Stable longitudinal mode method and apparatus based on annular sub-cavity following control and related devices

Abstract

This application provides a method, apparatus, and related equipment for stabilizing longitudinal modes based on ring sub-cavity follower control. The method includes: splitting an optical signal into a first decomposed signal and a second decomposed signal using a preset second fiber coupler; sending the first decomposed signal back to the first fiber coupler and sending the second decomposed signal to a preset third fiber coupler; splitting the second decomposed signal into a first sub-signal and a second sub-signal using the third fiber coupler; outputting the first sub-signal; coupling the second sub-signal with a preset reference optical signal and converting it into an electrical signal, and determining the beat frequency value from the electrical signal; determining the output wavelength of the optical signal based on the beat frequency value; determining the sub-cavity length adjustment amount of the ring resonator in the first fiber coupler using the output wavelength; generating a corresponding control signal based on the sub-cavity length adjustment amount; and adjusting the sub-cavity length of the ring resonator using the control signal to stabilize the longitudinal mode of the optical signal.

Description

Technical Field

[0001] The embodiments of this application relate to the field of optical signal control technology, and in particular to a stable longitudinal mode method, apparatus and related equipment based on ring sub-cavity follower control. Background Technology

[0002] The ring cavity of a fiber laser allows for a long cavity design, but in some cases, due to its long cavity length, the corresponding free spectral range is small, there are many potential longitudinal modes, and mode hopping is prone to occur. Summary of the Invention

[0003] In view of this, the purpose of this application is to propose a stable longitudinal mode method, apparatus and related equipment based on annular sub-cavity follower control.

[0004] To achieve the above objectives, this application provides a stable longitudinal mode method based on annular sub-cavity following control, comprising:

[0005] An optical signal is generated using a preset gain fiber, a pump source, and a first fiber coupler. The optical signal is then split into two paths, a first decomposed signal and a second decomposed signal, using a preset second fiber coupler.

[0006] The first decomposition signal is sent back to the first fiber coupler, and the second decomposition signal is sent to the preset third fiber coupler;

[0007] The second decomposed signal is divided into a first sub-signal and a second sub-signal using the third fiber optic coupler. The first sub-signal is output, and the second sub-signal is coupled with a preset reference optical signal and converted into an electrical signal. The beat frequency value is then determined from the electrical signal.

[0008] The output wavelength of the optical signal is determined based on the beat frequency value. The sub-cavity length adjustment amount of the ring resonator in the first fiber coupler is determined using the output wavelength. A corresponding control signal is generated based on the sub-cavity length adjustment amount, and the sub-cavity length of the ring resonator is adjusted using the control signal to stabilize the longitudinal mode of the optical signal.

[0009] Furthermore, an optical signal is generated using a pre-defined gain fiber, a pump source, and a first fiber coupler, including:

[0010] The optical signal is generated using a first fiber coupler with a coupling ratio of 50:50 and a ring resonant cavity with a subcavity length of 0.6m.

[0011] Furthermore, the optical signal is split into two paths, a first decomposed signal and a second decomposed signal, using a pre-set second fiber optic coupler, including:

[0012] The second fiber coupler is configured to separate 90% of the optical signal at a coupling ratio of 90:10 and determine it as the first decomposed signal, and then separate 90% of the optical signal and determine it as the second decomposed signal.

[0013] Further, coupling the second sub-signal with a preset reference optical signal and converting it into an electrical signal includes:

[0014] The second sub-signal and the reference optical signal are coupled using a pre-set fourth fiber optic coupler to obtain a coupled signal;

[0015] The current power of the coupled signal is attenuated to the target power using a preset attenuator;

[0016] The coupled signal, after power attenuation, is converted into an electrical signal using a pre-set photodetector.

[0017] Further, the adjustment amount of the sub-cavity length of the ring resonator in the first fiber coupler is determined using the output wavelength, including:

[0018] The cavity length control formula shown below is constructed using the output wavelength.

