Polarization scrambler, method, electronic device and storage medium based on piezoelectric ceramics

Abstract

The present invention provides a piezoelectric ceramic-based polarization scrambler, method, electronic device, and storage medium, relating to the field of optical fiber transmission technology. The device comprises: a polarization beam splitter assembly, a piezoelectric ceramic, and a polarization combiner (PBC). The polarization beam splitter assembly is connected to the piezoelectric ceramic and the PBC, respectively, and the piezoelectric ceramic is connected to the PBC. The polarization beam splitter assembly is used to decompose the polarization direction of initial polarized light to obtain a first polarization state light and a second polarization state light. The piezoelectric ceramic is used to adjust the phase of the second polarization state light under the application of voltage to obtain a target polarization state light. The PBC is used to combine the first polarization state light and the target polarization state light to obtain the polarized light after polarization scrambling. The present invention reduces the cost of polarization scrambling and the required driving voltage, and reduces the size of the device.

Description

Technical Field

[0001] The present invention relates to the field of optical fiber transmission technology, and in particular to a polarization scrambler, method, electronic equipment and storage medium based on piezoelectric ceramics. Background Art

[0002] In Brillouin Optical Time Domain Analysis (BOTDA) and Brillouin Optical Time Domain Reflectometry (BOTDR) systems, polarization scrambling is required to mitigate the impact of polarization fading noise on the system. Existing polarization scrambling technologies are divided into two categories: passive scrambling and active scrambling.

[0003] However, in order to ensure the effect of polarization scrambling, the existing passive polarization scrambling requires a long distance of polarization-maintaining optical fiber and multiple piezoelectric ceramics, resulting in the problems of high cost and large equipment size in the existing polarization scrambling technology. Summary of the Invention

[0004] The present invention provides a polarization scrambler, method, electronic device and storage medium based on piezoelectric ceramics, which are used to solve the defects of high polarization scrambling cost and large equipment size caused by long-distance polarization-maintaining optical fiber and multiple piezoelectric ceramics in the prior art, thereby reducing the cost and size of the equipment, and only requires applying voltage to one piezoelectric ceramic, thereby reducing the required driving voltage.

[0005] The present invention provides a polarization scrambler based on piezoelectric ceramics, comprising: a polarization beam splitting component, a piezoelectric ceramic, and a polarization combiner PBC, wherein the polarization beam splitting component is connected to the piezoelectric ceramic and the PBC respectively, and the piezoelectric ceramic is connected to the PBC;

[0006] The polarization beam splitting component is used to decompose the polarization direction of the initial polarized light to obtain a first polarization state light and a second polarization state light; the direction of the first polarization state light is perpendicular to the direction of the second polarization state light;

[0007] The piezoelectric ceramic is used to adjust the phase of the second polarization state light to obtain the target polarization state light when a voltage is applied;

[0008] The PBC is used to synthesize the polarization states of the first polarization state light and the target polarization state light to obtain scrambled polarized light.

[0009] According to a piezoelectric ceramic-based polarization scrambler provided by the present invention, the polarization beam splitting assembly includes a power holding unit and a polarization beam splitter PBS, wherein the power holding unit is connected to the PBS, and the PBS is respectively connected to the piezoelectric ceramic and the PBC; the PBS is used to split the polarization direction of the initial polarized light to obtain the first polarization state light and the second polarization state light; the power holding unit is used to maintain the difference between the optical power of the first polarization state light and the optical power of the second polarization state light to meet a preset difference.

[0010] According to a piezoelectric ceramic-based polarization scrambler provided by the present invention, the power maintenance unit includes a first polarization-maintaining fiber and a second polarization-maintaining fiber, wherein the first polarization-maintaining fiber and the second polarization-maintaining fiber are fused at a preset angle, and the preset angle is an angle that maintains the difference between the optical power of the first polarization state light and the optical power of the second polarization state light to meet the preset difference.

[0011] According to the present invention, a polarization scrambler based on piezoelectric ceramics further includes a third polarization-maintaining fiber and a fourth polarization-maintaining fiber. The length of the third polarization-maintaining fiber is the same as that of the fourth polarization-maintaining fiber, wherein the third polarization-maintaining fiber is respectively connected to the polarization beam splitting component and the PBC, and the fourth polarization-maintaining fiber is wound on the piezoelectric ceramic and has its two ends respectively connected to the polarization beam splitting component and the PBC; the third polarization-maintaining fiber is used to transmit the first polarization state light; and the fourth polarization-maintaining fiber is used to transmit the target polarization state light.

