CN101714971A - Passive optical network communication method, passive optical network communication system, optical-fiber network, and optical line terminal - Google Patents
Passive optical network communication method, passive optical network communication system, optical-fiber network, and optical line terminal Download PDFInfo
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Abstract
The invention discloses a passive optical network (PON) communication method. In an up direction, an ONU adopts a broadband light source to perform spectrum division on the broadband light source through a wavelength division multiplexer, and adopts an OFDM signal to modulate the broadband light source so that the ONU realizes high-speed broadband network communication without distinguishing wavelengths or expanding the capacity of a PON system. The invention also discloses the PON system adopting the communication method, an optical network unit (ONU) and an optical line terminal (OLT). By adopting the PON communication method, a PON communication system, the ONU and the OLT, the high-speed broadband network communication is realized without distinguishing the wavelengths of the ONUs; and the ONUs of all users in the system adopt completely the same equipment so that engineering construction and network operation are simple and practicable.
Description
Technical field
The present invention relates to the network communications technology, particularly relate to a kind of EPON (PON) communication means, a kind of passive optical network communication system, a kind of optical network unit (ONU) and a kind of optical line terminal (OLT).
Background technology
The PON technology is a kind of Optical Fiber Transmission and access technology of point-to-multipoint.In present PON technology based on wavelength division multiplexing (WDM), adopt the sign of wavelength as client ONU, utilize wavelength division multiplexing (WDM) technology to realize up access, make each ONU can exclusively enjoy the light path of one road wavelength.
Existing PON system based on wavelength division multiplexing comprises ONU, OLT, wavelength division multiplexer reconciliation wavelength division multiplexer.OLT is placed on central office side, and ONU is placed on user side, and OLT conciliates wavelength division multiplexer with ONU by wavelength division multiplexer and is connected.In each ONU, adopt laser to send the light signal of a fixed wave length, the fixed wave length of different ONU correspondences has nothing in common with each other in the system.Wavelength division multiplexer has a plurality of input ports, and the fixed wave length of each ONU is the wavelength of an input port of corresponding wavelength division multiplexer respectively.Wavelength division multiplexer is multiplexed into one road light signal with the light signal that all ONU send, and gives through Optical Fiber Transmission and separates wavelength division multiplexer.Separating wavelength division multiplexer is a plurality of wavelength optical signals with one road light signal demultiplexing, the light signal of each wavelength is sent to the OLT of this wavelength correspondence.In each OLT, each optical receiver receives the light signal of a wavelength.
This shows that in existing PON system based on wavelength division multiplexing, the fixed wave length of each ONU is the wavelength of an input port of corresponding wavelength division multiplexer respectively, therefore need carry out wavelength and distinguish, with the sign of wavelength as ONU to ONU.This means that in the uplink direction, the wavelength of all ONU must have nothing in common with each other in the same PON system.Therefore, when commercialization, need be each ONU configuration different wavelength of laser device, and operator need preserve the corresponding fixed wave length inventory of huge, the complicated ONU of a number, safeguard for the engineering construction of operator and the network operation and cause great difficulty.
Summary of the invention
The invention provides a kind of EPON (PON) communication means, adopt this method can not distinguish the ONU wavelength and realize high-speed wideband network service.
The present invention also provides a kind of EPON (PON) communication system, adopts this system can not distinguish the ONU wavelength and realizes high-speed wideband network service.
The present invention also provides a kind of optical network unit (ONU), adopts this ONU can not distinguish the ONU wavelength and realizes high-speed wideband network service.
The present invention also provides a kind of optical line terminal (OLT), adopts this OLT can not distinguish the ONU wavelength and realizes high-speed wideband network service.
For achieving the above object, technical scheme of the present invention is achieved in that
The invention discloses a kind of passive optical network PON communication means, comprising:
Transmitting terminal converts each primary data information (pdi) to the orthogonal frequency division multiplex OFDM signal, each ofdm signal is carried out the conversion of digital signal to analog signal, the ofdm signal that obtains simulating generates the wide-band modulation light signal under the ofdm signal modulation of each simulation;
Transmitting terminal carries out frequency spectrum to more than one wide-band modulation light signal to be cut apart, from each wide-band modulation light signal, be partitioned into the modulated light signal of a wavelength, wherein, the wavelength difference of the modulated light signal that is partitioned in the different wide-band modulation light signals is multiplexed with one road light signal with all modulated light signals and transmits upstream to receiving terminal;
The receiving terminal receiving optical signals, with one road light signal demultiplexing is a plurality of wavelength optical signals, the light signal of each wavelength is converted to analog electrical signal, each analog electrical signal is carried out the conversion of analog signal to digital signal, obtain the digital received signal, each digital received signal is carried out the OFDM demodulation, obtain primary data information (pdi).
