CN104503187B - Calibrating and signal correction reconstruction method for time-wavelength interweaving optical analog-to-digital conversion - Google Patents
Calibrating and signal correction reconstruction method for time-wavelength interweaving optical analog-to-digital conversion Download PDFInfo
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Abstract
The invention discloses a calibrating and signal correction reconstruction method for time-wavelength interweaving optical analog-to-digital conversion, and aims at improving significant bits of an optical analog-to-digital conversion system. The method involves two pars which are performed in a sequence, namely, parameter calibration and correction; the system parameter calibration is that a known signal is sampled through the system, and the inter-channel gain non-uniformity parameters, cosine parameters and modulator wavelength correlation parameters can be extracted by analyzing the sampling result, so as to calibrate each system parameter; the correction is that the system calibrated parameters are used for correcting and reconstructing the sampling result of an actual signal to inhibit various noises of the system so as to obtain relatively high signal-to-noise ratio. With the adoption of the method, the inter-channel gain non-uniformity parameters, cosine parameters and modulator wavelength correlation parameters of the system can be extracted and calibrated so as to facilitate special correction; the time sequence bias and gain can be calibrated and adjusted to obtain the system parameters for correcting the signal so as to inhibit various noises of the system; therefore, the significant bit numbers of the signal can be improved and relatively high signal-to-noise ratio can be obtained.
Description
Technical field
The present invention relates to a kind of time wavelength-interleaved optical analog to digital conversion is demarcated and signal reconfiguring method, specifically using known
Standard signal calibration system parameter, and then the sampled result to actual signal is corrected reconstruct.
Background technology
Analog-digital converter (analog-to-digital converter, ADC) is that analogue signal is switched to digital signal
Device.Most signals in nature are all in the form of analogue signal, and current signal processing technology is mostly adopted
With Digital Signal Processing (digital signal processing, DSP).Therefore, analog-digital converter is areas of information technology
One of core device.
Requirement of the development in the fields such as communication, radar to analog-digital converter bandwidth and quantified precision also more and more higher.In recent years
Come, the performance of electric analog-digital converter has also been had a great development (referring to Jonsson B E.A survey of A/D-
converter performance evolution[C]//Electronics,Circuits,and Systems(ICECS),
201017th IEEE International Conference on.IEEE,2010:766-769).But due to " electronics bottle
Neck " is (referring to Walden R H.Performance trends for analog to digital converters [J]
.Communications Magazine,IEEE,1999,37(2):Presence 96-101), electric performance of analog-to-digital convertor enter one
Step is lifted has very big difficulty.
The characteristics such as the high bandwidth of Photonics Technology, high stable can be efficiently against problem above.Based on Photonics Technology
Optical analog to digital conversion device become realize at a high speed, the effective way of high precision analogue conversion, cause the height of domestic and international research institution
Degree concern.Time wavelength-interleaved optical analog to digital conversion is (referring to MARC CURRIE, High-Performance Photonic
Analog-to-Digital Converter and Low-Noise Mode-Locked Fiber Lasers.May 26,
2003) it is a kind of typical optical analog to digital conversion scheme, the sample rate of system, but width can be greatly improved using this multiplex technique
Degree, interchannel inhomogeneities, the non-linear raising for limiting its quantified precision.
Propose based on the phase place using dual-port intensity modulator to improve quantified precision, Twichell.J.C et al.
Encoding scheme, make use of the complementarity of the output of manipulator two reduce the amplitude jitter of mode-locked laser impact (referring to
Twichell J C,Wasserman J L,Juodawlkis P W,et al.High-linearity208-MS/s
photonic analog-to-digital converter using 1-to-4optical time-division
demultiplexers[J].Photonics Technology Letters,IEEE,2001,13(7):714-716.)。MIT
Interchannel concordance is improved using integreted phontonics technology.But due to the restriction of prior art and technique, merely from hardware angle
To improve, there is very big difficulty in quantified precision to degree and cost is very high.
