CN103313150B - Hybrid wavelength-division and time-division multiplexing passive light network transmission system based on directly modulated lasers - Google Patents
Hybrid wavelength-division and time-division multiplexing passive light network transmission system based on directly modulated lasers Download PDFInfo
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Abstract
The invention provides the hybrid wavelength-division and time-division multiplexing passive light network transmission system based on directly modulated lasers, including optical line terminal, branched system optical fiber and passive optical network, passive optical network includes distant-end node, distribution type fiber-optic and optical network unit, optical line terminal is connected to distant-end node by branched system optical fiber, and distant-end node is connected to each optical network unit by distribution type fiber-optic.The present invention makes full use of the directly modulation laser instrument high-output power transmitter as up-downgoing of tunable wave length, improve the power budget of the downstream transmission of PON system, reducing the cost of up-downgoing transmitter, low cost realizes the colourless transmitter module of high speed of ONU；Additionally, the present invention only disposes a periodic filter at ONT Optical Network Terminal, for the chirp management of multichannel up-downgoing data signal, improve the tolerance to fibre-optical dispersion of system, add system transfers distance；This system is easily achieved, and can carry out upgrading on the basis of existing Access Network.
Description
Technical field
The present invention relates to technical field of photo communication, in particular it relates to the passive light network transmission system of a kind of hybrid wavelength-division and time-division multiplexing based on directly modulation laser instrument.
Background technology
Development along with emerging service, as IPTV (IPTV), high-definition television (HDTV), big file-sharing, cloud storage/cloud computing, social networks, wireless data passback etc., user is more and more higher to the demand of bandwidth, and presents the increasing trend of every 3 years orders of magnitude.Therefore, in order to improve the ability of access net system further, meet the requirement of high bandwidth business development, it is achieved the high power capacity of PON system, big distance transmission, FSAN defines NG-PON2, investigative technique cross over property novel PON system.Meanwhile, ITU/FSAN takes up to formulate the standard of NG-PON2 in 2012, and determines, in April, 2012, the major programme that the EPON (TWDM-PON) of time division multiplex and wavelength-division multiplex is NG-PON2 standard.
The deployment of TWDM-PON system, according to the development need of network, at the next-generation passive optical network (XG-PON) built with based on the infrastructure accessing network of optical fiber, can be realized by the XG-PON of the new wavelength of superposition on the one hand；Carry (Backhaul/Fronthaul), enterprise's access service etc. also by WDM-P2P extended base station on the other hand and realize full-service fusion access.Therefore, current TWDM-PON system because of have realize cost low, compatible good, be easily achieved the advantage such as access that full-service merges, can mate preferably with the developing goal of NG-PON2, become a focus of access net system research.In recent years, some researchs, for TWDM-PON system structure, have been done in improving system power budget, increase transmission range, realization tunable transceiver effectively etc. by research institution both domestic and external.
In practice, the development of TWDM-PON system there is also following challenge: is on the one hand two-forty non-colored light NE (ONU) problem, and namely how low cost realizes the adjustable transceiver problem of two-forty of ONU end；Furthermore, the problem improving system power budget；Finally, the problem of the dispersion tolerance introduced along with up-downgoing speed, the increase of transmission range.Consider the TWDM-PON several technological challenges existed, be the key really realizing low cost, two-forty, jumbo TWDM-PON system.At present, many documents about TWDM-PON system have been had to be in the news.Although TWDM-PON system development is provided certain technological guidance by these documents, but there is also some unsolved problems simultaneously.
