CN112310786B - Composite signal source and method for generating infrared and microwave composite signals - Google Patents
Composite signal source and method for generating infrared and microwave composite signals Download PDFInfo
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Abstract
The application discloses a composite signal source and a method for generating infrared and microwave composite signals, wherein the composite signal source comprises: the device comprises a first laser, a first coupler, a photoelectric detector, a second laser, a second coupler, a converter and a beam combiner; the first laser is used for generating a first optical signal; the second laser is used for generating a second optical signal; the second coupler is used for dividing the second optical signal into two paths of optical signals, coupling one path of the second optical signal to the first coupler and coupling the other path of the second optical signal to the converter; the first coupler is used for coupling the first optical signal and one path of second optical signal to the photoelectric detector; the photoelectric detector is used for generating a microwave signal; the converter is used for converting the other path of the second optical signal into an infrared signal; the beam synthesizer is used for synthesizing the microwave signal and the infrared signal into a coaxial composite signal. The method and the device solve the problem that a composite signal source for generating infrared and microwave composite signals in the prior art is complex in structure.
Description
Technical Field
The present application relates to the field of composite signal source technology, and in particular, to a composite signal source and method for generating infrared and microwave composite signals.
Background
With the rapid development of military technology, the accurate guided weapon has more and more important status in national defense construction and modern war. The precision guided weapon usually adopts a multimode system, and the hit precision of a missile is improved by means of a multivariate information fusion technology, so that the precision guided weapon with an infrared and microwave dual-mode guidance system becomes the mainstream of the current weapon system development, in order to reduce the times of outfield tests and save the cost, semi-physical simulation experiments of various precision guided weapons are urgently needed to be realized under laboratory conditions, and a core device of the semi-physical simulation system is a composite signal source with the radiation characteristics of infrared signals and microwave signals.
At present, a traditional composite signal source is composed of two independent signal sources of an infrared signal source and a microwave-transparent anti-infrared beam synthesizer, wherein the infrared signal source adopts a black body or a resistor array, the microwave signal source adopts a microwave signal generator, and coaxial composite output of an infrared signal and a microwave signal is realized through the microwave-transparent anti-infrared beam synthesizer. Therefore, the existing composite signal source needs two independent signal sources, and the structure is complex and the cost is high.
Disclosure of Invention
The technical problem that this application was solved is: aiming at the problem that the structure of a composite signal source for generating infrared and microwave composite signals is complex in the prior art, the composite signal source and the method for generating the infrared and microwave composite signals are provided, generating a first optical signal by a first laser and a second optical signal by a second laser, then the second optical signal is divided into two optical signals by a second coupler, one optical signal is coupled to the first coupler and the other optical signal is coupled to a converter, then the first optical signal and one path of second optical signal are coupled to the photoelectric detector through the first coupler, then the microwave signal is generated through the photoelectric detector, the other path of second optical signal is converted into an infrared signal through the converter, and finally the microwave signal and the infrared signal are synthesized into a coaxial composite signal through the beam synthesizer. The microwave signal and the infrared signal can be simultaneously generated by one signal source, and the defects of complex structure and high cost caused by the integration of two independent module systems of the infrared signal source and the microwave signal source in the traditional scheme are overcome.
In a first aspect, an embodiment of the present application provides a composite signal source for generating an infrared and microwave composite signal, where the composite signal source includes: the microwave signal processing device comprises a first laser, a first optical signal amplifier, a modulator, a first coupler, a photoelectric detector, a filter, a first microwave amplifier, a microwave transmitting antenna, a second microwave amplifier connected with the modulator, a signal generator connected with the second microwave amplifier, a second laser, a second coupler, a second optical signal amplifier, a beam expanding lens and a converter which are connected in sequence, and a beam combiner connected with the microwave transmitting antenna and the converter; wherein,
the first laser is used for generating a first optical signal; the second laser is used for generating a second optical signal; the second coupler is connected with the first coupler and is used for dividing the second optical signal into two paths of optical signals, coupling one path of the second optical signal to the first coupler and coupling the other path of the second optical signal to the converter; the first coupler is used for coupling the first optical signal and the second optical signal to the photoelectric detector; the photoelectric detector is used for generating a microwave signal according to the first optical signal and the one path of second optical signal; the converter is used for converting the other path of second optical signal into an infrared signal; and the beam synthesizer is used for synthesizing the microwave signal and the infrared signal into a coaxial composite signal.
