CN102439998B - Passive optical network system and downlink transmission method thereof - Google Patents

Passive optical network system and downlink transmission method thereof Download PDF

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Publication number
CN102439998B
CN102439998B CN 201180002222 CN201180002222A CN102439998B CN 102439998 B CN102439998 B CN 102439998B CN 201180002222 CN201180002222 CN 201180002222 CN 201180002222 A CN201180002222 A CN 201180002222A CN 102439998 B CN102439998 B CN 102439998B
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China
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described
port
optical
wavelength
descending
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CN 201180002222
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CN102439998A (en
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卫国
程宁
王峰
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华为技术有限公司
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04JMULTIPLEX COMMUNICATION
    • H04J14/00Optical multiplex systems
    • H04J14/02Wavelength-division multiplex systems
    • H04J14/0278WDM optical network architectures
    • H04J14/0282WDM tree architectures
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04JMULTIPLEX COMMUNICATION
    • H04J14/00Optical multiplex systems
    • H04J14/02Wavelength-division multiplex systems
    • H04J14/0227Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
    • H04J14/0241Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths
    • H04J14/0242Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON
    • H04J14/0245Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON for downstream transmission, e.g. optical line terminal [OLT] to ONU
    • H04J14/0246Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON for downstream transmission, e.g. optical line terminal [OLT] to ONU using one wavelength per ONU
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04JMULTIPLEX COMMUNICATION
    • H04J14/00Optical multiplex systems
    • H04J14/02Wavelength-division multiplex systems
    • H04J14/0227Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
    • H04J14/0241Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths
    • H04J14/0242Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON
    • H04J14/0245Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON for downstream transmission, e.g. optical line terminal [OLT] to ONU
    • H04J14/0247Sharing one wavelength for at least a group of ONUs
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04JMULTIPLEX COMMUNICATION
    • H04J14/00Optical multiplex systems
    • H04J14/02Wavelength-division multiplex systems
    • H04J14/0227Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
    • H04J14/0241Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths
    • H04J14/0242Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON
    • H04J14/0249Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON for upstream transmission, e.g. ONU-to-OLT or ONU-to-ONU
    • H04J14/0252Sharing one wavelength for at least a group of ONUs, e.g. for transmissions from-ONU-to-OLT or from-ONU-to-ONU
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04JMULTIPLEX COMMUNICATION
    • H04J14/00Optical multiplex systems
    • H04J14/02Wavelength-division multiplex systems
    • H04J14/0278WDM optical network architectures
    • H04J14/0286WDM hierarchical architectures
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04QSELECTING
    • H04Q2213/00Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/1301Optical transmission, optical switches

Abstract

The embodiment of the invention discloses a passive optical network system and a downlink transmission method thereof. The passive optical network system comprises an optical line terminal, an optical distribution network and a plurality of optical network units. The optical line terminal is used to send a downlink multi-wavelength optical signal composed of a plurality of downlink optical signal wavelength division multiplexing having different wavelengths, and the optical distribution network comprises a first-stage optical splitter, a plurality of second-stage optical splitters and a plurality of filter modules. The first-stage optical splitter is used to divide a downlink multi-wavelength signal sent by the optical line terminal into a plurality of downlink multi-wavelength signals, the plurality of filter modules are used to carry out filter processing on the plurality of downlink multi-wavelength signals to obtain a downlink single wavelength optical signal of which the wavelength corresponds to a channel central wavelength; wherein, the channel central wavelengths of the plurality of filter modules respectively correspond to the plurality of downlink optical signals having different wavelengths, the second-stage optical splitters are used to carry out spectral processing on the downlink single wavelength signal and then provide the downlink single wavelength signal to the optical network unit.

Description

Passive optical network and downlink transmission method thereof

Technical field

The present invention relates to EPON (PON, Passive Optical Network) technology, relate to especially a kind of passive optical network and downlink transmission method thereof.

Background technology

Passive optical network can comprise at least one optical line terminal (OLT, Optical Line Terminal), a plurality of optical network unit (ONU, Optical Network Unit) and an Optical Distribution Network (ODN, Optical Distribution Network).Described OLT is connected to described a plurality of ONU by described ODN with point-to-multipoint form, and communicates with mode and a plurality of ONU of time division multiplexing (TDM, Time Division Multiplexing).

EPON development so far, due to its low cost, safeguard simple and can provide the very high advantages such as bandwidth to obtain a wide range of applications.But, along with the appearance of new business, the user grows with each passing day to the demand of bandwidth, and conventional P ON system adopts TDM mechanism, and service bandwidth is subject to great restriction.In order to meet the demand of user to bandwidth, need to be upgraded to PON, and the PON upgrading means and will be replaced or upgrade the equipment in PON, and this replacement or renewal need a large amount of costs, so, the PON equipment how maximum using has been disposed, reduce the cost that PON upgrades, and realizes that smooth upgrade becomes the problem that must must consider.

The PON equipment of having disposed comprises ONU and ODN, and this two-part equipment and O&M cost account for more than 2/3 of total cost usually.Therefore, how in escalation process, to maximize and use ONU and the ODN equipment disposed to seem particularly important in the smooth upgrade process of PON.Prior art replaces to mixing optical splitter (Hybrid Splitter) by the first order light-dividing device in PON and solves the existing problem of deployment facility of maximum using, and this mode of prior art can only be carried out the integral body upgrading to PON, can not upgrade flexibly according to the needs of particular user.

