CN104218997A - Optical network unit and optical link terminal - Google Patents
Optical network unit and optical link terminal Download PDFInfo
- Publication number
- CN104218997A CN104218997A CN201310210219.XA CN201310210219A CN104218997A CN 104218997 A CN104218997 A CN 104218997A CN 201310210219 A CN201310210219 A CN 201310210219A CN 104218997 A CN104218997 A CN 104218997A
- Authority
- CN
- China
- Prior art keywords
- optical
- optical network
- network unit
- wavelength
- communication
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
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, particularly relate to EPON.
Background technology
Such as, along with the multimedia extensive use of advanced person, 3D TV, Telemedicine, game on line, the exploitation of the application such as interdynamic video e-learning, has had huge growth to the demand of bandwidth.PON2 (NG-PON2) of future generation is as the PON solution of Long Term Evolution, be intended to improve multi-plexing light accessing system ability to support these bandwidth applications better, it is just as a focus subject under discussion, discussed by portion of international telecommunication union telecommunication (ITU-T) and FSAN (Full Service Access Network is called for short FSAN) tissue.Most operator wishes bandwidth, higher splitting ratio (being greater than 1: 64), longer transmission range and better access capability that NG-PON2 can provide larger.At present, ITU-T and FSAN is finally determining the demand of NG-PON2, so that available bandwidth is increased to 40Gb/s speed.
In the technical scheme proposed, TWDM-PON be considered as by nearest FSAN meeting primary solutions to NG-PON2, wherein, 4 10G-PON (XG-PON) are stacked on together and have the splitting ratio of 1: 64, and this can obtain the convergence speed of down direction 40Gbps and up direction 10GGbps.In single wavelength, TWDM-PON has reused the descending multiplexing of XG-PON and multi-upstream access technology, time slot granularity, multicast capability and Bandwidth sharing mechanism.
Current TWDM-PON system architecture is, optical line terminal (OLT) by Fiber connection to remote node (RN), remote node again by Fiber connection to optical network unit (ONU).
In TWDM-PON system, often need the intercommunication mutually carried out between ONU.In current system, this mutual communication information is modulated on light signal by ONU, by up direction sends to OLT, stands light-to-current inversion at OLT place, forms the signal of telecommunication.This signal of telecommunication is then buffered and is scheduled, and then is modulated on certain wavelength, at suitable time slot by down direction sending to relevant ONU.Visible, carry out the operations such as light-current to light inversion, buffer memory, scheduling due to needs, this technical scheme creates larger communication delay.Further, the load of OLT also can be remarkably increased because of the operation such as light-to-current inversion, buffer memory, have impact on the performance of system.Below in these scenes, these postpone responsive especially:
Based in LTE-A mobile retransmission (backhaul) network of PON technology, base station (eNodeB) is wished by logic X2 interface, to intercom mutually with other base stations with the speed of Gb/s rank lower than the delay of 1 millisecond, thus carry out the relevant operation of collaborative multiple antennas, such as exchanges data is carried out in the precoding across base band, etc.But, in existing TWDM-PON structure, interconnected between base station be based on ONU between intercommunication mutually realize, due to aforesaid reason, the intercommunication of this phase is subject to the delayed impact that light-electrical-optical conversion, buffer memory etc. cause.This delay can not meet end-to-end delay demand strict in LTE-A network.
In addition, TWDM-PON network needs the splitting ratio being no less than 1: 64, and need long distance (long reach) function, this means to need to dispose more ONU, thus more ONU intercommunication can be there is, therefore the total delay that ONU phase intercoms also can increase, and this has negative impact to the application of the delay sensitive such as game on line, video conference.
Summary of the invention
There is in the industry the method for the intercommunication of the ONU of several realization in TDM-PON and TWDM-PON, their technical essential and shortcoming as follows listed by:
1. on ONU, use special transmitter and wavelength to intercom to send ONU phase.The shortcoming of this implementation is the wavelength needed outside occupying volume, and also needs newly-increased extra light source etc., thus adds the cost of ONU;
2., in optical distributed network (ODN), the route reflection of optics is carried out to the intercommunication mutually between ONU.Such as, the remote node (RN) in ODN is arranged the star-type coupler of 2Nx2N or the loopback array waveguide grating (AWG) of multiport.The shortcoming of this implementation is, needs to change RN, and operator does not generally wish to change the remote node already disposed.
In ODN, carry out route reflection to the business that ONU phase intercoms, this also has a shortcoming: these communications cannot be controlled by OLT, and this can cause operator effectively directly cannot control the intercommunication of this phase, such as cannot statistic flow, charging etc.Therefore, it is desirable to realize the mutual communication mechanism of the controlled ONU of OLT.