[0019]

[0020] Wherein, ΔL represents the adjustment amount of the sub-cavity length; q L λ represents the order of the transmission peak value of the ring resonator corresponding to the laser output mode of the optical signal; ′ L λ represents the center wavelength at the current moment. C This represents the center wavelength difference between the laser output mode and the resonant cavity mode at the initial moment; n ′ o This represents the average refractive index of each sub-cavity at the current moment; a o T represents the coefficient of thermal expansion of each sub-cavity. ′ The ambient temperature is represented at the current moment, and A represents a constant.

[0021] Furthermore, adjusting the sub-cavity length of the annular resonant cavity using the control signal to stabilize the longitudinal mode of the optical signal includes:

[0022] The control signal is sent to a preset fiber optic stretch driver;

[0023] The fiber optic stretching driver generates a corresponding control voltage according to the control signal and applies the control voltage to a preset fiber optic stretcher.

[0024] The fiber stretcher is used to adjust the length of the sub-cavity of the annular resonant cavity in the first optical coupler.

[0025] Based on the same inventive concept, this application also provides a stable longitudinal mode device based on ring sub-cavity follower control, including: an optical signal circuit and a feedback signal circuit connected to each other;

[0026] The optical signal loop is configured to generate an optical signal, divide the optical signal into two paths, a first decomposed signal and a second decomposed signal, and send the second decomposed signal to the feedback signal loop.

[0027] The feedback signal loop is configured to receive the second decomposed signal, generate a control signal using the second decomposed signal, generate a control voltage from the control signal, and send the control voltage to the optical signal loop.

[0028] The optical signal circuit is further configured to receive the control voltage and adjust the sub-cavity length of the ring resonant cavity when generating the optical signal according to the control voltage, so as to stabilize the longitudinal mode of the optical signal.

[0029] The optical signal circuit includes,

[0030] The first fiber coupler, with a coupling ratio of 50:50, is configured to construct a ring resonant cavity with a subcavity length of 0.6m and generate an optical signal.

[0031] A second fiber optic coupler connected to the first fiber optic coupler, having a coupling ratio of 90:10, is configured to receive an optical signal, and according to the 90:10 coupling ratio, separate 90% of the optical signal and determine it as the first decomposed signal, and separate 90% of the optical signal and determine it as the second decomposed signal.

[0032] An optical fiber stretcher connected to the first optical fiber coupler is configured to receive the control voltage and adjust the sub-cavity length of the annular resonant cavity of the first optical fiber coupler according to the control voltage.

[0033] The feedback signal loop includes,

[0034] A third fiber optic coupler connected to the second fiber optic coupler is configured to divide the second decomposed signal into a first sub-signal and a second sub-signal, output the first sub-signal, and transmit the second sub-signal.

[0035] The fourth fiber optic coupler connected to the third fiber optic coupler is configured to receive the second sub-signal, couple the second sub-signal with a preset reference optical signal to obtain a coupled signal, and then transmit it.

[0036] An attenuator connected to the fourth fiber optic coupler is configured to receive the coupled signal and attenuate the current power of the coupled signal to a target power.

[0037] The photodetector connected to the attenuator is configured to receive the attenuated coupled signal and convert the attenuated coupled signal into an electrical signal.

[0038] An electronic frequency meter connected to the photodetector is configured to receive the electrical signal and determine the beat frequency value from the electrical signal;

[0039] The processor connected to the electronic frequency meter is configured to acquire the beat frequency value from the electronic frequency meter, determine the output wavelength of the optical signal based on the beat frequency value, determine the sub-cavity length adjustment amount of the ring resonator in the first fiber coupler using the output wavelength, and generate and send a corresponding control signal based on the sub-cavity length adjustment amount.

[0040] The fiber optic stretching driver connected to the processor is configured to receive the control signal, generate a corresponding control voltage based on the control signal, and apply it to the fiber optic stretcher.

[0041] Based on the same inventive concept, this application also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, it implements the stable longitudinal mode method based on ring sub-cavity follower control as described above.

[0042] Based on the same inventive concept, this application also provides a non-transitory computer-readable storage medium, wherein the non-transitory computer-readable storage medium stores computer instructions for causing the computer to execute the stable longitudinal mode method based on the above-described ring sub-cavity follower control.

