Cylindrically oriented coated optical fiber preform, methods of making and using same

Abstract

The application discloses a cylindrical directional coating optical fiber preform, a preparation method and a use method thereof. The cylindrical directional coating optical fiber preform comprises a packaging piece and a coated optical fiber. The packaging piece has a rectangular frame and a pressing strip. A pair of side edges of the rectangular frame has a packaging groove. The pressing strip is detachably matched with the packaging groove. A direction perpendicular to a plane where the packaging piece is located is a light transmission direction. Two ends of the coated optical fiber are respectively fixed in the packaging grooves on two sides of the packaging piece. The preparation method comprises the steps of clamping and coating. The use method is as follows: the cylindrical directional coating optical fiber preform is fixed in a preset direction, so that the light transmission direction of the cylindrical coated optical fiber is consistent with the light transmission direction of an optical path; and then the coated optical fiber is separated from the cylindrical directional coating optical fiber preform. The application realizes coating only in the light transmission direction of the optical fiber, thereby solving the technical problems of high raw material cost and manufacturing cost, complex process, low production efficiency and poor product consistency of the existing cylindrical coated optical fiber.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of optical fiber coating, and more particularly relates to a cylindrical directional coating optical fiber preform, a preparation method and a use method thereof. BACKGROUND

[0002] With the continuous development of optical fiber technology, optical fibers have been widely used in communication, laser, lighting, medical treatment, sensors and other fields. In some cases, in order to improve the transmission efficiency of light in the optical fiber, a layer of anti-reflection film is needed to be coated on the end of the optical fiber to reduce the Fresnel back reflection. In some other fields, it is also necessary to coat the cylindrical surface of the optical fiber to reduce the influence of the cylindrical Fresnel reflection on the beam shaping and coupling efficiency.

[0003] At present, more research is on the coating of the end surface of the optical fiber, and the coating of the cylindrical surface of the optical fiber is difficult and has less research reports. At present, the optical fiber cylindrical surface coating technology strives to uniformly coat the optical fiber circumferentially, as shown in the accompanying drawings. Figure 4 In order to realize the uniform circumferential coating of the optical fiber, the optical fiber needs to be rotated in the coating environment. Since the optical fiber is relatively soft, the bending or twisting of the optical fiber in the coating process will cause internal stress of the optical fiber, which seriously affects the coating effect of the cylindrical surface. Improving the circumferential coating uniformity of the cylindrical surface coating has been the main technical route all the time. For example, patent CN106319472A discloses a rotation coating fixture which rotates in both directions. The fixture structure is complex, and the internal structure of the coating machine and the umbrella need to be modified to improve the uniformity of the coating. However, in order to achieve the uniform thickness of the circumferential coating of the optical fiber, the cylindrical surface coating technology of the optical fiber has high manufacturing cost and low efficiency; during the rotation process, the film layer, the optical fibers clamped at different positions of the same fixture cannot guarantee the consistency of the coating. In addition, patent CN102071404A discloses a cylindrical surface coating rotation device. Each self-rotating part is connected with one end of an optical fiber. Since the optical fiber is relatively thin, long and soft, the optical fiber is prone to shaking during the coating rotation process, which affects the uniformity of the film layer. Moreover, only 4-10 optical fibers can be loaded at a time, which is low in efficiency and not suitable for mass industrial production. SUMMARY

[0004] In view of the above defects or improvement needs of the prior art, the present application provides a cylindrical directional coating optical fiber preform, a preparation method and a use method thereof. The purpose is to clamp the optical fiber by the rectangular frame and the pressing strip, to realize the coating only in the light transmission direction of the cylindrical surface of the optical fiber, and to ensure that the light transmission direction of the coated optical fiber is accurately in the optical path when the preform is used to manufacture an optical device, thereby solving the technical problems of high raw material cost and manufacturing cost, complex process, low production efficiency and poor product consistency of the existing cylindrical surface coated optical fiber.

