CN106444215A - Optical analog-digital converter with configurable frequency response - Google Patents
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Abstract
An optical analog-digital converter with configurable frequency response sequentially comprises a controllable pulse shape optical sampling clock generating module, a repetition frequency doubling module, an electro-optical modulator, a multi-channel module, a photoelectric conversion module, an electric filter module, an electric analog-digital conversion module, a digital processing unit and a clock synchronization and aligning module. The optical analog-digital converter with configurable frequency response provides both analog processing and digitalization for broadband input microwave signals, system complexity is greatly reduced, and the problems, such as high insertion loss and signal distortion, due to respective filtration and sampling are avoided; system equivalent frequency response may be configured flexibly by adjusting time-domain shape of an optical sampling clock.
Description
Technical field
The present invention relates to optical analog to digital conversion, the configurable optical analog to digital conversion device of specifically a kind of frequency response.
Background technology
Due to being limited by " electronic bottleneck ", electronic technology is difficult to meet ultra-wideband communications, radar, high end instrument and section
Learn the higher and higher frequencies in field such as research and the process demand of bandwidth signal.Photon technology has ultra broadband, ultrahigh speed, high-precision
The advantages of spend, can effectively overcome the shortcomings of electronic technology.It is current concern based on the high-frequency wideband signal transacting of photon technology
Focus.
Analog filtering can realize the purposes such as frequency-selecting, phase shift and the delay of signal, is basic analog signal processing technology
One of.Electrofiltration ripple is restricted due to the impact of " electronic bottleneck ", the performance such as operating frequency.Microwave photon filter utilizes photon
Technology realizes the filtering of microwave signal, has the advantages that to carry roomy, low-loss, has when processing high-frequency signal very excellent greatly
Gesture.At present it has been suggested that multiple microwave photon filter schemes, traditional method has two kinds：First method is electricity consumption difference
Structure, just achieves this kind of structure early in nineteen ninety-five, but this kind of method adjustability and reconfigurability are poor, and current collector part
Bandwidth limits；Second method is to realize the wave filter of overall coefficient using complicated photoelectric device, but this kind of method cost is very high.
Recently, the structure of a lot of novel low-costs is reported for realizing the microwave photon filter with negative coefficient.Wherein utilize partially
The most attractive (WANG Q, the YAO J.Multitap photonic microwave of method of polarization state and external modulator
filters with arbitrary positive and negative coefficients using a
polarization modulator and an optical polarizer[J].IEEE Photonics Technology
Letters,2008,20(2):78-80.).
By analog signal digital, carry out storing, process, transmit and showing to be the trend of Information Technology Development.Modulus turns
Parallel operation is digitized core devices.Electric analog-to-digital conversion (EADC:Electronic Analog to Digital
Converter) factor such as being obscured by clock jitter and comparator is affected, and performance close to theoretical limit, improves face further
Face very big challenge.
Optical analog to digital conversion device (PADC:Photonic Analog to Digital Converter) using photonic propulsion width
The advantages of band, high accuracy, realizes the high-precision digital to broadband signal, has the advantages that high bandwidth, high sampling rate, is a kind of
Realize the effective way of ultrahigh speed high precision analogue conversion.Have pointed out multiple optical analog to digital conversion technical schemes at present, including optics
The analog-digital converter of auxiliary, the analog-digital converter of Optical Sampling electricity, the analog-digital converter of electricity sampling light quantization and full light modulus
Converter.Wherein, the analog-digital converter of Optical Sampling electricity can utilize high bandwidth, high accuracy and the maturation of photonic propulsion simultaneously
The advantage of electricity, becomes one of focus of attention.Mainly there is the analog-digital converter scheme of two kinds of Optical Sampling electricity at present：Base
In wavelength-division multiplex (T.R.Clark, J.U.Kang and R.D.Esman, " Performance of a time and
wavelength interleaved photonic sampler for analog-digital conversion,”IEEE
Photon.Tech.Lett., vol.11,1168～1169,1999) and it is based on time-division multiplex technology (A.Yariv and
R.G.M.P.Koumans et al.,“Time interleaved optical sampling for ultra-high
speed A/D conversion,”Electronics Letters,34(21):2012-2013,1998).
In a lot of applications, need to be filtered and two kinds of functions of analog-to-digital conversion simultaneously.The microwave photon of report at present
Filtering and optical analog to digital conversion scheme all can be only done one of filtering or analog-to-digital conversion function, and the two also cannot be in area of light
On be joined directly together to realize two kinds of functions simultaneously.If be connected by opto-electronic conversion, not only system complex, and can introduce
Extra noise.
