CN101964926B - Light signal transmission method and system - Google Patents
Light signal transmission method and system Download PDFInfo
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- CN101964926B CN101964926B CN 200910108960 CN200910108960A CN101964926B CN 101964926 B CN101964926 B CN 101964926B CN 200910108960 CN200910108960 CN 200910108960 CN 200910108960 A CN200910108960 A CN 200910108960A CN 101964926 B CN101964926 B CN 101964926B
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Abstract
The invention provides a light signal transmission method and a system. The method comprises the following steps: a local side wavelength division device transmits a plurality of downlink light signals; a downlink wavelength divider multiplexes the downlink light signals and transmits the signals to a light splitter through a principal fiber; the downlink light signals transmitted by an OLT are transmitted to the light splitter via an uplink wavelength divider; the light splitter transmits the downlink light signals to a branch wavelength divider; the branch wavelength divider demultiplexes the downlink light signals and transmits the downlink light signals to a terminal wavelength division device and a PON terminal device; uplink light signals transmitted by the PON terminal device and the terminal wavelength division device are multiplexed by the branch wavelength divider and transmitted to the light splitter; the light splitter converges the uplink light signals and transmits the converged uplink light signals to the uplink wavelength divider; and the uplink wavelength divider demultiplexes the uplink light signals, which are converged by the uplink wavelength divider, and transmits the demultiplexed uplink light signals to the local side wavelength division device and the OLT. By using the method and the system, the wavelength division system data and traditional PON data can share ODN for transmission by using the CWDM device without influencing the traditional PON service.
Description
Technical field
Design of communications of the present invention field relates in particular to optical signal transmission method and system.
Background technology
PON (Passive Optical Network, EPON) network is by OLT (the Optical LineTerminal of office's side, optical line terminal), the ONT of user's side (Optical Network Terminal) or formed by OLT, ONT and ODN (Optical Distribution Network, Optical Distribution Network).OLT is descending to the transmission direction of ONT, adopts TDM (Time Division Multiplexing, time division multiplexing) mode, i.e. the transmission of downlink data is continuous, and what OLT was continuous gives each ONT with information broadcasting, and each ONT receives only the data of oneself.ONT is up to being transmitted as of OLT, adopt TDMA (Time DivisionMultiple Access, time division multiple access is multiplexing) mode, namely upstream data sends and happens suddenly, different ONT take different ascending time slots, and a plurality of ONT share up link by time-multiplexed mode.
PON is owing to adopt the mode of point-to-multipoint, reduced the quantity of trunk optical fiber, therefore, significantly reduce the laying cost of optical fiber, and improved the integrated level of OLT equipment, simultaneously, do not have active equipment among the ODN of PON, simplified the maintenance of ODN, PON is owing to there are this two outstanding advantages, accepted by increasing operator, the construction of PON is also in expansion like a raging fire.In existing Access Network, except will realizing Internet online, phone, cable TV, also to realize the functions such as radio communication, mobile communication.If every kind of business is all laid the optical fiber of oneself, it then is the significant wastage to resource, most economical method is the ODN that multiple business shares PON, the method that shares mainly contains two kinds, a kind of is time division multiplexing, a kind of is wave division multiplexing WDM (Wavelength Division Multiplexing, wavelength division multiplexing).If the employing time division multiplexing will improve the transmission rate that has PON now, change the equipment of existing PON, cost is very high.If the employing wavelength division multiplexing only need to increase wavelength division component in existing PON, the equipment of original PON does not need to change, the application of interleaver is very flexible, and different multiplex modes can according to the characteristics of oneself, be selected by operator, therefore, wavelength division multiplexing becomes the major way that ODN shares.
The mode of existing wavelength division multiplexing is that different wavelength is used in uplink and downlink, be that each passage needs two wavelength, when wavelength number available in the system is fewer, the passage number that the wavelength-division that restriction system can be supported is taken, in the serious situation, the passage number of the wavelength division multiplexing of system's support can not satisfy system requirements.
By upgrade-system equipment, use channel spacing DWDM (the Dense WDM narrower than current system, dense wave division multipurpose) equipment, can allow system support required wavelength division multiplexing access number, but this need to use expensive system equipment and complicated control mode, can cause the increase of system's investment and O﹠M cost.