Data processing is another important channel for improving optical analog to digital conversion device precision.Juodawlkis P W et al. are proposed
By anticosine computing correct M-Z intensity modulators nonlinear response (referring to Juodawlkis P W, Twichell J C,
Betts G,et al.Optically sampled analog-to-digital converters[J].Microwave
Theory and Techniques,IEEE Transactions on,2001,49(10):1840-1853).KHILO A etc. are carried
Go out the adaptive error compensation method based on numerical computations (referring to KHILO A, BIRGE J R, KARTNER F X.Adaptive
error compensation for photonic analog-to-digital converters[C].CLEO 2008.New
Jersey:IEEE,2008,544-545.).Auspicious bright etc. the proposing of god a kind of is turned by demarcating correction time wavelength-interleaved light modulus
(, Wu Testudiniss spirit auspicious bright referring to god, Li Siqi, in optical analog to digital conversion system, amplitude is not or not the method for the static margin inhomogeneities in changing
The correction of uniformity, optical transport technology, 2011.1).But there is presently no and solve the concrete of manipulator wavelength dependence impact
Scheme, the also signal reconfiguring method for time wavelength-interleaved optical analog to digital conversion of no complete set.
The content of the invention
The present invention is based on existing time wavelength-interleaved optical analog to digital conversion system, on the basis of the system, for upper
State problem and the deficiencies in the prior art, it is proposed that a kind of complete time wavelength-interleaved optical analog to digital conversion signal weight based on demarcation
Structure method.System is demarcated by the spectrum analyses to standard signal sampled result, obtain calibrating parameters；And then using mark
Determine that parameter is corrected to the result of spot sampling, High precision reconstruction goes out to be sampled signal.
The signal reconfiguring method of time wavelength-interleaved optical analog to digital conversion system proposed by the present invention includes system parameter calibration
With two parts of signal reconstruction：
Described system parameter calibration refers to that system is sampled to a known standard signal, by sampled result
Analysis extracts interchannel gain inequality parameter, cosine parameter, manipulator wavelength dependence parameter etc., used as the mark of system
Determine parameter.
Described signal reconstruction is referred to using the calibrating parameters of system parameter calibration process acquisition to being actually sampled signal
Sampled result be corrected, High precision reconstruction is sampled signal.
The system parameter calibration part comprises the following steps that：
1st, choose single-frequency cosine signal signal input optical analog to digital conversion device is sampled as standard.Frequency f of standard signalin
Should be less than the single pass nyquist frequency of system；
2nd, the demarcation of time skewed：Output to each passage of time wavelength-interleaved optical analog to digital conversion system carries out Fourier's change
Change, observe phase spectrum, it is f to obtain being input into standard signal frequencyinWhen each passage sampling pulse phase place, as relative to standard
Phase offset θ that the time delay of sine wave causesi.Take and remember that its phase offset is θ for the first reference channel all the way1, obtain i-th and lead to
Time migration scalar quantity between road and the first reference channelThen, the time delay of i-th passage is entered
Row is corresponding to be adjusted, and adjusted value is Δ ti, obtain the sampled result of interchannel sequential alignment.
3rd, interchannel biasing and the demarcation of amplitude inhomogeneities：Fourier's frequency is done to each channel sample result of sequential alignment
Analysis of spectrum obtains power spectrum.Signal amplitude A of DC position in the power spectrum of each passageiFor the biasing of corresponding i-th passage
Scalar quantity.Amplitude B at power spectrum Plays signal frequencyiFor the gain calibration amount of corresponding i-th passage；Wherein to make all the way
For the second reference channel, scalar quantity A is biased with which0With gain calibration amount B0On the basis of, first gain calibration amount B to other passagesi
Carry outAdjustment, then the biasing A to other passagesiCarry outAdjustment, each channel signal after adjustment is defeated
Enter modulator parameter demarcating module.
4th, the demarcation of modulator parameter, biasing that the demarcation and wavelength dependence for being divided into cosine parameter causes and amplitude are not
Uniformity is demarcated：
1. the demarcation of electro-optic intensity modulator cosine parameter：Using the method for binary search, first 1 × 10-5～100 ×
10-5In the range of choose a big step-length scan for, the tool of step-length is determined according to the relation of cosine parameter error and step-size in search
The body range of choice；Then, it is determined that the step-length range of choice in, with little step-size in search choose cosine parameter.By each passage
Signal carries out anticosine computing divided by the cosine parameter chosen, and calculates the SFDR of anticosine operation result
(SFDR).Finally, the maximum cosine parameters of SFDR are chosen as cosine parameter calibration amount.By the signal of each passage divided by correspondence
Cosine parameter calibration amount, make anticosine computing, obtain anticosine correction after each channel data.
