A high-uniformity optical fiber faceplate, its preparation method and application

Abstract

The present application relates to a kind of high uniformity optical fiber panel and its preparation method and application.The method includes the following steps: by melting core / sheath glass, preparation preform, draw single yarn, arrange primary multifilament rod, draw primary multifilament, arrange secondary multifilament rod, draw secondary multifilament and arrange plate, obtain optical fiber bundle;The optical fiber bundle is placed in fusion pressure environment and is heated, aerated, so that the secondary multifilament in different positions is heated uniformly;The fusion pressure environment is vacuumized, so that its vacuum degree is less than 10Pa;The fusion pressure environment is pressurized, and the scale is pressed to 1mm-500mm, so that the secondary multifilament in optical fiber bundle is fused into one;After the fusion pressure environment is cooled to below 100 DEG C, the optical fiber bundle is demolded, subsequent processing, and the optical fiber panel is obtained.The present application passes inert gas into fusion pressure environment, so that high-temperature gas passes through the surface of secondary multifilament, realizes the heating consistency of secondary multifilament in different positions, shortens the high-temperature time of fusion pressure, and improves the performance consistency of different positions of optical fiber panel.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of optical fiber, in particular to a high-uniform optical fiber panel and a preparation method and application thereof. BACKGROUND

[0002] Optical fiber panel (referred to as optical fiber panel) is formed by millions of micron-level optical fibers arranged regularly and fused. Each optical fiber is composed of a high-refractive core and a low-refractive cladding. Light is transmitted in the optical fiber according to the principle of total reflection. The optical fiber panel has the characteristics of high resolution, large numerical aperture and optical zero thickness, and can realize high-fidelity transmission of optical images. The optical fiber panel is widely used in micro-light image intensifiers, high-brightness high-definition displays, photoelectric couplings (CCD, CMOS) and other high-definition image receiving, transmitting and coupling instruments and equipment.

[0003] The preparation process of the optical fiber panel includes single-fiber drawing, primary multifilament rod arrangement, primary multifilament drawing, secondary multifilament rod arrangement, secondary multifilament drawing, panel arrangement, fusion pressing and cold processing. The fusion pressing process is to heat the arranged secondary multifilaments and apply pressure to the periphery of the secondary multifilaments, so that the secondary multifilaments are fused to form an integral structure. In the fusion pressing process, as the size of the optical fiber panel increases, the time for the inner and outer secondary multifilaments to reach thermal equilibrium increases, and the fusion pressing time is prolonged. Due to the difference in thermal processes between the inner and outer secondary multifilaments, the performance of the optical fiber panel after fusion pressing is different. At the same time, a long high-temperature time also causes serious core-cladding diffusion, material crystallization and low production efficiency. The current method to solve the uniformity of the optical fiber panel in the fusion pressing process is to slowly increase the temperature and prolong the holding time, so as to achieve thermal equilibrium through heat transfer between the fibers. This method has a certain effect on small-size optical fiber panels. However, for large-size optical fiber panels, a longer time is needed to reach thermal equilibrium. The longer the time, the more likely the fibers are to crystallize, and the more likely the core-cladding is to diffuse, resulting in defects such as dark spots and resolution reduction. At the same time, due to the heat transfer process of the fiber fusion pressing process, the mold first transfers heat to the outer filaments of the panel segment through heat conduction. When the heat is gradually transferred from the outer filaments to the inner filaments, the glass has poor thermal conductivity, and the heat transfer takes a long time. When the thermal equilibrium is reached, the high-temperature time of the outer filaments is much longer than that of the inner filaments, making the outer filaments more likely to crystallize and the core-cladding more likely to diffuse, which is inconsistent with the inner filaments, resulting in uneven heating of the entire optical fiber panel. SUMMARY

[0004] Therefore, the main purpose of the present application is to provide a high-uniform optical fiber panel and a preparation method and application thereof. The technical problem to be solved is to uniformly heat the secondary multifilaments at different positions by introducing inert gas into the fusion pressing environment, so as to shorten the high-temperature time of fusion pressing, and thus improve the performance consistency of the optical fiber panel at different positions and improve the production efficiency.

[0005] The technical problems and solutions of the present application are realized by the following technical solutions. The present application provides a preparation method of a high-uniformity optical fiber panel, comprising the following steps:

[0006] Step one, obtaining an optical fiber bundle by melting core / cover glass, preparing a preform rod, drawing a single filament, arranging a primary multifilament rod, drawing a primary multifilament, arranging a secondary multifilament rod, drawing a secondary multifilament, and arranging a plate;

[0007] Step two, placing the optical fiber bundle in a fusion pressure environment and heating and inflating, the gas is preheated and blown to one end of the optical fiber bundle, and then the gas transmits heat to the secondary multifilament when passing through the boundary of the secondary multifilament, so that the secondary multifilaments at different positions are uniformly heated; the gas is an inert gas;

[0008] Step three, vacuumizing the fusion pressure environment to make the vacuum degree less than 10 Pa;

[0009] Step four, pressurizing the fusion pressure environment, and setting the lower pressure scale to 1 mm-500 mm, so that the secondary multifilaments in the optical fiber bundle are fused into one;

[0010] Step five, cooling the fusion pressure environment to below 100℃, and then demolding and subsequent processing the optical fiber bundle to obtain the optical fiber panel.

[0011] The technical problems and solutions of the present application are further realized by the following technical solutions.

[0012] As a preferred, the aforementioned preparation method of a high-uniformity optical fiber panel, wherein in step one, the core glass is boron lanthanum barium glass; the cover glass is boron silicon glass; and the optical fiber bundle is a quadrangular prism, a hexagonal prism, an octagonal prism, a decagonal prism, or a dodecagonal prism, and the opposite side size is 20 mm-2000 mm.

[0013] As a preferred, the aforementioned preparation method of a high-uniformity optical fiber panel, wherein in step two, the heating temperature is 450℃-750℃.

[0014] As a preferred, the aforementioned preparation method of a high-uniformity optical fiber panel, wherein in step two, the inert gas is He, Ar, or N2; and the flow rate of the inert gas is 0.01-100 L / min.

[0015] As a preferred, the aforementioned preparation method of a high-uniformity optical fiber panel, wherein in step two, the preheating temperature is consistent with the temperature in the fusion pressure environment, so that the heating temperature of the optical fiber bundle is consistent.

[0016] As preferred, the preparation method of the high-uniformity optical fiber panel, wherein in step five, the subsequent processing comprises over-rolling into a cylinder with a diameter of 10-100mm by an over-rolling machine, further cutting into a cylinder with a height of 3-100mm by an inner circle cutting machine, and polishing by a polishing machine.

[0017] The object and the solution to the technical problem of the present application can also be further realized by the following technical measures. The present application provides a high-uniformity optical fiber panel prepared by any of the above-mentioned methods.

