Method for manufacturing an optical fiber core

Abstract

The application provides a preparation method of an optical fiber core layer, and the optical fiber comprises a deposition tube, a head tube and a tail tube, and the preparation method comprises the following steps: fixing the head tube and the tail tube at two ends of a deposition lathe through a clamp respectively; placing the deposition tube between the head tube and the tail tube, and placing a concentric part at a position corresponding to the deposition tube, so that the head tube, the deposition tube and the tail tube are arranged along the same axis through the concentric part; heating at least one of opposite ends of the head tube and the deposition tube, so that the head tube and the deposition tube are fused; heating at least one of opposite ends of the tail tube and the deposition tube, so that the tail tube and the deposition tube are fused; and after the fusion of the head tube, the deposition tube and the tail tube is completed, a core layer is formed on the head tube, the deposition tube and the tail tube. Through the concentric part arranged in the fusion process of the deposition tube, the three tubes of the deposition tube, the head tube and the tail tube can be kept concentric after being fused, and then the core layer is deposited uniformly, so that the quality of the optical fiber preform rod is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of optical fiber preparation, in particular to a preparation method of an optical fiber core layer. BACKGROUND

[0002] An optical fiber, full name optical waveguide fiber, is a fiber made of glass or plastic. The optical fiber mainly consists of a core layer (fiber core), a cladding layer and a coating layer. The specific preparation process is as follows: first, deposit the core layer in the deposition tube by the MCVD or PCVD method, then melt and shrink the deposition tube into a core rod, according to the optical fiber core cladding ratio requirement, a sleeve pipe with a certain thickness is sleeved outside the core rod, and the core rod and the sleeve pipe are further melted and shrunk into a preform rod, and the preform rod that passes the detection is placed on a drawing tower for drawing. The periphery of the fiber is uniformly coated with an inner coating layer and a coating layer during the drawing process to form an optical fiber. The cladding layer of the double-clad optical fiber is divided into an inner cladding layer and an outer cladding layer, and the deposition tube and the sleeve pipe together form the inner cladding layer of the optical fiber, and the inner coating layer is the outer cladding layer of the optical fiber; the deposition tube and the sleeve pipe of the single-clad optical fiber together form the cladding layer of the optical fiber.

[0003] During the deposition of the core layer, a head pipe and a tail pipe need to be fused to the two ends of the deposition tube. The first is to facilitate the connection of the deposition tube to the clamps at both ends of the deposition lathe, and the second is to effectively utilize the preform rod to avoid waste. The head pipe, the deposition tube and the tail pipe need to be concentrically arranged to ensure that the deposition tube is in a horizontal position, so that the core layer can be uniformly deposited. At the same time, the temperature of the outer wall of the deposition tube needs to be detected during the deposition process. The horizontal placement of the deposition tube can also improve the temperature accuracy of the detection head, so that the deposition temperature can be accurately adjusted during the deposition process, and the quality of the core layer can be improved.

[0004] In the prior art, the deposition tube, the head pipe and the tail pipe need to be manually fused on the deposition lathe. Due to the manual operation, there will be certain errors (such as hand jitter, observation deviation of the concentric position of the three pipes, etc.), which will cause the three pipes of the deposition tube, the head pipe and the tail pipe to be fused out of concentricity, thereby causing the core layer to be deposited unevenly, affecting the quality of the preform rod, and making the quality of the optical fiber unable to meet the customer's requirements, resulting in economic losses. SUMMARY

[0005] The present application provides a preparation method of an optical fiber core layer to solve the problem that the three pipes of the deposition tube, the head pipe and the tail pipe are fused out of concentricity due to the error of manual fusion in the existing optical fiber preparation process, thereby causing the core layer to be deposited unevenly and affecting the quality of the preform rod.

