Broadband radio frequency delay storage device

Abstract

The invention provides a broadband radio frequency delay storage device which comprises a radio frequency power control module, an electro-optical conversion module, an optical fiber delay module and a photoelectric conversion module, and the four modules form a closed photoelectric loop. The radio frequency power control module converts the radio frequency signal and the received cyclic radio frequency signal into a conditioning radio frequency signal; the electro-optical conversion module is connected with the radio frequency power control module and converts the conditioned radio frequency signal into an optical modulation signal; the optical fiber delay module is connected with the electro-optical conversion module, delays the optical modulation signal to obtain a delayed optical modulation signal, and comprises an optical switch, a delay optical fiber and a beam combiner; the photoelectric conversion module is connected with the radio frequency power control module and the optical fiber delay module, and converts the delayed light modulation signal to obtain a delayed radio frequency signal and a cyclic radio frequency signal. According to the invention, based on the closed photoelectric loop, the radio frequency signal is circulated in the form of electricity-light-electricity, and the storage of the radio frequency signal is realized.

Description

Technical Field

[0001] The present disclosure relates to the technical field of radio frequency signal processing, and in particular to a broadband radio frequency delay storage device. Background Art

[0002] In the technical fields of RF signal simulation and electronic interference, it is necessary to delay and store RF signals of multiple frequency bands and multiple complex systems at the same time. The commonly used methods include traditional delay lines and digital RF storage. Traditional delay lines mainly include coaxial cables, mercury delay lines, etc., which generally have the problems of narrow working frequency band and short delay time; digital RF storage is processed by converting the signal from the analog domain to the digital domain, but due to the problems that the instantaneous bandwidth of digital RF storage is proportional to the sampling frequency, the dynamic range of the analog-to-digital converter or the digital-to-analog converter determines the dynamic range of the input signal, and the sampling and quantization process of digital storage frequency leads to a long response time. In addition, due to the limitations of the sampling theorem, digital RF storage is difficult to process broadband signals, and microwave signals need to be up-converted and down-converted during operation, which makes the final system more complex.

[0003] Existing delay devices based on optical switches mostly adopt an open-loop structure, with poor adjustability of the delay range and the inability to copy, store, and output the signal multiple times, making it difficult to use in RF signal simulation systems to achieve multiple radar target simulations. Summary of the invention

[0004] In view of the above problems, the present disclosure provides a broadband RF delay storage device to solve the problems in the prior art that due to device limitations, multi-band RF signals cannot be processed simultaneously, the delay range has poor adjustability, and the signal cannot be copied, stored, or output multiple times.

[0005] The present disclosure provides a broadband radio frequency delay storage device, comprising: a radio frequency power control module, an electro-optical conversion module, an optical fiber delay module and an optical-electrical conversion module, wherein the radio frequency power control module, the electro-optical conversion module, the optical fiber delay module and the optical-electrical conversion module form a closed optical-electrical loop;

[0006] The RF power control module is used to convert the RF signal and the received cyclic RF signal into a conditioned RF signal;

[0007] The electro-optical conversion module is connected to the RF power control module and is used to convert the conditioned RF signal into an optical modulation signal;

[0008] The optical fiber delay module is connected to the electro-optical conversion module and is used to delay the optical modulation signal to obtain a delayed optical modulation signal. The optical fiber delay module includes an optical switch, a delay optical fiber and a combiner;

[0009] The photoelectric conversion module is connected to the radio frequency power control module and the optical fiber delay module respectively, and is used to convert the delayed optical modulation signal into a delayed radio frequency signal and the cyclic radio frequency signal.

[0010] According to an embodiment of the present disclosure, the optical switch is connected to the beam combiner via the time-delay optical fiber;

[0011] The optical switch includes one 1*2 optical switch and N 2*2 optical switches, and the connectivity state of each optical switch is independently controlled;

[0012] The number of the delay optical fibers is N+1, the length of each delay optical fiber is different, and N is a positive integer greater than or equal to 1.

[0013] According to the embodiment of the present disclosure, the delay time corresponding to each section of the delay optical fiber is 2 m-1 Δt, wherein m is the number of segments corresponding to the delay optical fiber, Δt is the delay time corresponding to the delay optical fiber with the shortest length among the N+1 segments of the delay optical fiber, and m is an integer between 1 and N+1.

