Method, device and equipment for inhibiting stimulated Brillouin effect in optical fiber

Abstract

The invention provides a method, a device and equipment for inhibiting a stimulated Brillouin effect in an optical fiber. The method for inhibiting the stimulated Brillouin effect in the optical fiber comprises the following steps: acquiring an optical fiber to be processed; drawing the to-be-processed optical fiber into an e index distribution shape according to a preset optical fiber drawing rate to obtain a drawn optical fiber; the radius of the drawn optical fiber changes periodically; the preset optical fiber drawing rate is obtained based on a substance conservation equation. According to the invention, a relay station does not need to be additionally arranged, and the problem is directly solved at the optical fiber design level, so that the communication cost for inhibiting the stimulated Brillouin scattering SBS effect is remarkably reduced; and secondly, the Brillouin gain spectrum is split into a plurality of peaks through the periodic optical fiber structure, and the Brillouin gain is dispersed, so that the threshold value of the SBS effect is improved, higher incident power is allowed, the obvious SBS effect is not caused, and the signal quality is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of optical fiber communication and sensing, and particularly relates to a method, device and equipment for suppressing the stimulated Brillouin effect in an optical fiber. Background Art

[0002] With the rapid development of modern information technology, the demand for network bandwidth in data services and transmissions is increasing day by day. The wide application of metropolitan area networks, access networks, and Fiber To The Home (FTTH) technologies has promoted the rise of all-optical networks. People have put forward requirements for ultra-high capacity, ultra-high speed, and ultra-long distance in optical fiber communication transmission systems. However, with the increase in transmission capacity, the incident power of the optical fiber also increases, resulting in non-linear effects in the optical fiber (such as Stimulated Raman Scattering (SRS), Stimulated Brillouin Scattering (SBS), Self-Phase Modulation (SPM), and Cross-Phase Modulation (XPM), etc.) becoming non-negligible. Especially SBS, due to its low threshold characteristic, has a significant impact on long-distance optical fiber communication, reducing the quality of the transmitted optical signal. In the next-generation Passive Optical Network (PON) technology, due to the increase in power spectral density, the SBS problem is particularly prominent and becomes a key technical problem that needs to be overcome.

[0003] In the prior art, to solve the non-linear effect problem in optical fiber communication, especially the SBS effect, researchers have proposed various solutions. For example, using ultra-low loss optical fibers (such as G.652D or G.654E) to reduce the loss during signal transmission; optimizing the optical fiber manufacturing process to reduce micro-bending loss; using Erbium-Doped Fiber Amplifier (EDFA) and Raman Amplifier to enhance the signal intensity; and using high-order modulation technologies (such as Quadrature Amplitude Modulation, 16-QAM or 64-QAM) and Dense Wavelength Division Multiplexing (DWDM) technology to improve bandwidth utilization. In addition, the use of Large Effective Area Fiber (LEAF) has also been proven to effectively reduce the power density, thereby reducing the occurrence of non-linear effects. These technologies have achieved certain results in improving the performance and stability of optical fiber communication systems.

[0004] However, there are still some deficiencies in the prior art. First, the method of increasing the number of relay stations to reduce the transmitting end power can alleviate the nonlinear effect, but significantly increases the communication cost. Second, with the increase of the optical fiber incident power, the nonlinear effect (especially the SBS effect) still has an adverse impact on the signal quality, resulting in poor signal at the output end. In addition, the backward propagating Stokes wave generated by the SBS effect not only reduces the signal quality, but may also damage the optical fiber light source and the end face. Therefore, how to effectively increase the threshold of SBS in the optical fiber and extend the optical fiber communication distance without significantly increasing the cost is still a technical problem to be solved urgently in the current optical fiber communication field. Summary of the Invention

[0005] In order to solve the above problems existing in the prior art, the present invention provides a method, device and equipment for suppressing the stimulated Brillouin effect in optical fiber.

