CN109286114A - Millimeter wave optical-electronic oscillator and its frequency-stabilizing method based on regenerative frequency dividing - Google Patents
Millimeter wave optical-electronic oscillator and its frequency-stabilizing method based on regenerative frequency dividing Download PDFInfo
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- CN109286114A CN109286114A CN201811131984.1A CN201811131984A CN109286114A CN 109286114 A CN109286114 A CN 109286114A CN 201811131984 A CN201811131984 A CN 201811131984A CN 109286114 A CN109286114 A CN 109286114A
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- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
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Abstract
The present invention provides a kind of millimeter wave optical-electronic oscillators and its frequency-stabilizing method based on regenerative frequency dividing, and optical-electronic oscillator includes: laser, electro-optic intensity modulator, optical fiber energy storage link, photodetector, electric coupler, regenerative frequency unit, External Reference phase locking unit, frequency multiplier, outside source and external reference signal source.Using the present invention, millimeter-wave signal can be divided into the lower signal of frequency by regenerative frequency unit, since the lower signal of frequency can be by the processing of each electric elements, control, so the external reference signal locking phase of the lower signal of frequency and high stable, then pass through frequency multiplier for the signal frequency multiplication after locking phase, and the signal after frequency multiplication is fed back into electro-optic intensity modulator, the millimeter-wave signal of frequency stabilization available in this way.
Description
Technical field
The present invention relates to microwave photon technology fields, shake more particularly to a kind of millimeter wave photoelectricity based on regenerative frequency dividing
Swing device and its frequency-stabilizing method.
Background technique
Optical-electronic oscillator using high-quality optical resonator realize Power Flow, Q value (quality factor), working frequency range,
Electromagnetism interference etc. has unique advantage, can produce the microwave signal from several hundred MHz to gigahertz frequency ranges up to a hundred, and
And the phase noise of signal is unrelated with working frequency range.As it can be seen that optical-electronic oscillator is a kind of microwave system especially millimeter-wave systems
Ideal signal generation apparatus.The optical-electronic oscillator of high quality is the important component of contemporary electronic systems, observing and controlling,
The fields such as radar, communication, navigation, electronic countermeasure, astronomy and Experiments of Modern Physics suffer from very extensive application prospect.With
The fast development of electronic system technology and wireless communication technique, the signal tool that electronic and communication system needs optical-electronic oscillator to generate
There is higher frequency stability.
The typical structure of existing optical-electronic oscillator is as shown in Figure 1, specifically include that laser, modulator, optical fiber energy storage chain
Road, photodetector, microwave amplifier and bandpass filter, wherein modulator, optical fiber energy storage link, photodetector, microwave
Amplifier and bandpass filter are sequentially connected, forming circuit, and the light input end of the output end of laser and modulator connects.Swash
Light device output optical carrier successively through ovennodulation, demodulation, amplification and filtering etc. processing after, available millimeter-wave signal.
However, inventor has found in the implementation of the present invention, at least there are the following problems for the prior art: by existing
Optical-electronic oscillator generate millimeter wave when, there are frequency limits for the signal being capable of handling due to certain electric elements, for example, existing
The device relatively narrow, and that millimeter wave is not divided of millimeter wave electronically controlled phase shifter phase shift range, lead to existing millimeter
Glistening light of waves electrical oscillator is difficult to optimize a millimeter frequency stability for glistening light of waves optical-electronic oscillator with phaselocked loop.
Summary of the invention
The embodiment of the present invention is designed to provide a kind of millimeter wave optical-electronic oscillator based on regenerative frequency dividing and its steady
Frequency method, to generate the millimeter-wave signal of frequency stabilization.Specific technical solution is as follows:
In a first aspect, providing a kind of millimeter wave optical-electronic oscillator based on regenerative frequency dividing, the optical-electronic oscillator packet
It includes: laser, electro-optic intensity modulator, optical fiber energy storage link, photodetector, outside source, electric coupler, regenerative point
Frequency unit, External Reference phase locking unit and frequency multiplier；
The output end of the laser is connect with the light input end of the electro-optic intensity modulator, and the laser is for defeated
Optical carrier out；
The output end of the electro-optic intensity modulator is connect with the input terminal of the optical fiber energy storage link, the electro-optic intensity
Modulator generates modulated optical signal, the modulated optical signal includes for being modulated to the optical carrier
Plain edge band signal and optical carrier；
The output end of the optical fiber energy storage link is connect with the input terminal of the photodetector, the optical fiber energy storage link
It is used for transmission the modulated optical signal, and is used for energy storage；
The output end of the photodetector is connect with the first input end of the electric coupler, and the photodetector is used
In demodulating modulated signal from the modulated optical signal received, and export electric signal；
The output end of the electric coupler is connect with the input terminal of the regenerative frequency unit, and the of the electric coupler
The connection of the output end of two input terminals and outside source, the electric coupler be used for the signal that exports the photodetector and
The microwave signal of the outside source output is input to the regenerative frequency unit；
The output end of the regenerative frequency unit is connect with the input terminal of the External Reference phase locking unit, the regenerative
The electric signal that frequency unit is used to export the photodetector divides；
The output end of the External Reference phase locking unit is connect with the input terminal of the frequency multiplier, the External Reference phase locking unit
For the phase using the signal after external reference signal locking frequency dividing；
The output end of the frequency multiplier is connect with the microwave modulated signal input terminal of the electro-optic intensity modulator, and described times
Frequency device is used for frequency multiplication, so that the frequency retrieval of the signal after frequency dividing is the frequency before frequency dividing.
