Microwave generation method and device, microwave generator and storage medium

Abstract

The application discloses a microwave generation method and device, a microwave generator and a storage medium. The method comprises the following steps: acquiring an optical signal output by an adjustable laser and inputting the optical signal to a preset modulator through a polarization controller; loading a driving signal on the preset modulator and adjusting the power size, and outputting first positive and negative second-order sidebands and second positive and negative second-order sidebands; inputting the first positive and negative second-order sidebands and the second positive and negative second-order sidebands into a polarization maintaining Bragg grating through a circulator, making the sidebands orthogonal to each other through a band-stop filter, and obtaining the first positive and negative second-order sidebands and the second positive and negative second-order sidebands after the orthogonalization; respectively performing modulation processing on the sidebands after the orthogonalization, and obtaining a target signal; and performing spread spectrum on the target signal, and generating a microwave signal. The application acquires two pairs of sidebands through an optical signal and performs modulation, generates a microwave signal after spread spectrum on the target signal obtained, solves the problem of a small adjustable frequency range, and generates an arbitrary waveform phase microwave signal with a large adjustable frequency range and low noise.

Description

Technical Field

[0001] This invention relates to the field of microwave generation technology, and in particular to a microwave generation method, apparatus, microwave generator, and storage medium. Background Technology

[0002] Modern pulse radar systems place increasingly higher demands on radar detection range, resolution, and accuracy. While ensuring optimal detection performance and a high signal-to-noise ratio, radar measurement accuracy and range depend on the spectral structure of the measurement signal, while velocity measurement accuracy and resolution depend on the signal's temporal structure. Therefore, microwave pulse signals with large time-bandwidth products have been widely researched and applied. To obtain microwave pulse signals with large time-bandwidth products, a phase-coded modulation signal is typically generated at the radar transmitter, and then the pulse is compressed at the radar receiver using a matched filter to improve the compression ratio and enhance radar detection resolution. However, methods using traditional electronic techniques to generate phase-coded signals suffer from limitations such as device bandwidth, severe electromagnetic interference, and a small frequency adjustable range, making them unsuitable for the future development requirements of high precision and high sensitivity in radar systems. Summary of the Invention

[0003] The main objective of this invention is to provide a microwave generation method, apparatus, microwave generator, and storage medium, aiming to solve the technical problems of bandwidth limitation, severe electromagnetic interference, and small frequency adjustable range in existing devices.

[0004] To achieve the above objectives, the present invention provides a microwave generation method, which is applied to a microwave generator, the microwave generator including a tunable laser, a polarization controller, a preset modulator, a circulator, and a polarization-maintaining Bragg grating, and the method includes the following steps:

[0005] Acquire the optical signal output from the tunable laser, and input the optical signal to the preset modulator through the polarization controller;

[0006] A drive signal is applied to the preset modulator, and the power of the drive signal is adjusted so that the preset modulator outputs a first positive and negative second-order sideband and a second positive and negative second-order sideband.

[0007] The first and second positive and negative second-order sidebands are input into the polarization-maintaining Bragg grating via the circulator. The first and second positive and negative second-order sidebands are made orthogonal to each other by the band-stop filter of the polarization-maintaining Bragg grating, resulting in orthogonal first and second positive and negative second-order sidebands. The positive and negative sidebands in the first positive and negative second-order sidebands are orthogonal to each other, and the positive and negative sidebands in the second positive and negative second-order sidebands are orthogonal to each other.

[0008] The first and second positive and negative second-order sidebands after orthogonalization are modulated respectively to obtain the target signal;

[0009] The target signal is spread to generate a microwave signal.

[0010] Optionally, the preset modulator includes two sub-modulators and one main modulator, wherein the two sub-modulators are an upper arm modulator and a lower arm modulator, respectively. The step of acquiring the optical signal output from the tunable laser and inputting the optical signal to the preset modulator via a polarization controller includes:

[0011] The optical signal is split into two optical signals by the polarization controller;

[0012] One of the two optical signals is input to the upper arm modulator of the preset modulator, and the other of the two optical signals is input to the lower arm modulator of the preset modulator.

