CN102780669A - Implementation method and device of all-optical OFDM (Orthogonal Frequency Division Multiplexing) signal photosphere network code - Google Patents
Implementation method and device of all-optical OFDM (Orthogonal Frequency Division Multiplexing) signal photosphere network code Download PDFInfo
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Abstract
The invention relates to an implementation method and an implementation device of an all-optical OFDM (Orthogonal Frequency Division Multiplexing) signal photosphere network code. The method comprises the following steps of: splitting two paths of all-optical OFDM signals into orthogonal subcarrier signals at a coding node so as to realize the widening for signal pulse width; and merging the output into new all-optical OFDM signals by using all-optical logical difference or the coding calculation of the subcarrier signals realizing identical frequency. A decoding node and the coding node have similar structures and functions, and the original input all-optical OFDM signals are recovered through solution difference or calculation. The device comprises a demultiplex module, a pulse widening module, an all-optical logical difference or module and a multiplex module at the coding and decoding nodes, an optical amplification module and a dispersion compensation module in optical fiber transmission. The method and the device use network coding thought to realize the purpose of all-optical OFDM signal network multicast, reduce the difficulty of pulse bit-oriented alignment and improve the tolerance of pulse delay difference by using the pulse widening method before the calculation of coding and decoding.
Description
Technical field
The present invention relates to a kind of method and apparatus of realizing the photosphere network code, relate in particular to the method and apparatus that a kind of full light ofdm signal is realized the photosphere network code, belong to communication technical field.
Background technology
In traditional multicast communication network, information transmitted only is sent to destination node with the mode of storage and forwarding via the intermediate node of network, does not generally do any data processing.And the proposition of network coding technique has changed the routing mechanism of traditional multicast.This technology allows network node that information transmitted is carried out encoding process according to suitable mode; Thereby reach the theoretic maximum transfer capacity of multicast network, can promote network throughput, balance network load effectively simultaneously; Improve bandwidth availability ratio, strengthen the fault-tolerance and the robustness of network.
Optical-fiber network becomes the inexorable trend of future network development because of it has transmission rate and large-capacity data transmittability at a high speed.Network code is incorporated in the middle of the optical multicast network, can further improves the performance of full-light multicast network, improve the QoS of multicast network, the influence that the reply link failure brings for the full-light multicast network.But some characteristics of optical-fiber network have constituted certain restriction to network code in the application of optical multicast network.The computing capability in electricity territory is strong, and the linear operation at the coding nodes place can be easy to realization, and in the light territory, lacks light memory device at random, and logic is simple, a little less than the computing capability, is difficult to accomplish complicated linear encoding and decoding computing.Therefore; The photosphere network code algorithm that exists at present; Be mainly to utilize the conversion of photoelectricity light to realize the legacy network coding on the one hand, but the photoelectricity light conversion method increase overhead easily, reduces systematic function at optical-fiber network; And can become the bottleneck of high speed information transmission, can not embody the advantage of network code and all-optical network.On the other hand, utilize in the network that network code realizes full-light multicast existing, network code exists the design of coded system and coding node too complicated, under the current optical devices condition, is difficult to realize, to problems such as network architecture requirement harshnesses.To these problems that exist, require the photosphere network code can under current full optical device restriction, have implementation method simple and fast, highly versatile, can in the light territory, be independent of the advantage that photoelectricity light is changed.Therefore, how to realize under full light that network code is a problem that is worth further investigation.
Meanwhile, in order under the finite bandwidth condition, to realize the transmission of information high-capacity and high-speed rate, light positive hands over frequency division technique as a kind of modulation technique that can realize spectral efficient, and the damage during effectively compensated fiber transmits simultaneously becomes the research focus day by day.Optical OFDM system has merged the advantage of wireless OFDM technology and optical communication, has advantages such as high transfer rate, high resisting chromatic dispersion ability, spectral efficient.Research shows that optical OFDM system can construct the optical transport network of two-forty, low cost, long distance on the basis of existing optical transmission system, is one of potential technology that realizes the long haul optical transmission of ultrahigh speed of future generation.
