CN103347222A - Method and system for realizing ONU colorlessness in OFDM-PON - Google Patents
Method and system for realizing ONU colorlessness in OFDM-PON Download PDFInfo
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- CN103347222A CN103347222A CN2013102878143A CN201310287814A CN103347222A CN 103347222 A CN103347222 A CN 103347222A CN 2013102878143 A CN2013102878143 A CN 2013102878143A CN 201310287814 A CN201310287814 A CN 201310287814A CN 103347222 A CN103347222 A CN 103347222A
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Abstract
The invention provides a method and system for realizing ONU colorlessness in an OFDM-PON and relates to an optical access network communication system. The method and system for realizing ONU colorlessness in the OFDM-PON solves the problems that an existing method and system realizes ONU colorlessness at the expense of coherent detection and enables the overall system cost of the OFDM-PON to be high. According to the method and system for realizing ONU colorlessness in the OFDM-PON, a plurality of spectrum lines with different frequencies can be generated through a comb-shaped light source and is used as an optical carrier of each uplink ONU signal, in the process of downlink transmission, an OFDM signal transmitter is used as guard interval through insertion of 0 in the process of IFFT; in uplink, transmission is conducted by all ONU by the utilization of different wavelengths, and therefore colorlessness of an ONU end in the OFDM-PON system can be realized. The method and system for realizing ONU colorlessness in the OFDM-PON can be applied to the optical access communication system.
Description
Technical field
The present invention relates to the optical access network communication system, refer to realize among a kind of OFDM-PON the method and system of colourlessization of ONU especially.
Background technology
In recent years, EPON (Passive Optical Network, PON) technology with the bandwidth height, advantages such as cost is low, maintenance is simple, good reliability, be widely regarded as the optimal strategy that solves the broadband light access demand, and enforcement and the application of certain scale have been arranged in worldwide.At OFDM (Orthogonal Frequency Division Multiplexing, advantages such as after OFDM) technology was introduced into EPON, the OFDM-PON technology was big with its transmission capacity, the business that all kinds and various bandwidth requirements can be provided, professional scheduling and Bandwidth Management are flexible become the research focus of Optical Access Network rapidly.
At present, can by realize optical node (Optical Network Unit, ONU) mode of colourlessization reduces system cost, detailed process comprises: at optical line terminal (Optical Line Terminal, OLT) two lasing light emitters are set, produce two wavelength; (another wavelength is as the required light source of uplink for Orthogonal Frequency Division Multiple Access, OFDMA) transmission as descending OFDM for one of them wavelength.In order to realize that each OLT can transmit and is not subjected to the influence of beat frequency noise at same wavelength, needing up link is that carrier wave suppresses modulation system and the OLT end is relevant detection mode.
Yet, be that cost realizes colourlessization of ONU owing to detect to be concerned with, make that the entire system cost of OFDM-PON is higher.
Summary of the invention
The technical problem to be solved in the present invention provides the method and system of realizing colourlessization of ONU among a kind of OFDM-PON, can reduce system cost.