[0013] Optionally, after inputting one of the two optical signals to the upper arm modulator of the preset modulator and inputting the other of the two optical signals to the lower arm modulator of the preset modulator, the method further includes:

[0014] The initial DC bias voltage generated by the polarization controller is input into the preset modulator;

[0015] Adjust the initial DC bias voltage until the current DC bias voltage, the current operating voltage of the sub-modulator, and the current operating voltage of the main modulator are consistent and reach a preset value, then stop adjusting so that both sub-modulators and the main modulator of the preset modulator are operating at the maximum transmission point.

[0016] Optionally, the target signal includes a first target signal, a second target signal, and a third target signal. The step of modulating the orthogonalized first and second positive and negative second-order sidebands to obtain the target signal includes:

[0017] The orthogonal first positive and negative second-order sidebands are reflected by a mirror and then input into the first polarization beam splitter.

[0018] After the first positive and negative second-order sidebands are separated by the first polarization beam splitter, the positive sideband and the negative sideband are obtained.

[0019] The positive sideband is input to the first phase modulator for modulation to obtain the first target signal;

[0020] The negative sideband is input to a second phase modulator for modulation to obtain a second target signal;

[0021] The orthogonal second positive and negative second-order sidebands are directly transmitted to obtain the third target signal.

[0022] Optionally, the microwave signal includes a first microwave signal and a second microwave signal, and the step of spreading the target signal to generate the microwave signal includes:

[0023] The first target signal, the second target signal, and the third target signal are combined through a coupler and then input to the second polarization beam splitter.

[0024] The combined target signal is separated by the second polarization beam splitter to obtain the first optical signal and the second optical signal;

[0025] The first optical signal is input to the first photodetector for beat frequency generation to generate the first microwave signal;

[0026] The second optical signal is input to the second photodetector for beat frequency generation to generate the second microwave signal.

[0027] Optionally, the driving signal includes an upper arm driving signal and a lower arm driving signal. Before adjusting the power of the driving signal to make the preset modulator output the first positive and negative second-order sidebands and the second positive and negative second-order sidebands, the method further includes:

[0028] The optical signal entering the upper arm modulator is modulated by the upper arm drive signal;

[0029] The optical signal entering the lower arm modulator is modulated by the lower arm drive signal.

[0030] Optionally, the step of loading a drive signal onto the preset modulator and adjusting the power of the drive signal to cause the preset modulator to output a first positive and negative second-order sideband and a second positive and negative second-order sideband includes:

[0031] Adjust the power of the upper arm drive signal so that the upper arm modulator outputs the first positive and negative second-order sidebands;

[0032] Adjust the power of the lower arm drive signal so that the lower arm modulator outputs a second positive and negative second-order sideband.

[0033] Furthermore, to achieve the above objectives, the present invention also proposes a microwave generating apparatus, the microwave generating apparatus comprising:

[0034] The signal input module is used to acquire the optical signal output by the tunable laser and input the optical signal to the preset modulator through the polarization controller.

[0035] A sideband output module is used to load a drive signal onto the preset modulator, and by adjusting the power of the drive signal, the preset modulator outputs a first positive and negative second-order sideband and a second positive and negative second-order sideband.

[0036] The sideband orthogonal module is used to input the first positive and negative second-order sidebands and the second positive and negative second-order sidebands into the polarization-maintaining Bragg grating via the circulator, and make the first positive and negative second-order sidebands and the second positive and negative second-order sidebands orthogonal to each other through the band-stop filter of the polarization-maintaining Bragg grating, so as to obtain the orthogonal first positive and negative second-order sidebands and the second positive and negative second-order sidebands.

[0037] The sideband modulation module is used to modulate the orthogonal first positive and negative second-order sidebands and the second positive and negative second-order sidebands respectively to obtain the target signal.

[0038] A microwave signal generation module is used to spread the target signal to generate a microwave signal.

[0039] Furthermore, to achieve the above objectives, the present invention also proposes a microwave generator, which includes: a memory, a processor, and a microwave generation program stored in the memory and executable on the processor, the microwave generation program being configured to implement the steps of the microwave generation method described above.

[0040] Furthermore, to achieve the above objectives, the present invention also proposes a storage medium storing a microwave generation program, which, when executed by a processor, implements the steps of the microwave generation method as described above.

