CN102036134A - Converged optical access network system and method based on OFDM - Google Patents

Converged optical access network system and method based on OFDM Download PDF

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CN102036134A
CN102036134A CN2011100203799A CN201110020379A CN102036134A CN 102036134 A CN102036134 A CN 102036134A CN 2011100203799 A CN2011100203799 A CN 2011100203799A CN 201110020379 A CN201110020379 A CN 201110020379A CN 102036134 A CN102036134 A CN 102036134A
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signal
optical
carrier
frequency
ofdm
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忻向军
张丽佳
张琦
王拥军
刘博�
郝宇霆
关昕
陈雨露
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Beijing University of Posts and Telecommunications
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Beijing University of Posts and Telecommunications
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Abstract

The invention provides a convergent optical access network system and a method based on orthogonal frequency division multiplexing.A laser included in a module optical line terminal generates a basic optical carrier, a radio frequency modulation module and an optical differential filter are used for generating a millimeter wave optical carrier and a baseband optical carrier, then OFDM signals are respectively loaded, synthesized and output by a coupler and transmitted to an optical network unit through an optical distribution network; the optical network unit separates millimeter wave components from received signals, converts the millimeter wave components into electric signals and transmits the electric signals through the antenna group, and the rest signals are subjected to photoelectric conversion, digital-to-analog conversion and signal processing and further transmitted to the next-stage unit, so that the convergence access of wireless signals is realized. By adopting the model and the method, the wired signal and the wireless signal in the optical access network can be converged and accessed, and the baseband OFDM signal, the UWB (MB-OFDM) signal, the WiMax/WiFi signal, the millimeter wave OFDM signal and other modes can be accessed in the same scene, so that the universality of the access network is improved.

Description

Convergence type optical access network system and method based on OFDM
Technical field
Design of communications technology of the present invention, particularly a kind of convergence type optical access network system and method based on OFDM.
Background technology
Along with science and technology development, human society is just being marched toward informationalized epoch.Increasing information data need be propagated by network, and the application of various high flow capacities also emerges, for example IPTV, VoIP, video conference or the like.People are increasing for the demand of message transmission bandwidth always with surprising rapidity.And for Access Network, but still rest on the transmission rate of megabit magnitude, no matter be bandwidth or flexible aspect, all can not satisfy the develop rapidly of current network traffics and user's diversified demand, become a bottleneck in high-speed backbone and the local network.Following broadband access optical-fiber network not only will provide the access way of dynamic flexible for the user, and will improve spectrum efficiency, reduces transmission cost, satisfies the ever-increasing bandwidth demand of user.
At present widely used smooth access technology be the time division multiplexing EPON (Time DivisionMultiplexing-Passive Optical Network, TDM-PON).In this technology, local side apparatus is optical line terminal (Optical Line Terminal, OLT), remote equipment is a plurality of optical network units (Optical Network Unit, ONU), (OpticalDistribution Network ODN) connects the two by the Optical Distribution Network that has no chance.During data downstream, OLT transfers to each ONU with data in the mode of broadcasting by the mode of Time Division Multiplexing, and different ONU give up other data by the data of the own corresponding time slot of agreement acquisition; During data uplink, (by agreement in advance, in difference constantly, each ONU sends separately data respectively to OLT for TimeDivision Multiple Access, TDMA) mode then to adopt time division multiple access.Present commercial TDM-PON technology mainly is to follow the GPON technology of ITU-TG.984 standard, and the EPON technology of following the IEEE802.3ah standard.But the time division multiplexing mode during the TDM-PON up-downgoing has limited the bandwidth of unique user, causes problems such as the not enough and burst reception of band efficiency; Because each optical network unit ONU is different to the distance of optical line terminal OLT, the data that a plurality of ONU equipment send clash on the OLT receiver easily, must introduce ranging technology and burst control technology; Simultaneously, in order to guarantee that OLT can correctly receive the bursty data of ONU, also need to introduce and realize burst light receiving element that quick light detects and the burst clock and data recovery of recovered clock signal (BurstClock and Data Recovery, BCDR) device fast.When expanding more high bandwidth, implement very difficultly based on the burst reception technique of electricity, not only need to increase complicated Bandwidth Management algorithm, and, semiconductor and photoelectron industry have been proposed harsh requirement in clock synchronization, fast aspect the optical signal detecting.These problem restricted T DM-PON further develops, and is difficult to adapt to the evolution of network.
Wave division multiplexing passive optical network (Wavelength Division Multiplexing-PassiveOptical Network, WDM-PON) all distributed an independently wavelength for each ONU, can provide bigger bandwidth for each ONU, each ONU enjoys independently speed, compared to all ONU shared bits speed of TDM-PON, improved the fineness of network greatly.In addition, different ONU information are carried on the different wavelength, have largely increased the fail safe and the integration of network.A fly in the ointment of WDM-PON is that cost is higher, so from moving towards practicality distance is arranged still.
Over the past two years, (Orthogonal Frequency DivisionMultiplexing, the OFDM) appearance of technology was for new vitality had been injected in optical communication to the OFDM in light territory.It is that the OFDM technology in the radio communication is referred on the light that light positive is handed over frequency multiplexing technique, the bit information of high speed serialization is assigned on the overlapped subcarrier of each frequency spectrum dynamically, each subcarrier adopts senior modulation formats such as QAM, the spectrum efficiency of elevator system effectively simultaneously.What is more important, the data-signal duration of light OFDM symbol on each subcarrier increases relatively, add the employing of Cyclic Prefix technology, thereby effectively overcome the intersymbol interference that chromatic dispersion in the optical fiber link and the chromatic dispersion of sheet vibrating diaphragm are brought.In addition, OFDM is a requisite technology in the radio communication.If adopt OFDM form carrying light signal, can realize that optical fiber inserts and the seamless fusion of wireless access.
OFDM can effectively improve the spectrum efficiency of optical access network.Because the orthogonality between each subcarrier of light ofdm signal, it not only allows the frequency spectrum of each subchannel to overlap mutually, and can realize the contour contrast system of xQAM, xPSK on each subcarrier by simple constellation mapping algorithm.Therefore, compare, light OFDM technology is applied in the optical access network can utilizes frequency spectrum resource to greatest extent, promote spectrum efficiency with other modes.
Simultaneously, the resisting chromatic dispersion that light OFDM technology is good makes optical access network to growing apart from the Access Network smooth evolution.Length greater than 80 kms is nearly 2 a years research focus apart from Access Network, is that the metropolitan area Access Network inserts the product that merges mutually with EPON, and it can effectively simplify network configuration, promotes network performance, reduces network cost.Insert for long distance, link dispersion is to the primary beyond doubt problem that solves of the influence of system.And theoretically, the light ofdm signal is not subjected to the chromatic dispersion in the link and the influence of polarization mode dispersion fully.Can realize that optical access network is to long seamlessly transitting apart from Access Network so adopt OFDM to insert.