Optionally, the regenerative frequency unit includes frequency mixer, bandpass filter, microwave amplifier and the first phase shift
Device, wherein the first input end of the frequency mixer is connect with the output end of the electric coupler, the first input of the frequency mixer
End is the input terminal of the regenerative frequency unit, and the output end of first phase shifter is the defeated of the regenerative frequency unit
Outlet；
The output end of the frequency mixer is connect with the input terminal of the bandpass filter, the second input terminal of the frequency mixer
It is connect with the output end of first phase shifter, the frequency mixer is used for the signal and described first for exporting the electric coupler
The signal of phase shifter output is mixed；
The output end of the bandpass filter is connect with the input terminal of the microwave amplifier, and the bandpass filter is used for
Signal after screening mixing, and filter out supermode noise；
The output end of the microwave amplifier is connect with the input terminal of first phase shifter, and the microwave amplifier is used for
Amplify received signal, first phase shifter is used to adjust the phase of received signal.
Optionally, the number of the regenerative frequency unit is one or more, multiple regenerative frequency unit series connection
Connection.
Optionally, the optical-electronic oscillator further includes the frequency divider in addition to the regenerative frequency unit, the frequency dividing
Device is connected on the output end of the regenerative frequency unit.
Optionally, the microwave amplifier is reactatron.
Optionally, the External Reference phase locking unit includes: the second phase shifter, phase discriminator and proportional integral differential PID unit；
The output end of second phase shifter is the output end of the External Reference phase locking unit, the of second phase shifter
One input terminal is the input terminal of the External Reference phase locking unit；
The output end of second phase shifter is connect with the second input terminal of the phase discriminator, and second phase shifter is used for
The phase of received signal is adjusted, to compensate the variation of the Resonant Intake System of the optical-electronic oscillator；
The output end of the phase discriminator is connect with the input terminal of the PID unit, the input terminal of the PID unit with it is described
Second input terminal of the second phase shifter connects, the signal that the phase discriminator is used to export second phase shifter with from it is described outside
Portion's derived reference signal received signal carries out phase demodulation, and it is micro- that the signal that the PID unit is used to obtain phase demodulation carries out proportional integration
Divide processing.
Optionally, second phase shifter is electronically controlled phase shifter.
Second aspect provides a kind of millimeter wave optical-electronic oscillator frequency-stabilizing method based on regenerative frequency dividing, the method
Include:
Generate optical carrier；
The optical carrier is modulated, modulated optical signal is generated；
Transmit the modulated optical signal；
Modulated signal is demodulated from the modulated optical signal after transmission, and obtains electric signal；
Scaling down processing is carried out to the electric signal；
Locking phase is carried out to the signal after frequency dividing using external reference signal；
Process of frequency multiplication carried out to the signal after locking phase, millimeter-wave signal after obtaining frequency multiplication, and by the millimeter-wave signal
It is modulated in the optical carrier.
Optionally, described the step of scaling down processing is carried out to the electric signal, comprising:
Frequency mixing processing is carried out to the electric signal and the feedback signal received；
Signal after Frequency mixing processing is filtered；
Processing is amplified to filtered signal；
Phase shift processing is carried out to amplified signal, obtains the feedback signal.
Optionally, described the step of locking phase is carried out to the signal after frequency dividing using external reference signal, comprising:
Phase demodulation processing is carried out to the signal after frequency dividing using External Reference signal；
Proportional integral differential processing is carried out to the signal that phase demodulation obtains；
The signal handled according to proportional integral differential carries out phase shift processing to the signal after frequency dividing, described in compensation
The variation of the Resonant Intake System of optical-electronic oscillator.
A kind of millimeter wave optical-electronic oscillator based on regenerative frequency dividing provided in an embodiment of the present invention, optical-electronic oscillator packet
It includes: laser, electro-optic intensity modulator, optical fiber energy storage link, photodetector, outside source, electric coupler, regenerative point
Frequency unit, External Reference phase locking unit and frequency multiplier；The output end of laser and the light input end of electro-optic intensity modulator connect, and swash
Light device is for exporting optical carrier；The output end of electro-optic intensity modulator is connect with the input terminal of optical fiber energy storage link, electric light
Intensity modulator generates modulated optical signal, modulated optical signal includes plain edge for being modulated to optical carrier
Band signal and optical carrier；The output end of optical fiber energy storage link and the input terminal of photodetector connect, optical fiber energy storage link
It is used for transmission modulated optical signal, and is used for energy storage；The output end of photodetector and the first input end of electric coupler connect
It connects, photodetector exports electric signal for demodulating modulated signal from the modulated optical signal received；It is electrically coupled
The output end of device is connect with the input terminal of regenerative frequency unit, the second input terminal of electric coupler and the output of outside source
End connection, electric coupler are used to the microwave signal for signal and the outside source output that photodetector exports being input to regeneration
Formula frequency unit；The output end of regenerative frequency unit is connect with the input terminal of External Reference phase locking unit, regenerative frequency unit
For being divided to the electric signal that photodetector exports；The output end of External Reference phase locking unit and the input terminal of frequency multiplier connect
It connects, External Reference phase locking unit is used for the phase using the signal after external reference signal locking frequency dividing；The output end of frequency multiplier with
The microwave modulated signal input terminal of electro-optic intensity modulator connects, and frequency multiplier is used for frequency multiplication, so that the frequency of the signal after frequency dividing
Frequency before reverting to frequency dividing.