[0041] This invention obtains two pairs of positive and negative second-order sidebands through optical signals, modulates the two pairs of positive and negative second-order sidebands to obtain a target signal, spreads the target signal to generate a microwave signal, and solves the problems of device bandwidth limitation, severe electromagnetic interference, and small frequency adjustable range, thereby generating arbitrary waveform phase microwave signals with a wide frequency adjustable range, high coding rate, and low noise. Attached Figure Description

[0042] Figure 1 This is a schematic diagram of the structure of a microwave generator in the hardware operating environment involved in the embodiments of the present invention;

[0043] Figure 2 This is a schematic flowchart of the first embodiment of the microwave generation method of the present invention;

[0044] Figure 3 This is a schematic flowchart of the second embodiment of the microwave generation method of the present invention;

[0045] Figure 4 This is a schematic flowchart of the third embodiment of the microwave generation method of the present invention;

[0046] Figure 5 This is a structural block diagram of the first embodiment of the microwave generating device of the present invention.

[0047] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0048] It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the invention.

[0049] Reference Figure 1 , Figure 1 This is a schematic diagram of the microwave generator structure of the hardware operating environment involved in the embodiments of the present invention.

[0050] like Figure 1 As shown, the microwave generator may include: a processor 1001, such as a central processing unit (CPU), a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005. The communication bus 1002 is used to enable communication between these components. The user interface 1003 may include a display screen and an input unit such as a keyboard; optionally, the user interface 1003 may also include a standard wired interface or a wireless interface. The network interface 1004 may optionally include a standard wired interface or a wireless interface (such as a Wireless-Fidelity (Wi-Fi) interface). The memory 1005 may be high-speed random access memory (RAM) or stable non-volatile memory (NVM), such as a disk storage device. Optionally, the memory 1005 may also be a storage device independent of the aforementioned processor 1001.

[0051] Those skilled in the art will understand that Figure 1 The structure shown does not constitute a limitation on the microwave generator and may include more or fewer components than shown, or combine certain components, or have different component arrangements.

[0052] like Figure 1 As shown, the memory 1005, which serves as a storage medium, may include an operating system, a network communication module, a user interface module, and a microwave generation program.

[0053] exist Figure 1In the microwave generator shown, the network interface 1004 is mainly used for data communication with the network server; the user interface 1003 is mainly used for data interaction with the user; the processor 1001 and the memory 1005 in the microwave generator of the present invention can be set in the microwave generator, and the microwave generator calls the microwave generation program stored in the memory 1005 through the processor 1001 and executes the microwave generation method provided in the embodiment of the present invention.

[0054] This invention provides a microwave generation method applied to a microwave generator, which includes a tunable laser, a polarization controller, a preset modulator, a circulator, and a polarization-maintaining Bragg grating. (Refer to...) Figure 2 , Figure 2 This is a schematic flowchart of the first embodiment of the microwave generation method of the present invention.

[0055] In this embodiment, the microwave generation method includes the following steps:

[0056] Step S10: Obtain the optical signal output by the tunable laser, and input the optical signal to the preset modulator through the polarization controller.

[0057] It should be noted that tunable lasers generally refer to tunable lasers, which are lasers whose output wavelength can be continuously changed within a certain range (see laser). Compared with other traditional solid-state lasers, tunable lasers have a wide tuning range from near-ultraviolet to near-infrared, and they are small in size, narrow in linewidth, and have high optical efficiency. The principles for achieving laser wavelength tuning include: changing the wavelength of the laser by changing the wavelength corresponding to the low-loss region of the resonant cavity through certain components (such as gratings); shifting the energy level of the laser transition by changing certain external parameters (such as magnetic field, temperature, etc.); and using nonlinear effects to achieve wavelength transformation and tuning (see nonlinear optics, stimulated Raman scattering, optical frequency second harmonics, optical parametric oscillation).

[0058] It is understood that the polarization controller is an optical polarization controller, which is used to polarize optical signals to obtain optical signals with a target polarization angle. When polarized light is transmitted in a medium with birefringence, due to the different transmission speeds, one ray of light is delayed relative to another ray of light, thereby causing a change in the polarization state of the light.

[0059] It is worth noting that a modulator is a device that uses digital signal processing technology to modulate low-frequency digital signals (such as audio, video, and data) onto high-frequency digital signals for signal transmission. Modulators are widely used in the transmission of information such as broadcasting (audio signals) and television (video signals). Modulators are generally used in pairs with demodulators. The modulator is used to process digital signals onto high-frequency signals for transmission, while the demodulator restores the digital signals to the original signals. The preset modulator can be a Mach-Zehnder modulator, which is used to input two equal signals into the two optical branches of the modulator respectively.