Through existing literature search is found, 2013, doctor Luo Yuanqiu (QiuyuanLuo) of Huawei Tech Co., Ltd et al. delivered the article being entitled as " Time-andWavelength-DivisionMultiplexedPassiveOpticalNetw ork (TWDM-PON) forNext-GenerationPONStage2 (NG-PON2) " (EPON of time-division wavelength-division multiplex as NG-PON2) at " IEEEJournalofLightwaveTechnology (lightwave technology magazine) ".In the document, author illustrates a upper behavior 4 × 2.5Gb/s (10-Gb/s) and lower behavior 4 × 10Gb/s(40-Gb/s) TWDM-PON system.This structure is by OLT and the ONU transceiver module of stacking XG-PON system, and the system that realizes shares the framework of a light distributed network, meets the basic demand of the NG-PON2 that ITU/FSAN tissue proposes, it is thus achieved that the optical power budget of 38dB；Meanwhile, the 20km single-mode fiber transmission that this structure can support splitting ratio to be 1:512, or the 60km single-mode fiber transmission that the 40km single-mode fiber supporting splitting ratio to be 1:128 transmits or support splitting ratio is 1:64.But, in this system structure, the upstream transmitter of ONU end adopts the DFB of thermal tuning wavelength only to achieve Single wavelength 2.5Gb/s upstream rate, and this speed can not adapt to and meet following new business preferably and access the even Full-Services access service requirement to bandwidth.Therefore, the upstream transmitter in ONU end one two-forty of deployment is the inexorable trend of a TWDM-PON development.
The colourless transmitter problem of ONU in order to solve two-forty, find by literature search again, 2013, the E.Wong of Univ Melbourne Australia and M.M ü ller and the M.C.Amann of Munich, Germany polytechnical university etc. delivered, in " ElectronicsLetters(electronics bulletin) ", the article being entitled as " Colorlessoperationofshort-cavityVCSELsinC-minusbandforTW DM-PONs " (the decolorizable application of the VCSELs of the C-band based on short cavity in TWDM-PONs system).Author is in this document, it is proposed that adopt the VCSELs(of bias current tuning short cavity to be operated in C-band) wavelength, and then realize the decolorizable problem of the two-forty 10-Gb/s transmitter of ONU end.This colourless transmitter is except the advantage of inherently low-power consumption, it is also possible to realizes the tuning range of 800GHz, obtain the optical power budget of 28dB, it would be preferable to support splitting ratio is the transmission of the 40km single-mode fiber of 1:128.But, this upstream wavelength is tunable is realize by modulating the bias current of directly modulation VCSELs, causes that the ONU of different upstream wavelength has different transmitting powers, thus can bring the differentiation problem of transmitter between ONU.Simultaneously as the transmitting optical power ratio of VCSELs itself is relatively low, it will the problem that optical power budget when causing systems mass to access user is restricted.
Find by literature search again, 2011, P.P.Iannone et al. is at the fiber optic communication meeting of OpticalFiberCommunicationConference(state-owned enterprise, OFC) on delivered the article being entitled as " Bi-DirectionallyAmplifiedExtendedReach40Gb/sCWDM-TDMPONw ithBurst-ModeUpstreamTransmission " (passive optical network of the uplink burst pattern of the thick wavelength-division and time-division multiplexing of 40Gb/s of Bi-directional amplifier expanding transmission distance).In article, author adopts 4 electroluminescent Absorption modulation devices as downstream transmitter at OLT, and the DFB of 4 directly modulation is as upstream transmitter, it is achieved that the TWDM-PON system of symmetrical 40-Gb/s.But, in order to extend the transmission range of TWDM-PON, increasing the power budget of system, author proposes to dispose the quasiconductor raman optical amplifier of a mixing at distant-end node.Owing to this amplifier is placed on distant-end node, destroy the structure of the light distributed network of the access net system built.The program can not realize smooth upgrade and the deployment of amplifier in distant-end node on the basis of existing Access Network, changes the sourceless characteristic of Access Network distributed network.