[0006] The technical problems to be solved by the present invention are realized through the following technical solutions:

[0007] In a first aspect, the present invention provides a method for suppressing the stimulated Brillouin effect in optical fiber, including:

[0008] Obtain the optical fiber to be processed;

[0009] Pull the optical fiber to be processed into an e-exponential distribution shape at a preset optical fiber drawing rate to obtain the drawn optical fiber; the drawn optical fiber exhibits a periodic radius change;

[0010] The preset optical fiber drawing rate is obtained based on the mass conservation equation.

[0011] Optionally, the radius of the drawn optical fiber is expressed as:

[0012]

[0013] where x represents the distance between the initial optical fiber cross-section and any current radius position to be measured within half a period of the drawn optical fiber; D(x) represents the radius value of the drawn optical fiber at the position of distance x, D1 represents the radius size of the initial optical fiber cross-section within half a period of the drawn optical fiber, D2 represents the radius size of the end optical fiber cross-section within half a period of the drawn optical fiber; e represents the base of the exponential function, represents the drawing control variable; L represents the length of the drawn optical fiber within half a period;

[0014] where any current radius position to be measured represents any position point between the initial optical fiber cross-section and the end optical fiber cross-section within half a period.

[0015] Optionally, the drawing control variable is expressed as:

[0016]

[0017] Wherein, k represents the fiber radius control coefficient.

[0018] Optionally, the preset fiber drawing rate is expressed as:

[0019]

[0020] M = D(x) 2 *v;

[0021] Wherein, v represents the value of the preset fiber drawing rate, v1 represents the initial rate of the fiber, M represents the first parameter, Q represents the second parameter, t represents the drawing duration, represents the drawing control variable.

[0022] Optionally, the second parameter is expressed as:

[0023]

[0024] D1 represents the radius of the initial fiber cross-section of the drawn fiber within half a period, D2 represents the radius of the end fiber cross-section of the drawn fiber within half a period; e represents the base of the exponential function, represents the drawing control variable; L represents the length of the drawn fiber within half a period.

[0025] Optionally, the length of the drawn fiber in one period is between 50 mm and 100 mm.

[0026] Optionally, the fiber to be processed is a G.652D fiber or a G.654E fiber.

[0027] In a second aspect, the present invention provides an apparatus for suppressing stimulated Brillouin effect in an optical fiber, including: an acquisition unit and a drawing unit;

[0028] The acquisition unit is configured to: acquire the fiber to be processed;

[0029] The drawing unit is configured to: draw the fiber to be processed into an e-exponential distribution shape at the preset fiber drawing rate to obtain the drawn fiber; the drawn fiber exhibits periodic radius changes;

[0030] The preset fiber drawing rate is obtained based on the mass conservation equation.

[0031] In a third aspect, the present invention provides a device for suppressing the stimulated Brillouin effect in an optical fiber, including: a processor, a storage medium, and a bus. The storage medium stores machine-readable instructions executable by the processor. When the device for suppressing the stimulated Brillouin effect in the optical fiber runs, the processor communicates with the storage medium through the bus, and the processor executes the machine-readable instructions to perform the steps of the method for suppressing the stimulated Brillouin effect in the optical fiber as described in the first aspect above.

