CN101098206B - Passive optical network system and light path processing method - Google Patents
Passive optical network system and light path processing method Download PDFInfo
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Abstract
The invention discloses an inactive optical network system and a relative optical path processing method, wherein in descending data process, the invention uses filter and optical path connector to combine the output paths of central devices of TDM-PON and WDM-PON, via beam divider and filter unit to be divided and/or filtered to be sent to a TDM-PON user terminal and a splitting/combining device, and in ascending data process, the invention uses the beam divider and filter unit to combine the output optical paths of the TDM-PON user terminal and the splitting/combining device, and via a filter and optical path connector, the combined optical path is divided and/or filtered to be sent to the central devices of TDM-PON and WDM-PON. The invention realizes the coexistence of TDM-PON system and WDM-PON system, to avoid resource waste caused by upgrading TDM-PON user terminal to WDM-PON user terminal.
Description
Technical field
The present invention relates to passive optical network technique, particularly a kind of passive optical network and light path processing method thereof.
Background technology
In the present communication service, the development that video traffic, particularly Web TV (IPTV) are professional makes the communication flows sharp increase, and this has just proposed higher demand to bandwidth.What communication service data transmission was at present mainly adopted is digital subscriber line (XDSL) technology, but the XDSL technology can not satisfy the demand of high definition TV (HDTV) to bandwidth.
In order to satisfy communication service to the increasingly high demand of bandwidth, in communication network, adopted EPON (PON) as Access Network,
Existing EPON is divided into time division multiplexing EPON (TDM-PON) and Wave division multiplexing passive optical network (WDM-PON), two kinds of EPONs comparatively speaking, WDM-PON can provide higher bandwidth and better security performance.
Existing TDM-PON comprises: based on the EPON (APON) of asynchronous transmission technology, based on Ethernet EPON (EPON), BPON (BPON) and based on the EPON (GPON) of gigabit speed etc.Referring to Fig. 1, Fig. 1 is the structural representation of the TDM-PON system of prior art.As shown in Figure 1, the TDM-PON system comprises: center-side equipment (OLT) 101, fiber distribution network (ODN) 102 and optic network user terminal (ONU/ONT) 103.Wherein, OLT is used for the transmitting-receiving of light; ODN comprises Transmission Fibers and optical branching device, and optical branching device is issued optic network user terminal after being used for the light that OLT receives is divided into several bundles; Optical branching device is used for also the multichannel light that optic network user terminal sends pooled that riches all the way gives OLT.
Referring to Fig. 2, Fig. 2 is the up-downgoing transfer of data sketch map of TDM-PON system.In the TDM-PON system; OLT sends to each optic network user terminal through Time Division Multiplexing with downlink data; Optic network user terminal is selected in the data flow that receives and is taken out one's own data segment, abandons other data segments, shown in Fig. 2 (a).Optic network user terminal then adopts the mode of burst transmissions, takies one or several time slots, and order sends to OLT with upstream data, shown in Fig. 2 (b).
All optic network user terminals of time division multiplexing-EPON (TDM-PON) are shared upstream and downstream bandwidth, so these networks have some shortcomings clearly: the raw tape of optic network user terminal is wide not high, and security performance is relatively poor.
Wavelength division multiplexing-EPON (WDM-PON) is the network of the economic performance of a kind of broadband character that has combined dense wave division multipurpose (DWDM) system and EPON.WDM-PON adopts the structure of most economical point-to-multipoint on physical structure, and on communication mode, distributes one or two wavelength through giving each user, has realized point-to-point communication.Each network user terminals is enjoyed one or two wavelength separately, and bandwidth can be guaranteed, and security performance is good.
Referring to Fig. 3, Fig. 3 is the structural representation of WDM-PON system in the prior art.As shown in Figure 3, the WDM-PON system comprises: center-side equipment (OLT), far-end Optical Distribution Network, optic network user terminal (ONU/ONT).Wherein, OLT comprises optical transceiver 301 and closes ripple/channel-splitting filter 302; The fiber distribution network comprises Transmission Fibers and wave splitting/composing device (WDM) 303.
Along with the raising of business to bandwidth demand, TDM-PON will inevitably be to WDM-PON transition and upgrading.Use WDM-PON if abandon the TDM-PON that has laid fully, can cause the significant wastage of resource.
In addition; In the prior art; Closing between ripple/channel-splitting filter and the optic network user terminal of fiber distribution network through in the WDM-PON system increases optical splitter, and makes each optical splitter connect a plurality of optic network user terminals, realized the time division multiplexing in the WDM-PON system.Referring to Fig. 4, Fig. 4 is that prior art realizes time-multiplexed system configuration sketch map in the WDM-PON system.
As shown in Figure 4, this WDM-PON system comprises: optical transceiver 401 and center-side equipment, wave splitting/composing device 403, a plurality of optical branching device 404 of wave splitting/composing device 402 compositions and a plurality of optic network user terminals 405 that link to each other with each optical branching device 404.