Summary of the invention
For defect of the prior art, it is an object of the invention to provide a kind of low cost, high up-downgoing speed, high power budget, big transmission range, high dispersion tolerance based on the straight key laser instrument passive light network transmission system as the hybrid wavelength-division and time-division multiplexing of up-downgoing transmitter.This system up-downgoing all adopts the directly modulation laser instrument of modulation rate at least 10Gb/s as upper and lower transmitter.The wavelength of this laser instrument has tunable characteristic, it is possible to the problem meeting colourless transmitting up for ONU.Meanwhile, this system structure does not change the structure of the light distributed network of original TDM-PON and XG-PON system, it is possible to completely mutually compatible with existing PON system, it is easy to upgrading on the basis of existing PON system；Simultaneously, in order to overcome the dispersion tolerance problem with the dispersion interaction reduction PON system in Transmission Fibers of warbling of the laser instrument of straight key at a high speed, this system proposes to affix one's name to a periodic filter in OLT end, simultaneously realizes the chirp management of uplink and downlink directly modulation laser instrument.In this system, on the one hand, the periodic filter of OLT end it is deployed in, it is possible to service for up-downgoing directly modulation signal, this device cost can be shared by all users in access net system simultaneously, will not bring the burden problem causing user cost because of the interpolation of new parts；Additionally, the transmission spectrum of periodic filter has periodically and amphicheirality, be possible not only to carry out the chirp management of multiple signals simultaneously, and the trap characteristic in cycle can the low noise of filtered signal and increase system signal noise ratio and then realize the raising of system reception sensitivity；Furthermore, after the light wavelength division multiplexing that periodic filter is deployed in OLT and before image intensifer, therefore up-downgoing data signal is because bringing differential loss can be compensated by image intensifer through periodic filter, therefore improves the power budget of system to a certain extent；Finally, periodic filter itself realize relatively easy, it is easy to integrated, it is possible to integrate with OWDM, therefore reduce the volume of system to a certain extent, it is simple to dispose.
nullAccording to a kind of hybrid wavelength-division and time-division multiplexing passive light network transmission system based on directly modulated lasers provided by the invention，Including the optical line terminal being sequentially connected with、Branched system optical fiber、Some passive optical networks，Described passive optical network includes distant-end node、Some distribution type fiber-optics and some optical network units，Described optical line terminal is connected to described distant-end node by described branched system optical fiber，Described distant-end node includes the first media by optical line terminal described in distribution type fiber-optic connecting optical network unit and controls module、Light wavelength division multiplexing、Periodic filter and image intensifer，Light wavelength division multiplexing、Periodic filter and image intensifer are sequentially connected with，Described optical line terminal also includes multiple main by downlink data signal transmitter module、Upstream data. signals receiver module、The first module that first optical circulator is constituted，Described first module is connected to the first media and controls between module and light wavelength division multiplexing；In described first module, first media is controlled module and is connected to 1 port of the first optical circulator by downlink data signal transmitter module, 2 ports of optical circulator are connected to light wavelength division multiplexing, and 3 ports of optical circulator are connected to the first media by upstream data. signals receiver module and control module.
Preferably, described distant-end node includes light branch/combiner, the coupling of distribution that described smooth branch/combiner is mainly used in downlink data signal and the upstream data that is modulated on different wave length.
Preferably, described optical network unit includes upstream data. signals source, the laser instrument of up directly modulation, the second optical circulator, optic tunable filter, photodetector, downlink data signal processing module, the second media control module, described upstream data. signals source drives described up directly modulation laser instrument, the outfan of described up directly modulation laser instrument is connected to 1 port of the second optical circulator, and upstream data. signals is exported to distribution type fiber-optic by 2 ports of the second optical circulator to realize the output of upstream data；3 ports of the second optical circulator pass sequentially through described optic tunable filter, photodetector is connected to downlink data signal processing module, and then complete the reception of downlink data, up directly modulation laser instrument has tunable wave length function, for realizing the data modulation different wave length of different optical nodes；Second media controls module and connects the laser instrument of optic tunable filter, downlink data signal processing module, up directly modulation respectively.
Preferably, the downlink data signal transmitter module of the first different modules has different emission, and wavelength interval meets the standard of ITU-T.
Preferably, the transmission spectrum of described periodic filter is that periodically the free spectral range of periodic filter is tunable, and the wavelength interval between up-downgoing data signal should be the integral multiple of free spectrum intervals.
Preferably, described first media controls module for controlling the data transmitting situation of up-downgoing data signal.
Preferably, described periodic filter is mainly used in the chirp management of up-downgoing data signal.
Preferably, up directly modulation laser instrument has tunable wave length function, for realizing the data modulation different wave length of different optical nodes.
Preferably, second media controls module for controlling the reception of optical node downlink data signal and controlling the centre wavelength of optic tunable filter and the time slot of downlink data signal reception, meanwhile, the second media control module is additionally operable to the modulation wavelength in control upstream data. signals source and the time slot of data transmission.
Preferably, described downlink data signal transmitter module includes downlink data signal source, descending directly modulation laser instrument, and wherein, descending directly modulation laser instrument is the laser instrument of the descending directly modulation of tunable wave length.