Summary of the invention

The embodiment of the present invention provides a kind of passive optical network, to solve the flexible upgrade problem of EPON; Simultaneously, the embodiment of the present invention also provides a kind of downlink transmission method of above-mentioned passive optical network.

A kind of passive optical network that the embodiment of the present invention provides, comprise optical line terminal, Optical Distribution Network and a plurality of optical network unit; Described optical line terminal is connected to described a plurality of optical network unit by described Optical Distribution Network; Described optical line terminal is for sending a descending multiple wavelength optical signal in road, and described descending multiple wavelength optical signal is formed by the downlink optical signal wavelength division multiplexing of a plurality of different wave lengths; Described Optical Distribution Network comprises first order optical splitter, a plurality of second level optical splitter and a plurality of filtration module; The branch port of described first order optical splitter is connected respectively described a plurality of second level optical splitter, and described a plurality of filtration modules are coupling in respectively between the branch port of the described first order optical splitter second level optical splitter corresponding with it; Described first order optical splitter is divided into the descending multi-wavelength signals of multichannel for the descending multi-wavelength signals in road that described optical line terminal is sent; Described a plurality of filtration module is for carrying out the filtering processing to the descending multiple wavelength optical signal of described multichannel, obtain the wavelength descending single wavelength light signal corresponding with its channel center's wavelength, the channel center wavelength of wherein said a plurality of filtration modules is corresponding the downlink optical signal of described a plurality of different wave lengths respectively; Described second level optical splitter offers respectively corresponding optical network unit for described descending single wavelength light signal is carried out after light-splitting processing.

The downlink transmission method of a kind of passive optical network that the embodiment of the present invention provides comprises:

Reception is from the descending multiple wavelength optical signal of optical line terminal, and described descending multiple wavelength optical signal is formed by the downlink optical signal wavelength division multiplexing of a plurality of different wave lengths;

Described descending multiple wavelength optical signal is carried out to light splitting, obtain the descending multi-wavelength signals of multichannel;

The descending multiple wavelength optical signal of described multichannel is distinguished to filtering and process, obtain descending single wavelength light signal of a plurality of different wave lengths, wherein the downlink optical signal of one of them wavelength of the respectively corresponding described descending multiple wavelength optical signal of each descending single wavelength light signal;

Described descending single wavelength light signal is carried out offering respectively corresponding optical network unit after light-splitting processing.

The passive optical network that the invention described above embodiment provides and the downlink transmission method in passive optical network can utilize the equipment in the EPON of having disposed substantially, save the upgrade cost of EPON, improve the upgrading efficiency of EPON.

The accompanying drawing explanation

In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, below will be briefly described needed accompanying drawing in embodiment or description of the Prior Art, clearly, accompanying drawing in the following describes is only explanation and the some embodiments of the present invention of prior art, for the person of ordinary skill of the art, under the prerequisite of not paying creative work, can also obtain other accompanying drawings according to these accompanying drawings.

Fig. 1 is a kind of structural representation that adopts the passive optical network of time division multiplexing mechanism;

Fig. 2 is the structural representation of the passive optical network that provides of an embodiment of the present invention;

Fig. 3 is the flow chart of the EPON downlink optical signal processing method that provides of an embodiment of the present invention;

Fig. 4 is the applicable structural representation of EPON downlink optical signal processing method that the another kind of embodiment of the present invention provides;

Fig. 5 is the flow chart of the EPON downlink optical signal processing method that provides of the another kind of embodiment of the present invention;

Fig. 6 is the applicable structural representation of EPON downlink optical signal processing method that the third embodiment of the present invention provides;

Fig. 7 is the applicable flow chart of EPON downlink optical signal processing method that the third embodiment of the present invention provides.

Embodiment

The network architecture schematic diagram of EPON (PON) system that Fig. 1 is a kind of employing time division multiplexing (TDM) mechanism.Described passive optical network can comprise optical line terminal (OLT), Optical Distribution Network (ODN) and a plurality of optical network unit (ONU).

Wherein, the direction from described OLT to described ONU is defined as down direction, and the direction from described ONU to described OLT is defined as up direction.At down direction, described OLT adopts time division multiplexing mode that downlink data is broadcast to described a plurality of ONU, and each ONU receives only the data of carrying self identification; And, at up direction, described a plurality of ONU adopt time division multiple access (TDMA, Time Division Multiplexing Access) mode and described OLT to communicate, the time slot that each ONU distributes in strict accordance with described OLT sends upstream data.

Described passive optical network can be to realize the communications network system of the Data dissemination between described OLT and described ONU without any need for active device, such as, in specific embodiment, the Data dissemination between described OLT and described ONU can be realized by the Passive Optical Components in described ODN (such as optical splitter).And, described passive optical network can be ITU-T G.984 Ethernet passive optical network (EPON) or the next-generation passive optical network (NGA PON, such as XGPON or 10GEPON etc.) of the gigabit passive optical network of standard definition (GPON) system, IEEE 802.3ah standard definition of the asynchronous transfer mode EPON of standard definition (ATM PON) system or broadband passive optical network (BPON) system, ITU-T G.983.The full content of the various passive optical networks of above-mentioned standard definition is combined in present specification by reference.