[0014] According to an embodiment of the present disclosure, the radio frequency power control module includes: a power combiner, an attenuator and a low noise amplifier, wherein the power combiner, the attenuator and the low noise amplifier are connected in sequence;

[0015] The power combiner is used to combine the radio frequency signal and the received cyclic radio frequency signal to obtain a combined radio frequency signal;

[0016] The attenuator and the low noise amplifier are used together to adjust the power of the synthesized radio frequency signal to obtain the conditioned radio frequency signal.

[0017] According to an embodiment of the present disclosure, the broadband radio frequency delay storage device further includes a host computer, and the host computer is used to control the attenuator and the low noise amplifier to adjust the power of the synthetic radio frequency signal.

[0018] According to an embodiment of the present disclosure, when the power of the synthesized RF signal is greater than or equal to a preset threshold, the host computer controls the attenuator and the low noise amplifier to reduce the power of the synthesized RF signal to within the dynamic range of the broadband RF delay storage device;

[0019] When the power of the synthesized RF signal is less than a preset threshold, the host computer controls the attenuator and the low noise amplifier to amplify the power of the synthesized RF signal within the dynamic range of the broadband RF delay storage device.

[0020] According to an embodiment of the present disclosure, the electro-optical conversion module includes a laser and a modulator, wherein the laser and the modulator are connected in series;

[0021] The laser is used to emit an optical carrier;

[0022] The modulator is used to modulate the conditioned radio frequency signal onto the optical carrier to obtain an optical modulated signal.

[0023] According to an embodiment of the present disclosure, the photoelectric conversion module includes a detector, a filter circuit, an amplifier circuit, a power divider, and a switch connected in sequence;

[0024] The detector is used to perform photoelectric conversion on the delayed optical modulation signal to obtain a photoelectric conversion signal;

[0025] The filtering circuit is used to filter out harmonic signals and stray signals in the photoelectric conversion signal and / or in the external environment to obtain a filtered radio frequency signal;

[0026] The amplifier circuit is used to amplify the filtered radio frequency signal to obtain a compensated amplified radio frequency signal;

[0027] The power divider is used to perform power division on the compensated amplified radio frequency signal to obtain the delayed radio frequency signal and the circulating radio frequency signal.

[0028] According to an embodiment of the present disclosure, when the switch is in an on state, the cyclic RF signal circulates at least once in the broadband RF delay storage device;

[0029] The maximum delay time of the broadband radio frequency delay storage device is the product of the delay time of the optical fiber delay module and the maximum number of cycles of the cyclic radio frequency signal, and the delay step is the delay time of the optical fiber delay module.

[0030] According to an embodiment of the present disclosure, the cyclic RF signal circulates in the broadband RF delay storage device for no more than 70 times.

[0031] The present invention is based on a closed structure of an optoelectronic loop, and adopts broadband electro-optical modulation technology and broadband optoelectronic conversion technology to store and delay radio frequency signals, thereby realizing a flexible and adjustable delay range and delay step, having the advantages of short response time and wide instantaneous coverage frequency range, and being able to perform delayed storage processing on signals of various complex systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The above contents and other purposes, features and advantages of the present disclosure will become more apparent through the following description of the embodiments of the present disclosure with reference to the accompanying drawings, in which:

[0033] Figure 1 A schematic diagram of a broadband radio frequency delay storage device according to an embodiment of the present disclosure is schematically shown;

[0034] Figure 2A The schematic diagram of the structure of a 1*2 magneto-optical switch according to an embodiment of the present disclosure is shown;

[0035] Figure 2B The schematic diagram of the structure of a 2*2 magneto-optical switch according to an embodiment of the present disclosure is shown;

[0036] Figure 3 A schematic diagram of a detector output signal spectrum according to an embodiment of the present disclosure is schematically shown;

[0037] Figure 4 A schematic diagram of a signal spectrum output by a channel filter at 4.2 GHz to 6.1 GHz according to an embodiment of the present disclosure is shown; and

[0038] Figure 5 The schematic diagram schematically shows the simulation result of the delayed radio frequency signal in the time domain waveform according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0039] Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. However, it should be understood that these descriptions are exemplary only and are not intended to limit the scope of the present disclosure. In the following detailed description, for ease of explanation, many specific details are set forth to provide a comprehensive understanding of the embodiments of the present disclosure. However, it is apparent that one or more embodiments may also be implemented without these specific details. In addition, in the following description, descriptions of known structures and technologies are omitted to avoid unnecessary confusion of the concepts of the present disclosure.

