High-precision adjustable optical fiber phase shifter and phase shift adjustment method thereof
By using a phase shift adjustment mechanism and an oil injection and pressurization mechanism in the optical fiber phase shifter, the problem of limited motor control accuracy is solved, high-precision optical fiber phase shift control is realized, and the accuracy of the optical fiber phase shifter is enhanced.
Patent Information
- Application Number
- CN202411704473.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-26
- Publication Date
- 2025-01-14
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
The existing fiber phase shifter controls the optical path change by moving the pyramid cone by the motor, resulting in limited phase shift accuracy and inability to achieve extremely high accuracy.
A high-precision adjustable fiber phase shifter is designed, using a phase shift adjustment mechanism. By combining the threaded fit of the drive screw and the slide, the oil injection and pressurization mechanism can achieve high-precision movement and lubrication of the phase shift crystal to ensure the optical fiber. phase control accuracy.
Through this method, the phase shift accuracy is significantly improved, high-precision phase control is achieved, and the accuracy of the optical fiber phase shifter is enhanced, and the motion accuracy problems caused by incomplete engagement or local loose engagement is avoided.
Smart Images
Figure CN119310776A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of optical fiber phase shifters, and more specifically, to a high-precision adjustable optical fiber phase shifter and a phase shift adjustment method thereof. Background Art
[0002] A fiber phase shifter is a device used to adjust the phase of an optical signal, and is commonly used in fields such as fiber-optic communications and microwave photonics. It achieves phase changes by controlling the propagation path of light in an optical fiber or by adjusting the phase of a light wave, thereby affecting the interference and coherence characteristics of the signal. In the context of high-precision adjustable fiber delay lines, fiber phase shifters usually have the advantages of miniaturization, low loss, high precision, and strong anti-interference capabilities, and are suitable for a variety of application scenarios such as phased array radars, satellites, and wireless broadband communications.
[0003] Existing optical fibers often use a motor to move the cone angle to control the optical path change, thereby achieving phase shift control. In order to take into account the phase shift range, although moving the cone angle by a motor is a feasible method and can adjust the phase within a certain range, its accuracy is limited by the control accuracy of the motor. If the motor cannot achieve extremely high precision control, the final phase shift accuracy cannot reach a very high level. Therefore, the method of controlling the cone angle by a motor often makes the phase shift accuracy affected by the motor control accuracy and cannot be further improved. Summary of the invention
[0004] The present invention provides a high-precision adjustable fiber phase shifter and a phase shift adjustment method thereof, and aims to solve the problem that the existing fiber phase shifter often uses a motor to move an angle cone to control the optical path change, thereby achieving phase shift control. In order to take into account the phase shift range, the motor control angle cone method often makes the phase shift accuracy affected by the motor control accuracy and cannot be further improved.
[0005] To achieve the above object, the present invention provides the following technical solution: a high-precision adjustable fiber phase shifter, comprising: a housing, a fiber collimator, two phase shift crystals and a reflector, wherein the fiber collimator, the two phase shift crystals and the reflector are aligned in the horizontal direction, the fiber collimator is installed on one side of the housing, and the output end of the fiber collimator extends into the housing, the two phase shift crystals and the reflector are both installed in the housing, the optical fiber is incident through the input end of the fiber collimator, and is emitted from the output end of the fiber collimator, and is directly emitted to the reflector through the two phase shift crystals, and then reflected by the reflector;
[0006] The shell is provided with a phase shift adjustment mechanism, which includes a driving member, and the driving member is used for driving one of the phase shift crystals to move so as to stagger the two phase shift crystals.
[0007] In a preferred embodiment, a lead screw is installed at the output end of the driving member, a sliding seat is slidably arranged in the housing, one phase shift crystal is fixedly mounted on the sliding seat, and the lead screw is threadedly connected to the sliding seat.
[0008] In a preferred embodiment, the phase shift adjustment mechanism further includes a controller, and the controller is used to control the driving member to drive the lead screw to move, and control the movement amount of the feedback lead screw.
[0009] In a preferred embodiment, an oil injection mechanism is provided on the slide seat, and the oil injection mechanism includes a plurality of oil injection holes opened on the slide seat, and blocking shafts are slidably arranged in the plurality of oil injection holes. An internal threaded hole is opened on the slide seat, and the slide seat is connected to the screw thread through the internal threaded hole. The plurality of oil injection holes are connected to the internal threaded hole, and the ends of the plurality of blocking shafts are in contact with the inner wall of the internal threaded hole.
