CN103281604A - Downlink transmission method of multi-wavelength passive optical network system - Google Patents
Downlink transmission method of multi-wavelength passive optical network system Download PDFInfo
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Abstract
The invention provides a downlink transmission method of a multi-wavelength passive optical network system. The downlink transmission method of the multi-wavelength passive optical network system comprises the following steps that a multi-wavelength downlink signal from an optical line terminal is received, and first-level light splitting processing is carried out on the multi-wavelength downlink signal and then a plurality of paths of multi-wavelength downlink signals are formed; filtering processing is carried out on the paths of multi-wavelength downlink signals by means of band-pass filters with different passing bands and then a plurality of paths of single-wavelength downlink signals are formed; the paths of single-wavelength downlink signals are output to optical network units respectively after second-level light splitting processing is carried out on each path of single-wavelength downlink signal.
Description
Technical field
The present invention relates to a kind of smooth access technology, especially, relate to a kind of multi-wavelength passive optical network (Passive Optical Network, PON) downlink transmission method of system.
Background technology
Along with the continuous growth of user to bandwidth demand, traditional copper cash broadband access system more and more faces bandwidth bottleneck.Meanwhile, the increasingly mature and application cost of the Fibre Optical Communication Technology that bandwidth capacity is huge descends year by year, and the light access technology such as EPON, becomes the strong competitor of broadband access network of future generation gradually.
Traditional passive optical network, such as gigabit passive optical network (Gigabit-capable Passive Optical Network, GPON) system or Ethernet passive optical network (Ethernet Passive Optical Network, EPON) system, the general point that adopts is to multiple spot (Point to multiple point, P2MP) the network architecture, be optical line terminal (the Optical Line Terminal of central office, OLT) by Optical Distribution Network (Optical Distribution Network, ODN) with the point to the mode of multiple spot be connected to user's side a plurality of optical network units (Optical Network Unit, ONU).Wherein, at down direction, the downstream wavelength that optical line terminal adopts appointment with time division multiplexing (Time Division Multiplexing, TDM) mode is given optical network unit with downlink data transmission, each optical network unit only receives the downlink data that carries its device identification; And at up direction, optical network unit adopts the up wavelength of appointment with time division multiple access (Time Division Multiple Access, TDMA) mode is given optical line terminal with transmitting uplink data, and each optical network unit only carries out data at the time slot (Time Slot) of optical line terminal mandate and sends out.
In the multiple spot passive optical network, because optical network unit adopts time-multiplexed mode to share optical transmission medium, under the network architecture of big branching ratio, the time of time division multiplexing mode is cut apart the bandwidth that characteristic has a strong impact on optical network unit at above-mentioned traditional point.Therefore, along with the development of broadband services, traditional passive optical network can't satisfy the user to the ever-increasing demand of bandwidth.
Summary of the invention
For solving the bandwidth problem that prior art exists, the invention provides a kind of multi-wavelength passive optical network system.
The downlink transmission method of multi-wavelength passive optical network system provided by the invention comprises reception from the multi-wavelength downstream signal of optical line terminal, and described multi-wavelength downstream signal is carried out first order light-splitting processing formation multichannel multi-wavelength downstream signal; The band pass filter that utilization has different passbands carries out the filtering processing to described multichannel multi-wavelength downstream signal respectively, forms the single wavelength downstream signal of multichannel; The single wavelength downstream signal in each road is carried out second level light-splitting processing respectively, and export to optical network unit respectively.
In downlink transmission method one preferred embodiment of multi-wavelength passive optical network system provided by the invention, described multi-wavelength downstream signal carries the first downstream wavelength signal, the second downstream wavelength signal, the 3rd downstream wavelength signal and the 4th downstream wavelength signal, and described first order light-splitting processing is divided into four road multi-wavelength downstream signals with described multi-wavelength downstream signal.
In downlink transmission method one preferred embodiment of multi-wavelength passive optical network system provided by the invention, described optical line terminal comprises first optical transmitting set, second optical transmitting set, the 3rd optical transmitting set and the 4th optical transmitting set, and the described first downstream wavelength signal is launched by described optical transmitting set, the described second downstream wavelength signal is launched by described second optical transmitting set, described the 3rd downstream wavelength signal is launched by described the 3rd optical transmitting set, and described the 4th downstream wavelength signal is launched by described the 4th optical transmitting set.
In downlink transmission method one preferred embodiment of multi-wavelength passive optical network system provided by the invention, the branch optical fiber that the different branch port that described band pass filter with different passbands is serially connected in described first order optical splitter respectively connect.
