A fiber bias compensation PMD twisting device

Abstract

The present invention discloses a PMD twisting device for optical fiber bias compensation, which comprises: a PMD twisting device for applying twisting to an optical fiber through mechanical swing; a diameter gauge, arranged below the PMD twisting device, for measuring the diameter of the optical fiber; a bias compensation device, arranged below the diameter gauge, for compensating and adjusting the twisting of the optical fiber after twisting; a traction mechanism, connected to the bias compensation device, for traction of the optical fiber; a control unit, for obtaining the PMD coefficient of the optical fiber, and controlling the PMD twisting device and the bias compensation device according to the PMD coefficient. The present invention coordinates and controls the PMD twisting device and the bias compensation device through the control unit. When the PMD test data of the optical fiber is poor, the twisting process of the optical fiber can be adjusted online, so that the performance of the produced optical fiber is better, and the transmission performance of the produced optical fiber is effectively reduced due to polarization mode dispersion. In addition, the bias compensation device can be used to perform compensation and adjustment at any time according to the PMD test data, which greatly improves the adjustment efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of optical fiber manufacturing and processing, and in particular to an optical fiber bias compensation PMD twisting device. Background Art

[0002] PMD is the abbreviation of Polarization Mode Dispersion. It is a distortion phenomenon of optical signals in optical fiber transmission, which is caused by factors such as fiber non-uniformity and stress. Due to factors such as fiber non-uniformity and stress, optical signals will propagate at different speeds during transmission, resulting in different times for optical signals of different polarization modes to reach the destination. This time delay difference will cause the optical signal to diffuse and expand, thus affecting the transmission quality and reliability of the optical signal. The fundamental mode in a single-mode optical fiber contains two mutually perpendicular polarization modes. During the propagation along the optical fiber, it is difficult to ensure an absolute circle due to the influence of various factors during the optical fiber processing. At the same time, when light is transmitted in the optical fiber in the form of electromagnetic waves, it is affected by external factors, such as different temperatures and stress, which causes the two modes to couple, and their propagation speeds are also different, resulting in optical pulse broadening, and the amount of broadening is also uncertain, which produces random dispersion. With the increase of transmission rate, the influence of dispersion on communication systems is getting bigger and bigger.

[0003] The most effective way to reduce the PMD of single-mode optical fiber is to use fiber twisting technology, which has two methods: single-wheel twisting and double-wheel twisting. However, the above two methods have many disadvantages. For example, when the collimation of the single-wheel twisting device is slightly offset, the twisting stability is insufficient, and the online adjustment effect is not very ideal due to the unidirectional force, and it is often necessary to stop the line and recalibrate. The double-wheel twisting device is prone to mechanical damage to the twisting wheel and has a short service life. When twisting the optical fiber, it is easy to cause damage to the optical fiber due to the support method. In severe cases, it causes fiber breakage, affecting production efficiency and optical fiber strength. Therefore, a twisting device that can retain single-wheel twisting without damaging the optical fiber, has a long service life, and has stable polarization mode dispersion PMD values ​​and online high-efficiency adjustment is sought. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a fiber bias compensation PMD twisting device, comprising:

[0005] PMD twisting device, used to apply twist to the optical fiber through mechanical swing;

[0006] A diameter gauge is arranged below the PMD twisting device, and is used to measure the diameter of the optical fiber;

[0007] A bias compensation device is arranged below the caliper, and is used to compensate and adjust the twist of the twisted optical fiber;

[0008] A traction mechanism connected to the bias compensation device, the traction mechanism being used to traction the optical fiber;

[0009] The control unit is used to obtain the PMD coefficient of the optical fiber and control the PMD twisting device and the bias compensation device according to the PMD coefficient.

[0010] Further, the PMD twisting device comprises:

[0011] The upper positioning wheel is a V-shaped wheel, and the upper positioning wheel is used to fix the position of the upper part of the optical fiber;

[0012] The twisting wheel is a V-shaped wheel, which is arranged below the upper positioning wheel and is used to adjust the twisting angle of the optical fiber;

[0013] A twisting angle adjustment motor is connected to the twisting wheel, and the twisting angle adjustment motor is used to adjust the torsion angle and the switching time of the twisting wheel;

[0014] The lower positioning wheel is a U-shaped wheel, which is arranged below the twisting wheel and is used to fix the position of the lower part of the optical fiber;

[0015] The collimation adjustment device is connected to the upper positioning wheel and the lower positioning wheel respectively, and the collimation adjustment device is used to adjust the upper positioning wheel and the lower positioning wheel.

