CN101877798B - Coexistence system of existing passive optical network and next generation passive optical network and updating method - Google Patents
Coexistence system of existing passive optical network and next generation passive optical network and updating method Download PDFInfo
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Abstract
The invention discloses a coexistence system of the existing passive optical network and the next generation passive optical network and a smooth updating method. The operation bandwidth of the uplink optical signal defined by the existing passive optical network and the next generation passive optical network is overlapped. The coexistence system comprises a backbone fiber, a light distribution network, a first optical line terminal and a first optical network unit of the existing passive optical network, a second optical line terminal and a second network unit of the next generation passive optical network and a wavelength division multiplexer which is connected with the backbone fiber, the first optical line terminal and the second optical line terminal; the second optical network unit is connected with the light distribution network; the light distribution network and/ or the first optical network unit narrows the operation bandwidth of the uplink optical signal of the existing passive optical network to the range which is not overlapped with the operation bandwidth of the uplink optical signal of the next generation passive optical network. The invention can avoid the bandwidth conflict of two passive optical networks and fully utilizes the bandwidth.
Description
Technical field
The present invention relates to optical access network communication field, relate in particular to symbiotic system and the smooth upgrading method of a kind of existing passive optical-fiber network and next-generation passive optical network.
Background technology
Current Technology of Light Access Network is all based on time-multiplexed passive optical network technique (Time-Division-Multiplexing Passive Optical Network, TDM-PON).Mainly contain Ethernet passive optical network (Ethernet Passive Optical Network, EPON), and gigabit passive optical network (Gigabit-Capable Passive Optical Network, GPON) two kinds, wherein, existing EPON mainly refers to gigabit ethernet passive optical network (Gigabit Ethernet Passive OpticalNetwork, GEPON).But, along with people are to the improving constantly of bandwidth requirement, and proposed that many nets merge and the requirement such as multiple service supporting, existing GEPON and GPON cannot meet these demands, therefore need to existing optical access network upgrading with upgrade.At present, support the next-generation passive optical network of higher rate as Erecting and improving substantially of the relevant criterion of 10Gbps EPON (10GEPON) and 10Gbps GPON (10GGPON), especially 10GEPON, the two corresponding commercial product is also in the development phase simultaneously.However next-generation passive optical network technology can not replace existing GEPON/GPON technology completely, but within the quite a long time from now on.Therefore,, in the urgent need to a kind of smooth evolution method and system to next-generation passive optical network, it can compatible GEPON/GPON.
The uplink optical signal of GEPON and GPON is operated in O wave band, and bandwidth range is at 1260nm to 1360nm; Downlink optical signal is operated in S-band, and bandwidth range is at 1480nm to 1500nm; And the uplink optical signal of 10GEPON and 10GGPON is operated in O-wave band, bandwidth range is at 1260nm to 1280nm; Downlink optical signal is operated in L-band, and bandwidth range is at 1574nm to 1580nm.Visible, the uplink optical signal of the uplink optical signal of GEPON and GPON and 10GEPON and 10GGPON is overlapping at 1260nm to 1280nm.In order to realize the existing passive optical-fiber network GEPON of single fiber, GPON and next-generation passive optical network 10GEPON, 10GGPON coexists, and just need to solve the bandwidth conflict problem of uplink optical signal.
Industry has proposed the scheme of the upgrading from GEPON to 10GEPON at present, because these two kinds of EPON downlink optical signal wavelength of standard regulation are different, therefore the downlink optical signal of these two kinds of EPONs can directly adopt the mode of wavelength division multiplexing to realize compatible; And the uplink optical signal wavelength of these two kinds of EPONs has lap, need to adopt time-multiplexed mode to realize compatibility.Although adopt time-multiplexed mode also can realize sharing of Optical Distribution Network, sacrifice bandwidth, and need between the EPON of two kinds of speed, carry out synchronously, having increased technical difficulty and production cost.
Also there is same problem in the smooth evolution of realizing from GEPON to 10GGPON, from GPON to 10GGPON, from GPON to 10GEPON.
Summary of the invention
The technical problem to be solved in the present invention is to provide the symbiotic system of a kind of existing passive optical-fiber network and next-generation passive optical network, can avoid the bandwidth conflict of two kinds of EPONs, and makes full use of bandwidth.
