CN114070412B - Photon reconfigurable waveform generation method and device - Google Patents
Photon reconfigurable waveform generation method and device Download PDFInfo
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- H—ELECTRICITY
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Abstract
The invention discloses a photon reconfigurable waveform generation method, which generates a pair of orthogonal polarization and comb teeth with the same numberNOptical frequency comb with constant gap between comb teeth: a carrier optical frequency comb and a local oscillator optical frequency comb; the combined beam optical signals of the two pass through a polarization controller and then are input into a polarization division multiplexing double-balanced modulator, an intermediate frequency electric chirp signal and an electric control signal are respectively input into two sub double-balanced modulators, and the two sub double-balanced modulators work in a carrier suppression single-sideband modulation mode; dividing the optical signal output by the polarization division multiplexing double-balanced modulator into two parts after passing through an analyzerNAn optical channel; will be provided withNPhotoelectric conversion of individual optical channelsNPerforming delay matching on the sub-electrical chirp signals; fromNAnd selecting a plurality of continuous sub-chirp signals for splicing and combining to obtain a chirp signal with reconfigurable center frequency, bandwidth and time width. The invention also discloses a photon reconfigurable waveform generating device. The invention can realize flexible reconfiguration of center frequency, bandwidth and time width.
Description
Technical Field
The invention relates to a waveform generation method, in particular to a photon reconfigurable waveform generation method, and belongs to the technical field of microwave photons.
Background
With the increasing complexity of the electromagnetic environment, the requirements on the radar system are gradually increased by continuously updating and iterating the combat mode. On one hand, the radar is required to realize a high-precision, long-distance and anti-interference detection target, on the other hand, the radar is required to be flexibly adjusted according to a battlefield environment to adapt to different requirements, and therefore the working center frequency, bandwidth and time width of the radar are required to be flexibly changed. Therefore, the transmitting signals of the radar system need to be flexible and changeable, and can be rapidly switched according to different battlefield environments. The reconfiguration of the bandwidth, the center frequency and the time width of the transmitted signal can help the radar to realize different detection targets, and in addition, the flexibility of the transmitted signal is improved by arbitrarily controlling the amplitude and the phase of the signal, so that the method has important significance to a radar system.
The traditional electronic signal generation methods mainly comprise two methods, namely an analog method and a digital method. The analog method generally utilizes a voltage-controlled oscillator or a surface acoustic wave device, and the voltage-controlled method has the problems that the phases of initial pulses are not coherent and the stability is poor, so that the quality of generated broadband signals is poor. Surface Acoustic Wave (SAW) methods produce signals with narrow pulse widths and complex and bulky systems due to limitations in the performance of electronic devices. The digital method, which mainly generates signals through a Direct Digital Synthesizer (DDS), has an advantage in that amplitude, phase and frequency manipulation of output waveforms can be precisely performed, but the center frequency and bandwidth of generated signals are limited due to limitations of electronic bottlenecks. The requirement of radar systems for large bandwidth transmission of signals still faces challenges and requires flexible and adjustable parameters of the transmitted signals.
