CN103354625B - The passive light network transmission system of the stacking wavelength-division and time-division multiplexing based on OFDM - Google Patents
The passive light network transmission system of the stacking wavelength-division and time-division multiplexing based on OFDM Download PDFInfo
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Abstract
The invention provides a kind of passive light network transmission system of the stacking wavelength-division and time-division multiplexing based on OFDM, comprise: optical line terminal, branched system optical fiber and some passive optical networks, passive optical network comprises 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. The present invention utilizes OFDM technology to make downlink transmission data have higher resisting chromatic dispersion ability, improves the access capability of PON system, and has and be easy to upgrading on the basis of existing network, the advantage that system cost is cheap.
Description
Technical field
The present invention relates to optical communication technique neck, particularly, relate to a kind of stacking wavelength-division and time-division multiplexing based on OFDMPassive light network transmission system.
Background technology
Along with emerging in multitude of new business, some ultra high-definition HighDefinitionTelevision, HDTV TV, this localityWith global storage area network, large file-sharing, cloud storage/cloud computing, social networks etc., form generation bandwidth bottleneckThreaten, the symmetry of Access Network upstream and downstream bandwidth has been proposed to higher requirement. Therefore, existing EPON/GPON skillArt is all difficult to meet the ever-increasing demand of bandwidth. In order to improve system transmittability, meet wanting of high bandwidth business developmentAsk, realize the high power capacity of PON system, the transmission of large distance, IEEE and ITU-TFSAN have formulated XG-PON1(also claiming 10G-GPON) standard, and started to try commercial deployment. Meanwhile, in order to meet user more at a specified future date to bandWide demand, the begin one's study standard trend of NG-PON2 of 40Gb/s of industry. In May, 2011, FSAN tissueStart to propose explicitly calling for of NG-PON2.
Based on the architecture of time division multiplex and the stacking EPON (TWDM-PON) of wavelength-division multiplex, because of in factReady-made relatively low, compatibility good, and advantages such as (not changing existing ODN network structure) is considered to NG-PON2Main development direction. In recent years, research institution both domestic and external, for TWDM-PON systematic research, is mostly logicalCross and carry out on the basis of simple stacking several 10G-PON systems. But, at common TWDM-PONIn system, the greatly restriction system performance of dispersion of introducing along with the increase of up-downgoing speed, transmission range. WithTime, in TWDM-PON system, in order to realize the colorless ONU of high modulation speed, system cost is a weightWant problem.
OFDM OrthogonalFrequencyDivisionMultiple, OFDM draws it and has better opposing lookLoose and polarization mode dispersion ability is considered to the potential modulation of one and the multiplex mode in optical access network of future generation. CauseThis, is in order to overcome the chromatic dispersion problem in the passive optical network of two-forty, long Distance Transmission, can be by OFDM skillArt is introduced TWDM-PON system. At present, based on the stacking TWDM-PON system architecture pertinent literature of OFDMReport relatively less. About the report of the system architecture of TWDM-PON is all the OOK modulation system based on traditional.
Through existing literature search is found, the BangjiangLin of Peking University, the people such as JuhaoLi were published in 2012" PerformanceStudyof in Opto-ElectronicsandCommunicationsConference (OECC) meeting40-Gb/sOFDM-PONBasedonPolarizationInterleaving " (40-Gb/s's interweaving based on polarizationThe research of OFDM-PON systematic function). In the document, author has proposed a kind of palarization multiplexing interweavingOFDM-PON structure. In order to realize the modulation rate of down high speed, author appears for the first time different different Data ModulationsIn wavestrip, the OFDM data between different wavestrips are modulated at different polarization states simultaneously, and the data that modulate are passed throughAfter optical band pass filter by sideband of filtering and then form the ofdm signal that interweaves of polarization. At the ONU of this structure end,In order to detect downlink data, need the Digital Signal Processing of polarization receiver and corresponding multiple-input and multiple-output to separate different ripplesThe data of band and different polarization states. Although this structure can realize the transmission of descending 40-Gb/s, in this structure, OLTEnd needs the device of extra palarization multiplexing and radio frequency source to signal up-conversion, in ONU unit, need polarization demultiplexing device,The digital signal processing module of two photodetectors and corresponding multiple-input and multiple-output etc. is realized. Therefore, this structure phaseTo more complicated, the cost of ONU is relatively high, does not meet the needed low cost requirement of upgrading Access Network.