In order to address the above problem, the invention provides the symbiotic system of a kind of existing passive optical-fiber network and next-generation passive optical network, the bandwidth of operation of described existing passive optical-fiber network and the defined uplink optical signal of next-generation passive optical network is overlapping, this symbiotic system comprises trunk fiber, Optical Distribution Network, one or more first optical line terminals of existing passive optical-fiber network and one or more first optical network units of existing passive optical-fiber network, is characterized in that:
Also comprise one or more second optical line terminals of next-generation passive optical network and one or more second optical network units of next-generation passive optical network, and the wavelength division multiplexer being connected with described trunk fiber, the first optical line terminal and the second optical line terminal, described the second optical network unit is connected with described Optical Distribution Network;
Described Optical Distribution Network and/or described the first optical network unit are narrowed to the bandwidth of operation of existing passive optical network uplink light signal in the non-overlapping scope of bandwidth of operation with next-generation passive optical network uplink optical signal.
Further, above-mentioned symbiotic system also can have following characteristics:
Described existing passive optical-fiber network is gigabit ethernet passive optical network (GEPON), and described next-generation passive optical network is 10G gigabit passive optical network (10GGPON); Or
Described existing passive optical-fiber network is gigabit passive optical network (GPON), and described next-generation passive optical network is 10G Ethernet passive optical network (10GEPON); Or
Described existing passive optical-fiber network is gigabit passive optical network (GPON), and described next-generation passive optical network is 10G gigabit passive optical network (10GGPON).
Further, above-mentioned symbiotic system also can have following characteristics:
Described and the non-overlapping scope of bandwidth of operation next-generation passive optical network uplink optical signal refers to 1290nm～1360nm.
Further, above-mentioned symbiotic system also can have following characteristics:
In all the first optical network units, send uplink optical signal optical transmission module bandwidth of operation all with the non-overlapping scope of bandwidth of operation of next-generation passive optical network uplink optical signal in.
Further, above-mentioned symbiotic system also can have following characteristics:
Described Optical Distribution Network comprises the first dispensing section optical splitter being connected with trunk fiber, the second dispensing section optical splitter, and be connected to the wavelength shifter between the first dispensing section optical splitter and the second dispensing section optical splitter, all the first optical network units are all connected to the second dispensing section optical splitter, described wavelength shifter is narrowed in the non-overlapping scope of bandwidth of operation with next-generation passive optical network uplink optical signal for the bandwidth of operation of uplink optical signal that the first optical network unit is sent through the second dispensing section optical splitter, output to again the first dispensing section optical splitter, and described wavelength shifter is to downlink optical signal transparent transmission, the second optical network unit is directly connected with the first dispensing section optical splitter.
Further, above-mentioned symbiotic system also can have following characteristics:
In part the first optical network unit, send uplink optical signal optical transmission module bandwidth of operation with the non-overlapping scope of bandwidth of operation of next-generation passive optical network uplink optical signal in;
Described Optical Distribution Network comprises the first dispensing section optical splitter being connected with trunk fiber, the second dispensing section optical splitter being connected with all the other first optical network units, and be connected to the wavelength shifter between the first dispensing section optical splitter and the second dispensing section optical splitter; Described wavelength shifter is narrowed in the non-overlapping scope of bandwidth of operation with next-generation passive optical network uplink optical signal for the bandwidth of operation of uplink optical signal that all the other first optical network units are sent through the second dispensing section optical splitter, output to again the first dispensing section optical splitter, and described wavelength shifter is to downlink optical signal transparent transmission;
Described the second optical network unit is connected with the first dispensing section optical splitter.
Above-mentioned symbiotic system can be avoided the bandwidth conflict of two kinds of EPONs, and makes full use of bandwidth.In each execution mode, provide from GEPON to 10GGPON, from GPON to 10GGPON, from GPON to 10GEPON symbiotic system, simple, reliable and workable, and can utilize original GEPON/GPON resource as far as possible.
The another technical problem that the present invention will solve is to provide a kind of method from existing passive optical-fiber network to next-generation passive optical network smooth upgrade, can avoid the bandwidth conflict of two kinds of EPONs, and make full use of bandwidth.
In order to address the above problem, the invention provides a kind of method from existing passive optical-fiber network to next-generation passive optical network smooth upgrade, being used for is the symbiotic system of existing passive optical-fiber network and next-generation passive optical network by existing passive optical-fiber network smooth upgrade, the Optical Distribution Network that this existing passive optical-fiber network comprises trunk fiber, is connected with described trunk fiber, one or more the first optical line terminals and one or more the first optical network unit, and with the bandwidth of operation of the defined uplink optical signal of this next-generation passive optical network is overlapping, the method comprises:
Set up one or more wavelength division multiplexers, and one or more second optical line terminals of next-generation passive optical network and one or more second optical network units of next-generation passive optical network, described wavelength multiplexer is connected with described trunk fiber, the first optical line terminal and the second optical line terminal, described the second optical network unit is connected with described Optical Distribution Network;
By the transformation to described Optical Distribution Network and/or described the first optical network unit, the bandwidth of operation of existing passive optical network uplink light signal is narrowed in the non-overlapping scope of bandwidth of operation with next-generation passive optical network uplink optical signal.
