CN102143059A - Uplink broadband allocation method, system and equipment for 10G Ethernet passive optical network (EPON) - Google Patents
Uplink broadband allocation method, system and equipment for 10G Ethernet passive optical network (EPON) Download PDFInfo
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Abstract
The embodiment of the invention provides an uplink broadband allocation method, system and equipment for a 10G Ethernet passive optical network (EPON). The method comprises the following steps: judging whether the uplink wavelengths of a first optical network unit and a second optical network unit which have different uplink data rates are overlapped; if no, allocating wavelength division multiplexing bandwidths for the first optical network unit and the second optical network unit so that an uplink signal is sent between the first optical network unit and the second optical network unit in a wavelength division multiplexing mode; and if yes, allocating time division multiplex bandwidths for the first optical network unit and the second optical network unit, so that the uplink signal is sent between the first optical network unit and the second optical network unit in a time division multiplexing mode. In the embodiment of the invention, the uplink bandwidth is fully utilized, thus the uplink transmission capacity of the system is improved, and the utilization of the uplink bandwidth is improved.
Description
Technical field
The present invention relates to passive optical network technique, especially, relate to the uplink bandwidth allocation mthods, systems and devices of a kind of ten thousand mbit ethernet EPONs (10G Ethernet Passive Optical Network, 10G EPON).
Background technology
EPON generally includes at least one optical line terminal (the Optical Line Terminal that is positioned at local side, OLT), a plurality of optical network unit (Optical Network Unit that are positioned at far-end, ONU) and be arranged on be used between described OLT and the described ONU to distribute/Optical Distribution Network of multiplex data (Optical Distribution Network, ODN).Realize that by described ODN point connects to multiple spot between wherein said OLT and the described ONU, so that described a plurality of ONU shares transmission line, wherein, the light signal of propagating from OLT to the ONU direction is the down link direction, adopts broadcast mode to transmit data; The light signal of propagating from ONU to the OLT direction is a uplink direction.
Ten thousand mbit ethernet EPONs (10G EPON) are the next generation that comes from traditional Ethernet passive optical network (EPON) system evolved two-forty (data rate of the 10G) passive optical networks based on Ethernet, the access that it can support polytype optical network unit comprises that to data rate in the traditional E PON system be the compatibility of the optical network unit of 1G.Particularly, the local side OLT of 10G EPON system not only can support the up-downgoing data rate to be the access of the symmetric form 10G EPON ONU of 10G, can also support the up-downgoing data rate to be respectively the access of the asymmetric 10G EPON ONU of 1G and 10G, and this local side OLT can also support the up-downgoing data rate to be the access of ONU of the traditional E PON of 1G.For ease of describing, below be that the ONU (ONU that comprises asymmetric 10G EPON ONU and traditional E PON) of 1G is designated as 1G ONU, and be that the ONU (being symmetric form 10G EPON ONU) of 10G is designated as 10G ONU upstream data with upstream data rate.Wherein, the wave-length coverage of 1G ONU upward signal is 1260nm～1360nm, and centre wavelength is 1310nm; The wave-length coverage of the upward signal of 10G ONU is 1260nm～1280nm, and centre wavelength is 1270nm.
Existing 10G EPON system is owing to considered compatibility to traditional E PON ONU, therefore on uplink direction, 10G ONU and 1G ONU are the time division multiplexing (TDM of its distribution according to local side OLT, Time Division Multiplexing) bandwidth, adopt the communication mode of TDM to send upstream data, being that synchronization has only an ONU to go up a data, might be 10G, also might be 1G.Yet, owing to adopted time-multiplexed communication mode, the upstream channel bandwidth of existing 10G EPON system will seriously be limited by traditional EPON ONU and asymmetric 10G EPON ONU, can't really realize the high bandwidth of up 10G, thereby cause the upstream channel bandwidth utilance of existing 10G EPON system low.
Summary of the invention
The embodiment of the invention is the low problem of upstream channel bandwidth utilance of the 10G EPON system of solution prior art, and uplink bandwidth allocation method and a kind of 10G EPON system and the device with high bandwidth utilization of a kind of 10G EPON is provided.
For achieving the above object, the embodiment of the invention at first provides the uplink bandwidth allocation method of a kind of 10G EPON system, and this method comprises: whether the up wavelength of judging first optical network unit that upstream data rate is different and second optical network unit is overlapping; According to judged result is that described first optical network unit and described second optical network unit distribute upstream bandwidth; Wherein, if the up wavelength of described first optical network unit and described second optical network unit is not overlapping, for described first optical network unit and described second optical network unit distribution wavelength division multiplexing bandwidth, so that adopt wave division multiplex mode to send upward signal between described first optical network unit and described second optical network unit; If the up wavelength of described first optical network unit and described second optical network unit is overlapping, for described first optical network unit and described second optical network unit distribution time division multiplexing bandwidth, so that adopt time division multiplexing mode to send upward signal between described first optical network unit and described second optical network unit.