Described OLT is usually located at central office (Central Office, CO), and they can the described a plurality of ONU of unified management, and transmit data between described ONU and upper layer network.Specifically, this OLT can serve as the medium between described ONU and described upper layer network (such as internet, PSTN), the data retransmission that will receive from described upper layer network is to described ONU, and the data retransmission that will receive from described ONU is to described upper layer network.The concrete structure configuration of described OLT may be different because of the particular type of described EPON, such as, in one embodiment, described OLT can comprise optical sender Tx and receiver Rx, described transmitter is for sending downlink optical signal to described ONU, described receiver is for receiving the uplink optical signal from described ONU, and wherein said downlink optical signal and uplink optical signal can be transmitted by described ODN.

Described ONU can be arranged on user's side position (such as user resident) by distributed earth.Described ONU can be the network equipment for communicating with described OLT and user, particularly, described ONU can serve as the medium between described OLT and described user, for example, described ONU can be by the data retransmission that receives from described OLT to described user, and the data retransmission that will receive from described user is to described OLT.The structure that should be appreciated that described ONU is close with Optical Network Terminal (Optical Network Terminal, ONT), in the scheme therefore provided in present specification, between optical network unit and Optical Network Terminal, can exchange.

Described ODN can be a data dissemination system, and it can comprise optical fiber, optical coupler, optical splitter and/or other equipment.In one embodiment, described optical fiber, optical coupler, optical splitter and/or other equipment can be Passive Optical Components, specifically, described optical fiber, optical coupler, optical splitter and/or other equipment can be that distribute data signals is the device that does not need power supply to support between described OLT and described ONU.In addition, in other embodiments, this ODN can also comprise one or more treatment facilities, for example, and image intensifer or trunking (Relay device).In addition, described ODN specifically can extend to described a plurality of ONU from described optical line terminal, but also can be configured to other any point-to-multipoint structures.

Take and adopt optical splitter (Splitter) to realize that Data dissemination is as example, for the consideration of reliability and O&M aspect, described ODN can adopt the mode of two-stage light splitting to dispose, as shown in Figure 1.The ODN of take 1: 32 is example, described ODN can comprise first order optical splitter and four second level optical splitters that splitting ratio is 1: 8 that a splitting ratio is 1: 4, each branch port of described first order optical splitter is connected to described four second level optical splitters accordingly by optical fiber respectively, and each branch port of described second level optical splitter is connected to described a plurality of ONU accordingly by branch optical fiber respectively.The data-signal of described OLT first is divided into multichannel and is transferred to each ONU through second level optical splitter respectively again after first order optical splitter is divided into 4 tunnels.Described first order optical splitter is deployed in the Optical Distribution Frame nearer apart from central office (ODF, Optical Distribution Frame) and locates, so that maintaining; And described second level optical splitter is deployed in distant-end node (RN, Remote Node) and locates, this part of O&M cost is higher, after often disposing, no longer changes for many years.ONU equipment be usually located in user family or near, because environmental difference is larger, this part of O&M cost is also higher, after also often disposing, no longer changes for many years.

In the PON system, the increase of bandwidth tends to bring the change of multiplex mode, the TDM mode has obtained larger success in PON, yet the restriction due to device, the TDM mode of higher rate, particularly the bottleneck of the high speed TDM mode under burst mode manifests day by day, and TDM PON is difficult to the competent later development of PON.In this, a kind of novel multiplex mode---wave division multiplex mode (WDM, Wavelength Division Multiplexing) arises at the historic moment.

The embodiment of the present invention provides a kind of novel passive optical network PON system, and its application of combination by TDM and WDM, can rise to the bandwidth that the user provides greatly.Particularly, the PON system that the embodiment of the present invention provides can be on existing TDM PON system-based, local side OLT sends has the descending multiple wavelength optical signal that the downlink optical signal by a plurality of different wave lengths forms by wavelength division multiplexing, and ONU is divided into groups (such as, the ONU that is connected to same second level optical splitter can be divided into one group), each group ONU can distinguish between a downstream wavelength in corresponding described descending multi-wavelength signals and same group of ONU and adopts shared this downstream wavelength passage of TDM mode, and corresponding different downstream wavelength to adopt the WDM mode to carry out multiplexing respectively between ONU on the same group not.In addition, described PON system can also increase in the described descending multi-wavelength signals of filtering module for filtering off the downlink optical signal that belongs to other groups ONU by the optical fiber between first order optical splitter and second level optical splitter, so that each group ONU only receives downlink optical signal corresponding to its downstream wavelength.

The network architecture schematic diagram of a kind of passive optical network that Fig. 2 provides for the embodiment of the present invention.Described passive optical network comprises optical line terminal OLT, Optical Distribution Network ODN and a plurality of optical network unit ONU, and wherein said OLT is connected to described a plurality of ONU by described ODN.

Described optical line terminal OLT comprises a plurality of optical sender Tx1-Tx4, multiplexer 201, duplexer 206 and optical receiver Rx.Wherein, described duplexer has three ports.Described a plurality of optical sender Tx1-Tx4 is connected with an end of multiplexer 201, the other end of multiplexer 201 is connected with one of them of duplexer 206, another port of 206 of optical receiver Rx and duplexer is connected, and the 3rd port of duplexer 206 is connected with described ODN.Described optical sender Tx1-Tx4 has different emission wavelengths, it is respectively used to launch the downlink optical signal of different downstream wavelength, thereby described multiplexer 201 carries out the wavelength division multiplexing processing for a plurality of downlink optical signals by described optical sender Tx1-Tx4 emission generates a descending multiple wavelength optical signal in road, and by described duplexer 206, described descending multiple wavelength optical signal is exported to described ODN.