Using technical solution provided in an embodiment of the present invention, millimeter-wave signal can be divided by regenerative frequency unit
At the lower signal of frequency, since the lower signal of frequency can be by the processing of each electric elements, control, so the lower letter of frequency
It number can and will be after frequency multiplication then by frequency multiplier by the signal frequency multiplication after locking phase with the external reference signal locking phase of high stable
Signal feed back to electro-optic intensity modulator, the millimeter-wave signal of frequency stabilization available in this way.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described.
Fig. 1 is a kind of structural schematic diagram of existing optical-electronic oscillator provided in an embodiment of the present invention；
Fig. 2 is a kind of structural representation of millimeter wave optical-electronic oscillator based on regenerative frequency dividing provided in an embodiment of the present invention
Figure；
Fig. 3 is a kind of structural representation of millimeter wave optical-electronic oscillator based on regenerative frequency dividing provided in an embodiment of the present invention
Figure；
Fig. 4 is a kind of millimeter wave optical-electronic oscillator frequency-stabilizing method based on regenerative frequency dividing provided in an embodiment of the present invention
Flow chart；
Fig. 5 is the method flow diagram of regenerative provided in an embodiment of the present invention frequency dividing；
Fig. 6 is the method flow diagram of External Reference locking phase provided in an embodiment of the present invention；
Fig. 7 is the 40GHZ that the millimeter wave optical-electronic oscillator provided in an embodiment of the present invention based on regenerative frequency dividing generates
Millimeter-wave signal spectrogram；
Fig. 8 is the millimeter-wave signal spectrogram for the 40GHZ that existing optical-electronic oscillator generates；
Fig. 9 is the corresponding Alan's variogram of Fig. 7 and Fig. 8.
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 is described.
A kind of millimeter wave optical-electronic oscillator and its frequency-stabilizing method based on regenerative frequency dividing provided in an embodiment of the present invention, leads to
It crosses regenerative frequency unit and millimeter-wave signal is divided into the lower signal of frequency, since the lower signal of frequency can be by each electricity
The processing of device element, control, so then the lower signal of frequency can pass through frequency multiplication with the external reference signal locking phase of high stable
Device feeds back to electro-optic intensity modulator by the signal frequency multiplication after locking phase, and by the signal after frequency multiplication, and frequency available in this way is steady
Fixed millimeter-wave signal.
First below to a kind of millimeter wave optical-electronic oscillator progress based on regenerative frequency dividing provided in an embodiment of the present invention
It introduces.
As shown in Fig. 2, Fig. 2 is a kind of millimeter wave optoelectronic oscillation based on regenerative frequency dividing provided in an embodiment of the present invention
Device, the millimeter wave optical-electronic oscillator of external reference signal source 14 include: laser 1, electro-optic intensity modulator 2, optical fiber energy storage chain
Road 3, photodetector 4, outside source 5, electric coupler 6, regenerative frequency unit 7, External Reference phase locking unit 8 and frequency multiplier
9。
Wherein, the output end of laser 1 is connect with the light input end of electro-optic intensity modulator 2, and laser 1 is used for output light
Carrier signal；
The output end of electro-optic intensity modulator 2 is connect with the input terminal of optical fiber energy storage link 3, and electro-optic intensity modulator 2 is used
It is modulated in optical carrier, generates modulated optical signal, modulated optical signal includes that plain edge band signal and light carry
Wave signal；
The output end of optical fiber energy storage link 3 is connect with the input terminal of photodetector 4, and optical fiber energy storage link 3 is used for transmission
Modulated optical signal, and it is used for energy storage；
The output end of photodetector 4 is connect with the first input end of electric coupler 6, and photodetector 4 is used for from reception
To modulated optical signal in demodulate modulated signal, and export electric signal；
The output end of electric coupler 6 is connect with the input terminal of regenerative frequency unit 7, the second input terminal of electric coupler 6
For being connect with the output end of outside source 5, signal and external signal that electric coupler 6 is used to export photodetector 4
The microwave signal that source 5 exports is input to regenerative frequency unit 7；Wherein, for outside source 5 for exporting external signal, this is outer
Portion's signal is for triggering the normal work of regenerative frequency unit 7, after regenerative frequency unit 7 works normally, outside source 5
It can disconnect.For example, the power threshold that regenerative frequency unit 7 works normally is -14dBm, needed when just starting to work outer
Portion's signal source 5 inputs microwave signal, and when its normal work, outside source 5 can be disconnected.