In order to break through the electronic bottleneck, the photonic technology has attracted much attention in recent years by virtue of its advantages of low loss, light weight, large bandwidth, electromagnetic interference resistance, and the like. Signal generation schemes based on photonic technology have been developed, mainly divided into: mapping method, light injection method and frequency doubling method. The mapping method can be divided into a wavelength-time mapping method and a frequency-time mapping scheme, and a typical scheme of the wavelength-time mapping method (Zhang H, zou W, chen J. Generation of a wide tunable linear wave form based on spectral filtering and unbalanced dispersion [ J ]. Optics Letters,2015,40 (6): 1085-1088.) is implemented by filtering and unbalanced dispersion in the frequency domain, and optical pulses with different dispersions enter a photoelectric detector to be converted into electric signals to obtain linearly chirped waveform signals. The desired waveform can be obtained by tuning the passband of the optical filter, but is typically on the order of nanoseconds wide. Frequency-time mapping schemes typically require an optical spectrum shaper, which consists of a differential group delay device, two polarization controllers and a polarization beam splitter in the literature (Zhang F, ge X, pan s. After the short light pulse passes through the spectrum shaper and the dispersion element, the required microwave signal can be obtained through balanced photoelectric detection. The advantage of this scheme is that low frequency spurious interference is avoided using balanced detection, but the scheme is significantly affected by polarization and temperature. The optical injection technology (Zhou P, zhang F, guo Q, et al. Linear-chirped microwave generation with large-time-based width product by optically injected semiconductor laser [ J ]. Optics Express,2016,24 (16): 18460-18467.) is implemented by using a semiconductor laser operating in a P1 oscillation state, and the center frequency, bandwidth and time width of a generated linear chirp signal can be controlled by adjusting the waveform and injection strength of an electric control signal, but the frequency of the generated signal does not strictly linearly change with time due to the temperature sensitivity of the semiconductor laser, and a feedback loop or a temperature control device is required to compensate. The frequency multiplication method is realized by an integrated electro-optical modulator (Guo Q, zhang F, zhou P, et al, dual-band LFM signal generation by optical frequency squaring and polarization multiplexing [ J ]. IEEE Photonics technologies Letters,2017,29 (16): 1320-1323.), carrier suppression is realized by a bias-division multiplexing double balanced modulator, only positive and negative second-order sidebands are left, and the final output signal is four times of the original loading signal, so that a signal four times of the center frequency and the bandwidth of the original signal can be generated.
In summary, the traditional chirp signal generation scheme is limited in reconfigurability, cannot meet the electronic combat requirements under increasingly complex electromagnetic environments, and seriously restricts the reconfigurability and the multi-functionalization of integrated radio frequency integrated systems such as radars and satellites.
Disclosure of Invention
The technical problem to be solved by the invention is to overcome the defects in the prior art and provide a method for generating a photon reconfigurable waveform, which can realize flexible reconfiguration of center frequency, bandwidth and time width, greatly expand the bandwidth and time width of a generated chirp signal, and flexibly control the amplitude, phase and center frequency of the generated chirp signal in an optical domain.
The invention specifically adopts the following technical scheme to solve the technical problems:
a photon reconfigurable waveform generation method generates a pair of optical frequency combs which have orthogonal polarization and N comb teeth, and the interval difference between the comb teeth is a fixed value: the device comprises a carrier optical frequency comb and a local oscillator optical frequency comb, wherein N is an integer greater than 1; the combined beam optical signal of a carrier optical frequency comb and a local oscillator optical frequency comb passes through a polarization controller and then is input into an optical input end of a polarization division multiplexing double-balanced modulator, an intermediate frequency electric chirp signal and an electric control signal are respectively input into microwave input ends of two sub double-balanced modulators of the polarization division multiplexing double-balanced modulator, the sub double-balanced modulators input by the intermediate frequency electric chirp signal and the electric control signal are respectively made to work in a carrier suppression double-sideband modulation state and a carrier suppression single-sideband modulation state, and the optical signal output by the polarization division multiplexing double-balanced modulator passes through an analyzer; dividing the optical signal after passing through the analyzer into N optical channels, wherein the ith optical channel comprises an ith comb tooth of the carrier optical frequency comb and an ith comb tooth of the local oscillator optical frequency comb; photoelectrically converting the N optical channels into N sub-electric chirp signals and performing delay matching; and selecting a plurality of continuous sub-electrical chirp signals from the N sub-electrical chirp signals to carry out splicing combination to obtain a chirp signal with reconfigurable center frequency, bandwidth and time width.
Preferably, the division of the optical signal is performed by N optical filters, or programmable optical processors, with adjustable bandwidth and center frequency.
Further, the photon reconfigurable waveform generation method further comprises: and adjusting at least one of three parameters of the amplitude, the phase and the center frequency of the N sub-electrical chirp signals to regulate and control the parameters of the reconfigurable chirp signal.
Further, the phase of the N sub-electrical chirp signals is adjusted by changing a bias voltage of the polarization division multiplexing double balanced modulator, the amplitude of the N sub-electrical chirp signals is adjusted by changing an analysis angle of the analyzer, and the center frequency of the N sub-electrical chirp signals is adjusted by changing a frequency of the electric control signal.
