CN103529618B - Based on phase-modulation and the time domain broadening A/D conversion system and method that go envelope technique - Google Patents
Based on phase-modulation and the time domain broadening A/D conversion system and method that go envelope technique Download PDFInfo
- Publication number
- CN103529618B CN103529618B CN201310489315.2A CN201310489315A CN103529618B CN 103529618 B CN103529618 B CN 103529618B CN 201310489315 A CN201310489315 A CN 201310489315A CN 103529618 B CN103529618 B CN 103529618B
- Authority
- CN
- China
- Prior art keywords
- signal
- road
- optical
- time domain
- light
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Optical Communication System (AREA)
Abstract
The invention provides a kind of based on phase-modulation and the time domain broadening A/D conversion system and method that go envelope technique, chirped light burst pulse generation device produces chirp Gauss light narrow pulse signal using mode-locked laser and dispersive optical fiber in the system；Pulsed optical signals are divided into 3 tunnels by radiofrequency signal time domain broadening device using optical branching device, radiofrequency signal phase-modulation is into the 1st road optical signal, subsequent 3 road optical signal is changed into 3 road electric signals of the time domain broadening of serial transmission by the processing such as Polarization Control, delay, coupling, amplification, dispersion, photodetection；Digital signal processing device receives the electric signal of 3 road time domain broadenings of serial input, utilizes coherent detection and the time domain broadening radiofrequency signal for going envelope algorithm to obtain no Gaussian envelope.Correspondence its frequency reduction of radiofrequency signal pulse width, the multiple of frequency reduction and the product of analog-to-digital conversion module efficiently sampling rate are the sample rate of A/D conversion system of the present invention.Using the system and method for the present invention, the Gaussian envelope of time domain broadening radiofrequency signal can effectively be removed, compared to more existing photon time domain broadening A/D conversion system, the time domain broadening radiofrequency signal that system and method is obtained is more accurate, adapts to the analog-to-digital conversion of high-frequency signal.
Description
Technical field
The present invention relates to the communication technology, more particularly to based on phase-modulation and the time domain broadening analog-to-digital conversion for going envelope technique
System and method.
Background technology
In recent years, electricity performance of analog-to-digital convertor is fast-developing, but its development speed is still much more slowly than data signal
The development speed of processing, the sample rate of current analog-digital converter is 80GSa/s, and analog bandwidth is 13GHz.It is logical for some modern times
Modulus turns in letter application, such as medical image system, radar communications system and other advanced electronic instruments, its Digital Signal Processing
The higher sample rate of needs and bigger input bandwidth are changed, traditional electricity performance of analog-to-digital convertor can not meet requirement.
In order to strengthen the efficiently sampling rate and input bandwidth of analog-digital converter, various photon technologies are suggested and proved.Its
The time domain broadening technology of the effect of dispersion reduction analog-digital converter input radio frequency signal rate of middle utilization optical fiber is taught by Jalali
Propose.Time domain broadening technology uses the ultrashort light pulse modulated radio signal handled by fiber dispersion effects, modulated optical signal
By dispersive optical fiber, cause the broadening of optical signal pulsewidth, the electric signal after photodetection is the radio frequency letter of time domain broadening
Number.Using photon time domain broadening technology, the situation of electricity analog-digital converter sample rate and input Bandwidth-Constrained is solved.
Fig. 1 is the structural representation of existing photon time domain broadening A/D conversion system.In conjunction with Fig. 1, to existing light
The structure of sub- time domain broadening A/D conversion system is illustrated, specific as follows：
Existing photon time domain broadening A/D conversion system includes：Chirped light burst pulse generation device 10, phase-modulation dress
Put 11, coherent detection device 12 and digital signal processing device 13.
Chirped light burst pulse generation device 10 is used to produce chirped light burst pulse, then by chirped light burst pulse through too high dispersion
Optical fiber is transmitted to phasing device 11.Wherein chirped light burst pulse generation device 10 includes：One super continuous spectrums laser 100
With an optical band pass filter 101.Super continuous spectrums laser 100 produces super continuous spectrums lightwave signal, is using centre frequency
1520nm, the bandpass filter section super continuous spectrums lightwave signal with a width of 20nm, produces chirped light burst pulse.
Phasing device 11 is used for modulation signal, realizes the when m- wavelength mapping of electric signal, and passes through high-dispersive
Fibre is transmitted to light detection device 12.Wherein phasing device 11 includes：Electric signal receiver 110, Mach zehnder modulators
111.Electric signal receiver 110 is used to receive high frequency electrical signal.Mach zehnder modulators 111 are used for the electric signal phase that will be received
Position is modulated in lightwave signal.
Coherent detection device 12 is used for the radiofrequency signal for demodulating time domain broadening.Wherein coherent detection device 12 includes：Local oscillator
Laser 120,180 degree frequency mixer 121, photodetector 122,123, erbium-doped fiber amplifier 124, signal processor 125, partially
Control loop of shaking 126, phase locking unit 127.Local oscillator laser 120 is produced to be believed with chirped light burst pulse generation device 10 with the light of frequency spectrum
Number.The light modulating signal received and local oscillator optical signal are mixed by 180 degree frequency mixer 121, then are exported respectively with two-way.Photoelectricity is visited
The two-way output that device 122,123 receives frequency mixer 121 respectively is surveyed, electric signal, two-way are converted light signals into by opto-electronic conversion
Electric signal does subtraction again, obtains the radiofrequency signal of time domain broadening.Erbium-doped fiber amplifier 124 is used for what compensation system was produced
Light loss.Signal processor 125, handles the time domain broadening radiofrequency signal received.Polarization Control loop 126, matching receives signal
With the polarization state of local oscillator optical signal.Phase locking unit 127 is used for the phase for locking fixed intermediate frequency.