[0006] The present application provides a preparation method of an optical fiber core layer. The optical fiber includes a deposition tube, a head pipe and a tail pipe. The preparation method comprises the following steps:

[0007] Step 1: fixing the head pipe and the tail pipe at both ends of the deposition lathe by clamps respectively;

[0008] Step 2, placing the deposition tube between the head tube and the tail tube, and placing a concentric part corresponding to the position of the deposition tube, and arranging the head tube, the deposition tube and the tail tube along the same axis through the concentric part;

[0009] Step 3, heating at least one of the opposite ends of the head tube and the deposition tube to fuse the head tube and the deposition tube;

[0010] Step 4, heating at least one of the opposite ends of the tail tube and the deposition tube to fuse the tail tube and the deposition tube;

[0011] Step 5, after the head tube, the deposition tube and the tail tube are fused, a core layer is formed on the head tube, the deposition tube and the tail tube.

[0012] According to the preparation method of the optical fiber core layer provided by the application, in the step 2, the deposition tube is fixed on the deposition lathe through the concentric part, the concentric part includes a base, two supports and two half-buckle clamps, the base is installed on the deposition lathe, the two supports are vertically arranged on the base and are located on opposite sides of the base respectively, and the two half-buckle clamps are arranged on the top of the two supports respectively, and the deposition tube is clamped on the concentric part through the two half-buckle clamps.

[0013] According to the preparation method of the optical fiber core layer provided by the application, a plurality of sliding grooves with scales are arranged on the base, the sliding grooves extend along the length direction and the width direction of the base respectively, the sliding grooves extending along the length direction and the width direction of the base are arranged in a cross manner, the two supports are slidably installed in the sliding grooves, and the heights of the two supports in the vertical direction are adjustable.

[0014] In the step 2, the step of arranging the head tube, the deposition tube and the tail tube along the same axis through the concentric part includes: adjusting the positions of the two supports in the sliding grooves to adjust the position of the deposition tube in the horizontal direction relative to the head tube and the tail tube, and / or adjusting the heights of the two supports to adjust the position of the deposition tube in the vertical direction relative to the head tube and the tail tube, so that the head tube, the deposition tube and the tail tube are arranged along the same axis.

[0015] According to the preparation method of the optical fiber core layer provided by the application, the two half-buckle clamps are rotatably connected with the two supports respectively, the clamp is rotatably connected with the deposition lathe, the half-buckle clamps are used to drive the deposition tube to rotate, and the half-buckle clamps are kept rotating in the same direction and at the same speed as the clamp.

[0016] The diameter of the two half-clasp clamps can be adjusted, and the inner side of the two half-clasp clamps and the contact surface of the deposition pipe are soft contact surfaces.

[0017] The half-clasp clamps are composed of two identical half-rings, one end of the two half-rings is movably connected, and the other end of the two half-rings can be locked or opened through buckling.

[0018] In step 1, the two clamps respectively clamp and fix the opposite ends of the head pipe and the tail pipe at the two ends of the deposition lathe, and the head pipe and the tail pipe are arranged along the same axis.

[0019] In step 3, after heating at least one of the opposite ends of the head pipe and the deposition pipe, and before fusion splicing of the head pipe and the deposition pipe, the following steps are further included: flaring operation is performed on the heated end of the head pipe and the deposition pipe to be flared; and / or,

[0020] In step 4, after heating at least one of the opposite ends of the tail pipe and the deposition pipe, and before fusion splicing of the tail pipe and the deposition pipe, the following steps are further included: flaring operation is performed on the heated end of the tail pipe and the deposition pipe to be flared.

[0021] In step 3, when the flaring operation is performed, at least one of the head pipe and the deposition pipe that needs to be flared rotates at a uniform speed on the deposition lathe; when the fusion splicing operation is performed, the head pipe and the deposition pipe both rotate at a uniform speed on the deposition lathe.

[0022] In step 4, when the flaring operation is performed, at least one of the tail pipe and the deposition pipe that needs to be flared rotates at a uniform speed on the deposition lathe; when the fusion splicing operation is performed, the tail pipe and the deposition pipe both rotate at a uniform speed on the deposition lathe.