In conjunction with above-mentioned two kinds of actual conditions; In order effectively to realize the high-speed transfer of optical network multicast business; The present invention proposes a kind of implementation method and device of full light ofdm signal photosphere network code; Compatible with single wavelength signals transmission simultaneously and the transmission of variable bit rate light ofdm signal utilize full optical device to realize corresponding light signal encoding and decoding processing at network code node and decode node place.
Summary of the invention
The invention provides a kind of implementation method and device of full light ofdm signal photosphere network code; Full light ofdm signal is decomposed into orthogonal sub-carriers; Through the Code And Decode computing of complete each orthogonal sub-carriers signal of light XOR gate realization OFDM, again the orthogonal sub-carriers signal is merged into full light ofdm signal.In conjunction with the ofdm signal characteristics, before the Code And Decode computing, realize the signal pulse broadening, improve the tolerance that full light XOR is conciliate XOR paired pulses step-by-step alignment.
In order to realize above-mentioned goal of the invention, the present invention adopts following technical scheme:
A kind of implementation method of full light ofdm signal photosphere network code is characterized in that may further comprise the steps:
Step 1: obtain the full light ofdm signal of two-way, as the input signal of network code node;
Step 2: utilize demultiplexing module that the full light ofdm signal of two-way is decomposited each orthogonal sub-carriers signal respectively at the coding nodes place;
Step 3: according to full light ofdm signal characteristic, do not produce under the situation of any signal cross-talk, utilize the time space that exists between each road orthogonal sub-carriers signal pulse, the width of broadening signal pulse in assurance;
Step 4: utilize all-optical logic XOR module to realize the all-optical logic XOR of two-way input ofdm signal, accomplish the network code function with sub-carrier signal frequently;
Step 5: utilize Multiplexing module that each road orthogonal sub-carriers signal of full light XOR gained is merged into new full light ofdm signal;
Step 6: through Optical Fiber Transmission, obtain the new full light ofdm signal and the full light ofdm signal of one tunnel input wherein at the decode node place, in order to realize decoding operation;
Step 7: utilize demultiplexing module that the full light ofdm signal of new full light ofdm signal and wherein one tunnel input is decomposited each orthogonal sub-carriers signal respectively;
Step 8: according to full light ofdm signal characteristic, do not produce under the situation of any signal cross-talk, utilize the time space that exists between each road orthogonal sub-carriers signal pulse, once more the pulse duration of broadening signal in assurance;
Step 9: utilize all-optical logic XOR module to realize that the new full light OFDM sub-carrier signal and the all-optical logic of the full light OFDM sub-carrier signal of one tunnel input wherein separate XOR, accomplish the network decoding function;
Step 10: utilize Multiplexing module that each road orthogonal sub-carriers signal of full photodissociation XOR gained is merged into full light ofdm signal; Recover another Lu Quanguang OFDM input signal; Decode node obtains the full light ofdm signal of two-way input simultaneously, utilizes network code thought to realize the purpose of all-optical network multicast.
In the said step 1; When the two-way input signal is not full light ofdm signal entirely; Can carry out full light OFDM conversion to signal, realize compatibility, and one group of orthogonal frequency of the number of the subcarrier of the full light ofdm signal of two-way, subcarrier chooses to guarantee it is consistent single wavelength signals.
In the said step 2 and 7, the output port number of demultiplexing module is consistent with number of sub carrier wave, realizes in the module that the choosing of frequency interval, bandwidth and center-frequency parameters of demultiplexing function optical device should be definite according to choosing of full light ofdm signal orthogonal frequency.
In the said step 3 and 8; Do not produce under the situation of any signal cross-talk in assurance; Pulse can be confirmed by full light ofdm signal pulse duration and sub-carrier signal pulse spacing by the width range of broadening; The purpose of pulse stretching is the accuracy of conciliating the XOR result for the all-optical logic XOR after guaranteeing, because possibly there is delay in the transmission of two paths of signals, when utilizing all-optical logic XOR module to realize the Code And Decode computing; The delay difference that exists between the sub-carrier signal pulse will impact the acquisition that XOR is conciliate the XOR correct result; Through the pulse duration broadening, reduced the difficulty of pulse step-by-step alignment, improved tolerance to a certain extent to the signal pulse delay difference.