The embodiment of the invention also provides a kind of optical line terminal, and it comprises: the wavelength judging unit is used to judge whether the up wavelength of first optical network unit that upstream rate is different and second optical network unit is overlapping; The allocated bandwidth unit, the judged result that is used for according to the wavelength judging unit is that described first optical network unit and described second optical network unit distribute upstream bandwidth; Wherein, described allocated bandwidth unit goes out the up wavelength of described first optical network unit and described second optical network unit when not overlapping in described wavelength judgment unit judges, for described first optical network unit and described second optical network unit distribute the wavelength division multiplexing bandwidth so that adopt wave division multiplex mode to send upward signal between described first optical network unit and described second optical network unit; Go out the up wavelength of described first optical network unit and described second optical network unit when overlapping in described wavelength judgment unit judges, for described first optical network unit and described second optical network unit distribute the time division multiplexing bandwidth so that adopt time division multiplexing mode to send upward signal between described first optical network unit and described second optical network unit.
The embodiment of the invention also provides a kind of multi-plexing light accessing system, and it comprises local side apparatus and a plurality of remote equipment, and wherein said local side apparatus is coupled to described a plurality of remote equipment by the mode of putting multiple spot; Described a plurality of remote equipment comprises first remote equipment and second remote equipment that upstream data rate is different, and it is respectively applied for to described local side apparatus and sends first upward signal and second upward signal; Described local side apparatus is used for judging whether the up wavelength of described first remote equipment and described second remote equipment is overlapping; And be that described first remote equipment and described second remote equipment distribute the wavelength-division multiplex bandwidth so that adopt wave division multiplex mode to send described first upward signal and described second upward signal between described first remote equipment and described second remote equipment when up wavelength is not overlapping, and be that described first remote equipment and described second remote equipment distribute the time division multiplex bandwidth so that adopt time division multiplexing mode to send described first upward signal and described second upward signal between described first remote equipment and described second remote equipment when up wavelength is overlapping.
The embodiment of the invention is carried out allocated bandwidth according between different first optical network unit of upstream data rate and second optical network unit whether the overlapping judged result of wavelength taking place, when up wavelength is not overlapping, distribute the wavelength division multiplexing bandwidth so that first optical network unit and second optical network unit adopt wave division multiplex mode to send upward signal, divide multiplexing bandwidth so that first optical network unit and second optical network unit adopt time division multiplexing mode to send upward signal in the overlapping time-division timing of up wavelength.By above-described allocated bandwidth mode, the embodiment of the invention can utilize wave division multiplex mode to make full use of the high bandwidth of up link, improves the uplink capacity of system greatly, thereby improves the upstream bandwidth utilance.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, does not constitute limitation of the invention.In the accompanying drawings:
Fig. 1 is the structural representation of 10G EPON system;
Fig. 2 is the flow chart of uplink bandwidth allocation method of the 10G EPON system of the embodiment of the invention;
Fig. 3 is the schematic flow sheet of the step of judging in the method shown in Figure 2 that wavelength is whether overlapping;
Fig. 4 is the structural representation of optical module of the optical line terminal of the embodiment of the invention;
The transmission schematic diagram of upward signal when Fig. 5 is the employing time division multiplexing of the embodiment of the invention and wavelength division multiplexing;
Fig. 6 is the transmission schematic diagram of the employing sign back upward signal of the embodiment of the invention;
Fig. 7 is the structural representation of the optical line terminal of the embodiment of the invention;
Fig. 8 is the structural representation of the wavelength judging unit of optical line terminal shown in Figure 7.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, the embodiment of the invention is described in further detail below in conjunction with accompanying drawing.At this, illustrative examples of the present invention and explanation thereof are used to explain the present invention, but not as a limitation of the invention.
See also Fig. 1, it is the structural representation of 10G EPON system.Described 10G EPON system is the multi-plexing light accessing system of a kind of point to multiple spot, can have the framework as IEEE 802.3av standard definition, and the full content of described IEEE 802.3av standard is combined in present specification by reference.Particularly, described 10G EPON system can comprise at least one optical line terminal (OLT) of being positioned at local side, a plurality of be positioned at the optical network unit (ONU) of far-end and be arranged on described optical line terminal and described optical network unit between be used to distribute/Optical Distribution Network (ODN) of multiplex data.Wherein, described optical line terminal can be the optical line terminal of 10G EPON standard definition, be 10G EPON OLT, it is connected to described a plurality of optical network unit by described Optical Distribution Network in the mode of putting multiple spot, and described Optical Distribution Network is realized the distribution of data/multiplexing by Passive Optical Components (such as optical splitter).Wherein, direction from described optical line terminal to described optical network unit is a down direction, and the direction from described optical network unit to described optical line terminal is a up direction, adopt broadcast mode to transmit downlink data at the described optical line terminal of down direction, and at up direction, described optical network unit transmits upstream data to described optical line terminal within the bandwidth that described optical line terminal distributes.