[0023] In step 3, the fusion splicing of the head pipe and the deposition pipe includes: heating at least one of the opposite ends of the head pipe and the deposition pipe to a molten state, and then contact fusion splicing of the opposite ends of the head pipe and the deposition pipe.

[0024] In the step 4, the step of fusing the tail pipe and the deposition pipe includes: heating at least one of the opposite ends of the tail pipe and the deposition pipe to a molten state, and then fusing the opposite ends of the tail pipe and the deposition pipe by contact.

[0025] The above technical solutions of the present application have the following beneficial effects:

[0026] The preparation method of the optical fiber core layer provided by the present application sets a concentric component under the deposition pipe during the fusion process of the deposition pipe, which can keep the three pipes of the deposition pipe, the head pipe and the tail pipe concentric after fusion, and can avoid the problem of non-concentricity of the three pipes caused by manual operation errors (such as hand shaking and observation deviation). The high concentricity ensures that the core layer material can be uniformly distributed on the pipe walls of the deposition pipe, the head pipe and the tail pipe during the deposition process, avoids quality fluctuations caused by uneven deposition, and significantly improves the uniformity and consistency of the core layer. Due to the significant improvement in the uniformity of the core layer deposition, the prepared optical fiber preform is also more uniform in structure, reducing internal defects and stress concentration points, and thus improving the overall quality of the optical fiber preform. This high-quality preform can significantly reduce the attenuation, dispersion and other adverse factors of the optical fiber during subsequent fiber drawing, improve the transmission performance of the optical fiber, meet the customer's demand for high-quality optical fiber, and reduce the unqualified rate of the optical fiber, reduce the rework and waste caused by quality problems, thereby significantly reducing the production cost. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the present application or prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0028] Figure 1 is a flow chart of the preparation method of the optical fiber core layer provided by the present application.

[0029] Figure 2 is a schematic diagram of the optical fiber core layer deposition operation platform provided by the present application.

[0030] Figure 3 is a schematic diagram of the base structure of the concentric component provided by the present application.

[0031] Figure 4 is a cross-sectional view of the flaring component provided by the present application.

[0032] Figure 5 is a front view of the first conical column or the second conical column of the flaring component provided by the present application.

[0033] Reference signs:

[0034] 1: head tube; 2: head tube flared end; 3: tail tube; 4: tail tube flared end; 5: deposition tube; 6: first clamp; 7: second clamp; 8: base; 9: first support; 10: second support; 11: first half snap ring; 12: second half snap ring; 13: first buckle; 14: second buckle; 15, first conical column; 16, second conical column; 17, handle; 18, first handle clamping groove; 19, second handle clamping groove; 20, third handle clamping groove; 100, flared part; 801: sliding groove. DETAILED DESCRIPTION

[0035] To make the objectives, technical solutions and advantages of the present application clearer, the technical solutions in the present application will be described clearly and completely below in conjunction with the drawings in the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0036] The preparation method of the optical fiber core layer of the present application will be described in detail below. Figures 1-5 The preparation method of the optical fiber core layer of the present application will be described in detail below. Figure 1 is a flow chart of the preparation method of the optical fiber core layer provided by the present application, Figure 2 is a schematic diagram of the deposition operation platform of the optical fiber core layer provided by the present application. As Figure 1 shown, the preparation method of the optical fiber core layer of the present application includes the following steps:

[0037] Step 1, the head tube 1 and the tail tube 3 are respectively fixed at both ends of the deposition lathe by the clamps;

[0038] Step 2, the deposition tube 5 is placed between the head tube 1 and the tail tube 3, and a concentric part is placed at the position corresponding to the deposition tube 5, so that the head tube 1, the deposition tube 5 and the tail tube 3 are arranged along the same axis by the concentric part;

[0039] Step 3, at least one of the opposite ends of the head tube 1 and the deposition tube 5 is heated to fuse the head tube 1 and the deposition tube 5;

[0040] Step 4, at least one of the opposite ends of the tail tube 3 and the deposition tube 5 is heated to fuse the tail tube 3 and the deposition tube 5;

[0041] Step 5, after the head tube 1, the deposition tube 5 and the tail tube 3 are fused, the core layer is formed on the head tube 1, the deposition tube 5 and the tail tube 3.