In the said step 4; The input signal of all-optical logic XOR module is that two-way is with sub-carrier signal frequently; Confirm the number N of all-optical logic XOR module according to number of sub carrier wave; Choose N orthogonal frequency simultaneously and survey optical signal frequency, be used to carry the coding result of two-way, and guarantee that between each road XOR gained signal be quadrature with frequency sub-carrier signal XOR as the input of all-optical logic XOR module.
In the said step 5 and 10, the input port number of Multiplexing module is consistent with number of sub carrier wave, realizes in the module that the choosing of frequency interval, bandwidth and center-frequency parameters of multiplexing function optical device should be definite according to choosing of full light ofdm signal orthogonal frequency.
In the said step 6, decay that produces in the Optical Fiber Transmission and dispersive influence respectively by light amplification module and dispersion compensation module in order to offset.
In the said step 9; The full light OFDM sub-carrier signal of new full light OFDM sub-carrier signal that step 8 is obtained or one tunnel input carries out frequency modulation(FM); The input signal that guarantees all-optical logic XOR module is that two-way is with sub-carrier signal frequently; Identical with said step 4, confirm the number N of all-optical logic XOR module according to number of sub carrier wave, choose N orthogonal frequency simultaneously and survey optical signal frequency as the input of all-optical logic XOR module; Be used to carry the coding result of two-way, and guarantee that between each road XOR gained signal be quadrature with frequency sub-carrier signal XOR.
A kind of device of full light ofdm signal photosphere network code; Be used to realize the method for above-mentioned full light ofdm signal photosphere network code; Include demultiplexing module, pulse stretching module, all-optical logic XOR gate module and Multiplexing module in coding nodes and decode node; Comprise light amplification module and dispersion compensation module in the Optical Fiber Transmission process, it is characterized in that:
Demultiplexing module:, be used for full light ofdm signal is decomposited each orthogonal sub-carriers signal at coding nodes and decode node;
Pulse stretching module: at coding nodes and decode node; According to full light ofdm signal characteristic; Do not produce under the situation of any signal cross-talk in assurance, be used for the width of broadening signal pulse, through the pulse duration broadening; Reduce the all-optical logic XOR and conciliate the difficulty that XOR paired pulses step-by-step alignment requires, will improve tolerance to a certain extent the delay difference that exists between the signal pulse;
All-optical logic XOR gate module: at coding nodes and decode node, be used to realize the all-optical logic XOR reconciliation XOR of two-way input ofdm signal, realize network code and decoding function with sub-carrier signal frequently;
Multiplexing module:, be used for each road orthogonal sub-carriers signal of full light XOR gained is merged into new full light ofdm signal at coding nodes and decode node;
Light amplification module: be used for the power attenuation influence that the compensated fiber transmission produces signal pulse;
Dispersion compensation module: be used for the dispersive influence that the compensated fiber transmission produces signal pulse.
Therefore; The implementation method and the device of a kind of full light ofdm signal photosphere network code provided by the invention; The compatible with single wavelength signals realizes the photosphere network code with full light ofdm signal simultaneously, and has similar structure at coding nodes and decode node, is convenient to set up universal structure.
Description of drawings
In order to be illustrated more clearly in the present invention; The accompanying drawing of required use is done simple the introduction in will describing the embodiment of the invention below; Apparently, the accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills; Do not paying under the creative work prerequisite, can also be according to the more accompanying drawing of these accompanying drawings acquisitions.
Fig. 1 is the flow chart that full light ofdm signal that one embodiment of the invention provides is realized the photosphere network coding method;
Fig. 2 is the structure chart that full light ofdm signal that one embodiment of the invention provides is realized the photosphere network coding method;
Fig. 3 be one embodiment of the invention provide generate the structure chart that full light ofdm signal produces by single wavelength signals;
Fig. 4 is the structure chart of the all-optical logic XOR module that provides of one embodiment of the invention.