[0012] According to a polarization scrambler based on a piezoelectric ceramic provided by the present invention, a voltage applied to the piezoelectric ceramic is greater than a preset voltage, and the preset voltage is determined based on the outer diameter of the piezoelectric ceramic, the length of the fourth polarization-maintaining optical fiber, and the phase difference between the target polarization state light and the first polarization state light.

[0013] The present invention further provides a polarization scrambling method based on piezoelectric ceramics, which is applied to the polarization scrambling instrument based on piezoelectric ceramics, comprising:

[0014] Obtaining initial polarized light;

[0015] Splitting the polarization direction of the initial polarized light by a polarization beam splitter in the polarization scrambler to obtain light in a first polarization state and light in a second polarization state;

[0016] When voltage is applied to the piezoelectric ceramic in the polarization scrambler, the phase of the second polarization state light is adjusted to obtain the target polarization state light;

[0017] The first polarization state light and the target polarization state light are polarization-synthesized by the PBC in the polarization scrambler to obtain scrambled polarized light.

[0018] According to a polarization scrambling method based on piezoelectric ceramics provided by the present invention, the polarization beam splitting component includes a power holding unit and a polarization beam splitter PBS. The polarization direction of the initial polarized light is decomposed by the polarization beam splitter component in the polarization scrambler to obtain a first polarization state light and a second polarization state light, including: determining a first amplitude corresponding to the first polarization state light and a second amplitude corresponding to the second polarization state light by the power holding unit; and splitting the polarization direction of the initial polarized light based on the first amplitude and the second amplitude by the PBS to obtain the first polarization state light and the second polarization state light.

[0019] According to a polarization scrambling method based on piezoelectric ceramics provided by the present invention, the polarization scrambler also includes a third polarization-maintaining fiber and a fourth polarization-maintaining fiber, the length of the third polarization-maintaining fiber is the same as the length of the fourth polarization-maintaining fiber, and the piezoelectric ceramics in the polarization scrambler adjust the phase of the second polarization-state light when a voltage is applied to obtain the target polarization-state light. The method also includes: transmitting the first polarization-state light to the PBC through the third polarization-maintaining fiber; and transmitting the target polarization-state light to the PBC through the fourth polarization-maintaining fiber.

[0020] The present invention also provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the piezoelectric ceramic-based polarization scrambling method described above is implemented.

[0021] The present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the piezoelectric ceramic-based polarization scrambling method described above is implemented.

[0022] The present invention further provides a computer program product, comprising a computer program, wherein when the computer program is executed by a processor, the computer program implements any of the above-mentioned piezoelectric ceramic-based polarization scrambling methods.

[0023] The piezoelectric ceramic-based polarization scrambler, method, electronic device, and storage medium provided by the present invention are constructed by connecting a polarization beam splitter assembly to a piezoelectric ceramic and a polarization beam combiner (PBC), and then connecting the piezoelectric ceramic to the polarization combiner to obtain a polarization scrambler. First, the polarization beam splitter assembly decomposes the polarization direction of initial polarized light to obtain light in a first polarization state and light in a second polarization state. Next, while applying a voltage to the piezoelectric ceramic, the phase of the second polarization state light is adjusted to obtain light in a target polarization state. Finally, the PBC combines the target polarization state light with the first polarization state light to obtain scrambled polarized light. In this way, polarization scrambling of polarized light can be achieved using a single piezoelectric ceramic, polarization beam splitter assembly, and PBC, significantly reducing costs and device size. Furthermore, since only a single piezoelectric ceramic needs to be applied with voltage, the required driving voltage is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction is given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0025] Figure 1 This is a schematic diagram of distributed optical fiber sensing implementation provided by existing technology.

[0026] Figure 2 It is a structural schematic diagram of the polarization scrambler based on piezoelectric ceramics provided by the present invention.

[0027] Figure 3 It is a flow chart of the polarization scrambling method based on piezoelectric ceramics provided by the present invention.

[0028] Figure 4 It is a structural schematic diagram of the electronic device provided by the present invention.