[0032] The present invention provides a method, apparatus, and device for suppressing the stimulated Brillouin effect in an optical fiber. Among them, a method for suppressing the stimulated Brillouin effect in an optical fiber includes: obtaining an optical fiber to be processed; pulling the optical fiber to be processed into an e-exponential distribution shape at a preset optical fiber drawing rate to obtain the drawn optical fiber; the drawn optical fiber exhibits a periodic radius change; the preset optical fiber drawing rate is obtained based on the mass conservation equation. In the present invention, since there is no need to additionally add a relay station and the problem is directly solved at the optical fiber design level, the communication cost of suppressing the stimulated Brillouin scattering (SBS) effect is significantly reduced. Secondly, the Brillouin gain spectrum is split into multiple peaks through the periodic optical fiber structure, dispersing the Brillouin gain, thereby increasing the threshold of the SBS effect, allowing a higher incident power without triggering a significant SBS effect, and improving the signal quality. Secondly, through suppressing the SBS effect, the generation of Stokes waves is reduced, thereby protecting the optical fiber light source and the end face, and extending the service life of the device. Finally, this solution enables the signal to be transmitted over a longer distance at a higher power while maintaining a high signal quality, thereby extending the effective distance of optical fiber communication. In summary, through the drawing of the e-exponential distribution shape, the present invention designs a periodic optical fiber structure, effectively increasing the SBS threshold, suppressing the nonlinear effect, reducing the damage of Stokes waves, and extending the optical fiber communication distance without adding a relay station and cost, solving the key technical problems in the current optical fiber communication field.

[0033] The following will further describe the present invention in detail with reference to the drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic flowchart of a method for suppressing the stimulated Brillouin effect in an optical fiber provided by an embodiment of the present invention;

[0035] Figure 2 Exemplarily shows a schematic structural diagram of the drawn optical fiber;

[0036] Figure 3 Exemplarily shows a schematic diagram of the acoustic displacement field distribution of a low-order longitudinal acoustic mode;

[0037] Figure 4 Exemplarily shows a schematic diagram of the results of the Brillouin gain coefficient corresponding to different radius cross-sections;

[0038] Figure 5 Exemplarily, a schematic diagram of the propagation of pump light and Stokes light power at multiple frequencies is shown;

[0039] Figure 6 A schematic structural diagram of a device for suppressing stimulated Brillouin effect in an optical fiber provided by an embodiment of the present invention;

[0040] Figure 7 A schematic structural diagram of a device for suppressing stimulated Brillouin effect in an optical fiber provided by an embodiment of the present invention. Specific embodiments

[0041] Traditional optical fiber solutions for suppressing the SBS effect more or less have problems of cost or implementation difficulties. The present invention starts from the structure of the optical fiber. Since different fiber radii will produce different Brillouin gain spectra and also different Stokes lights. Therefore, if the fiber structure is periodically drawn, multiple Brillouin gain spectra will be generated in the optical fiber. Therefore, when Stokes lights of different frequencies pass through different regions of the optical fiber, their gains are also different. By reasonably controlling the radius structure of the optical fiber, the SBS effect can be suppressed as a whole.

[0042] The following further describes the present invention in detail with specific embodiments, but the embodiments of the present invention are not limited thereto.

[0043] In order to reduce the communication cost of suppressing the stimulated Brillouin scattering (SBS) effect and increase the threshold of the SBS effect, an embodiment of the present invention provides a method for suppressing the stimulated Brillouin effect in an optical fiber. Figure 1 A schematic flow diagram of a method for suppressing the stimulated Brillouin effect in an optical fiber provided by an embodiment of the present invention, as Figure 1 shown, includes:

[0044] S101. Obtain an optical fiber to be processed.

[0045] S102. Draw the optical fiber to be processed into an e-exponential distribution shape at a preset optical fiber drawing rate to obtain the drawn optical fiber.

[0046] The drawn optical fiber exhibits periodic radius changes; the preset optical fiber drawing rate is obtained based on the mass conservation equation.

