CN113985681A - Time domain cloaking switch based on light intensity modulator and time domain cloaking device - Google Patents
Time domain cloaking switch based on light intensity modulator and time domain cloaking device Download PDFInfo
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Abstract
The application provides a time domain stealth switch and a time domain stealth device based on a light intensity modulator. According to the scheme, the time domain stealth switch is driven to be opened in the time domain stealth window through the control signal, so that the time domain stealth switch divides the detection optical signal into one path of optical signal without light in the time domain stealth window and one path of optical signal with light in the time domain stealth window. The third optical intensity modulator then interacts the optical signal without light in the time domain cloaking window with the event signal to conceal the event of the event signal in the time domain cloaking window. The optical power combiner combines the optical signal with light in the time domain stealth window with the optical signal output by the third light intensity modulator so as to fill the optical gap in the time domain stealth window and achieve the purpose of stealth. In the time domain cloaking device of the scheme, the time domain cloaking switch can be controlled to be opened or closed through the control signal, and the purpose of adjusting the size of the time domain cloaking window can be realized through the pulse width of the control signal.
Description
Technical Field
The application relates to the technical field of stealth, in particular to a time domain stealth switch and a time domain stealth device based on a light intensity modulator.
Background
The stealth technology is firstly proposed in spatial stealth research, and the main idea is to precisely control the refractive index around a target object, so that the propagation direction of the detection light is changed when the detection light reaches the target object, the detection light is allowed to propagate by bypassing the target object, and the propagation direction of the detection light is restored after the detection light passes through the target object. In the whole process, the detection light does not interact with the target object and does not carry any information of the target object, so that a receiver cannot detect the existence of the target object through the detection light, and the target object is hidden in space.
According to the space-time duality theory, the method can also perform stealth on the occurred events in the time domain, namely a time domain stealth technology. At present, researchers propose methods for realizing time domain stealth by using a time domain lens and optical fiber dispersion. The size of the stealth time window generated by the method is determined by the linear chirp quantity of the detection light and the length of the optical fiber, and the size of the stealth time window is not flexibly adjusted. When a large time stealth window is needed, a time domain lens and an optical fiber dispersion stealth method are used to need dozens of kilometers of optical fibers, so that the device is large in size and not easy to integrate and use.
Disclosure of Invention
The embodiment of the application provides a time domain cloaking switch and a time domain cloaking device based on a light intensity modulator, wherein a control signal with an adjustable cloaking time window is generated by the time domain cloaking switch to modulate a detection light signal, so that the problem that the size of the cloaking time window is not flexibly adjusted in the time domain cloaking technology is solved.
In a first aspect, an embodiment of the present application provides a time-domain cloaking switch. The time domain cloaking switch comprises: an electrical signal modulator and an optical signal modulator.
Wherein the electrical signal modulator is configured to receive the control signal. The electric signal modulator is also used for outputting a first pulse signal and a second pulse signal under the driving of the control signal; the control signal indicates a time domain stealth window of the event signal; event information to be hidden in the event signal is located in the time domain hiding window; the waveform of the first pulse signal in the time domain stealth window is low level, and the waveform of the second pulse signal in the time domain stealth window is high level.
Wherein, the optical signal modulator is used for receiving the detection optical signal. The optical signal modulator is further configured to output a first optical signal based on the probe optical signal and the first pulse signal, and output a second optical signal based on the probe optical signal and the second pulse signal; the power of the first optical signal in the time domain stealth window is 0, and the power of the second optical signal in the time domain stealth window is not 0.
In one possible embodiment, the electrical signal modulator comprises: the pulse shaping device comprises an electric signal splitter, and a first pulse shaping branch and a second pulse shaping branch which are connected with the electric signal splitter.
The electrical signal splitter is configured to split a control signal into two identical branch electrical signals, the first pulse shaping branch is configured to output the first pulse signal based on one of the two identical branch electrical signals, and the second pulse shaping branch is configured to output the second pulse signal based on the other of the two identical branch electrical signals.
In one possible embodiment, the first pulse shaping branch comprises: a first pulse generator for outputting the first pulse signal based on one of the two identical branch electrical signals.
