CN104330940B - Produce the device of Nyquist light pulse based on ultra-wideband-light frequency comb - Google Patents
Produce the device of Nyquist light pulse based on ultra-wideband-light frequency comb Download PDFInfo
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- CN104330940B CN104330940B CN201410612689.3A CN201410612689A CN104330940B CN 104330940 B CN104330940 B CN 104330940B CN 201410612689 A CN201410612689 A CN 201410612689A CN 104330940 B CN104330940 B CN 104330940B
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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
- G02F2/00—Demodulating light; Transferring the modulation of modulated light; Frequency-changing of light
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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
- G02F2/00—Demodulating light; Transferring the modulation of modulated light; Frequency-changing of light
- G02F2/004—Transferring the modulation of modulated light, i.e. transferring the information from one optical carrier of a first wavelength to a second optical carrier of a second wavelength, e.g. all-optical wavelength converter
- G02F2/008—Opto-electronic wavelength conversion, i.e. involving photo-electric conversion of the first optical carrier
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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
- G02F2203/00—Function characteristic
- G02F2203/07—Polarisation dependent
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Abstract
A kind of device producing Nyquist light pulse based on ultra-wideband-light frequency comb, the present invention includes following part：Narrow linewidth laser, and the first wavelength division multiplexer, Polarization Controller, Fabry Perot electrooptic modulator, attemperating unit, photo-coupler, circulator, phase shift optical fiber Bragg grating, image intensifer, photodetector, electric amplifier, electric phase shifter, biasing T, direct current biasing, optical band pass filter, spectroanalysis instrument, quantum dot mode-locked laser, the second wavelength division multiplexer, multiple electrooptic modulator and photo-coupler.The present invention can overcome conventional electronics method in the inferior position of bandwidth, as the light source of fiber optic communication, can greatly improve the availability of frequency spectrum of optical fiber telecommunications system.
Description
Technical field
The invention belongs to optical fiber telecommunications system field, in particular it is a kind of transmission capacity of lifting optical fiber telecommunications system
Technology, a kind of based on ultra-wideband-light frequency comb produce Nyquist light pulse device.
Background technology
Fast development with cloud computing, interactively Video service and personal radio communication and being surging forward, optical-fiber network
The data rate of middle transmission is increased with the annual speed close to 29%.Although wavelength-division multiplex and time division multiplex combine and can significantly carry
The transmission capacity of high optical fiber telecommunications system, but still it is difficult to meet the transmission capacity of rapid growth.Face the transmission of rapid growth
Capacity, needs to extend optical transmission system and improves bandwidth availability ratio.At present, main technological means are conceived to reduction unit signal
Bands of a spectrum width improve the spectrum efficiency of system and take complicated high order modulation technique.Mainly there is orthogonal frequency in terms of improving spectrum efficiency
Divide multiplexing and nyquist pulse shaping technique, former concerns process the latter in frequency-region signal and pay close attention to signal procesing in time domain.?
Complicated high order modulation aspect, mainly adopts advanced advanced modulation formats, reaches the bit rate improving system transfers.But, adopt
Inevitably improve the complexity of system with senior modulation format, need complicated synchronization system and many level generators and
The electrical signal processing system of amplifier and complexity is so that bring substantial amounts of power attenuation.The spectral shape of nyquist pulse
Square and roll-off factor be 0, so can greatly improve the availability of frequency spectrum of optical fiber telecommunications system, and carry baud
The nyquist pulse of signal can be overlapping in time domain, the no demodulation of intersymbol interference.With respect to OFDM, Nai Kuisi
Special shaping pulse enormously simplify accepter complexity, to optical fiber non-linear insensitive, require lower accept bandwidth and
Lower peak value and average power ratio.
Therefore, produce the perfect nyquist pulse of high stability based on all-optical methods, improve system spectrum utilization rate
Increase optical fiber telecommunications system transmission capacity aspect and there is important strategic importance and urgent application demand.The Nai Kuisi producing
Special pulse should have tunable dutycycle and ultralow time jittering.