[0043] As can be seen from the above, the stable longitudinal mode method, apparatus, and related equipment based on ring sub-cavity follower control provided in this application, based on the set feedback control loop, comprehensively considers the adjustment of both the optical signal loop and the feedback control loop signals. After the optical signal is divided into a first decomposed signal and a second decomposed signal by the first fiber coupler, the second decomposed signal is used to calculate the sub-cavity length adjustment amount in the feedback control loop. Specifically, it is coupled with the set reference optical signal to determine the beat frequency value after coupling, thereby obtaining the output wavelength of the optical signal. The sub-cavity length adjustment amount can be calculated using this output wavelength, thereby realizing the adjustment of the sub-cavity length of the ring resonator in the first fiber coupler, thereby extending the mode stabilization time and reducing the number of mode hopping. Attached Figure Description

[0044] To more clearly illustrate the technical solutions in this application or related technologies, the drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0045] Figure 1 This is a flowchart of a stable longitudinal mode method based on annular sub-cavity follower control, as described in an embodiment of this application.

[0046] Figure 2 This is a schematic diagram of the stable longitudinal mode device based on annular sub-cavity following control according to an embodiment of this application;

[0047] Figure 3 This is a schematic diagram of the electronic device structure according to an embodiment of this application. Detailed Implementation

[0048] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with specific embodiments and the accompanying drawings.

[0049] It should be noted that, unless otherwise defined, the technical or scientific terms used in the embodiments of this application should have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," and similar terms used in the embodiments of this application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are only used to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0050] As described in the background section, the relevant stable longitudinal mode methods based on ring sub-cavity follower control are still difficult to meet the needs of practical communication.

[0051] In the process of developing this application, the applicant discovered that the main problem with the relevant stable longitudinal mode method based on ring cavity follower control is that the ring cavity of the fiber laser allows for a long cavity design, but in some cases, due to its long cavity length, the corresponding free spectral range is small, there are many potential longitudinal modes, and mode hopping is prone to occur.

[0052] For example, when the cavity length changes due to various factors such as temperature, it is easy to cause mode mismatch between the resonant modes of the sub-cavities or mismatch between the sub-cavity modes and the laser output, resulting in mode switching.

[0053] Based on this, one or more embodiments of this application provide a stable longitudinal mode method based on annular sub-cavity follower control.

[0054] In the embodiments of this application, two signal circuits, an optical signal circuit and a feedback control circuit, can be set up to be interconnected. The optical signal circuit is used to generate an optical signal, and the feedback control circuit is used to adjust the ring resonant cavity in the optical signal circuit that generates the optical signal.

[0055] The embodiments of this application are described in detail below with reference to the accompanying drawings.

[0056] refer to Figure 1 A stable longitudinal mode method based on annular sub-cavity follower control according to one embodiment of this application includes the following steps:

[0057] Step S101: Generate an optical signal using a preset gain fiber, pump source and first fiber coupler, and divide the optical signal into two paths, a first decomposed signal and a second decomposed signal, using a preset second fiber coupler.

[0058] In the embodiments of this application, such as Figure 2 As shown, the optical signal loop includes LD1 (laser diode), WDM (wavelength division multiplexer), EDF (erbium-doped fiber), CIR (circulator), SA (saturable absorber), FBG (fiber Bragg grating), FS (fiber stretcher), OC1 (first fiber coupler) and OC2 (second fiber coupler).

[0059] Furthermore, LD1 is connected to EDF via WDM, and LD1 and WDM are used as pump sources. LD1 is 980nm and WDM is 980 / 1550nm. Based on this, LD1 can be pumped through WDM, EDF is used as the gain fiber, and OC1 is used to establish a ring resonant cavity to generate an optical signal. The ring resonant cavity includes multiple sub-cavities, the coupling ratio of OC1 is 50:50, and the sub-cavity length is 0.6m.

[0060] Furthermore, the EDF is connected to OC2, OC2 is connected to OC1, and OC1 is connected to the CIR to form an optical signal loop. OC1 is also connected to the FS, allowing the receiver FS to adjust the cavity length of the OC1 sub-cavity. The CIR is also connected to one end of a 3m long SA through a common port, and the other end of the SA is connected to an FBG with 99% reflectivity and 0.1nm bandwidth. Based on this, potential longitudinal modes within the gain bandwidth can be suppressed, and the CIR can suppress coupling between two orthogonal polarization states to achieve unidirectional propagation of light waves within the ring resonant cavity.

