Optical frequency comb generation system and control method

Abstract

The present invention provides an optical frequency comb generation system and control method. The system includes a first radio frequency source, a second radio frequency source, a third radio frequency source, a signal mixing circuit, a first phase modulator, a second phase modulator, and an optical combiner; the signal mixing circuit mixes the first radio frequency signal, the second radio frequency signal, and the third radio frequency signal to obtain a first mixed signal, and the first phase modulator modulates the first laser signal based on the first mixed signal to obtain a first optical frequency comb; the signal mixing circuit mixes the first radio frequency signal and the second radio frequency signal to obtain a second mixed signal, and the second phase modulator modulates the second laser signal based on the second mixed signal to obtain a second optical frequency comb; wherein the first laser signal and the second laser signal have the same frequency; the optical combiner combines the first optical frequency comb and the second optical frequency comb to output a target optical frequency comb. The present invention can generate a multi-comb line, high-flatness optical frequency comb with a simple system structure.

Description

Technical Field

[0001] The present invention relates to the field of laser technology, and in particular to an optical frequency comb generation system and a control method. Background Art

[0002] An optical frequency "comb" is a comb-like pattern of discrete, equally spaced frequencies. In optics, an optical frequency comb acts like a "ruler," enabling extremely precise measurement of optical frequencies. Currently, the most commonly used approach for generating optical frequency combs is using mode-locked lasers. While this approach produces a wide bandwidth, its disadvantage is that the comb spacing is difficult to adjust. Using a cyclic converter circuit can also produce a frequency comb with more spectral lines, but the generation structure is complex and susceptible to crosstalk and spontaneous emission noise. Exploiting nonlinear effects in highly nonlinear media is another option, but the low power efficiency of nonlinear media makes spectral line spacing difficult to adjust and results in poor flatness. Using electro-optic modulators, such as phase modulators, intensity modulators, polarization modulators, or combinations thereof, can generate high-quality, easily tunable optical frequency combs and have garnered considerable research attention.

[0003] Generating an optical frequency comb using an intensity modulator or polarization modulator requires precise control of the RF drive signal amplitude and phase, as well as the modulator bias voltage, increasing implementation complexity. Generating an optical frequency comb using a combination of modulators requires not only a precise parameter control system to ensure the comb's flatness, but also a linear increase in system complexity. Consequently, current optical frequency comb architectures struggle to balance optimal frequency comb characteristics with structural complexity. Summary of the Invention

[0004] Embodiments of the present invention provide an optical frequency comb generation system and control method to solve the problem that an optical frequency comb structure is difficult to take into account both optical frequency comb characteristics and structural complexity.

[0005] In a first aspect, an embodiment of the present invention provides an optical frequency comb generation system, comprising a first RF source, a second RF source, a third RF source, a signal mixing circuit, a first phase modulator, a second phase modulator, and an optical combiner; the first RF source, the second RF source, and the third RF source respectively emit a first RF signal, a second RF signal, and a third RF signal;

[0006] An input end of the first phase modulator is connected to the first radio frequency source, the second radio frequency source, and the third radio frequency source through a signal mixing circuit. The signal mixing circuit mixes the first radio frequency signal, the second radio frequency signal, and the third radio frequency signal to obtain a first mixed signal. The first phase modulator modulates the first laser signal based on the first mixed signal to obtain a first optical frequency comb.

[0007] An input end of the second phase modulator is connected to the first RF source and the second RF source via a signal mixing circuit. The signal mixing circuit mixes the first RF signal and the second RF signal to obtain a second mixed signal. The second phase modulator modulates the second laser signal based on the second mixed signal to obtain a second optical frequency comb. The first laser signal and the second laser signal have the same frequency.

[0008] The input end of the optical combiner is connected to the output ends of the first phase modulator and the second phase modulator respectively to combine the first optical frequency comb and the second optical frequency comb. The output end of the optical combiner outputs the target optical frequency comb.

[0009] In one possible implementation, the signal mixing circuit includes a multiplier;

[0010] Two input terminals of the multiplier are connected to the first radio frequency source and the second radio frequency source respectively, and the output terminal of the multiplier is connected to the input terminal of the second phase modulator.

