CN1859810A - Passive optical network of multiple optical cut-in net shared optical fiber distribution net and realizing method - Google Patents
Passive optical network of multiple optical cut-in net shared optical fiber distribution net and realizing method Download PDFInfo
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Abstract
The present invention relates to passive optical network system, specially relating to variety technology system optical access network shared optical fiber distribution network passive optical network and implementation method. Said passive optical network includes through shared optical fiber distribution network ODN connected different system optical access network optical link terminal OLT and optical network terminal ONT, respectively corresponding different system optical access network OLT side wave long conversion filter connected between OLT and shared ODN, used for making filtering and conversion to input/output shared ODN signal, to make different system optical access network signal using different wavelength in shared ODN same direction.
Description
[technical field]
The present invention relates to passive optical network, particularly multiple technologies standard optical access network can be shared EPON and its implementation of optical fiber distributing network.
[background technology]
During at present the laying of fiber-to-the-subscriber, Fiber To The Building, Fiber To The Curb network was progressively starting, wherein passive optical network technique was a major technology.Passive optical network technique has number of different types, TPON (ITU-TG.982), APON/BPON (ITU-T G.983), EPON (IEEE802.ah), GPON (ITU-T G.984) etc.The process that is equipped with a historical evolution of dissimilar PON, the BPON that is mainly as the original laying of America and Europe, evolve to new GPON system, need carry out the laying again of ODN according to existing mode, cause new technology to be mainly used in newly-built or the reconstruction user resident, the certain customers of the sub-district that existing BPON lays are then cumbersome as using GPON, need carry out the new feeder line section and the laying of optical splitter, cause the increase of engineering cost, hindered The application of new technique to a certain extent.
[summary of the invention]
The object of the present invention is to provide a kind of passive optical network and its implementation, make multiple technologies standard optical access network can share optical fiber distributing network.
Technical scheme of the present invention is: multiple optical access network is shared the EPON of optical fiber distributing network, comprise by sharing the optical line terminal OLT and the Optical Network Terminal ONT of the continuous different systems optical access network of optical fiber distributing network ODN, also comprise and being connected between OLT and the shared ODN, long conversion of the OLT side wave of OLT and filter in the corresponding different systems optical access network of difference, and be connected between ONT and the shared ODN, long conversion of the ONT side wave of ONT and filter in the corresponding different systems optical access network of difference, be used for the signal of the shared ODN of I/O is filtered and changes, use different wave length to transmit the same direction of signal in sharing ODN of different systems optical access network.
A kind of EPON of the present invention also comprises at least one optical coupler, is connected to share between ODN and long conversion of OLT side wave and the filter.
A kind of EPON of the present invention also comprises at least one optical splitter, is connected between long conversion of described optical coupler and ONT side wave and the filter.
As another kind of embodiment of the present invention, a kind of EPON of the present invention also comprises at least one optical splitter, is connected between the ONT of long conversion of single ONT side wave and filter and a plurality of identical standard optical access networks.
The present invention also provides a kind of method of sharing optical fiber distributing network based on the multiple optical access network of above-mentioned EPON: corresponding wavelength conversion and filter are changed importing the signal of sharing ODN, use different wave length to transmit the same direction of signal in sharing ODN of different systems optical access network; Filter and change exporting the signal of sharing ODN simultaneously, corresponding light signal is input among corresponding technology standard OLT or the ONT.
Said method further comprises: in the OLT side, optical coupler is coupled to the signal between the long conversion of OLT side wave and filter and the next stage optical splitter.
The present invention also provides another kind of multiple optical access network to share the EPON of optical fiber distributing network, comprise by sharing the optical line terminal OLT and the Optical Network Terminal ONT of the continuous different systems optical access network of optical fiber distributing network ODN, also comprise and being connected between OLT and the shared ODN, the OLT sidelight code division multiplexing codec of OLT in the corresponding different systems optical access network of difference, and be connected between ONT and the shared ODN, the ONT sidelight code division multiplexing codec of ONT in the corresponding different systems optical access network of difference, be used for the signal of the shared ODN of I/O is encoded or decoded, use the different code words of quadrature to carry out coding transmission the same direction of signal in sharing ODN of different systems optical access network.