[0042] It should be noted that the opposite ends of the head tube 1 and the sedimentation tube 5 refer to the end of the head tube 1 that is close to (or faces) the sedimentation tube 5 and the end of the sedimentation tube 5 that is close to (or faces) the head tube 1; similarly, the opposite ends of the tail tube 3 and the sedimentation tube 5 refer to the end of the tail tube 3 that is close to (or faces) the sedimentation tube 5 and the end of the sedimentation tube 5 that is close to (or faces) the tail tube 3.

[0043] Specifically, in this embodiment, the fixture includes a first fixture 6 and a second fixture 7, which are respectively disposed at both ends of the deposition lathe. In step 1, the first fixture 6 and the second fixture 7 respectively clamp and fix the opposite ends of the head tube 1 and the tail tube 3 (i.e., the ends of the head tube 1 and the tail tube 3 that are far apart from each other), and make the head tube 1 and the tail tube 3 arranged along the same axis.

[0044] In step 2, the deposition tube 5 is fixed to the deposition lathe by a concentric component. Specifically, the concentric component is located below the deposition tube 5. The concentric component includes a base 8, two supports (i.e., the first support 9 and the second support 10), and two semi-fastening retaining rings (i.e., the first semi-fastening retaining ring 11 and the second semi-fastening retaining ring 12). The base 8 is mounted on the deposition lathe, and the first support 9 and the second support 10 are both vertically mounted on the base 8 and located on opposite sides of the base 8. The first semi-fastening retaining ring 11 and the second semi-fastening retaining ring 12 are respectively located on the top of the first support 9 and the second support 10, and the deposition tube 5 is clamped to the concentric component by the first semi-fastening retaining ring 11 and the second semi-fastening retaining ring 12.

[0045] Combination Figure 2 and Figure 3 As shown, the base 8 has multiple graduated grooves 801, which extend along the length and width directions of the base 8 respectively. These grooves 801 intersect each other. The first support 9 and the second support 10 are slidably mounted in the grooves 801, allowing them to move forward, backward, left, and right on the base 8. Furthermore, the vertical height of the first support 9 and the second support 10 is adjustable. The method of height adjustment for the first support 9 and the second support 10 is not limited here.

[0046] Specifically, in step 2, the step of arranging the head tube 1, the deposition tube 5 and the tail tube 3 along the same axis by the concentric component includes: adjusting the position of the first support 9 and the second support 10 in the sliding groove 801 to adjust the position of the deposition tube 5 in the horizontal direction relative to the head tube 1 and the tail tube 3; and / or adjusting the height of the first support 9 and the second support 10 to adjust the position of the deposition tube 5 in the vertical direction relative to the head tube 1 and the tail tube 3, so as to arrange the head tube 1, the deposition tube 5 and the tail tube 3 along the same axis, thereby avoiding the problem of the three tubes of the deposition tube, the head tube and the tail tube being fused out of concentricity due to errors in manual visual operation and the like.

[0047] Further, the first half buckle clasp 11 and the second half buckle clasp 12 are respectively rotationally connected with the first support 9 and the second support 10, and the first clamp 6 and the second clamp 7 are respectively rotationally connected with the deposition lathe, and the first half buckle clasp 11 and the second half buckle clasp 12 are both used for clamping the deposition tube 5 and jointly driving the deposition tube 5 to rotate, and the first clamp 6 and the second clamp 7 are respectively used for driving the head tube 1 and the tail tube 3 to rotate.

[0048] Further, the diameters of the first half buckle clasp 11 and the second half buckle clasp 12 are both adjustable. Specifically, each half buckle clasp is composed of two identical half rings which are buckled relative to each other, wherein one end of the two half rings is movably connected, and the other end of the two half rings can be locked or opened by a buckle (the first buckle 13 or the second buckle 14).

