Control method, device, equipment, system, medium and product of light modulation system

Abstract

The application relates to a control method, device, equipment, system, medium and product of a light modulation system. The method comprises the following steps: in a non-pulse modulation period, controlling a light modulator to perform preset modulation on incident light, obtaining a detection electric signal corresponding to a preset-modulated light signal through a photoelectric detector, and controlling the light modulator through a corresponding stable control parameter according to the detection electric signal and a preset stable reference value, so that the intensity value of the detection electric signal approaches the preset stable reference value, and one or more time instants of stable control parameters in the non-pulse modulation period are obtained; when entering a pulse modulation period, determining a target stable control parameter according to the one or more time instants of stable control parameters in the non-pulse modulation period, and controlling the light modulator to perform pulse modulation on the incident light through the target stable control parameter. The method can obtain a better stable effect of pulse light, and a pulse light signal with stable intensity is obtained.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of optical pulse technology, and in particular to a control method, device, equipment, system, storage medium and computer program product of an optical modulation system. BACKGROUND

[0002] With the development of optical pulse technology, pulse optical signals are widely used in quantum state regulation, optical communication, material processing and other fields.

[0003] Among them, for the field with high precision requirements such as quantum state regulation, the pulse width, light intensity and other parameters of the pulse optical signal are usually strictly required, and the more stable the light intensity of the pulse optical signal is, the higher the precision it can achieve is.

[0004] At present, the intensity stability control of the pulse optical signal is generally to directly track the optical power of the pulse optical signal in real time, and then adjust its intensity. However, since the pulse optical signal usually has a short pulse width, the intensity stability process of the real-time tracking is often difficult to obtain a better stability effect, and even the optical power fluctuation is too large. SUMMARY

[0005] Therefore, it is necessary to provide a control method, device, control equipment, computer readable storage medium and computer program product of an optical modulation system to solve the above technical problems.

[0006] In a first aspect, the present application provides a control method of an optical modulation system. The method comprises:

[0007] In a non-pulse modulation period, a light modulator is controlled to perform a preset modulation on incident light, a detection electric signal corresponding to the preset modulated optical signal is obtained by a photodetector, and according to the detection electric signal and a preset stable reference value, the light modulator is controlled by a corresponding stable control parameter, so that the intensity value of the detection electric signal tends to the preset stable reference value, and the stable control parameter at one or more time points in the non-pulse modulation period is obtained.

[0008] When entering a pulse modulation period, the target stable control parameter is determined according to the stable control parameter at one or more time points in the non-pulse modulation period, and the light modulator is controlled to perform pulse modulation on the incident light by the target stable control parameter.

[0009] In one of the embodiments, the determining the target stable control parameter according to the stable control parameter at one or more time points in the non-pulse modulation period, and controlling the optical modulator to pulse-modulate the incident light by using the target stable control parameter, comprises: determining the stable control parameter at the time point closest to the pulse modulation period as the target stable control parameter; and controlling the optical modulator to pulse-modulate the incident light according to the target stable parameter.

[0010] In one of the embodiments, the stable control parameter comprises an intensity value of the electrical signal acting on the optical modulator; the controlling the optical modulator to perform the preset modulation on the incident light comprises: generating the electrical signal acting on the optical modulator to make the optical modulator perform the preset modulation on the incident light; and the controlling the optical modulator according to the detection electrical signal and the preset stable reference value by using the corresponding stable control parameter comprises: using the proportional integral method to obtain the stable control parameter corresponding to the current time point according to the detection electrical signal and the preset stable reference value; and making the electrical signal acting on the optical modulator have the corresponding intensity value according to the stable control parameter.

[0011] In one of the embodiments, the method further comprises: in the configuration stage of the preset stable reference value, controlling the optical modulator to perform configuration modulation on the incident light; and controlling the optical modulator according to the optical power value of the configuration-modulated optical signal received by the optical power meter from the optical beam splitter and the target optical power value, so that the optical power value is the same as the target optical power value; the optical beam splitter is configured to split the configuration-modulated optical signal to the optical power meter and the photodetector; and when the optical power value is the same as the target optical power value, the detection electrical signal of the photodetector is set as the preset stable reference value.

[0012] In a second aspect, the application further provides a control device of an optical modulation system. The device comprises:

[0013] a non-pulse modulation module configured to control the optical modulator to perform preset modulation on the incident light when in a non-pulse modulation period, obtain a detection electrical signal corresponding to the preset-modulated optical signal by using the photodetector, control the optical modulator according to the detection electrical signal and a preset stable reference value by using a corresponding stable control parameter, so that the intensity value of the detection electrical signal approaches the preset stable reference value, and obtain the stable control parameter at one or more time points in the non-pulse modulation period;

[0014] a pulse modulation module configured to determine a target stable control parameter according to the stable control parameter at one or more time points in the non-pulse modulation period when in a pulse modulation period, and control the optical modulator to pulse-modulate the incident light by using the target stable control parameter.