In specifically used optical-electronic oscillator provided in an embodiment of the present invention, the position of outside source 5 can be arranged
Other positions in optical-electronic oscillator electricity ring.For example, being arranged the input terminal of outside source 5 in regenerative frequency unit 7
Output end, alternatively, the input terminal of outside source 5 to be arranged in the output end of External Reference phase locking unit 8, setting is external in this way
The position of signal source 5 is all possible.When the change in location of outside source 5, the output power needs of outside source 5 are set
It is set to the frequency of electric signal in the corresponding optical-electronic oscillator electricity ring in the position.
The output end of regenerative frequency unit 7 is connect with the input terminal of External Reference phase locking unit 8, regenerative frequency unit 7
Signal for exporting photodetector divides；
The output end of External Reference phase locking unit 8 is connect with the input terminal of frequency multiplier 9,14 External Reference of external reference signal source lock
Phase element 8 is used for the phase using the signal after external reference signal locking frequency dividing；Wherein, external reference signal source 14 is for defeated
The external reference signal of frequency stabilization out.
The output end of frequency multiplier 9 is connect with the microwave modulated signal input terminal of electro-optic intensity modulator 2, and frequency multiplier 9 is used for
Frequency multiplication, so that the frequency retrieval of the signal after frequency dividing is the frequency before frequency dividing, to obtain millimeter-wave signal；Wherein, frequency multiplier 9
Times frequency ratio it is consistent with the frequency dividing ratio of regenerative frequency unit 7 so that the frequency of the electric signal after frequency multiplication and photodetector 4 are defeated
The frequency of electric signal out is consistent, to guarantee that oscillator constitutes closed loop oscillation.
Millimeter wave optical-electronic oscillator provided in an embodiment of the present invention based on regenerative frequency dividing, can be divided by regenerative
Millimeter-wave signal is divided into the lower signal of frequency by unit, due to the lower signal of frequency can by each electric elements processing,
Control, so the lower signal of frequency can be with the external reference signal locking phase of high stable, it then will be after locking phase by frequency multiplier
Signal frequency multiplication, and the signal after frequency multiplication is fed back into electro-optic intensity modulator.It is handled by the locking phase of External Reference phase locking unit
So that signal is more stable.And existing External Reference phase locking unit can not carry out locking phase to the higher millimeter-wave signal of frequency, lead to
Increase regenerative frequency unit is crossed, scaling down processing is carried out to the higher millimeter-wave signal of frequency in advance, so that External Reference locking phase list
Member can carry out locking phase processing, and then the millimeter wave optical-electronic oscillator can be handled the higher millimeter-wave signal of frequency.
Therefore, it can use technical solution provided in an embodiment of the present invention and obtain the millimeter-wave signal of frequency stabilization.
In practical application, when the optical carrier of laser output meets the following conditions: reaching photodetector
Optical power size can be such that photodetector responds；The millimeter that the frequency and needs of the external signal of outside source output generate
The frequency of wave signal is same or similar；The power of external signal reaches the operation threshold of regenerative frequency unit and external reference
The frequency of the external reference signal of signal source output is same or similar with the frequency of the signal after frequency dividing.Utilize the embodiment of the present invention
The millimeter wave of high frequency stability, low phase noise can be generated in the millimeter wave optical-electronic oscillator based on regenerative frequency dividing provided
Signal.For example, it is desired to which the wavelength of the optical carrier of laser output can be set to when generating the millimeter wave of 40GHZ
1550nm, power 18dbm；The frequency of external signal is 40GHz, power 6dbm；The frequency of signal after frequency dividing is
When 10GHz, the frequency of external reference signal is 10GHz, power 3dBm.
The a branch of continuous light of laser emitting, after the modulation of Mach-Zehnder electro-optic intensity modulator, electro-optic intensity modulator
Output end optical power and the relationship of input radio frequency signal are as follows:
P (t)=(α Po/2){1-ηsinπ[Vin(t)/Vπ+VB/Vπ]} (1)
Wherein, α is the insertion loss of electro-optic intensity modulator, VπIt is the half-wave voltage of electro-optic intensity modulator, VBIt is electric light
The bias voltage of intensity modulator, VπIt is the half-wave voltage of electro-optic intensity modulator, PoIt is the light function for inputting electro-optic intensity modulator
Rate, η are used to characterize extinction ratio (1+ η)/(the 1- η) of electro-optic intensity modulator.VinIt (t) is the radio frequency of input electro-optic intensity modulator
The signal that modulated signal, i.e. optical-electronic oscillator stable oscillation stationary vibration generate, can be expressed as Vin(t)=V0Sin (wt+b), wherein V0
It is the amplitude of input radio frequency signal, ω is the angular frequency of its oscillation, and b is its initial phase.