[0018] As preferred, the high-uniformity optical fiber panel, wherein the transmittance difference of different positions of the high-uniformity optical fiber panel is less than or equal to 0.1% at a wavelength of 400-1000nm.

[0019] As preferred, the high-uniformity optical fiber panel, wherein the resolution difference of different positions of the high-uniformity optical fiber panel is less than or equal to 1lp / mm.

[0020] The object and the solution to the technical problem of the present application can also be further realized by the following technical measures. The present application provides a micro-light image intensifier using the high-uniformity optical fiber panel.

[0021] The object and the solution to the technical problem of the present application can also be further realized by the following technical measures. The present application provides a high-brightness high-definition display using the high-uniformity optical fiber panel.

[0022] The object and the solution to the technical problem of the present application can also be further realized by the following technical measures. The present application provides an optoelectronic coupler using the high-uniformity optical fiber panel.

[0023] The present application introduces high-temperature gas into the gap between the secondary multifilaments of the optical fiber panel for heating, so that the secondary multifilaments of the optical fiber panel are heated simultaneously in the fusion pressing process, and the heating is uniform, avoiding the inconsistent heating of the inside and outside of the optical fiber panel caused by the heating by heat conduction in the traditional process.

[0024] Compared with the prior art, the high-uniformity optical fiber panel, the preparation method and the application thereof have the following beneficial effects:

[0025] (1) The present application introduces inert gas into the fusion pressing environment, so that the high-temperature gas passes through the surface of the secondary multifilaments, realizing uniform heating of the secondary multifilaments at different positions, shortening the high-temperature time of fusion pressing, improving the performance consistency of the optical fiber panel at different positions, and improving the production efficiency.

[0026] (2) The application can be applied to process optical fiber panels of various specifications, improve the uniformity of transmittance of different positions of the optical fiber panel, the transmittance difference of different positions is less than 0.1% when the wavelength is 400-1000nm, improve the resolution consistency of different positions of the optical fiber panel, the resolution difference of different positions is less than 1lp / mm, and reduce the dark spot defects of the optical fiber panel.

[0027] The above description is only a summary of the technical solutions of the application. In order to make the technical means of the application more clearly understood, and to be implemented according to the content of the description, the following will be described in detail with the preferred embodiments of the application. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 The preparation method process flow chart of the high-uniform optical fiber panel of the embodiment of the application;

[0029] Figure 2 The structure schematic diagram of the vertical pressing mold of the embodiment of the application;

[0030] Figure 3 The structure schematic diagram of the horizontal pressing mold of the embodiment of the application;

[0031] Figure 4 The air path diagram of the embodiment of the application. DETAILED DESCRIPTION

[0032] In order to further illustrate the technical means and effects taken by the application to achieve the predetermined purposes, the following will be described in detail with the preferred embodiments, the specific implementation, structure, features and effects of the high-uniform optical fiber panel, the preparation method and application thereof according to the application, as follows. In the following description, different "an embodiment" or "embodiments" do not necessarily refer to the same embodiment. In addition, the specific features, structures or characteristics in one or more embodiments can be combined in any suitable form.

[0033] The application will be further described below in conjunction with specific embodiments, but it should not be understood as limiting the scope of protection of the application. Some non-essential improvements and adjustments of the application made by the person skilled in the art according to the above content of the application still belong to the protection scope of the application.

[0034] In the following embodiments of the application, unless otherwise specified, the materials, reagents and the like involved are commercially available goods well known by those skilled in the art; unless otherwise specified, the methods described are the methods well known in the art. Unless otherwise defined, the technical terms or scientific terms used should be the usual meanings understood by those skilled in the art in the field of the application.

[0035] As Figure 1As shown, some embodiments of the present application provide a method for preparing a high-uniformity optical fiber panel, comprising the following steps:

[0036] Step S1, preparing an optical fiber bundle:

[0037] (1) melting a core glass rod with an outer diameter of 10-100 mm and a length of 300-5000 mm, melting a skin glass tube with an inner diameter of 11-105 mm, a wall thickness of 1-10 mm, and a length of 300-5000 mm, and sleeving the core glass rod into the skin glass tube to prepare an optical fiber preform rod. If the outer diameter of the core glass rod is less than 10 mm, the production efficiency is low; if the outer diameter of the core glass rod is greater than 100 mm, it is limited by equipment. If the length of the core glass rod is less than 300 mm, the production efficiency is low; if the length of the core glass rod is greater than 5000 mm, it is limited by equipment. If the inner diameter of the skin glass tube is less than 11 mm, the production efficiency is low; if the inner diameter of the skin glass tube is greater than 105 mm, it is limited by equipment. If the wall thickness of the skin glass tube is less than 1 mm, the production efficiency is low; if the wall thickness of the skin glass tube is greater than 10 mm, it is limited by equipment. If the length of the skin glass tube is less than 300 mm, the production efficiency is low; if the length of the skin glass tube is greater than 5000 mm, it is limited by equipment.

[0038] (2) placing the optical fiber preform rod into a drawing furnace for drawing to form a single yarn with a yarn diameter of 1-10 mm and a length of 300-5000 mm. If the yarn diameter of the single yarn is less than 1 mm, the production efficiency is low; if the yarn diameter of the single yarn is greater than 10 mm, it is limited by equipment. If the length of the single yarn is less than 300 mm, the production efficiency is low; if the length of the single yarn is greater than 5000 mm, it is limited by equipment. The drawing temperature is 700-1100°C, which is determined by the viscosity of the glass. If the temperature is less than 700°C, the glass viscosity is too high and the yarn cannot be drawn. If the temperature is greater than 1100°C, the yarn viscosity is too low and the yarn diameter cannot be controlled.

[0039] (3) arranging the single yarns into a regular hexagon with 2-15 single yarns per side to form a primary multifilament rod, which is a regular hexagonal prism with an opposite side length of 10-75 mm and a length of 300-5000 mm. If the number of single yarns is less than 2, the production efficiency is low; if the number of single yarns is greater than 15, it is limited by equipment. If the opposite side length of the primary multifilament rod is less than 10 mm, the production efficiency is low; if the opposite side length of the primary multifilament rod is greater than 75 mm, it is limited by equipment. If the length of the primary multifilament rod is less than 300 mm, the production efficiency is low; if the length of the primary multifilament rod is greater than 5000 mm, it is limited by equipment.

[0040] (4) The primary multifilament rod is placed in a drawing furnace for drawing to produce primary multifilaments with a diameter of 1–10 mm and a length of 300–5000 mm. If the diameter of the primary multifilament is less than 1 mm, the production efficiency is low; if the diameter is greater than 10 mm, it is limited by the equipment. If the length of the primary multifilament is less than 300 mm, the production efficiency is low; if the length is greater than 5000 mm, it is limited by the equipment. The drawing temperature is 700℃–1100℃, and the drawing temperature is determined by the viscosity of the glass. If the temperature is less than 700℃, the glass viscosity is too high, and the wire cannot be drawn. If the temperature is greater than 1100℃, the wire viscosity is too low, and the wire diameter cannot be controlled.