As everyone knows, Optical Access Network has huge bandwidth potential and good QoS performance, but does not possess mobility, can't satisfy the diversified demand of user terminal; Wireless access network has higher flexibility ratio and mobility, but the QoS poor-performing.OFDM is widely used in WiMax/WiFi and UWB (Ultra-Wide Band, the ultra broadband) framework as the mature technology in the radio communication.If the two fusion, by appropriate design, integrate both advantages, may realize both having had the good QoS of Optical Access Network, can transmit the integrated system of millimeter-wave signal again.
In order to realize this imagination, we have designed the convergence type optical access network system based on OFDM.This system just is based on the basis of OFDM Optical Access Network, the integrated radio-frequency module of millimeter wave frequency band, method by the radio frequency cutting, and make use up between difference multiplexer (Inter Leaver, IL), in a system, produce millimeter wave light carrier and fundamental frequency light carrier simultaneously, be coupled as the single channel mixed signal after the modulation respectively, between optical line terminal and optical network unit, form mixed signal stream, grow Distance Transmission by optical fiber.Reusing between light the difference multiplexer at far-end at last separates with wireless signal wired.So just realize the access of converging of wire signal and wireless signal.
Fig. 1 is common millimeter wave transmission system.Now, common millimeter wave transmission system is described in conjunction with Fig. 1, specific as follows:
LASER Light Source 10 is used for producing millimeter wave at the needed light carrier of optical fiber transmission; Millimeter wave electricity territory signal source 11 produces the electric territory signal of the millimeter wave that has modulated; Light carrier and millimeter wave electricity territory signal are all imported into MZ modulator 12; MZ modulator 12 is divided into two bundles with the light carrier that receives and propagates on two waveguide arms in modulator respectively, utilize the information in the signal of millimeter wave electricity territory to change the modulation voltage of two waveguide arms in the modulator then to change the refractive index of waveguide, change close down phase difference between the two-beam of output of two ripples, the millimeter glistening light of waves that output has mixed up carries signal.
Light carries signal and is set out by local side, grows the transmission of distance by optical fiber, transfers to the high-speed photodetector 13 of millimeter-wave signal transmitting terminal.
The millimeter glistening light of waves that high-speed photodetector 13 will receive carries signal and carries out opto-electronic conversion, is reduced into millimeter wave electricity territory signal, imports Anneta module 14 into; Anneta module 14 is launched millimeter wave electricity territory signal by antenna.
Fig. 2 is common OFDM optical access network system.Now in conjunction with Fig. 2, the structure of common OFDM optical access network system is described, specific as follows:
Common OFDM access network system comprises: optical line terminal, Optical Distribution Network, a L optical network unit.L is greater than or equal to 1 integer.
Optical line terminal 20 is used to produce light carrier, and the information that needs are carried is loaded on the light carrier in the OFDM mode, and the OFDM light signal after output loads is to Optical Distribution Network 21.Wherein, optical line terminal 20 comprises LASER Light Source 200, OFDM module 201, and MZ modulator 202.LASER Light Source 200 produces a unifrequency laser, and as the needed light carrier of light ofdm signal, this light carrier is access in to two waveguide arms of MZ modulator 202.Comprise required data source in the OFDM module 201, this module is carried out the OFDM conversion with data, exports the ofdm signal in electric territory, and outputs to MZ modulator 202 and change the refractive index of two waveguide arms as modulation voltage, thereby changes phase difference.The signal of MZ modulator 202 outputs is the light ofdm signal.
Optical Distribution Network 21 is assigned to the ofdm signal of light local side output in L the optical network unit 22 of far-end.Wherein, L is the integer more than or equal to 1.
Optical network unit 22 is used to receive the light ofdm signal, and changes, is processed into the data of the required signal of telecommunication.Wherein, optical network unit 22 comprises that high-speed photodetector 220, A/D converter 221, signal processing unit 222 high-speed photodetectors receive the light OFDM that Optical Distribution Network 21 transmits, and utilize photoelectric effect to convert the ofdm signal in electric territory to; A/D converter 221 should carry out analog-to-digital conversion by electricity territory signal, become baseband digital signal; 222 of signal processing units convert the OFDM digital signal in the optical line terminal 20 data source signal in the OFDM module 201.
Above-mentioned common millimeter wave transmission system and common OFDM insert optical network system and have finished the long Distance Transmission of millimeter wave in fibre system and the transfer of data of light OFDM form respectively.But when two kinds of systems need use on same circuit, then must set up two cover systems, transmit light respectively and carry millimeter wave and light OFDM formatted data, the complexity that this had both increased the system synthesis management has also increased fund costs such as optical fibre installation, the device space.In order to make full use of the transmission bandwidth potentiality of optical fiber, two Optical Fiber Transmission are fused to the single fiber transmission can overcome above-mentioned weakness.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of convergence type optical access network system based on OFDM, this system can be implemented in the Same Scene, multiple modes such as baseband OFDM signal, UWB (MB-OFDM) signal, WiMax/WiFi signal and millimeter wave ofdm signal insert, and increase the universality of Access Network.
Another object of the present invention is to provide a kind of convergence type optical access network method based on OFDM, this method can be implemented in the Same Scene, multiple modes such as baseband OFDM signal, UWB (MB-OFDM) signal, WiMax/WiFi signal and millimeter wave ofdm signal insert, and increase the universality of Access Network.
In order to achieve the above object, technical scheme of the present invention is such:
Should comprise three parts based on the convergence type optical access network system of OFDM: optical line terminal, Optical Distribution Network, a N optical network unit.
Produce the light source light wave by the LASER Light Source in the optical line terminal, after of the radio frequency cutting of MZ modulator, form the multicarrier of a plurality of frequency contents with radiofrequency signal; Multicarrier is differed from multiplexer subsequently by frequency separation between light, obtain independently base band light carrier and millimeter wave light carrier two paths of signals, need the ofdm signal by millimeter wave and baseband transmission respectively in the modulation, be coupled by coupler then, the acquisition mixed signal also sends.
Mixed signal after optical line terminal will be coupled is transferred to N optical network unit; Wherein N is the integer more than or equal to 1.
In optical network unit one side, multiplexer carries signal according to different frequency with the millimeter glistening light of waves and base band light carries Signal Separation by differing between light again; The millimeter glistening light of waves carries that signal is converted into the signal of telecommunication and via antenna transmission; Base band light carries signal and is converted into the signal of telecommunication, and the entering signal processing unit is handled then, isolates WiMax/WiFi signal, UWB signal, base band data etc., again with it by antenna emission or be transferred to next step application.
Innovation part of the present invention the access net system that provided and method is provided plurality of access modes such as UWB, millimeter wave, WiMax/WiFi, base band are converged is one, the unified OFDM technology beared information that adopts on the physical layer, plurality of access modes is discerned, survey and handle, realize that the seamless light that converges inserts.
