CN104080018A - TWDM-PON transmission system with load aggregating and energy-saving functions - Google Patents
TWDM-PON transmission system with load aggregating and energy-saving functions Download PDFInfo
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Abstract
The invention provides a TWDM-PON transmission system with load aggregating and energy-saving functions. The TWDM-PON transmission system comprises a plurality of subsystems and a first periodic array waveguide grating, wherein all the subsystems are connected in parallel through the first periodic array waveguide grating. Each subsystem comprises an adjustable downlink transmitter device, an uplink data processing device, a first optical circulator, an optical amplifier, feeder line type optical fibers, a shunt combiner and an optical network unit, wherein the adjustable downlink transmitter device is connected with a first end of the first optical circulator through the first periodic array waveguide grating, a third end of the optical circulator respectively and sequentially passes through the optical amplifier, the feeder line type optical fibers and the shunt combiner and then is connected with the optical network unit, and the uplink data processing device is connected with a second end of the optical circulator. The periodic array waveguide grating passive device is adopted, load aggregating and dynamic wavelength routing are achieved in the TWDM-PON system, the TWDM-PON system can be compatible with an existing TWDM-PON network, and energy consumption of the system is reduced.
Description
Technical field
The present invention relates to optical communication technique neck, particularly, relate to the TWDM-PON transmission system with load aggregation and power saving function based on cyclic array waveguide raster.
Background technology
Along with the development of the communication technology and the variation of people's demand, a large amount of new business continue to bring out, and comprise that the transmission of ultra high-definition image/video, cloud computing, cloud storage, data center etc. have higher requirement for network capacity.Meanwhile, in Modern Urban Living, people get back to residential block evening and have a rest in city CBD work daytime, have caused thus " tidal effect " of the Large-scale Migration of communication data flow.By day, data traffic concentrates in the CBD of city, and the data traffic in residential block seldom, be not fully used by network bandwidth resources; At night, data traffic concentrates on residential block, data traffic in the CBD of city seldom, this phenomenon has caused a large amount of idle of bandwidth resources and the problem that is not used, and, no matter, in CBD or residential block, accident or hot zones may cause local data traffic to explode, and can cause network congestion and cannot access.Therefore, on the one hand, network faces resources idle is not used and wasting situation, and on the other hand, when the request of part burst mass data, Internet resources deficiency makes again network congestion, and user's demand is not being met.To sum up, need to find a kind of new network architecture real-time data traffic demand is made to response, dynamically distribution network bandwidth resources, realize the rational management of Internet resources, thereby meet to greatest extent user's demand.
The TWDM-PON system transmission structure with load aggregation and power saving function based on cyclic array waveguide raster is the new structure that in configuration, AWGR device forms in traditional TWDM-PON network.Based on the time division multiplexing EPON TWDM-PON stacking with wavelength division multiplexing, because of it, be embodied as the main development direction of this relative low, compatibility good advantages such as (not changing existing ODN network configuration) is considered to NG-PON2.Yet in common TWDM-PON system, network bandwidth resources is fixed, can not make according to demand and at any time response, yet this is the major issue that realizes offered load polymerization.
Cyclic array waveguide raster AWGR (Arrayed Wavelength Grating Router) is one group of AWG array.AWGR device is configured in TWDM-PON system as a passive module, and system configuration is simple, and AWGR device can with traditional TWDM-PON system compatible.Array waveguide grating has important application on wavelength-division multiplex technique, and cyclic array waveguide raster can be realized the multiplexing and demultiplexing of multi-wavelength light, therefore, AWGR can be introduced to TWDM-PON system.At present, the TWDM-PON system transmission structure pertinent literature with load aggregation and power saving function based on cyclic array waveguide raster is relative less.And the TWDM-PON system configuration based on cyclic array waveguide raster in the past can not load aggregation.
