CN103313150A - Time-and wavelength-division multiplexed passive optical network transmission system based on directly modulated laser - Google Patents
Time-and wavelength-division multiplexed passive optical network transmission system based on directly modulated laser Download PDFInfo
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Abstract
The invention provides a time-and wavelength-division multiplexed passive optical network transmission system based on a directly modulated laser. The system comprises an optical circuit terminal, a feeder line type optical fiber and a passive optical network system; the passive optical network system comprises a remote end node, a distributive optical fiber and a plurality of optical network units; the optical circuit terminal is connected to the remote end node through the feeder line type optical fiber; and the remote end node is connected to each optical network unit through the distributed optical fiber. By completely using the directly modulated laser with tunable wavelength as the uplink and downlink high-output power emitter, the power estimation of the uplink and downlink transmission of the PON (passive optical network) system is improved, the cost of the uplink and downlink emitter is reduced, and the high-speed colorless emitter module of ONU (optical network unit) is realized with low cost; furthermore, as only one periodical filter is arranged at the optical network terminal for the chirp management of multiple uplink and downlink data signals, the tolerance of the system to dispersion of the optical fiber is improved and the transmission distance of the system is increased; in addition, the system is easy to implement and can be updated and rebuilt on the basis of the existing access network.
Description
Technical field
The present invention relates to the optical communication technique field, particularly, relate to a kind of passive light network transmission system of the hybrid wavelength-division and time-division multiplexing based on direct modulated laser.
Background technology
Development along with emerging service, such as passback of IPTV (IPTV), high definition TV (HDTV), large file-sharing, cloud storage/cloud computing, social networks, wireless data etc., the user is more and more higher to the demand of bandwidth, and presents the trend that increases progressively of per 3 years orders of magnitude.Therefore, in order further to improve the ability of access net system, satisfy the requirement of high bandwidth business development, realize the high power capacity of PON system, the transmission of large distance, FSAN has defined NG-PON2, and investigative technique is crossed over the novel PON system of property.Meanwhile, ITU/FSAN is in 2012 standards that take up to formulate NG-PON2, and determines that in April, 2012 EPON (TWDM-PON) of time division multiplexing and wavelength division multiplexing is the major programme of NG-PON2 standard.
The deployment of TWDM-PON system on the one hand can be according to the development need of network, and on the next-generation passive optical network of having built (XG-PON) and the infrastructure based on the access network of optical fiber, the XG-PON by the new wavelength that superposes realizes; Also can realize that full-service merges access by WDM-P2P extended base station carrying (Backhaul/Fronthaul), enterprise's access service etc. on the other hand.Therefore, current TWDM-PON system realizes because having that cost is low, compatible good, be easy to the advantages such as access that realize that full-service merges, can mate preferably with the developing goal of NG-PON2, becomes a focus of access net system research.In recent years, research institution both domestic and external is for the TWDM-PON system configuration, improving the system power budget, increases transmission range, realizing that effectively the aspect such as tunable transceiver done some researchs.
In practice, also there is following challenge in the development of TWDM-PON system: be two-forty non-colored light network element (ONU) problem on the one hand, and the adjustable transceiver problem of two-forty that namely how the low-cost ONU of realization holds; Moreover, improve the problem of system power budget; The problem of the dispersion tolerance of introducing along with the increase of up-downgoing speed, transmission range at last.Considering several technological challenges that TWDM-PON exists, is the real key that realizes low cost, two-forty, jumbo TWDM-PON system.At present, there have been many documents about the TWDM-PON system to be in the news.Although these documents provide certain technological guidance to the TWDM-PON System Development, also there are some unsolved problems simultaneously.