Summary of the invention
The embodiment of the invention provides a kind of optical signal transmission method and system, and the method and system that provides can be by the mode transmission wave subsystem data of shared ODN and the data of conventional P ON system.
One embodiment of the invention provides a kind of optical transmission system, comprise the local side wave-division device, support the optical line terminal OLT of passive optical network PON agreement, descending interleaver, up interleaver, optical splitter, first branch's interleaver, second branch's interleaver, the first terminal wave-division device, the second terminal wave-division device, and a PON terminal equipment and the 2nd PON terminal equipment of supporting the PON agreement, described local side wave-division device respectively by described descending interleaver be connected up interleaver and connect described optical splitter, described OLT connects described up interleaver, described optical splitter connects first terminal wave-division device and a PON terminal equipment by first branch's interleaver, connect the second terminal wave-division device and the 2nd PON terminal equipment by second branch's interleaver, wherein
Described local side wave-division device is used for sending a plurality of different wave length signals to the terminal wave-division device; And the light signal of receiving terminal wave-division device transmission;
Described descending interleaver is used for receiving a plurality of different wave length signals from described local side wave-division device, will send to described optical splitter behind described a plurality of different wave length signal multiplexings;
Described up interleaver be used for to receive the light signal from described OLT, and the light signal of described OLT is sent to described optical splitter; And according to wavelength the light signal from described optical splitter is carried out demultiplexing, the light signal behind the demultiplexing is sent to described local side wave-division device and described OLT;
Described optical splitter is used for and will separates from the light signal of described descending interleaver and described up interleaver, and the light signal after separating is sent to first branch's interleaver and second branch's interleaver; And will send to described up interleaver after the light signal coupling from first branch's interleaver and second branch's interleaver;
Described first branch's interleaver is used for and will sends to first terminal wave-division device and a PON terminal equipment behind the light signal demultiplexing from described optical splitter; And will from the optical multiplexed signal of first terminal wave-division device and a PON terminal equipment with after send to described optical splitter;
Described second branch's interleaver is used for and will sends to the second terminal wave-division device and the 2nd PON terminal equipment behind the light signal demultiplexing from described optical splitter; And will from the optical multiplexed signal of the second terminal wave-division device and the 2nd PON terminal equipment with after send to described optical splitter;
Described first terminal wave-division device, the second terminal wave-division device are used for receiving the light signal from described local side wave-division device; And to described local side wave-division device transmission light signal;
Wherein, the employed wavelength of light signal of first terminal wave-division device transmission is identical with the employed wavelength of light signal that the second terminal wave-division device receives.
One embodiment of the invention provides a kind of method of light transmission, comprising:
The local side wave-division device is launched a plurality of different wave length signals, described a plurality of light signal sends optical splitter to by trunk optical fiber after descending interleaver is multiplexing, the light signal that optical line terminal OLT sends passes through described optical splitter behind up interleaver, described optical splitter will be distributed to first branch's interleaver and second branch's interleaver from the light signal of descending interleaver with from the light signal of described up interleaver, first branch's interleaver will send to first terminal wave-division device and the first passive optical network PON terminal equipment behind the light signal demultiplexing from described optical splitter, and second branch's interleaver will send to the second terminal wave-division device and the 2nd PON terminal equipment behind the light signal demultiplexing from described optical splitter;
The light signal that the one PON terminal equipment and first terminal wave-division device send sends to described optical splitter after described first branch's interleaver is multiplexing, the light signal that the 2nd PON terminal equipment and the second terminal wave-division device send sends to described optical splitter after described second branch's interleaver is multiplexing, described optical splitter will converge from the light signal of first branch's interleaver and second branch's interleaver the up interleaver of rear transmission, send to described local side wave-division device and described OLT behind the light signal demultiplexing after will being converged by described up interleaver, wherein, the employed wavelength of light signal of first terminal wave-division device transmission is identical with the employed wavelength of light signal that the second terminal wave-division device receives.
The optical signal transmission method that the embodiment of the invention provides and system, the data of wavelength-division system and the data of conventional P ON system can be transmitted at common ODN, use the professional employed optical splitter of conventional P ON, like this, it is professional not affect traditional PON, and the interleaver of use CWDM (Coarse WDM, Coarse Wavelength Division Multiplexing), cost is also lower.