The optical signal of electro-optic intensity modulator output input photodetector after long optical fibers are delayed energy storage carries out photoelectricity and turns
It changes, the radiofrequency signal V exported after microwave amplifier is handledout(t) are as follows:
Vout(t)=ρ P (t) RGA=Vph{1-ηsinπ[V0sin(2πfmt)/Vπ+VB/Vπ]}(2)
Wherein, ρ is the responsiveness of photodetector, and R is the load impedance of photodetector, GAIt is the voltage increasing of amplifier
Benefit, VphIt is photovoltage, is defined as follows:
Vph=(α Poρ/2)RGA=IphRGA (3)
Wherein, IphIt is output light electric current, and Iph≡αPoρ/2。
The microwave modulated signal for the radio frequency signal feedback telegram in reply light intensity modulator that optical-electronic oscillator needs to state formula (2)
Input port forms the optoelectronic oscillation loop an of positive feedback.
According to formula (2) optical-electronic oscillator system open loop small-signal gain are as follows:
Small-signal gain be greater than 1 be oscillator starting of oscillation necessary condition.
Bessel equation will be expanded on the right side of equation (2), the radio frequency letter of the photodetector that can visually see output
Frequency content in number, is unfolded as follows:
It include many harmonic components from can be seen that in formula (5) in photodetector output radiofrequency signal.
It optionally, in actual use, can be based on Fig. 2's in order to compensate for the decaying of signal and reduction signal noise
On the basis of optical-electronic oscillator, increase microwave amplifier and bandpass filter, optical-electronic oscillator as shown in Figure 3, with addition of
Microwave amplifier 18 and bandpass filter 19.The number of increased microwave amplifier and bandpass filter can be one or more
It is a, the position of increased microwave amplifier and bandpass filter can according to millimeter-wave signal accuracy requirement and signal decline
Subtract the factors such as degree to be specifically arranged, the present invention is not construed as limiting.
Optionally, as a kind of embodiment of the embodiment of the present invention, regenerative frequency unit 7 includes frequency mixer 10, band
Bandpass filter 11, microwave amplifier 12 and the first phase shifter 13, wherein the first input end of frequency mixer 10 and electric coupler 6
Output end connection, the first input end of frequency mixer 10 are the input terminal of regenerative frequency unit 7, the output end of the first phase shifter 13
For the output end of regenerative frequency unit 7；
The output end of frequency mixer 10 is connect with the input terminal of bandpass filter 11, the second input terminal of frequency mixer 10 and first
The output end of phase shifter 13 connects, and frequency mixer 10 is used for the signal that electric coupler 6 exports and the letter that the first phase shifter 13 exports
It number is mixed；
The output end of bandpass filter 11 is connect with the input terminal of microwave amplifier 12, and bandpass filter 11 is mixed for screening
Signal after frequency, and filter out supermode noise；
The output end of microwave amplifier 12 is connect with the input terminal of the first phase shifter 13, and microwave amplifier 12 is for amplifying it
The signal received, the first phase shifter 13 are used to adjust the phase of received signal, so that regenerative frequency unit 7 meets
Two conditions worked normally: the loop gain of regenerative frequency unit 7 is greater than 1；The phase shift of the loop is 2k π, and k is integer.
In scheme provided in an embodiment of the present invention, regenerative frequency unit 7 it is simple and practical in structure.Angular frequency is ωin's
The input signal (signal of the first phase shifter 13 feedback) of input signal (signal that electric coupler 6 inputs) and loop feedback is common
Input as frequency mixer 10；The output of frequency mixer 10 includes two kinds of frequency contents, such as ωin/ 2 and 3 ωin/2；Regenerative frequency dividing
Bandpass filter 11 in unit 7 can be with rejection frequency for 3 ωin/ 2 frequency content, the at this moment output of regenerative frequency unit 7
The frequency of signal is the half of the frequency of input signal, i.e., 2 times of frequency dividings may be implemented in regenerative frequency unit 7.In addition, frequency mixer
Add a N (N is positive integer) times frequency multiplier in the output end of bandpass filter 11, regenerative frequency unit can be made to realize N+1
Frequency dividing.
Optionally, as a kind of embodiment of the embodiment of the present invention, the number of regenerative frequency unit 7 is 1 or more
A, multiple regenerative frequency units 7 are connected in series.
It is single that input regenerative frequency dividing in the frequency range and practical application of signal can be handled according to External Reference phase locking unit
The signal frequency of member, determines the number of regenerative frequency unit, thereby may be ensured that the stable work of External Reference phase locking unit.
Optionally, in practical application, the millimeter wave optoelectronic oscillation provided in an embodiment of the present invention based on regenerative frequency dividing
Device can include simultaneously regenerative frequency unit and the frequency divider in addition to regenerative frequency unit, these frequency dividers refer to existing
Frequency divider in technology.The frequency for the signal being capable of handling due to frequency divider in the prior art can than regenerative frequency unit
The frequency of the signal of processing is low, so frequency divider in the prior art is connected on the output end of regenerative frequency unit, thus right
The signal of lower frequency continues to divide.
Optionally, as a kind of embodiment of the embodiment of the present invention, microwave amplifier 12 is reactatron.
In scheme provided in an embodiment of the present invention, microwave amplifier 12 can be low-noise amplifier.Low noise is selected to put
Big device can make the millimeter-wave signal of low phase noise, low spurious.