For solving the problems of the technologies described above, embodiments of the invention provide the method that realizes colourlessization of ONU among a kind of OFDM-PON, comprising:
When optical line terminal OLT sends downstream signal to optical network unit ONU, comprising: described optical line terminal OLT selects a spectral line as the descending light carrier of down link from the spectrum line that default comb-type light source produces; Described optical line terminal OLT produces the required baseband OFDM signal of telecommunication of downlink transfer; Modulate the described baseband OFDM signal of telecommunication according to described descending light carrier, obtain the light ofdm signal; The composite signal that other spectral lines are formed in the spectrum line that the optical SSB signal that described smooth ofdm signal is obtained after through sideband of single sideband filter filtering and described comb-type light source produce sends to described optical network unit ONU, and described other spectral lines are except as the spectral line the down link light carrier in the spectrum line that produces of described comb-type light source; After described optical network unit ONU receives described composite signal, described composite signal is divided into three parts, first is the optical SSB signal, second portion is two adjacent pectination spectrum lines, its frequency interval is fc, and third part is other pectination spectrum lines except described two adjacent pectination spectrum lines; Described optical network unit ONU directly detects described optical SSB signal, be converted to electric ofdm signal after, separate the mediation Digital Signal Processing, obtain original descending binary data; Described optical network unit ONU is carried out beat frequency with described two adjacent pectination spectrum lines, obtains the radiofrequency signal that frequency is fc;
When described optical network unit ONU sends upward signal to described optical line terminal OLT, comprise: default N sending module is respectively with after the last radio frequency processing of each ONU signal process in the described optical network unit ONU, be modulated on the light carrier, obtain the light ofdm signal, the radio frequency source that last radio frequency adopts is that two spectral line beat frequencies by comb-type light source form; Described each ONU signal generates according to the frequency division multiplexing mode, and described light carrier obtains according to described other spectrum lines, and direct current biasing is arranged in the linear modulation scope; A sideband of the described smooth ofdm signal of default N sending module difference filtering obtains the optical SSB signal in the described optical network unit ONU; Default N sending module is sent to described optical SSB signal on the optical fiber of main line respectively in the described optical network unit ONU; The optical SSB signal that described optical line terminal OLT detects ul transmissions carries out Photoelectric Detection, obtains the signal of telecommunication; Described optical line terminal OLT is amplified the described signal of telecommunication, obtains amplifying signal; Described optical line terminal OLT leaches the data frequency part of each ONU according to the data of each ONU of optical network unit ONU emission from described amplifying signal; Described optical line terminal OLT is partly descended radio frequency processing to the data frequency of each ONU that band pass filter leaches, reverts to base electrical signal; Described base electrical signal is carried out demodulation and Digital Signal Processing, obtain original up binary data.
On the other hand, the embodiment of the invention also provides the system that realizes colourlessization of ONU among a kind of OFDM-PON, comprising: optical line terminal OLT, main line optical fiber and optical network unit ONU;
Described optical line terminal OLT comprises:
Comb-type light source, for generation of down link and the required light carrier of up link thereof, side frequency is spaced apart fc;
The ofdm signal transmitter is for generation of the required baseband OFDM signal of telecommunication of downlink transfer;
The MZM modulator is used for the baseband OFDM signal of telecommunication is modulated to descending light carrier, obtains the light ofdm signal, and direct current biasing is arranged in the scope of linear modulation;
The optical SSB filter for a sideband of the described smooth ofdm signal of filtering, produces the optical SSB signal;
Reflection bandstop filter, be used for the descending light carrier of output and other spectral lines, described descending light carrier is to select one as down link from the spectrum line that described comb-type light source produces, and described other spectral lines are except as the spectral line the down link light carrier in the spectrum line that produces of described comb-type light source;
Connector is used for the composite signal of described optical SSB signal and described other spectral lines compositions is sent to described main line optical fiber;
First photoelectric detector, the optical SSB signal for detection of ul transmissions carries out Photoelectric Detection, obtains the signal of telecommunication;
Electric amplifier is used for the described signal of telecommunication is amplified, and obtains amplifying signal;
At least one ofdm signal processing module comprises: band pass filter, radio-frequency signal source and ofdm signal receiver;
Described band pass filter is used for the data according to each ONU of described optical network unit ONU emission, leaches the data frequency part of each ONU from described amplifying signal;