[0005] To achieve the above object, according to one aspect of the present application, a cylindrical directional coating optical fiber preform is provided, comprising a packaging member and a coating optical fiber;

[0006] The packaging member has a rectangular frame and a pressing strip; a pair of side edges of the rectangular frame has a packaging groove; the pressing strip is detachably matched with the packaging groove;

[0007] The direction perpendicular to the plane where the packaging member is located is the light transmission direction;

[0008] The two ends of the coating optical fiber are respectively fixed in the packaging grooves on the two sides of the packaging member; the coating optical fiber has a preset thickness of coating in the light transmission direction of the cross section of the coating optical fiber; the coating thickness in the non-light transmission direction of the cross section of the coating optical fiber is less than the coating thickness in the light transmission direction.

[0009] Preferably, the cylindrical directional coating optical fiber preform has a plurality of coating optical fibers which are arranged in parallel to the other pair of side edges of the rectangular frame at a preset interval or position. The interval is preferably greater than or equal to 0.5 mm and less than or equal to 2 mm.

[0010] Preferably, the cylindrical directional coating optical fiber preform has the rectangular frame packaging groove filled with glue, so that the coating optical fiber is fixed without rotation. Compared with the traditional mechanical hard contact fixing mode, the glue fixing belongs to soft contact fixing, which can effectively fix and is not easy to damage the optical fiber. The glue is optical glue which will not contaminate the surface of the optical fiber due to high temperature and other factors in the vacuum coating environment, affecting the quality of the coating layer; the glue can be easily peeled off, so that the rectangular frame can be repeatedly used; preferably, UV curing glue or heat curing glue is used. The length range of the rectangular frame is preferably 30-200 mm, and the width range is preferably 30-200 mm, so that the optical fiber is not easy to shake by being fixed at both ends.

[0011] Preferably, the cylindrical directional coating optical fiber preform has a groove edge of the packaging groove with a wire groove, and the two ends of the coating optical fiber are clamped in the wire groove.

[0012] Preferably, the cylindrical directional coating optical fiber preform has a square, V-shaped, U-shaped or O-shaped wire groove.

[0013] Preferably, the cylindrical directional coating optical fiber preform has one end or one side of the pressing strip matched with the packaging groove through a hinge and / or the pressing strip matched with the packaging groove through magnetic attraction.

[0014] According to another aspect of the present application, a preparation method of the cylindrical directional coating optical fiber preform is provided, comprising the following steps:

[0015] Clamping: the two ends of the bare optical fiber are respectively fixed without rotation in the packaging grooves on the two sides of the packaging member to obtain a to-be-coated member;

[0016] coating: placing the to-be-coated piece on a coating umbrella frame, static coating on both sides to obtain the cylindrical directional coating optical fiber preform.

[0017] Preferably, the preparation method of the cylindrical directional coating optical fiber preform comprises the following sub-steps in the clamping step:

[0018] placing the optical fiber in the line groove of the packaging groove at a preset interval or position;

[0019] dispensing: uniformly dispensing in the packaging groove; the dispensing preferably uses UV curing glue or heat curing glue;

[0020] fixing: curing the glue in the packaging groove where the optical fiber is placed, fixing the optical fiber and the packaging groove so that there is no relative rotation between them;

[0021] packaging: assembling the pressing strip on the packaging groove.

[0022] Preferably, the preparation method of the cylindrical directional coating optical fiber preform uses vacuum evaporation coating or sputtering coating in the coating step.

[0023] According to another aspect of the present application, a use method of the cylindrical directional coating optical fiber preform is provided, comprising the following steps:

[0024] fixing the cylindrical directional coating optical fiber preform in a preset direction so that the light transmission direction of the cylindrical coating optical fiber is consistent with the light transmission direction of the optical path; and then separating the coating optical fiber from the cylindrical directional coating optical fiber preform.

[0025] Overall, compared with the prior art, the above technical solutions conceived by the present application can achieve the following beneficial effects:

[0026] The cylindrical directional coating optical fiber preform, its preparation and use method provided by the present application fix the optical fiber by clamping, only coat a preset thickness in the light transmission direction, and do not need to uniformly and fully coat the circumference in the cylindrical direction of the optical fiber, thereby reducing the coating material cost by nearly 50%.