Optionally, as a kind of embodiment of the embodiment of the present invention, External Reference phase locking unit 8 includes: External Reference signal
Source 14, phase discriminator 15, proportional integral differential PID unit 16 and the second phase shifter 17PID unit 16；Wherein, phase discriminator is available mixed
Frequency device replaces.
The output end of second phase shifter 17 is the output end of External Reference phase locking unit 8, the first input of the second phase shifter 17
End is the input terminal of External Reference phase locking unit 8；
The output end of second phase shifter 17 is connect with the second input terminal of phase discriminator 15, and the second phase shifter 17 is for adjusting it
The phase of the signal received, to compensate the variation of the Resonant Intake System of optical-electronic oscillator；Due to the Resonant Intake System of optical-electronic oscillator
Depending on fiber lengths, and optical fiber is highly prone to the influence such as environment temperature, vibration, to cause the change of oscillation mode, causes
The frequency shifts of optical-electronic oscillator output signal or jump so that the frequency stability of optical-electronic oscillator output signal compared with
Difference can compensate the variation of the Resonant Intake System of optical-electronic oscillator by the second phase shifter 17, to stablize optical-electronic oscillator output letter
Number frequency.
The output end of phase discriminator 15 is connect with the input terminal of PID unit 16, the input terminal of PID unit 16 and the second phase shifter
17 the second input terminal connection, phase discriminator 15 is for connecing the signal that the second phase shifter 17 exports with from external reference signal source 14
The signal of receipts carries out phase demodulation, and the signal that PID unit 16 is used to obtain phase demodulation carries out proportional integral differential processing.
Simple and practical in structure, the suitable industrial application of External Reference phase locking unit provided in an embodiment of the present invention.In view of electricity
The frequency for the millimeter-wave signal that control phase shifter is capable of handling has certain range, and the highest frequency of this range may not
Height, therefore, when needing to generate millimeter-wave signal, especially generation frequency higher millimeter-wave signal when, one can be passed through
Or multiple regenerative frequency units are moved by pre- fractional frequency signal scaling down processing, then by the signal input electronically controlled phase shifter after frequency dividing
Phase processor.
Optionally, as a kind of embodiment of the embodiment of the present invention, the second phase shifter 17 is electronically controlled phase shifter.It considers
Manually phase shifter precision is high for the ratio of precision of electronically controlled phase shifter, is believed using the higher millimeter wave of the available precision of electronically controlled phase shifter
Number.In actual use, the first phase shifter 13 selects manual phase shifter that can meet accuracy requirement, certainly, by the first phase shifter
13 are selected as electronically controlled phase shifter can also be with.
Based on the same technical idea, corresponding to the millimeter wave optical-electronic oscillator based on regenerative frequency dividing described in Fig. 2, originally
Invention additionally provides a kind of millimeter wave optical-electronic oscillator frequency-stabilizing method based on regenerative frequency dividing, and this method is as shown in figure 4, include
Following steps:
S401: optical carrier is generated；
S402: being modulated optical carrier, generates modulated optical signal；
S403: modulated optical signal is transmitted；
S404: modulated signal is demodulated from the modulated optical signal after transmission, and obtains electric signal；
S405: scaling down processing is carried out to electric signal；
S406: locking phase is carried out to the signal after frequency dividing using external reference signal；
S407: carrying out process of frequency multiplication to the signal after locking phase, the millimeter-wave signal after obtaining frequency multiplication, and the millimeter wave is believed
It number is modulated in optical carrier.
Millimeter wave optical-electronic oscillator frequency-stabilizing method provided in an embodiment of the present invention based on regenerative frequency dividing, can be by millimeter
Wave signal frequency split is at the lower signal of frequency, since the lower signal of frequency can be by the processing of each electric elements, control, so frequency
The lower signal of rate can with the external reference signal locking phase of high stable, then by frequency multiplier by the signal after locking phase times, this
The millimeter-wave signal of the available frequency stabilization of sample.
Optionally, as a kind of embodiment of the embodiment of the present invention, as shown in figure 5, above-mentioned S405 may include following
Step:
S4051: Frequency mixing processing is carried out to electric signal and the feedback signal received；
S4052: the signal after Frequency mixing processing is filtered；
S4053: processing is amplified to filtered signal；
S4054: phase shift processing is carried out to amplified signal, obtains feedback signal.
In scheme provided in an embodiment of the present invention, the step of by S4051 to S4054, it may be implemented to carry out electric signal
Scaling down processing, the signal that scaling down processing obtains can be by External Reference phase locking unit locking phases.
Optionally, as a kind of embodiment of the embodiment of the present invention, as shown in fig. 6, above-mentioned S406 may include following
Step:
S4061: phase demodulation processing is carried out to the signal after frequency dividing using External Reference signal；
S4062: proportional integral differential processing is carried out to the signal that phase demodulation obtains；
S4063: the signal handled according to proportional integral differential carries out phase shift processing to the signal after frequency dividing, to mend
Repay the variation of the Resonant Intake System of optical-electronic oscillator.
In scheme provided in an embodiment of the present invention, the signal after frequency dividing is carried out by the External Reference signal using high stable
Phase demodulation processing, then by proportional integral differential processing after, the corresponding electricity of signal that is handled further according to proportional integral differential
Pressure value size carries out phase shift processing to the signal after frequency dividing, in this way can be with to compensate the variation of the Resonant Intake System of optical-electronic oscillator
Obtain the millimeter-wave signal of frequency stabilization.