[0011] In one possible implementation, the signal mixing circuit further includes a one-to-two electrical power splitter;

[0012] The input end of the one-to-two electric power divider is connected to the output end of the multiplier, the first output end is connected to the input end of the first phase modulator, and the second output end is connected to the input end of the second phase modulator.

[0013] In a possible implementation, the signal mixing circuit further includes an adder;

[0014] The first input end of the adder is connected to the third radio frequency source, the second input end is connected to the second output end of the one-to-two electrical power divider, and the output end is connected to the input end of the second phase modulator.

[0015] In one possible implementation, the device further includes a laser and a one-to-two optical power splitter; the laser is connected to the input end of the one-to-two optical power splitter, the first output end of the one-to-two optical power splitter is connected to the input end of the first phase modulator, and the second output end of the one-to-two optical power splitter is connected to the input end of the second phase modulator.

[0016] In a possible implementation, the frequency ratio of the first radio frequency signal, the second radio frequency signal, and the third radio frequency signal is 1:2:9, and the amplitude ratio is 1.8:1:1.675.

[0017] In a second aspect, an embodiment of the present invention provides a method for controlling an optical frequency comb generation system, comprising:

[0018] Obtain the comb line spacing of the target optical frequency comb;

[0019] determining the frequency of each radio frequency signal based on the comb line spacing;

[0020] Parameters of each radio frequency source are set based on each frequency to modulate the first laser signal and the second laser signal to obtain a target optical frequency comb.

[0021] In one possible implementation, determining the frequency of each radio frequency signal based on the comb line spacing includes:

[0022] X is used as the frequency of the first RF signal, 2X is used as the frequency of the second RF signal, and 9X is used as the frequency of the third RF signal; wherein X is the comb line spacing.

[0023] In a third aspect, an embodiment of the present invention provides a control device for an optical frequency comb generation system, characterized in that the control device includes:

[0024] An acquisition module, used to obtain the comb line spacing of the target optical frequency comb;

[0025] a calculation module, configured to determine the frequency of each radio frequency signal based on the comb line spacing;

[0026] The setting module is used to set the parameters of each radio frequency source based on each frequency to modulate the first laser signal and the second laser signal to obtain a target optical frequency comb.

[0027] In a fourth aspect, an embodiment of the present invention provides an optical frequency comb generation device, comprising an optical frequency comb generation system as described in the first aspect or any possible implementation of the first aspect, a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the steps of the method as described in the second aspect or any possible implementation of the second aspect are implemented.

[0028] In a fifth aspect, an embodiment of the present invention provides a computer-readable storage medium, which stores a computer program. When the computer program is executed by a processor, it implements the steps of the method described in the second aspect or any possible implementation of the second aspect.

[0029] The optical frequency comb generation system provided by the present invention has the following beneficial effects:

[0030] In the present invention, the signals from the three RF sources are mixed to drive the first phase modulator, which is equivalent to the three RF signals driving three phase modulators in series respectively. Each comb line passing through a phase modulator undergoes corresponding convolution, thereby increasing the number of comb lines. The signals from the two RF sources are mixed to drive the second phase modulator. After selecting the appropriate signal frequency and amplitude, the peak values ​​of the comb lines of the obtained second optical frequency comb near the center frequency are approximately equal to the peak values ​​of the comb lines on both sides of the first optical frequency comb. In addition, the first phase modulator and the second phase modulator modulate the laser signals of the same frequency so that the intermediate comb lines of the first optical frequency comb and the second optical frequency comb can completely overlap. The merged target optical frequency comb has multiple comb lines and high flatness. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0032] Figure 1 1 is a schematic structural diagram of an optical frequency comb generation system provided by one embodiment of the present invention;

[0033] Figure 2 is a schematic structural diagram of an optical frequency comb generation system provided by another embodiment of the present invention;

[0034] Figure 3 1 is a schematic structural diagram of a first optical frequency comb provided by an embodiment of the present invention;

[0035] Figure 4 is a schematic structural diagram of a second optical frequency comb provided by one embodiment of the present invention;

[0036] Figure 5 1 is a schematic structural diagram of a target optical frequency comb provided by an embodiment of the present invention;

[0037] Figure 6 This is a flow chart of an implementation method of a control method for an optical frequency comb generation system provided by one embodiment of the present invention;

[0038] Figure 7 1 is a schematic structural diagram of a control device for an optical frequency comb generation system according to an embodiment of the present invention;

[0039] Figure 8 Schematic diagram of an optical frequency comb generating device provided by one embodiment of the present invention. DETAILED DESCRIPTION

[0040] In the following description, specific details such as particular system structures and techniques are provided for purposes of illustration, not limitation, to facilitate a thorough understanding of the embodiments of the present invention. However, it will be apparent to those skilled in the art that the present invention may be practiced in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.

