KR100238879B1 - Multi-step barb using optical fiber preform over cladding - Google Patents

Abstract

end. The technical field to which the invention described in the claims belongs.

The present invention relates to a barb used in fiber cladding over cladding.

I. The technical problem to be solved by the invention.

The present invention prevents the time loss due to the replacement of the barb and the change of the fixed state of the barb in advance, and wear of the barb due to frequent replacement occurs to prevent the damage of the sealed state between the dummy pipe and the barb by this wear Provided is a multi-stage barb used in optical cladding base over cladding that can perform a stable over cladding process.

All. Summary of the Solution of the Invention.

The present invention is a structure that is compatible with each other is composed of one barb of different diameters in one piece or connected to mount two or more types of dummy tube in one barb.

la. Important uses of the invention

Fiber Optic Substrate Over Cladding Process.

Description

Multi-level barbs used for fiber cladding over cladding

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to barbs used in fiber cladding overcladding, and more particularly, to a multi-stage barb in which dummy tubes of different sizes can be mounted.

Typically, a method of manufacturing an optical fiber may be divided into two processes. The first step is to make an optical fiber preform, and the rest of the process is to melt the created base material and draw it into an optical fiber.

In the optical fiber base material manufacturing process, oxygen (O₂) is simultaneously supplied to a chemical gas such as gaseous SiCl 판 and other dopants, and hydrolyzed by a flame, and SiO2 particles called soot are deposited externally. Thereafter, the porous base material is placed in the blast furnace, and there are external deposition methods such as OVD and VAD to produce a transparent optical fiber base material by dehydration and sintering using Cl 2 and He.

In addition, after depositing several layers inside the quartz tube while simultaneously supplying SiCl₄ and other dopants with oxygen inside the quartz tube, the silica tube is supplied with Cl2 and He to the deposited quartz tube while heating and shrinking the quartz. There are internal deposition methods such as MCVD and CVD.

Among the internal vapor deposition manufacturing method MC V D and the method of V V D is a manufacturing method, it is difficult to produce a base material of more than about 25mm in diameter. Therefore, as a means of improving productivity, a method called over cladding is mainly used in which a large-diameter quartz tube is melted and pasted onto a base material prepared by the internal deposition method described above.

The bar which can mount the dummy tube bonded to the secondary tube in the over cladding step in manufacturing the large-diameter base material described above is shown in FIG.

Looking at the configuration of the barb 100 according to a conventional embodiment with reference to the drawings,

Teflon body 110 existing on the upper side, a plurality of wing portions 120 provided below the body 110, the lower portion 130 and the threaded portion 140 is formed to be integrally below the wing portion 120 is formed integrally.

This hollow barb 100 is in communication with the vacuum pump by the threaded portion 140 located on the bottom. In addition, the diameter of the wing portion 120 of the barb is slightly larger than the inner diameter of the dummy tube, when the wing portion 120 is inserted into the dummy tube, the inside is sealed to operate the vacuum pump connected to the bottom to achieve a reduced pressure.

In manufacturing a base material by such a conventional MCVD method, overcladding is a process of joining a secondary tube whose level is controlled and a primary rod whose level is controlled by using a hydrogen hydrogen burner in parallel to reduce the pressure. .

However, the barb used to maintain the airtightness in the secondary tube during such overcladding has the following problems.

First, there is a problem that can be mounted only a dummy tube of a constant size.

Secondly, when mounting dummy tubes of different sizes, the barbs must be replaced at that time, and the barge of the barbs may be unstable due to the time loss and frequent changes due to the replacement of the barbs. It can wear out and damage the sealed state, which can inhibit the stable over cladding process.

The present invention has been made to solve the above-described problems, the object of the present invention is to manufacture a barb that can be equipped with a dummy tube of a different size to replace the bar performed when using a different sized dummy tube By not going through it provides a multi-stage barb used in fiber cladding overcladding that prevents time loss due to barb replacement.

Another object of the present invention is to provide a multi-stage barb used in over cladding of an optical fiber base material which prevents the change of the fixed state of the bar due to replacement.

