CN109116660A - High speed Optical Sampling D conversion method and device based on coupling optical-electronic oscillator - Google Patents
High speed Optical Sampling D conversion method and device based on coupling optical-electronic oscillator Download PDFInfo
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Abstract
The invention discloses a kind of high speed Optical Sampling D conversion methods based on coupling optical-electronic oscillator.This method generates the high quality sample light pulse of Gao Zhongying, low jitter using coupling optical-electronic oscillator simultaneously, and the synchronization electric signal of low phase noise, low spurious, Optical Sampling is realized with obtained high quality sample light pulse, and the triggering clock signal of array of photoswitch in Optical Time Division Multiplexing module is generated using synchronous electric signal.The invention also discloses a kind of high speed Optical Sampling analog-digital commutators based on coupling optical-electronic oscillator.The invention can ensure that the characteristics such as the high sampling rate of optical analog to digital conversion, big bandwidth of operation and effective number of bits, the synchronization electric signal quality for avoiding the optical analog to digital conversion method of existing Optical Sampling electricity is difficult to ensure, so as to cause the limited problem of sample rate, bandwidth of operation and effective number of bits.
Description
Technical field
The present invention relates to a kind of D conversion method more particularly to a kind of high speed Optical Sampling D conversion methods and device.
Background technique
Analog-to-digital conversion converts analog signals into digital signal, is the critical function unit of current radio frequency system.Electric modulus
It is fuzzy that the processing speed of converter is limited to the Aperture Jitter of electric sampling clock, the stabilization time of sampling hold circuit and comparator
The problems such as, it is difficult to meet the fields such as ULTRA-WIDEBAND RADAR, ultra-wideband communications and electronic warfare to big bandwidth, high sampling rate, high effective ratio
The requirement of the analog-to-digital conversion of special digit.Using photon technology in multiplexing, low pulse time jitter, handle signal bandwidth, anti-dry greatly
It disturbs, the advantage of transmission etc. at a distance, the performance of analog-to-digital conversion can be significantly improved.Photon technology is introduced into analog-to-digital conversion
In, the limitation of electronic bottleneck is broken through, to realize the analog-to-digital conversion of big bandwidth, high sampling rate, high significant bit digit, becomes and works as
Preceding research hotspot.
Optical analog to digital conversion technology mainly includes that electricity samples light quantization, Optical Sampling light quantization, three kinds of Optical Sampling electricityization mainly
Mode.
Electricity sampling light quantization analog-digital converter is using the method for being sampled, being quantified in the electrical domain in the optical domain
(J.Stigwall and S.Galt.Analysis of the resolution-bandwidth-noise trade-off
in wavelength-based photonic analog-to-digital converters.Appl.Opt.45,2006,
Vol.45, No.18:4310-4318.), typical structure is as shown in Figure 1.The program realizes light quantization, simulation using spatial dispersion
Signal Regulation tunable laser exports the wavelength of laser, realizes the mapping of analogue signal amplitude to wavelength；It will by grating dispersion
Wavelength change reflection is arrived spatially, realizes the mapping of wavelength to space；Finally realize space to digital signal according to spatial position
Light quantization is completed in the mapping of coding.Analog-to-digital conversion mode based on light quantization abandons the excellent of low jitter optical pulse in Optical Sampling
Gesture, and quantized result is limited to the response time of detector and the nonlinear effect of tunable laser.Optical Sampling light quantization side
Case is Taylor scheme (the H.F.Taylor.An electro-optical analog- that H.F.Taylor was proposed in 1975
To-digital converter.Proceedings of IEEE, 1975,63:1524-1525), as shown in Figure 2.Sampled light
Pulse passes through n parallel M-Z type modulators first to be treated conversion signal and is sampled, the modulation spy of this n electrooptic modulator
The linearity curve period is in multiplication relation, and the half of setting maximum output light intensity is decision threshold, completes the quantization of n bit.The program
It can be realized the Optical Sampling and light quantization of high speed, but need electron threshold decision device, restrict the speed of whole analog-digital converter.And
And the program requires the half-wave voltage of multiple electrooptic modulators in multiplication relation, this leads to the half-wave voltage of highest order modulator
Can exponentially it rise as quantization digit improves；In order to realize that the low half-wave voltage that high-precision needs exponentially grade to reduce is modulated
Device, every quantified precision for increasing a bit just needs to increase by one times of modulator electrode length, to the realization process bands of modulator
Huge challenge is carried out.Realize that the modulation characteristics curve period is double by cascading multiple identical modulators simultaneously, and setting modulation
The different direct current biasing point of device realizes mode (the B.Jalali and Y.M.Xie.Optical of modulation characteristics curve phase shift
folding-flash analog-to-digital converter with analog encoding.Optics
Letters, vol.20, no.18, pp.1901-1903, Sep.1995), although as shown in figure 3, can alleviate to a certain extent
Requirement to modulator half-wave voltage, but be difficult to fundamentally solve the limitation of Optical Sampling light quantization analog-digital converter.