[0027] Meanwhile, the preparation method of the cylindrical directional coating optical fiber preform provided by the present application does not need to rotate the optical fiber or the optical fiber clamping piece, uses static coating, is suitable for the existing coating umbrella frame without modification, has high production efficiency, firmly clamps the optical fiber, is convenient to operate, and is suitable for the cylindrical coating device and method for mass industrial production.

[0028] In addition, the cylindrical directional coating optical fiber preform provided by the present application does not need to uniformly coat the side of the optical fiber arrangement, and the spacing between the optical fibers does not need to be fully flowed with the coating material, so that the optical fiber arrangement in the packaging piece is much closer than the common optical fiber cylindrical coating clamp, effectively improves the production efficiency of the cylindrical coating optical fiber, and is suitable for batch mass production.

[0029] The application provides a use method of the cylindrical directional coating optical fiber preform, which ensures that the light transmission direction of the non-circumferentially uniform cylindrical coating optical fiber is accurately arranged in an optical path, and has good precision and high yield. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 is a top view of the cylindrical directional coating optical fiber preform provided by the embodiment of the application when the cylindrical directional coating optical fiber preform is opened;

[0031] Figure 2 is a top view of the cylindrical directional coating optical fiber preform provided by the embodiment of the application when the cylindrical directional coating optical fiber preform is closed;

[0032] Figure 3 is a schematic view of a fiber coating cross section of the cylindrical directional coating optical fiber preform provided by the application;

[0033] Figure 4 is a schematic view of a cross section structure of a cylindrical circumferentially uniform coating optical fiber in the prior art.

[0034] In all the drawings, the same reference signs are used to represent the same elements or structures, in which: 1 is a rectangular frame, 2 is a pressing strip, 3 is a wire slot, 4 is an optical fiber, 5 is a magnet, and 6 is a coating layer. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical scheme and advantages of the application more clear, the application is further described in detail below with reference to the embodiments. It should be understood that the specific embodiments described herein are only used to explain the application and do not limit the application. In addition, the technical features involved in each embodiment of the application described below can be combined with each other as long as they do not conflict with each other.

[0036] Unlike the circumferentially uniform fiber cylindrical coating technical route in the prior art, the application develops a fiber cylindrical coating technical scheme that only coats the fiber cylindrical surface in the light transmission direction to a preset thickness and determines the light transmission direction. The feature of this cylindrical coating technical scheme is directional coating of the fiber cylindrical surface, and the directional coating of the fiber cylindrical surface is specifically realized by a packaging member.

[0037] The cylindrical directional coating optical fiber preform provided by the application, as shown in Figures 1-2 includes a packaging member and a coated optical fiber.

[0038] The packaging member has a rectangular frame and a pressing strip; one pair of side edges of the rectangular frame has a packaging slot.

[0039] The rectangular frame can be made of stainless steel, aluminum alloy, copper, etc. The size is determined according to the opening size of the coated umbrella, and the thin and long and soft characteristics of the optical fiber are also considered. In order to ensure that the optical fiber is fixed firmly and is not easy to deform, the length of the rectangular frame is preferably 30-200 mm, and the width is preferably 30-200 mm.

[0040] The pressing strip is detachably connected with the packaging groove. In a preferred embodiment, one end or one side of the pressing strip is connected with the packaging groove through a hinge, and / or the pressing strip is connected with the packaging groove through magnetic attraction. In a preferred embodiment, both the hinge and the magnetic attraction are used. In order to avoid the traditional fixing by screws, one end of the pressing strip is connected with the frame through a hinge, and the other end is provided with a plurality of magnets to form an opening and closing type connection structure, so as to fix the uniformly arranged optical fibers. Compared with the screw which needs to be tightened and loosened every time, the operation of the magnetic attraction is simple and convenient.

