CN103281612A - Method for downlink transmission of multi-wavelength passive optical network system - Google Patents
Method for downlink transmission of multi-wavelength passive optical network system Download PDFInfo
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Abstract
The invention provides a method for downlink transmission of a multi-wavelength passive optical network system. The method for downlink transmission of the multi-wavelength passive optical network system comprises the steps that multi-wavelength downlink signals from an optical line terminal are received by a downlink main optical fiber and first-step light distributing processing is conducted on the multi-wavelength downlink signals so that multiple paths of multi-wavelength downlink signals can be formed, wherein the downlink main optical fiber is specially used for transmission of the downlink optical signals and uplink optical signals are transmitted to the optical line terminal through an uplink main optical fiber; filtering processing is conducted on the multiple paths of multi-wavelength downlink signals through transmission films with different transmission spectrums respectively so that multiple paths of single-wavelength downlink signals can be formed; second-step light distributing processing is conducted on each path of single-wavelength downlink signal and the paths of single-wavelength downlink signals are respectively output to an optical network unit.
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 (TimeDivision 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 transmission film that utilization has different transmission spectrums 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 wavelength downstream signal, the second wavelength downstream signal, three-wavelength downstream signal and the 4th wavelength downstream 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 wavelength downstream signal is launched by described optical transmitting set, the described second wavelength downstream signal is launched by described second optical transmitting set, described three-wavelength downstream signal is launched by described the 3rd optical transmitting set, and described the 4th wavelength downstream 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, described transmission film with different transmission spectrums is separately positioned on the branch port of first order optical splitter.
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 described first branch port, described second branch port, described the 3rd branch port and described the 4th branch port are respectively arranged with first transmission film, second transmission film, the 3rd transmission film and the 4th transmission film with different transmission spectrums.
In downlink transmission method one preferred embodiment of multi-wavelength passive optical network system provided by the invention, the central homology wavelength of described first transmission film, described second transmission film, described the 3rd transmission film and described the 4th transmission film is respectively described first wavelength, described second wavelength, described three-wavelength and described the 4th 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 is adopted after first order light splitting and is utilized transmission film to carry out the downstream wavelength separation 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 descending output port (not indicating) 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 up input port (indicate) 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 up input port and described descending output port can be connected respectively to up trunk optical fiber 135 and descending trunk optical fiber 136, described descending output port will be coupled to the descending trunk optical fiber 136 of described Optical Distribution Network 130 from the multi-wavelength downstream signal of described multiplexer 111, and described up input port will be coupled to described demodulation multiplexer 112 from the multi-wavelength upward signal of the up trunk optical fiber 135 of described Optical Distribution Network.
Described Optical Distribution Network 130 can adopt two trunk optical fibers, and has 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 and branch coupler 134-1～134-4.
Described first order optical splitter 131 can be the optical branching device of 2:8 for splitting ratio, and it comprises two public ports and eight branch port.One of them public port of described first order optical splitter 131 is as up public port, it is connected to described optical line terminal 110 by described up trunk optical fiber 135, and another public port is connected to described optical line terminal 110 as descending trunk optical fiber 136.And, wherein four branch port of described first order optical splitter 131 are as descending branch port, and be connected to described branch coupler 134-1～134-4 by descending branch optical fiber 137 respectively, and further be connected to the public port of described second level optical splitter 132-1～132-4 by described branch coupler 134-1～134-4 respectively.Four branch port of all the other of described first order optical splitter 131 are as uplink port, and are connected to described branch coupler 134-1～134-4 by up branch optical fiber 137 respectively.Described first order optical splitter 131 can carry out the light signal that receives from described descending branch optical fiber 136 to export to described descending branch optical fiber from described descending branch port respectively after the light-splitting processing, and the light signal of described up branch optical fiber is coupled to described up trunk optical fiber 135 and exports to described optical line terminal 110.
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.