Preferably, the total length that light distribution type fiber-optic and branched system optical fiber add up is a few km to scopes such as 100km, for instance 20km, 40km, 60km, 80km or 100km.
More specifically, according to a kind of low cost provided by the invention, the high performance hybrid wavelength-division and time-division multiplexing passive optical network system based on directly modulated lasers, including: optical line terminal, branched system optical fiber and some passive optical networks, passive optical network includes distant-end node, some distribution type fiber-optics and some optical network units.Optical line terminal is connected to distant-end node by branched system optical fiber, and distant-end node connects each optical network unit by distribution type fiber-optic, wherein:
Optical line terminal includes the first media and controls module, some downlink data signal transmitter modules, some upstream data receiver modules, the first optical circulator, light wavelength division multiplexing, periodic filter and image intensifer, wherein: media controls module and is used for controlling the data signal transmission situation (such as the time slot etc. that the wavelength of data modulation, data are launched) of up-downgoing, and the first media controls module and connects downlink data signal transmitter module and upstream data. signals receiver module；Downlink data signal transmitter module is connected to the first optical circulator, 2nd port output of the first optical circulator is connected to light wavelength division multiplexing, the output of light wavelength division multiplexing is connected to periodic filter, and the output of periodic filter 1 port connects image intensifer to realize the transmitting of downlink data；Upstream data connects image intensifer by feeder fiber, image intensifer output connects periodic filter 2 port, 1 port of periodic filter is connected to light wavelength division multiplexing, light wavelength division multiplexing output enter the first optical circulator 2 ports, the first optical circulator 3 ports output connect upstream datas receiver module.
Described downlink data signal transmitter module, including downlink data source, descending directly modulation laser instrument, this descending directly modulation laser instrument has tunable wave length characteristic simultaneously, and its wavelength tuning characteristic can be controlled by temperature or lead to excess current control；Simultaneously different downlink data signal transmitter modules has different emission, and the wavelength interval of different downlink data signal intermodules needs to meet the standard of ITU-T, and such as wavelength interval can be 100GHz, it is also possible to be 200GHz etc..
Described upstream data. signals receiver module, refers to by common photodetector.
Described periodic filter, is mainly used in the chirp management of up-downgoing data signal.In order to realize chirp management simultaneously, up-downgoing data signal should be different wavestrips, wavelength interval between up-downgoing data signal should be the integral multiple of the free spectrum intervals of periodic filter simultaneously, namely in order to simultaneously realize chirp management, up-downgoing data signal is positioned at the identical position (rising edge or trailing edge) of the spectral pattern of periodic filter；The free spectrum intervals of periodic filter is tunable.
Optical network unit includes optic tunable filter, the second optical circulator, photodetector, upstream data. signals source and up directly modulation laser instrument and the second media controls module, wherein: light distribution type fiber-optic is connected to the 2nd port of the second optical circulator, connect photodetector after the 3rd port connection optic tunable filter output of the second optical circulator and realize the detection of downlink data signal；Upstream data. signals source drives the output of up directly modulation laser instrument to be connected to the 1st port of the second optical circulator, and the upstream data. signals of modulation connects light distribution type fiber-optic by the 2nd port of the second optical circulator and then realizes the output of upstream data. signals；Second media controls module mainly by receiving descending control protocol, it is achieved control the time slot of downlink reception data and the time slot of wavelength and up transmitting data and wavelength.
Light distant-end node is to be made up of a 1:N light branch/combiner, and light distant-end node is between optical line terminal and optical network unit, and one end connects optical line terminal by branched system optical fiber, and the other end passes through distribution type fiber-optic connecting optical network unit；It mainly in order to be distributed to each optical network unit being attached thereto by downlink data signal by distribution type fiber-optic, simultaneously, the upstream data. signals of the different wave length of different optical network units being coupled by combiner by distribution type fiber-optic, the upstream data. signals after coupling uploads to optical line terminal by branched system optical fiber and processes.
Described upstream transmitter, i.e. up directly modulation laser instrument, it should have the function of tunable wave length, in order to realize the decolorizable of optical network unit；In addition the tunable wave length characteristic of this up directly modulation laser instrument, it is possible to be realize can also being realized by electric current tuning by thermal tuning.
