Microwave frequency measurement device based on instantaneous ultra-wideband two-dimensional information mapping

Abstract

The present invention discloses a microwave frequency measurement device based on instantaneous ultra-wideband dual-dimensional information mapping, which includes a tunable laser, an optical coupler, an intensity modulator, a radio frequency source, an optical filter, an optical amplifier, a circulator, an arbitrary waveform generator, an optical isolator, a high nonlinear optical fiber, a photodetector and an oscilloscope. The present invention obtains the time dimension information corresponding to the frequency of the unknown signal by subjecting unknown signals of different frequencies to the stimulated Brillouin scattering effect to frequency selection of a chirped light pulse sequence, and obtains the amplitude dimension information corresponding to the frequency of the unknown signal by utilizing the response difference of the passband edge of the first optical filter at different wavelengths; the frequency of the unknown signal can be measured with high precision by simultaneously mapping the time dimension information and the amplitude dimension information. The present measuring device can measure single-tone and multi-tone microwave signals at the same time, with fast measurement speed, high measurement accuracy and large instantaneous bandwidth.

Description

Technical Field

[0001] The invention belongs to the technical field of microwave photons, and in particular relates to a microwave frequency measurement device for instantaneous ultra-wideband dual-dimensional information mapping. Background Art

[0002] Microwave frequency measurement technology plays an extremely important role in the fields of communications, radar, aerospace, space exploration and medical treatment. However, due to the bottleneck of electronic devices, the measurement range of traditional electrical microwave frequency measurement systems is generally limited to 18 GHz, and its real-time measurement also has certain limitations. In recent years, microwave frequency measurement technology assisted by photonic technology has received a lot of research and attention in the technical fields of spectrum sensing due to its advantages of large bandwidth, anti-interference and high speed.

[0003] The key to photon-assisted microwave frequency measurement (MFM) technology is to use an electro-optic modulator (EOM) to map the frequency information of the microwave signal under test (SUT) to a known dimension, thereby realizing the measurement of the signal's frequency. MFM is mainly divided into two key links: spectrum selection and information mapping. Spectrum selection refers to the process of selecting specific frequency components from a complex spectrum. The main methods include stimulated Brillouin scattering (SBS). The frequency measurement method using the SBS effect for spectrum selection has the characteristics of small measurement error, wide measurement range and high measurement resolution. Recently, a dual-symmetric broadband adjustable instantaneous frequency measurement system based on the SBS effect was reported. The system uses a pulse-sampled SUT as the pump light and a scanning chirp signal as the detection light. The SBS effect is used for spectrum selection, and a time-frequency mapping function (Ft) is constructed for frequency measurement. The system achieves a maximum instantaneous bandwidth of 3.4GHz and a measurement accuracy of 1MHz.

[0004] In the above study, the narrowband filtering characteristics of the SBS effect were used to select the frequency of the SUT, and the time-frequency mapping function (Ft) and the power comparison function (ACF) were used to map the frequency information. However, this solution cannot avoid the contradiction between instantaneous bandwidth and measurement accuracy, and cannot achieve high-precision MFM. Summary of the invention

[0005] In order to solve the above technical problems, the present invention proposes an improved microwave frequency measuring device.

[0006] The technical solution of the present invention is as follows: a microwave frequency measurement device based on instantaneous ultra-wideband two-dimensional information mapping, which includes a light source for providing an optical carrier; a pump optical path coupled to the light source, the pump optical path including a radio frequency source for providing an unknown signal; a first intensity modulator, configured to use an optical carrier from the light source to perform optical carrier suppressed double-sideband modulation on the unknown signal to obtain a first modulated optical signal; a first optical filter, configured to retain a first-order optical sideband of the first modulated optical signal; an optical amplifier amplifies the first-order optical sideband to form an optical power that meets the requirements of the optical amplifier. A pump light having a threshold condition for stimulating Brillouin scattering effect; a detection optical path coupled to the light source, the detection optical path comprising an arbitrary waveform generator configured to generate a chirped microwave signal; a second intensity modulator configured to modulate the chirped microwave signal with the optical carrier to generate a second modulated optical signal to transmit the chirped microwave signal in the optical domain; a second optical filter configured to retain the negative first-order optical sideband of the second modulated optical signal to generate a chirped optical pulse sequence as the detection light; an optical circulator coupled to the pump optical path and the detection optical path, configured to receive the pump light and the The detection light; the optical circulator is also coupled to a high nonlinear optical fiber, so that the pump light and the detection light undergo stimulated Brillouin scattering effect in the high nonlinear optical fiber to complete spectrum selection; a photodetector is coupled to the optical circulator, and is configured to convert the optical signal after the spectrum selection into an electrical signal, wherein the time dimension information and amplitude dimension information corresponding to the signal peak of the electrical signal are used to map the frequency of the unknown signal; a signal representative is configured to access the electrical signal and generate an output signal based on the electrical signal, and the time dimension information and amplitude dimension information of the output signal are used to map the frequency information of the unknown signal (SUT); wherein the signal representative is configured to be consistent with the time trigger of the arbitrary waveform generator; wherein the first intensity modulator, the second intensity modulator and the photodetector are configured so that their respective bandwidths cover the frequency of the unknown signal; wherein the first optical filter is configured so that its passband edge covers the first-order sideband of the first intensity modulator, and the second optical filter is configured so that its passband edge covers the optical carrier and the negative first-order optical sideband of the chirped microwave signal.