As seen from the above technical solutions, the invention provides a kind of convergence type optical access network system and method based on OFDM.The advantage of scheme is again, and being used in combination of difference multiplexer and rf modulations module between the light in the optical line terminal makes the millimeter glistening light of waves carry the generation that signal and base band light carries signal and be positioned on the same optical line terminal, is convenient to the buying and the installation administration of equipment; Only need a LASER Light Source at local side, reduce equipment cost; Millimeter-wave signal and light ofdm signal be by the transmission of same Optical Distribution Network, saved the material of optical fiber wiring and manpower equipment, cost, simplified the complexity of Optical Distribution Network; Improved the band efficiency of fibre system; Add difference multiplexer between light inlet at the light allocation units of far-end, two systems that realize integrated at far-end, the installation of being convenient to system is disposed; Select plurality of access modes such as baseband OFDM signal, UWB signal, WiMax/WiFi signal and millimeter wave ofdm signal at different scenes flexibly, satisfied the diversified demand of optical access network terminal, and increased the universality of Access Network largely.
Description of drawings
The common millimeter wave transmission system of Fig. 1.
The common OFDM optical access network system of Fig. 2.
Fig. 3 is the structural representation that the present invention is based on the convergence type optical access network system of OFDM.
Fig. 4 is the structural representation of OFDM module in the system of the present invention.
Fig. 5 is the flow chart that the present invention is based on the convergence type optical access network method of OFDM.
Embodiment
For make purpose of the present invention, technical scheme, and advantage clearer, below with reference to the accompanying drawing embodiment that develops simultaneously, the present invention is described in more detail.
The invention provides a kind of convergence type optical access network system and method based on OFDM, the laser that this mould optical line terminal comprises produces basic light carrier, the difference filter generates millimeter wave light carrier and base band light carrier between utilization rf modulations module and light, load ofdm signal subsequently respectively, utilize coupler with its synthetic output, transfer to optical network unit by Optical Distribution Network; Optical network unit goes out the millimeter wave composition with the Signal Separation that receives, and launches by antenna sets, and remaining signal carries out digital-to-analogue conversion and signal processing, further is transferred to the next stage unit, thereby realizes the access of converging of wireless signal.
Fig. 3 is the structural representation that the present invention is based on the convergence type optical access network system of OFDM; Fig. 4 is the structural representation of OFDM module in the system of the present invention.Now in conjunction with Fig. 3 and Fig. 4, the structure of the convergence type optical access network system that the present invention is based on OFDM is described, specific as follows:
For sake of clarity, earlier the convergence type optical access network system that the present invention is based on OFDM is defined, access net system of the present invention can produce that a millimeter glistening light of waves carries signal and base band light carries signal simultaneously at optical line terminal, and rationally mix, transfer to optical line terminal by Optical Distribution Network, isolate a millimeter glistening light of waves and carry signal in terminal, and launch by antenna, base band light carries signal and then enters correlation module and carry out digital processing; The present invention's OFDM module shown in Figure 4 can realize the OFDM code conversion of data flow, by steps such as IFFT conversion, digital-to-analogue conversions, exports data to the MZ modulator at last, is used for light carrier is modulated.
The convergence type optical access network system that the present invention is based on OFDM comprises: optical line terminal 30, Optical Distribution Network 31 and N optical network unit 32.
Wherein, optical line terminal 30 comprises difference multiplexer 303 and coupler 408 between 300,2 OFDM modulation modules of LASER Light Source (Fig. 3 is not shown), 1 rf modulations module (Fig. 3 is not shown), light.
LASER Light Source 300 in the optical line terminal 30 and the signal between the rf modulations module are the light source light wave, are the light carrier primary light sources of whole system; Produce the radiofrequency signal of millimere-wave band in the rf modulations module, subsequently with this signal by in the MZ modulator 301 the light source light wave being carried out radio frequency cutting, the multi-carrier signal that formation has a plurality of frequency contents; After difference multiplexer 303 received multi-carrier signal between light, it carries out frequency separation handled, and produces millimeter wave light carrier and base band light carrier two paths of signals; The frequency of described base band light carrier has identical light frequency with the light source light wave; Wherein the frequency of base band light carrier has identical light frequency with the light source light wave, and the millimeter wave light carrier is the signal with two frequencies, and the difference of two frequencies is exactly the frequency values of millimeter wave carrier, and these two frequencies are symmetrically distributed in the both sides of base band optical carrier frequency; One of OFDM modulation module (being made up of MZ modulator 304 and OFDM module 305) carries out OFDM to the data of millimeter wave data source to be handled, generation need be by the ofdm signal of millimeter wave transmission, this signal is loaded on the millimeter wave light carrier in the MZ modulator subsequently, and the millimeter glistening light of waves that forms required transmission carries signal; Two (being made up of MZ modulator 306 and OFDM module 307) of OFDM modulation module the data of an other data source being carried out OFDM handles, the needs that produce are by the ofdm signal of light baseband transmission, this signal subsequently in the MZ modulator north be loaded on the base band light carrier, form the required base band light of transmission and carry signal; Coupler 308 carries signal and base band light with the millimeter glistening light of waves and carries signal two-way independent light signal and be coupled, and forms the nonoverlapping mixed signal of frequency, and exports it to link fiber, is linked into Optical Distribution Network 31.
Optical Distribution Network 31 receives the signal of the optical line terminal that is positioned at local side, and passes to N the optical network unit 32 that is positioned at far-end; Optical Distribution Network 31 is limiting structure not, and its structure can be star-like, bus-type, annular, existing structure such as point-to-point, also can be the following new construction that occurs.Present invention focuses on the convergence type optical access network system and the method based on OFDM of optical line terminal 30 and optical network unit 32; The structure of N optical network unit 32 is identical; N is the positive integer more than or equal to 1.
Comprise difference 320,2 high-speed photodetectors of filter (321 and 324), 1 322,3 antenna of Anneta module (323,327,328), 325,1 signal processing units 326 of 1 A/D converter between 1 light in each optical network unit unit 32.
After difference filter 320 receives the mixed signal that Optical Distribution Network 31 transmits between light, by signal being carried out the staggered separation of frequency, obtain independently that a millimeter glistening light of waves carries signal with base band light carries signal, common two-way; One of high-speed photodetector 321 carries conversion of signals with the millimeter glistening light of waves and becomes millimeter wave electricity territory signal; Millimeter wave electricity territory signal is handled by Anneta module 322, and carries out wireless transmission by one of antenna 323; Two of high-speed photodetector 324 converts isolated base band optical carrier to base band electricity territory signal; A/D converter 325 becomes digital signal with base band electricity territory conversion of signals; 326 pairs of digital signals of signal processing unit are handled, and isolate WiMax/WiFi signal, UWB signal, base band data; 2 327 of antenna sends the WiMax/WiFi signal; 3 328 of antenna sends the UWB signal; Base band data is output for other application.
Wherein, two OFDM modulation modules respectively comprise a MZ modulator and an OFDM module.The rf modulations module comprises MZ modulator 301 and radio-frequency signal generator 302.Wherein, MZ modulator 304 and OFDM module 305 are formed one of OFDM modulation module, finish the modulation that millimeter glistening light of waves carries signal; MZ modulator 306 and OFDM module 307 are formed two of OFDM modulation module, finish the modulation that base band light carries signal.
