CN105578316A - OCDMA (Optical Code Division Multiple Access) and OFDM (Orthogonal Frequency Division Multiplexing) hybrid passive optical network system - Google Patents
OCDMA (Optical Code Division Multiple Access) and OFDM (Orthogonal Frequency Division Multiplexing) hybrid passive optical network system Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
- H04Q11/0067—Provisions for optical access or distribution networks, e.g. Gigabit Ethernet Passive Optical Network (GE-PON), ATM-based Passive Optical Network (A-PON), PON-Ring
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- H—ELECTRICITY
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- H04L27/2697—Multicarrier modulation systems in combination with other modulation techniques
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Abstract
The invention discloses an OCDMA and OFDM hybrid passive optical network system. At a sending end, input data are sent to the input end of an OFDM signal generator; the output end of the OFDM signal generator is connected to one input end of an external sending modulator; the output end of an OCDMA coding module is connected to the other input end of the external sending modulator; the output end of the external sending modulator is connected to one end of an optical fiber; at a receiving end, the other end of the optical fiber is connected to one input end of an external receiving modulator; the output end of an OCDMA decoding module is connected to the other input end of the external receiving modulator; the output end of the external receiving modulator is connected to the input end of an OFDM signal decoder; and the output end of the OFDM signal decoder sends out output data. According to the system of the invention, the advantages of the OFDM technique and the OCDMA technique in a PON (passive optical network) system are fully utilized; the data bandwidth is fully utilized; and the cost is reduced.
Description
Technical field
The invention belongs to technical field of optical fiber communication, be specifically related to the passive optical network that a kind of OCDMA (OFDM) and OFDM (optical code division multiple access) mixes.
Background technology
Along with the appearance of various new business and the growing bandwidth demand of people, " last one kilometer " has become the bottleneck of Access Network.As the best method solving broadband optical access demand, the advantages such as EPON (PON) technology is high with bandwidth, cost is low, structure is simple, good reliability, there has been the enforcement of certain scale in quite a lot of area in the world.In current PON technology, there is a variety of implementation method, mainly comprise the implementations such as Wave division multiplexing passive optical network (WDM-PON), time division multiplexing EPON (TDM-PON), EPON (Ethernet passive optical network) and GPON (gigabit passive optical network).
Although WDM-PON can provide higher bandwidth capacity, need the quantity being carried out adding users by the method for additional wavelength.TDM-PON technology is ripe and entered business phase gradually, but owing to adopting time division multiplexing at TDM-PON, the transmission means of burst reception, these features determine and only can not meet higher rate requirement, the EPON of such as 40Gb/s or higher rate by improving equipment performance.This mainly because of the factor such as device cost and optical fiber dispersion in TDM-PON, limits the speed of system transfers.EPON and the GPON technical standard of present stage 10Gbit/s is put into effect, and Ge great operator is also proposed corresponding product.The EPON technology also studied field of assembly and the industrial quarters extensive concern of GPON and even 100Gbit/s of 40Gbit/s.But, because current Access Network is the fusion of multiple business network, and the appearance of various new business.Current EPON and GPON technology also becomes gradually and is difficult to maintain, and needs to find better solution.
Summary of the invention
Technical problem to be solved by this invention is the deficiency that the implementation method of existing PON is difficult to meet growing multiple business network demand, provides the passive optical network that a kind of OCDMA and OFDM mixes.
For solving the problem, the present invention is achieved by the following technical solutions:
A passive optical network for OCDMA and OFDM mixing, comprise transmitting terminal and receiving terminal, transmitting terminal and receiving terminal pass through Fiber connection.Described transmitting terminal is made up of OCDMA coding module, ofdm signal maker and transmission external modulator; Input data send into the input of ofdm signal maker, the output of ofdm signal maker connects the input sending external modulator, the output of OCDMA coding module connects another input sending external modulator, sends the output of external modulator and is connected with one end of optical fiber.Described receiving terminal is made up of OCDMA decoder module, ofdm signal decoder and reception external modulator; The other end of optical fiber connects the input receiving external modulator, the output of OCDMA decoder module connects another input receiving external modulator, the output receiving external modulator is connected with the input of ofdm signal decoder, and the output of ofdm signal decoder sends output data.
Above-mentioned OCDMA coding module comprises encoded light source and coding wavelength division multiplexer; Encoded light source output connects the input of coding wavelength division multiplexer, and the output of coding wavelength division multiplexer connects transmission external modulator.
