CN106896619A - Analog-digital commutator and method based on photon stretching - Google Patents
Analog-digital commutator and method based on photon stretching Download PDFInfo
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Abstract
The invention discloses a kind of analog-digital commutator based on photon stretching and method, high-speed radio-frequency signal is modulated onto light pulse by electrooptic modulator, by dispersive optical fiber, pulse can obtain broadening, then by obtaining originally inputting radiofrequency signal after photodetector by the version of time-stretching, slowed down by frequency reducing equivalent to signal, signal sampling is completed by the modulus conversion chip of low speed again, reduce the sample rate requirement to ADC, improve the frequency of input signal, distortion is introduced finally by digital signal processing unit to digital radio signal to compensate, obtain quality radiofrequency signal high.The present invention can effectively reduce the frequency of input radio frequency signal, and the sampling and treatment of high-frequency signal are completed using the modulus conversion chip of low speed, reduce the difficulty of high-speed sampling, be easy to the treatment of Wideband/Ultra-Wideband signal.
Description
Technical field
The invention belongs to field of signal processing, and in particular to a kind of analog-digital commutator and method based on photon stretching.
Background technology
Analog-to-digital conversion device (ADC) has a wide range of applications in various occasions, and different application scenarios has different requirements to the sampling rate and precision of ADC, due in high-frequency range, being limited to the time jitter of electronic device and the uncertain characteristic of comparator, it is difficult to by electric analog-to-digital conversion device（Electric ADC）Sampling rate bring up to 20 more than GS/s.In fact, the developing steps of electricity ADC have been difficult to catch up with the digital integrated electronic circuit and Digital Signal Processing in high speed development.According to statistics, could be improved 1.5 bit every 8 years precision indexs of electricity ADC technologies, so, largely, electric ADC turns into the Main Bottleneck of the super-broadband tech in fast development.That is, the need for the sampling rate of current electric ADC and input bandwidth are also far from application is met.
The content of the invention
It is an object of the invention to provide a kind of analog-digital commutator based on photon stretching and method, radiofrequency signal can be realized by radio frequency signal frequency reduction of speed by the present invention, analog-to-digital conversion is realized using the modulus conversion chip of low speed, solve the problem of radiofrequency signal high-speed sampling.
The technical solution for realizing the object of the invention is：A kind of analog-digital commutator based on photon stretching,Including the pulsed laser source being sequentially connected,First dispersive optical fiber,Electrooptic modulator,Second dispersive optical fiber,Photodetector,Electric analog-digital converter and digital signal processing unit,The burst pulse light of pulse laser output,By the first dispersive optical fiber,Effect pulsed light by dispersion is broadened,Feeding electrooptic modulator,Radiofrequency signal enters electrooptic modulator simultaneously,Modulated radio signal and the pulsed light being broadened in electrooptic modulator,So that radiofrequency signal is by preliminary broadening,And it is sent to the second dispersive optical fiber,Effect pulsed light by dispersion is broadened again,Accordingly,Radiofrequency signal is also broadened,And it is sent to photodetector,Obtain originally inputting radiofrequency signal by the version of time-stretching,Electric analog-digital converter is sent into afterwards,Carry out signal sampling,Obtain digital radio signal,And it is sent to digital signal processing unit,Digital signal processing unit introduces distortion and compensates to digital radio signal,Obtain quality radiofrequency signal high.
Further, the electric analog-digital converter uses low speed modulus conversion chip.
Further, the introducing distortion is that Modulation and Nonlinear compensation and pulse envelope are eliminated.
A kind of D conversion method of the analog-digital commutator based on photon stretching, step is as follows：
Step 1, the burst pulse light of pulse laser output, by the first dispersive optical fiber, the effect pulsed light by dispersion is broadened, and electrooptic modulator is sent into, while pending high-speed radio-frequency signal enters electrooptic modulator.
Step 2, modulated radio signal and the pulsed light being broadened in electrooptic modulator, by on rf-signal modulation to the pulsed light being broadened, i.e. so that radiofrequency signal is by preliminary broadening, and it is sent to the second dispersive optical fiber, effect pulsed light by dispersion is broadened again, accordingly, radiofrequency signal is also broadened, and is sent to photodetector.