[0040] The terms used herein are only for describing specific embodiments and are not intended to limit the present disclosure. The terms "comprise", "include", etc. used herein indicate the existence of the features, steps, operations and / or components, but do not exclude the existence or addition of one or more other features, steps, operations or components.

[0041] All terms (including technical and scientific terms) used herein have the meanings commonly understood by those skilled in the art, unless otherwise defined. It should be noted that the terms used herein should be interpreted as having a meaning consistent with the context of this specification, and should not be interpreted in an idealized or overly rigid manner.

[0042] Figure 1 A schematic diagram of a broadband radio frequency delay storage device according to an embodiment of the present disclosure is schematically shown.

[0043] like Figure 1As shown, the broadband RF delay storage device includes: an RF power control module, an electro-optical conversion module, an optical fiber delay module and an optoelectronic conversion module, and the RF power control module, the electro-optical conversion module, the optical fiber delay module and the optoelectronic conversion module form a closed optoelectronic loop. The RF power control module converts the RF signal and the received cyclic RF signal into a conditioned RF signal, the electro-optical conversion module is connected to the RF power control module, and converts the conditioned RF signal into an optical modulation signal, the optical fiber delay module is connected to the electro-optical conversion module, and delays the optical modulation signal to obtain a delayed optical modulation signal, the optical fiber delay module includes an optical switch, a delay optical fiber and a beam combiner, and the optoelectronic conversion module is connected to the RF power control module and the optical fiber delay module respectively, and converts the delayed optical modulation signal into a delayed RF signal and a cyclic RF signal.

[0044] The present disclosure is based on a closed optoelectronic loop formed by an RF power control module, an electro-optical conversion module, an optical fiber delay module and an optoelectronic conversion module, so that the RF signal can circulate in the closed optoelectronic loop in the form of electrical-optical-electrical, and can output delayed RF signals repeatedly and multiple times, thereby realizing the storage of RF signals. The operating frequency of the broadband RF delay storage device provided by the present disclosure covers 2 to 18 GHz.

[0045] like Figure 1 As shown, in some embodiments of the present disclosure, the optical switch is connected to the combiner through a delay optical fiber, the optical switch includes 1 1*2 optical switch and N 2*2 optical switches, the connectivity status of each optical switch is independently controlled, the number of delay optical fibers is N+1 segments, the length of each delay optical fiber is different, and N is a positive integer greater than or equal to 1.

[0046] In some embodiments of the present disclosure, the delay time corresponding to each delay optical fiber is 2 m-1 Δt, where m is the segment number corresponding to the delay optical fiber segment, Δt is the delay time corresponding to the shortest delay optical fiber in the N+1 delay optical fibers, and m is an integer between 1 and N+1.

[0047] In the present disclosure, by combining and connecting N+1 optical switches (including 1 1*2 optical switch and N 2*2 optical switches) that independently control the connection state, 2 N+1 Different delay fiber combinations, adjustable delay range is 0 to (2 N+1 -1)Δt, the delay step is Δt.

[0048] In some embodiments of the present disclosure, the RF power control module includes: a power combiner, an attenuator and a low noise amplifier, which are connected in sequence; the power combiner synthesizes the RF signal and the received circulating RF signal to obtain a synthesized RF signal; the attenuator and the low noise amplifier adjust the power of the synthesized RF signal to obtain a conditioned RF signal.

[0049] In some embodiments of the present disclosure, the broadband radio frequency delay storage device further includes a host computer, and the host computer is used to control the attenuator and the low noise amplifier to adjust the power of the synthesized radio frequency signal.

[0050] In some embodiments of the present disclosure, when the power of the synthesized RF signal is greater than or equal to a preset threshold, the host computer controls the attenuator and the low noise amplifier to reduce the power of the synthesized RF signal to within the dynamic range of the broadband RF delay storage device; when the power of the synthesized RF signal is less than the preset threshold, the host computer controls the attenuator and the low noise amplifier to amplify the power of the synthesized RF signal within the dynamic range of the broadband RF delay storage device.

[0051] In the present disclosure, the attenuator and the low noise amplifier are controlled by the host computer to control the RF signal power of the input modulator to be as close as possible to the dynamic range of the broadband RF delay storage device, thereby improving the reliability of the output result.