The MZ modulator is divided into two bundles with the light carrier that receives and propagates on two waveguide arms in modulator respectively, utilize the information that contains in photoelectric effect and the traffic spike to change the modulation voltage of two waveguide arms in the modulator then to change the refractive index of waveguide, change close down phase difference between the two-beam of output of two ripples, the signal that output has mixed up.If the MZ modulator is positioned at the OFDM modulation module, then flows of data signals refers to ofdm signal, and output signal carries signal for the millimeter glistening light of waves or base band light carries signal; If the MZ modulator is positioned at the rf modulations module, then flows of data signals refers to the millimeter-wave frequency carrier signal that radio-frequency signal generator produces, and output signal is a multi-carrier signal.
Radio-frequency signal generator produces the sine wave in an electric territory, and this sine wave is used as the carrier wave of millimeter-wave signal.Therefore, the frequency of sinusoidal signal should be a millimeter scope to satisfy wavelength at 30GHz-300GHz.
The structure of OFDM module comprises as shown in Figure 4 with lower member: data source 40, serial to parallel conversion module 41, digital signal processing module 42, parallel serial conversion module 43, two D/A converter modules 44 and software up-conversion modules 45.
Data source 40 produces the signal that needs transmission;
Serial to parallel conversion module 41 is converted to the M channel parallel data with one tunnel serial data;
Digital signal processing module 42 carries out inverse fast fourier transform (IFFT) with M road serial signal, promptly the M circuit-switched data is modulated on the different orthogonal sub-carriers; In the ofdm signal that forms, add Cyclic Prefix subsequently, expand the intersymbol interference that causes in order to the multidiameter delay that overcomes channel; Add training sequence, as receiving terminal do regularly synchronously, channel estimating and frequency offset estimating etc.;
Serial-parallel converter 43 transfers M road parallel signal to two ways of digital signals;
D/A switch module 44 converts two ways of digital signals to the two-way analog signal;
Software up-conversion module 45 merges the two-way analog signal handles the output OFDM signal.
Fig. 5 is the flow chart that the present invention is based on the convergence type optical access network method of OFDM.Now in conjunction with Fig. 5, the convergence type optical access network method that the present invention is based on OFDM is described, specific as follows, step comprises:
Step 501: utilize LASER Light Source to produce the light source light wave; Subsequently in the rf modulations module, produce the radiofrequency signal of millimeter wave frequency band, and with this signal loading to described light source light wave, by the radio frequency cutting, form the described multi-carrier signal that contains a plurality of frequency contents; Multi-carrier signal contains the main carrier frequency of LASER Light Source, and monosymmetric two sideband carrier frequencies, and two sideband frequency-splittings are the millimeter wave carrier frequency; Multicarrier is carried out frequency separation handle, the difference multiplexer obtains millimeter wave light carrier and base band light carrier 2 tunnel independent light signals respectively with the LASER Light Source frequency content and the sideband frequency component separation of multi-carrier signal between promptly using up; The millimeter wave light carrier is loaded need be become a millimeter glistening light of waves and carry signal by the wireless OFDM signal of millimeter wave transmission; Base band light carrier two paths of signals all is loaded the ofdm signal that needs by the base band optical signal transmission, becomes base band light and carries signal; The millimeter glistening light of waves carries signal and described base band light and carries signal and be coupled device subsequently and be coupled as one tunnel mixed signal of separating on the frequency, the incoming fiber optic link, and export Optical Distribution Network to;
Wherein, radiofrequency signal is the electrical signal of the frequency of millimeter wave, i.e. the signal of telecommunication of 30GHz-300GHz; Described millimeter wave light carrier up and down two harmonic frequency difference correspondences millimeter-wave frequency; The base band optical carrier frequency is identical with the light source light wave frequency;
In this step, the method that produces millimeter wave light carrier and base band light carrier two paths of signals comprises:
Step 5011, the light source light wave that LASER Light Source is produced transfers to MZ modulator carrier wave input, and as the primary light source of whole system, its frequency is called centre frequency; And the radio signal transmission that radio-frequency signal generator is produced is to the modulation signal end of MZ modulator; The frequency of radiofrequency signal is in and is millimere-wave band, and scope is 30GHz-300GHz;
Step 5012 is carried out the carrier wave cutting with radiofrequency signal to the light source light wave in the MZ modulator, form the multi-carrier signal that contains a plurality of frequency contents, comprises a centre frequency carrier wave identical with the light source light wave frequency in this carrier signal, and two sideband carriers; The amplitude of two sideband carriers equates; The frequency-splitting of sideband carrier is the frequency of radiofrequency signal; Two sideband carrier frequencies are symmetry with the centre frequency carrier wave;
Step 5013, adopt between light the difference multiplexer to handle multi-carrier signal,, the centre frequency carrier and sideband carrier wave in the multicarrier separated entering in the two-way optical fiber respectively by frequency separation, forming the two independent light carrier, is respectively millimeter wave light carrier and base band light carrier.
Millimeter wave light carrier and base band light carrier are added ofdm signal, and form the implementation method of mixed signal, comprise following steps:
Step 5014 is transmitted the millimeter wave light carrier MZ modulator carrier wave incoming end that enters an OFDM modulation module; The OFDM module will need to be treated to ofdm signal by the data source data of millimeter wave transmission, and will need to insert the MZ modulator signal end that links to each other with the millimeter wave light carrier by the ofdm signal of millimeter wave transmission;
Step 5015, the MZ modulator is loaded on ofdm signal on the millimeter wave light carrier in the amplitude modulation(PAM) mode by voltage control phase delay effect subsequently, forms the millimeter glistening light of waves and carries signal;
Step 5016, the base band light carrier is imported into the MZ modulator carrier wave incoming end of another OFDM modulation module, the OFDM module will need to be treated to ofdm signal by another data source data of light baseband transmission, and will need to insert MZ modulator signal end therewith by the ofdm signal of this light carrier transmission;
Step 5017, the MZ modulator is loaded on ofdm signal on the base band light carrier in the amplitude modulation(PAM) mode by voltage control phase delay effect subsequently, forms base band light and carries signal;
Step 5018 is utilized coupler, with in the two-way optical fiber independently the millimeter glistening light of waves of different frequency composition carry signal and base band light and carry signal and be coupled in the optical link, form nonoverlapping mixed signal on the frequency; The mixed signal that will have data subsequently exports Optical Distribution Network to, grows the Access Network transmission of distance.
Step 502 is utilized Optical Distribution Network, and the mixed signal that will be positioned at the optical line terminal output of local side is distributed to N the optical network unit that is positioned at far-end.
Optical Distribution Network in this step, limiting structure not, its structure can be star-like, bus-type, annular, existing structure such as point-to-point, also can be the following new construction that occurs.Present invention focuses on the convergence type optical access network system and the method based on OFDM of optical line terminal and optical network unit.Wherein, N is the positive integer more than or equal to 1.
Step 503, the difference multiplexer carries out frequency separation to the mixed signal that receives between using up, and light source frequency composition in the mixed signal and sideband frequency composition is divided to the two-way link, and become respectively that a millimeter glistening light of waves carries signal and base band light carries signal; The millimeter glistening light of waves carries signal delivers to the antenna emission, and the wireless signal that sends this moment still contains the carrier wave of two frequencies, and the carrier wave difference frequency still is the millimeter-wave signal carrier frequency; Base band light is carried signal carry out digital processing, separate obtaining WiMax/WiFi signal, UWB signal and base band data; WiMax/WiFi signal and UWB signal are sent into the antenna emission respectively; Base band data will be transferred to other application.