[0061] Furthermore, the generated optical signal is sent to OC2, which can then divide the optical signal into two signals: a first decomposed signal and a second decomposed signal.

[0062] In a specific example, the coupling ratio of OC2 can be 90:10, which can split the optical signal into two paths, 90% and 10%. OC2 can guide 90% of the optical signal back into the ring resonant cavity and use it as the first decomposition signal, and send 10% of the optical signal to the feedback control loop and use it as the second decomposition signal.

[0063] Step S102: Send the first decomposition signal back to the first fiber coupler, and send the second decomposition signal to the preset third fiber coupler.

[0064] In the embodiments of this application, such as Figure 2 As shown, the feedback control loop includes OC3 (third fiber coupler), OC4 (fourth fiber coupler), LD2 (reference laser), VOA (attenuator), PD (photodetector), EFM (electronic frequency meter), PC (processor) and FSD (fiber stretching driver).

[0065] Furthermore, in the optical signal loop, OC2 is connected to OC3, OC3 is connected to OC4, and at the end of OC4 connected to OC3, OC4 is also connected to LD2. The other end of OC4 is connected to VOA, VOA is connected to PD, PD is connected to EFM, EFM is connected to PC, PC is connected to FSD, and FSD is connected to FS.

[0066] Furthermore, based on the determined first decomposition signal and second decomposition signal, the first transmission signal can be sent back to the connected OC1, and the second decomposition signal can be sent to OC3.

[0067] Step S103: The second decomposed signal is divided into a first sub-signal and a second sub-signal using the third fiber optic coupler. The first sub-signal is output, and the second sub-signal is coupled with a preset reference optical signal and converted into an electrical signal. The beat frequency value is determined from the electrical signal.

[0068] In the embodiments of this application, OC3 can receive the second decomposed signal from OC2 and divide it into two equal signals, namely, the first sub-signal and the second sub-signal.

[0069] Among them, such as Figure 2 As shown, the first sub-signal can be output to the outside of the feedback control loop, and the second sub-signal can be sent to OC4.

[0070] Furthermore, LD2 can generate a reference optical signal and send the reference optical signal to OC4.

[0071] Furthermore, when receiving the second sub-signal, OC4 can also receive the reference optical signal from LD2 and couple the second sub-signal and the reference optical signal. In this embodiment, the coupled signal is used as the coupling signal.

[0072] Furthermore, OC4 can send the coupling signal to VOA. After receiving the coupling signal, OVA can attenuate the current power of the coupling signal to a preset target power.

[0073] Furthermore, the VOA sends the coupled signal, after power attenuation, to the PD, so that the PD can convert it into an electrical signal.

[0074] Based on this, the PD can send the converted electrical signal to the EFM. Since the electrical signal is obtained by coupling two beams of light, the second sub-signal and the reference optical signal, the EFM can determine the beat frequency value of the electrical signal after receiving it.

[0075] Step S104: Determine the output wavelength of the optical signal based on the beat frequency value, determine the sub-cavity length adjustment amount of the ring resonator in the first fiber coupler using the output wavelength, generate a corresponding control signal based on the sub-cavity length adjustment amount, and adjust the sub-cavity length of the ring resonator using the control signal to stabilize the longitudinal mode of the optical signal.

[0076] In the embodiments of this application, based on the beat frequency value determined in the foregoing steps, EFM can send the beat frequency value to the PC.

[0077] Furthermore, since the center wavelength of the reference optical signal generated by LD2 is known, the output wavelength of the optical signal can be determined based on the beat frequency value.

[0078] Furthermore, the cavity length control formula shown below can be constructed using this output wavelength:

[0079]

[0080] Where ΔL represents the sub-cavity length adjustment amount; qL λ represents the order of the transmission peak value of the ring resonator corresponding to the laser output mode of the optical signal. ′ L λ represents the center wavelength at the current moment. C This represents the center wavelength difference between the laser output mode and the resonant cavity mode at the initial moment; n ′ o This represents the average refractive index of each sub-cavity at the current moment; a o T represents the coefficient of thermal expansion of each sub-cavity. ′ The ambient temperature is represented at the current moment, and A represents a constant.