The mode of Optical Sampling electricity makes full use of area of light to generate the advantage of Gao Zhongying low jitter optical pulse, by low jitter
Gao Zhongying light pulse as sampling source, while taking full advantage of the high quality and maturity of electrical domain low frequency quantization technology again.When
Domain modulus in tension converter is a kind of light submodule converter (the Y.Han and of typical Optical Sampling electricity
B.Jalali.Continuous-time time-stretched analog-to-digital converter array
implemented using virtual time gating.IEEE Trans.Circuits and Syst.I,2005,52
(8): 1502-1507.), as shown in Figure 4.The program utilizes optical fiber on rf-signal modulation to chirped optical pulse to be converted
Effect of dispersion the broadening in time domain is carried out to modulated signal so that the frequency of radiofrequency signal and bandwidth reduce, then using low
Fast electricity analog-digital converter completes analog-to-digital conversion, improves the equivalent sampling rate and simulation input bandwidth of analog-to-digital conversion.The program exists
Time domain can introduce non-linear distortion to analog signal during stretching, and influence the accuracy of analog-to-digital conversion.Fig. 5 shows one kind
Interweaved based on active mode locking laser and time-domain spectral dual output modulation analog-to-digital conversion structure (H.J.Zhang, W.W.Zou,
G.Yang,J.P.Chen.Dual-output modulation in time-wavelength interleaved
photonic analog-to-digital converter based on actively mode-locked
Laser.Chinese Optics Letters, 2016,14 (3), 030602 (2016)), radiofrequency signal is injected into active mode locking
Laser generates the sampling light pulse of high quality, and one group of light pulse sequence is divided into multiple and different centers by wavelength division multiplexer 1
The light pulse sequence of wavelength, every group of light pulse sequence obtain Time Wave through the coupling of wavelength division multiplexer 1 after different delays
The light pulse centre frequency of the long light pulse to interweave, i.e. different moments is different.Dual output is passed through in the light pulse of time wavelength-interleaved
Electrooptic modulator is separated after being sampled to signal by wavelength division multiplexer 2 and wavelength division multiplexer 3 in the time domain, by photoelectricity
It is sent into the quantization of low-frequency electrical analog-digital converter after detector, the signal after 2N sample quantization is sent into Digital Signal Processing mould
Block completes analog-to-digital conversion.The program needs the radiofrequency signal of high frequency high quality to be injected into active mode locking laser, to guarantee to generate
Sampling light pulse quality；The characteristic for the radiofrequency signal injected directly affects the repetition of generated light pulse, the time trembles
The characteristics such as dynamic, therefore substantially still it is limited to electronic bottleneck.Meanwhile every road delay adjustment after wavelength division multiplexer 1 is mentioned
Harsh requirement is gone out, the accuracy of adjusting will have a direct impact on the distortion situation of digital signal.Fig. 6 gives a kind of typical base
In laser with active-passive lock mould Optical Sampling electricity quantization scheme (F.Scotti, F.Laghezza, S.Pinna, P.Ghelfi,
A.Bogoni.High Precision Phononic ADC with Four Time-Domain-Demultiplexed
Interleaved Channels.Optoelectronics and Communications Conference Held
Jointly with 2013 International Conference on Photonics in Switching.IEEE,
2013:1-2.).The light pulse sequence that laser with active-passive lock mould generates samples radiofrequency signal, introduces dual output electric light tune
Device processed is divided into multiple groups sub-sampling light pulse sequence for light pulse sequence is sampled as photoswitch in the time domain, to reduce each logical
The sampling rate in road, so that each channel can realize electrical domain quantization by the electric analog-to-digital conversion of low speed.In order to realize multichannel
Synchronous, the switch control voltage signal of dual output electrooptic modulator needs and the optical pulse synchronization of laser with active-passive lock mould, herein
Switch control signal obtained by the way that the light output of mode-locked laser is carried out photoelectric conversion, the phase noise of synchronization signal compared with
Difference, and it is various spuious more serious, it will influence the performance of light analog-to-digital conversion.And light pulse produced by laser with active-passive lock mould
Repetition is limited (representative value is several hundred MHz), to limit the advantage of whole-sample rate and light in high frequency.