[0015] In a third aspect, the application further provides a control device of an optical modulation system. The control device comprises a memory and a processor, the memory stores a computer program, and the processor implements the following steps when executing the computer program:

[0016] In the non-pulse modulation period, the light modulator is controlled to perform preset modulation on the incident light, a detection electrical signal corresponding to the light signal subjected to the preset modulation is obtained by the photodetector, and the light modulator is controlled by a corresponding stable control parameter according to the detection electrical signal and a preset stable reference value, so that the intensity value of the detection electrical signal tends to approach the preset stable reference value, and the stable control parameter at one or more time points in the non-pulse modulation period is obtained.

[0017] In the pulse modulation period, the target stable control parameter is determined according to the stable control parameter at one or more time points in the non-pulse modulation period, and the light modulator is controlled by the target stable control parameter to perform pulse modulation on the incident light.

[0018] In a fourth aspect, the application further provides an optical modulation system, which comprises a light modulator, a light beam splitter, a photodetector, and a control device of the optical modulation system; the light modulator is used to modulate incident light under the control of the control device of the optical modulation system; the light beam splitter is used to split the light signal from the light modulator to the photodetector; the photodetector is used to convert the light signal split from the light beam splitter into a detection electrical signal, and transmit the detection electrical signal to the control device.

[0019] In one of the embodiments, the system further comprises a light shutter and a driving device; the driving device is used to drive the light shutter to be closed to block the light signal split from the light beam splitter in the non-pulse modulation period, and to be opened to conduct the light signal split from the light beam splitter in the pulse modulation period, under the control of the control device.

[0020] In one of the embodiments, the control device comprises a host computer, a signal generator, a power amplifier, a voltage attenuator, and a controller; the signal generator is used to generate a first electrical signal under the control of the host computer, and transmit a second electrical signal to the voltage attenuator through the power amplifier; the controller is used to control the voltage attenuator under the control of the host computer; the voltage attenuator is used to adjust the second electrical signal to obtain an electrical signal and control the light modulator under the control of the controller.

[0021] In one of the embodiments, the system further comprises a reflection assembly; the reflection assembly is used to output the light signal to the light beam splitter after the light signal experiences multiple modulations in the light modulator.

[0022] In a fourth aspect, the present application also provides a computer readable storage medium. The computer readable storage medium has a computer program stored thereon, and the computer program, when executed by a processor, implements the following steps:

[0023] In the non-pulse modulation period, the light modulator is controlled to perform preset modulation on the incident light, a detection electric signal corresponding to the preset modulated light signal is obtained by the photodetector, and the light modulator is controlled by a corresponding stable control parameter according to the detection electric signal and a preset stable reference value, so that the intensity value of the detection electric signal approaches the preset stable reference value, and the stable control parameter at one or more time points in the non-pulse modulation period is obtained.

[0024] In the pulse modulation period, the target stable control parameter is determined according to the stable control parameter at one or more time points in the non-pulse modulation period, and the light modulator is controlled by the target stable control parameter to perform pulse modulation on the incident light.

[0025] In a fifth aspect, the present application also provides a computer program product. The computer program product comprises a computer program, and the computer program, when executed by a processor, implements the following steps:

[0026] In the non-pulse modulation period, the light modulator is controlled to perform preset modulation on the incident light, a detection electric signal corresponding to the preset modulated light signal is obtained by the photodetector, and the light modulator is controlled by a corresponding stable control parameter according to the detection electric signal and a preset stable reference value, so that the intensity value of the detection electric signal approaches the preset stable reference value, and the stable control parameter at one or more time points in the non-pulse modulation period is obtained.

[0027] In the pulse modulation period, the target stable control parameter is determined according to the stable control parameter at one or more time points in the non-pulse modulation period, and the light modulator is controlled by the target stable control parameter to perform pulse modulation on the incident light.

[0028] The control method, device, control equipment, storage medium and computer program product of the light modulation system, by controlling the light modulator to perform preset modulation on the incident light during the non-pulse modulation period, and by the photodetector to obtain the detection electrical signal corresponding to the preset modulated light signal, and by the preset stable reference value and the detection electrical signal, the light modulator is controlled by the corresponding stable control parameter to make the intensity value of the detection electrical signal close to the preset stable reference value; then during the pulse modulation period, the target stable control parameter is determined according to the stable control parameter at one or more moments in the non-pulse modulation period, and the light modulator is controlled by the target stable control parameter to perform pulse modulation on the incident light. The method controls the continuous light signal in the non-pulse modulation period to obtain the stable control parameter, and then uses the stable control parameter to modulate the pulse light signal in the pulse modulation period, which effectively avoids the situation that it is difficult to obtain good stable effect due to the short pulse width of the light signal when directly controlling the pulse light signal, and is conducive to generating intensity-stable pulse light signals. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 Flowchart of the control method of the light modulation system in one embodiment;

[0030] Figure 2 Application environment diagram of the control method of the light modulation system in one embodiment;

[0031] Figure 3 Application environment diagram of the control method of the light modulation system in another embodiment;

[0032] Figure 4 Structure block diagram of the control device of the light modulation system in one embodiment;

[0033] Figure 5 Internal structure diagram of the control equipment in one embodiment;

[0034] Figure 6 Structure diagram of the light modulation system in one embodiment;

[0035] Figure 7 Structure diagram of the light modulation system in another embodiment;

[0036] Figure 8 Structure diagram of the light modulation system in another embodiment;

[0037] Figure 9 Structure diagram of the light modulation system in another embodiment;

