CN102377725B - OFDM (Orthogonal Frequency Division Multiplexing) sub-carrier-based optical label processing method and optical packet switching method - Google Patents
OFDM (Orthogonal Frequency Division Multiplexing) sub-carrier-based optical label processing method and optical packet switching method Download PDFInfo
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Abstract
The invention discloses an OFDM (Orthogonal Frequency Division Multiplexing) sub-carrier-based optical label processing method. The method comprises the steps of: respectively modulating routing information onto one of sub-carriers of an OFDM frequency band of a label optical carrier with the wavelength different from that of a payload optical carrier by all nodes through which packet data pass by utilizing an OFDM modulation mode, wherein the sub-carriers used on all the nodes are different; and then, synchronously coupling with an optical label signal of a preceding node to generate an optical label of the node. The invention further discloses an OFDM sub-carrier-based optical packet switching method and a node device realizing the method. Compared with the prior art, optical label erasion and rewriting are not required in the invention, the frequency spectrum utilization efficiency of an optical label channel and the transmission efficiency of an optical payload channel can be improved, and the structure of an optical packet switching network node is simplified.
Description
Technical field
The present invention relates to technical field of optical fiber communication, be specifically related to a kind of optical label processing method and light grouping exchange method based on OFDM subcarrier.
Background technology
Along with the tremendous growth of telecommunications data traffic, optical packet switch network (OPS) receives increasing concern in recent years.In order to meet bandwidth requirement and the high utilization ratio of following high-speed communication, OPS can provide based on multi-wavelength, the light transmitted in packets of little exchange granularity.Optical label switching technology (OLS) is an important technology in light packet switching, is also based on state-of-the art, to all-optical packet switching technology transition.The optical label signal that carries routing iinformation is separated and transmitted with the load signal that carries business datum, like this in the time that node exchanges processing, only need to process optical label signal, and not need whole optical packet signal to process, reduce the processing pressure of node.
Optical label exchange mainly comprises that optical label extracts, and processes, and wipes and rewrites.The optical label treatment technology scheme proposing at present mainly comprises serial code, subcarrier multiplexing, and wavelength multiplexing and quadrature modulation etc. are several.Serial code technical scheme needs strict time point detection technique, and has taken load path, has reduced bandwidth availability ratio.Subcarrier multiplexing scheme does not occupy bearer channel, but the raising of meeting limit load speed, and increased radio-frequency (RF) mixer part at node.Wavelength multiplexing technical scheme is easy to be subject to dispersive influence, makes optical label asynchronous with light payload.These technical schemes are carrying out optical label when exchange, all need to carry out wiping and the re-writing step of optical label of optical label, have increased the complexity of system.
Orthogonal frequency division multiplexi (OFDM) is a kind of modulation technique of spectral efficient, in the 4th Generation Mobile Communication System, is widely used.In recent years, due to the spectral efficient of OFDM modulation technique and good resisting chromatic dispersion ability, in optical communication system, obtained gradually research widely.Current research mainly concentrates on long distance, the optical OFDM system transmission of large capacity and spectral efficient.In addition, can pass through to use OFDM technology light modulated label signal, thereby produce the optical label signal based on OFDM.But this has just increased the availability of frequency spectrum of optical label channel, and in the time that node carries out optical label exchange, still need complicated light label scraping and rewrite process.There is researcher to propose to use different radio frequency frequency, multiple OFDM optical label signals are carried on optical packet signal, in fact be equivalent to the subcarrier multiplexing of multiple OFDM optical label signals, although can avoid light label scraping and rewrite process, but each node need to increase the device of a large amount of different radio frequency frequencies, and total optical label signal has taken a large amount of band resources, limit the increase of rate of loading, do not make full use of the technical advantage of OFDM orthogonal sub-carriers.
Summary of the invention
Technical problem to be solved by this invention is to overcome the deficiencies in the prior art, a kind of optical label processing method and corresponding light grouping exchange method based on OFDM subcarrier is provided, the method does not need to carry out wiping with optical label of optical label and rewrites, and can improve the efficiency of transmission of spectrum utilization efficiency and the light payload channel of optical label channel, simplify the structure of optical packet switch network node.
