CN105319798A - Optical analog-to-digital conversion device with sampling rate capable of being reconfigured according to any power of 2 - Google Patents
Optical analog-to-digital conversion device with sampling rate capable of being reconfigured according to any power of 2 Download PDFInfo
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- CN105319798A CN105319798A CN201510785573.4A CN201510785573A CN105319798A CN 105319798 A CN105319798 A CN 105319798A CN 201510785573 A CN201510785573 A CN 201510785573A CN 105319798 A CN105319798 A CN 105319798A
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F7/00—Optical analogue/digital converters
Abstract
The invention relates to a high resolution reconfigurable optical analog-to-digital conversion method and device, in particular to an optical analog-to-digital conversion device with the sampling rate capable of being reconfigured according to any power of 2. The device comprises a pulse laser, a reconfigurable repetition frequency multiplication module, an electro-optic signal sampling module and a reconfigurable signal quantization and reconstruction module. According to the device, a high-stability passively mode-locked pulse laser is adopted as a system optical clock, and a heavy frequency multiplication module based on a multi-channel multiplexing technology is used, so that high speed optical clock signals can be effectively acquired. A switching device is used for changing channel numbers of the heavy frequency multiplication module and a back-end parallel photoelectric conversion and quantization module, so that multiplication of the light sampling rate is realized according to reconfigurability of power of 2, time delay and range matching are not required to be readjusted after marked, and the switching speed of the system in working states is guaranteed by quick response of the switching device. Besides, high speed optical sampling of electric signals is realized by the aid of an ultra broadband electro-optic modulator (or an electro-optic sampling gate), and finally, high speed optical analog-to-digital conversion is realized by the aid of parallel photoelectric conversion, parallel electric quantization and parallel data processing.
Description
Technical field
The present invention relates to a kind of optical information processing technical field, specifically a kind of sampling rate presses the reconfigurable optical mode analog-to-digital conversion apparatus of any power of 2.
Background technology
Optics modulus conversion technique (PADC) utilizes the high speed of photonics, the acquisition and processing of feature realization to high speed signal in broadband, have high sampling rate, large bandwidth, without electronic bottleneck and be convenient to the advantages such as parallel processing, be a kind of effective way realizing hypervelocity A/D conversion system.Propose multiple optical analog to digital conversion technical scheme at present, comprise the analog to digital converter of analog to digital converter that optics assists, Optical Sampling electricity, the analog to digital converter that electric sampled light quantizes, and all-light analog-digital converter.Wherein, the analog to digital converter of Optical Sampling electricity can utilize the advantages such as the electric quantification technique of the large bandwidth of photonics, high precision and maturation simultaneously, and become current optoelectronic areas one studies hot topic greatly.At present, two main development direction is superelevation sampling rate and superhigh precision respectively.For the former, for obtaining superelevation sampling rate, hyperchannel multiplex technique generally taked by the analog to digital converter of Optical Sampling electricity, as the scheme (T.R.Clark based on wavelength-division multiplex, J.U.KangandR.D.Esman, " Performanceofatimeandwavelengthinterleavedphotonicsample rforanalog-digitalconversion, " IEEEPhoton.Tech.Lett., vol.11, 1168 ~ 1169, 1999), with the scheme (A.YarivandR.G.M.P.Koumansetal. based on time-division multiplex technology, " Timeinterleavedopticalsamplingforultra-highspeedA/Dconve rsion, " ElectronicsLetters, 34 (21): 2012-2013, 1998).Performance based on the multiplexing optical analog to digital conversion scheme of hyperchannel depends on passage matching degree to a great extent, therefore extremely important (the Zou Weiwen of demarcation of passage coupling, Yang Guang, Huajie Zhang, Chen Jianping. the hyperchannel Nonmatched measurement method of ultra high-speed optical sampling clock and metrophia compensation device: China, CN201410567490.3,2014).