Described radio-frequency signal source is used for the signal through each ONU after the band pass filter is descended radio frequency processing, reverts to base electrical signal;
First ofdm signal receiver is used for base electrical signal is carried out demodulation and Digital Signal Processing, recovers original up binary data;
Described optical network unit ONU comprises:
Demodulation multiplexer, be used for the composite signal of described main line Optical Fiber Transmission is divided into three parts, first is the optical SSB signal, and second portion is two adjacent pectination spectrum lines, its frequency interval is fc, and third part is other pectination spectrum lines except described two adjacent pectination spectrum lines;
Second photoelectric detector is used for the optical SSB signal that described demodulation multiplexer produces is directly detected, and obtains electric ofdm signal;
The 3rd photoelectric detector is used for two adjacent pectination spectrum lines that described demodulation multiplexer produces are carried out beat frequency, obtains the radiofrequency signal that frequency is fc, is used for the last radio frequency process of up each ONU signal;
Second ofdm signal receiver is used for described electric ofdm signal is separated the mediation Digital Signal Processing, obtains original descending binary data;
At least one ONU signal transmitting module comprises ONU signal transmitter, MZM modulator, optical SSB filter;
Described ONU signal transmitter is for generation of the required baseband OFDM signal of each ONU uplink;
Described MZM modulator, each ONU signal that is used for the ONU signal transmitter is produced is through last radio frequency processing, after changing rf signal into, be modulated on the light carrier, obtain the light ofdm signal, described each ONU signal is generated according to the frequency division multiplexing mode by described ONU signal transmitter, and the radio frequency source of described upward radio frequency processing is formed by two spectral line beat frequencies of comb-type light source, described light carrier obtains according to described other spectrum lines, and direct current biasing is arranged in the linear modulation scope;
The monolateral scalar filter of described light, a sideband for the described smooth ofdm signal of filtering obtains the optical SSB signal.
The beneficial effect of technique scheme of the present invention is as follows: the technical scheme that the embodiment of the invention provides produces the spectrum line of many different frequencies by comb-type light source, as the light carrier of up each ONU signal, thereby realize colourlessization that ONU holds in the OFDM-PON system.In downlink transmission, the ofdm signal transmitter serves as protection at interval by insert 0 mode in the IFFT process, has avoided the use of radio frequency source, has reduced system cost to a certain extent; In up link, each ONU uses different wavelength to transmit, and the influence that the beat frequency of having avoided using same wavelength to produce disturbs uses direct detection just can recover each ONU signal at the OLT end, under the prerequisite that guarantees the ul transmissions performance, saved system cost greatly.
Description of drawings
Realize the flow chart one of the method for colourlessization of ONU among the OFDM-PON that Fig. 1 provides for the embodiment of the invention one
Realize the flowchart 2 of the method for colourlessization of ONU among the OFDM-PON that Fig. 2 provides for the embodiment of the invention one;
Realize the structural representation one of the system of colourlessization of ONU among the OFDM-PON that Fig. 3 provides for the embodiment of the invention two
Realize the structural representation two of the system of colourlessization of ONU among the OFDM-PON that Fig. 4 provides for the embodiment of the invention two;
Fig. 5 is the structural representation of comb-type light source in the system shown in Figure 4;
Fig. 6 is the schematic diagram of the spectrum line that produces of comb-type light source shown in Figure 5;
Fig. 7 is the structural representation of OFDM transmitter in the system shown in Figure 4;
Fig. 8 is the structural representation of OFDM receiver in the system shown in Figure 4.
Embodiment
For making the technical problem to be solved in the present invention, technical scheme and advantage clearer, be described in detail below in conjunction with the accompanying drawings and the specific embodiments.
The present invention is directed to prior art is that cost realizes colourlessization of ONU with relevant the detection, and making the entire system cost problem of higher of OFDM-PON provides the method and system of realizing colourlessization of ONU among a kind of OFDM-PON.
Embodiment one:
The embodiment of the invention provides the method that realizes colourlessization of ONU among a kind of OFDM-PON, and comprising: optical line terminal OLT sends downstream signal to optical network unit ONU, and optical network unit ONU sends upward signal to optical line terminal OLT.
Wherein, as shown in Figure 1, when optical line terminal OLT sends downstream signal to optical network unit ONU, comprising:
In the present embodiment, other spectral lines are except as the spectral line the down link light carrier in the spectrum line that produces of comb-type light source in the step 104; Other spectral lines are formed in the spectrum line that composite signal is produced through the optical SSB signal that obtains behind single sideband filter filtering sideband and comb-type light source by the light ofdm signal.