The present invention is specifically by the following technical solutions:
A kind of optical label processing method based on OFDM subcarrier, grouped data each node of process utilize respectively OFDM modulation system that routing iinformation is modulated at payload light carrier and is had on one of them subcarrier of OFDM frequency band of label light carrier of different wave length, the subcarrier that each node uses is different; Then synchronize and be coupled with the optical label signal of last node, generate the optical label signal of this node.
Based on a light grouping exchange method for OFDM subcarrier, comprise the following steps:
In optical label processing unit, the
iindividual network node routing iinformation is modulated at of OFDM frequency band
ion individual subcarrier, and electric ofdm signal is modulated to light carrier
upper formation
ithe optical routing signal of individual network node, by
ithe optical routing signal of individual network node is through time delay control with after the former optical label signal that light grouping, filtering obtains is synchronizeed, and coupling forms the new optical label signal of this node;
In controlled processing unit, through opto-electronic conversion and OFDM demodulation, extract in ofdm signal the
irouting iinformation on-1 subcarrier, according in optical label signal
ion-1 subcarrier routing iinformation, control optical switch matrix state, light payload signal is sent to correct output port;
Step 3, at output port, the optical label signal that this node is new and light payload signal form new optical packet signal, continue in network, transmit.
A kind of for realizing the node apparatus of above-mentioned light grouping exchange method, this node apparatus comprises: the optical filter with input port and first, second output port, there is the optical branching device of input port and first, second output port, light OFDM receiver, control processing module, first, second fiber delay line, first, second coupler, optical switch matrix, light OFDM transmitter, the first output port of optical filter is connected with the input port of optical branching device, the second output port of optical filter is connected with one end of optical switch matrix through the second fiber delay line, the first output port of optical branching device is connected with an input of the first coupler, the second output port of optical branching device is connected with control processing module through light OFDM receiver, controlling processing module is electrically connected and it is controlled with the control end of optical switch matrix, the output of light OFDM transmitter is connected with another input of the first coupler by the first fiber delay line, the output of the first coupler is connected with two inputs of the second coupler respectively with the other end of optical switch matrix.
A kind of optical packet switch network, comprises the multiple network nodes that connect by optical fiber, and described network node is above-mentioned node apparatus.
Compared to existing technology, the present invention has following beneficial effect:
1, in the time of optical packet signal process network node, not needing to carry out wiping with optical label of optical label rewrites, only the optical label signal of this node need be synchronizeed and the new optical label signal of formation that is coupled with the former optical label signal receiving in light grouping, simplify the system configuration of network node.
2, optical label signal uses OFDM modulation system, and the routing iinformation of each network node only occupies a subcarrier in ofdm signal, has improved the spectrum utilization efficiency of optical label channel.
3, optical label signal is on different wavelength from light payload signal, and this makes separating of optical label and light payload very simple, only needs a filter, and has improved the efficiency of transmission of light payload channel.
4, ofdm signal has good dispersion compensation and nonlinear effect inhibition in the time of long Distance Transmission, and dispersion compensation is to complete by the channel estimating of receiving terminal and equilibrium, therefore do not need additionally to increase optical dispersion compensation device optical label channel is compensated, reduced the design complexities of network.
Accompanying drawing explanation
Fig. 1 is the structure principle chart of node apparatus of the present invention;
Fig. 2 is
ithe optical label process chart of individual network node;
Fig. 3 is
ithe spectrum diagram of individual network node output optical packet signal;
Fig. 4 is the optical label signal in embodiment, and wherein (a) is the optical routing signal graph of second network node in embodiment, is (b) the optical routing signal graph of the 4th network node in embodiment;
Fig. 5 is the signal graph of light grouping and optical label in embodiment, and wherein (a) is the optical label signal that in embodiment, light divides into groups
x m , (b) be the optical label signal of receiving terminal in embodiment
y k .