[0010] In a preferred embodiment, the oil filling mechanism also includes an oil storage member, which is installed on one side of the slide seat. A connecting hole is also opened in the slide seat, which is connected to the multiple oil filling holes, and the oil outlet end of the oil storage member is connected to the connecting hole.
[0011] In a preferred embodiment, the oil injection mechanism further includes a power component, which is mounted on one side of the slide seat, and a movable plate is mounted on the output end of the power component, and the plurality of blocking shafts are fixedly mounted on the movable plate.
[0012] In a preferred embodiment, a pressurizing mechanism is further provided on the slide seat, and the pressurizing mechanism includes a squeeze plate that can slide linearly, and the pressurizing mechanism squeezes the oil storage member through the squeeze plate to pressurize the flow of the lubricating oil.
[0013] In a preferred embodiment, the sides of the extrusion plate and the movable plate are both beveled, and the bevels of the extrusion plate are in sliding contact with the bevels of the movable plate. The pressurizing mechanism drives the extrusion plate to move toward the oil storage member through the movement of the movable plate.
[0014] In a preferred embodiment, the pressurizing mechanism further comprises a fixing plate, the fixing plate is fixedly arranged on one side of the slide seat, and the pressing plate is slidably arranged on the fixing plate, and an elastic member is arranged between the pressing plate and the fixing plate.
[0015] A phase shift adjustment method for a high-precision adjustable optical fiber phase shifter comprises the following steps:
[0016] Step 1: Check the status of each component to ensure it works normally;
[0017] Step 2: The phase shift adjustment mechanism drives one of the phase shift crystals to move, staggering the two phase shift crystals to achieve phase shift adjustment;
[0018] Step 3: During the process of step 2, the controller controls the driving member to drive the lead screw to move, so as to drive the phase shift crystal to move, and controls the movement amount of the feedback lead screw to achieve high-precision phase control;
[0019] Step 4: The optical fiber is input through the input end of the optical fiber collimator, then output from the output end of the optical fiber collimator, and directly directed to the reflector through two phase shift crystals, and then reflected by the reflector.
[0020] The beneficial effects of the present invention are:
[0021] The present invention can improve the existing accuracy by arranging a phase shift adjustment mechanism and adjusting the phase shift crystal, thereby realizing high-precision phase control.
[0022] The present invention provides an oil filling mechanism and a slidable blocking shaft in the oil filling hole. After the oil filling is completed, the oil filling hole is blocked by the blocking shaft so that the end of the blocking shaft fits with the inner wall of the internal threaded hole, thereby avoiding the problem of incomplete engagement or partial loose engagement between the screw rod and the internal thread due to the opening of the oil filling hole in the internal threaded hole, thereby affecting the movement accuracy. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.
[0024] Figure 2 The cross-sectional structure diagram of the present invention is shown in FIG. Figure 1 .
[0025] Figure 3 It is a schematic cross-sectional structure diagram of the main view of the present invention.
[0026] Figure 4 It is a schematic diagram of the phase shift adjustment principle of the present invention.
[0027] Figure 5 The cross-sectional structure diagram of the present invention is shown in FIG. Figure 2 .
[0028] Figure 6 for Figure 5 A magnified view of the structure in the middle.
[0029] Figure 7 for Figure 6 Schematic diagram of the motion state of the middle part of the structure.
[0030] Figure 8 The figure is a flow chart of the method of the present invention.
[0031] The accompanying drawings are marked as follows: 1. housing; 2. optical fiber collimator; 3. phase shift crystal; 4. reflector; 5. phase shift adjustment mechanism; 51. controller; 52. driving member; 53. screw rod; 54. slide seat; 541. internal threaded hole; 6. fixed seat; 7. oil filling mechanism; 71. power component; 72. moving plate; 73. blocking shaft; 74. oil filling hole; 75. connecting hole; 76. oil storage member; 8. pressurizing mechanism; 81. extrusion plate; 82. fixing plate; 83. elastic member. DETAILED DESCRIPTION
[0032] The present application is further described in detail below in conjunction with the accompanying drawings. It is necessary to point out here that the following specific implementation methods are only used to further illustrate the present application and cannot be understood as limiting the scope of protection of the present application. Technical personnel in this field can make some non-essential improvements and adjustments to the present application based on the above application content.