Described transmitting terminal converts each primary data information (pdi) to the orthogonal frequency division multiplex OFDM signal, comprising:
For each primary data information (pdi), for this primary data information (pdi) inserts forward error correction coding; Data message behind the insertion forward error correction is carried out interweaving encoding; Data message behind the interweaving encoding is carried out constellation mapping, obtain the first serial data information; Be that the first serial data information is inserted pilot frequency information; With the first serial data information translation behind the insertion pilot frequency information is the first parallel data information; According to the linearity that generates the wide-band modulation light signal with the first parallel data information distribution to different subcarriers; Each subcarrier is carried out inverse fast fourier transform IFFT, obtain the second parallel data information; Be that the second parallel data information adds Cyclic Prefix; Change the second parallel data information that adds Cyclic Prefix into second serial data information; The second serial data information is carried out windowing process, generate ofdm signal;
Described each digital received signal is carried out the OFDM demodulation, comprising:
For each digital received information, this digital received signal is carried out Synchronous Processing; Digital received signal is synchronously removed Cyclic Prefix; The digital received conversion of signals of the serial behind the removal Cyclic Prefix is parallel digital received signal; The Parallel Digital received signal is carried out FFT; Parallel Digital received signal behind the FFT is converted to the serial digital received signal; According to the pilot code in the serial digital received signal this signal is carried out channel equalization; Digital received signal after the channel equalization is carried out the constellation inverse mapping, the data message after obtaining encoding; To the data message decoding that deinterleaves behind the coding; Data message after the decoding that deinterleaves is carried out forward error correction decoding.
The invention also discloses a kind of passive optical network PON system, comprising: optical line terminal OLT, wavelength division multiplexer, Wave decomposing multiplexer and more than one optical network unit ONU;
Each ONU comprises: quadrature carrier modulation module, D/A converter module and broadband light transmitter module; Described quadrature carrier modulation module converts primary data information (pdi) to the orthogonal frequency division multiplex OFDM signal, sends ofdm signal to D/A converter module; D/A converter module is carried out the conversion of digital signal to analog signal to the ofdm signal from the quadrature carrier modulation module, and the ofdm signal that obtains simulating also sends the broadband light transmitter module to; The broadband light transmitter module receives the ofdm signal from the simulation of D/A converter module, generates the wide-band modulation light signal under the ofdm signal modulation of simulation, and the wide-band modulation light signal is sent to wavelength division multiplexer;
Described wavelength division multiplexer comprises: Multiplexing module, more than one input mouth and an output port; Each input port receives the wide-band modulation light signal of an ONU output, is partitioned into the modulated light signal of this input port corresponding wavelength and outputs to Multiplexing module from the modulated light signal of broadband; Multiplexing module is multiplexed with all modulated light signals from input port one road light signal and outputs to Wave decomposing multiplexer by output port;
Described Wave decomposing multiplexer comprises: demultiplexing module, an input port and more than one output port; Input port receives one road light signal of wavelength division multiplexer output and exports to demultiplexing module; Demultiplexing module is a plurality of wavelength optical signals with one road light signal demultiplexing, and the light signal of the wavelength output port by this wavelength correspondence is outputed to OLT;
Described OLT comprises: light wave divides reception module, analog-to-digital conversion module and quadrature carrier demodulation module; Light wave divides the light signal of reception module reception from all output ports of Wave decomposing multiplexer, and each light signal is converted to analog electrical signal and sends analog-to-digital conversion module to; Analog-to-digital conversion module obtains the digital received signal and sends the quadrature carrier demodulation module to dividing the analog electrical signal that receives module to carry out the conversion of analog signal to digital signal from light wave; The quadrature carrier demodulation module carries out the OFDM demodulation to the digital received signal from analog-to-digital conversion module, obtains primary data information (pdi).
Described broadband light transmitter module is semiconductor light-emitting-diode LED, super-radiance light emitting diode SLD or erbium-doped fiber amplifier EDFA;
And/or it is photodiode PIN that described light wave divides the reception module.
Described quadrature carrier modulation module comprises: forward error correction coding unit, interleave unit, digital modulation unit, pilot plug-in unit, the first serial to parallel conversion unit, subcarrier data allocation units, inverse fast fourier transform IFFT unit, cyclic prefix unit, the first parallel serial conversion unit and add window unit;
Described forward error correction coding unit is to send into interleave unit after primary data information (pdi) inserts forward error correction coding; Interleave unit is carried out interweaving encoding and the data message behind the interweaving encoding is sent into the digital modulation unit the data message that inserts behind the forward error correction; The data message of digital modulation unit after to interweaving encoding carries out constellation mapping, obtains the first serial data information and it is sent into pilot plug-in unit; Pilot plug-in unit is to send to the first serial to parallel conversion unit after the first serial data information is inserted pilot frequency information; The first serial to parallel conversion unit is that the first parallel data information is sent into the subcarrier data allocation units with the first serial data information translation; The subcarrier data allocation units are sent into the IFFT unit with the first parallel data information distribution according to the linearity of broadband light transmitter module to different subcarriers; The IFFT unit carries out obtaining the second parallel data information and sending into cyclic prefix unit behind the IFFT to each subcarrier; Cyclic prefix unit is to send into the first parallel serial conversion unit after the second parallel data information adds Cyclic Prefix; The second parallel data information that the first parallel serial conversion unit will add Cyclic Prefix changes the second serial data information into and sends to and add window unit; Add window unit and generate ofdm signal and output according to the second serial data information;
Described quadrature carrier demodulation module comprises: lock unit, go cyclic prefix unit, the second serial to parallel conversion unit, fast Fourier transform FFT unit, the second parallel serial conversion unit, channel equalization unit, digital demodulation unit, unit and forward error correction coding decoding unit deinterleave;
Described lock unit carries out sending into cyclic prefix unit after the Synchronous Processing to the digital received signal that receives; Send into the second serial to parallel conversion unit after going cyclic prefix unit that the digital received signal after synchronous is removed Cyclic Prefix; The second serial to parallel conversion unit is sent into the FFT unit with the digital received conversion of signals of serial for parallel digital received signal; The FFT unit carries out sending into the second parallel serial conversion unit behind the FFT to the Parallel Digital received signal; The channel equalization module is sent into after the Parallel Digital received signal is converted to the serial digital received signal in the second parallel serial conversion unit; The channel equalization module carries out sending into digital demodulation unit after the channel equalization to this signal according to the pilot code in the digital received signal; The digital received signal of digital demodulation unit after to channel equalization carries out the constellation inverse mapping, and the data message after obtaining encoding is also sent it into the unit that deinterleaves; Deinterleave and send into the forward error correction decoding unit after the unit is deciphered the data message after encoding; The forward error correction decoding unit carries out forward error correction decoding to the data message after deinterleaving, and obtains primary data information (pdi).