2. manipulator wavelength dependence causes biasing and the demarcation and adjustment of amount of gain：It is each logical after to anticosine correction
Track data does Fourier spectrum analysis and obtains power spectrum.Take the size of DC position signal amplitude in the power spectrum of the i-th paths
As the biasing scalar quantity a of signali, gain calibration of the size of signal amplitude as signal at the paths standard signal frequency
Amount bi.It is the 3rd reference channel all the way to take certain, demarcates partially the amount of putting a with which0With gain calibration amount b0On the basis of, first to except the 3rd ginseng
Examine gain calibration amount b of other passages outside passageiCarry outAdjustment, then the biasing scalar quantity a to respective channeliEnter
OKAdjustment, correct the discordance of the biasing that causes of manipulator wavelength dependence and gain.
After above-mentioned demarcation flow process obtains the systematic parameter required for signal correction, you can carry out the correction weight of signal
Structure, signal correction reconstruct part comprises the following steps that：
1st, inter-channel time skew correction：Using the time migration scalar quantity Δ t of each channeli, with the first reference chosen
Time adjustment is carried out on the basis of passage to each channel sample result, correction time deflection obtains the data of sequential alignment.
2nd, passage biasing and gain inequality correction：Each channel data after sequential is alignd is multiplied by the increasing of respective channel
Ratio (the B of beneficial scalar quantity and the second reference channel gain calibration amount0/Bi), the gain inequality between correction channel；To increase again
The i-th channel data after beneficial inhomogeneity correction plus the second reference channel biasing scalar quantity carried out after gain ratio adjustment with
The difference of the biasing scalar quantity of respective channelBiasing inhomogeneities between correction channel；Obtain final product after adjustment
To the channel signal that biasing and gain have been corrected.
3rd, the correction of manipulator cosine response：By each channel data divided by corresponding cosine parameter calibration amount, then carry out anti-
Cos operation, corrects manipulator cosine response.
4th, manipulator wavelength dependence correction：The biasing scalar quantity calibrated by the 3rd canonical reference passage according to choosing
a0With gain calibration amount b0On the basis of, the first gain to other passages is carried outAdjustment, then the biasing of the paths is carried outAdjustment, to gain and biasing be corrected adjustment after obtain signal correction reconstruct.
Compared with prior art, the invention has the beneficial effects as follows：
Demarcated so as to be conducive to targetedly correcting by the various parameters to system, obtain carrying out signal correction
The various noises of system just can be pressed down by the parameter demarcated by required systematic parameter when sampling to actual signal
System, is exported after being adjusted correspondingly in data reconstruction, is completed the whole to system and is corrected.Signal can be improved
Significant bit digit, obtain higher signal to noise ratio.
Description of the drawings
Fig. 1 is based on time wavelength-interleaved optical analog to digital conversion system calibrating flow chart for the present invention.
Fig. 2 is based on time wavelength-interleaved optical analog to digital conversion system compensation flow chart for the present invention.
Specific embodiment
A specific embodiment of the present invention is given below in conjunction with the accompanying drawings.Before the present embodiment is the technical scheme is that
Carry and being implemented, give detailed embodiment and process.But protection scope of the present invention is not limited to following embodiments.
Fig. 1 is based on time wavelength-interleaved optical analog to digital conversion system calibrating flow chart for the present invention.The single pass sampling of system
Rate is fs.In calibration process, first by frequency be fcSystem single channel nyquist frequency f is less than (s/ single-frequency cosine signal 2)
The sampled data that signal input system obtains each passage is sampled as standard.Then the output to i-th passage is carried out in Fu
Leaf transformation, observes phase spectrum, obtains in corresponding input microwave signal frequency fcWhen phase place, as relative to standard sine wave
Phase offset θ that time delay causesi, take and remember that its phase offset is θ for the first reference channel all the way1, obtain i-th passage and first
Time migration scalar quantity between reference channelΔ t is carried out to the time delay of i-th passage againiTune
It is whole, obtain the sampled result of interchannel sequential alignment；The each channel sample result alignd to sequential does Fourier spectrum analysis
Power spectrum is obtained, signal amplitude A of DC position in the power spectrum of each passageiFor the biasing scalar quantity of the i-th passage of correspondence, work(
Amplitude B at rate spectrum Plays signal frequencyiFor the gain calibration amount of the i-th passage of correspondence；Using wherein all the way as the second reference
Passage, biases scalar quantity A with which0With gain calibration amount B0On the basis of, the first increasing to other passages in addition to the second reference channel
Beneficial scalar quantity BiCarry outAdjustment, then to carrying out the biasing scalar quantity A of the respective channel after Gain tuningiCarry outAdjustment, each channel signal input modulator parameter calibration module after adjustment.