Wherein, millimeter wave is by this access net system, and the step of separating, sending at optical network unit is as follows:
Step 5031, the mixed signal that receives is inserted difference multiplexer (IL) between light,, handle in the mode that is similar to the A3 step by the separation on the frequency, an acquisition millimeter glistening light of waves carries signal and base band light carries signal two independent light signal, inserts the two-way optical fiber link respectively;
Step 5032, the millimeter glistening light of waves carries signal and is imported into high-speed photodetector, finishes opto-electronic conversion by photoelectric effect, forms millimeter wave electricity territory signal, so that carry out the signal emission by antenna;
Step 5033, millimeter wave electricity territory signal is imported into Anneta module to be handled, and goes out by antenna transmission then.
Base band light carries the separation of signal and handles as following steps:
Step 5034, base band light are carried signal and are imported into high-speed photodetector, finish opto-electronic conversion by photoelectric effect, generate electric territory signal, so that signal is carried out the processing in electric territory;
Step 5035, the signal of telecommunication that previous step is generated inserts A/D converter, makes analog signal conversion become digital signal, accesses to signal processing unit;
Step 5036, the digital signal input signal processing unit processes of generation is at first carried out fast Fourier transform (FFT), recovers the data source data of back acquisition at optical line terminal; According to processing such as separating of various objectives general signal wherein, then obtain WiMax/WiFi signal, UWB signal and base band data then; WiMax/WiFi signal wherein and UWB signal are sent into two antennas respectively, go out by wireless transmission.The light that base band data has then been finished long distance inserts transmitting of task, further is transferred to other equipment and uses.
The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being made, is equal to replacement, improvement etc., all should be included within the scope of protection of the invention.

Claims (7)

1.一种基于正交频分复用的汇聚式光接入网系统，其特征在于，该系统包括：光线路终端、光分配网络、N个光网络单元；1. A convergent optical access network system based on OFDM, characterized in that the system comprises: an optical line terminal, an optical distribution network, and N optical network units; 所述光线路终端包括1个激光光源、1个射频调制模块、2个OFDM调制模块、光间差复用器(IL)、耦合器；所述激光光源产生光源光波，为整个系统的光载波初始光源；所述射频调制模块中，射频信号发生器中产生毫米波段的电域射频信号，随后用此信号通过MZ调制器中将光源光波进行射频切割，形成具有多个频率成分的多载波信号；所述光间差复用器(IL)收到多载波信号后，对其进行频率分离处理，产生毫米波光载波和基带光载波两路信号；所述基带光载波的频率与光源光波具有相同的光频率；所述毫米波光载波是具有两个频率的信号，两个频率的差值就是毫米波载波的频率值，这两个频率对称分布在基带光载波频率的两侧；所述OFDM调制模块之一中的OFDM模块对一个数据源的数据进行OFDM变换处理，产生需要通过毫米波传输的OFDM信号，该信号随后在MZ调制器中被加载至毫米波光载波上，形成传输所需的毫米波光载信号；所述OFDM调制模块之二中的OFDM模块对另外一数据源的数据进行OFDM变换处理，产生的需要通过光基带传输的OFDM信号，该信号随后在MZ调制器中北加载至基带光载波上，形成传输所需的基带光载信号；所述耦合器将毫米波光载信号和基带光载信号两路独立光信号进行耦合，形成频率不重叠的混合信号，并将其输出至链路光纤，接入到所述光分配网络；The optical line terminal includes 1 laser light source, 1 radio frequency modulation module, 2 OFDM modulation modules, an inter-optical multiplexer (IL), and a coupler; the laser light source generates a light source light wave, which is the optical carrier of the entire system Initial light source; in the radio frequency modulation module, the radio frequency signal generator generates a millimeter-wave band electric domain radio frequency signal, and then uses this signal to carry out radio frequency cutting of the light wave of the light source through the MZ modulator to form a multi-carrier signal with multiple frequency components ; After the optical inter-difference multiplexer (IL) receives the multi-carrier signal, it performs frequency separation processing to generate two signals of the millimeter wave optical carrier and the baseband optical carrier; the frequency of the baseband optical carrier has the same frequency as the light wave of the light source optical frequency; the millimeter-wave optical carrier is a signal with two frequencies, the difference between the two frequencies is the frequency value of the millimeter-wave carrier, and these two frequencies are symmetrically distributed on both sides of the baseband optical carrier frequency; the OFDM modulation The OFDM module in one of the modules performs OFDM conversion processing on the data of a data source to generate an OFDM signal that needs to be transmitted through the millimeter wave. The signal is then loaded on the millimeter wave optical carrier in the MZ modulator to form the millimeter wave required for transmission. Wave-to-light carrier signal; the OFDM module in the second OFDM modulation module performs OFDM conversion processing on the data of another data source, and generates an OFDM signal that needs to be transmitted through the optical baseband, and the signal is then loaded to the baseband in the MZ modulator On the optical carrier, the baseband optical carrier signal required for transmission is formed; the coupler couples the two independent optical signals of the millimeter wave optical carrier signal and the baseband optical carrier signal to form a mixed signal with non-overlapping frequencies, and outputs it to the link optical fiber, connected to the optical distribution network; 所述光分配网络接收所述光线路终端输出的混合信号，并传递给N个所述的光网络单元，所述N个光网络单元的结构相同；其中，N为大于或等于1的整数；The optical distribution network receives the mixed signal output by the optical line terminal, and transmits it to N optical network units, and the N optical network units have the same structure; wherein, N is an integer greater than or equal to 1; 所述光网络单元，每一个单元中包括1个光间差滤波器、2个高速光电探测器、1个天线模块、3支天线、1个模/数转换器，1个信号处理单元；所述光间 差滤波器收到光分配网络传来的混合信号后，通过对信号进行频率的交错分离，获得独立的毫米波光载信号与基带光载信号，共两路；所述高速光电探测器之一将毫米波光载信号转换成毫米波电域信号；所述毫米波电域信号通过所述天线模块处理，并由所述天线之一进行无线发射；所述高速光电探测器之二将分离出的基带光载波信号转换成基带电域信号；所述模/数转换器将基带电域信号转换成数字信号；所述信号处理单元对数字信号进行快速傅里叶变换(FFT)，更具数据流的目的区分并输出WiMax/WiFi信号、UWB信号、基带数据；所述天线之二将WiMax/WiFi信号无线发送出去；所述天线之三将UWB信号无线发送出去；所述基带数据被输出供其他应用。