Through existing literature search, find, the Ning Cheng of Huawei Company, the people such as Lei Wang deliver " Flexible TWDM PON with Load Balancing and Power Saving " in European Conference On Optical Communication (ECOC) in 2013 meeting.In the document, author has proposed a kind ofly can realize load balancing and the energy-conservation system of TWDM-PON flexibly.In order to realize the load balancing in network, author has proposed a kind of new structure of TWDM-PON flexibly, and this structure has comprised optical line terminal (OLT) transceiver and mixed AWG/Splitter.Mixing AWG/Splitter by 4 * 4 and adjustable transceiver module carry out the allotment of wavelength between same ODN or different ODN, thereby realize Network Load Balance.In this structure, in order to realize wavelength route, Cyclic AWG and Power Splitter mixed structure have been designed, scheduling of resource and load balancing have been realized, but this structure is for load being distributed on different wavelength, be unfavorable for the energy-conservation of system, in addition, the structure that Huawei proposes is comparatively complicated, in construction, maintenance and the escalation process of network, brings unnecessary trouble.
Summary of the invention
For defect of the prior art, the object of this invention is to provide a kind of TWDM-PON system transmitting device with load aggregation and power saving function.
According to the TWDM-PON transmission system with load aggregation and power saving function provided by the invention, comprising: several subsystems and period 1 property array waveguide grating; Some subsystems connect side by side by period 1 property array waveguide grating;
Subsystem comprises that descending adjustable transmitter capable device, upstream data processing unit, the first optical circulator, light send out device large, branched system optical fiber, mixer and optical network unit along separate routes;
Wherein, descending adjustable transmitter capable device connects the first end of the first optical circulator by period 1 property array waveguide grating; The 3rd end of the first optical circulator respectively successively by light send out device large, branched system optical fiber, mixer connecting optical network unit along separate routes; Upstream data processing unit connects respectively the second end of the first optical circulator.
Preferably, it is characterized in that, descending adjustable transmitter capable device comprises several descending adjustable transmitter capable modules, property second round array waveguide grating and dispersion/chirp management unit;
Wherein, several descending adjustable transmitter capable modules connect respectively the input of described dispersion/chirp management unit by property second round array waveguide grating, and the output of described dispersion/chirp management unit connects described period 1 property array waveguide grating.
Preferably, several upstream data processing unit comprise several upstream data processing units, several photodetectors, period 3 property array waveguide grating and dispersion/chirp management unit;
Wherein, several upstream data processing units connect respectively the output of described period 3 property array waveguide grating by photodetector, the second end of described the first optical circulator connects the input of described period 3 property array waveguide grating by dispersion/chirp management unit.
Preferably, optical network unit comprises the second optical circulator, tunable filter, receiver and up adjustable transmitter capable;
Wherein, the second port of the second optical circulator connects described shunt mixer by distribution type fiber-optic, and the 3rd port of the second optical circulator is connected to described receiver by tunable filter; Upward signal is connected to the first port of the second optical circulator by the output of up adjustable transmitter capable.
Preferably, mixer comprises optical branching device and optical combiner along separate routes; Optical branching device is for being distributed to downstream signal along separate routes by light each optical network unit being attached thereto, and optical combiner is for being coupled the upward signal of optical network unit.
Preferably, period 1 property array waveguide grating adopts N*N type cyclic array waveguide raster; Property second round array waveguide grating and period 3 property array waveguide grating adopt 1*N type cyclic array waveguide raster, and wherein N is 2
n, n is greater than 2 natural number.
Preferably, downstream transmitter modular is adjustable, tuning range be from
be tuned as
wherein,
be m downstream wavelength,
for m downstream wavelength after modulation, m is 2
n, n is greater than 2 natural number, and d represents descending.
Preferably, the quantity of descending adjustable transmitter capable module and upstream data processing unit is M, and M is 2
n, n is greater than 2 natural number.
Preferably, tunable filter adopts band pass filter or periodic filter.