Illustratively, the embodiment of the invention provides a kind of millimeter wave optical-electronic oscillator frequency stabilization sides based on regenerative frequency dividing
Method, applied to the millimeter wave optical-electronic oscillator divided based on regenerative, which may include: laser, electro-optic intensity tune
Device processed, optical fiber energy storage link, photodetector, outside source, electric coupler, regenerative frequency unit, External Reference locking phase list
Member and frequency multiplier.Based on regenerative frequency dividing millimeter wave optical-electronic oscillator frequency-stabilizing method the following steps are included:
Optical-electronic oscillator utilize it includes the devices such as amplifier, bandpass filter in noise start starting of oscillation；；
Laser output light carrier signal；
Electro-optic intensity modulator is modulated optical carrier, generates modulated optical signal；
The modulated optical signal of optical fiber energy storage link transmission, and carry out energy storage；
Photodetector demodulates modulated signal from the modulated optical signal received, and exports electric signal；
Electric coupler is input to again by the electric signal that photodetector exports and from the received microwave signal of outside source
Raw formula frequency unit；
The electric signal that the external signal that regenerative frequency unit is sent using outside source exports photodetector into
Row scaling down processing；
External Reference phase locking unit locks the phase of the signal after frequency dividing using external reference signal；
Frequency multiplier carries out process of frequency multiplication to the signal after locking phase, the millimeter-wave signal after obtaining frequency multiplication, and will be after frequency multiplication
Millimeter-wave signal is modulated in optical carrier.
Fig. 7, Fig. 8, Fig. 9 are the experimental result pictures for generating the millimeter-wave signal of 40GHZ, wherein Fig. 7 shows the present invention
The millimeter-wave signal that the millimeter wave optical-electronic oscillator based on regenerative frequency dividing that embodiment provides generates；Fig. 8 shows existing
Optical-electronic oscillator generate millimeter-wave signal；Fig. 9 shows the Alan of the millimeter-wave signal obtained by both modes
Variance, in Fig. 9 above curve be the corresponding Alan's variance of Fig. 8, in Fig. 9 below curve be the corresponding Alan's variance of Fig. 7.By
Comparison diagram 7 and Fig. 8 are it is found that the frequency of the millimeter-wave signal generated according to the technical solution of the present invention is more stable；It can by Fig. 9
See, as time increases, the corresponding Alan's variance of Fig. 7 is gradually reduced, and the corresponding Alan's variance of Fig. 8 gradually increases, and Fig. 7 pairs
Small 2 to 6 orders of magnitude of the corresponding Alan's variance of Alan's variance ratio Fig. 8 answered, i.e., it is provided in an embodiment of the present invention to be based on regenerative
The stability for the millimeter-wave signal that the millimeter wave optical-electronic oscillator of frequency dividing generates is than the millimeter wave letter that existing optoelectronic oscillation generates
Number stability improve 2 to 6 orders of magnitude.
It should be noted that, in this document, relational terms such as first and second and the like are used merely to a reality
Body or operation are distinguished with another entity or operation, are deposited without necessarily requiring or implying between these entities or operation
In any actual relationship or order or sequence.Moreover, the terms "include", "comprise" or its any other variant are intended to
Non-exclusive inclusion, so that the process, method, article or equipment including a series of elements is not only wanted including those
Element, but also including other elements that are not explicitly listed, or further include for this process, method, article or equipment
Intrinsic element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that
There is also other identical elements in process, method, article or equipment including the element.
Each embodiment in this specification is all made of relevant mode and describes, same and similar portion between each embodiment
Dividing may refer to each other, and each embodiment focuses on the differences from other embodiments.Especially for based on again
For the millimeter wave optical-electronic oscillator frequency-stabilizing method embodiment of raw formula frequency dividing, since it is substantially similar to based on regenerative frequency dividing
Millimeter wave optical-electronic oscillator embodiment, so being described relatively simple, related place is referring to the part explanation of embodiment of the method
It can.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the scope of the present invention.It is all
Any modification, equivalent replacement, improvement and so within the spirit and principles in the present invention, are all contained in protection scope of the present invention
It is interior.