In the present embodiment, four descending branch port of described first order optical splitter 131 can be coated with first transmission film respectively, second transmission film, the 3rd transmission film and the 4th transmission film, wherein said first transmission film, described second transmission film, described the 3rd transmission film has different transmission spectrums respectively with described the 4th transmission film, particularly, the central homology wavelength of described first transmission film can be the described first downstream wavelength λ d1, the central homology wavelength of described second transmission film can be the described second downstream wavelength λ d2, the central homology wavelength of described the 3rd transmission film can be described the 3rd downstream wavelength λ d3, and the central homology wavelength of described the 4th transmission film can be described the 4th downstream wavelength λ d4.Based on above-mentioned transmission film, described first order optical splitter 131 can realize that just the downlink data of the different wave length that carries in will the multi-wavelength downstream signal from described optical line terminal 110 outputs to different branch optical fiber 137 respectively, and further exports to not on the same group optical network unit by described second level optical splitter 132-1～132-4.
Particularly, at down direction, the multi-wavelength downstream signal of described optical line terminal 110 outputs is through after described descending 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 a plurality of multi-wavelength downstream signals, export to described a plurality of descending branch optical fiber by its descending branch port respectively.Because the descending branch port of described first order optical splitter 131 is coated with the transmission film of different transmission spectrums respectively, therefore, when described multi-wavelength downstream signal passes the descending branch port of described first order optical splitter 131, have only the light signal of one of them wavelength to pass through, the light signal of other wavelength is then by filtering.
Such as, the light signal of the descending branch port output of first of described first order optical splitter 131 is the downlink data with described first downstream wavelength λ d1, i.e. the downlink data of described optical transmitting set Tx1 emission; The light signal of second descending branch port output of described first order optical splitter 131 is the downlink data with described second downstream wavelength λ d2, i.e. the downlink data of described optical transmitting set Tx2 emission; The light signal of the 3rd descending branch port output of described first order optical splitter 131 is the downlink data with described the 3rd downstream wavelength λ d3, i.e. the downlink data of described optical transmitting set Tx3 emission; And the light signal of the 4th descending branch port output of described first order optical splitter 131 is the downlink data with described the 4th downstream wavelength λ d4, i.e. the downlink data of described optical transmitting set Tx4 emission.
Therefore, the light signal that is transferred to described second level optical splitter 132-1～132-4 by each descending 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 up branch port of described first order optical splitter 131 by different branch coupler 134-1～134-4.Described first order optical splitter 131 further carries out being transferred to described optical line terminal 110 by described up trunk optical fiber 135 after the multiplexing formation multi-wavelength upward signal to the upstream data of described different wave length.
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, by the multi-wavelength downstream signal of descending trunk optical fiber reception from optical line terminal, and described multi-wavelength downstream signal is carried out first order light-splitting processing form multichannel multi-wavelength downstream signal, wherein said descending trunk optical fiber is exclusively used in the transmission downlink optical signal, and uply is transferred to described optical line terminal by up trunk optical fiber;
Step S2 carries out filtering to described multichannel multi-wavelength downstream signal respectively with the transmission film with different transmission spectrums 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 carries the first wavelength downstream signal, the second wavelength downstream signal, three-wavelength downstream signal and the 4th wavelength downstream signal, and described first order light-splitting processing is divided into four road multi-wavelength downstream signals with described multi-wavelength downstream signal.
In specific embodiment, 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 wavelength downstream signal is launched by described optical transmitting set, the described second wavelength downstream signal is launched by described second optical transmitting set, described three-wavelength downstream signal is launched by described the 3rd optical transmitting set, and described the 4th wavelength downstream signal can be by described the 4th optical transmitting set emission.
In specific embodiment, described transmission film with different transmission spectrums is separately positioned on the descending branch port of first order optical splitter.