When TDM PON system upgrade is become to TDM-WDM PON system, at first will increase the number of optical sender, in the present embodiment, the number of optical sender is set as to 4, therefore, described 4 optical sender Tx1-Tx4 are for launching the downlink optical signal of the different downstream wavelength in 4 tunnels.In addition, with the TDM PON system shown in Fig. 1, compare, in the PON system provided at the present embodiment, described OLT can remain unchanged for the processing of uplink optical signal, particularly, described OLT inside only disposes an optical receiver Rx, for receiving the uplink optical signal that is sent and be transferred to by described ODN described OLT by described a plurality of ONU.

Described Optical Distribution Network ODN can comprise first order optical splitter 202, a plurality of filtration module 207 and a plurality of second level optical splitter 205.The common port of described first order optical splitter 202 is connected to described OLT by optical fiber, and its each branch port connects respectively one of them filtration module 207 accordingly, and further by optical fiber, be connected to accordingly the common port of a second level optical splitter 205, and each branch port of described second level optical splitter 205 is connected to different ONU by optical fiber respectively.

Filtration module 207 can comprise light path redirection device 203 and filtering device 204, in specific embodiment, described light path redirection device 203 can be three port circulators 203, described filtering device 204 can be the reflection bandstop filter part, such as FBG (Fiber Bragg Grating, Fiber Bragg Grating FBG).Each three port circulator 203 has port one, port 2 and port 3, and wherein port one is connected respectively to branch port corresponding in described first order optical splitter 202, and port 2 is connected to described FBG 204, and port 3 is connected to one of them second level optical splitter 205; That is, the port one of three port circulators 203 and port 3 respectively the level be associated on the optical fiber between first order optical splitter 202 and second level optical splitter 205.Described three port circulators 203 can provide the descending multiple wavelength optical signal by the port one input to port 2 and export described FBG 204 to, will be by the processing after filtering by FBG 204 downlink optical signal that back reflection returns and provide to port 3 and by described second level optical splitter 205 and export corresponding ONU to of port 2 input, and will directly provide to port one and by first order optical splitter and export described OLT to by the uplink optical signal of port 3 inputs.

And, in described ODN, FBG 204 in different filtration modules 207 can have different reflection channel centre wavelength, and the emission wavelength of one of them optical sender Tx1-Tx4 in the corresponding described OLT of the reflection channel centre wavelength of each FBG 204 difference, be that different FBG 204 can be reflected back the downlink optical signal of the optical sender Tx1-Tx4 of corresponding emission wavelength described three port circulators 203, and the downlink optical signal of other optical senders of filtering Tx1-Tx4.

In the present embodiment, the ODN that the branching ratio of take is 1: 32 is example, and described first order optical splitter 202 is divided into the 4 descending multiple wavelength optical signals in tunnel for the descending multiple wavelength optical signal that OLT is sent; Three port circulators 203 are for being redirected to offer respectively described FBG204 by the descending multiple wavelength optical signal in each road; FBG 204 is for the described descending multi-wavelength signals medium wavelength downlink optical signal corresponding with its reflection channel centre wavelength is reflected back to described three-port circulator 203, and the downlink optical signal of other wavelength in the described descending multiple wavelength optical signal of filtering; Second level optical splitter 205 is divided into 8 road light signals for the downlink optical signal by reflecting after described FBG 204 filtering and reaches each optical network unit ONU be connected with the branch port of described second level optical splitter 205.

Visible, the passive optical network that the present embodiment provides can be equivalent to carry out stacking stack PON (Stack PON) system by a plurality of TDM subsystems (each TDM PON subsystem can comprise a second level optical splitter 205 and the one group of ONU connected thereof) by the WDM mode, and same TDM PON subsystem adopts same downstream wavelength passage, and different TDM PON subsystem adopts different downstream wavelength passages.Because described stack PON system adopts a plurality of downstream wavelength, the upgrading that it can realize user's downlink bandwidth, meet the user due to the diversified demand that produces bandwidth of business.

With the TDM PON system shown in Fig. 1, compare, the stack PON system architecture provided at the present embodiment is only required in the optical sender Tx1-Tx4 that described OLT configures a plurality of different emission and launches descending multiple wavelength optical signal, and at the described filtration module 207 of coupling fiber that the branch port of described first order optical splitter 202 connects, described descending multiple wavelength optical signal is carried out to the wavelength requirement that wavelength screens to meet each downstream wavelength passage.Therefore, the stack PON system that the present embodiment provides can form from the TDM PON system smooth upgrade shown in Fig. 1, do not disposed each TDM PON subsystem (the ONU equipment that comprises major part and the user's side of described ODN) and do not need to change, utilized substantially the existing PON equipment of having disposed, thereby reduced the cost of PON upgrading, improved the efficiency of PON upgrading.And, when the stack PON system architecture that adopts the present embodiment to provide realizes the PON upgrading, owing to not needing to change first order optical splitter 202, the upgrading of each TDM PON subsystem is independent mutually, therefore can only for one or part TDM PON subsystem, be upgraded according to the needs of particular user, thereby be realized upgrading flexibly.