In one possible embodiment, the second pulse shaping branch comprises:
a logical not gate for outputting an inverted signal of the other of the two identical branch electrical signals;
a second pulse generator for outputting the second pulse signal based on the inverted signal.
In one possible embodiment, the optical signal modulator includes: the optical power divider, and a first optical intensity modulator and a second optical intensity modulator connected with the optical power divider;
wherein the optical power splitter is configured to split the probe optical signal into two identical branch optical signals, the first optical intensity modulator is configured to output the first optical signal based on the first pulse signal and one of the two identical branch optical signals, and the second optical intensity modulator is configured to output the second optical signal based on the second pulse signal and the other of the two identical branch optical signals.
In a second aspect, an embodiment of the present application provides a time domain cloaking device. The time domain cloaking device comprises: the device comprises a first bit code stream generator, a time domain stealth switch, a third light intensity modulator and a light power combiner.
The first bit code stream generator is used for outputting a control signal, and the control signal indicates a time domain stealth window of an event signal; and the event information to be hidden in the event signal is positioned in the time domain hiding window.
The time domain stealth switch is used for receiving a detection light signal and outputting a first light signal and a second light signal based on the detection light signal under the driving of the control signal; the power of the first optical signal in the time domain stealth window is 0, and the power of the second optical signal in the time domain stealth window is not 0.
Wherein the third light intensity modulator is configured to output a third light signal based on the event signal and the first light signal; and the power of the third optical signal in the time domain stealth window is 0, and the third optical signal does not carry the information of the event to be stealthed.
Wherein the optical power combiner is configured to output a fourth optical signal based on the second optical signal and the third optical signal; the power of the fourth optical signal in the time domain stealth window is not 0, and the fourth optical signal does not carry the information of the event to be stealthed.
In a possible implementation, the temporal cloaking device further includes: an electrical signal generator for outputting the event signal.
In one possible embodiment, the electrical signal generator comprises:
a second bit stream generator for outputting a bit stream sequence indicating the event signal;
and the third pulse generator is used for outputting the event signal based on the bit code stream sequence.
In a third aspect, an embodiment of the present application further provides a control method, which is used in the time domain cloaking device in the foregoing second aspect and optional embodiments thereof. The control method comprises the following steps:
controlling the first bit code stream generator to output a control signal; the control signal indicates a time domain stealth window of the event signal; event information to be hidden in the event signal is located in the time domain hiding window;
controlling the time domain stealth switch to receive a detection light signal; the time domain cloaking switch is driven by a control signal to output a first optical signal and a second optical signal based on the detection optical signal; the power of the first optical signal in the time domain stealth window is 0, and the power of the second optical signal in the time domain stealth window is not 0;
controlling the third light intensity modulator to output a third light signal based on the event signal and the first light signal; the power of the third optical signal in the time domain stealth window is 0, and the third optical signal does not carry the information of the event to be stealthed;
controlling the optical power combiner to output a fourth optical signal based on the second optical signal and the third optical signal; the power of the fourth optical signal in the time domain stealth window is not 0, and the fourth optical signal does not carry the information of the event to be stealthed.
Drawings
Fig. 1 is a schematic structural diagram of a time-domain stealth switch 100 provided in an embodiment of the present application;
fig. 2 is a schematic structural diagram of an electrical signal modulator 101 provided in an embodiment of the present application;
fig. 3 is a schematic structural diagram of an optical signal modulator 102 according to an embodiment of the present disclosure;
fig. 4 is a schematic structural diagram of a time-domain cloaking device according to an embodiment of the present application;
fig. 5A is a schematic waveform diagram of a first optical signal provided in an embodiment of the present application;
fig. 5B is a schematic waveform diagram of a second optical signal provided in the present embodiment;
FIG. 5C is a schematic waveform diagram of an event signal provided by an embodiment of the present application;
fig. 5D is a schematic waveform diagram of a third optical signal provided in the present embodiment;
fig. 5E is a schematic waveform diagram of a fourth optical signal provided in the embodiment of the present application;
fig. 6 is a flowchart of a method for controlling a time domain cloaking device according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions of the embodiments of the present application will be described below with reference to the accompanying drawings.