Above-mentioned EPON also comprises at least one optical coupler, is connected to share between ODN and the OLT sidelight code division multiplexing codec.
Above-mentioned EPON also comprises at least one optical splitter, is connected between described optical coupler and the ONT sidelight code division multiplexing codec.
As another kind of embodiment of the present invention, above-mentioned EPON also comprises at least one optical splitter, is connected between the ONT of single ONT sidelight code division multiplexing codec and a plurality of identical standard optical access networks.
The present invention also provides a kind of method of sharing optical fiber distributing network based on the multiple optical access network of above-mentioned second kind of EPON: corresponding Optical Code Division Multiplexing codec carries out coding/decoding to importing the signal of sharing ODN, uses the different code words of quadrature to carry out coding transmission the same direction of signal in sharing ODN of different systems optical access network; Carry out decoding/encoding to exporting the signal of sharing ODN simultaneously, corresponding light signal is input among corresponding technology standard OLT or the ONT.
Said method further comprises: in the OLT side, optical coupler is coupled to the signal between OLT sidelight code division multiplexing codec and the next stage optical splitter.
The present invention is by increasing suitable wavelength conversion and filter or Optical Code Division Multiplexing codec in existing system, make the different systems optical access network use the different code words of different wave length or quadrature in same direction (upstream or downstream), avoid the light signal conflict, make different technologies standard multi-plexing light accessing system can share optical fiber distributing network (ODN), and OLT, ONT still are operated under the original pattern and remain unchanged.Like this, carry out the transition to the multi-plexing light accessing system of another standard, do not need to lay again ODN, can farthest reduce construction investment by a kind of standard.Help applying of new technology.
[description of drawings]
Fig. 1 is the system construction drawing of first embodiment of the invention.
Fig. 2 is the system construction drawing of second embodiment of the invention.
Fig. 3 is the system construction drawing of third embodiment of the invention.
Fig. 4 is the system construction drawing of the 4th structure chart of the present invention.
[embodiment]
Below with reference to the accompanying drawings and specific embodiment, be that example is further elaborated the present invention with BPON (broadband passive optical network) and GPON (a kind of EPON) based on the original form encapsulation of various subscriber signals.
Embodiment one:
Owing to meet the BPON of ITU-TG.983.3 Wavelength Assignment standard and the provisional capital up and down of GPON system is used 1310nm wave band, 1490nm wave band respectively, if do not carry out extra process, their can can't share optical fiber distributing network (ODN) because of signal conflict.
As shown in Figure 1, a kind of EPON mainly comprises BPON OLT (optical line terminal in the present embodiment, it is as main equipment), BPON ONT (Optical Network Terminal, it is as slave unit), GPON OLT, GPON ONT, optical splitter, wavelength conversion and filter and optical coupler.As seen from the figure, the EPON of BPON and two kinds of technology standards of GPON is shared the optical distribution (ODN) that comprises optical splitter and feeder line section.We define the direction of behavior ONT to OLT, and following behavior OLT is to the direction of ONT.Then BPON OLT links to each other with at least one optical coupler with wavelength conversion and filter 2 by wavelength conversion and filter 1 respectively with GPON OLT.Optical coupler links to each other with the next stage optical splitter, and it is coupled to the light signal from above-mentioned two technology standards, sends into to share among the ODN to carry.In ONT one side, each BPON ONT and each GPON ONT link to each other with afterbody optical splitter among the ODN by wavelength conversion and filter B and wavelength conversion and filter G respectively.
Wherein, wavelength conversion between BPON ONT light mouth and the shared ODN and filter B are used for the descending 1490nm of filtering out wave band optical signal, and the light signal of descending 1310nm wave band is transformed on the 1490nm wave band carries; Wavelength conversion between GPON ONT light mouth and the shared ODN and filter G are used for the descending 1310nm of filtering out wave band optical signal, and the light signal of up 1310nm wave band is transformed on the 1490nm wave band carries; Wavelength conversion between optical coupler and the BPON OLT and filter 1 are used for the up 1490nm of filtering out wave band optical signal, and the light signal of descending 1490nm wave band is transformed on the 1310nm wave band carries; Wavelength conversion between optical coupler and the GPON OLT and filter 2 are used for the up 1310nm of filtering out wave band optical signal, and the light signal of up 1490nm wave band is transformed on the 1310nm wave band carries.Like this, among the shared ODN between each wavelength conversion and filter, the 1310nm wave band is used in the up-downgoing of BPON system, the 1490nm wave band is used in GPON system up-downgoing, and the wave band of still using standard code originally separately between OLT, ONT and wavelength conversion that cooperates separately and filter carries the up-downgoing data.