Compared with prior art, the present invention has following beneficial effect:
1, the present invention utilizes cyclic array waveguide raster can carry out dynamic wavelength route, realizes the load aggregation of network;
2, the cyclic array waveguide raster in the present invention can be compatible mutually with traditional TWDM-PON system well, is easy to carry out upgrading on existing network basis;
3, the present invention is simple in structure, not only in single sub-passive network, can realize load aggregation, and can realize too in different sub-systems; When in network, data traffic is less, flow can be focused on certain several wavelength, thus can its commplementary wave length is idle, turn off transmitter, not only take full advantage of in network bandwidth resources but also can reach energy-conservation object.
Accompanying drawing explanation
By reading the detailed description of non-limiting example being done with reference to the following drawings, it is more obvious that other features, objects and advantages of the present invention will become:
Fig. 1 is structural representation of the present invention.
In figure:
1 is shunt mixer;
2 is branched system optical fiber;
3 is image intensifer;
4 is the first optical circulator;
5 is the second optical circulator.
Embodiment
Below in conjunction with specific embodiment, the present invention is described in detail.Following examples will contribute to those skilled in the art further to understand the present invention, but not limit in any form the present invention.It should be pointed out that to those skilled in the art, without departing from the inventive concept of the premise, can also make some distortion and improvement.These all belong to protection scope of the present invention.
In the present embodiment, as shown in Figure 1, the TWDM-PON transmission system with load aggregation and power saving function provided by the invention, comprising: several subsystems and period 1 property array waveguide grating; Each subsystem connects side by side by period 1 property array waveguide grating; Subsystem comprises that descending adjustable transmitter capable device, upstream data processing unit, the first optical circulator 4, light send out device large, branched system optical fiber 2, mixer 1 and optical network unit along separate routes; Wherein, descending adjustable transmitter capable device connects the first end of the first optical circulator 4 by period 1 property array waveguide grating; The 3rd end of the first optical circulator 4 respectively successively by light send out device large, branched system optical fiber 2, mixer 1 connecting optical network unit along separate routes; Upstream data processing unit connects respectively the second end of the first optical circulator 4.
Descending adjustable transmitter capable device comprises several descending adjustable transmitter capable modules, property second round array waveguide grating and dispersion/chirp management unit; Wherein, several descending adjustable transmitter capable modules connect respectively the input of described dispersion/chirp management unit by property second round array waveguide grating, and the output of described dispersion/chirp management unit connects described period 1 property array waveguide grating.
Several upstream data processing unit comprise several upstream data processing units, several photodetectors, period 3 property array waveguide grating and dispersion/chirp management unit; Wherein, several upstream data processing units connect respectively the output of described period 3 property array waveguide grating by several photodetectors, the second end of described the first optical circulator 4 connects the input of described period 3 property array waveguide grating by dispersion/chirp management unit.
Optical network unit comprises the second optical circulator 5, tunable filter, receiver and up adjustable transmitter capable; The second port of the second optical circulator connects the 3rd port of mixer 1, the second optical circulator along separate routes by distribution type fiber-optic and is connected to described receiver by tunable filter; Upstream data. signals is connected to the first port of optical circulator by the output of up adjustable transmitter capable.Mixer 1 comprises optical branching device and optical combiner along separate routes; Optical branching device is for being distributed to downstream signal along separate routes by light each optical network unit being attached thereto, and optical combiner is for being coupled the upward signal of optical network unit.Tunable filter adopts band pass filter or periodic filter.
Period 1 property array waveguide grating adopts N*N type cyclic array waveguide raster; Property second round array waveguide grating and period 3 property array waveguide grating adopt 1*N type cyclic array waveguide raster.Period 1 property array waveguide grating is second level cyclic array waveguide raster; Property second round array waveguide grating and period 3 property array waveguide grating are first order cyclic array waveguide raster.