Content of the invention
For above-mentioned the deficiencies in the prior art, the present invention provides a kind of frequency response configurable optical analog to digital conversion device.
This device is based on time-interleaved optical analog to digital conversion structure, is more than single sampled light arteries and veins in the time domain width of electrical filter impulse response
Under conditions of rushing time domain pulsewidth, using the relation between Optical Sampling pulse profile and optical analog to digital conversion device frequency response, by changing
Darkening sampling pulse time domain profile realizes the configuration of optical analog to digital conversion response, thus realize the filtering to input microwave signal simultaneously
And digitlization.
The technical solution of the present invention is as follows：
A kind of configurable optical analog to digital conversion device of frequency response, including Optical Sampling clock generation module (1), its special electricity exists
It is made up of optical pulse sequence generator and programmable optical pulse reshaper in described Optical Sampling clock generation module, along described
The laser outbound course of programmable optical pulse reshaper is repetition rate multiplication modules, electrooptic modulator, optics demultiplexing successively
Device, photoelectric conversion module, electric filtration module, electric analog-to-digital conversion module and digital processing element, described digital processing element
First output end is connected with the control end of described programmable optical pulse reshaper, and clock is synchronous to contain tunable optical with alignment module
Delayer, the light pulse sequence of the described synchronous first port with alignment module of clock and described Optical Sampling clock generation module
Line between row generator and programmable optical pulse reshaper connects, the synchronous second port with alignment module of described clock
It is connected with described electric analog-to-digital conversion module, synchronous the 3rd port with alignment module of described clock and described digital processing
Second output end of unit is connected, the synchronous control receiving described digital processing element with alignment module of described clock, real
Now to the synchronization of electric sampling clock and Optical Sampling pulse train with align, be sampled the modulation from described electrooptic modulator for the signal
End input；
Described Optical Sampling clock generation module produces the controlled light arteries and veins of time domain profile according to the configuration of digital processing element
Rush sequence, after the repetition rate of repetition rate multiplication modules multiplication Optical Sampling pulse train, input electrooptic modulator；This electricity
Optical modulator reception is sampled electric signal and carries out intensity modulated to light pulse sequence, and output intensity carries the light being sampled electric signal
Pulse train；This light pulse sequence enters described optical multiplexer, will carry the high-speed light sampling pulse being sampled signal
Sequence is demultiplexing as N road low speed signal；Each road low speed signal of output all corresponds to an opto-electronic conversion of photoelectric conversion module
Device and an electrical analogue wave filter of electric filtration module；Photoelectric conversion module is exported again by electric modulus with every road of electric filtration module
Modular converter is converted to data signal；N railway digital signal reconstructs the electric signal being sampled through digital processing element, and N is more than 1
Integer.
Described optical pulse sequence generator produces the input that light pulse sequence sends into programmable optical pulse reshaper,
Under the control of digital processing element, the pulse profile of Optical Sampling clock is adjusted, produces pulse profile and meet design requirement
And intensity periodically variable optical signal in time, the frequency response to system configures.
Described clock is synchronous to have two types with alignment module：
The first includes adjustable optical delay line, optical-electrical converter and a phase-locked loop circuit, and described light pulse sequence is sent out
In the Optical Sampling clock input adjustable delay line that raw device sends, time delay is controlled by described digital processing element so as to
It is finely adjusted in a cycle, be converted to through optical-electrical converter and input in phase-locked loop circuit after electric signal again, by phaselocked loop
The described electric analog-to-digital conversion module of output signal input, as the sampling clock of electric analog-to-digital conversion module, makes electric analog-digital converter begin
The peak of electric pulse after the filtering is sampled eventually；
Second comprises high stable clock source, laser instrument repetition rate lock, adjustable time delay and a phaselocked loop electricity
Road, high stable clock source provides low phase noise, the clock signal of low jitter, and this clock signal repeats frequency through described laser instrument
After rate lock, the repetition rate that the described optical pulse sequence generator of input sends pulse train to it is adjusted, by it
It is locked on high stable clock source；Adjustable time delay described in this clock signal input, described digital processing element controls can
The time delay adjusting delayer so as to be finely adjusted in a cycle, through when the clock signal delayed input phaselocked loop again
In circuit, obtain a stable repetition rate and electric analog-digital converter sample rate identical pulse signal, for electric analog-to-digital conversion
Module provides sampling clock, so that the peak of electric analog-digital converter electric pulse all the time after the filtering is sampled.