In this system optic network user terminal 405 all be the WDM-PON user terminal; Promptly all only corresponding fixing wavelength; This system has realized the time division multiplexing of the corresponding fixed wave length of a plurality of optic network user terminals through a plurality of optic network user terminals 405 are connected on the optical branching device 404.But the time division multiplexing in this time division multiplexing and the existing TDM-PON system is not just the same; What all optic network user terminals of existing TDM-PON system were corresponding is a wave-length coverage; Rather than a fixing wavelength value, the therefore inreal coexistence that realizes existing TDM-PON and WDM-PON system of this method.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of passive optical network, and TDM-PON system and WDM-PON system can be coexisted, and the optic network user terminal of TDM-PON system can upgrade to the optic network user terminal of WDM-PON system easily.
In view of this; Another main purpose of the present invention is to provide a kind of light path processing method of passive optical network; TDM-PON system and WDM-PON system can be coexisted, and the optic network user terminal of TDM-PON system can upgrade to the optic network user terminal of WDM-PON system easily.
In order to realize above-mentioned goal of the invention; The invention provides a kind of passive optical network; This system comprises: time division multiplexing EPON center-side equipment, Wave division multiplexing passive optical network center-side equipment, filtering and light path linkage unit, light shunt and filter unit, wave splitting/composing device and at least one TDM optical network user terminal and at least one wavelength division multiplexed optical network user terminal; Said filtering and light path linkage unit are used for sending to said light shunt and filter unit after the light path merging with time division multiplexing EPON center-side equipment and the input of Wave division multiplexing passive optical network center-side equipment; Light is sent to time division multiplexing EPON center-side equipment and Wave division multiplexing passive optical network center-side equipment respectively along separate routes and after the light path process filtering of filter unit input; Perhaps; The light path of light shunt and filter unit input is sent to time division multiplexing EPON center-side equipment after the filtering again through shunt earlier; After the light path shunt with light shunt and filter unit input, send to Wave division multiplexing passive optical network center-side equipment; Said light shunt and filter unit are used for the light path of filtering and the input of light path linkage unit is sent to said at least one TDM optical network user terminal after the filtering earlier along separate routes again; Send to the wave splitting/composing device after the light path shunt with filtering and the input of light path linkage unit; Perhaps the light path elder generation filtering with filtering and the input of light path linkage unit sends to said at least one TDM optical network user terminal after the shunt again, sends to the wave splitting/composing device after the light path filtering with filtering and the input of light path linkage unit; And, also be used for sending to said filtering and light path linkage unit after the light path merging with said at least one TDM optical network user terminal and the input of wave splitting/composing device; Said wave splitting/composing device; Be connected between light shunt and filter unit and said at least one wavelength division multiplexed optical network user terminal; Be used for light is sent to each wavelength division multiplexed optical network user terminal along separate routes and behind the light path demultiplexing of filter unit input, and the light path of wavelength division multiplexed optical network user terminal input sent to light after multiplexing along separate routes and filter unit.
Said filtering and light path linkage unit are made up of filter and light path linkage unit, and said filter sends to time division multiplexing EPON center-side equipment after being used for the light path of light path linkage unit input carried out filtering; Said light path linkage unit is further used for sending to said light shunt and filter unit after the light path merging with time division multiplexing EPON center-side equipment and the input of Wave division multiplexing passive optical network center-side equipment; And after the light path shunt with light shunt and filter unit input, send to Wave division multiplexing passive optical network center-side equipment and said filter.
Said light path linkage unit is the optical device with light path linkage function, and said optical device comprises optical coupler and optical branching device.Said filtering and light path linkage unit are the specific filter unit; It has a Hybrid port and two branch ports; After the light path that this specific filter unit is imported two branch ports through Hybrid port merges; Send to light shunt and filter unit, and the light path of light shunt and filter unit input is sent to two branch ports; Two branch ports link to each other with time division multiplexing EPON center-side equipment with Wave division multiplexing passive optical network center-side equipment respectively; After being used for light path filtering with the center-side equipment input that links to each other; Send to Hybrid port; And after the light path filtering with the Hybrid port input, send to continuous center-side equipment.Said light shunt and filter unit are made up of a specific filter unit and an optical branching device of linking to each other; Said specific filter unit has a Hybrid port and two branch ports; After the light path that this specific filter unit is imported two branch ports through Hybrid port merges; Send to filtering and light path linkage unit, and the light path of filtering and the input of light path linkage unit is sent to two branch ports; Two branch ports link to each other with the wave splitting/composing device with optical branching device respectively, after the light path filtering that is used for the optical device that links to each other is imported, send to Hybrid port, and after the light path filtering with the Hybrid port input, send to continuous optical device.
Said optical branching device further links to each other with said at least one TDM optical network user terminal; Be used for sending to each continuous TDM optical network user terminal after the light path shunt with the input of specific filter unit; And after the light path merging of each TDM optical network user terminal input that will link to each other, send to the specific filter unit.
