CN101877798A - 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 the optical access network communication field, relate in particular to the symbiotic system and the smooth upgrading method of a kind of existing passive optical-fiber network and next-generation passive optical network.
Background technology
Present Technology of Light Access Network all be 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 refer to gigabit ethernet passive optical network (Gigabit Ethemet Passive Optical Network, GEPON).But, along with people to the improving constantly of bandwidth requirement, and proposed that many nets merge and requirements such as multiple service supporting, existing GEPON and GPON can't satisfy these demands, therefore need to existing optical access network upgrading with upgrade.At present, support the next-generation passive optical network of higher rate such as the relevant criterion of 10Gbps EPON (10GEPON) and 10Gbps GPON (10GGPON) to set up perfect substantially, especially 10GEPON, the two corresponding commercial product also has been in the development phase simultaneously.However, however in the quite a long time from now on the next-generation passive optical network technology can not replace existing GEPON/GPON technology fully.Therefore, press for 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 the 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 the O-wave band, and bandwidth range is at 1260nm to 1280nm; Downlink optical signal is operated in L-band, and bandwidth range is at 1574nm to 1580nm.As seen, 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, the 10GGPON coexistence solves the bandwidth conflict problem of uplink optical signal with regard to needs.
Industry has proposed the scheme to the 10GEPON upgrading from GEPON at present, because these two kinds of EPON downlink optical signal wavelength of standard code are different, so 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, needs to adopt time-multiplexed mode to realize compatibility.Though adopt time-multiplexed mode also can realize sharing of Optical Distribution Network, sacrificed bandwidth, and need carry out having increased technical difficulty and production cost synchronously between the EPON of two kinds of speed.
Realize from GEPON to 10GGPON, from GPON to 10GGPON, also have same problem to the smooth evolution of 10GEPON from GPON.
Summary of the invention
The technical problem to be solved in the present invention provides 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 that is connected with described trunk fiber, first optical line terminal and second optical line terminal, described second optical network unit is connected with described Optical Distribution Network;
Described Optical Distribution Network and/or described first optical network unit with the bandwidth of operation of existing passive optical network uplink light signal be narrowed to the non-overlapping scope of the bandwidth of operation of next-generation passive optical network uplink optical signal in.
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); Perhaps
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); Perhaps
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 the 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:
Send in all first optical network units uplink optical signal optical transmission module bandwidth of operation all with the non-overlapping scope of the 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 that is connected with trunk fiber, the second dispensing section optical splitter, and be connected wavelength shifter between the first dispensing section optical splitter and the second dispensing section optical splitter, all first optical network units all are connected to the second dispensing section optical splitter, described wavelength shifter be used for first optical network unit through the bandwidth of operation of the uplink optical signal that the second dispensing section optical splitter is sent be narrowed to the non-overlapping scope of the bandwidth of operation of next-generation passive optical network uplink optical signal in, output to the first dispensing section optical splitter again, and described wavelength shifter is to the downlink optical signal transparent transmission; Second optical network unit directly is connected with the first dispensing section optical splitter.
Further, above-mentioned symbiotic system also can have following characteristics:
Send in part first optical network unit uplink optical signal optical transmission module bandwidth of operation with the non-overlapping scope of the bandwidth of operation of next-generation passive optical network uplink optical signal in;
Described Optical Distribution Network comprises the first dispensing section optical splitter that is connected with trunk fiber, the second dispensing section optical splitter that is connected with all the other first optical network units, and be connected wavelength shifter between the first dispensing section optical splitter and the second dispensing section optical splitter; Described wavelength shifter be used for all the other first optical network units through the bandwidth of operation of the uplink optical signal that the second dispensing section optical splitter is sent be narrowed to the non-overlapping scope of the bandwidth of operation of next-generation passive optical network uplink optical signal in, output to the first dispensing section optical splitter again, and described wavelength shifter is to the downlink optical signal transparent transmission;
Described 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, provided from GEPON to 10GGPON, from GPON to 10GGPON, from GPON to the 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 provides a kind ofly can avoid the bandwidth conflict of two kinds of EPONs from the method for existing passive optical-fiber network to the next-generation passive optical network smooth upgrade, and makes full use of bandwidth.