In the present embodiment, by step 105 three parts that composite signal is divided into are comprised: first is the optical SSB signal, second portion is two adjacent pectination spectrum lines, and its frequency interval is fc, and third part is other pectination spectrum lines except two adjacent pectination spectrum lines.
As shown in Figure 2, when optical network unit ONU sends upward signal to optical line terminal OLT, comprising:
Step 201, default N sending module with after the last radio frequency processing of each ONU signal process, is modulated on the light carrier respectively in the optical network unit ONU, obtains the light ofdm signal.
In the present embodiment, each ONU signal generates according to the frequency division multiplexing mode in the step 201, the radio frequency source that last radio frequency processing adopts is that two spectral line beat frequencies by comb-type light source form, and light carrier obtains according to other spectrum lines, and direct current biasing is arranged in the linear modulation scope.
Step 202, a sideband of default N sending module difference filtering light ofdm signal obtains the optical SSB signal in the optical network unit ONU.
Step 203, default N sending module is sent to the optical SSB signal on the optical fiber of main line respectively in the optical network unit ONU.
Step 204, the optical SSB signal that optical line terminal OLT detects ul transmissions carries out Photoelectric Detection, obtains the signal of telecommunication.
Step 205, optical line terminal OLT is amplified the signal of telecommunication, obtains amplifying signal.
Step 206, optical line terminal OLT leach the data frequency part of each ONU according to the data of each ONU of optical network unit ONU emission from amplifying signal.
Step 207, optical line terminal OLT is partly descended radio frequency processing to the data frequency of each ONU that band pass filter leaches, reverts to base electrical signal.
Step 208 is carried out demodulation and Digital Signal Processing to base electrical signal, obtains original up binary data.
The technical scheme that the embodiment of the invention provides is crossed the spectrum line that comb-type light source produces many different frequencies, as the light carrier of up each ONU signal, thereby realizes colourlessization that ONU holds in the OFDM-PON system.In downlink transmission, the ofdm signal transmitter serves as protection at interval by insert 0 mode in the IFFT process, has avoided the use of radio frequency source, has reduced system cost to a certain extent; In up link, each ONU uses different wavelength to transmit, and the influence that the beat frequency of having avoided using same wavelength to produce disturbs uses direct detection just can recover each ONU signal at the OLT end, under the prerequisite that guarantees the ul transmissions performance, saved system cost greatly.
Embodiment two:
As shown in Figure 3, the embodiment of the invention provides the system that realizes colourlessization of ONU among a kind of OFDM-PON, comprising: optical line terminal OLT, main line optical fiber and optical network unit ONU;
Described optical line terminal OLT comprises:
Comb-type light source 301, for generation of down link and the required light carrier of up link thereof, side frequency is spaced apart fc;
Ofdm signal transmitter 302 is for generation of the required baseband OFDM signal of telecommunication of downlink transfer;
MZM modulator 303 is used for the baseband OFDM signal of telecommunication is modulated to described descending light carrier, obtains the light ofdm signal, and direct current biasing is arranged in the scope of linear modulation;
Optical SSB filter 304 for a sideband of the described smooth ofdm signal of filtering, produces the optical SSB signal;
Reflection bandstop filter 305, be used for the descending light carrier of output and other spectral lines, described descending light carrier is to select one as down link from the spectrum line that described comb-type light source produces, and described other spectral lines are except as the spectral line the down link light carrier in the spectrum line that produces of described comb-type light source;
Connector 306 is used for the composite signal of described optical SSB signal and described other spectral lines compositions is sent to described main line optical fiber;