In the description of the embodiments of the present application, the words "exemplary," "for example," or "for instance" are used to mean serving as an example, instance, or illustration. Any embodiment or design described herein as "exemplary," "e.g.," or "e.g.," is not to be construed as preferred or advantageous over other embodiments or designs. Rather, use of the words "exemplary," "e.g.," or "exemplary" is intended to present relevant concepts in a concrete fashion.
In the description of the embodiments of the present application, the term "and/or" is only one kind of association relationship describing an associated object, and means that three relationships may exist, for example, a and/or B may mean: a exists alone, B exists alone, and A and B exist at the same time. In addition, the term "plurality" means two or more unless otherwise specified. For example, the plurality of systems refers to two or more systems, and the plurality of screen terminals refers to two or more screen terminals.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit indication of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. The terms "comprising," "including," "having," and variations thereof mean "including, but not limited to," unless expressly specified otherwise.
Temporal stealth techniques are similar to spatial stealth techniques. The time domain stealth idea is that a time gap without light existence is generated on the time dimension of the detection light, if an event occurs in the time gap, the event cannot act with the detection light, and the time gap is restored after the event occurs, so that the event is hidden in the time domain.
For example, in a scheme of implementing time domain stealth by using a time domain lens and fiber dispersion, a linear chirped probe light signal is generated in a stealth time window by using the time domain lens, chirped probe light is transmitted in a single-mode fiber, and due to the dispersion effect of the single-mode fiber, a time gap without optical power is generated by a leading light with a high propagation speed and a following light with a low propagation speed in the chirped probe light due to a speed difference. Under this design, if an event occurs in the time gap, the event will not interact with the probe light, and then the time gap is stitched by performing the reverse operation (i.e. the leading light propagates slowly and the following light propagates fast) through a section of dispersion compensation fiber, thereby hiding the event in the time domain.
In the above example, the size of the stealth time window generated by the time domain lens and the optical fiber dispersion is not flexible enough, and on the premise that the size of the stealth time window is determined, the chirp change rate and range of the detection light and the optical fiber length factor need to be balanced in the design process, which is relatively complex. In order to realize a relatively large time stealth window, a time domain lens and an optical fiber dispersion stealth method need dozens of kilometers of optical fibers, so that the device is large in size and not easy to integrate.
In addition, the time domain stealth is realized by utilizing the time domain lens and the optical fiber dispersion, and a key point is the manufacture of the time domain lens, and researchers propose to manufacture the time domain prism, but the time domain prism is complex to realize and has great difficulty; researchers propose that the time domain lens is realized by utilizing the frequency sweeping technology, the method is relatively simple compared with the time domain prism, but the method relates to the technologies of optical frequency comb generation and flat optimization, frequency sweeping micro-ring resonator design and the like, and the realization process still has certain complexity.
In view of this, embodiments of the present application provide a time domain cloaking switch and a time domain cloaking device including the same. In the time domain cloaking device, the opening and closing of the time domain cloaking are controlled by a control signal of a time domain cloaking switch, and the aim of controlling a cloaking time window is fulfilled. The time domain cloaking switch and the time domain cloaking device will be described in detail with reference to the accompanying drawings. It should be noted that in the embodiments of the present application, electrical signals or optical signals are transmitted between the respective components, and therefore, two different line marks are used to distinguish the two signals in the drawings.
Fig. 1 is a schematic structural diagram of a time-domain stealth switch 100 according to an embodiment of the present application.
As shown in fig. 1, the time-domain cloaking switch 100 includes an electrical signal modulator 101 and an optical signal modulator 102, and the electrical signal modulator 101 is electrically connected to the optical signal modulator 102.
The electrical signal modulator 101 is configured to receive the control signal and output a pulse signal with a high level and a low level opposite to each other based on the control signal, where the pulse signal includes a first pulse signal and a second pulse signal. The high and low levels are opposite to each other, which means that the first pulse signal is at a high level and the second pulse signal is at a low level at the same time.
The control signal is an electric signal and indicates a time domain stealth window of the event signal, and event information to be stealthed in the event signal is located in the time domain stealth window. Specifically, the pulse width of the control signal can be designed according to the size of the stealth window of the event signal time domain, so that the purpose of adjusting and controlling the size of the stealth window is achieved.