[0029] Reference numerals:

[0030] 101: Signal transceiver; 102: Optical fiber; 103: Optical pulse; 104: Backscattered signal; 200: Piezoelectric ceramic-based polarization scrambler; 210: Polarization beam splitter assembly; 220: Piezoelectric ceramic; 230: Polarization combiner (PBC); 211: Power holding unit; 212: Polarization beam splitter (PBS); 240: Third polarization-maintaining fiber; 250: Fourth polarization-maintaining fiber. DETAILED DESCRIPTION

[0031] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0032] Fiber optic sensing technology transmits information by exploiting the property of light—its phase, intensity, and frequency—that changes in the external environment cause them to alter. Among various fiber optic sensing technologies, distributed fiber optic sensing can detect changes in environmental parameters (such as temperature and strain) at every fiber location along fiber lines up to tens of kilometers long. This technology offers the most promising solutions for a variety of scenarios, including geological disaster early warning, critical facility security, and infrastructure structural safety monitoring. Fiber optics serve as both a transmission and sensing medium, offering advantages such as light weight, compact size, excellent insulation, and resistance to electromagnetic interference, high temperatures, and corrosion.

[0033] Figure 1 This is a schematic diagram of distributed optical fiber sensing provided by existing technology, such as Figure 1 As shown, it includes a signal transceiver device 101 and an optical fiber 102 (ie Figure 1 The orange line in the middle) connects the signal transceiver device 101 to one end of the optical fiber 102, and the signal transceiver device 101 sends an optical pulse 103 to the optical fiber 102 (i.e. Figure 1 The optical fiber 102 receives a light pulse 103 (shown as the green arrow in the figure) and collects and analyzes backscattered signals 104 (shown as the red arrow in the figure) generated along the optical fiber 102, thereby detecting abnormal events along the optical fiber (such as intrusion). Distributed optical fiber sensing technology can be based on three types of backscatter: Rayleigh scattering, Raman scattering, and Brillouin scattering. Brillouin scattering-based sensing systems include Brillouin optical time-domain analyzers (BOTDAs) based on stimulated Brillouin scattering and Brillouin optical time-domain reflectometers (BOTDRs) based on spontaneous Brillouin scattering. These systems are capable of measuring temperature and strain changes over a wide dynamic range.

[0034] Both BOTDR and BOTDA systems require injecting pulsed light into the optical fiber. In order to reduce the impact of polarization fading noise on the system, the optical pulses need to be scrambled. Existing polarization scrambling technologies are divided into two categories: passive polarization scrambling and active polarization scrambling. Among them, passive polarization scrambling relies on passive devices and realizes random changes in the polarization state of the optical signal through specific optical structures. At present, the mechanism of passive polarization scrambling determines that it can only be used to scramble continuous light. Active polarization scrambling uses voltage to drive the crystal to actively disrupt the polarization state of light, so that the polarization state of the optical signal changes randomly over time. Currently, all commercial polarization scramblers are active polarization scramblers, and support scrambling of continuous light and pulsed light. There are three main types of commercial active polarization scramblers: lithium niobate crystal polarization scrambler, cylindrical piezoelectric ceramic resonant polarization scrambler and fiber extrusion type polarization scrambler. The corresponding defects of each polarization scrambler are as follows:

[0035] 1. Passive polarization scramblers cannot support pulse polarization scrambling. Furthermore, they typically require a long length of polarization-maintaining fiber, the specific length of which depends on the light source linewidth in the application scenario. This long length of polarization-maintaining fiber increases the instrument's cost and size.

[0036] 2. Active polarization scrambling, using a lithium niobate crystal polarization scrambler, utilizes the electro-optical effect of a lithium niobate crystal. By applying an external electric field to the crystal, the refractive index changes. As light passes through the crystal, the changing electric field causes the crystal's refractive index to change, thereby altering the polarization state of the light beam. Because light repeatedly passes through the optical fiber and crystal interface as it passes through the polarization scrambler, insertion loss is high. Another major disadvantage is that it typically requires a high voltage to operate. Furthermore, lithium niobate crystal polarization scramblers are complex to manufacture and expensive. Their operating temperature range is also relatively narrow. Furthermore, these polarization scramblers have high requirements for the polarization state of the incident light. Polarization scrambling is most effective when the polarization direction of the incident light is at a 45-degree angle to the direction of the applied electric field. However, achieving this ideal polarization state is difficult in practical applications. To address this issue, multiple crystal devices can be used, connected in series at different electric field angles. However, this approach further increases insertion loss and significantly increases manufacturing costs.