[0041] In order to make the purpose, technical solutions and advantages of the present invention more clear, specific embodiments will be described below with reference to the accompanying drawings.

[0042] Figure 1 This is a schematic diagram of the structure of the optical frequency comb generation system provided by an embodiment of the present invention. Figure 1 As shown, the optical frequency comb generation system includes a first RF source 11, a second RF source 12, a third RF source 13, a signal mixing circuit 14, a first phase modulator 15, a second phase modulator 16 and an optical combiner 17; the first RF source 11, the second RF source 12, and the third RF source 13 respectively emit a first RF signal, a second RF signal and a third RF signal;

[0043] An input end of the first phase modulator 15 is connected to the first RF source 11, the second RF source 12, and the third RF source 13 via a signal mixing circuit 14. The signal mixing circuit 14 mixes the first RF signal, the second RF signal, and the third RF signal to obtain a first mixed signal. The first phase modulator 15 modulates the first laser signal based on the first mixed signal to obtain a first optical frequency comb.

[0044] The input end of the second phase modulator 16 is connected to the first RF source and the second RF source through the signal mixing circuit 14. The signal mixing circuit 14 mixes the first RF signal and the second RF signal to obtain a second mixed signal. The second phase modulator 16 modulates the second laser signal based on the second mixed signal to obtain a second optical frequency comb. The first laser signal and the second laser signal have the same frequency.

[0045] The input end of the optical combiner 17 is connected to the output ends of the first phase modulator 15 and the second phase modulator 16 respectively to combine the first optical frequency comb and the second optical frequency comb. The output end of the optical combiner 17 outputs the target optical frequency comb.

[0046] In this embodiment, the signal mixing circuit 14 can mix the three RF signals by addition, multiplication, phase shifting, etc. to obtain a first mixed signal, and mix the first RF signal and the second RF signal to obtain a second mixed signal. The signals from the three RF sources are mixed to drive a first phase modulator, which is equivalent to the three RF signals driving three phase modulators connected in series. Each phase modulator undergoes a corresponding convolution with the comb line, resulting in a first optical frequency comb with a larger number of comb lines. The signals from the two RF sources are mixed to drive a second phase modulator, resulting in a second optical frequency comb with fewer comb lines than the first. By selecting appropriate signal frequency and amplitude, the power of the middle comb line of the first optical frequency comb can be made lower than the comb lines at both ends, the power of the second optical frequency comb is concentrated in the middle position, and the peak values ​​of the comb lines of the second optical frequency comb near the center frequency are approximately equal to the peak values ​​of the comb lines on both sides of the first optical frequency comb. In addition, the first phase modulator and the second phase modulator modulate the laser signals of the same frequency so that the middle comb lines of the first optical frequency comb and the second optical frequency comb can completely overlap. Combining the first optical frequency comb and the second optical frequency comb is to add the powers of the comb lines one by one. After the addition, the powers of the comb lines of the target optical frequency comb are similar, and it has multiple comb lines and high flatness.

[0047] In one possible implementation, the signal mixing circuit 14 includes a multiplier;

[0048] Two input terminals of the multiplier are connected to the first RF source 11 and the second RF source 12 respectively, and an output terminal of the multiplier is connected to an input terminal of the second phase modulator 16 .

[0049] In this embodiment, the second mixed signal is generated by multiplying the first and second RF signals. This multiplied second mixed signal drives the second phase modulator, which is equivalent to the two signals driving two phase modulators connected in series. When the frequencies of the first and second RF signals are 5 GHz and 10 GHz, respectively, and the amplitudes are 1.8 V and 1 V, respectively, the values ​​of the various orders of the Bessel functions are similar, resulting in the peak powers of the nine comb lines near the center frequency being approximately equal and higher than the peak powers of the comb lines on either side.