In the scheme provided by the embodiment of the application, a first optical signal is generated through a first laser and a second optical signal is generated through a second laser, then one path of second optical signal is coupled to the first coupler through a second coupler to form two paths of optical signals, the other path of second optical signal is coupled to a converter, then the first optical signal and one path of second optical signal are coupled to a photoelectric detector through the first coupler, a microwave signal is generated through the photoelectric detector and the other path of second optical signal is converted into an infrared signal through the converter, and finally the microwave signal and the infrared signal are synthesized into a coaxial composite signal through a beam synthesizer. The microwave signal and the infrared signal can be simultaneously generated by one signal source, and the defects of complex structure and high cost caused by the integration of two independent module systems of the infrared signal source and the microwave signal source in the traditional scheme are overcome.
Optionally, the first laser and the second laser are both tunable wavelength lasers.
Optionally, the first coupler and the second coupler are both 3-port 3dB couplers, and the splitting ratios thereof are both 50%.
Optionally, the filter is a high pass filter with a cut-off frequency of 3 GHZ.
Optionally, the signal generator is a signal generator capable of adjusting waveform, repetition frequency and pulse width.
In a second aspect, an embodiment of the present application provides a method for generating a composite infrared and microwave signal, where the method is applied to the composite signal source in the first aspect, and the method includes:
generating a first optical signal through a first laser and a second optical signal through a second laser, amplifying the first optical signal through a first optical signal amplifier to obtain an amplified first optical signal, generating a driving signal through a signal generator and amplifying the driving signal through a second microwave amplifier to obtain an amplified driving signal;
modulating the amplified first optical signal through a modulator to obtain a modulated first optical signal, dividing the second optical signal into a first signal and a second signal through a second coupler, sending the first signal to the first coupler and sending the second signal to a second optical signal amplifier;
sending the modulated first optical signal and the first signal to the photoelectric detector through the first coupler, generating a microwave signal through the photoelectric detector according to an optical heterodyne method, and sending the microwave signal to a filter;
filtering the microwave signal through the filter to obtain a filtered microwave signal, amplifying the filtered microwave signal through a first microwave amplifier to obtain an amplified microwave signal, and radiating the amplified microwave signal through a microwave transmitting antenna;
the second signal is amplified through the second optical signal amplifier to obtain an amplified second signal, the amplified second signal is subjected to beam expanding and widening processing through a beam expanding lens, the expanded and widened second signal is converted into a path of infrared signal through a converter, and the amplified microwave signal and the path of infrared signal are synthesized into a coaxial composite signal through a beam synthesizer.
Optionally, the first optical signal has a wavelength of 1550.18nm and the second optical signal has a wavelength of 1550.1 nm.
Drawings
Fig. 1 is a schematic structural diagram of a composite signal source for generating infrared and microwave composite signals according to an embodiment of the present disclosure;
FIG. 2 is a schematic diagram of a beam expander provided in an embodiment of the present application;
fig. 3 is a schematic diagram of an infrared signal spot provided in an embodiment of the present application;
FIG. 4 is a diagram of a spectrum of a dual wavelength optical signal provided by an embodiment of the present application;
FIG. 5 is a spectrum of a dual wavelength optical signal output with single loading of modulation information according to an embodiment of the present application;
fig. 6 is a graph of a microwave signal spectrum provided by an embodiment of the present application;
FIG. 7 is a waveform diagram of a microwave signal according to an embodiment of the present application;
fig. 8 is a flowchart illustrating a method for generating a composite infrared and microwave signal according to an embodiment of the present disclosure.
Detailed Description
In order to better understand the technical solutions of the present application, the following detailed descriptions of the technical solutions of the present application are provided with the accompanying drawings and the specific embodiments, and it should be understood that the specific features in the embodiments and the examples of the present application are detailed descriptions of the technical solutions of the present application, and are not limitations of the technical solutions of the present application, and the technical features in the embodiments and the examples of the present application may be combined with each other without conflict.