But on the other hand, for the analog input signal of different frequency range in the middle of practical application, the analog to digital converter of the different sampling rate of general needs, traditional analog-digital commutator is fixed sampling frequency, easily cause performance deficiency or waist performance for too high or too low incoming frequency, this just proposes requirement to the reconfigurability of Optical Sampling rate in optical analog to digital conversion.In the analog to digital conversion scheme that hyperchannel is multiplexing, for realizing the reconfigurability of Optical Sampling rate, generally can change repetition multiplication number by changing multiplex channel number, and then changing total Optical Sampling rate.But the destruction that the change of multiplex channel number often causes passage to mate, demarcates and mates and can cause the decline of the reconstruct speed of response again to passage.Therefore, in order to ensure performance and the reconstruct speed of response of optical analog to digital conversion system, under needing to propose a kind of prerequisite not destroying passage matching precision, the reconfigurable optical analog to digital conversion scheme of sampling rate is realized.
Summary of the invention
The object of the invention is to for above-mentioned the deficiencies in the prior art, propose a kind of sampling rate by 2 the reconfigurable optical mode analog-to-digital conversion apparatus of any power, adopt the passive mode-locking pulsed laser with high stability as system Optical Clock, use the repetition multiplication modules based on hyperchannel multiplex technique, effectively obtain high rate optical clock signal.Change the port number in repetition multiplication modules and the conversion of rear end parallel optoelectronic, quantization modules by switchgear wherein in this device, achieve Optical Sampling rate multiplication number by 2
k, wherein k=0,1,2,, the reconfigurability of N, its time delay and amplitude are mated once demarcation, again need not regulate, ensure that when passage bridge passage matching precision is constant, and ensure that the switch speed between system in working order by the quick response of switchgear.In addition, this device, by ultra wide band electrically photomodulator (or electro optic sampling door), realizes sampling to the high rate optical of electric signal, and by parallel optoelectronic conversion, parallel electricity and Synchronous data dispose, finally realizes the optical mode number conversion of two-forty.
Technical scheme of the present invention is as follows:
Described two-forty pulsed laser, for generation of the Optical Sampling clock with high stability, can adopt but be not limited to the realization of the method such as passive mode-locking fiber laser and multi-laser synthesis.
Described restructural repetition frequency multiplication modules is for generation of hyperchannel but the Optical Sampling clock at time interval according to the rules, and its implementation includes but not limited to Wave Decomposition multiplex technique and time-division multiplex technology.This module accesses switchgear in multiplex channel, controls wavelength division multiplexing access number, realize the restructural of Optical Sampling rate further by switchgear state.
Described electro-optical signal sampling module utilizes the sampling of large bandwidth electrooptic modulator realization to high-speed electrical signals, and electro optic sampling door exports as carrying the light pulse sequence being sampled signal message, and can be amplitude modulation(PAM), also can be the electro optic sampling modes such as phase-modulation.
Described restructural signal quantization and rebuild module and comprise restructural demultiplexing module, restructural parallel optoelectronic modular converter, restructural walk abreast electric quantization modules and restructural Synchronous data dispose module.
Described restructural demultiplexing module accesses switchgear in the channel, and its duty and clock generating module respective channel are consistent.
Described switchgear is used for control system multiplex channel number, its on-position and implementation are not limited to be realized by photoswitch in restructural repetition frequency multiplication modules, restructural demultiplexing module, and restructural is walked abreast in electric quantization modules, restructural Synchronous data dispose module and realized by electronic circuit and computer software.
Described restructural parallel optoelectronic modular converter comprises multiple input channel, each input channel has a photodetector (PD), for converting light signal to electric signal.
Described photodetector can adopt but be not limited to PIN pipe or APD pipe.
The described restructural electric quantization modules that walks abreast comprises the port number the same with restructural parallel optoelectronic modular converter, an output channel of each input channel homographic solution Multiplexing module.The input channel of each parallel electric quantization modules there is an electric analog to digital converter (EADC), for simulating signal is quantized into digital signal.
Described restructural Synchronous data dispose module comprises the input port identical with restructural parallel optoelectronic modular converter port number, data in all of the port finally input data processing unit, correct for being inputted by Multi-path electricity ADC and are combined into final digital signal.
Described data processing unit can adopt but be not limited to FPGA or DSP.
Described working state control module is controlled wavelength division multiplexing access number in system by gauge tap unit state, its system Optical Sampling rate of further control, its implementation includes but not limited to analog signal processing circuit, digital signal processor or computer software.
Based on above technical characterstic, the present invention has the following advantages:
1, based on hyperchannel multiplex technique, the restructural of Optical Sampling rate is realized by the reconfigurability of light pulse multiplex channel number.
2, adopt the switchgear with fast response characteristic to control working state of system, ensure that the response speed switched between different operating state.