Said light shunt and filter unit are made up of with at least one filter an optical branching device that links to each other; Said optical branching device further links to each other with said wave splitting/composing device with said filtering and light path linkage unit; After being used for light path shunt, send to continuous wave splitting/composing device and said at least one filter with said filtering and the input of light path linkage unit; Said at least one filter links to each other with said TDM optical network user terminal respectively, after the light path filtering that is used for optical branching device is imported, sends to continuous TDM optical network user terminal.Said at least one filter is arranged on said optical branching device one side, links to each other with said TDM optical network user terminal through optical fiber; Perhaps, said at least one filter is arranged on said TDM optical network user terminal one side, links to each other with said optical branching device through optical fiber.This system further comprises at least one image intensifer, and said image intensifer is arranged on the optional position in the network between time division multiplexing EPON center-side equipment or Wave division multiplexing passive optical network center-side equipment and the TDM optical network user terminal.Said Wave division multiplexing passive optical network center-side equipment comprises continuous optical transceiver and wave splitting/composing device.
Said Wave division multiplexing passive optical network center-side equipment further comprises optical coupler and wide spectrum light source, and said wide spectrum light source links to each other with optical coupler; Said optical coupler further comprises two links, and an end links to each other with wave splitting/composing device in the said Wave division multiplexing passive optical network center-side equipment; The other end links to each other with said filtering and light path linkage unit.
A kind of light path processing method of passive optical network; This method comprises downlink data processing procedure and upstream data processing procedure, and said downlink data processing procedure comprises: the light path of A1, merging time division multiplexing EPON center-side equipment and the output of Wave division multiplexing passive optical network center-side equipment; B1, the light path after will merging send to the wave splitting/composing device that is connected with the wavelength division multiplexed optical network user terminal with the light path after merging through sending to the TDM optical network user terminal after the filtering more along separate routes earlier after along separate routes; Perhaps, the light path after merging is sent to the TDM optical network user terminal after the shunt again through first filtering, the light path after merging is sent to the wave splitting/composing device that is connected with the wavelength division multiplexed optical network user terminal through after the filtering; Said upstream data processing procedure comprises: the light path that A2, merging TDM optical network user terminal and the wave splitting/composing device that links to each other with the wavelength division multiplexed optical network user terminal are exported; B2, the light path after will merging send to Wave division multiplexing passive optical network center-side equipment with the light path after merging through sending to time division multiplexing EPON center-side equipment after the filtering more along separate routes earlier after along separate routes; Light path after perhaps will merging sends to time division multiplexing EPON center-side equipment and Wave division multiplexing passive optical network center-side equipment respectively through after the filtering.
Passive optical network provided by the invention and light path processing method thereof; In the downlink data processing procedure; The output light path of center-side equipment that merges center-side equipment and the WDM-PON of TDM-PON through filtering and light path linkage unit, again through light along separate routes and filter unit the light path that merges is sent to TDM-PON user terminal and the wave splitting/composing device that links to each other with the WDM-PON user terminal after shunt and/or filtering.In the upstream data processing procedure; Output light path through light shunt and filter unit merging TDM-PON user terminal and the wave splitting/composing device that links to each other with the WDM-PON user terminal sends to the center-side equipment of TDM-PON and the center-side equipment of WDM-PON with the light path that merges through filtering and light path linkage unit again after shunt and/or filtering.
Utilize passive optical network of the present invention and light path processing method thereof, realized the coexistence of TDM-PON system of the prior art and WDM-PON system, avoided the TDM-PON user terminal is upgraded to the wasting of resources that the WDM-PON user terminal possibly cause.
Passive optical network of the present invention has multiple embodiments, promptly can pass through existing filter, optical coupler, optical branching device realization, also can realize through specific filter provided by the invention unit.
In addition; Passive optical network of the present invention can be selected for the terminal use provides flexibly; The TDM-PON terminal use can select whether to upgrade to the WDM-PON terminal use as required; If the terminal use that need not upgrade can use original TDM-PON system, and each user's upgrading can not interrupted other users' business.
Description of drawings
Fig. 1 is the structural representation of the TDM-PON system of prior art;
Fig. 2 is the up-downgoing transfer of data sketch map of TDM-PON system;
Fig. 3 is the structural representation of the WDM-PON system of prior art;
Fig. 4 is that prior art realizes time-multiplexed system configuration sketch map in the WDM-PON system;
Fig. 5 is the structural representation of passive optical network of the present invention;
Fig. 6 is the structural representation of a preferred embodiment of system shown in Figure 5;
Fig. 7 is the structural representation of second preferred embodiment of system shown in Figure 5;
Fig. 8 is the structural representation of the 3rd preferred embodiment of system shown in Figure 5;
Fig. 9 is the structural representation of the 4th preferred embodiment of system shown in Figure 5;
Figure 10 is the structural representation of the 5th preferred embodiment of system shown in Figure 5;
Figure 11 is the flow chart of the light path processing method of passive optical network of the present invention.
Embodiment
For making the object of the invention, technical scheme and beneficial effect clearer, below in conjunction with embodiment and accompanying drawing, to further explain of the present invention.
Passive optical network provided by the invention and light path processing method thereof; In the downlink data processing procedure; The output light path of center-side equipment that merges center-side equipment and the WDM-PON of TDM-PON through filtering and light path linkage unit, again through light along separate routes and filter unit the light path that merges is sent to TDM-PON user terminal and the wave splitting/composing device that links to each other with the WDM-PON user terminal after shunt and/or filtering.In the upstream data processing procedure; Output light path through light shunt and filter unit merging TDM-PON user terminal and the wave splitting/composing device that links to each other with the WDM-PON user terminal sends to the center-side equipment of TDM-PON and the center-side equipment of WDM-PON with the light path that merges through filtering and light path linkage unit again after shunt and/or filtering.