In order to solve above technical problem, if can provide the full light of a kind of ONU of low cost the mutual communication technology, and this communication can control by OLT, so will be conducive to improving the performance of PON very much.
At least in part from the above considerations, inventive concept of the present invention is, together with intercommunication and the upstream data of ONU-OLT mutually between ONU is sequentially multiplexing, is sent by communication wavelengths (i.e. up wavelength).And at OLT end, it sequentially carries out demultiplexing to the mutual communication information and upstream data, and the light signal of upstream data detects, and the light signal intercomed mutually reflects to corresponding ONU.
The inventive point be more preferably of the present invention can as follows listed by:
1., in ONU end, by an electric combiner, information upstream data and ONU phase intercomed for interval, merges into an information flow with a time delay.This information flow is directly used in the tunable laser controlling to have certain communication wavelengths, has modulated upstream data multiplexing in a time division manner and the mixing uplink optical signal intercomed mutually to produce.This upstream data shares this communication wavelengths (up wavelength) with intercoming mutually.
2., at OLT end, adopt the optical switch that automatically controlled, according to above time delay, the light signal that time-multiplexed upstream data and ONU phase intercom is carried out demultiplexing.
3. the light signal of demultiplexing upstream data is out sent to uplink receiver and carries out normal up detection.
4. the light signal that intercoms of demultiplexing ONU phase is out by array waveguide grating, with demultiplexing similarly out, the light signal intercomed mutually that other ONU send in other communication wavelengths carries out wavelength division multiplexing again.Then all ONU are returned to uniformly again by simple optical fiber.
5. at ONU place, in order to receive the intercommunication mutually from other ONU, ONU has an adjustable filter, and the ONU phase that will receive to select it intercoms the communication wavelengths at place.Can support that the ONU phase of (ONU belongs to different up wavelength (communication wavelengths) groups) between PON intercoms, also can support that the ONU phase in PON intercoms (ONU belongs to same up wavelength (communication wavelengths) group).
Based on above inventive concept and inventive point, one aspect of the present invention provides a kind of optical network unit, comprise as lower component: generating portion, for generating uplink optical signal, this uplink optical signal comprise be modulated to the first communication wavelengths, first-phase between upstream data multiplexing in a time division manner and optical network unit intercommunication information; And output interface, for this uplink optical signal is sent to optical line terminal.
Correspondingly, another aspect of the present invention provides a kind of optical line terminal, comprise as lower component: input interface, for receiving the uplink optical signal from optical network unit, wherein, this uplink optical signal comprises the mutual communication information between upstream data that be modulated to certain communication wavelengths, that merge in a time division manner and optical network unit; Diverter switch, for switching to uplink receiver and communications processor element respectively by the light signal of the uplink optical signal of this upstream data and this mutual communication information in a time division manner; Uplink receiver, for detecting the uplink optical signal of this upstream data, obtains this upstream data; Communications processor element, for sending to corresponding optical network unit by the light signal of this mutual communication information.
The advantage of above aspect is:
First, ONU can carry out the intercommunication mutually of full light with higher speed and lower delay; Do not need at OLT end the conversion and the caching that carry out complicated light-electrical-optical, reduce the load of OLT, improve network efficiency.
Secondly, the up wavelength that upstream data is shared identical with intercommunication mutually, significantly reduces ONU wavelength and takies.
Further, do not need to change optical distributed network (ODN), such as, can maintain remote node (RN) constant.
According to one preferred embodiment, described generating portion comprises: merge cells, for upstream data and this first-phase intercommunication information being merged in the mode of time-division; And tunable laser, driven by this upstream data merged in a time division manner and this first-phase information that intercoms, this upstream data and this first-phase intercomed modulates information in this first communication wavelengths, forms this uplink optical signal.
This embodiment offers the implementation that of realizing generating portion is more concrete.In this execution mode, upstream data and this first-phase intercommunication information can merge into bit stream on the level of electricity, and then control tunable laser again, and create time-multiplexed light signal easily, have shared tunable laser, cost is very low.
According to one preferred embodiment, this optical network unit also comprises as lower component: input interface, for receiving the downlink optical signal from this optical line terminal, wherein, the second-phase intercommunication information between optical network unit that send containing other optical network units in this downlink optical signal, that be modulated to second communication wavelength; First tunable optical filter, for leaching the light signal of this second communication wavelength from this received downlink optical signal; Communication control processor, for detecting the light signal of this second communication wavelength, obtains this second-phase intercommunication information.