[0037] 3. The main principle of a cylindrical piezoelectric ceramic resonant polarization scrambler, a type of active polarization scrambling, is to wrap an optical fiber around a cylindrical piezoelectric ceramic. Applying a voltage across the piezoelectric ceramic causes the piezoelectric ceramic to deform, thereby stretching the optical fiber and causing a change in the polarization state of the transmitted light beam. The polarization scrambler achieves maximum efficiency when the voltage frequency matches the resonant frequency of the cylindrical piezoelectric ceramic. In practical applications, because the polarization scrambling effect of a single cylindrical piezoelectric ceramic is easily affected by the initial polarization state of the incident light, three cylindrical piezoelectric ceramics are often used in series to reduce the polarization sensitivity of the polarization scrambler. However, this method has the disadvantages of being bulky, having a low polarization scrambling rate, and requiring a large number of piezoelectric ceramics.

[0038] 4. Active polarization scrambling uses a fiber-squeezing polarization scrambler structure: Two piezoelectric ceramics are placed on either side of an optical fiber. When a voltage is applied to the piezoelectric ceramics, they squeeze the fiber, thereby achieving polarization modulation. This polarization scrambler typically uses four piezoelectric ceramic squeezing units connected in series to eliminate the effects of polarization sensitivity on the incident light. However, a disadvantage is that a large number of piezoelectric ceramics are required.

[0039] In view of the above-mentioned problems, the present invention provides a polarization scrambler based on piezoelectric ceramics, which realizes polarization scrambling of polarized light through a piezoelectric ceramic, a polarization beam splitter component and a PBC, significantly reducing the cost and the size of the device. In addition, it only requires applying voltage to one piezoelectric ceramic, reducing the required driving voltage.

[0040] The following combination Figure 2 The present invention describes a polarization scrambler based on piezoelectric ceramics, which can realize polarization scrambling of direct current light and pulsed light.

[0041] Figure 2 Schematic diagram of the structure of the polarization scrambler based on piezoelectric ceramics provided by the present invention, such as Figure 2 As shown, the polarization scrambler 200 based on piezoelectric ceramics includes: a polarization beam splitter component 210, a piezoelectric ceramic (PZT) 220 and a polarization combiner PBC230, wherein the polarization beam splitter component 210 is connected to the piezoelectric ceramic 220 and the PBC230 respectively, and the piezoelectric ceramic 220 is connected to the PBC230;

[0042] The polarization beam splitting component 210 is used to decompose the polarization direction of the initial polarized light to obtain a first polarization state light and a second polarization state light; the direction of the first polarization state light is perpendicular to the direction of the second polarization state light;

[0043] The piezoelectric ceramic 220 is used to adjust the phase of the second polarization state light to obtain the target polarization state light when a voltage is applied;

[0044] The PBC 230 is configured to perform polarization synthesis on the first polarization state light and the target polarization state light to obtain scrambled polarized light.

[0045] Here, the polarized light may be direct current light or pulsed light.

[0046] Here, the first polarized light may be parallel polarized light or vertical polarized light. If the first polarized light is parallel polarized light, the second polarized light is vertical polarized light; if the first polarized light is vertical polarized light, the second polarized light is parallel polarized light.

[0047] Furthermore, if the second polarization state light is parallel polarization state light, the piezoelectric ceramic adjusts the phase of the parallel polarization state light; if the second polarization state light is vertical polarization state light, the piezoelectric ceramic adjusts the phase of the vertical polarization state light.

[0048] Here, the polarization beam splitting component 210 , the piezoelectric ceramic 220 and the PBC 230 may be connected using a polarization-maintaining fiber or a single-mode fiber.

[0049] Here, the polarization beam splitting assembly 210 may include only a polarizing beam splitter (PBS 212 ), or may include the PBS 212 and other components.

[0050] It should be noted that when voltage is applied to the piezoelectric ceramic 220 , the piezoelectric ceramic 220 will continue to deform, and the optical fiber wound around the piezoelectric ceramic 220 will be continuously stretched, so that the phase of the second polarization state light in the optical fiber is adjusted to obtain the target polarization state light.

[0051] Here, the piezoelectric ceramic 220 may be lead zirconate titanate piezoelectric ceramic, and parameters of the piezoelectric ceramic 220 may include PZT outer diameter, radial displacement piezoelectric constant, driving voltage, strain sensitivity coefficient, and length of light wound around PZT.

[0052] Here, the method of applying voltage to the piezoelectric ceramic 220 may be any appropriate method, such as a function signal generator or an arbitrary signal generator.