Preferably, the carrier optical frequency comb and the local oscillator optical frequency comb satisfy the following condition:
NΔf+f 0 +B＜f s
where Δ f is the difference between the comb teeth intervals, f 0 B is the initial frequency, bandwidth, f of the intermediate frequency chirp signal s The comb teeth intervals of the carrier optical frequency comb.
Based on the same inventive concept, the following technical scheme can be obtained:
a photonic reconfigurable waveform generation apparatus, comprising:
the polarization orthogonal optical frequency comb generating module is used for generating a pair of optical frequency combs which have orthogonal polarization, the number of comb teeth is N, and the interval difference of the comb teeth is a fixed value: a carrier optical frequency comb and a local oscillator optical frequency comb, wherein N is an integer greater than 1;
the amplitude-phase frequency regulation and control module is used for inputting a combined light signal of the carrier light frequency comb and the local oscillator light frequency comb into the light input end of a polarization division multiplexing double-balanced modulator after passing through a polarization controller, respectively inputting an intermediate frequency chirp signal and an electric control signal into the microwave input ends of two sub double-balanced modulators of the polarization division multiplexing double-balanced modulator, respectively enabling the sub double-balanced modulators input by the intermediate frequency chirp signal and the electric control signal to work in a carrier suppression double-sideband modulation state and a carrier suppression single-sideband modulation state, and enabling the light signal output by the polarization division multiplexing double-balanced modulator to pass through an analyzer; the channel processing module is used for dividing the optical signal after passing through the analyzer into N optical channels, wherein the ith optical channel comprises an ith comb tooth of the carrier optical frequency comb and an ith comb tooth of the local oscillator optical frequency comb; photoelectrically converting the N optical channels into N sub-electric chirp signals and performing delay matching; and selecting a plurality of continuous sub-electrical chirp signals from the N sub-electrical chirp signals to carry out splicing combination to obtain chirp signals with reconfigurable center frequency, bandwidth and time width.
The division of the optical signal is preferably performed by N optical filters, or programmable optical processors, with adjustable bandwidth and center frequency.
Further, the amplitude-phase frequency regulation and control module regulates and controls the parameters of the reconfigurable chirp signal by regulating at least one of three parameters of the amplitude, the phase and the center frequency of the N sub-electrical chirp signals.
Further, the phase of the N sub-electrical chirp signals is adjusted by changing a bias voltage of the polarization division multiplexing double balanced modulator, the amplitude of the N sub-electrical chirp signals is adjusted by changing an angle of polarization detection of the analyzer, and the center frequency of the N sub-electrical chirp signals is adjusted by changing the frequency of the electric control signal.
Preferably, the carrier optical frequency comb and the local oscillator optical frequency comb satisfy the following condition:
NΔf+f 0 +B＜f s
where Δ f is the difference between the comb teeth intervals, f 0 B is the initial frequency, bandwidth, f of the intermediate frequency chirp signal s The comb teeth intervals of the carrier optical frequency comb.
Compared with the prior art, the technical scheme of the invention has the following beneficial effects:
by adopting the technical scheme of the invention, the center frequency, the bandwidth and the time width of the generated chirp signal can be flexibly reconstructed in a large range, and most importantly, the center frequency, the phase and the amplitude of the generated chirp signal can be controlled in an optical domain, so that the flexibility of generating the signal is increased.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of a photon reconfigurable waveform generation apparatus of the present invention;
fig. 2 is a schematic diagram of the photon reconfigurable waveform generating device of the present invention.
Detailed Description
Aiming at the defects of the existing chirp signal generation technology, the idea of the invention is that based on the double-optical-comb technology, an electrical intermediate frequency chirp signal is expanded into a chirp signal with reconfigurable central frequency, bandwidth and time width by utilizing a multi-channel combined splicing mode, and in addition, the central frequency, the phase and the amplitude of the generated chirp signal can be controlled through an optical domain, and finally, a reconfigurable chirp signal with controllable amplitude and phase frequency is obtained.
