CN101094041B - Method and system for upgrading passive optical network - Google Patents
Method and system for upgrading passive optical network Download PDFInfo
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Abstract
The method includes: using the spreading fiber possessing two stage branches; dividing the down-going band of the passive optical net into multiple wave-lengths; dividing all users into several corresponding user groups; each user group sharing a divided wave-length. The invention realizes the transferring bandwidth expansion of the current time division multiplexing passive optical net (TDMA-PON) and the gradual transition from TDMA-PON to the wave division multiplexing passive optical net (WDM-PON). Thus without changing the user terminal device ONU, the user transmission bandwidth can be increased, both reducing cost and lowering risks.
Description
Technical field
The present invention relates to the passive fiber access technology, concretely, relate to a kind of upgrade method and system of passive optical-fiber network.
Background technology
At present, optical fiber inserts has become the main means that people solve the Access Network bandwidth bottleneck.Optical fiber inserts and not only can satisfy the required bandwidth of the following broad band Integrated service of people, and the bandwidth that provides of optical fiber be existing transmission medium as: copper cash, wireless transmission incomparable.Tradition is based on the Optical Access Network network of point-to-point, except wiring cost is higher, because its outside need active equipment makes operation maintenance cost also higher.EPON (PON, Passive Optical Network) is the tree network structure of a kind of point to multiple spot, and network configuration is simple, fiber resource can be realized sharing, cost is low, and the outside characteristics that do not need to be equipped with source device are acknowledged as the most promising optical fiber access technology.The current time-multiplexed EPON (TDMA-PON) that is widely adopted is exactly one of technology wherein, comprising: APON (asynchronous transfer mode PON), BPON (broadband P ON), EPON (Ethernet PON), GPON (kilomegabit PON) realization technology.Existing TDMA-PON system can adopt one-level or secondary mode (as Fig. 4, shown in Figure 5) along separate routes.TDMA-PON system uplink and downlink have respectively adopted an individual wavelengths.Descending employing broadcast mode, the user receives one's own information according to message identification.Up, all users are by the time division multiplexing mode share transmission link, and each user sends the information of oneself in the timeslice of local side apparatus (as optical line terminal OLT) appointment.Yet along with the increase of user's transmission bandwidth demand, TDMA-PON is difficult to realize that user bandwidth is to higher bandwidth expansion owing to be subjected to the restriction of a uplink burst reception technique and a wavelength transmission bandwidth.Realize the increase of user's transmission bandwidth, just need the number of wavelengths of extending user transmission.Wave division multiplexing passive optical network (WDM-PON) technology of multi-wavelength transmission is considered to satisfy the light access technology of user's final demand.
Related art 1:
Fig. 1 is that TDMA-PON and two of WDM-PON are network coexisted in the solution of same optical fiber distribution network ODN in the prior art 1.As shown in Figure 1, under the situation that does not change original optical fiber distribution network ODN, by newly-built WDM-PON network overlapped (overlay) on the optical distributed network (ODN) of original TDMA-PON network, realized not laying again under the situation of ODN network, finished the construction of new WDM-PON network.
Because the range of receiving broad of the receiver (PD) of optical network unit (ONU) receiving optical signals in the TDM-PON network, though TDMA-PON network and WDM-PON network using the wavelength of different-waveband, but the ONU in the TDM-PON network still can receive the part signal of WDM-PON network, makes the signal of WDM-PON network disturb the terminal equipment ONU generation of TDM-PON network.For fear of of the influence of newly-built WDM-PON network to original TDMA-PON network.Technical scheme shown in Figure 1 has adopted the technology of frequency spectrum shaping line coding (Spectral Shaping Line Codes).Promptly the transmission data of newly-increased WDM-PON network are carried out line coding, by the line coding of transmission data being realized the integer of frequency spectrum in the electric territory.Original baseband frequency spectrum is moved to a higher spectrum position, be similar to and pay carrier multiplexing (SCM), original baseband frequency spectrum is modulated.This just makes can not the overlapping of downlink data of the downlink data of TDMA-PON network and WDM-PON network in the frequency spectrum of electric territory.When the receiver PD of original TDMA-PON network-termination device (Old ONU) receives the light signal of newly-increased network local side apparatus (New OLT) transmission, because it is overlapping that the electric territory frequency spectrum of new, old two network signals does not have, cause the signal of newly-increased WDM-PON network can the received signal of original T DMA-PON network not to be impacted.The signal that old ONU receives the WDM-PON network by PD is in the higher frequency spectrum position outside self normal signal.Therefore old ONU can filter the signal of WDM-PON network by the electrical filter behind the receiver PD, newly-increased WDM-PON network can not impacted the reception of old ONU, thereby realized newly-increased WDM-PON network and the coexistence of original TDMA-PON network on original ODN.