[0053] For example, the minimum parameter requirements for the piezoelectric ceramic 220 may be that the PZT outer diameter is 40 millimeters (mm), the radial displacement piezoelectric constant is -240 picometers / volt ( pm / V), driving voltage 3.68V, strain sensitivity coefficient 110 product of strain and characteristic length / radian angle ( ), the length of the optical fiber wound on the PZT is 40 meters (m).

[0054] For example, Figure 2 As shown, the polarization beam splitting component 210 includes a power holding unit 211 and a polarization beam splitter PBS212, wherein the power holding unit 211 is connected to the PBS212, and the PBS212 is respectively connected to the piezoelectric ceramic 220 and the PBC230; the PBS212 is used to split the polarization direction of the initial polarized light to obtain the first polarization state light and the second polarization state light; the power holding unit 211 is used to maintain the difference between the optical power of the first polarization state light and the optical power of the second polarization state light to meet the preset difference.

[0055] Here, the power maintaining unit 211 may be obtained by fusing two sections of polarization-maintaining optical fibers at a preset angle.

[0056] It should be noted that optical power can be measured using an optical power meter.

[0057] For example, the upper branch of PBS212 (ie, the first polarization state light) is parallel polarization state light, and the lower branch (ie, the second polarization state light) is vertical polarization state light. The electric vector of the parallel polarization state light is It is expressed as the following formula (1):

[0058] (1)

[0059] in, yes The amplitude of the branch electric vector component in the direction, Indicates frequency, Indicates time, represents the wave number, Coordinate axis direction, represents the propagation factor, Represents the phase of the first polarization state light.

[0060] The electric vector of the vertically polarized light in the lower branch of PBS212 It is expressed as the following formula (2):

[0061] (2)

[0062] in, yes The amplitude of the branch electric vector component in the direction, Represents the phase of the second polarization state light.

[0063] The phase difference between the first polarization state light and the second polarization state light is It is expressed as the following formula (3):

[0064] (3)

[0065] Here, the power holding unit 211 may be connected to the PBS 212 via a polarization-maintaining optical fiber, or may be integrated into the PBS 212 .

[0066] Here, the preset difference value may be any appropriate value, such as 0 or a value close to 0. Generally, the closer the difference value is to 0, the closer the optical power of the light in the first polarization state is to the optical power of the light in the second polarization state.

[0067] In the embodiment of the present invention, the power maintaining unit 211 ensures that the decomposed first polarization state light and second polarization state light have equal power, thereby improving the efficiency and accuracy of the reflectometer system or analyzer system.

[0068] In an embodiment of the present invention, a polarization scrambler is achieved by connecting a polarization beam splitter assembly 210 to a piezoelectric ceramic 220 and a polarization combiner (PBC), and then connecting the piezoelectric ceramic 220 to a polarization combiner. First, the polarization direction of the initial polarized light is decomposed by the polarization beam splitter assembly 210 to obtain light in a first polarization state and light in a second polarization state. Next, when a voltage is applied to the piezoelectric ceramic 220, the phase of the second polarization state is adjusted to obtain light in a target polarization state. Finally, the first polarization state and the target polarization state are combined by the PBC to obtain polarized light after polarization scrambling. In this way, polarization scrambling of polarized light can be achieved using only a piezoelectric ceramic 220, a polarization beam splitter assembly 210, and a PBC 230, significantly reducing costs and device size. Furthermore, only a voltage needs to be applied to the piezoelectric ceramic 220, reducing the required driving voltage.

[0069] Furthermore, the power maintaining unit 211 includes a first polarization-maintaining optical fiber and a second polarization-maintaining optical fiber, wherein the first polarization-maintaining optical fiber and the second polarization-maintaining optical fiber are fused at a preset angle, and the preset angle is an angle that maintains the difference between the optical power of the first polarization state light and the optical power of the second polarization state light to meet the preset difference.

[0070] Here, the preset angle can be any suitable angle, such as 45 degrees or an angle close to 45 degrees. Generally, the closer the preset angle is to 45 degrees, the closer the power of the first polarization state light and the second polarization state light are. When the first polarization-maintaining fiber and the second polarization-maintaining fiber are fused at 45 degrees, the power of the first polarization state light and the second polarization state light are consistent. Therefore, in order to ensure that the power of the first polarization state light and the power of the second polarization state light after PBS212 decomposition are consistent, the preset angle can be set to 45 degrees.

[0071] In the embodiment of the present invention, the polarization scrambler structure is constructed using polarization-maintaining fiber, PBC, PBS212 and voltage ceramics, which eliminates the need for polarized light to enter and exit the interface between the fiber and the crystal multiple times, thereby reducing the insertion loss of the polarization scrambler.