Description of drawings
The schematic diagram of the light signal transmission system that Fig. 1 provides for the embodiment of the invention one;
The schematic diagram of the light signal transmission system that Fig. 2 provides for the embodiment of the invention two;
The schematic diagram of the light signal transmission system that Fig. 3 provides for the embodiment of the invention three;
The flow chart of the down direction of the optical signal transmission method that Fig. 4 provides for the embodiment of the invention four;
The flow chart of the up direction of the optical signal transmission method that Fig. 5 provides for the embodiment of the invention four.
Specific embodiment
For the purpose, technical scheme and the advantage that make the embodiment of the invention is clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, is not intended to limit the present invention.
In following examples of the present invention, being descending with the local side wave-division device to the direction setting that the terminal wave-division device sends light signal, is up with the terminal wave-division device to the direction setting that the local side wave-division device sends light signal; Equally, be descending with OLT toward the direction setting that ONU/ONT sends light signal, be up with ONU/ONT toward the direction setting that OLT sends light signal.
The embodiment of the invention provides a kind of light signal transmission system, the system that provides can send the downlink optical signal of the local side wave-division device in the wavelength-division system and the downlink optical signal of the OLT (also can be other local side apparatus) that supports the PON agreement by the mode that shares ODN, and the terminal wave-division device of wavelength-division system and the uplink optical signal of PON terminal equipment can be sent by the mode that shares ODN, wherein, wavelength-division system uses the interleaver of CWDM, the local side wave-division device can be REC (Radio EquipmentController, the radio-frequency apparatus controller), the terminal wave-division device can be RE (Radio Equipment, radio-frequency apparatus); The PON terminal equipment is ONU or ONT, in following examples, and will be with ONU as an example.
The embodiment one of light signal transmission system provided by the invention comprises as shown in Figure 1:
Local side wave-division device 100, descending interleaver 102, OLT104, up interleaver 106, optical splitter 108, branch's interleaver, terminal wave-division device and ONU, for describing the function of each parts among Fig. 1 in detail, below will be with two branch optical fibers of user side as an example, wherein be connected with first branch's interleaver 110, first terminal wave-division device 112 and ONU114 on a branch optical fiber, be connected with second branch's interleaver 116, the second terminal wave-division device 118 and ONU120 on another branch optical fiber.
Down direction:
Local side wave-division device 100 is used for sending a plurality of downlink optical signals, and the employed wavelength of each downlink optical signal is not identical with the employed wavelength of downlink optical signal that OLT104 sends.
Local side wave-division device 100 comprises a plurality of transmitters or comprises a transmitter array, and the downlink optical signal of a wavelength of each transmitter emission is communicated by letter with a terminal wave-division device.
Descending interleaver 102 is used for and will carries out wavelength division multiplexing from a plurality of downlink optical signals of local side wave-division device 100, and the downlink optical signal after multiplexing comprises a plurality of wavelength, and the downlink optical signal after multiplexing is sent to optical splitter 108.
Up interleaver 106, be used for to send to optical splitter 108 from the downlink optical signal of OLT104.
First branch's interleaver 110, be used for to separate from the downlink optical signal of optical splitter 108 according to wavelength, light signal after separating is sent to respectively first terminal wave-division device 112 and ONU114, be specially, it is multiplexing that downlink optical signal is carried out Wave Decomposition, to send to from the downlink optical signal of local side wave-division device 100 first terminal wave-division device 112 according to wavelength, will send to ONU114 from the downlink optical signal of OLT104.
Second branch's interleaver 116, be used for to separate from the downlink optical signal of optical splitter 108 according to wavelength, light signal after separating is sent to respectively the second terminal wave-division device 118 and ONU120, be specially, it is multiplexing that downlink optical signal is carried out Wave Decomposition, to send to from the downlink optical signal of local side wave-division device 100 the second terminal wave-division device 118 according to wavelength, will send to ONU120 from the downlink optical signal of OLT104.
Up direction:
First branch's interleaver 110 is used for and will carries out wavelength division multiplexing from the uplink optical signal of first terminal wave-division device 112 with from the uplink optical signal of ONU114, and the uplink optical signal after multiplexing is sent to optical splitter 108.