[0081] Based on this, the PC can input the obtained cavity length adjustment into a preset PID (proportional-integral-derivative) logic algorithm, and the control signal can be calculated using this PID algorithm.

[0082] This control signal can be used to adjust the voltage.

[0083] Furthermore, the PC can use this control signal to drive the FSD. Based on this, the FSD can generate a control voltage to drive the FS and send the control voltage to the FS.

[0084] Based on this, FS can use the control voltage to adjust the sub-cavity length of the ring resonator of OC1 to achieve stable longitudinal mode of optical signal, and specifically can ensure that the resonant mode of sub-cavity coincides with the laser output mode, thereby reducing mode hopping.

[0085] As can be seen, the stable longitudinal mode method based on ring sub-cavity follower control in the embodiments of this application, based on the set feedback control loop, comprehensively considers the adjustment of both the optical signal loop and the feedback control loop signals. After the optical signal is divided into a first decomposed signal and a second decomposed signal by the first fiber coupler, the second decomposed signal is used to calculate the sub-cavity length adjustment amount in the feedback control loop. Specifically, it is coupled with the set reference optical signal to determine the beat frequency value after coupling, thereby obtaining the output wavelength of the optical signal. The sub-cavity length adjustment amount can be calculated using this output wavelength, thereby realizing the adjustment of the sub-cavity length of the ring resonator in the first fiber coupler, thereby extending the mode stabilization time and reducing the number of mode hopping.

[0086] It should be noted that the method of the embodiments of this application can be executed by a single device, such as a computer or server. The method of this embodiment can also be applied in a distributed scenario, where multiple devices cooperate to complete the task. In such a distributed scenario, one of these devices may execute only one or more steps of the method of the embodiments of this application, and the multiple devices will interact with each other to complete the method described.

[0087] It should be noted that the above description describes some embodiments of this application. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recorded in the claims can be performed in a different order than that shown in the above embodiments and still achieve the desired result. Furthermore, the processes depicted in the drawings do not necessarily require a specific or sequential order to achieve the desired result. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0088] Based on the same inventive concept, and corresponding to any of the above embodiments, the embodiments of this application also provide a stable longitudinal mode device based on annular sub-cavity following control.

[0089] refer to Figure 2 The stabilized longitudinal mode device based on ring sub-cavity follower control includes: an optical signal circuit and a feedback signal circuit that are interconnected.

[0090] The optical signal loop is configured to generate an optical signal, divide the optical signal into two paths, a first decomposed signal and a second decomposed signal, and send the second decomposed signal to the feedback signal loop.

[0091] The feedback signal loop is configured to receive the second decomposed signal, generate a control signal using the second decomposed signal, generate a control voltage from the control signal, and send the control voltage to the optical signal loop.

[0092] The optical signal circuit is further configured to receive the control voltage and adjust the sub-cavity length of the ring resonant cavity when generating the optical signal according to the control voltage, so as to stabilize the longitudinal mode of the optical signal.

[0093] As an optional embodiment, the optical signal loop includes:

[0094] The first fiber coupler, with a coupling ratio of 50:50, is configured to construct a ring resonant cavity with a subcavity length of 0.6m and generate an optical signal.

[0095] A second fiber optic coupler connected to the first fiber optic coupler, having a coupling ratio of 90:10, is configured to receive an optical signal, and according to the 90:10 coupling ratio, separate 90% of the optical signal and determine it as the first decomposed signal, and separate 90% of the optical signal and determine it as the second decomposed signal.

[0096] An optical fiber stretcher connected to the first optical fiber coupler is configured to receive the control voltage and adjust the sub-cavity length of the annular resonant cavity of the first optical fiber coupler according to the control voltage.

[0097] As an optional embodiment, the feedback signal loop includes:

[0098] A third fiber optic coupler connected to the second fiber optic coupler is configured to divide the second decomposed signal into a first sub-signal and a second sub-signal, output the first sub-signal, and transmit the second sub-signal.