[0072] Further, if Figure 2As shown, the polarization scrambler based on piezoelectric ceramics also includes a third polarization-maintaining fiber 240 and a fourth polarization-maintaining fiber 250. The length of the third polarization-maintaining fiber 240 is the same as that of the fourth polarization-maintaining fiber 250, wherein the third polarization-maintaining fiber 240 is respectively connected to the polarization beam splitting component 210 and the PBC230, and the fourth polarization-maintaining fiber 250 is wound on the piezoelectric ceramic 220 and has its two ends respectively connected to the polarization beam splitting component 210 and the PBC230; the third polarization-maintaining fiber 240 is used to transmit the first polarization state light; the fourth polarization-maintaining fiber 250 is used to transmit the target polarization state light.

[0073] It should be noted that, in order to achieve sufficient polarization scrambling, the piezoelectric ceramic 220 needs to ensure that the phase difference between the first polarization state light and the target polarization state light is greater than or equal to 8π.

[0074] It should be noted that when the polarization beam splitting component 210 decomposes the polarized light into the first polarization state light and the second polarization state light, the target polarization state light is transmitted through the third polarization-maintaining optical fiber 240, and the second polarization state light is transmitted through the fourth polarization-maintaining optical fiber 250. In addition, the PZT on the fourth polarization-maintaining optical fiber 250 is deformed by applying voltage, stretching the fourth polarization-maintaining optical fiber 250, changing the phase of the first polarization state light to obtain the target polarization state light, and then the PBC synthesizes the polarization state of the first polarization state light and the target polarization state light to obtain the polarized light after scrambling.

[0075] In an embodiment of the present invention, the structure of the polarization scrambler is constructed using polarization-maintaining fiber, PBC, PBS212, and voltage ceramics. This eliminates the need for polarized light to repeatedly enter and exit the interface between the fiber and the crystal, thereby reducing the insertion loss of the polarization scrambler. Compared with lithium niobate crystals with higher driving voltages and a limited operating temperature range, the required driving voltage is reduced and the applicable operating temperature is expanded.

[0076] Furthermore, the voltage applied to the piezoelectric ceramic 220 is greater than a preset voltage, which is determined based on the outer diameter of the piezoelectric ceramic 220, the length of the fourth polarization-maintaining fiber 250, and the phase difference between the target polarization state light and the first polarization state light.

[0077] Here, the preset voltage can be the ratio of the first value to the second value. The first value can be the product of the phase difference, the outer diameter of the PZT and the strain sensitivity coefficient of the optical fiber, or the weighted product of the three; the second value can be the product of the piezoelectric constant of the radial displacement and the length of the optical fiber, or the weighted product of the two.

[0078] Exemplarily, the preset voltage V is calculated as follows:

[0079] (4)

[0080] in, is the outer diameter of PZT, is the strain sensitivity coefficient of the optical fiber, is the piezoelectric constant for radially varying displacement, is the length of the optical fiber wrapped around the PZT.

[0081] In an embodiment of the present invention, the structure of the polarization scrambler is constructed using polarization-maintaining fiber, PBC, PBS212, and voltage ceramics. This eliminates the need for polarized light to repeatedly enter and exit the interface between the fiber and the crystal, thereby reducing the insertion loss of the polarization scrambler. Compared with lithium niobate crystals with higher driving voltages and a limited operating temperature range, the required driving voltage is reduced and the applicable operating temperature is expanded.

[0082] The polarization scrambling method based on piezoelectric ceramics provided by the present invention is described below. The polarization scrambling method based on piezoelectric ceramics described below and the polarization scrambler based on piezoelectric ceramics described above can be referred to each other.

[0083] Figure 3 This is a flow chart of the polarization scrambling method based on piezoelectric ceramics provided by the present invention, which is applied to the polarization scrambling instrument based on piezoelectric ceramics, such as Figure 3 As shown, the method includes:

[0084] Step 301: Obtain initial polarized light.

[0085] Step 302: Split the polarization direction of the initial polarized light by a polarization beam splitter in the polarization scrambler to obtain light in a first polarization state and light in a second polarization state.

[0086] The direction of the first polarization state light is perpendicular to the direction of the second polarization state light.

[0087] Step 303 : Adjust the phase of the second polarization state light by applying voltage to the piezoelectric ceramic in the polarization scrambler to obtain the target polarization state light.