[0050] In one possible implementation, the signal mixing circuit 14 further includes a one-to-two electrical power splitter;

[0051] The input end of the one-to-two electrical power splitter is connected to the output end of the multiplier, the first output end is connected to the input end of the first phase modulator 15 , and the second output end is connected to the input end of the second phase modulator 16 .

[0052] In this embodiment, the second mixed signal is split into two identical paths by a one-to-two electrical power splitter, which are input to the first phase modulator and the second phase modulator, respectively. Signal mixing circuit 14 can add the third RF signal to the second mixed signal to generate the first mixed signal, eliminating the need to remultiply the first and second RF signals, further simplifying the circuit structure.

[0053] In a possible implementation, the signal mixing circuit 14 further includes an adder;

[0054] The first input end of the adder is connected to the third RF source 13 , the second input end is connected to the second output end of the one-to-two electrical power splitter, and the output end is connected to the input end of the second phase modulator 16 .

[0055] In this embodiment, the adder adds the second mixed signal and the third RF signal to generate the first mixed signal, which is equivalent to multiplying the first RF signal by the second RF signal and then adding the signal to the third RF signal to generate the first mixed signal. This first mixed signal can generate a first optical frequency comb with 45 comb lines when the frequencies of the first, second, and third RF signals are 5 GHz, 10 GHz, and 45 GHz, respectively, and the amplitudes are 1.8 V, 1 V, and 1.675 V, respectively.

[0056] In one possible implementation, it also includes a laser and a one-to-two optical power splitter; the laser is connected to the input end of the one-to-two optical power splitter, the first output end of the one-to-two optical power splitter is connected to the input end of the first phase modulator 15, and the second output end of the one-to-two optical power splitter is connected to the input end of the second phase modulator 16.

[0057] In this embodiment, the laser signal emitted by the laser is split into two identical signals by a one-to-two optical power splitter, and the signals are input into the first phase modulator 15 and the second phase modulator 16, respectively. In this way, only one laser source is required to generate an optical frequency comb using two phase modulators, and the laser signals used by the two phase modulators are ensured to have exactly the same signal frequency, so that the comb lines of the first optical frequency comb and the second optical frequency comb are completely aligned, thereby obtaining a more ideal target optical frequency comb.

[0058] In a possible implementation, the frequency ratio of the first radio frequency signal, the second radio frequency signal, and the third radio frequency signal is 1:2:9, and the amplitude ratio is 1.8:1:1.675.

[0059] In this embodiment, the frequency and amplitude of each RF signal will affect the comb line spacing and comb line peak power of the target optical frequency comb. By proportionally adjusting the frequencies of the three RF signals, the comb line spacing can be flexibly adjusted.

[0060] In a specific embodiment, see Figure 2 , where 1 is a laser, 2 is an optical power splitter, 3 is the first RF source, 4 is the second RF source, 5 is a multiplier, 6 is an electrical power splitter, 7 is the third RF source, 8 is an adder, 9 is an upper branch phase modulator, 10 is a lower branch phase modulator, 11 is an optical power combiner, and 12 is a test device.

[0061] The optical signal emitted by the laser is split into two paths by an optical power splitter and fed into two parallel upper and lower branch phase modulators, respectively. The RF signal from the first RF source is multiplied by the RF signal from the second RF source and then split into two paths by an electrical power splitter. One path is then added to the RF signal from the third RF source, achieving a three-path mixing of the RF signals to drive the upper branch phase modulator, generating an optical frequency comb with a large number of comb lines. This is equivalent to multiple RF signals driving separate phase modulators in series. Therefore, performing multi-RF signal operations in the highly mature electrical domain can effectively simplify the optical domain system structure, thereby reducing system implementation costs and overall complexity.