This embodiment offers the scheme receiving the intercommunication of this phase in ONU.
In one embodiment, this first communication wavelengths is identical with this second communication wavelength, and namely this optical network unit and other at least one optical network units share this first communication wavelengths.And this first time slot that this optical network unit is used and this second time slot and these other at least one optical network units each time slot used distinguish in a time division manner.
In TWDM-PON framework, there is the ONU group using multiple ONU of phase co-wavelength to form.Present embodiment just can support that the ONU in ONU group (ONU belongs to same up wavelength (communication wavelengths) group) carries out (Intra-PON) in PON and intercoms mutually.
In one embodiment, this first communication wavelengths is different from this second communication wavelength.Present embodiment can support that ONU belongs to different up wavelength (communication wavelengths) groups) ONU phase intercom, achieve (Inter-PON) between PON and intercom mutually.
According to a further execution mode, also containing the downlink data be modulated in certain downstream wavelength in this downlink optical signal that this input interface receives; This optical network unit also comprises as lower component: wavelength division multiplexing unit, for being separated by the light signal of the light signal of this certain downstream wavelength with this second communication wavelength; Second tunable optical filter, for leaching the light signal of this certain downstream wavelength; Downlink receiver, for carrying out descending detection to the light signal of this certain downstream wavelength, obtains this downlink data.
In this execution mode, downlink data and the mutual communication information returning ONU can together with wavelength division multiplexing, and ONU has corresponding device by their demultiplexings to receive respectively, only use simple optical fiber to communicate.
According to a further execution mode, this optical network unit and other at least one optical network units share this first communication wavelengths, and this optical network unit this first time slot used and this second time slot and these other at least one optical network units each time slot used distinguish in a time division manner.
In TWDM-PON framework, there is the ONU group using multiple ONU of phase co-wavelength to form.This execution mode allows each ONU in ONU group to come sequentially to send upstream data and the mutual communication information in a time division manner, provides the better support to the multiple ONU in ONU group.
According to a further execution mode, this optical network unit also comprises: control unit, for receiving the schedule information from this optical line terminal, this schedule information indicates the time slot sending this upstream data and this first-phase intercommunication information place, and receives the time slot at this downlink data and this second-phase intercommunication information place.
Correspondingly, in optical line terminal, comprising: main control unit, for determining and sending schedule information to each optical network unit, this schedule information indicates the time slot that each optical network unit sends this upstream data and mutual communication information place, and receives the time slot at this mutual communication information place.
In this execution mode, optical network unit by the control of optical line terminal, therefore can have very strong flexibility, and also has better configurability.
According to a further execution mode, this control unit also for: send request signaling to this optical line terminal, this demand signalling request communicates with other optical network units, and for receiving the acknowledge message from this optical line terminal; After receiving this acknowledge message, this merge cells operates; And for: receive forwarded by this optical line terminal, from the demand signalling of other optical network units, these other optical network units of demand signalling request this optical network unit and this communicate; Determine whether to communicate with these other optical network units, after determining to communicate, send acknowledge message to this optical line terminal; After determining communication, described first tunable optical filter and described communication control processor operate.
Correspondingly, in optical line terminal, this main control unit also for: receive the demand signalling from optical network unit, these other optical network units of demand signalling request communicate with this optical network unit; This demand signalling is transmitted to these other optical network units; Receive the acknowledge message from these other optical network units; This acknowledge message is forwarded back to this optical network unit.
This embodiment offers for consulting the signaling procedure starting to intercom mutually between ONU, and provide OLT carries out transfer technical scheme to this signaling.This execution mode is perfect carries out the control flow that full light ONU phase intercoms.
In optical line terminal, this input interface of optical line terminal is for receiving this uplink optical signal from different optical network unit, wherein, the uplink optical signal of same communication wavelength is used to be sent by different optical network unit in a time division manner, this optical line terminal comprises the many groups diverter switch and uplink receiver that correspond respectively to different communication wavelength, this optical line terminal also comprises: the first array waveguide grating, for the uplink optical signal demultiplexing of this different communication wavelength is also supplied to corresponding diverter switch respectively; This communications processor element also comprises: the second array waveguide grating, is connected respectively with each diverter switch, for by the optical multiplexed signal of the mutual communication information on different communication wavelength with together to send to each optical network unit.
In this embodiment, optical line terminal is supported that multiple optical network unit uses different communication wavelength to send respectively and is intercomed mutually, and the intercommunication mutually between the ONU of support wavelength division multiplexing, improves the message capacity intercomed mutually.