[0060] Step S20: Apply a driving signal to the preset modulator, and adjust the power of the driving signal to make the preset modulator output a first positive and negative second-order sideband and a second positive and negative second-order sideband.

[0061] It should be noted that sidebands refer to the frequency bands generated above and below the center carrier frequency after modulation. The bandwidth of the sidebands is determined by the bandwidth of the modulating signal and the modulation method. Sidebands are divided into single sidebands and double sidebands. Double sidebands are normal amplitude modulation signals. In the spectrum, the two envelopes closer to zero are the lower sidebands, and the ones farther away are the upper sidebands.

[0062] It is understood that the driving signal is a sinusoidal microwave driving signal output by a sinusoidal signal generator, and the frequency of the driving signal can be 5GHz, 10GHz, etc. This embodiment does not impose specific limitations on this.

[0063] Step S30: Input the first positive and negative second-order sidebands and the second positive and negative second-order sidebands into the polarization-maintaining Bragg grating via the circulator, and make the first positive and negative second-order sidebands and the second positive and negative second-order sidebands orthogonal to each other through the band-stop filter of the polarization-maintaining Bragg grating, so as to obtain the orthogonal first positive and negative second-order sidebands and the second positive and negative second-order sidebands.

[0064] It should be noted that the first positive and negative second-order sidebands include positive sidebands and negative sidebands, and the positive and negative sidebands in the first positive and negative second-order sidebands are orthogonal to each other. The second positive and negative second-order sidebands include positive sidebands and negative sidebands, and the positive and negative sidebands in the second positive and negative second-order sidebands are orthogonal to each other.

[0065] It is worth noting that a circulator, also called an isolator, is a non-reversible device with multiple terminals. It directs the incident wave entering any of its terminals to the next terminal in a direction determined by a static deflection magnetic field. Its significant feature is that it can transmit high-frequency signal energy in one direction. It controls the transmission of electromagnetic waves along a certain circumferential direction. This characteristic of transmitting high-frequency signal energy in one direction is often used between the output terminal of a high-frequency power amplifier and the load, so as to play the role of independent and mutually isolated functions.

[0066] It is understood that the polarization-maintaining Bragg grating refers to a fiber Bragg grating that uses polarization-maintaining fiber. It is a diffraction grating formed by axially periodically modulating the refractive index of the fiber core through a certain method, and is a passive filter device.

[0067] Step S40: Modulate the first positive and negative second-order sidebands and the second positive and negative second-order sidebands after orthogonalization to obtain the target signal.

[0068] It should be noted that modulation is a process of converting a signal generated by a source into a form suitable for wireless transmission. It samples and quantizes an analog signal, modulates the optical carrier with binary digital signals "1" or "0", and performs pulse coding. The advantages of digital modulation are strong anti-interference ability and no accumulation of noise and dispersion during relay, thus enabling long-distance transmission.

[0069] Step S50: Spread the target signal to generate a microwave signal.

[0070] It should be noted that spread spectrum is a technique that expands a narrow spectrum (low chip rate) into a wide spectrum (high chip rate), spreading the spectrum of the transmitted signal to a wider bandwidth than its original bandwidth. It is commonly used in the field of wireless communication. After spread spectrum modulation, the signal transmission bandwidth should be much larger than the original signal. The transmitting end will use a unique code, which is independent of the transmitted data. The receiving end must also use this unique code to despread the signal and obtain the data from the transmitting end.

[0071] This embodiment obtains two pairs of positive and negative second-order sidebands through optical signals, modulates the two pairs of positive and negative second-order sidebands to obtain the target signal, spreads the target signal to generate a microwave signal, solves the problems of device bandwidth limitation, severe electromagnetic interference, and small frequency adjustable range, and generates an arbitrary waveform phase microwave signal with a wide frequency adjustable range, high coding rate, and low noise.

[0072] refer to Figure 3 , Figure 3 This is a schematic flowchart of the second embodiment of the microwave generation method of the present invention.

[0073] Based on the first embodiment described above, the preset modulator in the microwave generation method of this embodiment includes two sub-modulators and one main modulator. The two sub-modulators are an upper arm modulator and a lower arm modulator, respectively. Step S10 includes:

[0074] Step S101: The optical signal is split into two optical signals by the polarization controller.