In order to address the above problem, the invention provides a kind of from the method for existing passive optical-fiber network to the next-generation passive optical network smooth upgrade, being used for existing passive optical-fiber network smooth upgrade is the symbiotic system of existing passive optical-fiber network and next-generation passive optical network, this existing passive optical-fiber network comprises trunk fiber, the Optical Distribution Network that is connected with described trunk fiber, one or more first optical line terminals and one or more first optical network unit, and and the bandwidth of operation of the defined uplink optical signal of this next-generation passive optical network is overlapping, and this method comprises:
Set up one or more wavelength division multiplexers, and one or more second optical network units of one or more second optical line terminals of next-generation passive optical network and next-generation passive optical network, described wavelength multiplexer is connected with described trunk fiber, first optical line terminal and second optical line terminal, described second optical network unit is connected with described Optical Distribution Network;
By transformation to described Optical Distribution Network and/or described first optical network unit, with the bandwidth of operation of existing passive optical network uplink light signal be narrowed to the non-overlapping scope of the bandwidth of operation of next-generation passive optical network uplink optical signal in.
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); Perhaps
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); Perhaps
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 the bandwidth of operation next-generation passive optical network uplink optical signal refers to 1290nm～1360nm.
Further, said method also can have following characteristics: a kind of with in the upper type adopted in described transformation to described Optical Distribution Network and/or described first optical network unit:
First kind, with the bandwidth of operation that sends the optical transmission module of uplink optical signal in all first optical network units be narrowed to the non-overlapping scope of the bandwidth of operation of next-generation passive optical network uplink optical signal in;
Second kind, in Optical Distribution Network, set up at least one wavelength shifter and at least one second dispensing section optical splitter, the end that described wavelength shifter wavelength is narrowed is connected with original first dispensing section optical splitter in the Optical Distribution Network, the other end is connected with the second dispensing section optical splitter, all first optical network units all are connected to the second dispensing section optical splitter, described wavelength shifter with first optical network unit through the bandwidth of operation of the uplink optical signal that the second dispensing section optical splitter is sent be narrowed to the non-overlapping scope of the bandwidth of operation of next-generation passive optical network uplink optical signal in, output to the first dispensing section optical splitter again, and described wavelength shifter is to the downlink optical signal transparent transmission; Second optical network unit directly is connected with the first dispensing section optical splitter;
The third, with the bandwidth of operation that sends the optical transmission module of uplink optical signal in part first optical network unit be narrowed to the non-overlapping scope of the bandwidth of operation of next-generation passive optical network uplink optical signal in; Simultaneously, in Optical Distribution Network, set up at least one wavelength shifter and at least one second dispensing section optical splitter, the end that described wavelength shifter wavelength is narrowed is connected with original first dispensing section optical splitter in the 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, described wavelength shifter with all the other first optical network units through the bandwidth of operation of the uplink optical signal that the second dispensing section optical splitter is sent be narrowed to the non-overlapping scope of the bandwidth of operation of next-generation passive optical network uplink optical signal in, output to the first dispensing section optical splitter again, and described wavelength shifter is to the downlink optical signal transparent transmission; Second optical network unit directly is connected with the first dispensing section optical splitter.
Above-mentionedly can avoid the bandwidth conflict of two kinds of EPONs and make full use of bandwidth to the method for next-generation passive optical network smooth upgrade from the existing passive optical-fiber network.In each execution mode, provided from GEPON to 10GGPON, from GPON to 10GGPON, from the smooth upgrading method of GPON to 10GEPON, can provide the subsequent network compatibility to the GEPON/GPON system that has disposed, realized TDM-PON symbiotic system simple, reliable, workable and that upgrade cost is low, and when realizing smooth evolution, can utilize original GEPON/GPON resource as far as possible.
Description of 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);
Fig. 1 (c) is that first of first embodiment of the invention becomes example, the schematic diagram of GPON and 10GEPON symbiotic system;
Fig. 1 (d) is the frequency spectrum profile of symbiotic system among Fig. 1 (c);
Fig. 1 (e) is that second of first embodiment of the invention becomes example, 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);
Fig. 2 (c) is that first of second embodiment of the invention becomes example, 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);
Fig. 2 (e) is that second of second embodiment of the invention becomes example, 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.