[0041] The direction perpendicular to the plane of the packaging member is the light transmission direction;

[0042] The two ends of the coated optical fiber are fixed in the packaging grooves on both sides of the packaging member. The coated optical fiber has a preset thickness of coating on the light transmission direction of the cross section. The coating thickness on the non-light transmission direction of the cross section of the coated optical fiber is smaller than that on the light transmission direction. The preset coating thickness is determined according to the different wavelengths of the optical path in the application process. The coated optical fiber with this thickness is suitable for various wavelength optical path scenes such as 976 nm, 915 nm and 808 nm. The preset coating thickness can be accurately controlled by real-time monitoring of the coating thickness monitoring system of the coating machine. The film thickness monitored by the monitoring system is consistent with the film thickness in the light transmission direction. The coated preform placed on the coated umbrella frame receives more film material and has a larger film thickness at the position of the light transmission direction of the coated optical fiber due to the arc structure of the coated umbrella frame and the optical fiber column at the same time. The film thickness of the non-light transmission direction of the coated optical fiber is small.

[0043] The coated optical fiber has a plurality of roots, which are arranged in parallel to the other pair of side surfaces of the rectangular frame according to a preset interval or position. The packaging groove is filled with glue, so that the coated optical fiber is fixed without rotation. The groove edge of the packaging groove has a wire groove, and the two ends of the coated optical fiber are embedded and clamped in the wire groove. The wire groove is square, V-shaped, U-shaped or O-shaped. In order to avoid the damage of the optical fiber caused by the collision of the optical fiber during clamping, the wire groove is evenly distributed on both sides of the rectangular frame, which is used to limit and fix the optical fiber. The wire groove width is 0.1-3 mm, and the depth is 1-10 mm. The diameter of the O-shaped wire groove is 0.1-3 mm. The length of the wire groove is the same as the width of the rectangular frame.

[0044] Generally, the cylindrical coated optical fiber is used as a micro light transmission lens. Due to the miniaturization of the device, the lens manufacturing process is not easy to control, and the fiber needs to be uniformly coated around the cylinder. However, this coating method not only has high material cost, but also has very high process requirements. Generally, in order to realize the uniform coating of the fiber around the cylinder, rotation is required during coating, which reduces the consistency of the coating thickness between different cylindrical coated optical fibers in the same batch, and increases the process control cost. The cylindrical directional coated optical fiber preform provided by the application completely changes the preparation process of the fiber cylinder lens by using a rectangular frame packaging piece, and uses the whole preform as a lens manufacturing workpiece, so that the coating direction and the light transmission direction of the lens manufacturing are consistent, only the coating layer with a preset thickness in the light transmission direction is provided, the coating material cost and the coating process difficulty are reduced, and the consistency of the coating thickness of the cylindrical coating of different optical fibers is improved.

[0045] Especially, the optical fiber is fixed in the slot by using glue, so that the optical fiber and the rectangular frame are more stable and cannot rotate relatively, and the process precision of the light transmission surface during coating and subsequent device processing is ensured. The glue can be one of UV curing glue, heat curing glue and the like.

[0046] Due to the cylindrical coating technology adopted by the application, the side of the fiber arrangement does not need to be uniformly coated, and the spacing between the fibers does not need to be fully flowed with the coating material, so that theoretically, the spacing between the fibers can exist, in order to facilitate the use of the preform, the coated optical fiber is separated from the cylindrical directional coated optical fiber preform, and the spacing between the optical fibers is greater than or equal to 0.5 mm; generally less than or equal to 2 mm, which can effectively improve the arrangement density of the optical fiber and improve the production efficiency, and is suitable for large-scale production. When the slot fixing scheme is adopted, that is, the slot spacing is greater than or equal to 0.5 mm, and preferably less than or equal to 2 mm.