In a further execution mode, this optical line terminal also comprises as lower component: downstream transmitter, for providing in certain downstream wavelength, having modulated the light signal of downlink data; Wavelength division multiplexing unit, be coupled to this downstream transmitter and this second array waveguide grating, for by the light signal modulating downlink data and different communication wavelength, the light signal of having modulated the mutual communication information is multiplexed with downlink optical signal, to send to each optical network unit.
In this embodiment, downlink data can wavelength-division ground multiplexing with the mutual communication information together with, improve message capacity.
Accompanying drawing explanation
By reading the detailed description done non-limiting example done with reference to the following drawings, other features, objects and advantages of the present invention will become more apparent:
Fig. 1 gives the structure chart of the ONU according to an embodiment of the invention;
Fig. 2 give according to an embodiment of the invention, the upstream data of multiple ONU of sharing same communication wavelengths and the multiplexing in a time division manner time slot allocation schematic diagram of 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.
Embodiment
One aspect of the present invention provides a kind of optical network unit, comprise as lower component: generating portion, for generating uplink optical signal, this uplink optical signal comprise be modulated to the first communication wavelengths, first-phase between upstream data multiplexing in a time division manner and optical network unit intercommunication 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 comprises:
-merge cells, for merging upstream data and this first-phase intercommunication information in the mode of time-division;
-tunable laser, driven by this upstream data merged in a time division manner and the first-phase information that intercoms, this upstream data and this first-phase intercomed modulates information in this first communication wavelengths, forms this uplink optical signal.
More concrete, this upstream data is placed on the first time slot T by merge cells
i, this first-phase intercommunication information is positioned over this first time slot T
ithe second time slot after given delay t.As shown in Figure 1, this optical network unit can have a delay cell, it first-phase is intercomed information frame delay t after be supplied to merge cells.The frame of upstream data and first-phase the are intercomed frame of information of merge cells is synthesized together as information flow/bit stream, reoffers and modulates to tunable laser.
The tunable laser producing light signal for controlled by bit stream is known in the art, and various laser such as such as DFB etc. may be used to realize this function.It is at the first communication wavelengths λ '
1upper generation has been modulated upstream data and first-phase and have been intercomed the light signal of information, light signal and the ONU-1 phase of the upstream data as shown in ONU-1UL in Fig. 2 intercom the shown mutual communication information light signal shown in.
Under the network configuration of TWDM-PON, in order to improve the durability of network, middlely can there is the group be made up of several ONU in PON, the ONU in this group shares identical up wavelength.Such as right side dotted line institute frame in Fig. 3, the ONU1-n in ONU group 1 share up wavelength X '
1; ONU1-n in ONU group 2 share up wavelength X '
3; Also comprise two independent ONU take respectively up wavelength X '
2with λ '
4.In this case, in order to avoid conflict, for certain ONU group, the uplink optical signal that the ONU in this group sends distinguishes in a time division manner, this first time slot T that the optical network unit namely in this group is used
iwith this second time slot T
iother optical network units in+t and this group each time slot used distinguishes in a time division manner.Such as, as shown in Figure 2, the light signal of ONU1, ONU2 and ONU3 upstream data separately and the light signal of the mutual communication information multiplexing at up wavelength (communication wavelengths) λ ' in a time division manner
1on.
Preferably, in one embodiment, this ONU also comprises control unit, and for receiving the schedule information from this optical line terminal OLT, this schedule information indicates the time slot sending this upstream data and this first-phase intercommunication information place.Correspondingly, OLT comprises a main control unit, and this main control unit is used for determining and sends schedule information to each optical network unit, and this schedule information indicates the time slot that each optical network unit sends this upstream data and mutual communication information place.This schedule information can be carried by control signal between OLT and ONU.One of ordinary skill in the art can adjust accordingly to hold this schedule information to the content of existing control signal, or define new control signal be exclusively used in send this schedule information, the present invention no longer specifically repeats.Be appreciated that, the ONU receiving this mutual communication information should receive on the receiving slot of identical with sending time slots (or slight delay a bit), and the main control unit of this optical line terminal is also by the control unit of this receiving slot notice receiving terminal optical network unit.
Continue as shown in Figure 1, it is multiplexing at λ ' that tunable laser exports
1on upstream data and the light signal of the mutual communication information by after loopback device, exported by output interface.This output interface can comprise WDM (wavelength division multiplexing) part in figure.
Forward Fig. 3 to, each communication wavelengths λ ' that each ONU sends
1, λ '
2, λ '
3with λ '
4multiplexed signals reach remote node RN by optical fiber.This remote node RN comprises luminous-power distributor, and it by together multiplexing for the light signal wavelength-division of each communication wavelengths ground, and sends to optical line terminal OLT again by optical fiber.Remote node in this remote node and existing optical distributed network (ODN) indifference, therefore avoid and change existing ODN, have applicability very widely.