Described a plurality of optical network unit can comprise the optical network unit of number of different types, such as, in specific embodiment, it can comprise that the up-downgoing data rate is the optical network unit of the traditional E PON of 1G (being traditional EPON ONU), the up-downgoing data rate is the symmetric form 10G EPON optical network unit (being symmetric form 10G EPON ONU) of 10G and the asymmetric 10G EPON optical network unit (being asymmetric 10G EPON ONU) that the up-downgoing data rate is respectively 1G and 10G.For ease of describing, below be the unified 1G ONU that is called of optical network unit (ONU that comprises asymmetric 10G EPON ONU and traditional E PON) of 1G, and the uplink optical signal of the data rate with 1G of its transmission is called the 1G upward signal upstream data rate; And be that the optical network unit (being symmetric form 10G EPON ONU) of 10G is called 10G ONU, and the uplink optical signal of the data rate with 10G of its transmission is called the 10G upward signal with upstream data.Wherein, described 1G ONU can adopt distributed Fabry-Perot (Fabry Perot, FP) laser sends described 1G upward signal, and the wave-length coverage of described 1G upward signal can be 1260nm～1360nm, centre wavelength is 1310nm; And described 10G ONU can adopt distributed Feedback (Distributed Feedback, DFB) laser sends described 10G upward signal, and the wave-length coverage of described 10G upward signal can be 1260nm～1280nm, centre wavelength is 1270nm.
The embodiment of the invention provides the uplink bandwidth allocation method of a kind of 10G EPON system, and as shown in Figure 2, this method can comprise:
In specific embodiment, before carrying out above-mentioned uplink bandwidth allocation method, the optical line terminal of local side can be described in advance far-end is linked into described optical line terminal in the 10G EPON system all optical network units carry out feature identification, such as it being carried out wavelength characteristic identification or rate feature identification, be linked into the type of the optical network unit of described optical line terminal to judge far-end.
If judging the optical network unit that far-end is linked into described optical line terminal by above-mentioned feature identification has only 1G ONU or has only 10G ONU, for avoiding between a plurality of 1G ONU or the wavelength conflict taking place between a plurality of 10G ONU, then the optical line terminal of described local side can determine only to be the optical network unit distribution time division multiplexing bandwidth of described far-end, so that described a plurality of 1G ONU or described a plurality of 10G ONU send 1G upward signal or 10G upward signal respectively by time division multiplexing mode.
Not only comprise 1G ONU but also comprise 10G ONU if judge the optical network unit that far-end is linked into described optical line terminal by above-mentioned feature identification, then the optical line terminal of described local side can be carried out above-mentioned steps 101, judges promptly whether the up wavelength of described 1G ONU and described 10G ONU is overlapping.
Particularly, can be that all 1G ONU and the 10G ONU that is linked into described optical line terminal judges one by one about whether the overlapping judgement of wavelength taking place in the above-mentioned steps 101, and the record result.
See also Fig. 3, its for the embodiment of the invention about whether the schematic diagram of the overlapping judgement of wavelength takes place, G1-Gm represents m 10G ONU of described 10G EPON system respectively among Fig. 3, and T1-Tn represents n 1G ONU of described 10G EPON system respectively.Particularly, at first choose one of them 10G ONU, and described 10G ONU and a 1G ONU are carried out the overlapping judgement of wavelength, and the record judged result; Then, described 10G ONU and next 1G ONU are carried out overlapping judgement of wavelength and record judged result, by that analogy, carry out the overlapping judgement of wavelength seriatim until described 10G ONU and all 1G ONU.After this, choose another 10G ONU and itself and all 1G ONU are carried out overlapping judgement of wavelength and record judged result seriatim again; Finally, just can with between all 1G ONU and all 10G ONU all two two places carry out the overlapping judgement of wavelength, the optical line terminal of described local side and record the overlapping judgement information of wavelength of all optical network units thus.
Alternatively, see also Fig. 3, above-mentioned about whether taking place in the overlapping deterministic process of wavelength, for the overlapping deterministic process of wavelength between one of them 1G ONU and the 10G ONU, can be as described below:
At first, the optical line terminal of local side is that described 1G ONU and described 10G ONU distribute same bandwidth, so that described 1G ONU and described 10G ONU send upward signal to described optical line terminal in the window at one time simultaneously, 1G upward signal and 10G upward signal that described 1G ONU and described 10G ONU send are sent to described optical line terminal by described Optical Distribution Network;
Secondly, described optical line terminal judges whether correctly to receive the upward signal from described 1G ONU and described 10G ONU, promptly described 1G upward signal and 10G upward signal in described time window; If described optical line terminal is judged the 10G upward signal that 1G upward signal that described 1G ONU sends and described 10G ONU send and all can correctly be received, then it can confirm that the wavelength between the upward signal of described 1G ONU and described 10G ONU is not overlapping; If can not correctly be received, then described optical line terminal can confirm that the wavelength between the upward signal of described 1G ONU and described 10G ONU is overlapping.
The principle that above-mentioned deterministic process is concrete is: suppose occurring overlapping from the 1G upward signal of optical network unit at remote side and the wavelength of 10G upward signal in the window at the same time, then in described 1G upward signal in described time window and described 10G upward signal meeting mutual interference mutually, thereby cause described optical line terminal described 1G upward signal and described 10G upward signal correctly can't be discerned and parsed from the signal that receives in described time window, thus, described optical line terminal can judge that just the upgoing wave long hair of this moment described 1G ONU and described 10G ONU gives birth to overlapping.On the contrary, if both up wavelength do not have overlapping, described 1G ONU and described 10G ONU send in window at the same time between described optical line terminal 1G upward signal and the 10G upward signal not can the phase mutual interference, then described optical line terminal just can all correctly be discerned described 1G upward signal and described 10G upward signal and parse, so it is not overlapping just can to judge both up wavelength.