Further, said method also can have following characteristics:
Described existing passive optical-fiber network is gigabit ethernet passive optical network (GEPON), and described next-generation passive optical network is 10G gigabit passive optical network (10GGPON); Or
Described existing passive optical-fiber network is gigabit passive optical network (GPON), and described next-generation passive optical network is 10G Ethernet passive optical network (10GEPON); Or
Described existing passive optical-fiber network is gigabit passive optical network (GPON), and described next-generation passive optical network is 10G gigabit passive optical network (10GGPON).
Further, said method also can have following characteristics:
Described and the non-overlapping scope of bandwidth of operation next-generation passive optical network uplink optical signal refers to 1290nm～1360nm.
Further, said method also can have following characteristics: the described transformation to described Optical Distribution Network and/or described the first optical network unit adopts with the one in upper type:
The first, is narrowed to the bandwidth of operation that sends the optical transmission module of uplink optical signal in all the first optical network units in the non-overlapping scope of bandwidth of operation with next-generation passive optical network uplink optical signal;
The second, in Optical Distribution Network, set up at least one wavelength shifter and at least one second dispensing section optical splitter, one end that described wavelength shifter wavelength is narrowed is connected with original the first dispensing section optical splitter in Optical Distribution Network, the other end is connected with the second dispensing section optical splitter, all the first optical network units are all connected to the second dispensing section optical splitter, the bandwidth of operation of described wavelength shifter is sent the first optical network unit uplink optical signal through the second dispensing section optical splitter is narrowed in the non-overlapping scope of bandwidth of operation with next-generation passive optical network uplink optical signal, output to again the first dispensing section optical splitter, and described wavelength shifter is to downlink optical signal transparent transmission, the second optical network unit is directly connected with the first dispensing section optical splitter,
The third, be narrowed to the bandwidth of operation that sends the optical transmission module of uplink optical signal in part the first optical network unit in the non-overlapping scope of bandwidth of operation with next-generation passive optical network uplink optical signal, simultaneously, in Optical Distribution Network, set up at least one wavelength shifter and at least one second dispensing section optical splitter, one end that described wavelength shifter wavelength is narrowed is connected with original the first dispensing section optical splitter in Optical Distribution Network, the other end is connected with the second dispensing section optical splitter, all the other first optical network units are connected to the second dispensing section optical splitter, the bandwidth of operation of described wavelength shifter is sent all the other first optical network units uplink optical signal through the second dispensing section optical splitter is narrowed in the non-overlapping scope of bandwidth of operation with next-generation passive optical network uplink optical signal, output to again the first dispensing section optical splitter, and described wavelength shifter is to downlink optical signal transparent transmission, the second optical network unit is directly connected with the first dispensing section optical splitter.
The above-mentioned method from existing passive optical-fiber network to next-generation passive optical network smooth upgrade can be avoided the bandwidth conflict of two kinds of EPONs and make full use of bandwidth.In each execution mode, provide the smooth upgrading method from GEPON to 10GGPON, from GPON to 10GGPON, from GPON to 10GEPON, can provide subsequent network compatibility to the GEPON/GPON system of having disposed, realize TDM-PON symbiotic system simple, reliable, workable and that upgrade cost is low, and in realizing smooth evolution, can utilize original GEPON/GPON resource as far as possible.
Brief description of the drawings
Fig. 1 (a) is first embodiment of the invention GEPON and 10GGPON symbiotic system schematic diagram;
Fig. 1 (b) is the frequency spectrum profile of symbiotic system shown in Fig. 1 (a);
The first change example that Fig. 1 (c) is first embodiment of the invention, the schematic diagram of GPON and 10GEPON symbiotic system;
Fig. 1 (d) is the frequency spectrum profile of symbiotic system in Fig. 1 (c);
The second change example that Fig. 1 (e) is first embodiment of the invention, the schematic diagram of GPON and 10GGPON symbiotic system;
Fig. 1 (f) is the frequency spectrum profile of symbiotic system shown in Fig. 1 (e);
Fig. 2 (a) is second embodiment of the invention GEPON and 10GGPON symbiotic system schematic diagram;
Fig. 2 (b) is the frequency spectrum profile of symbiotic system shown in Fig. 2 (a);
The first change example that Fig. 2 (c) is second embodiment of the invention, the schematic diagram of GPON and 10GEPON symbiotic system;
Fig. 2 (d) is the frequency spectrum profile of symbiotic system shown in Fig. 2 (c);
The second change example that Fig. 2 (e) is second embodiment of the invention, the schematic diagram of GPON and 10GGPON symbiotic system;
Fig. 2 (f) is the frequency spectrum profile of symbiotic system shown in Fig. 2 (e).