First photoelectric detector 307, the optical SSB signal for detection of ul transmissions carries out Photoelectric Detection, obtains the signal of telecommunication;
At least one ofdm signal processing module 309 comprises: band pass filter, radio-frequency signal source and first ofdm signal receiver;
Described band pass filter is used for the data according to each ONU of described optical network unit ONU emission, leaches the data frequency part of each ONU from described amplifying signal;
Described radio-frequency signal source is used for the signal through each ONU after the band pass filter is descended radio frequency processing, reverts to base electrical signal;
First ofdm signal receiver is used for base electrical signal is carried out demodulation and Digital Signal Processing, recovers original up binary data;
Described optical network unit ONU comprises:
Second photoelectric detector 311 is used for the optical SSB signal that described demodulation multiplexer produces is directly detected, and obtains electric ofdm signal;
The 3rd photoelectric detector 312 is used for two adjacent pectination spectrum lines that described demodulation multiplexer produces are carried out beat frequency, obtains the radiofrequency signal that frequency is fc, is used for the last radio frequency process of up each ONU signal;
Second ofdm signal receiver 313 is used for described electric ofdm signal is separated the mediation Digital Signal Processing, obtains original descending binary data;
At least one ONU signal transmitting module 314 comprises ONU signal transmitter, MZM modulator, optical SSB filter;
Described ONU signal transmitter is for generation of the required baseband OFDM signal of each ONU uplink;
Described MZM modulator, each ONU signal that is used for the ONU signal transmitter is produced is through last radio frequency processing, after changing rf signal into, be modulated on the light carrier, obtain the light ofdm signal, described each ONU signal is generated according to the frequency division multiplexing mode by described ONU signal transmitter, and the radio frequency source of described upward radio frequency processing is formed by two spectral line beat frequencies of comb-type light source, described light carrier obtains according to described other spectrum lines, and direct current biasing is arranged in the linear modulation scope;
The monolateral scalar filter of described light, a sideband for the described smooth ofdm signal of filtering obtains the optical SSB signal.
As shown in Figure 4; be 2 to be example with the number of ONU signal transmitting module 312; suppose that downlink transfer speed is 40Gbps; uplink speed is 10Gbps; use comb-type light source and realize the process of colourlessization of optical node; comprise:; in the optical line terminal OLT side; comb-type light source 401 produces many smooth spectrum lines; ofdm signal transmitter 402 produces the downgoing baseband OFDM signals of telecommunication, and the ofdm signal of its generation produces protection at interval by insert 0 mode in the IFFT process, thereby has saved the process of last radio frequency.Select comb-type light source 401 one (frequency is 193.14THZ) wherein as the light carrier of down link by reflection bandstop filter 403, be input to the descending ofdm signal of modulation in the MZM modulator 404, behind sideband of descending smooth ofdm signal process optical SSB filter 405 filterings after the modulation, other spectral lines that produce by connector 406 associating comb-type light sources are transferred to optical network unit ONU together.When arriving the optical network unit ONU side, at first through a demodulation multiplexer 407, signal is divided into 3 parts, first is the light ofdm signal, and it is through second photoelectric detector 408, be converted to the signal of telecommunication after, enter OFDM receiver 410 and carry out the DSP processing, recover original descending binary data; Second portion is two adjacent pectination spectrum lines that leach, frequency is 193.06THZ, 193.07THZ, they carry out beat frequency through the 3rd photoelectric detector 409, generated frequency is the radiofrequency signal of 10GHZ, as the radio frequency source of radio frequency on each ONU signal in the up link, the process of last radio frequency; Third part is remaining comb-type light source spectral line, as the light carrier of up each ONU, is injected into the MZM modulator and carries out light modulation, finishes the transmission of up link.