First embodiment
Fig. 1 (a) shows the structure of present embodiment GEPON and 10GGPON symbiotic system, this symbiotic system comprises wavelength division multiplexer (Wave Division Multiplexer, WDM), the optical line terminal of this WDM and at least one GEPON (Optical Line Terminal, 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), be used for GEPON and the 10GGPON downlink optical signal is multiplexing and with GEPON and 10GGPON uplink optical signal demultiplexing.GEPON optical network unit (Optical Network Unit after optical splitter in this Optical Distribution Network (splitter) (can have one or more) narrows with one or more uplink optical signal bandwidth of operation, ONU) connect, described optical splitter also is connected with one or more 10GGPON optical network units.
Comprise Optical Receivers and optical transmission module in the GEPON optical network unit, present embodiment is to existing GEPON smooth upgrade the time, except increasing the smooth upgrade wavelength division multiplexer, outside the 10GGPON optical line terminal is connected with the 10GGPON optical network unit and by mode shown in Fig. 1 (a), can utilize the optical line terminal in the existing GEPON system, trunk fiber and Optical Distribution Network, and (also be the up bandwidth of operation of GEPON optical network unit with the bandwidth of operation that sends the optical transmission module of uplink optical signal in the GEPON optical network unit, determined the bandwidth of operation of GEPON uplink optical signal in this symbiotic system) be narrowed to and the non-overlapping scope of the bandwidth of operation of 10GGPON uplink optical signal, generally be narrowed in the scope of 1290nm～1360nm, present embodiment is an example with 1290nm～1360nm, but also can be 1290nm～1330nm, 1300nm～1340nm or the like.This optical transmission module can adopt the general Fabry-Perot of industry, and ((Distributed Feedback DFB) realizes also can to pass through distributed feed-back formula laser for Fabry-perot, FP) laser.The optical transmission module in Optical Receivers in the GEPON optical network unit and the 10GGPON optical network unit and the light signal bandwidth of operation of Optical Receivers are all constant.The symbiotic system of present embodiment also can be newly-built.
Based on above symbiotic system, at up direction, the uplink optical signal of 1260nm to the 1280nm wave band that uplink optical signal that narrows back 1290nm to 1360nm wave band that the 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 GEPON optical line terminal and 10GGPON optical line terminal respectively; 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 the Optical Distribution Network through the multiplexing after trunk fiber of wavelength division multiplexer, after the light signal beam split of optical splitter with this wavelength division multiplexing, the GEPON downlink optical signal is assigned to the GEPON optical network unit, and the 10GGPON downlink optical signal is assigned to the 10GGPON optical network unit.
Fig. 1 (b) is in the spectrogram of present embodiment symbiotic system, and as can be seen from the figure, the bandwidth of operation of GEPON and 10GGPON is conflict not.
Conversion a little on the basis of first embodiment can obtain two following change examples:
First becomes example
This becomes the symbiotic system of example into GPON and 10GEPON, only 10GGPON optical line terminal among Fig. 1 (a) and 10GGPON optical network unit need be replaced with 10GEPON optical line terminal and 10GEPON optical network unit respectively, and GEPON optical line terminal and GEPON optical network unit replaced with GPON optical line terminal and GPON optical network unit respectively, can obtain the structure of this change example shown in Fig. 1 (c).This change example also only needs the type of above-mentioned optical line terminal the smooth upgrading method of first embodiment and optical network unit is replaced and can be obtained to the method for 10GEPON smooth upgrade from GPON.
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 the GPON optical network unit sends narrows to the scope of 1290nm to 1360nm.Because the bandwidth of operation of 10GEPON and 10GGPON, the bandwidth of operation of GPON and GEPON is identical or basic identical, and (bandwidth range of 10GGPON downlink optical signal is also determined at last, but difference can not cause the conflict of two kinds of EPON bandwidth of operation), the operation principle that therefore should become example is identical with 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+ (no general Chinese translation) module, and the bandwidth of operation scope of the uplink optical signal that this module sends is 1290nm to 1330nm, has promptly narrowed.To these GPON optical network units changed with regard to not needing this moment again.The bandwidth of operation scope of other uplink optical signals comprises the optical transmission module of the GPON optical network unit of 1260nm to 1280nm, also can be replaced by this GPON Class C+ module and avoid the bandwidth of operation conflict.The second GPON optical network unit that becomes in the example also is like this.