Step 3, through photodetector after, obtain originally inputting radiofrequency signal and be decelerated by the version of time-stretching, i.e. signal, electric analog-digital converter is sent into afterwards, carry out signal sampling, obtain digital radio signal, and be sent to digital signal processing unit.
Step 4, digital signal processing unit introduce distortion and compensate to digital radio signal, obtain quality radiofrequency signal high.
Further, in the step 3, electric analog-digital converter uses low speed modulus conversion chip.
Further, in the step 4, the compensation for introducing distortion for Modulation and Nonlinear, pulse envelope elimination.
Compared with prior art, its remarkable advantage is the present invention：The frequency of input radio frequency signal can be effectively reduced, the sampling and treatment of high-frequency signal are completed using the modulus conversion chip of low speed, reduce the difficulty of high-speed sampling, be easy to the treatment of Wideband/Ultra-Wideband signal.
Brief description of the drawings
Fig. 1 is the structure flow chart of the analog-digital commutator based on photon stretching of the invention and method.
Fig. 2 is untreated radio frequency signal frequency schematic diagram in the embodiment of the present invention 1, wherein（a）It is radio frequency signal frequency schematic diagram,（b）For（a）Partial enlarged drawing.
In Fig. 3 embodiment of the present invention 1 it is processed by the invention after radio frequency signal frequency schematic diagram, wherein（a）It is the radio frequency signal frequency schematic diagram after treatment,（b）For（a）Partial enlarged drawing.
Specific embodiment
The present invention is described in further detail below in conjunction with the accompanying drawings.
Relative to electric analog-digital converter（Electric ADC）, photon ADC is then with various advantages.First, compared with traditional electric ADC, photon ADC has sampling rate higher.With the development of photoelectric technology, the clock jitter of light impulse source shakes two orders of magnitude less than electronic clock, has reached fs magnitudes, and this makes it possible to realize the ADC higher than 100 GS/s, is also achieved that the RF switching bandwiths of 50 GHz.Secondly, the photon ADC for being realized by optical fiber technology, due to the intrinsic anti-electromagnetic-radiation of fibre-optic waveguide and the ability of various electromagnetic interferences, thus can obtain more superior interference free performance.
With reference to Fig. 1,A kind of analog-digital commutator based on photon stretching,Including the pulsed laser source being sequentially connected,First dispersive optical fiber,Electrooptic modulator,Second dispersive optical fiber,Photodetector,Electric ADC and digital signal processing unit,The burst pulse light of pulse laser output,By the first dispersive optical fiber,Effect pulsed light by dispersion is broadened,Feeding electrooptic modulator,Radiofrequency signal enters electrooptic modulator simultaneously,Modulated radio signal and the pulsed light being broadened in electrooptic modulator,So that radiofrequency signal is by preliminary broadening,And it is sent to the second dispersive optical fiber,Effect pulsed light by dispersion is broadened again,Accordingly,Radiofrequency signal is also broadened,And it is sent to photodetector,Obtain originally inputting radiofrequency signal by the version of time-stretching,It is decelerated equivalent to radiofrequency signal,Realize the reduction of speed to the radiofrequency signal being input into,Electricity ADC is sent into afterwards,Carry out signal sampling,Obtain digital radio signal,And it is sent to digital signal processing unit,Digital signal processing unit introduces distortion and compensates to digital radio signal,Obtain quality radiofrequency signal high.
The electric ADC uses low speed modulus conversion chip, reduces the sample rate requirement to ADC.
The introducing distortion is that Modulation and Nonlinear compensation and pulse envelope are eliminated.
A kind of D conversion method based on photon stretching, method and step is as follows：
Step 1, the burst pulse light of pulse laser output, by the first dispersive optical fiber, the effect pulsed light by dispersion is broadened, and electrooptic modulator is sent into, while pending high-speed radio-frequency signal enters electrooptic modulator.