Further comprise among the described ONU:
Filter links to each other with the broadband light transmitter module, will be the wide-band modulation light signal of monolateral band from the wide-band modulation optical signal filtering of broadband light emission module, and the wide-band modulation light signal of monolateral band is sent to wavelength division multiplexer.
The invention also discloses a kind of optical network unit ONU, comprising:
The quadrature carrier modulation module converts primary data information (pdi) to the orthogonal frequency division multiplex OFDM signal, sends ofdm signal to D/A converter module;
D/A converter module is carried out the conversion of digital signal to analog signal to the ofdm signal from the quadrature carrier modulation module, and the ofdm signal that obtains simulating also sends the broadband light transmitter module to;
The broadband light transmitter module receives the ofdm signal from the simulation of D/A converter module, sends the wide-band modulation light signal under the ofdm signal modulation.
Described quadrature carrier modulation module comprises: forward error correction coding unit, interleave unit, digital modulation unit, pilot plug-in unit, serial to parallel conversion unit, subcarrier data allocation units, inverse fast fourier transform IFFT unit, cyclic prefix unit, parallel serial conversion unit and add window unit;
Described forward error correction coding unit is to send into interleave unit after primary data information (pdi) inserts forward error correction coding; Interleave unit is carried out interweaving encoding and the data message behind the interweaving encoding is sent into the digital modulation unit the data message that inserts behind the forward error correction; The data message of digital modulation unit after to interweaving encoding carries out constellation mapping, obtains the first serial data information and it is sent into pilot plug-in unit; Pilot plug-in unit is to send to the serial to parallel conversion unit after the first serial data information is inserted pilot frequency information; The serial to parallel conversion unit is that the first parallel data information is sent into the subcarrier data allocation units with the first serial data information translation; The subcarrier data allocation units are sent into the IFFT unit with the first parallel data information distribution according to the linearity of broadband light transmitter module to different subcarriers; The IFFT unit carries out obtaining the second parallel data information and sending into cyclic prefix unit behind the IFFT to each subcarrier; Cyclic prefix unit is to send into the parallel serial conversion unit after the second parallel data information adds Cyclic Prefix; The second parallel data information that the parallel serial conversion unit will insert Cyclic Prefix changes the second serial data information into and sends to and add window unit; Add window unit and generate ofdm signal and output according to the second serial data information.
The invention also discloses a kind of optical line terminal OLT, comprising: light wave divides reception module, analog-to-digital conversion module and quadrature carrier demodulation module;
Described light wave divides the reception module, and receiving optical signals is converted to this light signal analog electrical signal and sends analog-to-digital conversion module to;
Described analog-to-digital conversion module to dividing the analog electrical signal that receives module to carry out the conversion of analog signal to digital signal from light wave, obtains the digital received signal and sends the quadrature carrier demodulation module to;
Described quadrature carrier demodulation module carries out the orthogonal frequency division multiplex OFDM demodulation to the digital received signal from analog-to-digital conversion module, obtains primary data information (pdi).
Described quadrature carrier demodulation module comprises: lock unit, go cyclic prefix unit, serial to parallel conversion unit, fast Fourier transform FFT unit, parallel serial conversion unit, channel equalization unit, digital demodulation unit, unit and forward error correction coding decoding unit deinterleave;
Described lock unit carries out sending into cyclic prefix unit after the Synchronous Processing to the digital received signal that receives; Send into the serial to parallel conversion unit after going cyclic prefix unit that the digital received signal after synchronous is removed Cyclic Prefix; The serial to parallel conversion unit is sent into the FFT unit with the digital received conversion of signals of serial for parallel digital received signal; The FFT unit carries out sending into the parallel serial conversion unit behind the FFT to the Parallel Digital received signal; The channel equalization module is sent into after the Parallel Digital received signal is converted to the serial digital received signal in the parallel serial conversion unit; The channel equalization module carries out sending into digital demodulation unit after the channel equalization to this signal according to the pilot code in the digital received signal; The digital received signal of digital demodulation unit after to channel equalization carries out the constellation inverse mapping, and the data message after obtaining encoding is also sent it into the unit that deinterleaves; Deinterleave and send into the forward error correction decoding unit after the unit is deciphered the data message after encoding; The forward error correction decoding unit carries out forward error correction decoding to the data message after deinterleaving, and obtains primary data information (pdi).
By above summary of the invention as seen, in the PON communication means and system that the present invention proposes, at up direction, ONU adopts wideband light source, by wavelength division multiplexer wideband light source is carried out frequency spectrum and cuts apart, thereby make ONU to distinguish wavelength.Simultaneously, because the device modulation rate of emission wideband light source is lower, for avoiding reducing the communication bandwidth and the speed of PON system, realize high-speed wideband network service, the present invention adopts ofdm signal that wideband light source is modulated, since mutually orthogonal between each subcarrier of OFDM, the PON power system capacity therefore expanded.Therefore make that all users' ONU can adopt identical equipment in the PON system, and still can realize high-speed wideband network service.In commercial process, the subscriber equipment of PON system is unified, is easy to produce in enormous quantities, and operator need not to make that for each user sets up corresponding wavelength inventory the engineering construction and the network operation are simple and easy to do.
