CN106093879B - A kind of phase-coded signal generating means based on electric light Fa-Po cavity - Google Patents
A kind of phase-coded signal generating means based on electric light Fa-Po cavity Download PDFInfo
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- CN106093879B CN106093879B CN201610416164.1A CN201610416164A CN106093879B CN 106093879 B CN106093879 B CN 106093879B CN 201610416164 A CN201610416164 A CN 201610416164A CN 106093879 B CN106093879 B CN 106093879B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/28—Details of pulse systems
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Abstract
A kind of phase-coded signal generating means based on electric light Fa-Po cavity, belong to photoelectronics phase coding technology field.Described device includes: phase-modulator, for electric signal to be carried out double sideband modulation by modulation carrier wave；Electro-optical transducer Fa-Po cavity, for carrying out disharmonious filtering processing to the signal after double sideband modulation by square wave control signal, to select carrier wave and upper side band signal to pass through, or selection carrier wave and lower sideband signal pass through；Detector obtains phase-coded signal for the carrier wave and upper side band signal that detect or the carrier wave and lower sideband signal to be carried out photoelectric conversion.The present invention carries out disharmonious filtering to the signal after double sideband modulation by square wave control signal and handles the quick selection that may be implemented to signal, quickly to generate phase-coded signal, and the encoded signal code rate generated is fast, in addition, since structure simply reduces the cost and energy consumption of generation phase-coded signal.
Description
Technical field
The present invention relates to a kind of phase-coded signal generating means based on electric light Fa-Po cavity, belong to photoelectronics phase volume
Code technical field.
Background technique
Phase coding technology is a kind of means of pulse compression, has important application in radar system.Existing electric light
Son learns phase coding technology and is such as based on stimulated Brillouin scattering, is based on tunable laser and Bragg grating system to light source
Intensity, tunability it is more demanding, and system bulk is big, energy consumption is high, these all limit the phase based on electric photonics
Application of the coding techniques in radar system.
Summary of the invention
The present invention provides a kind of phase-coded signal generating means based on electric light Fa-Po cavity, to solve in the prior art
Electric photonics phase coding technology requires height, and the problem that system bulk is big, energy consumption is high to the intensity of light source, tunability, is
This present invention adopts the following technical scheme that:
A kind of phase-coded signal generating means based on electric light Fa-Po cavity, comprising:
Phase-modulator, for electric signal to be carried out double sideband modulation by modulation carrier wave；
Electro-optical transducer Fa-Po cavity, for being carried out at disharmonious filtering by square wave control signal to the signal after double sideband modulation
Reason, to select carrier wave and upper side band signal to pass through, or selection carrier wave and lower sideband signal pass through；
Detector, for carrying out the carrier wave and upper side band signal that detect or the carrier wave and lower sideband signal
Photoelectric conversion obtains phase-coded signal.
Phase-coded signal generating means of the present invention based on electric light Fa-Po cavity are by square wave control signal to double
Signal after sideband modulation carries out disharmonious filtering and handles the quick selection that may be implemented to signal, compiles quickly to generate phase
Code signal, and generate encoded signal code rate it is fast, in addition, due to structure simply reduce generate phase-coded signal at
Sheet and energy consumption.
Detailed description of the invention
Fig. 1 is the flow diagram of the generation method of a phase-coded signal described in the embodiment of the present invention；
Fig. 2 is that the structure of the phase-coded signal generating means based on electric light Fa-Po cavity described in the embodiment of the present invention is shown
It is intended to；
Fig. 3 is the structure of another phase-coded signal generating means based on electric light Fa-Po cavity described in the embodiment of the present invention
Schematic diagram；
Fig. 4 is electric light wave in the phase-coded signal generating means based on electric light Fa-Po cavity described in the embodiment of the present invention
Lead the structural schematic diagram of Fa-Po cavity 220.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Present embodiment provides a kind of generation method of phase-coded signal, as shown in Figure 1, comprising:
S110, electric signal is subjected to double sideband modulation by modulation carrier wave.