[0038] Figure 10 Structure diagram of the light modulation system in another embodiment;

[0039] Figure 11This is a schematic diagram of timing control signals in one embodiment. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0041] In one embodiment, such as Figure 1 As shown, a control method for an optical modulation system is provided. In this embodiment, this method is applied to, for example,... Figure 2 The control device of the optical modulation system shown is illustrated as an example. In this embodiment, the method includes the following steps:

[0042] In step S101, during a non-pulse modulation period, the optical modulator is controlled to perform preset modulation on the incident light. The photodetector obtains the detection electrical signal corresponding to the preset modulated optical signal. Based on the detection electrical signal and the preset stable reference value, the optical modulator is controlled by the corresponding stable control parameters to make the intensity value of the detection electrical signal approach the preset stable reference value, thereby obtaining stable control parameters for one or more moments within the non-pulse modulation period.

[0043] Specifically, in this optical modulation system, the incident light can be a continuous laser, the optical modulator can be an acousto-optic modulator, and the photodetector can generate an electrical signal with a corresponding intensity value based on the intensity of the received optical signal. A preset stable reference value can be stored in the control device, which can be the intensity value that the detection electrical signal generated by the photodetector should reach when the preset modulated optical signal reaches the set stable intensity.

[0044] In this step, the control device sends a control signal to the optical modulator to control the optical modulator to perform preset modulation on the incident light. This control signal enables the optical modulator to modulate the incident light into a continuous optical signal with a certain intensity and frequency.

[0045] Further, the control device can compare the intensity of the detection electrical signal received from the photodetector with the pre-stored preset stable reference value at multiple time points in the non-pulse modulation period, and obtain corresponding stable control parameters according to the comparison results, and control the light modulator according to the stable control parameters. The stable control parameters can have various forms, for example, can be parameters for forming a control signal, or parameters for adjusting the current control signal, which are not limited herein. The control device controls the light modulator according to the stable control parameters, which can adjust the preset modulation, so that the intensity of the light signal subjected to the preset modulation is adjusted accordingly, and is closer to the set stable intensity. Further, after the light modulator is controlled by the stable control parameters, the intensity value of the detection electrical signal tends to approach the preset stable reference value.

[0046] For example, at a certain time point, it is confirmed that the intensity of the detection electrical signal is equal to the preset stable reference value, or only has a difference less than a set tolerance, after the comparison, then the corresponding stable control parameter can be a parameter for the control device to continue sending the current control signal; for example, after the comparison, it is determined that the intensity of the detection electrical signal is less than the preset stable reference value, then the corresponding stable control parameter can be a parameter for the control device to generate a control signal capable of making the light signal subjected to the preset modulation have a higher intensity.

[0047] According to the above method, the intensity of the detection electrical signal is compared with the preset stable reference value at one or more time points, and one or more corresponding stable control parameters are obtained.

[0048] In step S102, when entering the pulse modulation period, the target stable control parameter is determined according to the stable control parameters at one or more time points in the non-pulse modulation period, and the light modulator is controlled by the target stable control parameter to pulse modulate the incident light.

[0049] Specifically, in this step, the light modulator can determine the target stable control parameter from the stable control parameters obtained in the non-pulse modulation period. In some embodiments, for the case of only one stable control parameter, the stable control parameter can be used as the corresponding target stable control parameter; and for the case of multiple time points corresponding to stable control parameters, the target stable control parameter can be the stable control parameter that can make the intensity value of the detection electrical signal closest to the preset stable reference value. In other embodiments, a new stable control parameter that can make the intensity value of the detection electrical signal closer to the preset stable reference value can be calculated according to one or more stable control parameters obtained in the non-pulse modulation period, and the new stable control parameter is used as the target stable control parameter.

[0050] Further, the control device can control the light modulator to pulse-modulate the incident light according to the obtained target stable control parameter, so as to obtain a pulse light signal with light intensity close to the stable intensity.

[0051] The control method of the light modulation system can control the light modulator to pre-set modulate the incident light during the non-pulse modulation period, obtain a detection electric signal corresponding to the pre-set modulated light signal through the photodetector, control the light modulator according to the detection electric signal and the pre-set stable reference value through the corresponding stable control parameter, so as to make the intensity value of the detection electric signal close to the pre-set stable reference value; then, during the pulse modulation period, the target stable control parameter is determined according to the stable control parameter at one or more time points in the non-pulse modulation period, and the light modulator is controlled to pulse-modulate the incident light according to the target stable control parameter. The method can control the continuous light signal during the non-pulse modulation period to obtain the stable control parameter, and then use the stable control parameter to modulate the pulse light signal during the pulse modulation period, so as to effectively avoid the situation that it is difficult to obtain a good stable effect due to the short pulse width of the light signal when directly controlling the pulse light signal, and it is beneficial to generate a pulse light signal with stable intensity.

[0052] In one embodiment, the target stable control parameter is determined according to the stable control parameter at one or more time points in the non-pulse modulation period, and the light modulator is controlled to pulse-modulate the incident light through the target stable control parameter in the step S101, including: determining the stable control parameter at the time point closest to the pulse modulation period as the target stable control parameter among the stable control parameters at one or more time points in the non-pulse modulation period; and controlling the light modulator to pulse-modulate the incident light according to the target stable parameter.