The optical network unit, each unit includes 1 optical difference filter, 2 high-speed photodetectors, 1 antenna module, 3 antennas, 1 analog/digital converter, and 1 signal processing unit; After the optical difference filter receives the mixed signal from the optical distribution network, the signal is interleaved and separated to obtain an independent millimeter-wave optical signal and a baseband optical signal, which are two paths in total; the high-speed photodetector One of them converts the millimeter-wave light-carrying signal into a millimeter-wave electrical domain signal; the millimeter-wave electrical domain signal is processed by the antenna module and wirelessly transmitted by one of the antennas; the second high-speed photodetector separates The output baseband optical carrier signal is converted into a baseband electrical domain signal; the analog/digital converter converts the baseband electrical domain signal into a digital signal; the signal processing unit performs fast Fourier transform (FFT) on the digital signal, more The purpose of the data stream is to distinguish and output WiMax/WiFi signals, UWB signals, and baseband data; the second antenna sends out WiMax/WiFi signals wirelessly; the third antenna sends out UWB signals wirelessly; the baseband data is output for other applications. 2.根据权利要求1所述的系统，其特征在于，所述OFDM调制模块包括：1个OFDM模块和1个MZ调制器(马赫-曾德尔调制器)；2. system according to claim 1, is characterized in that, described OFDM modulation module comprises: 1 OFDM module and 1 MZ modulator (Mach-Zehnder modulator); 所述OFDM模块，包含数据源，将原始数据进行电域的正交频分复用(OFDM)处理，提供电域OFDM数据信号；The OFDM module includes a data source, and performs orthogonal frequency division multiplexing (OFDM) processing of the original data in the electric domain to provide OFDM data signals in the electric domain; 所述MZ调制器将接收到的光载波分成两束分别在调制器内的两个波导臂上传播，然后利用所述电域OFDM信号中的信息改变调制器内的两个波导臂的调制电压以改变波导的折射率，改变两个波倒闭输出的两束光之间的相位差，输出已调好的光载信号；在本专利中，所述MZ调制器对应的光载波为所述基带光载波、所述毫米波光载波，此二者通过OFDM信号加载的输出分别是所述基带光载信号、所述毫米波光载信号。The MZ modulator divides the received optical carrier into two beams and propagates on the two waveguide arms in the modulator respectively, and then uses the information in the electrical domain OFDM signal to change the modulation voltage of the two waveguide arms in the modulator To change the refractive index of the waveguide, change the phase difference between the two beams of light output by the two wave closures, and output the adjusted optical carrier signal; in this patent, the optical carrier corresponding to the MZ modulator is the baseband The optical carrier, the millimeter-wave optical carrier, and the outputs of the two loaded by OFDM signals are the baseband optical-carrying signal and the millimeter-wave optical-carrying signal respectively. 3.根据权利要求1所述的系统，其特征在于，所述射频调制模块包括：一个射频信号发生器和一个MZ调制器；3. The system according to claim 1, wherein the radio frequency modulation module comprises: a radio frequency signal generator and an MZ modulator; 所述射频信号发生器，生成毫米波频段的电域载频信号，频率范围由30GHz-300GHz，该射频信号为形成光域毫米波载频所用； The radio frequency signal generator generates an electrical domain carrier frequency signal in the millimeter wave frequency band, the frequency range is from 30GHz to 300GHz, and the radio frequency signal is used to form the optical domain millimeter wave carrier frequency; 所述MZ调制器将接收到的光源光波分成两束分别在调制器内的两个波导臂上传播，然后利用所述毫米波频率电域载频信号改变调制器内的两个波导臂的调制电压以改变波导的折射率，改变两个波倒闭输出的两束光之间的相位差，输出含有多个频率成分的多载波，即完成对光源光波进行射频切割。The MZ modulator divides the received light wave of the light source into two beams and propagates on the two waveguide arms in the modulator respectively, and then uses the millimeter-wave frequency electrical domain carrier frequency signal to change the modulation of the two waveguide arms in the modulator The voltage can change the refractive index of the waveguide, change the phase difference between the two beams of light output by the two wave closures, and output multi-carriers containing multiple frequency components, that is, complete the radio frequency cutting of the light wave of the light source. 4.根据权利要求2所述的系统，其特征在于，所述OFDM模块包括：数据源、串并变换模块、数字处理模块、并串变换模块、两个数模转换模块和软件上变频模块；4. The system according to claim 2, wherein the OFDM module comprises: a data source, a serial-to-parallel conversion module, a digital processing module, a parallel-to-serial conversion module, two digital-to-analog conversion modules and a software up-conversion module; 所述数据源产生需要传输的信号；The data source generates a signal to be transmitted; 所述串并变换模块将一路串行数据流转换为M路并行数据，形成多路信号，输出至数字处理模块；The serial-to-parallel conversion module converts one serial data stream into M parallel data streams, forms multiple signals, and outputs them to the digital processing module; 所述数字处理模块将M路串行信号进行逆快速傅里叶变换(IFFT)，即把M路数据调制到不同的正交子载波上；随后在形成的OFDM信号中加入循环前缀，用以克服信道的多径时延扩展造成的符号间干扰；加入训练序列，用作接收端作定时同步、信道估计和频偏估计等；The digital processing module performs inverse fast Fourier transform (IFFT) on the M-channel serial signals, that is, modulates the M-channel data onto different orthogonal sub-carriers; then adds a cyclic prefix to the formed OFDM signal for Overcome the inter-symbol interference caused by the multipath delay extension of the channel; add the training sequence, and use it for timing synchronization, channel estimation and frequency offset estimation at the receiving end; 所述串并变换器将M路并行数字信号转为两路数字信号；The serial-to-parallel converter converts M parallel digital signals into two digital signals; 所述数模转换模块将两路数字信号转换成两路模拟信号；The digital-to-analog conversion module converts two-way digital signals into two-way analog signals; 所述软件上变频模块将两路模拟信号合并处理，输出OFDM信号至MZ调制器进行调制。The software up-conversion module combines and processes the two analog signals, and outputs the OFDM signal to the MZ modulator for modulation. 5.一种基于正交频分复用的汇聚式光接入网方法，其特征在于，该方法包括：5. A convergent optical access network method based on OFDM, characterized in that the method comprises: A、利用激光光源产生光源光波；随后在射频调制模块中，产生毫米波频段的射频信号，并将该信号加载至所述光源光波上，通过射频切割，形成含有多 个频率成分的所述多载波信号；所述多载波信号含有激光光源的基本载波频率，以及两侧对称的两个边带载波频率，并且两边带频率差值为毫米波载波频率；对所述多载波进行频率分离处理，即用光间差复用器将多载波信号的激光光源频率成分与边带频率成分分离，分别获得毫米波光载波和基带光载波2路独立光信号；所述毫米波光载波被加载需要通过毫米波传输的无线OFDM信号，成为毫米波光载信号；所述基带光载波两路信号均被加载需要通过基带光信号传输的OFDM信号，成为基带光载信号；所述毫米波光载信号与所述基带光载信号随后被耦合器耦合为频率上分离的一路混合信号，接入光纤链路，并输出至光分配网络；所述射频信号为毫米波之频率电信号，即30GHz-300GHz的电信号；所述毫米波光载波上下两谐波频率差值对应了毫米波频率；所述基带光载波频率与光源光波频率相同；A. Use a laser light source to generate light waves of the light source; then, in the radio frequency modulation module, generate a radio frequency signal in the millimeter wave frequency band, and load the signal onto the light wave of the light source, and cut through radio frequency to form the multiple frequency components containing multiple frequency components Carrier signal; the multi-carrier signal contains the basic carrier frequency of the laser light source, and two sideband carrier frequencies symmetrical on both sides, and the difference between the two sideband frequencies is the millimeter wave carrier frequency; frequency separation processing is performed on the multi-carrier, That is, use an optical differential multiplexer to separate