Described downlink data signal transmitter module and the quantity of downlink data signal receiver module are M, M and take 4,8 or 16 etc., and concrete value is that the downstream rate needed according to PON system is determined；
Described upstream data. signals transmitter module and the quantity of upstream data. signals receiver module are L, L desirable 4,8 or 16 etc., and the value of L depends primarily on the upstream rate that PON system needs；The tunable directly modulation laser instrument of upstream wavelength, it is desirable to it has bigger transmitting luminous power can improve up optical power budget.
Described upstream data. signals transmitter module is mainly made up of upstream data. signals source and the tunable directly modulation laser instrument of upstream wavelength.
The 1:N light branch/combiner of described light distant-end node, wherein N is the quantity of the ONU in EPON, N can get 64,128,256,512, the length of Transmission Fibers in the number Main Basis system of its ONU of 1024().
Described light distribution type fiber-optic and branched system optical fiber, the total length that both adds up can be 20km, 40km, 60km, 80km or 100km, and its laying length to need to consider to determine according to the concrete of system.
Compared with prior art, the present invention has following beneficial effect: the present invention, in the downstream transmitter module of TWDM-PON network system, adopts the directly modulation laser instrument of tunable wave length, it is possible to improve the transmitting luminous power of downstream transmitter, reduces transmitter cost；Simultaneously, in order to overcome the shortcoming that the dispersion tolerance in transmission system is reduced of warbling of directly modulation laser instrument, this system proposes to dispose a periodic filter at optical line terminal, this periodic filter not only can manage the chirp problem of up-downgoing transmitter simultaneously, and the cost of its device can be shared by all users accessed in this network, additionally, periodic filter realizes simple, it is possible to be integrated in light wavelength division multiplexing and reduce system complexity；Furthermore, this system can be continued to use already present optical fiber distributed type network and namely not change the distant-end node structure in existing access net system, it is possible to realize completely compatible with existing EPON, it is easy to upgrading on the basis of existing network；At optical network unit end, adopt the directly modulation laser instrument of tunable wave length as upper line light source, can to a certain degree reduce the cost of non-colored light NE on the one hand, on the other hand owing to the wavelength tunability of laser instrument can realize the flexible access of ascending resource preferably.
Accompanying drawing explanation
By reading detailed description non-limiting example made with reference to the following drawings, the other features, objects and advantages of the present invention will become more apparent upon:
Fig. 1 is the structural representation of the passive light network transmission system of the hybrid wavelength-division and time-division multiplexing based on directly modulation laser instrument according to low cost provided by the invention；
Fig. 2 is the structure principle chart of the transmitter module of downlink data signal；
Fig. 3 is the structure principle chart of the receiver module of upstream data；
Fig. 4 be periodic filter, downlink data signal by with the spectral type curve not over delay interferometer；
Fig. 5 be periodic filter, upstream data. signals by with the spectral type curve not over delay interferometer；
Fig. 6 is that directly modulation signal transmits the light eye pattern of 50km standard single-mode fiber not past periodic filter；
Fig. 7 is that directly modulation signal transmission 50km standard single-mode fiber carries out the light eye pattern after chirp management through periodic filter.
Detailed description of the invention
Below in conjunction with specific embodiment, the present invention is described in detail.Following example will assist in those skilled in the art and are further appreciated by the present invention, but do not limit the present invention in any form.It should be pointed out that, to those skilled in the art, without departing from the inventive concept of the premise, it is also possible to make some deformation and improvement.These broadly fall into protection scope of the present invention.
One aspect of the present invention makes full use of the directly modulation laser instrument high-output power transmitter as up-downgoing of tunable wave length, improve the power budget of the downstream transmission of PON system, reduce the cost of up-downgoing transmitter, realize the colourless transmitter module of high speed of ONU with relatively low cost；On the other hand, the present invention only disposes a periodic filter at ONT Optical Network Terminal, for the chirp management of multichannel up-downgoing directly modulation data, improves the tolerance to fibre-optical dispersion of system, add system transfers distance, and improve the optical power budget of system to a certain extent；Finally, this system is easily achieved, and can carry out upgrading on the basis of existing Access Network.