Through existing literature search is found, 2013, the people such as doctor Luo Yuanqiu of Huawei Tech Co., Ltd (Qiuyuan Luo) delivered the article that is entitled as " Time-and Wavelength-Division Multiplexed Passive Optical Network (TWDM-PON) for Next-Generation PON Stage2 (NG-PON2) " (as the EPON of the time-division wavelength division multiplexing of NG-PON2) at " IEEE Journal of Light wave Technology (lightwave technology magazine) ".In the document, the author has showed the TWDM-PON system of upper behavior a 4 * 2.5Gb/s (10-Gb/s) and lower behavior 4 * 10Gb/s(40-Gb/s).This structure is by OLT and the ONU transceiver module of stacking XG-PON system, come the realization system to share the framework of a light distributed network, satisfied the basic demand of the NG-PON2 that the ITU/FSAN tissue proposes, obtained the optical power budget of 38dB; Simultaneously, this structure can support that splitting ratio is the 20km monomode fiber transmission of 1:512, or supports that splitting ratio is the 40km monomode fiber transmission of 1:128 or support that splitting ratio is the 60km monomode fiber transmission of 1:64.Yet the upstream transmitter of ONU end adopts the DFB of thermal tuning wavelength only to realize single wavelength 2.5Gb/s upstream rate in this system configuration, and this speed can not adapt to and satisfy following new business access even Full-Services access service preferably to the requirement of bandwidth.Therefore, the upstream transmitter in a two-forty of ONU end administration is the inexorable trend of a TWDM-PON development.
For the colourless transmitter problem of the ONU that solves two-forty, find by literature search again, 2013, the M.M ü ller of the E.Wong of Univ Melbourne Australia and Munich, Germany polytechnical university and M.C.Amann etc. delivered the article that is entitled as " Colorless operation of short-cavity VCSELs in C-minus band for TWDM-PONs " (the colourlessization application based on the VCSELs of the C-band of short cavity in the TWDM-PONs system) in " Electronics Letters(electronics wall bulletin) ".The author has proposed to adopt the VCSELs(of the tuning short cavity of bias current to be operated in C-band in the document) wavelength, and then realize the colourlessization problem of the two-forty 10-Gb/s transmitter of ONU end.This colourless transmitter can also be realized the tuning range of 800GHz, the optical power budget of acquisition 28dB except the advantage of intrinsic low-power consumption own, can support that splitting ratio is the transmission of the 40km monomode fiber of 1:128.Yet this up tunable wave length is to realize by the bias current of modulating direct modulation VCSEL s, causes the ONU of different up wavelength to have different transmitting powers, thereby can bring the differentiation problem of the transmitter between the ONU.Simultaneously, because the utilizing emitted light power ratio of VCSELs itself is lower, the problem that the optical power budget in the time of will causing the large capacity access user of system is restricted.
Find by literature search again, 2011, the people such as P.P.Iannone are in the optical fiber communication meeting of Optical Fiber Communication Conference(state-owned enterprise, have delivered the article that is entitled as " Bi-Directionally Amplified Extended Reach40Gb/s CWDM-TDM PON with Burst-Mode Upstream Transmission " (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) on OFC).In the article, the author adopts 4 electricity to cause the Absorption modulation device as downstream transmitter at OLT, and 4 DFB that directly modulate have realized the TWDM-PON system of symmetrical 40-Gb/s as upstream transmitter.Yet, in order to expand the transmission range of TWDM-PON, increasing the power budget of system, the author proposes to dispose at distant-end node the semiconductor raman optical amplifier of a mixing.Because this amplifier is placed on distant-end node, destroy the structure of the light distributed network of the access net system of having built.This scheme can not realize smooth upgrade on the basis of existing Access Network, and the deployment of amplifier in the distant-end node, changes the sourceless characteristic of Access Network distributed network.