[0075] Understandably, the optical signal output from the tunable laser is polarized by the polarization controller and split into two optical signals with the target polarization angle, which then enter the two optical branches of the Mach-Zehnder modulator, namely the upper arm and the lower arm.

[0076] Step S102: Input one of the two optical signals to the upper arm modulator of the preset modulator, and input the other of the two optical signals to the lower arm modulator of the preset modulator.

[0077] It should be noted that the preset modulator includes two sub-modulators and one main modulator, and the two sub-modulators are the upper arm modulator and the lower arm modulator, respectively.

[0078] Furthermore, in order to operate at the maximum transmission point, after step S102, the method further includes: inputting the initial DC bias voltage generated by the polarization controller into the preset modulator; adjusting the initial DC bias voltage until the current DC bias voltage, the current operating voltage of the sub-modulator, and the current operating voltage of the main modulator are consistent and reach a preset value, and then stopping the adjustment, so that both sub-modulators and the main modulator of the preset modulator operate at the maximum transmission point.

[0079] It should be noted that DC bias voltage refers to the voltage that should be set between the base and emitter and between the collector and base when the transistor is in amplification mode in a transistor amplifier circuit.

[0080] It is understandable that by adjusting the initial DC bias voltage, both sub-modulators and the main modulator of the preset modulator are made to operate at the maximum transmission point, thereby maximizing the power of the driving signal and suppressing the odd-order sidebands of the optical signal.

[0081] Furthermore, the driving signal includes an upper arm driving signal and a lower arm driving signal. Before adjusting the power of the driving signal to make the preset modulator output the first positive and negative second-order sidebands and the second positive and negative second-order sidebands, the method further includes: modulating the optical signal entering the upper arm modulator with the upper arm driving signal; and modulating the optical signal entering the lower arm modulator with the lower arm driving signal.

[0082] It is understood that a driving signal is loaded onto a preset modulator, wherein the upper arm driving signal in the driving signal modulates the optical signal entering the upper arm modulator, and the lower arm driving signal in the driving signal modulates the optical signal entering the lower arm modulator. By adjusting the power of the driving signal, a first positive and negative second-order sideband and a second positive and negative second-order sideband are obtained.

[0083] Furthermore, the step of loading a drive signal onto the preset modulator and adjusting the power of the drive signal to make the preset modulator output a first positive and negative second-order sideband and a second positive and negative second-order sideband includes: adjusting the power of the upper arm drive signal to make the upper arm modulator output the first positive and negative second-order sideband; and adjusting the power of the lower arm drive signal to make the lower arm modulator output the second positive and negative second-order sideband.

[0084] It is understood that the upper arm modulator of the preset modulator outputs the first positive and negative second-order sidebands, and the lower arm modulator outputs the second positive and negative second-order sidebands. This embodiment does not impose specific limitations on this.

[0085] This embodiment splits the optical signal into two paths, which enter two sub-modulators of a preset modulator respectively. A driving signal is applied to modulate the optical signal entering the two sub-modulators respectively. By adjusting the power of the driving signal, a first positive and negative second-order sideband and a second positive and negative second-order sideband are obtained. This is not limited by the device bandwidth and avoids electromagnetic interference, thus improving stability.

[0086] refer to Figure 4 , Figure 4 This is a schematic flowchart of the third embodiment of the microwave generation method of the present invention.

[0087] Based on the first embodiment described above, the target signal in the microwave generation method of this embodiment includes a first target signal, a second target signal, and a third target signal. Step S40 includes:

[0088] Step S401: The first positive and negative second-order sidebands after orthogonalization are reflected by a mirror and then input into the first polarization beam splitter.

[0089] It should be noted that a reflector is an optical element that works using the law of reflection. The direction of microwave injection can be controlled by controlling the rotation angle of the reflector surface.

[0090] It is worth noting that the polarization beam splitter splits the incident light into two beams, with the outgoing light having two directions: one beam vibrating perpendicular to the incident surface and the other vibrating parallel to the incident surface. This is used to split the incident unpolarized light into two beams of polarized light with orthogonal polarization states, and the directions of the two outgoing polarized light beams are parallel to the incident light.

[0091] Step S402: After separating the first positive and negative second-order sidebands by the first polarization beam splitter, positive sidebands and negative sidebands are obtained.

[0092] Understandably, the polarization beam splitter separates the first positive and negative second-order sidebands into mutually orthogonal positive and negative sidebands.