The waveform of the first pulse signal in the time domain stealth window is low level, and the waveform of the second pulse signal in the time domain stealth window is high level. The specific structure of the electrical signal modulator 101 can be seen from the structure shown in fig. 2, and the specific description will be described later.
The optical signal modulator 102 is configured to receive a probe optical signal (an optical signal emitted by a laser shown in fig. 1) from the outside, and modulate the probe optical signal into two optical signals, including a first optical signal and a second optical signal. The power of the first optical signal in the time domain stealth window is 0, and the power of the second optical signal in the time domain stealth window is not 0. Specifically, the first optical signal is used to interact with the event signal to obtain a third optical signal. Because the first optical signal has a time gap with the power of 0 in the time domain stealth window, the third optical signal obtained by the action of the first optical signal and the event signal does not carry the event information to be stealthed of the event signal. Specifically, the second optical signal is used for interacting with the third optical signal to obtain a fourth optical signal. Since the power of the second optical signal within the time-domain stealth window is not 0, it can recover the time gap in the third optical signal. The specific structure of the optical signal modulator 102 can be seen from the structure shown in fig. 3, and the specific description will be described later.
In the above, the time-domain cloaking switch 100 is configured to modulate the detection optical signal into one optical signal with a time gap in the time-domain cloaking window according to the designed control signal, so that the optical signal cannot detect the event signal event when acting with the event signal, and modulate the detection optical signal into the other backup optical signal without a time gap in the time-domain cloaking window, so as to repair the time gap of the former optical signal by using the backup optical signal, so that a detector cannot detect the processing of the detection optical signal by the time-domain cloaking switch 100, thereby achieving the cloaking purpose.
Fig. 2 is a schematic structural diagram of an electrical signal modulator 101 according to an embodiment of the present disclosure.
As shown in fig. 2, the electric signal modulator 101 includes: an electrical signal splitter 1011, and first and second pulse shaping branches connected to the electrical signal splitter.
The electric signal splitter is used for receiving the control signal, and the electric signal splitter is used for splitting the control signal into two same branch electric signals which are respectively input into the first pulse forming branch and the second pulse forming branch. The first pulse shaping branch circuit outputs a first pulse signal based on one branch circuit electric signal, and the second pulse shaping branch circuit outputs the second pulse signal based on the other branch circuit electric signal.
For example, the first pulse shaping branch may be the first pulse generator 1012 as shown in fig. 2, and the second pulse shaping branch may be the not logic gate 1013 and the second pulse generator 1014 as shown in fig. 2. The not gate 1013 is configured to output an inverted signal of the electrical signal of the other branch, specifically, modulate a high level of the electrical signal of the other branch to a low level, and modulate a low level of the electrical signal of the other branch to a high level.
Fig. 3 is a schematic structural diagram of an optical signal modulator 102 according to an embodiment of the present disclosure.
As shown in fig. 3, the optical signal modulator 102 includes an optical power distributor 1021, and a first optical intensity modulator 1022 and a second optical intensity modulator 1023 connected to the optical power distributor 1021. The first optical intensity modulator 1022 is further configured to receive the first pulse signal output by the electrical signal modulator 101, and the second optical intensity modulator 1023 is further configured to receive the second pulse signal output by the electrical signal modulator 101.
Specifically, the optical power splitter 1021 is configured to split the detection optical signal into two same branch optical signals, and the two same branch optical signals are respectively input to the first optical intensity modulator 1022 and the second optical intensity modulator 1023. Optical power splitter 1021 is a 2-output-port passive optical device with a 1:1 power ratio, and thus can be understood as 2 output beams of optical power splitter 1021 having the same wavelength, the same phase change, and the same optical power, where the optical power is equal to half of the probe optical signal (e.g., the output of the laser in fig. 1).
Specifically, the first optical intensity modulator 1022 modulates the input probe optical signal and the first pulse signal into a first optical signal output, and the second optical intensity modulator 1023 modulates the input probe optical signal and the second pulse signal into a second optical signal output.
