CN106647102A - Ultra high-speed digital-to-analogue conversion method and device based on optical time domain compression - Google Patents
Ultra high-speed digital-to-analogue conversion method and device based on optical time domain compression Download PDFInfo
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- CN106647102A CN106647102A CN201611223440.9A CN201611223440A CN106647102A CN 106647102 A CN106647102 A CN 106647102A CN 201611223440 A CN201611223440 A CN 201611223440A CN 106647102 A CN106647102 A CN 106647102A
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- 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 discloses an ultra high-speed digital-to-analogue conversion method based on optical time domain compression. The method comprises the steps that firstly, ultra-short optical pulses are subjected to time domain widening, and chirped optical pulses are obtained; then analog electrical signals output by an electronic digital-to-analog converter are modulated on ultra-short optical pulses through an electro-optic intensity modulator; the modulated optimal pulse signals are subjected to time domain compression; finally, the optical signals obtained after time domain compression are subjected to photovoltaic conversion, and analogue electrical signals compressed on the time domain are obtained. The invention further discloses an ultra high-speed digital-to-analogue conversion device based on optical time domain compression. Compared with the prior art, DAC output with the higher sampling rate can be obtained without a high-speed electronic switch, and meanwhile a large effective bit digit is kept.
Description
Technical field
The present invention relates to a kind of digital-analog convertion method, more particularly to a kind of ultrahigh speed digital-to-analogue conversion compressed based on optical time domain
Method and device.
Background technology
Digital to analog converter (DAC) is widely used in field tools such as communication, radar, electronic warfare, electronic system tests, and device is adopted
Sample speed determines to a great extent the performance of system above with conversion accuracy.At present, the sampling rate of single channel electronic DAC
Several GHzs can be reached (referring to [S.Randel, et al., " Generation of a digitally shaped 55-
GBd 64-QAM single-carrier signal using novel high-speed DACs,”paper.M2A.3,
Optical Fiber Communication Conf.and Exposition 2014.]).Although and the sample rate of photon DAC
Can realize>The sample rate of 50GHz, but the bandwidth of modulator seriously limits the performance of system (referring to [Antonella
Bogoni,Xiaoxia Wu“160Gb/s All-Optical Binary-to-Quaternary Amplitude Shift
Keying Format Conversion,”Optical Fiber Communication Conference and
Exposition(OFC/NFOEC),pp.1-3,March,2011]).With the fast development of high-frequency wideband system, single channel
The sampling rate of DAC can not meet many application demands, and for example, transfer rate of future generation is the relevant of 400Gb/s or 1Tb/s
Optical communication system produce in the urgent need to DAC of the sample rate more than 40GSa/s many level quadrature amplitude modulation signal (referring to
[C.Laperle and M.O’Sullivan,“Advances in high-speed DACs,ADCs,and DSP for
optical coherent transceivers,”Journal of Lightwave Technology,vol.31,no.23,
pp.3780-3786,Dec.2013.])。
Multichannel DAC structure is a kind of means of the sampling rate of conventional lifting DAC, and it utilizes time-multiplexed original
Reason, by the low speed DAC output signals of multiple passages in time-domain multiplexed, can build the DAC of high speed.Leading to more based on electronic technology
Road DAC is generally switched over using speed-sensitive switch between multi-path low speed DAC output signals, makes not export different low speed in the same time
The information of DAC.Due to the product that the switching rate of speed-sensitive switch is low speed DAC sample rates and number of active lanes, this method is to electricity
The requirement of sub- switching rate is high, causes the room for promotion of DAC sampling rates very limited.Additionally, high-velocity electrons exist when
The shortcomings of jitter is big, anti-electromagnetic interference capability is poor also limit the performance using this multichannel DAC systems.On the other hand,
Although the sample rate of DAC can be greatly improved using photon technology, the significant bit digit for keeping electricity DAC higher is difficult.
