CN109450551A - A kind of multi-octave phase-moving method and device - Google Patents
A kind of multi-octave phase-moving method and device Download PDFInfo
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Abstract
The present invention discloses a kind of multi-octave phase-moving method and device, this method comprises: carrying out signal modulation to light carrier first generates a branch of crossed polarized light；Beam crossed polarized light single order side band phase factor on two mutually orthogonal polarization direction is opposite, the second order side band phase factor is identical；And the beam crossed polarized light is divided into the first sub- crossed polarized light and the second sub- crossed polarized light；Then the first sub- crossed polarized light and the second sub- crossed polarized light are converted into opposite the first circularly polarized light and the second circularly polarized light in direction of rotation；Analyzing is carried out to the first circularly polarized light and the second circularly polarized light；Photoelectric conversion is carried out finally by difference detecting, the fundamental frequency photo-signal after obtaining phase shift.The device includes signal modulation unit, the first Polarization Controller, the second analyzing controller, the first analyzer, the second analyzer and balanced detector.The present invention is based on the second-order distortions that Polarization Modulation and difference detecting inhibit photon microwave phase shift link, improve the accuracy of phase shift.
Description
Technical field
The present invention relates to microwave phase shift field, in particular to a kind of multi-octave phase-moving method and device.
Background technique
Microwave phase shifter is the basic Component units of the systems such as beam forming, microwave filtering.Traditional microwave phase shifter, band
Wide and precision is limited by electronic bottleneck.In order to solve the bottleneck of these electronics, the microwave phase shift based on photonics is proposed
Scheme, photonics method have high frequency, big bandwidth, the characteristic of immune electromagnetic interference.The microwave phase shift scheme of photonics is due to adjusting
Device processed it is non-linear, second-order distortion can be caused, when the power and bandwidth of the radiofrequency signal of input are sufficiently large, second-order distortion meeting and base
There are frequency spectrums to overlap for frequency signal, and frequency spectrum is overlapped and can not be eliminated using filter, and then will affect the accuracy of phase shift, no
Suitable for multi-octave link.In multi-octave phase shift link, the influence of second-order distortion how is eliminated, improves the accurate of phase shift
Degree, becomes a technical problem urgently to be resolved.
Summary of the invention
The object of the present invention is to provide a kind of multi-octave phase-moving methods and device to be mentioned with eliminating the influence of second-order distortion
The accuracy of high phase shift.
To achieve the above object, the present invention provides following schemes:
The first aspect of the embodiment of the present invention provides a kind of multi-octave phase-moving method, includes the following steps:
Signal modulation is carried out to light carrier and generates a branch of crossed polarized light；The beam crossed polarized light is mutually orthogonal at two
Polarization direction on the single order side band phase factor is opposite, the second order side band phase factor is identical；
The Shu Suoshu crossed polarized light is divided into the first sub- crossed polarized light and the second sub- crossed polarized light；
First sub- crossed polarized light and the second sub- crossed polarized light are converted into the first opposite circularly polarized light of direction of rotation
With the second circularly polarized light；
Analyzing is carried out to the first circularly polarized light and the second circularly polarized light；
Photoelectric conversion is carried out by difference detecting after analyzing, the fundamental frequency photo-signal after obtaining phase shift.
Optionally, the first sub- crossed polarized light and the second sub- crossed polarized light are converted into the first opposite circle of direction of rotation
Polarised light and the second circularly polarized light, specifically include:
The phase difference between the first sub- crossed polarized light and the orthogonal polarisation state of the second sub- crossed polarized light is adjusted respectively, it will
First sub- crossed polarized light and the second sub- crossed polarized light are converted to the first opposite circularly polarized light of direction of rotation and the second circle is inclined
Shake light.
Optionally, analyzing is carried out to the first circularly polarized light and the second circularly polarized light, comprising:
Control the analyzing angle of the first circularly polarized light and the analyzing angle of the second circularly polarized light, the fundamental frequency photoelectricity after making phase shift
Amplitude and the Phase Continuation for flowing signal are adjustable.