Content of the invention
In view of this, present invention is primarily targeted at providing a kind of ultra-wideband-light frequency comb that is based on to produce Nyquist light
The device of pulse, to overcome conventional electronics method in the inferior position of bandwidth, as the light source of fiber optic communication, can greatly improve light
The availability of frequency spectrum of fiber communication system.
For reaching above-mentioned purpose, the present invention provides a kind of dress producing Nyquist light pulse based on ultra-wideband-light frequency comb
Put, including：
One narrow linewidth laser；
One first wavelength division multiplexer, its input is connected with the outfan of narrow linewidth laser, this first wavelength division multiplexer
There are multiple outfans；
One Polarization Controller, its input is connected with an outfan of the first wavelength division multiplexer；
One Fabry-Perot electrooptic modulator, its port 1 is connected with the outfan of Polarization Controller；
One attemperating unit, its control end is connected with the port 2 of Fabry-Perot electrooptic modulator；
One photo-coupler, its port 1 is connected with the port 3 of Fabry-Perot electrooptic modulator；
One circulator, its port 1 is connected with the port 2 of photo-coupler；
One phase shift optical fiber Bragg grating, its input is connected with the port 2 of circulator；
One image intensifer, its input is connected with the port 3 of circulator；
One photodetector, its input is connected with the outfan of image intensifer；
One electric amplifier, its input is connected with the outfan of photodetector；
One electric phase shifter, its input is connected with the outfan of electric amplifier；
One biasing T, its port 1 is connected with the outfan of electric phase shifter；
One direct current biasing, its outfan is connected with the port 3 of biasing T；
One optical band pass filter, its input is connected with the port 3 of photo-coupler；
One spectroanalysis instrument, its input is connected with the outfan of optical band pass filter；
One quantum dot mode-locked laser, its outfan is connected with the outfan of narrow linewidth laser；
One second wavelength division multiplexer, its input is connected with the outfan of quantum dot mode-locked laser, for by quantum dot
The multi wave length illuminating source of mode-locked laser output is divided into multichannel by the second wavelength division multiplexer of coupling, often leads up to Electro-optical Modulation
Device modulation produces flat optical frequency com, and wideband frequency comb is divided into multiple channels；
Multiple electrooptic modulators, the input multiple outfans with the second wavelength division multiplexer respectively of each electrooptic modulator
Connect；
One photo-coupler, its input is connected with each outfan of multiple electrooptic modulators respectively, and Polarization Controller connects
Outfan in photo-coupler.
From technique scheme as can be seen that the invention has the advantages that：
1st, the device producing Nyquist light pulse based on ultra-wideband-light frequency comb that the present invention provides, due to using full light
The scheme of signal processing so overcoming inferior position in terms of bandwidth for the conventional electronics method, believe by the Nyquist light pulse of generation
Number time stability more preferable.
2nd, the device producing Nyquist light pulse based on ultra-wideband-light frequency comb that the present invention provides, due to utilizing light belt
Bandpass filter can be able to change between the frequency of optical frequency comb with effective control spectral width and by the frequency tuning light carrier
Every, the pulse-width tunable of nyquist pulse signal of generation and repetition rate is tunable, it is possible to achieve with all-optical network with
And light carries radio frequency network compatibility.
3rd, due to the optoelectronic oscillation system using frequency-tunable, therefore the time of the nyquist pulse signal of its generation trembles
Dynamic less, phase noise is low, therefore this nyquist pulse source can be used as the sampling source in optical analog to digital conversion system；The program
Related device is all the device that market can be bought, therefore the program can realize practical, Stability Analysis of Structures, with low cost.
Brief description
For making the object, technical solutions and advantages of the present invention become more apparent, below in conjunction with specific embodiment, and reference
Accompanying drawing, the present invention is described in more detail, wherein：
Fig. 1 is the structural representation of the device producing Nyquist light pulse based on ultra-wideband-light frequency comb that the present invention provides
Figure；
Fig. 2 is the device generation experiment knot producing Nyquist light pulse based on ultra-wideband-light frequency comb that the present invention provides
The similar figure of fruit.