[0047] The preparation method of the cylindrical directional coated optical fiber preform provided by the application comprises the following steps:

[0048] Clamping: the two ends of the bare optical fiber are fixed in the packaging grooves on the two sides of the packaging piece without rotation, to obtain a to-be-coated piece; specifically including the following sub-steps: placing the optical fiber in the slot at a preset spacing or position; uniformly dispensing glue in the packaging groove; the dispensing glue is preferably UV curing glue or heat curing glue; fixing: curing the glue in the packaging groove where the optical fiber is placed to fix the optical fiber and the packaging groove, so that there is no relative rotation between them; packaging: assembling a pressing strip on the packaging groove. The order of the dispensing glue and the optical fiber placing steps can be exchanged.

[0049] Coating: the coated part is placed on the coating umbrella frame, and the two sides are statically coated to obtain the cylindrical directional coating optical fiber preform. The present application can produce qualified film layer in the optical fiber light direction by static coating without fiber rotation coating, which greatly reduces the processing difficulty and can be applied to general coating umbrella frame. The coating method can use one of vacuum evaporation coating or sputtering coating method.

[0050] The application provides a use method of the cylindrical directional coating optical fiber preform.

[0051] The cylindrical directional coating optical fiber preform is fixed in a preset direction, so that the light transmission direction of the cylindrical coating optical fiber is consistent with the light transmission direction of the optical path; and then the coating optical fiber is separated from the cylindrical directional coating optical fiber preform.

[0052] In the application, the light transmission surface of the optical fiber is determined by the direction of the whole preform, and the direction perpendicular to the plane where the packaging element is located is the light transmission direction, so that the light transmission direction of the optical fiber after coating can be accurately controlled by the whole cylindrical directional coating optical fiber preform, and the device manufacturing cost and process difficulty are effectively reduced.

[0053] The following is an embodiment:

[0054] Embodiment 1:

[0055] Reference Figures 1-2 An optical fiber cylindrical coating preform, comprising a hollow rectangular frame (1) and a pressing strip (2) linked with the frame, the hollow rectangular frame (1) is uniformly arranged with wire grooves (3) and fixing glue on both sides, for bearing and supporting both ends of the optical fiber (4) and fixing the optical fiber, one end of the pressing strip is connected with the frame through a hinge, and the other end is provided with a plurality of magnets (5) to form an opening and closing type connection structure for fixing the uniformly arranged optical fiber.

[0056] The hollow rectangular frame (1) and the pressing strip (2) are made of 304 stainless steel; the size of the hollow rectangular frame (1) is 100*100mm; the wire groove (3) is a square hole, and the width of the square hole is 0.5mm and the depth is 1mm; the wire groove spacing is 0.5mm, and the optical fiber is fixed in the wire groove; the optical fiber is coated in the light transmission direction. The glue is UV curing glue, and the curing wavelength is 365nm.

[0057] The manufacturing method is as follows:

[0058] Clamping: the optical fiber is cut into a length equal to the length of the rectangular frame; the coating layer on the surface of the optical fiber is removed by physical or chemical means; the optical fiber after removing the coating layer is placed in the wire groove in parallel; the optical fiber in the wire groove is evenly dotted with glue, and the optical fiber is fixed by closing the pressing strip after the glue is completely cured; the completely fixed optical fiber clamp is cleaned by ultrasonic wave to remove dirt and impurity residues on the cylindrical surface of the optical fiber;

[0059] Coating: clean optical fiber two column surface coating.

[0060] Specific process parameters:

[0061] (1) cut the 105 μm core diameter fiber into a rectangular frame of equal length; (2) use physical or chemical methods to remove the coating layer on the surface of the fiber; (3) place the fiber without coating layer in the wire groove in parallel; (4) evenly point the UV curing glue on the wire groove fiber, and use 365 nm wavelength ultraviolet light to irradiate completely, then close the pressing strip to fix the fiber. (5) clean the completely fixed fiber clamp by ultrasonic cleaning to remove dirt and impurity residues on the fiber column surface; (6) clean the optical fiber by vacuum evaporation coating method to coat two column surfaces.