The time domain broadening radiofrequency signal that 13 pairs of digital signal processing device is received carries out digital processing.Wherein data signal
Processing unit 13 includes bandpass filter 130, analog-digital converter 131 and digital signal processor 132.130 pairs of bandpass filter
The time domain broadening radiofrequency signal received is filtered.Analog-digital converter 131 is sampled to filtered time domain broadening radiofrequency signal,
It is data signal by analog-signal transitions.The data signal that the digital processing of digital signal processor 132 is received, realizes that high frequency is believed
Number analog-to-digital conversion.
Above-mentioned existing photon time domain broadening A/D conversion system method tentatively realize radiofrequency signal time domain broadening and
Digital Signal Processing, but its existing defects, two laser it cannot be guaranteed that possess the centre frequency and line width matched completely, its
Two photodetectors are it cannot be guaranteed that the responsiveness matched completely, its bandpass filter can not be removed after photodetector
The Gaussian envelope of time domain broadening radiofrequency signal.
The content of the invention
In view of this, it is an object of the invention to provide a kind of based on phase-modulation and the time domain broadening mould for going envelope technique
Analog-to-digital converting system, the system uses a laser and a photodetector, overcomes two lasers and two photoelectricity are visited
The defect that device is brought is surveyed, the system can effectively remove the Gauss of time domain broadening radiofrequency signal using envelope technique is gone in addition
Envelope.
Another object of the present invention is to provide a kind of based on phase-modulation and to go the time domain broadening modulus of envelope technique to turn
Method is changed, this method uses a laser and a photodetector, overcomes two lasers and two photodetectors
Envelope technique is gone in the defect brought, in addition this method utilization, can effectively remove the Gaussian envelope of time domain broadening radiofrequency signal.
In order to achieve the above object, technical method of the invention is specifically realized in：
It is a kind of based on phase-modulation and the time domain broadening A/D conversion system for going envelope technique, for producing time domain broadening
Radiofrequency signal, then pass through digital signal processor processes, it is characterised in that the system includes：Chirped light burst pulse generation device,
Radiofrequency signal time domain broadening device, digital signal processing device：
The chirped light burst pulse generation device utilizes the effect of dispersion of optical fiber, the ultrashort Gauss produced to mode-locked laser
Light impulse length is adjusted, and along with chirp, obtains the chirped light narrow pulse signal of pulse stretcher；The dispersion effect
When should be pulse signal and transmitting in a fiber, because different wave length has a different group velocitys in light source light spectrum composition, light pulse compared with
High frequency component is transmitted slowly than relatively low frequency component, therefore causes optical pulse broadening phenomenon；
The radiofrequency signal time domain broadening device includes optical branching module, phase modulation module, 180 degree frequency mixer, coupling
Module, detection module；The optical branching module carries out power distribution, the identical work(in 3 tunnels of output to every road signal using optical branching device
The optical signal of rate, the 1st road optical signal of output to phase modulation module；The phase modulation module enters line phase tune to radiofrequency signal
System, exports brewed optical signal to 180 degree frequency mixer；The 180 degree frequency mixer is to the 1st tunnel modulated optical signal and the 2nd road light
Signal is mixed, and the 2nd road signal of mixing output accesses coupling module jointly by optical delay line and the 1st road signal；It is described
Coupling module is coupled using two three-dB couplers to 3 road optical signals after processing, and 3 tunnel signal outputs after coupling are to mixing
Doped fiber amplifier, 3 road signals after amplification are transmitted in a fiber, and identical time domain broadening is produced by dispersion；The detection
Module converts light signals into electric signal by opto-electronic conversion, obtains 3 road time domain broadening electric signals of serial transmission；
The digital signal processing device includes analog-to-digital conversion module and digital signal processing module；The analog-to-digital conversion mould
The low speed telecommunication number of 3 tunnel serial transmissions of the block using analog-digital converter to receiving is sampled, and converts analog signals into number
Word signal, output to digital signal processing module；The digital signal processing module is using digital signal processor to receiving
3 road signals store respectively, the 1st road and the 2nd road signal realize coherent detection function by subtraction, and the signal after processing is again
Division operation is carried out with the 3rd road signal, that is, envelope algorithm is removed, so as to obtain the time domain broadening radiofrequency signal of no Gaussian envelope；
In said apparatus, the chirped light burst pulse generation device includes：
Mode-locked laser, for needed for generation system when a width of ps magnitudes ultrashort Gauss-pulse signal；
Optical fiber, transmits ultrashort Gauss-pulse signal, using fiber dispersion effects, light impulse length is adjusted, from
And obtain the chirped light burst pulse of pulse stretcher；
In said apparatus, the radiofrequency signal time domain broadening device includes：
Optical branching device, will receive chirped light narrow pulse signal and is divided into 3 tunnel identical pulsed optical signals, marked as the 1st road arteries and veins
Pulsed light signal, the 2nd road pulsed optical signals, the 3rd road pulsed optical signals；
Phase-modulator, the 1st tunnel light pulse is linked into phase-modulator, and a light pulse signal is as window, and capture is penetrated
Frequency signal, completes the when m- wavelength convert of radiofrequency signal；
Frequency mixer, the modulated signal and the light pulse on the 2nd tunnel that the 1st tunnel is produced passes through both Polarization Controller, matching respectively
Polarization state, then be respectively connected in 180 degree frequency mixer, be easy to subsequently complete coherent detection；
Coupler, the 1st road optical signal of frequency mixer output and the 2nd road optical signal coupling by optical delay line, are coupled defeated
Go out and coupled again with by the 3rd tunnel light pulse of Polarization Controller and optical delay line；
Erbium-doped fiber amplifier, the light loss that compensation system is produced；
Optical fiber, 3 road optical signals after transmission coupling, using fiber dispersion effects, light impulse length is adjusted, 3 tunnels
Optical signal undergoes identical broadening effect；