The first optical intensity modulator 1022 and the second optical intensity modulator 1023 are the same type and performance parameter devices, and it is further understood that the first and second optical intensity modulators have the same modulation effect on the amplitude and phase of the input optical signal under the same driving signal condition. The optical intensity modulator relates to a driving pulse signal, an input optical signal and an output optical signal, and the working process of the optical intensity modulator can be described as follows: the optical intensity modulator modulates the intensity of the input optical signal under the driving of the driving pulse signal, and then outputs the modulated optical signal. It should be noted that any other modulation device or modulation system that meets the above modulation procedures and effects belongs to the optical intensity modulator of the present embodiment.
In one example, the optical intensity modulator may employ an electro-absorption modulator, such as a Mach-Zehnder modulator. The first optical intensity modulator 1022 and the second optical intensity modulator 1023 may each implement the modulation process described above using a mach-zehnder modulator.
Based on the foregoing time-domain cloaking switch 100, an embodiment of the present application provides a time-domain cloaking device to implement cloaking processing on an event signal.
Fig. 4 is a schematic structural diagram of a time-domain cloaking device according to an embodiment of the present application.
As shown in fig. 4, the time domain cloaking device includes: the time domain cloaking switch 100, the third light intensity modulator 200, the optical power combiner 300, the first bit stream generator 400 and the electrical signal generator 500.
The first bit stream generator 400 is configured to generate a control signal for driving the time-domain cloaking switch 100, where the control signal indicates a time-domain cloaking window of the event signal. The electrical signal generator 500 is configured to generate and output an event signal, where event information to be concealed exists in the time domain concealment window.
For example, the first bit stream generator 400 may generate a symbol "0101" sequence as a control signal for driving the time domain cloaking switch 100, where a symbol "0" in the "0101" sequence indicates that the time domain cloaking switch 100 turns on the time domain cloaking function, a symbol "1" indicates that the time domain cloaking switch 100 turns off the time domain cloaking function, and accordingly, a time period corresponding to the symbol "0" is a time domain cloaking window.
In one example, the electrical signal generator 500 may include a second bit stream generator and a third pulse generator. For example, taking the example of generating the event signal shown in fig. 5C as an example, the second bitstream generator may output a bitstream sequence "0011", where "0" indicates no event and "1" indicates an event. The third pulse generator bit stream sequence "0011" outputs the aforementioned event signal.
The time-domain cloaking switch 100 is configured to receive a probe optical signal from the outside, and modulate the probe optical signal into two optical signals (a first optical signal and a second optical signal) according to a control signal from the first bit stream generator 400 for output. The specific structure and function of the time-domain cloaking switch 100 can be referred to the structures shown in fig. 1 to fig. 3 and the description thereof.
For example, in the case where the control signal is the sequence "0101" (i.e. the temporal stealth window is 0-1 time period and 2-3 time period), the temporal stealth switch 100 may modulate the probe optical signal into the first optical signal shown in fig. 5A and the second optical signal shown in fig. 5B. As can be seen from FIG. 5A, the first optical signal has time gaps in the time periods 0-1 and 2-3, and the power of the first optical signal in the two time periods is 0. Corresponding to the first optical signal, as can be seen from fig. 5B, the second optical signal has no time gap in the 0-1 period and the 2-3 period, and the power of the second optical signal in the two periods is not 0.
The third optical intensity modulator 200 is configured to receive the event signal and the first optical signal, and modulate the event signal and the first optical signal into a third optical signal to be output. For the description of the third optical intensity modulator 200, reference may be made to the foregoing description of the first and second optical intensity modulators, and details thereof are not repeated here.
For example, the event signal may be that no event occurs within 0-2 time period and an event occurs within 2-4 time period, as shown in FIG. 5C. For another example, when the third optical intensity modulator 200 interacts the event signal shown in fig. 5C with the first optical signal shown in fig. 5A to obtain the third optical signal shown in fig. 5D, the event within a period of 2-3 hours can be hidden.
Note that the event symbol "0" is represented by a rectangular high-level pulse. When the time domain cloaking switch is turned on, the detection light is restored after an event occurs, and finally a rectangular pulse is output, and the time domain cloaking switch is turned on and turned off and has no event occurrence output effect which needs to be the same, so that the event code element 0 needs to be represented by using the high-level rectangular pulse. The inverted Gaussian pulse is used for representing an event code element 1, wherein the characteristic that the change of two sides of the edge of the Gaussian pulse is slow can avoid the phenomenon that the power of the code element boundary changes suddenly to cause large ripple of an output signal, and further the stealth effect is influenced.