[0062] Example 2:

[0063] Reference Figures 1-2 An optical fiber column surface coating preform, comprising a hollow rectangular frame (1) and a pressing strip (2) linked to the frame, the hollow rectangular frame (1) is evenly distributed with wire grooves (3) and fixing glue on both sides, used to carry and support the two ends of the optical fiber (4) and fix the optical fiber, one end of the pressing strip is connected to the frame through a hinge, and the other end is provided with a plurality of magnets (5) to form an opening and closing type connection structure to fix the evenly arranged optical fiber.

[0064] The hollow rectangular frame (1) and the pressing strip (2) are made of brass; the size of the hollow rectangular frame (1) is 60*60mm; the wire groove (3) is a circular hole with a diameter of 1mm; the wire groove spacing is 2mm; the optical fiber is fixed in the wire groove, and the optical fiber is coated in the light transmission direction. The glue is a heat-curing glue.

[0065] Its manufacturing method is:

[0066] Clamping: cut the optical fiber into a rectangular frame of equal length; use physical or chemical methods to remove the coating layer on the surface of the fiber; place the fiber without coating layer in the wire groove in parallel; evenly point the glue on the wire groove fiber, and wait for the glue to completely cure, then close the pressing strip to fix the fiber; clean the completely fixed fiber clamp by ultrasonic cleaning to remove dirt and impurity residues on the fiber column surface;

[0067] Coating: clean optical fiber two column surface coating.

[0068] Specific process parameters:

[0069] (1) cut the 135 μm core diameter fiber into the length of the rectangular frame; (2) remove the coating layer on the surface of the fiber by using acetone and other chemical solvents; (3) place the fiber after removing the coating layer in the wire groove in parallel; (4) evenly point the hot curing glue on the fiber in the wire groove, and after heating and complete curing, close the pressing strip to fix the fiber; (5) clean the completely fixed fiber clamp by ultrasonic cleaning to remove the dirt and impurity residues on the fiber column surface; (6) coat the cleaned fiber with two column surfaces by using the magnetic control sputtering coating method.

[0070] Example 3

[0071] With reference to Figures 1-2 A fiber column surface coating preform includes a hollow rectangular frame (1) and a pressing strip (2) linked with the frame, the hollow rectangular frame (1) is distributed with evenly arranged wire grooves (3) and fixing glue on both sides, for bearing and supporting the two ends of the fiber (4) and fixing the fiber, one end of the pressing strip is connected with the frame through a hinge, and the other end is provided with a plurality of magnets (5) to form an opening and closing type connection structure for fixing the evenly arranged fiber.

[0072] The hollow rectangular frame (1) and the pressing strip (2) are made of aluminum alloy; the size of the hollow rectangular frame (1) is 150*150mm; the wire groove (3) is a square hole, and the width of the square hole is 1mm and the depth is 2mm; the wire groove spacing is 1.5mm; the glue is UV curing glue, and the curing wavelength is 395nm. The fiber is fixed in the wire groove, and the fiber is coated on the light transmission direction.

[0073] The manufacturing method is as follows:

[0074] Clamping: cut the fiber into the length of the rectangular frame; remove the coating layer on the surface of the fiber by using physical or chemical methods; place the fiber after removing the coating layer in the wire groove in parallel; evenly point the glue on the fiber in the wire groove, and after the glue is completely cured, close the pressing strip to fix the fiber; clean the completely fixed fiber clamp by ultrasonic cleaning to remove the dirt and impurity residues on the fiber column surface;

[0075] Coating: coat the cleaned fiber with two column surfaces.

[0076] Specific process parameters:

[0077] (1) cut the 135 μm core diameter fiber into the length of the rectangular frame; (2) remove the coating layer on the surface of the fiber by using acetone and other chemical solvents; (3) place the fiber after removing the coating layer in the wire groove in parallel; (4) evenly point the hot curing glue on the fiber in the wire groove, and after heating and complete curing, close the pressing strip to fix the fiber; (5) clean the completely fixed fiber clamp by ultrasonic cleaning to remove the dirt and impurity residues on the fiber column surface; (6) coat the cleaned fiber with two column surfaces by using the magnetic control sputtering coating method.