Specifically, modulation carrier wave is generated by mono-colour laser, and modulation carrier wave can be single-frequency optical signals, amplitude and wavelength
It is not construed as limiting.As optional, electric signal can be generated by signal source, and the frequency of electric signal should be 0.5* full width at half maximum+n*
Free Spectral Range, wherein n is positive integer, and the Free Spectral Range FSR=c/2nL of electro-optical transducer Fa-Po cavity, c is laser in formula
Wavelength, n are medium refraction index, and L is that chamber is long；The amplitude of electric signal should meet small signal modulation, that is, the sideband generated after modulating
It only needs to consider single order sideband, second order or can be ignored with upper side band.
S120, disharmonious filtering processing is carried out to the signal after double sideband modulation by square wave control signal, to select carrier wave
Pass through with upper side band signal, or selection carrier wave and lower sideband signal pass through.
Specifically, the square wave control signal controls the filter function of electro-optical transducer Fa-Po cavity by the voltage of square-wave signal
The mobile signal to after double sideband modulation carries out disharmonious filtering processing, and to select carrier wave and upper side band signal to pass through, or selection carries
Wave and lower sideband signal pass through.
As optional, apply square wave control signal on electro-optical transducer Fa-Po cavity, which passes through square wave
Low and high level V1 and V2 realize.It can be pressed down by the way that the signal after step S110 double sideband modulation is carried out disharmonious filtering processing
System falls one of sideband, and to generate electric signal, therefore the filter function position by changing electro-optical transducer Fa-Po cavity may be implemented
Disharmonious filtering processing, when square wave control information control voltage is V1, the upper side band signal of the signal generation after double sideband modulation
It is suppressed, so that carrier wave and lower sideband signal pass through；Letter when square wave control information control voltage is V2, after double sideband modulation
Number generate lower sideband signal be suppressed so that carrier wave and upper side band signal pass through, due to carrier wave and upper side band signal or carrier wave
With the phase just phase difference of pi of lower sideband signal, then, the signal that detector detects just will appear π phase shift.
S130, the carrier wave and upper side band signal that detect or the carrier wave and lower sideband signal are subjected to photoelectricity turn
Get phase-coded signal in return.
Specifically, the difference frequency signal for detecting the carrier wave and disharmonious filtering treated upper side band signal, by the difference frequency
Signal carries out photoelectric conversion and obtains phase-coded signal；Or,
The difference frequency signal for detecting the carrier wave and disharmonious filtering treated lower sideband signal, the difference frequency signal is carried out
Photoelectric conversion obtains phase-coded signal
The embodiment of the present invention is described as follows in citing:
As electric signal v (t)=V cos (wt), the angular frequency for modulating carrier wave is wcWhen, double-side band is carried out through ovennodulation carrier wave
Modulated light field are as follows:
E1(t)=J1(βπ)cos[(wc-w)t+π/2]+J0(βπ)cos(wct)+J1(βπ)cos[(wc+w)t+π/2]
Wherein β=V/Vπ, VπFor the half-wave voltage of phase-modulator, J is Bessel function, preceding two generations in above formula
Difference frequency signal are as follows: i1(t)=α J0(βπ)J1(β π) cos [wt- pi/2], α indicates the responsiveness of detector in formula；Two generations afterwards
Difference frequency signal are as follows: i2(t)=α J0(βπ)J1(βπ)cos[wt+π/2].Due to E1(t) first item in formula and Section 3 produce
Raw signal is smaller to be ignored, therefore i1(t) and i2(t) the size same direction is on the contrary, the signal that therefore detector detects is 0.