[0053] Specifically, for the stable control parameters at one or more time points in the non-pulse modulation period, each stable control parameter can make the intensity value of the detection electric signal close to the pre-set stable reference value, so that in the non-pulse period, whether the intensity value of the detection electric signal is equal to the pre-set stable reference value or not, the stable control parameter corresponding to the latest time point, i.e., the time point closest to the pulse modulation period, can make the intensity value of the detection electric signal closest to the pre-set stable reference value.

[0054] Controlling the light modulator to pulse-modulate the incident light with the stable control parameter as the target stable control parameter can make the intensity of the pulse light signal modulated by the light modulator closest to the set stable intensity.

[0055] The embodiment can directly take the stable control parameter of the time point closest to the pulse modulation period in the non-pulse modulation period as the target stable control parameter, which can avoid further calculation on the existing stable control parameter, and improve the determination efficiency of the target stable control parameter.

[0056] In one embodiment, the stable control parameter includes an intensity value of the electrical signal acting on the optical modulator; the method of controlling the optical modulator to perform the preset modulation on the incident light includes: generating the electrical signal acting on the optical modulator to make the optical modulator perform the preset modulation on the incident light; and controlling the optical modulator according to the corresponding stable control parameter based on the detection electrical signal and the preset stable reference value, which includes: using a proportional integral method to obtain the stable control parameter corresponding to the current time point based on the detection electrical signal and the preset stable reference value; and making the electrical signal acting on the optical modulator have the corresponding intensity value based on the stable control parameter.

[0057] Specifically, the control device in the embodiment can generate the electrical signal acting on the optical modulator to control the optical modulator through the electrical signal. The intensity value of the electrical signal can control the intensity of the modulated light signal output by the optical modulator.

[0058] In the multiple time points in the non-pulse modulation period, the control device uses a proportional integral method to obtain the stable control parameter corresponding to the current time point based on the detection electrical signal intensity of the current time point and multiple historical time points in the non-pulse modulation period, and the preset stable reference value. The stable control parameter includes the intensity value of the electrical signal, and the control device can generate the electrical signal with the corresponding intensity value based on the stable control parameter, and further make the optical modulator output the modulated light signal with the corresponding intensity.

[0059] The embodiment uses a proportional integral method to obtain the stable control parameter in the non-pulse modulation period, which can track and monitor the intensity of the modulated light signal in real time, and adjust the control of the optical modulator in real time, which is conducive to further reducing the power fluctuation in the optical stable control process.

[0060] In one embodiment, the method further includes the steps of: in the configuration stage of the preset stable reference value, controlling the optical modulator to perform configuration modulation on the incident light; and controlling the optical modulator based on the optical power value of the configured modulated light signal received by the optical power meter from the optical beam splitter and the target optical power value, so that the optical power value is the same as the target optical power value; the optical beam splitter is used to split the configured modulated light signal to the optical power meter and the photodetector; and when the optical power value is the same as the target optical power value, the detection electrical signal of the photodetector is set as the preset stable reference value.

[0061] Specifically, the method can be applied to, for example,Figure 3 The modulated light signal output by the light modulator is split by the optical splitter into a first light signal reaching the optical power meter and a second light signal reaching the photodetector.

[0062] In this embodiment, the control device controls the light modulator to configure modulate the incident light to obtain a configured modulated continuous light signal with a certain frequency and intensity value. Further, the first light signal output by the optical splitter is used as the final output light signal of the light modulation system, and the optical power meter is used to obtain the optical power value of the first light signal.

[0063] The control device compares the optical power value obtained by the optical power meter with the target optical power value. If they are the same, the intensity value of the detection electrical signal obtained by the photodetector at this time is recorded as the preset stable reference value. If they are not the same, the light modulator is controlled to adjust the configuration modulation of the incident light until the optical power value of the first light signal is the same as the target optical power value, and the intensity value of the detection electrical signal obtained by the photodetector at this time is recorded as the preset stable reference value. The target optical power value can be determined according to the specific application scenario of the pulsed light signal output by the light modulator system.

[0064] In this embodiment, the light output by the light modulator is split by the optical splitter, which can simultaneously generate a light signal for external output and a light signal for monitoring and adjustment. The light modulator is controlled according to the intensity of the light signal for external output, which can obtain a preset stable reference value that can more accurately reflect the target optical power value, and is more conducive to reducing errors in subsequent stable control in the non-pulse modulation period and the pulse modulation period.

[0065] It should be understood that although each step in the flowchart involved in each of the above embodiments is shown in sequence according to the arrow, these steps are not necessarily executed in sequence according to the arrow. Unless otherwise stated herein, the execution of these steps is not strictly limited in sequence, and these steps can be executed in other sequences. Moreover, at least part of the steps in the flowchart involved in each of the above embodiments can include multiple steps or stages, which are not necessarily executed at the same time, but can be executed at different times, and the execution sequence of these steps or stages is not necessarily sequential, but can be executed alternately or alternately with at least part of other steps or steps or stages in other steps.

[0066] Based on the same inventive concept, the embodiment of the present application further provides a control device of the optical modulation system for implementing the control method of the optical modulation system. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme described in the above method, and therefore the specific limitations in one or more control device embodiments of the optical modulation system provided below can refer to the limitations of the control method of the optical modulation system described above, and will not be described here again.