Summary of the invention
For defective of the prior art, the purpose of this invention is to provide a kind of low cost, high up-downgoing speed, high power budget, large transmission range, high dispersion tolerance based on the passive light network transmission system of straight key laser processed as the hybrid wavelength-division and time-division multiplexing of up-downgoing transmitter.This system's up-downgoing all adopt modulation rate at least the direct modulated laser of 10Gb/s as transmitter up and down.The wavelength of this laser has tunable characteristic, can satisfy the problem of the up colourless emission of ONU.Simultaneously, this system configuration does not change the structure of the light distributed network of original TDM-PON and XG-PON system, and is can be fully compatible mutually with existing PON system, is easy to upgrading on the basis of existing PON system; Simultaneously, for the laser that overcomes straight key system at a high speed warble with Transmission Fibers in dispersion interact and reduce the dispersion tolerance problem of PON system, this system proposes the one-period filter in OLT end administration, side by side realizes the chirp management of the direct modulated laser of uplink and downlink.In this system, on the one hand, be deployed in the periodic filter of OLT end, can be the direct modulation signal service of up-downgoing, this device cost can be shared by all users in the access net system simultaneously, can not bring the burden problem that causes user cost because of the interpolation of new parts; In addition, the transmission spectrum of periodic filter has periodically and the amphicheirality, not only can carry out simultaneously the chirp management of multiple signals, and the low noise that the trap characteristic in cycle can filtered signal and increase the raising of system signal noise ratio and then the system of realization receiving sensitivity; Moreover periodic filter is deployed in after the light wavelength division multiplexing of OLT and before the image intensifer, therefore the up-downgoing data-signal brings differential loss to be compensated by image intensifer because passing through periodic filter, therefore improved to a certain extent the power budget of system; At last, the realization of periodic filter itself is relatively simple, is easy to integratedly, can integrate with optical wavelength-division multiplex, therefore reduces to a certain extent the volume of system, is convenient to dispose.
According 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, comprise the optical line terminal that connects successively, branched system optical fiber, some passive optical networks, described passive optical network comprises 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 comprises the first media control module by the described optical line terminal in distribution type fiber-optic connecting optical network unit, light wavelength division multiplexing, periodic filter and image intensifer, light wavelength division multiplexing, periodic filter is connected with image intensifer and is connected, described optical line terminal also comprises a plurality of mainly by the downlink data signal transmitter module, the upstream data. signals receiver module, the first module that the first optical circulator consists of, described the first module is connected between the first media control module and the light wavelength division multiplexing; In described the first module, the first media control module is connected to 1 port of the first optical circulator by the 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 control module by the upstream data. signals receiver module.
Preferably, described distant-end node comprises light shunt/mixer, the coupling that described light shunt/mixer is mainly used in the distribution of downlink data signal and is modulated at the upstream data on the different wave length.
Preferably, described optical network unit comprises laser, the second optical circulator, optic tunable filter, photodetector, downlink data signal processing module, the second media control module of upstream data. signals source, up direct modulation, described upstream data. signals source drives described up direct modulated laser, the output of described up direct modulated laser is connected to 1 port of the second optical circulator, and upstream data. signals exports distribution type fiber-optic to realize the output of upstream data by 2 ports of the second optical circulator; 3 ports of the second optical circulator are connected to the downlink data signal processing module by described optic tunable filter, photodetector successively, and then finish the reception of downlink data, up direct modulated laser has the tunable wave length function, is used for realization with the Data Modulation different wave length of different optical nodes; The second media control module connects respectively the laser of optic tunable filter, downlink data signal processing module, up direct modulation.
Preferably, the downlink data signal transmitter module of the first different modules has different emission, and the standard of ITU-T is satisfied in the wavelength interval.
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 the up-downgoing data-signal should be the integral multiple of free spectrum intervals.
Preferably, described the first media control module is used for the data transmission situation of control up-downgoing data-signal.
Preferably, described periodic filter is mainly used in the chirp management of up-downgoing data-signal.
Preferably, up direct modulated laser has the tunable wave length function, is used for realization with the Data Modulation different wave length of different optical nodes.
Preferably, the second media control module is used for reception and the centre wavelength of control optic tunable filter and the time slot that downlink data signal receives of control optical node downlink data signal, simultaneously, the second media control module also is used for the modulation wavelength in control upstream data. signals source and the time slot that data transmit.
Preferably, described downlink data signal transmitter module comprises downlink data signal source, descending direct modulated laser, and wherein, descending direct modulated laser is the laser of the descending direct modulation of tunable wave length.
Preferably, the total length that light distribution type fiber-optic and branched system optical fiber are added up be several kms to scopes such as 100km, for example 20km, 40km, 60km, 80km or 100km.