3, its time delay and amplitude are mated once demarcation, need not again regulate, and ensure that the precision that passage mates remains unchanged in passage bridge process.
Accompanying drawing explanation
Fig. 1 is one embodiment of the present of invention figure
When Fig. 2 is N=3, restructural walks abreast wavelength-division multiplex electro optic sampling signal schematic representation
Fig. 3 is the schematic diagram that after port number reconstruct, matching precision is consistent, and a is port number is 2
2signal spectrum schematic diagram when=4.B is port number is 2
3signal spectrum schematic diagram when=8.
Embodiment
Specific embodiment of the present invention is provided below in conjunction with accompanying drawing.The present embodiment is implemented premised on technical scheme of the present invention, gives detailed embodiment and process, but protection scope of the present invention is not limited to following embodiment.
, pulsed laser 1 adopts laser with active-passive lock mould in the present embodiment as shown in Figure 1, and it exports repetition frequency is f
0the Optical Sampling clock 6 of=1/T.In restructural repetition frequency multiplication modules 2, the spectrum 7 of the Optical Clock that laser instrument produces is through one 2
nafter first multiplexer 2-1 of passage, generate 2
nroad has identical sample rate f
0optical Sampling clock.Access the first switchgear 2-2 in each passage and control its state by working state control module 5, achieving port number by 2
k, wherein k=0,1,2 ..., the reconfigurability of N.Each road exports after the passage matching module 2-3 of correspondence, jointly enters a demodulation multiplexer 2-4.Demodulation multiplexer 2-4 has 2
nindividual and different channel sample clocks output port one to one, now port number 2
k, k=0,1,2 ..., restructural, the sampling rate of N are f
0optical Sampling clock is merged into 1 tunnel serial, sampling rate is 2
kf
0, k=0,1,2 ..., the reconfigurable high-speed light sampling clock 7 of N.The reconstruct mechanism of reconfigurable high-speed light sampling clock 7 as shown in Figure 2,2
nthe individual passage matched is closed even number passage by the first switchgear 2-2 and is obtained 2
n-1individual coupling passage, total sampling rate reduces to 2
n-1f
0, by that analogy, finally can realize sampling rate is 2
kf
0, wherein k=0,1,2 ..., the reconfigurable high-speed light sampling clock 7 of N.
Optical Sampling clock 7 enters in electro-optical signal sampling module 3 as carrier wave, is sampled signal 3-2 and is loaded on carrier wave as shown in Fig. 3 (a) by an electrooptic modulator 3-1.Then the electro optic sampling pulse train that electric modulator 3-1 exports enters restructural signal quantization and rebuilds in module 4.Electro optic sampling pulse train needs first by the second multiplexer 4-1, and the port number of the second multiplexer 4-1 is 2
nindividual, identical with the port number in Optical Sampling clock, and access second switch device 4-2 equally in each channel.Under the control of control module 5 in working order, second switch device 4-2 is set to identical with the state of the first switchgear 2-2, thus the light pulse sequence of the electro optic sampling shown in Fig. 3 (b) is demultiplexed into each road sampling rate is f
0, port number is 2
k, wherein k=0,1,2 ..., the parallel pulse sequence of N.Then be converted to electric signal by the PD in restructural parallel optoelectronic modular converter 4-3, then sampling rate is f in restructural walks abreast electricity 4-4
0electric ADC be quantified as digital signal.Finally, all quantized result all enter in parallel restructural Synchronous data dispose module 4-5 carries out data processing and compound, obtains the digitized result being sampled signal.
In above process, provide Optical Clock by the laser with active-passive lock mould with high stability, by the repetition frequency doubling technology based on channel multiplexing, effectively guarantee the total sampling rate that system reaches higher.System adopts the electrooptic modulator with high bandwidth, adopts wavelength hyperchannel technology, ensure that the realization of high bandwidth, high precision electro Optical Sampling.System controls repetition multiplication factor by switchgear, achieves Optical Sampling rate multiplication number by 2
k, k=0,1,2 ..., the reconfigurability of N, its time delay and amplitude are mated once demarcation, need not again regulate, and ensure that the switch speed between system in working order by the quick response of switchgear.Native system can be widely used in the fields such as the high-speed wideband Signal acquiring and processing in the fields such as ULTRA-WIDEBAND RADAR, transient signal detection, antagonism, high-energy physics by the present invention.