Referring to Fig. 5, Fig. 5 is the structural representation of passive optical network of the present invention.As shown in Figure 5, this system comprises: center-side equipment, far-end Optical Distribution Network and optic network user terminal.
Wherein, center-side equipment comprises: TDM-PON center-side equipment 501, WDM-PON center-side equipment 502, filtering and light path linkage unit 503; The far-end Optical Distribution Network comprises: light shunt and filter unit 504, wave splitting/composing device 505; Optic network user terminal comprises: at least one TDM-PON user terminal 506 and at least one WDM-PON user terminal 507.
Described filtering and light path linkage unit 503 have three links; One end links to each other with described TDM-PON center-side equipment 501; One end links to each other with described WDM-PON center-side equipment 502, and an end links to each other with described light shunt and filter unit 504 through optical fiber.
Filtering and light path linkage unit 503 are used for sending to described light shunt and filter unit 504 after the light path merging with TDM-PON center- side equipment 501 and 502 inputs of WDM-PON center-side equipment; Also be used for the light path of light shunt and filter unit 504 inputs is sent to TDM-PON center-side equipment 501 after the filtering again through filtering or shunt earlier, process sends to WDM-PON center-side equipment 502 along separate routes or after the filtering;
Described light shunt and filter unit 504 have at least three links; One end links to each other with described filtering and light path linkage unit 503 through optical fiber; One end links to each other with described wave splitting/composing device 505, and remaining link links to each other with described one or more TDM-PON user terminals 506.
Light shunt and filter unit 504; Be used for the light path of filtering and 503 inputs of light path linkage unit is sent to wave splitting/composing device 505 through filtering or along separate routes; Send to TDM-PON user terminal 506 after process filtering and the shunt, and send to described filtering and light path linkage unit 503 after the light path merging with TDM- PON user terminal 506 and 505 inputs of wave splitting/composing device.
Here; After why will the light path of filtering and 503 inputs of light path linkage unit being passed through filtering; Sending to TDM-PON user terminal 506, is because the block filter that TDM-PON user terminal 506 carries can not accurately be distinguished the wavelength outside the TDM-PON system wavelength; And the light path of filtering and 503 inputs of light path linkage unit not only comprises the TDM-PON system wavelength, also comprises the WDM-PON system wavelength.Therefore, only comprise the TDM-PON system wavelength, must redispatch to TDM-PON user terminal 506 with the light path of filtering and light path linkage unit 503 inputs through after the filtering in order to guarantee the light path that sends to TDM-PON user terminal 506.
Usually, TDM-PON system wavelength scope comprises: up-downgoing data wavelength and cable TV (CATV) wavelength.The downlink data wave-length coverage that TDM-PON center-side equipment 501 sends is 1480～1500nm; The CATV wave-length coverage is 1540～1560nm; And the filter range of the corresponding downlink data wavelength of block filter of TDM-PON user terminal 506 inside is: 1430～1541nm; The filter range of corresponding CATV is: 1535～1577nm far exceeds the downlink data of TDM-PON center-side equipment transmission and the wave-length coverage of CATV.
The wave-length coverage of the upstream data that TDM-PON user terminal 506 sends is 1260～1360nm; And the filter range of the block filter of TDM-PON user terminal 506 inside is 1260～1428nm, far exceeds the wave-length coverage of the upstream data of TDM-PON user terminal 506 transmissions.
Can know from the filter range and the comparison of TDM-PON system wavelength scope of above-mentioned block filter; The filter range of block filter is much larger than TDM-PON system wavelength scope; If the filter range of WDM-PON system wavelength and block filter has common factor; Then this part light path also can be sent to TDM-PON user terminal 506, therefore, and in order accurately to distinguish the wavelength outside the TDM-PON system wavelength; After the light path of filtering and 503 inputs of light path linkage unit need be passed through filtering, just can send to TDM-PON user terminal 506.
Above-mentioned WDM-PON center-side equipment 502 comprises continuous optical transceiver and wave splitting/composing device at least; If adopt the center-side equipment of pouring-in Wave division multiplexing passive optical network; Then the optical transceiver in the WDM-PON center-side equipment 502 is pouring-in optical transceiver; WDM-PON center-side equipment 502 also need further comprise: optical coupler and wide spectrum light source, wide spectrum light source links to each other with optical coupler, is used to pouring-in optical transceiver light source is provided.In WDM-PON center-side equipment 502, wide spectrum light source is set, can guarantees to be between center-side equipment and the user terminal EPON.
The passive optical network that above-mentioned time division multiplexing and wavelength division multiplexing mix can further include at least one image intensifer, is used to amplify the light signal of output and input.
Described image intensifer can be arranged on the optional position in the network between TDM-PON center-side equipment 501 or WDM-PON center-side equipment 502 and the optic network user terminal.