Above-mentioned ofdm signal maker comprises channel coding module, transmission serioparallel exchange module, constellation mapping block, conjugation symmetrical module, pilots insertion module, training sequence module, IFFT module, cyclic prefix module, transmission parallel serial conversion module and D/A converter module; The input access input data of channel coding module, the output of channel coding module is through sending the input of serioparallel exchange model calling constellation mapping block; The output of constellation mapping block is through the input of conjugation symmetrical model calling pilots insertion module; After the output of pilots insertion module is placed on training sequence module, send into IFFT module together; The output of IFFT module connects the input sending parallel serial conversion module through cyclic prefix module; The output sending parallel serial conversion module connects the input of D/A converter module, and the output of D/A converter module is connected with the input sending external modulator.
Above-mentioned OCDMA decoder module comprises decoding light source and decoding wavelength division multiplexer; Decoding light source output connects the input of decoding wavelength division multiplexer, and the output connection of decoding wavelength division multiplexer receives external modulator.
Above-mentioned ofdm signal decoder comprises analog-to-digital conversion module, receives serioparallel exchange module, goes cyclic prefix module, FFT module, channel equalization module, goes asymmetric conjugate module, constellation demapping module and channel coding module; The input of analog-to-digital conversion module connects the output receiving external modulator, and the output of analog-to-digital conversion module connects the input receiving serioparallel exchange module; The output receiving serioparallel exchange module is connected with the input of FFT module through going cyclic prefix module; The output channel equalized model calling of FFT module removes the input of asymmetric conjugate module, goes the output of asymmetric conjugate module to be connected with the input of channel coding module through constellation demapping module; Channel coding module send output data.
Compared with prior art, the present invention mainly contains following advantage:
What 1, the present invention adopted is the EPON that optical code division multiple access (OCDMA) and OFDM (OFDM) mix, take full advantage of OFDM technology and the advantage of OCDMA technology in PON system, as the ability of the raising of band efficiency, resisting chromatic dispersion and polarization mode dispersion, as asynchronous transmission, transmission security performance high, compared with other EPONs that same subscriber number is traditional, system price is cheaper;
2, the OFDM signal of telecommunication of transmitting terminal output of the present invention, frequency spectrum only comprises real part part, and the OCDMA address code sequence simultaneously generated at receiving terminal adopts Direct Inspection Technology to demodulate the OFDM signal of telecommunication, and the complexity of the system of reduction has saved cost simultaneously;
3, the present invention is directed to the demand of different user, the FFT point of Dynamic Resource Allocation for Multimedia can be provided, make full use of data bandwidth.
Accompanying drawing explanation
Fig. 1 is the entire block diagram of the passive optical network that a kind of OCDMA and OFDM mixes.
Fig. 2 is the block diagram of OCDMA coding module.
Fig. 3 is ofdm signal maker block diagram.
Fig. 4 is the block diagram of OCDMA decoder module.
Fig. 5 is ofdm signal decoder block diagram.
Embodiment
A passive optical network for OCDMA and OFDM mixing, as shown in Figure 1, comprise transmitting terminal and receiving terminal, transmitting terminal and receiving terminal pass through Fiber connection.
Described transmitting terminal is made up of OCDMA coding module, ofdm signal maker and transmission external modulator.Input data send into the input of ofdm signal maker, the output of ofdm signal maker connects the input sending external modulator, the output of OCDMA coding module connects another input sending external modulator, sends the output of external modulator and is connected with one end of optical fiber.
Above-mentioned OCDMA coding module comprises encoded light source and wavelength division multiplexer of encoding, and encoded light source output connects the input of coding wavelength division multiplexer, and the output of coding wavelength division multiplexer connects transmission external modulator.In a preferred embodiment of the invention, encoded light source is that Amplified Spontaneous penetrates ASE wideband light source, and coding wavelength division multiplexer adopts fiber grating (FBGs) or photonic lightwave circuit (PLCs) to realize.See Fig. 2.
In OCDMA coding module, encoded light source produces stable light signal, connects the coding wavelength division multiplexer of rear class.Through the wide spectrum light source of coding wavelength division multiplexer, the light signal of multiple wavelength can be leached, namely produce the OCDMA address code coded sequence of particular sequence, then send into and send in external modulator.In transmission external modulator, modulated ofdm signal is carried out coding by OCDMA address code coded sequence and is admitted to fiber channel.As (7,3,1,1) (1101000) address code that OOC code is concentrated, coding wavelength division multiplexer is 1550.0nm to 1552.4nm, each wavelength interval is 0.4nm, and the wavelength of optical signal namely exported through wavelength division multiplexer is respectively 1550.0nm, 1550.4nm, 1550.8nm, 1551.2nm, 1551.6nm, 1552.0nm, 1552.4nm.Above-mentioned ofdm signal maker comprises channel coding module, transmission serioparallel exchange module, constellation mapping block, conjugation symmetrical module, pilots insertion module, training sequence module, IFFT (inverse Fourier transform) module, cyclic prefix module, transmission parallel serial conversion module and D/A converter module.The input access input data of channel coding module, the output of channel coding module is through sending the input of serioparallel exchange model calling constellation mapping block.The output of constellation mapping block is through the input of conjugation symmetrical model calling pilots insertion module.After the output of pilots insertion module is placed on training sequence module, send into IFFT module together.The output of IFFT module connects the input sending parallel serial conversion module through cyclic prefix module.The output sending parallel serial conversion module connects the input of D/A converter module, and the output of D/A converter module is connected with the input sending external modulator.See Fig. 3.