Work as E1(t) when the signal frequency difference of three generations in formula, disharmonious filtering processing can be carried out, is made in E1(t) in formula
Three fronts are respectively multiplied by coefficient 0,0.5,1, then light field becomes:
E1(t)=0.5J0(βπ)cos(wct)+J1(βπ)cos[(wc+w)t+π/2]
The difference frequency signal of generation are as follows: i2(t)=0.5 α J0(βπ)J1(βπ)cos[wt+π/2]。
Similarly, if handled by disharmonious filtering, make E1(t) three in formula fronts are respectively multiplied by coefficient 1,0.5,0,
So light field becomes:
E1(t)=J1(βπ)cos[(wc-w)t+π/2]+0.5J0(βπ)cos(wct)
The difference frequency signal of generation are as follows: i1(t)=0.5 α J0(βπ)J1(βπ)cos[wt-π/2]。
The embodiment of the present invention controls electro-optical transducer Fa-Po cavity by the voltage of square-wave signal and carries out disharmonious filtering processing, can be with
Realize the switching between 0,0.5,1 and 1,0.5,0, then the electric signal exported is in i1(t) and i2(t) switch between, in handoff procedure
In will generate π mutation, that is, carried out first encoding.
When the frequency of electric signal is less than Free Spectral Range, the half of the frequency signal frequency of electric signal in full width at half maximum
Mistuning effects are relatively good when nearby.It cannot be guaranteed that filtering another sideband if too small, it is too big if carrier wave filtered signal change
It is small.Due to the periodicity of Fa-Po cavity transmission spectrum, in full width at half maximum, (absorption band height maximum height is one to the frequency of electric signal
The overall with of bands of a spectrum when half) half add Free Spectral Range integral multiple when phase code effect can also occur.Therefore should
System can generate a series of encoded signal of discrete frequencies (0.5* full width at half maximum+n* Free Spectral Range), phase code
Frequency is determined by square wave control signal, can arrive 1MHz, and the frequency of electric signal can be 0.5* full width at half maximum+n* free spectrum model
It encloses.The response time of electro-optical transducer Fa-Po cavity in ns magnitude, can complete π phase shift while electric signal is mutated.
The embodiment of the invention also provides a kind of phase-coded signal generating means based on electric light Fa-Po cavity, such as Fig. 2 institute
Show, comprising:
Phase-modulator 210, for electric signal to be carried out double sideband modulation by modulation carrier wave；
Electro-optical transducer Fa-Po cavity 220, for carrying out detuning filter to the signal after double sideband modulation by square wave control signal
Wave processing, to select carrier wave and upper side band signal to pass through, or selection carrier wave and lower sideband signal pass through；
Detector 230, for by the carrier wave and upper side band signal that detect or the carrier wave and lower sideband signal into
Row photoelectric conversion obtains phase-coded signal.
Further, as optional, as shown in figure 3, can also include:
Mono-colour laser 310, for generating the modulation carrier wave.
As optional, electro-optical transducer Fa-Po cavity 220, specifically for passing through electricity of the square wave control signal by square-wave signal
The mobile signal to after double sideband modulation of the filter function of voltage-controlled electro-optical transducer Fa-Po cavity processed carries out disharmonious filtering processing, with selection
Carrier wave and upper side band signal pass through, or selection carrier wave and lower sideband signal pass through.
Detector 230 detects the carrier wave and disharmonious filtering treated the difference of upper side band signal specifically for detector
Difference frequency signal progress photoelectric conversion is obtained phase-coded signal by frequency signal；Or, being specifically used for detecting the carrier wave and lose
Difference frequency signal progress photoelectric conversion is obtained phase code letter by the difference frequency signal of the lower sideband signal after humorous filtering processing
Number.
Device of the present invention can also include: control processing circuit 320, for generating the square wave control signal,
As optional, further subsequent processing can also be carried out to the phase-coded signal that detector 230 obtains.
