first be in communication with each other information and merged in the way of the time-division；
- tunable laser, by this upstream data merging in a time division manner and this first be in communication with each other information and driven, by this
Row data and this first be in communication with each other modulates information in this first communication wavelengths, form this uplink optical signal.
3. optical network unit according to claim 1 it is characterised in that：This first communication wavelengths and this second communication wavelengths
Identical or different.
4. optical network unit according to claim 2 is it is characterised in that this downlink optical signal of being received of this input interface
In also contain the downlink data being modulated in certain downstream wavelength；
This optical network unit is also included as lower component：
- wavelength-division multiplex unit, for separating the optical signal of this certain downstream wavelength with the optical signal of this second communication wavelengths；
- the second tunable optical filter, for leaching the optical signal of this certain downstream wavelength；
- downlink receiver, for carrying out descending detection to the optical signal of this certain downstream wavelength, obtains this downlink data.
5. optical network unit according to claim 2 is it is characterised in that this upstream data is placed on by described combining unit
First time slot (Ti), this first is in communication with each other information and is positioned over this first time slot (Ti) give the second time slot after postponing (t).
6. optical network unit according to claim 5 is it is characterised in that this optical network unit and other at least one light nets
Network unit shares this first communication wavelengths, and this first time slot used by this optical network unit and this second time slot and this other extremely
Each time slot used by a few optical network unit distinguishes in a time division manner.
7. optical network unit according to claim 4 is it is characterised in that also include：
- control unit, for receiving the schedule information from this optical line terminal, this schedule information indicates and sends line number on this
According to this first be in communication with each other information place time slot, and receive this downlink data and this second be in communication with each other information place
Time slot.
8. optical network unit according to claim 7 is it is characterised in that this control unit is additionally operable to this optical line terminal
Send demand signalling, the request of this demand signalling is communicated with other optical network units, and for receiving from this optical link eventually
The confirmation message at end；
After receiving this confirmation message, this combining unit is operated.
9. optical network unit according to claim 8 is it is characterised in that described control unit is additionally operable to：
Receive the forwarded, demand signalling from other optical network units by this optical line terminal, this demand signalling asks this light
Other optical network units of NE and this are communicated；
Determine whether to be communicated with this other optical network unit, after determination is communicated, send really to this optical line terminal
Recognize message；
After determining communication, described first tunable optical filter and described communication control processor are operated.
10. a kind of optical line terminal, including such as lower component：
- input interface, for receiving the uplink optical signal from optical network unit, wherein, this uplink optical signal includes being modulated
It is in communication with each other information between certain communication wavelengths, the upstream data that merges in a time division manner and optical network unit；
- switching switch, in a time division manner by the uplink optical signal of this upstream data and this be in communication with each other the optical signal of information
Switch to uplink receiver and communications processor element respectively；
- uplink receiver, for detecting the uplink optical signal of this upstream data, obtains this upstream data；
- communications processor element, the optical signal for this is in communication with each other information is sent to corresponding optical network unit.
11. optical line terminals according to claim 10 are not it is characterised in that this input interface is shared the same light for receiving to be derived from
This uplink optical signal of NE, wherein, is not shared the same light net in a time division manner using the uplink optical signal of same communication wavelength
Network unit sends,
This optical line terminal includes multigroup switching switch and the uplink receiver corresponding respectively to different communication wavelength, this optical link
Terminal also includes：
- the first array waveguide grating, for separating the uplink optical signal of this different communication wavelength and being respectively supplied to corresponding
Switching switch；
This communications processor element also includes：
- the second array waveguide grating, is connected with each switching switch, respectively for being in communication with each other information on different communication wavelength
Optical signal be coupled to be sent to each optical network unit.
12. optical line terminals according to claim 11 are it is characterised in that also include as lower component：
- downstream transmitter, for providing in certain downstream wavelength, to have modulated downlink data optical signal；
- wavelength-division multiplex unit, is coupled to this downstream transmitter and this second array waveguide grating, for having modulated downlink data
Optical signal and different communication wavelength on, the optical signal of having modulated the information of being in communication with each other be multiplexed with downlink optical signal, to send
To each optical network unit.
13. optical line terminals according to claim 12 it is characterised in that include multiple downstream transmitter, each descending
Machine of penetrating provides and is modulated in different downstream wavelength, downlink data optical signal, and this optical line terminal also includes：
- the three array waveguide grating, is coupled to each downstream transmitter, for the optical signal of different downstream wavelength is coupling in one
Rise, to be supplied to this wavelength-division multiplex unit.
14. optical line terminals according to claim 10 are it is characterised in that also include as lower component：
- main control unit, sends schedule information for determining and to each optical network unit, this schedule information indicates each optical-fiber network list
Unit send this upstream data and be in communication with each other information place time slot, and receive this be in communication with each other information place time slot.
15. optical line terminals according to claim 14 are it is characterised in that described main control unit is additionally operable to：
Receive the demand signalling from optical network unit, this demand signalling asks other optical network units to enter with this optical network unit
Row communication；
This demand signalling is transmitted to this other optical network unit；
Receive the confirmation message from this other optical network unit；
This confirmation message is forwarded back to this optical network unit.
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| CN105763964B (en) * | 2014-12-19 | 2020-04-21 | 中兴通讯股份有限公司 | Communication method, device and system applied to OFDM-PON |
| CN106792281B (en) * | 2015-11-20 | 2019-09-24 | 上海诺基亚贝尔股份有限公司 | Optical line terminal and optical network unit |
| TWI629876B (en) * | 2016-11-30 | 2018-07-11 | 中華電信股份有限公司 | An elastic physical layer grid optical network interactive operation transmission device for switching and converting an upstream optical wavelength of a plurality of optical network units into a specified optical wavelength of NG-PON2 |
| US10511382B2 (en) * | 2018-01-30 | 2019-12-17 | Huawei Technologies Co., Ltd. | Dynamic monitoring and calibration of nodes in an optical networking device |
| CN113973239A (en) * | 2020-07-24 | 2022-01-25 | 上海诺基亚贝尔股份有限公司 | Method, apparatus, optical network unit, optical line terminal and medium for communication |
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| CN101222279A (en) * | 2007-01-09 | 2008-07-16 | 日立通讯技术株式会社 | Passive optical network system and wavelength assignment method |
| CN102523039A (en) * | 2011-12-27 | 2012-06-27 | 上海大学 | System and method for realizing same-wavelength uplink and downlink isolation and grading protection functions of colorless wavelength division multiplexing optical access network |
| CN103109476A (en) * | 2012-10-26 | 2013-05-15 | 华为技术有限公司 | Passive optical communication method, system, and optical line terminal |
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| CN101222279A (en) * | 2007-01-09 | 2008-07-16 | 日立通讯技术株式会社 | Passive optical network system and wavelength assignment method |
| CN102523039A (en) * | 2011-12-27 | 2012-06-27 | 上海大学 | System and method for realizing same-wavelength uplink and downlink isolation and grading protection functions of colorless wavelength division multiplexing optical access network |
| CN103109476A (en) * | 2012-10-26 | 2013-05-15 | 华为技术有限公司 | Passive optical communication method, system, and optical line terminal |
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