When optical network unit ONU sends upward signal to optical line terminal OLT, upstream rate is 10Gbps, 2 ONU signals generate in the mode of frequency division multiplexing, it is effective subcarrier that ONU1 signal transmitter 410 is selected 1-256,257-512 is 0, it is that 0,257-512 is effective subcarrier that ONU2 signal transmitter 411 is selected 1-256, and it is 512 that IFFT counts.After each ONU signal generates, the radiofrequency signal that is obtained by beat frequency at first, the processing of last radio frequency, obtain radio frequency ONU signal, the spectrum line that is produced by descending comb-type light source enters MZM modulator 412,413 respectively as the light carrier of each radio frequency ONU signal and carries out light intensity modulation then, the optical carrier frequency of ONU1 is 193.08THZ, and the optical carrier frequency of ONU2 is 193.12THZ.The light signal of ONU1 is through sideband of optical SSB filter 414 filterings afterwards, the light signal of ONU2 is through sideband of optical SSB filter 415 filterings, 2 ONU have been modulated at respectively on the different light carriers, when realizing colourlessization of ONU, the OLT end also can adopt direct detection mode to receive, thereby has reduced system cost.Through after the Optical Fiber Transmission, at the OLT receiving terminal, the signal of receiving directly detects by first photoelectric detector 416, obtains the signal of telecommunication, utilizes electric amplifier 417 to amplify, leach the signal of each ONU then respectively by band pass filter 418,419, descend afterwards radio frequency process 420,421, obtain baseband signal, enter OFDM receiver 422,423 at last respectively and demodulate signal, carry out DSP and handle, recover original up binary data.
Further, as shown in Figure 5, the comb-type light source that present embodiment provides can comprise: laser, MZM(Mach increase Dare) modulator, radio frequency source and DC power supply.Be added in radio frequency source on the MZM modulator and the size of DC power supply by adjusting, can export many smooth spectrum lines uses as the light carrier of each ONU of the light carrier of down link and up link thereof, in addition, in concrete enforcement, also utilize two adjacent spectrum line beat frequencies wherein to obtain the required radio frequency source of uplink, do the radio-frequencyization that has also realized the ONU end like this, further reduced the cost of system.When adjacent spectral line was spaced apart 10GHZ, the spectrum line that this comb-type light source produces can be as shown in Figure 6.
Further, as shown in Figure 7, the OFDM transmitter can comprise in the present embodiment:
QAM modulation module 701, serial to parallel conversion module 702, IFFT module 703, prefix are added module 704 and parallel serial conversion module 705.
At first, after binary bit stream is carried out the QAM mapping through QAM modulation module 701, carry out serial to parallel conversion by serial to parallel conversion module 702, for follow-up receiver is estimated channel, inserted training sequence, carry out the IFFT conversion by IFFT module 703 afterwards, produce the OFDM symbol, in order to overcome intersymbol interference and interchannel interference to greatest extent, add the Cyclic Prefix (CP) that module 704 has been inserted some by prefix, carry out parallel serial conversion and digital-to-analogue conversion by parallel serial conversion module 705 afterwards, just produced continuous ofdm signal, be transferred to processes such as carrying out light modulation among the MZM.In descending OFDM transmitter, arranging that IFFT counts is 512, and effectively subcarrier is 256, and purpose is in order to produce protection at interval, thereby has avoided the process of last radio frequency.In uplink, it is 512 that the IFFT of the OFDM transmitter of ONU1 counts, 1-256 is effective subcarrier, all the other are that the IFFT of the OFDM transmitter of 0, ONU2 counts is that 512,257-512 is effective subcarrier, all the other are 0, like this, the signal of ONU1, ONU2 has just occupied different frequency bands in the mode of frequency division multiplexing, carries out the transmission course of upward signal.
Further, as shown in Figure 8, embodiment of the invention kind OFDM receiver comprises:
Serial to parallel conversion module 801, prefix removal module 802, FFT module 803, channel estimation module 804, QAM demodulation module 805 and parallel serial conversion module 806.
After opto-electronic conversion, the electricity ofdm signal is through the A/D conversion, become the Digital Discrete signal, and then after carrying out serial to parallel conversion through serial to parallel conversion module 801, remove the CP of adding by prefix removal module 802, carry out the FFT conversion by FFT module 803, utilize channel estimation module 804 to carry out channel estimating at the training sequence that transmitter inserts afterwards, eliminate channel to the interference of signal, next signal after the equilibrium carries out QAM by QAM demodulation module 805 and separates mapping process, carry out parallel serial conversion through parallel serial conversion module 806, recover binary bit stream.