[0047] An embodiment of the present invention provides a method for suppressing stimulated Brillouin effect in an optical fiber. The optical fiber to be processed is drawn into an e-exponential distribution shape at a preset optical fiber drawing rate to obtain the drawn optical fiber; the drawn optical fiber exhibits a periodic radius change. Since there is no need to additionally increase a relay station and the problem is directly solved at the optical fiber design level, the communication cost of suppressing stimulated Brillouin scattering (SBS) effect is significantly reduced; secondly, the Brillouin gain spectrum is split into multiple peaks by the periodic optical fiber structure, dispersing the Brillouin gain, thereby increasing the threshold of the SBS effect, allowing a higher incident power without triggering a significant SBS effect, and improving the signal quality. Secondly, by suppressing the SBS effect, this solution reduces the generation of Stokes waves, thereby protecting the optical fiber light source and end face and extending the equipment life; finally, this solution enables the signal to be transmitted over a longer distance at a higher power while maintaining a high signal quality, thereby extending the effective distance of optical fiber communication. In summary, through the drawing of the e-exponential distribution shape, the present invention designs a periodic optical fiber structure, effectively increases the SBS threshold, suppresses the nonlinear effect, reduces the damage of Stokes waves, and extends the optical fiber communication distance without increasing relay stations and costs, solving the key technical problems in the current optical fiber communication field. Figure 2 Exemplarily, a schematic structural diagram of the drawn optical fiber is shown, such as Figure 2 shown, the radius of the drawn optical fiber exhibits a periodic structural change.

[0048] It should be noted that by using the method for suppressing stimulated Brillouin effect in an optical fiber provided by the embodiment of the present invention, the obtained drawn optical fiber can transfer higher energy to the destination, not only can suppress SBS, but also can suppress the FWM (four wave mixing) nonlinear effect. In terms of application, the drawn optical fiber can be applied to other medium and short-distance optical fiber transmission scenarios, and also has application potential in other fields such as optical fiber power supply, laser processing, and optical fiber sensing.

[0049] Optionally, the radius corresponding to the drawn optical fiber is expressed as:

[0050]

[0051] wherein, x represents the distance between the initial optical fiber cross-section and any current measured radius position within half a period of the drawn optical fiber; D(x) represents the radius value of the drawn optical fiber at the position of distance x, D1 represents the radius size of the initial optical fiber cross-section within half a period of the drawn optical fiber, D2 represents the radius size of the end optical fiber cross-section within half a period of the drawn optical fiber; e represents the base of the exponential function, represents the drawing control variable; L represents the length of the drawn optical fiber within half a period;

[0052] Among them, any current radius position to be measured represents any position point between the initial optical fiber cross-section and the end optical fiber cross-section within half a period.

[0053] Optionally, the drawing control variable is expressed as:

[0054]

[0055] Among them, k represents the optical fiber radius control coefficient.

[0056] Optionally, the preset optical fiber drawing rate is expressed as:

[0057]

[0058] M = D(x) 2 *v;

[0059] Among them, v represents the value of the preset optical fiber drawing rate, v1 represents the initial rate of the optical fiber, M represents the first parameter, q represents the second parameter, t represents the drawing duration, represents the drawing control variable.

[0060] Optionally, the second parameter is expressed as:

[0061]

[0062] D1 represents the radius size of the initial optical fiber cross-section of the drawn optical fiber within half a period, D2 represents the radius size of the end optical fiber cross-section of the drawn optical fiber within half a period; e represents the base of the exponential function, represents the drawing control variable; L represents the length of the drawn optical fiber within half a period.

[0063] Optionally, the length of the drawn optical fiber in one period is between 50 mm and 100 mm.

[0064] Optionally, the optical fiber to be processed is G.652D optical fiber or G.654E optical fiber.

[0065] In order to more clearly illustrate the influence of a method for suppressing the stimulated Brillouin effect in an optical fiber provided by the present invention on the threshold of SBS in the optical fiber, the embodiments of the present invention perform the calculation of the threshold to verify the effectiveness of the method of the present invention, as follows:

[0066] Under the e-exponential radius distribution shape, the calculation of the Brillouin gain spectrum is performed to obtain the Brillouin gain spectra G of multiple radius cross-sections z(v). The specific process can be summarized as follows: taking multiple radius cross-sections in the shape of the e-exponential radius distribution according to a preset step size; calculating the Brillouin gain spectrum of the optical fiber under the e-exponential radius distribution based on the above multiple radius cross-sections and the acoustic wave particle displacement vector equation in the finite element simulation method to obtain the Brillouin gain spectrum G corresponding to each radius cross-section z (v).