[0007] In some embodiments, the first intensity modulator 3 is used to map the microwave signal into the optical domain, and the first optical filter with edge roll-off is used to generate a pump light signal carrying unknown frequency information.

[0008] In some embodiments, the light source includes a tunable laser and an optical coupler coupled to an output end of the tunable laser to provide the optical carrier to the first intensity modulator and the second intensity modulator.

[0009] In some embodiments, the detection optical path further includes an optical isolator, and the optical isolator is disposed between the second optical filter and the highly nonlinear optical fiber.

[0010] In some embodiments, the threshold condition of the stimulated Brillouin scattering effect is related to the length characteristics of the highly nonlinear optical fiber and environmental characteristics.

[0011] In some embodiments, the second optical filter is replaced by optical injection locking to preserve the first order sideband of the first modulated optical signal.

[0012] In some embodiments, the bandwidth of the chirped optical pulse train is selectable such that the instantaneous bandwidth of the microwave frequency measurement device is tunable.

[0013] In some embodiments, a first-order optical sideband of the first modulated optical signal is selected based on a passband edge of the first optical filter; and the negative first-order optical sideband of the second modulated optical signal is selected based on a passband of the second optical filter.

[0014] In some embodiments, the passband edge is a rising edge or a falling edge.

[0015] In some embodiments, the center frequency of the first optical filter is tunable, the center frequency of the second optical filter is tunable, and the frequency sweep range of the chirped microwave signal generated by the arbitrary waveform generator is tunable, thereby making the frequency measurement range of the microwave frequency measurement device tunable.

[0016] In some embodiments, the instantaneous bandwidth of the microwave frequency measurement device exceeds 10 GHz, the theoretical spectrum range covers P band to U band, and the frequency measurement error is less than 5 MHz.

[0017] In some embodiments, the signal display device is an oscilloscope or a logic analyzer.

[0018] The beneficial effect of the present application is that the microwave frequency measurement device in some embodiments of the present application performs spectrum selection on the chirped optical pulse sequence (COPS) by causing the optical signal carrying unknown frequency information to undergo stimulated Brillouin scattering (SBS) in the optical fiber, and then obtains the relative time dimension information and amplitude dimension information corresponding to the signal peak through the photodetector beat frequency, thereby mapping the frequency of the unknown signal. The frequency of the unknown signal can be measured with high precision through the simultaneous mapping of the time dimension information and the amplitude dimension information. The microwave quality measurement device in the embodiment of the present application can measure single-tone and multi-tone microwave signals at the same time, with a minimum measurement time of 100ns, a measurement accuracy of less than 5MHz, and an instantaneous bandwidth of more than 10GHz. Since the microwave frequency measurement device in the embodiment of the present application can freely select the bandwidth of COPS, its instantaneous bandwidth is flexible and adjustable, and the theoretical spectrum range covers the P band to the U band. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the principle of a microwave frequency measurement device for instantaneous ultra-wideband dual-dimensional information mapping according to an embodiment of the present application.

[0020] Figure 2A 4 is a spectrum diagram of pump light in a measurement device according to an embodiment of the present application.

[0021] Figure 2B 4 is a spectrum diagram of the detection light in the measurement device according to the embodiment of the present application.

[0022] Figure 2C This is a spectrum diagram of the mixed light after frequency selection due to stimulated Brillouin scattering effect in the measurement device according to the embodiment of the present application.

[0023] Figure 3 This is a schematic diagram of the single-tone signal spectrum measurement results.