[0016] Furthermore, the bias compensation device comprises:

[0017] Fixed base;

[0018] A compensation wheel, which is a V-shaped wheel, is arranged above the fixed base, and is used to compensate and adjust the torsion of the optical fiber;

[0019] A deflection angle adjustment motor is arranged on the fixed base, and the deflection angle adjustment motor is used to electrically adjust and compensate for the torsion angle of the compensation wheel;

[0020] The compensation wheel adjustment device is connected to the deflection angle adjustment motor, and the compensation wheel adjustment device is used to manually adjust and compensate for the torsion angle of the compensation wheel.

[0021] Furthermore, the traction mechanism comprises:

[0022] The tension wheel is a U-shaped wheel used to release the torque of the optical fiber;

[0023] A traction machine is connected to the tension wheel, and is used for traction of the optical fiber after the torque is released.

[0024] Furthermore, the diameter of the compensation wheel is larger than that of the twisting wheel.

[0025] Furthermore, the control unit comprises:

[0026] An acquisition module is used to acquire the PMD coefficient data of the optical fiber and transmit these data parameters to the processing module;

[0027] A processing module, electrically connected to the acquisition module, and configured to set working state instructions of the PMD twisting device and the bias compensation device according to the data;

[0028] A control module is electrically connected to the processing module, and is used to control the PMD twisting device and the bias compensation device according to the working state instruction set by the processing module.

[0029] Furthermore, the processing module is used to:

[0030] The processing module is specifically used to set the standard PMD coefficient S0, and the processing module is also used to obtain the PMD coefficient △S. The processing module is also used to set the first preset coefficient difference S1, the second preset coefficient difference S2, the third preset coefficient difference g3 and the fourth preset coefficient difference S4, and S1<S2<S3<S4; the processing module is also used to set the first preset working parameter matrix A1 (a1, b1), the second preset working parameter matrix A2 (a2, b2), the third preset working parameter matrix A3 (a3, b3) and the fourth preset working parameter matrix A4 (a4, b4), wherein a1-a4 are the first to fourth rubbing wheel torsion angles, and a1<a2<a3<a4, b1-b4 are the first to fourth compensation wheel torsion angles, and b1<b2<b3<b4;

[0031] According to the difference between the acquired PMD coefficient △S and the set standard PMD coefficient S0, a preset working parameter matrix Ai is selected as the working parameter of the PMD twisting device and the bias compensation device;

[0032] When △S-S0≤S1, the first preset working parameter matrix A1 is selected as the working parameters of the PMD twisting device and the bias compensation device;

[0033] When S1<△S-S0≤S2, the second preset working parameter matrix A2 is selected as the working parameters of the PMD twisting device and the bias compensation device;

[0034] When S2<△S-S0≤S3, the third preset working parameter matrix A3 is selected as the working parameters of the PMD twisting device and the bias compensation device;

[0035] When S3<ΔS-S0≤S4, the fourth preset working parameter matrix A4 is selected as the working parameters of the PMD twisting device and the bias compensation device.

[0036] Compared with the prior art, the optical fiber bias compensation PMD twisting device according to the embodiment of the present invention has the following beneficial effects:

[0037] The present invention coordinates and controls the PMD twisting device and the bias compensation device through a control unit. When the PMD test data of the optical fiber is poor, the twisting process of the optical fiber can be adjusted online to make the performance of the produced optical fiber better, effectively reducing the influence of polarization mode dispersion on the transmission performance of the produced optical fiber, and the bias compensation device can be used to perform compensation adjustment at any time according to the PMD test data, thereby greatly improving the adjustment efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 1 is a schematic structural diagram of a fiber bias compensation PMD twisting device in an embodiment of the present invention;

[0039] Figure 2 Schematic diagram of the composition of a control unit of a fiber bias compensation PMD twisting device in an embodiment of the present invention;

[0040] In the figure, 1. optical fiber; 2. upper positioning wheel; 3. twisting angle adjustment motor; 4. twisting wheel; 5. lower positioning wheel; 6. collimation adjustment device; 7. diameter gauge; 8. compensation wheel; 9. deflection angle adjustment motor; 10. compensation wheel adjustment device; 11. fixed base; 12. tension wheel; 13. traction machine. DETAILED DESCRIPTION