The invention provides a photon reconfigurable waveform generation method, which comprises the following steps:
generating a pair of optical frequency combs which have orthogonal polarization and the number of comb teeth is N, and the interval difference of the comb teeth is a fixed value: a carrier optical frequency comb and a local oscillator optical frequency comb, wherein N is an integer greater than 1; the combined beam optical signal of a carrier optical frequency comb and a local oscillator optical frequency comb passes through a polarization controller and then is input into an optical input end of a polarization division multiplexing double-balanced modulator, an electrical intermediate frequency chirp signal and an electric control signal are respectively input into microwave input ends of two sub double-balanced modulators of the polarization division multiplexing double-balanced modulator, the sub double-balanced modulators input by the intermediate frequency chirp signal and the electric control signal are respectively made to work in a carrier suppression double-sideband modulation state and a carrier suppression single-sideband modulation state, and the optical signal output by the polarization division multiplexing double-balanced modulator passes through an analyzer; dividing the optical signal after passing through the analyzer into N optical channels, wherein the ith optical channel comprises an ith comb tooth of the carrier optical frequency comb and an ith comb tooth of the local oscillator optical frequency comb; photoelectrically converting the N optical channels into N sub-electric chirp signals and performing delay matching; and selecting a plurality of continuous sub-electrical chirp signals from the N sub-electrical chirp signals to carry out splicing combination to obtain chirp signals with reconfigurable center frequency, bandwidth and time width.
The invention provides a photon reconfigurable waveform generating device, which comprises:
the polarization orthogonal optical frequency comb generating module is used for generating a pair of optical frequency combs which are orthogonal in polarization, have the comb tooth number of N and have the constant value of the difference between the comb tooth intervals: a carrier optical frequency comb and a local oscillator optical frequency comb, wherein N is an integer greater than 1;
the amplitude-phase frequency regulation and control module is used for inputting a combined optical signal of the carrier optical frequency comb and the local oscillator optical frequency comb into an optical input end of a polarization division multiplexing double-balanced modulator after passing through a polarization controller, respectively inputting an intermediate frequency chirp signal and an electric control signal into microwave input ends of two sub double-balanced modulators of the polarization division multiplexing double-balanced modulator, respectively enabling the sub double-balanced modulators input by the intermediate frequency chirp signal and the electric control signal to work in a carrier suppression double-sideband modulation state and a carrier suppression single-sideband modulation state, and enabling the optical signal output by the polarization division multiplexing double-balanced modulator to pass through an analyzer; the channel processing module is used for dividing the optical signal after passing through the analyzer into N optical channels, wherein the ith optical channel comprises an ith comb tooth of the carrier optical frequency comb and an ith comb tooth of the local oscillator optical frequency comb; photoelectrically converting the N optical channels into N sub-electric chirp signals and performing delay matching; and selecting a plurality of continuous sub-electrical chirp signals from the N sub-electrical chirp signals to carry out splicing combination to obtain chirp signals with reconfigurable center frequency, bandwidth and time width.
For the public to understand, the technical solution and the principle of the present invention are explained in detail by a specific embodiment and the accompanying drawings:
as shown in fig. 1, the photon reconfigurable waveform generating apparatus of the present embodiment includes: the system comprises a polarization orthogonal optical frequency comb generation module, an amplitude-phase frequency regulation module, a channel processing module, a direct signal generator (DDS), a microwave source and a direct current power supply, wherein the DDS, the microwave source and the direct current power supply are not shown in figure 1; the polarization orthogonal optical frequency comb generating module is used for generating a pair of optical frequency combs which have orthogonal polarization and N comb teeth, and the interval difference of the comb teeth is a fixed value: a carrier optical frequency comb and a local oscillator optical frequency comb, wherein N is an integer greater than 1; the amplitude-phase frequency regulation and control module is used for inputting a combined optical signal of the carrier optical frequency comb and the local oscillator optical frequency comb into an optical input end of a polarization division multiplexing double-balanced modulator after passing through a polarization controller, respectively inputting an electrical intermediate frequency chirp signal and an electrical control signal into microwave input ends of two sub double-balanced modulators of the polarization division multiplexing double-balanced modulator, enabling the two sub double-balanced modulators to work in a carrier suppression single-sideband modulation mode, and enabling the optical signal output by the polarization division multiplexing double-balanced modulator to pass through an analyzer; the channel processing module is used for dividing the optical signal after passing through the analyzer into N optical channels, wherein the ith optical channel comprises an ith comb tooth of the carrier optical frequency comb and an ith comb tooth of the local oscillator optical frequency comb; photoelectrically converting the N optical channels into N sub-electric chirp signals and performing delay matching; and selecting a plurality of continuous sub-electrical chirp signals from the N sub-electrical chirp signals to carry out splicing combination to obtain chirp signals with reconfigurable center frequency, bandwidth and time width.