The passive optical network provided based on above-described embodiment, the embodiment of the present invention also further provides the downlink transmission method of EPON, as shown in Figure 3, comprising:

Step 301, the downlink optical signal of the multichannel different wave length that multiplexer 201 will send from the optical sender of a plurality of different emission is multiplexed into a descending multiple wavelength optical signal in road.

In the present embodiment, for the ease of better scheme of the invention being described, the emission wavelength of supposing described a plurality of optical senders is respectively 1490nm, 1491.6nm, 1493.2nm and 1494.8nm, described a plurality of optical sender can send the downlink optical signal that 4 road wavelength are respectively 1490nm, 1491.6nm, 1493.2nm and 1494.8nm, in addition, accordingly, the first order optical splitter 202 of above-mentioned ODN and second level optical splitter 205 are respectively 1: 4 and 1: 8.Should be appreciated that in practical application and can be adjusted way, wavelength and the first order of downlink optical signal and the branching ratio of second level optical splitter according to actual needs.

Step 302,202 pairs of described descending multiple wavelength optical signals of first order optical splitter carry out light splitting, form the descending multiple wavelength optical signal of multichannel and offer respectively the three port circulators 203 that are connected with described first order optical splitter 202 each branch port.

Wherein, after first order optical splitter 202 light splitting that the descending multiple wavelength optical signal obtained after multiplexing is 1: 4 through splitting ratio, become the 4 descending multiple wavelength optical signals in tunnel, wherein, the luminous power of the described 4 descending multiple wavelength optical signals in tunnel can be identical.

Step 303, the descending multiple wavelength optical signal that three port circulators 203 receive it is redirected and exports to FBG 204.

Wherein, described three port circulators 203 have 3 ports, are respectively port one, port 2 and port 3.Described descending multiple wavelength optical signal enters three port circulators 203 from port one, through being redirected, by port 2, outputs to FBG 204.

Step 304,204 pairs of described descending multiple wavelength optical signals of FBG carry out filtering, and the described descending multiple wavelength optical signal medium wavelength downlink optical signal corresponding with the reflection channel centre wavelength of described FBG 204 is reflected back to three-port circulator 203.

Particularly, the descending multiple wavelength optical signal that FBG 204 receives it (comprising 1490nm, 1491.6nm, 1493.2nm and tetra-wavelength of 1494.8nm) carries out filtering, the downlink optical signal that only retains one of them wavelength in described descending multiple wavelength optical signal, and the downlink optical signal of described single wavelength is reflected back to the port 2 of three-port circulator 203.Wherein, the wavelength of the downlink optical signal that different FBG 204 is reflected back is different, and thus, each three-port circulator 203 receives single wavelength downlink optical signal that wavelength is respectively 1490nm, 1491.6nm, 1493.2nm or 1494.8nm.

Step 305, the downlink optical signal that three port circulators 203 receive it is redirected and exports to second level optical splitter 205.

After FBG 204 reflection filters, isolated single wavelength downlink optical signal enters three port circulators 203 by the port 2 of three port circulators 203, after being redirected, by port 3, exports second level optical splitter 205 to.

Step 306, optical splitter 205 pairs of described downlink optical signals in the second level carry out light splitting, form the multichannel downlink optical signal and offer respectively each ONU that is connected to described second level optical splitter 205.

Wherein, become 8 road downlink optical signals after second level optical splitter 205 light splitting that single wavelength downlink optical signal of being exported by three port circulators 203 is 1: 8 through splitting ratio, wherein the luminous power of the identical ,Qie Mei of the wavelength of ,Mei road downlink optical signal road downlink optical signal can be identical.After light splitting, described 8 road downlink optical signals reach respectively and 8 ONU that are connected to described second level optical splitter 205, such as ONU1 to ONU8.

The network architecture schematic diagram of the passive optical network that Fig. 4 provides for the another kind of embodiment of the present invention, described passive optical network can carry out smooth upgrade from the described TDM PON of Fig. 1 system equally and obtain.

The passive optical network that the present embodiment provides and the passive optical network structure similar shown in Fig. 2, the main distinction is, is coupling in the filtration module 407 of the optical fiber between first order optical splitter 402 and second level optical splitter 406 different from filtration module 207 structures shown in Fig. 2.

In the present embodiment, the light path redirection device in described filtration module 407 can comprise first duplexer 403 and the second duplexer 405, and the two all has three ports, below is designated as respectively port one 1,12,13 and port 21,22,23.Filtering device in described filtration module 407 can be dual-port narrow band filter 404, and channel center's wavelength of each dual-port narrow band filter 404 is distinguished the emission wavelength of one of them optical sender Tx1-Tx4 in corresponding described OLT.Wherein, the port one 1 of first duplexer 403 is connected to the branch port of first order optical splitter 402; The port one 3 of first duplexer 403 is connected with the port 21 of the second duplexer 405; Two ports of dual-port narrow band filter 404 are connected to respectively the port one 2 of first duplexer 403 and the port 22 of the second duplexer 405; The port 23 of the second duplexer 405 is connected to the common port of second level optical splitter 406.

First duplexer 403 is redirected to dual-port narrow band filter 404 for the wherein descending multiple wavelength optical signal in road by 402 outputs of first order optical splitter; Dual-port narrow band filter 404 is for carrying out filtering to described descending multiple wavelength optical signal, only retain the described descending multiple wavelength optical signal medium wavelength downlink optical signal corresponding with channel center's wavelength of dual-port narrow band filter 404 after filtering, and the downlink optical signal of other wavelength of filtering; The second duplexer 405 is redirected to second level optical splitter 405 for the downlink optical signal by after filtering.