[0067] In one embodiment, as shown in Figure 4 A control device 400 of the optical modulation system is provided, comprising:

[0068] The non-pulse modulation module 401 is configured to, when in a non-pulse modulation period, control the optical modulator to perform preset modulation on the incident light, obtain a detection electrical signal corresponding to the preset modulated light signal through a photodetector, and control the optical modulator through a corresponding stable control parameter according to the detection electrical signal and a preset stable reference value, so that the intensity value of the detection electrical signal tends to the preset stable reference value, and obtain the stable control parameter at one or more time points in the non-pulse modulation period.

[0069] The pulse modulation module 402 is configured to, when in a pulse modulation period, determine a target stable control parameter according to the stable control parameter at one or more time points in the non-pulse modulation period, and control the optical modulator to perform pulse modulation on the incident light through the target stable control parameter.

[0070] In one embodiment, the non-pulse modulation module 401 of the above device is further configured to determine that the stable control parameter closest to the pulse modulation period in the stable control parameters at one or more time points in the non-pulse modulation period is a target stable control parameter, and control the optical modulator to perform pulse modulation on the incident light according to the target stable parameter.

[0071] In one embodiment, the stable control parameter includes an intensity value of an electrical signal acting on the optical modulator, and the non-pulse modulation module 401 is further configured to generate an electrical signal acting on the optical modulator, so that the optical modulator performs preset modulation on the incident light, and obtain the stable control parameter corresponding to the current time point by using a proportional integral method according to the detection electrical signal and the preset stable reference value, so that the electrical signal acting on the optical modulator has a corresponding intensity value according to the stable control parameter.

[0072] In an embodiment, the apparatus further comprises a preset stable reference value configuration module configured to control the light modulator to perform configuration modulation on the incident light; and control the light modulator according to a light power value of the configuration-modulated light signal received by the optical power meter from the optical beam splitter and a target light power value, so that the light power value is the same as the target light power value; the optical beam splitter is configured to split the configuration-modulated light signal to the optical power meter and the photodetector; and when the light power value is the same as the target light power value, set the detection electrical signal of the photodetector to a preset stable reference value.

[0073] The modules in the control apparatus of the light modulation system can be implemented by software, hardware, or a combination thereof. The modules can be embedded in or independent of a processor in the control device in hardware form, or stored in a memory in the control device in software form, so as to be called and executed by the processor to perform the operations corresponding to the modules.

[0074] In an embodiment, a control device of a light modulation system is provided, which can have an internal structure as shown in Figure 5 The control device can include a processor, a memory, an input / output interface (I / O), and a communication interface. The processor, the memory, and the input / output interface are connected through a system bus, and the communication interface is connected to the system bus through the input / output interface. The processor can be configured to provide computing and control capabilities. The memory can include a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program, and a database. The internal memory provides an environment for the operating system and the computer program in the non-volatile storage medium to run. The input / output interface can be configured to exchange information between the processor and external devices. The communication interface can be configured to communicate with external devices through network connection. The computer program is executed by the processor to implement a control method of a light modulation system.

[0075] Those skilled in the art can understand that Figure 5 The structure shown in the figure is only a block diagram of part of the structure related to the scheme of the present application, and does not constitute a limitation on the control device to which the scheme of the present application is applied. The specific control device can include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0076] In an embodiment, a control device of a light modulation system is provided, which includes a memory and a processor. The memory stores a computer program, and the processor executes the computer program to implement the steps in the above method embodiments.

[0077] In an embodiment, as Figure 6As shown, a light modulation system is provided, the system comprising: a light modulator, a light beam splitter, a photodetector, and a control device of the light modulation system in the above embodiment;

[0078] a light modulator configured to modulate incident light under control of the control device of the light modulation system;

[0079] a light beam splitter configured to split the light signal from the light modulator into a first light signal and a second light signal;

[0080] a photodetector configured to convert the light signal split from the light beam splitter into a detection electrical signal, and transmit the detection electrical signal to the control device.

[0081] Specifically, the light modulator can be connected with the control device, which can receive the control signal sent from the control device and modulate the incident light under the control of the control device. The light beam splitter can split the light signal from the light modulator into a first light signal and a second light signal. The first light signal is the light signal output by the light modulation system to the outside, and the second light signal is input into the photodetector. The photodetector can be connected with the control device, which can transmit the detection electrical signal generated according to the second light signal to the control device. According to actual needs, a light beam splitter with different properties can be selected for splitting, for example, a light beam splitter with a transmittance much greater than a reflectivity can be used, which can make most of the light signal output by the light modulator be able to be output to the outside of the system.

[0082] The embodiment splits the light output by the light modulator through the light beam splitter, which can separate the light signal used for monitoring and adjusting from the light signal output by the system to the outside, so that the modulated light signal can be detected in real time and its intensity value can be adjusted in real time without changing the optical path of the system.

[0083] In one embodiment, as shown, Figure 7 The light modulation system further comprises a light shutter and a driving device. The driving device is configured to drive the light shutter to be closed to block the light signal split from the light beam splitter in a non-pulse modulation period and to be opened to conduct the light signal split from the light beam splitter in a pulse modulation period under control of the control device.