[0093] Step S403: Input the positive sideband to the first phase modulator for modulation to obtain the first target signal.

[0094] Step S404: Input the negative sideband to the second phase modulator for modulation to obtain the second target signal.

[0095] It should be noted that a phase modulator is an optical modulator that changes the phase of light according to a certain rule, and can control the phase of a laser beam.

[0096] It is understandable that by using two phase modulators to modulate the positive and negative sidebands respectively, the phases of the positive and negative sidebands are controlled to obtain the target signal with the desired phase.

[0097] Step S405: Directly transmit the orthogonalized second positive and negative second-order sidebands to obtain the third target signal.

[0098] It should be noted that when light is incident on the surface of a transparent or translucent material, part of it is reflected, part is absorbed, and part can be transmitted. Transmission is the phenomenon of incident light exiting after passing through an object through refraction. The object through which light is transmitted is a transparent or translucent body, such as glass or color filters.

[0099] It is understandable that three different target signals can be obtained based on the first positive and negative second-order sidebands and the second positive and negative second-order sidebands. After combining the three different target signals, they can be beat separately to generate microwave signals.

[0100] Furthermore, in order to generate a microwave signal, the microwave signal includes a first microwave signal and a second microwave signal. The step of spreading the target signal to generate the microwave signal includes: combining the first target signal, the second target signal, and the third target signal through a coupler and then inputting them to a second polarization beamsplitter; separating the combined target signal through the second polarization beamsplitter to obtain a first optical signal and a second optical signal; inputting the first optical signal to a first photodetector for beat frequency generation to generate a first microwave signal; and inputting the second optical signal to a second photodetector for beat frequency generation to generate a second microwave signal.

[0101] It should be noted that the coupler is an optical fiber coupler, also known as a splitter, connector, adapter, or optical fiber flange. It is a component used to split or combine optical signals or to extend optical fiber links. The coupler combines three signals, namely the first target signal, the second target signal, and the third target signal, to obtain the combined target signal.

[0102] It should be noted that photodetectors mainly utilize electronic technology to detect optical signals and further transmit, store, control, calculate, and display them.

[0103] It is understandable that the combined target signal is input into a polarization beam splitter for separation, and the combined target signal is divided into two optical signals, namely the first optical signal and the second optical signal.

[0104] It is worth noting that the beat frequency refers to the optical beat frequency wave formed by two beams of light with similar frequencies propagating in the same direction and along the same line, and the frequency of its intensity envelope (optical beat frequency) is the frequency difference between the two beams of light.

[0105] This embodiment combines three target signals and then separates them. The resulting optical signals are then beat-frequencyd to generate two microwave signals with arbitrary waveforms. The frequency is adjustable over a wide range and the coding rate is high.

[0106] Reference Figure 5 , Figure 5 This is a structural block diagram of the first embodiment of the microwave generating device of the present invention.

[0107] like Figure 5 As shown, the microwave generating apparatus proposed in this embodiment of the invention includes:

[0108] Signal input module 10 is used to acquire the optical signal output by the tunable laser and input the optical signal to the preset modulator through the polarization controller;

[0109] Sideband output module 20 is used to load a drive signal onto the preset modulator and adjust the power of the drive signal to make the preset modulator output a first positive and negative second-order sideband and a second positive and negative second-order sideband.

[0110] The sideband orthogonal module 30 is used to input the first positive and negative second-order sidebands and the second positive and negative second-order sidebands into the polarization-maintaining Bragg grating via the circulator, and make the first positive and negative second-order sidebands and the second positive and negative second-order sidebands orthogonal to each other through the band-stop filter of the polarization-maintaining Bragg grating, so as to obtain the orthogonal first positive and negative second-order sidebands and the second positive and negative second-order sidebands. The positive and negative sidebands in the first positive and negative second-order sidebands are orthogonal to each other, and the positive and negative sidebands in the second positive and negative second-order sidebands are orthogonal to each other.

[0111] The sideband modulation module 40 is used to modulate the orthogonal first positive and negative second-order sidebands and the second positive and negative second-order sidebands respectively to obtain the target signal.

[0112] The microwave signal generation module 50 is used to spread the target signal to generate a microwave signal.

[0113] In one embodiment, the signal input module 10 is further configured to split the optical signal into two optical signals by the polarization controller; input one of the two optical signals to the upper arm modulator of the preset modulator, and input the other of the two optical signals to the lower arm modulator of the preset modulator.