Particularly, for realizing above-mentionedly whether the overlapping judgement of wavelength taking place about 1G ONU and 10G ONU, the optical module of described optical line terminal can dispose a up reception path of 1G and the up reception path of 10G, wherein the two is respectively applied for and receives 1G upward signal and 10G upward signal, and the two permission receiver wavelength range that sets in advance corresponds respectively to the wave-length coverage of above-mentioned 1G upward signal and 10G upward signal.In specific embodiment, by configuration permission receiver wavelength range can be so that do not taking place under the overlapping situation of wavelength respectively, 1G upward signal and 10G upward signal from optical network unit at remote side within window at the same time can be received and be sent to data processing module by up reception path of described 1G and the up reception path of described 10G respectively, (Media Access Control, MAC) module is carried out dissection process such as the medium access control.
By above-mentioned steps 101 judge whether take place between described 1G ONU and the described 10G ONU wavelength overlapping and the record judged result after, described optical line terminal also can carry out the allocated bandwidth of step 102 and step 103 according to described judged result, for nonoverlapping 1G ONU of up wavelength and 10G ONU, described optical line terminal just can be it and distributes the wavelength division multiplexing bandwidth, so that it adopts wave division multiplex mode to send upward signal, and give birth to overlapping 1G ONU and 10G ONU for the upgoing wave long hair, described optical line terminal just can be it and distributes the time division multiplexing bandwidth, so that it adopts time division multiplexing mode to send upward signal.By above-described allocated bandwidth mode, the embodiment of the invention can utilize wave division multiplex mode to make full use of the high bandwidth of 10G up link, improves the uplink capacity of described 10G EPON system greatly, thereby improves the upstream bandwidth utilance.
In the present embodiment, overlapping judged result is after 1GONU in the described 10G EPON system and 10G ONU distribute wavelength division multiplexing bandwidth or time division multiplexing bandwidth according to wavelength at described optical line terminal, the 1G ONU of far-end and 10G ONU can be according to the bandwidth of described optical line terminal distribution, adopt the mode of time division multiplexing or wavelength division multiplexing to send 1G upward signal and 10G upward signal to described optical line terminal respectively, described thus optical line terminal just can receive the upward signal of described 1G ONU and described 10GONU transmission and handle.
See also Fig. 4, the optical module structural representation of the optical line terminal that it provides for the embodiment of the invention.Described optical module can comprise: optical splitter 201, the first up reception path 202 and the second up reception path 203; Wherein, the first up reception path 202 can comprise photodiode 2021, trans-impedance amplifier 2022, low pass filter 2023 and the limiting amplifier 2024 that connects successively; The described second up reception path 202 can comprise filter plate 2031, photodiode 2032, trans-impedance amplifier 2033 and the limiting amplifier 2034 that connects successively.
In the present embodiment, the described first up reception path 202 can receive path for the 1G upward signal, it is used to receive the 1G upward signal from the 1G ONU transmission of far-end, and low-pass filter configured 2023 is used for the 10G upward signal of filtering from the 10G ONU transmission of far-end in the described first up reception path 202.
The described second up reception path 203 can receive path for the 10G upward signal, it is used to receive the 10G upward signal from the 10GONU transmission of far-end, to be used to make wave-length coverage be that 1260 to 1280nm upward signal passes through to the filter plate 2031 of configuration in the described first up reception path 202, and the filtering wave-length coverage is 1280 to 1360nm upward signal.
In the present embodiment, on the one hand, under the situation that the wavelength of the 1G of far-end ONU and 10G ONU overlaps, the wavelength division multiplexing bandwidth that described 1G ONU and 10G ONU distribute according to described optical line terminal, send 1G upward signal and 10G upward signal by wave division multiplex mode to described optical line terminal, described optical line terminal can receive the 1G upward signal and the 10G upward signal of described 1G ONU and 10G ONU transmission by described optical module.
Particularly, optical splitter 201 can be divided into two-way with upward signal (comprising the 1G upward signal of 1G ONU transmission and the 10G upward signal that 10G ONU sends), be the first via upward signal and the second road upward signal, and send the described first up reception path 202 and the described second up reception path 203 respectively to.Wherein, each road upward signal is the mixed wavelengths signal, and it comprises that 1G upward signal and 10G upward signal distinguish two kinds of corresponding wavelength.
At the described second up reception path 203, because the wavelength of the 10G upward signal that the wavelength of the 1G upward signal that 1G ONU sends and 10G ONU send is not overlapping, when described the second road upward signal during through described filter plate 2031, the 1G upward signal that described 1G ONU sends filters out filtered 2031, and the 10G upward signal that therefore has only described 10G ONU to send can be by filter plate 2031 and by 203 correct receptions of the described second up reception path.