[0049] In step 2, after the concentric component is placed under the deposition tube 5, the inner diameter of the first half buckle clasp 11 and the second half buckle clasp 12 is first adjusted to be the same as the diameter of the deposition tube 5; then the first half buckle clasp 11 and the second half buckle clasp 12 are opened, the deposition tube 5 is placed in the first half buckle clasp 11 and the second half buckle clasp 12, the first half buckle clasp 11 and the second half buckle clasp 12 are closed, and the first half buckle clasp 11 and the second half buckle clasp 12 are locked by the first buckle 13 and the second buckle 14; then the height and position of the first support 9 and the second support 10 are adjusted to arrange the head tube 1, the deposition tube 5 and the tail tube 3 concentrically; finally, the rotation direction and rotation speed of the first half buckle clasp 11 and the second half buckle clasp 12 are set by the control system, so that the rotation direction and rotation speed of the first half buckle clasp 11 and the second half buckle clasp 12 driving the deposition tube 5 during the fusion operation are consistent with the rotation direction and rotation speed of the first clamp 6 and the second clamp 7.

[0050] Further, the control system is connected with the driving components of the first and second half-clasps 11 and 12 and the driving components of the first and second clamps 6 and 7, so as to control the first and second half-clasps 11 and 12 to rotate at the same speed and in the same direction with the first and second clamps 6 and 7 at the two ends of the deposition lathe, thereby ensuring that the deposition tube 5, the head tube 1 and the tail tube 3 rotate at the same speed and in the same direction, and further improving the concentricity of the three-tube fusion.

[0051] In an embodiment, the contact surfaces between the inner sides of the first and second half-clasps 11 and 12 and the deposition tube 5 are soft contact surfaces, so as to avoid damaging the deposition tube 5 when the first and second half-clasps 11 and 12 contact the deposition tube 5.

[0052] In an embodiment, the step 3 further includes the following step after heating at least one of the opposite ends of the head tube 1 and the deposition tube 5, and before the head tube 1 and the deposition tube 5 are fused: flaring the heated end of the head tube 1 and the deposition tube 5 to be flared, so as to better fuse the head tube 1 and the deposition tube 5.

[0053] Specifically, the step of flaring the heated end of the head tube 1 and the deposition tube 5 to be flared includes: using a flaring component to flare the heated end of the head tube 1 and the deposition tube 5 to be flared, so that the diameters of the two ends of the head tube 1 and the deposition tube 5 close to each other are the same.

[0054] It can be understood that the diameters of the commonly used head tube, deposition tube and tail tube are not necessarily the same. The purpose of the flaring operation is to make the two pipes to be fused keep the same diameter at the fusion position, so as to better complete the fusion and improve the uniformity of the core deposition. The flaring operation can be performed on one of the two adjacent pipes with smaller diameter, or on both of the two adjacent pipes, which is not limited here.

[0055] In combination with FIGS. 1 to 4, the flaring component 100 is used to flare the heated end of the head tube 1 and the deposition tube 5 to be flared, so that the diameters of the two ends of the head tube 1 and the deposition tube 5 close to each other are the same. Figure 4 and Figure 5 As shown in FIGS. 1 to 4, the flaring part of the flaring component 100 is in the shape of a cone. Specifically, the flaring component 100 includes a first conical column 15, a second conical column 16 and a handle 17, the diameters of the first and second conical columns 15 and 16 are different, and the bottoms of the first and second conical columns 15 and 16 are fixedly connected at a preset angle. First and second handle clamping grooves 18 and 19 are respectively arranged at the center positions of the bottoms of the first and second conical columns 15 and 16, and a third handle clamping groove 20 is arranged at the bottom of the connection between the first and second conical columns 15 and 16. The handle 17 is connected with the first and / or second conical columns 15 and 16 through one of the first, second and third handle clamping grooves 18, 19 and 20. Of course, in other embodiments, the handle 17 can be connected with the first and / or second conical columns 15 and 16 in other ways.