Claims (2)
1. a sampling rate by 2 the reconfigurable optical mode analog-to-digital conversion apparatus of any power, it is characterized in that, comprise the pulsed laser (1), restructural repetition frequency multiplication modules (2), electro-optical signal sampling module (3) and the restructural signal quantization that connect successively and rebuild module (4), and respectively with described restructural repetition frequency multiplication modules (2), restructural signal quantization and rebuild the working state control module (5) that module (4) is connected.
2. sampling rate according to claim 1 presses the reconfigurable optical mode analog-to-digital conversion apparatus of any power of 2, and it is characterized in that, described restructural repetition frequency multiplication modules (2) comprises one 1 × 2
nfirst multiplexer (2-1) of passage, each output terminal of this first multiplexer (2-1) respectively through the first switchgear (2-2) and passage matching module (2-3) with one 2
neach input end of the demodulation multiplexer (2-4) of × 1 passage connects;
Described electro-optical signal sampling module (3) is electrooptic modulator (3-1), and the input end of this electrooptic modulator (3-1) is connected with the output terminal of described demodulation multiplexer (2-4);
Described restructural signal quantization and reconstruction module (4) comprise one 1 × 2
nsecond multiplexer (4-1) of passage, the input end of this second multiplexer (4-1) is connected with the output terminal of electrooptic modulator (3-1), and each output terminal of this two multiplexer (4-1) is connected with each input end of data processing unit (4-5) with electric analog to digital converter (EADC) (4-4) through second switch device (4-2), photodetector (4-3) respectively;
Described working state control module (5) is connected with second switch device (4-2) with described the first switchgear (2-2) respectively.
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| CN106990642A (en) * | 2017-05-31 | 2017-07-28 | 上海交通大学 | The optical analog to digital conversion device demultiplexed based on modulator multichannel |
| CN107748473A (en) * | 2017-11-16 | 2018-03-02 | 北京航天时代光电科技有限公司 | A kind of InP-base single-chip integration all-light analog-digital converter structure |
| CN107769778A (en) * | 2017-10-20 | 2018-03-06 | 成都康圣电子科技有限公司 | Signal sampling device and signal sampling calibration method |
| 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 |
| CN111045275A (en) * | 2020-01-06 | 2020-04-21 | 杭州电子科技大学 | Photon analog-to-digital conversion system and method based on hierarchical quantization principle |
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| CN106444215A (en) * | 2016-08-30 | 2017-02-22 | 上海交通大学 | Optical analog-digital converter with configurable frequency response |
| CN106444215B (en) * | 2016-08-30 | 2019-02-01 | 上海交通大学 | The configurable optical analog to digital conversion device of frequency response |
| CN106990642A (en) * | 2017-05-31 | 2017-07-28 | 上海交通大学 | The optical analog to digital conversion device demultiplexed based on modulator multichannel |
| CN106990642B (en) * | 2017-05-31 | 2019-07-05 | 上海交通大学 | Optical analog to digital conversion device based on modulator multichannel demultiplexing |
| CN107769778A (en) * | 2017-10-20 | 2018-03-06 | 成都康圣电子科技有限公司 | Signal sampling device and signal sampling calibration method |
| CN107769778B (en) * | 2017-10-20 | 2021-06-15 | 成都康圣电子科技有限公司 | Signal sampling device and signal sampling calibration method |
| CN107748473A (en) * | 2017-11-16 | 2018-03-02 | 北京航天时代光电科技有限公司 | A kind of InP-base single-chip integration all-light analog-digital converter structure |
| CN107748473B (en) * | 2017-11-16 | 2020-12-18 | 北京航天时代光电科技有限公司 | InP-based monolithic integrated all-optical analog-to-digital converter structure |
| 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 |
| CN111045275A (en) * | 2020-01-06 | 2020-04-21 | 杭州电子科技大学 | Photon analog-to-digital conversion system and method based on hierarchical quantization principle |
| CN114696828A (en) * | 2022-03-04 | 2022-07-01 | 电子科技大学 | Synchronous system of optical sampling and electric quantity |
| CN114696828B (en) * | 2022-03-04 | 2023-09-29 | 电子科技大学 | Synchronous system for light sampling and electric quantity |
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