The polarization orthogonal optical frequency comb generating module can be implemented by adopting various prior arts, such as the manners disclosed by the following prior documents: the microwave photon broadband radio frequency receiving technology based on the multi-frequency optical local oscillator is researched by [ D ]. Nanjing aerospace university, 2019], [ Xichenxu ] the microwave photon channelizing technology based on the polarization modulation is researched by [ D ]. Nanjing aerospace university, 2020 ].
The amplitude-phase-frequency regulation module is realized by a polarization-division multiplexing double-balanced modulator, and in order to more flexibly reconstruct the parameters of the generated chirp signal, a polarization controller is connected in front of an optical input end of the amplitude-phase-frequency regulation module, and an analyzer is connected behind an optical output end of the amplitude-phase-frequency regulation module. As shown in fig. 1, a polarization division multiplexing double balanced modulator is composed of two sub double balanced modulators, a polarization beam splitter, a polarization beam combiner, and a polarization rotator.
In the channel processing module in this embodiment, a programmable optical processor is used to divide the optical channels, a group of tunable optical delay lines (VODLs) is used to perform the delay matching in the optical domain, and a programmable electrical processor is used to perform splicing and combining of the sub-electrical chirp signals; of course, other existing technologies may also be used to implement the delay matching, for example, the division of optical channels is implemented by N optical filters with adjustable bandwidth and center frequency, or the delay matching may also be implemented by a group of adjustable electrical delay lines.
Assuming that the initial frequency of a pair of polarization orthogonal double optical combs generated by a polarization orthogonal optical frequency comb generation module is f 1 Frequency interval of f s The optical comb is used as a carrier optical frequency comb with an initial frequency f 1 Frequency interval of f L The optical frequency comb as local oscillator optical frequency comb, the comb tooth quantity is N, and the frequency interval of carrier optical frequency comb and local oscillator optical frequency comb satisfies the relation: f. of s ＝f L + Δ f, their light field can be expressed as:
wherein a is n ，b n (N =1,2 \8230; N) is the amplitude of each frequency component.
And then the dual-optical comb with orthogonal polarization is sent to a polarization division multiplexing dual-balanced modulator after passing through a polarization controller, and the modulator consists of two sub dual-balanced modulators. The direct signal generator generates a starting frequency f 0 The chirp signal is modulated to a carrier optical frequency comb of the upper sub-double-balanced modulator, and the carrier optical frequency comb works in a carrier suppression double-sideband state by adjusting the bias voltage, wherein an output optical field of the upper sub-double-balanced modulator can be represented as follows:
wherein c is n For the amplitude of the respective frequency component,
is the phase difference of two side bands, the value of which is related to the bias voltage, and the relation is satisfied:
V bias and V π Respectively, the bias voltage and the half-wave voltage of the upper sub-modulator.
The local oscillator optical frequency comb is sent to a sub-double-balanced modulator of a lower path and then is modulated by an electric control signal emitted by a microwave source, a bias voltage is modulated to enable the modulator to work in a carrier suppression single-sideband state, and an output optical field of the sub-double-balanced modulator of the lower path can be represented as follows:
wherein d is n For the amplitude of the respective frequency component, f cs The frequency of the electrical control signal. When the symbol is "+" it means that only positive first order sidebands are retained, and when the symbol is "-" it means that only negative first order sidebands are retained.