Optionally, the electric field of crossed polarized light is shown below:
Wherein, x and y indicates two mutually orthogonal polarization directions, ExAnd EyThe crossed polarized light is respectively indicated in the direction x
With the electric field in the direction y, m indicates that modulation factor, ω indicate that the angular frequency of light source, Ω indicate to need to carry out the radiofrequency signal of phase shift
Angular frequency, J0(m)、J1(m) and J2(m) 0 rank, 1 rank and 2 rank Bessel function of the first kind are respectively indicated.
Optionally, the electric field of the first sub- crossed polarized light is shown below:
The electric field of second sub- crossed polarized light is shown below:
Wherein, Ex1And Ey1Respectively indicate electric field of the first sub- crossed polarized light in the direction x and the direction y, Ex2And Ey2Table respectively
Show the second sub- crossed polarized light in the electric field in the direction x and the direction y,Be respectively the first sub- crossed polarized light and second son just
Hand over the phase difference between polarised light orthogonal polarisation state.
Optionally, analyzing is carried out to the first circularly polarized light and the second circularly polarized light, specifically included:
Analyzing is carried out to first circularly polarized light, the first linearly polarized light after obtaining analyzing, first after the analyzing
The electric field E of linearly polarized light1Are as follows:
Analyzing is carried out to second circularly polarized light, the second linearly polarized light after obtaining analyzing, second after the analyzing
The electric field E of linearly polarized light2Are as follows:
Wherein, α1Indicate the first analyzing angle, α2Indicate the second analyzing angle, Ex1And Ey1It is orthogonal partially to respectively indicate the first son
Shake electric field of the light in the direction x and the direction y, Ex2And Ey2The second sub- crossed polarized light is respectively indicated in the electric field in the direction x and the direction y.
Optionally, photoelectric conversion is carried out by difference detecting after analyzing, the fundamental frequency photo-signal after obtaining phase shift, specifically
Include:
The first linearly polarized light after analyzing and the second linearly polarized light after analyzing are subjected to photoelectric conversion by difference detecting,
Fundamental frequency photo-signal after obtaining phase shift, is shown below:
Wherein, E1The electric field of the first linearly polarized light after indicating analyzing, E2The electricity of the second linearly polarized light after indicating analyzing
, m is modulation factor, and Ω is the angular frequency for needing to carry out the radiofrequency signal of phase shift, J0(m)、J1(m) and J2(m) 0 is respectively indicated
Rank, 1 rank and 2 rank Bessel function of the first kind, α1Indicate the first analyzing angle, α2Indicate the second analyzing angle.
The second aspect of the embodiment of the present invention provides a kind of multi-octave phase shifting equipment, comprising: signal modulation list
Member, the first Polarization Controller, the second analyzing controller, the first analyzer, the second analyzer and balanced detector；
Signal modulation unit, for generating a branch of crossed polarized light；The beam crossed polarized light is mutually orthogonal at two
The single order side band phase factor is opposite on polarization direction, the second order side band phase factor is identical；And the beam crossed polarized light is divided into
First sub- crossed polarized light and the second sub- crossed polarized light；
First Polarization Controller is used to adjust the phase difference of the orthogonal polarisation state of the first sub- crossed polarized light, obtains the first circle
Polarised light；Second Polarization Controller is used to adjust the phase difference of the orthogonal polarisation state of the second sub- crossed polarized light, obtains the second circle
Polarised light；
First analyzer is used to carry out analyzing to the first circularly polarized light, the first linearly polarized light after obtaining analyzing；Second inspection
Inclined device is used to carry out analyzing to the second circularly polarized light, the second linearly polarized light after obtaining analyzing；
Balanced detector is used to visit the first linearly polarized light after analyzing and the second linearly polarized light after analyzing by difference
Fundamental frequency photo-signal after measuring phase shift.
Optionally, the first Polarization Controller and the second Polarization Controller are respectively used to adjust the first circular polarization of phase official post
The direction of rotation of light and the second circularly polarized light is opposite.
Optionally, the first analyzer and the second analyzer are respectively used to the analyzing angle and the of the first circularly polarized light of control
The analyzing angle of two circularly polarized lights, the amplitude and Phase Continuation of the fundamental frequency photo-signal after making phase shift are adjustable.