Therefore, multichannel DAC structure how is improved to the lifting upper limit of sample rate and to improve its performance very meaningful.
The content of the invention
The technical problem to be solved is to overcome prior art not enough, there is provided a kind of to be compressed based on optical time domain
Ultrahigh speed digital-analog convertion method and device, can obtain the DAC outputs of higher sampling rate, while protecting without the need for high speed electronic switch
Hold larger significant bit digit.
The present invention specifically employs the following technical solutions solution above-mentioned technical problem：
Based on the ultrahigh speed digital-analog convertion method that optical time domain is compressed, first ultrashort light pulse is carried out into time domain broadening, obtained
Chirped optical pulse；Then the analog electrical signal that electronics digital to analog converter is exported is modulated to into the Zhou by electro-optic intensity modulator
Sing in light pulse；Time domain data compression is carried out to the light pulse signal after modulation；Finally the optical signal after time domain data compression is carried out into photoelectricity
Conversion, obtains the analog electrical signal compressed in time domain.
Optical Time Division Multiplexing Technology is combined on the basis of such scheme, technical scheme below is also obtained：
Based on the ultrahigh speed digital-analog convertion method that optical time domain is compressed, first ultrashort light pulse is carried out into time domain broadening, obtained
Chirped optical pulse is simultaneously classified as multichannel；To per chirped optical pulse all the way, respectively by the mould of an electronics digital to analog converter output
Intend electric signal to modulate thereon by electro-optic intensity modulator, the light pulse signal after the modulation of Bing Duige roads applies different time delays
After merge；Time domain data compression is carried out to light pulse signal after merging；Finally the optical signal after time domain data compression is carried out into photoelectricity to turn
Change, obtain being compressed in time domain and with the analog electrical signal of big time width.
The time domain broadening and time domain data compression can be by various existing or realize the technological means having, it is preferable that described
Time domain broadening and time domain data compression are realized by the dispersion interaction of dispersive medium, and time domain broadening uses color with time domain data compression
The abbe number value symbol of dispersion media is contrary.
Following two ultrahigh speed digiverters can also be obtained according to identical invention thinking：
Based on optical time domain compress ultrahigh speed digiverter, including：
Light source, for exporting ultrashort light pulse；
Time domain broadening unit, for carrying out time domain broadening to the ultrashort light pulse of light source output, so as to obtain chirped light arteries and veins
Punching；
Electronics digital to analog converter, for digital electric signal to be converted to into analog electrical signal；
Electro-optic intensity modulator, for the analog electrical signal that electronics digital to analog converter is exported to be modulated to into time domain broadening unit
On the chirped optical pulse of output；
Time domain data compression unit, for light pulse signal after the modulation that exports electro-optic intensity modulator time domain data compression is carried out；
Photodetector, for the optical signal after the time domain data compression that exports to time domain data compression unit opto-electronic conversion is carried out, and is obtained in time domain
On the analog electrical signal that compressed.
Based on optical time domain compress ultrahigh speed digiverter, including：
Light source, for exporting ultrashort light pulse；
Time domain broadening unit, for carrying out time domain broadening to the ultrashort light pulse of light source output, so as to obtain chirped light arteries and veins
Punching；
Optical branching device, for the chirped optical pulse that time domain broadening unit is exported to be divided into into multichannel；
One group of electronics digital to analog converter, its quantity is identical with the way that chirped optical pulse divides, for respectively by digital electricity
Signal is converted to analog electrical signal；
One group of electro-optic intensity modulator, its quantity is identical with electronics digital to analog converter quantity and corresponds, for respectively
The analog electrical signal that corresponding electronics digital to analog converter is exported is modulated on chirped optical pulse all the way；
One group of delay line, for applying different time delays to the light pulse signal after the modulation of each road；
Photo-coupler, merges for the light pulse signal after time delay Hou Ge roads are modulated；
Time domain data compression unit, for the light pulse signal after merging to be carried out into time domain data compression；
Photodetector, for the optical signal after the time domain data compression that exports to time domain data compression unit opto-electronic conversion is carried out, and is obtained
To being compressed in time domain and with the analog electrical signal of big time width.