Specific embodiment
The device producing Nyquist light pulse based on ultra-wideband-light frequency comb that the present invention provides, using light bandpass filtering
Device can effectively control the spectral width of the optical frequency comb of generation, and this patent is proposed first and produced using optical-electronic oscillator system
The raw tunable optical frequency comb of repetition rate.Using phase shift optical fiber Bragg grating narrow-band characteristic it is achieved that tunable list
Passband microwave photon filter, because the bandwidth of phase shift optical fiber Bragg grating is typically in 20MHz, can effectively realize
Phase place is to intensity-conversion.Because the purity of frequency spectrum of the microwave signal of optical-electronic oscillator generation is higher and phase noise characteristic is relative
More preferably, thus the time stability of the nyquist pulse producing more preferably, the time jitter of pulse can effectively improve.By adjusting
The bandwidth of humorous optical band pass filter can change the pulsewidth producing Nyquist wheat pulse；Wavelength by tuning light carrier is permissible
Realize the frequency-tunable of the microwave signal of optical-electronic oscillator, and then it is tunable to realize the repetition rate of optical frequency comb, you can be real
The repetition rate of existing Nyquist light pulse is tunable.In addition, by using quantum dot mode-locked laser and the second wavelength-division multiplex
Device is used in combination, can effective expansion optical frequency comb bandwidth, thus realizing the nyquist pulse of more narrow spaces.
According to knowable to Fourier transformation is theoretical, the Fourier transformation of nyquist pulse is square wave, therefore the Nai Kuisi of time domain
The corresponding frequency domain of special pulse is square frequency spectrum；The corresponding frequency spectrum of nyquist pulse sequence is square discrete spectrum for envelope,
Spectrum intervals is the inverse of nyquist pulse repetition period, and the pulsewidth of nyquist pulse is the frequency spectrum width of nyquist pulse
The inverse of degree.Therefore, produce perfect nyquist pulse condition be frequency domain be discrete frequency spectrum, and the power of discrete spectrum
Equal, the in addition PGC demodulation of various discrete spectrum.The pulsewidth of nyquist pulse is inversely proportional to the bandwidth of optical band pass filter how
The repetition rate of Qwest's pulse is consistent with the frequency interval of optical frequency comb.
As shown in figure 1, the device producing Nyquist light pulse based on ultra-wideband-light frequency comb that Fig. 1 is the present invention to be provided
Structural representation, this device includes narrow linewidth laser 1, the first wavelength division multiplexer 2, Polarization Controller 3, Fabry-Perot
Electrooptic modulator 4, temperature control system 5, photo-coupler 6, circulator 7, phase shift optical fiber Bragg grating 8, image intensifer 9, light electrical resistivity survey
Survey device 10, electric amplifier 11, the electric phase shifter 12, biasing T 13, direct current biasing 14, optical band pass filter 15, spectroanalysis instrument 16,
Optical Sampling oscillograph 17, quantum dot mode-locked laser 18, the second wavelength division multiplexer 19, electrooptic modulator 20-2n and photo-coupler
24.
Wherein, the device of Nyquist light pulse should be produced based on ultra-wideband-light frequency comb, including：
One narrow linewidth laser 1, its output port is connected with the input port of wavelength division multiplexer；
One first wavelength division multiplexer 2, its input is connected with the outfan of quantum dot mode-locked laser 1, this first wavelength-division
Multiplexer 2 has multiple outfans；
One Polarization Controller 3, its input is connected with an outfan of the first wavelength division multiplexer 2, described Polarization Controller 3
It is the Polarization Controller of the Polarization Controller of optical fiber structure, the Polarization Controller of waveguiding structure or space structure；
One Fabry-Perot electrooptic modulator 4, its port 1 is connected with the outfan of Polarization Controller 3, described Fabry-
Perot electrooptic modulator 4 adopts lithium columbate crystal, semi-conducting polymer or organic polymer；
One attemperating unit 5, its control end is connected with the port 2 of Fabry-Perot electrooptic modulator 4；
One photo-coupler 6, its port 1 is connected with the port 3 of Fabry-Perot electrooptic modulator 4；
One circulator 7, its port 1 is connected with the port 2 of photo-coupler 6；
One phase shift optical fiber Bragg grating 8, its input is connected with the port 2 of circulator 7；
One image intensifer 9, its input is connected with the port 3 of circulator 7, and described image intensifer 9 is semiconductor optical amplification
Device or mix jade or pearl earring fiber amplifier；
One photodetector 10, its input is connected with the outfan of image intensifer 9, and described photodetector 10 is photoelectricity