The technical scheme that the embodiment of the invention provides is crossed the spectrum line that comb-type light source produces many different frequencies, as the light carrier of up each ONU signal, thereby realizes colourlessization that ONU holds in the OFDM-PON system.In downlink transmission, the ofdm signal transmitter serves as protection at interval by insert 0 mode in the IFFT process, has avoided the use of radio frequency source, has reduced system cost to a certain extent; In up link, each ONU uses different wavelength to transmit, and the influence that the beat frequency of having avoided using same wavelength to produce disturbs uses direct detection just can recover each ONU signal at the OLT end, under the prerequisite that guarantees the ul transmissions performance, saved system cost greatly.
Realize the method and system of colourlessization of ONU among the OFDM-PON that the embodiment of the invention provides, can be applied in the optical access network communication.
The above is preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from principle of the present invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (5)
1. realize the method for colourlessization of ONU among the OFDM-PON, it is characterized in that, comprising:
When optical line terminal OLT sends downstream signal to optical network unit ONU, comprising: described optical line terminal OLT selects a spectral line as the descending light carrier of down link from the spectrum line that default comb-type light source produces; Described optical line terminal OLT produces the required baseband OFDM signal of telecommunication of downlink transfer; Modulate the described baseband OFDM signal of telecommunication according to described descending light carrier, obtain the light ofdm signal; Composite signal is sent to described optical network unit ONU, other spectral lines are formed in the spectrum line that the optical SSB signal that described composite signal is obtained after through sideband of single sideband filter filtering by described smooth ofdm signal and described comb-type light source produce, and described other spectral lines are except as the spectral line the down link light carrier in the spectrum line of described comb-type light source generation; After described optical network unit ONU receives described composite signal, described composite signal is divided into three parts, first is the optical SSB signal, second portion is two adjacent pectination spectrum lines, its frequency interval is fc, and third part is other pectination spectrum lines except described two adjacent pectination spectrum lines; Described optical network unit ONU directly detects described optical SSB signal, be converted to electric ofdm signal after, separate the mediation Digital Signal Processing, obtain original descending binary data; Described optical network unit ONU is carried out beat frequency with described two adjacent pectination spectrum lines, obtains the radiofrequency signal that frequency is fc;
When described optical network unit ONU sends upward signal to described optical line terminal OLT, comprise: default N sending module is respectively with after the last radio frequency processing of each ONU signal process in the described optical network unit ONU, be modulated on the light carrier, obtain the light ofdm signal, the radio frequency source that last radio frequency processing adopts is that two spectral line beat frequencies by comb-type light source form; Described each ONU signal generates according to the frequency division multiplexing mode, and described light carrier obtains according to described other spectrum lines, and direct current biasing is arranged in the linear modulation scope; A sideband of the described smooth ofdm signal of default N sending module difference filtering obtains the optical SSB signal in the described optical network unit ONU; Default N sending module is sent to described optical SSB signal on the optical fiber of main line respectively in the described optical network unit ONU; The optical SSB signal that described optical line terminal OLT detects ul transmissions carries out Photoelectric Detection, obtains the signal of telecommunication; Described optical line terminal OLT is amplified the described signal of telecommunication, obtains amplifying signal; Described optical line terminal OLT leaches the data frequency part of each ONU according to the data of each ONU of optical network unit ONU emission from described amplifying signal; Described optical line terminal OLT is partly descended radio frequency processing to the data frequency of each ONU that band pass filter leaches, reverts to base electrical signal; Described base electrical signal is carried out demodulation and Digital Signal Processing, obtain original up binary data.