[0067] After the optical fiber drawing is completed, the Brillouin gain spectrum of the drawn optical fiber structure can be calculated. For the stimulated Brillouin phenomenon in the optical fiber, first, the Brillouin acoustic mode propagating in the optical fiber is numerically simulated by the finite element method. There are the following formulas for the simulation of the acoustic mode. In the present invention, the following second-order strain and stress tensor equalities are coupled into the finite element calculation software COMSOL, and the material parameters of general communication optical fibers are selected and confirmed to obtain specific results as Figure 3 shown. As Figure 3 shown, L 0m group of acoustic modes has only one mode field distribution. For other order acoustic modes, each mode corresponds to two mode field distributions, but their frequencies are very close. The acoustic field distribution obtained by calculation can be used to calculate ξ in the subsequent formula m (r).

[0068]

[0069] In the formula, s and T respectively represent the second-order strain and stress tensors of the drawn optical fiber material (the subscripts x, y, z respectively represent the coordinate values corresponding to the Cartesian coordinate system in the transverse, longitudinal, and vertical directions), and C is the stiffness matrix of the medium. The specific calculation method is as follows:

[0070]

[0071] where E0 is the Young's modulus corresponding to the drawn optical fiber, and σ is the Poisson's ratio. Through the calculation of the COMSOL software, the optical fundamental mode field f(r) and the m-th order acoustic mode field distribution ξ m (r) can be obtained. Then, the Brillouin gain spectra at different radii can be simulated to obtain:

[0072]

[0073] where g z represents the Brillouin peak gain coefficient. In the formula, Δv z represents the full width at half maximum (FWHM) of the Lorentzian gain distribution, generally 30 - 50 MHz and related to the phonon lifetime in the material, v0 represents the Brillouin phonon frequency, V represents the Brillouin phonon frequency at different radii, neff represents the effective refractive index, p 12represents the longitudinal photoelastic coefficient, ρ is the material density, and c is the speed of light. G z (V) represents the Brillouin gain spectrum, and v represents the wavelength. Figure 4 The result schematic diagram of the Brillouin gain coefficient corresponding to different radius cross-sections is exemplarily shown. Figure 4 Figure (a) of Figure 4 Figure (b) of Figure 4 Figure (c) of respectively show the Brillouin gain coefficients corresponding to a radius of 2 μm, a radius of 2.5 μm, and a radius of 3 μm. The abscissa represents the Brillouin frequency, and the ordinate represents the Brillouin gain coefficient. As Figure 4 shown, with different cross-section radii, the corresponding values of the Brillouin gain coefficient are also different.

[0074] Based on the above steps, the Brillouin gain spectra G z (V) of multiple radius cross-sections are used to calculate the threshold P p .

[0075] In addition, the embodiments of the present invention optimize the existing threshold formula. The specifically optimized threshold formula is expressed as:

[0076]

[0077] Among them, P p is the pump light power, that is, the threshold, P s is the Stokes light power, and α is the loss coefficient. V i represents the Brillouin phonon frequency of the i-th radius cross-section, n represents the total number of radius cross-sections, λ n is the phonon wavelength under the n-th radius interface, G z (V n ) represents the Brillouin gain spectrum corresponding to the Brillouin phonon frequency taking V n , P S (λ n ) represents the Stokes light power corresponding to the phonon wavelength taking λ n , and x represents the distance between the initial fiber cross-section and any current radius position to be measured within half a period of the drawn fiber.

[0078] For the above threshold formula, it can be seen that the parameters in the original equation set, except for the loss coefficient α, are all related to the Stokes light wavelength. Therefore, for the parameter G z (V n) It will change with different wavelengths, that is, different cross-sectional radii, and will change with distance in the entire variable-radius optical fiber. Among them, it is particularly worth noting that during the entire transmission process of the pump light, the pump light will interact with Stokes light of different wavelengths. Although most of the Stokes light transmitted in the reverse direction will not be greatly amplified, this effect cannot be ignored during long-distance transmission.