Diode or photomultiplier tube, using indium phosphide or silica-base material；
One electric amplifier 11, its input is connected with the outfan of photodetector 10；
One electric phase shifter 12, its input is connected with the outfan of electric amplifier 11；
One biasing T13, its port 1 is connected with the outfan of electric phase shifter 12；
One direct current biasing 14, its outfan is connected with the port 3 of biasing T13；
One optical band pass filter 15, its input is connected with the port 3 of photo-coupler 6, and described optical band pass filter 15 is
Waveform shaper optical filter based on Liquide Crystal On Silicon or wavelength division multiplexer；
One spectroanalysis instrument 16, its input is connected with the outfan of optical band pass filter 15；
One quantum dot mode-locked laser 18, its outfan is connected with the input of wavelength division multiplexer 2, for locking quantum dot
The second wavelength division multiplexer 2 that the multi wave length illuminating source of mode laser 1 output passes through coupling is divided into multichannel, often leads up to Electro-optical Modulation
Device modulation produces flat optical frequency com, wideband frequency comb is divided into multiple channels, wherein narrow linewidth laser 1 is used quantum
Point mode-locked laser 18 replaces, and the repetition rate of described quantum dot mode-locked laser 18 is 100GHz or 50GHz；
One second wavelength division multiplexer 19, its input is connected with the outfan of quantum dot mode-locked laser 18；
Multiple electrooptic modulator 20-2n, the input of each electrooptic modulator is many with the second wavelength division multiplexer 19 respectively
Individual outfan connects, and this electrooptic modulator 20-2n adopts lithium columbate crystal, semi-conducting polymer or organic polymer；
One photo-coupler 24, its input is connected with each outfan of multiple electrooptic modulator 20-2n respectively.
Wherein, narrow linewidth laser 1 is used for providing continuous optical signal to ripple the first wavelength-division division multiplexer 2；First wavelength-division is multiple
With device 2 be used for by mode-locked laser export multispectral wavelength-division multiplex, and then the bandwidth of expansion optical frequency comb are implemented separately, and
It is supplied to Polarization Controller 3；The polarization state that Polarization Controller 3 is used for adjusting continuous optical signal reduces polarization dependent loss and optimization
The modulation efficiency of Fabry Perot electrooptic modulator；Fabry-Perot electrooptic modulator 4 is used for producing the optical frequency of ultra broadband
Comb and be supplied to photo-coupler 6；Temperature control system 5 is used for tuning and controlling the chamber of Fabry-Perot-type cavity long, realizes phase matched；
Photo-coupler 6 is used for for the optical frequency comb of generation being divided into two bundles, and a branch of optical signal incides circulator 7, and another bundle incides light
Band filter 15；Circulator 7 is used for wideband frequency comb and incides phase shift optical fiber Bragg grating 8, and by phase shift optical fiber Bradley
The optical signal of lattice grating 8 reflection incides image intensifer 9；Phase shift optical fiber Bragg grating 8 is used for realizing phase-modulation to intensity
Modulation conversion is realized single-pass and with microwave photon filter and then is realized the optical-electronic oscillator of frequency-tunable, by tuning light carrier
Frequency realize the frequency tuning of microwave signal；Image intensifer 9 is used for the Insertion Loss of compensation link and improves opening of optical-electronic oscillator
Ring gain, and it is supplied to photodetector 10；Photodetector 10 is used for converting optical signal into required for the signal of telecommunication produces
Microwave signal；Electric amplifier 11 is used for amplifying the open-loop gain of the power raising optical-electronic oscillator that opto-electronic conversion produces the signal of telecommunication,
And it is supplied to the electric phase shifter 12；The electric phase shifter 12 is used for the phase place that adjustment produces the signal of telecommunication, realizes stable optoelectronic oscillation；Biasing
T 13 is used for the microwave signal of phase shift and DC signal incide the prevention at radio-frequency port of Fabry-Perot electrooptic modulator 4；Directly
Stream biasing 14 is passed through to finely tune static phase and then realize the efficient modulation of Fabry-Perot electrooptic modulator 4 to realize phase matched,
Produce Reflection Optical Thin Film frequency comb；Optical band pass filter 15 is used for controlling the bandwidth producing optical frequency com and then control to produce how Kui
The repetition rate of this special pulse, can be very good to suppress the power with outside mould of optical frequency com simultaneously；Spectroanalysis instrument 16
Produce the spectrogram of optical frequency com for observation；Optical Sampling oscillograph 17 is used for capture and produces Nyquist light pulse and at that time