The optical power combiner 300 is configured to combine the third optical signal and the second optical signal into a fourth optical signal, and output the fourth optical signal, where the power of the fourth optical signal in the time domain stealth window is not 0, and the fourth optical signal does not carry an event to be stealthed. Since the third optical signal has a time gap with a power of 0 in the time domain stealth window, the optical power combiner 300 may fill the time gap of the third optical signal with the second optical signal with a power different from 0 in the time domain stealth window.
For example, the fourth optical signal output by the optical power combiner 300 is as shown in fig. 5E, the power of the fourth optical signal in the time domain stealth window (0-1 time period and 2-3 time period) is not 0, and the fourth optical signal does not carry the event of the event signal in the 2-3 time period. Therefore, when the detector obtains the fourth optical signal, the detector cannot know the event of the event signal in 2-3 time periods.
In the time domain cloaking device, the time domain cloaking switch is used for controlling the time domain cloaking function to be turned on or off, and the pulse width of a control signal in the time domain cloaking switch is adjusted, so that the aim of flexibly adjusting the time domain cloaking window can be fulfilled. When the time domain cloaking switch is turned on, all the events (such as the events within the period of 2-3 in the graph of fig. 5C) are hidden within the time period of turning on the time domain cloaking switch; when the time-domain cloaking switch is turned off, an event (such as an event within a period of 3-4 in fig. 5C) can be normally detected. In addition, under the scene that the time stealth window is relatively large, the time domain stealth device is small in size and easy to integrate and use.
Based on the time domain cloaking device shown in fig. 4, an embodiment of the present application further provides a control method of the time domain cloaking device, which is used for controlling the time domain cloaking device shown in fig. 4 to implement the time domain cloaking function.
Fig. 6 is a flowchart of a method for controlling a time domain cloaking device according to an embodiment of the present application.
As shown in fig. 6, the control method includes steps S601 to S604 as follows.
Step S601, controlling the first bit stream generator to output a control signal, wherein the control signal indicates a time domain stealth window of the event signal, and event information to be stealthed in the event signal is located in the time domain stealth window.
Step S602, the time domain stealth switch is controlled to receive the detection light signal, and the time domain stealth switch outputs a first light signal and a second light signal based on the detection light signal under the driving of the control signal, where the power of the first light signal in the time domain stealth window is 0, and the power of the second light signal in the time domain stealth window is not 0.
Step S603, controlling the third light intensity modulator to output a third light signal based on the event signal and the first light signal, where the power of the third light signal in the time-domain stealth window is 0, and the third light signal does not carry information of the event to be stealthed.
Step S604, controlling the optical power combiner to output a fourth optical signal based on the second optical signal and the third optical signal, where the power of the fourth optical signal in the time domain stealth window is not 0, and the fourth optical signal does not carry information of the event to be stealthed.
In the above method embodiment, specific implementation processes of each step may refer to the hardware structures shown in fig. 1 to fig. 4 and descriptions in corresponding text descriptions, which are not described herein again.
In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When loaded and executed on a computer, cause the processes or functions described in accordance with the embodiments of the invention to occur, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, from one website site, computer, server, or data center to another website site, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device, such as a server, a data center, etc., that incorporates one or more of the available media. The usable medium may be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., Solid State Disk (SSD)), among others.
It is to be understood that the various numerical references referred to in the embodiments of the present application are merely for descriptive convenience and are not intended to limit the scope of the embodiments of the present application. It should be understood that, in the embodiment of the present application, the sequence numbers of the above-mentioned processes do not mean the execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiment of the present application.
The above-mentioned embodiments, objects, technical solutions and advantages of the present application are further described in detail, it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the scope of the present application, and any modifications, equivalent substitutions, improvements and the like made on the basis of the technical solutions of the present application should be included in the scope of the present application.