At the described first up reception path 202, two kinds of upward signals that described the second road upward signal comprises (being 1G upward signal and 10G upward signal) can both carry out opto-electronic conversion by photodiode 2021, and process trans-impedance amplifier 2022 carries out after the preposition amplification, the 10G upward signal that wherein said 10G ONU sends is low pass filtering 2023 filterings of device, the 1G upward signal that has only 1G ONU to send passes through, and the described thus first up reception path 202 just can be realized the correct reception to the 1G upward signal of described 1G ONU transmission.
In the present embodiment, on the other hand, under the situation that the wavelength of the 1G of far-end ONU and 10G ONU overlaps, the time division multiplexing bandwidth that described 1G ONU and 10G ONU distribute according to described optical line terminal, when described optical line terminal sent 1G upward signal and 10G upward signal, described optical line terminal can receive the 1G upward signal and the 10G upward signal of described 1G ONU and 10G ONU transmission equally by described optical module by time division multiplexing mode.
Particularly, the upward signal that receives when the described optical line terminal of certain time slot be described 10G ONU send the 10G upward signal time, optical splitter 201 can be divided into described 10G upward signal two-way and send into the described first up reception path 202 and the described second up reception path 203 respectively.Because the described first up reception path 202 is provided with described low pass filter 2023, it can filter out the 10G upward signal that enters the described first up reception path 202, therefore, the 10G upward signal that only enters the described second up reception path 203 can be received by the optical module of described optical line terminal, and described optical module can be further send the MAC module to the 10G upward signal that the described second up reception path 203 is received and handles.In fact, what distribute is the time division multiplexing bandwidth because described optical line terminal is described 10G ONU, therefore the MAC module of described optical line terminal itself knows that also the upward signal that receives in the crack at this moment has only the 10G upward signal, and therefore described MAC module also only can remove to extract the upward signal that the described second up reception path 203 receives.
The upward signal that receives when the described optical line terminal of certain time slot be described 1G ONU send the 1G upward signal time, optical splitter 201 can be divided into described 1G upward signal two-way equally and send into the described first up reception path 202 and the described second up reception path 203 respectively.What distribute is the time division multiplexing bandwidth because described optical line terminal is described 1G ONU, therefore the MAC module of described optical line terminal itself knows that the upward signal that receives in the crack at this moment has only the 1G upward signal, and therefore described MAC module also only can remove to extract the upward signal that the described first up reception path 202 receives.
This shows, by optical module structure shown in Figure 4, no matter 1G upward signal and 10G upward signal that described 1G ONU and described 10G ONU send are to send described optical line terminal to by time division multiplexing mode, still adopt wave division multiplex mode to send described optical line terminal to, described optical line terminal all can correctly receive the 1G upward signal and the 10G upward signal of described 1G ONU and described 10G ONU transmission.
Be to be understood that, in described 10G EPON system, because the optical network unit of far-end includes a plurality of 1G ONU and a plurality of 10G ONU, therefore described optical module both may receive 1G upward signal and the 10G upward signal that transmits by time division multiplexing mode, also may receive the 1G upward signal and the 10G upward signal that transmit by wavelength division multiplexing.Fig. 5 adopts the transmission schematic diagram of the upward signal of time division multiplexing mode and wave division multiplex mode transmission for the embodiment of the invention.As shown in Figure 5, at synchronization, described optical line terminal can only receive 1G upward signal or 10G upward signal (being that described 1G upward signal and 10G upward signal adopt time division multiplexing mode to transmit), can also receive 1G upward signal and 10G upward signal (being that described 1G upward signal and 10G upward signal adopt wave division multiplex mode to transmit) simultaneously
Further, in order further to improve the efficient of transmission, in embodiments of the present invention, after finishing about the overlapping judgement of the wavelength of 1G ONU and 10GONU, described optical line terminal can be to identifying with the nonoverlapping 1G ONU of the wavelength of 10G ONU, such as stamping label (TAG) to it.And described optical line terminal can be for distributing same bandwidth with the nonoverlapping 10G ONU of this described 1G ONU wavelength, so that the two can send upward signal by wavelength division multiplexing when distributing upstream bandwidth for the 1G ONU that stamps sign.
For example, suppose that A is that 1G ONU, B are 10G ONU, and the wavelength of A and B is not overlapping, then described optical line terminal can identify A.According to described sign, described optical line terminal can be preferably described 1G ONU and distribute bandwidth, and if at T constantly, described optical line terminal is that A has distributed bandwidth, described optical line terminal also can be B and distributes same bandwidth, so that A and the B mode by wavelength division multiplexing sends upward signal.
Fig. 6 is for adopting the transmission schematic diagram of sign back upward signal.As shown in Figure 6, can preferentially guarantee the transmission of the upward signal of 1G ONU, and, the upward signal of the 1G ONU after the sign (1G is up ') can with the upward signal wavelength division multiplexing of 10G ONU.Thus, the embodiment of the invention can further realize the priority scheduling of the optical line terminal of local side to the optical network unit of far-end, improves the efficient of transmission.