[0033] Refer to the instruction manual Figures 1 to 4 A high-precision adjustable fiber phase shifter comprises: a housing 1, a fiber collimator 2, two phase shift crystals 3 and a reflector 4, wherein the fiber collimator 2, the two phase shift crystals 3 and the reflector 4 are aligned in the horizontal direction, the fiber collimator 2 is mounted on one side of the housing 1, and the output end of the fiber collimator 2 extends into the housing 1, the two phase shift crystals 3 and the reflector 4 are both mounted in the housing 1, the optical fiber is incident through the input end of the fiber collimator 2, and is emitted from the output end of the fiber collimator 2, and is directly emitted to the reflector 4 through the two phase shift crystals 3, and then reflected by the reflector 4;
[0034] The housing 1 is provided with a phase shift adjustment mechanism 5, which includes a driving member 52, and the driving member 52 is used to drive one of the phase shift crystals 3 to move so as to stagger the two phase shift crystals 3;
[0035] A lead screw 53 is installed at the output end of the driving member 52, and a slide seat 54 is slidably arranged in the housing 1, wherein one phase shift crystal 3 is fixedly mounted on the slide seat 54, and the lead screw 53 is threadedly connected to the slide seat 54;
[0036] The phase shift adjustment mechanism 5 further includes a controller 51 , which is used to control the driving member 52 to drive the lead screw 53 to move, and to control the movement amount of the feedback lead screw 53 .
[0037] It should be noted that the controller 51 is a single chip microcomputer, the driving component 52 is a motor, one phase shift crystal 3 is fixedly mounted on the slide 54, and the other phase shift crystal 3 is set as a fixed rod. A fixed seat 6 is fixedly mounted in the housing 1, and the other phase shift crystal 3 is fixedly mounted on the fixed seat 6.
[0038] The specific implementation scenario is as follows: the controller 51 controls the driving motor so that the motor drives the lead screw 53 to rotate, and the slide 54 is connected to the lead screw 53 through the threaded cooperation of the slide 54, so that the slide 54 can drive the phase shift crystal 3 fixedly installed on the slide 54 to move and adjust the position, so that the two phase shift crystals 3 can be staggered, and then when the optical fiber is input from the input end of the optical fiber collimator 2, output from the output end of the optical fiber collimator 2, and shot on the phase shift crystal 3, the position of the first phase shift crystal 3 can be adjusted, and then when the optical fiber is shot out from the first phase shift crystal 3, the position of the first phase shift crystal 3 can be adjusted, so that the position of the shot from the second phase shift crystal 3 can be adjusted, and then the position of the shot to the reflector 4 can be adjusted to achieve the adjustment effect. In addition, the controller 51 can control the driving motor, and when the motor drives the lead screw 53 to rotate, it can control the number of moving threads of the lead screw 53, thereby achieving the effect of high-precision phase shift adjustment.
[0039] It should also be noted that the specific working principle is as follows Figure 4 As shown, Figure 4 Where a is the original optical path, and b is the optical path after the phase shift crystal 3 moves upward. Here we assume that the refractive index of air is 1, the refractive index of the phase shift crystal 3 is n, and the motor control accuracy is δL; then according to the refraction principle, the optical path difference accuracy formula of b relative to the original optical path is:
[0040]
[0041] Assuming that the phase shift crystal 3 is a quartz substrate with a refractive index of about 1.5 and the crystal angle θ is 82 degrees, the optical path difference accuracy of 9-1 relative to the original optical path is about 0.14δL, which is 7.1 times higher. If the crystal angle θ is 89 degrees, the optical path difference accuracy of b relative to the original optical path is about 0.0182δL, which is 54.8 times higher.