Claims (9)
1. A time domain cloaking switch, the time domain cloaking switch comprising:
the electric signal modulator is used for receiving a control signal and outputting a first pulse signal and a second pulse signal under the driving of the control signal; the control signal indicates a time domain stealth window of the event signal; event information to be hidden in the event signal is located in the time domain hiding window; the waveform of the first pulse signal in the time domain stealth window is low level, and the waveform of the second pulse signal in the time domain stealth window is high level;
an optical signal modulator for receiving a probe optical signal, outputting a first optical signal based on the probe optical signal and the first pulse signal, and outputting a second optical signal based on the probe optical signal and the second pulse signal; the power of the first optical signal in the time domain stealth window is 0, and the power of the second optical signal in the time domain stealth window is not 0.
2. The time-domain cloaking switch as recited in claim 1 wherein said electrical signal modulator comprises: the pulse shaping device comprises an electric signal splitter, a first pulse shaping branch and a second pulse shaping branch, wherein the first pulse shaping branch and the second pulse shaping branch are connected with the electric signal splitter;
the electrical signal splitter is configured to split a control signal into two identical branch electrical signals, the first pulse shaping branch is configured to output the first pulse signal based on one of the two identical branch electrical signals, and the second pulse shaping branch is configured to output the second pulse signal based on the other of the two identical branch electrical signals.
3. The time-domain cloaking switch as recited in claim 2 wherein said first pulse shaping branch comprises:
a first pulse generator for outputting the first pulse signal based on one of the two identical branch electrical signals.
4. The time-domain cloaking switch as recited in claim 2 wherein said second pulse shaping branch comprises:
a logical not gate for outputting an inverted signal of the other of the two identical branch electrical signals;
a second pulse generator for outputting the second pulse signal based on the inverted signal.
5. The time domain cloaking switch as recited in claim 1 wherein said optical signal modulator comprises: the optical power divider, and a first optical intensity modulator and a second optical intensity modulator connected with the optical power divider;
wherein the optical power splitter is configured to split the probe optical signal into two identical branch optical signals, the first optical intensity modulator is configured to output the first optical signal based on the first pulse signal and one of the two identical branch optical signals, and the second optical intensity modulator is configured to output the second optical signal based on the second pulse signal and the other of the two identical branch optical signals.
6. A time domain cloaking device, wherein the time domain cloaking device comprises:
the first bit code stream generator is used for outputting a control signal, and the control signal indicates a time domain stealth window of an event signal; event information to be hidden in the event signal is located in the time domain hiding window;
the time domain cloaking switch is used for receiving a detection light signal and outputting a first light signal and a second light signal based on the detection light signal under the driving of the control signal; the power of the first optical signal in the time domain stealth window is 0, and the power of the second optical signal in the time domain stealth window is not 0;
a third optical intensity modulator for outputting a third optical signal based on the event signal and the first optical signal; the power of the third optical signal in the time domain stealth window is 0, and the third optical signal does not carry the information of the event to be stealthed;
an optical power combiner to output a fourth optical signal based on the second optical signal and the third optical signal; the power of the fourth optical signal in the time domain stealth window is not 0, and the fourth optical signal does not carry the information of the event to be stealthed.
7. The temporal cloaking device as recited in claim 6, further comprising:
an electrical signal generator for outputting the event signal.
8. The time-domain cloaking device as recited in claim 7, wherein the electrical signal generator comprises:
a second bit stream generator for outputting a bit stream sequence indicating the event signal;
and the third pulse generator is used for outputting the event signal based on the bit code stream sequence.
9. A control method for use in the time domain cloaking device as claimed in any one of claims 6 to 8, the control method comprising:
controlling the first bit code stream generator to output a control signal; the control signal indicates a time domain stealth window of the event signal; event information to be hidden in the event signal is located in the time domain hiding window;
controlling the time domain stealth switch to receive a detection light signal; the time domain cloaking switch is driven by a control signal to output a first optical signal and a second optical signal based on the detection optical signal; the power of the first optical signal in the time domain stealth window is 0, and the power of the second optical signal in the time domain stealth window is not 0;
controlling the third light intensity modulator to output a third light signal based on the event signal and the first light signal; the power of the third optical signal in the time domain stealth window is 0, and the third optical signal does not carry the information of the event to be stealthed;
controlling the optical power combiner to output a fourth optical signal based on the second optical signal and the third optical signal; the power of the fourth optical signal in the time domain stealth window is not 0, and the fourth optical signal does not carry the information of the event to be stealthed.
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