More specifically, according to a kind of low cost provided by the invention, high performance hybrid wavelength-division and time-division multiplexing passive optical network system based on directly modulated lasers, comprise: optical line terminal, branched system optical fiber and some passive optical networks, passive optical network comprise 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 comprises the first media control 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: the media control module is used for controlling the data signal transmission situation (such as the wavelength of data modulation, the time slot of data transmission etc.) of up-downgoing, and the first media control module connects downlink data signal transmitter module and upstream data. signals receiver module; The downlink data signal transmitter module is connected to the first optical circulator, the 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 emission of downlink data; Upstream data connects image intensifer by feeder line optical fiber, image intensifer output connects periodic filter 2 ports, 1 port of periodic filter is connected to light wavelength division multiplexing, the output of light wavelength division multiplexing enters 2 ports of the first optical circulator, the first optical circulator 3 ports output connect the receiver module of upstream data.
Described downlink data signal transmitter module comprises downlink data source, descending direct modulated laser, and this descending direct modulated laser has the tunable wave length characteristic simultaneously, and its wavelength tuning characteristic can or be passed through Current Control by temperature control; Different downlink data signal transmitter modules has different emission simultaneously, and the standard of ITU-T need to be satisfied in the wavelength interval of different downlink data signal intermodules, can be 100GHz such as the wavelength interval, also can 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, the up-downgoing data-signal should be different wavestrips, wavelength interval between the simultaneously up-downgoing data-signal should be the integral multiple of the free spectrum intervals of periodic filter, namely in order side by side to realize chirp management, the 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 comprises optic tunable filter, the second optical circulator, photodetector, upstream data. signals source and up direct modulated laser and the second media control module, wherein: the light distribution type fiber-optic is connected to the 2nd port of the second optical circulator, and the 3rd port of the second optical circulator connects the detection that photodetector is realized downlink data signal after connecting optic tunable filter output; The output that the upstream data. signals source drives up direct modulated laser is connected to the 1st port of the second optical circulator, and 2nd port of the upstream data. signals of modulation by the second optical circulator connects the light distribution type fiber-optic and then realize the output of upstream data. signals; The second media control module mainly is by receiving descending control protocol, realizing the time slot of the descending receive data of control and time slot and the wavelength of wavelength and up transmitting data.
The light distant-end node is to be made of a 1:N light shunt/mixer, and the light distant-end node is between optical line terminal and optical network unit, and an end connects optical line terminal by branched system optical fiber, and the other end is by distribution type fiber-optic connecting optical network unit; It is mainly in order to be distributed to each optical network unit that is attached thereto with downlink data signal by distribution type fiber-optic, simultaneously, the upstream data. signals of the different wave length of different optical network units is coupled by mixer by distribution type fiber-optic, and the upstream data. signals after the coupling uploads to optical line terminal by branched system optical fiber and processes.
Described upstream transmitter, i.e. up direct modulated laser, it should have the function of tunable wave length, in order to realize colourlessization of optical network unit; The tunable wave length characteristic of this up direct modulated laser can be to realize it also can being to realize by electric current tuning by thermal tuning in addition.
The quantity of described downlink data signal transmitter module and downlink data signal receiver module is M, and M gets 4,8 or 16 etc., and concrete value is that the downstream rate according to PON system needs determines;
The quantity of described upstream data. signals transmitter module and upstream data. signals receiver module is L, L desirable 4,8 or 16 etc., and the value of L depends primarily on the upstream rate that the PON system needs; The tunable direct modulated laser of up wavelength requires it to have larger utilizing emitted light power and can improve up optical power budget.
Described upstream data. signals transmitter module mainly is to be made of upstream data. signals source and the tunable direct modulated laser of up wavelength.
The 1:N light shunt/mixer of described smooth distant-end node, wherein N is the quantity of the ONU in the EPON, N can get 64,128,256,512, the length of the Transmission Fibers in the number Main Basis system of its ONU of 1024().