Preferably, the time domain broadening unit, time domain data compression unit are dispersive medium, and both abbe number value symbols
It is number contrary.
Further, the device also includes：
Optical band pass filter, is connected between light source and time domain broadening unit, for entering to the ultrashort light pulse of light source output
Row frequency spectrum shaping.
Compared to existing technology, technical solution of the present invention has the advantages that：
1) present invention realizes superfast digital-to-analogue conversion using photon technology, without the need for the switching device of high speed, reduces and is
Requirement of the system to high speed device, can realize the DAC of higher rate；
2) present invention utilizes the time domain data compression of pulse, by low speed digital-to-analogue conversion modulates information pulse signal after the stretch
On, then the time domain width of pulse is compressed, so as to be capable of achieving the DAC outputs of higher rate；
3) present invention can utilize Optical Time Division Multiplexing Technology, multiple signals are multiplexed in time domain, so as to extend signal when
Field width degree；
4) because low -velocity electron DAC has very high significant bit digit, that is, the high precision of waveform is produced, this programme passes through
Output to low -velocity electron DAC carries out time domain data compression, is expected to keep higher significant bit digit, and the accuracy of waveform of generation is high.
Description of the drawings
Fig. 1 is the principle schematic diagram. of one specific embodiment of ultrahigh speed digiverter of the present invention；
Fig. 2 is the principle steps schematic diagram of ultrahigh speed digiverter of the present invention；
Fig. 3 is the structure principle chart of another specific embodiment of ultrahigh speed digiverter of the present invention.
Specific embodiment
Technical scheme is described in detail below in conjunction with the accompanying drawings：
The purpose of the present invention is：Using optical time domain the lifting for realizing digital-to-analogue conversion sample rate is compressed to overcome electronics multichannel
The problem that DAC sampling rates are limited by high-speed switching devices, the present invention basic ideas be：First by ultrashort light pulse in time domain
By the output signal of the electronics digital to analog converter of the upper low speed of electrooptic modulator modulation after stretching；Then by the optical signal after modulation
Time domain data compression is carried out, the low speed telecommunication number that light pulse envelope is carried also is compressed in time；Finally by the optical signal after compression
Opto-electronic conversion is carried out through photodetector, the output signal of ultrahigh speed digital-to-analogue conversion is obtained.
For the ease of public understanding technical solution of the present invention, below it is carried out with a specific embodiment further in detail
Describe in detail bright.
Fig. 1 shows the structural principle of one specific embodiment of ultrahigh speed digiverter of the present invention.As shown in figure 1,
The device includes：One ultrashort pulse laser, optical band pass filter, dispersive medium one, a two, low speed of dispersive medium
DAC, electrooptic modulator, a photodetector.Wherein, ultrashort pulse laser can produce the ultrashort pulse of femtosecond magnitude
Sequence；The dispersion values of dispersive medium one are D1；The dispersion values of dispersive medium two are D2(symbol of dispersion values and the phase of dispersive medium one
Instead).
The ultrashort light pulse that ultrashort pulse laser is produced carries out frequency spectrum shaping through optical band pass filter, so as to available
Flat spectrum；Light pulse after shaping after dispersive medium one, due to Different lightwave length in dispersive medium have difference
Speed is propagated, and result in the time explanation of pulse, produces chirped pulse signal；The output waveform signals of low speed DAC pass through electric light
Modulator is modulated on chirped pulse signal, forms modulated optical signal；Modulated optical signal carries out time domain through dispersive medium two
Compression, the low speed telecommunication number carried with optical pulse envelope is also compressed in time, so as to obtain high-speed digital-analog conversion signal；
Electric signal is converted optical signals in the high-speed digital-analog conversion signal input photodetector, you can obtain being pressed in time domain
The electric signal waveform output of contracting.