[0041] The specific implementation methods of the present application are further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0042] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0043] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0044] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0045] like Figure 1 As shown, in an embodiment of the present application, a fiber bias compensation PMD twisting device is provided, comprising: a PMD twisting device, used to apply twisting to the optical fiber 1 through mechanical swing; a diameter gauge 7, arranged below the PMD twisting device, and the diameter gauge 7 is used to measure the diameter of the optical fiber 1; a bias compensation device, arranged below the diameter gauge 7, and the bias compensation device is used to compensate and adjust the twisting of the optical fiber 1 after twisting; a traction mechanism, connected to the bias compensation device, and the traction mechanism is used to pull the optical fiber 1; a control unit, used to obtain the PMD coefficient of the optical fiber 1, and control the PMD twisting device and the bias compensation device according to the PMD coefficient.

[0046] Furthermore, the present invention coordinates the control of the PMD twisting device and the bias compensation device through the control unit. When the PMD test data of the optical fiber 1 is poor, the twisting process of the optical fiber 1 can be adjusted online to make the produced optical fiber 1 have better performance, effectively reducing the transmission performance of the produced optical fiber 1 due to polarization mode dispersion. In addition, the bias compensation device can perform compensation and adjustment at any time according to the PMD test data, greatly improving the adjustment efficiency.

[0047] In an embodiment of the present application, a fiber bias compensation PMD twisting device is provided, and the PMD twisting device includes: an upper positioning wheel 2, which is a V-shaped wheel, and the upper positioning wheel 2 is used to fix the position of the upper part of the optical fiber 1; a twisting wheel 4, which is a V-shaped wheel, arranged below the upper positioning wheel 2, and the twisting wheel 4 is used to adjust the twist angle of the optical fiber 1; a twisting angle adjustment motor 3, which is connected to the twisting wheel 4, and the twisting angle adjustment motor 3 is used to adjust the twisting angle and switching time of the twisting wheel 4; a lower positioning wheel 5, which is a U-shaped wheel, arranged below the twisting wheel 4, and the lower positioning wheel 5 is used to fix the position of the lower part of the optical fiber 1; an alignment adjustment device 6, which is respectively connected to the upper positioning wheel 2 and the lower positioning wheel 5, and the alignment adjustment device 6 is used to adjust the upper positioning wheel 2 and the lower positioning wheel 5.

[0048] Specifically, the upper positioning wheel 2 is a V-shaped wheel, which fixes the position of the optical fiber 1, the twisting angle adjustment motor 3 adjusts the swing angle of the twisting wheel, the twisting wheel 4 is a V-shaped wheel, and the optical fiber 1 can roll clockwise and counterclockwise on the twisting wheel, and the lower positioning wheel 5 is a U-shaped wheel. The rolling optical fiber 1 extends the twisting upward to the molten zone that has not been completely converted into a glass state, that is, the optical fiber 1 twists when it is in a viscous flow state, and the torque is released downward on the U-shaped surface of the lower positioning wheel 5.

[0049] In an embodiment of the present application, a fiber bias compensation PMD twisting device is provided, and the bias compensation device includes: a fixed base 11; a compensation wheel 8, which is a V-shaped wheel, arranged above the fixed base 11, and the compensation wheel 8 is used to compensate for the torsion of the optical fiber 1; a deflection angle adjustment motor 9, which is arranged on the fixed base 11, and the deflection angle adjustment motor 9 is used to electrically adjust and compensate for the torsion angle of the compensation wheel 8; a compensation wheel adjustment device 10, which is connected to the deflection angle adjustment motor 9, and the compensation wheel adjustment device 10 is used to manually adjust and compensate for the torsion angle of the compensation wheel 8.

[0050] Specifically, the compensation wheel 8 is a V-shaped wheel. In a normal state, the compensation wheel 8 is in a vertical 0° state. When torsion compensation is required, the torsion angle compensation is adjusted by the deflection angle adjustment motor 9 and the compensation wheel adjustment device 10 according to the required compensation direction, so that the optical fiber 1 is twisted when passing through the compensation wheel 8. The rolling optical fiber 1 extends the twisting upward to the molten zone that has not been completely converted into a glass state, that is, the optical fiber 1 is twisted when it is in a viscous flow state.

[0051] Furthermore, the twisting wheel 4 is connected to the twisting angle adjustment motor 3, and the vertical position of the optical fiber 1 is kept stable through the upper positioning wheel 2 and the lower positioning wheel 5. The compensation wheel 8 is connected to the compensation wheel adjustment device 10 through the deflection angle adjustment motor 9 and is fixed on the fixed base 11. The optical fiber 1 passes through the upper positioning wheel 2, the twisting wheel 4, the lower positioning wheel 5, the diameter gauge 7, the compensation wheel 8, the tension wheel 12, and the traction machine in sequence.