the frequency components of the laser light source and the sideband frequency components of the multi-carrier signal, and obtain two independent optical signals of the millimeter wave optical carrier and the baseband optical carrier respectively; the millimeter wave optical carrier needs to be loaded through the millimeter wave The transmitted wireless OFDM signal becomes a millimeter-wave optical carrier signal; the two signals of the baseband optical carrier are loaded with the OFDM signal that needs to be transmitted through the baseband optical signal, and becomes a baseband optical carrier signal; the millimeter-wave optical carrier signal and the baseband optical carrier The carrier signal is then coupled by the coupler into a mixed signal separated in frequency, connected to the optical fiber link, and output to the optical distribution network; the radio frequency signal is an electrical signal of millimeter wave frequency, that is, an electrical signal of 30GHz-300GHz; The difference between the upper and lower harmonic frequencies of the millimeter wave optical carrier corresponds to the millimeter wave frequency; the baseband optical carrier frequency is the same as the light wave frequency of the light source; B、利用光分配网络，将位于局端的光线路终端输出的混合信号分配给位于远端的N个光网络单元；N为大于或等于1的整数；B. Using the optical distribution network, the mixed signal output by the optical line terminal located at the central office is distributed to N optical network units located at the far end; N is an integer greater than or equal to 1; C、用光间差复用器对接收到的混合信号进行频率分离，将所述混合信号中的光源频率成分和边带频率成分分至两路链路中，并分别成为毫米波光载信号和基带光载信号；所述毫米波光载信号送至天线发射，此时发出的无线信号仍含有两个频率的载波，载波差频仍然为毫米波信号载波频率；对所述基带光载信号进行数字处理，分离获得WiMax/WiFi信号、UWB信号和基带数据；将所述WiMax/WiFi信号和UWB信号分别送入天线发射；基带数据将传输给其他应用。C. Use an optical differential multiplexer to frequency-separate the received mixed signal, divide the light source frequency component and sideband frequency component in the mixed signal into two links, and become millimeter-wave optical carrier signals and Baseband light-carrying signal; the millimeter-wave light-carrying signal is sent to the antenna for transmission, and the wireless signal sent at this time still contains two carrier frequencies, and the carrier difference frequency is still the carrier frequency of the millimeter-wave signal; digitize the baseband light-carrying signal Process and separate to obtain WiMax/WiFi signal, UWB signal and baseband data; send the WiMax/WiFi signal and UWB signal to the antenna for transmission; the baseband data will be transmitted to other applications. 6.根据权利要求5所述的方法，其特征在于，步骤A所述产生毫米波光载信号和基带光载信号的混合信号包括：6. The method according to claim 5, wherein the generation of the mixed signal of the millimeter wave optical signal and the baseband optical signal in step A comprises: A1、将激光光源产生的光源光波传输至MZ调制器载波输入端，用作整个系统的初始光源，其频率称为中心频率；并将射频信号发生器产生的射频信号传 输至MZ调制器的调制信号端；射频信号的频率处于为毫米波段，范围是30GHz-300GHz；A1. Transmit the light source light wave generated by the laser light source to the carrier input port of the MZ modulator, and use it as the initial light source of the entire system, and its frequency is called the center frequency; and transmit the radio frequency signal generated by the radio frequency signal generator to the MZ modulator Modulation signal terminal; the frequency of the radio frequency signal is in the millimeter wave band, and the range is 30GHz-300GHz; A2、在MZ调制器中用射频信号对光源光波进行载波切割，形成含有多个频率成分的多载波信号，该载波信号中包含一个与光源光波频率相同的中心频率载波，以及两个边带载波；两个边带载波的幅度相等；边带载波的频率差值为射频信号的频率；两个边带载波频率以中心频率载波为对称；A2. In the MZ modulator, the radio frequency signal is used to carry out carrier cutting on the light wave of the light source to form a multi-carrier signal containing multiple frequency components. The carrier signal contains a center frequency carrier with the same frequency as the light wave of the light source and two sideband carriers. ; The amplitudes of the two sideband carriers are equal; the frequency difference of the sideband carriers is the frequency of the radio frequency signal; the frequencies of the two sideband carriers are symmetrical to the center frequency carrier; A3、采用光间差复用器处理多载波信号，通过频率分离，将多载波中的中心频率载波和边带载波分别分离进入两路光纤中，形成两路独立的光载波，分别是毫米波光载波和基带光载波；A3. Use an optical differential multiplexer to process multi-carrier signals. Through frequency separation, the center frequency carrier and sideband carrier in the multi-carrier are separated into two optical fibers to form two independent optical carriers, respectively millimeter wave optical Carrier and baseband optical carrier; A4、将毫米波光载波传输进入一个OFDM调制模块的MZ调制器载波接入端；OFDM模块将需要通过毫米波传输的数据源数据处理为OFDM信号，并将需要通过毫米波传输的OFDM信号接入与毫米波光载波相连的MZ调制器信号端；A4. Transmit the millimeter wave optical carrier into the MZ modulator carrier access terminal of an OFDM modulation module; the OFDM module processes the data source data that needs to be transmitted through millimeter waves into OFDM signals, and connects the OFDM signals that need to be transmitted through millimeter waves The MZ modulator signal terminal connected to the millimeter wave optical carrier; A5、随后MZ调制器通过电压控制相位延迟效应，将OFDM信号以幅度调制方式加载至毫米波光载波上，形成毫米波光载信号；A5. Then the MZ modulator controls the phase delay effect through the voltage, and loads the OFDM signal to the millimeter-wave optical carrier in the form of amplitude modulation to form a millimeter-wave optical carrier signal; A6、将基带光载波传入另一个OFDM调制模块的MZ调制器载波接入端，OFDM模块将需要通过光基带传输的另一数据源数据处理为OFDM信号，并将需要通过该光载波传输的OFDM信号接入与此MZ调制器信号端；A6. Pass the baseband optical carrier to the MZ modulator carrier access terminal of another OFDM modulation module. The OFDM module processes another data source data that needs to be transmitted through the optical baseband into an OFDM signal, and transfers the data that needs to be transmitted through the optical carrier. OFDM signal access and this MZ modulator signal terminal; A7、随后MZ调制器通过电压控制相位延迟效应，将OFDM信号以幅度调制方式加载至基带光载波上，形成基带光载信号；A7. Then the MZ modulator controls the phase delay effect through the voltage, and loads the OFDM signal to the baseband optical carrier in the form of amplitude modulation to form a baseband optical carrier signal; A8、利用耦合器，将两路光纤中独立的不同频率成分的毫米波光载信号和基带光载信号耦合至一条光链路中，形成频率上不重叠的混合信号；随后将带有数据的混合信号输出至光分配网络，进行长距离的接入网传输。 A8. Use a coupler to couple independent millimeter-wave light-carrying signals and baseband light-carrying signals of different frequency components in two optical fibers into an optical link to form a mixed signal that does not overlap in frequency; then the mixed signal with data The signal is output to the optical distribution network for long-distance access network transmission. the 7.