Such as: image intensifer is arranged between TDM-PON center-side equipment 501 and described filtering and the light path linkage unit 503, is used to amplify the light signal of TDM-PON center-side equipment 501 input and output; Also can be arranged between WDM-PON center-side equipment 502 and described filtering and the light path linkage unit 503, be used to amplify the light signal of input and output WDM-PON center-side equipment 502; Can also be arranged on after described filtering and the light path linkage unit 503, link to each other with described light shunt and filter unit 504, be used for amplifying simultaneously the light signal of TDM-PON center- side equipment 501 and 502 input and output of WDM-PON center-side equipment through optical fiber.
In practical application, can select the different positions that is provided with, one or more image intensifers are set in system.
Referring to Fig. 6, Fig. 6 is the structural representation of a preferred embodiment of system shown in Figure 5.TDM-PON center-side equipment 601, filtering and light path linkage unit 607 among this embodiment, light along separate routes and filter unit 608, wave splitting/composing device 609 and optic network user terminal 610 and 611 respectively with Fig. 5 in TDM-PON center-side equipment 501, filtering and light path linkage unit 503, light along separate routes and filter unit 504, wave splitting/composing device 505 and optic network user terminal 506 and 507 corresponding.
In system shown in Figure 6; WDM-PON center-side equipment has adopted the center-side equipment of pouring-in Wave division multiplexing passive optical network, and it comprises: optical transceiver 602, wave splitting/composing device 603, optical coupler 604 and the wide spectrum light source 605 that links to each other with optical coupler 604.More than the combination of four optical devices corresponding with WDM-PON center-side equipment 502 among Fig. 5.
Simultaneously, in system shown in Figure 6, also be provided with an image intensifer 606, this image intensifer 606 is arranged between the optical coupler 604 and described filtering and light path linkage unit 607 of WDM-PON center-side equipment.
Filtering in the system shown in Figure 5 and light path linkage unit 503 can realize that described light path linkage unit can be optical coupler or optical branching device through existing filter and light path linkage unit; Filtering and light path linkage unit 503 can also be realized by specific filter provided by the invention unit.
This specific filter that the present invention proposes possesses a Hybrid port and two branch ports, wherein, and the filtering characteristic that the branch port that links to each other with WDM-PON center-side equipment 505 has all WDM-PON wave-length coverages; The branch port that links to each other with TDM-PON center-side equipment 504 has the G.983PON filtering characteristic of standard wave length's scope; And Hybrid port is used for minute light path of port input is merged back output, and the light path of other optical device input is sent to two branch ports.
Light in the system shown in Figure 5 along separate routes and filter unit 504 can pass through optical branching device and a plurality of existing filter is realized; Also can realize through aforesaid specific filter provided by the invention unit.
Referring to Fig. 7, Fig. 7 is the structural representation of second preferred embodiment of system shown in Figure 5.Like Fig. 7 (a) with (b), the TDM-PON center-side equipment 701 among this embodiment is corresponding with TDM-PON center-side equipment 501 among Fig. 5; Optic network user terminal 506 and 507 among optic network user terminal 709 and 710 difference correspondences and Fig. 5.
Described filter 704 links to each other with light path linkage unit 705 with TDM-PON center-side equipment 701 respectively, after being used for the light path of light path linkage unit 705 input carried out filtering, sends to TDM-PON center-side equipment 701.
Described light path linkage unit 705 further links to each other with described optical branching device 706 with described wave splitting/composing device 703; It is used for sending to described optical branching device 706 after the light path merging with TDM-PON center- side equipment 701 and 703 inputs of wave splitting/composing device; And after the light path shunt with optical branching device 706 inputs, send to wave splitting/composing device 703 and described filter 704.
Described light path linkage unit 705 can be optical coupler, or optical branching device, or other have the optical device of light path linkage function.
Described optical branching device 706 links to each other with a plurality of filters 708; Also link to each other with described wave splitting/composing device 707 simultaneously with described light path linkage unit 705; After being used for light path shunt, send to continuous wave splitting/composing device 707 and a plurality of filters 708 with said light path linkage unit 705 inputs;
Described a plurality of filter 708 links to each other with described a plurality of TDM-PON user terminals 709 respectively, after the light path filtering that is used for optical branching device 706 is imported, sends to continuous TDM-PON user terminal 709.
Described a plurality of filter 708 can be arranged on the front of described a plurality of TDM-PON user terminals 709, links to each other with described optical branching device 706 through optical fiber, shown in Fig. 7 (a); Also can be arranged on the back of described optical branching device 706, link to each other with described a plurality of TDM-PON user terminals 709 through optical fiber, shown in Fig. 7 (b).
Referring to Fig. 8, Fig. 8 is the structural representation of the 3rd preferred embodiment of system shown in Figure 5.As shown in Figure 8, the TDM-PON center-side equipment 801 among this embodiment is corresponding with TDM-PON center-side equipment 501 among Fig. 5; Optic network user terminal 506 and 507 among optic network user terminal 808 and 809 difference correspondences and Fig. 5.