Jitter；Quantum dot mode-locked laser 18 is used for the bandwidth of expansion optical frequency comb, by quantum dot laser is multiple with wavelength-division
With device combine can effective expansion optical frequency comb bandwidth；Second wavelength division multiplexer 19 is many for export quantum dot
Wavelength channels are divided into multichannel, and its function can substitute wavelength division multiplexer 2；Multiple electrooptic modulator 20-2n are used for producing broadband
Optical frequency com；Photo-coupler 24 is used for for the optical frequency com producing closing bundle；Wherein, module 18,19,20-2n, 24 be to expand
Exhibition system, closely can realize the controlled Nai Kuisi of pulsewidth with the bandwidth of expansion optical frequency by the use of quantum dot laser as light source
Special pulses generation.
The repetition rate of quantum dot mode-locked laser 1 can be 100GHz can also be 50GHz；
Polarization Controller 3 is the inclined of the Polarization Controller of optical fiber structure, the Polarization Controller of waveguiding structure or space structure
Shake controller；Fabry-Perot electrooptic modulator 4 and multiple electrooptic modulator 20-2n adopt lithium columbate crystal, semi-conductive polymeric
Thing (as silicon-based modulator, indium phosphide manipulator and III-V type manipulator) or organic polymer (as Graphene manipulator)；Light
Amplifier 9 can be semiconductor optical amplifier or mix jade or pearl earring fiber amplifier；Photodetector 10 is photodiode or light
Electric multiplier tube, using indium phosphide or silica-base material；Optical band pass filter 15 is the waveform shaping based on Liquide Crystal On Silicon
Device, or optical filter, or wavelength division multiplexer.
The Nyquist light pulse signal giving present invention generation as shown in Figure 2 produces result figure, and this figure is similar knot
Fruit is schemed；The abscissa of this figure is the time, and vertical coordinate is the normalization light intensity of light pulse；The repetition period of this pulse is 100ns,
Pulse bandwidth 90MHz, the full width at half maximum of pulse is 9.8ns.
Particular embodiments described above, has carried out detailed further to the purpose of the present invention, technical scheme and beneficial effect
Describe in detail bright, be should be understood that the specific embodiment that the foregoing is only the present invention, be not limited to the present invention, all
Within the spirit and principles in the present invention, any modification, equivalent substitution and improvement done etc., should be included in the guarantor of the present invention
Within the scope of shield.
Claims (8)
1. a kind of device producing Nyquist light pulse based on ultra-wideband-light frequency comb, including：
One narrow linewidth laser；
One first wavelength division multiplexer, its input is connected with the outfan of narrow linewidth laser, and this first wavelength division multiplexer has many
Individual outfan；
One Polarization Controller, its input is connected with an outfan of the first wavelength division multiplexer；
One Fabry-Perot electrooptic modulator, its port 1 is connected with the outfan of Polarization Controller；
One attemperating unit, its control end is connected with the port 2 of Fabry-Perot electrooptic modulator；
One photo-coupler, its port 1 is connected with the port 3 of Fabry-Perot electrooptic modulator；
One circulator, its port 1 is connected with the port 2 of photo-coupler；
One phase shift optical fiber Bragg grating, its input is connected with the port 2 of circulator；
One image intensifer, its input is connected with the port 3 of circulator；
One photodetector, its input is connected with the outfan of image intensifer；
One electric amplifier, its input is connected with the outfan of photodetector；
One electric phase shifter, its input is connected with the outfan of electric amplifier；
One biasing T, its port 1 is connected with the outfan of electric phase shifter；
One direct current biasing, its outfan is connected with the port 3 of biasing T；
One optical band pass filter, its input is connected with the port 3 of photo-coupler；
One spectroanalysis instrument, its input is connected with the outfan of optical band pass filter；
One quantum dot mode-locked laser, its outfan is connected with the outfan of narrow linewidth laser；
One second wavelength division multiplexer, its input is connected with the outfan of quantum dot mode-locked laser, for by quantum dot locked mode
The multi wave length illuminating source of laser instrument output is divided into multichannel by the second wavelength division multiplexer of coupling, often leads up to electrooptic modulator and adjusts
System produces flat optical frequency com, and wideband frequency comb is divided into multiple channels；
Multiple electrooptic modulators, the input of each electrooptic modulator is connected with multiple outfans of the second wavelength division multiplexer respectively
Connect；
One photo-coupler, its input is connected with each outfan of multiple electrooptic modulators respectively, and Polarization Controller is connected to light
The outfan of bonder.