In downlink transmission method one preferred embodiment of multi-wavelength passive optical network system provided by the invention, described first order optical splitter comprises first branch port, second branch port, the 3rd branch port and the 4th branch port, and the branch optical fiber that described first branch port, described second branch port, described the 3rd branch port and described the 4th branch port are connected is connected in series described first band pass filter, second band pass filter, the 3rd band pass filter and four-tape bandpass filter with different passbands respectively.
In downlink transmission method one preferred embodiment of multi-wavelength passive optical network system provided by the invention, the passband centre wavelength of described first band pass filter, described second band pass filter, described the 3rd band pass filter and described four-tape bandpass filter is respectively described first downstream wavelength, described second downstream wavelength, described the 3rd downstream wavelength and described the 4th downstream wavelength.
In the downlink transmission method of multi-wavelength passive optical network system provided by the invention, the downstream signal of optical line terminal output is the multi-wavelength downstream signal, and described multi-wavelength downstream signal adopts band pass filter to carry out the downstream wavelength separation after first order light splitting respectively, thereby realize adopting respectively many data of wavelength being carried not optical network unit on the same group respectively, thus, section just can utilize different wave length to transmit the data of a plurality of optical network units simultaneously at one time, thereby effectively the overall bandwidth of elevator system satisfies user's broadband services to the increased requirement of bandwidth.
Description of drawings
In order to be illustrated more clearly in the technical scheme in the embodiment of the invention, the accompanying drawing of required use is done to introduce simply in will describing embodiment below, apparently, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings, wherein:
Fig. 1 is the schematic diagram of a kind of preferred embodiment of multi-wavelength passive optical network system provided by the invention.
Fig. 2 is the flow chart of the downlink transmission method of multi-wavelength passive optical network system shown in Figure 1.
Embodiment
To the technical scheme in the embodiment of the invention be clearly and completely described below, obviously, described embodiment only is a part of embodiment of the present invention, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making all other embodiment that obtain under the creative work prerequisite.
See also Fig. 1, it is the schematic diagram of a kind of preferred embodiment of multi-wavelength passive optical network system provided by the invention.Described passive optical network 100 comprises at least one optical line terminal (OLT) 110, a plurality of optical network unit (ONU) 120-1～120-n and Optical Distribution Network (ODN) 130.Described optical line terminal 110 is connected to described a plurality of optical network unit 120-1～120-n by described Optical Distribution Network 130 with the form of putting multiple spot.Wherein, the direction from described optical line terminal 110 to described optical network unit 120-1～120-n is defined as down direction, and the direction from described optical network unit 120-1～120-n to described optical line terminal 110 is up direction.
Described passive optical network 100 can be the communication network of realizing the data distribution between described optical line terminal 110 and the described optical network unit 120-1～120-n without any need for active device, such as, in specific embodiment, the data distribution between described optical line terminal 110 and the described optical network unit 120-1～120-n can realize by the Passive Optical Components in the described Optical Distribution Network 130 (such as optical splitter or multiplexer).
Described optical line terminal 110 is usually located at the center, and (central office Central Office for example, CO), they can the described a plurality of optical network unit 120-1～120-n of unified management.Described optical line terminal 110 can serve as the media between described optical network unit 120-1～120-n and the upper layer network (not shown), to be forwarded to described optical network unit 120-1～120-n as downlink data from the data that described upper layer network receives, and will be forwarded to described upper layer network from the upstream data that described optical network unit 120-1～120-n receives.
Described optical network unit 120-1～120-n can be arranged on user's side position (such as user resident) by distributed earth.Described optical network unit 120-1～120-n can be the network equipment that is used for communicating with described optical line terminal 110 and user, particularly, described optical network unit 120-1～120-n can serve as the media between described optical line terminal 110 and the described user, for example, described optical network unit 120-1～120-n can be forwarded to described user with the downlink data that receives from described optical line terminal 110, and will be forwarded to described optical line terminal 110 as upstream data from the data that described user receives.Should be appreciated that the structure of described optical network unit 120-1～120-n and Optical Network Terminal (Optical Network Terminal, ONT) close, therefore in the scheme that present specification provides, can exchange between optical network unit and the Optical Network Terminal.