Embodiment
Below in conjunction with accompanying drawing, specific embodiments of the invention are elaborated.
The first embodiment
Fig. 1 (a) shows the structure of the present embodiment GEPON and 10GGPON symbiotic system, this symbiotic system comprises wavelength division multiplexer (Wave Division Multiplexer, WDM), optical line terminal (the Optical Line Terminal of this WDM and at least one GEPON, OLT) be connected with the optical line terminal of at least one 10GGPON, and be connected at least one Optical Distribution Network (optical distribution network by trunk fiber (referring to that WDM is to the optical fiber between Optical Distribution Network), ODN), for by GEPON with 10GGPON downlink optical signal is multiplexing and by GEPON and 10GGPON uplink optical signal demultiplexing.GEPON optical network unit (OpticalNetwork Unit after optical splitter (splitter) (can have one or more) in this Optical Distribution Network narrows with one or more uplink optical signal bandwidth of operation, ONU) connect, described optical splitter is also connected with one or more 10GGPON optical network units.
GEPON optical network unit comprises Optical Receivers and optical transmission module, the present embodiment is when to existing GEPON smooth upgrade, except increasing smooth upgrade wavelength division multiplexer, 10GGPON optical line terminal is with 10GGPON optical network unit and outside being connected by mode shown in Fig. 1 (a), can utilize the optical line terminal in existing GEPON system, trunk fiber and Optical Distribution Network, and (be also the up bandwidth of operation of GEPON optical network unit by the bandwidth of operation that sends the optical transmission module of uplink optical signal in GEPON optical network unit, determine the bandwidth of operation of GEPON uplink optical signal in this symbiotic system) be narrowed to and the non-overlapping scope of bandwidth of operation of 10GGPON uplink optical signal, generally be narrowed in the scope of 1290nm～1360nm, the present embodiment is taking 1290nm～1360nm as example, but can be also 1290nm～1330nm, 1300nm～1340nm etc.This optical transmission module can adopt Fabry-Perot (Fabry-perot, the FP) laser that industry is general, also can pass through distributed feedback laser (Distributed Feedback, DFB) and realize.Optical transmission module in Optical Receivers in GEPON optical network unit and 10GGPON optical network unit and the light signal bandwidth of operation of Optical Receivers are all constant.The symbiotic system of the present embodiment can be also newly-built.
Based on above symbiotic system, at up direction, the uplink optical signal of 1260nm to the 1280nm wave band that the uplink optical signal that narrows rear 1290nm to 1360nm wave band that GEPON optical network unit sends and 10GGPON optical network unit send is after optical splitter merges, be input to wavelength division multiplexer through trunk fiber, wavelength division multiplexer to GEPON uplink optical signal and 10GGPON uplink optical signal demultiplexing after, be input to respectively GEPON optical line terminal and 10GGPON optical line terminal; At down direction, the downlink optical signal of the downlink optical signal of GEPON optical line terminal and 10GGPON optical line terminal is input in Optical Distribution Network through trunk fiber after wavelength division multiplexer is multiplexing, optical splitter is by after the light signal light splitting of this wavelength division multiplexing, GEPON downlink optical signal is assigned to GEPON optical network unit, and 10GGPON downlink optical signal is assigned to 10GGPON optical network unit.
Fig. 1 (b) is in the spectrogram of the present embodiment symbiotic system, and as can be seen from the figure, the bandwidth of operation of GEPON and 10GGPON does not conflict.
Conversion a little on the basis of the first embodiment, can obtain two following change examples:
First becomes example
The symbiotic system that this change example is GPON and 10GEPON, only the 10GGPON optical line terminal in Fig. 1 (a) and 10GGPON optical network unit need to be replaced with respectively to 10GEPON optical line terminal and 10GEPON optical network unit, and GEPON optical line terminal and GEPON optical network unit are replaced with respectively to GPON optical line terminal and GPON optical network unit, can obtain the structure of this change example as shown in Fig. 1 (c).The method of this change example from GPON to 10GEPON smooth upgrade also only need be replaced and can obtain the type of the above-mentioned optical line terminal the smooth upgrading method of the first embodiment and optical network unit.
In this symbiotic system, the bandwidth of operation of the bandwidth of operation of GPON downlink optical signal, the uplink optical signal of 10GEPON and downlink optical signal is all constant.The bandwidth of operation of the uplink optical signal that the optical transmission module in GPON optical network unit sends narrows to the scope of 1290nm to 1360nm.Due to the bandwidth of operation of 10GEPON and 10GGPON, GPON is identical or basic identical with the bandwidth of operation of GEPON, and (bandwidth range of 10GGPON downlink optical signal is not also finally determined, but difference can not cause the conflict of two kinds of EPON bandwidth of operation), therefore the operation principle of this change example is identical with the first embodiment, repeats no more.Its spectrogram is shown in Fig. 1 (d).