The passive optical network provided based on above-described embodiment, the embodiment of the present invention also further provides the downlink transmission method of another kind of EPON, as shown in Figure 5, comprising:

Step 501, the downlink optical signal of the multichannel different wave length that multiplexer 401 will send from the optical sender of a plurality of different emission is multiplexed into a descending multiple wavelength optical signal in road.

Step 502,402 pairs of descending multiple wavelength optical signals of first order optical splitter carry out light splitting, form the descending multiple wavelength optical signal of multichannel and offer respectively the first duplexer 403 be connected with described first order optical splitter 402 each branch port.

Step 503, the descending multiple wavelength optical signal that first duplexer 403 receives it is redirected and exports to dual-port narrow band filter 404.

Step 504,404 pairs of described descending multiple wavelength optical signals of dual-port narrow band filter carry out filtering, obtain the described descending multiple wavelength optical signal medium wavelength downlink optical signal corresponding with channel center's wavelength of described dual-port narrow band filter 404.

Step 505, the filtered downlink optical signal of the second 405 pairs of duplexers is redirected and exports to second level optical splitter 406.

Step 506, optical splitter 406 pairs of described downlink optical signals in the second level carry out light splitting and offer respectively each ONU that is connected to described second level optical splitter 406.

The detail of each step of the present embodiment can be consulted the EPON downlink transmission method embodiment shown in above-mentioned Fig. 3.

The network architecture schematic diagram of the passive optical network that Fig. 6 provides for the third embodiment of the present invention.Described passive optical network can carry out smooth upgrade from the described TDM PON of Fig. 1 system equally and obtain.

The passive optical network that the present embodiment provides and the passive optical network structure similar shown in Fig. 2, the main distinction is, is coupling in the filtration module 607 of the optical fiber between first order optical splitter 602 and second level optical splitter 605 different from filtration module 207 structures shown in Fig. 2.

In the present embodiment, the light path redirection device in described filtration module 607 can be four-port circulator 603, and wherein, described four port circulators 603 have four ports, are designated as respectively port one, port 2, port 3, port 4.Filtering device in described filtration module 407 can be dual-port narrow band filter 404, and channel center's wavelength of each dual-port narrow band filter 404 is distinguished the emission wavelength of one of them optical sender Tx1-Tx4 in corresponding described OLT.Wherein, the port one of four port circulators 603 is connected to the branch port of first order optical splitter 602; Two ports of dual-port narrow band filter 604 are connected with port 3 with the port 2 of four port circulators 603 respectively; The port 4 of four port circulators is connected to the common port of second level optical splitter 406.

Four port circulators 603 are redirected to dual-port filter 604 for the wherein descending multiple wavelength optical signal in road to its first order optical splitter 602 outputs; Dual-port narrow band filter 604 is for carrying out filtering to descending multiple wavelength optical signal, only retain the described descending multiple wavelength optical signal medium wavelength downlink optical signal corresponding with channel center's wavelength of dual-port narrow band filter 604 after filtering, and the downlink optical signal of other wavelength of filtering; And four-port circulator 603 also is redirected to second level optical splitter 605 for the downlink optical signal by after filtering.

The passive optical network provided based on above-described embodiment, the embodiment of the present invention also further provides the downlink transmission method of another EPON, as shown in Figure 7, comprising:

Step 701, the downlink optical signal of the multichannel different wave length that multiplexer 601 will send from the optical sender of a plurality of different emission is multiplexed into a descending multiple wavelength optical signal in road.

Step 702,602 pairs of descending multiple wavelength optical signals of first order optical splitter carry out light splitting, form the descending multiple wavelength optical signal of multichannel and offer respectively the four port circulators 603 that are connected with described first order optical splitter 602 each branch port.

Step 703, the descending multiple wavelength optical signal that four port circulators 603 receive it is redirected and exports to dual-port narrow band filter 604.

Step 704,604 pairs of described descending multiple wavelength optical signals of dual-port narrow band filter carry out filtering, obtain the described descending multiple wavelength optical signal medium wavelength downlink optical signal corresponding with channel center's wavelength of described dual-port narrow band filter 604.

Step 705, the downlink optical signal after four port circulators 603 accept filter, and described downlink optical signal is redirected and exports to second level optical splitter 605.

Step 706, optical splitter 605 pairs of downlink optical signals in the second level carry out light splitting and offer respectively each ONU that is connected to described second level optical splitter 605.

The detail of each step of the present embodiment can be consulted the EPON downlink transmission method embodiment shown in above-mentioned Fig. 3.

Through the above description of the embodiments, those skilled in the art can be well understood to the mode that the present invention can add essential hardware platform by software and realize, can certainly all by hardware, implement.Understanding based on such, what technical scheme of the present invention contributed to background technology can embody with the form of software product in whole or in part, this computer software product can be stored in storage medium, as ROM/RAM, magnetic disc, CD etc., comprise that some instructions are with so that a computer equipment (can be personal computer, server, or the network equipment etc.) carry out the described method of some part of each embodiment of the present invention or embodiment.

The above; be only the present invention's embodiment preferably, but protection scope of the present invention is not limited to this, anyly is familiar with in technical scope that those skilled in the art disclose in the present invention; the variation that can expect easily or replacement, within all should being encompassed in protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.