But the shortcoming of above-mentioned prior art 1 is:
1) adopts the line coding mode, increased the speed of physical circuit, reduced the efficient of transmission.Suppose to adopt the 4B/8B coded system, if the business of transmission 5Gbit/s speed, needing the physical circuit transmission rate so is 1OGbit/s, makes the circuit efficiency of transmission reduce half;
2) the present technique solution has just solved the problem of TDMA-PON network and the network coexisted ODN of newly-increased WDM-PON, does not solve the upgrading of TDMA-PON network and the problem that how to carry out the transition to the WDM-PON network of having deposited;
3) when the transmission bandwidth broad of original TDMA-PON network, the realization difficulty that will make the WDM-PON network spectrum move technology increases;
4) the WDM-PON network need increase extra line coding, has increased the cost of equipment accordingly;
Related art 2:
Fig. 2 and Fig. 3 are the employing WDM of prior art 2 realizes WDM-PON in conjunction with the TDMA technology solutions.Wherein Fig. 2 is the implementation structure of WDM-PON up-link, and Fig. 3 is the implementation structure of WDM-PON downlink system.The realization of WDM-PON system combines the WDM technology and the time-multiplexed TDMA technology of wavelength division multiplexing.System realizes being divided into two-stage, and the first order has adopted the WDM technology of wavelength division multiplexing, utilizes a plurality of wavelength multiplexings to organize user terminal more, and every group of user terminal adopts an individual wavelengths.The technology of time-multiplexed TDMA has been adopted in the second level, inserts every group of terminal use.Per 8 terminal uses are one group, one group of shared wavelength of terminal use.
The advantage of the prior art 2 is to utilize the hybrid technology of TDMA and WDM to realize adopting the PON cost of pure WDM technology (wavelength of each user) lower by WDM-PON relatively, can smooth evolution to pure WDM-PON system.But its shortcoming is:
1) be the solution of the WDM-PON that settles at one go, higher with respect to present TDMA-PON cost;
2) the technical program has adopted a kind of implementation of WDM-PON system, employing be to be different from TDM
The wavelength of A-PON wave band does not have consideration how to utilize the upgrading of the realization network of original TDMA-PON network wavelength resource.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of upgrade method and system of EPON, with transmission bandwidth and the progressively transition of solution of expanding existing TDMA-PON network from the TDMA-PON network to the WDM-PON network, thereby do not needing to change under the situation of subscriber terminal equipment ONU, realizing the increase of user's transmission bandwidth.
In order to realize described purpose, technical scheme of the present invention is:
A kind of upgrade method of EPON comprises:
The downstream transmission bandwidth of expansion time division multiplexing EPON.The single downstream wavelength of time division multiplexing EPON is expanded to a plurality of reuse wavelengths, and up wavelength is a single wavelength.
Described method further comprises:
The uplink bandwidth of expansion time division multiplexing EPON expands to a plurality of reuse wavelengths with the single up wavelength of time division multiplexing EPON.
Adopt secondary along separate routes mode lay optical fiber and the downstream band of time division multiplexing EPON be subdivided into a plurality of wavelength, and all users the passive optical network PON interface under are divided into a plurality of users' groups, every group of user shares one and segments wavelength.
Described method also comprises:
Every group of user's uplink and downlink after the division still adopt the mode of TDMA to realize the transmission of uplink and downlink data.
At least one user is organized shared wavelength be subdivided into a plurality of wavelength, make this at least one user organize each interior user and exclusively enjoy a downstream wavelength.