Specifically, as shown in Figure 1, in the present embodiment, include according to the hybrid wavelength-division and time-division multiplexing passive light network transmission system based on directly modulated lasers provided by the invention: optical line terminal, branched system optical fiber, distribution type fiber-optic, distant-end node, optical network unit, wherein: described optical line terminal is connected with one end of branched system optical fiber, the other end remote node of the connection of branched system optical fiber, distant-end node is that 1:N light branch/(N takes 64 to combiner, 128, 256, 512 or 1024, its occurrence needs the optical power budget of transmission range and the system considering in system), light branch/combiner (Splitter) is by distribution type fiber-optic connecting optical network unit 1, optical network unit 2, ..., optical network unit N.Specifically, N value depends on the splitting ratio of light branch combiner, N desirable 64,128,256,512 or 1024.
Optical line terminal is mainly controlled module by the first media, M downlink data signal transmitter module, L up NRZ data reception module, light wavelength division multiplexing, the first optical circulator, periodic filter, image intensifer are constituted.Wherein: M downlink data signal transmitter module is connected to the first optical circulator the 1st port, 2nd port of the first optical circulator is connected to light wavelength division multiplexing, the output of light wavelength division multiplexing is connected to 1 port of periodic filter, and output 2 ports of periodic filter are connected to image intensifer and then realize the transmitting of downlink data signal；The data of up straight key arrive optical line terminal and are connected to image intensifer, image intensifer connects the 2nd port of periodic filter, 1st port of periodic filter is connected to light wavelength division multiplexing, it is connected to 2 ports of the first optical circulator through light wavelength division multiplexing, the 1st port of the first optical circulator is directly connected to upstream data. signals receiver module.Concrete M and L-value depend on the downstream rate in the PON system of upgrading and upstream rate, M desirable 4,8 or 16 etc., L desirable 4,8 or 16 etc..
Media in optical line terminal controls module, is mainly used in controlling wavelength and the time slot of downlink data signal modulation, the transmitting of upgoing O NU data is implemented regulation and control simultaneously.
Further, upstream data. signals receiver module is that normal light electric explorer adds trans-impedance amplifier.The structure of downlink data signal transmitter module is as in figure 2 it is shown, be mainly made up of the directly modulation Distributed Feedback Laser in downlink data signal source, tunable wave length.The free spectrum intervals of periodic filter is tunable.
Light branch/the combiner of distant-end node in order to be distributed to each optical network unit being attached thereto by downlink data signal by distribution type fiber-optic；Meanwhile, the upstream data of the different wave length of different optical network units is coupled by combiner by distribution type fiber-optic, and the upstream data after coupling uploads to optical line terminal by branched system optical fiber and processes.
Again as it is shown in figure 1, any one optical network unit is mainly controlled module formed by the second optical circulator, optic tunable filter, photodetector, downlink data signal processing module, upstream data. signals source, the up directly modulation laser instrument of tunable wave length, the second media.Wherein, one end of distribution type fiber-optic connects the 2nd port of the second optical circulator, the output of the 3rd port of the second optical circulator is connected to optic tunable filter, photodetector is connected after the output of optic tunable filter, the output of photodetector is connected to the second media control module by through downlink data signal processing module, and then completes the reception of the downlink data of this optical network unit；Upstream data. signals source drives up directly modulation laser instrument, the output of up directly modulation laser instrument is connected to the second optical circulator the 1st port, and the upstream data. signals of modulation enters distribution type fiber-optic by the 2nd port of the second optical circulator and then realizes the output of upstream data. signals.
In optical network unit, up directly modulation laser instrument has at least 10Gb/s data modulation could power, there is tunable wave length function (can be temperature controlled tunable wave length or the tunable wave length of electric current control) simultaneously in order to realize the decolorizable of optical network unit, it may be achieved by the data modulation different wave length of different ONU.Second media controls module for controlling the time slot that the reception of ONU downlink data signal, the centre wavelength of major control optic tunable filter and downlink data signal receive；Meanwhile, this second media control module is additionally operable to the transmitting wavelength of control upstream transmitter and the time slot of data transmission.