Embodiment
Below in conjunction with accompanying drawing, technical scheme of the present invention is elaborated:
Thinking of the present invention is: for optical packet switch network, each network node is only modulated at the routing iinformation of this node on a subcarrier of OFDM, rather than occupies whole subcarriers of OFDM, thereby effectively improves the spectrum utilization efficiency of optical label channel.Optical label signal in light grouping is from load signal in different optical wavelength, and optical label signal does not affect the transmission of load signal, and can extract easily optical label signal by filter.
In order to implement the inventive method, design node apparatus as shown in Figure 1, as shown in the figure, this node apparatus comprises the port with A, the optical filter 1 of B port and C port, with a port, the optical branching device 2 of b port and c port, light OFDM receiver 3, control processing module 4, fiber delay line 5.1, fiber delay line 5.2, coupler 6.1, coupler 6.2, optical switch matrix 7, light OFDM transmitter 8, the B port of optical filter 1 is connected with a port of optical branching device 2, the C port of optical filter 1 is connected with one end of optical switch matrix 7 through fiber delay line 5.2, the b port of optical branching device 2 is connected with an input of coupler 6.1, the c port of optical branching device 2 is connected with control processing module 4 through light OFDM receiver 3, controlling processing module 4 is electrically connected with optical switch matrix 7 and optical switch matrix 7 is controlled, the output of light OFDM transmitter 8 is connected with another input of coupler 6.1 by fiber delay line 5.1, the other end of the output of coupler 6.1 and optical switch matrix 7 is connected with two inputs of coupler 6.2 respectively.
Grouped data enters from the A port of optical filter 1, after filtering after, optical label signal is from the B port output of optical filter 1.And light payload signal is from the C port output of optical filter 1, enter optical switch matrix 7 through fiber delay line 5.2.Optical label signal is entered by a port of optical branching device 2, part optical label signal is exported from b port, and the optical routing signal of i the network node producing with light OFDM transmitter 8, form the new optical label signal of this node by coupler 6.2 couplings, wherein the optical routing signal of i network node, by the suitable time-delay control of fiber delay line 5.1, keeps strictly synchronizeing with the former optical label signal of b port output.Part optical label signal, from c port output, enters light OFDM receiver 3 and carries out opto-electronic conversion and OFDM demodulation process, and in processing module 4, extracts the controlling
ion-1 subcarrier routing iinformation, and produce control signal the state of optical switch matrix 7 is controlled, thereby light payload signal is sent to correct output port, and this node optical label signal of being exported by coupler 6.1 and light payload signal form new light grouped data by coupler 6.2 and resume defeated in network trunk.
Multiple above-mentioned node apparatus connect by optical fiber, form optical packet switch network.In this network, light packet switching specifically in accordance with the following methods:
In optical label processing unit, the
iindividual network node routing iinformation is modulated at of OFDM frequency band
ion individual subcarrier, and electric ofdm signal is modulated to light carrier
upper formation
ithe optical routing signal of individual network node, by
ithe optical routing signal of individual network node is through time delay control with after the former optical label signal that light grouping, filtering obtains is synchronizeed, and coupling forms the new optical label signal of this node;
In controlled processing unit, through opto-electronic conversion and OFDM demodulation, extract in ofdm signal the
irouting iinformation on-1 subcarrier, according in optical label signal
ion-1 subcarrier routing iinformation, control optical switch matrix state, light payload signal is sent to correct output port;
Step 3, at output port, the optical label signal that this node is new and light payload signal form new optical packet signal, continue in network, transmit.
?
iindividual network node output port, the new optical label signal in optical packet signal, is the optical routing signal by the 1st network node, the optical routing signal of the 2nd network node ..., the optical routing signal of i network node forms jointly.It is strict synchronous that the optical routing signal of each network node of composition optical label signal all keeps.
Fig. 3 is
ithe spectrum diagram of individual network node output port optical packet signal.Optical label signal is at wavelength
place, light payload signal is at wavelength
place, both form optical packet signal and transmit in optical packet switch network.The routing iinformation of the 1st network node, the routing iinformation of the 2nd network node ..., the
ithe routing iinformation of individual network node is in respectively the 1st of OFDM frequency band, and the 2nd ..., the
ion individual subcarrier.