[0088] Step 304 : Using the PBC in the polarization scrambler, the first polarization state light and the target polarization state light are subjected to polarization state synthesis to obtain scrambled polarized light.

[0089] Furthermore, the polarization beam splitting component includes a power holding unit and a polarization beam splitter PBS, and the polarization direction of the initial polarized light is decomposed by the polarization beam splitting component in the polarization scrambler to obtain the first polarization state light and the second polarization state light, including:

[0090] determining, by the power holding unit, a first amplitude corresponding to the first polarization state light and a second amplitude corresponding to the second polarization state light;

[0091] The polarization direction of the initial polarized light is split based on the first amplitude and the second amplitude by the PBS to obtain the first polarization state light and the second polarization state light.

[0092] Furthermore, the polarization scrambler further includes a third polarization-maintaining fiber and a fourth polarization-maintaining fiber, and the length of the third polarization-maintaining fiber is the same as that of the fourth polarization-maintaining fiber.

[0093] After the phase of the second polarization state light is adjusted by the piezoelectric ceramic in the polarization scrambler under the condition of applying voltage to obtain the target polarization state light, the method further includes:

[0094] Transmitting the first polarization state light to the PBC through the third polarization-maintaining optical fiber;

[0095] The target polarization state light is transmitted to the PBC through the fourth polarization-maintaining optical fiber.

[0096] Figure 4 Schematic diagram of the structure of the electronic device provided by the present invention, such as Figure 4 As shown, the electronic device may include: a processor 410, a communications interface 420, a memory 430, and a communications bus 440, wherein the processor 410, the communications interface 420, and the memory 430 communicate with each other via the communications bus 440. The processor 410 may call logic instructions in the memory 430 to execute a piezoelectric ceramic-based polarization scrambling method, which includes: obtaining initial polarized light; splitting the polarization direction of the initial polarized light using a polarization beam splitter in the polarization scrambler to obtain a first polarization state light and a second polarization state light; adjusting the phase of the second polarization state light using the piezoelectric ceramic in the polarization scrambler under the application of a voltage to obtain a target polarization state light; and combining the first polarization state light and the target polarization state light using a polarization beam splitter in the polarization scrambler to obtain a scrambled polarized light.

[0097] Furthermore, the logic instructions in the aforementioned memory 430 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the portion that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product, stored in a storage medium, includes instructions for enabling a computer device (which can be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as a USB flash drive, a mobile hard drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0098] On the other hand, the present invention also provides a computer program product, which includes a computer program, which can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer can execute the piezoelectric ceramic-based polarization scrambling method provided by the above-mentioned methods, the method including: obtaining initial polarized light; splitting the polarization direction of the initial polarized light through the polarization beam splitter component in the polarization scrambler to obtain a first polarization state light and a second polarization state light; adjusting the phase of the second polarization state light under the application of voltage through the piezoelectric ceramic in the polarization scrambler to obtain a target polarization state light; and synthesizing the polarization state of the first polarization state light and the target polarization state light through the PBC in the polarization scrambler to obtain the polarized light after polarization scrambling.

[0099] On the other hand, the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, is implemented to execute the piezoelectric ceramic-based polarization scrambling method provided by the above-mentioned methods, the method comprising: obtaining initial polarized light; splitting the polarization direction of the initial polarized light by a polarization beam splitter in the polarization scrambler to obtain a first polarization state light and a second polarization state light; adjusting the phase of the second polarization state light by applying a voltage through the piezoelectric ceramic in the polarization scrambler to obtain a target polarization state light; and synthesizing the polarization state of the first polarization state light and the target polarization state light by the PBC in the polarization scrambler to obtain the polarized light after polarization scrambling.

[0100] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, i.e., they may be located in one location or distributed across multiple network units. Some or all of the modules may be selected based on actual needs to achieve the objectives of the present embodiment. Persons of ordinary skill in the art will be able to understand and implement the present invention without inventive effort.

[0101] Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented using software plus a necessary general-purpose hardware platform, or of course, hardware. Based on this understanding, the essence of the above technical solution, or the portion that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a magnetic disk, or an optical disk, and includes a number of instructions for causing a computer device (such as a personal computer, server, or network device) to execute the methods described in each embodiment or certain portions of the embodiments.