[0052] In some embodiments of the present disclosure, the electro-optical conversion module includes a laser and a modulator, which are connected in series; the laser emits an optical carrier, and the modulator modulates the conditioned RF signal onto the optical carrier to obtain an optical modulated signal.

[0053] In some embodiments of the present disclosure, the photoelectric conversion module includes a detector, a filter circuit, an amplifier circuit, a power divider and a switch connected in sequence. The detector performs photoelectric conversion on the delayed optical modulation signal to obtain a photoelectric conversion signal, the filter circuit filters out harmonic signals and stray signals in the photoelectric conversion signal and / or in the external environment to obtain a filtered radio frequency signal, the amplifier circuit amplifies the filtered radio frequency signal to obtain a compensated amplified radio frequency signal, and the power divider performs power division on the compensated amplified radio frequency signal to obtain a delayed radio frequency signal and a circulating radio frequency signal.

[0054] In some embodiments of the present disclosure, when the switch is in the on state, the cyclic RF signal circulates at least once in the broadband RF delay storage device. The maximum delay time of the broadband RF delay storage device is the product of the delay time of the optical fiber delay module and the maximum number of cycles of the cyclic RF signal, and the delay step is the delay time of the optical fiber delay module.

[0055] In some embodiments of the present disclosure, the number of cycles of the cyclic RF signal in the broadband RF delay storage device is no more than 70 times.

[0056] The present invention adopts broadband electro-optical modulation technology, which can simultaneously modulate multiple sections of radio frequency signals onto an optical carrier, utilizes an optical fiber delay module to tunably store and delay the optical modulated signal, and adopts broadband photoelectric conversion technology to obtain a delayed radio frequency signal for output and a cyclic radio frequency signal for storage, thereby realizing the storage and delay of the radio frequency signal.

[0057] The following will specifically explain the delay and storage process of the RF signal using the broadband RF delay storage device provided by the present disclosure in conjunction with Figures 2-5.

[0058] In this embodiment, the operating frequency of the broadband RF delay storage device covers 2 to 18 GHz. The operating wavelength of the laser in the electro-optical conversion module is 1550 nm, and the corresponding frequency f0 is 193.1 THz. The laser outputs an optical carrier with a power of 16 dBm, and the optical carrier is a continuous wave signal. After the optical carrier is sent to a modulator with a working bandwidth of 20 GHz, the broadband electro-optical modulation technology is used to modulate the conditioned RF signal with a frequency f1 of 5 GHz output by the RF power control module onto the optical carrier signal to form an optical modulated signal, and the optical modulated signal is output to the optical fiber delay module. Among them, the optical modulated signal includes signals with frequencies of f0, f0+5 GHz, f0-5 GHz and high-order harmonic signals of the optical modulated signal.

[0059] Figure 2A The structure diagram of a 1*2 magneto-optical switch according to an embodiment of the present disclosure is schematically shown. Figure 2B The structural diagram of a 2*2 magneto-optical switch according to an embodiment of the present disclosure is schematically shown.

[0060] In this embodiment, the optical fiber delay module consists of a 1*2 optical switch, three 2*2 optical switches, four sections of delay optical fiber and a combiner. The optical switches are all magneto-optical switches. The delay times corresponding to the four sections of delay optical fiber are 0.5μs, 1μs, 2μs and 4μs respectively. Figure 2A As shown in the figure, the 1*2 magneto-optical switch has one input terminal and two output terminals. When the control voltage is at a low level (the level value is 0), the output is from output port 1; when the control voltage is at a high level (the level value is 1), the output is from output port 2. Figure 2BAs shown, the 2*2 magneto-optical switch has two inputs and two outputs. When the control voltage is at a low level (level value is 0), input port 1 is connected to output port 1, and input port 2 is connected to output port 2. When the control voltage is at a high level (level value is 1), input port 1 is connected to output port 2, and input port 2 is connected to output port 1. Table 1 shows the relationship between the on-state of the magneto-optical switch and the delay time of the optical fiber delay module. When the control signals of the four magneto-optical switches are all at a low level, the delay time of the optical fiber delay module is 0; when the control signal of the 1*2 magneto-optical switch is at a high level and the control signals of the other three 2*2 magneto-optical switches are at a low level, the delay time of the optical fiber delay module is 7.5μs, and the delay step of the optical fiber delay module is 0.5μs. When the control voltage level values ​​of the four groups of magneto-optical switches are 1, 1, 1, and 0, respectively, the delay time corresponding to the optical fiber delay module is 6.5μs.