Referring to fig. 1, an embodiment of the present application provides a composite signal source for generating a composite signal of infrared and microwave, the composite signal source including: a first laser 1, a first optical signal amplifier 2, a modulator 3, a first coupler 4, a photoelectric detector 5, a filter 6, a first microwave amplifier 7, a microwave transmitting antenna 8, a second microwave amplifier 9 connected with the modulator 3, a signal generator 10 connected with the second microwave amplifier 9, a second laser 11, a second coupler 12, a second optical signal amplifier 13, a beam expander 14 and a converter 15, which are connected in sequence, and a beam combiner 16 connected with the microwave transmitting antenna 8 and the converter 15; wherein the first laser 1 is used for generating a first optical signal; the second laser 11 is used for generating a second optical signal; the second coupler 12 is connected to the first coupler 4, and configured to divide the second optical signal into two optical signals, couple one of the optical signals to the first coupler 4, and couple the other of the optical signals to the converter 15; the first coupler 4 is configured to couple the first optical signal and the one path of second optical signal to the photodetector 5; the photoelectric detector 5 is configured to generate a microwave signal according to the first optical signal and the one path of second optical signal; the converter 15 is configured to convert the another path of second optical signal into an infrared signal; the beam combiner 16 is configured to combine the microwave signal and the infrared signal into a coaxial composite signal.
Specifically, in the solution provided in this embodiment of the present application, the signal source may generate two signals, namely an infrared signal and a microwave signal, and for convenience of understanding, the following briefly describes the processes of generating the microwave signal and generating the infrared signal, respectively.
Process for generating microwave signals
Specifically, a first optical signal is generated by the first laser 1, a second optical signal is generated by the second laser 11, then the first optical signal is sent to the first optical signal amplifier 2 by the first laser 1, the first optical signal amplifier 2 amplifies the first optical signal to obtain an amplified first optical signal, the second optical signal is sent to the second coupler 12 by the second laser 11, and then the amplified first optical signal is sent to the modulator 3 by the first optical signal amplifier 2.
Further, the modulator 3 needs to modulate the amplified first optical signal after receiving the amplified first optical signal. Therefore, in order to modulate the amplified first optical signal, in the solution provided in the embodiment of the present application, a signal generator 10 is further provided, and the signal generator 10 is configured to generate a signal with any waveform, repetition frequency, and pulse width, where any waveform includes, but is not limited to, a pulse, a sine, or a sawtooth, and the waveform, repetition frequency, and pulse width of the signal generated by the specific signal generator 10 are determined by the input information, that is, the input information can be adjusted according to the actual requirement to generate the modulated signal corresponding to the actual requirement. The signal generator 10 generates any waveform, repetition frequency and pulse width signal, and then sends the generated any waveform, repetition frequency and pulse width signal to the second microwave amplifier 9, the second microwave amplifier 9 amplifies any waveform, repetition frequency and pulse width signal to obtain an amplified driving signal, and then inputs the amplified first optical signal and the amplified driving signal to the modulator 3.
Specifically, the modulator 3 includes three ports, which are a port a, a port b, and a port C, and the modulator 3 is connected to the first optical signal amplifier 2 through the port a, connected to the second microwave amplifier 9 through the port b, and connected to the first coupler 4 through the port C, wherein the type of the modulator 3 is various, for example, the modulator 3 is a mach-zehnder intensity modulator.
Further, the modulator 3 receives the amplified first optical signal through the port a and receives the amplified driving signal through the port b, the amplified driving signal modulates the amplified first optical signal through the modulator 3 to obtain a modulated first optical signal, and then the modulated first optical signal is sent to the first coupler 4 through the port C.
Further, in the solution provided in the embodiment of the present application, the first coupler 4 is connected to the second coupler 12 in addition to the modulator 3. The second laser 11 sends the generated second optical signal to the second coupler 12, and the second coupler 12 splits the second optical signal into two optical signals, one of which is sent to the first coupler 4 and the other of which is sent to the second optical signal amplifier 13.