[0099] The fourth fiber optic coupler connected to the third fiber optic coupler is configured to receive the second sub-signal, couple the second sub-signal with a preset reference optical signal to obtain a coupled signal, and then transmit it.

[0100] An attenuator connected to the fourth fiber optic coupler is configured to receive the coupled signal and attenuate the current power of the coupled signal to a target power.

[0101] The photodetector connected to the attenuator is configured to receive the attenuated coupled signal and convert the attenuated coupled signal into an electrical signal.

[0102] An electronic frequency meter connected to the photodetector is configured to receive the electrical signal and determine the beat frequency value from the electrical signal;

[0103] The processor connected to the electronic frequency meter is configured to acquire the beat frequency value from the electronic frequency meter, determine the output wavelength of the optical signal based on the beat frequency value, determine the sub-cavity length adjustment amount of the ring resonator in the first fiber coupler using the output wavelength, and generate and send a corresponding control signal based on the sub-cavity length adjustment amount.

[0104] The fiber optic stretching driver connected to the processor is configured to receive the control signal, generate a corresponding control voltage based on the control signal, and apply it to the fiber optic stretcher.

[0105] For ease of description, the above apparatus is described in terms of its functions, divided into various modules. Of course, in implementing the embodiments of this application, the functions of each module can be implemented in one or more software and / or hardware.

[0106] The apparatus of the above embodiments is used to implement the corresponding stable longitudinal mode method based on annular sub-cavity following control in any of the foregoing embodiments, and has the beneficial effects of the corresponding method embodiments, which will not be repeated here.

[0107] Based on the same inventive concept, corresponding to the methods of any of the above embodiments, embodiments of this application also provide an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the program, it implements the stable longitudinal mode method based on ring sub-cavity follower control as described in any of the above embodiments.

[0108] Figure 3 This embodiment illustrates a more specific hardware structure of an electronic device, which may include a processor 1010, a memory 1020, an input / output interface 1030, a communication interface 1040, and a bus 1050. The processor 1010, memory 1020, input / output interface 1030, and communication interface 1040 are interconnected internally via the bus 1050.

[0109] The processor 1010 can be implemented using a general-purpose CPU (Central Processing Unit), microprocessor, application-specific integrated circuit (ASIC), or one or more integrated circuits, and is used to execute relevant programs to implement the technical solutions provided in the embodiments of this application.

[0110] The memory 1020 can be implemented in the form of ROM (Read Only Memory), RAM (Random Access Memory), static storage device, dynamic storage device, etc. The memory 1020 can store the operating system and other applications. When the technical solutions provided in the embodiments of this application are implemented by software or firmware, the relevant program code is stored in the memory 1020 and is called and executed by the processor 1010.

[0111] The input / output interface 1030 is used to connect input / output modules to realize information input and output. Input / output modules can be configured as components within the device (not shown in the figure) or externally connected to the device to provide corresponding functions. Input devices may include keyboards, mice, touchscreens, microphones, various sensors, etc., while output devices may include displays, speakers, vibrators, indicator lights, etc.

[0112] The communication interface 1040 is used to connect a communication module (not shown in the figure) to enable communication between this device and other devices. The communication module can communicate via wired means (such as USB, Ethernet cable, etc.) or wireless means (such as mobile network, WIFI, Bluetooth, etc.).

[0113] Bus 1050 includes a pathway for transmitting information between various components of the device, such as processor 1010, memory 1020, input / output interface 1030, and communication interface 1040.

[0114] It should be noted that although the above-described device only shows the processor 1010, memory 1020, input / output interface 1030, communication interface 1040, and bus 1050, in specific implementations, the device may also include other components necessary for normal operation. Furthermore, those skilled in the art will understand that the above-described device may only include the components necessary for implementing the embodiments of this application, and not necessarily all the components shown in the figures.

[0115] The apparatus of the above embodiments is used to implement the corresponding stable longitudinal mode method based on annular sub-cavity following control in any of the foregoing embodiments, and has the beneficial effects of the corresponding method embodiments, which will not be repeated here.