Embodiment
The accompanying drawing that will combine the embodiment of the invention below carries out clear, intactly description to technical scheme in the embodiment of the invention and device.Obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to protection scope of the present invention not making the every other embodiment that is obtained under the creative work prerequisite.
Fig. 1 is the flow chart that full light ofdm signal that one embodiment of the invention provides is realized the photosphere network coding method, and as shown in Figure 1, this method comprises:
S101:, obtain A, the full light ofdm signal of B two-way at the coding nodes place;
Realize the photosphere network code to full light ofdm signal in the embodiment of the invention, suppose, can obtain two-way full light ofdm signal A and B at the coding nodes place.If when input signal A or B be full light ofdm signal, and when being single wavelength signals, can carrying out full light OFDM to signal and modulate.When promoting single wavelength signals transmission performance, guarantee the present invention compatible with single wavelength signals and full light ofdm signal simultaneously.Simultaneously, for the full light ofdm signal of two-way, require to have the number N of identical transmission rate Rbit/s and subcarrier, have R=N * r, r is the sub-carrier signal transmission rate.Two groups of subcarriers need be modulated to one group of identical orthogonal frequency f
1, f
2..., f
NOn.This requirement meets actual light Network Transmission characteristic.
S102: A, B two-way are imported full light ofdm signal be decomposed into the orthogonal sub-carriers signal respectively;
Demultiplexing module capable of using is decomposed into N road orthogonal sub-carriers signal with A, the full light ofdm signal of B two-way in the embodiment of the invention.Wherein, Demultiplexing module can select for use optical devices such as multilayer dielectric film type Wave decomposing multiplexer, waveguide grating type Wave decomposing multiplexer to realize the demultiplexing function; The output port number of demultiplexing module requires consistent with number of sub carrier wave, and choosing of other parameter of demultiplexing device should be confirmed according to the characteristic of full light ofdm signal.
S103: the pulse duration of broadening sub-carrier signal;
Because full light ofdm signal obtains via single wavelength signals serial to parallel conversion, therefore one road serial signal is transformed to the N road when walking abreast sub-carrier signal, will between signal pulse, form the space.The T of the big or small τ of gapping interval=(N-1), wherein T is a signal pulse width.For the all-optical logic XOR that will realize afterwards; Require to guarantee input signal pulse step-by-step alignment; And in the actual transmissions process; Inevitably will there be delay to a certain degree in the two-way input signal, has displacement between the respective pulses, will influence the acquisition of full light XOR correct result.Therefore, poor for the pulse daley in the certain limit that exists, through the stretched pulse width, can guarantee still can access correct all-optical logic XOR result constantly at original pulse sampling.This method has reduced the requirement of pulse step-by-step alignment, has improved paired pulses and has postponed poor tolerance.
S104: utilize all-optical logic XOR module that the same frequency sub-carrier signal of A, B two-way input ofdm signal is realized the computing of full light XOR coding;
The input signal of all-optical logic XOR module is respectively the same frequency sub-carrier signal of A, B two-way ofdm signal in the embodiment of the invention, confirms that according to number of sub carrier wave the number of all-optical logic XOR module is N, chooses N orthogonal frequency f simultaneously
C1, f
C2..., f
CNBe respectively applied for and carry the coding result of two-way with frequency sub-carrier signal XOR.
S105: sub-carrier signal is merged into new full light ofdm signal C;
Utilize Multiplexing module that each road orthogonal sub-carriers signal of the full light XOR of S104 gained is merged into new full light ofdm signal, choose multiplexing device of the same type among the S102 and realize multiplexing function.Wherein, the input port number of Multiplexing module requires consistent with number of sub carrier wave, and choosing of other parameter of multiplexing device should be confirmed according to the characteristic of full light ofdm signal.