[0042] In the above technical solution, the phase shift crystal 3 is driven to move by the screw rod 53 and the slide seat 54 through the thread, which can effectively improve its movement accuracy. Since the accuracy requirement is high, in order to reduce the friction between the screw rod 53 and the slide seat 54 and make the relative movement between the two smoother, and at the same time, in order to reduce the wear between the screw rod 53 and the slide seat 54, the screw rod 53 needs to be lubricated frequently to ensure its accuracy. At present, lubrication is usually carried out by directly applying lubricating oil to the screw rod 53. Therefore, it is necessary to drive the slide seat 54 to move on the screw rod 53 by driving the screw rod 53, so that the screw rod 53 leaks out in sections to realize the lubrication operation of the screw rod 53. However, since the phase shift crystal 3 is arranged in the housing 1, the movement space of the phase shift crystal 3 is limited, and when the screw rod 53 and the slide seat 54 are connected by threaded cooperation, the actual contact surface is the contact area between the threads. The larger the contact area, the smaller the contact area. The larger the total contact surface, the wider the range of action of the unit force, which helps to reduce the gap effect caused by the thread gap and error, reduce the deviation in the movement, and thus improve the accuracy. Therefore, in order to ensure its movement accuracy, it is necessary to make the contact area between the slide 54 and the screw 53 as large as possible, so that the screw 53 cannot be leaked out in sections to achieve lubrication operation. Therefore, in the prior art, the screw 53 can be lubricated by opening an oil hole on the slide 54. By opening the oil hole, the oil hole needs to be connected to the threaded hole opened on the slide 54. However, since the threaded meshing area usually requires precise matching to ensure smooth and accurate movement between the screw 53 and the slide 54, the oil hole opened in the threaded hole will affect the geometry of the thread, resulting in incomplete meshing or partial loose meshing, thereby affecting the movement accuracy. For this reason, the present invention proposes an oil injection mechanism 7 to solve the above-mentioned problem.
[0043] For details, please refer to the attached manual. Figure 5 and Figure 6 An oil injection mechanism 7 is provided on the slide 54, and the oil injection mechanism 7 includes a plurality of oil injection holes 74 provided on the slide 54, and blocking shafts 73 are slidably provided in the plurality of oil injection holes 74. An internal threaded hole 541 is provided on the slide 54, and the slide 54 is threadedly connected to the screw rod 53 through the internal threaded hole 541. The plurality of oil injection holes 74 are communicated with the internal threaded hole 541, and the ends of the plurality of blocking shafts 73 are in contact with the inner wall of the internal threaded hole 541.
[0044] It should be noted that when the slide 54 is driven to move by the screw rod 53, the blocking shaft 73 can fit with the inner wall of the internal threaded hole 541, so that the problem of incomplete engagement or partial loose engagement caused by the oil filling hole 74 connected to the internal threaded hole 541 can be solved, and its movement accuracy can still be guaranteed. When oil filling is needed, the blocking shaft 73 can be slid out of the corresponding oil filling hole 74, and then oil lubrication can be carried out from the oil filling hole 74 to the screw rod 53.
[0045] For further information, please refer to the attached manual. Figure 5 and Figure 6 The oil filling mechanism 7 also includes an oil storage member 76, which is installed on one side of the slide seat 54. A connecting hole 75 is also opened in the slide seat 54, and the connecting hole 75 is connected to the multiple oil filling holes 74. The oil outlet end of the oil storage member 76 is connected to the connecting hole 75.
[0046] It should be noted that since the oil outlet end of the oil storage piece 76 is connected to the connecting hole 75, after the blocking shaft 73 is pulled out, oil can be injected into the connecting hole 75 through the oil storage piece 76, and the lubricating oil can enter the corresponding oil injection hole 74 through the connecting hole 75, and then be injected into the screw rod 53 for lubrication through the corresponding oil injection hole 74.
[0047] For further information, please refer to the attached manual. Figure 5 and Figure 6 The oil injection mechanism 7 also includes a power component 71 , which is installed on one side of the slide seat 54 . A moving plate 72 is installed at the output end of the power component 71 , and a plurality of blocking shafts 73 are fixedly installed on the moving plate 72 .
[0048] It should be noted that the power component 71 can be a cylinder, which drives the moving plate 72 to drive the multiple blocking shafts 73 to move, and the cylinder can be controlled and driven by the controller 51, so that it can ensure the precise movement of the blocking shafts 73, and avoid the problem of scratches and wear between the screw rod 53 and the blocking shaft 73 when the slide seat 54 is driven to move by the screw rod 53 due to inaccurate moving position of the blocking shaft 73, thereby affecting the movement accuracy.