[0052] Furthermore, the offset angle of the compensation wheel 8 can be compensated and adjusted by the deflection angle adjustment motor 9, or manually adjusted by the compensation adjustment device. Of the two methods, manually adjusting the compensation adjustment device has a more significant effect.

[0053] In an embodiment of the present application, a fiber bias compensation PMD twisting device is provided, and the traction mechanism includes: a tension wheel 12, which is a U-shaped wheel, used to release the torque of the optical fiber 1; a traction machine, connected to the tension wheel 12, and the traction machine is used to pull the optical fiber 1 after the torque is released.

[0054] Furthermore, the optical fiber 1 is twisted when passing through the compensation wheel 8, and the rolling optical fiber 1 extends the twisting upward to the molten zone that has not been completely converted into a glass state, that is, the optical fiber 1 is twisted when it is in a viscous flow state, and the torque is released downward on the U-shaped surface of the lower tension wheel 12, and the optical fiber 1 after the torque is released is pulled by the traction machine.

[0055] In an embodiment of the present application, a fiber bias compensation PMD twisting device is provided, and the diameter of the compensation wheel 8 is larger than that of the twisting wheel 4.

[0056] Specifically, because the diameter of the compensation wheel 8 is much larger than that of the twisting wheel 4, the twisting wheel applies twist to the optical fiber 1 through dynamic swing, while the compensation wheel 8 compensates for the twist of the optical fiber 1 through static angular offset.

[0057] like Figure 2 As shown, in an embodiment of the present application, a fiber bias compensation PMD twisting device is provided, and the control unit includes: an acquisition module, used to acquire the PMD coefficient data of the optical fiber 1, and transmit these data parameters to the processing module; a processing module, electrically connected to the acquisition module, and the processing module is used to set the working state instructions of the PMD twisting device and the bias compensation device according to these data; a control module, electrically connected to the processing module, and the control module is used to control the PMD twisting device and the bias compensation device according to the working state instructions set by the processing module.

[0058] Specifically, the acquisition module is used to acquire the PMD coefficient data of the optical fiber 1 by acquiring the time delay difference between different polarization modes in the optical fiber 1, and transmitting these data parameters to the processing module; the processing module is electrically connected to the acquisition module, and is used to receive and process the PMD coefficient data transmitted by the acquisition module, and the processing module sets the working state instructions of the PMD twisting device and the bias compensation device according to these data; the control module is electrically connected to the processing module, and is used to receive the working state instructions set by the processing module, and control the PMD twisting device and the bias compensation device, and is used to adjust the parameters or states of the PMD twisting device and the bias compensation device according to the instructions of the processing module, so as to realize the control and compensation of PMD, so as to improve the performance and reliability of the optical fiber 1 transmission system. By acquiring accurate PMD coefficient data and setting appropriate working state instructions according to these data, the control module can adjust the PMD twisting device and the bias compensation device in real time to minimize the optical signal distortion and diffusion effect caused by PMD.

[0059] In an embodiment of the present application, a fiber bias compensation PMD twisting device is provided, wherein the processing module is used for: the processing module is specifically used to set a standard PMD coefficient S0, the processing module is also used to obtain a PMD coefficient △S, the processing module is also used to set a first preset coefficient difference S1, a second preset coefficient difference S2, a third preset coefficient difference g3 and a fourth preset coefficient difference S4, and S1<S2<S3<S4; the processing module is also used to set a first preset working parameter matrix A1 (a1, b1), a second preset working parameter matrix A2 (a2, b2), a third preset working parameter matrix A3 (a3, b3) and a fourth preset working parameter matrix A4 (a4, b4), wherein a1-a4 are the first to fourth twisting wheel torsion angles, and a1<a2<a3<a4, b1-b4 are the first to fourth compensation wheel 8 torsion angles, and b1<b2<b3<b4;

[0060] According to the difference between the acquired PMD coefficient △S and the set standard PMD coefficient S0, a preset working parameter matrix Ai is selected as the working parameter of the PMD twisting device and the bias compensation device;

[0061] When △S-S0≤S1, the first preset working parameter matrix A1 is selected as the working parameters of the PMD twisting device and the bias compensation device;

[0062] When S1<△S-S0≤S2, the second preset working parameter matrix A2 is selected as the working parameters of the PMD twisting device and the bias compensation device;

[0063] When S2<△S-S0≤S3, the third preset working parameter matrix A3 is selected as the working parameters of the PMD twisting device and the bias compensation device;

[0064] When S3<ΔS-S0≤S4, the fourth preset working parameter matrix A4 is selected as the working parameters of the PMD twisting device and the bias compensation device.