S106: obtain B, the full light ofdm signal of C two-way at the decode node place;
New full light ofdm signal C and S101 import full light ofdm signal B and carry out corresponding decoding processing via Optical Fiber Transmission to decode node behind the S105 output encoder.
S107: B, the full light ofdm signal of C two-way are decomposed into the orthogonal sub-carriers signal respectively;
Has identical processing method with S102; Realize identical functions; Utilize demultiplexing module that B, the full light ofdm signal of C two-way are decomposed into N road orthogonal sub-carriers signal, wherein, choosing of other parameter of demultiplexing device should be confirmed according to the characteristic of the full light ofdm signal that is obtained.For the N road orthogonal sub-carriers signal frequency that guarantees B, the full light ofdm signal of C two-way is corresponding identical, with the N road orthogonal sub-carriers signal frequency of the full light ofdm signal in B road by f
1, f
2..., f
NBe modulated to f
C1, f
C2..., f
CN, separate XOR for the all-optical logic that guarantees afterwards the same frequency sub-carrier signal and prepare.
S108: the pulse duration of broadening sub-carrier signal;
Have identical processing method with S103, realize identical functions.
S109: utilize all-optical logic XOR module that the same frequency subcarrier of B, the full light ofdm signal of C two-way is realized full photodissociation XOR decoding operation;
Have identical processing method with S104, realize identical functions, confirm that according to number of sub carrier wave the number of all-optical logic XOR module is N, chooses N orthogonal frequency f simultaneously
1, f
2..., f
NBe respectively applied for and carry the coding result of two-way with frequency sub-carrier signal XOR.Utilize all-optical logic XOR module to realize decoding operation, can obtain
according to
thus realize the decoding operation of each orthogonal sub-carriers signal.
S110: the sub-carrier signal after the decoding operation is merged the full light ofdm signal A of recovery;
Have identical processing method with S105, realize identical functions, utilize Multiplexing module that each road orthogonal sub-carriers signal of the full photodissociation XOR of S109 gained is merged into full light ofdm signal, be the full light ofdm signal A of recovery.Wherein, choosing of other parameter of multiplexing device should be confirmed according to the characteristic of full light ofdm signal.
The full light ofdm signal that Fig. 2 provides for one embodiment of the invention is realized the structure chart of photosphere network coding method.The whole process of Fig. 1 flow chart has been described from function.Coding nodes has identical structural model with decode node, for unified node structure design is laid a good foundation.In a kind of device of full light ofdm signal photosphere network code; Include demultiplexing module, pulse stretching module, all-optical logic XOR module and Multiplexing module in coding nodes and decode node; Comprise light amplification module and dispersion compensation module in the Optical Fiber Transmission process, each type device concrete function and handling process are following:
The array waveguide grating that can select 1 * N for use in the embodiment of the invention is as demodulation multiplexer, and the full light ofdm signal of two-way that the Code And Decode node is obtained is decomposed into N road orthogonal sub-carriers signal.Wherein, the output port number of array waveguide grating device requires consistent with number of sub carrier wave, and choosing of frequency interval, centre frequency and bandwidth parameter should be definite according to choosing of full light ofdm signal orthogonal frequency.Orthogonal frequency f
1, f
2..., f
NBetween frequency difference be equally spaced, and Δ f=r is arranged, can accomplish the work of S102 and S107 among Fig. 1.
Pulse stretching module capable of using realizes the broadening of sub-carrier signal pulse duration in the embodiment of the invention, can accomplish the work of S103 and S108 among Fig. 1.
Select for use the logic XOR module of Mach-Zehnder interferometer (SOA-MZI) structure of semiconductor optical amplifier formation to realize all-optical logic XOR reconciliation XOR in the embodiment of the invention.Choose N orthogonal frequency and survey optical signal frequency as the input of N all-optical logic XOR module respectively; N detection light signal is respectively applied for and carries the Code And Decode result of two-way with the XOR of sub-carrier signal XOR reconciliation frequently; Need guarantee that simultaneously it also is quadrature that each road XOR is conciliate between the XOR gained detection optical signal frequency, and frequency interval Δ f=r is arranged.Can accomplish the work of S104 and S109 among Fig. 1.