[0056] In combination Figure 2 , Figure 4 and Figure 5 , the step of expanding the heated end of the head pipe 1 and the deposition pipe 5 to be expanded by the expanding component 100 includes: inserting the top end of the first conical column 15 or the second conical column 16 of the expanding component 100 into the heated end of the head pipe 1 and / or the deposition pipe 5 to be expanded, so that the heated end to be expanded forms a corresponding expanded end.

[0057] Specifically, when the top end of the first conical column 15 is inserted into the heated end of the head pipe 1 and / or the deposition pipe 5 to be expanded, the handle 17 is fixed on the first conical column 15 through the first handle clamping slot 18, and at this time, the handle 17 is coaxially arranged with the first conical column 15. When the top end of the second conical column 16 is inserted into the heated end of the head pipe 1 and / or the deposition pipe 5 to be expanded, the handle 17 is fixed on the second conical column 16 through the second handle clamping slot 19, and at this time, the handle 17 is coaxially arranged with the second conical column 16.

[0058] Wherein, when the expanding operation is performed, at least one of the head pipe 1 and the deposition pipe 5 to be expanded is uniformly rotated on the deposition lathe, and the heated end of the head pipe 1 and the deposition pipe 5 to be expanded is heated by the lathe heating torch, and when the heated end of the head pipe 1 and the deposition pipe 5 to be expanded is in a molten state, the expanding operation is performed to form a uniform and symmetrical expanded end.

[0059] From the perspective of saving process and simplifying process, when the diameters of the head pipe 1 and the deposition pipe 5 are different, the one with smaller diameter can be expanded. For example, when the diameter of the head pipe 1 is smaller than that of the deposition pipe 5, the end of the head pipe 1 close to the deposition pipe 5 is expanded as needed before the head pipe 1 and the deposition pipe 5 are fused, to form a head pipe expanded end 2, so that the diameter of the head pipe expanded end 2 is consistent with that of the side of the deposition pipe 5 opposite to the head pipe 1, so that the head pipe 1 and the deposition pipe 5 are better fused.

[0060] Furthermore, the step 4 above, after at least one of the opposite ends of the tail pipe 3 and the deposition pipe 5 is heated, and before the tail pipe 3 and the deposition pipe 5 are fused, further includes the following step: expanding the heated end of the tail pipe 3 and the deposition pipe 5 to be expanded, so that the tail pipe 3 and the deposition pipe 5 are better fused.

[0061] Specifically, the step of expanding the heated end of the tail pipe 3 and the deposition pipe 5 to be expanded includes: expanding the heated end of the tail pipe 3 and the deposition pipe 5 to be expanded by the expanding component, so that the diameters of the two ends of the tail pipe 3 and the deposition pipe 5 close to each other are the same.

[0062] In combination Figure 2 , Figure 4 and Figure 5As shown, the step of expanding the heating end of the tail pipe 3 and the deposition pipe 5 to be expanded by the expanding component 100 includes: inserting the top end of the first conical column 15 or the second conical column 16 of the expanding component 100 into the heating end of the tail pipe 3 and / or the deposition pipe 5 to be expanded, so that the heating end to be expanded forms a corresponding expanded end.

[0063] Specifically, when the top end of the first conical column 15 is inserted into the heating end of the tail pipe 3 and / or the deposition pipe 5 to be expanded, the handle 17 is fixed on the first conical column 15 through the first handle clamping slot 18, and at this time, the handle 17 is coaxially arranged with the first conical column 15. When the top end of the second conical column 16 is inserted into the heating end of the tail pipe 3 and / or the deposition pipe 5 to be expanded, the handle 17 is fixed on the second conical column 16 through the second handle clamping slot 19, and at this time, the handle 17 is coaxially arranged with the second conical column 16.