Step 2, modulated radio signal and the pulsed light being broadened in electrooptic modulator, by on rf-signal modulation to the pulsed light being broadened, i.e. so that radiofrequency signal is by preliminary broadening, and it is sent to the second dispersive optical fiber, effect pulsed light by dispersion is broadened again, accordingly, radiofrequency signal is also broadened, and is sent to photodetector.
Step 3, through photodetector after, obtain originally inputting radiofrequency signal and be decelerated by the version of time-stretching, i.e. signal, electric analog-digital converter is sent into afterwards, carry out signal sampling, obtain digital radio signal, and be sent to digital signal processing unit.Wherein electric analog-digital converter uses low speed modulus conversion chip.
Step 4, digital signal processing unit introduce distortion and compensate to digital radio signal, obtain quality radiofrequency signal high.Wherein introduce compensation, pulse envelope elimination of the distortion for Modulation and Nonlinear.
Embodiment 1
With reference to Fig. 1, a kind of analog-digital commutator based on photon stretching, including the pulsed laser source being sequentially connected（Full width at half maximum is 300fs）, (length is 2km to the first dispersive optical fiber, and abbe number is 20
Ps2/km), electrooptic modulator（Radio frequency bandwidth is the single armed mach zhender intensity modulator of 20GHz）, the second dispersive optical fiber（Length is 20km, and abbe number is 20 ps2/km）, photodetector（Responsiveness is 0.8 A/W, and responsive bandwidth is 10 GHz）, electricity ADC（Sample rate is 2Gs/s, and nominal digit is 10）And digital signal processing unit,The burst pulse light of pulse laser output,By the first dispersive optical fiber,Effect pulsed light by dispersion is broadened,Feeding electrooptic modulator,Radiofrequency signal enters electrooptic modulator simultaneously,Modulated radio signal and the pulsed light being broadened in electrooptic modulator,So that radiofrequency signal is by preliminary broadening,And it is sent to the second dispersive optical fiber,Effect pulsed light by dispersion is broadened again,Accordingly,Radiofrequency signal is also broadened,And it is sent to photodetector,Obtain originally inputting radiofrequency signal by the version of time-stretching,The time-stretching factor is 10 times,10 times have been decelerated equivalent to radiofrequency signal,Realize the reduction of speed to the radiofrequency signal being input into,Electricity ADC is sent into afterwards,Carry out signal sampling,Obtain digital radio signal,And it is sent to digital signal processing unit,Digital signal processing unit introduces distortion and compensates to digital radio signal,Obtain quality radiofrequency signal high.
A kind of D conversion method based on photon stretching, method and step is as follows：
Step 1, the burst pulse light of pulse laser output, by the first dispersive optical fiber, the effect pulsed light by dispersion is broadened, and electrooptic modulator is sent into, while pending high-speed radio-frequency signal enters electrooptic modulator.
Step 2, modulated radio signal and the pulsed light being broadened in electrooptic modulator, by on rf-signal modulation to the pulsed light being broadened, i.e. so that radiofrequency signal is by preliminary broadening, and it is sent to the second dispersive optical fiber, effect pulsed light by dispersion is broadened again, accordingly, radiofrequency signal is also broadened, and is sent to photodetector.
Step 3, through photodetector after, obtain originally inputting radiofrequency signal and be decelerated by the version of time-stretching, i.e. signal, electric analog-digital converter is sent into afterwards, carry out signal sampling, obtain digital radio signal, and be sent to digital signal processing unit.Wherein electric analog-digital converter uses low speed modulus conversion chip.
Step 4, digital signal processing unit introduce distortion and compensate to digital radio signal, obtain quality radiofrequency signal high.Wherein introduce compensation, pulse envelope elimination of the distortion for Modulation and Nonlinear.
With reference to Fig. 2 and Fig. 3, from Fig. 2（b）In as can be seen that input radiofrequency signal frequency be 20GHz, by device of the invention after, from Fig. 3（b）In it can be seen that the frequency of the radiofrequency signal of output is 2GHz, 10 times of frequency reduction, equivalent to the drawing effect realized to 10 times of signal time domain.