Ofdm signal maker is only the solid part signal of the OFDM signal of telecommunication mainly for producing frequency spectrum.Specific works principle is: the signal of channel coding module to input carries out a series of chnnel coding, and as interweaved, convolution, the technology such as RS code, increase the anti-interference of input signal.Input signal through chnnel coding sends into transmission serioparallel exchange module, is the parallel data stream of certain bit, for rear class constellation mapping by converting serial data streams.Parallel data stream through constellation mapping block is mapped on the preferred coordinates point of planisphere.Pilots insertion module inserts pilot frequency information to the data after constellation mapping of some, and the number wherein inserting pilot frequency information is determined according to counting of rear class IFFT module.If be N point IFFT, according to the conjugate symmetry of Fourier transform, for obtaining the frequency spectrum only effective ofdm signal of solid part signal.Load data to N/2 before IFFT point, the data of rear N/2 point are the conjugation symmetry of front N/2 data, and the complex data imaginary part of output is 0, i.e. solid part signal.Training sequence module adds the local training sequence through IFFT to the solid part signal head after IFFT.Cyclic prefix module adds Cyclic Prefix, to prevent intersymbol interference to the real part data through IFFT conversion of adding local training sequence.Transmission parallel serial conversion module and D/A converter module carry out parallel-serial conversion and digital-to-analogue conversion to the data after interpolation Cyclic Prefix respectively, then send into and send external modulator.
Described receiving terminal is made up of OCDMA decoder module, ofdm signal decoder and reception external modulator.The other end of optical fiber connects the input receiving external modulator, the output of OCDMA decoder module connects another input receiving external modulator, the output receiving external modulator is connected with the input of ofdm signal decoder, and the output of ofdm signal decoder sends output data.
Above-mentioned OCDMA decoder module is consistent with the structure of OCDMA coding module, and comprise decoding light source and decoding wavelength division multiplexer, light source output of decoding connects the input of decoding wavelength division multiplexer, and the output of decoding wavelength division multiplexer connects reception external modulator.In a preferred embodiment of the invention, decoding light source is that Amplified Spontaneous penetrates ASE wideband light source, and decoding wavelength division multiplexer adopts fiber grating (FBGs) or photonic lightwave circuit (PLCs) to realize.See Fig. 4.
In OCDMA decoder module, decoding light source produces stable light signal, connects the decoding Wave decomposing multiplexer of rear class.Through the wide spectrum light source of decoding Wave decomposing multiplexer, leach the light signal of multiple wavelength, produce the OCDMA address code decoding sequence with transmitting terminal strict conformance, then send into and receive in external modulator.In reception external modulator, modulated ofdm signal is carried out coding by OCDMA address code decoding sequence and is admitted to fiber channel.
Above-mentioned ofdm signal decoder comprises analog-to-digital conversion module, receives serioparallel exchange module, goes cyclic prefix module, FFT (Fourier transform) module, channel equalization module, goes asymmetric conjugate module, constellation demapping module and channel coding module.The input of analog-to-digital conversion module connects the output receiving external modulator, and the output of analog-to-digital conversion module connects the input receiving serioparallel exchange module.The output receiving serioparallel exchange module is connected with the input of FFT module through going cyclic prefix module.The output channel equalized model calling of FFT module removes the input of asymmetric conjugate module, goes the output of asymmetric conjugate module to be connected with the input of channel coding module through constellation demapping module.Channel coding module send output data.See Fig. 5.Because training sequence is the sequence that transmitting terminal and receiving terminal are all known.The known array received is carried out synchronous and balanced at receiving terminal.Namely follow the tracks of channel by the method for channel estimating to change accordingly, thus the data received are corrected and recovers.