[0041] (5) Arrange the primary multifilaments into a regular hexagon, with 2 to 50 fibers on each side, to form a secondary multifilament rod, which is a regular hexagonal prism with opposite sides of 10 to 75 mm and a length of 300 to 5000 mm. If the number of primary multifilaments is less than 2, the production efficiency is low; if the number of primary multifilaments is greater than 15, it is limited by the equipment. If the opposite sides of the secondary multifilament rod are less than 10 mm, the production efficiency is low; if the opposite sides of the secondary multifilament rod are greater than 75 mm, it is limited by the equipment. If the length of the secondary multifilament rod is less than 300 mm, the production efficiency is low; if the length of the secondary multifilament rod is greater than 5000 mm, it is limited by the equipment.

[0042] (6) The secondary multifilament rod is placed in a drawing furnace for drawing to produce secondary multifilaments with a diameter of 1-10 mm and a length of 300-5000 mm. If the diameter of the secondary multifilament is less than 1 mm, the production efficiency is low; if the diameter is greater than 10 mm, it is limited by the equipment. If the length of the secondary multifilament is less than 300 mm, the production efficiency is low; if the length is greater than 5000 mm, it is limited by the equipment.

[0043] (7) Arrangement: Cut the secondary multifilament into small segments and arrange them into regular hexagonal prisms with a length of 30-500mm and an opposite side length of 15-500mm. The specific dimensions are determined according to the application requirements. If the length of the small segment is less than 30mm and the opposite side is less than 15mm, it is too short and the efficiency is low; if the length of the small segment is greater than 500mm and the opposite side is less than 15mm, it is too large and the equipment is limited.

[0044] Step S2, Mold assembly oven: Place the fiber bundle in Figure 2 The vertical pressing mold shown or Figure 3 In the horizontal pressing die shown; from Figure 2As can be seen from the vertical pressure die, the vertical pressure die comprises a cover 1, a die sleeve 2, a slider 3, a pressure ring 4 and a base 5, the cover 1 is placed on the pressure ring 4, the base 5 is fixed on the die sleeve 2 by screws, the slider 3 is arranged between the pressure ring 4 and the base 5, the center of the cover 1 is welded with an air outlet pipe, and the air outlet pipe passes through the center of the cover 1, the air outlet pipe has an air outlet hole 6 at the end away from the cover 1, the die sleeve 2 and the base 5 are welded with an air inlet pipe at the center, and the air inlet pipe passes through the center of the die sleeve 2 and the base 5, the air inlet pipe has an air inlet hole 7 at the end away from the cover 1; when the vertical pressure die is pressurized, the pressure is transmitted to the cover 1, the cover 1 is transmitted to the pressure ring 4, when the pressure ring 4 moves downward, the six sliders move towards the center, and the optical fiber panel is extruded; the pressure is applied to the vertical pressure die by the press, specifically, the press applies pressure to the cover of the vertical pressure die, and the force is transmitted to the optical fiber panel through each component of the vertical pressure die; from Figure 3 As can be seen from the horizontal pressure die, the horizontal pressure die comprises an upper slider 8, a middle slider 9, a lower slider 10, a side strip 11, an upper baffle 12 and a lower baffle 13; the upper baffle 12 is placed on the lower baffle 13, the upper baffle 12 is sequentially placed with the lower slider 10, the lower optical fiber panel, the middle slider 9, the upper optical fiber panel and the upper slider 8, the side strips 11 are arranged on both sides of the lower optical fiber panel and the upper optical fiber panel respectively, the upper baffle 12 and the lower baffle 13 are respectively welded with an air inlet pipe and an air outlet pipe at the positions opposite to the lower optical fiber panel and the upper optical fiber panel, and the air inlet pipe and the air outlet pipe respectively pass through the upper baffle 12 and the lower baffle 13, the air inlet pipe has an air inlet hole 14 at the end away from the upper baffle 12, and the air outlet pipe has an air outlet hole 15 at the end away from the lower baffle 13. When the horizontal pressure die is pressurized, the pressure is transmitted to the upper slider 8, the upper slider 8 transmits the pressure to the middle slider 9 by extruding the side strip 11 and the upper optical fiber panel, and the middle slider 9 transmits the pressure to the lower slider by extruding the side strip 11 and the lower optical fiber panel. The horizontal pressure die has two air holes corresponding to the two ends of the optical fiber bundle, one is an air inlet hole and the other is an air outlet hole; there can be more air holes, which are not limited, and the purpose of the air holes is to pass the high-temperature gas into the gap between the multifilament of the optical fiber panel. Then the horizontal pressure die with the optical fiber bundle is placed in the horizontal pressure furnace.

[0045] Step S3, temperature rise and inflation: the horizontal pressure furnace and the preheating furnace are simultaneously heated, and the furnace temperature is uniformly raised to 450-750℃. Open the air inlet hole 7 and the air outlet hole 6 of the horizontal pressure die, and open the high-pressure gas cylinder 16. As shown in Figure 4 The high-pressure gas cylinder 16 contains inert gas, which is first preheated in the preheating furnace 17, then enters the horizontal pressure furnace 18 for secondary preheating, and then enters the horizontal pressure die 19 through the air inlet hole 20. After the gas is preheated, it is consistent with the furnace temperature, blows to one end of the optical fiber bundle, and then is discharged from the air outlet hole 21. When the gas passes through the secondary multifilament boundary of the optical fiber bundle, it transmits heat to the secondary multifilament, so that the secondary multifilament at different positions is uniformly heated.

[0046] Step S4, vacuumizing: closing the high-pressure cylinder, the air inlet hole, and the air outlet hole, and vacuumizing the furnace to a vacuum degree less than 10 Pa; the closing can be achieved by screwing the valve of the high-pressure cylinder or by adding a gas valve in the air path (only the high-pressure cylinder is closed, and the air inlet hole and the air outlet hole are not closed). The vacuumizing of the furnace is to remove the gas between the fibers and to prepare for the fusion pressing process.

[0047] Step S5, pressurizing: pressurizing the fusion pressing mold, and pressing to a scale of 1 mm to 500 mm to fuse the secondary filaments in the optical fiber bundle together; specifically, the fusion pressing mold is pressurized by an automatic presser, the pressure is gradually increased from 1 MPa to 10 MPa, and each increase of 1 MPa to 10 MPa is kept for 1 min to 3 min until the target pressing scale of 1 mm to 500 mm is reached. If the pressure is increased by more than 10 MPa each time, the increase of the pressure is too large each time, and the plate segment is prone to distortion; if the pressure is increased by less than 1 MPa each time, the increase of the pressure is too small each time, and the production efficiency is low; if the keeping time is less than 1 min, the keeping time is too short, and the fusion of the plate segment is not in place; if the keeping time is more than 3 min, the keeping time is too long, and the efficiency is low.