[0024] Figure 4 Schematic diagram of the dual-tone signal spectrum measurement results.

[0025] In the figure: 1 is a tunable laser, 2 is an optical coupler, 3 is a first intensity modulator, 4 is a radio frequency source, 5 is a first optical filter, 6 is an optical amplifier, 7 is a circulator, 8 is a second intensity modulator, 9 is an arbitrary waveform generator, 10 is a second optical filter, 11 is an optical isolator, 12 is a highly nonlinear optical fiber, 13 is a photodetector, and 14 is an oscilloscope. DETAILED DESCRIPTION

[0026] In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved more clearly, further detailed descriptions are given below in conjunction with the accompanying drawings and embodiments.

[0027] According to the microwave frequency measurement device based on instantaneous ultra-wideband dual-dimensional information mapping of the embodiment of the present application, Figure 1 As shown, the device may include a tunable laser 1, an optical coupler 2, a first intensity modulator 3, a radio frequency source 4, a first optical filter 5, an optical amplifier 6, a circulator 7, a second intensity modulator 8, an arbitrary waveform generator 9, a second optical filter 10, an optical isolator 11, a highly nonlinear optical fiber 12, a photodetector 13 and an oscilloscope 14.

[0028] Wherein, the output end 11 of the tunable laser 1 is connected to the input end of the optical coupler 2, the optical coupler 2 is connected to the input port 31 of the first intensity modulator 3 through the first link 21, the output port 41 of the radio frequency source 4 is connected to the radio frequency input port 32 of the first intensity modulator 3, the output port 33 of the first intensity modulator 3 is connected to the input port 51 of the first optical filter 5, the output port 52 of the first optical filter 5 is connected to the input port 61 of the optical amplifier 6, the output port 62 of the optical amplifier 6 is connected to the first port 71 of the optical circulator 7, the second link 22 of the optical coupler is connected to the input port 81 of the second intensity modulator 8, and the output end 91 of the arbitrary waveform generator 9 is connected to the radio frequency input port 82 of the second intensity modulator 8 The output port 83 of the second intensity modulator 8 is connected to the input port 101 of the second optical filter 10, the output port 102 of the second optical filter 10 is connected to the input port 111 of the optical isolator 11, the output port 112 of the optical isolator 11 is connected to the input port 121 of the highly nonlinear optical fiber 12, the output port 122 of the highly nonlinear optical fiber 12 is connected to the second port 72 of the optical ring 7, the third port 73 of the optical circulator 7 is connected to the input port 131 of the photodetector 13, the output port 132 of the photodetector 13 is connected to the receiving port 141 of the oscilloscope 14, and the time trigger port 92 of the arbitrary waveform generator 9 is connected to the time trigger receiving port 142 of the oscilloscope 14, so as to ensure the consistency of the time trigger at this time.

[0029] The tunable laser 1 and the optical coupler 2 constitute a light source for providing an optical carrier; a first intensity modulator 3, a radio frequency source 4, a first optical filter 5, and an optical amplifier 6 constitute a pump optical path, wherein the radio frequency source 4 is used to provide an unknown signal; the first intensity modulator 3 is configured to perform optical carrier suppressed double-sideband modulation on the unknown signal using an optical carrier from the light source to obtain a first modulated optical signal MS1; the first optical filter 5 is configured to retain a first-order optical sideband of the first modulated optical signal; the optical amplifier 6 amplifies the first-order optical sideband to form a pump light whose optical power meets the threshold condition of the stimulated Brillouin scattering effect;

[0030] The second intensity modulator 8, the arbitrary waveform generator 9, and the second optical filter 10 constitute a detection optical path, wherein the arbitrary waveform generator 9 is configured to generate a chirped microwave signal; the second intensity modulator 8 is configured to modulate the chirped microwave signal with the optical carrier to generate a second modulated optical signal MS2 to transmit the chirped microwave signal in the optical domain; the second optical filter 10 is configured to retain the negative first-order optical sideband of the second modulated optical signal to generate a chirped optical pulse sequence (COPS) as a detection light; the detection optical path may also include an optical isolator.

[0031] The optical circulator 7 is coupled to the pump light path and the detection light path, and is configured to receive the pump light and the detection light; the optical circulator 7 is also coupled to the highly nonlinear optical fiber 12, so that the pump light and the detection light undergo stimulated Brillouin scattering (SBS) effect in the highly nonlinear optical fiber 12 to complete spectrum selection.