Described smooth distribution type fiber-optic and branched system optical fiber, the total length that both add up its can be 20km, 40km, 60km, 80km or 100km, its laying length will consider according to the concrete needs of system and decide.
Compared with prior art, the present invention has following beneficial effect: the present invention is in the downstream transmitter module of TWDM-PON network system, adopt the direct modulated laser of tunable wave length, can improve the utilizing emitted light power of downstream transmitter, reduce the transmitter cost; Simultaneously, in order to overcome the shortcoming of warbling the dispersion tolerance in the transmission system being reduced of direct modulated laser, this system proposes to dispose the one-period filter at optical line terminal, this periodic filter not only can be managed the problem of warbling of up-downgoing transmitter simultaneously, and the cost of its device can be shared by all users in this network of access, in addition, periodic filter realizes simple, can be integrated in and reduce system complexity in the light wavelength division multiplexing; Moreover this system can continue to use already present optical fiber distributed type network and namely not change the distant-end node structure that has now in the access net system, can realize fully compatibility with existing EPON, is easy to upgrading on the basis of existing network; At the optical network unit end, adopt the direct modulated laser of tunable wave length as upper line light source, can to a certain degree reduce on the one hand the cost of non-colored light network element, on the other hand because the tunable wave length of laser can be realized the flexible access of ascending resource preferably.
Description of drawings
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 cheaply based on the structural representation of the passive light network transmission system of the hybrid wavelength-division and time-division multiplexing of direct modulated laser according to 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 by delay interferometer not;
Fig. 5 be periodic filter, upstream data. signals by with the spectral type curve by delay interferometer not;
Fig. 6 is direct modulation signal does not transmit the 50km standard single-mode fiber through periodic filter light eye pattern;
Fig. 7 is the light eye pattern after direct modulation signal transmission 50km standard single-mode fiber process periodic filter is carried out chirp management.
Embodiment
The present invention is described in detail below in conjunction with specific embodiment.Following examples will help those skilled in the art further to understand the present invention, but not limit in any form the present invention.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.
One aspect of the present invention takes full advantage of the direct modulated laser of tunable wave length as the high-output power transmitter of up-downgoing, improve the power budget of the up-downgoing transmission of PON system, reduce the cost of up-downgoing transmitter, realize the colourless transmitter module of high speed of ONU with lower cost; On the other hand, the present invention only disposes the one-period filter in Optical Network Terminal, is used for the chirp management of the direct modulating data of multichannel up-downgoing, has improved the tolerance to optical fiber dispersion of system, increase the system transmissions distance, and improved to a certain extent the optical power budget of system; At last, this system is easy to realize, can carry out upgrading on the basis of existing Access Network.
Particularly, as shown in Figure 1, in the present embodiment, comprise 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 links to each other with an end of branched system optical fiber, the other end remote node of the connection of branched system optical fiber, distant-end node is that (N gets 64 to 1:N light shunt/mixer, 128,256,512 or 1024, its occurrence need to consider transmission range in the system and the optical power budget of system), light shunt/mixer (Splitter) is by distribution type fiber-optic connecting optical network unit 1, optical network unit 2,, optical network unit N.Particularly, the N value depends on the along separate routes splitting ratio of mixer of light, and N desirable 64,128,256,512 or 1024.
Optical line terminal mainly is to be made of the first media control module, a M downlink data signal transmitter module, a L up NRZ data reception module, light wavelength division multiplexing, the first optical circulator, periodic filter, image intensifer.Wherein: M downlink data signal transmitter module is connected to the first optical circulator the 1st port, the 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 emission of downlink data signal; The data of up straight key system arrive optical line terminal and are connected to image intensifer, image intensifer connects the 2nd port of periodic filter, the 1st port of periodic filter is connected to light wavelength division multiplexing, be connected to 2 ports of the first optical circulator through light wavelength division multiplexing, be directly connected to the upstream data. signals receiver module by the 1st port of the first optical circulator.Concrete M and L value depend on downstream rate and the upstream rate in the PON system of upgrading, M desirable 4,8 or 16 etc., L desirable 4,8 or 16 etc.