[0079] After obtaining the threshold formula, specific experiments were carried out using actual optical fibers. The pump light wavelength was selected as 1.55 μm, the radius of the optical fiber was initially set to change exponentially, the changing range of the radius was 125 - 62.5 μm, the case of k = -4 was selected, a change period was controlled to be 50 m, and the total transmission distance was 10 km. The threshold formula was written and calculated through python, and the specific results are as Figure 5 shown. As Figure 5 can be seen, the blue line above represents the power change of the pump light along the optical fiber, which gradually decays along the propagation direction of the optical fiber. The other curves below represent the propagation power of Stokes light of different frequencies along the optical fiber, which increases in the reverse direction of the optical fiber.

[0080] When k = -4, the calculated threshold is approximately around 4.1 mW. Compared with the threshold of traditional optical fibers in the case of a radius of 62.5 μm, the threshold of the optical fiber drawn by the method of the present invention is increased by approximately 6 times. It can be found that the power of the reverse Stokes light is multi-frequency. Although the optical frequencies do not differ much, due to the multi-frequencies being different, the gain effect can suppress the reverse-transmitted Stokes light in the entire optical fiber. On the other hand, the light of different frequencies enables this structure to be applied to fields such as optical fiber sensing to a certain extent, which will not be elaborated here specifically.

[0081] The method provided by the embodiments of the present invention can be applied to electronic devices. Specifically, the electronic device can be: a desktop computer, a portable computer, a smart mobile terminal, a server, etc., which are not limited in the embodiments of the present invention.

[0082] Based on the same inventive concept, the embodiments of the present invention also provide a device for suppressing the stimulated Brillouin effect in an optical fiber. Figure 6 is a schematic structural diagram of a device for suppressing the stimulated Brillouin effect in an optical fiber provided by the embodiments of the present invention, as Figure 6 shown, including: an acquisition unit 601 and a drawing unit 602;

[0083] The acquisition unit 601 is used for: acquiring the optical fiber to be processed;

[0084] The drawing unit 602 is configured to: draw the optical fiber to be processed into an e-exponential distribution shape at a preset optical fiber drawing rate to obtain the drawn optical fiber; the drawn optical fiber exhibits periodic radius variations;

[0085] The preset optical fiber drawing rate is obtained based on the mass conservation equation.

[0086] Figure 7 The figure is a schematic structural diagram of a device for suppressing the stimulated Brillouin effect in an optical fiber according to an embodiment of the present invention, including: a processor 710, a storage medium 720, and a bus 730. The storage medium 720 stores machine-readable instructions executable by the processor 710. When the device for suppressing the stimulated Brillouin effect in the optical fiber runs, the processor 710 communicates with the storage medium 720 through the bus 730, and the processor 710 executes the machine-readable instructions to perform the steps of the above method embodiment. The specific implementation manners and technical effects are similar and will not be elaborated here.

[0087] The storage medium may include a random access memory (RAM), or may also include a non-volatile memory (NVM), such as at least one disk memory. Optionally, the storage medium may also be at least one storage device located far from the aforementioned processor.

[0088] The above-mentioned processor may be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it may also be a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components.

[0089] It should be noted that the terms "first", "second", etc. are used to distinguish similar objects and do not necessarily have to be used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances so that the embodiments of the present invention described here can be implemented in an order other than those illustrated or described here. The implementation manners described in the following exemplary embodiments do not represent all implementation manners consistent with the present invention. On the contrary, they are only examples of devices and methods consistent with some aspects of the present invention.

[0090] In the description of this specification, the description referring to terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples", etc. means that the specific features or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine the different embodiments or examples described in this specification.