The time domain width of described electrical filter impulse response is more than single sampling optical pulse time domain pulsewidth.
The frequency response of whole system is configured by adjusting Optical Sampling clock and electrical filter, system equivalent impulse response
hA(t) and Optical Sampling clock time domain waveform p (t) and the impulse response h of described electrical filterET () meets relation：hA(t)=Kp
(-t)hET (), K is constant.
Described clock is synchronous be used for alignment module the synchronous frequency sampled with the described electric analog-digital converter that aligns and
Phase place.When clock synchronization adjusts the sampling of electric analog-digital converter with alignment module according to the feedback of described digital processing element
Clock is so that the peak of its electric pulse after the filtering all the time is sampled.The intensity of the signal recovering so can be increased,
Effectively reduce influence of noise, the brought impact of sampling time shake can also be reduced simultaneously.
Based on above technical characterstic, the present invention has advantages below：
The present invention can realize the configurable analog-to-digital conversion of frequency response, can complete the photon filter of wide-band microwave signal simultaneously
Ripple and digitlization, and frequency response can configure adjustment, substantially reduce the complexity of microwave photon process, improve flexibility.By
Electric signal before entering electric analog-digital converter sampling is processed after filtering, can effectively reduce and electric analog-digital converter is simulated
The requirement of input performance, breaks through the restriction to system for the electric analog-digital converter " electronic bottleneck ".
Brief description
Fig. 1 is the system block diagram of frequency response of the present invention configurable optical analog to digital conversion device embodiment 1.
Fig. 2 is the course of work schematic diagram of embodiment 1.
Fig. 3 is the system block diagram of frequency response of the present invention configurable optical analog to digital conversion device embodiment 2.
Specific embodiment
The invention will be further described with reference to the accompanying drawings and examples.Before 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.
Embodiment 1：
The present embodiment system block diagram is as shown in figure 1, include：Optical Sampling clock generation module 1, repetition rate multiplication modules 2,
Electrooptic modulator 3, optical multiplexer 4, photoelectric conversion module 5, electric filtration module 6, electric analog-to-digital conversion module 7, digital processing
Unit 8 and clock synchronization and alignment module 9.
Described Optical Sampling clock generation module 1 includes optical pulse sequence generator (for mode-locked laser) 1-1 and can compile
Journey optical pulse shaper (for waveshaper, Finisar, 4000s) 1-2.Optical pulse sequence generator 1-1 produces repetition rate
Light pulse sequence for f, sends into the input of programmable optical pulse reshaper 1-2.Programmable optical pulse reshaper 1-2 is not according to
With needing, it is more than the condition of single sampling optical pulse time domain pulsewidth in the time domain width meeting described electrical filter impulse response
Under, under digital processing element 8 controls, the pulse profile of Optical Sampling clock is adjusted.Optical Sampling clock generation module 1 is defeated
Going out repetition rate is f and the controlled sampling light pulse sequence of pulse profile, as shown in Figure 2.
Described spectrum segmentation times frequency module 2, using the method for spectrum segmentation, using Wave decomposing multiplexer (for Waveguide array
Grating AWG：Arrayed Waveguide Grating) original light pulse is divided into the subpulse of N number of different wave length by 2-1,
And it is respectively fed to corresponding optical delay line 2-2 and optical attenuator (AT：Attenuator) 2-3, passes through wavelength division multiplexer 2-4 afterwards
Carry out wavelength-division multiplex, the Optical Sampling pulse train waiting time delay spacing that final output is f × N for sample rate.This Optical Sampling pulse
Sequence is as shown in Figure 2.
The electric signal being sampled is modulated at gloss by described electrooptic modulator 3 (for Mach-Zehnder electro-optic modulator)
In sample pulse train.Electrooptic modulator is output as intensity and carries the Optical Sampling pulse train being sampled electric signal, as institute in Fig. 2
Show.
Described optical multiplexer 4 (for array waveguide grating) will be from electrooptic modulator by Wave Decomposition multiplex mode
Carry and be sampled the high speed wavelength division multiplexing light pulse sequence of signal and be decomposed into N road low-speed parallel light pulse sequence, the arteries and veins on each road
Rush repetition rate f of light pulse of sampling before repetition rate is reduced to wavelength-division multiplex, as shown in Figure 2
Described photoelectric conversion module 5 comprises multiple passages with electric filtration module 6, and each passage corresponds to optical multiplexer
An output channel.One optical-electrical converter and electrical analogue wave filter are had on each passage.Optical-electrical converter is used for light
Signal is converted into electric signal, completes to filter through electrical filter.