[0048] Step S6, furnace outlet, demolding, and processing: taking the fusion pressing mold out of the furnace and placing it in a heat preservation box to cool to below 100°C; if the temperature is higher than 100°C, the temperature is too high, and the plate segment is prone to burst after demolding; after the fusion pressing mold is cooled, the optical fiber bundle is taken out of the mold to obtain an optical fiber panel blank, which is convenient to operate and avoids burst of the optical fiber panel; the optical fiber panel blank is processed to obtain the optical fiber panel.

[0049] In some embodiments, optionally, in step S1, the core glass can be a high-refractive glass, such as H-LaK3 glass; the skin glass can be a low-refractive glass, such as K9 glass; and the optical fiber bundle can be a quadrangular prism, a hexagonal prism, an octagonal prism, a decagonal prism, or a dodecagonal prism, with a side size of 20 mm to 2000 mm. Considering the convenience of plate arrangement and fusion pressing, the optical fiber bundle is generally selected to be a hexagonal prism or an octagonal prism. If the side size is less than 20 mm, the efficiency is low; and if the side size is greater than 2000 mm, the equipment is limited.

[0050] In some embodiments, optionally, in step S2, the fusion pressing mold is a vertical pressing mold as shown in FIG. 1 or a horizontal pressing mold as shown in FIG. 2. Figure 2 Figure 3 ​The shown horizontal pressing mold. The melt pressing mold is a mold for melt pressing the optical beam, and the optical fiber bundle is extruded at high temperature to fuse and form an integrated body. The vertical pressing mold and the horizontal pressing mold are two types of molds, vertical pressing refers to the vertical placement of the plate segment, horizontal pressing refers to the horizontal placement of the plate segment, the vertical pressing mold is uniformly stressed when pressing, but the production efficiency is low, and only one plate segment can be placed at a time; the horizontal pressing mold can place four plate segments at a time, but the stress on the plate segment is uneven.

[0051] In some embodiments, optionally, in step S2, the upper and lower ends of the vertical pressing mold have air vents; the left and right ends of the horizontal pressing mold have air vents, and the gas enters from the air inlet hole and is discharged from the air outlet hole. The purpose of such arrangement is to allow high-temperature gas to pass through the surface of the multifilament in the optical fiber bundle to transfer heat to the internal multifilament, so that the internal and external multifilaments are uniformly heated.

[0052] In some embodiments, optionally, in step S3, the temperature rising rate is 5-15℃ / min; if the temperature is lower than 5℃ / min, the production efficiency is low; if the temperature is higher than 15℃ / min, the equipment is limited. The preheating temperature is consistent with the furnace temperature, and the difference between the preheating temperature and the furnace temperature is less than ±10℃, which can ensure that the mold temperature is consistent with the plate segment temperature, the heating is uniform, and the fiber temperature is uniformly heated.

[0053] In some embodiments, optionally, in step S3, the flow rate of the inert gas is 0.01-100L / min, and the inert gas can be He, Ar, N2, etc., which only plays a heat transfer role and does not react with the fiber. The inert gas is filled after the plate segment is placed into the furnace, and the filling temperature is always consistent with the furnace temperature, and the purpose is to make the internal and external temperatures of the optical fiber panel consistent. From the beginning of entering the furnace, the gas is filled until the mold is pressed, and then the gas filling is stopped, because the fiber needs to be fused together after the melt pressing starts, which is an exhaust process, and the fiber fusion is not conducive to the fiber fusion.

[0054] In some embodiments, optionally, in step S6, the subsequent processing includes: first, rolling into a cylinder with a diameter of 10-100mm through a rolling machine, second, further cutting into a cylinder with a height of 3-100mm through an inner circle cutting machine, and then polishing through a polishing machine, and after polishing, there is no scratch under 8 times magnification.

[0055] Some embodiments of the present application also provide a high-uniform optical fiber panel, which is prepared by any of the above-mentioned methods; the transmittance difference of the high-uniform optical fiber panel at different positions is less than or equal to 0.1% when the wavelength is 400-1000nm; and the resolution difference of the high-uniform optical fiber panel at different positions is less than or equal to 1lp / mm, so as to improve the resolution consistency of the optical fiber panel at different positions and reduce the dark spot defects of the optical fiber panel.

[0056] The high uniformity refers to that the transmittance difference of the optical fiber panel at different positions is less than or equal to 0.1% at a wavelength of 400-1000 nm, and the resolution difference at different positions is less than or equal to 1 lp / mm.

[0057] Some embodiments of the present application also provide a micro-light image intensifier using the high-uniform optical fiber panel.

[0058] Some embodiments of the present application also provide a high-brightness high-definition display using the high-uniform optical fiber panel.

[0059] Some embodiments of the present application also provide an optoelectronic coupler using the high-uniform optical fiber panel.

[0060] Mechanism: The present application uses high-temperature airflow to transfer heat in the gap between fibers, so that the fibers at different positions of the optical fiber panel are uniformly heated, avoiding the inconsistent heating caused by the heat conduction from the outer fibers to the inner fibers in the traditional process, and various defects caused thereby.

[0061] The present application is further described below in conjunction with specific embodiments.

[0062] The test process of the transmittance difference at different positions and the resolution difference at different positions of the optical fiber panel in Examples 1-5 and Comparative Examples 1-2 is as follows: five points are taken from the center to the edge position of the optical fiber panel of Example 1, Example 2, Example 3, Example 4, Comparative Example 1 or Comparative Example 2, and the transmittance and resolution of the five points at a wavelength of 400-1000 nm are tested,

[0063] Then, the absolute value of the transmittance difference or the absolute value of the resolution difference of any two points selected from the five points is obtained.

[0064] Example 1

[0065] The present embodiment provides a preparation method of a high-uniform optical fiber panel, comprising the following steps:

[0066] Step S1, preparing a fiber bundle:

[0067] (1) A core glass rod (glass brand H-LaK3) with an outer diameter of 29 mm and a length of 1000 mm is fused, and a skin glass tube (glass brand H-K9) with an inner diameter of 30 mm, a wall thickness of 2 mm and a length of 1000 mm is fused, the core glass rod is sleeved into the skin glass tube to prepare a fiber preform rod.

[0068] (2) Put the optical fiber preform into the drawing furnace to draw the single fiber with a diameter of 2 mm and a length of 1000 mm at 900℃.

[0069] (3) Arrange the single fibers into a regular hexagon with 6 single fibers on each side to form a primary multifilament rod, which is a regular hexagonal prism with a side length of 30 mm and a length of 1000 mm.

[0070] (4) Put the primary multifilament rod into the drawing furnace to draw the primary multifilament with a diameter of 1 mm and a length of 1000 mm.

[0071] (5) Arrange the primary multifilament into a regular hexagon with 13 multifilaments on each side to form a secondary multifilament rod, which is a regular hexagonal prism with a side length of 30 mm and a length of 1000 mm.