[0032] Wherein, the photodetector 13 is coupled to the optical circulator 7, and is configured to convert the optical signal after the spectrum selection into an electrical signal, wherein the time dimension information and amplitude dimension information corresponding to the signal peak of the electrical signal are used to map the frequency of the unknown signal; the oscilloscope 14 is configured to access the electrical signal and generate an output signal based on the electrical signal, and the time dimension information and amplitude dimension information of the output signal are used to map the frequency information of the unknown signal (SUT); wherein the signal representative is configured to be consistent with the time trigger of the arbitrary waveform generator 9; wherein the first intensity modulator 3, the second intensity modulator 8 and the photodetector 13 are configured so that their respective bandwidths cover the frequency of the unknown signal; wherein the first optical filter 5 is configured so that its passband rising edge covers the first-order sideband output by the first intensity modulator 53, and the second optical filter 10 is configured so that its passband covers the optical carrier and the negative first-order optical sideband of the chirped microwave signal.

[0033] The first intensity modulator, the second intensity modulator and the photodetector are configured so that their respective bandwidths cover the frequency of the unknown signal to be measured; the first optical filter is configured so that its passband edge covers the first-order sideband output by the first intensity modulator, and the second optical filter is configured so that its passband covers the second optical carrier signal and the negative first-order chirped optical sideband; the optical amplifier is configured so that the amplified optical power satisfies the threshold condition of the stimulated Brillouin scattering effect; wherein, the microwave signal is mapped to the optical domain using the first intensity modulator, and the pump optical signal carrying the frequency information of the unknown signal is generated in conjunction with the first optical filter and the optical amplifier with edge roll-off; the second intensity modulator is configured to load the input second optical carrier signal and the chirped microwave signal onto the second intensity modulator to form a second modulated optical signal, and the negative first-order sideband of the second modulated optical signal is retained through the second optical filter to generate a chirped optical pulse sequence.

[0034] Taking the frequency measurement range of 26GHz to 36GHz as an example: the optical signal with a wavelength of 1550.604nm output by the tunable laser 1 is coupled by the optical coupler 2 as the first optical carrier signal into the first intensity modulator 3 with a modulation bandwidth of 40GHz, and the unknown signal is subjected to carrier suppressed double-sideband modulation by the first intensity modulator 3. After filtering by the first optical filter 5 with a central wavelength of 1550.92nm and a bandwidth of 50GHz, only the first-order sideband is retained, and then the optical signal with the retained first-order sideband is amplified by the optical amplifier 6. At this time, the optical amplifier is a constant gain amplification with a constant gain of 500mw. The amplified optical signal is used as the pump light in the device; the optical signal with a wavelength of 1550.604nm output by the tunable laser 1 is coupled by the optical coupler 2 as the first optical carrier signal into the second intensity modulator 8 with a modulation bandwidth of 40GHz, and the second intensity modulator 8 cooperates with the arbitrary waveform generator The chirped microwave signal generated by the arbitrary waveform generator 9 generates a chirped optical pulse sequence (COPS). The chirped microwave signal generated by the arbitrary waveform generator 9 has a pulse period of 500ns, a duty cycle of 80%, and a frequency sweep range of 16-26GHz. The chirped optical pulse sequence (COPS) passes through a second optical filter 10 with a central wavelength of 1550.8nm and a bandwidth of 50GHz to filter out a second optical carrier signal and a corresponding first-order sideband. At this time, the optical signal is used as a detection light in the device, so that the pump light and the detection light enter the circulator 7. In the high nonlinear optical fiber 12 with a length of 1Km, stimulated Brillouin scattering (SBS) effect occurs to complete spectrum selection. After the frequency selection, the optical signal is converted into an electrical signal through a photodetector 13 with a bandwidth of 40GHz. The electrical signal passes through an oscilloscope 14 to obtain an output signal. The frequency information of the unknown signal (SUT) is obtained according to the time and power information of the output signal of the oscilloscope 14.

[0035] The specific working process of the microwave frequency measurement device proposed in the embodiment of the present application is as follows:

[0036] After connecting the devices of the measuring apparatus, turn on the switches of the devices to put all the devices into working state.