After the up wavelength spread of described process, each user exclusively enjoys a up wavelength, carries out transmission of uplink data.
A kind of upgrade-system of EPON comprises it is characterized in that the optical line terminal OLT and the optical network unit user of time division multiplexing EPON also comprising:
The one-level wave splitter device is used for the downstream band that described optical line terminal OLT is sent is subdivided into a plurality of wavelength, and all users are divided into corresponding a plurality of user's groups, makes each user's group corresponding to a downstream wavelength; This one-level wave splitter device also is used for transmitting up wavelength in time-multiplexed mode.
The secondary wave splitter device is used for that each user is organized corresponding downstream wavelength and is dispensed to the user of this user in organizing, and transmits the uplink and downlink wavelength in time-multiplexed mode.
Described one-level wave splitter device comprises array waveguide grating AWG and coupler.
Described one-level wave splitter device is a wavelength shifter.
A kind of upgrade-system of EPON comprises it is characterized in that the optical line terminal OLT and the optical network unit user of time division multiplexing EPON also comprising:
The one-level wave splitter device is used for the downstream band that described optical line terminal OLT is sent is subdivided into a plurality of wavelength, and all users are divided into corresponding a plurality of user's groups, makes each user's group corresponding to a downstream wavelength;
The secondary wave splitter device, being used for that at least one user is organized corresponding downstream wavelength, to be subdivided into a plurality of wavelets again long, and is dispensed to this user each user in organizing, and makes this user organize each interior user corresponding to different downstream wavelength.
Described one-level wave splitter device is array waveguide grating AWG or light wave transducer.
Described secondary wave splitter device is array waveguide grating AWG.
Beneficial effect of the present invention is:
1) during the extended network downlink bandwidth, do not need to change terminal equipment ONU;
2) be that a kind of TDMA-PON network progressively is upgraded to the implementation of WDM-PON, rather than the realization of the WDM-PON that directly settles at one go.The mode of this solution has reduced the initial investment cost of operator, has reduced risk;
3) make extension of network simple, reduced maintenance, the operation cost of operator;
4) can be implemented to the progressively transition of WDM-PON.
Description of drawings
Fig. 1 a is the implementation structure of TDMA-PON of the prior art and WDM-PON coexistence;
Fig. 1 b is the realization schematic diagram of TDMA-PON and WDM-PON coexistence in the prior art;
Fig. 2 is the implementation structure of WDM-PON up-link in the prior art 2;
Fig. 3 is the implementation structure of WDM-PON downlink system in the prior art 2;
TDMA-PON system construction drawing when Fig. 4 is the shunt of available technology adopting one-level;
TDMA-PON system construction drawing when Fig. 5 is the shunt of available technology adopting secondary;
Fig. 6 is the system construction drawing of realization downlink bandwidth expansion of the present invention;
Fig. 7 is the AWG of realization downlink bandwidth expansion among the present invention and the structured flowchart of coupler;
Fig. 8 is for realizing the system construction drawing of upstream bandwidth expansion among the present invention;
Fig. 9 is a system construction drawing of realizing wavelength division multiplexing by wavelength shifter of the present invention.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, specific embodiments of the invention are elaborated below in conjunction with accompanying drawing.
The present invention is intended to utilize original TDMA-PON network wavelength resource to realize the upgrading of network, and progressively evolves to the WDM-PON network.For this reason, the present invention can divide two stages to carry out: the downlink bandwidth that at first is the original TDMA-PON network of expansion, make the WDM technology of a plurality of wavelength of descending employing, the up original T dma mode that still keeps promptly adopts TDMA to realize user's downlink bandwidth growth of requirement in conjunction with the mode of WDM.Along with the user bandwidth growth of requirement, can carry out second stage again, realize progressively carrying out the transition to the WDM-PON network from the TDMA-PON network, promptly each user's uplink and downlink adopts an individual wavelengths respectively, realizes the expansion fundamentally of user's transmission bandwidth.Therefore, the present invention can realize from two aspects:
1) realization of TDMA-PON network downlink bandwidth expansion;
2) the TDMA-PON network is to the realization of WDM-PON network transition.