A kind of optical line terminal according to the present invention comprises as lower component:
-input interface, for receiving the uplink optical signal from optical network unit, wherein, this uplink optical signal comprises the mutual communication information between upstream data that be modulated to certain communication wavelengths, that merge in a time division manner and optical network unit;
-diverter switch, for switching to uplink receiver and communications processor element respectively by the light signal of the uplink optical signal of this upstream data and this mutual communication information in a time division manner;
-uplink receiver, for detecting the uplink optical signal of this upstream data, obtains this upstream data;
-communications processor element, for sending to corresponding optical network unit by the light signal of this mutual communication information.
Particularly, as shown in Figure 3, this input interface can be the WDM part in figure, its receive from remote node, each communication wavelengths λ ' of wavelength division multiplexing
1, λ '
2, λ '
3with λ '
4multiplexed signals, this multiplexed signals comprises upstream data and the mutual communication information of ONU of each ONU.
In order to each communication wavelengths λ '
1, λ '
2, λ '
3with λ '
4signal separator, will as shown in Figure 3, this multiplexed signals reaches the first array waveguide grating AWG1 by loopback device, its for by this different communication wavelength X '
1, λ '
2, λ '
3with λ '
4uplink optical signal be separated.
As shown in Figure 3, this optical line terminal comprise correspond respectively to different communication wavelength X '
1, λ '
2, λ '
3with λ '
4many groups diverter switch and uplink receiver.This diverter switch is such as automatically controlled optical switch (or claiming electrooptical switching, E/O switch).The light signal of upstream data is exported to uplink receiver at the time slot of corresponding upstream data by this diverter switch, and at the time slot of the mutual communication information of ONU, the light signal intercomed mutually is supplied to communications processor element.Be appreciated that the time slot of this upstream data and the time slot of the mutual communication information of ONU distributed by OLT, 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 comprises the second array waveguide grating AWG2 and WDM part.Different communication wavelength X '
1, λ '
2, λ '
3with λ '
4on the mutual communication information light signal by this second array waveguide grating AWG2 again by wavelength division multiplexing together.
Meanwhile, in order to realize downlink communication, optical line terminal also comprises multiple downstream transmitter Tx1-4, is respectively used to provide certain downstream wavelength λ
1, λ
2, λ
3and λ
4on, modulated the light signal of downlink data.Optical line terminal also comprises the 3rd array waveguide grating AWG3, is coupled to each downstream transmitter, for by the light signal wavelength division multiplexing of different downstream wavelength together, to be supplied to this WDM part.
This WDM part by the different communication wavelength X of wavelength division multiplexing '
1, λ '
2, λ '
3with λ '
4on the light signal of the mutual communication information, and the different downstream wavelength λ of wavelength division multiplexing
1, λ
2, λ
3and λ
4on downstream signal carry out wavelength division multiplexing, obtain descending light signal, this downlink optical signal sent it 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.
Get back to Fig. 1, the WDM part of ONU receives this light signal as input interface, and this light signal is supplied to the receiving unit that downlink data receiving unit intercoms with ONU phase by respectively.
As shown in fig. 1, downlink data receiving unit comprises the second tunable filter and downlink receiver.This optical signals second tunable filter institute filtering, the operation wavelength of this filter is adjusted to the wavelength at the downlink data place that will receive, such as λ
1on.So except λ
1outside wavelength, the light signal of the downlink data on other wavelength and the mutually communication information is all by filtering.Downlink receiver is to this certain downstream wavelength λ
1light signal carry out descending detection, obtain this downlink data.
As shown in fig. 1, the receiving unit that ONU phase intercoms comprises the first tunable filter and communication control processor.The downlink optical signal provided through loop device is by the first tunable filter, the operation wavelength of this filter is adjusted to the communication wavelengths at the mutual communication information place that will receive, so except this wavelength, the light signal of the mutual communication information in the downlink data of wavelength division multiplexing and other communication wavelengths is all by filtering.Communication control processor carries out descending detection to the light signal of this communication wavelengths, obtains this downlink data.As previously mentioned, actual receiving slot is notified the control unit of this ONU by the main control unit of optical line terminal.
By regulating the operation wavelength of the first tunable filter, ONU can receive the mutual communication information from different ONU.