After receiving the modulated first optical signal and one optical signal sent by the second coupler 12, the first coupler 4 sends the modulated first optical signal and one optical signal sent by the second coupler 12 to the photodetector 5, the photodetector 5 performs photoelectric conversion on the modulated first optical signal and one optical signal sent by the second coupler 12, performs photoelectric conversion on the two optical signals by using an optical heterodyne method to obtain a microwave signal, and sends the microwave signal to the filter 6. The filter 6 filters the microwave signal to obtain a filtered microwave signal, wherein the filter 6 is a high-pass filter.
Further, the filter 6 sends the filtered microwave signal to the first microwave amplifier 7, the first microwave amplifier 7 performs power amplification on the filtered microwave signal to obtain an amplified microwave signal, and the amplified microwave signal is sent to the microwave transmitting antenna 8 to be radiated.
Second, process for generating infrared signal
Specifically, the second coupler 12 sends one optical signal of the second optical signals to the first coupler 4, and also needs to send the other optical signal of the second optical signals to the second optical signal amplifier 13, then the second optical signal amplifier 13 performs power amplification on the other optical signal to obtain an amplified second optical signal, and then sends the amplified second optical signal to the beam expander 14, where the beam expander has a structure as shown in fig. 2.
After receiving the amplified second optical signal, the beam expander 14 expands the amplified second optical signal, and then sends the expanded and expanded second optical signal to the converter 15, and then the converter 15 converts the expanded and expanded second optical signal into a path of infrared signal. Specifically, the principle of the converter 15 converting the laser signal into the infrared signal is to realize the conversion of light-heat-light, the laser signal irradiates the conversion module to generate heat energy, and the heat energy is converted into the infrared signal radiated outwards, because the laser signal has the advantages of narrow line width, high spectral radiation emittance and the like, the apparent temperature on the conversion module is very high, and the infrared signal has strong infrared radiation characteristics, and the generated infrared light spot is as shown in fig. 3.
Further, in the solution provided in this embodiment of the present application, after the microwave transmitting antenna 8 radiates a microwave signal and the converter 15 converts the expanded and broadened optical signal into a path of infrared signal, the beam combiner 16 receives the microwave signal radiated by the microwave transmitting antenna 8 and receives the infrared signal generated by the converter 15, and the beam combiner 16 combines the received microwave signal and the received infrared signal into a coaxial composite signal.
Further, in order to improve the applicability of the composite signal source, in a possible implementation manner, the first laser 1 and the second laser 11 are both tunable wavelength lasers.
Specifically, in the solution provided in the embodiment of the present application, by adjusting parameter information of the first laser 1 and the second laser 11, wavelengths of the first optical signal and the second optical signal generated by the first laser 1 and the second laser 11 may be adjusted, and then microwave signals of different frequencies may be generated by the first optical signal and the second optical signal of different wavelengths, specifically, referring to fig. 4, an output spectrogram of a dual-wavelength laser signal is provided in the embodiment of the present application. There are various wavelengths of the first and second optical signals generated by the first and second lasers 1 and 11, and one of them will be described as an example.
In one possible implementation, the first optical signal has an operating wavelength of 1550.18nm and the second optical signal has an operating wavelength of 1550.1 nm.
Further, in order to improve the quality of the microwave signal and the infrared signal generated by the composite signal source, in a possible implementation manner, the first coupler 4 and the second coupler 12 are both 3-port 3dB couplers, and the splitting ratio thereof is 50%.
Specifically, three ports of the first coupler 4 are a port d, a port e, and a port f, respectively; the three ports of the second coupler 12 are port h, port i and port j, respectively. The second laser 11 is connected with the port e of the first coupler 4 through the port j of the second coupler 12 to input 50% of the second optical signal; the other 50% of the second optical signal enters the second optical signal amplifier 13 through the port i of the second coupler 12, the amplified optical signal is irradiated onto the converter 15 through the beam expander 14 to generate an infrared signal, and the optical signal is converted into an infrared signal and then enters the beam combiner 16. The modulated first optical signal and one path of second optical signal enter from a port d and a port e of the first coupler 4 respectively, and are output through a port f of the first coupler 4 after beam combination and enter the photoelectric detector 5.
In one possible implementation, the filter 6 is a high-pass filter with a cut-off frequency of 3 GHZ.
In one possible implementation, the signal generator 10 is a waveform, repetition frequency, pulse width adjustable signal generator.