Select for use the array waveguide grating of N * 1 each road orthogonal sub-carriers signal of all-optical logic XOR reconciliation XOR gained to be merged into new full light ofdm signal in the embodiment of the invention as multiplexing device; Wherein, The input port number of array waveguide grating device requires consistent with number of sub carrier wave; Choosing of frequency interval, centre frequency and bandwidth parameter should be definite according to choosing of full light ofdm signal orthogonal frequency, can accomplish the work of S105 and S11O among Fig. 1.
Realize the work of S101-S105 at the coding nodes place; Realize the work of S106-S110 at the decode node place. in the Optical Fiber Transmission process between coding nodes and decode node; There is the influence of signal power decay and chromatic dispersion, can utilizes EDFA Erbium-Doped Fiber Amplifier (EDFA) and dispersion compensating fiber (DCF) to offset corresponding influence respectively.
Fig. 3 be one embodiment of the invention provide generate the structure chart of full light ofdm signal by single wavelength signals.The single wavelength signals that with code-element period is T is handled through serial to parallel conversion, is that the serial signal of R bit/s becomes N road parallel signal by one tunnel transmission rate, utilizes fibre delay line respectively the serial signal of input to be postponed 0; T/N;, (N-1) T/N, it is every that sampling can obtain N code element simultaneously to N road parallel signal constantly at a distance from NT; The code-element period of the every road parallel signal that obtains expands to NT, and every road signal transmission rate is reduced to R/N.Under the clock signal control identical with parallel signal, produce pectination high frequency subcarriers signal by distributed Feedback (DFB) laser, by coupler carrier signal is separated, require the N sub-carrier signals frequency f that produces
1, f
2..., f
NMutually orthogonal.Utilize Mach-Zehnder modulators (MZI) that N road parallel signal is modulated on the orthogonal sub-carriers signal, form full light ofdm signal by N * 1 array waveguide grating is multiplexing again.This embodiment is a kind of means that single wavelength signals is modulated to full light ofdm signal.
Fig. 4 is the structure chart of the all-optical logic XOR module that provides of one embodiment of the invention.The present invention adopts the logic XOR module realization two-way of the Mach-Zehnder interferometer structure of semiconductor optical amplifier formation to import the all-optical logic XOR reconciliation XOR of full light ofdm signal with the frequency sub-carrier signal, thus the function of completion network code and decoding.SOA1 and SOA2 symmetry are placed on two arms up and down of interferometer, continuous probe light f
C1Resolving into two-beam through three-dB coupler, is f with wavelength respectively then
1The flashlight of two-way amplitude modulation(PAM) be injected into respectively among SOA1 and the S0A2.When the input power of flashlight during greater than the maximum linear input power of SOA; Will cause the variation of carrier density in the semiconductor optical amplifier active area; Thereby cause changing, cross-gain modulation and cross-phase modulation promptly take place through detection light intensity and the phase place of SOA.Survey the amplitude information that light will carry flashlight after through semiconductor optical amplifier, survey light through the two-way of phase modulated and in coupler, produce interference, phase modulated is transformed into amplitude modulation(PAM), thus the logic XOR of realization two paths of signals.Suppose that the input two-way is f with the frequency of frequency subcarrier
1, the detection light frequency is f
C1, via SOA-MZI all-optical logic XOR gate, it is f that the result of subcarrier logic XOR will be carried on frequency
C1Carrier wave on.For N way carrier wave, will there be N SOA-MZI all-optical logic XOR gate, guarantee that N is surveyed light frequency f
C1, f
C2..., f
CNAlso have orthogonality, and frequency interval Δ f=r is arranged.。This embodiment just realizes a kind of means of all-optical logic XOR.
The above only is preferred embodiment of the present invention, but not limitation of the present invention.Any those of ordinary skill in the art; In method and technical scope that the present invention discloses; Can make many possible variations or replacement, therefore, every content that does not break away from the inventive method;, all should be encompassed within protection scope of the present invention any simple modification and equivalent variations that above embodiment did according to technical spirit of the present invention.