[0084] Specifically, in the embodiment, the light shutter is arranged on the optical path of the first light signal output by the light beam splitter and is connected with the driving device and can be opened or closed under the driving of the driving device. The driving device can be connected with the control device and can make the light shutter be closed in the non-pulse modulation period and be opened in the pulse modulation period under the control of the control device.

[0085] The embodiment considers that the light modulation system only needs to output pulsed light signals to the object in some application scenarios, and the continuous light signals output in the non-pulse modulation period will affect the object. The light barrier is driven by the driving device to block the light signals output by the beam splitter to the outside of the system in the non-pulse modulation period, and to conduct the light signals in the pulse modulation period, so as to effectively avoid the influence of the continuous light signals output in the non-pulse modulation period on the object.

[0086] In one embodiment, as shown in Figure 8 The control device of the light modulation system can include a host computer, a signal generator, a power amplifier, a voltage attenuator, and a controller. The signal generator is configured to generate a first electrical signal under the control of the host computer and transmit a second electrical signal to the voltage attenuator through the power amplifier. The controller is configured to control the voltage attenuator under the control of the host computer. The voltage attenuator is configured to adjust the second electrical signal to obtain an electrical signal and control the light modulator under the control of the controller.

[0087] The host computer of the control device can control other devices (such as the signal generator, the voltage attenuator, etc.) of the control device according to the stored computer program to implement the above-mentioned control method of the light modulation system.

[0088] Specifically, the signal generator can be connected to the host computer, and the signal generator can generate a first electrical signal under the control of the host computer. In the non-pulse modulation period or in the configuration stage of the preset stable reference value, the first electrical signal can be a continuous electrical signal; in the pulse modulation period, the first electrical signal can be a pulsed electrical signal.

[0089] The power amplifier can be connected to the signal generator, which amplifies the first electrical signal generated by the signal generator to obtain a second electrical signal, and transmits the second electrical signal to the voltage attenuator.

[0090] The voltage attenuator can be connected to the controller, which can receive a stable control parameter provided by the controller, adjust the received second electrical signal, and output an electrical signal with an intensity value corresponding to the stable control parameter, and transmit it to the light modulator to control the light modulator.

[0091] The controller can be connected to the host computer, the voltage attenuator, and the photodetector, respectively, and receive a detection electrical signal from the photodetector. Under the control of the host computer, the controller calculates a stable control parameter according to the detection electrical signal and a preset stable reference value in the non-pulse modulation period, and sends it to the voltage attenuator; in the pulse modulation period, the target stable control parameter is determined according to the stable control parameter at one or more time points in the non-pulse modulation period, and is sent to the voltage attenuator.

[0092] In some embodiments, the controller can be a controller using proportional integral technology, which collects and records the intensity values of the probe electrical signal in real time in a non-pulse modulation period, and generates a stable control parameter according to the difference between the intensity value of the probe electrical signal at the current time and the preset stable reference value, and the difference accumulated before the time in the non-pulse modulation period. The voltage attenuator can change the intensity of the electrical signal according to the stable control parameter received in real time, thereby performing real-time adjustment control on the optical modulator.

[0093] The control device of the embodiment can improve control efficiency and improve the reliability and stability of the control process through the cooperation of multiple devices.

[0094] In one embodiment, as shown in Figure 9 The optical modulation system further comprises a reflection assembly; the reflection assembly is used for outputting the optical signal to the optical beam splitter after the optical signal undergoes multiple modulations in the optical modulator.

[0095] Specifically, as shown in Figure 9 The reflection assembly can include a quarter-wave plate, a first half-wave plate, a polarization beam splitter prism, a second half-wave plate, a first mirror arranged at the first end of the optical modulator, and a second mirror arranged at the second end of the optical modulator. In addition, the optical modulation system further comprises an optical blocking device, which can be used to block the optical signal.

[0096] The incident light enters the first end of the optical modulator after sequentially passing through the quarter-wave plate, the first half-wave plate, the polarization beam splitter prism, and the second half-wave plate. The optical modulator modulates the incident light once and outputs the modulated primary modulation optical signal from the second end thereof. The required diffraction order of the optical signal can be determined according to the specific application scenario, the optical blocking device is used to block the unnecessary diffraction light, and the required diffraction light reaches the second mirror. The second mirror reflects the primary modulation optical signal to the second end of the optical modulator, and the optical modulator modulates the primary modulation optical signal again and outputs the modulated secondary modulation optical signal from the first end thereof. The secondary modulation optical signal is reflected by the polarization beam splitter prism to the first mirror after passing through the second half-wave plate, and is reflected by the first mirror and then enters the optical beam splitter.

[0097] In the above process, the combination of the quarter-wave plate and the first half-wave plate can realize polarization modulation of the incident light, so that the incident light enters the transmission light path of the polarization beam splitter prism as much as possible. After the incident light is frequency-shifted by the optical modulator, the selected diffraction light, i.e., the primary modulation optical signal, is reflected by the second mirror to the optical modulator. The second half-wave plate can ensure that the secondary modulation optical signal output from the first end of the optical modulator enters the reflection path of the polarization beam splitter prism as much as possible.

[0098] The embodiment sets the reflection component, so that the light signal passes through the light modulator back and forth, so that multiple times of light frequency shift can be realized at the same modulation frequency, and the frequency adjustment range is increased.