Claims (14)

1. a passive optical network, is characterized in that, comprises optical line terminal, Optical Distribution Network and a plurality of optical network unit; Described optical line terminal is connected to described a plurality of optical network unit by described Optical Distribution Network;
Described optical line terminal is for sending a descending multiple wavelength optical signal in road, and a described descending multiple wavelength optical signal in road is formed by the downlink optical signal wavelength division multiplexing of a plurality of different wave lengths;
Described Optical Distribution Network comprises first order optical splitter, a plurality of second level optical splitter and a plurality of filtration module; Wherein, the branch port of described first order optical splitter is connected respectively described a plurality of second level optical splitter, described second level optical splitter connects respectively a plurality of described optical network units, the described optical network unit that connects same described second level optical splitter adopts time division multiplexing mode to share the downstream wavelength passage, it is multiplexing that the described optical network unit that connects different described second level optical splitter adopts wave division multiplex mode to carry out, and described a plurality of filtration modules are coupling in respectively between the branch port of the described first order optical splitter second level optical splitter corresponding with it;
Described first order optical splitter is divided into the descending multi-wavelength signals of multichannel for the descending multi-wavelength signals in road that described optical line terminal is sent;
Described a plurality of filtration module is for carrying out the filtering processing to the descending multiple wavelength optical signal of described multichannel, belong to the downlink optical signal that other organizes described optical network unit in the described descending multi-wavelength signals of filtering, obtain the downlink optical signal corresponding to downstream wavelength of one group of described optical network unit connecting with described second level optical splitter;
Described second level optical splitter offers respectively corresponding optical network unit for described descending single wavelength light signal is carried out after light-splitting processing.
2. passive optical network as claimed in claim 1, is characterized in that, described filtration module comprises light path redirection device and filtering device;
Wherein, described light path redirection device is exported to described filtering device for the descending multiple wavelength optical signal by described first order optical splitter output, and descending single wavelength light signal that described filtering device is carried out obtaining after filtering to described descending multiple wavelength optical signal is exported to described second level optical splitter;
Described filtering device, for the described descending multiple wavelength optical signal entered wherein through described light path redirection device is carried out to filtering, obtains described descending single wavelength light signal.
3. passive optical network as claimed in claim 2, is characterized in that, described light path redirection device is three port circulators, and described filtering device is Fiber Bragg Grating FBG;
Wherein said three port circulators are redirected to the second port and export described Fiber Bragg Grating FBG to for the descending multiple wavelength optical signal that will enter from its first port, and descending single wavelength light signal that will be reflected back and be entered from its second port by described Fiber Bragg Grating FBG is redirected to the 3rd port and exports described second level optical splitter to;
Described Fiber Bragg Grating FBG is for the described descending multiple wavelength optical signal medium wavelength light signal corresponding with the reflection channel centre wavelength of described filtration module being reflected back to the second port of described three-port circulator, and the light signal of other wavelength in the described descending multiple wavelength optical signal of filtering.
4. passive optical network as claimed in claim 3, it is characterized in that, the first port of described three port circulators and the 3rd port level respectively are associated on the optical fiber between described first order optical splitter and second level optical splitter, and the second port of described three port circulators is connected with described Fiber Bragg Grating FBG.
5. passive optical network as claimed in claim 2, is characterized in that, described light path redirection device comprises first duplexer and the second duplexer, and described filtering device is the dual-port narrow band filter;
Wherein, described first duplexer is redirected to described dual-port narrow band filter for the descending multiple wavelength optical signal by described first order optical splitter output, and described the second duplexer is redirected to described second level optical splitter for the descending single wavelength light signal by obtaining after the filtering of described dual-port narrow band filter;
Described dual-port narrow band filter is for exporting to described the second duplexer by the described descending multiple wavelength optical signal medium wavelength light signal corresponding with channel center's wavelength of described filtration module, and the light signal of other wavelength in the described descending multiple wavelength optical signal of filtering.
6. passive optical network as claimed in claim 5, is characterized in that, the first port of described first duplexer is connected to the branch port of described first order optical splitter; The 3rd port of first duplexer is connected with the first port of the second duplexer; Two ports of dual-port narrow band filter are connected to respectively the second port of first duplexer and the second port of the second duplexer; The 3rd port of the second duplexer is connected to the common port of described second level optical splitter.
7. passive optical network as claimed in claim 2, is characterized in that, described light path redirection device is four port circulators, and described filtering device is the dual-port narrow band filter;
Wherein, described four port circulators are redirected to the second port and export to described dual-port narrow band filter for the descending multiple wavelength optical signal that will enter from its first port, and the descending single wavelength light signal obtained after the filtering of described dual-port narrow band filter and enter from the 3rd port is redirected to the 4th port and exports to described second level optical splitter;
Described dual-port narrow band filter is for the described descending multiple wavelength optical signal medium wavelength light signal corresponding with the reflection channel centre wavelength of described filtration module being exported to the 3rd port of described four port circulators, and the light signal of other wavelength in the described descending multiple wavelength optical signal of filtering.
8. passive optical network as claimed in claim 7, it is characterized in that, the first port of described four port circulators is connected to the branch port of described first order optical splitter, two ports of described dual-port narrow band filter are connected with the 3rd port with the second port of described four port circulators respectively, and the 4th port of described four port circulators is connected to the common port of described second level optical splitter.