In summary, the optical analog to digital conversion of Optical Sampling electricity quantification manner can make full use of area of light to generate low jitter simultaneously
The advantage of light pulse and the advantage of electrical domain low frequency quantization technology, but its performance be controlled Multichannel photoswitch electricity it is synchronous when
The limitation of clock performance, so that the working frequency of optical analog to digital conversion and effective number of bits are limited.
Summary of the invention
Technical problem to be solved by the present invention lies in existing optical analog to digital conversion technology is overcome the shortcomings of, one kind is provided and is based on
Couple optical-electronic oscillator high speed Optical Sampling D conversion method, by introduce couple optical-electronic oscillator, while generate Gao Zhongying,
The synchronization electric signal of the high quality sample light pulse of low jitter and low phase noise, low spurious, to guarantee optical analog to digital conversion
The characteristics such as high sampling rate, big bandwidth of operation and effective number of bits.
Technical solution of the present invention is specific as follows:
A kind of high speed Optical Sampling D conversion method based on coupling optical-electronic oscillator, comprising the following steps:
Step A, generating repetition using coupling optical-electronic oscillator is frLight pulse sequence and accordingly synchronize electric signal；
Step B, Optical Sampling is carried out to analog electrical signal to be sampled with the light pulse sequence, obtains sampling light pulse sequence
Column；
Step C, time domain Interleaved partitioning scheme is carried out to sampling light pulse sequence, it is specific as follows: to enable the sampling light pulse sequence
By a n grades of array of photoswitch, meanwhile, f is extracted from the synchronous electric signalr2 frequency dividing, 4 frequency dividing ..., 2nFrequency dividing
Electric signal, with 2iTriggering clock of the frequency dividing electric signal as i-stage photoswitch in the n grades of array of photoswitch, and by adjusting
The phase of each frequency dividing electric signal makes the on-off of each photoswitch and sampling light pulse moment one-to-one correspondence occur, obtains 2nWay
Sample light pulse sequence, wherein n is positive integer, i=1,2 ..., n；
Step D, electrical domain quantification treatment is carried out respectively to each way sampling light pulse sequence, then to obtained 2nA electricity
Domain quantized signal carries out solution Optical Time Division Multiplexing, obtains final digital signal.
Preferably, described to extract f from synchronous electric signalr2 frequency dividing, 4 frequency dividing ..., 2nElectric signal is divided, specifically
Are as follows: f is filtered out respectively from the synchronization electric signal that coupling optical-electronic oscillator is exportedr/2、fr/4……、fr/2nEach harmonic.
Or are as follows: frequency is f in the synchronization electric signal exported to coupling optical-electronic oscillatorrFundamental frequency signal carry out f respectivelyr/2、fr/
4……、fr/2nElectric divide operation.
Following technical scheme can also be obtained according to identical invention thinking:
A kind of high speed Optical Sampling analog-digital commutator based on coupling optical-electronic oscillator, comprising:
Optical-electronic oscillator is coupled, is f for generating repetitionrLight pulse sequence and accordingly synchronize electric signal；
Gloss egf block is sampled for carrying out Optical Sampling to analog electrical signal to be sampled with the light pulse sequence
Light pulse sequence；
Optical Time Division Multiplexing module, for carrying out time domain Interleaved partitioning scheme to sampling light pulse sequence, to obtain 2nWay is adopted
Sample light pulse sequence；The Optical Time Division Multiplexing module includes the n grade array of photoswitch connecting with gloss egf block output end,
And frequency division module, phase shift module；The frequency division module is for extracting f from the synchronous electric signalr2 frequency dividing, 4 points
Frequently ..., 2nElectric signal is divided, with 2iElectric signal is divided as in the n grades of array of photoswitch when triggering of i-stage photoswitch
Clock；The phase shift module is used to adjust the phase of each frequency dividing electric signal so that the on-off of each photoswitch goes out with sampling light pulse
Current moment corresponds；Wherein, n is positive integer, i=1,2 ..., n；
Quantization and digital processing module, for carrying out electrical domain quantification treatment respectively to each way sampling light pulse sequence, so
Afterwards to obtained 2nA electrical domain quantized signal carries out solution Optical Time Division Multiplexing, obtains final digital signal.
Preferably, the frequency division module is made of a series of electrical filters, for what is exported from coupling optical-electronic oscillator
F is filtered out respectively in synchronous electric signalr/2、fr/4……、fr/2nEach harmonic.Alternatively, the frequency division module is by a series of electricity
Frequency divider composition, for being f to frequency in the synchronization electric signal that optical-electronic oscillator is exported is coupledrFundamental frequency signal carry out respectively
fr/2、fr/4……、fr/2nElectric divide operation.