Another object of the present invention is a multi-stage barb used in the over cladding of an optical fiber base material which can perform a stable over cladding process by preventing wear of the bar due to frequent replacement and preventing damage of the sealed state between the dummy dub and the barb due to the wear. To provide.

In order to achieve the above objects, the present invention is a structure that is compatible with each other is composed of one barb of different diameters in one piece or connected in order to mount two or more kinds of dummy tube in one barb.

1 is a perspective view showing a barb used in optical fiber over cladding according to a conventional embodiment

Figure 2 is a perspective view showing a multi-stage barb used in the optical fiber over cladding according to an embodiment of the present invention

Explanation of symbols on the main parts of the drawing

10,20: Bob 12,22: wings

24: thread

Hereinafter, with reference to the accompanying drawings will be described in detail the most preferred embodiment of the present invention. First, in describing each of the drawings, only the same components have the same reference numerals as much as possible even if shown on different drawings. In describing the present invention, when it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

Figure 2 is a perspective view showing a multi-stage barb according to an embodiment of the present invention. Referring to the drawings,

In the present invention, the other barb 20 is integrally connected to one barb 10. In this case, it can be used by processing the connection type that can be separated from each other, rather than integral processing. For example, it consists of the barb 10 which can mount a dummy tube of A size, and the barb 20 which can mount a dummy tube of B size. The material of each of the barbs 10 and 20 is most preferably teflon or urethane having elasticity.

Looking at the composition of one barb and another barb,

One hollow barb 10 has a Teflon body 11 at the top and a wing portion 12 having an elastic function of a plurality of stacked shapes below the Teflon body 11, and a connecting body 13 at the bottom of the wing portion 12 as before. Configured to extend.

The other hollow barb 20 forms a wing portion 22 having a diameter larger than that of the wing portion 12, and a lower portion 23 having a diameter larger than that of the connecting member 13 extends. In addition, a lower portion 23 extends below the wing portion 22, and a threaded portion 24 is formed below the lower portion 23.

The barb 20 is larger in size than the barb 10 as a whole, and thus each diameter is also large. By varying the size of these diameters, it is possible to mount each dummy tube having a different diameter. That is, the wing portion 12 having a diameter size of the A size is equipped with a dummy tube having an inner diameter size slightly smaller than the size A, and the wing portion 22 having a diameter size of the B size is slightly smaller than the B size. It is used for the dummy tube having.

According to the configuration as described above, dummy tubes having different diameter sizes are inserted into the wings 12 or 22 to seal the inside. Subsequently, the lower part 23 is connected to a vacuum pump to reduce the pressure inside.

In addition, the barbs 10 and 20 manufactured according to the present invention are used for over cladding in parallel with two or more different dummy tubes, and the small size dummy tubes are mounted on the top.

On the other hand, in the detailed description of the present invention has been described with respect to specific embodiments, it will be apparent to those skilled in the art that various modifications are possible without departing from the scope of the present invention.

As described above, the present invention reduces the process time loss caused by the replacement of the barb, and prevents the change of the fixed state of the barb according to the barb change in advance, thereby preventing work that may occur when the fixed state of the barb is poor. Was removed. In addition, it removes the wear margin of the barb due to frequent barb replacement, and removes the stable over cladding work inhibiting factor due to the damage of the sealing state caused by the wear.

Claims (3)

In the barb consisting of a teflon body used for the optical fiber base material over cladding, a wing portion formed and laminated on the lower side of the body, and a lower portion and threaded portion extending to the wing portion side, A multi-stage barb used when over cladding an optical fiber base material, in which another barb having a different diameter is formed in one piece or in a connected form so as to mount two or more dummy tubes on one barb. The multi-stage barb according to claim 1, wherein the material of the second barb is elastic teflon or urethane. The multi-stage barb used in an optical cladding base material over cladding according to claim 1, wherein the diameter of the wing of the other barb is larger than the diameter of the wing of one barb.

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