Optical transmission module in some existing GPON optical network unit adopts GPON Class C+ (without general Chinese translation) module, and the bandwidth of operation scope of the uplink optical signal that this module sends is 1290nm to 1330nm, has narrowed.Now again these GPON optical network units are changed with regard to not needing.The optical transmission module of the GPON optical network unit that the bandwidth of operation scope of other uplink optical signals comprises 1260nm to 1280nm, also can be replaced by this GPON Class C+ module and avoid bandwidth of operation conflict.The second GPON optical network unit becoming in example is also like this.
Second becomes example
The symbiotic system that this change example is GPON and 10GGPON, only the GEPON optical line terminal in Fig. 1 (a) and GEPON optical network unit need to be replaced with respectively to GPON optical line terminal and GPON optical network unit, can obtain the structure of this change example as shown in Fig. 1 (e).The method of this change example from GPON to 10GGPON smooth upgrade also only need be replaced and can obtain the type of the above-mentioned optical line terminal the smooth upgrading method of the first embodiment and optical network unit.
In this symbiotic system, the uplink optical signal of the bandwidth of operation of GPON downlink optical signal, 10GGPON and the bandwidth of operation of downlink optical signal are all constant.The bandwidth of operation of the uplink optical signal that in GPON optical network unit, optical transmission module sends narrows to the scope of 1290nm to 1360nm.The operation principle of this change example is identical with the first embodiment, repeats no more here.Its spectrogram is shown in Fig. 1 (f).
The second embodiment
Fig. 2 (a) shows the structure of the present embodiment GEPON and 10GGPON symbiotic system, this symbiotic system comprises for by GEPON with 10GGPON downlink optical signal is multiplexing and by the wavelength division multiplexer of GEPON and 10GGPON uplink optical signal demultiplexing, this WDM is connected with the optical line terminal of at least one GEPON and the optical line terminal of at least one 10GGPON, and is connected at least one Optical Distribution Network by trunk fiber.
Different from the first embodiment is, the present embodiment is in the time of upgrading, except increasing smooth upgrade wavelength division multiplexer, 10GGPON optical line terminal is with 10GGPON optical network unit and outside being connected by mode shown in Fig. 2 (a), without the bandwidth of operation of the uplink optical signal of GEPON optical network unit is narrowed, but after the existing optical splitter of Optical Distribution Network, one or more for narrowing wavelength shifter (the wavelength converter of uplink optical signal bandwidth of operation in connection, WC), this wavelength shifter should not have any impact to downlink optical signal, both this wavelength shifter should separate with down link or downlink optical signal be realized to transparent transmission.One end that this wavelength shifter bandwidth of operation is narrowed is connected to existing optical splitter, the other end is connected to one or more newly-increased optical splitters, newly-increased optical splitter is connected with one or more GEPON optical network units again, reallocate with the GEPON downlink optical signal to after light splitting, and be input to wavelength shifter after the uplink optical signal of connected GEPON optical network unit is merged.
The wavelength shifter that these newly increase and optical splitter are considered as a part for Optical Distribution Network, in order to express easily, optical splitter between wavelength shifter and GEPON optical network unit is called to the second dispensing section optical splitter, the optical splitter between wavelength shifter and trunk fiber is called to the first dispensing section optical splitter.The 10GGPON optical network unit increasing in symbiotic system is directly connected (by this principle, the optical splitter in the first embodiment Optical Distribution Network is the first dispensing section optical splitter) with the first dispensing section optical splitter.Can find out, this symbiotic system can utilize optical line terminal, Optical Distribution Network and the optical network unit in existing GEPON system, and the uplink and downlink bandwidth of operation of GEPON optical network unit and 10GGPON optical network unit does not all need to change.Certainly, above-mentioned symbiotic system can be also newly-built.
For avoiding conflicting with the bandwidth of operation of 10GGPON optical network unit uplink optical signal, wavelength shifter should be narrowed to the bandwidth of operation of the uplink optical signal of received GEPON optical network unit in the scope that does not comprise 10GGPON uplink optical signal bandwidth of operation, being generally in the scope of 1290nm to 1360nm, can be also certain wave band within the scope of this.This wavelength shifter can adopt photoelectricity light (OpticalElectrical Optical, or All Optical Wavelength Conversion (All Optical Wavelength converter OEO), AOWC) device is realized, but also can adopt any device with wavelength translation function to realize, wavelength shifter does not process the wavelength of downlink optical signal.