The modulated optical signal is orthogonal in polarization, and then enters the analyzer to be converted into linearly polarized light, the analyzer used in this embodiment is composed of a polarization controller and a polarization beam splitter, by adjusting the polarization controller, the mutually perpendicular polarized light can be converted into linearly polarized light, and the optical signal output by the analyzer can be expressed as:
E out ＝cosαE upper +sinαE lower (4)
where α is the analyzer angle of the analyzer.
The optical signal after polarization detection is sent to a programmable optical processor, one sideband of a signal optical frequency comb is filtered, a signal component corresponding to each channel is filtered to obtain 1,2, \ 8230, and optical fields of N channels are respectively as follows:
each channel is subjected to delay matching through an adjustable light delay line, wherein 1,2, \8230iscarried out, and delay amounts corresponding to N channels are respectively T 1 ，T 2 …T N The delayed optical field of each channel can be expressed as:
after the time delay matching, the optical signal is sent to the photoelectric detection array and converted into an electric chirp signal, wherein the expression of the electric chirp signal is as follows:
as can be seen from the above equation, a plurality of sub-chirp signals are generated using the double optical comb, the center frequency of the chirp signal can be changed by selecting different channels, the phase of each channel can be changed by changing the bias voltage of the add-on sub-modulator, the amplitude of each channel can be changed by changing the angle of the analyzer, and the center frequency of the chirp signal can also be changed by changing the frequency of the electric control signal. Then the sub-chirp signals are spliced and combined by the programmable electrical processor to obtain a chirp signal with any reconfigurable center frequency, bandwidth and time width, and the combined chirp signal can be expressed as:
through splicing and combining of the sub-channels, the bandwidth and time width of the chirp signal finally generated are greatly expanded, the center frequency can be edited at will, and the phase, amplitude and center frequency of the generated chirp signal can be adjusted in the optical domain. Fig. 2 shows a spectrum/frequency spectrum diagram of each process of the present embodiment.
In order to prevent the signal optical frequency comb and the local oscillator optical frequency comb from overlapping, the following relation is required to be satisfied:
NΔf+f 0 +B＜f s (9)
if Δ f = B, the chirp signal after splicing will be continuous, and channel 1,2 \8230nis selected, N splicing will result in a large time-width chirp signal with a bandwidth of N × B and a time width of N × τ. If channel M, M +1, \ 8230n (M is the first channel of the splice, M < N) splice is selected, a reconfigurable chirp signal with a bandwidth of (N-M + 1) × B and a time width of (N-M + 1) × τ will result. If Δ f ≠ B, the chirp signals after splicing may overlap, which affects the quality of the generated chirp signals, and such a situation should be avoided as much as possible.
Claims (10)
1. A photon reconfigurable waveform generation method is characterized by generating a pair of optical frequency combs which have orthogonal polarization and have N comb teeth, wherein the difference between the intervals of the comb teeth is a fixed value: a carrier optical frequency comb and a local oscillator optical frequency comb, wherein N is an integer greater than 1; the combined beam optical signal of a carrier optical frequency comb and a local oscillator optical frequency comb passes through a polarization controller and then is input into an optical input end of a polarization division multiplexing double-balanced modulator, an intermediate frequency electric chirp signal and an electric control signal are respectively input into microwave input ends of two sub double-balanced modulators of the polarization division multiplexing double-balanced modulator, the sub double-balanced modulators input by the intermediate frequency electric chirp signal and the electric control signal are respectively made to work in a carrier suppression double-sideband modulation state and a carrier suppression single-sideband modulation state, and the optical signal output by the polarization division multiplexing double-balanced modulator passes through an analyzer; dividing the optical signal after passing through the analyzer into N optical channels, wherein the ith optical channel comprises an ith comb tooth of the carrier optical frequency comb and an ith comb tooth of the local oscillator optical frequency comb; photoelectrically converting the N optical channels into N sub-electric chirp signals and performing delay matching; and selecting a plurality of continuous sub-electrical chirp signals from the N sub-electrical chirp signals to carry out splicing combination to obtain chirp signals with reconfigurable center frequency, bandwidth and time width.