Ofdm signal decoder is mainly for reduction subscriber signal.Specific works principle is: the effective OFDM signal of telecommunication of only solid part signal produced through receiving external modulator is accessed analog-to-digital conversion module.The digital signal that analog-to-digital conversion module exports after carrying out analog-to-digital conversion to it is sent into and is received serioparallel exchange module, carries out serioparallel exchange to it.Go cyclic prefix module to remove Cyclic Prefix to parallel data, remove the packet of Cyclic Prefix containing the data after IFFT after known training sequence and input data.FFT module does the FFT computing of respective point respectively to the data of these two parts.Channel equalization module carries out channel equalization according to the data of known training sequence after FFT.The result of channel equalization sends into constellation demapping module after the past, conjugate pair claimed, and carries out dynamic conditioning to the threshold value of planisphere, carries out demapping to the data removing training sequence after FFT simultaneously.According to the asymmetric conjugate of Fourier transform solid part signal frequency spectrum, front N/2 data of constellation demapping are valid data, and a rear N/2 data are the conjugation of valid data.Rear N/2 the data exported do not process, and the front N/2 valid data of output are the data after transmitting terminal chnnel coding.Send output data after carrying out channel-decoding to this partial data, channel decoding module comprises deinterleaving, Viterbi decoding, RS code etc.The module such as intertexture, convolution, RS code of corresponding transmitting terminal chnnel coding respectively.
OFDM technology derives from radio frequency transmission field, applies to not only can realize the higher availability of frequency spectrum in PON technology, but also has the ability of resisting chromatic dispersion and polarization mode dispersion.OCDMA technology is communication mode code division multiple access (CDMA) technology combined with optical fiber communication, and have support asynchronous transmission, host-host protocol is transparent, the feature of user's shared channel.The present invention makes full use of the outstanding advantages of OFDM and OCDMA, OFDM technology is combined the EPON of realized a kind of mixing with OCDMA technology effective, there is the availability of frequency spectrum high, resisting chromatic dispersion and polarization mode dispersion, transmission system compatibility and favorable expandability, excellent Bandwidth sharing mechanism, asynchronous transmission, system safety performance high.
Claims (5)
1. a passive optical network for OCDMA and OFDM mixing, comprise transmitting terminal and receiving terminal, transmitting terminal and receiving terminal pass through Fiber connection; It is characterized in that:
Described transmitting terminal is made up of OCDMA coding module, ofdm signal maker and transmission external modulator; Input data send into the input of ofdm signal maker, the output of ofdm signal maker connects the input sending external modulator, the output of OCDMA coding module connects another input sending external modulator, sends the output of external modulator and is connected with one end of optical fiber;
Described receiving terminal is made up of OCDMA decoder module, ofdm signal decoder and reception external modulator; The other end of optical fiber connects the input receiving external modulator, the output of OCDMA decoder module connects another input receiving external modulator, the output receiving external modulator is connected with the input of ofdm signal decoder, and the output of ofdm signal decoder sends output data.
2. the passive optical network of a kind of OCDMA and OFDM mixing according to claim 1, is characterized in that:
Above-mentioned OCDMA coding module comprises encoded light source and coding wavelength division multiplexer; Encoded light source output connects the input of coding wavelength division multiplexer, and the output of coding wavelength division multiplexer connects transmission external modulator.
3. the passive optical network of a kind of OCDMA and OFDM mixing according to claim 1, is characterized in that:
Above-mentioned ofdm signal maker comprises channel coding module, transmission serioparallel exchange module, constellation mapping block, conjugation symmetrical module, pilots insertion module, training sequence module, IFFT module, cyclic prefix module, transmission parallel serial conversion module and D/A converter module;
The input access input data of channel coding module, the output of channel coding module is through sending the input of serioparallel exchange model calling constellation mapping block; The output of constellation mapping block is through the input of conjugation symmetrical model calling pilots insertion module; The input of the output access IFFT module of pilots insertion module and training sequence module; The output of IFFT module connects the input sending parallel serial conversion module through cyclic prefix module; The output sending parallel serial conversion module connects the input of D/A converter module, and the output of D/A converter module is connected with the input sending external modulator.
4. the passive optical network of a kind of OCDMA and OFDM mixing according to claim 1, is characterized in that:
Above-mentioned OCDMA decoder module comprises decoding light source and decoding wavelength division multiplexer; Decoding light source output connects the input of decoding wavelength division multiplexer, and the output connection of decoding wavelength division multiplexer receives external modulator.
5. the passive optical network of a kind of OCDMA and OFDM mixing according to claim 1, is characterized in that:
Above-mentioned ofdm signal decoder comprises analog-to-digital conversion module, receives serioparallel exchange module, goes cyclic prefix module, FFT module, channel equalization module, goes asymmetric conjugate module, constellation demapping module and channel coding module;
The input of analog-to-digital conversion module connects the output receiving external modulator, and the output of analog-to-digital conversion module connects the input receiving serioparallel exchange module; The output receiving serioparallel exchange module is connected with the input of FFT module through going cyclic prefix module; The output channel equalized model calling of FFT module removes the input of asymmetric conjugate module, goes the output of asymmetric conjugate module to be connected with the input of channel coding module through constellation demapping module; Channel coding module send output data.
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