Media control module in the optical line terminal is mainly used in controlling wavelength and the time slot that downlink data signal is modulated, and simultaneously regulation and control is implemented in the emission of upgoing O NU data.
Further, the upstream data. signals receiver module is that the normal optical electric explorer adds trans-impedance amplifier.The structure of downlink data signal transmitter module as shown in Figure 2, mainly the direct modulation Distributed Feedback Laser by downlink data signal source, tunable wave length forms.The free spectrum intervals of periodic filter is tunable.
Light shunt/the mixer of distant-end node is in order to be distributed to each optical network unit that is attached thereto with downlink data signal by distribution type fiber-optic; Simultaneously, the upstream data of the different wave length of different optical network units is coupled by mixer by distribution type fiber-optic, and the upstream data after the coupling uploads to optical line terminal by branched system optical fiber and processes.
Again as shown in Figure 1, any one optical network unit mainly is comprised of up direct modulated laser, the second media control module of the second optical circulator, optic tunable filter, photodetector, downlink data signal processing module, upstream data. signals source, tunable wave length.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, connect photodetector after the output of optic tunable filter, the output of photodetector is by being connected to the second media control module through the downlink data signal processing module, and then finishes the reception of the downlink data of this optical network unit; The upstream data. signals source drives up direct modulated laser, up direct modulated laser output is connected to the second optical circulator the 1st port, and the upstream data. signals of modulation enters the output of distribution type fiber-optic and then realization upstream data. signals by the 2nd port of the second optical circulator.
In optical network unit, up direct modulated laser has at least 10Gb/s Data Modulation ability, have simultaneously tunable wave length function (can be the tunable wave length of temperature controlled tunable wave length or Current Control) in order to realize colourlessization of optical network unit, can realize the Data Modulation different wave length with different ONU.The second media control module is used for the reception of control ONU downlink data signal, the time slot that the centre wavelength of major control optic tunable filter and downlink data signal receive; Simultaneously, this second media control module also is used for the emission wavelength of control upstream transmitter and the time slot that data transmit.
The periodic filter of optical line terminal is used for side by side managing warbling of up-downgoing data-signal.Through the feasibility of experimental verification this scheme, the spectral type curve of its periodic filter, through with the up-downgoing spectrogram of the direct modulation of not passing through periodic filter shown in Fig. 4,5.The free spectral range of the periodic filter among Fig. 4,5 is 25GHz.Fig. 6 and Fig. 7 have showed that direct modulated data signal does not have through this periodic filter with through the light eye pattern behind the optical fiber of periodic filter transmission 50km.As known in the figure, if after the upstream data. signals process Optical Fiber Transmission of chirp management, its poor-performing, the impossible situation that obtains zero error code.
In the present embodiment, adopt based on the up-downgoing transmission technology of the time-division wavelength division multiplexing of direct modulation and utilize periodic filter cheaply to realize simultaneously the chirp management of up-downgoing data-signal, have advantages of following:
1) the descending straight key laser processed of the descending employing tunable wave length of this architecture is as downstream transmitter, and the application of straight key laser processed increases the utilizing emitted light power of downlink data signal on the one hand, increases the power budget of system; Another aspect, this modulation device volume is little to be easy to integratedly, can reduce the Cost Problems of downstream transmitter.
2) the up direct modulated laser of optical network unit employing tunable wave length can better solve colourlessization of ONU problem as the upstream data. signals transmitter, and simultaneously, directly modulated laser uses the Cost Problems that can reduce optical network unit itself.
3) optical line terminal is only disposed the one-period filter, is used for the side by side chirp management of up-downgoing data-signal, and the new unit cost that the one side system increases can be shared by all users of access network; Moreover periodic filter is easy to realize, is convenient to integratedly, can integrate with the light wavelength division multiplexing of optical line terminal, reduces to a certain extent the size of device; In addition, periodic filter is deployed in before the image intensifer of optical line terminal, and the differential loss that is brought by this device can be compensated by image intensifer, has to a certain degree increased the power budget of system; The compensation of another aspect periodic filter has suppressed warbling of signal to a certain extent, has increased the resisting chromatic dispersion ability of system.