Concrete, in one embodiment, for certain ONU group, certain ONU of its inside can receive the mutual communication information that other ONU in same group send with identical communication wavelengths, as long as the first tunable filter is adjusted to this communication wavelengths.Such as, as shown in Figure 2, ONU1 is at T
1+ t time slot have sent the mutual communication information of ONU, and during this time, the radiating portion of the ONU2 in ONU group 1 does not work, and its first tunable filter is adjusted to λ '
1wavelength, to receive the mutual communication information of ONU that ONU1 sends.As shown in Figure 3, the communication of (intra-PON) in PON is this achieved
In an alternative execution mode, the optical network unit sending the mutual communication information is the ONU2 in ONU group 1.As shown in Figure 2, it is at T
2+ t time slot sends.At synchronization, belong to another communication wavelengths λ '
2oNU its first tunable filter can be adjusted to λ '
1wavelength, receives the mutual communication information from the ONU2 made in ONU group 1.As shown in Figure 3, the communication of (inter-PON) between PON is this achieved.Meanwhile, this belongs to another communication wavelengths λ '
2oNU radiating portion also can wavelength X '
2above freely send its upstream data and the mutual communication information, can not λ ' be subject to
1the impact of wavelength.
In one preferred embodiment, before intercoming mutually, the control unit of initiating the ONU that ONU phase intercoms can send request signaling to this optical line terminal, and this demand signalling request communicates with other ONU.Optical line terminal forwards this demand signalling.The control unit of other ONU receive forwarded by this optical line terminal, from this demand signalling of this ONU, and determine whether to communicate with this ONU, after determining to communicate, send acknowledge message to this optical line terminal.Optical line terminal forwards the control unit that this acknowledge message has postbacked the ONU that ONU phase intercoms.After determining to intercom mutually, the main control unit of optical line terminal can determine aforementioned schedule information, sends time slot shared by the mutual communication information to distribute ONU, and by this schedule information notice transmitting terminal ONU and receiving terminal ONU.Afterwards, each ONU and OLT can as in aforementioned embodiments describe in detail come into operation.
Be appreciated that the aspect from realizing, upstream data, the mutually communication information and downlink data frame structure separately may need to change or redesign, but this and above design of the present invention have not had too many dependence.One of ordinary skill in the art can change frame structure according to actual needs and reasonably or design, and the present invention no longer repeats.
It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combination in any mutually.
Certainly; the present invention also can have other various embodiments; when not deviating from the present invention's spirit and essence thereof; those of ordinary skill in the art can make various corresponding change and distortion according to the present invention, but these change accordingly and are out of shape the protection range that all should belong to the claim appended by the present invention.
The all or part of step that one of ordinary skill in the art will appreciate that in said method is carried out instruction related hardware by program and is completed, and described program can be stored in computer-readable recording medium, as read-only memory, disk or CD etc.Alternatively, all or part of step of above-described embodiment also can use one or more integrated circuit to realize.Correspondingly, each module/unit in above-described embodiment can adopt the form of hardware to realize, and the form of software function module also can be adopted to realize.The present invention is not restricted to the combination of the hardware and software of any particular form.
Claims (15)
1. an optical network unit, comprises as lower component:
-generating portion, for generating uplink optical signal, this uplink optical signal comprise be modulated to the first communication wavelengths, first-phase between upstream data multiplexing in a time division manner and optical network unit intercommunication information;
-output interface, for sending to optical line terminal by this uplink optical signal.
2. optical network unit according to claim 1, is characterized in that, described generating portion comprises:
-merge cells, for merging upstream data and this first-phase intercommunication information in the mode of time-division;
-tunable laser, driven by this upstream data merged in a time division manner and this first-phase information that intercoms, this upstream data and this first-phase intercomed modulates information in this first communication wavelengths, forms this uplink optical signal.
3. optical network unit according to claim 1, is characterized in that, also comprises as lower component:
-input interface, for receiving the downlink optical signal from this optical line terminal, wherein, the second-phase intercommunication information between optical network unit that send containing other optical network units in this downlink optical signal, that be modulated to second communication wavelength;
-the first tunable optical filter, for leaching the light signal of this second communication wavelength from this received downlink optical signal;
-communication control processor, for detecting the light signal of this second communication wavelength, obtains this second-phase intercommunication information;
Wherein, this first communication wavelengths and this second communication wavelength identical or different.
4. optical network unit according to claim 2, is characterized in that, also containing the downlink data be modulated in certain downstream wavelength in this downlink optical signal that this input interface receives;
This optical network unit also comprises as lower component:
-wavelength division multiplexing unit, for being separated the light signal of the light signal of this certain downstream wavelength with this second communication wavelength;
-the second tunable optical filter, for leaching the light signal of this certain downstream wavelength;
-downlink receiver, for carrying out descending detection to the light signal of this certain downstream wavelength, obtains this downlink data.