Specifically, in the solution provided in the embodiment of the present application, the signal generator 10 is an arbitrary waveform generator, for example, the signal generated by the signal generator 10 is sinusoidal, pulsed, or rectangular. To facilitate verification of the microwave and infrared composite signals generated by the composite signal source, the following description is given by way of example.
For example, if it is assumed that the signal generated by the signal generator 10 is an intensity-modulated sinusoidal analog signal of 800MHz, the modulated first optical signal and one path of the second optical signal are combined by the first coupler 4, and the output spectrum of the single path of the dual-wavelength laser signal loaded with modulation information after combining is as shown in fig. 5, and modulation variable bands with an interval of 800MHz appear on the first optical signal, which indicates that the loading of the modulation information on the first optical signal is completed.
Further, the dual-wavelength laser signal output as shown in fig. 5 is input to the photoelectric detector 5 for photoelectric conversion, and after the low-frequency modulation component interference is filtered by the filter 6 with the cut-off frequency of 3GHz, the generation of the high-frequency microwave signal with modulation information is realized, and the specific frequency spectrum of the microwave signal is shown in fig. 6. It can be seen from fig. 6 that the frequency at the highest position of the spectrogram is 9.69GHz, a modulation sideband appears at each interval of 800MHz on both sides of a 9.69GHz high-frequency microwave signal, where the 9.69GHz high-frequency microwave signal is a carrier, and the appearing modulation sideband is modulation information loaded on the 9.69GHz carrier signal, in order to verify the correctness of the above statement, the signal is sent to a high-speed oscilloscope for observation, and the waveform of the high-frequency microwave signal with the modulation information is as shown in fig. 7, and it can be clearly seen that the 9.69GHz high-frequency carrier signal is modulated by the intensity of a sinusoidal analog signal of 800 MHz. The 9.69GHz high-frequency carrier signal in FIG. 6 is generated because the wavelength interval of the two-wavelength laser signal is 0.08nm, and the 9.69GHz high-frequency carrier signal can be obtained after photoelectric conversion, and the modulation sidebands appearing at the interval of 800MHz are because the modulation rate loaded by the arbitrary waveform generator is 800 MHz. The 9.69GHz high-frequency carrier signal with the modulation information is amplified by a first microwave amplifier 7 and then transmitted by a microwave transmitting antenna 8. The infrared signal and the microwave signal with the modulation information are synthesized into a coaxial composite signal through the beam synthesizer 16, so that the infrared signal and the microwave signal are generated in a composite mode.
In the scheme provided by the embodiment of the application, a first optical signal is generated by a first laser 1 and a second optical signal is generated by a second laser 11, then the second optical signal is divided into two paths by a second coupler 12, one path of the second optical signal is coupled to a first coupler 4 to form two paths of optical signals, the other path of the second optical signal is coupled to a converter 15, then the first optical signal and one path of the second optical signal are coupled to a photoelectric detector 5 by the first coupler 4, a microwave signal is generated by the photoelectric detector 5 and the other path of the second optical signal is converted into an infrared signal by the converter 15, and finally the microwave signal and the infrared signal are synthesized into a coaxial composite signal by a beam synthesizer 16. The microwave signal and the infrared signal can be simultaneously generated by one signal source, and the defects of complex structure and high cost caused by the integration of two independent module systems of the infrared signal source and the microwave signal source in the traditional scheme are overcome.
The embodiments of the present application will be described in further detail with reference to the accompanying drawings, wherein the method is applied to the composite signal source shown in fig. 1, and with reference to fig. 8, the method includes:
step 801, generating a first optical signal by a first laser and a second optical signal by a second laser, amplifying the first optical signal by the first optical signal amplifier to obtain an amplified first optical signal, and generating a driving signal by a signal generator and amplifying the driving signal by a second microwave amplifier to obtain an amplified driving signal.
Step 802, modulating the amplified first optical signal by the amplified driving signal and the modulator to obtain a modulated first optical signal, dividing the second optical signal into two paths of signals, namely a first signal and a second signal, by the second coupler, sending the first signal to the first coupler and sending the second signal to the second optical signal amplifier.