The periodic filter of optical line terminal is warbled for simultaneously management up-downgoing data signal.Through the feasibility of the experimental verification program, the spectral type curve of its periodic filter, through the up-downgoing spectrogram with the directly modulation not past periodic filter as shown in Figure 4,5.Fig. 4, periodic filter in 5 free spectral range be 25GHz.Fig. 6 and Fig. 7 illustrates directly modulation data signal not past this periodic filter and the light eye pattern after the optical fiber that periodic filter transmits 50km.If it can be seen that without the upstream data. signals of chirp management after fiber-optic transfer, its poor-performing, it is impossible to obtain the situation of zero error code.
In the present embodiment, adopt the downstream transmission technology of the time-division wavelength-division multiplex based on directly modulation and utilize the periodic filter of low cost to realize the chirp management of up-downgoing data signal simultaneously, having the advantage that
1) the descending straight key laser instrument of this architecture descending employing tunable wave length is as downstream transmitter, and the application of straight key laser instrument increases the transmitting luminous power of downlink data signal on the one hand, increases the power budget of system；Another aspect, modulation device volume is little is easily integrated for this, it is possible to decrease the Cost Problems of downstream transmitter.
2) optical network unit adopts the up directly modulation laser instrument of tunable wave length as upstream data. signals transmitter, it is possible to better solve the decolorizable problem of ONU, and meanwhile, directly modulation laser instrument uses the Cost Problems that can reduce optical network unit itself.
3) optical line terminal only disposes a periodic filter, and for the chirp management of simultaneously up-downgoing data signal, the new device cost that system increases on the one hand can be shared by all users accessing network；Furthermore, periodic filter is easily achieved, it is simple to integrated, it is possible to integrate with the light wavelength division multiplexing of optical line terminal, reduces the size of device to a certain extent；Additionally, before periodic filter is deployed in the image intensifer of optical line terminal, this device the differential loss brought can be compensated by image intensifer, to a certain degree adds the power budget of system；The compensation of another aspect periodic filter inhibits warbling of signal to a certain extent, adds the resisting chromatic dispersion ability of system.
4) this architecture does not change the structure of the optical fiber distributed type network of the EPON of existing laying, and the distant-end node structure in existing PON system can be continued to use, thus smooth upgrade can be carried out in existing PON system, and completely with existing PON system compatibility, and then PON upgrade cost can be reduced to a certain extent.
Above specific embodiments of the invention are described.It is to be appreciated that the invention is not limited in above-mentioned particular implementation, those skilled in the art can make various deformation or amendment within the scope of the claims, and this has no effect on the flesh and blood of the present invention.
Claims (10)
- null1. the hybrid wavelength-division and time-division multiplexing passive light network transmission system based on directly modulated lasers，Including the optical line terminal being sequentially connected with、Branched system optical fiber、Some passive optical networks，Described passive optical network includes distant-end node、Some distribution type fiber-optics and some optical network units，Described optical line terminal is connected to described distant-end node by described branched system optical fiber，Described distant-end node passes through distribution type fiber-optic connecting optical network unit，It is characterized in that，Described optical line terminal includes the first media and controls module、Light wavelength division multiplexing、Periodic filter and image intensifer，Light wavelength division multiplexing、Periodic filter and image intensifer are sequentially connected with，Described optical line terminal also includes multiple main by downlink data signal transmitter module、Upstream data. signals receiver module、The first module that first optical circulator is constituted，Described first module is connected to the first media and controls between module and light wavelength division multiplexing；First media is controlled module and is connected to 1 port of the first optical circulator by downlink data signal transmitter module, 2 ports of the first optical circulator are connected to light wavelength division multiplexing, and 3 ports of the first optical circulator are connected to the first media by upstream data. signals receiver module and control module；The transmission spectrum of described periodic filter is periodic, and the free spectral range of periodic filter is tunable, and the wavelength interval between up-downgoing data signal should be the integral multiple of free spectrum intervals.
- 2. the hybrid wavelength-division and time-division multiplexing passive light network transmission system based on directly modulated lasers according to claim 1, it is characterized in that, described distant-end node includes light branch/combiner, the coupling of distribution that described smooth branch/combiner is mainly used in downlink data signal and the upstream data that is modulated on different wave length.