[0064] Wherein, when the expanding operation is performed, at least one of the tail pipe 3 and the deposition pipe 5 to be expanded is uniformly rotated on the deposition lathe, and the heating end of the tail pipe 3 and the deposition pipe 5 to be expanded is heated by the lathe heating torch, and when the heating end of the tail pipe 3 and the deposition pipe 5 to be expanded is in a molten state, the expanding operation is performed to form a uniform and symmetrical expanded end.

[0065] From the perspective of saving process and simplifying process, when the diameters of the tail pipe 3 and the deposition pipe 5 are different, the one with smaller diameter can be expanded. For example, when the diameter of the tail pipe 3 is smaller than the diameter of the deposition pipe 5, the end of the tail pipe 3 close to the deposition pipe 5 is expanded as needed before the tail pipe 3 and the deposition pipe 5 are fused, to form a tail pipe expanded end 4, so that the tail pipe 3 and the deposition pipe 5 are better fused.

[0066] Further, on the basis of the above-mentioned embodiments, the step of fusing the head pipe 1 and the deposition pipe 5 includes: heating at least one of the opposite ends of the head pipe 1 and the deposition pipe 5 to a molten state by the lathe heating torch, and then contacting and fusing the opposite ends of the head pipe 1 and the deposition pipe 5. Wherein, when the fusing operation is performed, the head pipe 1 and the deposition pipe 5 are uniformly rotated on the deposition lathe.

[0067] For example, the head pipe expanded end 2 (or the end of the head pipe 1 close to the deposition pipe 5) is heated by the lathe heating torch, and when the head pipe expanded end 2 (or the end of the head pipe 1 close to the deposition pipe 5) is in a molten state, it is contacted and fused with the deposition pipe 5.

[0068] The step 4, based on the above-mentioned embodiments, the step of welding the tail pipe 3 and the deposition pipe 5 comprises: heating at least one of the opposite ends of the tail pipe 3 and the deposition pipe 5 to a molten state by a lathe heating torch, and then performing contact welding on the opposite ends of the tail pipe 3 and the deposition pipe 5. When the welding operation is performed, the tail pipe 3 and the deposition pipe 5 are uniformly rotated on the deposition lathe.

[0069] For example, the flared end 4 of the tail pipe (or the end of the tail pipe 3 close to the deposition pipe 5) is heated by the lathe heating torch, and when the flared end 4 of the tail pipe (or the end of the tail pipe 3 close to the deposition pipe 5) is in a molten state, the flared end 4 of the tail pipe (or the end of the tail pipe 3 close to the deposition pipe 5) is contact welded with the deposition pipe 5.

[0070] The method for manufacturing the optical fiber core layer provided by the application can avoid the problem of non-concentricity of the deposition pipe, the head pipe and the tail pipe caused by manual operation, can keep the deposition pipe, the head pipe and the tail pipe concentric after being welded, and can make the core layer deposit uniformly, improve the quality of the preform rod, reduce the unqualified rate of the optical fiber and save costs. In addition, the concentric component has the advantages of portability, adjustable height and position, can hold deposition pipes of different specifications, can make the deposition pipe rotate synchronously with the head pipe and the tail pipe, and is convenient for keeping the head pipe, the deposition pipe and the tail pipe concentric during welding. The concentric component can be used when multiple pipes need to be welded concentrically or other concentric operations are involved, and has good adaptability in the process of manufacturing optical fibers.

[0071] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the application, but not to limit them; although the application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement on some technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the application.

Claims

1. A method of making an optical fiber core layer, characterized by, The optical fiber comprises a deposition tube, a head tube and a tail tube, and the preparation method comprises the following steps: Step 1, fixing the head tube and the tail tube at two ends of a deposition lathe respectively by clamps; Step 2, placing the deposition tube between the head tube and the tail tube, and placing a concentric part at a position corresponding to the deposition tube, so that the head tube, the deposition tube and the tail tube are arranged along the same axis by the concentric part; Step 3, heating at least one of opposite ends of the head tube and the deposition tube to fuse the head tube and the deposition tube; Step 4, heating at least one of opposite ends of the tail tube and the deposition tube to fuse the tail tube and the deposition tube; Step 5, after the head tube, the deposition tube and the tail tube are fused, a core layer is formed on the head tube, the deposition tube and the tail tube; In the step 2, the deposition tube is fixed on the deposition lathe by the concentric part, and the concentric part comprises a base, two supports and two half-buckle clamps, the base is installed on the deposition lathe, the two supports are vertically arranged on the base and located at opposite sides of the base respectively, and the two half-buckle clamps are arranged at the top of the two supports respectively, and the deposition tube is clamped on the concentric part by the two half-buckle clamps.