Described specific filter unit 804 has a Hybrid port and two branch ports; Wherein, Hybrid port links to each other with described certain filtering unit 805 through optical fiber; It sends to certain filtering unit 805 through optical fiber after being used for the light path merging with two branch port inputs, and the light path of certain filtering unit 805 inputs is sent to two branch ports.
Two branch ports link to each other with TDM-PON center-side equipment 801 with the wave splitting/composing device 803 of WDM-PON center-side equipment respectively; After being used for light path filtering with TDM-PON center-side equipment that links to each other 801 and 803 inputs of wave splitting/composing device; Send to Hybrid port; And after the light path filtering with the Hybrid port input, send to continuous TDM-PON center-side equipment 801 and wave splitting/composing device 803.
Two branch ports have the different filtering characteristic, the filtering characteristic that the branch port that links to each other with wave splitting/composing device 803 has all WDM-PON wave-length coverages; The branch port that links to each other with TDM-PON center-side equipment 801 has the G.983PON filtering characteristic of standard wave length's scope.
Described specific filter unit 805 has identical structure with specific filter unit 804; It also has a Hybrid port and two branch ports; Its Hybrid port links to each other with described specific filter unit 804 through optical fiber; After being used for light path merging, sending to specific filter unit 804 through optical fiber, and the light path of specific filter unit 804 inputs is sent to two branch ports two branch port inputs.
Two branch ports link to each other with wave splitting/composing device 807 with optical branching device 806 respectively; After being used for light path filtering with optical branching device that links to each other 806 and 807 inputs of wave splitting/composing device; Send to Hybrid port; And after the light path filtering with the Hybrid port input, send to continuous optical branching device 806 and wave splitting/composing device 807.
The filtering characteristic that the branch port that links to each other with wave splitting/composing device 807 has all WDM-PON wave-length coverages; The branch port that links to each other with optical branching device 806 has the G.983PON filtering characteristic of standard wave length's scope.
Described optical branching device 806 links to each other with described a plurality of TDM-PON user terminals 808; Be used for sending to each continuous TDM-PON user terminal 808 after the light path shunt with 805 inputs of specific filter unit; And after the light path merging of each TDM-PON user terminal 808 input that will link to each other, send to specific filter unit 805.
Except Fig. 7 and embodiment shown in Figure 8, can also there be following embodiment in system shown in Figure 5:
Its filtering and light path linkage unit 503 adopt structure shown in Figure 7, and light shunt and filter unit 504 adopt structure shown in Figure 8, and be as shown in Figure 9; Perhaps its filtering and light path linkage unit 503 adopt structure shown in Figure 8, and light shunt and filter unit 504 adopt structure shown in Figure 7, like Figure 10 (a) with (b).
Fig. 7 is made up of optical transceiver and wave splitting/composing device to the WDM-PON center-side equipment among the embodiment shown in Figure 10; This WDM-PON center-side equipment also may further include optical coupler and wide spectrum light source; Constitute pouring-in WDM-PON center-side equipment, structure as shown in Figure 6.
Fig. 7 is in embodiment shown in Figure 10, and further the optional position in the network between TDM-PON center-side equipment or WDM-PON center-side equipment and optic network user terminal is provided with one or more image intensifers.
Referring to Figure 11, Figure 11 is the flow chart of the light path processing method of passive optical network of the present invention.Figure 11 (a) is the flow chart of downlink data light path processing method in the passive optical network of the present invention.This flow process comprises the steps:
Step 1101 merges the light path that time division multiplexing EPON center-side equipment and Wave division multiplexing passive optical network center-side equipment are exported;
Step 1102 sends to the wave splitting/composing device that the TDM optical network user terminal is connected with the wavelength division multiplexed optical network user terminal along separate routes and/or after the filtering with the light path process after merging.
Wherein, step 1102 can be: light path after will merging earlier along separate routes again after the filtering, sends to the TDM optical network user terminal; After the light path shunt after merging, send to the wave splitting/composing device that the wavelength division multiplexed optical network user terminal connects.
Also can for: light path after will merging elder generation filtering more along separate routes after, send to the TDM optical network user terminal respectively; After the light path filtering after merging, send to the wave splitting/composing device that the wavelength division multiplexed optical network user terminal connects.
Figure 11 (b) is the flow chart of upstream data light path processing method in the passive optical network of the present invention.This flow process comprises the steps:
Step 1103, the light path that merging TDM optical network user terminal and the wave splitting/composing device that links to each other with the wavelength division multiplexed optical network user terminal are exported;
Step 1104 sends to time division multiplexing EPON center-side equipment and Wave division multiplexing passive optical network center-side equipment along separate routes and/or after the filtering with the light path process after merging.
Wherein, step 1104 can be: light path after will merging earlier along separate routes again after the filtering, sends to time division multiplexing EPON center-side equipment; After the light path shunt after merging, send to Wave division multiplexing passive optical network center-side equipment.
Also can for: after the light path filtering after will merging, send to time division multiplexing EPON center-side equipment and Wave division multiplexing passive optical network center-side equipment respectively.