Photodetector, is detected the optical signal after radiofrequency signal time domain broadening device, is become using photoelectric effect
For electric signal；The photodetection is based on photoelectric effect, and under the irradiation of light, the electrons inside Cucumber are by photon excitation
Electric current is out formed, that is, converts optical signals into 3 road time domain broadening electric signals of serial transmission；3 tunnels of the serial transmission
Time domain broadening electric signal output is to digital signal processing device；
In said apparatus, the digital signal processing device includes：
Analog-digital converter, 3 road low speed telecommunications number of the serial transmission to receiving are sampled, and analog signal is switched into number
Word signal；
Digital signal processor, handles 3 road signals of serial transmission；In the digital domain, 3 road signals are stored respectively, wherein
1st road and the 2nd road signal realize coherent detection function by subtraction；Signal after processing carries out phase with the 3rd road signal again
Division operation, that is, go envelope technique, so as to obtain the time domain broadening radiofrequency signal of no Gaussian envelope；
It is a kind of based on phase-modulation and the time domain broadening D conversion method for going envelope technique, it is characterised in that this method
Including：
The ultrashort Gauss-pulse of a width of ps magnitudes, passes through light by the light pulse signal of output when A, mode-locked laser are produced
Fibre transmission, using the effect of dispersion of optical fiber, realizes the regulation of light impulse length, obtains the chirped light burst pulse letter of pulse stretcher
Number；
B, by optical branching device the light pulse after regulation is divided into 3 tunnels, the 1st optical signal enters line phase tune with radiofrequency signal
System, realizes m- wavelength mapping during radiofrequency signal, the 2nd tunnel is used as reference signal with the 3rd road optical signal；The reference signal can use
In time domain broadening radiofrequency signal of the demodulation containing Gaussian envelope；1st tunnel modulated signal and the 2nd road optical signal are controlled respectively through polarization
Device processed, obtains identical polarization state, then is respectively connected in 180 degree frequency mixer, is easy to subsequently complete coherent detection；The frequency mixer
1st road optical signal of output and the 2nd road optical signal of process optical delay line are by coupler, and the signal after coupling is again with passing through inclined
Shake the 3rd tunnel light pulse coupling of controller and optical delay line, be integrated into the road optical signal of serial transmission 3, output to Er-doped fiber is put
Big device；The system loss of the erbium-doped fiber amplifier thermal compensation signal；The road optical signal of serial transmission 3 is passed by dispersive optical fiber
It is defeated, signal output after broadening to photodetector；The optical signal that the photodetector detection is received, utilizes photoelectric effect
It is changed into 3 road time domain broadening electric signals of serial transmission；3 road time domain broadening electric signal outputs of the serial transmission are to numeral
Signal processing apparatus；
The low speed telecommunication number of 3 tunnel serial transmissions of the analog-digital converter to receiving is adopted in C, digital signal processing device
Sample, converts analog signals into data signal, output to digital signal processor；The digital signal processor is to receiving
3 road signals are stored respectively, and the 1st road and the 2nd road signal realize coherent detection function by subtraction, the signal after processing again with
3rd road signal carries out division operation, that is, envelope algorithm is removed, so as to obtain the time domain broadening radiofrequency signal of no Gaussian envelope；
The above method, the implementation method that chirped light burst pulse described in step A is produced includes：
A1, mode-locked laser generation time width are the ultrashort Gauss-pulse of ps magnitudes；
A2, the ultrashort Gauss-pulse produced are by one section of optical fiber, because the different frequency composition of light pulse is with different
Speed is propagated, so there is dispersion phenomenon in optical fiber transmission, using effect of dispersion, ultrashort Gauss-pulse width is adjusted
Section, so as to obtain the chirped light burst pulse of broadening；
The above method, the implementation method of radiofrequency signal time domain broadening includes described in step B：
B1, the optical signal after optical branching device is adjusted are divided into 3 tunnels, and the 1st road optical signal enters line phase tune with radiofrequency signal
System, realizes the when m- wavelength mapping of radiofrequency signal, the 2nd road optical signal and the 3rd road optical signal are used as reference signal；
Radiofrequency signal after B2, modulation passes through Polarization Controller, both polarization shapes of matching respectively with the 2nd road optical signal
State, then be respectively connected in 180 degree frequency mixer, it is easy to subsequently complete coherent detection；
The 1st road optical signal and pass through coupler, coupling by the 2nd road optical signal of optical delay line that B3, frequency mixer are exported
Signal afterwards is coupled with by the 3rd tunnel light pulse of Polarization Controller and optical delay line again, is integrated into 3 road light letters of serial transmission
Number, and export to erbium-doped fiber amplifier, using the amplification of erbium-doped fiber amplifier, compensation system is lost to optical signal
Influence；
B4, the optical signal of erbium-doped fiber amplifier output are transmitted in a fiber, and 3 road optical signals of serial transmission utilize optical fiber
Effect of dispersion produce identical time domain broadening；
The optical signal that B5, photodetector detection are received, 3 tunnel time domains of serial transmission are obtained using detecting technique
Broadening electric signal；
The above method, the implementation method of Digital Signal Processing includes described in step C：
3 road low speed telecommunications number of the serial transmission of C1, analog-digital converter to receiving are sampled, and analog signal is switched to
Data signal；
C2,3 road signals of digital signal processor processes serial transmission；In the digital domain, 3 road signals are stored respectively, its
In the 1st road and the 2nd road signal coherent detection function is realized by subtraction；Signal after processing is carried out with the 3rd road signal again
Division operation, that is, go envelope technique, so as to obtain the time domain broadening radiofrequency signal of no Gaussian envelope；
From above-mentioned technical method, the present invention provides a kind of based on phase-modulation and the time domain broadening for going envelope technique
A/D conversion system and method, can produce the time domain broadening radiofrequency signal of no Gaussian envelope, the radiofrequency signal that the system is produced
Time domain broadening width it is adjustable.