Fig. 2 is the principle steps schematic diagram of high-speed digital-analog conversion equipment.As shown in Fig. 2 what ultrashort pulse laser sent
Ultrashort light pulse, after optical band pass filter (such as waveshaper) flat spectrum is obtained, as shown in A points in Fig. 2.Shaping
Through dispersive medium one, (dispersion values are D to optical signal afterwards1, length is L1), GVD effect makes wavelength in dispersive medium one
In propagate at different rates, this process result in light pulse in time broadening formed chirped pulse signal, B in such as Fig. 2
Shown in point.It should be noted that the width after pulse stretching should be less than the inverse of its repetition rate.Then, chirped pulse leads to
The output waveform signals (sample rate is fGS/s) of the upper low speed DAC of electrooptic modulator modulation are crossed, as shown in C points in Fig. 2.After modulation
Signal send into dispersive medium two in (dispersion values are D2, length is L2), wherein D2With D1Symbol is contrary.Through dispersive medium two
After effect, chirp signal is compressed in time domain, and compression multiple is：
The low speed telecommunication number carried with optical pulse envelope is also compressed in time, as shown in D points in Fig. 2.Finally, should
Signal can be obtained by the output signal of high-speed digital-analog conversion after electro-optic conversion, as shown in E points in Fig. 2.The digital-to-analogue of output
The sample rate of conversion signal is Mxf, M times of as former sample rate.
Present invention preferably employs dispersive optical fiber is realizing time domain broadening and time domain data compression.On the one hand, dispersive optical fiber cost compared with
Low, on the other hand, dispersive optical fiber can be used as the gain media of light amplification, and amplifying with reference to fiber Raman can reduce digital-to-analogue conversion
Noise accumulation in journey, greatly improves the signal to noise ratio of signal, so as to improve the significant bit digit of digital-to-analogue conversion.
The sample rate of existing DAC can be improved many times by device proposed by the present invention, and the multiple of raising can be adjusted flexibly.
It should be noted that the expanded reach of sample rate finally by photodetector bandwidth and ultrashort pulse source limited.But mesh
The bandwidth of front photodetector can reach Terahertz, and if high-speed digital-analog conversion signal need not be transformed into into electricity
If domain, photodetector will not limit the upper limit of program sample rate.Meanwhile, put with reference to fiber Raman using dispersive optical fiber
Big mechanism realizes distributed air-defense while time domain is stretched or is compressed, and can greatly improve the signal to noise ratio of system, reduces
The impact of noise and non-linear logistic mould conversion performance, it is ensured that the high-speed digital-analog conversion signal of output has larger significant bit
Digit.
The present invention can also be by such scheme in combination with Optical Time Division Multiplexing Technology, so as to while sample rate is greatly improved
Further expand output waveform time width.The structural principle of the device is as shown in Figure 3.As shown in figure 3, the chirp signal for producing
Multichannel is divided into by photo-coupler (or optical branching device), the waveform signal of upper low speed DAC outputs is then modulated respectively and is introduced the time
Time delay.Signal synthesis after multichannel is processed is re-fed into afterwards carrying out time domain data compression in dispersive medium two all the way.It should be noted that
The time delayses between signal after the modulation of every road are suitably adjusted, to ensure after dispersive medium two no overlap between each signal
And it is continuous in time.Finally, the signal after compression carries out opto-electronic conversion through photodetector, obtains being compressed in time domain
Electric signal, the waveform of the signal is merging of all low speed DAC output waveforms in time domain.
Claims (10)
1. the ultrahigh speed digital-analog convertion method compressed based on optical time domain, it is characterised in that first ultrashort light pulse is carried out into time domain
Broadening, obtains chirped optical pulse；Then the analog electrical signal for electronics digital to analog converter being exported is adjusted by electro-optic intensity modulator
It is formed on the chirped optical pulse；Time domain data compression is carried out to the light pulse signal after modulation；Finally the light after time domain data compression is believed
Number opto-electronic conversion is carried out, obtain the analog electrical signal compressed in time domain.