From this two invention the present invention is described respectively below.
One, the realization of TDMA-PON network downlink bandwidth expansion:
Original TDMA-PON network system is a time division multiplex system, and a plurality of users carry out transmission of Information on a shared wavelength.Owing to be subjected to the restriction of single wavelength and uplink burst reception technique, make the transmission rate of TDMA-PON network be difficult to higher speed development.Expand the transmission bandwidth of original TDMA-PON network, then need to consider the expansion of wavelength.The transmission means that can replace an original wavelength by the transmission of adopting a plurality of wavelength realizes the increase of TDMA-PON Network Transmission bandwidth.
Technical scheme of the present invention is by realizing in conjunction with the wiring method of optical fiber distribution network ODN and the WDM technology of wavelength division multiplexing.By segmentation (TDMA-PON standard code to the downlink transfer wavelength of legacy network, downstream wavelength is between wave band 1480nm～1500nm), for example: is the wavelength division in 1480nm～1500nm wave band that certain wavelength interval is (as 0.8nm or 0.4nm etc., but be not limited to this, can set according to demand) a plurality of wavelength, the quantity of expanded downstream transmission wavelength.Simultaneously the user of original TDMA-PON network is divided into a plurality of groups, every group of user distributes a wavelength.Transmission by a plurality of wavelength transmission replace single wavelength ripple to pass realizes the expansion of each terminal use's downlink bandwidth.
Upgrade if realize the future of TDMA-PON network, when building the TDMA-PON network, just need consider the framework of the ODN network of laying.At the networking initial stage, if laying, TDMA-PON network ODN network only adopts one-level mode along separate routes, as Fig. 4, the upgrading of TDMA-PON network realizes comparatively difficulty after will making so.During network upgrade, need carry out bigger change to original ODN network, need change original one-level into secondary along separate routes along separate routes, and the optical fiber that causes all users under the original splitter all needs to reconnect, the change of network is relatively very big, and can not satisfy the demand of customer upgrade in a short period of time.
Therefore, consider the upgrading in future of TDMA-PON network, when the ODN network lays, just need the framework of considering that the ODN network is laid.If splitter (Splitter) lays according to two-stage.Can make the change of distant-end node (RN) very little so that the escalation process of TDMA-PON network is very simple later on so.The two-stage laying structure of existing ODN network can be as shown in Figure 5, and as the branching ratio of first order employing 1:4, the branching ratio of 1:8 is adopted in the second level, and two-layer configuration is finally realized the branching ratio of 1:32.But the present invention only is not limited to also can adopt other branching ratio based on the branching ratio of the two-stage shown in Fig. 5.When the TDMA-PON network will be realized the downlink transfer speed upgrade, only need be replaced by the AWG+ coupler to the splitter of the first order (Splitter) gets final product, realize the partial wave of user's downstream wavelength by the AWG in the AWG+ coupler after changing, utilize coupler to realize up user's information multiplexing, the remaining part of ODN network does not need to do any change.
After the replacing of splitter in finishing the ODN network (Splitter), by segmentation to original TDMA-PON downstream band, mark off a plurality of wavelength, utilize WDM wavelength multiplexing technology, make that every group of terminal use is descending to adopt a wavelength respectively, concrete system realizes as Fig. 6.
In order to realize the expansion of terminal use's downlink bandwidth, technical scheme of the present invention is adopted the descending multiplexing WDM technology of many ripples that adopted, and uply still keeps original TDMA mode.Increase user's downlink bandwidth by expansion to downstream wavelength.
As shown in Figure 6, local side apparatus OLT is subdivided into a plurality of wavelength to the downstream band of original TDMA-PON network, and originally downlink information adopts the transmission of a wavelength to change into and adopts a plurality of wavelength transmission.According to the downstream wavelength number that marks off, all users of an original shared downstream wavelength are divided into many group users again.Every group of user adopts the wavelength after the segmentation to transmit separately.Promptly be equivalent to share a wavelength and become shared a plurality of wavelength, thereby realized the increase of user's downlink bandwidth by all original users.