Brief description of the drawings
Fig. 1 is the structural representation of existing photon time domain broadening A/D conversion system.
Fig. 2 is the structural representation of the invention based on phase-modulation He the time domain broadening A/D conversion system for going envelope technique
Figure.
Fig. 3 is coherent detection of the present invention and removes envelope algorithm principle flow chart.
Fig. 4 is the flow chart of the invention based on phase-modulation He the time domain broadening D conversion method for going envelope technique.
Specific implementation method
, below will be according to referring to the drawings simultaneously for the purpose of the present invention, technical method and advantage is more clearly understood
For embodiment, the present invention is described in more detail.
The invention provides a kind of based on phase-modulation and the time domain broadening A/D conversion system and method that go envelope technique,
Chirp Gauss-pulse required for chirped light burst pulse generation device is produced in the system；Radiofrequency signal time domain broadening device will
The chirp Gauss-pulse signal of reception is divided into three road signals, the 1st road optical signal of output to phase modulation module through optical branching device
The radiofrequency signal received is modulated, the when m- wavelength mapping of radiofrequency signal is completed；1st road light modulating signal and the 2nd road optical signal point
Jing Guo not Polarization Controller, both polarization state of matching, then be respectively connected in 180 degree frequency mixer；1st road light of frequency mixer output
2nd road optical signal of signal and process optical delay line is by coupler, and the signal after coupling is again with passing through Polarization Controller and light
3rd tunnel light pulse coupling of delay line, integrates 3 road optical signals of serial serial transmission, and export to erbium-doped fiber amplifier；Put
Optical signal is transmitted in a fiber after big, and identical time domain broadening, output to photodetector are produced using the effect of dispersion of optical fiber；
Photodetector obtains 3 road time domain broadening electric signals of serial transmission using detecting technique；Digital signal processing device will
3 road time domain broadening electric signals of the serial transmission received are first sampled, and are data signal by analog-signal transitions；Numeral letter
Number processor stores 3 road signals respectively in the digital domain, wherein the 1st road and the 2nd road signal, which pass through subtraction, realizes relevant visit
Brake；Signal after processing carries out division operation with the 3rd road signal again, that is, envelope technique is gone, so as to obtain no Gaussian envelope
Time domain broadening radiofrequency signal；
Fig. 2 is the structural representation of the invention based on phase-modulation He the time domain broadening A/D conversion system for going envelope technique
Figure.In conjunction with Fig. 2, structure of the present invention based on phase-modulation and the time domain broadening A/D conversion system for going envelope technique is carried out
Illustrate, it is specific as follows：
The present invention is based on phase-modulation and goes the time domain broadening A/D conversion system of envelope technique to include：Chirped light burst pulse
Generation device 20, radiofrequency signal time domain broadening device 21, digital signal processing device 22.
Chirped light burst pulse generation device 20 is using the effect of dispersion of optical fiber, the Gauss-pulse produced to mode-locked laser
Width be adjusted, and along with chirp, obtain the chirped light burst pulse of broadening；The effect of dispersion is pulse signal
When transmitting in a fiber, because different wave length has different group velocitys, the higher frequency component of light pulse in light source light spectrum composition
Transmit slowly than relatively low frequency component, therefore cause optical pulse broadening phenomenon；
Radiofrequency signal time domain broadening device 21 include optical branching module, phase modulation module, frequency mixing module, coupling module,
Detection module；The optical branching module carries out power distribution using optical branching device to every road signal, exports the light of 3 road equal-wattages
Signal, the 1st road optical signal of output to phase modulation module；The phase modulation module carries out phase-modulation to radiofrequency signal, defeated
Go out brewed optical signal to frequency mixing module；The frequency mixing module is using 180 degree frequency mixer to the 1st tunnel modulated optical signal and the 2nd
Road optical signal is mixed, and the 2nd road signal of mixing output accesses coupling module jointly by delay and the 1st road signal；It is described
Coupling module is coupled using two three-dB couplers to 3 road optical signals after processing, and 3 tunnel signal outputs after coupling are to mixing
Doped fiber amplifier, 3 road signals are transmitted in a fiber after amplification, and identical time domain broadening is produced by dispersion；The detection mould
Block receives signal detection using detecting technique docking, obtains 3 road time domain broadening electric signals of serial transmission；
Digital signal processing device 22 includes analog-to-digital conversion module and digital signal processing module；The analog-to-digital conversion module
The low speed telecommunication number of the 3 tunnel serial transmissions using analog-digital converter to receiving is sampled, and converts analog signals into numeral
Signal, output to digital signal processing module；The digital signal processing module using digital signal processor to receive 3
Road signal is stored respectively, and the 1st road and the 2nd road signal realize coherent detection function by subtraction, the signal after processing again with
3rd road signal carries out division operation, that is, envelope algorithm is removed, so as to obtain the time domain broadening radiofrequency signal of no Gaussian envelope；
Wherein chirped light burst pulse generation device 20 includes 1 mode-locked laser, 200,1 section of dispersive optical fiber 201.