2. realize the system of colourlessization of ONU among the OFDM-PON, it is characterized in that, comprising: optical line terminal OLT, main line optical fiber and optical network unit ONU;
Described optical line terminal OLT comprises:
Comb-type light source, for generation of down link and the required light carrier of up link thereof, side frequency is spaced apart fc;
The ofdm signal transmitter is for generation of the required baseband OFDM signal of telecommunication of downlink transfer;
The MZM modulator is used for the baseband OFDM signal of telecommunication is modulated to descending light carrier, obtains the light ofdm signal, and direct current biasing is arranged in the scope of linear modulation;
The optical SSB filter for a sideband of the described smooth ofdm signal of filtering, produces the optical SSB signal;
Reflection bandstop filter, be used for the descending light carrier of output and other spectral lines, described descending light carrier is to select one as down link from the spectrum line that described comb-type light source produces, and described other spectral lines are except as the spectral line the down link light carrier in the spectrum line that produces of described comb-type light source;
Connector is used for the composite signal of described optical SSB signal and described other spectral lines compositions is sent to described main line optical fiber;
First photoelectric detector, the optical SSB signal for detection of ul transmissions carries out Photoelectric Detection, obtains the signal of telecommunication;
Electric amplifier is used for the described signal of telecommunication is amplified, and obtains amplifying signal;
At least one ofdm signal processing module comprises: band pass filter, radio-frequency signal source and first ofdm signal receiver;
Described band pass filter is used for the data according to each ONU of described optical network unit ONU emission, leaches the data frequency part of each ONU from described amplifying signal;
Described radio-frequency signal source is used for the signal through each ONU after the band pass filter is descended radio frequency processing, reverts to base electrical signal;
First ofdm signal receiver is used for base electrical signal is carried out demodulation and Digital Signal Processing, recovers original up binary data;
Described optical network unit ONU comprises:
Demodulation multiplexer, be used for the composite signal of described main line Optical Fiber Transmission is divided into three parts, first is the optical SSB signal, and second portion is two adjacent pectination spectrum lines, its frequency interval is fc, and third part is other pectination spectrum lines except described two adjacent pectination spectrum lines;
Second photoelectric detector is used for the optical SSB signal that described demodulation multiplexer produces is directly detected, and obtains electric ofdm signal;
The 3rd photoelectric detector is used for two adjacent pectination spectrum lines that described demodulation multiplexer produces are carried out beat frequency, obtains the radiofrequency signal that frequency is fc, is used for the last radio frequency process of up each ONU signal;
Second ofdm signal receiver is used for described electric ofdm signal is separated the mediation Digital Signal Processing, obtains original descending binary data;
At least one ONU signal transmitting module comprises ONU signal transmitter, MZM modulator, optical SSB filter;
Described ONU signal transmitter is for generation of the required baseband OFDM signal of each ONU uplink;
Described MZM modulator, each ONU signal that is used for the ONU signal transmitter is produced is through last radio frequency processing, after changing rf signal into, be modulated on the light carrier, obtain the light ofdm signal, described each ONU signal is generated according to the frequency division multiplexing mode by described ONU signal transmitter, and the radio frequency source of described upward radio frequency processing is formed by two spectral line beat frequencies of comb-type light source, described light carrier obtains according to described other spectrum lines, and direct current biasing is arranged in the linear modulation scope;
The monolateral scalar filter of described light, a sideband for the described smooth ofdm signal of filtering obtains the optical SSB signal.
3. realize the system of colourlessization of ONU among the OFDM-PON according to claim 2, it is characterized in that described comb-type light source comprises:
Laser, MZM modulator, radio frequency source and DC power supply.
4. realize the system of colourlessization of ONU among the OFDM-PON according to claim 2, it is characterized in that described ofdm signal transmitter comprises:
QAM modulation module, serial to parallel conversion module, IFFT module, prefix are added module and parallel serial conversion module.
5. realize the system of colourlessization of ONU among the OFDM-PON according to claim 2, it is characterized in that described first/secondary signal receiver comprises:
Serial to parallel conversion module, prefix removal module, FFT module, channel estimation module, QAM demodulation module and parallel serial conversion module.
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