Claims (6)
1. it is a kind of based on photon stretching analog-digital commutator, it is characterised in that：Including the pulsed laser source being sequentially connected,First dispersive optical fiber,Electrooptic modulator,Second dispersive optical fiber,Photodetector,Electric analog-digital converter and digital signal processing unit,The burst pulse light of pulse laser output,By the first dispersive optical fiber,Effect pulsed light by dispersion is broadened,Feeding electrooptic modulator,Radiofrequency signal enters electrooptic modulator simultaneously,Modulated radio signal and the pulsed light being broadened in electrooptic modulator,So that radiofrequency signal is by preliminary broadening,And it is sent to the second dispersive optical fiber,Effect pulsed light by dispersion is broadened again,Accordingly,Radiofrequency signal is also broadened,And it is sent to photodetector,Obtain originally inputting radiofrequency signal by the version of time-stretching,Electric analog-digital converter is sent into afterwards,Carry out signal sampling,Obtain digital radio signal,And it is sent to digital signal processing unit,Digital signal processing unit introduces distortion and compensates to digital radio signal,Obtain quality radiofrequency signal high.
2. it is according to claim 1 based on photon stretching analog-digital commutator, it is characterised in that：The electric analog-digital converter uses low speed modulus conversion chip.
3. it is according to claim 1 based on photon stretching analog-digital commutator, it is characterised in that：The introducing distortion is that Modulation and Nonlinear compensation and pulse envelope are eliminated.
4. it is a kind of based on photon stretching analog-digital commutator D conversion method, it is characterised in that step is as follows：
Step 1, the burst pulse light of pulse laser output, by the first dispersive optical fiber, the effect pulsed light by dispersion is broadened, and electrooptic modulator is sent into, while pending high-speed radio-frequency signal enters electrooptic modulator；
Step 2, modulated radio signal and the pulsed light being broadened in electrooptic modulator, by on rf-signal modulation to the pulsed light being broadened, i.e. so that radiofrequency signal is by preliminary broadening, and it is sent to the second dispersive optical fiber, effect pulsed light by dispersion is broadened again, accordingly, radiofrequency signal is also broadened, and is sent to photodetector；
Step 3, through photodetector after, obtain originally inputting radiofrequency signal and be decelerated by the version of time-stretching, i.e. signal, electric analog-digital converter is sent into afterwards, carry out signal sampling, obtain digital radio signal, and be sent to digital signal processing unit；
Step 4, digital signal processing unit introduce distortion and compensate to digital radio signal, obtain quality radiofrequency signal high.
5. it is according to claim 4 based on photon stretching D conversion method, it is characterised in that：In the step 3, electric analog-digital converter uses low speed modulus conversion chip.
6. it is according to claim 4 based on photon stretching D conversion method, it is characterised in that：In the step 4, the compensation for introducing distortion for Modulation and Nonlinear, pulse envelope elimination.
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Cited By (6)
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| CN108880695A (en) * | 2018-07-19 | 2018-11-23 | 浙江大学 | Photon continuous time compression set and its method |
| 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 |
| CN110411587A (en) * | 2019-07-03 | 2019-11-05 | 武汉大学 | One kind stretching imaging device and method based on pulse modulated ultrafast time domain |
| 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 |
| CN111404547A (en) * | 2020-03-25 | 2020-07-10 | 北京大学 | Broadband millimeter wave signal analog-to-digital conversion method and system |
| CN113612556A (en) * | 2021-07-28 | 2021-11-05 | 清华大学 | Integrated multi-node spectrum sensing method and device |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108880695A (en) * | 2018-07-19 | 2018-11-23 | 浙江大学 | Photon continuous time compression set and its method |
| 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 |
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| 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 |
| CN111404547A (en) * | 2020-03-25 | 2020-07-10 | 北京大学 | Broadband millimeter wave signal analog-to-digital conversion method and system |
| CN113612556A (en) * | 2021-07-28 | 2021-11-05 | 清华大学 | Integrated multi-node spectrum sensing method and device |
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Application publication date: 20170627 |