[0072] (6) Put the secondary multifilament rod into the drawing furnace to draw the secondary multifilament with a diameter of 1 mm and a length of 1000 mm at 900℃.

[0073] (7) Board arrangement: cut the secondary multifilament into 300 mm and arrange it into a regular hexagonal prism with a side length of 50 mm.

[0074] Step S2, mold loading and furnace loading: place the optical fiber bundle in the vertical pressing mold as shown in the figure, the upper and lower ends of the vertical pressing mold have two air holes, the lower end is the air inlet hole, and the upper end is the air outlet hole. Put the mold loaded with the optical fiber bundle into the fusion pressing furnace. Figure 2

[0075] Step S3, temperature rise and air charging: raise the furnace temperature to 620℃, and at the same time, introduce 620℃ preheated He into the air inlet of the fusion pressing mold (flow rate is 1L / min, introduced for 180min before pressurizing by the conventional hydraulic press), and discharge through the air outlet. The introduced He is preheated by the preheating furnace, as shown in the figure. Figure 4

[0076] Step S4, vacuumizing: stop introducing He, and vacuumize the furnace to a vacuum degree of 10Pa.

[0077] Step S5, pressurizing: pressurize the vertical pressing mold, and press the secondary multifilaments in the optical fiber bundle to 6mm (the whole stroke is 6mm) to fuse them together.

[0078] ​​Step S6, furnace discharge, demolding and processing: the vertical compression mold is taken out from the furnace and placed in a heat preservation box to cool to room temperature. The vertical compression mold is taken out from the furnace and demolded to obtain a fiber panel blank. The fiber panel blank after fusion compression is subjected to subsequent processing to obtain a fiber panel finished product. The subsequent processing includes: rolling into a cylinder with a diameter of 45 mm by a rolling machine, further cutting into a cylinder with a height of 15 mm by an inner circle cutting machine, polishing by a polishing machine, and no scratches under 8 times magnification.

[0079] In this embodiment, He is introduced for heating the secondary multifilament, so that the fiber panel is uniformly heated inside and outside, the performance uniformity of the fiber panel is improved, and the fusion compression process time is reduced. The maximum difference in transmittance at different positions of the fiber panel prepared in this embodiment is 0.07% at a wavelength of 400-1000 nm, and the maximum difference in resolution at different positions is 11 p / mm.

[0080] Embodiment 2

[0081] The embodiment provides a preparation method of a high-uniformity fiber panel, including the following steps:

[0082] Step S1, preparation of a fiber bundle:

[0083] (1) a core glass rod (glass brand H-LaK3) is fused, with an outer diameter of 29 mm and a length of 1000 mm; a skin glass tube (glass brand H-K9) is fused, with an inner diameter of 30 mm, a wall thickness of 2 mm and a length of 1000 mm; the core glass rod is sleeved into the skin glass tube to prepare a fiber preform rod.

[0084] (2) the fiber preform rod is placed in a drawing furnace to draw a single filament with a filament diameter of 2 mm and a length of 1000 mm at 900°C.

[0085] (3) the single filaments are arranged into a regular hexagon, with 6 single filaments on each side, to form a primary multifilament rod, which is a regular hexagonal prism, with an opposite side length of 30 mm and a length of 1000 mm.

[0086] (4) the primary multifilament rod is placed in a drawing furnace to draw a primary multifilament with a filament diameter of 1 mm and a length of 1000 mm.

[0087] (5) the primary multifilament is arranged into a regular hexagon, with 13 primary multifilaments on each side, to form a secondary multifilament rod, which is a regular hexagonal prism, with an opposite side length of 30 mm and a length of 1000 mm.

[0088] (6) the secondary multifilament rod is placed in a drawing furnace to draw a secondary multifilament with a filament diameter of 1 mm and a length of 1000 mm at 900°C.

[0089] (7) Arranging: cutting the secondary filaments into 300 mm, and arranging into regular hexagonal prism with 50 mm side length.

[0090] Step S2, mold loading and furnace loading: placing the fiber bundle in the cross-pressing mold shown in FIG. 2, and the left and right ends of the cross-pressing mold have two air holes, one end of which is an air inlet hole, and the other end is an air outlet hole. The cross-pressing mold loaded with the fiber bundle is placed into the fusion pressing furnace. Figure 3

[0091] Step S3, temperature rising and air charging: the furnace is heated to 620°C, and the air inlet hole end of the cross-pressing mold is supplied with 620°C preheated He (flow rate is 1 L / min, and the He is supplied for 180 min before the cross-pressing mold is pressed by the conventional hydraulic press), and the air is discharged through the air outlet hole end.

[0092] Step S4, vacuumizing: stopping the supply of He, and vacuumizing the furnace to a vacuum degree of 10 Pa.

[0093] Step S5, pressurizing: the cross-pressing mold is pressurized, and the press scale is 6 mm (the whole stroke is 6 mm), and the secondary filaments in the fiber bundle are fused together.

[0094] Step S6, furnace discharging, demolding, and processing: the cross-pressing mold is taken out of the furnace and placed into a heat preservation box to cool to room temperature. The cross-pressing mold is taken out of the heat preservation box, demolded to obtain a fiber panel blank. The fusion-pressed fiber panel blank is subjected to subsequent processing to obtain a fiber panel product. The subsequent processing includes: being rolled into a cylinder with a diameter of 45 mm by a rolling machine, being further cut into a cylinder with a height of 15 mm by an inner circle cutting machine, and being polished by a polishing machine, and no scratch is observed under 8 times magnification.

[0095] In this embodiment, He is supplied to heat the secondary filaments, so that the fiber panel is uniformly heated inside and outside, the performance uniformity of the fiber panel is improved, and the fusion pressing process time is reduced. The maximum difference in transmittance of the fiber panel prepared in this embodiment at different positions in the wavelength range of 400-1000 nm is 0.07%, and the maximum difference in resolution at different positions is 11 p / mm.

[0096] Example 3

[0097] The embodiment provides a preparation method of a high-uniformity fiber panel, and the method comprises the following steps:

[0098] Step S1, preparing a fiber bundle:

[0099] (1) melting a core glass rod (glass brand H-LaK3) with an outer diameter of 29 mm and a length of 1000 mm, and melting a skin glass tube (glass brand H-K9) with an inner diameter of 30 mm, a wall thickness of 2 mm, and a length of 1000 mm, and sleeving the core glass rod into the skin glass tube to prepare a fiber preform rod. ​

[0100] (2) Put the optical fiber preform into the drawing furnace to draw a single fiber with a diameter of 2 mm and a length of 1000 mm at 900℃.

[0101] (3) Arrange the single fibers into a regular hexagon with 6 single fibers on each side to form a primary multifilament rod, which is a regular hexagonal prism with an edge length of 30 mm and a length of 1000 mm.

[0102] (4) Put the primary multifilament rod into the drawing furnace to draw a primary multifilament with a diameter of 1 mm and a length of 1000 mm.