Wavelength conversion that matches with ONT and filter provide the CATV business of wavelength stacked system for descending by the 1550nm wave band, do not need wavelength Conversion to handle, as long as can make that the 1550nm band signal is transparent and pass.
In addition, as an improvement of the present invention, consider that the OLT side adds caused decay behind the optical coupler, wavelength conversion and filter can have certain amplification.
Embodiment two:
As shown in Figure 2, present embodiment is compared with embodiment one, difference is that the wavelength conversion of ONT one side among the embodiment one and filter are arranged under the afterbody optical splitter of sharing among the ODN, and the wavelength conversion of ONT one side and filter are arranged under a certain level optical splitter of sharing among the ODN in the present embodiment, as long as the ONT that this wavelength conversion and filter are hung down is same technology standard, and this wavelength conversion and filter match with this technology standard.That is: also comprise at least one optical splitter between the ONT of long conversion of single ONT side wave and filter and a plurality of identical standard optical access networks.
Embodiment three:
As shown in Figure 3, a kind of EPON mainly comprises BPON OLT (optical line terminal), BPON ONT (Optical Network Terminal), GPON OLT, GPON ONT, optical splitter, Optical Code Division Multiplexing (OCDMA) codec and optical coupler in the present embodiment.As seen from the figure, the EPON of BPON and two kinds of technology standards of GPON is shared the optical distribution (ODN) that comprises optical splitter and feeder line section.We define the direction of behavior ONT to OLT, and following behavior OLT is to the direction of ONT.Then BPON OLT links to each other with at least one optical coupler with OCDMA codec G0 by OCDMA codec B0 respectively with GPON OLT.Optical coupler links to each other with next stage optical splitter among the shared ODN, and it is coupled to the light signal from above-mentioned two technology standards, sends into to share among the ODN to carry.In ONT one side, each BPON ONT and each GPON ONT link to each other with afterbody optical splitter among the shared ODN by OCDMA codec B1 and OCDMA codec G1 respectively.
Wherein, the OCDMA codec B0 between optical coupler and the BPON OLT is used for up 1310nm wave band optical signal is decoded with OCDMA code word U1, and descending 1490nm band signal is encoded with OCDMA code word D1; OCDMA codec G0 between optical coupler and the GPON OLT is used for up 1310nm band signal is decoded with OCDMA code word U2, and descending 1490nm band signal is encoded with OCDMA code word D2; OCDMA codec B1 between BPON ONT light mouth and the shared ODN is used for up 1310nm band signal is encoded with OCDMA code word U1, and descending 1490nm band signal is decoded with OCDMA code word D1; OCDMA codec G1 between GPON ONT light mouth and the shared ODN is used for up 1310nm band signal is encoded with OCDMA code word U2, and descending 1490nm band signal is decoded with OCDMA code word D2.Like this, among the shared ODN between each OCDMA codec, BPON, the transmission behind the OCDMA coding of GPON system uplink and downlink signals, the code word that same direction different systems system uses is quadrature (U1 and a U2 quadrature, D1 and D2 quadrature), thereby the mode with OCDMA has been avoided conflict, and still uses the wave band carrying up-downgoing data of original standard code separately between OLT, ONT and the OCDMA codec that cooperates separately.
Relevant OCDMA codec provides the CATV business of wavelength stacked system for descending by the 1550nm wave band, do not need to handle, as long as can make that the 1550nm band signal is transparent and pass.
In addition, as an improvement of the present invention, consider that the OLT side adds caused decay behind the optical coupler, the OCDMA codec can have certain amplification.