Claims (9)
1. the implementation method of a full light ofdm signal photosphere network code is characterized in that may further comprise the steps:
Step 1: obtain the full light ofdm signal of two-way, as the input signal of network code node;
Step 2: utilize demultiplexing module that the full light ofdm signal of two-way is decomposited each orthogonal sub-carriers signal respectively at the coding nodes place;
Step 3: according to full light ofdm signal characteristic, do not produce under the situation of any signal cross-talk, utilize the time space that exists between each road orthogonal sub-carriers signal pulse, the width of broadening signal pulse in assurance;
Step 4: utilize all-optical logic XOR module to realize the all-optical logic XOR of two-way input ofdm signal, accomplish the network code function with sub-carrier signal frequently;
Step 5: utilize Multiplexing module that each road orthogonal sub-carriers signal of full light XOR gained is merged into new full light ofdm signal;
Step 6: through Optical Fiber Transmission, obtain the new full light ofdm signal and the full light ofdm signal of one tunnel input wherein at the decode node place, in order to realize decoding operation;
Step 7: utilize demultiplexing module that the full light ofdm signal of new full light ofdm signal and wherein one tunnel input is decomposited each orthogonal sub-carriers signal respectively;
Step 8: according to full light ofdm signal characteristic, do not produce under the situation of any signal cross-talk, utilize the time space that exists between each road orthogonal sub-carriers signal pulse, once more the pulse duration of broadening signal in assurance;
Step 9: utilize all-optical logic XOR module to realize that the new full light OFDM sub-carrier signal and the all-optical logic of the full light OFDM sub-carrier signal of one tunnel input wherein separate XOR, accomplish the network decoding function;
Step 10: utilize Multiplexing module that each road orthogonal sub-carriers signal of full photodissociation XOR gained is merged into full light ofdm signal; Recover another Lu Quanguang OFDM input signal; Decode node obtains the full light ofdm signal of two-way input simultaneously, utilizes network code thought to realize the purpose of all-optical network multicast.
2. the implementation method of full light ofdm signal photosphere network code according to claim 1 is characterized in that:
In the said step 1; When the two-way input signal is not full light ofdm signal entirely; Can carry out full light OFDM conversion to signal, realize compatibility, and one group of orthogonal frequency of the number of the subcarrier of the full light ofdm signal of two-way, subcarrier chooses to guarantee it is consistent single wavelength signals.
3. the implementation method of full light ofdm signal photosphere network code according to claim 1 is characterized in that:
In the said step 2 and 7, the output port number of demultiplexing module is consistent with number of sub carrier wave, realizes in the module that the choosing of frequency interval, bandwidth and center-frequency parameters of demultiplexing function optical device should be definite according to choosing of full light ofdm signal orthogonal frequency.
4. the implementation method of full light ofdm signal photosphere network code according to claim 1 is characterized in that:
In the said step 3 and 8; Do not produce under the situation of any signal cross-talk in assurance; Pulse can be confirmed that the purpose of pulse stretching is the accuracy of conciliating the XOR result for the all-optical logic XOR after guaranteeing by the width range of broadening by full light ofdm signal pulse duration and sub-carrier signal pulse spacing.Because possibly there is delay in the transmission of two paths of signals; When utilizing all-optical logic XOR module to realize the Code And Decode computing; The delay difference that exists between the sub-carrier signal pulse will impact the acquisition that XOR is conciliate the XOR correct result; Through the pulse duration broadening, reduced the difficulty of pulse step-by-step alignment, improved tolerance to a certain extent to the signal pulse delay difference.
5. the implementation method of full light ofdm signal photosphere network code according to claim 1 is characterized in that:
In the said step 4; The input signal of all-optical logic XOR module is that two-way is with sub-carrier signal frequently; Confirm the number N of all-optical logic XOR module according to number of sub carrier wave; Choose N orthogonal frequency simultaneously and survey optical signal frequency, be used to carry the coding result of two-way, and guarantee that between each road XOR gained signal be quadrature with frequency sub-carrier signal XOR as the input of all-optical logic XOR module.