4) this architecture does not change the structure of the optical fiber distributed type network of the existing EPON of laying, and can continue to use the distant-end node structure in the existing PON system, thereby can carry out smooth upgrade in existing PON system, and complete and existing PON system compatible, and then can reduce to a certain extent the PON upgrade cost.
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 (11)
1. hybrid wavelength-division and time-division multiplexing passive light network transmission system based on directly modulated lasers, comprise the optical line terminal that connects successively, branched system optical fiber, some passive optical networks, described passive optical network comprises 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 is by distribution type fiber-optic connecting optical network unit, it is characterized in that, described optical line terminal comprises the first media control module, light wavelength division multiplexing, periodic filter and image intensifer, light wavelength division multiplexing, periodic filter is connected with image intensifer and is connected, described optical line terminal also comprises a plurality of mainly by the downlink data signal transmitter module, the upstream data. signals receiver module, the first module that the first optical circulator consists of, described the first module is connected between the first media control module and the light wavelength division multiplexing; In described the first module, the first media control module is connected to 1 port of the first optical circulator by the 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 control module by the upstream data. signals receiver module.
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 comprises light shunt/mixer, the coupling that described light shunt/mixer is mainly used in the distribution of downlink data signal and is modulated at the upstream data on the 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 comprises the upstream data. signals source, up direct modulated laser, the second optical circulator, optic tunable filter, photodetector, the downlink data signal processing module, the second media control module, described upstream data. signals source drives described up direct modulated laser, the output of described up direct modulated laser is connected to 1 port of the second optical circulator, and upstream data. signals exports distribution type fiber-optic to realize the output of upstream data by 2 ports of the second optical circulator; 3 ports of the second optical circulator are connected to the downlink data signal processing module by described optic tunable filter, photodetector successively, and then finish the reception of downlink data signal; The second media control module connects respectively optic tunable filter, downlink data signal processing module, up direct modulated laser.
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 the standard of ITU-T can be satisfied in the wavelength interval.
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 characterized in that, the transmission spectrum of described periodic filter is periodically, the free spectral range of periodic filter is tunable, and the wavelength interval between the up-downgoing data-signal should be the integral multiple of free spectrum intervals.
6. the hybrid wavelength-division and time-division multiplexing passive light network transmission system based on directly modulated lasers according to claim 1 is characterized in that, described the first media control module is used for the data transmission situation of control 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 1 is characterized in that, described periodic filter is mainly used in the chirp management of up-downgoing data-signal.
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, up direct modulated laser has the tunable wave length function, is used for realization with the Data Modulation different wave length of different optical nodes.
9. 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, the second media control module is used for reception and the centre wavelength of control optic tunable filter and the time slot that downlink data signal receives of control optical node downlink data signal, simultaneously, the second media control module also is used for the emission wavelength in control upstream data. signals source and the time slot that data transmit.
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 characterized in that, described downlink data signal transmitter module comprises downlink data signal source, descending direct modulated laser, wherein, the descending direct modulated laser laser that is the descending direct modulation of tunable wave length.
11. the hybrid wavelength-division and time-division multiplexing passive light network transmission system based on directly modulated lasers according to claim 1 is characterized in that, the total length that light distribution type fiber-optic and branched system optical fiber are added up is that several kms are to the scope of 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 |
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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 |
| CN105181154A (en) * | 2015-10-10 | 2015-12-23 | 中国工程物理研究院激光聚变研究中心 | Multi-beam broadband frequency modulation pulse laser waveform concentrated measuring apparatus |
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| 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 |
| CN108306685A (en) * | 2018-01-11 | 2018-07-20 | 青岛海信宽带多媒体技术有限公司 | Optical module and TWDM passive optical network |
| 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 |
| CN113596634A (en) * | 2021-07-30 | 2021-11-02 | 武汉光迅科技股份有限公司 | Combo PON OLT monolithic integrated chip and optical assembly thereof |
| 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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