First branch's interleaver 116 is used for and will carries out wavelength division multiplexing from the uplink optical signal of the second terminal wave-division device 118 with from the uplink optical signal of ONU120, and the uplink optical signal after multiplexing is sent to optical splitter 108.
Up interleaver 106, being used for will be multiplexing from the uplink optical signal Wave Decomposition of optical splitter 108 according to wavelength, will send to OLT104 from the uplink optical signal of ONU, and the uplink optical signal of self terminal wave-division device sends to local side wave-division device 100 in the future.
Local side wave-division device 100 comprises a plurality of receivers or comprises an array acceptor, and the corresponding terminal wave-division device of each receiver has a plurality ofly from the uplink optical signal of up interleaver 106, and each uplink optical signal is received by a receiver.
OLT can also select not to be connected to up interleaver 106, but is connected on the descending interleaver 102.Like this, descending interleaver 102 also possesses downlink optical signal that OLT is sent and the downlink optical signal wavelength division multiplexing that sends from the local side wave-division device and the function of demultiplexing; Up interleaver 106 does not need to possess with the downlink optical signal of OLT transmission with from the downlink optical signal wavelength division multiplexing of local side wave-division device transmission and the function of demultiplexing.
The system that present embodiment provides can also comprise circulator, described circulator connects descending interleaver 102, up interleaver 106 and optical splitter 108, being used for will be from sending to optical splitter 108 after the downlink optical signal of descending optical splitter 102 and the downlink optical signal coupling from up optical splitter 106, and will send to from the uplink optical signal of optical splitter 108 up interleaver 106.
Can also connect spare OLT on the descending interleaver 102, like this, descending interleaver 102 also possesses with the downlink optical signal of spare OLT transmission with from the downlink optical signal wavelength division multiplexing of local side wave-division device transmission and the function of demultiplexing.
Wherein, the wavelength of the downlink optical signal that first terminal wave-division device 112 receives is different from the wavelength of the uplink optical signal of transmission, and the wavelength that first terminal wave-division device 112 sends uplink optical signal can be the wavelength of the downlink optical signal of the second terminal wave-division device 118 receptions, and the wavelength of the downlink optical signal that first terminal wave-division device 112 receives can be the wavelength of the uplink optical signal of the second terminal wave-division device 118 transmissions.
The real light signal transmission system that provides of the present invention execute example two as shown in Figure 2, comprising:
Local side wave-division device 100, descending interleaver 102, circulator 203, OLT104, trunk interleaver 205, up interleaver 206, optical splitter 208, branch's interleaver, terminal wave-division device and ONU, for describing the function of each parts among Fig. 2 in detail, below will be with two branch optical fibers of user side as an example, wherein be connected with first branch's interleaver 110, first terminal wave-division device 112 and ONU114 on a branch optical fiber, be connected with second branch's interleaver 116, the second terminal wave-division device 118 and ONU120 on another branch optical fiber.
Wherein, the function of local side wave-division device 100, descending interleaver 102, first branch's interleaver 110 and second branch's interleaver 116 is described above, no longer set forth at this, the below will describe the function of circulator 203, trunk interleaver 205, optical splitter 208 and up interleaver 206.
Circulator 203 is used for sending to from the downlink optical signal of descending interleaver 102 trunk interleaver 205, and will sends to from the uplink optical signal of trunk interleaver 205 up interleaver 206.
Up interleaver 206 sends to local side wave-division device 100 after being used for separating from the uplink optical signal of circulator 203.
Optical splitter 208 is used for being distributed to from the downlink optical signal of trunk interleaver 205 each branch's interleaver, can be according to power the downlink optical signal of receiving to be averagely allocated to each branch's interleaver; And send to trunk interleaver 205 after will converging from the uplink optical signal of each branch's interleaver.
Trunk interleaver 205, being used for will be from sending to optical splitter 208 after the downlink optical signal of circulator 203 and the downlink optical signal coupling from OLT104, and send to circulator 203 and OLT104 after will separating from the uplink optical signal of optical splitter 208 according to wavelength, concrete, to send to OLT104 from the uplink optical signal of ONU, the uplink optical signal of self terminal wave-division device sends to circulator 203 in the future.