Up link Wavelength allocation method based on the described 10G EPON of above embodiment system, the embodiment of the invention also provides a kind of optical line terminal, it can be applicable to 10G EPON system, uplink bandwidth allocation device as 10G EPON system, as shown in Figure 7, this optical line terminal can comprise: wavelength judging unit 501 and allocated bandwidth unit 502; Wherein,
Allocated bandwidth unit 502, the judged result that is used for according to wavelength judging unit 501 is that described first optical network unit and described second optical network unit distribute upstream bandwidth.
In specific embodiment, the up wavelength of described first optical network unit and described second optical network unit can be judged when not overlapping at described wavelength judging unit 501 in described allocated bandwidth unit 502, for described first optical network unit and described second optical network unit distribute the wavelength division multiplexing bandwidth so that adopt wave division multiplex mode to send upward signal between described first optical network unit and described second optical network unit; Judge the up wavelength of described first optical network unit and described second optical network unit when overlapping at described wavelength judging unit 501, for described first optical network unit and described second optical network unit distribute the time division multiplexing bandwidth so that adopt time division multiplexing mode to send upward signal between described first optical network unit and described second optical network unit.
Particularly, as shown in Figure 8, wavelength judging unit 501 can comprise: preassignment unit 601, signal judging unit 602 and determining unit 603; Wherein,
Preassignment unit 601 is used to described first optical network unit and described second optical network unit to distribute same bandwidth, sends the first different upward signal of data rate and second upward signal respectively in the window to authorize described first optical network unit at one time with described second optical network unit;
Signal judging unit 602 is used to judge can correctly receives second upward signal that first upward signal that described first optical network unit sends and described second optical network unit send in described time window;
Determining unit 603 is used for judged result at described signal judging unit 602 for to determine that the up wavelength of described first optical network unit and described second optical network unit is not overlapping in the time of can correctly receiving, in the judged result of described signal judging unit 602 for to determine that the up wavelength of described first optical network unit and described second optical network unit is overlapping in the time of can not correctly receiving.
Please consult Fig. 7 again, in one embodiment, described optical line terminal can also comprise and receive optical module 504, its be used to receive by wave division multiplex mode or time division multiplexing mode transmit from first upward signal of described first optical network unit with from second upward signal of second optical network unit.
In specific embodiment, the structure of described reception optical module 504 is passable, as shown in Figure 4, particularly, sees also Fig. 4, and described reception optical module 504 can comprise: optical splitter 201, the first up reception path 202 and the second up reception path 203;
It is used for optical splitter 201 carrying out light-splitting processing with what adopt the transmission of wave division multiplex mode or time division multiplexing mode from first upward signal of described first optical network unit with from second upward signal of second optical network unit, to generate the first via upward signal and the second road upward signal, and respectively described first via upward signal and described the second road upward signal are offered the described first up reception path 202 and the second up reception path 203 and, the described first up reception path 202 can be corresponding with the upstream data rate of described first optical network unit, and the described second up reception path 202 can be corresponding with the upstream data rate of described second optical network unit, the wherein said first up reception path 202 is used to receive first upward signal of described first optical network unit transmission and second upward signal that described second optical network unit of filtering sends, and the described second up reception path 203 is used to receive second upward signal of described second optical network unit transmission and first upward signal that described first optical network unit of filtering sends.
Wherein, the described first up reception path 202 comprises photodiode 2021, trans-impedance amplifier 2022, low pass filter 2023 and the limiting amplifier 2024 that connects successively, and described low pass filter 2023 is used for second upward signal from described second optical network unit;
The described first up reception path 203 comprises filter plate 2031, photodiode 2032, trans-impedance amplifier 2033 and the limiting amplifier 2034 that connects successively; Described filter plate 2031 is used to allow the corresponding to light signal of up wave-length coverage with described second optical network unit to pass through, and other wave-length coverage light signals of filtering, such as, making wave-length coverage is that 1260 to 1280nm light signal passes through, and the filtering wave-length coverage is 1280 to 1360nm light signal.
The concrete course of work of above-mentioned reception optical module 504 can be consulted the description of above embodiment, below is not giving unnecessary details.
And in one embodiment, as shown in Figure 7, described optical line terminal can also comprise: identify unit 505 is used for identifying with nonoverlapping first optical network unit of the up wavelength of described second optical network unit; And, described allocated bandwidth unit 502 is when distributing upstream bandwidth for first optical network unit after the sign, for distributing same bandwidth, send upward signal at synchronization to authorize described first optical network unit and described second optical network unit with nonoverlapping second optical network unit of the up wavelength of described first optical network unit.
Each part of the device of present embodiment is respectively applied for each step of the method that realizes previous embodiment, owing in method embodiment, each step is had been described in detail, does not repeat them here.
Those of ordinary skills can also further recognize, the unit and the algorithm steps of each example of describing in conjunction with embodiment disclosed herein, can realize with electronic hardware, computer software or the combination of the two, for the interchangeability of hardware and software clearly is described, the composition and the step of each example described prevailingly according to function in the above description.These functions still are that software mode is carried out with hardware actually, depend on the application-specific and the design constraint of technical scheme.The professional and technical personnel can use distinct methods to realize described function to each specific should being used for, but this realization should not thought and exceeds scope of the present invention.