Description of drawings
Fig. 1 is the flow chart of embodiment of the invention PON communication means;
Fig. 2 is the structural representation of embodiment of the invention PON system;
Fig. 3 is the structural representation of embodiment of the invention quadrature carrier modulation module 211;
Fig. 4 is the structural representation of embodiment of the invention quadrature carrier demodulation module 243.
Embodiment
In order to make the purpose, technical solutions and advantages of the present invention clearer, describe the present invention below in conjunction with the drawings and specific embodiments.
Basic thought of the present invention is: the uplink direction in the PON system, different ONU adopts wideband light source to send light signal, from the broadband optical signal that each ONU sends, extract the light signal of the wavelength corresponding then with this ONU by the frequency spectrum cutting techniques, and then obtain corresponding with different ONU respectively a plurality of wavelength optical signals, all wavelength optical signals are multiplexed into one road signal carry out uplink.And, in order to guarantee the transmission bandwidth of PON system, adopt OFDM (OFDM) signal that the light signal of the wideband light source of ONU is modulated, make ONU send the wide-band modulation light signal; Simultaneously, in the OLT side light signal that receives is carried out the OFDM demodulation
Fig. 1 is the flow chart of the PON communication means of embodiment of the invention proposition.The PON communication means that the present invention proposes improves uplink communication, as shown in Figure 1, may further comprise the steps:
Step 101: transmitting terminal converts each primary data information (pdi) to the orthogonal frequency division multiplex OFDM signal.
In this step, for each primary data information (pdi), the detailed process that converts thereof into ofdm signal is: at first insert forward error correction coding for this primary data information (pdi), data message behind the insertion forward error correction is carried out interweaving encoding, data message behind the interweaving encoding is carried out constellation mapping, obtain the first serial data information, be that the first serial data information is inserted pilot frequency information again, with the first serial data information translation behind the insertion pilot frequency information is the first parallel data information, then according to the linearity that generates the wide-band modulation light signal with the first parallel data information distribution to different subcarriers, each subcarrier is carried out inverse fast fourier transform IFFT, obtain the second parallel data information, be that the second parallel data information adds Cyclic Prefix, change the second parallel data information that adds Cyclic Prefix into second serial data information, at last the second serial data information is carried out windowing process, generate ofdm signal.
Step 102: transmitting terminal carries out the conversion of digital signal to analog signal, the ofdm signal that obtains simulating to each ofdm signal.
Step 103: transmitting terminal generates the wide-band modulation light signal under the ofdm signal modulation of each simulation.
Step 104: transmitting terminal carries out frequency spectrum to more than one wide-band modulation light signal to be cut apart, from each wide-band modulation light signal, be partitioned into the modulated light signal of a wavelength, wherein, the wavelength difference of the modulated light signal that is partitioned into from different wide-band modulation light signals is multiplexed with one road light signal with all modulated light signals and transmits upstream to receiving terminal.
Step 105: the receiving terminal receiving optical signals is a plurality of wavelength optical signals with one road light signal demultiplexing.
Step 106: receiving terminal is converted to analog electrical signal with the light signal of each wavelength.
Step 107: receiving terminal carries out the conversion of analog signal to digital signal to each analog electrical signal, obtains the digital received signal.
Step 108: receiving terminal carries out the OFDM demodulation to each digital received signal, obtains primary data information (pdi).
In this step, the detailed process of carrying out the OFDM demodulation for each digital received information is: at first this digital received signal is carried out Synchronous Processing, digital received signal is synchronously removed Cyclic Prefix, the digital received conversion of signals that to remove the serial behind the Cyclic Prefix again is parallel digital received signal, the Parallel Digital received signal is carried out FFT, Parallel Digital received signal behind the FFT is converted to the serial digital received signal, according to the pilot code in the serial digital received signal this signal is carried out channel equalization then, digital received signal after the channel equalization is carried out the constellation inverse mapping, data message after obtaining encoding, at last to the data message decoding that deinterleaves behind the coding, data message after the decoding that deinterleaves is carried out forward error correction decoding, can obtain primary data information (pdi).
Adopt above-mentioned communication means to improve, below the PON system of the embodiment of the invention is elaborated the PON system configuration.Fig. 2 is the structural representation of embodiment of the invention PON system.Referring to Fig. 2, comprise at least in the PON system of the embodiment of the invention: wavelength division multiplexer 22, Wave decomposing multiplexer 23, OLT 24 and more than one ONU 21, adopt optical fiber to connect each other.Identical with existing PON system is, ONU 21 is positioned over client, and OLT 24 is positioned over central office side; Different with existing PON system is that the embodiment of the invention is improved the internal structure of ONU 21 and OLT 24.
Referring to Fig. 2, ONU 21 inside in the embodiment of the invention comprise at least: quadrature carrier modulation module 211, D/A converter module 212 and broadband light transmitter module 213.Quadrature carrier modulation module 211 converts primary data information (pdi) to ofdm signal, sends ofdm signal to D/A converter module 212.D/A converter module 212 receives ofdm signal from quadrature carrier modulation module 211, and ofdm signal is carried out the conversion of digital signal to analog signal, and the ofdm signal that obtains simulating also sends broadband light transmitter module 213 to.Broadband light transmitter module 213 receives the ofdm signal of simulating from D/A converter module 212, generates the wide-band modulation light signal under the ofdm signal modulation of simulation, and the wide-band modulation light signal is sent to wavelength division multiplexer 22.