Wherein, descending adjustable transmitter capable module is connected to first order cyclic array waveguide raster 1, first order cyclic array waveguide raster 1 is connected to dispersion/chirp management unit, dispersion/chirp management unit is connected to second level cyclic array waveguide raster, second level cyclic array waveguide raster is connected to the first optical circulator the 1st port, from the 3rd port output of the first optical circulator, pass through successively described image intensifer 3, branched system optical fiber 2 is connected to passback and forward pass, through splitter, be connected to optical network unit, through the second optical circulator, tunable filter sends the data to receiver, complete the transmission of downlink data, at optical network unit end, data from domestic consumer are sent through up adjustable transmitter capable, the second optical circulator through optical network unit end, be connected to branched system optical fiber 2, branched system optical fiber 2 is connected to image intensifer 3, image intensifer 3 is connected to the first optical circulator the 3rd port, from first optical circulator the second port output, be connected to dispersion/chirp management unit, dispersion/chirp management unit is connected to first order cyclic array waveguide raster 2, through photoelectric detector, be input to upstream data processing unit, complete the reception & disposal of upstream data, the quantity of descending adjustable transmitter capable module and upstream data processing unit is M, and M is 2
n, n is greater than 2 natural number.Dispersion/chirp management module represents dispersion management module or chirp management module, when in long Distance Transmission, uses dispersion management module, uses chirp management module when growing Distance Transmission with direct modulated laser.
As Fig. 1, descending adjustable transmitter capable module sends one group of downstream signal, and its wavelength is respectively
by described first order cyclic array waveguide raster, carry out partial wave, then through second level cyclic array waveguide raster, different wave length is assigned to the different optical network units in subsystem.On up direction, upward signal, through shunt mixer 1, from the 2nd port transmission to period 3 property array waveguide grating, is finally processed at upstream data processing unit settling signal after optical circulator the 3rd port.
Each subsystem is equipped with up adjustable transmitter capable, on the one hand, in certain subsystem during not polymerization of load, for example, when load on certain a pair of up-downgoing wavelength is excessive, by handle use this some data traffic to wavelength be transposed to the less wavelength of other load to upper realization the load aggregation in same subsystem.
On the other hand, when there is not polymerization of load between different sub-systems, for example the load on some subsystems is excessive, and load on another subsystem is less, simultaneously the less subsystem of load is used a pair of wavelength just can meet up-downgoing data traffic demand and other M-1 when wavelength is placed in to idle condition, by the tuning tranmitting frequency of descending tunable laser module in descending adjustable transmitter capable module, make M-1 free wavelength after tuning through cyclic array waveguide raster, be assigned in the excessive subsystem of load, in the excessive subsystem of load, just on the basis of original M wavelength, dynamically increased like this M-1 wavelength, expanded the capacity of this subsystem, realized the load aggregation in different sub-systems.
When user side does not have a large amount of data traffic requests, the bandwidth resources in network are not fully used, and up-downgoing transceiver, all the time in operating condition, causes the waste of bandwidth and the unnecessary consumption of the energy.After reasonably dispatching in network, data traffic is concentrated on certain several wavelength and leaves unused and remain wavelength simultaneously, close laser corresponding to residue wavelength, for example, in some subsystems, data traffic is relatively less, and flow is focused on to wavelength
upper, simultaneously idle
close
corresponding laser just can meet user's user demand, thereby make whole system more energy-conservation in the situation that only using part laser.
When descending adjustable transmitter capable module and upstream data processing unit employing directly modulated lasers, need dispersion/chirp management unit, if without directly modulated lasers, can not add dispersion/chirp management unit.
The present embodiment adopts the TWDM-PON system transmission structure with load aggregation and power saving function based on cyclic array waveguide raster, has advantages of following:
1, the present invention adopts cyclic array waveguide raster device, can be well and existing TWDM-PON system compatible, and system configuration is simpler, and the system of being beneficial to is carried out smooth upgrade, and then can reduce to a certain extent PON upgrade cost;
2, the present invention carries out wavelength route by cyclic array waveguide raster, can between same subsystem and different sub-systems, the scheduling by wavelength realize load aggregation, for solving " tidal effect ", provides an easy method;
3, the present invention when traffic demand is very little in network, in the situation that guaranteeing that data traffic up-downgoing requires, by idle redundancy wavelength, turns off the tunable laser of corresponding wavelength, makes entire system more energy-conservation.