Described electric analog-to-digital conversion module 7 is made up of the electric analog-digital converter that N number of sample rate is f.Each electric analog-to-digital conversion
Device receives a road output of electric filtration module 6, according to the synchronous clock signal with alignment module 9 input of clock, by input signal
Be converted to data signal to export to digital processing element 8.
Described digital processing element 8 receive user instruction configures to programmable optical pulse reshaper 1-2, by multichannel
The data signal of electric analog-digital converter input is reconstructed in digital processing element and is sampled signal by what filtering process was crossed, and root
Control clock synchronous and alignment module 9 according to result, find optimal result.
Described clock synchronization and alignment module 9, as shown in figure 1, comprise adjustable optical delay line 9-1, optical-electrical converter 9-2
With a phase-locked loop circuit 9-3.In the Optical Sampling clock input adjustable delay line 9-1 that optical pulse sequence generator 1-1 sends, by
Digital processing element 8 controls the time delay of adjustable delay line 9-1 so as to be finely adjusted in a cycle, turns through photoelectricity
Parallel operation 9-2 inputs in phase-locked loop circuit 9-3 after being converted to electric signal again, obtains a stable repetition rate and electric analog-to-digital conversion
The sample rate identical pulse signal of device.Using the electric analog-to-digital conversion module 7 of output signal input of phaselocked loop as electric analog-to-digital conversion
The sampling clock of module is so as to can sample near the peak position of electric pulse.
Embodiment 2：
The present embodiment system block diagram is as shown in figure 3, include：Optical Sampling clock generation module 1, repetition rate multiplication modules 2,
Electrooptic modulator 3, optical multiplexer 4, photoelectric conversion module 5, electric filtration module 6, electric analog-to-digital conversion module 7, digital processing
Unit 8, and clock synchronization and alignment module 9.
Module 1～8 in embodiment 2 is identical with embodiment 1, is not repeated.
Described clock synchronization and alignment module 9, as shown in figure 3, comprise high stable clock source 9-1, laser instrument repeats frequency
Rate lock 9-2, adjustable time delay 9-3 and a phase-locked loop circuit 9-4.High stable clock source 9-1 provides low phase noise, low
The clock signal of shake；Light arteries and veins after described laser instrument repetition rate lock 9-2, described in input for the described clock signal
Rush sequencer 1-1 it is sent with the repetition rate of pulse train and be adjusted, lock it on high stable clock source.Institute
Adjustable time delay 9-3 described in the clock signal input stated, controls time delay by back-end digital processing unit 8 so as to one
Be finely adjusted in the individual cycle, through when the clock signal delayed input again in phase-locked loop circuit 9-4, obtain a stable repetition
Frequency and electric analog-digital converter sample rate identical pulse signal, provide sampling clock for electric analog-to-digital conversion module 7 so as to can
Peak position sampling in electric pulse.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all spirit in the present invention and
Within principle, any modification, equivalent substitution and improvement done etc., should be included within the scope of the present invention.
Claims (5)
1. the configurable optical analog to digital conversion device of a kind of frequency response, including Optical Sampling clock generation module (1) it is characterised in that
Described Optical Sampling clock generation module (1) is by optical pulse sequence generator (1-1) and programmable optical pulse reshaper (1-2) structure
Become, the laser outbound course along described programmable optical pulse reshaper (1-2) is repetition rate multiplication modules (2), electricity successively
Optical modulator (3), optical multiplexer (4), photoelectric conversion module (5), electric filtration module (6), electric analog-to-digital conversion module (7) and
Digital processing element (8), described the first output end of digital processing element (8) and described programmable optical pulse reshaper
(1-2) control end is connected, and clock is synchronous to contain adjustable light delay with alignment module (9), described clock synchronous with align
The optical pulse sequence generator (1-1) of the first port of module (9) and described Optical Sampling clock generation module (1) and programmable
Line between optical pulse shaper (1-2) connects, the synchronous second port with alignment module (9) of described clock with described
Electric analog-to-digital conversion module (7) is connected, synchronous the 3rd port with alignment module (9) of described clock and described digital processing list
Second output end of first (8) is connected, and described clock is synchronous to receive described digital processing element (8) with alignment module (9)
Control, realize the synchronization to electric sampling clock and Optical Sampling pulse train and align, be sampled signal from described Electro-optical Modulation
The modulated terminal input of device (3)；
Described Optical Sampling clock generation module (1) produces the controlled light of time domain profile according to the configuration of digital processing element (8)
Pulse train, inputs electrooptic modulator after the repetition rate of repetition rate multiplication modules (2) multiplication Optical Sampling pulse train
(3)；The reception of this electrooptic modulator is sampled electric signal and carries out intensity modulated to light pulse sequence, and output intensity carries and is sampled electricity
The light pulse sequence of signal；This light pulse sequence enters described optical multiplexer (4), will carry the high speed being sampled signal
Optical Sampling pulse train is demultiplexing as N road low speed signal；Each road low speed signal of output all corresponds to photoelectric conversion module (5)
One optical-electrical converter and an electrical analogue wave filter of electric filtration module (6)；Photoelectric conversion module is every with electric filtration module
Road output is converted to data signal by electric analog-to-digital conversion module (7) again；N railway digital signal reconstructs through digital processing element to be adopted
The electric signal of sample, N is more than 1 integer.