The broadband light transmitter module 213 that ONU 21 adopts in the embodiment of the invention is used to produce broadband optical signal, can be semiconductor light-emitting-diode (LED), super-radiance light emitting diode (SLD) or erbium-doped fiber amplifier (EDFA).
Wavelength division multiplexer 22 in the embodiment of the invention comprises: Multiplexing module 222, output port 223 and more than one input mouth 221.Each input port 221 corresponding certain wavelengths has only the light signal of this wavelength could pass through this input port 221, and the corresponding wavelength of each input port 221 differs from one another.When a broadband optical signal enters an input port 221, be equivalent to that this broadband optical signal is carried out frequency spectrum and cut apart, the light signal with the specific wavelength of this input port 221 from this broadband optical signal splits.Each input port 221 receives the wide-band modulation light signal from an ONU 21, be partitioned into the modulated light signal of these input port 221 corresponding wavelength from the modulated light signal of broadband, and the modulated light signal of this wavelength is outputed to Multiplexing module 222.The effect of input port 221 is equal to a band pass filter, each input port 221 has the passed through wavelength of setting, when the wide-band modulation light signal is input on the input port 221, the signal component that has only wavelength in the wide-band modulation light signal to equal Tong Guo the wavelength of input port 221 can pass through this input port 221, the modulated light signal of these input port that can pass through 221 corresponding wavelength is parts of former broadband optical signal, and has and the identical modulation intelligence of broadband optical signal.Multiplexing module 222 receives the modulated light signal of each port 221 corresponding wavelength respectively from all input ports 221, after all modulated light signals are multiplexed with one road light signal, by line output on the output port 223, through after the Optical Fiber Transmission, above-mentioned road optical signal transmission after multiplexing is to Wave decomposing multiplexer 23.
Wave decomposing multiplexer 23 in the embodiment of the invention is positioned at up receiving terminal, comprising: input port 231, demultiplexing module 232 and more than one output port 233.Input port 231 receives one road light signal of wavelength division multiplexer 23 outputs, and this signal is exported to demultiplexing module 232.Demultiplexing module 232 is a plurality of wavelength optical signals with one road light signal demultiplexing.Each output port 233 corresponding certain wavelengths, the corresponding wavelength of each output port 233 differs from one another.Demultiplexing module 232 is the light signal of a plurality of different output port 233 corresponding wavelength with one road light signal demultiplexing, and the light signal of each wavelength is outputed to an OLT 24 by the pairing output port 233 of this wavelength.
The light wave of OLT 24 branch reception module 241 is photodiode (PIN) in the embodiment of the invention.
In the above embodiment of the present invention, the ofdm signal of simulation is modulated broadband light transmitter module 213 among the ONU 21, the Broad-band Modulated Signal that generates directly enters wavelength division multiplexer 22, because the wide-band modulation light signal that broadband light transmitter module 213 sends is double-side band (D SB) signal, the modulation intelligence that comprises in the sideband of two symmetries is identical, therefore adopts this kind scheme to waste bandwidth resources.For the conserve bandwidth resource, promote the transmission performance of PON system, the embodiment of the invention can also adopt another kind of scheme, that is: in above-mentioned ONU 21, add filter, this filter is positioned at after the broadband light transmitter module 213, and the Broad-band Modulated Signal of the double-side band that broadband light transmitter module 213 sends enters filter, and filter carries out filtering to it, obtain the Broad-band Modulated Signal of monolateral band (SSB) signal, and Broad-band Modulated Signal that will this monolateral band sends wavelength division multiplexer 22 to.
In the invention described above embodiment, quadrature carrier modulation module 211 is used for converting primary data information (pdi) to ofdm signal.Fig. 3 is the structural representation of the quadrature carrier modulation module 211 of the embodiment of the invention.Referring to Fig. 3, quadrature carrier modulation module 211 comprises at least: forward error correction coding unit 301, interleave unit 302, digital modulation unit 303, serial to parallel conversion unit 305, subcarrier data allocation units 306, inverse fast fourier transform (IFFT) unit 307, cyclic prefix unit 308, parallel serial conversion unit 309 and add window unit 310 can also comprise pilot plug-in unit 304.With quadrature carrier modulation module shown in Figure 3 211 is example.Forward error correction coding unit 301 is sent into interleave unit 302 for primary data information (pdi) after inserting forward error correction coding; The data message that 302 pairs of interleave unit are inserted behind the forward error correction carries out interweaving encoding and the data message behind the interweaving encoding is sent into digital modulation unit 303, and after interweaving encoding, data are converted into plural number; Data message behind the 303 pairs of interweaving encodings in digital modulation unit carries out constellation mapping, and the constellation group scope that adopts, obtains the first serial data information and it is sent into pilot plug-in unit 304 between the 16QAM in 4 quadrature amplitude modulation (QAM) after the mapping usually; Pilot plug-in unit 304 is to send it to serial to parallel conversion unit 305 after the first serial data information is inserted the pilot frequency information that is used for channel equalization; Serial to parallel conversion unit 305 is the first parallel data information with the first serial data information translation, and the first parallel data information is sent into subcarrier data allocation units 306; The subcarrier data allocation units according to the linearity of broadband light transmitter module 213 with the first parallel data information distribution to different subcarriers, each subcarrier is sent into IFFT unit 307; IFFT unit 307 carries out obtaining the second parallel data information and sending into cyclic prefix unit 308 behind the IFFT to each subcarrier; Cyclic prefix unit 308 is to send into parallel serial conversion unit 309 after the second parallel data information adds Cyclic Prefix; The second parallel data information that parallel serial conversion unit 309 will insert Cyclic Prefix changes the second serial data information into and sends to and add window unit 310; Add window unit 310 and generate the wave mode signal according to the second serial data information, ofdm signal promptly to be generated is with ofdm signal output orthogonal carrier modulation module 211.