Traditional multi-carrier modulation is the band-limited signal based on non-overlapped, by realizing with a large amount of oscillators and filter at transmitting terminal and receiving terminal.In order to guarantee the validity of filter and oscillator design, we must make channel spacing much larger than symbol transmission bandwidth, and this just makes multi-carrier modulation need to take too much frequency bandwidth, has reduced band efficiency.In order to address this problem, OFDM is that OFDM technology is suggested, but the mutually orthogonal signal group of this utilization spectrum overlapping, if any two subcarriers satisfy condition
Wherein
f 1 with
f 2 for the frequency of subcarrier,
t s refer to symbol period,
mfor positive integer.These two subcarriers are just mutually orthogonal so, and this just means, if the orthogonal sub-carriers group of the integral multiple of frequency interval is-symbol cycle inverse can be recovered by matched filter.Although signal spectrum is overlapping serious, lack the interference of not introducing intercarrier.1971, first Weinstein proposed to utilize discrete fourier inverse transformation (IDFT)/discrete Fourier transform (DFT) to realize the method for OFDM modulating/demodulating.Use IDFT to realize the concrete form of OFDM modulation as follows:
Wherein
n sc represent number of sub carrier wave,
x k represent the
kdata message on individual subcarrier,
x m represent the of resultant signal after all subcarrier-modulated stack
mindividual sampling, sampling time interval is
t s /
n sc .The form of OFDM demodulation is accordingly:
In the present invention, suppose
ithe routing iinformation data of individual network node are
x (i) k ,
krepresent the
kindividual subcarrier.Because the
ithe routing iinformation of individual network node is only carried in
ion individual subcarrier, the data on other subcarriers are 0.So and if only if
k=itime,
x (i) k ≠ 0.After OFDM modulation, the optical routing signal of i network node
x (i) m for:
Wherein N is number of sub carrier wave.All nodes all adopt identical sub-carrier number and IDFT/DFT computing length.?
ithe output port of individual network node, optical label signal be by
x (1) m ,
x (2) m ...,
x (i) m common composition, in the time that each node optical label signal keeps synchronous, can obtain:
Signal after OFDM demodulation
y k for:
As can be known from the results, the signal obtaining after OFDM demodulation
y k for
x (1) k + X (2) k +...
+ X (i) k .Receive of signal
kdata on individual subcarrier are in all-network node-routing information
kdata on individual subcarrier and.From subcarrier modulation modes, when
k=1 o'clock, only have
x (1) k there is data message, other
x (2) k , X (3) k ,...
, X (i) k be 0,
y k =X (1) k .Similar working as
k=itime,
y k =X (i) k .So from receiving signal
y k different sub carrier on can obtain the routing iinformation of corresponding network node, realize the optical label processing method based on OFDM subcarrier proposed by the invention.
Suppose that the number of subcarriers in the OFDM frequency band of optical label signal is that 16, DFT computing length is 16, adopt BPSK modulation, the routing iinformation of second network node is
x (2) k =(0 10000000000000 0), only on second subcarrier, data are 1, on other subcarriers, are 0.Similar, the 4th network node
x (4) k =(0 00100000000000 0).After OFDM modulation, the optical label signal of second network node generation is
x (2) m , the optical label signal of the 4th network node generation is
x (4) m , as Fig. 4 (a) with (b).The optical label signal of light grouping in the present embodiment
x m by
x (2) m with
x (4) m stack forms and transmits, and carries out OFDM demodulation at receiving terminal, obtains receiving signal
y k =(0 10100000000000 0), as Fig. 5 (a) with (b).Can find, from receiving second of signal and the 4th subcarrier, can obtain the routing iinformation of corresponding second and the 4th network node.