Then the demarcation of device parameter is modulated, is divided into the demarcation and the biasing caused to wavelength dependence of cosine parameter
With demarcation two parts of gain inequality：
Using the method for binary search, first 1 × 10-5～100 × 10-5In the range of choose a big step-length searched
Rope, determines the selectable range of step-length according to the relation of cosine parameter error and step-size in search.Then it is determined that step-length select
In the range of, cosine parameter is chosen with little step-size in search；By the signal of each passage divided by the cosine parameter chosen, anticosine is carried out
Computing.For sample rate is fs, signal bandwidth is fBSignal, calculate anticosine operation result SFDR(wherein N is the digit of preferable ADC), chooses the maximum cosine of SFDR
Parameter is used as cosine parameter calibration amount.By the signal of each passage divided by corresponding cosine parameter calibration amount, make anticosine computing, obtain
Each channel data to after anticosine correction；
Fourier spectrum analysis is done to each channel data and obtains power spectrum, take DC position width in the power spectrum of the i-th passage
Biasing scalar quantity a of the size of degree as signali, at the i-th paths standard signal frequency, the size of signal amplitude is signal
Gain calibration amount bi, it is the 3rd reference channel all the way to choose certain, biases scalar quantity a with which0With gain calibration amount b0On the basis of, first
Gain calibration amount b to other passages in addition to the 3rd reference channeliCarry outAdjustment, then the biasing to respective channel
Scalar quantity aiCarry outAdjustment, correct the biasing that causes of manipulator wavelength dependence and gain discordance.
Fig. 2 is based on time wavelength-interleaved optical analog to digital conversion system compensation flow chart for the present invention.As seen from the figure by Fig. 1
After having obtained carrying out in shown demarcation flow process the systematic parameters such as gain required for signal correction, biasing, to actual letter
During number sampling just can by demarcate the parameters such as gain of the similar calculating of flow process to system, biasing and be corrected,
So as to reach the suppression to noise：
For sampled result is first with the time skewed Δ t between the different passages demarcated in signal scaling stepi,
Δ t is carried out to rest channels on the basis of the first reference channel choseniAdjustment, correction time deflection obtain sequential alignment
Data；Then with the biasing scalar quantity A of the second selected reference channel0With gain calibration amount B0On the basis of, will first remove second and join
The the i-th paths data for examining passage are multiplied by the gain calibration amount of respective channel and the ratio of the second reference channel gain calibration amount
(B0/Bi), the gain inequality between correction channel；Again by the paths data plus carry out after amplitude ratio adjustment the
The difference of the biasing scalar quantity of two road reference channel biasing scalar quantities and respective channelIt is inclined between correction channel
Put inhomogeneities；The channel signal that bias and gain corrected is obtained after adjustment；
Subsequently into the correction module of modulator parameter, first by each channel data divided by more than demarcating and being demarcated in flow process
String parameter, then anticosine computing is carried out, the signal for now obtaining has eliminated interchannel inhomogeneities, further according to the 3rd for choosing
The biasing scalar quantity a calibrated by reference channel0With gain calibration amount b0The biasing of the passage brought by manipulator wavelength dependence
Corrected with gain inequality accordingly：The first gain to removing the i-th paths of the 3rd reference channel is carried outTune
It is whole, then the biasing of the passage is carried outAdjustment；Manipulator is completed after being corrected to gain and biasing
Partial adjustment, you can whole corrections of complete paired systems.