The method of describing in conjunction with embodiment disclosed herein or the step of algorithm can use the software module of hardware, processor execution, and perhaps the combination of the two is implemented.Software module can place the storage medium of any other form known in random asccess memory (RAM), internal memory, read-only memory (ROM), electrically programmable ROM, electrically erasable ROM, register, hard disk, moveable magnetic disc, CD-ROM or the technical field.
Above-described embodiment; purpose of the present invention, technical scheme and beneficial effect are further described; institute is understood that; the above only is the specific embodiment of the present invention; and be not intended to limit the scope of the invention; within the spirit and principles in the present invention all, any modification of being made, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (14)
1. the uplink bandwidth allocation method of a 10G EPON is characterized in that, described method comprises:
Whether the up wavelength of judging first optical network unit that upstream data rate is different and second optical network unit is overlapping;
According to judged result is that described first optical network unit and described second optical network unit distribute upstream bandwidth;
Wherein, if the up wavelength of described first optical network unit and described second optical network unit is not overlapping, for described first optical network unit and described second optical network unit distribution wavelength division multiplexing bandwidth, so that adopt wave division multiplex mode to send upward signal between described first optical network unit and described second optical network unit; If the up wavelength of described first optical network unit and described second optical network unit is overlapping, for described first optical network unit and described second optical network unit distribution time division multiplexing bandwidth, so that adopt time division multiplexing mode to send upward signal between described first optical network unit and described second optical network unit.
2. method according to claim 1 is characterized in that, whether the described up wavelength of judging first optical network unit that upstream data rate is different and second optical network unit overlapping comprising:
For described first optical network unit and described second optical network unit distribute same bandwidth, to authorize described first optical network unit and described second optical network unit to send first upward signal and second upward signal respectively in the window at one time, wherein said first upward signal is different with the data rate of described second upward signal;
In described time window, judge whether correctly to receive first upward signal of described first optical network unit transmission and second upward signal that described second optical network unit sends;
If can correctly receive, the up wavelength of judging described first optical network unit and described second optical network unit is not overlapping; Otherwise the up wavelength of judging described first optical network unit and described second optical network unit is overlapping.
3. method according to claim 1 is characterized in that, is being that described method also comprised after described first optical network unit and described second optical network unit distributed the wavelength division multiplexing bandwidth:
That utilizes that optical splitter will adopt wave division multiplex mode transmission carries out light-splitting processing from first upward signal of described first optical network unit with from second upward signal of second optical network unit, to generate the first via upward signal and the second road upward signal, wherein every road upward signal is the mixed wavelengths signal that comprises described first upward signal and second upward signal;
Utilize the upstream data rate corresponding first up reception path with described first optical network unit to receive described first via upward signal and filtering second upward signal wherein obtaining first upward signal that described first optical network unit sends, and first upward signal that will obtain offer data processing module and carry out data processing;
Utilize the upstream data rate corresponding second up reception path with described second optical network unit to receive described the second road upward signal and filtering first upward signal wherein obtaining second upward signal that described second optical network unit sends, and second upward signal that will obtain offer data processing module and carry out data processing.
4. method according to claim 1 is characterized in that, is being that described method also comprised after described first optical network unit and described second optical network unit distributed the wavelength division multiplexing bandwidth:
That utilizes that optical splitter will adopt time division multiplexing mode transmission carries out light-splitting processing from first upward signal of described first optical network unit with from second upward signal of second optical network unit, to generate the first via upward signal and the second road upward signal, wherein every road upward signal carries described first upward signal and described second upward signal respectively at first time slot and second time slot;
At described first time slot, utilize the upstream data rate corresponding first up reception path with described first optical network unit to receive described first via upward signal, and first upward signal of described first via upward signal carrying offered according to processing module carry out data processing;
At described second time slot, utilize the upstream data rate corresponding second up reception path with described second optical network unit to receive described the second road upward signal, and second upward signal that will described the second road upward signal carries offer described data processing module and carry out data processing.
5. method according to claim 1 is characterized in that, also comprises: to identifying with nonoverlapping first optical network unit of the up wavelength of described second optical network unit;
And, when distributing upstream bandwidth for first optical network unit after the sign, for distributing same bandwidth, send upward signal at synchronization to authorize described first optical network unit and described second optical network unit with nonoverlapping second optical network unit of the up wavelength of described first optical network unit.
6. an optical line terminal is characterized in that, comprising:
The wavelength judging unit is used to judge whether the up wavelength of first optical network unit that upstream rate is different and second optical network unit is overlapping;
The allocated bandwidth unit, the judged result that is used for according to the wavelength judging unit is that described first optical network unit and described second optical network unit distribute upstream bandwidth;
Wherein, described allocated bandwidth unit goes out the up wavelength of described first optical network unit and described second optical network unit when not overlapping in described wavelength judgment unit judges, for described first optical network unit and described second optical network unit distribute the wavelength division multiplexing bandwidth so that adopt wave division multiplex mode to send upward signal between described first optical network unit and described second optical network unit; Go out the up wavelength of described first optical network unit and described second optical network unit when overlapping in described wavelength judgment unit judges, for described first optical network unit and described second optical network unit distribute the time division multiplexing bandwidth so that adopt time division multiplexing mode to send upward signal between described first optical network unit and described second optical network unit.