In a word, the above is merely preferred embodiment of the present invention, is not to be used to limit protection scope of the present invention.All within spirit of the present invention and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (11)
1. passive optical network; It is characterized in that; This system comprises: time division multiplexing EPON center-side equipment, Wave division multiplexing passive optical network center-side equipment, filtering and light path linkage unit, light shunt and filter unit, wave splitting/composing device and at least one TDM optical network user terminal and at least one wavelength division multiplexed optical network user terminal
Said filtering and light path linkage unit are used for sending to said light shunt and filter unit after the light path merging with time division multiplexing EPON center-side equipment and the input of Wave division multiplexing passive optical network center-side equipment; Light is sent to time division multiplexing EPON center-side equipment and Wave division multiplexing passive optical network center-side equipment respectively along separate routes and after the light path process filtering of filter unit input; Perhaps; The light path of light shunt and filter unit input is sent to time division multiplexing EPON center-side equipment after the filtering again through shunt earlier; After the light path shunt with light shunt and filter unit input, send to Wave division multiplexing passive optical network center-side equipment;
Said light shunt and filter unit are used for the light path of filtering and the input of light path linkage unit is sent to said at least one TDM optical network user terminal after the filtering earlier along separate routes again; Send to the wave splitting/composing device after the light path shunt with filtering and the input of light path linkage unit; Perhaps the light path elder generation filtering with filtering and the input of light path linkage unit sends to said at least one TDM optical network user terminal after the shunt again, sends to the wave splitting/composing device after the light path filtering with filtering and the input of light path linkage unit; And, also be used for sending to said filtering and light path linkage unit after the light path merging with said at least one TDM optical network user terminal and the input of wave splitting/composing device;
Said wave splitting/composing device; Be connected between light shunt and filter unit and said at least one wavelength division multiplexed optical network user terminal; Be used for light is sent to each wavelength division multiplexed optical network user terminal along separate routes and behind the light path demultiplexing of filter unit input, and the light path of wavelength division multiplexed optical network user terminal input sent to light after multiplexing along separate routes and filter unit.
2. the system of claim 1; It is characterized in that; Said filtering and light path linkage unit are made up of filter and light path linkage unit, and said filter sends to time division multiplexing EPON center-side equipment after being used for the light path of light path linkage unit input carried out filtering;
Said light path linkage unit is further used for sending to said light shunt and filter unit after the light path merging with time division multiplexing EPON center-side equipment and the input of Wave division multiplexing passive optical network center-side equipment; And after the light path shunt with light shunt and filter unit input, send to Wave division multiplexing passive optical network center-side equipment and said filter.
3. system as claimed in claim 2 is characterized in that, said light path linkage unit is the optical device with light path linkage function, and said optical device comprises optical coupler and optical branching device.
4. the system of claim 1 is characterized in that, said filtering and light path linkage unit are the specific filter unit, and it has a Hybrid port and two branch ports,
After the light path that this specific filter unit is imported two branch ports through Hybrid port merges, send to light shunt and filter unit, and the light path of light shunt and filter unit input is sent to two branch ports;
Two branch ports link to each other with time division multiplexing EPON center-side equipment with Wave division multiplexing passive optical network center-side equipment respectively; After being used for light path filtering with the center-side equipment input that links to each other; Send to Hybrid port; And after the light path filtering with the Hybrid port input, send to continuous center-side equipment.
5. like claim 1,2 or 4 described systems, it is characterized in that said light shunt and filter unit are made up of a specific filter unit and an optical branching device of linking to each other,
Said specific filter unit has a Hybrid port and two branch ports; After the light path that this specific filter unit is imported two branch ports through Hybrid port merges; Send to filtering and light path linkage unit, and the light path of filtering and the input of light path linkage unit is sent to two branch ports;
Two branch ports link to each other with the wave splitting/composing device with optical branching device respectively, after the light path filtering that is used for the optical device that links to each other is imported, send to Hybrid port, and after the light path filtering with the Hybrid port input, send to continuous optical device.
Said optical branching device further links to each other with said at least one TDM optical network user terminal; Be used for sending to each continuous TDM optical network user terminal after the light path shunt with the input of specific filter unit; And after the light path merging of each TDM optical network user terminal input that will link to each other, send to the specific filter unit.
6. like claim 1,2 or 4 described systems, it is characterized in that said light shunt and filter unit are made up of with at least one filter an optical branching device that links to each other,
Said optical branching device further links to each other with said wave splitting/composing device with said filtering and light path linkage unit, be used for the light path of said filtering and light path linkage unit input along separate routes after, send to continuous wave splitting/composing device and said at least one filter;
Said at least one filter links to each other with said TDM optical network user terminal respectively, after the light path filtering that is used for optical branching device is imported, sends to continuous TDM optical network user terminal.
7. system as claimed in claim 6 is characterized in that, said at least one filter is arranged on said optical branching device one side, links to each other with said TDM optical network user terminal through optical fiber;
Perhaps, said at least one filter is arranged on said TDM optical network user terminal one side, links to each other with said optical branching device through optical fiber.
8. like claim 1,2 or 4 described systems; It is characterized in that; This system further comprises at least one image intensifer, and said image intensifer is arranged on the optional position in the network between time division multiplexing EPON center-side equipment or Wave division multiplexing passive optical network center-side equipment and the TDM optical network user terminal.