Mode-locked laser 200, for needed for generation system when a width of ps magnitudes ultrashort Gauss-pulse signal, output
To dispersive optical fiber 201；
Dispersive optical fiber 201, transmits ultrashort Gauss-pulse signal, and using fiber dispersion effects, light impulse length is carried out
Regulation, obtains the chirped light burst pulse of broadening；
Radiofrequency signal time domain broadening device 21 includes 1 signal receiver of phase-modulator 211,1 of optical branching 210,1
212,3 Polarization Controllers 213,214,215,1 frequency mixer, 216,2 Variable delay lines 217,218,2 couplers 219,
2110,1 2111,1 section of erbium-doped fiber amplifier photodetectors 2113 of dispersive optical fiber 2112,1.
Optical branching device 210, the pulse signal for chirped light burst pulse generation device to be transmitted is divided into three tunnels, and the 1st road is defeated
Go out to the road of phase-modulator the 211, the 2nd and the 3rd tunnel as reference signal, for demodulating the radiofrequency signal after modulation；
Phase-modulator 211 accesses the 1st tunnel light pulse, and a light pulse signal captures radiofrequency signal as window, completes
The when m- wavelength convert of radiofrequency signal, obtains modulated signal；
Signal receiver 212, receives radiofrequency signal；
Polarization Controller 213,214,215, keeps the consistent of 3 road optical signal polarization states；
The tunnel of frequency mixer the 216, the 1st produce modulated signal and the 2nd tunnel light pulse signal respectively by Polarization Controller,
Polarization state with both, then be respectively connected in 180 degree frequency mixer, it is easy to subsequently complete the biography of coherent detection, wherein frequency mixer
Defeated matrix is as follows：
The 1st road signal exported using formula (1) is the sum of two signals of input, and the 2nd road signal is the difference of two signals of input；
Variable delay line 217,218, the parallel serial conversion of 3 road signals, wherein time delay point are realized using two Variable delay lines
Wei not T1、T2；Variable delay line is an important parameter, and it must assure that 3 road signals are not overlapping；
Coupler 219,2110, in frequency mixer output two-way, the 2nd road optical signal is by optical delay line and the 1st road light letter
Number coupling, coupling output is coupled with by the 3rd tunnel light pulse of Polarization Controller and optical delay line again；
Erbium-doped fiber amplifier 2111, the light loss that compensation system is produced；
Optical fiber 2112,3 road optical signals after transmission coupling, using fiber dispersion effects, light impulse length is adjusted,
3 road optical signal experience identical broadening effects, wherein ceofficient of spread is determined by equation below：
M=1+L2/L1 (2)
Wherein L1For the length of optical fiber 201, L2For the length of optical fiber 2112；
Photodetector 2113, detects the optical signal after radiofrequency signal time domain broadening device, will using photoelectric effect
It is changed into 3 road time domain broadening electric signals of serial transmission, by the road time domain broadening electric signal output of serial transmission 3 after detection to number
Word signal processing apparatus 22；
Digital signal processing device 22 includes 1 analog-digital converter 220 and 1 digital signal processor 221.
Analog-digital converter 220,3 road low speed telecommunications number of the serial transmission to receiving are sampled, and analog signal is turned
For data signal；
Digital signal processor 221, handles the road electric signal of serial transmission 3 received, in the digital domain, the 1st road and the 2nd
Road signal realizes coherent detection function by subtraction, the time domain broadening radiofrequency signal containing Gaussian envelope is obtained, wherein in fact
The method of existing coherent detection function is as follows：
Wherein,
(3) I in formulach1And I (t)ch2(t) the 1st road respectively after photodetection and the 2nd road electric signal, Ech1_4
And E (t)ch2_4(t) it is respectively the 1st tunnel of serial transmission and the 2nd road optical signal, m=0, K after the second road optical fiber=(cε0n/
2)RPDAeff, wherein RPDFor detector responsivity, n is refractive index, and c is the light velocity, ε0It is permittivity of vacuum, AeffIt is having for optical fiber
Imitate mode field area；(4) T in formula0For the halfwidth degree of pulse, β2It is second order GVD；(5) formula is the phase as caused by dispersion
Position change.
Signal after processing and the 3rd road electric signal are subjected to division arithmetic, the Gauss bag of time domain broadening radiofrequency signal is removed
Network.Time domain broadening radiofrequency signal without Gaussian envelope is obtained by following algorithm：
Wherein I (t) is the signal by the output of coherent detection algorithm, Ich3(t) it is the 3rd tunnel reference signal, subtracting in above formula
Method algorithm removes direct current, and division algorithm removes envelope, and the time domain broadening radiofrequency signal of no Gaussian envelope is obtained by above-mentioned algorithm.
Fig. 3 is coherent detection of the present invention and removes envelope algorithm principle flow chart, and methods described can be by determination initial value
301st, the 1st circuit-switched data 302 is stored, time value 303, the 2nd circuit-switched data 304 of storage is judged, judges time value 305, the 3rd way of storage
According to 306, judge time value 307, coherent detection algorithm 308, remove envelope algorithm 309, circulate 10 steps such as next cycle 310
Composition.Wherein the sampled digital signal of 3 tunnel serial transmissions is changed into the 3 of parallel transmission by step 302,303,304,305,306
Railway digital signal, and 3 road signals are stored respectively.Flow chart is described as follows：
Step 301：Initial value is determined, the time delay T that such as two variable time delay lines are produced1、T2, the pulsewidth of chirped light burst pulse
The sample rate m of signal in space D, digital signal processor；
Step 302：Store the 1st circuit-switched data I1(t)；
Step 303：Judge whether time value t is equal to T1* m, if unequal, continues executing with step 302, then perform step
303, if equal, perform step 304；
Step 304：Store the 2nd circuit-switched data I2(t)；
Step 305：Judge whether time value t is equal to T2* m, if unequal, continues executing with step 304, then perform step
305, if equal, perform step 306；
Step 306：Store the 3rd circuit-switched data I3(t)；
Step 307：Judge whether time t is equal to D*m, if unequal, continue executing with step 306, then perform step
307, if equal, perform step 308；
Step 308：Perform coherent detection algorithm, i.e. the 1st road and the 2nd tunnel data storage carries out subtraction, obtain signal I
(t)；
Step 309：I (t) signals and 4 times of I that step 308 is obtained3(t) do subtraction, remove direct current signal, then with I3
(t) division arithmetic is done, so as to realize envelope algorithm；
Step 310：Next cycle is recycled to, several steps are repeated.