9. the downlink transmission method of a passive optical network, be applied in described passive system, it is characterized in that, described optical line terminal is connected to described a plurality of optical network unit by described Optical Distribution Network, described Optical Distribution Network comprises first order optical splitter, a plurality of second level optical splitter and a plurality of filtration module, the branch port of described first order optical splitter is connected respectively described a plurality of second level optical splitter, described second level optical splitter connects respectively a plurality of described optical network units, the described optical network unit that connects same described second level optical splitter adopts time division multiplexing mode to share the downstream wavelength passage, the described optical network unit that connects different described second level optical splitter adopts wave division multiplex mode to carry out multiplexing, described a plurality of filtration module is coupling in respectively between the branch port of the described first order optical splitter second level optical splitter corresponding with it and comprises:
Reception is from the descending multiple wavelength optical signal of optical line terminal, and described descending multiple wavelength optical signal is formed by the downlink optical signal wavelength division multiplexing of a plurality of different wave lengths;
Described descending multiple wavelength optical signal is carried out to light splitting, obtain the descending multiple wavelength optical signal of multichannel;
The descending multiple wavelength optical signal of described multichannel is distinguished to filtering to be processed, belong to the downlink optical signal that other organizes described optical network unit in the described descending multi-wavelength signals of filtering, obtain the downlink optical signal corresponding to downstream wavelength of one group of described optical network unit connecting with described second level optical splitter;
Described descending single wavelength light signal is carried out offering respectively corresponding optical network unit after light-splitting processing.
10. the downlink transmission method of passive optical network as claimed in claim 9, is characterized in that, describedly the descending multiple wavelength optical signal of multichannel is distinguished to filtering processes, and the descending single wavelength light signal that obtains a plurality of different wave lengths comprises:
Utilize a plurality of filtration modules respectively the descending multiple wavelength optical signal of described multichannel to be carried out to the filtering processing, the channel center wavelength of each filtration module downlink optical signal of one of them wavelength of corresponding described descending multiple wavelength optical signal respectively wherein, and channel center's wavelength of different filtration modules is different.
11. the downlink transmission method of passive optical network as claimed in claim 10, it is characterized in that, described filtration module comprises light path redirection device and filtering device, wherein saidly utilizes a plurality of filtration modules respectively the descending multiple wavelength optical signal of described multichannel to be carried out to filtering to process and to comprise:
A described light path redirection device wherein descending multiple wavelength optical signal in road is exported to described filtering device;
Described filtering device carries out filtering to the described descending multiple wavelength optical signal entered wherein through described light path redirection device, obtains described descending single wavelength light signal;
Described light path redirection device receives the descending single wavelength light signal obtained after described filtering device filtering and exports to optical splitter and carry out light-splitting processing.
12. the downlink transmission method of passive optical network as claimed in claim 10, is characterized in that, described filtration module comprises three port circulator and Fiber Bragg Grating FBGs; Wherein saidly utilize a plurality of filtration modules respectively the descending multiple wavelength optical signal of described multichannel to be carried out to filtering to process and to comprise:
The descending multiple wavelength optical signal that described three port circulators will enter from its first port is redirected to the second port and exports described Fiber Bragg Grating FBG to;
Described Fiber Bragg Grating FBG is reflected back the described descending multiple wavelength optical signal medium wavelength light signal corresponding with the reflection channel centre wavelength of described filtration module the second port of described three-port circulator, and the light signal of other wavelength in the described descending multiple wavelength optical signal of filtering;
Descending single wavelength light signal that described three port circulators will be reflected back and be entered from its second port by described Fiber Bragg Grating FBG is redirected to the 3rd port and exports optical splitter to and carries out light-splitting processing.
13. the downlink transmission method of passive optical network as claimed in claim 10, is characterized in that, described filtration module comprises first duplexer, the second duplexer and dual-port narrow band filter; Wherein saidly utilize a plurality of filtration modules respectively the descending multiple wavelength optical signal of described multichannel to be carried out to filtering to process and to comprise:
Described first duplexer is redirected to described dual-port narrow band filter for the descending multiple wavelength optical signal that it is received;
Described dual-port narrow band filter is exported to described the second duplexer by the described descending multiple wavelength optical signal medium wavelength light signal corresponding with channel center's wavelength of described filtration module, and the light signal of other wavelength in the described descending multiple wavelength optical signal of filtering;
Described the second duplexer is redirected to optical splitter by the descending single wavelength light signal obtained after the filtering of described dual-port narrow band filter and carries out light-splitting processing.
14. the downlink transmission method of passive optical network as claimed in claim 10, is characterized in that, described filtration module comprises four port circulators and dual-port narrow band filter; Wherein, describedly utilize a plurality of filtration modules respectively the descending multiple wavelength optical signal of described multichannel to be carried out to filtering to process and to comprise:
The descending multiple wavelength optical signal that described four port circulators will enter from its first port is redirected to the second port;
The 3rd port of described four port circulators exported to the described descending multiple wavelength optical signal medium wavelength light signal corresponding with channel center's wavelength of described filtration module by described dual-port narrow band filter, and the light signal of other wavelength in the described descending multiple wavelength optical signal of filtering;
Described four-port circulator is redirected to the descending single wavelength light signal obtained after the filtering of described dual-port narrow band filter and enter from the 3rd port the 4th port and exports to described optical splitter and carry out light-splitting processing.
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