Find through retrieval again, the T.Duong in French Orange laboratory in 2007, the people such as N.Genay are in European optic communicationIn meeting (EuropeanConferenceandExhibitionsofOpticalCommunication, ECOC), deliver" LowcostMultiBand-OFDMforremotemodulationofcolorlessONUin hybridWDM/TDM-PONarchitecture " (mixing low cost multi-band OFDM in WDM/TDM-PON system is used for far awayThe colorless ONU of journey modulation). This article has mainly proposed a kind of colorless ONU structure based on the up remodulates of OFDM.In this structure, the OOK modulation system that descending employing is common, the remodulates of downstream signal is wiped in up employing based on SOAStructure, the OFDM mode of upward signal by adopting multi-band is by different the Data Modulation of different ONU wavestrips and then realExisting uplink. Although this system architecture adopts the lower line light source mechanism of reusing to overcome the problem of the colourless light source of ONU,That the distant-end node of system architecture adopts optical arrays waveguide optical grating to realize the closing of up/down row data/along separate routes. Waveguide array lightThe placement of grid will change the structure of the light distributed network of having laid in network system, the upgrading side of this and NG-PON2In case, clearly the direction of regulation adhesive does not conform to, therefore can not be as the scheme of NG-PON2. Meanwhile, articleAdopt OFDM is modulated in the different wavestrips of Same Wavelength, will produce larger in the uplink receiving process of OLT endThe interference of photo-beat audio-frequency noise, this interference is to suppress. Thereby this architecture is unfavorable for next-generation passive optical networkDilatation and upgrading.
Summary of the invention
For defect of the prior art, the object of this invention is to provide a kind of stacking Wave time division based on OFDMMultiplexing passive light network transmission system, this system descending adopts the stacking OFDM modulation system of several wavelength, canMake full use of resisting chromatic dispersion, spectrum efficiency advantages of higher that OFDM technology is brought; And distant-end node adopt light along separate routes/close roadDevice, this structure can not change the structure of the light distributed network of existing TDM-PON system, completely compatible and existingTDM-PON system, is easy to realize and upgrading; Upgoing O NU end adopts directly modulates Distributed Feedback Laser as sending outPenetrate machine, and the common OOK modulation system of up employing, can overcome preferably the impact of up photo-beat audio-frequency noise; ?ONU end, adopts same optical band pass filter to realize chirp management and the descending OFDM data of up directly modulated lasersSelection.
A kind of EPON of the stacking wavelength-division and time-division multiplexing based on OFDM is provided according to an aspect of the present invention,Transmission system, comprising: optical line terminal, branched system optical fiber and some passive optical networks, passive optical network bagDraw together distant-end node, some distribution type fiber-optics and some optical network units, optical line terminal is connected to far by branched system optical fiberEnd node, distant-end node connects each optical network unit by distribution type fiber-optic, it is characterized in that:
Optical line terminal comprises some descending OFDM data transmission modules, some up NRZ data reception modules,An array waveguide optical grating, the second array waveguide grating, the first optical circulator and EDFA Erbium-Doped Fiber Amplifier, wherein: descendingOFDM data transmission module is connected to the first array waveguide grating, and the output of the first array waveguide grating connects first ring of lightThe 1st port of shape device, the 2nd port of the first optical circulator connects EDFA Erbium-Doped Fiber Amplifier to realize the transmitting of downlink data;Up NRZ data reception module is connected with the second array waveguide grating, and the second array waveguide grating is connected to first ring of lightThe 3rd port of row device, the 2nd port of the first optical circulator connects EDFA Erbium-Doped Fiber Amplifier and realizes up NRZ dataReceive;
Optical network unit comprises optic tunable filter, optical circulator, photodetector, descending OFDM data-signal placeThe Distributed Feedback Laser of reason module, upstream data. signals and up direct modulation, one end of optic tunable filter connects the ring of lightThe 2nd port of row device, connects photodetector after the 3rd port output of optical circulator, and the input of photodetector connectsTo descending OFDM data-signal processing module, to complete the demodulation of downstream signal; Upstream data. signals drives directly and adjustsThe output of the Distributed Feedback Laser of system is connected to the 1st port of optical circulator, and upward signal is by the 2nd end of optical circulatorMouth enters optic tunable filter and then realizes the output of upstream data.