Described Optical Distribution Network 130 can be a data dissemination system, and it can comprise optical fiber, optical coupler, optical branching device, optical multiplexer and/or other equipment.In one embodiment, described optical fiber, optical coupler, optical branching device, optical multiplexer and/or other equipment can be Passive Optical Components, specifically, described optical fiber, optical coupler, optical branching device, optical multiplexer and/or other equipment can be that distribute data signals is the device that does not need power supply to support between described optical line terminal 110 and described optical network unit 120-1～120-n.In addition, in other embodiments, this Optical Distribution Network 130 can also comprise one or more treatment facilities, for example, and image intensifer or trunking (Relay device).In branched structure as shown in Figure 1, described Optical Distribution Network 130 specifically can extend to described a plurality of optical network unit 120-1～120-n from described optical line terminal 110, but also can be configured to other any points to the structure of multiple spot.
In multi-wavelength passive optical network system provided by the invention, described a plurality of optical network unit 120-1～120-n can be divided into many groups, and same group optical network unit adopts respectively with a pair of up-downgoing wavelength, and adopt time division multiplexing mode to carry out multiplexing; The up-downgoing wavelength difference that adopts of optical network unit on the same group not, and (Wavelength Division Multiplexing, WDM) mode is not carried out multiplexing with wavelength division multiplexing by different wave length between on the same group the optical network unit.
Such as, multi-wavelength passive optical network system 100 shown in Figure 1 can adopt four pairs of up-downgoing wavelength, for ease of describing, below described four pairs of up-downgoing wavelength are designated as the first up wavelength X u1 and the first downstream wavelength λ d1, the second up wavelength X u2 and the second downstream wavelength λ d2, the 3rd up wavelength X u3 and the 3rd downstream wavelength λ d3, the 4th up wavelength X u4 and the 4th downstream wavelength λ d4 respectively.And, described a plurality of optical network unit 120-1～120-n can be divided into four groups, wherein the up-downgoing wavelength of first group of optical network unit adopts the described first up wavelength X u1 and the first downstream wavelength λ d1 respectively, the up-downgoing wavelength of second group of optical network unit adopts the described second up wavelength X u2 and the second downstream wavelength λ d2 respectively, the up-downgoing wavelength of the 3rd group of optical network unit adopts the described the 3rd up wavelength X u3 and the 3rd downstream wavelength λ d3 respectively, and the up-downgoing wavelength of the 4th group of optical network unit adopts the described the 4th up wavelength X u4 and the 4th downstream wavelength λ d4 respectively.
Described optical line terminal 110 comprises a plurality of optical transmitting set Tx1～Tx4 and a plurality of optical receiver Rx1～Rx4, wherein said optical transmitting set Tx1～Tx4 is used for launching downlink data to described optical network unit 120-1～120-n, and the emission wavelength of described optical transmitting set Tx1～Tx4 is respectively the described first downstream wavelength λ d1, the described second downstream wavelength λ d2, described the 3rd downstream wavelength λ d3 and described the 4th downstream wavelength λ d4; Described optical receiver Rx1～Rx4 is used for receiving the upstream data from described optical network unit 120-1～120-n, and the reception wavelength of described optical receiver Rx1～Rx4 is respectively the described first up wavelength X u1, the described second up wavelength X u2, the described the 3rd up wavelength X u3 and the 4th up wavelength X u4.
Described optical transmitting set Tx1～Tx4 can be connected to optical coupler 113 by multiplexer 111, thereby described multiplexer 111 can carry out multiplexing formation multi-wavelength downstream signal with the downlink data of described optical transmitting set Tx1～Tx4 emission.Described optical receiver Rx1～Rx4 can be connected to described optical coupler 113 by demodulation multiplexer 112, and described demodulation multiplexer 112 can will be demultiplexed into described optical receiver Rx1～Rx4 respectively from described a plurality of 120-1～120-n and the upstream data that carries through described Optical Distribution Network 130 transmission multi-wavelength upward signals.Described optical coupler 113 can further be connected to Optical Distribution Network 130, described optical coupler 113 will be coupled to described Optical Distribution Network 130 from the multi-wavelength downstream signal of described multiplexer 111 on the one hand, will be coupled to described demodulation multiplexer 112 from the multi-wavelength upward signal of described Optical Distribution Network on the other hand.In specific embodiment, described optical coupler 113 can be wavelength division multiplexing (WDM) device.
Described Optical Distribution Network 130 can adopt two-stage light splitting framework, and it comprises first order optical splitter 131, second level optical splitter 132-1～132-4, upgoing wave division multiplexer 133, branch coupler 134-1～134-4 and trunk coupler 135.