[0091] Although the present invention has been described in connection with various embodiments herein, however, in the process of implementing the claimed invention, those skilled in the art can understand and implement other variations of the above-described disclosed embodiments by viewing the drawings and the disclosure. In the description of the present invention, the term "including" does not exclude other components or steps, the term "a" or "one" does not exclude a plurality of cases, and the meaning of "a plurality" is two or more, unless otherwise specifically defined. In addition, certain measures are described in different embodiments, but this does not mean that these measures cannot be combined to produce good effects.

[0092] The above content is a further detailed description of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is only limited to these descriptions. For those of ordinary skill in the technical field to which the present invention pertains, without departing from the concept of the present invention, several simple deductions or substitutions can be made, and all should be regarded as belonging to the protection scope of the present invention.

Claims

1. A method for suppressing stimulated Brillouin effect in optical fibers, characterized in that, Including: Obtain the optical fiber to be processed; Pull the optical fiber to be processed into an e-exponential distribution shape at a preset optical fiber drawing rate to obtain the drawn optical fiber; The drawn optical fiber exhibits periodic radius changes; The preset optical fiber drawing rate is obtained based on the mass conservation equation.

2. The method for suppressing stimulated Brillouin effect in an optical fiber according to claim 1, wherein, The radius of the drawn optical fiber is expressed as: where x represents the distance between the initial optical fiber cross-section and any current radius position to be measured within half a period of the drawn optical fiber; D(x) represents the radius value of the drawn optical fiber at the position x, D1 represents the radius of the initial optical fiber cross-section of the drawn optical fiber within half a period, D2 represents the radius of the end optical fiber cross-section of the drawn optical fiber within half a period; e represents the base of the exponential function, ζ represents the drawing control variable; L represents the length of the drawn optical fiber within half a period; where the any current radius position to be measured represents any position point between the initial optical fiber cross-section and the end optical fiber cross-section within half a period.

3. The method for suppressing stimulated Brillouin effect in an optical fiber according to claim 2, wherein The drawing control variable is expressed as: where k represents the optical fiber radius control coefficient.

4. The method for suppressing stimulated Brillouin effect in an optical fiber according to claim 1, wherein The preset optical fiber drawing rate is expressed as: M = D(x) 2 *v; where v represents the value of the preset optical fiber drawing rate, v1 represents the initial rate of the optical fiber, M represents the first parameter, Q represents the second parameter, t represents the drawing duration, and ζ represents the drawing control variable.

5. The method for suppressing the stimulated Brillouin effect in an optical fiber according to claim 4, wherein The second parameter is expressed as: D1 represents the radius of the initial optical fiber cross-section of the drawn optical fiber within half a period, D2 represents the radius of the end optical fiber cross-section of the drawn optical fiber within half a period; e represents the base of the exponential function, ζ represents the drawing control variable; L represents the length of the drawn optical fiber within half a period.

6. The method for suppressing stimulated Brillouin effect in an optical fiber according to claim 1, wherein The length of the drawn optical fiber in one period is between 50 mm and 100 mm.

7. The method for suppressing stimulated Brillouin effect in an optical fiber according to claim 1, wherein The optical fiber to be processed is G.652D optical fiber or G.654E optical fiber.

8. An apparatus for suppressing stimulated Brillouin effect in an optical fiber, characterized in that Including: An acquisition unit and a drawing unit; The acquisition unit is configured to: obtain the optical fiber to be processed; The drawing unit is configured to: pull the optical fiber to be processed into an e-exponential distribution shape at a preset optical fiber drawing rate to obtain the drawn optical fiber; the drawn optical fiber exhibits periodic radius changes; The preset optical fiber drawing rate is obtained based on the mass conservation equation.

9. An apparatus for suppressing stimulated Brillouin effect in an optical fiber, characterized in that, Including: A processor, a storage medium, and a bus. The storage medium stores machine-readable instructions executable by the processor. When the device for suppressing the stimulated Brillouin effect in the optical fiber runs, the processor communicates with the storage medium through the bus, and the processor executes the machine-readable instructions to perform the steps of the method for suppressing the stimulated Brillouin effect in the optical fiber according to any one of claims 1-7.

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