[0049] In the above technical scheme, an oil filling hole 74 is opened on the slide 54 to fill oil into the screw rod 53 for lubrication. However, since high precision needs to be ensured when the slide 54 is driven to move by the screw rod 53, the screw rod 53 needs to be in direct contact with the internal threaded hole 541 opened on the slide 54 with relative precision. Therefore, when filling the oil, it is easy for the lubricating oil to have difficulty entering the internal threaded hole 541 to lubricate the screw rod 53. For this reason, the present invention further proposes a pressurizing mechanism 8, which pressurizes the flow of the lubricating oil when injecting the lubricating oil so as to squeeze the lubricating oil from the oil filling hole 74 into the internal threaded hole 541, thereby achieving the effect of lubricating the screw rod 53.
[0050] For details, please refer to the attached manual. Figure 7 A pressurizing mechanism 8 is also provided on the slide seat 54. The pressurizing mechanism 8 includes a squeeze plate 81 that can slide linearly. The pressurizing mechanism 8 squeezes the oil storage member 76 through the squeeze plate 81 to pressurize the flow of the lubricating oil.
[0051] It should be noted that the oil storage member 76 can be made of a material similar to an airbag. When injecting lubricating oil, the oil storage member 76 can be squeezed through the linear motion of the extrusion plate 81, so that the flow of the lubricating oil is pressurized during oil injection, ensuring that the lubricating oil can smoothly enter between the screw rod 53 and the internal threaded hole 541.
[0052] For further information, please refer to the attached manual. Figure 7 The sides of the extrusion plate 81 and the movable plate 72 are both set as beveled edges, and the beveled edges of the extrusion plate 81 are in sliding contact with the beveled edges of the movable plate 72. The pressurizing mechanism 8 drives the extrusion plate 81 to move toward the direction close to the oil storage member 76 through the movement of the movable plate 72.
[0053] It should be noted that when the movable plate 72 moves, the oblique edge of the extrusion plate 81 can slide in contact with the oblique edge of the movable plate 72, so that the movable plate 72 drives the extrusion plate 81 to move toward the direction close to the oil storage part 76, so that it can squeeze the oil storage part 76 and achieve the effect of pressurizing the flow of the lubricating oil.
[0054] For further information, please refer to the attached manual. Figure 7 The pressurizing mechanism 8 further includes a fixing plate 82 , which is fixedly disposed on one side of the slide seat 54 , and the pressing plate 81 is slidably disposed on the fixing plate 82 , and an elastic member 83 is disposed between the pressing plate 81 and the fixing plate 82 .
[0055] It should be noted that the elastic member 83 is a spring. During the movement of the extrusion plate 81 toward the oil storage member 76, the extrusion plate 81 can squeeze the spring. After the oil injection is completed, the elastic deformation of the spring can be used to reset the extrusion plate 81 for the next oil injection.
[0056] Refer to the instruction manual Figure 8 , a phase shift adjustment method for a high-precision adjustable optical fiber phase shifter, comprising the following steps:
[0057] Step 1: Check the status of each component to ensure it works normally;
[0058] Step 2: The phase shift adjustment mechanism 5 drives one of the phase shift crystals 3 to move, staggering the two phase shift crystals 3 to achieve phase shift adjustment;
[0059] Step 3: During step 2, the controller 51 controls the driving member 52 to drive the lead screw 53 to move, so as to control the movement amount of the feedback lead screw 53 when driving the phase shift crystal 3 to move, thereby achieving high-precision phase control;
[0060] Step 4: The optical fiber is input through the input end of the optical fiber collimator 2 , and then output from the output end of the optical fiber collimator 2 , and passes through two phase shift crystals 3 directly toward the reflector 4 , and then reflected by the reflector 4 .
[0061] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.
Claims
1. A high-precision adjustable optical fiber phase shifter, characterized in that: include: A housing (1), a fiber collimator (2), two phase shift crystals (3) and a reflector (4), wherein the fiber collimator (2), the two phase shift crystals (3) and the reflector (4) are aligned in a horizontal direction, the fiber collimator (2) is mounted on one side of the housing (1), and the output end of the fiber collimator (2) extends into the housing (1), the two phase shift crystals (3) and the reflector (4) are both mounted in the housing (1), the optical fiber is incident through the input end of the fiber collimator (2), and is emitted from the output end of the fiber collimator (2), and is directly emitted to the reflector (4) through the two phase shift crystals (3), and is then reflected by the reflector (4); The housing (1) is provided with a phase shift adjustment mechanism (5), the phase shift adjustment mechanism (5) comprising a driving member (52), the driving member (52) being used to drive one of the phase shift crystals (3) to move so as to stagger the two phase shift crystals (3).