Preferably, descending OFDM data transmission module comprises: lower line light source DFB, Mach zehnder modulators and OFDMSignal generator module, Mach zehnder modulators is connected with lower line light source DFB and ofdm signal generation module respectively, itsIn: lower line light source DFB is for descending light carrier is connected to a Mach zehnder modulators, and ofdm signal generation module producesOfdm signal in raw electric territory to be to be used for driving a Mach zehnder modulators as Corticofugal Modulation of Somatosensory signal, by bias voltage,Make Mach zehnder modulators be operated in the linear zone of its transmission curve, and then realize the transmitting of descending OFDM data.
Preferably, optic tunable filter is for the pipe of warbling of the wavestrip selection of downstream signal and the upward signal of direct modulationReason, it makes the diverse location of uplink and downlink signals in same wave filter have certain wavelength interval, and downstream signal is logicalWave filter is positioned at the position of its centered carrier, and upward signal is positioned at rising edge or the trailing edge of the spectral pattern of optical filter.
Preferably, the Distributed Feedback Laser of up direct modulation is 10-Gb/sDFB laser instrument, and it has temperature-tunableFunction, in order to realize the decolorizable of optical network unit.
Preferably, distant-end node is 1:N light shunt/combiner, and it is in order to logical by the descending downstream signal based on OFDMCross distribution type fiber-optic and be distributed to each optical network unit being attached thereto; Meanwhile, the different wave length of different optical network unitsUp NRZ data are coupled by combiner by distribution type fiber-optic, and the upstream data after coupling is uploaded by branched system optical fiberProcess to optical line terminal.
Preferably, above-mentioned N gets 64,128,256 or 512.
Preferably, the quantity of descending OFDM data transmission module and up NRZ data reception module is M,M gets 4,8 or 10.
Preferably, lower line light source DFB is distributed feedback laser instrument DFB.
Preferably, up NRZ data reception module is photodetector.
Compared with prior art, the present invention has following beneficial effect: the present invention has changed common TWDM-PONDescending modulation and the multiplex technique of network system, utilize OFDM technology to make downlink transmission data have higher anti-lookLoose ability, the access capability of raising PON system; Meanwhile, this system can be continued to use already present optical fiber distributed type networkDo not change the distant-end node structure in existing access net system, can realize compatibility completely with existing EPON,Be easy to upgrading on the basis of existing network; At optical network unit end, the direct modulation of employing temperature-tunableDistributed Feedback Laser, as upper line light source, can to a certain degree reduce the cost of non-colored light NE, on the other hand on the one handBecause the temperature-tunable of Distributed Feedback Laser can be realized the flexible access of ascending resource preferably; Single tunable opticalWave filter can be simultaneously as the chirp management of downstream signal selection and upward signal, and making full use of resource can be to a certain degreeUpper saving system cost.
Brief description of the drawings
By reading the detailed description of non-limiting example being done with reference to the following drawings, other spy of the present inventionLevy, object and advantage will become more obvious:
Fig. 1 is the structural representation that the present invention is based on the passive light network transmission system of the stacking wavelength-division and time-division multiplexing of OFDMFigure;
Fig. 2 is the structure principle chart of the transmitter module of descending OFDM data;
Fig. 3 is that wave filter, uplink and downlink signals are by the spectral type curve of wave filter;
Fig. 4 is upward signal does not carry out chirp management signal eye diagram through optical filter;
Fig. 5 is the signal eye diagram of upward signal after optical filter carries out chirp management.
Detailed description of the invention
Below in conjunction with specific embodiment, the present invention is described in detail. Following examples will contribute to the technology people of this areaMember further understands the present invention, but does not limit in any form the present invention. It should be pointed out that the common skill to this areaArt personnel, without departing from the inventive concept of the premise, can also make some distortion and improvement. These all belong toProtection scope of the present invention.
As shown in Figure 1, the present embodiment comprises: optical line terminal, branched system optical fiber and some passive optical networks, nothingSource optical network system comprises distant-end node, some distribution type fiber-optics and some optical network units, wherein: described optical link eventuallyEnd is connected with one end of branched system optical fiber, the other end remote node of the connection of branched system optical fiber, and distant-end node is that 1:N light dividesRoad/combiner (N gets 64,128,256 or 512), light shunt/combiner (Splitter) connects by distribution type fiber-opticOptical network unit 1, optical network unit 2 ..., optical network unit N. Particularly, N value depends on that light closes road along separate routesThe splitting ratio of device, N desirable 64,128,256 or 512.