[0065] Specifically, the PMD coefficient is used to indicate the PMD level in the optical fiber 1, which refers to the ratio of the time delay difference between different polarization modes in the optical fiber 1 to the transmission rate of the optical signal. The larger the PMD coefficient, the more obvious the PMD effect in the optical fiber 1, and the smaller the PMD coefficient, the weaker the PMD effect in the optical fiber 1. Therefore, the working parameters of the PMD twisting device and the bias compensation device are selected according to the difference between the obtained PMD coefficient and the set standard PMD coefficient. Specifically, by adjusting the torsion angle of the twisting wheel in the PMD twisting device and the compensation wheel 8 in the bias compensation device, the PMD coefficient of the produced optical fiber 1 is made close to the standard PMD coefficient, thereby improving the stability of the polarization mode dispersion of the optical fiber 1 during the production process of the optical fiber 1, and effectively reducing the influence of the polarization mode dispersion on the transmission performance during the transmission of the optical fiber 1.

[0066] The working process of the optical fiber bias compensation PMD twisting device is as follows: the optical fiber 1 passes through the upper positioning wheel 2, the twisting wheel 4, the lower positioning wheel 5, the diameter gauge 7, the compensation wheel 8, the tension wheel 12, and the traction machine for traction and winding. The upper positioning wheel 2, the twisting wheel and the lower positioning wheel 5 limit the optical fiber 1 in the vertical direction to keep the position stable. The twisting angle adjustment motor 3 can control the twisting wheel 4 to make the optical fiber 1 roll on the twisting wheel 4 to generate twisting to ensure the stability of the polarization mode dispersion PMD index of the optical fiber 1. When the optical fiber 1 is twisted poorly and the polarization mode dispersion coefficient is too large, the twisting angle of the twisting wheel 4 is adjusted, and the angle of the compensation wheel 8 is compensated by the deflection angle adjustment motor 9 or the compensation adjustment device, so that the optical fiber 1 rolls and twists when passing through the compensation wheel 8, thereby achieving the effect of bias compensation. Because the diameter of the compensation wheel 8 is much larger than the twisting wheel 4, the twisting wheel applies twisting to the optical fiber 1 through dynamic swing, and the compensation wheel 8 compensates for the twisting of the optical fiber 1 through static angle offset.

[0067] In summary, the embodiment of the present invention provides a PMD twisting device for optical fiber bias compensation, which includes: a PMD twisting device for applying twisting to the optical fiber 1 through mechanical swing; a diameter gauge 7, arranged below the PMD twisting device, for measuring the diameter of the optical fiber 1; a bias compensation device, arranged below the diameter gauge 7, for compensating and adjusting the twisting of the optical fiber 1 after twisting; a traction mechanism, connected to the bias compensation device, for traction of the optical fiber 1; a control unit, for obtaining the PMD coefficient of the optical fiber 1, and controlling the PMD twisting device and the bias compensation device according to the PMD coefficient. The present invention coordinates and controls the PMD twisting device and the bias compensation device through the control unit. When the PMD test data of the optical fiber 1 is poor, the twisting process of the optical fiber 1 can be adjusted online, so that the performance of the produced optical fiber 1 is better, and the transmission performance of the produced optical fiber 1 is effectively reduced due to polarization mode dispersion. In addition, the bias compensation device can be used to compensate and adjust at any time according to the PMD test data, which greatly improves the adjustment efficiency.

[0068] Finally, it should be noted that it is obvious that those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

[0069] The above is only an example of implementation of the present invention, but it cannot be used to limit the scope of the present invention. Any structural changes made according to the present invention, as long as they do not lose the essence of the present invention, should be regarded as falling within the scope of protection of the present invention and being restricted. Those skilled in the art can clearly understand that for the convenience and simplicity of description, the specific working process and related instructions of the system described above can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here.

[0070] The term "comprise" or any other similar term is intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus / device that includes a list of elements includes not only those elements but also other elements not expressly listed, or also includes elements inherent to such process, method, article, or apparatus / device.