2. the device producing Nyquist light pulse based on ultra-wideband-light frequency comb according to claim 1, wherein said
The repetition rate of quantum dot mode-locked laser is 100GHz or 50GHz.
3. the device producing Nyquist light pulse based on ultra-wideband-light frequency comb according to claim 1, wherein said
Polarization Controller is the Polarization Controller of the Polarization Controller of optical fiber structure, the Polarization Controller of waveguiding structure or space structure.
4. the device producing Nyquist light pulse based on ultra-wideband-light frequency comb according to claim 1, wherein said
Fabry-Perot electrooptic modulator adopts lithium columbate crystal, semi-conducting polymer or organic polymer.
5. the device producing Nyquist light pulse based on ultra-wideband-light frequency comb according to claim 1, plurality of
Electrooptic modulator adopts lithium columbate crystal, semi-conducting polymer or organic polymer.
6. the device producing Nyquist light pulse based on ultra-wideband-light frequency comb according to claim 1, wherein said
Image intensifer is semiconductor optical amplifier or mixes jade or pearl earring fiber amplifier.
7. the device producing Nyquist light pulse based on ultra-wideband-light frequency comb according to claim 1, wherein said
Photodetector is photodiode or photomultiplier tube, using indium phosphide or silica-base material.
8. the device producing Nyquist light pulse based on ultra-wideband-light frequency comb according to claim 1, wherein said
Optical band pass filter is the waveform shaper optical filter or wavelength division multiplexer based on Liquide Crystal On Silicon.
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| CN105610516A (en) * | 2015-12-24 | 2016-05-25 | 湖北工业大学 | Optical modulation method based on ultra-Nyquist system and corresponding demodulation method thereof |
| CN107508127B (en) * | 2017-09-28 | 2024-03-22 | 贵州大学 | Microwave photon signal frequency multiplication method and device with amplitude equalization effect |
| CN109616860A (en) * | 2019-02-12 | 2019-04-12 | 北京交通大学 | A kind of fiber amplifier |
| CN109981177B (en) * | 2019-04-04 | 2020-07-28 | 电子科技大学 | Single-wavelength all-optically adjustable second-order ultra-wideband signal generation method and device |
| JP7417320B2 (en) | 2019-07-17 | 2024-01-18 | 中国科学院半▲導▼体研究所 | Photonic chip and its manufacturing method |
| CN111404547B (en) * | 2020-03-25 | 2022-06-28 | 北京大学 | Broadband millimeter wave signal analog-to-digital conversion method and system |
| CN111786674B (en) * | 2020-07-09 | 2022-08-16 | 北京大学 | Analog bandwidth expansion method and system for analog-to-digital conversion system |
| CN111901042B (en) * | 2020-08-11 | 2022-03-11 | 中国电子科技集团公司第四十四研究所 | Phase modulation-based large dynamic signal demodulation model method |
| CN112383363B (en) * | 2020-10-29 | 2023-05-30 | 中国科学院半导体研究所 | Large bandwidth phased array receiving device based on frequency mixing technology |
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| CN1348629A (en) * | 1999-04-24 | 2002-05-08 | 摩托罗拉公司 | Method and apparatus for processing a digital signal for analog transmission |
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