[0099] In order to further illustrate the light modulation system and the control method of the light modulation system of the present application, the following is described by means of detailed embodiments.

[0100] Exemplarily, the light modulation system in the embodiment is as shown in Figure 10 The light modulation system includes an acousto-optic modulator, an optical beam splitter, a photodetector, an optical aperture, a driving device, and a control device. The acousto-optic modulator can modulate the incident light under the control of the control device. According to the specific application requirements of the pulsed light signal, the optical path can be adjusted in advance, the selection of the diffraction order can be determined, the unwanted diffraction light can be blocked by the light blocking device, and the selected diffraction light can be transmitted to the optical beam splitter. The optical beam splitter can split the modulated light signal into a first light signal and a second light signal. The first light signal can be output to the outside of the light modulation system through the optical aperture, and the second light signal can be input to the photodetector. The photodetector can convert the second light signal into a detection electrical signal and transmit it to the control device.

[0101] Further, the control device can specifically include a host computer, a controller, a signal generator, a power amplifier, and an adjustable voltage attenuator. The connection mode and control relationship between the devices can refer to the description in the foregoing embodiments, which will not be described here.

[0102] Specifically, during the activation of the light modulation system, the host computer sends a first control signal containing the frequency and intensity to the radio frequency generator of the signal generator, and drives the radio frequency generator to output a corresponding continuous radio frequency signal. Further, the host computer controls the signal generator, the controller, and the driving device according to the timing control signal as shown in Figure 11 The timing control signal TTL1 is used to control the signal generator, the timing control signal TTL2 is used to control the controller, and the timing control signal TTL3 is used to control the driving device.

[0103] During the non-pulse modulation period, the host computer sends a high-level TTL1 signal to the radio frequency switch of the signal generator, so that the radio frequency switch remains open, so that the signal generator can generate a continuous first electrical signal, and the control device as a whole can generate a continuous electrical signal acting on the acousto-optic modulator. At the same time, the host computer sends a high-level TTL2 signal to the controller, so that the controller generates stable control parameters in real time based on the proportional integral method according to the change of the detection electrical signal intensity value received from the photodetector, and transmits them to the adjustable voltage attenuator. On the other hand, the host computer also sends a high-level TTL3 signal to the driving device, so that the driving device controls the optical aperture to close and cut off the light signal output to the outside of the light modulation system.

[0104] When entering the pulse modulation period, the host computer sends a TTL1 signal with high and low levels alternately to the radio frequency switch of the signal generator according to the specific application requirements of the pulse light signal, which controls the radio frequency switch to open at the high level and to close at the low level, so that the first electric signal generated by the signal generator becomes a pulse electric signal. At the same time, the host computer sends a TTL2 signal with low level to the controller, so that the controller stops acquiring the stable control parameter in real time according to the proportional integral, and keeps sending the stable control parameter corresponding to the last moment in the non-pulse modulation period, i.e. the target stable parameter, to the adjustable voltage attenuator. On the other hand, the host computer also sends a TTL3 signal with low level to the driving device, so that the driving device controls the diaphragm to open, and the light modulation system can output the pulse light signal to the outside.

[0105] Therefore, as a whole, the present application can use the digital proportional integral amplification technology combined with the acousto-optic modulator to realize the frequency modulation of the optical path while ensuring the real-time stability of the optical power. In addition, in view of the problem that the short pulse optical power stability is prone to large power fluctuation, the timing control is used to keep the laser open in the idle time for real-time stability. In the short pulse timing, the parameters of the previous open light are used to maintain the stability of the optical power without real-time tracking modulation. After the short pulse timing is over, the open light can be turned on again for real-time power modulation.

[0106] In an embodiment, a computer readable storage medium is provided, and the computer readable storage medium has stored thereon a computer program which, when executed by a processor, implements the steps in any of the above method embodiments.

[0107] In an embodiment, a computer program product is provided, and the computer program product includes a computer program which, when executed by a processor, implements the steps in any of the above method embodiments.

[0108] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a non-volatile computer readable storage medium, and when the computer program is executed, the processes of the above-mentioned embodiments of the methods can be included. Any reference to memory, database or other medium used in the embodiments provided in the present application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (Read-Only Memory, ROM), magnetic tape, floppy disk, flash memory, optical storage, high-density embedded non-volatile memory, resistive memory (ReRAM), magnetoresistive random access memory (Magnetoresistive Random Access Memory, MRAM), ferroelectric memory (Ferroelectric Random Access Memory, FRAM), phase change memory (Phase Change Memory, PCM), graphene memory, etc. Volatile memory can include random access memory (Random Access Memory, RAM) or external cache memory, etc. As an illustration but not limitation, RAM can be in various forms, such as static random access memory (Static Random Access Memory, SRAM) or dynamic random access memory (Dynamic Random Access Memory, DRAM), etc. The database involved in the embodiments provided in the present application can include at least one of a relational database and a non-relational database. The non-relational database can include a distributed database based on a block chain, etc., without being limited thereto. The processor involved in the embodiments provided in the present application can be a general-purpose processor, a central processing unit, a graphics processing unit, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., without being limited thereto.