Optical line terminal mainly by M descending OFDM data transmission module, a M up NRZ data reception module,The first array waveguide grating, the second array waveguide grating, the first optical circulator, EDFA Erbium-Doped Fiber Amplifier form. Wherein: MThe output that individual descending OFDM data transmission module is connected to first array waveguide grating the first array waveguide grating connects theOne optical circulator the 1st port, the 2nd port of the first optical circulator connects EDFA Erbium-Doped Fiber Amplifier and then realizes downlink dataTransmitting; Up NRZ data arrive optical line terminal and are connected to EDFA Erbium-Doped Fiber Amplifier, the company of EDFA Erbium-Doped Fiber AmplifierConnect the 2nd port of the first optical circulator, the first optical circulator the 3rd port is connected to the second array waveguide grating, throughAfter two array waveguide gratings, be directly connected to up NRZ data reception module. Concrete M value depends on the PON of upgradingDownstream rate in system, M desirable 4,8 or 10.
Descending OFDM data transmission module produces M road (M=4 or 8 or 10) and is modulated at descending on different wave lengthSignal, after the first array waveguide grating, is input to feedback after being amplified by the first optical circulator by EDFA Erbium-Doped Fiber AmplifierLine formula optical fiber transmits; By each ONU(optical network unit) upstream data based on OOK modulation of transmitting viaThe first EDFA Erbium-Doped Fiber Amplifier, the first Optical circulator reach corresponding up NRZ after by the second array waveguide grating demultiplexingData reception module.
Further, up NRZ data reception module is photodetector. The knot of descending OFDM data transmission moduleStructure as shown in Figure 2, is mainly made up of lower line light source DFB, Mach zehnder modulators and ofdm signal generation module,Wherein: lower line light source DFB is distributed feedback laser instrument DFB, be connected to once moral modulation of Mach for descending light carrierDevice, ofdm signal generation module produce ofdm signal in electric territory as Corticofugal Modulation of Somatosensory signal for driving Mach onceMoral modulator, by bias voltage, makes Mach zehnder modulators be operated in the linear zone of its transmission curve, and then under realizingThe transmitting of row OFDM data.
Light shunt/the combiner of distant-end node is in order to distribute the descending downstream signal based on OFDM by distribution type fiber-opticGive each optical network unit being attached thereto; Meanwhile, the up NRZ data of the different wave length of different optical network units are logicalCross distribution type fiber-optic and be coupled by combiner, the upstream data after coupling uploads to optical line terminal by branched system optical fiber to carry outProcess.
Again as shown in Figure 1, arbitrary optical network unit mainly by optic tunable filter, optical circulator, photodetector, underThe Distributed Feedback Laser composition of row OFDM data-signal processing module, upstream data. signals, up direct modulation. Wherein,One end of optic tunable filter connects the 2nd port of optical circulator, connects photoelectricity and visit after the 3rd port output of optical circulatorSurvey device, photodetector be input to downlink data signal processing module, and then complete the demodulation of downstream signal; Upper line numberThe Distributed Feedback Laser of directly modulating according to signal driver, Distributed Feedback Laser output is connected to optical circulator the 1st port, upSignal enters optic tunable filter by the 2nd port of optical circulator and then realizes the output of upstream data.
Descending OFDM data reception module is made up of PD and OFDM demodulation module; Up Distributed Feedback Laser isThe Distributed Feedback Laser of 10-Gb/s, has the modulation function of tunable wave length function and the up NRZ data of temperature control, usesTo realize the decolorizable of optical network unit, can realize the Data Modulation different wave length of different ONU. Tunable optical filterThere is the selection of descending OFDM data-signal and the chirp management function of up straight tune NRZ data. Descending OFDM numberThe number of it is believed that realizes the choosing of downstream signal after arriving optical network unit by distribution type fiber-optic by tunable optical filterSelect, arrive descending OFDM data-signal receiver module via the second optical circulator, and then realize the detection of downstream signal.The Distributed Feedback Laser of having modulated upstream data arrives tunable optical filter by the second circulator, utilizes optical filter spectral patternRising edge or the warble video stretching that brings and then realize up chirp management of trailing edge filtering. Upper after wave filterRow data are input to distribution type fiber-optic and carry out uplink.