- 3. the hybrid wavelength-division and time-division multiplexing passive light network transmission system based on directly modulated lasers according to claim 1, it is characterized in that, described optical network unit includes upstream data. signals source, up directly modulation laser instrument, second optical circulator, optic tunable filter, photodetector, downlink data signal processing module, second media controls module, described upstream data. signals source drives described up directly modulation laser instrument, the outfan of described up directly modulation laser instrument is connected to 1 port of the second optical circulator, upstream data. signals is exported to distribution type fiber-optic by 2 ports of the second optical circulator to realize the output of upstream data；3 ports of the second optical circulator pass sequentially through described optic tunable filter, photodetector is connected to downlink data signal processing module, and then complete the reception of downlink data signal；Second media controls module and connects optic tunable filter, downlink data signal processing module, up directly modulation laser instrument respectively.
- 4. the hybrid wavelength-division and time-division multiplexing passive light network transmission system based on directly modulated lasers according to claim 1, it is characterized in that, the downlink data signal transmitter module of the first different modules has different emission, and wavelength interval meets the standard of ITU-T.
- 5. the hybrid wavelength-division and time-division multiplexing passive light network transmission system based on directly modulated lasers according to claim 1, it is characterised in that described first media controls module and launches situation for the data controlling up-downgoing data signal.
- 6. the hybrid wavelength-division and time-division multiplexing passive light network transmission system based on directly modulated lasers according to claim 1, it is characterised in that described periodic filter is mainly used in the chirp management of up-downgoing data signal.
- 7. the hybrid wavelength-division and time-division multiplexing passive light network transmission system based on directly modulated lasers according to claim 3, it is characterized in that, up directly modulation laser instrument has tunable wave length function, modulates different wave length for the data realized different optical nodes.
- 8. the hybrid wavelength-division and time-division multiplexing passive light network transmission system based on directly modulated lasers according to claim 3, it is characterized in that, second media controls module for controlling the reception of optical node downlink data signal and controlling the centre wavelength of optic tunable filter and the time slot of downlink data signal reception, meanwhile, the second media control module is additionally operable to the transmitting wavelength in control upstream data. signals source and the time slot of data transmission.
- 9. the hybrid wavelength-division and time-division multiplexing passive light network transmission system based on directly modulated lasers according to claim 1, it is characterized in that, described downlink data signal transmitter module includes downlink data signal source, descending directly modulation laser instrument, wherein, descending directly modulation laser instrument is the laser instrument of the descending directly modulation of tunable wave length.
- 10. the hybrid wavelength-division and time-division multiplexing passive light network transmission system based on directly modulated lasers according to claim 1, it is characterised in that the total length that light distribution type fiber-optic and branched system optical fiber add up is a few km scope to 100km.
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| CN104936047A (en) * | 2015-06-08 | 2015-09-23 | 上海交通大学 | Uplink system of PON (Passive Optical Network) of filter based multicarrier modulation technology |
| CN105181154B (en) * | 2015-10-10 | 2018-04-10 | 中国工程物理研究院激光聚变研究中心 | A kind of multiple beam WBFM pulse laser waveform concentrates measurement apparatus |
| CN105471542A (en) * | 2015-12-24 | 2016-04-06 | 上海交通大学 | TWDMPON (time and wavelength division multiplexed passive optical network) uplink solution based on tunable wave length converter and wave length sharing method |
| CN105743600A (en) * | 2016-01-29 | 2016-07-06 | 烽火通信科技股份有限公司 | ONU (Optical Network Unit) in symmetrical TWDM-PON (Time and Wavelength Division Multiplexing-Passive Optical Network) system for realizing high speed transmission with low speed optical instrument |
| CN105743601A (en) * | 2016-01-29 | 2016-07-06 | 烽火通信科技股份有限公司 | Symmetrical TWDM-PON (Time and Wavelength Division Multiplexing Passive-Optical Network) system capable of realizing high-speed transmission through low-speed optical device |
| CN108306685B (en) * | 2018-01-11 | 2020-08-07 | 青岛海信宽带多媒体技术有限公司 | Optical module and TWDM passive optical network |
| CN113596634B (en) * | 2021-07-30 | 2023-09-26 | 武汉光迅科技股份有限公司 | Combo PON OLT monolithic integrated chip and optical component thereof |
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