Above specific embodiments of the invention are described.It will be appreciated that, the present invention is not limited to above-mentioned specific implementations, and those skilled in the art can make various distortion or modification within the scope of the claims, and this does not affect flesh and blood of the present invention.
Claims (9)
1. a TWDM-PON transmission system with load aggregation and power saving function, is characterized in that, comprising: several subsystems and period 1 property array waveguide grating; Some subsystems connect side by side by period 1 property array waveguide grating;
Subsystem comprises that descending adjustable transmitter capable device, upstream data processing unit, the first optical circulator, light send out device large, branched system optical fiber, mixer and optical network unit along separate routes;
Wherein, descending adjustable transmitter capable device connects the first end of the first optical circulator by period 1 property array waveguide grating; The 3rd end of the first optical circulator respectively successively by light send out device large, branched system optical fiber, mixer connecting optical network unit along separate routes; Upstream data processing unit connects respectively the second end of the first optical circulator.
2. the TWDM-PON transmission system with load aggregation and power saving function according to claim 1, it is characterized in that, descending adjustable transmitter capable device comprises several descending adjustable transmitter capable modules, property second round array waveguide grating and dispersion/chirp management unit;
Wherein, several descending adjustable transmitter capable modules connect respectively the input of described dispersion/chirp management unit by property second round array waveguide grating, and the output of described dispersion/chirp management unit connects described period 1 property array waveguide grating.
3. the TWDM-PON transmission system with load aggregation and power saving function according to claim 1 and 2, it is characterized in that, several upstream data processing unit comprise several upstream data processing units, several photodetectors, period 3 property array waveguide grating and dispersion/chirp management unit;
Wherein, several upstream data processing units connect respectively the output of described period 3 property array waveguide grating by photodetector, the second end of described the first optical circulator connects the input of described period 3 property array waveguide grating by dispersion/chirp management unit.
4. the TWDM-PON transmission system with load aggregation and power saving function according to claim 3, is characterized in that, optical network unit comprises the second optical circulator, tunable filter, receiver and up adjustable transmitter capable;
Wherein, the second port of the second optical circulator connects described shunt mixer by distribution type fiber-optic, and the 3rd port of the second optical circulator is connected to described receiver by tunable filter; Upward signal is connected to the first port of the second optical circulator by the output of up adjustable transmitter capable.
5. the TWDM-PON transmission system with load aggregation and power saving function according to claim 1, is characterized in that, mixer comprises optical branching device and optical combiner along separate routes; Optical branching device is for being distributed to downstream signal along separate routes by light each optical network unit being attached thereto, and optical combiner is for being coupled the upward signal of optical network unit.
6. the TWDM-PON transmission system with load aggregation and power saving function according to claim 3, is characterized in that, period 1 property array waveguide grating adopts N*N type cyclic array waveguide raster; Property second round array waveguide grating and period 3 property array waveguide grating adopt 1*N type cyclic array waveguide raster, and wherein N is 2
n, n is greater than 2 natural number.
7. the TWDM-PON transmission system with load aggregation and power saving function according to claim 2, is characterized in that, downstream transmitter modular is adjustable, tuning range be from
be tuned as
wherein,
be m downstream wavelength,
for m downstream wavelength after modulation, m is 2
n, n is greater than 2 natural number, and d represents descending.
8. the TWDM-PON transmission system with load aggregation and power saving function according to claim 3, is characterized in that, the quantity of descending adjustable transmitter capable module and upstream data processing unit is M, and M is 2
n, n is greater than 2 natural number.
9. the TWDM-PON transmission system with load aggregation and power saving function according to claim 4, is characterized in that, tunable filter adopts band pass filter or periodic filter.
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| CN105511016A (en) * | 2015-12-15 | 2016-04-20 | 上海交通大学 | Port number asymmetric array waveguide grating router and application thereof |
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