Described first order optical splitter 131 can be the optical branching device of 1:4 for splitting ratio, it comprises a public port and four branch port, the public port of described first order optical splitter 131 is connected to trunk optical fiber 136 by described trunk coupler 135, and the other end of described trunk optical fiber is connected to the optical coupler 113 of described optical line terminal 110 inside.Four branch port of described first order optical splitter 131 are connected with branch optical fiber 137 respectively, and the other end of each branch optical fiber is connected to the public port of one of them second level optical splitter 132-1～132-4 respectively by a branch coupler 134-1～134-4.
In the present embodiment, it is the optical branching device of 1:8,1:16,1:32 or 1:64 that described second level optical splitter 132-1～132-4 can adopt branching ratio, and namely it has a public port and a plurality of branch port.The branch port of each second level optical splitter 132-1～132-4 is connected to wherein one group of optical network unit by profile fiber 138 respectively, and wherein each profile fiber connects the described second level one of them branch port of optical splitter 132-1～132-4 and its corresponding optical network unit 120-1～120-n.
On the other hand, described upgoing wave division multiplexer 133 also comprises public port and four branch port, wherein, the public port of described upgoing wave division multiplexer 133 is connected to described trunk coupler 135, and each branch port of described upgoing wave division multiplexer 133 is connected to its corresponding branch coupler 134-1～134-4 by optical fiber respectively, and is coupled to its corresponding branch optical fiber 137 by described branch coupler 134-1～134-4.In specific embodiment, channel center's wavelength of described four branch port can be respectively the described first up wavelength X u1, the described second up wavelength X u2, the described the 3rd up wavelength X u3 and the described the 4th up wavelength X u4.
Described Optical Distribution Network 130 can also comprise a plurality of band pass filters 139 that have different passbands and be connected to the branch port of described first order optical splitter 131, particularly, in the present embodiment, described Optical Distribution Network 130 can comprise four band pass filters 139, for ease of describing, described four band pass filters 139 are called after first band pass filter, second band pass filter, the 3rd band pass filter and four-tape bandpass filter respectively.Wherein, described first band pass filter is serially connected in first branch port of described first order optical splitter 131 and the branch optical fiber between the described second level optical splitter 132-1; Described second band pass filter is serially connected in second branch port of described first order optical splitter 131 and the branch optical fiber between the described second level optical splitter 132-2; Described the 3rd band pass filter is serially connected in the 3rd branch port of described first order optical splitter 131 and the branch optical fiber between the described second level optical splitter 132-3; Described four-tape bandpass filter is serially connected in the 4th branch port of described first order optical splitter 131 and the branch optical fiber between the described second level optical splitter 132-4.
Described first band pass filter, described second band pass filter, described the 3rd band pass filter have different passbands respectively with described four-tape bandpass filter, particularly, the passband centre wavelength of described first band pass filter can be the described first downstream wavelength λ d1, the passband centre wavelength of described second band pass filter can be the described second downstream wavelength λ d2, the passband centre wavelength of described the 3rd band pass filter can be described the 3rd downstream wavelength λ d3, and the passband centre wavelength of described four-tape bandpass filter can be described the 4th downstream wavelength λ d4.Based on above-mentioned passband centre wavelength, thereby described four band pass filters just can be with the multichannel multi-wavelength downstream signal of the described first order optical splitter 131 outputs downlink data of the filtering different wave length that obtains carrying respectively, and the branch optical fiber 137 by its place and corresponding second level optical splitter 132-1～132-4 respectively, export to not optical network unit on the same group.
Particularly, at down direction, the multi-wavelength downstream signal of described optical line terminal 110 outputs is through after described trunk optical fiber 136 transmission, be coupled to described first order optical splitter 131 by described trunk coupler 135,131 pairs of described multi-wavelength downstream signals of described first order optical splitter carry out the power light splitting and form after the multichannel multi-wavelength downstream signal, export to described a plurality of branch optical fiber 137 by its branch port respectively.Because described a plurality of branch optical fibers 137 are serially connected with the band pass filter 139 with different passbands respectively, therefore, when each road multi-wavelength downstream signal transmits at corresponding branch optical fiber 137, have only the light signal of one of them wavelength can pass through described band pass filter 139, the light signal of other wavelength is then by filtering.