The specific embodiment provided according to the present invention, the invention discloses following technical effects:
The invention discloses a kind of multi-octave phase-moving method and devices, carry out signal modulation to optical carrier and generate one
Beam crossed polarized light；Beam crossed polarized light single order side band phase factor on two mutually orthogonal polarization direction is opposite,
The second order side band phase factor is identical；The beam crossed polarized light is divided into the first sub- crossed polarized light and the second sub- cross-polarization
Light, later by the first sub- crossed polarized light and the second sub- crossed polarized light be converted to the first opposite circularly polarized light of direction of rotation and
Second circularly polarized light；Then, analyzing and difference detecting are carried out to the first circularly polarized light and the second circularly polarized light respectively, so that restoring
The second harmonic in fundamental frequency photo-signal out is suppressed, since the amplitude of second order intermodulation distortion is the second harmonic distortion
Two times, in turn, second order intermodulation distortion is also suppressed, in this way, the influence of the second-order distortion in multi-octave phase shift link is eliminated,
Improve the accuracy of phase shift.
Detailed description of the invention
It in order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, below will be to institute in embodiment
Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the invention
Example, for those of ordinary skill in the art, without any creative labor, can also be according to these attached drawings
Obtain other attached drawings.
Fig. 1 is a kind of flow chart of one embodiment of multi-octave phase-moving method provided by the invention；
Fig. 2 is a kind of light channel structure schematic diagram of one embodiment of multi-octave phase shifting equipment provided by the invention.
Specific embodiment
The object of the present invention is to provide a kind of multi-octave phase-moving methods and device to be mentioned with eliminating the influence of second-order distortion
The accuracy of high phase shift.
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, with reference to the accompanying drawing and specific real
Mode is applied to be described in further detail invention.
Embodiment 1
The embodiment of the present invention 1 provides a kind of multi-octave phase-moving method, as shown in Figure 1, this method comprises the following steps:
Step 101, signal modulation is carried out to light carrier and generates a branch of crossed polarized light；The beam crossed polarized light is at two
The single order side band phase factor is opposite on mutually orthogonal polarization direction, the second order side band phase factor is identical.
Wherein, as an embodiment, signal modulation includes the signal processing modes such as Polarization Modulation and filtering.
Step 102, which is divided into the first sub- crossed polarized light and the second sub- crossed polarized light；
Step 103, that the first sub- crossed polarized light and the second sub- crossed polarized light be converted to direction of rotation respectively is opposite
First circularly polarized light and the second circularly polarized light.
Step 104, analyzing is carried out to the first circularly polarized light and the second circularly polarized light respectively.
Step 105, photoelectric conversion is carried out by difference detecting after analyzing, the fundamental frequency photo-signal after obtaining phase shift.
A kind of multi-octave phase-moving method of the invention, by signal modulation generate it is a branch of meet specified conditions it is orthogonal partially
Shake light, circularly polarized light is respectively converted into after being divided equally, then pass through analyzing, difference detecting, it is suppressed that photon microwave phase shift link
Second-order distortion, improve the accuracy of phase shift.
Embodiment 2
The embodiment of the present invention 2 provides an a kind of preferred embodiment of multi-octave phase-moving method.
Optical path shown in Figure 2, in this embodiment, firstly, passing through the signal processings sides such as Polarization Modulation and filtering
Formula generates a branch of crossed polarized light；Beam crossed polarized light single order side band phase on two mutually orthogonal polarization direction
The factor is opposite, the phase factor of second order sideband is identical.The electric field of the crossed polarized light is represented by
Wherein x and y indicates two mutually orthogonal polarization directions, ExAnd EyRespectively indicate the crossed polarized light in the direction x and
The electric field in the direction y, m are modulation factors, and ω is the angular frequency of light source, and Ω is the angular frequency for needing to carry out the radiofrequency signal of phase shift,
JnIt (m) is n rank Bessel function of the first kind.Exp is i.e. using natural constant e as the exponential function at bottom.
Then, which is uniformly divided into two parts, is the first sub- crossed polarized light and the second son respectively
Crossed polarized light constructs two channel Cs H1, CH2, passes through the first sub- crossed polarized light and the second sub- crossed polarized light respectively.
The electric field of first sub- crossed polarized light and the second sub- crossed polarized light can be expressed as
WhereinIt is the phase between the first sub- crossed polarized light and the second sub- crossed polarized light orthogonal polarisation state respectively
Potential difference, i.e.,It is the phase difference between the first direction sub- crossed polarized light x and the lightwave signal in the direction y,It is that the second son is orthogonal
Phase difference between the direction polarised light x and the direction y lightwave signal.