[0109] Any combination of the technical features of the above embodiments can be made. In order to make the description simple, all possible combinations of the technical features in the above embodiments are not described, however, as long as the combination of the technical features does not exist contradictory, it should be considered as the scope of the present application.

[0110] The above embodiments only express several implementation manners of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the scope of the patent of the present application. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are within the scope of protection of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. A control method of an optical modulation system, characterized by, The method comprises: During a non-pulse modulation period, controlling the optical modulator to perform preset modulation on the incident light, obtaining a detection electrical signal corresponding to the preset modulated light signal by the photodetector, and controlling the optical modulator by a corresponding stable control parameter according to the detection electrical signal and a preset stable reference value, so that the intensity value of the detection electrical signal approaches the preset stable reference value, and obtaining the stable control parameter at one or more time points in the non-pulse modulation period; The method comprises: The stable control parameter comprises the intensity value of the electrical signal acting on the optical modulator; and the controlling the optical modulator by the corresponding stable control parameter according to the detection electrical signal and the preset stable reference value comprises: obtaining the stable control parameter corresponding to the current time point by using a proportional integral method according to the detection electrical signal and the preset stable reference value; and making the electrical signal acting on the optical modulator have a corresponding intensity value according to the stable control parameter. During a pulse modulation period, determining a target stable control parameter according to the stable control parameter closest to the pulse modulation period among the stable control parameters at one or more time points in the non-pulse modulation period, and controlling the optical modulator to perform pulse modulation on the incident light by the target stable control parameter.

2. The method of claim 1, wherein, The method further comprises: During a preset stable reference value configuration stage, controlling the optical modulator to perform configuration modulation on the incident light; According to the optical power value of the configuration modulated light signal received by the optical power meter from the optical beam splitter and a target optical power value, controlling the optical modulator so that the optical power value is the same as the target optical power value; the optical beam splitter is used to split the configuration modulated light signal to the optical power meter and the photodetector; When the optical power value is the same as the target optical power value, setting the detection electrical signal of the photodetector as the preset stable reference value.

3. A control device for an optical modulation system, characterized by comprising: The device comprises: The non-pulse modulation module is configured to control the light modulator to perform preset modulation on incident light when in a non-pulse modulation period, obtain a detection electrical signal corresponding to the light signal subjected to the preset modulation by means of a photodetector, and control the light modulator by means of a corresponding stable control parameter according to the detection electrical signal and a preset stable reference value, so that the intensity value of the detection electrical signal tends to approach the preset stable reference value, and obtain the stable control parameter at one or more time points in the non-pulse modulation period; wherein the control of the light modulator to perform preset modulation on incident light comprises generating an electrical signal acting on the light modulator so that the light modulator performs preset modulation on incident light; wherein the stable control parameter comprises the intensity value of the electrical signal acting on the light modulator; and the control of the light modulator by means of the corresponding stable control parameter according to the detection electrical signal and the preset stable reference value comprises obtaining the stable control parameter corresponding to the current time point by means of a proportional-integral method according to the detection electrical signal and the preset stable reference value, and causing the electrical signal acting on the light modulator to have a corresponding intensity value according to the stable control parameter. The pulse modulation module is configured to determine a target stable control parameter according to the stable control parameter at a time point closest to the pulse modulation period among the stable control parameters at one or more time points in the non-pulse modulation period when entering the pulse modulation period, and control the light modulator to perform pulse modulation on incident light by means of the target stable control parameter.

4. A control device of an optical modulation system comprising a memory and a processor, the memory storing a computer program, characterized in that, The processor executes the computer program to implement the steps of the method in any one of claims 1 to 2.

5. An optical modulation system, characterized by, The system comprises a light modulator, a light beam splitter, a photodetector, and a control device of the light modulation system according to claim 4. The light modulator is configured to be controlled by the control device of the light modulation system to modulate incident light. The light beam splitter is configured to split the light signal from the light modulator to the photodetector. The photodetector is configured to convert the light signal split from the light beam splitter into a detection electrical signal, and transmit the detection electrical signal to the control device.

6. The optical modulation system of claim 5, wherein, The system further comprises a light barrier and a driving device. The driving device is configured to be controlled by the control device to drive the light barrier to be closed to block the light signal split from the light beam splitter in the non-pulse modulation period, and to be opened to conduct the light signal split from the light beam splitter in the pulse modulation period.

7. The optical modulation system of claim 5, wherein, The control device comprises an upper computer, a signal generator, a power amplifier, a voltage attenuator, and a controller. The signal generator is configured to generate a first electrical signal under the control of the upper computer, and transmit a second electrical signal to the voltage attenuator through the power amplifier. The controller is configured to control the voltage attenuator under the control of the upper computer. The voltage attenuator is configured to adjust the second electrical signal to obtain an electrical signal under the control of the controller, and control the light modulator.

8. The optical modulation system of claim 5, wherein, The system further comprises a reflection assembly configured to cause the light signal to be output to the light beam splitter after being modulated multiple times by the light modulator.

9. A computer-readable storage medium having stored thereon a computer program, characterized in that, The computer program, which when executed by a processor, implements the steps of the method of any one of claims 1 to 2.

10. A computer program product comprising a computer program, characterized in that, The computer program, which when executed by a processor, implements the steps of the method of any one of claims 1 to 2.

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