2. The method of generating a photonic reconfigurable waveform of claim 1, wherein the division of the optical signal is performed by N optical filters, or programmable optical processors, with adjustable bandwidths and center frequencies.
3. The method of photonic reconfigurable waveform generation of claim 1, further comprising: and adjusting and controlling the parameters of the reconfigurable chirp signal by adjusting at least one of the three parameters of the amplitude, the phase and the center frequency of the N sub-electrical chirp signals.
4. The photon reconfigurable waveform generating method as claimed in claim 3, wherein the phases of the N sub-electrical chirp signals are adjusted by changing a bias voltage of the polarization division multiplexing double balanced modulator, the amplitudes of the N sub-electrical chirp signals are adjusted by changing an analysis angle of the analyzer, and the center frequencies of the N sub-electrical chirp signals are adjusted by changing the frequency of the electrical control signal.
5. The method for generating a photonic reconfigurable waveform according to claim 1, wherein the carrier optical frequency comb and the local oscillator optical frequency comb satisfy the following condition:
NΔf+f 0 +B＜f s
where Δ f is the difference between the comb teeth intervals, f 0 B is the initial frequency, bandwidth, f of the intermediate frequency electric chirp signal s The comb teeth intervals of the carrier optical frequency comb.
6. A photonic reconfigurable waveform generation apparatus, comprising:
the polarization orthogonal optical frequency comb generating module is used for generating a pair of optical frequency combs which have orthogonal polarization, the number of comb teeth is N, and the interval difference of the comb teeth is a fixed value: the device comprises a carrier optical frequency comb and a local oscillator optical frequency comb, wherein N is an integer greater than 1;
the amplitude-phase frequency regulation and control module is used for inputting a combined optical signal of the carrier optical frequency comb and the local oscillator optical frequency comb into an optical input end of a polarization division multiplexing double-balanced modulator after passing through a polarization controller, respectively inputting an intermediate frequency electric chirp signal and an electric control signal into microwave input ends of two sub double-balanced modulators of the polarization division multiplexing double-balanced modulator, respectively enabling the sub double-balanced modulators input by the intermediate frequency electric chirp signal and the electric control signal to work in a carrier suppression double-sideband modulation state and a carrier suppression single-sideband modulation state, and enabling an optical signal output by the polarization division multiplexing double-balanced modulator to pass through an analyzer;
the channel processing module is used for dividing the optical signal after passing through the analyzer into N optical channels, wherein the ith optical channel comprises the ith comb tooth of the carrier optical frequency comb and the ith comb tooth of the local oscillator optical frequency comb; photoelectrically converting the N optical channels into N sub-electric chirp signals and performing delay matching; and selecting a plurality of continuous sub-electrical chirp signals from the N sub-electrical chirp signals to carry out splicing combination to obtain a chirp signal with reconfigurable center frequency, bandwidth and time width.
7. The photonic reconfigurable waveform generating device as claimed in claim 6, wherein the division of the optical signal is performed by N optical filters, or programmable optical processors, whose bandwidths and center frequencies are adjustable.
8. The photon reconfigurable waveform generating apparatus according to claim 6, wherein the amplitude-phase modulation module modulates the parameters of the reconfigurable chirp signal by adjusting at least one of three parameters of amplitude, phase and center frequency of the N sub-electrical chirp signals.
9. The photonic reconfigurable waveform generating apparatus as claimed in claim 8, wherein the N sub-electrical chirp signals are adjusted in phase by changing a bias voltage of the polarization division multiplexing double balanced modulator, adjusted in amplitude by changing an angle of analysis of the analyzer, and adjusted in center frequency by changing a frequency of the electric control signal.
10. The photonic reconfigurable waveform generating apparatus according to claim 6, wherein the carrier optical frequency comb and the local oscillator optical frequency comb satisfy the following condition:
NΔf+f 0 +B＜f s
where Δ f is the difference between the comb teeth intervals, f 0 B is the initial frequency, bandwidth, f of the intermediate frequency electric chirp signal s The comb teeth intervals of the carrier optical frequency comb.
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