Can also connect spare OLT on the optical splitter 208, optical splitter 208 also possesses the downlink optical signal that spare OLT is sent and is averagely allocated to each branch's interleaver, and will send to from the uplink optical signal that ONU sends the function of OLT.
Wherein, the wavelength of the downlink optical signal that first terminal wave-division device 112 receives is different from the wavelength of the uplink optical signal of transmission, and the wavelength that first terminal wave-division device 112 sends uplink optical signal can be the wavelength of the downlink optical signal of the second terminal wave-division device 118 receptions, and the wavelength of the downlink optical signal that first terminal wave-division device 112 receives can be the wavelength of the uplink optical signal of the second terminal wave-division device 118 transmissions.
What the present invention provided light signal transmission system in fact executes example three as shown in Figure 3, comprising:
Local side wave-division device 100, descending interleaver 102, OLT104, up interleaver 206, optical splitter 308, branch's interleaver, terminal wave-division device and ONU, for describing the function of each parts among Fig. 3 in detail, below will be with two branch optical fibers of user side as an example, wherein be connected with first branch's interleaver 110, first terminal wave-division device 112 and ONU114 on a branch optical fiber, be connected with second branch's interleaver 116, the second terminal wave-division device 118 and ONU120 on another branch optical fiber.
Wherein, the function of local side wave-division device 100, descending interleaver 102, up interleaver 206, first branch's interleaver 110 and second branch's interleaver 116 is described above, no longer sets forth at this, and the below will set forth the function of optical splitter 308.
Those of ordinary skills can know that the up interleaver among the above embodiment and descending interleaver also can be interleavers that is grouped together, and each branch's interleaver also can be divided into up branch interleaver and descending branch interleaver.
Wherein, the wavelength of the downlink optical signal that first terminal wave-division device 112 receives is different from the wavelength of the uplink optical signal of transmission, and the wavelength that first terminal wave-division device 112 sends uplink optical signal can be the wavelength of the downlink optical signal of the second terminal wave-division device 118 receptions, and the wavelength of the downlink optical signal that first terminal wave-division device 112 receives can be the wavelength of the uplink optical signal of the second terminal wave-division device 118 transmissions.
The light signal transmission system that the embodiment of the invention provides, adopting CWDM equipment that wavelength-division system data and traditional PON data communication device are crossed the mode that shares ODN transmits, the wavelength that the light signal of transmission adopts is different, adopt optical splitter that light signal is distributed to each branch's interleaver at trunk optical fiber, send to terminal wave-division device and ONU after by branch's interleaver light signal being separated, in this process, it is professional not affect traditional PON.
The embodiment of the invention four provides a kind of optical signal transmission method, and the method that provides can realize that wavelength-division system data and traditional PON data communication device cross the mode that shares ODN and transmit.
Down direction: the local side wave-division device is launched a plurality of downlink optical signals, and described a plurality of downlink optical signals are received by descending interleaver, sends optical splitter to by the trunk optical fiber between descending interleaver and the optical splitter behind descending interleaver wavelength division multiplexing.Optical line terminal OLT sends downlink optical signal, and the downlink optical signal that OLT sends is received by up interleaver, and the trunk optical fiber between up interleaver and optical splitter is transferred to optical splitter.Wherein, the employed wavelength of downlink optical signal of local side wave-division device transmission is not identical with the employed wavelength of downlink optical signal that OLT sends.Described optical splitter is distributed to the downlink optical signal of receiving on the branch optical fiber, is transferred to branch's interleaver through branch optical fiber.Branch's interleaver according to wavelength (de) multiplexing, sends to optical network unit ONU with the downlink optical signal of OLT with the downlink optical signal on the branch optical fiber, and the downlink optical signal of local side wave-division device is sent to the terminal wave-division device;
Behind the uplink optical signal process branch interleaver that up direction: ONU and terminal wave-division device send, by wavelength division multiplexing to branch optical fiber, through entering described optical splitter after the branch optical fiber transmission, described light splitting will be coupled to from the uplink optical signal of branch's interleaver on the trunk optical fiber of optical splitter and up interleaver, be transferred to up interleaver through behind the trunk optical fiber.Described up interleaver according to wavelength (de) multiplexing, sends to OLT with the uplink optical signal of ONU with the uplink optical signal on the trunk optical fiber, and the uplink optical signal of terminal wave-division device is sent to the local side wave-division device.