Preferably, the optical loop of the coupling optical-electronic oscillator includes that successively end to end strong standing wave effect formation is tied
Structure, Polarization Controller, intensity modulator, variable optical delay line, image intensifer.
It is further preferred that it includes: photo-coupler, optical circulator, non-pumped er-doped that the strong standing wave effect, which forms structure,
Optical fiber；The input terminal of photo-coupler is the input terminal that strong standing wave effect forms structure, its output all the way connects optical circulator
1 port；The another output of non-pumped Er-doped fiber connection photo-coupler and 2 ports of optical circulator；3 ends of optical circulator
Mouth is the output end that strong standing wave effect forms structure.
Preferably, the photoswitch in the array of photoswitch is that dual output Mach increases Dare modulator.Alternatively, the light is opened
The photoswitch closed in array is made of sequentially connected light polarization modulator, Polarization Controller, polarization beam apparatus.
Compared with prior art, technical solution of the present invention has the advantages that
The present invention generates the high quality sample light pulse of Gao Zhongying, low jitter by introducing coupling optical-electronic oscillator,
And the synchronization electric signal of low phase noise, low spurious, to guarantee the high sampling rate of optical analog to digital conversion, big bandwidth of operation and have
Characteristics, the synchronization electric signal quality for avoiding the optical analog to digital conversion method of existing Optical Sampling electricity such as effect bit number are difficult to protect
Card, the problem being limited so as to cause sample rate, bandwidth of operation and effective number of bits.
Detailed description of the invention
Fig. 1 is the light quantization structural schematic diagram based on space optical dispersion；
Fig. 2 is the full optical analog to digital conversion structural schematic diagram based on Taylor scheme；
Fig. 3 is based on the cascade full optical analog to digital conversion structural schematic diagram of multistage modulator；
Fig. 4 is the light submodule transformational structure schematic diagram stretched based on time domain；
Fig. 5 is that the dual output to be interweaved based on active mode locking laser and time-domain spectral modulates analog-to-digital conversion structural schematic diagram；
Fig. 6 is the high-precision optical analog to digital conversion structural schematic diagram of the time domain interlace-multiplex based on laser with active-passive lock mould；
Fig. 7 is the structural block diagram of the high speed Optical Sampling analog-digital commutator of the invention based on coupling optical-electronic oscillator；
Fig. 8 is the concrete structure schematic diagram of a preferred embodiment of the invention；
Fig. 9 is the optical pulse waveform figure for coupling optical-electronic oscillator and generating；
Figure 10 is the phase noise for coupling optical-electronic oscillator；
Figure 11 is the sampling and its data processed result using structure shown in Fig. 8 to 1GHz sinusoidal signal；
Figure 12 is using structure shown in Fig. 8 to the sampled result and processing result of the sinusoidal signal of 2GHz；
Figure 13 is using structure shown in Fig. 8 to the sampled result and processing result of the sinusoidal signal of 11GHz；
Figure 14 is the concrete structure schematic diagram of another preferred embodiment of the invention.
Specific embodiment
For the deficiency of the optical analog to digital conversion technology of existing Optical Sampling electricity, thinking of the invention is to utilize coupling photoelectricity
Oscillator comes while generating Gao Zhongying, the high quality sample light pulse of low jitter and low phase noise, low spurious synchronizes electricity
Signal realizes Optical Sampling with obtained high quality sample light pulse, and generates Optical Time Division Multiplexing module using synchronous electric signal
The triggering clock signal of middle array of photoswitch.The advantage of the program be sample rate is high, work belt is roomy, significant bit digit is high,
System structure is simple, consistency is strong.
Specifically, the present invention is based on the high speed Optical Sampling analog-digital commutators of coupling optical-electronic oscillator, comprising: coupling light
Electrical oscillator is f for generating repetitionrLight pulse sequence and accordingly synchronize electric signal；
Gloss egf block is sampled for carrying out Optical Sampling to analog electrical signal to be sampled with the light pulse sequence
Light pulse sequence；
Optical Time Division Multiplexing module, for carrying out time domain Interleaved partitioning scheme to sampling light pulse sequence, to obtain 2nWay is adopted
Sample light pulse sequence；The Optical Time Division Multiplexing module includes the n grade array of photoswitch connecting with gloss egf block output end,
And frequency division module, phase shift module；The frequency division module is for extracting f from the synchronous electric signalr2 frequency dividing, 4 points
Frequently ..., 2nElectric signal is divided, with 2iElectric signal is divided as in the n grades of array of photoswitch when triggering of i-stage photoswitch
Clock；The phase shift module is used to adjust the phase of each frequency dividing electric signal so that the on-off of each photoswitch goes out with sampling light pulse
Current moment corresponds；Wherein, n is positive integer, i=1,2 ..., n；
Quantization and digital processing module, for carrying out electrical domain quantification treatment respectively to each way sampling light pulse sequence, so
Afterwards to obtained 2nA electrical domain quantized signal carries out solution Optical Time Division Multiplexing, obtains final digital signal.