Then, orthogonal polarisation state/orthogonal side can be controlled by Polarization Controller PC (polarization controller)
Phase difference betweenWithSo that the two crossed polarized lights are circularly polarized light but direction of rotation on the contrary, namely
Later, the two circularly polarized lights are by two analyzer analyzings.The electric field of signal can be expressed as after analyzing
Wherein α1, α2It is analyzing angle.
Finally, be detected optical signal to the rear inject a balanced detector (BPD, balanced photodetector) into
Row photoelectric conversion.The electric field for the photoelectric current that BPD is recovered can be expressed as
It can be seen that flip-flop and the second harmonic are suppressed.Due toSo second order inter-modulation
The amplitude of distortion is two times of the second harmonic distortion.In turn, second order intermodulation distortion is also suppressed.
WhereinWithRespectively E1And E2Conjugation, the electric field of the fundamental frequency photo-signal after i (t) i.e. phase shift.
By controlling analyzing angle [alpha]1And α2, the amplitude and Phase Continuation of fundamental frequency signal are adjustable.This is arrived, it is more to realize full light
The phase shift of octave.
Wherein formula (1)-(6) correspond respectively to the electric field at the place (a)-(f) in Fig. 2.
The embodiment of the present invention generates a branch of single order sideband on two mutually orthogonal polarization direction by signal modulation
Phase factor is opposite, the identical crossed polarized light of the second order side band phase factor, by constructing two channels after so being divided equally, into
The adjusting of row binary channels polarization state, analyzing, difference detecting, so that the second-order distortion after two channels progress photoelectric conversions mutually supports
Disappear.Also, the analyzing angle by adjusting two channels exports the amplitude and phase of fundamental frequency signal to adjust, and exports base adjusting
While the amplitude and phase of frequency signal, second-order distortion remains to be suppressed.
Embodiment 3
The embodiment of the present invention 3 provides a kind of multi-octave phase shifting equipment, as shown in Fig. 2, phase shifting equipment includes: signal tune
Unit (being not shown in Fig. 2) processed, the first Polarization Controller PC1, the second analyzing controller PC2, the first analyzer Pol1, the second inspection
Inclined device Pol2 and balanced detector BPD.
Signal modulation unit generates a branch of crossed polarized light by signal processing modes such as Polarization Modulation and filtering
(a)；The beam crossed polarized light (a) single order side band phase factor on two mutually orthogonal polarization direction is opposite.Second order side
The phase factor of band is identical.The crossed polarized light (a) is uniformly divided into two parts later, obtains the first sub- crossed polarized light (b)
With the second sub- crossed polarized light (c).
First Polarization Controller PC1 is used to adjust the phase difference of the orthogonal polarisation state of the first sub- crossed polarized light (b), obtains
First circularly polarized light；Second Polarization Controller PC2 is used to adjust the phase of the orthogonal polarisation state of the second sub- crossed polarized light (c)
Difference obtains the second circularly polarized light.
Preferably as a kind of embodiment, keep the direction of rotation of the first circularly polarized light and the second circularly polarized light opposite.
First analyzer Pol1 is used to carry out analyzing to the first circularly polarized light, the first linearly polarized light (d) after obtaining analyzing.
Second analyzer Pol2 is used to carry out analyzing to the second circularly polarized light, the second linearly polarized light (e) after obtaining analyzing.Pol, i.e.,
Polarizer, polaroid.
Balanced detector BPD is used for logical to the first linearly polarized light (d) after analyzing and the second linearly polarized light (e) after analyzing
It crosses difference detecting and obtains the fundamental frequency photo-signal (f) after phase shift.Referring to fig. 2, PD there are two being set inside balanced detector BPD
(photodetector, photodetector), respectively PD1 and PD2, it is preferable that the first linearly polarized light (d) and inspection after analyzing
Second linearly polarized light (e) to the rear carries out photoelectric conversion by PD1 and PD2 respectively, after then carrying out calculus of differences output phase shift
Fundamental frequency photo-signal (f).