[0062] By adjusting the amplitudes and corresponding frequencies of the three RF signals, that is, the frequencies of the RF signals emitted by the first RF source, the RF signals emitted by the second RF source, and the RF signals emitted by the third RF source are 5GHz, 10GHz, and 45GHz, respectively, and the amplitudes are 1.8V, 1V, and 1.675V, respectively, an optical frequency comb with 45 comb lines can be generated in the upper branch. However, the peak power of the middle 9 comb lines is lower than that of the surrounding 36 comb lines, resulting in poor overall flatness. Figure 3 shown.

[0063] The three RF signals mix and drive the upper branch phase modulator, which is equivalent to the three RF signals driving three phase modulators in series. Each comb line undergoes corresponding convolution after passing through a phase modulator, thereby increasing the number of comb lines. However, the amplitude values ​​of the three RF signals cause the value of the 0th-order Bessel function to be too low, resulting in the peak power of the nine comb lines near the center frequency being lower than the power of the surrounding comb lines.

[0064] In order to improve the overall flatness of the optical frequency comb with 45 comb lines, the RF signal emitted by the first RF source is multiplied by the RF signal emitted by the second RF source and the other RF signal after branching can be used to directly drive the lower branch phase modulator to generate an optical frequency comb with 9 comb lines, such as Figure 4As shown in the figure, the two RF signals are mixed and drive the lower branch phase modulator, which is equivalent to the two RF signals driving two phase modulators in series. Similar to the upper branch, the two RF signals are modulated by the phase modulator to achieve comb line convolution. When the frequencies of the RF signals emitted by the first RF source and the second RF source are 5 GHz and 10 GHz, respectively, and the amplitudes are 1.8 V and 1 V, respectively, the values ​​of the Bessel functions of each order are similar, ultimately making the peak powers of the nine comb lines near the center frequency approximately equal and higher than the peak powers of the surrounding comb lines.

[0065] The upper and lower branch phase modulators are driven separately after the laser signal output by the same laser is evenly divided by the optical power splitter, that is, the center frequencies of the laser signals in the upper and lower branch phase modulators are equal, so the 9 optical frequency comb lines generated by the lower branch phase modulator can completely correspond to the middle 9 comb lines of the 45 comb lines generated by the upper branch phase modulator. Subsequently, the optical signals output by the upper and lower branch phase modulators are combined by the optical power combiner. During the combining process, the 9 comb lines generated by the lower branch phase modulator are superimposed on the 45 optical frequency combs output by the upper branch phase modulator, so that the peak powers of the 45 comb lines in the superimposed optical frequency comb are approximately equal. Since the peak power of the far-end comb line is too low, even after the upper and lower branches are superimposed, it will not reach the level of the peak power of the middle 45 comb lines, thereby finally obtaining an optical frequency comb with high flatness and a large number of comb lines, such as Figure 5 As shown, the test equipment then conducted performance observations. When the frequencies of the RF signals emitted by the first, second, and third RF sources were 5 GHz, 10 GHz, and 45 GHz, respectively, and their amplitudes were 1.8 V, 1 V, and 1.675 V, respectively, a high-performance optical frequency comb with 45 comb lines, 5 GHz line spacing, a side mode suppression ratio of 5.79 dB, and a flatness of 0.87 dB was generated.

[0066] See also Figure 6 , which shows a flow chart of an implementation method of a control method for an optical frequency comb generation system provided by an embodiment of the present invention, and is described in detail as follows:

[0067] Step 601, obtaining the comb line spacing of the target optical frequency comb;

[0068] Step 602, determining the frequency of each radio frequency signal based on the comb line spacing;

[0069] Step 603 : Setting parameters of each radio frequency source based on each frequency to modulate the first laser signal and the second laser signal to obtain a target optical frequency comb.

[0070] In one possible implementation, determining the frequency of each radio frequency signal based on the comb line spacing includes:

[0071] X is used as the frequency of the first RF signal, 2X is used as the frequency of the second RF signal, and 9X is used as the frequency of the third RF signal; wherein X is the comb line spacing.

[0072] In this embodiment, the frequencies of the first RF signal, the second RF signal, and the third RF signal are adjusted in a ratio of 1:2:9, so that the line spacing of the optical frequency comb can be flexibly adjusted and the flatness of the optical frequency comb can be ensured.

[0073] It should be understood that the size of the serial numbers of the steps in the above embodiments does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

[0074] The following are device embodiments of the present invention. For details not fully described therein, reference may be made to the corresponding method embodiments described above.