Second becomes example
This becomes the symbiotic system of example into GPON and 10GGPON, only GEPON optical line terminal among Fig. 1 (a) and GEPON optical network unit GPON optical line terminal and GPON optical network unit need be replaced with respectively, the structure of this change example shown in Fig. 1 (e) can be obtained.This change example also only needs the type of above-mentioned optical line terminal the smooth upgrading method of first embodiment and optical network unit is replaced and can be obtained to the method for 10GGPON smooth upgrade from GPON.
The bandwidth of operation of the uplink optical signal of the bandwidth of operation of GPON downlink optical signal, 10GGPON and downlink optical signal is all constant in this symbiotic system.The bandwidth of operation of the uplink optical signal that optical transmission module sends in the GPON optical network unit narrows to the scope of 1290nm to 1360nm.This operation principle that becomes example is identical with first embodiment, repeats no more here.Its spectrogram is shown in Fig. 1 (f).
Second embodiment
Fig. 2 (a) shows the structure of present embodiment GEPON and 10GGPON symbiotic system, this symbiotic system comprises and is used for GEPON and the 10GGPON downlink optical signal is multiplexing and with 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 with first embodiment is, present embodiment is when upgrading, except increasing the smooth upgrade wavelength division multiplexer, outside the 10GGPON optical line terminal is connected with the 10GGPON optical network unit and by mode shown in Fig. 2 (a), need not 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 wavelength shifter (wavelength converter that are used to narrow the uplink optical signal bandwidth of operation in the connection, WC), this wavelength shifter should not have any impact to downlink optical signal, and both this wavelength shifter should separate with down link or downlink optical signal is realized transparent transmission.The 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, with to reallocating, and be input to wavelength shifter after the uplink optical signal of the GEPON optical network unit that connected merged through the GEPON downlink optical signal after the beam split.
Wavelength shifter that these increase newly and optical splitter are considered as the part of Optical Distribution Network, in order to express easily, optical splitter between wavelength shifter and the GEPON optical network unit is called the second dispensing section optical splitter, the optical splitter between wavelength shifter and the trunk fiber is called the first dispensing section optical splitter.The 10GGPON optical network unit that increases in the symbiotic system directly is 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.As can be seen, this symbiotic system can utilize optical line terminal, Optical Distribution Network and the optical network unit in the existing GEPON system, and the uplink and downlink bandwidth of operation of GEPON optical network unit and 10GGPON optical network unit all need not change.Certainly, above-mentioned symbiotic system also can be 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 the GEPON optical network unit that received in the scope that does not comprise 10GGPON uplink optical signal bandwidth of operation, being generally in the scope of 1290nm to 1360nm, also can be certain wave band in this scope.This wavelength shifter can adopt photoelectricity light (Optical Electrical Optical, OEO) or All Optical Wavelength Conversion (All Optical Wavelength converter, AOWC) device is realized, but also can adopt any device to realize that wavelength shifter does not process the wavelength of downlink optical signal with wavelength Conversion function.
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 sent into wavelength shifter earlier after the second dispensing section optical splitter merges, the uplink optical signal of wave band after the conversion in 1290nm to 1360nm scope sent into the first dispensing section optical splitter again, the uplink optical signal of 1260nm to the 1280nm wave band that sends with the 10GGPON optical network unit merges, light signal after the 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 GEPON optical line terminal and 10GGPON optical line terminal respectively;
At down direction, the downlink optical signal of GEPON optical line terminal and 10GGPON optical line terminal is input in the Optical Distribution Network through the multiplexing after trunk fiber of wavelength division multiplexer, after of the light signal beam split of the first dispensing section optical splitter with this wavelength division multiplexing, the GEPON downlink optical signal that obtains is again through the wavelength shifter and the second dispensing section optical splitter beam split, be assigned to each GEPON optical network unit then, the 10GGPON downlink optical signal that the first dispensing section optical splitter beam split obtains then directly is assigned to each 10GGPON optical network unit.
Fig. 2 (b) is in the spectrogram of present embodiment symbiotic system, and as can be seen from the figure, the bandwidth of operation of GEPON and 10GGPON is conflict not.
Compare with first embodiment, present embodiment carries out conversion by the wavelength shifter unification to the uplink optical signal of a plurality of GEPON optical network units, and is for a long time, comparatively more convenient and save cost at the GEPON optical network unit.