Fig. 4 is the flow chart of the invention based on phase-modulation He the time domain broadening D conversion method for going envelope technique.It is existing
With reference to Fig. 4, to the present invention is based on phase-modulation and goes the time domain broadening D conversion method flow of envelope technique to illustrate, have
Body is as follows：
Step 400：The ultrashort Gauss-pulse signal of a width of ps magnitudes when mode-locked laser is produced, by the light pulse of generation
By optical fiber, using the effect of dispersion of optical fiber, the regulation of the width of light pulse is realized, the chirped light burst pulse of broadening is obtained；
In this step, producing the method for chirp Gauss-pulse includes：
4001：The ultrashort Gauss-pulse signal of a width of ps magnitudes when mode-locked laser is exported, and phase is just the same,
Enter optical fiber by fiber coupler；
4002：The ultrashort Gauss-pulse produced is by one section of optical fiber, due to the different frequencies of light pulse transmitted in optical fiber
Rate composition is propagated at different rates, there is dispersion phenomenon in optical fiber transmission, using effect of dispersion, to ultrashort Gauss-pulse
Width is adjusted, so as to obtain the chirped light burst pulse of pulse stretcher；
Step 401：The light pulse after regulation is divided into 3 tunnels, the 1st road pulsed optical signals and radiofrequency signal by optical branching device
Phase-modulation is carried out, m- wavelength mapping during radiofrequency signal is realized, the 2nd tunnel is used as reference signal with the 3rd road pulsed optical signals；Institute
State reference signal and can be used for time domain broadening radiofrequency signal of the demodulation containing Gaussian envelope；1st tunnel modulated signal and the 2nd road optical signal
Respectively through Polarization Controller, both polarization states of matching, then it is respectively connected in 180 degree frequency mixer, is easy to follow-up completion relevant
Detection；1st road optical signal of the frequency mixer output and the 2nd road optical signal by delay are by coupler, the letter after coupling
Number coupled again with by the 3rd tunnel light pulse of Polarization Controller and optical delay line, be integrated into and export all the way to Erbium-doped fiber amplifier
Device；The system loss of the erbium-doped fiber amplifier thermal compensation signal, the signal after amplification is transmitted by optical fiber, and output to photoelectricity is visited
Survey device；The photodetector converts light signals into electric signal by opto-electronic conversion, obtains 3 road time domain broadenings of serial transmission
Electric signal；
In this step, producing the method for time domain broadening radiofrequency signal includes：
4011：Optical signal after optical branching device is adjusted is divided into 3 tunnels, and the 1st road optical signal enters line phase with radiofrequency signal
Modulation, realizes the when m- wavelength mapping of radiofrequency signal, the 2nd road optical signal and the 3rd road optical signal are used as reference signal；
4012：Radiofrequency signal after modulation passes through Polarization Controller, both polarizations of matching respectively with the 2nd road optical signal
State, then both are accessed in 180 degree frequency mixer, it is easy to subsequently complete coherent detection；
4013：The 1st road optical signal and access coupling jointly by the 2nd road optical signal of optical delay line that frequency mixer is exported
Device, signal after coupling is coupled with by the 3rd tunnel light pulse of Polarization Controller and optical delay line again, be integrated into export all the way to
Erbium-doped fiber amplifier, amplifies optical signal, the light loss that compensation system is produced；
4014：The optical signal of erbium-doped fiber amplifier output is transmitted by optical fiber, using the effect of dispersion of optical fiber, to light arteries and veins
Rush width to be adjusted, 3 road optical signal experience identical broadening effects；
4015：The optical signal that photodetector detection is received, converts light signals into electric signal by opto-electronic conversion, obtains
To 3 road electric signals of serial transmission；
Step 402：Analog-digital converter is to the low speed telecommunication number of the 3 tunnel serial transmissions received in digital signal processing device
Sampled, convert analog signals into data signal, output to digital signal processor；The digital signal processor docking
The 3 road signals received are stored respectively, and the 1st road and the 2nd road signal realize coherent detection function by subtraction, the letter after processing
Division operation is carried out with the 3rd road signal number again, that is, removes envelope algorithm, so as to obtain the time domain broadening radio frequency letter of no Gaussian envelope
Number；
In this step, digital signal processing method includes：
4021：3 road low speed telecommunications number of serial transmission of the analog-digital converter to receiving are sampled, and analog signal is turned
For data signal；
4022：3 road signals of digital signal processor processes serial transmission；In the digital domain, 3 road signals are stored respectively,
Wherein the 1st road and the 2nd road signal realize coherent detection function by subtraction；Signal after processing enters with the 3rd road signal again
Row division operation, that is, go envelope technique, so as to obtain the time domain broadening radiofrequency signal of no Gaussian envelope；
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
God is with principle, and any modification, equivalent substitution and improvements done etc. should be included within the scope of protection of the invention.