[0103] (5) Arrange the primary multifilaments into a regular hexagon with 13 primary multifilaments on each side to form a secondary multifilament rod, which is a regular hexagonal prism with an edge length of 30 mm and a length of 1000 mm.

[0104] (6) Put the secondary multifilament rod into the drawing furnace to draw a secondary multifilament with a diameter of 1 mm and a length of 1000 mm.

[0105] (7) Board arrangement: cut the secondary multifilaments into 300 mm and arrange them into a regular hexagonal prism with an edge length of 30 mm.

[0106] Step S2, mold loading and furnace loading: place the optical fiber bundle in the cross-pressure mold shown in FIG. 1, and the left and right ends of the cross-pressure mold have two air holes, one end of which is an air inlet hole and the other end is an air outlet hole. Put the cross-pressure mold loaded with the optical fiber bundle into the fusion pressure furnace chamber. Figure 3 Step S3, temperature rise and air charging: raise the furnace chamber to 620℃, and at the same time, introduce 620℃ preheated Ar (flow rate of 0.5 L / min, 180 min) into the air inlet hole end of the cross-pressure mold and discharge it through the air outlet hole end.

[0107] Step S4, vacuumizing: stop the introduction of Ar, and vacuumize the furnace chamber to a vacuum degree of 10 Pa.

[0108] Step S5, pressurizing: pressurize the cross-pressure mold, with a lower pressure scale of 6 mm (the entire stroke is 6 mm), and the secondary multifilaments in the optical fiber bundle are fused together.

[0109] Step S6, furnace discharge, demolding, and processing: take the cross-pressure mold out of the furnace chamber and place it in a heat preservation box to cool to room temperature. Take the cross-pressure mold out of the heat preservation box, demold to obtain an optical fiber panel blank. Perform subsequent processing on the fusion-pressed optical fiber panel blank to obtain an optical fiber panel finished product. The subsequent processing includes: rolling into a cylinder with a diameter of 25 mm by a rolling machine, further cutting into a cylinder with a height of 15 mm by an inner circle cutting machine, and polishing by a polishing machine, and no scratches are observed under 8 times magnification.

[0110]

[0111] ​The embodiment is heated by Ar, the secondary multifilament is arranged, the optical fiber panel is heated uniformly, the performance uniformity of the optical fiber panel is improved, and the fusion pressure process time is reduced. The prepared optical fiber panel has a maximum difference of 0.08% in transmittance at different positions and a maximum difference of 11 p / mm in resolution at different positions when the wavelength is 400-1000 nm.

[0112] Embodiment 4

[0113] The embodiment provides a preparation method of a high-uniformity optical fiber panel, and the method comprises the following steps:

[0114] Step S1, preparing an optical fiber bundle:

[0115] (1) a core glass rod (glass brand H-LaK3) is fused, the outer diameter is 29 mm, and the length is 1000 mm; a skin glass tube (glass brand H-K9) is fused, the inner diameter is 30 mm, the wall thickness is 2 mm, and the length is 1000 mm; the core glass rod is sleeved into the skin glass tube to prepare an optical fiber preform rod.

[0116] (2) the optical fiber preform rod is placed into a drawing furnace to draw a single filament with a filament diameter of 2 mm and a length of 1000 mm at 900 DEG C.

[0117] (3) the single filaments are arranged into a regular hexagon, 6 single filaments are arranged on each side, a primary multifilament rod is formed, the primary multifilament rod is a regular hexagonal prism, the opposite side length is 30 mm, and the length is 1000 mm.

[0118] (4) the primary multifilament rod is placed into a drawing furnace to draw a primary multifilament with a filament diameter of 1 mm and a length of 1000 mm.

[0119] (5) the primary multifilaments are arranged into a regular hexagon, 13 primary multifilaments are arranged on each side, a secondary multifilament rod is formed, the secondary multifilament rod is a regular hexagonal prism, the opposite side length is 30 mm, and the length is 1000 mm.

[0120] (6) the secondary multifilament rod is placed into a drawing furnace to draw a secondary multifilament with a filament diameter of 1 mm and a length of 1000 mm.

[0121] (7) arranging a plate: the secondary multifilament is cut into 300 mm and arranged into a regular hexagonal prism with an opposite side of 30 mm.

[0122] Step S2, mold loading and furnace loading: the optical fiber bundle is placed into a horizontal pressure mold shown in the figure, and the left and right ends of the horizontal pressure mold have two air holes, one end is an air inlet hole, and the other end is an air outlet hole. The horizontal pressure mold loaded with the optical fiber bundle is placed into a fusion pressure furnace. Figure 3

[0123] ​Step S3, temperature rising and gas filling: the furnace is heated to 630℃, while the Ar preheated to 630℃ is introduced into the end of the gas inlet hole of the horizontal pressing mold (flow rate is 0.5 L / min, 180 min), and the Ar is discharged through the end of the gas outlet hole.

[0124] Step S4, vacuumizing: stop introducing the Ar, and vacuumize the furnace, the vacuum degree is 10 Pa.

[0125] Step S5, pressurizing: the horizontal pressing mold is pressurized, the pressing scale is 6 mm (the whole stroke is 6 mm), and the secondary multifilament in the optical fiber bundle is fused together.

[0126] Step S6, furnace discharging, demolding and processing: the horizontal pressing mold is taken out from the furnace and placed in a heat preservation box to cool to room temperature. The horizontal pressing mold is taken out from the heat preservation box, demolded to obtain the optical fiber panel blank. The optical fiber panel blank after the fusion pressing is subjected to subsequent processing to obtain the optical fiber panel finished product. The subsequent processing includes: being rounded into a cylinder with a diameter of 25 mm by a rounding machine, being further cut into a cylinder with a height of 15 mm by an inner circle cutting machine, and being polished by a polishing machine, and no scratch is observed under 8 times magnification.

[0127] In this embodiment, the Ar is introduced to heat the secondary multifilament, so that the optical fiber panel is uniformly heated inside and outside, the performance uniformity of the optical fiber panel is improved, and the fusion pressing process time is reduced. Compared with Example 1, the gas flow rate is reduced to 0.5 L / min. The optical fiber panel prepared in this embodiment has a maximum difference of 0.09% in transmittance at different positions and a maximum difference of 11 p / mm in resolution at different positions when the wavelength is 400-1000 nm.

[0128] Example 5

[0129] The embodiment provides a preparation method of a high-uniform optical fiber panel, and the method comprises the following steps:

[0130] Step S1, preparing an optical fiber bundle:

[0131] (1) a core glass rod (glass brand H-LaK3) is fused, the outer diameter is 29 mm, and the length is 1000 mm; a skin glass tube (glass brand H-K9) is fused, the inner diameter is 30 mm, the wall thickness is 2 mm, and the length is 1000 mm; the core glass rod is sleeved into the skin glass tube to prepare an optical fiber preform rod.