The detailed process of down direction comprises as shown in Figure 4:
The local side wave-division device uses a plurality of transmitters or a transmitter array, issue a plurality of downlink optical signals, the employed wavelength of these light signals is different, and the wavelength of the light signal that the light signal that sends with OLT and ONU send is not identical yet, and a plurality of downlink optical signals that the local side wave-division device sends are received by descending interleaver.
OLT uses the downlink optical signal of bill wavelength under the transmitter to ONU all in the ODN, and the downlink optical signal that OLT sends is received by up interleaver.
The downlink optical signal that OLT sends also can be received by descending interleaver, and when OLT connected up interleaver, the downlink optical signal that sends was received by up interleaver; When OLT connected descending interleaver, the downlink optical signal that sends was received by descending wave-division device.
Step 402, descending interleaver carries out sending to optical splitter behind the wavelength division multiplexing to a plurality of downlink optical signals that the local side wave-division device sends, and the downlink optical signal that OLT sends sends to optical splitter through up interleaver.
Descending interleaver carries out wavelength division multiplexing to a plurality of downlink optical signals from the local side wave-division device, downlink optical signal after multiplexing comprises a plurality of wavelength, they transmit in a trunk optical fiber simultaneously, then enter optical splitter, and the mode with wavelength division multiplexing in trunk optical fiber is transmitted.
The downlink optical signal that OLT sends enters optical splitter through up interleaver or descending interleaver transparent transmission.
If the downlink optical signal that OLT sends is through descending interleaver transparent transmission, then up interleaver does not send downlink optical signal to optical splitter, and optical splitter only will be distributed to from the downlink optical signal of descending interleaver each branch's interleaver.
If the downlink optical signal that OLT sends is through up interleaver transparent transmission, then up interleaver and descending interleaver all send downlink optical signal to optical splitter, and optical splitter will be distributed to from the downlink optical signal of descending interleaver and up interleaver each branch's interleaver.
Optical splitter is according to the number of branch optical fiber, and the power averaging of downlink optical signal is assigned on all branch optical fibers, and the transmission through branch optical fiber enters branch's interleaver.Step 406, branch's interleaver will send to terminal wave-division device and ONU behind the downlink optical signal demultiplexing from optical splitter.
Branch's interleaver will will send to ONU from the downlink optical signal of OLT from the downlink optical signal demultiplexing of optical splitter according to wavelength, will send to from the downlink optical signal of local side wave-division device the terminal wave-division device.
The detailed process of up direction comprises as shown in Figure 5:
Step 500, the terminal wave-division device sends uplink optical signal, and ONU sends uplink optical signal.
The terminal wave-division device sends uplink optical signal, the uplink optical signal that sends is single wavelength, the wavelength that the downlink optical signal of the wavelength that the uplink optical signal that all terminal wave-division devices send adopts and the reception of all terminal wave-division devices adopts is identical, is the emission wavelength of second terminal wave-division device such as the reception wavelength of first terminal wave-division device; The emission wavelength of first terminal wave-division device is the reception wavelength of the 3rd terminal wave-division device, and second terminal wave-division device and the 3rd terminal wave-division device can be terminal wave-division devices, also can be two terminal wave-division devices etc.Wherein, the wavelength of the wavelength of the downlink optical signal that each terminal wave-division device receives and the uplink optical signal of transmission is not identical, and it is not identical with the employed wavelength of uplink optical signal that the other-end wave-division device sends that each the terminal wave-division device in all terminal wave-division devices sends the employed wavelength of uplink optical signal.
ONU sends uplink optical signal to OLT, and the uplink optical signal of transmission is not identical with the wavelength that all terminal wave-division devices send uplink optical signal.
Step 502 sends to optical splitter after the uplink optical signal of branch's interleaver self terminal wave-division device in future and ONU is multiplexing.
The branch interleaver in the future uplink optical signal of self terminal wave-division device and ONU carries out multiplexingly, and the uplink optical signal after multiplexing comprises a plurality of wavelength, and their transmit in a trunk optical fiber simultaneously, then enter optical splitter.