Based on above-mentioned symbiotic system, at up direction, the uplink optical signal of 1260nm to the 1360nm wave band that each GEPON optical network unit sends is first sent into wavelength shifter after the second dispensing section optical splitter merges, the uplink optical signal of wave band after conversion in 1290nm to 1360nm scope sent into the first dispensing section optical splitter again, with 10GGPON optical network unit send 1260nm to 1280nm wave band uplink optical signal merge, light signal after merging is input to wavelength division multiplexer through trunk fiber, wavelength division multiplexer to GEPON uplink optical signal and 10GGPON uplink optical signal demultiplexing after, be input to respectively GEPON optical line terminal and 10GGPON optical line terminal,
At down direction, the downlink optical signal of GEPON optical line terminal and 10GGPON optical line terminal is input in Optical Distribution Network through trunk fiber after wavelength division multiplexer is multiplexing, by the first dispensing section optical splitter by after the light signal light splitting of this wavelength division multiplexing, the GEPON downlink optical signal obtaining is again through wavelength shifter and the second dispensing section optical splitter light splitting, then be assigned to each GEPON optical network unit, the 10GGPON downlink optical signal that the first dispensing section optical splitter light splitting obtains is directly assigned to each 10GGPON optical network unit.
Fig. 2 (b) is in the spectrogram of the present embodiment symbiotic system, and as can be seen from the figure, the bandwidth of operation of GEPON and 10GGPON does not conflict.
Compared with the first embodiment, the present embodiment is converted the uplink optical signal of multiple GEPON optical network units by wavelength shifter unification, in the time that GEPON optical network unit is more, for convenience with cost-saving.
Conversion a little on the basis of the second embodiment, can obtain two following change examples:
First becomes example
The symbiotic system that this change example is GPON and 10GEPON, only the 10GGPON optical line terminal in Fig. 2 (a) and 10GGPON optical network unit need to be replaced with respectively to 10GEPON optical line terminal and 10GEPON optical network unit, and GEPON optical line terminal and GEPON optical network unit are replaced with respectively to GPON optical line terminal and GPON optical network unit, can obtain the structure of this change example as shown in Fig. 2 (c).The method of this change example from GPON to 10GEPON smooth upgrade also only need be replaced and can obtain the type of the above-mentioned optical line terminal the smooth upgrading method of the second embodiment and optical network unit.
In this symbiotic system, the bandwidth of operation of GPON and 10GEPON is all constant, and the bandwidth of operation of the uplink optical signal each GPON optical network unit being sent by wavelength shifter narrows to the scope of 1290nm to 1360nm avoids bandwidth of operation conflict.The operation principle of this change example is identical with the second embodiment, repeats no more.Its spectrogram is shown in Fig. 2 (d).
Second becomes example
The symbiotic system that this change example is GPON and 10GGPON, only the GEPON optical line terminal in Fig. 2 (a) and GEPON optical network unit need to be replaced with respectively to GPON optical line terminal and GPON optical network unit, can obtain the structure of this change example as shown in Fig. 2 (e).The method of this change example from GPON to 10GGPON smooth upgrade also only need be replaced and can obtain the type of the above-mentioned optical line terminal the smooth upgrading method of the first embodiment and optical network unit.
In this symbiotic system, the bandwidth of operation of GPON and 10GEPON is all constant, and the bandwidth of operation of the uplink optical signal each GPON optical network unit being sent by wavelength shifter narrows to the scope of 1290nm to 1360nm avoids bandwidth of operation conflict.The operation principle of this change example is identical with the second embodiment, repeats no more here.Its spectrogram is shown in Fig. 2 (f).
It should be noted that, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although the present invention is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can modify or be equal to replacement technical scheme of the present invention, and not departing from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of claim scope of the present invention.
For example:
The technical scheme of above-mentioned the first embodiment and the second embodiment also can application simultaneously in a system.As at above-described embodiment and become in routine symbiotic system, the bandwidth of operation of the uplink optical signal that optical transmission module in part GEPON or GPON optical network unit is sent narrows to the scope of 1290nm to 1360nm.The bandwidth of operation of the GEPON of other parts or GPON optical network unit is constant, but need between these GEPON or GPON optical network unit and Optical Distribution Network the first dispensing section optical splitter (being the optical splitter of existing Optical Distribution Network when smooth upgrade), add the second dispensing section optical splitter and wavelength shifter, can be converted the uplink optical signal of multiple GEPON optical network units by wavelength shifter unification.