[0037] The optical signal f output by the tunable laser 1 is divided into two paths by the optical coupler 2, namely, a first optical carrier signal S1 transmitted via the first optical fiber link 21 and a second optical carrier signal S2 transmitted via the second optical fiber link 22. The first optical carrier signal S1 is subjected to carrier suppression double-sideband modulation by the first intensity modulator 3 on the unknown signal provided by the radio frequency source 4, and then filtered by the passband rising edge of the first optical filter 5 to retain the first-order optical sideband. The first-order optical sideband is then amplified by the optical amplifier 6 to obtain an optical signal as the pump optical signal in the measuring device of the present application. The spectrum of the pump optical signal is as shown in FIG. Figure 2A The second optical carrier signal S2 of another path is generated by the chirped microwave signal generated by the second intensity modulator 8 in cooperation with the arbitrary waveform generator 9 to generate a chirped optical pulse sequence (COPS). The chirped optical pulse sequence is obtained by retaining the second optical carrier signal and the corresponding first-order sideband through the second optical filter 10 as the detection optical signal in the measurement device of the present application. The spectrum of the detection optical signal is shown in Figure 2B Then the pump light signal and the detection light signal enter the circulator 7, and the stimulated Brillouin scattering effect occurs in the highly nonlinear optical fiber 12 to complete the spectrum selection; the spectrum at this time is as shown in Figure 2C As shown, after completing the spectrum frequency selection, a frequency-selected optical signal is obtained, and then the frequency-selected optical signal is converted into an electrical signal through a photoelectric detector 13, and the electrical signal is sent to an oscilloscope 14, and an output signal is obtained through the oscilloscope 14. The oscilloscope is triggered in accordance with the time of the arbitrary waveform generator 9; the frequency information of the unknown signal is obtained according to the time and power information of the output signal provided by the oscilloscope 14. At this time, the output spectrum is as shown Figure 3 shown.

[0038] To this end, the first intensity modulator 3, the second intensity modulator 8 and the photodetector 13 are configured so that their respective bandwidths cover the frequency of the unknown signal to be measured; the first optical filter 5 is configured so that its passband rising edge covers the first-order sideband output by the first intensity modulator 5, and the second optical filter 10 is configured so that its passband covers the second optical carrier signal and the negative first-order chirped optical sideband; the optical amplifier 6 is configured so that the optical power amplified by the optical amplifier 6 meets the threshold condition of the stimulated Brillouin scattering effect; the first intensity modulator 3 is configured to map the microwave signal to the optical domain, and to generate a pump optical signal carrying unknown frequency information in cooperation with the first optical filter 5 and the optical amplifier 6 with edge roll-off; the second intensity modulator 8 is configured so that the second optical carrier signal and the chirped microwave signal are loaded on the second intensity modulator 8 to form a second modulated optical signal, and the negative first-order optical sideband of the second modulated optical signal is retained through the second optical filter 10 to generate a chirped optical pulse sequence (COPS).

[0039] The above is a description of the principle of frequency measurement for a single-tone signal. It should be understood that the device can also perform frequency measurement on a dual-tone microwave signal. In this case, the output spectrum is as follows: Figure 4 shown.

[0040] Some embodiments of the present invention select the sideband information of the first modulated signal based on the edge of the first optical filter, such as the rising edge or the falling edge. Some embodiments of the present invention adjust the frequency measurement range of the measuring device of the present application by tuning the center frequency of the first optical filter 5 and the second optical filter 10 and the sweep frequency range of the chirped microwave signal generated by the arbitrary waveform generator 9. The first optical filter and the second optical filter are, for example, optical bandpass filters (OBPF) for filtering optical sidebands.

[0041] In some embodiments, optical injection locking may be used to retain the first-order sideband of the first modulated optical signal instead of the second optical filter 10 .

[0042] In some embodiments, in addition to using the oscilloscope as a signal representation device, a logic analyzer or other device may also be used.

[0043] The above description is only a preferred specific implementation of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field is within the technical scope of the present invention.