2. A high-precision adjustable fiber phase shifter according to claim 1, characterized in that: A lead screw (53) is installed at the output end of the driving member (52), a sliding seat (54) is slidably arranged in the housing (1), a phase shift crystal (3) is fixedly installed on the sliding seat (54), and the lead screw (53) is threadedly connected to the sliding seat (54).
3. The high-precision adjustable fiber phase shifter according to claim 2, characterized in that: The phase shift adjustment mechanism (5) further comprises a controller (51), wherein the controller (51) is used to control the driving member (52) to drive the screw rod (53) to move, and to control the movement amount of the feedback screw rod (53).
4. The high-precision adjustable optical fiber phase shifter according to claim 3, characterized in that: The slide seat (54) is provided with an oil injection mechanism (7), the oil injection mechanism (7) comprising a plurality of oil injection holes (74) provided on the slide seat (54), a blocking shaft (73) being slidably provided in each of the plurality of oil injection holes (74), an internal threaded hole (541) provided on the slide seat (54), the slide seat (54) being threadedly connected to the screw rod (53) via the internal threaded hole (541), the plurality of oil injection holes (74) being connected to the internal threaded hole (541), and the ends of the plurality of blocking shafts (73) being in contact with the inner wall of the internal threaded hole (541).
5. The high-precision adjustable optical fiber phase shifter according to claim 4, characterized in that: The oil injection mechanism (7) further comprises an oil storage member (76), the oil storage member (76) being mounted on one side of the slide seat (54), a connecting hole (75) being provided in the slide seat (54), the connecting hole (75) being connected to the plurality of oil injection holes (74), and an oil outlet end of the oil storage member (76) being connected to the connecting hole (75).
6. The high-precision adjustable fiber phase shifter according to claim 5, characterized in that: The oil injection mechanism (7) further comprises a power component (71), the power component (71) being mounted on one side of the slide seat (54), a movable plate (72) being mounted on the output end of the power component (71), and a plurality of blocking shafts (73) being fixedly mounted on the movable plate (72).
7. The high-precision adjustable fiber phase shifter according to claim 6, characterized in that: The slide seat (54) is also provided with a pressurizing mechanism (8), the pressurizing mechanism (8) comprising a linearly slidable extrusion plate (81), and the pressurizing mechanism (8) presses the oil storage member (76) through the extrusion plate (81) to pressurize the flow of lubricating oil.
8. The high-precision adjustable optical fiber phase shifter according to claim 7, characterized in that: The side edges of the extrusion plate (81) and the movable plate (72) are both arranged as beveled edges, and the beveled edge of the extrusion plate (81) is in sliding contact with the beveled edge of the movable plate (72). The pressurizing mechanism (8) drives the extrusion plate (81) to move in a direction close to the oil storage member (76) through the movement of the movable plate (72).
9. The high-precision adjustable fiber phase shifter according to claim 8, characterized in that: The pressurizing mechanism (8) further comprises a fixing plate (82), wherein the fixing plate (82) is fixedly arranged on one side of the slide seat (54), and the extrusion plate (81) is slidably arranged on the fixing plate (82), and an elastic member (83) is arranged between the extrusion plate (81) and the fixing plate (82).
10. A phase shift adjustment method for a high-precision adjustable optical fiber phase shifter as claimed in claim 3, characterized in that: The following steps are involved: Step 1: Check the status of each component to ensure it works normally; Step 2: The phase shift adjustment mechanism (5) drives one of the phase shift crystals (3) to move, staggering the two phase shift crystals (3) to achieve phase shift adjustment; Step 3: During the process of step 2, the controller (51) controls the driving member (52) to drive the lead screw (53) to move, so as to drive the phase shift crystal (3) to move, and controls the movement amount of the feedback lead screw (53) to achieve high-precision phase control; Step 4: The optical fiber is input through the input end of the optical fiber collimator (2), then output from the output end of the optical fiber collimator (2), and directly emitted to the reflector (4) through two phase shift crystals (3), and then reflected by the reflector (4).