[0071] So far, the technical solutions of the present invention have been described in conjunction with the further embodiments shown in the accompanying drawings, but it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

[0072] The above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention.

Claims

1. A fiber bias compensation PMD twisting device, characterized in that: include: PMD twisting device, used to apply twist to the optical fiber through mechanical swing; A diameter gauge is arranged below the PMD twisting device, and is used to measure the diameter of the optical fiber; A bias compensation device is arranged below the caliper, and is used to compensate and adjust the twist of the twisted optical fiber; A traction mechanism connected to the bias compensation device, the traction mechanism being used to traction the optical fiber; A control unit, used for obtaining the PMD coefficient of the optical fiber, and controlling the PMD twisting device and the bias compensation device according to the PMD coefficient; The bias compensation device comprises: Fixed base; A compensation wheel, which is a V-shaped wheel, is arranged above the fixed base, and is used to compensate and adjust the torsion of the optical fiber; A deflection angle adjustment motor is arranged on the fixed base, and the deflection angle adjustment motor is used to electrically adjust and compensate for the torsion angle of the compensation wheel; A compensation wheel adjustment device, connected to the deflection angle adjustment motor, the compensation wheel adjustment device is used to manually adjust and compensate for the torsion angle of the compensation wheel; The control unit comprises: An acquisition module is used to acquire the PMD coefficient data of the optical fiber and transmit these data parameters to the processing module; A processing module, electrically connected to the acquisition module, and configured to set working state instructions of the PMD twisting device and the bias compensation device according to the data; A control module, electrically connected to the processing module, and used for controlling the PMD twisting device and the bias compensation device according to the working state instruction set by the processing module; The processing module is used for: The processing module is specifically used to set the standard PMD coefficient S0, and the processing module is also used to obtain the PMD coefficient △S. The processing module is also used to set the first preset coefficient difference S1, the second preset coefficient difference S2, the third preset coefficient difference S3 and the fourth preset coefficient difference S4, and S1<S2<S3<S4; the processing module is also used to set the first preset working parameter matrix A1 (a1, b1), the second preset working parameter matrix A2 (a2, b2), the third preset working parameter matrix A3 (a3, b3) and the fourth preset working parameter matrix A4 (a4, b4), wherein a1-a4 are the first to fourth rubbing wheel torsion angles, and a1<a2<a3<a4, b1-b4 are the first to fourth compensation wheel torsion angles, and b1<b2<b3<b4; According to the difference between the acquired PMD coefficient △S and the set standard PMD coefficient S0, a preset working parameter matrix Ai is selected as the working parameter of the PMD twisting device and the bias compensation device; When △S-S0≤S1, the first preset working parameter matrix A1 is selected as the working parameters of the PMD twisting device and the bias compensation device; When S1<△S-S0≤S2, the second preset working parameter matrix A2 is selected as the working parameters of the PMD twisting device and the bias compensation device; When S2<△S-S0≤S3, the third preset working parameter matrix A3 is selected as the working parameters of the PMD twisting device and the bias compensation device; When S3<ΔS-S0≤S4, the fourth preset working parameter matrix A4 is selected as the working parameters of the PMD twisting device and the bias compensation device.

2. The optical fiber bias compensation PMD twisting device according to claim 1, characterized in that: The PMD twisting device comprises: The upper positioning wheel is a V-shaped wheel, and the upper positioning wheel is used to fix the position of the upper part of the optical fiber; The twisting wheel is a V-shaped wheel, which is arranged below the upper positioning wheel and is used to adjust the twisting angle of the optical fiber; A twisting angle adjustment motor is connected to the twisting wheel, and the twisting angle adjustment motor is used to adjust the torsion angle and the switching time of the twisting wheel; The lower positioning wheel is a U-shaped wheel, which is arranged below the twisting wheel and is used to fix the position of the lower part of the optical fiber; The collimation adjustment device is connected to the upper positioning wheel and the lower positioning wheel respectively, and the collimation adjustment device is used to adjust the upper positioning wheel and the lower positioning wheel.

3. The optical fiber bias compensation PMD twisting device according to claim 1, characterized in that: The traction mechanism comprises: The tension wheel is a U-shaped wheel used to release the torque of the optical fiber; A traction machine is connected to the tension wheel, and is used for traction of the optical fiber after the torque is released.

4. The optical fiber bias compensation PMD twisting device according to claim 1, characterized in that: The diameter of the compensation wheel is larger than the twisting wheel.

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