Such as, the multi-wavelength downstream signal of first branch port output of described first order optical splitter 131 carries out after the filtering through described band pass filter 139, the light signal that only has the described first downstream wavelength λ d1 can pass through, and namely has only the downlink data of described optical transmitting set Tx1 emission to pass through; The multi-wavelength downstream signal of second branch port output of described first order optical splitter 131 carries out after the filtering through described band pass filter 139, the light signal that only has the described second downstream wavelength λ d2 can pass through, and namely has only the downlink data of described optical transmitting set Tx2 emission to pass through; The multi-wavelength downstream signal of the 3rd branch port output of described first order optical splitter 131 carries out after the filtering through described band pass filter 139, the light signal that only has described the 3rd downstream wavelength λ d3 can pass through, and namely has only the downlink data of described optical transmitting set Tx3 emission to pass through; The multi-wavelength downstream signal of the 4th branch port output of described first order optical splitter 131 carries out after the filtering through described band pass filter 139, the light signal that only has described the 4th downstream wavelength λ d4 can pass through, and namely has only the downlink data of described optical transmitting set Tx4 emission to pass through.
Therefore, the light signal that is transferred to described second level optical splitter 132-1～132-4 by each branch optical fiber 137 is respectively the downlink data of the emission of described optical transmitting set Tx1～Tx4, described downlink data carries out after the power light splitting through described second level optical splitter 132-1～132-4, further is transferred to the optical network unit of corresponding group by described profile fiber 138.
And aspect up, the time slot transmission upstream data that the light network unit of each group adopts its up wavelength X u1～λ u4 respectively and authorizes at described optical line terminal 110, because each group optical network unit adopts different up wavelength respectively, therefore same time slot can have the optical network unit of the different up wavelength of a plurality of employings to send upstream data simultaneously.After the upstream data of the different wave length that described not on the same group optical network unit sends converges by its corresponding second level optical splitter 132-1～132-4 respectively, be coupled to the different branch port of described upgoing wave division multiplexer 133 by different branch coupler 134-1～134-4.Described up wavelength multiplexer 133 is further carried out wavelength division multiplexing to the upstream data of described different wave length and is formed after the multi-wavelength upward signal, be coupled to described trunk optical fiber 136 by described trunk coupler 135, and be transferred to described optical line terminal 110 by described trunk optical fiber 136.
Based on above-mentioned multi-wavelength passive optical network system 100, the present invention also further provides a kind of downlink transmission method of multi-wavelength passive optical network system, see also Fig. 2, it is the flow chart of a kind of embodiment of downlink transmission method of multi-wavelength passive optical network system provided by the invention, and the downlink transmission method of described multi-wavelength passive optical network system comprises:
Step S1 receives the multi-wavelength downstream signal from optical line terminal, and described multi-wavelength downstream signal is carried out first order light-splitting processing formation multichannel multi-wavelength downstream signal;
Step S2 utilizes the band pass filter with different passbands respectively described multichannel multi-wavelength downstream signal to be carried out filtering and handles, and forms the single wavelength downstream signal of multichannel;
Step S3 carries out second level light-splitting processing respectively to the single wavelength downstream signal in each road, and exports to optical network unit respectively.
In specific embodiment, described multi-wavelength downstream signal can carry the first downstream wavelength signal, the second downstream wavelength signal, the 3rd downstream wavelength signal and the 4th downstream wavelength signal, and described first order light-splitting processing can be divided into four road multi-wavelength downstream signals with described multi-wavelength downstream signal.
In specific embodiment, described optical line terminal can comprise first optical transmitting set, second optical transmitting set, the 3rd optical transmitting set and the 4th optical transmitting set, and the described first downstream wavelength signal can be by described optical transmitting set emission, the described second downstream wavelength signal can be by described second optical transmitting set emission, described the 3rd downstream wavelength signal can be by described the 3rd optical transmitting set emission, and described the 4th downstream wavelength signal can be by described the 4th optical transmitting set emission.
In specific embodiment, the branch optical fiber that the different branch port that described band pass filter with different passbands can be serially connected in described first order optical splitter respectively connect.
In specific embodiment, described first order optical splitter can comprise first branch port, second branch port, the 3rd branch port and the 4th branch port, and the branch optical fiber that described first branch port, described second branch port, described the 3rd branch port and described the 4th branch port are connected can be connected in series described first band pass filter, second band pass filter, the 3rd band pass filter and four-tape bandpass filter with different passbands respectively.
In specific embodiment, the passband centre wavelength of described first band pass filter, described second band pass filter, described the 3rd band pass filter and described four-tape bandpass filter can be respectively described first downstream wavelength, described second downstream wavelength, described the 3rd downstream wavelength and described the 4th downstream wavelength.