Claims (2)
1. a kind of time wavelength-interleaved optical analog to digital conversion is demarcated and signal correction reconstructing method, including parameter calibration and correction reconstruct
Two stages：
The parameter calibration stage：By the sampling to a known signal, and interchannel increasing is extracted from the analysis of sampled result
Beneficial inhomogeneities parameter, cosine parameter, manipulator wavelength dependence parameter, as calibrating parameters；
Correction reconstruction stage：Reconstruct is corrected to the sampled result of actual signal using calibrating parameters；Characterized in that,
In the described parameter calibration stage, comprise the following steps that：
1. for the signal of input time wavelength-interleaved optical analog to digital conversion system, choose known to single-frequency cosine signal as being adopted
Sample signal, i.e. standard signal, input light analog-digital converter；Frequency f of standard signalinLess than the Nai Kui in calibration system single channel
This distinct frequence；
2. the demarcation of time skewed：Output to each passage in time wavelength-interleaved optical analog to digital conversion system carries out Fourier's change
Change, observe phase spectrum, it is f to obtain in input standard signal frequencyinWhen sampling pulse phase place, i.e., relative to sine wave when
Prolong phase offset θ for causingi；It is the first reference channel all the way to take, and remembers that its phase place is θ1, i-th passage and first is obtained with reference to logical
Time migration scalar quantity between roadThen the time delay of i-th passage is adjusted accordingly, adjusted value
For Δ ti, obtain the sampled result of interchannel sequential alignment；
3. interchannel biasing and the demarcation of gain inequality：Fourier spectrum is done to the sampled result of interchannel sequential alignment
Analysis obtains power spectrum, signal amplitude A of DC position in the power spectrum of each passageiFor the biasing mark of corresponding i-th passage
Quantitatively, amplitude B of power spectrum Plays frequency signaliFor the gain calibration amount of corresponding i-th passage；Take wherein all the way as
Two reference channels, bias scalar quantity A with which0With gain calibration amount B0On the basis of, first to other passages in addition to the second reference channel
Gain calibration amount BiThe amount of being adjusted isAdjustment, then the biasing to carrying out the respective channel after Gain tuning carries outAdjustment, each channel signal input modulator parameter calibration module after adjustment；
4. the demarcation of modulator parameter, the demarcation and the biasing caused to wavelength dependence and gain for being divided into cosine parameter are uneven
The demarcation of even property：
The cosine parameter of electro-optic intensity modulator is demarcated first, using twice searching methods, first 1 × 10-5～100 × 10-5
In the range of select big step-length to scan for, according to the relation of cosine parameter error and step-size in search confirm step-length specifically chosen model
Enclose；Then, it is determined that the parameter range of choice in little step-length choose cosine parameter, by the signal of each passage divided by choose
Cosine parameter, carries out anticosine computing, and calculates the SFDR of anticosine operation result, i.e.,Wherein N is the digit of preferable ADC, fsFor sample rate, fBFor signal band
Width, selection SFDR corresponding cosine parameter work as cosine parameter calibration amounts when maximum, by the signal of each passage divided by corresponding
Cosine parameter calibration amount, makees anticosine computing, obtains each channel data after anticosine correction；
The biasing and amount of gain for causing to manipulator wavelength dependence again is demarcated and is adjusted：It is each logical after to anticosine correction
Track data does Fourier spectrum analysis and obtains power spectrum, takes the size conduct of DC position amplitude in the power spectrum of the i-th paths
The biasing scalar quantity a of signali, gain calibration amount of the size of signal amplitude as signal at the i-th paths standard signal frequency
bi；It is the 3rd reference channel all the way to choose certain, biases scalar quantity a with which0With the scalar quantity b of gain0On the basis of, first will be except the 3rd
Gain calibration amount b of other passages outside reference channeliCarry outAdjustment, then the biasing scalar quantity a to respective channeliEnter
OKAdjustment, correct the discordance of the biasing that causes of manipulator wavelength dependence and gain.
2. a kind of time wavelength-interleaved optical analog to digital conversion is demarcated and signal correction reconstructing method, including parameter calibration and correction reconstruct
Two stages：
The parameter calibration stage：By the sampling to a known signal, and interchannel increasing is extracted from the analysis of sampled result
Beneficial inhomogeneities parameter, cosine parameter, manipulator wavelength dependence parameter, as calibrating parameters；
Correction reconstruction stage：Reconstruct is corrected to the sampled result of actual signal using calibrating parameters；Characterized in that,
Described correction reconstruction stage, comprises the following steps that：
1. to sampled result, first with the time migration scalar quantity Δ t of each passagei, on the basis of the first reference channel chosen
The adjustment of sequential is carried out to rest channels, the data of sequential alignment are obtained；
2. to passage biasing and the correction of gain inequality：Each channel data after first align sequential is multiplied by respective channel
The ratio of gain calibration amount and the second reference channel gain calibration amount, i.e. B0/Bi, the gain inequality between correction channel；Again will
The i-th channel data after gain inhomogeneity correction is plus the second reference channel biasing scalar quantity carried out after gain ratio adjustment
With the difference of the biasing scalar quantity of respective channel, i.e.,Biasing inhomogeneities between correction channel；Biased and increased
The channel signal that benefit has been corrected；
3. the correction of manipulator cosine response：By each channel data divided by corresponding cosine parameter calibration amount, then carry out anticosine
Computing, corrects manipulator cosine response；
4. manipulator wavelength dependence correction：The biasing scalar quantity a calibrated by the 3rd reference channel according to choosing0And gain
Scalar quantity b0On the basis of, the first gain to other passages is carried outAdjustment, then to carrying out the i-th passage after Gain tuning
Biasing is carried outAdjustment, to gain and biasing be adjusted correction after obtain signal correction reconstruct.
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