Claims (4)
1. the optical label processing method based on OFDM subcarrier, it is characterized in that, grouped data each node of process utilize respectively OFDM modulation system that routing iinformation is modulated at payload light carrier and is had on one of them subcarrier of OFDM frequency band of label light carrier of different wave length, the subcarrier that each node uses is different; Then synchronize and be coupled with the optical label signal of last node, generate the optical label signal of this node, specific as follows: first by optical filter, optical label signal to be extracted; The optical label signal extracting is divided into two parts through optical splitter, enters respectively optical label processing unit and controlled processing unit; Light payload signal through certain time-delay laggard enter optical switch matrix; In optical label processing unit, the
iindividual network node routing iinformation is modulated at of OFDM frequency band
ion individual subcarrier, and electric ofdm signal is modulated to light carrier
upper formation
ithe optical routing signal of individual network node, by
ithe optical routing signal of individual network node is through time delay control with after the former optical label signal that light grouping, filtering obtains is synchronizeed, and coupling forms the new optical label signal of this node;
i=2,3,4 ..., N, N represents the light intermediate node quantity that will pass through of dividing into groups.
2. the light grouping exchange method based on OFDM subcarrier, is characterized in that, comprises the following steps:
Step 1, in the time that grouped data enters optical packet switch network, the routing iinformation in grouped data is modulated on first subcarrier of ofdm signal, and this ofdm signal that carries packet routing information is modulated to light carrier
upper formation optical label signal; Load data in grouped data is modulated to the light carrier of another wavelength
upper formation light payload signal; Light payload signal and optical label signal composition optical packet signal, and transmit in optical packet switch network;
Step 2, when optical packet signal is by the
iwhen individual network node,
i=2,3,4 ..., N, N represents the light intermediate node quantity that will pass through of dividing into groups, and first by optical filter, optical label signal is extracted; The optical label signal extracting is divided into two parts through optical splitter, enters respectively optical label processing unit and controlled processing unit; Light payload signal through certain time-delay laggard enter optical switch matrix;
In optical label processing unit, the
iindividual network node routing iinformation is modulated at of OFDM frequency band
ion individual subcarrier, and electric ofdm signal is modulated to light carrier
upper formation
ithe optical routing signal of individual network node, by
ithe optical routing signal of individual network node is through time delay control with after the former optical label signal that light grouping, filtering obtains is synchronizeed, and coupling forms the new optical label signal of this node;
In controlled processing unit, through opto-electronic conversion and OFDM demodulation, extract in ofdm signal the
irouting iinformation on-1 subcarrier, according in optical label signal
irouting iinformation on-1 subcarrier, controls optical switch matrix state, and light payload signal is sent to correct output port;
Step 3, at output port, the optical label signal that this node is new and light payload signal form new optical packet signal, continue in network, transmit.
3. one kind for realizing the node apparatus of light grouping exchange method described in claim 2, it is characterized in that, this node apparatus comprises: the optical filter with input port and first, second output port, have the optical branching device of input port and first, second output port, light OFDM receiver, controls processing module, first, second fiber delay line, first, second coupler, optical switch matrix, light OFDM transmitter, the first output port of optical filter is connected with the input port of optical branching device, the second output port of optical filter is connected with one end of optical switch matrix through the second fiber delay line, the first output port of optical branching device is connected with an input of the first coupler, the second output port of optical branching device is connected with control processing module through light OFDM receiver, controlling processing module is electrically connected and it is controlled with the control end of optical switch matrix, the output of light OFDM transmitter is connected with another input of the first coupler by the first fiber delay line, the output of the first coupler is connected with two inputs of the second coupler respectively with the other end of optical switch matrix.
4. an optical packet switch network, comprises the multiple network nodes that connect by optical fiber, it is characterized in that, described network node is node apparatus described in claim 3.
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| CN111585655B (en) * | 2020-04-13 | 2021-07-06 | 烽火海洋网络设备有限公司 | Remote interactive control system and method for subsea equipment |
| CN112636866B (en) * | 2020-12-31 | 2023-12-15 | 武汉邮电科学研究院有限公司 | Wavelength label generation method and device and detection method and device |
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