Optic tunable filter in optical network unit can be used for the wavestrip of downstream signal and selects and the direct upward signal of modulatingChirp management. Through the feasibility of experimental verification this scheme, the spectral type curve of its wave filter, device is descending after filteringOfdm signal spectrum, not after filtering the spectrum of the NRZ data of the up direct modulation of device, after filtering under deviceThe spectrum of the NRZ data of the up direct modulation behind edge falls, as shown in Figure 3. The 3dB of the adjustable filtering of light in Fig. 3Bandwidth is 100GHz. In this tunable optical filter, the wavelength of optimum between the uplink and downlink signal of same ONUInterval is 0.4nm. Fig. 4 has shown that the NRZ data-signal that up 10-Gb/s directly modulates does not pass through this optical filterEye pattern after the optical fiber of device transmission 25km after filtering. As known in the figure, if without the up letter of chirp managementNumber after optical fibre transmission, its poor-performing, can not obtain the situation of zero error code.
The present embodiment adopt the OFDM technology based on stacking time-division wavelength-division multiplex downlink transfer technology and time partial waveDivide multiplexing uplink technology, have advantages of following:
1) the descending employing of this architecture OFDM technology, system resisting chromatic dispersion when the transmission that can improve preferably down high speedAbility, and can make full use of the flexible flexible access capability of OFDM, realize descending multi-service elasticity access function.
2) this architecture does not change the structure of the optical fiber distributed type network of the EPON of existing laying, and can continue to useDistant-end node structure in existing PON system, thereby can carry out smooth upgrade in existing PON system, and completely andExisting PON system compatible, and then can reduce to a certain extent PON upgrade cost.
3) Distributed Feedback Laser of the direct modulation of optical network unit employing temperature-tunable, can as upward signal emitterBetter to solve the decolorizable problem of ONU, meanwhile, directly modulated laser uses and can reduce optical network unit itselfCost Problems.
4) optical network unit adopts single optical filter to realize selection and the up direct modulation of downstream signal wavestrip simultaneouslyThe chirp management of signal, can make full use of system resource, reduces to a certain extent the cost of optical network unit; Meanwhile, onThe diverse location of downstream signal in same wave filter have certain wavelength interval, thereby can avoid preferably because of upperLower signal brings the impact of backward Rayleigh scattering on systematic function.
Above specific embodiments of the invention are described. It will be appreciated that, the present invention is not limited toState specific implementations, those skilled in the art can make various distortion or amendment within the scope of the claims,This does not affect flesh and blood of the present invention.
Claims (9)
1. a passive light network transmission system for the stacking wavelength-division and time-division multiplexing based on OFDM, comprising: optical link eventuallyEnd, branched system optical fiber and some passive optical networks, described passive optical network comprises distant-end node, some distributionsFormula optical fiber 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 connects each optical network unit by distribution type fiber-optic, it is characterized in that:
Described optical line terminal comprise some descending OFDM data transmission modules, some up NRZ data reception modules,The first array waveguide grating, the second array waveguide grating, the first optical circulator and EDFA Erbium-Doped Fiber Amplifier, wherein, described inDescending OFDM data transmission module is connected to described the first array waveguide grating, described the first array waveguide grating defeatedGo out to connect the 1st port of the first optical circulator, the 2nd port of the first optical circulator connects EDFA Erbium-Doped Fiber Amplifier to realizeThe transmitting of downlink data; Described up NRZ data reception module is connected with described the second array waveguide grating, and describedTwo array waveguide gratings are connected to the 3rd port of described the first optical circulator, and the 2nd port of the first optical circulator connects to be mixedBait fiber amplifier is realized the reception of up NRZ data;
Described optical network unit comprises optic tunable filter, optical circulator, photodetector, descending OFDM data letterThe Distributed Feedback Laser of number processing module, upstream data. signals and up direct modulation, one end of described optic tunable filterConnect the 2nd port of optical circulator, after the 3rd port output of optical circulator, connect photodetector, photodetectorInput is connected to described descending OFDM data-signal processing module, to complete the demodulation of downstream signal; Upstream data letterNumber drive the directly output of the Distributed Feedback Laser of modulation to be connected to the 1st port of optical circulator, upward signal passes through the ring of lightThe 2nd port of row device enters optic tunable filter and then realizes the output of upstream data;
OFDM, refers to OFDM;
NRZ, refers to nonreturn to zero code;
DFB, refers to distributed feed-back.