As shown in figure 3, mono-colour laser 310 exports in the embodiment of the present invention optical signal and electric signal pass through phase-modulation
Device 210 carries out the optical signal exported after double sideband modulation and is sent into electro-optical transducer Fa-Po cavity 220, and electro-optical transducer Fa-Po cavity 220 passes through
The square wave control signal that control processing circuit 320 generates exports after carrying out disharmonious filtering processing to the signal after double sideband modulation
Optical signal is sent into detector 230, and 230 detector of detector detects the carrier wave and disharmonious filtering treated upper side band signal
Difference frequency signal progress photoelectric conversion is obtained phase code electric signal feeding control processing circuit 320 and carried out by difference frequency signal
Subsequent processing.
As shown in figure 4, the structure of electro-optical transducer Fa-Po cavity 220 can described in the frequency measuring equipment of the microwave signal
To include: being used for the input optical fibre 410 of optical signal input waveguide 430 and being used for optical signal output wave for containment portion setting
430 output optical fibre 420 is led, inside cavity setting is used to limit the waveguide 430 in lightray propagation direction, for applying to waveguide
Added electric field is to change lower electrode 440, the top electrode 450 for ground connection and the cavity base material niobic acid of 430 refractive index of waveguide
Lithium 460, the waveguide 430 are extended transversely through in inside cavity, and the left chamber wall and right chamber wall of the cavity are provided with for making light
The signal coupling of roundtrip to constitute the high-reflecting film 470 of Fa-Po cavity, between the input optical fibre 410 and waveguide 430 in waveguide
It is fixed that coupling regime between conjunction region and output optical fibre 420 and waveguide 430 is all made of curing agent 480.
Present embodiment provides a kind of generation method of phase-coded signal and device passes through electro-optical transducer method amber
Chamber carries out quickly selection switching to sideband signals, quickly to generate phase-coded signal, and the encoded signal coding generated
Rate is fast, since method and apparatus structure of the present invention is simple, therefore reduces the cost for generating phase-coded signal.Together
When, the phase-coded signal that the embodiment of the present invention generates can produce up to 1MHz code rate, and carrier frequency can be
It is adjustable in big section.In addition, the operating voltage due to the present apparatus is less than 10V, therefore effectively reduce the energy consumption.
The preferable specific embodiment of the present invention, but scope of protection of the present invention is not limited thereto, it is any to be familiar with this skill
The technical staff in art field is in the technical scope that the embodiment of the present invention discloses, and any changes or substitutions that can be easily thought of, should all contain
Lid is within protection scope of the present invention.Therefore, protection scope of the present invention should be subject to the protection scope in claims.
Claims (2)
1. a kind of phase-coded signal generating means based on electric light Fa-Po cavity characterized by comprising
Phase-modulator, for electric signal to be carried out double sideband modulation by modulation carrier wave；
Electro-optical transducer Fa-Po cavity, for carrying out disharmonious filtering processing to the signal after double sideband modulation by square wave control signal,
To select carrier wave and upper side band signal to pass through, or selection carrier wave and lower sideband signal pass through；
Detector, for the carrier wave and upper side band signal that detect or the carrier wave and lower sideband signal to be carried out photoelectricity
It is converted to phase-coded signal；
Further include: mono-colour laser, for generating the modulation carrier wave；
The electro-optical transducer Fa-Po cavity, specifically for controlling electro-optical transducer by the voltage of square-wave signal by square wave control signal
The mobile signal to after double sideband modulation of the filter function of Fa-Po cavity carries out disharmonious filtering processing, to select carrier wave and top to take a message
Number pass through, or selection carrier wave and lower sideband signal pass through；