[0061] Table 1 Comparison table of the on-state of the magneto-optical switch and the delay time of the optical fiber delay module

[0062]

[0063] Figure 3 The schematic diagram of the detector output signal spectrum according to the embodiment of the present disclosure is shown. In this embodiment, the working bandwidth of the detector in the photoelectric conversion module is 18 GHz. The detector performs photoelectric conversion on the delayed optical modulation signal and outputs the obtained photoelectric conversion signal to the filter circuit. The photoelectric conversion signal contains 5 GHz and high-order harmonic signals. The spectrum diagram of the photoelectric conversion signal is shown in FIG. Figure 3 shown.

[0064] Figure 4 The schematic diagram of the signal spectrum output by the filter in the 4.2GHz~6.1GHz channel system according to the embodiment of the present disclosure is schematically shown. In this embodiment, the filter circuit and the amplifier circuit filter, amplify and condition the input photoelectric conversion signal, and output a 5GHz compensated amplified RF signal to the power divider. Among them, the filter circuit adopts a pass filter group, including 5 channels of 2GHz~3GHz, 2.7GHz~4.5GHz, 4.2GHz~6.1GHz, 5.8GHz~10GHz, and 9.5GHz~18.5GHz, so as to filter out high-order harmonic signals in the photoelectric conversion signal. The 4.2GHz~6.1GHz channel is selected for filtering, and the schematic diagram of the spectrum of the filtered RF signal is shown in Figure 4 shown.

[0065] Figure 5The schematic diagram shows the simulation result of the delayed RF signal in the time domain waveform according to the embodiment of the present disclosure. In this embodiment, the amplifier circuit provides a low-noise amplification of not less than 30dB, and the power divider divides the compensating amplified RF signal into a delayed RF signal and a circulating RF signal. Compared with the received preset RF signal, the signal-to-noise ratio of the delayed RF signal and the circulating RF signal divided by the power divider are reduced, but the power and frequency of the delayed RF signal and the circulating RF signal are basically consistent with the preset RF signal. In practical applications, the on-state of the switch in the optoelectronic conversion module can be controlled according to the needs of the user, and the circulating RF signal can be fed back to the RF power control module at a specific number of times to achieve circulation and storage. When the signal-to-noise ratio of the delayed RF signal meets the basic requirements, the number of cycles should not exceed 70 times. When 10 cycles are performed, the delay range of the closed-loop optoelectronic loop is 0 to 65μs, and the delay step is 6.5μs. The delayed RF signal output after 10 cycles is simulated using simulation software, and the resulting time domain waveform is as shown in FIG. Figure 5 shown.

[0066] It should be noted that in the present disclosure, at least one of the RF power control module, the electro-optical conversion module, the optical fiber delay module and the optoelectronic conversion module can be at least partially implemented as a hardware circuit, such as a field programmable gate array (FPGA), a programmable logic array (PLA), a system on a chip, a system on a substrate, a system on a package, an application-specific integrated circuit (ASIC), or can be implemented by hardware or firmware such as any other reasonable way of integrating or packaging the circuit.

[0067] It will be appreciated by those skilled in the art that the features described in the various embodiments and / or claims of the present disclosure may be combined and / or combined in a variety of ways, even if such combinations and / or combinations are not explicitly described in the present disclosure. In particular, the features described in the various embodiments and / or claims of the present disclosure may be combined and / or combined in a variety of ways without departing from the spirit and teachings of the present disclosure. All of these combinations and / or combinations fall within the scope of the present disclosure.

[0068] The embodiments of the present disclosure are described above. However, these embodiments are only for illustrative purposes and are not intended to limit the scope of the present disclosure. Although the embodiments are described above separately, this does not mean that the measures in the various embodiments cannot be used in combination to advantage. The scope of the present disclosure is defined by the attached claims and their equivalents. Without departing from the scope of the present disclosure, those skilled in the art may make a variety of substitutions and modifications, which should all fall within the scope of the present disclosure.