Claims

1. A microwave frequency measurement device based on instantaneous ultra-wideband dual-dimensional information mapping, characterized in that: include A light source, used for providing an optical carrier; A pump optical path coupled to the light source, the pump optical path comprising a radio frequency source (4) for providing an unknown signal; a first intensity modulator (3) configured to perform optical carrier suppressed double sideband modulation on the unknown signal using an optical carrier from the light source to obtain a first modulated optical signal (MS1); a first optical filter (5) configured to retain a first-order optical sideband of the first modulated optical signal; and an optical amplifier (6) amplifying the first-order optical sideband to form pump light whose optical power meets a threshold condition of a stimulated Brillouin scattering effect; A detection optical path coupled to the light source, the detection optical path comprising an arbitrary waveform generator (9) configured to generate a chirped microwave signal; A second intensity modulator (8) configured to modulate the chirped microwave signal with the optical carrier to generate a second modulated optical signal (MS2) so as to transmit the chirped microwave signal in the optical domain; A second optical filter (10) configured to retain a negative first-order optical sideband of the second modulated optical signal to generate a chirped optical pulse sequence (COPS) as a probe light; An optical circulator (7) coupled to the pump light path and the detection light path is configured to receive the pump light and the detection light; the optical circulator (7) is also coupled to a highly nonlinear optical fiber (12), so that the pump light and the detection light undergo stimulated Brillouin scattering (SBS) effect in the highly nonlinear optical fiber (12) to complete spectrum selection; A photodetector (13) coupled to the optical circulator (7) and configured to convert the spectrum-selected optical signal into an electrical signal, wherein the frequency of the unknown signal is mapped out from the time dimension information and the amplitude dimension information corresponding to the signal peak of the electrical signal; A signal representation device, configured to receive the electrical signal and generate an output signal based on the electrical signal, wherein the time dimension information and the amplitude dimension information of the output signal map the frequency information of the unknown signal (SUT); wherein the signal representation device is configured to be time-triggered in accordance with the arbitrary waveform generator (9); The first intensity modulator (3), the second intensity modulator (8) and the photodetector (13) are configured so that their respective bandwidths cover the frequency of the unknown signal; The first optical filter (5) is configured such that its passband edge covers the first-order sideband of the first intensity modulator (3), and the second optical filter (10) is configured such that its passband edge covers the optical carrier and the negative first-order optical sideband of the chirped microwave signal.

2. The microwave frequency measurement device based on instantaneous ultra-wideband dual-dimensional information mapping according to claim 1 is characterized in that: The first intensity modulator (3) is used to map the microwave signal into the optical domain, and the first optical filter (5) with edge roll-off is used to generate a pump optical signal carrying unknown frequency information.

3. The microwave frequency measurement device based on instantaneous ultra-wideband dual-dimensional information mapping according to claim 2 is characterized in that: The light source comprises a tunable laser (1) and an optical coupler (2) coupled to an output end of the tunable laser so as to provide the optical carrier to the first intensity modulator (3) and the second intensity modulator (8).

4. The microwave frequency measurement device based on instantaneous ultra-wideband dual-dimensional information mapping according to claim 2 is characterized in that: The detection optical path also includes an optical isolator, which is arranged between the second optical filter and the highly nonlinear optical fiber (12).

5. The microwave frequency measurement device based on instantaneous ultra-wideband dual-dimensional information mapping according to claim 2 is characterized in that: The threshold condition of the stimulated Brillouin scattering effect is related to the length characteristics of the highly nonlinear optical fiber (12) and the environmental characteristics; the second optical filter (10) is replaced by optical injection locking to retain the first-order sideband of the first modulated optical signal; the bandwidth of the chirped optical pulse sequence is selectable so that the instantaneous bandwidth of the microwave frequency measurement device is tunable.

6. The microwave frequency measurement device based on instantaneous ultra-wideband dual-dimensional information mapping according to claim 2 is characterized in that: A first-order optical sideband of the first modulated optical signal is selected based on the passband edge of the first optical filter; and the negative first-order optical sideband of the second modulated optical signal is selected based on the passband of the second optical filter.

7. The microwave frequency measurement device based on instantaneous ultra-wideband dual-dimensional information mapping according to claim 6 is characterized in that: The passband edge is a rising edge or a falling edge.

8. The microwave frequency measurement device based on instantaneous ultra-wideband dual-dimensional information mapping according to claim 2 is characterized in that: The center frequency of the first optical filter (5) is tunable, the center frequency of the second optical filter (10) is tunable, and the frequency sweep range of the chirped microwave signal generated by the arbitrary waveform generator (9) is tunable, so that the frequency measurement range of the microwave frequency measurement device is tunable.

9. The microwave frequency measurement device based on instantaneous ultra-wideband dual-dimensional information mapping according to claim 2, characterized in that: The instantaneous bandwidth of the microwave frequency measuring device exceeds 10 GHz, the theoretical spectrum range covers P band to U band, and the frequency measurement error is less than 5 MHz.

10. The microwave frequency measurement device based on instantaneous ultra-wideband dual-dimensional information mapping according to claim 2, characterized in that: The signal display device is an oscilloscope or a logic analyzer.

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