2. The method for preparing the optical fiber core layer according to claim 1, characterized in that, A plurality of grooves with scales are arranged on the base, the grooves extend along the length direction and the width direction of the base, the grooves extending along the length direction and the width direction of the base are arranged in a cross manner, the two supports are slidably installed in the grooves, and the height of the two supports in the vertical direction is adjustable; In the step 2, the step of arranging the head tube, the deposition tube and the tail tube along the same axis by the concentric part comprises: adjusting the positions of the two supports in the grooves to adjust the position of the deposition tube in the horizontal direction relative to the head tube and the tail tube, and / or adjusting the height of the two supports to adjust the position of the deposition tube in the vertical direction relative to the head tube and the tail tube, so that the head tube, the deposition tube and the tail tube are arranged along the same axis.

3. The method of producing an optical fiber core layer according to claim 1 or 2, characterized in that, The two half-buckle clamps are rotatably connected with the two supports respectively, the clamps are rotatably connected with the deposition lathe, the half-buckle clamps are used to drive the deposition tube to rotate and keep the same direction and speed with the clamps.

4. The method of claim 3, wherein the step of heating is performed at a temperature of 1,000°C to 1,500°C. The diameters of the two half-buckle clamps are adjustable, and the inner sides of the two half-buckle clamps are soft contact surfaces.

5. The method of claim 4, wherein the step of applying the coating is performed by a method selected from the group consisting of: dip coating, spin coating, and flow coating. Each half-buckle clamp is composed of two identical half rings, one end of the two half rings is movably connected, and the other end of the two half rings can be locked or opened by a buckle.

6. The method of claim 1, wherein In the step 1, the two clamps clamp and fix the opposite ends of the head tube and the tail tube at two ends of the deposition lathe respectively, and the head tube and the tail tube are arranged along the same axis.

7. The method for preparing the optical fiber core layer according to claim 1, characterized in that, The step 3, after heating at least one of the opposite ends of the head tube and the deposition tube, and before the head tube and the deposition tube are fused, further comprises the following steps: flaring the heated end of the head tube and the deposition tube to be flared; and / or, The step 4, after heating at least one of the opposite ends of the tail tube and the deposition tube, and before the tail tube and the deposition tube are fused, further comprises the following steps: flaring the heated end of the tail tube and the deposition tube to be flared.

8. The method of claim 7, wherein the step of applying the coating is performed by a method selected from the group consisting of: dip coating, spin coating, spray coating, and combinations thereof. In the step 3, when flaring, at least one of the head tube and the deposition tube to be flared rotates at a constant speed on the deposition lathe; when fusing, both the head tube and the deposition tube rotate at a constant speed on the deposition lathe. In the step 4, when flaring, at least one of the tail tube and the deposition tube to be flared rotates at a constant speed on the deposition lathe; when fusing, both the tail tube and the deposition tube rotate at a constant speed on the deposition lathe.

9. The method of producing an optical fiber core layer according to claim 1 or 7, characterized by, In the step 3, the step of fusing the head tube and the deposition tube comprises: heating at least one of the opposite ends of the head tube and the deposition tube to a molten state, and then contacting and fusing the opposite ends of the head tube and the deposition tube. In the step 4, the step of fusing the tail tube and the deposition tube comprises: heating at least one of the opposite ends of the tail tube and the deposition tube to a molten state, and then contacting and fusing the opposite ends of the tail tube and the deposition tube.

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