根据权利要求5所述的方法，其特征在于，步骤C所述分离混合信号，将分离出的毫米波光载波和基带光载波分别处理发送的方法包括：7. The method according to claim 5, wherein the method of separating the mixed signal in step C, and processing and sending the separated millimeter-wave optical carrier and baseband optical carrier respectively includes: C1、将接收到的混合信号接入光间差复用器(IL)，通过频率上的分离，以类似于A3步骤的方式处理，获得毫米波光载信号和基带光载信号两路独立的光信号，分别接入两路光纤链路；C1. Connect the received mixed signal to the optical inter-difference multiplexer (IL), and process it in a manner similar to the step A3 through frequency separation to obtain two independent optical channels of the millimeter-wave optical carrier signal and the baseband optical carrier signal Signals are respectively connected to two optical fiber links; C2、毫米波光载信号被传入高速光电探测器，通过光电效应完成光电转换，形成毫米波电域信号，以便通过天线进行信号发射；C2. The millimeter-wave light-carrying signal is transmitted to the high-speed photodetector, and the photoelectric conversion is completed through the photoelectric effect to form a millimeter-wave electric domain signal for signal transmission through the antenna; C3、毫米波电域信号被传入天线模块处理，然后通过天线发送出去。C3. The millimeter wave electric domain signal is passed into the antenna module for processing, and then sent out through the antenna. 基带光载信号的分离和处理如以下步骤：The separation and processing of the baseband optical signal are as follows: C4、基带光载信号被传入高速光电探测器，通过光电效应完成光电转换，生成电域信号，以便对信号进行电域的处理；C4. The baseband light-carrying signal is transmitted to the high-speed photodetector, and the photoelectric conversion is completed through the photoelectric effect to generate an electrical domain signal, so as to process the signal in the electrical domain; C5、将上一步生成的电信号接入模/数转换器，使模拟信号转换成数字信号，接入至信号处理单元；C5. Connect the electrical signal generated in the previous step to the analog/digital converter, so that the analog signal is converted into a digital signal, and connected to the signal processing unit; C6、生成的数字信号传入信号处理单元处理，首先进行快速傅里叶变换(FFT)，恢复后获得在光线路终端的数据源数据；然后根据不同目的将其中的信号的进行分离等处理，而后获得WiMax/WiFi信号、UWB信号和基带数据；其中的WiMax/WiFi信号和UWB信号分别送入两支天线，通过无线发送出去；基带数据则完成了长距离的光接入传输的任务，被进一步传输给其他设备使用。 C6, the generated digital signal is passed to the signal processing unit for processing, first performs fast Fourier transform (FFT), and obtains the data source data at the optical line terminal after recovery; then according to different purposes, the signals are separated and processed, Then obtain the WiMax/WiFi signal, UWB signal and baseband data; the WiMax/WiFi signal and UWB signal are sent to two antennas respectively, and sent out through wireless; the baseband data completes the task of long-distance optical access transmission and is received Further transmission to other devices for use. the
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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102725925A (en) * 2011-12-30 2012-10-10 华为技术有限公司 Tunable laser, optical network device and optical network system
CN102761373A (en) * 2011-04-28 2012-10-31 北京邮电大学 High-speed high-capacity passive optical network system and method for realizing coherent reception
WO2014194532A1 (en) * 2013-06-08 2014-12-11 华为技术有限公司 Network node transmission method, and device and system thereof
CN104468033A (en) * 2014-11-10 2015-03-25 湖南大学 Multi-band ultra wide band optical fiber wireless communication method based on low-density parity check code
CN105264795A (en) * 2013-12-31 2016-01-20 华为技术有限公司 Registration activation method, device and system for orthogonal frequency division multiplexing passive optical network
CN108521303A (en) * 2018-03-19 2018-09-11 华南师范大学 Generation method of high baud rate optical signal based on spectrum cutting and dual SSB modulation
US10389560B2 (en) 2014-01-29 2019-08-20 Huawei Technologies Co., Ltd. Baseband processing unit, radio remote unit, and communication method
CN112636841A (en) * 2020-11-18 2021-04-09 北京邮电大学 All-optical convergence system and device based on joint modulation
CN113489551A (en) * 2021-07-05 2021-10-08 吉林大学 Centimeter wave/millimeter wave ultra-wideband signal generating device

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2383926A (en) * 2000-07-07 2003-07-09 Telecomm Res Lab OFDM system with simple terminals
CN101848403A (en) * 2010-04-23 2010-09-29 中兴通讯股份有限公司 Passive optical network system and optical line terminal based on optical code division multiple access multiplexing
CN101902293A (en) * 2010-04-23 2010-12-01 中兴通讯股份有限公司 Optical network system, optical line terminal, optical network unit and optical distribution network device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2383926A (en) * 2000-07-07 2003-07-09 Telecomm Res Lab OFDM system with simple terminals
CN101848403A (en) * 2010-04-23 2010-09-29 中兴通讯股份有限公司 Passive optical network system and optical line terminal based on optical code division multiple access multiplexing
CN101902293A (en) * 2010-04-23 2010-12-01 中兴通讯股份有限公司 Optical network system, optical line terminal, optical network unit and optical distribution network device

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102761373A (en) * 2011-04-28 2012-10-31 北京邮电大学 High-speed high-capacity passive optical network system and method for realizing coherent reception
CN102725925A (en) * 2011-12-30 2012-10-10 华为技术有限公司 Tunable laser, optical network device and optical network system
WO2014194532A1 (en) * 2013-06-08 2014-12-11 华为技术有限公司 Network node transmission method, and device and system thereof
CN105264795A (en) * 2013-12-31 2016-01-20 华为技术有限公司 Registration activation method, device and system for orthogonal frequency division multiplexing passive optical network
CN105264795B (en) * 2013-12-31 2018-04-20 华为技术有限公司 Orthogonal frequency division multiplexing passive optical network registration activation method, device and system
US10389560B2 (en) 2014-01-29 2019-08-20 Huawei Technologies Co., Ltd. Baseband processing unit, radio remote unit, and communication method
CN104468033A (en) * 2014-11-10 2015-03-25 湖南大学 Multi-band ultra wide band optical fiber wireless communication method based on low-density parity check code
CN108521303A (en) * 2018-03-19 2018-09-11 华南师范大学 Generation method of high baud rate optical signal based on spectrum cutting and dual SSB modulation
CN112636841A (en) * 2020-11-18 2021-04-09 北京邮电大学 All-optical convergence system and device based on joint modulation
CN113489551A (en) * 2021-07-05 2021-10-08 吉林大学 Centimeter wave/millimeter wave ultra-wideband signal generating device
CN113489551B (en) * 2021-07-05 2022-09-20 吉林大学 Centimeter wave/millimeter wave ultra-wideband signal generating device

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