Step 504, optical splitter will send to up interleaver after will converging from the uplink optical signal of each branch's interleaver.
Optical splitter carries out converging of power with the uplink optical signal of each branch's interleaver, and the uplink optical signal after optical splitter will converge sends to up interleaver.
In this step, if OLT is connected on the descending interleaver, the uplink optical signal after then optical splitter will converge sends to up interleaver and descending interleaver.
Step 506, up interleaver will from the uplink optical signal demultiplexing of optical splitter, send to respectively local side wave-division device and OLT according to wavelength.
Up interleaver will be from the uplink optical signal demultiplexing of optical splitter according to wavelength, and the uplink optical signal of self terminal wave-division device sends to the local side wave-division device in the future, will send to OLT from the uplink optical signal of ONU.
The uplink optical signal that up interleaver sends to the local side wave-division device has a plurality of, the local side wave-division device has a plurality of receivers or an array acceptor is arranged, the corresponding terminal wave-division device of each receiver, each uplink optical signal after up interleaver separates is received by a receiver.
The optical signal transmission method that present embodiment provides, the wavelength of the light signal that wavelength-division system sends is different from the employed wavelength of light signal that OLT and ONU send, after the optical multiplexed signal usefulness of interleaver with wavelength-division system, the light signal that sends with OLT or ONU transmits in common ODN, in this process, do not need to change the employed optical splitter of conventional P ON system, traditional PON business is not affected yet, adopt simultaneously the CWDM wave-division device, cost is also lower, when the number of wavelengths of system's support is less than the desired number of wavelengths of conventional method, can support required wavelength division multiplexing access quantity.
More than disclosed only be several specific embodiment of the present invention, still, the present invention is not limited thereto, the changes that any person skilled in the art can think of all should fall into protection scope of the present invention.
Claims (10)
1. optical transmission system, it is characterized in that, comprise the local side wave-division device, support the optical line terminal OLT of passive optical network PON agreement, descending interleaver, up interleaver, optical splitter, first branch's interleaver, second branch's interleaver, the first terminal wave-division device, the second terminal wave-division device, and a PON terminal equipment and the 2nd PON terminal equipment of supporting the PON agreement, described local side wave-division device respectively by described descending interleaver be connected up interleaver and connect described optical splitter, described OLT connects described up interleaver, described optical splitter connects first terminal wave-division device and a PON terminal equipment by first branch's interleaver, connect the second terminal wave-division device and the 2nd PON terminal equipment by second branch's interleaver, wherein
Described local side wave-division device is used for sending a plurality of different wave length signals to the terminal wave-division device; And the light signal of receiving terminal wave-division device transmission;
Described descending interleaver is used for receiving a plurality of different wave length signals from described local side wave-division device, will send to described optical splitter behind described a plurality of different wave length signal multiplexings;
Described up interleaver be used for to receive the light signal from described OLT, and the light signal of described OLT is sent to described optical splitter; And according to wavelength the light signal from described optical splitter is carried out demultiplexing, the light signal behind the demultiplexing is sent to described local side wave-division device and described OLT;
Described optical splitter is used for and will separates from the light signal of described descending interleaver and described up interleaver, and the light signal after separating is sent to first branch's interleaver and second branch's interleaver; And will send to described up interleaver after the light signal coupling from first branch's interleaver and second branch's interleaver;
Described first branch's interleaver is used for and will sends to first terminal wave-division device and a PON terminal equipment behind the light signal demultiplexing from described optical splitter; And will from the optical multiplexed signal of first terminal wave-division device and a PON terminal equipment with after send to described optical splitter;
Described second branch's interleaver is used for and will sends to the second terminal wave-division device and the 2nd PON terminal equipment behind the light signal demultiplexing from described optical splitter; And will from the optical multiplexed signal of the second terminal wave-division device and the 2nd PON terminal equipment with after send to described optical splitter;
Described first terminal wave-division device, the second terminal wave-division device are used for receiving the light signal from described local side wave-division device; And to described local side wave-division device transmission light signal;
Wherein, the employed wavelength of light signal of first terminal wave-division device transmission is identical with the employed wavelength of light signal that the second terminal wave-division device receives.