The segmentation of wavelength is to divide in the 20nm scope that is centre wavelength with original downstream wavelength 1490nm.And the range of receiving of original terminal equipment ONU receiver is 1490 being the center, about the about 20nm of range of receiving.The segmentation of wavelength can not influence the normal reception of original terminal equipment ONU.Therefore can under the situation that does not change original terminal equipment ONU, realize the expansion of TDMA-PON network downlink bandwidth.
In the system configuration of Fig. 6, ODN network using two-stage partial wave, the first order adopts array waveguide grating, and main line optical fiber is divided into 4 branch road optical fiber, promptly all users is divided into 4 groups.Adopt 1:8 optical splitter (second level) under each branch optical fiber again, promptly each group comprises 8 users.Local side apparatus OLT is the wavelength of the descending 1490nm of original TDMA-PON network (being that 1490nm is the interior wavelength of 20nm scope of centre wavelength) to be subdivided into 4 wavelength at interval with 2nm, as: λ 1 (1488nm), λ 2 (1490nm), λ 3 (1492nm), λ 4 (1494nm), λ 1 distributes to first group of user, λ 2 distributes to second group of user, λ 3 distributes to the 3rd group of user, and λ 4 distributes to the 4th group of user.4 groups of shared up wavelength X of mode (1310nm) that the user still adopts TDMA.Each independently downstream wavelength shared by 8 users.Original relatively 1 downstream wavelength is shared by 32 users, and downlink bandwidth has increased by 4 times than originally.
Realize the descending WDM of network, the mode of up TDMA, the first order splitter (Splitter) in the ODN network shown in Figure 5 need change AWG+ coupler device (as Fig. 6) into.
The function of AWG+ coupler device realizes seeing Fig. 7.The AWG+ coupler device possesses two functions: descending have a wavelength filtering function, filters out different wavelength; Up function with users multiplexing information.Because the up TDMA mode that still adopts a wavelength if just optical splitter (Splitter) is changed into AWG, so then can make up transmission wavelength can't pass AWG, therefore to use the AWG+ coupler device at this.The AWG+ coupler device can be realized by two equipment, also can integrate AWG and Splitter function, is realized by an equipment.
The upgrading of TDMA network has promptly realized the increase of user's transmission bandwidth on the basis of original TDMA network.This mode had both prolonged the useful life of TDMA-PON network, had protected the network investment of telecom operators again.
Two, the TDMA-PON network is realized to the evolution of WDM-PON network:
As above process has just realized the expansion of TDMA-PON network downlink bandwidth.When the user will realize the expansion of upstream bandwidth, also need to consider up multi-wavelength expansion.In fact be exactly the realization (each user's uplink and downlink exclusively enjoys a wavelength respectively) of final WDM-PON.System configuration such as Fig. 8 will realize the transition of TDMA-PON to the WDM-PON network, on the basis of realizing first step TDMA-PON network downlink bandwidth expansion scheme, need to realize the expansion of up multi-wavelength.Promptly need the second level splitter (Splitter) in the ODN network is replaced by AWG, the wavelength of the first order is further segmented again, realize that finally each user exclusively enjoys a downlink transfer wavelength by partial AWG; In addition, because each ONU exclusively enjoys a up wavelength, the ONU of the same wavelength of original up employing that makes can not continue to use, and in this case, needs to change conventional ONU; By above-mentioned two the step can realize that each user's upper and lower provisional capital exclusively enjoys the WDM-PON system of a wavelength, thereby finished seamlessly transitting to the WDM-PON system.Among this embodiment, first order AWG is a Coarse Wave Division Multiplexer, and partial AWG is thin wavelength division multiplexer.By the two-stage wavelength division multiplexing, realize the distribution of a wavelength of each user.