[0114] In one embodiment, the sideband modulation module 40 is further configured to: reflect the orthogonalized first positive and negative second-order sidebands through a mirror and input them to a first polarization beamsplitter; separate the first positive and negative second-order sidebands through the first polarization beamsplitter to obtain a positive sideband and a negative sideband; input the positive sideband to a first phase modulator for modulation to obtain a first target signal; input the negative sideband to a second phase modulator for modulation to obtain a second target signal; and directly transmit the orthogonalized second positive and negative second-order sidebands to obtain a third target signal.

[0115] In one embodiment, the sideband modulation module 40 is further configured to combine the first target signal, the second target signal, and the third target signal through a coupler and then input them to a second polarization beamsplitter; separate the combined target signals through the second polarization beamsplitter to obtain a first optical signal and a second optical signal; input the first optical signal to a first photodetector for beat frequency generation to generate a first microwave signal; and input the second optical signal to a second photodetector for beat frequency generation to generate a second microwave signal.

[0116] Furthermore, to achieve the above objectives, the present invention also proposes a microwave generator, which includes: a memory, a processor, and a microwave generation program stored in the memory and executable on the processor, the microwave generation program being configured to implement the steps of the microwave generation method described above.

[0117] Since this microwave generator adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be repeated here.

[0118] Furthermore, this embodiment of the invention also proposes a storage medium storing a microwave generation program, which, when executed by a processor, implements the steps of the microwave generation method described above.

[0119] Since this storage medium adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be repeated here.

[0120] It should be understood that the above are merely illustrative examples and do not constitute any limitation on the technical solutions of the present invention. In specific applications, those skilled in the art can make settings as needed, and the present invention does not impose any restrictions on this.

[0121] It should be noted that the workflow described above is merely illustrative and does not limit the scope of protection of this invention. In practical applications, those skilled in the art can select some or all of the workflow to achieve the purpose of this embodiment according to actual needs, and no restrictions are imposed here.

[0122] In addition, for technical details not described in detail in this embodiment, please refer to the microwave generation method provided in any embodiment of the present invention, which will not be repeated here.

[0123] Furthermore, it should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or system. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or system that includes that element.

[0124] The sequence numbers of the above embodiments of the present invention are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0125] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as read-only memory (ROM) / RAM, magnetic disk, optical disk) and includes several instructions to cause a terminal device (which may be a mobile phone, computer, server, or network device, etc.) to execute the methods described in the various embodiments of the present invention.

[0126] The above are merely preferred embodiments of the present invention and do not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A method of microwave generation, characterized by, The method is applied to a microwave generator, and the microwave generator comprises an adjustable laser, a polarization controller, a preset modulator, a circulator and a polarization maintaining Bragg grating, and the method comprises the following steps: An optical signal output by the adjustable laser is acquired, and the optical signal is input to the preset modulator through the polarization controller; A driving signal is loaded on the preset modulator, and the power of the driving signal is adjusted so that the preset modulator outputs first positive and negative second-order sidebands and second positive and negative second-order sidebands; The first positive and negative second-order sidebands and the second positive and negative second-order sidebands are input to the polarization maintaining Bragg grating through the circulator, and the first positive and negative second-order sidebands and the second positive and negative second-order sidebands are made to be orthogonal to each other by a band-stop filter of the polarization maintaining Bragg grating, so that the first positive and negative second-order sidebands and the second positive and negative second-order sidebands after orthogonalization are obtained, wherein the positive sideband and the negative sideband in the first positive and negative second-order sidebands are orthogonal to each other, and the positive sideband and the negative sideband in the second positive and negative second-order sidebands are orthogonal to each other; The first positive and negative second-order sidebands after orthogonalization are reflected by a mirror and then input to a first polarization beam splitter; After the first positive and negative second-order sidebands are separated by the first polarization beam splitter, a positive sideband and a negative sideband are obtained; The positive sideband is input to a first phase modulator for modulation, so that a first target signal is obtained; The negative sideband is input to a second phase modulator for modulation, so that a second target signal is obtained; The second positive and negative second-order sidebands after orthogonalization are directly transmitted, so that a third target signal is obtained; The first target signal, the second target signal and the third target signal are combined by a coupler and then input to a second polarization beam splitter; The combined target signal is separated by the second polarization beam splitter, so that a first optical signal and a second optical signal are obtained; The first optical signal is input to a first photodetector for frequency mixing, so that a first microwave signal is generated; The second optical signal is input to a second photodetector for frequency mixing, so that a second microwave signal is generated.