7. optical line terminal according to claim 6 is characterized in that, described wavelength judging unit comprises:
The preassignment unit, be used to described first optical network unit and described second optical network unit to distribute same bandwidth, send the first different upward signal of data rate and second upward signal respectively in the window at one time with described second optical network unit to authorize described first optical network unit;
Signal judging unit is used to judge correctly to receive second upward signal that first upward signal that described first optical network unit sends and described second optical network unit send in described time window;
Determining unit, be used for judged result at described signal judging unit for to determine that the up wavelength of described first optical network unit and described second optical network unit is not overlapping in the time of can correctly receiving, in the judged result of described signal judging unit for to determine that the up wavelength of described first optical network unit and described second optical network unit is overlapping in the time of can not correctly receiving.
8. optical line terminal according to claim 6, it is characterized in that, also comprise: receive optical module, its be used to receive by wave division multiplex mode or time division multiplexing mode transmit from first upward signal of described first optical network unit with from second upward signal of second optical network unit;
Wherein, described reception optical module comprise with the upstream data rate of the described first optical network unit corresponding first up reception path and with the upstream data rate of the described second optical network unit corresponding second up reception path, the described first up reception path is used to receive first upward signal of described first optical network unit transmission and second upward signal that described second optical network unit of filtering sends, and the described second up reception path is used to receive second upward signal of described second optical network unit transmission and first upward signal that described first optical network unit of filtering sends.
9. optical line terminal according to claim 8, it is characterized in that, described reception optical module also comprises optical splitter, it is used for carrying out light-splitting processing with what adopt the transmission of wave division multiplex mode or time division multiplexing mode from first upward signal of described first optical network unit with from second upward signal of second optical network unit, with the generation first via upward signal and the second road upward signal, and respectively described first via upward signal and described the second road upward signal are offered the described first up reception path and the second up reception path.
10. optical line terminal according to claim 9, it is characterized in that, the described first up reception path comprises photodiode, trans-impedance amplifier, low pass filter and the limiting amplifier that connects successively, and wherein said low pass filter is used for second upward signal of filtering from described second optical network unit;
The described second up reception path comprises filter plate, photodiode, trans-impedance amplifier and the limiting amplifier that connects successively; Described filter plate is used to allow the corresponding to light signal of up wave-length coverage with described second optical network unit to pass through, and other wave-length coverage light signals of filtering.
11. optical line terminal according to claim 6 is characterized in that, also comprises:
Identify unit is used for identifying with nonoverlapping first optical network unit of the up wavelength of described second optical network unit;
And described allocated bandwidth unit is when distributing upstream bandwidth for first optical network unit after the sign, for distributing same bandwidth, send upward signal at synchronization to authorize described first optical network unit and described second optical network unit with nonoverlapping second optical network unit of the up wavelength of described first optical network unit.
12. a multi-plexing light accessing system is characterized in that, comprises local side apparatus and a plurality of remote equipment, wherein said local side apparatus is coupled to described a plurality of remote equipment by the mode of putting multiple spot;
Described a plurality of remote equipment comprises first remote equipment and second remote equipment that upstream data rate is different, and it is respectively applied for to described local side apparatus and sends first upward signal and second upward signal;
Described local side apparatus is used for judging whether the up wavelength of described first remote equipment and described second remote equipment is overlapping; And be that described first remote equipment and described second remote equipment distribute the wavelength-division multiplex bandwidth so that adopt wave division multiplex mode to send described first upward signal and described second upward signal between described first remote equipment and described second remote equipment when up wavelength is not overlapping, and be that described first remote equipment and described second remote equipment distribute the time division multiplex bandwidth so that adopt time division multiplexing mode to send described first upward signal and described second upward signal between described first remote equipment and described second remote equipment when up wavelength is overlapping.
13. multi-plexing light accessing system according to claim 12, it is characterized in that, described remote equipment is an optical network unit, and described first remote equipment comprises that the up-downgoing data rate is the EPON optical network unit of 1G and the asymmetric 10G EPON optical network unit that the up-downgoing data rate is respectively 1G and 10G, and described second remote equipment comprises that the up-downgoing data rate is the symmetric form 10G EPON optical network unit of 10G.
14. multi-plexing light accessing system according to claim 12 is characterized in that, described local side apparatus is as each described optical line terminal in the claim 6 to 11.
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| CN201010597541.9A CN102143059B (en) | 2010-12-20 | 2010-12-20 | Uplink broadband allocation method, system and equipment for 10G Ethernet passive optical network (EPON) |
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| CN201010597541.9A CN102143059B (en) | 2010-12-20 | 2010-12-20 | Uplink broadband allocation method, system and equipment for 10G Ethernet passive optical network (EPON) |
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| WO2013120437A1 (en) * | 2012-02-13 | 2013-08-22 | 中兴通讯股份有限公司 | Route flooding method and device and path calculation method and path calculation unit |
| CN106851443A (en) * | 2017-04-18 | 2017-06-13 | 福建亿芯源半导体股份有限公司 | OLT transceiver chips |
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| CN102143059B (en) | 2014-01-01 |
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