Of the invention a kind of multi-octave phase-moving method and device, inhibit photon microwave based on Polarization Modulation and difference detecting
The second-order distortion of phase shift link improves the accuracy of phase shift.Specifically, a branch of single order side band phase factor is opposite, second order sideband
The identical crossed polarized light of phase factor is equably divided into two parts；Then it is each to change respectively to adjust Polarization Controller
The polarization state of partial orthogonality polarised light, so that this two parts light becomes the circularly polarized light with opposite direction of rotation；Finally by
Polarization Controller or analyzer are adjusted to change analyzing angle, realizes that the fundamental frequency photo-signal for taking to come to photodetector is shaken
The adjusting of width and phase.Simultaneously as second-order distortion photoelectric current that this two parts optical signal is taken is equal in magnitude, phase is identical and
Not with the phase change of fundamental frequency photo-signal, the available good inhibition after balance detection.
Each embodiment in this specification is described in a progressive manner, the highlights of each of the examples are with other
The difference of embodiment, the same or similar parts in each embodiment may refer to each other.
Specific examples are used herein to describe the principles and implementation manners of the present invention, the explanation of above embodiments
Method and its core concept of the invention are merely used to help understand, described embodiment is only that a part of the invention is real
Example is applied, instead of all the embodiments, based on the embodiments of the present invention, those of ordinary skill in the art are not making creation
Property labour under the premise of every other embodiment obtained, shall fall within the protection scope of the present invention.
Claims (10)
1. a kind of multi-octave phase-moving method, which is characterized in that the phase-moving method includes the following steps:
Signal modulation is carried out to light carrier and generates a branch of crossed polarized light；The crossed polarized light is mutually orthogonal inclined at two
The single order side band phase factor on direction of shaking is opposite, the second order side band phase factor is identical；
The Shu Suoshu crossed polarized light is divided into the first sub- crossed polarized light and the second sub- crossed polarized light；
It is inclined that described first sub- crossed polarized light and the second sub- crossed polarized light are converted into the first opposite circle of direction of rotation
Shake light and the second circularly polarized light；
Analyzing is carried out to first circularly polarized light and second circularly polarized light；
Photoelectric conversion is carried out by difference detecting after analyzing, the fundamental frequency photo-signal after obtaining phase shift.
2. a kind of multi-octave phase-moving method according to claim 1, which is characterized in that described that first son is orthogonal
Polarised light and the second sub- crossed polarized light are converted to opposite the first circularly polarized light and the second circularly polarized light in direction of rotation, tool
Body includes:
The phase difference between the first sub- crossed polarized light and the orthogonal polarisation state of the second sub- crossed polarized light is adjusted respectively, it will be described
First sub- crossed polarized light and the second sub- crossed polarized light are converted to opposite the first circularly polarized light and second in direction of rotation
Circularly polarized light.
3. a kind of multi-octave phase-moving method according to claim 1, which is characterized in that first circularly polarized light and
Second circularly polarized light carries out analyzing, comprising:
The analyzing angle of the first circularly polarized light and the analyzing angle of the second circularly polarized light, the fundamental frequency photoelectricity after making phase shift are controlled respectively
Amplitude and the Phase Continuation for flowing signal are adjustable.
4. a kind of multi-octave phase-moving method according to claim 1, which is characterized in that the electric field of the crossed polarized light
It is shown below:
Wherein, x and y indicates two mutually orthogonal polarization directions, ExAnd EyThe crossed polarized light is respectively indicated in the direction x and y
The electric field in direction, m indicate that modulation factor, ω indicate that the angular frequency of light source, Ω indicate to need to carry out the angle of the radiofrequency signal of phase shift
Frequency, J0(m)、J1(m) and J2(m) 0 rank, 1 rank and 2 rank Bessel function of the first kind are respectively indicated.
5. a kind of multi-octave phase-moving method according to claim 4, which is characterized in that the first sub- crossed polarized light
Electric field be shown below:
The electric field of the second sub- crossed polarized light is shown below:
Wherein, Ex1And Ey1Respectively indicate electric field of the described first sub- crossed polarized light in the direction x and the direction y, Ex2And Ey2Table respectively
Show the described second sub- crossed polarized light in the electric field in the direction x and the direction y, Be respectively the described first sub- crossed polarized light and
Phase difference between the second sub- crossed polarized light orthogonal polarisation state.