6. the implementation method of full light ofdm signal photosphere network code according to claim 1 is characterized in that:
In the said step 5 and 10, the input port number of Multiplexing module is consistent with number of sub carrier wave, realizes in the module that the choosing of frequency interval, bandwidth and center-frequency parameters of multiplexing function optical device should be definite according to choosing of full light ofdm signal orthogonal frequency.
7. the implementation method of full light ofdm signal photosphere network code according to claim 1 is characterized in that:
In the said step 6, decay that produces in the Optical Fiber Transmission and dispersive influence respectively by light amplification module and dispersion compensation module in order to offset.
8. the implementation method of full light ofdm signal photosphere network code according to claim 1 is characterized in that:
In the said step 9; The full light OFDM sub-carrier signal of new full light OFDM sub-carrier signal that step 8 is obtained or one tunnel input carries out frequency modulation(FM); The input signal that guarantees all-optical logic XOR module is that two-way is with sub-carrier signal frequently; Identical with said step 4, confirm the number N of all-optical logic XOR module according to number of sub carrier wave, choose N orthogonal frequency simultaneously and survey optical signal frequency as the input of all-optical logic XOR module; Be used to carry the coding result of two-way, and guarantee that between each road XOR gained signal be quadrature with frequency sub-carrier signal XOR.
9. the device of a full light ofdm signal photosphere network code; Be used to realize the method for full light ofdm signal photosphere network code as claimed in claim 1; Include demultiplexing module, pulse stretching module, all-optical logic XOR gate module and Multiplexing module in coding nodes and decode node; Comprise light amplification module and dispersion compensation module in the Optical Fiber Transmission process, it is characterized in that:
Demultiplexing module:, be used for full light ofdm signal is decomposited each orthogonal sub-carriers signal at coding nodes and decode node;
Pulse stretching module: at coding nodes and decode node; According to full light ofdm signal characteristic; Do not produce under the situation of any signal cross-talk in assurance, be used for the width of broadening signal pulse, through the pulse duration broadening; Reduce the all-optical logic XOR and conciliate the difficulty that XOR paired pulses step-by-step alignment requires, will improve tolerance to a certain extent the delay difference that exists between the signal pulse;
All-optical logic XOR module: at coding nodes and decode node, be used to realize the all-optical logic XOR reconciliation XOR of two-way input ofdm signal, realize network code and decoding function with sub-carrier signal frequently;
Multiplexing module:, be used for each road orthogonal sub-carriers signal of full light XOR gained is merged into new full light ofdm signal at coding nodes and decode node;
Light amplification module: be used for the power attenuation influence that the compensated fiber transmission produces signal pulse;
Dispersion compensation module: be used for the dispersive influence that the compensated fiber transmission produces signal pulse.
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| CN103199935A (en) * | 2013-02-01 | 2013-07-10 | 北京邮电大学 | Method, device and system of network coding connection management based on optical network unit (ONU) |
| CN104640217A (en) * | 2015-01-27 | 2015-05-20 | 浙江大学 | Method for joint allocation of uplink and downlink resources of OFDMA (orthogonal frequency division multiple access) network based on network coding |
| WO2024082884A1 (en) * | 2022-10-17 | 2024-04-25 | 中兴通讯股份有限公司 | Broadband signal compensation method, apparatus, device, and storage medium |
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| CN104640217A (en) * | 2015-01-27 | 2015-05-20 | 浙江大学 | Method for joint allocation of uplink and downlink resources of OFDMA (orthogonal frequency division multiple access) network based on network coding |
| CN104640217B (en) * | 2015-01-27 | 2017-12-15 | 浙江大学 | OFDMA network up and down Resource co-allocation methods based on network code |
| WO2024082884A1 (en) * | 2022-10-17 | 2024-04-25 | 中兴通讯股份有限公司 | Broadband signal compensation method, apparatus, device, and storage medium |
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