[0078] Embodiment 4

[0079] The method for using the optical fiber cylindrical coating preform made in Embodiments 1 to 3 is as follows:

[0080] The cylindrical coating optical fiber preform is vertically arranged in the light path, the light passing direction of the cylindrical coating optical fiber is made consistent with the light passing direction of the light path by the light path, the optical fiber is fixed in the light path, cutting or opening the pressing strip to remove the glue and the optical fiber is taken out, and then the coating optical fiber is separated from the cylindrical coating optical fiber preform.

[0081] Those skilled in the art will easily understand that the above description is only the preferred embodiment of the present application, and is not intended to limit the present application, and any modification, equivalent replacement and improvement within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A cylindrical, directionally coated optical fiber preform, characterized by, The package and the coated fiber are included; The package has a rectangular frame and a pressing strip; a pair of side edges of the rectangular frame has a package groove; the pressing strip is detachably matched with the package groove; The direction perpendicular to the plane where the package is located is the light transmission direction; Two ends of the coated fiber are respectively fixed in the package grooves on both sides of the package; the coated fiber adopts two-side static coating, so that: The coated fiber has a preset thickness of coating in the light transmission direction of the cross section; the coating thickness in the non-light transmission direction of the cross section is less than the coating thickness in the light transmission direction.

2. The cylindrical, orientation-patterned optical fiber preform of claim 1, wherein, The coated fiber has a plurality of fibers arranged in parallel to the other pair of side edges of the rectangular frame according to a preset interval or position; the interval is greater than or equal to 0.5 mm and less than or equal to 2 mm.

3. The cylindrical, orientation-patterned optical fiber preform of claim 1, wherein, The package groove of the rectangular frame is filled with glue, so that the coated fiber is fixed without rotation; the glue is optical glue; the length of the rectangular frame ranges from 30 mm to 200 mm.

4. The cylindrical, orientation-patterned optical fiber preform of claim 1, wherein, The groove edge of the package groove has a wire groove, and the two ends of the coated fiber are clamped and fitted in the wire groove.

5. The cylindrical, orientation-patterned optical fiber preform of claim 4, wherein, The wire groove is square, V-shaped, U-shaped or O-shaped.

6. The cylindrical, orientation-patterned optical fiber preform of claim 1, wherein, One end or one side of the pressing strip is matched with the package groove through a hinge, and / or the pressing strip is matched with the package groove through magnetic attraction.

7. A method of making a cylindrical, orientation-patterned optical fiber preform according to any one of claims 1 to 6, wherein The method includes the following steps: Clamping: the two ends of the bare optical fiber are fixed without rotation in the package grooves on both sides of the package to obtain a to-be-coated piece; Coating: the to-be-coated piece is placed on a coating umbrella stand for two-side static coating to obtain the cylindrical directional coated fiber preform.

8. The method for preparing the cylindrical oriented coated optical fiber preform as described in claim 7, characterized in that, The clamping step includes the following sub-steps: Placing the optical fiber: the optical fiber is placed in the wire groove at a preset interval or position of the package groove; Dispensing: uniform dispensing is performed in the package groove; UV curing glue or heat curing glue is used for dispensing; Fixing: the glue in the package groove where the optical fiber is placed is cured to fix the optical fiber and the package groove, so that there is no relative rotation between them; Packaging: the pressing strip is assembled on the package groove.

9. The method for preparing a cylindrical oriented coated optical fiber preform as described in claim 7, characterized in that, The coating step adopts vacuum evaporation coating or sputtering coating.

10. A method of using a cylindrical, directionally solidified optical fiber preform according to any one of claims 1 to 6, wherein The method includes the following steps: The cylindrical directional coated fiber preform is fixed in a preset direction to make the light transmission direction of the cylindrical directional coated fiber consistent with the light transmission direction of the optical path; Then the coated fiber is separated from the cylindrical directional coated fiber preform.

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