The detector detects the carrier wave and disharmonious filtering treated the difference frequency signal of upper side band signal for detector,
Difference frequency signal progress photoelectric conversion is obtained into phase-coded signal；Or,
The difference frequency signal of treated for detecting the carrier wave and disharmonious filtering lower sideband signal, the difference frequency signal is carried out
Photoelectric conversion obtains phase-coded signal；
Further include: control processing circuit, for generating the square wave control signal；
Apply square wave control signal on electro-optical transducer Fa-Po cavity, which passes through the low and high level V1 and V2 of square wave
It realizes, one of sideband is able to suppress by the way that the signal after double sideband modulation is carried out disharmonious filtering processing, to generate
Electric signal, therefore disharmonious filtering processing is realized in the filter function position by changing electro-optical transducer Fa-Po cavity, when square wave controls information
When control voltage is V1, the upper side band signal that the signal after double sideband modulation generates is suppressed, so that carrier wave and lower sideband signal
Pass through；When square wave control information control voltage is V2, the lower sideband signal that the signal after double sideband modulation generates is suppressed, and is made
It obtains carrier wave and upper side band signal passes through, since the phase of carrier wave and upper side band signal or carrier wave and lower sideband signal just differs
π, the signal that detector detects just will appear π phase shift；
As electric signal v (t)=V cos (wt), the angular frequency for modulating carrier wave is wcWhen, double sideband modulation is carried out through ovennodulation carrier wave
Light field afterwards are as follows:
E1(t)=J1(βπ)cos[(wc-w)t+π/2]+J0(βπ)cos(wct)+J1(βπ)cos[(wc+w)t+π/2]；
Wherein β=V/Vπ, VπFor the half-wave voltage of phase-modulator, J is Bessel function, the difference frequency of preceding two generations in above formula
Signal are as follows: i1(t)=α J0(βπ)J1(β π) cos [wt- pi/2], α indicates the responsiveness of detector in formula；The difference of two generations afterwards
Frequency signal are as follows: i2(t)=α J0(βπ)J1(βπ)cos[wt+π/2]；Due to E1(t) first item in formula and Section 3 generate
Signal is smaller to be ignored, therefore i1(t) and i2(t) the size same direction is on the contrary, the signal that therefore detector detects is 0；Work as E1
(t) when the signal frequency difference of three generations in formula, disharmonious filtering processing can be carried out, is made in E1(t) three in formula
Respectively multiplied by coefficient 0,0.5,1 before, light field becomes:
E1(t)=0.5J0(βπ)cos(wct)+J1(βπ)cos[(wc+w)t+π/2]；
The difference frequency signal of generation are as follows: i2(t)=0.5 α J0(βπ)J1(βπ)cos[wt+π/2]；
It is handled by disharmonious filtering, makes E1(t) respectively multiplied by coefficient 1,0.5,0, light field becomes three fronts in formula:
E1(t)=J1(βπ)cos[(wc-w)t+π/2]+0.5J0(βπ)cos(wct)；
The difference frequency signal of generation are as follows: i1(t)=0.5 α J0(βπ)J1(βπ)cos[wt-π/2]；
Electro-optical transducer Fa-Po cavity is controlled by the voltage of square-wave signal and carries out disharmonious filtering processing, realizes 0,0.5,1 and 1,0.5,0
Between switching, then the electric signal exported is in i1(t) and i2(t) switch between, will be generated in handoff procedure π mutation, i.e., into
First encoding is gone.
2. generating means according to claim 1, which is characterized in that the structure of the electro-optical transducer Fa-Po cavity includes: chamber
What is be arranged outside body being used for the input optical fibre of optical signal input waveguide and being used for the output optical fibre of optical signal output waveguide, chamber
The waveguide for limiting lightray propagation direction of internal portion's setting, for applying electric field to waveguide to change waveguide index
Lower electrode, the top electrode for ground connection and cavity base material lithium niobate, the waveguide is extended transversely through in inside cavity, described
The left chamber wall and right chamber wall of cavity be provided with for make optical signal in waveguide roundtrip to constitute the high-reflecting film of Fa-Po cavity,
The coupling regime between coupling regime and output optical fibre and waveguide between the input optical fibre and waveguide is all made of curing agent
It is fixed.
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