[0116] Based on the same inventive concept, corresponding to the methods of any of the above embodiments, this application also provides a non-transitory computer-readable storage medium storing computer instructions for causing the computer to execute the stable longitudinal mode method based on ring sub-cavity follower control as described in any of the above embodiments.

[0117] The computer-readable medium of this embodiment includes permanent and non-permanent, removable and non-removable media, and information storage can be implemented by any method or technology. Information can be computer-readable instructions, data structures, program modules, or other data. Examples of computer storage media include, but are not limited to, phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, CD-ROM, digital versatile optical disc (DVD) or other optical storage, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other non-transfer medium that can be used to store information accessible by a computing device.

[0118] The computer instructions stored in the storage medium of the above embodiments are used to cause the computer to execute the stable longitudinal mode method based on ring sub-cavity follower control as described in any of the above embodiments, and have the beneficial effects of the corresponding method embodiments, which will not be repeated here.

[0119] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of this application (including the claims) is limited to these examples; within the framework of this application, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of the embodiments of this application as described above, which are not provided in detail for the sake of brevity.

[0120] Additionally, to simplify the description and discussion, and to avoid obscuring the embodiments of this application, the well-known power / ground connections to integrated circuit (IC) chips and other components may or may not be shown in the provided drawings. Furthermore, the apparatus may be shown in block diagram form to avoid obscuring the embodiments of this application, and this also takes into account the fact that the details of implementation of these block diagram apparatuses are highly dependent on the platform on which the embodiments of this application will be implemented (i.e., these details should be fully understood by those skilled in the art). While specific details (e.g., circuits) have been set forth to describe exemplary embodiments of this application, it will be apparent to those skilled in the art that the embodiments of this application can be implemented without these specific details or with variations thereof. Therefore, these descriptions should be considered illustrative rather than restrictive.

[0121] Although this application has been described in conjunction with specific embodiments thereof, many substitutions, modifications, and variations of these embodiments will be apparent to those skilled in the art from the foregoing description. For example, other memory architectures (e.g., dynamic RAM (DRAM)) may be used with the embodiments discussed.

[0122] The embodiments of this application are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the embodiments of this application should be included within the protection scope of this application.

Claims

1. A stable longitudinal mode method based on annular sub-cavity following control, characterized in that, include: An optical signal is generated using a preset gain fiber, a pump source, and a first fiber coupler. The optical signal is then split into two paths, a first decomposed signal and a second decomposed signal, using a preset second fiber coupler. The first decomposition signal is sent back to the first fiber coupler, and the second decomposition signal is sent to the preset third fiber coupler; The second decomposed signal is divided into a first sub-signal and a second sub-signal using the third fiber optic coupler. The first sub-signal is output, and the second sub-signal is coupled with a preset reference optical signal and converted into an electrical signal. The beat frequency value is then determined from the electrical signal. The output wavelength of the optical signal is determined based on the beat frequency value. The sub-cavity length adjustment amount of the ring resonator in the first fiber coupler is determined using the output wavelength. A corresponding control signal is generated based on the sub-cavity length adjustment amount. The sub-cavity length of the ring resonator is adjusted using the control signal to stabilize the longitudinal mode of the optical signal. The step of coupling the second sub-signal with a preset reference optical signal and converting it into an electrical signal includes: The second sub-signal and the reference optical signal are coupled using a pre-set fourth fiber optic coupler to obtain a coupled signal; The current power of the coupled signal is attenuated to the target power using a preset attenuator; The coupled signal, after power attenuation, is converted into an electrical signal using a pre-set photodetector. The method of adjusting the sub-cavity length of the annular resonant cavity using the control signal to stabilize the longitudinal mode of the optical signal includes: The control signal is sent to a preset fiber optic stretch driver; The fiber optic stretching driver generates a corresponding control voltage according to the control signal and applies the control voltage to a preset fiber optic stretcher. The fiber stretcher is used to adjust the length of the sub-cavity of the annular resonant cavity in the first fiber coupler.

2. The method according to claim 1, characterized in that, The generation of optical signals using a preset gain fiber, a pump source, and a first fiber coupler includes: The optical signal is generated using a first fiber coupler with a coupling ratio of 50:50 and a ring resonant cavity with a subcavity length of 0.6m.