Embodiment four:
As shown in Figure 4, present embodiment is compared with embodiment three, difference is that the OCDMA codec of ONT one side among the embodiment three is arranged under the afterbody optical splitter of sharing among the ODN, and the OCDMA codec of ONT one side is arranged under a certain level optical splitter of sharing among the ODN in the present embodiment, as long as the ONT that this OCDMA codec is hung down is same technology standard, and this OCDMA codec matches with this technology standard.That is: also comprise at least one optical splitter between the ONT of single ONT sidelight code division multiplexing codec and a plurality of identical standard optical access networks.
The foregoing description is that the EPON with BPON and these two kinds of different technologies standards of GPON is that example is set forth the present invention, but the present invention is not limited to above-mentioned two kinds of technology standards, and the EPON of any technology standard all is suitable for the present invention.
Claims (12)
1, multiple optical access network is shared the EPON of optical fiber distributing network, comprise by sharing the optical line terminal OLT and the Optical Network Terminal ONT of the continuous different systems optical access network of optical fiber distributing network ODN, it is characterized in that: also comprise being connected between OLT and the shared ODN, long conversion of the OLT side wave of OLT and filter in the corresponding different systems optical access network of difference, and be connected between ONT and the shared ODN, long conversion of the ONT side wave of ONT and filter in the corresponding different systems optical access network of difference, be used for the signal of the shared ODN of I/O is filtered and changes, use different wave length to transmit the same direction of signal in sharing ODN of different systems optical access network.
2, EPON according to claim 1 is characterized in that: also comprise at least one optical coupler, be connected and share between ODN and long conversion of OLT side wave and the filter.
3, EPON according to claim 1 and 2 is characterized in that: also comprise at least one optical splitter, be connected between long conversion of described optical coupler and ONT side wave and the filter.
4, EPON according to claim 3 is characterized in that: also comprise at least one optical splitter, be connected between the ONT of long conversion of single ONT side wave and filter and a plurality of identical standard optical access networks.
5, a kind of method of sharing optical fiber distributing network based on the multiple optical access network of the described EPON of claim 1, it is characterized in that: corresponding wavelength conversion and filter are changed importing the signal of sharing ODN, use different wave length to transmit the same direction of signal in sharing ODN of different systems optical access network; Filter and change exporting the signal of sharing ODN simultaneously, corresponding light signal is input among corresponding technology standard OLT or the ONT.
6, method according to claim 5 is characterized in that further comprising: in the OLT side, optical coupler is coupled to the signal between the long conversion of OLT side wave and filter and the next stage optical splitter.
7, multiple optical access network is shared the EPON of optical fiber distributing network, comprise by sharing the optical line terminal OLT and the Optical Network Terminal ONT of the continuous different systems optical access network of optical fiber distributing network ODN, it is characterized in that: also comprise being connected between OLT and the shared ODN, the OLT sidelight code division multiplexing codec of OLT in the corresponding different systems optical access network of difference, and be connected between ONT and the shared ODN, the ONT sidelight code division multiplexing codec of ONT in the corresponding different systems optical access network of difference, be used for the signal of the shared ODN of I/O is encoded or decoded, use the different code words of quadrature to carry out coding transmission the same direction of signal in sharing ODN of different systems optical access network.
8, EPON according to claim 7 is characterized in that: also comprise at least one optical coupler, be connected and share between ODN and the OLT sidelight code division multiplexing codec.
9, according to claim 7 or 8 described EPONs, it is characterized in that: also comprise at least one optical splitter, be connected between described optical coupler and the ONT sidelight code division multiplexing codec.
10, EPON according to claim 9 is characterized in that: also comprise at least one optical splitter, be connected between the ONT of single ONT sidelight code division multiplexing codec and a plurality of identical standard optical access networks.
11, a kind of method of sharing optical fiber distributing network based on the multiple optical access network of right 7 described EPONs, it is characterized in that: corresponding Optical Code Division Multiplexing codec carries out coding/decoding to importing the signal of sharing ODN, uses the different code words of quadrature to carry out coding transmission the same direction of signal in sharing ODN of different systems optical access network; Carry out decoding/encoding to exporting the signal of sharing ODN simultaneously, corresponding light signal is input among corresponding technology standard OLT or the ONT.
12, method according to claim 11 is characterized in that further comprising: in the OLT side, optical coupler is coupled to the signal between OLT sidelight code division multiplexing codec and the next stage optical splitter.
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