Describe for example below: the AWG by the first order is divided into 4 wavelength: λ 1, λ 2, λ 3 and λ 4 from the wavelength of local side apparatus OLT transmission, these 4 wavelength are delivered to partial splitter (Splitter) or AWG respectively, if will arrive WDM-PON to the 4th group customer upgrade, the 4th group splitter is replaced by the AWG of a 1x8 port.At down direction, by the AWG that changes downstream wavelength λ 4 residing wave bands be subdivided into again 8 wavelength: λ 41, λ 42 ..., λ 48, make 8 users of the 4th group, each user can exclusively enjoy a downstream wavelength.Up direction can use and the same mode of down direction expansion wavelength, promptly up wavelength X 4n is divided into 8 wavelength: λ 4n1, λ 4n2 ..., λ 4n8.By segmentation, thereby realized the transition of TDM-PON to WDM-PON to TDMA-PON network uplink and downlink wavelength.In the present embodiment, can all be upgraded to WDM-PON, also can be only wherein one group or several groups be upgraded to WDM-PON four groups of users.If all users are upgraded to WDM-PON, because each user can exclusively enjoy a up wavelength, no longer need coupler, then the coupler among Fig. 8 just can remove.If the certain customers' group among four groups of users is upgraded, then coupler needs to keep, and the user who shares a up wavelength still needs to transfer to local side apparatus OLT through described coupler.The user who exclusively enjoys up wavelength can directly carry out the transmission of up wavelength via AWG.
Embodiment 2
The present invention can also realize by another kind of approach, is exactly to pass through the expansion of the mode of wavelength Conversion with the original TDMA-PON network bandwidth, and implementation structure as shown in Figure 9.Every group of TDMA-PON user adopts an independent uplink and downlink wavelength respectively.As: first group of user's up wavelength X u is converted to λ u1, and downstream wavelength λ d is converted to λ d1.The rest may be inferred, and the 4th group of user's up wavelength X u is converted to λ u4, and downstream wavelength λ d is converted to λ d4.
Present embodiment is the another kind of implementation of TDMA-PON network upgrade.Realize multiplexing to many groups TDMA-PON user by increasing one-level WDM.
Because every group of user's of original TDMA-PON network upper and lower provisional capital is to adopt identical wavelength, realize that these adopt the multiplexing of identical wavelength user group, just must change the wavelength of identical TDMA-PON into the different wave length of WDM, thereby realize organizing the multiplexing of TDMA-PON users more by WDM.The key of this realization technical scheme is: the first order " wavelength shifter " realizes, promptly by " wavelength shifter " second level is not used identical wavelength on the same group, converts the different wavelength of the first order to.The implementation of wavelength shifter has three kinds:
1, based on current technology, wavelength shifter can adopt the mode of " light changes electricity, and electricity changes light " to realize wavelength Conversion.
2, consider from the realization technology in future, can in the light territory, directly realize wavelength Conversion; For example:
Utilize active optical cavity to finish energy delivery between the different wave length, thereby realize wavelength Conversion in the light territory.
3, the mode by distribution realizes, wavelength shifter is equivalent to a distributing frame, selects different wave length by the distribution of selecting to connect different wave length.
In sum, the present invention is that a kind of TDMA-PON network progressively is upgraded to the implementation of WDM-PON, rather than the realization of the WDM-PON that directly settles at one go.The mode of this solution has reduced the initial investment cost of operator, has reduced risk; And make extension of network simple, reduced maintenance, the operation cost of operator; Can be implemented to the progressively transition of WDM-PON.
Above embodiment only is used to illustrate the present invention, but not is used to limit the present invention.Within the spirit and principles in the present invention all, any modification of being made, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (11)
1. the upgrade method of an EPON is characterized in that, comprises the steps:
The downstream transmission bandwidth of expansion time division multiplexing EPON expands to a plurality of reuse wavelengths with the single downstream wavelength of time division multiplexing EPON; Wherein, adopt secondary along separate routes mode lay optical fiber and the downstream band of time division multiplexing EPON be subdivided into a plurality of wavelength, and all users the passive optical network PON interface under are divided into a plurality of users' groups, every group of user shares one and segments wavelength.
2. method according to claim 1 is characterized in that further comprising:
The uplink bandwidth of expansion time division multiplexing EPON expands to a plurality of reuse wavelengths with the single up wavelength of time division multiplexing EPON.
3. method according to claim 1 is characterized in that also comprising:
Every group of user's uplink and downlink after the division still adopt the mode of TDMA to realize the transmission of uplink and downlink data.