Correspondingly, in the invention described above embodiment, quadrature carrier demodulation module 243 is used for demodulating primary data information (pdi) from the digital received signal that receives.Fig. 4 is the structural representation of the quadrature carrier demodulation module 243 of the embodiment of the invention.Referring to Fig. 4, quadrature carrier demodulation module 243 comprises at least: lock unit 401, remove cyclic prefix unit 402, serial to parallel conversion unit 403, fast Fourier transform (FFT) unit 404, parallel serial conversion unit 405, digital demodulation unit 407, deinterleave unit 408 and forward error correction coding decoding unit 409, can also comprise channel equalization unit 406.With quadrature carrier demodulation module shown in Figure 4 243 is example.The digital received signal that 401 pairs of lock units receive carries out sending into cyclic prefix unit 402 after the Synchronous Processing; After removing the Cyclic Prefix of the digital received signal after cyclic prefix unit 402 is removed synchronously, it is sent into serial to parallel conversion unit 403; Serial to parallel conversion unit 403 is sent into FFT unit 404 with the digital received conversion of signals of serial for parallel digital received signal; The 404 pairs of Parallel Digital received signals in FFT unit carry out sending into parallel serial conversion unit 405 behind the FFT; Channel equalization module 406 is sent into after the Parallel Digital received signal is converted to the serial digital received signal in parallel serial conversion unit 405; Channel equalization module 406 is carried out channel equalization according to the pilot code in the digital received signal to this signal, eliminates the signal deformity that Channel Transmission causes, and the digital received signal after the channel equalization is sent into digital demodulation unit 407; 407 pairs of digital received signals of digital demodulation unit are carried out the constellation inverse mapping, and the data message after obtaining encoding is also sent it into the unit 408 that deinterleaves; Deinterleave and send into forward error correction decoding unit 409 after data message behind the 408 pairs of codings in unit is deciphered; Data message after 409 pairs of forward error correction decoding units deinterleave carries out forward error correction decoding, finally obtains primary data information (pdi).
In quadrature carrier modulation module 211, can not comprise pilot plug-in unit 304, correspondingly, in quadrature carrier demodulation module 243, do not comprise the channel equalization module 406 of carrying out channel equalization.
By above embodiment as seen, in PON communication means and system that the present invention proposes, at up direction, ONU adopts wideband light source, by wavelength division multiplexer wideband light source is carried out frequency spectrum and cuts apart, thereby make ONU to distinguish wavelength.Simultaneously, because the device modulation rate of emission wideband light source is lower, for avoiding reducing the communication bandwidth and the speed of PON system, realize high-speed wideband network service, the present invention adopts ofdm signal that wideband light source is modulated, because mutually orthogonal between each subcarrier of OFDM, identical information code can be used, therefore the PON power system capacity can be promoted 4 times on different channels.This shows, all users' ONU can adopt identical equipment in PON communication means of the present invention and the system, and still can realize high-speed wideband network service, thereby make that the subscriber equipment of PON system is unified in the commercial process, be easy to produce in enormous quantities, operator also need not to make that for each user sets up corresponding wavelength inventory the engineering construction and the network operation are simple and easy to do simultaneously.
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 (10)
1. a passive optical network PON communication means is characterized in that, comprising:
Transmitting terminal converts each primary data information (pdi) to the orthogonal frequency division multiplex OFDM signal, each ofdm signal is carried out the conversion of digital signal to analog signal, the ofdm signal that obtains simulating generates the wide-band modulation light signal under the ofdm signal modulation of each simulation;
Transmitting terminal carries out frequency spectrum to more than one wide-band modulation light signal to be cut apart, from each wide-band modulation light signal, be partitioned into the modulated light signal of a wavelength, wherein, the wavelength difference of the modulated light signal that is partitioned in the different wide-band modulation light signals is multiplexed with one road light signal with all modulated light signals and transmits upstream to receiving terminal;
The receiving terminal receiving optical signals, with one road light signal demultiplexing is a plurality of wavelength optical signals, the light signal of each wavelength is converted to analog electrical signal, each analog electrical signal is carried out the conversion of analog signal to digital signal, obtain the digital received signal, each digital received signal is carried out the OFDM demodulation, obtain primary data information (pdi).