5. optical network unit according to claim 2, is characterized in that, this upstream data is placed on the first time slot (T by described merge cells
i), this first-phase intercommunication information is positioned over this first time slot (T
i) the second time slot after given delay (t).
6. optical network unit according to claim 5, it is characterized in that, this optical network unit and other at least one optical network units share this first communication wavelengths, and this optical network unit this first time slot used and this second time slot and these other at least one optical network units each time slot used distinguish in a time division manner.
7. optical network unit according to claim 4, is characterized in that, also comprises:
-control unit, for receiving the schedule information from this optical line terminal, this schedule information indicates the time slot sending this upstream data and this first-phase intercommunication information place, and receives the time slot at this downlink data and this second-phase intercommunication information place.
8. optical network unit according to claim 7, it is characterized in that, this control unit is also for sending request signaling to this optical line terminal, and this demand signalling request communicates with other optical network units, and for receiving the acknowledge message from this optical line terminal;
After receiving this acknowledge message, this merge cells operates.
9. optical network unit according to claim 8, is characterized in that, described control unit also for:
Receive forwarded by this optical line terminal, from the demand signalling of other optical network units, these other optical network units of demand signalling request this optical network unit and this communicate;
Determine whether to communicate with these other optical network units, after determining to communicate, send acknowledge message to this optical line terminal;
After determining communication, described first tunable optical filter and described communication control processor operate.
10. an optical line terminal, comprises as lower component:
-input interface, for receiving the uplink optical signal from optical network unit, wherein, this uplink optical signal comprises the mutual communication information between upstream data that be modulated to certain communication wavelengths, that merge in a time division manner and optical network unit;
-diverter switch, for switching to uplink receiver and communications processor element respectively by the light signal of the uplink optical signal of this upstream data and this mutual communication information in a time division manner;
-uplink receiver, for detecting the uplink optical signal of this upstream data, obtains this upstream data;
-communications processor element, for sending to corresponding optical network unit by the light signal of this mutual communication information.
11. optical line terminals according to claim 10, it is characterized in that, this input interface for receiving this uplink optical signal from different optical network unit, wherein, the uplink optical signal of same communication wavelength is used to be sent by different optical network unit in a time division manner
This optical line terminal comprises the many groups diverter switch and uplink receiver that correspond respectively to different communication wavelength, and this optical line terminal also comprises:
-the first array waveguide grating, for being separated the uplink optical signal of this different communication wavelength and being supplied to corresponding diverter switch respectively;
This communications processor element also comprises:
-the second array waveguide grating, is connected with each diverter switch respectively, for by the optical signal of the mutual communication information on different communication wavelength together to send to each optical network unit.
12. optical line terminals according to claim 11, is characterized in that, also comprise as lower component:
-downstream transmitter, for providing in certain downstream wavelength, having modulated the light signal of downlink data;
-wavelength division multiplexing unit, be coupled to this downstream transmitter and this second array waveguide grating, for by the light signal modulating downlink data and different communication wavelength, the light signal of having modulated the mutual communication information is multiplexed with downlink optical signal, to send to each optical network unit.
13. optical line terminals according to claim 12, is characterized in that, comprise multiple downstream transmitter, and each downstream transmitter provides and is modulated to light signal in different downstream wavelength, downlink data, and this optical line terminal also comprises:
-three array waveguide grating, is coupled to each downstream transmitter, for by the optical signal of different downstream wavelength together, to be supplied to this wavelength division multiplexing unit.
14. optical line terminals according to claim 10, is characterized in that, also comprise as lower component:
-main control unit, for determining and sending schedule information to each optical network unit, this schedule information indicates the time slot that each optical network unit sends this upstream data and mutual communication information place, and receives the time slot at this mutual communication information place.