4. method according to claim 1 is characterized in that:
At least one user is organized shared wavelength be subdivided into a plurality of wavelength, make this at least one user organize each interior user and exclusively enjoy a downstream wavelength.
5. method according to claim 2 is characterized in that:
After the up wavelength spread of described process, each user exclusively enjoys a up wavelength, carries out transmission of uplink data.
6. the upgrade-system of an EPON comprises it is characterized in that the optical line terminal OLT and the optical network unit user of time division multiplexing EPON also comprising:
The one-level wave splitter device is used for the downstream band that described optical line terminal OLT is sent is subdivided into a plurality of wavelength, and all users are divided into corresponding a plurality of user's groups, makes each user's group corresponding to a downstream wavelength; This one-level wave splitter device also is used for transmitting up wavelength in time-multiplexed mode.
The secondary wave splitter device is used for that each user is organized corresponding downstream wavelength and is dispensed to the user of this user in organizing, and transmits the uplink and downlink wavelength in time-multiplexed mode.
7. system according to claim 6 is characterized in that:
Described one-level wave splitter device comprises array waveguide grating AWG and coupler.
8. system according to claim 6 is characterized in that:
Described one-level wave splitter device is a wavelength shifter.
9. the upgrade-system of an EPON comprises it is characterized in that the optical line terminal OLT and the optical network unit user of time division multiplexing EPON also comprising:
The one-level wave splitter device is used for the downstream band that described optical line terminal OLT is sent is subdivided into a plurality of wavelength, and all users are divided into corresponding a plurality of user's groups, makes each user's group corresponding to a downstream wavelength;
The secondary wave splitter device, being used for that at least one user is organized corresponding downstream wavelength, to be subdivided into a plurality of wavelets again long, and is dispensed to this user each user in organizing, and makes this user organize each interior user corresponding to different downstream wavelength.
10. system according to claim 9 is characterized in that:
Described one-level wave splitter device is array waveguide grating AWG or light wave transducer.
11. system according to claim 10 is characterized in that:
Described secondary wave splitter device is array waveguide grating AWG.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| PCT/CN2007/001958 WO2008000164A1 (en) | 2006-06-23 | 2007-06-22 | A renewing method and system of passive optical network |
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| CN101521837B (en) * | 2009-02-24 | 2011-08-31 | 上海大学 | System and method for achieving online updating for dynamic wavelength division multiplexing passive optical network |
| CN103222212B (en) * | 2010-09-15 | 2016-01-06 | 瑞典爱立信有限公司 | Connect in multi-rate optical network |
| CN105681933B (en) * | 2016-04-21 | 2019-03-19 | 北京电信规划设计院有限公司 | The shared method of base station wireless resource is realized based on passive optical network |
| CN108882062B (en) * | 2018-05-29 | 2021-06-15 | 烽火通信科技股份有限公司 | Passive optical network asymmetric system and management method thereof |
| CN109040863B (en) * | 2018-05-29 | 2021-03-30 | 烽火通信科技股份有限公司 | Capacity expansion method and system based on passive optical network system |
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| US5872645A (en) * | 1994-07-07 | 1999-02-16 | Gpt Limited | Telecommunications network |
| CN1430348A (en) * | 2002-01-03 | 2003-07-16 | 阿尔卡塔尔公司 | Time-division multiplexing and wave-division multiplexing optical exchange node |
| CN1787419A (en) * | 2004-12-07 | 2006-06-14 | 冲电气工业株式会社 | Optical communication network |
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| US6925263B2 (en) * | 2001-09-28 | 2005-08-02 | Intel Corporation | Method and apparatus for transmission of upstream data in an optical network |
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| US5872645A (en) * | 1994-07-07 | 1999-02-16 | Gpt Limited | Telecommunications network |
| CN1430348A (en) * | 2002-01-03 | 2003-07-16 | 阿尔卡塔尔公司 | Time-division multiplexing and wave-division multiplexing optical exchange node |
| CN1787419A (en) * | 2004-12-07 | 2006-06-14 | 冲电气工业株式会社 | Optical communication network |
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