The basic structure of analog-digital commutator of the present invention is as shown in Figure 7.Wherein, coupling optical-electronic oscillator is for generating repetition
For frHigh quality high frequency sampling light pulse sequence and Low phase noise, low spurious synchronous electric signal；Electrooptic modulator 2 will be to be sampled
Analog electrical signal is modulated to sampling light pulse sequence, sampling light pulse sequence is obtained, to realize Optical Sampling；Array of photoswitch is used
It is divided into 2 in light pulse sequence will be samplednRoad, with 2nA sampling light pulse is a cycle, by 2 in a cyclenA sampled light
Pulse is respectively fed to 2nRoad repeats the branch process in each period completely, obtains 2nWay samples light pulse sequence, to realize
Sample the time domain Interleaved partitioning scheme of light pulse sequence；Frequency division module is for extracting f from the synchronous electric signalr2 frequency dividing, 4
Frequency dividing ..., 2nElectric signal is divided, with 2iDivide triggering of the electric signal as i-stage photoswitch in the n grades of array of photoswitch
Clock；Phase shift module is used to adjust the phase of each frequency dividing electric signal so that the on-off of each photoswitch and sampling light pulse occur
Moment corresponds；2nWay samples light pulse sequence respectively after photodetector is converted to electrical pulse sequence, then benefit respectively
The quantification treatment of electrical domain is carried out with low speed electricity analog-digital converter；Low speed electricity analog-digital converter output signal through Digital Signal Processing,
It is final to realize high sampling rate, the Optical Sampling analog-to-digital conversion of high significant bit digit.
It should be noted that if using need it is external the low speed electricity analog-digital converter of clock signal is provided, can be as
Shown in Fig. 7,2 are usednElectric signal is divided as its clock signal；There is the electric modulus of internal clocking in this way for similar oscillograph
Internal clock signal then can be used directly in converter, without using 2nElectric signal is divided as its clock signal.
It is further understood for the ease of the public, to carry out more technical solution of the present invention with two specific embodiments below
It is described in detail.
Specific embodiment 1:
Fig. 8 shows the basic structure of the specific embodiment of the invention 1, as shown in figure 8, in the embodiment based on coupling light
The high speed Optical Sampling analog-digital commutator of electrical oscillator includes: coupling optical-electronic oscillator, electrooptic modulator, two-divider, electromigration
Phase device, dual output Mach increase Dare modulator, photodetector and low speed electricity analog-digital converter.Coupling optical-electronic oscillator can produce
Third contact of a total solar or lunar eclipse pulse and synchronous electric signal；Couple the light input end of the light pulse output end connection electrooptic modulator of optical-electronic oscillator；To
The radio frequency interface of conversion signal input electrooptic modulator；The input terminal of the light output end connection array of photoswitch of electrooptic modulator；
The input terminal of two-divider is separately connected the synchronous electrical signal and electric phase shifter of coupling optical-electronic oscillator with output end
Input terminal；The output end of electric phase shifter and the switch control interface of photoswitch connect；There are multiple output channels after photoswitch, each
Output channel connects the input terminal of a photodetector；The output end of each photodetector connects a low speed electricity modulus and turns
Parallel operation uses real-time oscilloscope as low speed electricity analog-digital converter in experiment, due to containing clock signal inside real-time oscilloscope,
So external offer synchronizing clock signals can not needed；The output result of multiple electricity analog-digital converters passes through Digital Signal Processing
Module is handled.