[0132] (2) the optical fiber preform rod is placed in a drawing furnace to draw a single filament with a filament diameter of 2 mm and a length of 1000 mm at 900℃.

[0133] (3) the single filaments are arranged into a regular hexagon, 6 single filaments are arranged on each side to form a primary multifilament rod, the primary multifilament rod is a regular hexagonal prism, the side length is 30 mm, and the length is 1000 mm.

[0134] (4) Put the primary multifilament rod into the drawing furnace to draw the primary multifilament, with a diameter of 1 mm and a length of 1000 mm.

[0135] (5) Arrange the primary multifilament into a regular hexagon with 13 filaments on each side to form a secondary multifilament rod, which is a regular hexagonal prism with a side length of 30 mm and a length of 1000 mm.

[0136] (6) Put the secondary multifilament rod into the drawing furnace to draw the secondary multifilament, with a diameter of 1 mm and a length of 1000 mm.

[0137] (7) Board arrangement: cut the secondary multifilament into 300 mm and arrange it into a regular hexagonal prism with a side length of 30 mm.

[0138] Step S2, mold loading and furnace loading: place the optical fiber bundle in the cross-pressure mold shown in Figure 3 The left and right ends of the cross-pressure mold have two air holes, one end is an air inlet hole, and the other end is an air outlet hole. Put the cross-pressure mold with the optical fiber bundle into the fusion pressure furnace.

[0139] Step S3, temperature rise and air charging: raise the furnace temperature to 620°C, and at the same time, introduce 620°C preheated Ar into the air inlet hole end of the cross-pressure mold (flow rate is 0.1 L / min, 180 min), and discharge through the air outlet hole end.

[0140] Step S4, vacuumizing: stop the Ar introduction, and vacuumize the furnace to a vacuum degree of 10 Pa.

[0141] Step S5, pressurizing: pressurize the cross-pressure mold, with a lower pressure scale of 6 mm (the entire stroke is 6 mm), and the secondary multifilament in the optical fiber bundle is fused together.

[0142] Step S6, furnace discharge, demolding, and processing: take the cross-pressure mold out of the furnace and place it in a heat preservation box to cool to room temperature. Take the cross-pressure mold out of the heat preservation box, demold to obtain the optical fiber panel blank. Perform subsequent processing on the fusion-pressed optical fiber panel blank to obtain the finished optical fiber panel. The subsequent processing includes: rolling into a cylinder with a diameter of 25 mm through a rolling machine, further cutting into a cylinder with a height of 15 mm through an inner circle cutting machine, and polishing through a polishing machine, with no scratches observed under 8 times magnification.

[0143] In this example, Ar is introduced to heat the secondary multifilament, which uniformly heats the inside and outside of the optical fiber panel, improves the performance uniformity of the optical fiber panel, and reduces the fusion pressure process time. The gas flow rate is reduced to 0.1 L / min compared with Example 1. The optical fiber panel prepared in this example has a maximum difference of 0.1% in average transmittance at different positions and a maximum difference of 11 p / mm in resolution at different positions when the wavelength is 400-1000 nm.

[0144] Comparative Example 1

[0145] The present comparative example provides a preparation method of a conventional optical fiber panel, comprising the following steps:

[0146] Step S1, preparing an optical fiber bundle:

[0147] (1) A core glass rod (glass brand H-LaK3) with an outer diameter of 29 mm and a length of 1000 mm is fused, and a skin glass tube (glass brand H-K9) with an inner diameter of 30 mm, a wall thickness of 2 mm and a length of 1000 mm is fused, the core glass rod is sleeved into the skin glass tube to prepare an optical fiber preform rod.

[0148] (2) The optical fiber preform rod is placed in a drawing furnace for drawing, and a single yarn with a yarn diameter of 2 mm and a length of 1000 mm is drawn at 900°C.

[0149] (3) The single yarn is arranged into a regular hexagon, 6 single yarns per side, to form a primary multifilament rod, which is a regular hexagonal prism with an edge length of 30 mm and a length of 1000 mm.

[0150] (4) The primary multifilament rod is placed in a drawing furnace for drawing, and a primary multifilament with a yarn diameter of 1 mm and a length of 1000 mm is drawn.

[0151] (5) The primary multifilament is arranged into a regular hexagon, 13 per side, to form a secondary multifilament rod, which is a regular hexagonal prism with an edge length of 30 mm and a length of 1000 mm.

[0152] (6) The secondary multifilament rod is placed in a drawing furnace for drawing, and a secondary multifilament with a yarn diameter of 1 mm and a length of 1000 mm is drawn at 900°C.

[0153] (7) Board arrangement: the secondary multifilament is cut into 300 mm and arranged into a regular hexagonal prism with an edge length of 50 mm.

[0154] Step S2, mold loading and furnace loading: the optical fiber bundle is placed in a vertical pressing mold, and Figure 2 Compared with the vertical pressing mold, the upper and lower ends of the vertical pressing mold have no air holes. The mold loaded with the optical fiber bundle is placed in a fusion pressing furnace.

[0155] Step S3, vacuumizing, heating and holding: the furnace is vacuumized to a vacuum degree of 10 Pa, the furnace is heated to 620°C, and held for 90 min.

[0156] Step S4, pressurizing: the vertical pressing mold is pressurized, and the secondary multifilament in the optical fiber bundle is fused together with a pressing scale of 6 mm (the whole stroke is 6 mm).

[0157] Step S6, furnace discharge, demolding and processing: the vertical compression mold is taken out from the furnace and placed in a heat preservation box to cool to room temperature. The vertical compression mold is taken out from the furnace and demolded to obtain a fiber panel blank. The fiber panel blank after fusion compression is subjected to subsequent processing to obtain a fiber panel finished product. The subsequent processing includes: rolling into a cylinder with a diameter of 45 mm by a rolling machine, further cutting into a cylinder with a height of 15 mm by an inner circle cutting machine, polishing by a polishing machine, and no scratches under 8 times magnification.

[0158] In the fusion compression process of the comparative example, no heat-conducting gas is introduced. During the heating process, the fiber panel is heated from the outside, and the heat is transferred to the inside through heat conduction. Due to the low thermal conductivity of glass, the temperature difference between the inside and the outside of the fiber panel is large, and it takes 90 minutes to reach thermal equilibrium. The minimum difference in transmittance at different positions of the fiber panel prepared in the comparative example is 0.6% at a wavelength of 400-1000 nm, and the minimum difference in resolution at different positions is 21 p / mm. The process time is increased by 90 minutes, which reduces the production efficiency.

[0159] Comparative Example 2

[0160] The present comparative example provides a preparation method of a conventional fiber panel, comprising the following steps:

[0161] Step S1, preparation of a fiber bundle:

[0162] (1) A core glass rod (glass brand H-LaK3) with an outer diameter of 29 mm and a length of 1000 mm is fused, and a skin glass tube (glass brand H-K9) with an inner diameter of 30 mm, a wall thickness of 2 mm, and a length of 1000 mm is fused. The core glass rod is sleeved into the skin glass tube to prepare a fiber preform rod.