[0075] Figure 7 A schematic diagram of the structure of a control device for an optical frequency comb generation system according to an embodiment of the present invention is shown. For ease of explanation, only the portion relevant to the embodiment of the present invention is shown, which is described in detail as follows:

[0076] like Figure 7 As shown, the control device 7 of the optical frequency comb generation system includes:

[0077] An acquisition module 71 is used to acquire the comb line spacing of a target optical frequency comb;

[0078] a calculation module 72 for determining the frequency of each RF signal based on the comb line spacing;

[0079] The setting module 73 is used to set the parameters of each radio frequency source based on each frequency, so as to modulate the first laser signal and the second laser signal to obtain a target optical frequency comb.

[0080] In a possible implementation, the calculation module 72 is specifically configured to:

[0081] X is used as the frequency of the first RF signal, 2X is used as the frequency of the second RF signal, and 9X is used as the frequency of the third RF signal; wherein X is the comb line spacing.

[0082] Figure 8 FIG is a schematic diagram of an optical frequency comb generating device provided by an embodiment of the present invention. Figure 8 As shown, the optical frequency comb generating device 8 of this embodiment includes: a processor 80, a memory 81, and a computer program 82 stored in the memory 81 and executable on the processor 80. When the processor 80 executes the computer program 82, the steps in the above-mentioned control method embodiments of the optical frequency comb generating system are implemented, such as Figure 6Alternatively, when the processor 80 executes the computer program 82, the functions of the modules / units in the above-mentioned device embodiments are realized, for example, Figure 7 Functions of the modules / units 71 to 73 shown.

[0083] Exemplarily, the computer program 82 may be divided into one or more modules / units, which are stored in the memory 81 and executed by the processor 80 to implement the present invention. The one or more modules / units may be a series of computer program instruction segments capable of implementing specific functions, which are used to describe the execution process of the computer program 82 in the optical frequency comb generating device 8. For example, the computer program 82 may be divided into Figure 7 Modules / units 71 to 73 are shown.

[0084] The optical frequency comb generating device 8 can be a computing device such as a desktop computer, a notebook, a PDA, or a cloud server. The optical frequency comb generating device 8 can include, but is not limited to, a processor 80 and a memory 81. It will be understood by those skilled in the art that Figure 8 It is only an example of the optical frequency comb generating device 8 and does not constitute a limitation of the optical frequency comb generating device 8. It may include more or fewer components than shown in the figure, or a combination of certain components, or different components. For example, the optical frequency comb generating device may also include input and output devices, network access devices, buses, etc.

[0085] The processor 80 may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or any conventional processor.

[0086] The memory 81 can be an internal storage unit of the optical frequency comb generating device 8, such as a hard drive or memory of the optical frequency comb generating device 8. The memory 81 can also be an external storage device of the optical frequency comb generating device 8, such as a plug-in hard drive, a smart media card (SMC), a secure digital (SD) card, a flash memory card, etc. equipped on the optical frequency comb generating device 8. Furthermore, the memory 81 can include both an internal storage unit of the optical frequency comb generating device 8 and an external storage device. The memory 81 is used to store the computer program and other programs and data required by the optical frequency comb generating device. The memory 81 can also be used to temporarily store data that has been output or is about to be output.

[0087] Those skilled in the art can clearly understand that, for the convenience and brevity of description, only the division of the above-mentioned functional units and modules is used as an example for illustration. In actual applications, the above-mentioned functions can be distributed and completed by different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiment can be integrated into one processing unit, or each unit can exist physically alone, or two or more units can be integrated into one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of software functional units. In addition, the specific names of the functional units and modules are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of this application. The specific working process of the units and modules in the above-mentioned system can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here.

[0088] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant description of other embodiments.

[0089] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the present invention.

[0090] In the embodiments provided by the present invention, it should be understood that the disclosed devices / terminals and methods can be implemented in other ways. For example, the device / terminal embodiments described above are merely illustrative. For example, the division of the modules or units is merely a logical functional division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed can be through some interface, indirect coupling or communication connection of devices or units, and can be electrical, mechanical, or other forms.