In addition, also can there is the existing passive optical-fiber network of bandwidth conflict and the symbiotic system of next-generation passive optical network for other in such scheme, on existing Optical Distribution Network, the light signal of two kinds of EPONs is carried out to wavelength division multiplexing, and by narrowing wherein a kind of bandwidth of operation of passive optical network signal, ensure that the bandwidth of operation of two kinds of EPONs is not overlapping.Just can realize the smooth upgrade of existing passive optical-fiber network to next-generation passive optical network, and improve bandwidth availability ratio.
Claims (6)
1. the symbiotic system of an existing passive optical-fiber network and next-generation passive optical network, the bandwidth of operation of described existing passive optical-fiber network and the defined uplink optical signal of next-generation passive optical network is overlapping, this symbiotic system comprises trunk fiber, Optical Distribution Network, one or more first optical line terminals of existing passive optical-fiber network and one or more first optical network units of existing passive optical-fiber network, is characterized in that:
Also comprise one or more second optical line terminals of next-generation passive optical network and one or more second optical network units of next-generation passive optical network, and the wavelength division multiplexer being connected with described trunk fiber, the first optical line terminal and the second optical line terminal, described the second optical network unit is connected with described Optical Distribution Network;
Described Optical Distribution Network and/or described the first optical network unit are narrowed to the bandwidth of operation of existing passive optical network uplink light signal in the non-overlapping scope of bandwidth of operation with next-generation passive optical network uplink optical signal;
In all the first optical network units, send uplink optical signal optical transmission module bandwidth of operation all with the non-overlapping scope of bandwidth of operation of next-generation passive optical network uplink optical signal in; Or
Described Optical Distribution Network comprises the first dispensing section optical splitter being connected with trunk fiber, the second dispensing section optical splitter, and be connected to the wavelength shifter between the first dispensing section optical splitter and the second dispensing section optical splitter, all the first optical network units are all connected to the second dispensing section optical splitter, described wavelength shifter is narrowed in the non-overlapping scope of bandwidth of operation with next-generation passive optical network uplink optical signal for the bandwidth of operation of uplink optical signal that the first optical network unit is sent through the second dispensing section optical splitter, output to again the first dispensing section optical splitter, and described wavelength shifter is to downlink optical signal transparent transmission, the second optical network unit is directly connected with the first dispensing section optical splitter, or
In part the first optical network unit, send uplink optical signal optical transmission module bandwidth of operation with the non-overlapping scope of bandwidth of operation of next-generation passive optical network uplink optical signal in; Described Optical Distribution Network comprises the first dispensing section optical splitter being connected with trunk fiber, the second dispensing section optical splitter being connected with all the other first optical network units, and be connected to the wavelength shifter between the first dispensing section optical splitter and the second dispensing section optical splitter; Described wavelength shifter is narrowed in the non-overlapping scope of bandwidth of operation with next-generation passive optical network uplink optical signal for the bandwidth of operation of uplink optical signal that all the other first optical network units are sent through the second dispensing section optical splitter, output to again the first dispensing section optical splitter, and described wavelength shifter is to downlink optical signal transparent transmission; Described the second optical network unit is connected with the first dispensing section optical splitter.
2. symbiotic system as claimed in claim 1, is characterized in that:
Described existing passive optical-fiber network is gigabit ethernet passive optical network (GEPON), and described next-generation passive optical network is 10G gigabit passive optical network (10GGPON); Or
Described existing passive optical-fiber network is gigabit passive optical network (GPON), and described next-generation passive optical network is 10G Ethernet passive optical network (10GEPON); Or
Described existing passive optical-fiber network is gigabit passive optical network (GPON), and described next-generation passive optical network is 10G gigabit passive optical network (10GGPON).
3. symbiotic system as claimed in claim 2, is characterized in that:
Described and the non-overlapping scope of bandwidth of operation next-generation passive optical network uplink optical signal refers to 1290nm～1360nm.