Claims (5)
1. it is a kind of based on phase-modulation and the time domain broadening A/D conversion system for going envelope technique, it is characterised in that the system bag
Include：Chirped light burst pulse generation device, radiofrequency signal time domain broadening device, digital signal processing device；
The chirped light burst pulse generation device utilizes the effect of dispersion of optical fiber, the ultrashort Gauss light arteries and veins produced to mode-locked laser
Rush width to be adjusted, and along with chirp, obtain the chirped light narrow pulse signal of broadening；The effect of dispersion is pulse
When signal is transmitted in a fiber, because different wave length has different group velocitys, the higher frequency of light pulse in light source light spectrum composition
Component transmits slowly than relatively low frequency component, therefore causes optical pulse broadening phenomenon；
The radiofrequency signal time domain broadening device include optical branching module, phase modulation module, 180 degree frequency mixer, coupling module,
Detection module；The optical branching module carries out power distribution using optical branching device to every road signal, exports the arteries and veins of 3 road equal-wattages
Pulsed light signal, the 1st road pulsed optical signals of output to phase modulation module；The phase modulation module is using phase-modulator to penetrating
Frequency signal carries out phase-modulation, exports brewed optical signal to 180 degree frequency mixer；The 180 degree frequency mixer is modulated to the 1st tunnel
Pulsed optical signals and the 2nd road pulsed optical signals are mixed, and two paths of signals is exported after mixing：1st road signal and the 2nd road signal,
2nd road signal by optical delay line and the 1st road signal the 1st coupling module of access jointly, its output again with it is defeated from optical branching device
Signal of the 3rd road pulsed optical signals gone out after optical delay line accesses the 2nd coupling module jointly；1st coupled mode
Block and the 2nd coupling module realize that 3 tunnel signal outputs after coupling to erbium-doped fiber amplifier are amplified using three-dB coupler
3 road signals afterwards are transmitted in a fiber, and identical time domain broadening is produced by dispersion；The detection module will by opto-electronic conversion
Optical signal is changed into electric signal, obtains 3 road time domain broadening electric signals of serial transmission；
The digital signal processing device includes analog-to-digital conversion module and digital signal processing module；The analog-to-digital conversion module profit
The low speed telecommunication number of the 3 tunnel serial transmissions with analog-digital converter to receiving is sampled, and converts analog signals into digital letter
Number, output to digital signal processing module；The digital signal processing module is using digital signal processor to 3 tunnels that receive
Signal is stored respectively, and the 1st road and the 2nd road signal realize coherent detection function by subtraction, and the signal after processing is again with the 3rd
Road signal carries out division operation, that is, envelope algorithm is removed, so as to obtain the time domain broadening radiofrequency signal of no Gaussian envelope.
2. according to claim 1 based on phase-modulation and the time domain broadening A/D conversion system for going envelope technique, it is special
Levy and be, the chirped light burst pulse generation device includes：
Mode-locked laser, for needed for generation system when a width of ps magnitudes ultrashort Gauss-pulse signal；
Optical fiber, transmits ultrashort Gauss-pulse signal, using fiber dispersion effects, light impulse length is adjusted, so that
To the chirped light burst pulse of broadening.
3. according to claim 1 based on phase-modulation and the time domain broadening A/D conversion system for going envelope technique, it is special
Levy and be, the radiofrequency signal time domain broadening device includes：
Optical branching device, will receive chirped light narrow pulse signal and is divided into 3 tunnel identical pulsed optical signals, marked as the 1st road pulsed light
Signal, the 2nd road pulsed optical signals, the 3rd road pulsed optical signals；
Phase-modulator, the 1st road pulsed optical signals are linked into phase-modulator, regard a pulsed optical signals as window, capture
Radiofrequency signal, completes the when m- wavelength convert of radiofrequency signal；
180 degree frequency mixer, the modulated signal and the light pulse on the 2nd tunnel that the 1st tunnel is produced passes through both Polarization Controller, matching respectively
Polarization state, then be respectively connected in 180 degree frequency mixer, be easy to subsequently complete coherent detection；
Coupling module, the 1st road optical signal of frequency mixer output and the 2nd road optical signal coupling by optical delay line, coupling output
Coupled again with the 3rd road optical signal by Polarization Controller and optical delay line；
Erbium-doped fiber amplifier, the light loss that compensation system is produced；
Optical fiber, 3 road optical signals after transmission coupling, using fiber dispersion effects, light impulse length is adjusted, 3 road light letters
Number experience identical broadening effect；
Photodetector, detects the optical signal after radiofrequency signal time domain broadening device, electricity is changed into using photoelectric effect
Signal；The photodetection is based on photoelectric effect, and under the irradiation of light, the electrons inside Cucumber are come out by photon excitation
And form electric current, that is, convert optical signals into 3 road electric signals of serial transmission；3 tunnel electric signal outputs of the serial transmission are extremely
Digital signal processing device.