9. like claim 1,2 or 4 described systems, it is characterized in that said Wave division multiplexing passive optical network center-side equipment comprises continuous optical transceiver and wave splitting/composing device.
10. system as claimed in claim 9 is characterized in that, said Wave division multiplexing passive optical network center-side equipment further comprises optical coupler and wide spectrum light source, and said wide spectrum light source links to each other with optical coupler; Said optical coupler further comprises two links, and an end links to each other with wave splitting/composing device in the said Wave division multiplexing passive optical network center-side equipment; The other end links to each other with said filtering and light path linkage unit.
11. the light path processing method of a passive optical network is characterized in that, this method comprises downlink data processing procedure and upstream data processing procedure, and said downlink data processing procedure comprises:
The light path of A1, merging time division multiplexing EPON center-side equipment and the output of Wave division multiplexing passive optical network center-side equipment;
B1, the light path after will merging send to the wave splitting/composing device that is connected with the wavelength division multiplexed optical network user terminal with the light path after merging through sending to the TDM optical network user terminal after the filtering more along separate routes earlier after along separate routes; Perhaps, the light path after merging is sent to the TDM optical network user terminal after the shunt again through first filtering, the light path after merging is sent to the wave splitting/composing device that is connected with the wavelength division multiplexed optical network user terminal through after the filtering;
Said upstream data processing procedure comprises:
The light path that A2, merging TDM optical network user terminal and the wave splitting/composing device that links to each other with the wavelength division multiplexed optical network user terminal are exported;
B2, the light path after will merging send to Wave division multiplexing passive optical network center-side equipment with the light path after merging through sending to time division multiplexing EPON center-side equipment after the filtering more along separate routes earlier after along separate routes; Light path after perhaps will merging sends to time division multiplexing EPON center-side equipment and Wave division multiplexing passive optical network center-side equipment respectively through after the filtering.
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| CN2006100926208A CN101098206B (en) | 2006-06-26 | 2006-06-26 | Passive optical network system and light path processing method |
| PCT/CN2007/070016 WO2008003246A1 (en) | 2006-06-26 | 2007-05-14 | A passive optical network system and an optical path processing method thereof |
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| CN101783710A (en) * | 2009-01-15 | 2010-07-21 | 中兴通讯股份有限公司 | Wavelength division multiplexer compatible with two passive optical networks |
| CN101841748B (en) | 2009-03-17 | 2013-06-12 | 中国移动通信集团公司 | Signal transmission system and relevant device |
| CN101873189B (en) * | 2009-04-21 | 2015-01-28 | 中兴通讯股份有限公司 | Wavelength division multiplex (WDM) compatible with two types of passive optical networks (PONs) |
| CN101568046B (en) * | 2009-06-09 | 2011-07-27 | 成都优博创技术有限公司 | Method for realizing coexistence of unsymmetrical 10GEPON and GEPON optical network terminals and system thereof |
| CN101959086A (en) * | 2009-07-15 | 2011-01-26 | 中兴通讯股份有限公司 | Time division multiplex and wavelength division multiplex coexisting passive optical network system and transmission method |
| CN102082610B (en) * | 2009-12-01 | 2014-07-30 | 华为技术有限公司 | Self-injection locking light source and light source self-injection locking method and system |
| CN102075281A (en) * | 2011-01-27 | 2011-05-25 | 中兴通讯股份有限公司 | Transmission method of base station signals, central base station, remote base station and system |
| CN102216822B (en) * | 2011-05-09 | 2013-01-09 | 华为技术有限公司 | Passive optical splitter and passive optical network system |
| CN102439998B (en) * | 2011-10-25 | 2013-12-18 | 华为技术有限公司 | Passive optical network system and downlink transmission method thereof |
| CN103108260A (en) * | 2011-11-11 | 2013-05-15 | 中兴通讯股份有限公司 | Passive optical network system and uplink optical signal and downlink optical signal transmission method |
| CN103139670B (en) * | 2011-11-25 | 2018-04-10 | 中兴通讯股份有限公司 | Passive optical network and uplink and downlink optical signal transmitting method coexists |
| CN103916192B (en) * | 2012-12-31 | 2016-08-03 | 上海贝尔股份有限公司 | Optical network unit, optical line terminal group and optical-fiber network framework |
| JP6522659B2 (en) * | 2014-04-29 | 2019-05-29 | 華為技術有限公司Ｈｕａｗｅｉ Ｔｅｃｈｎｏｌｏｇｉｅｓ Ｃｏ．，Ｌｔｄ． | Wireless communication system and wireless radio frequency device |
| CN104954898B (en) * | 2015-06-01 | 2019-01-01 | 桂林 | A kind of TWDM-PON structure, equipment and the control method of ring sub-network extension |
| CN113311543A (en) * | 2021-06-03 | 2021-08-27 | 四川天邑康和通信股份有限公司 | Novel coarse wavelength division multiplexer assembly |
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| EP0949774A1 (en) * | 1998-04-06 | 1999-10-13 | Nec Corporation | Subscriber optical communications system using bit-interleaved downlink channels |
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