2. method as claimed in claim 1, it is characterised in that the time domain broadening and time domain data compression are by the color of dispersive medium
It is scattered to act on realizing, and time domain broadening is contrary with the abbe number value symbol that time domain data compression uses dispersive medium.
3. the ultrahigh speed digital-analog convertion method compressed based on optical time domain, it is characterised in that first ultrashort light pulse is carried out into time domain
Broadening, obtains chirped optical pulse and is classified as multichannel；To per chirped optical pulse all the way, respectively by an electronics digital to analog converter
The analog electrical signal of output is modulated thereon by electro-optic intensity modulator, and the light pulse signal after the modulation of Bing Duige roads applies not
Merge after same time delay；Time domain data compression is carried out to light pulse signal after merging；Finally the optical signal after time domain data compression is entered
Row opto-electronic conversion, obtains being compressed in time domain and with the analog electrical signal of big time width.
4. method as claimed in claim 3, it is characterised in that the time domain broadening and time domain data compression are by the color of dispersive medium
It is scattered to act on realizing, and time domain broadening is contrary with the abbe number value symbol that time domain data compression uses dispersive medium.
5. the ultrahigh speed digiverter for being compressed based on optical time domain, it is characterised in that include：
Light source, for exporting ultrashort light pulse；
Time domain broadening unit, for carrying out time domain broadening to the ultrashort light pulse of light source output, so as to obtain chirped optical pulse；
Electronics digital to analog converter, for digital electric signal to be converted to into analog electrical signal；
Electro-optic intensity modulator, for the analog electrical signal that electronics digital to analog converter is exported to be modulated to into the output of time domain broadening unit
Chirped optical pulse on；
Time domain data compression unit, for light pulse signal after the modulation that exports electro-optic intensity modulator time domain data compression is carried out；
Photodetector, for the optical signal after the time domain data compression that exports to time domain data compression unit opto-electronic conversion is carried out, and is obtained
The analog electrical signal compressed in time domain.
6. device as claimed in claim 5, it is characterised in that the time domain broadening unit, time domain data compression unit are dispersion Jie
Matter, and both abbe number value symbols are contrary.
7. such as the described device of claim 5 or 6, it is characterised in that it also includes：
Optical band pass filter, is connected between light source and time domain broadening unit, for entering line frequency to the ultrashort light pulse of light source output
Spectrum shaping.
8. the ultrahigh speed digiverter for being compressed based on optical time domain, it is characterised in that include：
Light source, for exporting ultrashort light pulse；
Time domain broadening unit, for carrying out time domain broadening to the ultrashort light pulse of light source output, so as to obtain chirped optical pulse；
Optical branching device, for the chirped optical pulse that time domain broadening unit is exported to be divided into into multichannel；
One group of electronics digital to analog converter, its quantity is identical with the way that chirped optical pulse divides, for respectively by digital electric signal
Be converted to analog electrical signal；
One group of electro-optic intensity modulator, its quantity is identical with electronics digital to analog converter quantity and corresponds, for respectively by institute
The analog electrical signal of correspondence electronics digital to analog converter output is modulated on chirped optical pulse all the way；
One group of delay line, for applying different time delays to the light pulse signal after the modulation of each road；
Photo-coupler, merges for the light pulse signal after time delay Hou Ge roads are modulated；
Time domain data compression unit, for the light pulse signal after merging to be carried out into time domain data compression；
Photodetector, for the optical signal after the time domain data compression that exports to time domain data compression unit opto-electronic conversion is carried out, and is obtained
Compressed in time domain and with the analog electrical signal of big time width.