2. The method of claim 1, wherein, The preset modulator comprises two sub-modulators and a main modulator, the two sub-modulators are an upper arm modulator and a lower arm modulator respectively, and the acquisition of the optical signal output by the adjustable laser and the input of the optical signal to the preset modulator through the polarization controller comprise the following steps: The optical signal is divided into two optical signals by the polarization controller; One of the two optical signals is input to the upper arm modulator in the preset modulator, and the other of the two optical signals is input to the lower arm modulator in the preset modulator.

3. The method of claim 2, wherein, After the input of one of the two optical signals to the upper arm modulator in the preset modulator and the input of the other of the two optical signals to the lower arm modulator in the preset modulator, the following steps are further included: An initial direct current bias voltage generated by the polarization controller is input to the preset modulator; The initial direct current bias voltage is adjusted until the current direct current bias voltage, the current working voltage of the sub-modulator and the current working voltage of the main modulator are consistent and reach a preset value, and then the adjustment is stopped, so that the two sub-modulators and the main modulator of the preset modulator all work at the maximum transmission point.

4. The method of any one of claims 1 to 3, wherein, The driving signal comprises an upper arm driving signal and a lower arm driving signal, and before the preset modulator outputs the first positive and negative second-order sidebands and the second positive and negative second-order sidebands, the method further comprises: modulating the optical signal entering the upper arm modulator by the upper arm driving signal; modulating the optical signal entering the lower arm modulator by the lower arm driving signal.

5. The method of claim 4, wherein, The loading of the driving signal on the preset modulator comprises: adjusting the power of the upper arm driving signal so that the upper arm modulator outputs the first positive and negative second-order sidebands; adjusting the power of the lower arm driving signal so that the lower arm modulator outputs the second positive and negative second-order sidebands.

6. A microwave generating device, characterized by The device comprises: a signal input module configured to acquire an optical signal output by a tunable laser and input the optical signal to a preset modulator through a polarization controller; a sideband output module configured to load a driving signal on the preset modulator and adjust the power of the driving signal so that the preset modulator outputs first positive and negative second-order sidebands and second positive and negative second-order sidebands; a sideband quadrature module configured to input the first positive and negative second-order sidebands and the second positive and negative second-order sidebands to a polarization maintaining Bragg grating through a circulator, make the first positive and negative second-order sidebands and the second positive and negative second-order sidebands orthogonal to each other through a band-stop filter of the polarization maintaining Bragg grating, and obtain the first positive and negative second-order sidebands and the second positive and negative second-order sidebands after quadrature, wherein the positive sideband and the negative sideband in the first positive and negative second-order sidebands are orthogonal to each other, and the positive sideband and the negative sideband in the second positive and negative second-order sidebands are orthogonal to each other; a sideband modulation module configured to reflect the first positive and negative second-order sidebands after quadrature through a mirror, input the first positive and negative second-order sidebands to a first polarization beam splitter after separation of the first positive and negative second-order sidebands by the first polarization beam splitter, obtain a positive sideband and a negative sideband, input the positive sideband to a first phase modulator for modulation to obtain a first target signal, input the negative sideband to a second phase modulator for modulation to obtain a second target signal, and directly transmit the second positive and negative second-order sidebands after quadrature to obtain a third target signal; a microwave signal generation module configured to input the first target signal, the second target signal, and the third target signal to a second polarization beam splitter after combination of the first target signal, the second target signal, and the third target signal by a coupler, separate the combined target signal by the second polarization beam splitter to obtain a first optical signal and a second optical signal, input the first optical signal to a first photodetector for frequency mixing to generate a first microwave signal, and input the second optical signal to a second photodetector for frequency mixing to generate a second microwave signal.

7. A microwave generator, characterized by The microwave generator comprises a memory, a processor, and a microwave generation program stored on the memory and executable on the processor, and the microwave generation program is configured to implement the microwave generation method according to any one of claims 1 to 5.

8. A storage medium, characterized by The storage medium has stored thereon a microwave generation program which, when executed by the processor, implements the microwave generation method according to any one of claims 1 to 5.

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