2. the passive light network transmission system of the stacking wavelength-division and time-division multiplexing based on OFDM according to claim 1,It is characterized in that, described descending OFDM data transmission module comprises: lower line light source DFB, Mach zehnder modulators andOfdm signal generation module, described Mach zehnder modulators produces with described lower line light source DFB and ofdm signal respectivelyRaw module connects, wherein: described lower line light source DFB is used for descending light carrier to be connected to a Mach zehnder modulators,Ofdm signal generation module produce ofdm signal in electric territory using as Corticofugal Modulation of Somatosensory signal for driving described MachZehnder modulators, by bias voltage, makes described Mach zehnder modulators be operated in the linear zone of its transmission curve, and thenRealize the transmitting of descending OFDM data.
3. the passive light network transmission system of the stacking wavelength-division and time-division multiplexing based on OFDM according to claim 1,It is characterized in that, described optic tunable filter is warbled for the wavestrip selection of downstream signal and the upward signal of directly modulationManagement, it makes the diverse location of uplink and downlink signals in same wave filter have certain wavelength interval, i.e. downstream signalBe positioned at the position of its centered carrier by wave filter, upward signal is positioned at rising edge or the decline of the spectral pattern of optical filterEdge.
4. the passive light network transmission system of the stacking wavelength-division and time-division multiplexing based on OFDM according to claim 1,It is characterized in that, the Distributed Feedback Laser of described up direct modulation is 10-Gb/sDFB laser instrument, and it has temperature canTuber function, in order to realize the decolorizable of optical network unit.
5. the passive light network transmission system of the stacking wavelength-division and time-division multiplexing based on OFDM according to claim 1,It is characterized in that, described distant-end node is 1:N light shunt/combiner, and it is in order to by descending descending based on OFDMSignal is distributed to each optical network unit being attached thereto by distribution type fiber-optic; Meanwhile, the difference of different optical network unitsThe up NRZ data of wavelength are coupled by combiner by distribution type fiber-optic, and the upstream data after coupling is by branched system lightFibre uploads to optical line terminal and processes.
6. the passive light network transmission system of the stacking wavelength-division and time-division multiplexing based on OFDM according to claim 5,It is characterized in that, N gets 64,128,256 or 512.
7. the passive light network transmission system of the stacking wavelength-division and time-division multiplexing based on OFDM according to claim 1,It is characterized in that, the quantity of described descending OFDM data transmission module and up NRZ data reception module is M,M gets 4,8 or 10.
8. the passive light network transmission system of the stacking wavelength-division and time-division multiplexing based on OFDM according to claim 2,It is characterized in that, described lower line light source DFB is distributed feedback laser instrument DFB.
9. the passive light network transmission system of the stacking wavelength-division and time-division multiplexing based on OFDM according to claim 1,It is characterized in that, described up NRZ data reception module is photodetector.
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| CN104080018A (en) * | 2014-06-13 | 2014-10-01 | 上海交通大学 | TWDM-PON transmission system with load aggregating and energy-saving functions |
| CN104066019B (en) * | 2014-06-23 | 2017-11-14 | 上海交通大学 | The multistage beam-splitting structure system merged based on TWDM PON with wireless signal |
| CN104796376B (en) * | 2015-04-27 | 2019-04-23 | 杭州电子科技大学 | The passive optical network downlink transmission system of multi-carrier modulation based on wave filter group |
| 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 |
| CN105187128A (en) * | 2015-08-31 | 2015-12-23 | 武汉光迅科技股份有限公司 | 100G optical transceiver module with forward error correction function and based on direct modulation laser |
| CN105516831B (en) * | 2015-11-25 | 2019-04-23 | 杭州电子科技大学 | The Raman of optical access network based on microwave photon filtering inhibits system |
| CN105553559B (en) * | 2016-01-05 | 2018-11-30 | 烽火通信科技股份有限公司 | Long-distance passive optical network system and dispersion compensation method based on chirp grating |
| CN106788766B (en) * | 2016-12-02 | 2019-04-16 | 武汉邮电科学研究院 | A kind of OFDM-PON system based on on-off keying light modulation |
| CN110891206B (en) * | 2019-11-12 | 2022-02-08 | 南京邮电大学 | WDM-RoF-PON system based on optical frequency comb and polarization multiplexing |
| CN114339490B (en) * | 2021-12-30 | 2024-02-02 | 杭州电子科技大学 | PAM4 complement upgrade passive optical network based system and method |
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