Claims (10)
1. a kind of millimeter wave optical-electronic oscillator based on regenerative frequency dividing, which is characterized in that the optical-electronic oscillator includes: laser
Device, electro-optic intensity modulator, optical fiber energy storage link, photodetector, outside source, electric coupler, regenerative frequency unit,
External Reference phase locking unit and frequency multiplier；
The output end of the laser is connect with the light input end of the electro-optic intensity modulator, and the laser is used for output light
Carrier signal；
The output end of the electro-optic intensity modulator is connect with the input terminal of the optical fiber energy storage link, the electro-optic intensity modulation
Device generates modulated optical signal, the modulated optical signal includes plain edge for being modulated to the optical carrier
Band signal and optical carrier；
The output end of the optical fiber energy storage link is connect with the input terminal of the photodetector, and the optical fiber energy storage link is used for
The modulated optical signal is transmitted, and is used for energy storage；
The output end of the photodetector is connect with the first input end of the electric coupler, the photodetector be used for from
Modulated signal is demodulated in the modulated optical signal received, and exports electric signal；
The output end of the electric coupler is connect with the input terminal of the regenerative frequency unit, and the second of the electric coupler is defeated
The output end for entering end and outside source connects, signal that the electric coupler is used to export the photodetector and described
The microwave signal of outside source output is input to the regenerative frequency unit；
The output end of the regenerative frequency unit is connect with the input terminal of the External Reference phase locking unit, the regenerative frequency dividing
The electric signal that unit is used to export the photodetector divides；
The output end of the External Reference phase locking unit is connect with the input terminal of the frequency multiplier, and the External Reference phase locking unit is used for
Utilize the phase of the signal after external reference signal locking frequency dividing；
The output end of the frequency multiplier is connect with the microwave modulated signal input terminal of the electro-optic intensity modulator, the frequency multiplier
For frequency multiplication, so that the frequency retrieval of the signal after frequency dividing is the frequency before frequency dividing.
2. optical-electronic oscillator according to claim 1, which is characterized in that the regenerative frequency unit include frequency mixer,
Bandpass filter, microwave amplifier and the first phase shifter, wherein the first input end of the frequency mixer and the electric coupler
Output end connection, the first input end of the frequency mixer are the input terminal of the regenerative frequency unit, first phase shifter
Output end be the regenerative frequency unit output end；
The output end of the frequency mixer is connect with the input terminal of the bandpass filter, the second input terminal of the frequency mixer and institute
State the output end connection of the first phase shifter, the signal and first phase shift that the frequency mixer is used to export the electric coupler
The signal of device output is mixed；
The output end of the bandpass filter is connect with the input terminal of the microwave amplifier, and the bandpass filter is for screening
Signal after mixing, and filter out supermode noise；
The output end of the microwave amplifier is connect with the input terminal of first phase shifter, and the microwave amplifier is for amplifying
Received signal, first phase shifter are used to adjust the phase of received signal.
3. optical-electronic oscillator according to claim 1 or 2, which is characterized in that the number of the regenerative frequency unit is 1
A or multiple, multiple regenerative frequency units are connected in series.
4. optical-electronic oscillator according to claim 3, which is characterized in that the optical-electronic oscillator further includes except the regeneration
Frequency divider other than formula frequency unit, the frequency divider are connected on the output end of the regenerative frequency unit.
5. optical-electronic oscillator according to claim 2, which is characterized in that the microwave amplifier is the amplification of low noise microwave
Device.
6. optical-electronic oscillator according to claim 1, which is characterized in that the External Reference phase locking unit includes: the second shifting
Phase device, phase discriminator and proportional integral differential PID unit；
The output end of second phase shifter is the output end of the External Reference phase locking unit, and the first of second phase shifter is defeated
Enter the input terminal that end is the External Reference phase locking unit；
The output end of second phase shifter is connect with the second input terminal of the phase discriminator, and second phase shifter is for adjusting
The phase of received signal, to compensate the variation of the Resonant Intake System of the optical-electronic oscillator；
The output end of the phase discriminator is connect with the input terminal of the PID unit, the input terminal of the PID unit and described second
Second input terminal of phase shifter connects, and the signal that the phase discriminator is used to export second phase shifter is joined with from the outside
It examines signal source received signal and carries out phase demodulation, the signal that the PID unit is used to obtain phase demodulation carries out at proportional integral differential
Reason.
7. optical-electronic oscillator according to claim 6, which is characterized in that second phase shifter is electronically controlled phase shifter.
8. a kind of millimeter wave optical-electronic oscillator frequency-stabilizing method based on regenerative frequency dividing, which is characterized in that the described method includes:
Generate optical carrier；
The optical carrier is modulated, modulated optical signal is generated；
Transmit the modulated optical signal；
Modulated signal is demodulated from the modulated optical signal after transmission, and obtains electric signal；
Scaling down processing is carried out to the electric signal；
Locking phase is carried out to the signal after frequency dividing using external reference signal；
Process of frequency multiplication is carried out to the signal after locking phase, the millimeter-wave signal after obtaining frequency multiplication, and the millimeter-wave signal is modulated
Into the optical carrier.
9. according to the method described in claim 8, it is characterized in that, it is described to the electric signal carry out scaling down processing the step of,
Include:
Frequency mixing processing is carried out to the electric signal and the feedback signal received；
Signal after Frequency mixing processing is filtered；
Processing is amplified to filtered signal；
Phase shift processing is carried out to amplified signal, obtains the feedback signal.
10. method according to claim 8 or claim 9, which is characterized in that it is described using external reference signal to the letter after frequency dividing
Number carry out locking phase the step of, comprising:
Phase demodulation processing is carried out to the signal after frequency dividing using External Reference signal；
Proportional integral differential processing is carried out to the signal that phase demodulation obtains；
The signal handled according to proportional integral differential carries out phase shift processing to the signal after frequency dividing, to compensate the photoelectricity
The variation of the Resonant Intake System of oscillator.
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