4. the method from existing passive optical-fiber network to next-generation passive optical network smooth upgrade, being used for is the symbiotic system of existing passive optical-fiber network and next-generation passive optical network by existing passive optical-fiber network smooth upgrade, the Optical Distribution Network that this existing passive optical-fiber network comprises trunk fiber, is connected with described trunk fiber, one or more the first optical line terminals and one or more the first optical network unit, and with the bandwidth of operation of the defined uplink optical signal of this next-generation passive optical network is overlapping, the method comprises:
Set up one or more wavelength division multiplexers, and one or more second optical line terminals of next-generation passive optical network and one or more second optical network units of next-generation passive optical network, described wavelength division multiplexer is connected with described trunk fiber, the first optical line terminal and the second optical line terminal, described the second optical network unit is connected with described Optical Distribution Network;
By the transformation to described Optical Distribution Network and/or described the first optical network unit, the bandwidth of operation of existing passive optical network uplink light signal is narrowed in the non-overlapping scope of bandwidth of operation with next-generation passive optical network uplink optical signal;
Described to the one in the transformation in the following ways of described Optical Distribution Network and/or described the first optical network unit:
The first, is narrowed to the bandwidth of operation that sends the optical transmission module of uplink optical signal in all the first optical network units in the non-overlapping scope of bandwidth of operation with next-generation passive optical network uplink optical signal;
The second, in Optical Distribution Network, set up at least one wavelength shifter and at least one second dispensing section optical splitter, one end that described wavelength shifter wavelength is narrowed is connected with original the first dispensing section optical splitter in Optical Distribution Network, the other end is connected with the second dispensing section optical splitter, all the first optical network units are all connected to the second dispensing section optical splitter, the bandwidth of operation of described wavelength shifter is sent the first optical network unit uplink optical signal through the second dispensing section optical splitter is narrowed in the non-overlapping scope of bandwidth of operation with next-generation passive optical network uplink optical signal, output to again the first dispensing section optical splitter, and described wavelength shifter is to downlink optical signal transparent transmission, the second optical network unit is directly connected with the first dispensing section optical splitter,
The third, be narrowed to the bandwidth of operation that sends the optical transmission module of uplink optical signal in part the first optical network unit in the non-overlapping scope of bandwidth of operation with next-generation passive optical network uplink optical signal, simultaneously, in Optical Distribution Network, set up at least one wavelength shifter and at least one second dispensing section optical splitter, one end that described wavelength shifter wavelength is narrowed is connected with original the first dispensing section optical splitter in Optical Distribution Network, the other end is connected with the second dispensing section optical splitter, all the other first optical network units are connected to the second dispensing section optical splitter, the bandwidth of operation of described wavelength shifter is sent all the other first optical network units uplink optical signal through the second dispensing section optical splitter is narrowed in the non-overlapping scope of bandwidth of operation with next-generation passive optical network uplink optical signal, output to again the first dispensing section optical splitter, and described wavelength shifter is to downlink optical signal transparent transmission, the second optical network unit is directly connected with the first dispensing section optical splitter.
5. method as claimed in claim 4, is characterized in that:
Described existing passive optical-fiber network is gigabit ethernet passive optical network (GEPON), and described next-generation passive optical network is 10G gigabit passive optical network (10GGPON); Or
Described existing passive optical-fiber network is gigabit passive optical network (GPON), and described next-generation passive optical network is 10G Ethernet passive optical network (10GEPON); Or
Described existing passive optical-fiber network is gigabit passive optical network (GPON), and described next-generation passive optical network is 10G gigabit passive optical network (10GGPON).
6. method as claimed in claim 5, is characterized in that:
Described and the non-overlapping scope of bandwidth of operation next-generation passive optical network uplink optical signal refers to 1290nm～1360nm.
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| CN102480651B (en) * | 2010-11-23 | 2015-07-22 | 中兴通讯股份有限公司 | Multi-rate optical signal transmission method, multi-rate optical signal transmission system and optical network unit |
| CN102143059B (en) * | 2010-12-20 | 2014-01-01 | 华为技术有限公司 | Uplink broadband allocation method, system and equipment for 10G Ethernet passive optical network (EPON) |
| CN102547491B (en) | 2010-12-29 | 2015-12-16 | 中兴通讯股份有限公司 | Optical line terminal, optical network unit and passive optical network |
| CN102333025A (en) * | 2011-06-07 | 2012-01-25 | 聂义林 | Broadcasting and television two-way network system and smooth bandwidth-upgrading method thereof |
| CN102427566B (en) * | 2011-11-15 | 2015-07-08 | 中国联合网络通信集团有限公司 | Coexistence and evolution method and system from traditional optical network to target optical network |
| CN102572619B (en) * | 2011-12-16 | 2018-03-02 | 中兴通讯股份有限公司 | Passive optical network, optical line terminal and optical transmission method |
| CN103901551B (en) * | 2012-12-27 | 2016-08-03 | 中国电信股份有限公司 | The wavelength-division multiplex method of the joints of optical fibre and optical signal |
| CN103546834B (en) * | 2013-10-31 | 2016-06-01 | 烽火通信科技股份有限公司 | XG-PON and GPON realizes the system and method coexisted in ODN |
| CN103957475A (en) * | 2014-04-11 | 2014-07-30 | 烽火通信科技股份有限公司 | Networking system allowing GPON and XG-PON to be concomitant and application |
| CN110769331B (en) | 2018-07-27 | 2022-03-29 | 中兴通讯股份有限公司 | Line card, design method, communication control method, device and storage medium |
| EP4104318A4 (en) * | 2020-02-12 | 2024-03-13 | CommScope Technologies LLC | Systems, devices and methods for adding capacity to a fiber optic network |
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