Step 803, the modulated first optical signal and the first signal are sent to the photodetector through the first coupler, a microwave signal is generated by the photodetector according to an optical heterodyne method, and the microwave signal is sent to a filter.
Step 804, filtering the microwave signal by the filter to obtain a filtered microwave signal, amplifying the filtered microwave signal by a first microwave amplifier to obtain an amplified microwave signal, and radiating the amplified microwave signal by a microwave transmitting antenna.
Step 805, amplifying the second signal by the second optical signal amplifier to obtain an amplified second signal, performing beam expanding and broadening processing on the amplified second signal by a beam expander, converting the expanded and broadened second signal into a path of infrared signal by a converter, and synthesizing the amplified microwave signal and the path of infrared signal into a coaxial composite signal by a beam synthesizer.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.
Claims (7)
1. A composite signal source for generating a composite infrared and microwave signal, comprising: the microwave signal processing device comprises a first laser (1), a first optical signal amplifier (2), a modulator (3), a first coupler (4), a photoelectric detector (5), a filter (6), a first microwave amplifier (7), a microwave transmitting antenna (8), a second microwave amplifier (9) connected with the modulator (3), a signal generator (10) connected with the second microwave amplifier (9), a second laser (11), a second coupler (12), a second optical signal amplifier (13), a beam expander (14) and a converter (15) which are connected in sequence, and a beam combiner (16) connected with the microwave transmitting antenna (8) and the converter (15); wherein,
the first laser (1) is used for generating a first optical signal; the second laser (11) is used for generating a second optical signal; the second coupler (12) is connected to the first coupler (4) and configured to split the second optical signal into two optical signals, couple one of the optical signals to the first coupler (4) and couple the other optical signal to the converter (15); the first coupler (4) is used for coupling the first optical signal and the one path of second optical signal to the photoelectric detector (5); the photoelectric detector (5) is used for generating a microwave signal according to the first optical signal and the one path of second optical signal; the converter (15) is used for converting the other path of second optical signal into an infrared signal; the beam synthesizer (16) is used for synthesizing the microwave signal and the infrared signal into a coaxial composite signal.
2. The composite signal source of claim 1, wherein the first laser (1) and the second laser (11) are both wavelength-tunable lasers.
3. The composite signal source of claim 2, wherein the first coupler (4) and the second coupler (12) are 3-port 3dB couplers each having a splitting ratio of 50%.
4. The composite signal source of any of claims 1 to 3, wherein the filter (6) is a high pass filter with a cut-off frequency of 3 GHZ.
5. A composite signal source according to any one of claims 1 to 3, characterised in that the signal generator (10) is a waveform, repetition frequency, pulse width adjustable signal generator.
6. A method for generating infrared and microwave composite signals, which is applied to the composite signal source according to any one of claims 1 to 5, and comprises the following steps:
generating a first optical signal through a first laser and a second optical signal through a second laser, amplifying the first optical signal through a first optical signal amplifier to obtain an amplified first optical signal, generating a driving signal through a signal generator and amplifying the driving signal through a second microwave amplifier to obtain an amplified driving signal;
modulating the amplified first optical signal through a modulator to obtain a modulated first optical signal, dividing the second optical signal into a first signal and a second signal through a second coupler, sending the first signal to the first coupler and sending the second signal to a second optical signal amplifier;
sending the modulated first optical signal and the first signal to the photoelectric detector through the first coupler, generating a microwave signal through the photoelectric detector according to an optical heterodyne method, and sending the microwave signal to a filter;
filtering the microwave signal through the filter to obtain a filtered microwave signal, amplifying the filtered microwave signal through a first microwave amplifier to obtain an amplified microwave signal, and radiating the amplified microwave signal through a microwave transmitting antenna;
the second signal is amplified through the second optical signal amplifier to obtain an amplified second signal, the amplified second signal is subjected to beam expanding and widening processing through a beam expanding lens, the expanded and widened second signal is converted into a path of infrared signal through a converter, and the amplified microwave signal and the path of infrared signal are synthesized into a coaxial composite signal through a beam synthesizer.
7. The method of claim 6, wherein the first optical signal has a wavelength of 1550.18nm and the second optical signal has a wavelength of 1550.1 nm.
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