As shown in figure 8, the coupling optical-electronic oscillator in the present embodiment include: intensity modulator, it is photo-coupler 1 and 2, adjustable
Optical delay line, image intensifer, strong standing wave effect form structure, Polarization Controller, photodetector, electric bandpass filter, electricity and put
Big device, electric coupler.The light output of intensity modulator inputs photo-coupler 1；The wherein output port connection all the way of photo-coupler 1
Photo-coupler 2；Wherein exporting all the way for photo-coupler 2 is used as sampling light pulse, and another output inputs variable optical delay line；It can
The output signal for dimming delay line enters strong standing wave effect by image intensifer and forms structure；Polarization Controller connects strong standing wave effect
The output end of structure and the light input end of intensity modulator should be formed；The another output port connection photoelectricity of photo-coupler 1 is visited
Survey the input terminal of device 1；The output end of electric bandpass filter connection photodetector and the input terminal of electric amplifier；Electric amplifier
Output signal is divided into two-way by electric coupler, all the way the electric input port of input intensity modulator, and another way is as synchronous telecommunications
Number output, synchronous electric signal are used to provide control electricity for photoswitch (the present embodiment uses dual output MZ Mach-Zehnder)
Pressure.Wherein, it includes: photo-coupler 3, optical circulator, non-pumped Er-doped fiber that strong standing wave effect, which forms structure,.Photo-coupler 3
Input terminal is the input terminal that strong standing wave effect forms structure, 1 port of its connection optical circulator of output all the way；It is non-pumped to mix
Erbium optical fiber connects the another output of photo-coupler 3 and 2 ports of optical circulator；3 ports of optical circulator are strong standing wave effect
The output end of structure should be formed.
Coupling optical-electronic oscillator system is made of optical loop and photoelectric feedback loop.All wavelengths present in optical loop
Signal, minimum wavelength interval are a fixed values, this value is inversely proportional with optical loop length.When entire loop starts operation,
Image intensifer provides a wide spectrum light source, the signal being spaced apart due to that can only have one group of equiwavelength in optical loop, so through
Crossing the electric signal obtained after 1 beat frequency of photodetector is also equal frequency intervals.After the bandpass filter of high q-factor, only
The frequency component of our needs can be left.Obtained electric signal is filtered by the optical signal in intensity modulator modulation optical loop.
The wavelength of each circle gain and loss balancing can be just retained in optical loop.Strong standing wave effect forms structure to all waves
Long gain is simultaneously uneven, and powerful signal priority is amplified, and modulator preferentially modulates high-power signal, obtains up and down
Variable speed is divided into the modulating frequency that electric bandpass filter determines, due to power itself when lower sideband recycles again next time
It is higher, it is amplified modulation again and generates lower sideband.Stable light pulse and synchronous electric signal are formed by repeatedly recycling.
The light pulse sequence that coupling optical-electronic oscillator generates enters electrooptic modulator, treats conversion signal and is sampled；It is double
Output Mach increases Dare modulator as photoswitch and high-speed sampling result is divided into two-way, and the sample rate of every paths becomes former light
The half of impulse sampling rate；Two-divider and phase shifter are passed through in the synchronization electric signal output for coupling optical-electronic oscillator, as lose-lose
Mach increases the switching voltage of Dare modulator out.Two-way sampled result is converted to telecommunications after inputting photodetector 2 and 3 respectively
Number；The electric signal on every road is quantified by low speed electricity analog-digital converter, realizes analog-to-digital conversion；Multichannel is passed through into low speed electricity modulus
Signal after conversion recovers original signal, realizes entire optical analog to digital conversion by Digital Signal Processing.
Fig. 9 gives the optical pulse waveform figure that coupling optical-electronic oscillator generates, repetition rate 10GHz.Figure 10 gives
The phase noise for coupling optical-electronic oscillator, down to -130.52dBc/Hz at 10kHz.
Figure 11 gives the sampling and its data processed result to 1GHz sinusoidal signal: wherein (a) is the sine to 1GHz
The sampled result of binary channels Optical Sampling analog-to-digital conversion of the signal based on coupling optical-electronic oscillator is (b) when carrying out to sampled result
Between normalize after processing result, (c) sampled point extracted for time normalization post-sampling result, (d) for by amplitude normalizing
Sampled point after change is (e) sampled result after binary channels merging and the sinusoidal signal waveform recovered according to sampled result,
(f) Fourier transform spectrum to merge post-sampling result.The significant bit digit of sampled result is 3.92bits, centre frequency
1GHz。
Figure 12 gives the sampled result and processing result to the sinusoidal signal of 2GHz, wherein (a) is the sine to 2GHz
The sampled result of binary channels Optical Sampling analog-to-digital conversion of the signal based on coupling optical-electronic oscillator, adopting after (b) merging for binary channels
Sample result and the sinusoidal signal waveform recovered according to sampled result, (c) Fourier transform spectrum to merge post-sampling result.It adopts
The significant bit digit of sample result is 3.55bits, centre frequency 2.02GHz.