6. a kind of multi-octave phase-moving method according to claim 5, which is characterized in that first circularly polarized light and
Second circularly polarized light carries out analyzing, specifically includes:
Analyzing is carried out to the described first sub- crossed polarized light, the first linearly polarized light after obtaining analyzing, first after the analyzing
The electric field E of linearly polarized light1Are as follows:
Analyzing is carried out to the described second sub- crossed polarized light, the second linearly polarized light after obtaining analyzing, second after the analyzing
The electric field E of linearly polarized light2Are as follows:
Wherein, α1Indicate the first analyzing angle, α2Indicate the second analyzing angle, Ex1And Ey1It is orthogonal partially to respectively indicate first son
Shake electric field of the light in the direction x and the direction y, Ex2And Ey2The described second sub- crossed polarized light is respectively indicated in the direction x and the direction y
Electric field.
7. a kind of multi-octave phase-moving method according to claim 1-6, which is characterized in that lead to after the analyzing
It crosses difference detecting and carries out photoelectric conversion, the fundamental frequency photo-signal after obtaining phase shift specifically includes:
The first linearly polarized light after analyzing and the second linearly polarized light after analyzing are subjected to photoelectric conversion by difference detecting, obtained
Fundamental frequency photo-signal after phase shift, is shown below:
Wherein, E1The electric field of the first linearly polarized light after indicating analyzing, E2The electric field of the second linearly polarized light after indicating analyzing, m are
Modulation factor, Ω are the angular frequency for needing to carry out the radiofrequency signal of phase shift, J0(m)、J1(m) and J2(m) 0 rank, 1 rank are respectively indicated
With 2 rank Bessel function of the first kind, α1Indicate the first analyzing angle, α2Indicate the second analyzing angle,WithRespectively E1And E2
Conjugation, the electric field of the fundamental frequency photo-signal after i (t) i.e. phase shift.
8. a kind of multi-octave phase shifting equipment, which is characterized in that the phase shifting equipment includes: signal modulation unit, the first polarization
Controller, the second analyzing controller, the first analyzer, the second analyzer and balanced detector；
The signal modulation unit, for generating a branch of crossed polarized light, the beam crossed polarized light is mutually orthogonal at two
The single order side band phase factor is opposite on polarization direction, the second order side band phase factor is identical；And it is the Shu Suoshu crossed polarized light is equal
It is divided into the first sub- crossed polarized light and the second sub- crossed polarized light；
First Polarization Controller is used to adjust the phase difference of the orthogonal polarisation state of the first sub- crossed polarized light, obtains the first circle
Polarised light；Second Polarization Controller is used to adjust the phase difference of the orthogonal polarisation state of the second sub- crossed polarized light, obtains the
Two circularly polarized lights；
First analyzer is used to carry out analyzing to first circularly polarized light, the first linearly polarized light after obtaining analyzing；Institute
The second analyzer is stated for the second linearly polarized light to second circularly polarized light progress analyzing, after obtaining analyzing；
The balanced detector is used to visit the first linearly polarized light after analyzing and the second linearly polarized light after analyzing by difference
Fundamental frequency photo-signal after measuring phase shift.
9. a kind of multi-octave phase shifting equipment according to claim 8, which is characterized in that first Polarization Controller and
Second Polarization Controller is respectively used to inclined by adjusting the first circularly polarized light described in the phase official post and second circle
The direction of rotation of vibration light is opposite.
10. a kind of multi-octave phase shifting equipment according to claim 8, which is characterized in that first analyzer and institute
The second analyzer is stated, is respectively used to control the analyzing angle of the analyzing angle of first circularly polarized light and second circularly polarized light
Degree, the amplitude and Phase Continuation of the fundamental frequency photo-signal after making phase shift are adjustable.
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| CN105676206A (en) * | 2016-01-14 | 2016-06-15 | 中国人民解放军空军工程大学 | Linear frequency-modulated signal microwave photon frequency multiplication method and device |
| CN106299977A (en) * | 2016-09-19 | 2017-01-04 | 西安电子科技大学 | The device and method of two frequency multiplication photoelectric oscillator based on phase-modulation |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114204997A (en) * | 2021-11-24 | 2022-03-18 | 北京印刷学院 | Optical generation method and device for 32 frequency doubling millimeter wave signal |
| CN114204997B (en) * | 2021-11-24 | 2023-03-07 | 北京印刷学院 | Optical generation method and device for 32 frequency doubling millimeter wave signal |
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