In specific embodiment, described first order optical splitter comprises the first descending branch port, the second descending branch port, the 3rd descending branch port and the 4th descending branch port, and the described first descending branch port, the described second descending branch port, the described the 3rd descending branch port and the described the 4th descending branch port are respectively arranged with first transmission film, second transmission film, the 3rd transmission film and the 4th transmission film with different transmission spectrums.
In specific embodiment, the central homology wavelength of described first transmission film, described second transmission film, described the 3rd transmission film and described the 4th transmission film is respectively described first wavelength, described second wavelength, described three-wavelength and described the 4th wavelength.
In specific embodiment, described first order optical splitter also sends the multi-wavelength upward signal by described up trunk optical fiber to described optical line terminal, and described first order optical splitter also comprises the first up branch port, the second up branch port, the 3rd up branch port and the 4th up branch port, and the channel wavelength of the described first up branch port, the second up branch port, the 3rd up branch port and the 4th up branch end is respectively the first up wavelength, the second up wavelength, the 3rd up wavelength and the 4th up 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 is adopted after first order light splitting and is utilized transmission film to carry out the downstream wavelength separation 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 correlative technology field, all in like manner be included in the scope of patent protection of the present invention.
Claims (7)
1. the downlink transmission method of a multi-wavelength passive optical network system is characterized in that, comprising:
By the multi-wavelength downstream signal of descending trunk optical fiber reception from optical line terminal, and described multi-wavelength downstream signal is carried out first order light-splitting processing form multichannel multi-wavelength downstream signal, wherein said descending trunk optical fiber is exclusively used in the transmission downlink optical signal, and uply is transferred to described optical line terminal by up trunk optical fiber;
The transmission film that utilization has different transmission spectrums 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 wavelength downstream signal, the second wavelength downstream signal, three-wavelength downstream signal and the 4th wavelength downstream 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 wavelength downstream signal is launched by described optical transmitting set, the described second wavelength downstream signal is launched by described second optical transmitting set, described three-wavelength downstream signal is launched by described the 3rd optical transmitting set, and described the 4th wavelength downstream signal can be by described the 4th optical transmitting set emission.
4. the downlink transmission method of multi-wavelength passive optical network system according to claim 2 is characterized in that, described transmission film with different transmission spectrums is separately positioned on the descending branch port of first order optical splitter.
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 the first descending branch port, the second descending branch port, the 3rd descending branch port and the 4th descending branch port, and the described first descending branch port, the described second descending branch port, the described the 3rd descending branch port and the described the 4th descending branch port are respectively arranged with first transmission film, second transmission film, the 3rd transmission film and the 4th transmission film with different transmission spectrums.
6. the downlink transmission method of multi-wavelength passive optical network system according to claim 5, it is characterized in that the central homology wavelength of described first transmission film, described second transmission film, described the 3rd transmission film and described the 4th transmission film is respectively described first wavelength, described second wavelength, described three-wavelength and described the 4th wavelength.
7. the downlink transmission method of multi-wavelength passive optical network system according to claim 1, it is characterized in that, described first order optical splitter also sends the multi-wavelength upward signal by described up trunk optical fiber to described optical line terminal, and described first order optical splitter also comprises the first up branch port, the second up branch port, the 3rd up branch port and the 4th up branch port, and the described first up branch port, the second up branch port, the channel wavelength of the 3rd up branch port and the 4th up branch end is respectively the first up wavelength, the second up wavelength, the 3rd up wavelength and the 4th up wavelength.
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| CN101902666A (en) * | 2010-04-23 | 2010-12-01 | 中兴通讯股份有限公司 | Optical code-division multiple-access (OCDMA) passive optical network system, optical distribution network device and optical line terminal |
| CN101984673A (en) * | 2010-11-12 | 2011-03-09 | 中兴通讯股份有限公司 | Passive optical network and signal transmission method thereof |
| CN101986718A (en) * | 2010-11-16 | 2011-03-16 | 中兴通讯股份有限公司 | Passive optical network (PON) system as well as optical line terminal (OLT) and wavelength route unit in passive optical network (PON) |
| 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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