Figure 13 gives the sampled result and processing result to the sinusoidal signal of 11GHz, wherein (a) be to 11GHz just
The sampled result of binary channels Optical Sampling analog-to-digital conversion of the string signal based on coupling optical-electronic oscillator, after (b) merging for binary channels
Sampled result and the sinusoidal signal waveform recovered according to sampled result, (c) Fourier transform spectrum to merge post-sampling result.
The significant bit digit of sampled result is 3.23bits, centre frequency 1.01GHz
The result verification of Fig. 9-Figure 13 feasibility of the structure can realize that sample rate is high, work belt is roomy, effective ratio
The high analog-to-digital conversion of special digit.
Specific embodiment 2:
Figure 14 shows the basic structure of specific embodiment 2.Light pulse is sampled with synchronous electric signal by coupling optoelectronic oscillation
Device generates.As shown in figure 14, radiofrequency signal to be sampled is modulated to the weight of coupling optical-electronic oscillator output by electrooptic modulator
Frequency is frSampling light pulse on, modulated optical signal is sent into light polarization modulator 1.The electricity output mouth for coupling optical-electronic oscillator is defeated
Frequency is f outrElectric oscillation signal and frequency be fr/ 2, fr/ 4 ... each harmonic；Frequency division module by centre frequency not
A series of same electrical filters are realized, by selecting the centre frequency of electrical filter, can filter out f respectivelyr/2,fr/ 4 ... it is each
Rd harmonic signal as array of photoswitch control signal modulation to light polarization modulators at different levels, the signal modulated are as follows:
In formula, ω0For the angular frequency of carrier wave, ωcFor synchronous electric signal angular frequency, E0For light carrier amplitude.
Make the main shaft and polarization beam apparatus of Polarization Controller with the synchronous electric signal of input by adjusting Polarization Controller 2
Main shaft be in 45° angle, the signal of two delivery outlets of polarization beam apparatus 1 are as follows:
Optical power is calculated to obtain:
It can be seen that two signals of two delivery outlet Output optical power complementations of polarization beam apparatus from formula (3), so
Under the action of synchronous electric signal, sequentially connected light polarization modulator, Polarization Controller and polarization beam apparatus realize photoswitch
Function.The level-one sub-sampled signals that two sample rates are former sampling pulse half are obtained in two delivery outlets of polarization beam apparatus 1,
The two level-one sub-sampled signals have separately included 2n-1 light pulse of sampling pulse and the 2n light pulse, wherein n=1,
2,3,4 ..., the two level-one sub-sampled signals are respectively fed to light polarization modulator 2 and light polarization modulator 3.Synchronous electric signal warp
Control light polarization modulator 2 and light polarization modulator 3 are respectively used to after crossing two-divider 1 and two-divider 2.Two light polarization modulators it
The available four second level sub-sampled signals after Polarization Controller and polarization beam apparatus of signal afterwards.Four second level are adopted
Sample signal quantifies to complete analog-to-digital conversion using low-frequency electrical analog-digital converter after photodetector is converted to electric signal.It will
Signal of the multichannel after low speed electricity analog-to-digital conversion recovers original signal, realizes entire optical mode by Digital Signal Processing
Number conversion.
Claims (10)
1. a kind of high speed Optical Sampling D conversion method based on coupling optical-electronic oscillator, which comprises the following steps:
Step A, generating repetition using coupling optical-electronic oscillator is frLight pulse sequence and accordingly synchronize electric signal；
Step B, Optical Sampling is carried out to analog electrical signal to be sampled with the light pulse sequence, obtains sampling light pulse sequence；
Step C, time domain Interleaved partitioning scheme is carried out to sampling light pulse sequence, it is specific as follows: the sampling light pulse sequence being enabled to pass through
One n grades of array of photoswitch, meanwhile, f is extracted from the synchronous electric signalr2 frequency dividing, 4 frequency dividing ..., 2nDivide telecommunications
Number, with 2iTriggering clock of the electric signal as i-stage photoswitch in the n grades of array of photoswitch is divided, and by adjusting each point
The phase of frequency electric signal makes the on-off of each photoswitch and sampling light pulse moment one-to-one correspondence occur, obtains 2nWay sampling
Light pulse sequence, wherein n is positive integer, i=1,2 ..., n；
Step D, electrical domain quantification treatment is carried out respectively to each way sampling light pulse sequence, then to obtained 2nA electrical domain amount
Change signal and carry out solution Optical Time Division Multiplexing, obtains final digital signal.