3. The method according to claim 1, characterized in that, The process of splitting the optical signal into two paths, a first decomposed signal and a second decomposed signal, using a pre-set second fiber optic coupler includes: The second fiber coupler is configured to separate 90% of the optical signal at a coupling ratio of 90:10 and determine it as the first decomposed signal, and then separate 90% of the optical signal and determine it as the second decomposed signal.

4. The method according to claim 1, characterized in that, The step of determining the sub-cavity length adjustment of the ring resonator in the first fiber coupler using the output wavelength includes: The cavity length control formula shown below is constructed using the output wavelength. ； in, This indicates the adjustment amount of the sub-cavity length; This indicates the order of the transmission peak value of the ring resonator corresponding to the laser output mode of the optical signal; Indicates the center wavelength at the current moment; This represents the center wavelength difference between the laser output mode and the resonant cavity resonant mode at the initial moment; This represents the average refractive index of each sub-cavity at the current moment; This represents the coefficient of thermal expansion of each sub-cavity. The ambient temperature is represented at the current moment, and A represents a constant.

5. A stable longitudinal mode device based on annular sub-cavity following control, characterized in that, The method for performing the method as described in any one of claims 1-4 includes: an optical signal loop and a feedback signal loop interconnected; The optical signal loop is configured to generate an optical signal, divide the optical signal into two paths, a first decomposed signal and a second decomposed signal, and send the second decomposed signal to the feedback signal loop. The feedback signal loop is configured to receive the second decomposed signal, generate a control signal using the second decomposed signal, generate a control voltage from the control signal, and send the control voltage to the optical signal loop. The optical signal circuit is further configured to receive the control voltage and adjust the sub-cavity length of the ring resonant cavity when generating the optical signal according to the control voltage, so as to stabilize the longitudinal mode of the optical signal.

6. The apparatus according to claim 5, characterized in that, The optical signal circuit includes, The first fiber coupler, with a coupling ratio of 50:50, is configured to construct a ring resonant cavity with a subcavity length of 0.6m and generate an optical signal. A second fiber optic coupler connected to the first fiber optic coupler, having a coupling ratio of 90:10, is configured to receive an optical signal, and according to the 90:10 coupling ratio, separate 90% of the optical signal and determine it as the first decomposed signal, and separate 90% of the optical signal and determine it as the second decomposed signal. An optical fiber stretcher connected to the first optical fiber coupler is configured to receive the control voltage and adjust the sub-cavity length of the annular resonant cavity of the first optical fiber coupler according to the control voltage. The feedback signal loop includes, A third fiber optic coupler connected to the second fiber optic coupler is configured to divide the second decomposed signal into a first sub-signal and a second sub-signal, output the first sub-signal, and transmit the second sub-signal. The fourth fiber optic coupler connected to the third fiber optic coupler is configured to receive the second sub-signal, couple the second sub-signal with a preset reference optical signal to obtain a coupled signal, and then transmit it. An attenuator connected to the fourth fiber optic coupler is configured to receive the coupled signal and attenuate the current power of the coupled signal to a target power. The photodetector connected to the attenuator is configured to receive the attenuated coupled signal and convert the attenuated coupled signal into an electrical signal. An electronic frequency meter connected to the photodetector is configured to receive the electrical signal and determine the beat frequency value from the electrical signal; The processor connected to the electronic frequency meter is configured to acquire the beat frequency value from the electronic frequency meter, determine the output wavelength of the optical signal based on the beat frequency value, determine the sub-cavity length adjustment amount of the ring resonator in the first fiber coupler using the output wavelength, and generate and send a corresponding control signal based on the sub-cavity length adjustment amount. The fiber optic stretching driver connected to the processor is configured to receive the control signal, generate a corresponding control voltage based on the control signal, and apply it to the fiber optic stretcher.

7. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable by the processor, characterized in that, When the processor executes the computer program, it implements the method as described in any one of claims 1 to 4.

8. A non-transitory computer-readable storage medium, characterized in that, The non-transitory computer-readable storage medium stores computer instructions for causing the computer to perform the method according to any one of claims 1 to 4.

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