[0091] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0092] In addition, the functional units in the various embodiments of the present invention may be integrated into a single processing unit, each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or software functional units.

[0093] If the integrated module / unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the present invention implements all or part of the processes in the above-mentioned embodiment method, and can also be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium. When the computer program is executed by the processor, it can implement the steps of the above-mentioned control method embodiments of each optical frequency comb generation system. The computer program includes computer program code, which can be in source code form, object code form, executable file or some intermediate form. The computer-readable medium may include: any entity or device that can carry the computer program code, recording medium, USB flash drive, mobile hard disk, magnetic disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signal, telecommunication signal and software distribution medium. It should be noted that the content contained in the computer-readable medium can be appropriately increased or decreased according to the requirements of legislation and patent practices in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practices, computer-readable media does not include electrical carrier signals and telecommunication signals.

[0094] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention, and should all be included in the scope of protection of the present invention.

Claims

1. An optical frequency comb generation system, characterized in that: The invention comprises a first radio frequency source, a second radio frequency source, a third radio frequency source, a signal mixing circuit, a first phase modulator, a second phase modulator and an optical combiner; the first radio frequency source, the second radio frequency source and the third radio frequency source respectively emit a first radio frequency signal, a second radio frequency signal and a third radio frequency signal; the frequency ratio of the first radio frequency signal, the second radio frequency signal and the third radio frequency signal is 1:2:9, and the amplitude ratio is 1.8:1:1.675; An input end of the first phase modulator is connected to the first RF source, the second RF source, and the third RF source through the signal mixing circuit. The signal mixing circuit mixes the first RF signal, the second RF signal, and the third RF signal to obtain a first mixed signal. The first phase modulator modulates the first laser signal based on the first mixed signal to obtain a first optical frequency comb. An input end of the second phase modulator is connected to the first RF source and the second RF source through the signal mixing circuit. The signal mixing circuit mixes the first RF signal and the second RF signal to obtain a second mixed signal. The second phase modulator modulates the second laser signal based on the second mixed signal to obtain a second optical frequency comb. The first laser signal and the second laser signal have the same frequency. The input end of the optical combiner is connected to the output ends of the first phase modulator and the second phase modulator respectively to combine the first optical frequency comb and the second optical frequency comb, and the output end of the optical combiner outputs the target optical frequency comb.

2. The optical frequency comb generation system according to claim 1, wherein: The signal mixing circuit includes a multiplier, a one-to-two electric power splitter and an adder. The two input ends of the multiplier are respectively connected to the first RF source and the second RF source, and the output end is connected to the input end of the one-to-two electric power splitter. The first output end of the one-to-two electric power splitter is connected to the input end of the second phase modulator. The first input end of the adder is connected to the third RF source. The second output end of the one-to-two electric power splitter is connected to the second input end of the adder. The output end of the adder is connected to the input end of the first phase modulator.

3. The optical frequency comb generation system according to claim 1, wherein: It also includes a laser and a one-to-two optical power splitter; the laser is connected to the input end of the one-to-two optical power splitter, the first output end of the one-to-two optical power splitter is connected to the input end of the first phase modulator, and the second output end of the one-to-two optical power splitter is connected to the input end of the second phase modulator.

4. A control method for the optical frequency comb generation system according to any one of claims 1 to 3, characterized in that: The control method includes: Obtain the comb line spacing of the target optical frequency comb; determining the frequency of each radio frequency signal based on the comb line spacing; Parameters of each radio frequency source are set based on each frequency to modulate the first laser signal and the second laser signal to obtain a target optical frequency comb.

5. A control device for the optical frequency comb generation system according to any one of claims 1 to 3, characterized in that: The control device comprises: An acquisition module, used to obtain the comb line spacing of the target optical frequency comb; a calculation module, configured to determine the frequency of each radio frequency signal based on the comb line spacing; The setting module is used to set the parameters of each radio frequency source based on each frequency to modulate the first laser signal and the second laser signal to obtain a target optical frequency comb.

6. An optical frequency comb generating device, comprising the optical frequency comb generating system according to any one of claims 1 to 3, a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the computer program, the steps of the method according to claim 4 are implemented.

7. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the steps of the method according to claim 4 are implemented.

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