2. method as described in claim 1, which is characterized in that described to extract f from synchronous electric signalr2 frequency dividing, 4 points
Frequently ..., 2nElectric signal is divided, specifically: f is filtered out respectively from the synchronization electric signal that coupling optical-electronic oscillator is exportedr/2、
fr/4……、fr/2nEach harmonic.
3. method as described in claim 1, which is characterized in that described to extract f from synchronous electric signalr2 frequency dividing, 4 points
Frequently ..., 2nElectric signal is divided, specifically: frequency is f in the synchronization electric signal exported to coupling optical-electronic oscillatorrFundamental frequency
Signal carries out f respectivelyr/2、fr/4……、fr/2nElectric divide operation.
4. a kind of high speed Optical Sampling analog-digital commutator based on coupling optical-electronic oscillator characterized by comprising coupling photoelectricity
Oscillator is f for generating repetitionrLight pulse sequence and accordingly synchronize electric signal；
Gloss egf block obtains sampled light arteries and veins for carrying out Optical Sampling to analog electrical signal to be sampled with the light pulse sequence
Rush sequence；
Optical Time Division Multiplexing module, for carrying out time domain Interleaved partitioning scheme to sampling light pulse sequence, to obtain 2nWay sampled light arteries and veins
Rush sequence；The Optical Time Division Multiplexing module includes the n grade array of photoswitch connecting with gloss egf block output end, Yi Jifen
Frequency module, phase shift module；The frequency division module is for extracting f from the synchronous electric signalr2 frequency dividing, 4 frequency dividing ...,
2nElectric signal is divided, with 2iTriggering clock of the frequency dividing electric signal as i-stage photoswitch in the n grades of array of photoswitch, 2nFrequency dividing
Electric signal provides clock signal simultaneously for quantization and digital processing module；The phase shift module is used to adjust each frequency dividing electric signal
Phase is so that moment one-to-one correspondence occur in the on-off of each photoswitch and sampling light pulse；Wherein, n is positive integer, i=1,
2,…,n；Quantization and digital processing module, for carrying out electrical domain quantification treatment respectively to each way sampling light pulse sequence, then
To obtained 2nA electrical domain quantized signal carries out solution Optical Time Division Multiplexing, obtains final digital signal.
5. device as claimed in claim 4, which is characterized in that the frequency division module is made of a series of electrical filters, for from
F is filtered out respectively in the synchronization electric signal that coupling optical-electronic oscillator is exportedr/2、fr/4……、fr/2nEach harmonic.
6. device as claimed in claim 4, which is characterized in that the frequency division module is made of a series of electric frequency dividers, for pair
Frequency is f in the synchronization electric signal that coupling optical-electronic oscillator is exportedrFundamental frequency signal carry out f respectivelyr/2、fr/4……、fr/2n
Electric divide operation.
7. device as claimed in claim 4, which is characterized in that the optical loop of the coupling optical-electronic oscillator includes successively head and the tail phase
Strong standing wave effect even forms structure, Polarization Controller, intensity modulator, variable optical delay line, image intensifer.
8. device as claimed in claim 7, which is characterized in that it includes: photo-coupler, the ring of light that the strong standing wave effect, which forms structure,
Row device, non-pumped Er-doped fiber；The input terminal of photo-coupler is the input terminal that strong standing wave effect forms structure, it defeated all the way
1 port of optical circulator is connected out；The another output of non-pumped Er-doped fiber connection photo-coupler and 2 ends of optical circulator
Mouthful；3 ports of optical circulator are the output end that strong standing wave effect forms structure.
9. device as claimed in claim 4, which is characterized in that the photoswitch in the array of photoswitch is that dual output Mach increases moral
That modulator.
10. device as claimed in claim 4, which is characterized in that the photoswitch in the array of photoswitch is by sequentially connected inclined
Vibration modulator, Polarization Controller, polarization beam apparatus are constituted.
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| CN110011780A (en) * | 2019-03-04 | 2019-07-12 | 华中科技大学 | A kind of modulus mixing electric light chaotic signal synchronization generating device and method |
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| CN114062782A (en) * | 2021-10-21 | 2022-02-18 | 中国电子科技集团公司第二十九研究所 | 2-bit sampling quantization system and method suitable for broadband radio frequency signal spectrum estimation |
| CN114062782B (en) * | 2021-10-21 | 2023-04-28 | 中国电子科技集团公司第二十九研究所 | 2-bit sampling quantization system and method suitable for broadband radio frequency signal spectrum estimation |
| CN114280549A (en) * | 2021-12-26 | 2022-04-05 | 中国电子科技集团公司第十四研究所 | High-speed optical pulse generating device and method |
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