2. PON communication means according to claim 1 is characterized in that,
Described transmitting terminal converts each primary data information (pdi) to the orthogonal frequency division multiplex OFDM signal, comprising:
For each primary data information (pdi), for this primary data information (pdi) inserts forward error correction coding; Data message behind the insertion forward error correction is carried out interweaving encoding; Data message behind the interweaving encoding is carried out constellation mapping, obtain the first serial data information; Be that the first serial data information is inserted pilot frequency information; With the first serial data information translation behind the insertion pilot frequency information is the first parallel data information; According to the linearity that generates the wide-band modulation light signal with the first parallel data information distribution to different subcarriers; Each subcarrier is carried out inverse fast fourier transform IFFT, obtain the second parallel data information; Be that the second parallel data information adds Cyclic Prefix; Change the second parallel data information that adds Cyclic Prefix into second serial data information; The second serial data information is carried out windowing process, generate ofdm signal;
Described each digital received signal is carried out the OFDM demodulation, comprising:
For each digital received information, this digital received signal is carried out Synchronous Processing; Digital received signal is synchronously removed Cyclic Prefix; The digital received conversion of signals of the serial behind the removal Cyclic Prefix is parallel digital received signal; The Parallel Digital received signal is carried out FFT; Parallel Digital received signal behind the FFT is converted to the serial digital received signal; According to the pilot code in the serial digital received signal this signal is carried out channel equalization; Digital received signal after the channel equalization is carried out the constellation inverse mapping, the data message after obtaining encoding; To the data message decoding that deinterleaves behind the coding; Data message after the decoding that deinterleaves is carried out forward error correction decoding.
3. a passive optical network PON system is characterized in that, comprising: optical line terminal OLT, wavelength division multiplexer, Wave decomposing multiplexer and more than one optical network unit ONU;
Each ONU comprises: quadrature carrier modulation module, D/A converter module and broadband light transmitter module; Described quadrature carrier modulation module converts primary data information (pdi) to the orthogonal frequency division multiplex OFDM signal, sends ofdm signal to D/A converter module; D/A converter module is carried out the conversion of digital signal to analog signal to the ofdm signal from the quadrature carrier modulation module, and the ofdm signal that obtains simulating also sends the broadband light transmitter module to; The broadband light transmitter module receives the ofdm signal from the simulation of D/A converter module, generates the wide-band modulation light signal under the ofdm signal modulation of simulation, and the wide-band modulation light signal is sent to wavelength division multiplexer;
Described wavelength division multiplexer comprises: Multiplexing module, more than one input mouth and an output port; Each input port receives the wide-band modulation light signal of an ONU output, is partitioned into the modulated light signal of this input port corresponding wavelength and outputs to Multiplexing module from the modulated light signal of broadband; Multiplexing module is multiplexed with all modulated light signals from input port one road light signal and outputs to Wave decomposing multiplexer by output port;
Described Wave decomposing multiplexer comprises: demultiplexing module, an input port and more than one output port; Input port receives one road light signal of wavelength division multiplexer output and exports to demultiplexing module; Demultiplexing module is a plurality of wavelength optical signals with one road light signal demultiplexing, and the light signal of the wavelength output port by this wavelength correspondence is outputed to OLT;
Described OLT comprises: light wave divides reception module, analog-to-digital conversion module and quadrature carrier demodulation module; Light wave divides the light signal of reception module reception from all output ports of Wave decomposing multiplexer, and each light signal is converted to analog electrical signal and sends analog-to-digital conversion module to; Analog-to-digital conversion module obtains the digital received signal and sends the quadrature carrier demodulation module to dividing the analog electrical signal that receives module to carry out the conversion of analog signal to digital signal from light wave; The quadrature carrier demodulation module carries out the OFDM demodulation to the digital received signal from analog-to-digital conversion module, obtains primary data information (pdi).
4. PON according to claim 3 system is characterized in that,
Described broadband light transmitter module is semiconductor light-emitting-diode LED, super-radiance light emitting diode SLD or erbium-doped fiber amplifier EDFA;
And/or it is photodiode PIN that described light wave divides the reception module.
5. PON according to claim 3 system is characterized in that,
Described quadrature carrier modulation module comprises: forward error correction coding unit, interleave unit, digital modulation unit, pilot plug-in unit, the first serial to parallel conversion unit, subcarrier data allocation units, inverse fast fourier transform IFFT unit, cyclic prefix unit, the first parallel serial conversion unit and add window unit;
Described forward error correction coding unit is to send into interleave unit after primary data information (pdi) inserts forward error correction coding; Interleave unit is carried out interweaving encoding and the data message behind the interweaving encoding is sent into the digital modulation unit the data message that inserts behind the forward error correction; The data message of digital modulation unit after to interweaving encoding carries out constellation mapping, obtains the first serial data information and it is sent into pilot plug-in unit; Pilot plug-in unit is to send to the first serial to parallel conversion unit after the first serial data information is inserted pilot frequency information; The first serial to parallel conversion unit is that the first parallel data information is sent into the subcarrier data allocation units with the first serial data information translation; The subcarrier data allocation units are sent into the IFFT unit with the first parallel data information distribution according to the linearity of broadband light transmitter module to different subcarriers; The IFFT unit carries out obtaining the second parallel data information and sending into cyclic prefix unit behind the IFFT to each subcarrier; Cyclic prefix unit is to send into the first parallel serial conversion unit after the second parallel data information adds Cyclic Prefix; The second parallel data information that the first parallel serial conversion unit will add Cyclic Prefix changes the second serial data information into and sends to and add window unit; Add window unit and generate ofdm signal and output according to the second serial data information;
Described quadrature carrier demodulation module comprises: lock unit, go cyclic prefix unit, the second serial to parallel conversion unit, fast Fourier transform FFT unit, the second parallel serial conversion unit, channel equalization unit, digital demodulation unit, unit and forward error correction coding decoding unit deinterleave;
Described lock unit carries out sending into cyclic prefix unit after the Synchronous Processing to the digital received signal that receives; Send into the second serial to parallel conversion unit after going cyclic prefix unit that the digital received signal after synchronous is removed Cyclic Prefix; The second serial to parallel conversion unit is sent into the FFT unit with the digital received conversion of signals of serial for parallel digital received signal; The FFT unit carries out sending into the second parallel serial conversion unit behind the FFT to the Parallel Digital received signal; The channel equalization module is sent into after the Parallel Digital received signal is converted to the serial digital received signal in the second parallel serial conversion unit; The channel equalization module carries out sending into digital demodulation unit after the channel equalization to this signal according to the pilot code in the digital received signal; The digital received signal of digital demodulation unit after to channel equalization carries out the constellation inverse mapping, and the data message after obtaining encoding is also sent it into the unit that deinterleaves; Deinterleave and send into the forward error correction decoding unit after the unit is deciphered the data message after encoding; The forward error correction decoding unit carries out forward error correction decoding to the data message after deinterleaving, and obtains primary data information (pdi).