Claims

1. A broadband radio frequency delay storage device, characterized in that: include: A radio frequency power control module, an electro-optical conversion module, an optical fiber delay module and an optical-electrical conversion module, wherein the radio frequency power control module, the electro-optical conversion module, the optical fiber delay module and the optical-electrical conversion module form a closed optical-electrical loop; The RF power control module is used to convert the RF signal and the received cyclic RF signal into a conditioned RF signal; The electro-optical conversion module is connected to the RF power control module and is used to convert the conditioned RF signal into an optical modulation signal; The optical fiber delay module is connected to the electro-optical conversion module and is used to delay the optical modulation signal to obtain a delayed optical modulation signal. The optical fiber delay module includes an optical switch, a delay optical fiber and a combiner; The photoelectric conversion module is connected to the radio frequency power control module and the optical fiber delay module respectively, and is used to convert the delayed optical modulation signal into a delayed radio frequency signal and the cyclic radio frequency signal.

2. The broadband radio frequency delay storage device according to claim 1, characterized in that: The optical switch is connected to the beam combiner via the delay optical fiber; The optical switch includes one 1*2 optical switch and N 2*2 optical switches, and the connectivity state of each optical switch is independently controlled; The number of the delay optical fibers is N+1, the length of each delay optical fiber is different, and N is a positive integer greater than or equal to 1.

3. The broadband radio frequency delay storage device according to claim 2, characterized in that: The delay time corresponding to each section of the delay optical fiber is 2 m-1 Δt, wherein m is the number of segments corresponding to the delay optical fiber, Δt is the delay time corresponding to the delay optical fiber with the shortest length among the N+1 segments of the delay optical fiber, and m is an integer between 1 and N+1.

4. The broadband radio frequency delay storage device according to claim 1, characterized in that: The radio frequency power control module comprises: a power combiner, an attenuator and a low noise amplifier, wherein the power combiner, the attenuator and the low noise amplifier are connected in sequence; The power combiner is used to combine the radio frequency signal and the received cyclic radio frequency signal to obtain a combined radio frequency signal; The attenuator and the low noise amplifier are used together to adjust the power of the synthesized radio frequency signal to obtain the conditioned radio frequency signal.

5. The broadband radio frequency delay storage device according to claim 4, characterized in that: The broadband radio frequency delay storage device further comprises a host computer, and the host computer is used to control the attenuator and the low noise amplifier to adjust the power of the synthetic radio frequency signal.

6. The broadband radio frequency delay storage device according to claim 5, characterized in that: When the power of the synthesized RF signal is greater than or equal to a preset threshold, the host computer controls the attenuator and the low noise amplifier to reduce the power of the synthesized RF signal to within the dynamic range of the broadband RF delay storage device; When the power of the synthesized RF signal is less than a preset threshold, the host computer controls the attenuator and the low noise amplifier to amplify the power of the synthesized RF signal within the dynamic range of the broadband RF delay storage device.

7. The broadband radio frequency delay storage device according to claim 1, characterized in that: The electro-optical conversion module includes a laser and a modulator, and the laser and the modulator are connected in series; The laser is used to emit an optical carrier; The modulator is used to modulate the conditioned radio frequency signal onto the optical carrier to obtain an optical modulated signal.

8. The broadband radio frequency delay storage device according to claim 1, characterized in that: The photoelectric conversion module includes a detector, a filter circuit, an amplifier circuit, a power divider and a switch connected in sequence; The detector is used to perform photoelectric conversion on the delayed optical modulation signal to obtain a photoelectric conversion signal; The filtering circuit is used to filter out harmonic signals and stray signals in the photoelectric conversion signal and / or in the external environment to obtain a filtered radio frequency signal; The amplifier circuit is used to amplify the filtered radio frequency signal to obtain a compensated amplified radio frequency signal; The power divider is used to perform power division on the compensated amplified radio frequency signal to obtain the delayed radio frequency signal and the circulating radio frequency signal.

9. A broadband radio frequency delay storage device according to claim 8, characterized in that: When the switch is in the on state, the cyclic radio frequency signal circulates at least once in the broadband radio frequency delay storage device; The maximum delay time of the broadband radio frequency delay storage device is the product of the delay time of the optical fiber delay module and the maximum number of cycles of the cyclic radio frequency signal, and the delay step is the delay time of the optical fiber delay module.

10. The broadband radio frequency delay storage device according to claim 9, characterized in that: The cyclic RF signal circulates in the broadband RF delay storage device for no more than 70 times.

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