[0102] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A polarization scrambler based on piezoelectric ceramics, characterized in that: include: A polarization beam splitting assembly, a piezoelectric ceramic, a third polarization-maintaining fiber, a fourth polarization-maintaining fiber, and a polarization combiner (PBC), wherein the third polarization-maintaining fiber and the fourth polarization-maintaining fiber have the same length, the third polarization-maintaining fiber is connected to the polarization beam splitting assembly and the PBC, respectively, and the fourth polarization-maintaining fiber is wound on the piezoelectric ceramic and has its two ends connected to the polarization beam splitting assembly and the PBC, respectively; The polarization beam splitting component is used to decompose the polarization direction of the initial polarized light to obtain a first polarization state light and a second polarization state light; the direction of the first polarization state light is perpendicular to the direction of the second polarization state light; the initial polarized light is pulsed light or direct current light; The piezoelectric ceramic is configured to adjust the phase of the second polarization state light to obtain the target polarization state light when a voltage is applied to the piezoelectric ceramic; the voltage applied to the piezoelectric ceramic is greater than a preset voltage, the preset voltage being determined based on the outer diameter of the piezoelectric ceramic, the length of the fourth polarization-maintaining optical fiber, and the phase difference between the target polarization state light and the first polarization state light; and the voltage applied to the piezoelectric ceramic varies randomly; The third polarization-maintaining optical fiber is used to transmit the first polarization state light; The fourth polarization-maintaining optical fiber is used to transmit the target polarization state light; The PBC is used to synthesize the polarization states of the first polarization state light and the target polarization state light to obtain scrambled polarized light.

2. The polarization scrambler based on piezoelectric ceramics according to claim 1, characterized in that: The polarization beam splitting assembly includes a power holding unit and a polarization beam splitter PBS, wherein the power holding unit is connected to the PBS, and the PBS is respectively connected to the piezoelectric ceramic and the PBC; The PBS is used to split the polarization direction of the initial polarized light to obtain the first polarization state light and the second polarization state light; The power maintaining unit is configured to maintain a difference between the optical power of the first polarization state light and the optical power of the second polarization state light to meet a preset difference.

3. The polarization scrambler based on piezoelectric ceramics according to claim 2, characterized in that: The power maintaining unit includes a first polarization-maintaining optical fiber and a second polarization-maintaining optical fiber, wherein the first polarization-maintaining optical fiber and the second polarization-maintaining optical fiber are fused at a preset angle, and the preset angle is an angle that maintains the difference between the optical power of the first polarization state light and the optical power of the second polarization state light to meet the preset difference.

4. A method for polarization disturbance based on piezoelectric ceramics, characterized in that: The piezoelectric ceramic-based polarization scrambler according to claim 1 comprises: Obtaining initial polarized light; the initial polarized light is pulsed light or direct current light; Splitting the polarization direction of the initial polarized light by a polarization beam splitter in the polarization scrambler to obtain a first polarization state light and a second polarization state light; the direction of the first polarization state light is perpendicular to the direction of the second polarization state light; The piezoelectric ceramic in the polarization scrambler is used to adjust the phase of the second polarization state light under the condition of applying a voltage to obtain the target polarization state light; the voltage applied to the piezoelectric ceramic is greater than a preset voltage, and the preset voltage is determined based on the outer diameter of the piezoelectric ceramic, the length of the fourth polarization-maintaining optical fiber, and the phase difference between the target polarization state light and the first polarization state light; the voltage applied to the piezoelectric ceramic varies randomly; transmitting the first polarization state light to the PBC through a third polarization-maintaining optical fiber in the polarization scrambler; The target polarization state light is transmitted to the PBC through the fourth polarization maintaining fiber in the polarization scrambler The first polarization state light and the target polarization state light are polarization-synthesized by the PBC in the polarization scrambler to obtain scrambled polarized light.

5. The polarization scrambling method based on piezoelectric ceramics according to claim 4, characterized in that: The polarization beam splitting component includes a power holding unit and a polarization beam splitter PBS, and the polarization direction of the initial polarized light is decomposed by the polarization beam splitting component in the polarization scrambler to obtain a first polarization state light and a second polarization state light, including: determining, by the power holding unit, a first amplitude corresponding to the first polarization state light and a second amplitude corresponding to the second polarization state light; The polarization direction of the initial polarized light is split based on the first amplitude and the second amplitude by the PBS to obtain the first polarization state light and the second polarization state light.

6. An electronic device comprising a memory, a processor, and a computer program stored in the memory and running on the processor, characterized in that: When the processor executes the computer program, the piezoelectric ceramic-based polarization scrambling method according to claim 4 or 5 is implemented.

7. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the piezoelectric ceramic-based polarization scrambling method according to claim 4 or 5 is implemented.

Images