6. according to any described PON system in the claim 3 to 5, it is characterized in that, further comprise among the described ONU:
Filter links to each other with the broadband light transmitter module, will be the wide-band modulation light signal of monolateral band from the wide-band modulation optical signal filtering of broadband light emission module, and the wide-band modulation light signal of monolateral band is sent to wavelength division multiplexer.
7. an optical network unit ONU is characterized in that, comprising:
The quadrature carrier modulation module converts primary data information (pdi) to the orthogonal frequency division multiplex OFDM signal, sends ofdm signal to D/A converter module;
D/A converter module is carried out the conversion of digital signal to analog signal to the ofdm signal from the quadrature carrier modulation module, and the ofdm signal that obtains simulating also sends the broadband light transmitter module to;
The broadband light transmitter module receives the ofdm signal from the simulation of D/A converter module, sends the wide-band modulation light signal under the ofdm signal modulation.
8. ONU according to claim 7, it is characterized in that described quadrature carrier modulation module comprises: forward error correction coding unit, interleave unit, digital modulation unit, pilot plug-in unit, serial to parallel conversion unit, subcarrier data allocation units, inverse fast fourier transform IFFT unit, cyclic prefix unit, parallel serial conversion unit and add window unit;
Described forward error correction coding unit is to send into interleave unit after primary data information (pdi) inserts forward error correction coding; Interleave unit is carried out interweaving encoding and the data message behind the interweaving encoding is sent into the digital modulation unit the data message that inserts behind the forward error correction; The data message of digital modulation unit after to interweaving encoding carries out constellation mapping, obtains the first serial data information and it is sent into pilot plug-in unit; Pilot plug-in unit is to send to the serial to parallel conversion unit after the first serial data information is inserted pilot frequency information; The serial to parallel conversion unit is that the first parallel data information is sent into the subcarrier data allocation units with the first serial data information translation; The subcarrier data allocation units are sent into the IFFT unit with the first parallel data information distribution according to the linearity of broadband light transmitter module to different subcarriers; The IFFT unit carries out obtaining the second parallel data information and sending into cyclic prefix unit behind the IFFT to each subcarrier; Cyclic prefix unit is to send into the parallel serial conversion unit after the second parallel data information adds Cyclic Prefix; The second parallel data information that the parallel serial conversion unit will insert Cyclic Prefix changes the second serial data information into and sends to and add window unit; Add window unit and generate ofdm signal and output according to the second serial data information.
9. an optical line terminal OLT is characterized in that, comprising: light wave divides reception module, analog-to-digital conversion module and quadrature carrier demodulation module;
Described light wave divides the reception module, and receiving optical signals is converted to this light signal analog electrical signal and sends analog-to-digital conversion module to;
Described analog-to-digital conversion module to dividing the analog electrical signal that receives module to carry out the conversion of analog signal to digital signal from light wave, obtains the digital received signal and sends the quadrature carrier demodulation module to;
Described quadrature carrier demodulation module carries out the orthogonal frequency division multiplex OFDM demodulation to the digital received signal from analog-to-digital conversion module, obtains primary data information (pdi).
10. OLT according to claim 9, it is characterized in that described quadrature carrier demodulation module comprises: lock unit, go cyclic prefix unit, serial to parallel conversion unit, fast Fourier transform FFT unit, parallel serial conversion unit, channel equalization unit, digital demodulation unit, unit and forward error correction coding decoding unit deinterleave;
Described lock unit carries out sending into cyclic prefix unit after the Synchronous Processing to the digital received signal that receives; Send into the serial to parallel conversion unit after going cyclic prefix unit that the digital received signal after synchronous is removed Cyclic Prefix; The serial to parallel conversion unit is sent into the FFT unit with the digital received conversion of signals of serial for parallel digital received signal; The FFT unit carries out sending into the parallel serial conversion unit behind the FFT to the Parallel Digital received signal; The channel equalization module is sent into after the Parallel Digital received signal is converted to the serial digital received signal in the parallel serial conversion unit; The channel equalization module carries out sending into digital demodulation unit after the channel equalization to this signal according to the pilot code in the digital received signal; The digital received signal of digital demodulation unit after to channel equalization carries out the constellation inverse mapping, and the data message after obtaining encoding is also sent it into the unit that deinterleaves; Deinterleave and send into the forward error correction decoding unit after the unit is deciphered the data message after encoding; The forward error correction decoding unit carries out forward error correction decoding to the data message after deinterleaving, and obtains primary data information (pdi).
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