[0163] (2) The fiber preform rod is placed in a drawing furnace to draw a single filament with a filament diameter of 2 mm and a length of 1000 mm at 900°C.

[0164] (3) The single filaments are arranged in a regular hexagon, 6 single filaments per side, to form a primary multifilament rod, which is a regular hexagonal prism with an edge length of 30 mm and a length of 1000 mm.

[0165] (4) The primary multifilament rod is placed in a drawing furnace to draw a primary multifilament with a filament diameter of 1 mm and a length of 1000 mm.

[0166] (5) The primary multifilaments are arranged in a regular hexagon, 13 per side, to form a secondary multifilament rod, which is a regular hexagonal prism with an edge length of 30 mm and a length of 1000 mm.

[0167] (6) The secondary multifilament rod is placed in a drawing furnace to draw a secondary multifilament with a filament diameter of 1 mm and a length of 1000 mm at 900°C.

[0168] (7) Arranging: cutting the secondary filaments into 300 mm, arranging into regular hexagonal prism, and the opposite side is 50 mm.

[0169] Step S2, mold loading and furnace loading: placing the optical fiber bundle in the horizontal pressing mold, and the left and right ends of the horizontal pressing mold are not provided with air holes. Figure 3 Compared with the left and right ends of the horizontal pressing mold, the horizontal pressing mold is not provided with air holes. The horizontal pressing mold loaded with the optical fiber bundle is placed in the fusion pressing furnace.

[0170] Step S3, vacuumizing, heating and heat preservation: vacuumizing the furnace to a vacuum degree of 10 Pa, heating the furnace to 620 DEG C, and heat preserving for 90 min.

[0171] Step S4, pressurizing: pressurizing the horizontal pressing mold, and the lower pressing scale is 6 mm (the whole stroke is 6 mm), and the secondary filaments in the optical fiber bundle are fused together.

[0172] Step S5, furnace discharging, demolding and processing: taking out the horizontal pressing mold from the furnace, and placing it in a heat preservation box to cool to room temperature. Taking out the horizontal pressing mold from the heat preservation box, demolding to obtain the optical fiber panel blank. Subsequent processing is performed on the fused optical fiber panel blank to obtain the finished optical fiber panel. The subsequent processing includes: rolling into a cylinder with a diameter of 45 mm through a rolling machine, further cutting into a cylinder with a height of 15 mm through an inner circle cutting machine, polishing through a polishing machine, and observing no scratches under 8 times of a mirror.

[0173] In the fusion pressing process of the pair of examples, no heat-conducting gas is introduced, in the heating process, the outside of the optical fiber panel is heated first, and the heat is transferred to the inside through heat conduction. Since the glass heat conductivity coefficient is not high, the temperature difference between the inside and the outside of the optical fiber panel is large, and it takes 90 min to reach thermal equilibrium. The optical fiber panel prepared in the pair of examples has a minimum difference of 0.5% in transmittance at different positions and a minimum difference of 3 lp / mm in resolution at different positions when the wavelength is 400-1000 nm. The process time is increased by 90 min, and the production efficiency is reduced.

[0174] In the description of the present application, a large number of specific details are described. However, it can be understood that the embodiments of the present application can be practiced without these specific details. In some embodiments, well-known methods, structures and techniques are not shown in detail in order not to obscure the understanding of the present description.

[0175] In addition, it should be noted that each specific technical feature described in the above specific embodiments can be combined in any appropriate manner without contradiction, and in order to avoid unnecessary repetition, the present application will not describe various possible combinations again.

[0176] Furthermore, the various embodiments of the present application can be combined with each other, as long as it does not violate the spirit of the present application, it should also be considered as disclosed by the present application.

[0177] The above is only the preferred embodiment of the present application, not any form of the present application, any simple modification, equivalent change and modification of the above embodiment according to the technical essence of the present application, still belongs to the scope of the technical scheme of the present application.

Claims

1. A method for fabricating a highly uniform optical fiber panel, characterized in that, Includes the following steps: Step 1: The fiber bundle is obtained by melting core / skin glass, preparing preforms, drawing single filaments, arranging first multifilament rods, drawing first multifilaments, arranging second multifilament rods, drawing second multifilaments, and arranging the fiber bundle. Step two: The fiber bundle is placed in a fusion pressing environment and heated and filled with gas. The gas, after being preheated, is blown towards one end of the fiber bundle. Then, when the gas passes through the boundary of the secondary multifilaments of the fiber bundle, it transfers heat to the secondary multifilaments, ensuring that the secondary multifilaments at different locations are heated uniformly. The gas is an inert gas. The heating temperature is 450℃~750℃. The inert gas is He, Ar, or N2. The flow rate of the inert gas is 0.01~100L / min. Step 3: Evacuate the melting and pressing environment to make the vacuum level less than 10 Pa; Step 4: Pressurize the fusion environment and reduce the pressure scale to 1mm to 500mm to fuse the secondary multifilaments in the fiber bundle into one piece. Step 5: After cooling the melting and pressing environment to below 100°C, the fiber bundle is demolded and further processed to obtain the fiber panel.

2. The method for fabricating a highly uniform optical fiber panel as described in claim 1, characterized in that, In step one, the core glass is borosilicate glass; the outer glass is borosilicate glass; and the optical fiber bundle is a square prism, hexagonal prism, octagonal prism, decaprism, or dodecagonal prism with opposite side dimensions of 20mm to 2000mm.

3. The method for fabricating a highly uniform optical fiber panel as described in claim 1, characterized in that, In step two, the preheating temperature is consistent with the temperature in the melting and pressing environment, so that the fibers of the optical fiber bundle are heated to a consistent temperature.

4. The method for fabricating a highly uniform optical fiber panel as described in claim 1, characterized in that, In step five, the subsequent processing includes rolling the cylinder into a diameter of 10 to 100 mm using a rolling mill, further cutting it into a cylinder with a height of 3 to 100 mm using an inner circle cutting machine, and polishing it using a polishing machine.

5. A highly uniform optical fiber panel, characterized in that, The highly uniform optical fiber panel is prepared by the method described in any one of claims 1-4.

6. The highly uniform optical fiber panel as described in claim 5, characterized in that, The transmittance difference of the highly uniform optical fiber panel at different positions is less than or equal to 0.1% when the wavelength is 400-1000nm; the resolution difference of the highly uniform optical fiber panel at different positions is less than or equal to 1lp / mm.

7. A low-light image intensifier, characterized in that, The low-light image intensifier uses the highly uniform fiber optic panel described in claim 5 or 6.

8. A high-brightness, high-definition display, characterized in that, The high-brightness, high-definition display uses the highly uniform fiber optic panel as described in claim 5 or 6.

9. An optocoupler, characterized in that, The optocoupler uses the highly uniform fiber optic panel as described in claim 5 or 6.

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