Conversion a little on the basis of second embodiment can obtain two following change examples:
First becomes example
This becomes the symbiotic system of example into GPON and 10GEPON, only 10GGPON optical line terminal among Fig. 2 (a) and 10GGPON optical network unit need be replaced with 10GEPON optical line terminal and 10GEPON optical network unit respectively, and GEPON optical line terminal and GEPON optical network unit replaced with GPON optical line terminal and GPON optical network unit respectively, can obtain the structure of this change example shown in Fig. 2 (c).This change example also only needs the type of above-mentioned optical line terminal the smooth upgrading method of second embodiment and optical network unit is replaced and can be obtained to the method for 10GEPON smooth upgrade from GPON.
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 that each GPON optical network unit is sent by wavelength shifter narrows to the scope of 1290nm to 1360nm avoids the bandwidth of operation conflict.This operation principle that becomes example is identical with second embodiment, repeats no more.Its spectrogram is shown in Fig. 2 (d).
Second becomes example
This becomes the symbiotic system of example into GPON and 10GGPON, only GEPON optical line terminal among Fig. 2 (a) and GEPON optical network unit GPON optical line terminal and GPON optical network unit need be replaced with respectively, the structure of this change example shown in Fig. 2 (e) can be obtained.This change example also only needs the type of above-mentioned optical line terminal the smooth upgrading method of first embodiment and optical network unit is replaced and can be obtained to the method for 10GGPON smooth upgrade from GPON.
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 that each GPON optical network unit is sent by wavelength shifter narrows to the scope of 1290nm to 1360nm avoids the bandwidth of operation conflict.This operation principle that becomes example is identical with 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 make amendment or be equal to replacement technical scheme of the present invention, and not breaking away from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
For example:
The technical scheme of above-mentioned first embodiment and second embodiment also can be used in a system simultaneously.As at the foregoing description and become in the symbiotic system of example, the bandwidth of operation of the uplink optical signal that optical transmission module in part GEPON or the 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 the Optical Distribution Network first dispensing section optical splitter (being the optical splitter of existing Optical Distribution Network during smooth upgrade), add second dispensing section optical splitter and the wavelength shifter, can carry out conversion to the uplink optical signal of a plurality of GEPON optical network units by the wavelength shifter unification.
In addition, such scheme also can be used for other the existing passive optical-fiber networks that have bandwidth conflict and the symbiotic system of next-generation passive optical network, light signal to two kinds of EPONs on existing Optical Distribution Network carries out wavelength division multiplexing, and, guarantee that the bandwidth of operation of two kinds of EPONs is not overlapping by narrowing wherein a kind of bandwidth of operation of passive optical network signal.Just can realize the smooth upgrade of existing passive optical-fiber network, and improve bandwidth availability ratio to next-generation passive optical network.
Claims (10)
1. the symbiotic system 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 that is connected with described trunk fiber, first optical line terminal and second optical line terminal, described second optical network unit is connected with described Optical Distribution Network;
Described Optical Distribution Network and/or described first optical network unit with the bandwidth of operation of existing passive optical network uplink light signal be narrowed to the non-overlapping scope of the bandwidth of operation of next-generation passive optical network uplink optical signal in.
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); Perhaps
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); Perhaps
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 the bandwidth of operation next-generation passive optical network uplink optical signal refers to 1290nm～1360nm.
4. as claim 1 or 2 or 3 described symbiotic systems, it is characterized in that:
Send in all first optical network units uplink optical signal optical transmission module bandwidth of operation all with the non-overlapping scope of the bandwidth of operation of next-generation passive optical network uplink optical signal in.
5. as claim 1 or 2 or 3 described symbiotic systems, it is characterized in that:
Described Optical Distribution Network comprises the first dispensing section optical splitter that is connected with trunk fiber, the second dispensing section optical splitter, and be connected wavelength shifter between the first dispensing section optical splitter and the second dispensing section optical splitter, all first optical network units all are connected to the second dispensing section optical splitter, described wavelength shifter be used for first optical network unit through the bandwidth of operation of the uplink optical signal that the second dispensing section optical splitter is sent be narrowed to the non-overlapping scope of the bandwidth of operation of next-generation passive optical network uplink optical signal in, output to the first dispensing section optical splitter again, and described wavelength shifter is to the downlink optical signal transparent transmission; Second optical network unit directly is connected with the first dispensing section optical splitter.