9. device as claimed in claim 8, it is characterised in that the time domain broadening unit, time domain data compression unit are dispersion Jie
Matter, and both abbe number value symbols are contrary.
10. such as the described device of claim 8 or 9, it is characterised in that it also includes：
Optical band pass filter, is connected between light source and time domain broadening unit, for entering line frequency to the ultrashort light pulse of light source output
Spectrum shaping.
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| CN108880695A (en) * | 2018-07-19 | 2018-11-23 | 浙江大学 | Photon continuous time compression set and its method |
| CN109450547A (en) * | 2018-10-17 | 2019-03-08 | 贵州大学 | A kind of the Wideband Signal Processing method and system |
| CN109981198A (en) * | 2019-04-10 | 2019-07-05 | 北京邮电大学 | A kind of wide band radio-frequency spectrum cognitive method and system based on multimode fibre |
| CN111208690A (en) * | 2020-04-23 | 2020-05-29 | 光子算数(北京)科技有限责任公司 | Optical digital-to-analog converter, signal processing system and photonic neural network chip |
| CN111610366A (en) * | 2020-05-15 | 2020-09-01 | 南京航空航天大学 | Broadband microwave measurement method and device based on ultrafast optical frequency sweep |
| CN111614402A (en) * | 2020-04-23 | 2020-09-01 | 复旦大学 | Terahertz PAM-4 signal generation system and method based on binary driving single modulator |
| CN112217564A (en) * | 2019-07-09 | 2021-01-12 | 中国海洋大学 | Pulse position modulation laser communication method based on chirped fiber grating pulse width compression technology |
| CN113219760A (en) * | 2021-04-28 | 2021-08-06 | 杭州电子科技大学 | Digital-to-analog conversion method and system based on spectrum shaping |
| CN113660036A (en) * | 2021-09-23 | 2021-11-16 | 南京航空航天大学 | Microwave signal time-frequency characteristic measuring method and device |
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| CN108880695A (en) * | 2018-07-19 | 2018-11-23 | 浙江大学 | Photon continuous time compression set and its method |
| CN109450547A (en) * | 2018-10-17 | 2019-03-08 | 贵州大学 | A kind of the Wideband Signal Processing method and system |
| CN109450547B (en) * | 2018-10-17 | 2021-06-15 | 贵州大学 | Broadband signal processing method and system |
| CN109981198A (en) * | 2019-04-10 | 2019-07-05 | 北京邮电大学 | A kind of wide band radio-frequency spectrum cognitive method and system based on multimode fibre |
| CN109981198B (en) * | 2019-04-10 | 2020-05-01 | 北京邮电大学 | Broadband radio frequency spectrum sensing method and system based on multimode optical fiber |
| CN112217564A (en) * | 2019-07-09 | 2021-01-12 | 中国海洋大学 | Pulse position modulation laser communication method based on chirped fiber grating pulse width compression technology |
| CN111208690A (en) * | 2020-04-23 | 2020-05-29 | 光子算数(北京)科技有限责任公司 | Optical digital-to-analog converter, signal processing system and photonic neural network chip |
| CN111614402A (en) * | 2020-04-23 | 2020-09-01 | 复旦大学 | Terahertz PAM-4 signal generation system and method based on binary driving single modulator |
| CN111610366A (en) * | 2020-05-15 | 2020-09-01 | 南京航空航天大学 | Broadband microwave measurement method and device based on ultrafast optical frequency sweep |
| CN111610366B (en) * | 2020-05-15 | 2021-10-08 | 南京航空航天大学 | Broadband microwave measurement method and device based on ultrafast optical frequency sweep |
| CN113219760A (en) * | 2021-04-28 | 2021-08-06 | 杭州电子科技大学 | Digital-to-analog conversion method and system based on spectrum shaping |
| CN113660036A (en) * | 2021-09-23 | 2021-11-16 | 南京航空航天大学 | Microwave signal time-frequency characteristic measuring method and device |
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