In the downlink transmission method of multi-wavelength passive optical network system provided by the invention, the downstream signal of optical line terminal output is the multi-wavelength downstream signal, and described multi-wavelength downstream signal adopts band pass filter to carry out the downstream wavelength separation after first order light splitting respectively, thereby realize adopting respectively many data of wavelength being carried not optical network unit on the same group respectively, thus, section just can utilize different wave length to transmit the data of a plurality of optical network units simultaneously at one time, thereby effectively the overall bandwidth of elevator system satisfies user's broadband services to the increased requirement of bandwidth.
The above only is embodiments of the invention; be not so limit claim of the present invention; every equivalent structure or equivalent flow process conversion that utilizes description of the present invention to do; or directly or indirectly be used in other relevant technical field, all in like manner be included in the scope of patent protection of the present invention.
Claims (6)
1. the downlink transmission method of a multi-wavelength passive optical network system is characterized in that, comprising:
Reception is from the multi-wavelength downstream signal of optical line terminal, and described multi-wavelength downstream signal is carried out first order light-splitting processing forms multichannel multi-wavelength downstream signal;
The band pass filter that utilization has different passbands carries out the filtering processing to described multichannel multi-wavelength downstream signal respectively, forms the single wavelength downstream signal of multichannel;
The single wavelength downstream signal in each road is carried out second level light-splitting processing respectively, and export to optical network unit respectively.
2. the downlink transmission method of multi-wavelength passive optical network system according to claim 1, it is characterized in that, described multi-wavelength downstream signal carries the first downstream wavelength signal, the second downstream wavelength signal, the 3rd downstream wavelength signal and the 4th downstream wavelength signal, and described first order light-splitting processing is divided into four road multi-wavelength downstream signals with described multi-wavelength downstream signal.
3. the downlink transmission method of multi-wavelength passive optical network system according to claim 2, it is characterized in that, described optical line terminal comprises first optical transmitting set, second optical transmitting set, the 3rd optical transmitting set and the 4th optical transmitting set, and the described first downstream wavelength signal is launched by described optical transmitting set, the described second downstream wavelength signal is launched by described second optical transmitting set, described the 3rd downstream wavelength signal is launched by described the 3rd optical transmitting set, and described the 4th downstream wavelength signal is launched by described the 4th optical transmitting set.
4. the downlink transmission method of multi-wavelength passive optical network system according to claim 2 is characterized in that, the branch optical fiber that the different branch port that described band pass filter with different passbands is serially connected in described first order optical splitter respectively connect.
5. the downlink transmission method of multi-wavelength passive optical network system according to claim 4, it is characterized in that, described first order optical splitter comprises first branch port, second branch port, the 3rd branch port and the 4th branch port, and the branch optical fiber that described first branch port, described second branch port, described the 3rd branch port and described the 4th branch port are connected is connected in series described first band pass filter, second band pass filter, the 3rd band pass filter and four-tape bandpass filter with different passbands respectively.
6. the downlink transmission method of multi-wavelength passive optical network system according to claim 5, it is characterized in that the passband centre wavelength of described first band pass filter, described second band pass filter, described the 3rd band pass filter and described four-tape bandpass filter is respectively described first downstream wavelength, described second downstream wavelength, described the 3rd downstream wavelength and described the 4th downstream wavelength.
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| WO2017032162A1 (en) * | 2015-08-24 | 2017-03-02 | 中兴通讯股份有限公司 | Data transmission method, device, and system, onu and olt |
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| CN1859810A (en) * | 2005-12-31 | 2006-11-08 | 华为技术有限公司 | Passive optical network of multiple optical cut-in net shared optical fiber distribution net and realizing method |
| CN102439998A (en) * | 2011-10-25 | 2012-05-02 | 华为技术有限公司 | Passive optical network system and downlink transmission method thereof |
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| CN1859810A (en) * | 2005-12-31 | 2006-11-08 | 华为技术有限公司 | Passive optical network of multiple optical cut-in net shared optical fiber distribution net and realizing method |
| CN102439998A (en) * | 2011-10-25 | 2012-05-02 | 华为技术有限公司 | Passive optical network system and downlink transmission method thereof |
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| WO2017032162A1 (en) * | 2015-08-24 | 2017-03-02 | 中兴通讯股份有限公司 | Data transmission method, device, and system, onu and olt |
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