6. as claim 1 or 2 or 3 described symbiotic systems, it is characterized in that:
Send in part first optical network unit uplink optical signal optical transmission module bandwidth of operation with the non-overlapping scope of the bandwidth of operation of next-generation passive optical network uplink optical signal in;
Described Optical Distribution Network comprises the first dispensing section optical splitter that is connected with trunk fiber, the second dispensing section optical splitter that is connected with all the other first optical network units, and be connected wavelength shifter between the first dispensing section optical splitter and the second dispensing section optical splitter; Described wavelength shifter be used for all the other first optical network units through the bandwidth of operation of the uplink optical signal that the second dispensing section optical splitter is sent be narrowed to the non-overlapping scope of the bandwidth of operation of next-generation passive optical network uplink optical signal in, output to the first dispensing section optical splitter again, and described wavelength shifter is to the downlink optical signal transparent transmission;
Described second optical network unit is connected with the first dispensing section optical splitter.
7. one kind from the method for existing passive optical-fiber network to the next-generation passive optical network smooth upgrade, being used for existing passive optical-fiber network smooth upgrade is the symbiotic system of existing passive optical-fiber network and next-generation passive optical network, this existing passive optical-fiber network comprises trunk fiber, the Optical Distribution Network that is connected with described trunk fiber, one or more first optical line terminals and one or more first optical network unit, and and the bandwidth of operation of the defined uplink optical signal of this next-generation passive optical network is overlapping, and this method comprises:
Set up one or more wavelength division multiplexers, and one or more second optical network units of one or more second optical line terminals of next-generation passive optical network and next-generation passive optical network, described wavelength multiplexer is connected with described trunk fiber, first optical line terminal and second optical line terminal, described second optical network unit is connected with described Optical Distribution Network;
By transformation to described Optical Distribution Network and/or described first optical network unit, with the bandwidth of operation of existing passive optical network uplink light signal be narrowed to the non-overlapping scope of the bandwidth of operation of next-generation passive optical network uplink optical signal in.
8. method as claimed in claim 7 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); Perhaps
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); Perhaps
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).
9. method as claimed in claim 8 is characterized in that:
Described and the non-overlapping scope of the bandwidth of operation next-generation passive optical network uplink optical signal refers to 1290nm～1360nm.
10. as claim 7 or 8 or 9 described methods, it is characterized in that a kind of with in the upper type adopted in described transformation to described Optical Distribution Network and/or described first optical network unit:
First kind, with the bandwidth of operation that sends the optical transmission module of uplink optical signal in all first optical network units be narrowed to the non-overlapping scope of the bandwidth of operation of next-generation passive optical network uplink optical signal in;
Second kind, in Optical Distribution Network, set up at least one wavelength shifter and at least one second dispensing section optical splitter, the end that described wavelength shifter wavelength is narrowed is connected with original first dispensing section optical splitter in the Optical Distribution Network, the other end is connected with the second dispensing section optical splitter, all first optical network units all are connected to the second dispensing section optical splitter, described wavelength shifter with first optical network unit through the bandwidth of operation of the uplink optical signal that the second dispensing section optical splitter is sent be narrowed to the non-overlapping scope of the bandwidth of operation of next-generation passive optical network uplink optical signal in, output to the first dispensing section optical splitter again, and described wavelength shifter is to the downlink optical signal transparent transmission; Second optical network unit directly is connected with the first dispensing section optical splitter;
The third, with the bandwidth of operation that sends the optical transmission module of uplink optical signal in part first optical network unit be narrowed to the non-overlapping scope of the bandwidth of operation of next-generation passive optical network uplink optical signal in; Simultaneously, in Optical Distribution Network, set up at least one wavelength shifter and at least one second dispensing section optical splitter, the end that described wavelength shifter wavelength is narrowed is connected with original first dispensing section optical splitter in the 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, described wavelength shifter with all the other first optical network units through the bandwidth of operation of the uplink optical signal that the second dispensing section optical splitter is sent be narrowed to the non-overlapping scope of the bandwidth of operation of next-generation passive optical network uplink optical signal in, output to the first dispensing section optical splitter again, and described wavelength shifter is to the downlink optical signal transparent transmission; Second optical network unit directly is connected with the first dispensing section optical splitter.
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