4. it is a kind of based on phase-modulation and the time domain broadening D conversion method for going envelope technique, it is characterised in that this method bag
Include：
The pulsed optical signals of generation are passed through light by the ultrashort Gauss-pulse signal of a width of ps magnitudes when A, mode-locked laser are produced
Fibre, using the effect of dispersion of optical fiber, realizes the regulation of light impulse length, obtains the chirped light narrow pulse signal of pulse stretcher；
B, by optical branching device the pulsed optical signals after regulation are divided into 3 tunnels, the 1st road pulsed optical signals and radiofrequency signal carry out phase
Position modulation, realizes m- wavelength mapping during radiofrequency signal, the 2nd tunnel is used as reference signal with the 3rd road pulsed optical signals；The reference
Signal is used to demodulate the time domain broadening radiofrequency signal containing Gaussian envelope；1st tunnel modulated optical signal and the 2nd of optical branching device output the
Road optical signal is respectively through Polarization Controller, both polarization states of matching, then is respectively connected in 180 degree frequency mixer, is easy to follow-up
Complete coherent detection；The frequency mixer exports two ways of optical signals：1st road optical signal and the 2nd road optical signal, the 1st road optical signal and
The 2nd road optical signal by delay is by coupler, the signal after coupling and the 3rd tunnel by Polarization Controller and optical delay line
Pulsed optical signals are coupled again, are integrated into and are exported all the way to erbium-doped fiber amplifier；The erbium-doped fiber amplifier thermal compensation signal
System loss, the signal after amplification is transmitted by optical fiber, output to photodetector；The photodetector passes through opto-electronic conversion
Electric signal is converted light signals into, 3 road time domain broadening electric signals of serial transmission are obtained；
The low speed telecommunication number of 3 tunnel serial transmissions of the analog-digital converter to receiving is sampled in C, digital signal processing device,
Convert analog signals into data signal, output to digital signal processor；The digital signal processor is to 3 tunnels that receive
Signal is stored respectively, and the 1st road and the 2nd road signal realize coherent detection function by subtraction, and the signal after processing is again with the 3rd
Road signal carries out division operation, that is, envelope algorithm is removed, so as to obtain the time domain broadening radiofrequency signal of no Gaussian envelope.
5. method according to claim 4, it is characterised in that the implementation method that chirped light burst pulse described in step A is produced
Including：
A1, mode-locked laser generation time width are the ultrashort Gauss-pulse of ps magnitudes；
A2, the ultrashort Gauss-pulse produced are by one section of optical fiber, due to the different frequency composition of light pulse transmitted in optical fiber
Propagate at different rates, there is dispersion phenomenon in optical fiber transmission, using effect of dispersion, ultrashort Gauss-pulse width is entered
Row regulation, so as to obtain the chirped light burst pulse of pulse stretcher.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310489315.2A CN103529618B (en) | 2013-10-18 | 2013-10-18 | Based on phase-modulation and the time domain broadening A/D conversion system and method that go envelope technique |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310489315.2A CN103529618B (en) | 2013-10-18 | 2013-10-18 | Based on phase-modulation and the time domain broadening A/D conversion system and method that go envelope technique |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103529618A CN103529618A (en) | 2014-01-22 |
| CN103529618B true CN103529618B (en) | 2017-09-19 |
Family
ID=49931738
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310489315.2A Active CN103529618B (en) | 2013-10-18 | 2013-10-18 | Based on phase-modulation and the time domain broadening A/D conversion system and method that go envelope technique |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103529618B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114513259B (en) * | 2022-04-19 | 2022-07-29 | 电子科技大学 | Method and device for sampling and quantizing intensity-modulated optical signal |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20100087835A (en) * | 2009-01-29 | 2010-08-06 | 삼성전자주식회사 | Envelope elimination and restoration transmitter using modulated envelope signal and method using thereof |
| CN101806835B (en) * | 2010-04-26 | 2011-11-09 | 江苏中凌高科技有限公司 | Interharmonics measuring meter based on envelope decomposition |
-
2013
- 2013-10-18 CN CN201310489315.2A patent/CN103529618B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN103529618A (en) | 2014-01-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103575408B (en) | Coherent light detection system and method for optical fiber delay line phase control | |
| CN104567960B (en) | A kind of relevant Brillouin optical time domain analysis sensor-based system that light is detected based on phase-modulation | |
| CN102983910B (en) | Dispersion and non-linear compensation method and system in coherent optical communication system | |
| CN107528638A (en) | Wide-band microwave Direction-of-arrival method based on microwave photon filtering | |
| CN105634588B (en) | Coherent optical time domain reflectometer based on phase conjugation Shuangzi ripple | |
| CN106788704B (en) | The measuring system and method for less fundamental mode optical fibre intermode delay based on synchronizing sequence | |
| US20170019172A1 (en) | Using fractional Fourier transform nonlinear effects in optical fiber link monitoring methods | |
| CN105871464B (en) | A kind of radio optical communication system and modulation-demo-demodulation method | |
| CN106603158A (en) | High-precision distributed optical fiber frequency transfer method | |
| CN104296783B (en) | The sensing detection method and device of enhanced coherent light time domain reflection | |
| CN107219002A (en) | A kind of ultrahigh resolution spectral measurement method and system | |
| CN104113378A (en) | Apparatus and method capable of tuning microwave signal source of semiconductor optical amplifier | |
| CN107887783B (en) | A kind of photonic sampling system and method based on OEO | |
| CN104181748B (en) | Microwave pulse signal generating device based on light-operated nonlinear annular mirror | |
| CN104467969A (en) | Method for measuring chromatic dispersion of optical fiber link through fractional order Fourier transformation | |
| CN204439100U (en) | Dynamic distributed Brillouin light fiber sensing equipment | |
| CN110187867A (en) | The quantum random number generator of chip structure phase noise sampling | |
| US8532500B1 (en) | System and method for receiving optical signals | |
| CN103051375B (en) | Wireless laser communication heterodyne detection system and detection method thereof | |
| CN105187131B (en) | A kind of tunable wave length coherent optical detection system and method based on super continuous spectrums | |
| CN103812562B (en) | A kind of method and apparatus that extends passive optical-fiber network transmission range | |
| CN104168064A (en) | Microwave signal optical fiber stationary-phase transmission device based on back and forth phase correction | |
| CN105763245A (en) | Optical transceiving module | |
| CN103529618B (en) | Based on phase-modulation and the time domain broadening A/D conversion system and method that go envelope technique | |
| CN103913423A (en) | Pulse broadband light source high-capacity photonic crystal fiber gas detection method, and system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |