CN112152726B - Phase quantization type photon digital-to-analog converter and waveform generation method based on same - Google Patents

Phase quantization type photon digital-to-analog converter and waveform generation method based on same Download PDF

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CN112152726B
CN112152726B CN202010817975.9A CN202010817975A CN112152726B CN 112152726 B CN112152726 B CN 112152726B CN 202010817975 A CN202010817975 A CN 202010817975A CN 112152726 B CN112152726 B CN 112152726B
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CN112152726A (en
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李佳钉
薛晓晓
李尚远
郑小平
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Tsinghua University
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/70—Photonic quantum communication
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/21—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  by interference
    • G02F1/225—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  by interference in an optical waveguide structure
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/35—Non-linear optics

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Abstract

The invention discloses a phase quantization type photon digital-to-analog converter and a waveform generation method based on the same, wherein the converter comprises: the device comprises a coherent light source output unit, a modulator, an optical coupler and a photoelectric detector, wherein one output end of the coherent light source output unit is connected with the input end of the modulator, the output end of the modulator is connected with one input end of the optical coupler, the other output end of the coherent light source output unit is connected with the other input end of the optical coupler, and the output end of the optical coupler is connected with the optical input end of the photoelectric detector; the coherent light source output unit outputs two paths of coherent light signals with different frequencies, one path of coherent light signal realizes the phase quantization of the coherent light signal through a modulator, the coherent light signal and the other path of coherent light signal are combined into one path through an optical coupler, and the output target radio frequency signal with the quantized phase is obtained in a photoelectric detector through beat frequency. The converter of the present invention can directly generate a broadband arbitrary phase modulated radio frequency signal output.

Description

Phase quantization type photon digital-to-analog converter and waveform generation method based on same
Technical Field
The invention relates to the technical field of signal generation, in particular to a phase quantization type photon digital-to-analog converter and a waveform generation method based on the phase quantization type photon digital-to-analog converter.
Background
The waveform generation module is one of the essential core components in modern communication systems. The arbitrary waveform generation technology, especially the generation of arbitrary radio frequency signals, is widely applied to a plurality of systems such as radar, wireless communication, satellite navigation and the like. With the development of requirements of high-precision radar imaging, high-speed low-delay wireless communication and the like, the requirements of each system on the bandwidth and the central frequency point of a transmitted signal are increasingly increased. The conventional electronic devices have problems of limited bandwidth, serious clock jitter and serious electromagnetic crosstalk, and the signal generation technologies based on the problems, such as direct frequency synthesis, electrical digital-to-analog conversion, etc., have difficulty in meeting the increasing demands for bandwidth and signal quality. Due to the property of large bandwidth of the photoelectric device, the radio frequency signal generation method based on photonics has the advantages of large bandwidth and high central frequency point. In addition, the waveform synthesis is realized on the optical domain, and the problem of electromagnetic interference between different channels and devices can be avoided.
Compared with all-optical waveform synthesis technologies such as frequency-time mapping and space-time mapping, the method has the advantages of large time-bandwidth product when any waveform is generated based on the photon digital-to-analog converter, and therefore the method is widely applied to a plurality of systems such as microwave photon radars, visible light communication and optical wireless transmission. Conventional photonic digital-to-analog converters are based on weighted-sum amplitude quantization structures. The multi-wavelength light source is utilized, the on-off of each wavelength is controlled by utilizing a plurality of paths of digital code sources, then the wavelength division multiplexing structure is combined into one path, and finally the generation of any waveform is realized through photoelectric detection. However, such a method can only generate baseband signals, and the highest frequency point of the signals must not exceed the nyquist frequency. If a radio frequency signal is generated, an optical up-conversion module is needed to be connected in series, which not only increases the complexity of the system, but also introduces other harmonic component interference to the signal.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art.
Therefore, an object of the present invention is to provide a phase quantization type photonic digital-to-analog converter, which does not need an additional optical up-conversion structure, has a low structural complexity, can directly generate a broadband radio frequency signal output modulated by any phase, and can avoid generation of additional stray components due to nonlinearity during frequency conversion, compared with an amplitude quantization type photonic digital-to-analog converter.
Another objective of the present invention is to provide a waveform generation method based on a phase quantization type photon digital-to-analog converter.
To achieve the above object, an embodiment of an aspect of the present invention provides a phase quantization type photonic digital-to-analog converter, including: the optical fiber modulator comprises a coherent light source output unit, a modulator, an optical coupler and a photoelectric detector, wherein one output end of the coherent light source output unit is connected with the input end of the modulator, the output end of the modulator is connected with one input end of the optical coupler, the other output end of the coherent light source output unit is connected with the other input end of the optical coupler, and the output end of the optical coupler is connected with the optical input end of the photoelectric detector; the coherent light source output unit outputs two paths of coherent light signals with different frequencies, one path of coherent light signal realizes the phase quantization of the coherent light signal through the modulator, the coherent light signal and the other path of coherent light signal are combined into one path through the optical coupler, and the output target radio frequency signal with the quantized phase is obtained in the photoelectric detector through beat frequency.
Compared with an amplitude quantization type photon digital-to-analog converter under the same quantization bit, the phase quantization type photon digital-to-analog converter provided by the embodiment of the invention does not need an additional optical up-conversion structure, has low structural complexity, and can directly generate a broadband radio frequency signal output modulated by any phase so as to avoid the generation of additional stray components caused by nonlinearity in the frequency conversion process.
In addition, the phase quantization type photon digital-to-analog converter according to the above embodiment of the present invention may further have the following additional technical features:
according to an embodiment of the present invention, the modulator is an Nbit optical phase quantization unit, and N is a positive integer; the Nbit optical phase quantization unit comprises N cascaded phase modulators and N paths of digital code sources.
And the frequency interval of the two paths of coherent optical signals is equal to the central frequency of the target radio frequency signal.
Wherein the response rate of the photodetector is greater than the highest frequency of the target radio frequency signal.
And the frequency interval of the two paths of coherent optical signals is smaller than the corresponding speed of the photoelectric detector.
And the code rate of the digital code source is greater than twice the highest frequency of the target radio frequency signal.
Wherein, the modulation rate of the modulator is greater than the code rate of the digital code source.
In order to achieve the above object, another embodiment of the present invention provides a waveform generating method based on a phase quantization type photon digital-to-analog converter, which adopts the phase quantization type photon digital-to-analog converter described in the above embodiment, wherein the method includes the following steps: will be provided withTarget radio frequency signal
Figure BDA0002633429880000021
Phase of
Figure BDA0002633429880000022
Sampling with the code source code rate as the sampling rate to obtain multiple different sampling points
Figure BDA0002633429880000023
And combining the plurality of different sampling points
Figure BDA0002633429880000024
Carrying out Nbit quantization according to a first preset relational expression to obtain 0-2N-1 in the range 2NA number of different quantization values psii(ii) a The quantization value psiiConverting the binary number into N bits to obtain 1-N digital code streams D'ij(ii) a One path of coherent light signal in the two paths of coherent light sources passes through the N cascaded phase modulators, and the 1-N paths of digital code streams D'ijInputting the signals into a corresponding j-th phase modulator to generate an Nbit optical phase quantization signal, wherein the amplitude of the digital code stream is controlled to
Figure BDA0002633429880000025
Vπ(j)Is the half-wave voltage of the jth phase modulator; coupling the Nbit optical phase quantization signal and the other path of coherent optical signal into a light path through the optical coupler to obtain a path of optical signal; and converting the optical signal into an electric signal through the photoelectric detector to obtain the target radio frequency signal.
Compared with the amplitude quantization type photon digital-to-analog converter under the same quantization bit, the waveform generation method based on the phase quantization type photon digital-to-analog converter of the embodiment of the invention has the advantages of no need of an additional optical up-conversion structure, low structural complexity and capability of directly generating broadband radio frequency signals output by any phase modulation so as to avoid the generation of additional stray components caused by nonlinearity in the frequency conversion process.
In addition, the waveform generation method based on the phase quantization type photon digital-to-analog converter according to the above embodiment of the present invention may further have the following additional technical features:
according to an embodiment of the present invention, the first predetermined relation is:
Figure BDA0002633429880000031
wherein the content of the first and second substances,
Figure BDA0002633429880000032
for the phase, psi, of the target radio frequency signaliIs the discrete quantized value.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
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The foregoing and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic structural diagram of a phase quantization type photonic digital-to-analog converter according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a phase quantization type photonic digital-to-analog converter according to an embodiment of the present invention;
fig. 3 is an optical phase quantization architecture for parallel mach modulators according to one embodiment of the present invention;
FIG. 4 is an optical phase quantization architecture for cascaded phase modulators according to one embodiment of the present invention;
FIG. 5 is a flowchart of a waveform generation method based on a phase quantization type photon digital-to-analog converter according to an embodiment of the present invention;
FIG. 6 is a diagram illustrating the quantization of a target RF signal and phase according to one embodiment of the present invention;
FIG. 7 is a block diagram of 2-bit phase quantization according to one embodiment of the present invention;
FIG. 8 is a time-frequency diagram of a generated chirp signal in accordance with one embodiment of the present invention;
FIG. 9 is a phase curve of a generated chirp signal in accordance with one embodiment of the present invention; and
fig. 10 is a detailed view of a phase curve of a generated chirp signal in accordance with one embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
A phase quantization type photonic digital-to-analog converter proposed according to an embodiment of the present invention and a waveform generation method based thereon will be described below with reference to the accompanying drawings, and first, the phase quantization type photonic digital-to-analog converter proposed according to an embodiment of the present invention will be described with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a phase quantization type photon digital-to-analog converter according to an embodiment of the present invention.
As shown in fig. 1, the phase quantization type photonic digital-to-analog converter 100 includes: the optical modulator comprises a coherent light source output unit 10, a modulator 20, an optical coupler 30 and a photoelectric detector 40, wherein one output end of the coherent light source output unit 10 is connected with an input end of the modulator 20, an output end of the modulator 20 is connected with one input end of the optical coupler 30, the other output end of the coherent light source output unit 10 is connected with the other input end of the optical coupler 30, and an output end of the optical coupler 30 is connected with an optical input end of the photoelectric detector 40; the coherent light source output unit 10 outputs two paths of coherent light signals with different frequencies, one path of the coherent light signal realizes phase quantization of the coherent light signal through the modulator 20, and combines the coherent light signal with the other path of the coherent light signal into one path through the optical coupler 30, and obtains an output target radio frequency signal with quantized phase through beat frequency in the photoelectric detector 40.
According to an embodiment of the present invention, as shown in fig. 3, the modulator is an Nbit optical phase quantization unit, and the Nbit optical phase quantization unit may be a structure in which M mach-zehnder modulators are connected in parallel, which isIn the formula, N is a positive integer; the Nbit optical phase quantization unit comprises an M-path digital code source, two optical couplers which divide the optical source into M paths and an M-path digital code stream modulation unit, wherein M is 2N-1(ii) a The M-path digital code stream modulation unit may include M mach-zehnder modulators and M bias controllers.
According to another embodiment of the present invention, as shown in fig. 4, the modulator is an Nbit optical phase quantization unit, and the Nbit optical phase quantization unit is a structure that N phase modulators are cascaded, where N is a positive integer; the Nbit optical phase quantization unit comprises N cascaded phase modulators and N paths of digital code sources.
Further, the components of the system of the invention are realized as follows:
the frequency interval of the two paths of coherent optical signals is equal to the central frequency of the target radio frequency signal;
the response rate of the photoelectric detector is greater than the highest frequency of the target radio frequency signal;
the frequency interval of the two paths of coherent light signals is smaller than the corresponding rate of the photoelectric detector;
the code rate of the digital code source is more than twice the highest frequency of the target radio frequency signal;
the modulation rate of the modulator is greater than the code rate of the digital code source.
In summary, compared with the amplitude quantization type photonic digital-to-analog converter under the same quantization bit, the phase quantization type photonic digital-to-analog converter of the embodiment of the present invention does not need an additional optical up-conversion structure, has a low structural complexity, and can directly generate a broadband radio frequency signal output modulated by any phase, so as to avoid the generation of additional spurious components due to nonlinearity in the frequency conversion process.
Next, a waveform generation method based on a phase quantization type photonic digital-to-analog converter according to an embodiment of the present invention will be described with reference to the drawings.
Fig. 5 is a flowchart of a waveform generation method based on a phase quantization type photon digital-to-analog converter according to an embodiment of the invention.
It should be noted that, in the embodiment of the present invention, the waveform generating method based on the phase quantization type photon digital-to-analog converter adopts the phase quantization type photon digital-to-analog converter of the above-mentioned embodiment.
As shown in fig. 5, the waveform generating method based on the phase quantization type photon digital-to-analog converter according to the embodiment of the present invention includes the following steps:
s1, transmitting the target radio frequency signal
Figure BDA0002633429880000041
Phase of
Figure BDA0002633429880000042
Sampling with the code source code rate as the sampling rate to obtain multiple different sampling points
Figure BDA0002633429880000043
And a plurality of different sampling points
Figure BDA0002633429880000044
Carrying out Nbit quantization according to a first preset relational expression to obtain 0-2N-1 in the range 2NA number of different quantization values psii。
According to an embodiment of the present invention, the first predetermined relationship is:
Figure BDA0002633429880000051
wherein the content of the first and second substances,
Figure BDA0002633429880000052
for the phase, psi, of the target radio-frequency signaliAre discrete quantized values.
S2, quantizing the value psiiConverting the binary number into N bits to obtain 1-N digital code streams D'ij。
S3, passing one path of coherent light signal in the two paths of coherent light sources through N cascaded phase modulators, and passing 1-N paths of digital code streams D'ijInputting the signals into a corresponding j-th phase modulator to generate an Nbit optical phase quantization signal, wherein the amplitude of the digital code stream is controlled to
Figure BDA0002633429880000053
Vπ(j)Is the half wave voltage of the jth phase modulator.
And S4, coupling the Nbit optical phase quantization signal and the other path of coherent optical signal into an optical path through an optical coupler to obtain one path of optical signal.
And S5, converting the optical signal into an electric signal through a photoelectric detector to obtain a target radio frequency signal.
In particular, for target radio frequency signals
Figure BDA0002633429880000054
For phase
Figure BDA0002633429880000055
Sampling with code source code rate as sampling rate and random sampling phase point
Figure BDA0002633429880000056
According to a first predetermined relation
Figure BDA0002633429880000057
Nbit quantization is carried out to obtain 0-2 at mostN-1 in the range 2NA number of different discrete quantization values psiiAs shown in fig. 6.
Then, the obtained discrete quantization value ψiConverting the digital code stream into N binary numbers to obtain 1-N digital code streams D'ij. And one path of coherent light signal in the two paths of coherent light sources passes through N cascaded phase modulators to obtain 1-N paths of digital code streams D'ijInputting the signals into a corresponding j-th phase modulator to generate an Nbit optical phase quantization signal, wherein the amplitude of the digital code stream is controlled to
Figure BDA0002633429880000058
Vπ(j)Is the half wave voltage of the jth phase modulator.
And finally, coupling the Nbit optical phase quantization signal and the other path of coherent optical signal into a light path through an optical coupler to obtain a path of optical signal, and converting the path of optical signal into an electric signal through a photoelectric detector to obtain a target radio frequency signal.
It should be noted that, in another embodiment of the present invention, the waveform generation method based on the phase quantization type photon digital-to-analog converter can also be implemented by the following process.
In particular, for target radio frequency signals
Figure BDA0002633429880000059
For phase
Figure BDA00026334298800000510
Sampling with code source code rate as sampling rate and random sampling phase point
Figure BDA00026334298800000511
According to a first predetermined relation
Figure BDA00026334298800000512
Nbit quantization is carried out to obtain 0-2 at mostN-1 in the range 2NA number of different discrete quantization values psiiAs shown in fig. 6.
Then, the obtained discrete quantization value ψiObtaining the input digital code stream D of the jth modulator in the ith sampling period according to a second preset relational expressionijWherein the second predetermined relationship is:
Figure BDA0002633429880000061
where i is the ith sampling period, j is the jth modulator, j is e {1,2,3 … N }, DijIs a digital code stream.
Then, one path of optical signal in the two paths of coherent light sources passes through one-to-2N-1A light coupler with one path (one path M paths) for generating M paths of optical signals with equal power and generating M paths of digital code streams DijModulating on-off keying OOK of M Mach-Zehnder modulators on M paths of optical signals, and introducing phase shift to each path by adjusting bias point
Figure BDA0002633429880000062
And the optical phase quantized signals of the Nbit are generated by combining the optical couplers of the M-in-one into one path.
And finally, coupling the obtained Nbit optical phase quantization signal and the other path of coherent optical signal into a light path through a two-in-one optical coupler to obtain one path of optical signal, and converting the one path of optical signal into an electric signal through a photoelectric detector to obtain a target radio frequency signal.
The waveform generation method based on the segmented photonic digital-to-analog converter will be further explained by a specific example, which is as follows:
the present embodiment takes 2bit phase quantization as an example. The 2-bit phase quantization photon digital-to-analog conversion structure is realized, and a linear frequency modulation signal generation experiment is carried out based on the structure. As shown in fig. 7, in the experiment, a 2-bit optical quantization signal was generated by two parallel mach-zehnder modulators, and the other coherent light source was realized by performing carrier-suppressed single-sideband modulation on an electrical local oscillation signal. And finally generating a 2bit phase quantization radio frequency signal through photoelectric conversion after the combination. The time-frequency curve of the generated chirp signal is shown in fig. 8, and the implementation structure shows better linearity. Fig. 9 and 10 show the phase curve and the detail diagram of the signal, and it can be seen that the phase of the signal as a whole shows the characteristics of a quadratic curve, and in the range of 0, 2 pi, the phase of the signal shows a 2bit quantization pattern.
It should be noted that the foregoing explanation of the phase quantization type photon digital-to-analog converter embodiment is also applicable to the waveform generation method based on the phase quantization type photon digital-to-analog converter of the embodiment, and details are not repeated here.
Compared with the amplitude quantization type photon digital-to-analog converter under the same quantization bit, the waveform generation method based on the phase quantization type photon digital-to-analog converter of the embodiment of the invention has the advantages of no need of an additional optical up-conversion structure, low structural complexity and capability of directly generating broadband radio frequency signals output by any phase modulation so as to avoid the generation of additional stray components caused by nonlinearity in the frequency conversion process.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims (8)

1. A phase-quantized photonic digital-to-analog converter, comprising: the optical fiber modulator comprises a coherent light source output unit, a modulator, an optical coupler and a photoelectric detector, wherein one output end of the coherent light source output unit is connected with the input end of the modulator, the output end of the modulator is connected with one input end of the optical coupler, the other output end of the coherent light source output unit is connected with the other input end of the optical coupler, and the output end of the optical coupler is connected with the optical input end of the photoelectric detector; the coherent light source output unit outputs two paths of coherent light signals with different frequencies, one path of coherent light signal realizes the phase quantization of the coherent light signal through the modulator, the coherent light signal and the other path of coherent light signal are combined into one path through the optical coupler, and the output target radio frequency signal with the quantized phase is obtained in the photoelectric detector through beat frequency;
the modulator is an Nbit optical phase quantization unit, the Nbit optical phase quantization unit is in a structure of M Mach-Zehnder modulators connected in parallel, wherein N is a positive integer, the Nbit optical phase quantization unit comprises M paths of digital code sources, two optical couplers which are divided into M paths, and M paths of digital code stream modulation units, wherein M is 2N-1; the M paths of digital code stream modulation units comprise M Mach-Zehnder modulators and M bias controllers; the Nbit optical phase quantization unit is in a structure of cascading N phase modulators, wherein N is a positive integer; the Nbit optical phase quantization unit comprises N cascaded phase modulators and N paths of digital code sources.
2. The phase quantization type photonic digital-to-analog converter according to claim 1, wherein the frequency interval of the two coherent optical signals is equal to the center frequency of the target radio frequency signal.
3. The phase quantized photonic digital to analog converter according to claim 1, wherein the response rate of said photodetector is greater than the highest frequency of said target radio frequency signal.
4. The phase quantization type photonic digital-to-analog converter according to claim 1, wherein a frequency interval of the two coherent optical signals is smaller than a corresponding rate of the photodetector.
5. The phase-quantized photonic digital-to-analog converter according to claim 1, wherein the code rate of the digital code source is greater than twice the highest frequency of the target radio frequency signal.
6. The phase-quantized photonic digital-to-analog converter according to claim 1, wherein the modulation rate of the modulator is greater than the code rate of the digital code source.
7. A waveform generation method based on a phase quantization type photon digital-to-analog converter, characterized in that the phase quantization type photon digital-to-analog converter according to any one of claims 1 to 6 is adopted, and the method comprises the following steps:
RF signal of target
Figure FDA0003221703390000011
Phase of
Figure FDA0003221703390000012
Sampling with the code source code rate as the sampling rate to obtain multiple different sampling points
Figure FDA0003221703390000021
And combining the plurality of different sampling points
Figure FDA0003221703390000022
Carrying out Nbit quantization according to a first preset relational expression to obtain 0-2N-1 in the range 2NA number of different quantization values psii；
The quantization value psiiConverting into N-bit binary number to obtain1-N digital code stream D'ij；
One path of coherent light signal in the two paths of coherent light sources passes through the N cascaded phase modulators, and the 1-N paths of digital code streams D'ijInputting the signals into a corresponding j-th phase modulator to generate an Nbit optical phase quantization signal, wherein the amplitude of the digital code stream is controlled to
Figure FDA0003221703390000023
Vπ(j)Is the half-wave voltage of the jth phase modulator;
coupling the Nbit optical phase quantization signal and the other path of coherent optical signal into a light path through the optical coupler to obtain a path of optical signal;
and converting the optical signal into an electric signal through the photoelectric detector to obtain the target radio frequency signal.
8. The method for generating a waveform based on a phase quantization type photon digital-to-analog converter according to claim 7, wherein the first predetermined relation is:
Figure FDA0003221703390000024
wherein the content of the first and second substances,
Figure FDA0003221703390000025
for the phase, psi, of the target radio frequency signaliIs the quantized value.
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