2. system according to claim 1 is characterized in that, described system also comprises circulator, and described circulator connects described descending interleaver, described up interleaver and described optical splitter,
Described circulator, being used for will be from sending to described optical splitter after the light signal of described descending interleaver and the light signal coupling from described up interleaver, and will send to from the light signal of described optical splitter described up interleaver.
3. system according to claim 1 is characterized in that, described local side wave-division device comprises a plurality of transmitters or comprises a transmitter array, and described a plurality of transmitters or a transmitter array are used for launching a plurality of different wave length signals.
4. system according to claim 1, it is characterized in that, described local side wave-division device comprises a plurality of receivers or comprises an array acceptor, and described a plurality of receivers or an array acceptor are used for a plurality of different wave length signals of reception behind described up interleaver demultiplexing.
5. system according to claim 1 is characterized in that, described system also comprises spare OLT, and described spare OLT links to each other with described descending interleaver,
Described descending interleaver also is used for and will and will carry out multiplexingly from the light signal of described local side wave-division device from the light signal of described spare OLT, and the light signal after multiplexing is sent to described optical splitter.
6. each described system is characterized in that according to claim 1-5, and a described PON terminal equipment is optical network unit ONU or Optical Network Terminal ONT, and described the 2nd PON terminal equipment is ONU or ONT.
7. the method for a light transmission is characterized in that, comprising:
The local side wave-division device is launched a plurality of different wave length signals, described a plurality of light signal sends optical splitter to by trunk optical fiber after descending interleaver is multiplexing, the light signal that optical line terminal OLT sends passes through described optical splitter behind up interleaver, described optical splitter will be distributed to first branch's interleaver and second branch's interleaver from the light signal of descending interleaver with from the light signal of described up interleaver, first branch's interleaver will send to first terminal wave-division device and the first passive optical network PON terminal equipment behind the light signal demultiplexing from described optical splitter, and second branch's interleaver will send to the second terminal wave-division device and the 2nd PON terminal equipment behind the light signal demultiplexing from described optical splitter;
The light signal that the one PON terminal equipment and first terminal wave-division device send sends to described optical splitter after described first branch's interleaver is multiplexing, the light signal that the 2nd PON terminal equipment and the second terminal wave-division device send sends to described optical splitter after described second branch's interleaver is multiplexing, described optical splitter will converge from the light signal of first branch's interleaver and second branch's interleaver the up interleaver of rear transmission, send to described local side wave-division device and described OLT behind the light signal demultiplexing after will being converged by described up interleaver, wherein, the employed wavelength of light signal of first terminal wave-division device transmission is identical with the employed wavelength of light signal that the second terminal wave-division device receives.
8. method according to claim 7 is characterized in that, the employed wavelength of a plurality of light signals of described local side wave-division device emission is different from the wavelength of the light signal that described OLT sends.
9. method according to claim 7 is characterized in that, the wavelength of the light signal that described first terminal wave-division device receives is different from the wavelength of the signal of transmission.
10. method according to claim 7, it is characterized in that, it is single wavelength that described first terminal wave-division device sends light signal, and the wavelength of the light signal of described first terminal wave-division device transmission is different from the wavelength of the light signal of described the second terminal wave-division device transmission.
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| CN104244116A (en) * | 2013-06-14 | 2014-12-24 | 中兴通讯股份有限公司 | Method, device and system for sharing optical module |
| EP3242418B1 (en) * | 2014-12-30 | 2019-02-20 | Huawei Technologies Co. Ltd. | Wireless fronthaul passive optical network (pon) system, optical network device and method |
| CN115622374B (en) * | 2022-09-22 | 2024-04-26 | 中国南方电网有限责任公司超高压输电公司广州局 | Trigger system of converter valve and control system for direct current transmission system |
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| CN101075854A (en) * | 2007-06-28 | 2007-11-21 | 中兴通讯股份有限公司 | Method and apparatus for realizing hybrid passive optical network based on WDM and TDM |
| WO2009043272A1 (en) * | 2007-09-26 | 2009-04-09 | Huawei Technologies Co., Ltd. | Optical line terminal, passive optical network and radio frequency signal transmission method |
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| WO2009043272A1 (en) * | 2007-09-26 | 2009-04-09 | Huawei Technologies Co., Ltd. | Optical line terminal, passive optical network and radio frequency signal transmission method |
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