15. optical line terminals according to claim 14, is characterized in that, described main control unit also for:
Receive the demand signalling from optical network unit, these other optical network units of demand signalling request communicate with this optical network unit;
This demand signalling is transmitted to these other optical network units;
Receive the acknowledge message from these other optical network units;
This acknowledge message is forwarded back to this optical network unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310210219.XA CN104218997B (en) | 2013-05-30 | 2013-05-30 | Optical network unit and optical link terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310210219.XA CN104218997B (en) | 2013-05-30 | 2013-05-30 | Optical network unit and optical link terminal |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104218997A true CN104218997A (en) | 2014-12-17 |
| CN104218997B CN104218997B (en) | 2017-02-08 |
Family
ID=52100173
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310210219.XA Active CN104218997B (en) | 2013-05-30 | 2013-05-30 | Optical network unit and optical link terminal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104218997B (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016095409A1 (en) * | 2014-12-19 | 2016-06-23 | 中兴通讯股份有限公司 | Communication method, device and system for ofdm-pon |
| CN106792281A (en) * | 2015-11-20 | 2017-05-31 | 上海贝尔股份有限公司 | 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 |
| CN111247466A (en) * | 2018-01-30 | 2020-06-05 | 华为技术有限公司 | Dynamic monitoring and calibration of nodes in an optical network 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 |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4388556B2 (en) * | 2007-01-09 | 2009-12-24 | 株式会社日立コミュニケーションテクノロジー | Passive optical network system and wavelength allocation method |
| CN102523039B (en) * | 2011-12-27 | 2014-07-30 | 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 |
| WO2014063349A1 (en) * | 2012-10-26 | 2014-05-01 | 华为技术有限公司 | Passive optical network communication method and system, and optical line terminal |
-
2013
- 2013-05-30 CN CN201310210219.XA patent/CN104218997B/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016095409A1 (en) * | 2014-12-19 | 2016-06-23 | 中兴通讯股份有限公司 | Communication method, device and system for ofdm-pon |
| CN106792281A (en) * | 2015-11-20 | 2017-05-31 | 上海贝尔股份有限公司 | 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 |
| CN111247466A (en) * | 2018-01-30 | 2020-06-05 | 华为技术有限公司 | Dynamic monitoring and calibration of nodes in an optical network device |
| CN111247466B (en) * | 2018-01-30 | 2024-03-26 | 华为技术有限公司 | Dynamic monitoring and calibration of nodes in an optical network 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104218997B (en) | 2017-02-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101114885B (en) | Wavelength-division and time division multiplex mixing passive optical network system, terminal and signal transmission method | |
| Bock et al. | Hybrid WDM/TDM PON using the AWG FSR and featuring centralized light generation and dynamic bandwidth allocation | |
| CN1108724C (en) | Optical telecommunications network | |
| CN101346006B (en) | Radio frequency passive optical network with broadband wireless and optical transmission amalgamation access | |
| KR101393623B1 (en) | Communication system and method for directly transmitting signals between nodes of a communication system | |
| JP2818481B2 (en) | Asynchronous time division multiplex optical communication system | |
| EP1887724A1 (en) | A wavelength division multiplexing passive optical network and its implement method | |
| CN104218997A (en) | Optical network unit and optical link terminal | |
| US8588608B2 (en) | Method for managing the connection in an optical access network, corresponding platform, central office, and computer program product | |
| CN111355554A (en) | Route multiplexer, route multiplexing method, wavelength division routing method and network system | |
| CN101729146A (en) | Self-excitation multi-wavelength dynamically dispatched optical network unit in passive optical network | |
| CN102695101A (en) | Passive optical network over wavelength division multiplexing | |
| TW201513586A (en) | ONU and remote node for supporting inter-ONU internetworking | |
| Garg et al. | Dedicated and broadcasting downstream transmission with energy-efficient and latency-aware ONU interconnection in WDM-PON for smart cities | |
| CN101471730B (en) | Optical fiber wideband access system and optical network unit based on WDM structure | |
| CN108512623B (en) | Quantum channel and classical channel composite fiber QKD system and transmission method thereof | |
| CN102064904B (en) | Service transmission method, system and device of multi-service shared optical distribution network (ODN) | |
| Yin et al. | A novel quasi-passive, software-defined, and energy efficient optical access network for adaptive intra-PON flow transmission | |
| CN104022831B (en) | Optical and wireless convergence access network based on periodic array waveguide grating | |
| CN103516433B (en) | A kind of photoelectricity optical repeater, length are away from box and the processing method to upper and lower traveling optical signal | |
| CN102256186A (en) | Optical module of novel passive optical network | |
| CN201821465U (en) | Optical module of hybrid multiplexing passive optical network | |
| CN104768086B (en) | The method and device of optical network unit intercommunication | |
| CN103916206A (en) | Double-WDM-PON network architecture with mutual protection mechanism and method thereof | |
| CN105307057A (en) | Device for supporting ONU inter-station communication in PON system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 201206 Shanghai, Pudong Jinqiao Ning Bridge Road, No. 388, No. Patentee after: Shanghai NOKIA Baer Limited by Share Ltd Address before: 201206 Shanghai, Pudong Jinqiao Ning Bridge Road, No. 388, No. Patentee before: Shanghai Alcatel-Lucent Co., Ltd. |