2. the configurable optical analog to digital conversion device of frequency response according to claim 1 is it is characterised in that light pulse sequence
Generator produces the input that light pulse sequence sends into programmable optical pulse reshaper, under the control of digital processing element, right
The pulse profile of Optical Sampling clock is adjusted, and generation pulse profile meets design requirement and intensity is periodically variable in time
Optical signal, the frequency response to system configures.
3. the configurable optical analog to digital conversion device of frequency response according to claim 1 is it is characterised in that described clock
Synchronous have two types with alignment module：
The first includes adjustable optical delay line, optical-electrical converter and a phase-locked loop circuit, described optical pulse sequence generator
In the Optical Sampling clock input adjustable delay line sending, time delay is controlled by described digital processing element so as at one
It is finely adjusted in cycle, is converted to through optical-electrical converter and inputs in phase-locked loop circuit after electric signal again, by the output of phaselocked loop
Electric analog-to-digital conversion module described in signal input, as the sampling clock of electric analog-to-digital conversion module, makes electric analog-digital converter exist all the time
The peak of filtered electric pulse is sampled；
Second comprises high stable clock source, laser instrument repetition rate lock, adjustable time delay and a phase-locked loop circuit, high
Stabilizing clock source provides low phase noise, the clock signal of low jitter, and this clock signal is locked through described laser instrument repetition rate
After determining device, the repetition rate that the described optical pulse sequence generator of input sends pulse train to it is adjusted, and is locked
On high stable clock source；Adjustable time delay described in this clock signal input, described digital processing element controls adjustable prolonging
When device time delay so as to be finely adjusted in a cycle, through when the clock signal delayed input phase-locked loop circuit again
In, obtain a stable repetition rate and electric analog-digital converter sample rate identical pulse signal, for electric analog-to-digital conversion module
Sampling clock is provided, so that the peak of electric analog-digital converter electric pulse all the time after the filtering is sampled.
4. the configurable optical analog to digital conversion device of frequency response according to claim 1 is it is characterised in that described electrofiltration
The time domain width of ripple device impulse response is more than single sampling optical pulse time domain pulsewidth.
5. according to the configurable optical analog to digital conversion device of Claims 1-4 any one frequency response it is characterised in that whole be
The frequency response of system is configured by adjusting Optical Sampling clock and electrical filter, system equivalent impulse response hA(t) and Optical Sampling
Clock time domain waveform p (t) and the impulse response h of described electrical filterET () meets relation：hA(t)=Kp (- t) hET (), K is
Constant.
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| CN109856889B (en) * | 2019-03-25 | 2021-01-01 | 上海交通大学 | Automatic bias control device for parallel demultiplexing module of optical analog-to-digital conversion system |
| CN109856889A (en) * | 2019-03-25 | 2019-06-07 | 上海交通大学 | Optical analog to digital conversion system in parallel demultiplexing module automatic bias control device |
| CN110716366A (en) * | 2019-10-25 | 2020-01-21 | 电子科技大学 | Photoelectric mixed analog-digital conversion method and system based on optical delay |
| CN111176053A (en) * | 2020-02-19 | 2020-05-19 | 上海交通大学 | Monolithic integrated optical analog-digital conversion system based on lithium niobate-silicon wafer and preparation method |
| CN111650802A (en) * | 2020-07-01 | 2020-09-11 | 中国电子科技集团公司第三十八研究所 | Photon analog-digital conversion system based on coupled optoelectronic oscillator |
| CN113114249A (en) * | 2021-03-05 | 2021-07-13 | 电子科技大学 | Broadband high-speed optical sampling analog-digital converter implementation device and method |
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| CN114070689A (en) * | 2021-12-28 | 2022-02-18 | 屹世半导体(上海)有限公司 | OOK modulation and demodulation device |
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