WO2016010344A1

WO2016010344A1 - Optical fiber transfer link and light collecting device using same

Info

Publication number: WO2016010344A1
Application number: PCT/KR2015/007305
Authority: WO
Inventors: 조규만; 윤승현; 박준규
Original assignee: 서강대학교 산학협력단
Priority date: 2014-07-14
Filing date: 2015-07-14
Publication date: 2016-01-21
Also published as: KR20160008673A

Abstract

The present invention relates to an optical fiber transfer link having good light receiving efficiency, and a light collecting device. The optical fiber transfer link is provided with: a compound parabolic concentrator having a first end portion and a second end portion that are disposed to face one another on a single central axis passing through a body of the concentrator; and a single optical fiber having one end connected to the second end portion. The body of the compound parabolic concentrator is configured of a plurality of paraboloids, and the cross-sectional area of the first end portion is preferably formed to be greater than the cross-sectional area of the second end portion. The light collecting device is characterized by being configured of a plurality of the optical fiber transfer link of the above-described structure arranged in an array configuration.

Description

【Specification】

[Name of invention]

Optical fiber transmission link and condensing device using same

Technical Field

The present invention relates to an optical fiber transmission link and a light collecting device, and more particularly, to minimize the loss of incident light by combining a composite parabolic light collector on the incident surface of the optical fiber, and the range of the emission angle of the output light on the exit surface of the optical fiber. The present invention relates to an optical fiber transmission link and a light concentrating device having a reduced structure to improve condensing performance.

Background Art

Compound parabolic concentrators (C C npound Parabol IC Concentrators; 'CPC') are used to collect light from a single focal point using multiple parabolic surfaces and are widely used as solar concentrators. Such a compound parabolic collector has the advantage of having a wide angle of incidence for receiving light.

On the other hand, in order to observe the plasma state of the fusion device, a Bem Emission Spectroscopy (BES) system using a light collection device is used. 1 is a perspective view and a cross-sectional view showing a light collecting device using a conventional general optical fiber.

Referring to FIG. 1, in the conventional light collecting device, an optical fiber is bundled and used in an array form. In this case, there is a problem in that a lot of dead space is generated at an incident surface to cause loss of received light.

[Detailed Description of the Invention]

[Technical problem]

* 5 The present invention for solving the above-described problems by increasing the light receiving area as much as possible, eliminating the loss of incident light and maximizing the reception efficiency An object of the present invention is to provide a transmission link and a light collecting device using the same. Another area of the present invention comprises a structure that can reduce the range of the emission angle of the light output from the end of the optical fiber, provides an optical fiber transmission link and a light concentrating device using the same easy to apply to the optical system of the next step for analysis It is.

Technical Solution

An optical fiber transmission link according to a first aspect of the present invention for achieving the above technical problem comprises: a compound parabolic condenser having a first end and a second end disposed to face each other on a single central axis passing through a body; One end has a single optical fiber connected to the second end; wherein the body of the composite parabolic collector is composed of a plurality of parabolic surfaces, wherein the cross-sectional area of the first end of the crab is formed to be larger than that of the second end.

In the optical fiber transmission link according to the first aspect described above, the optical fiber is preferably a claddingless fiber (Cl addingless f iber) formed only of a core layer through which light is totally reflected and without a cladding layer and a buffer layer.

It is more preferable that the other end of the optical fiber is formed in a tapered form, the lens is coupled, or the composite parabolic light collector is coupled to reduce the spread angle of light emitted from the other end of the optical fiber.

The light collecting apparatus according to the second aspect of the present invention is characterized in that a plurality of optical fiber transmission links having the above-described configuration are arranged in an array form.

In the light collecting device according to the second aspect described above, when the optical fiber of the optical fiber transmission link is composed of claddingless fibers, it is preferable to further include a spacer for maintaining a constant distance between adjacent optical fibers.

【Effects of the Invention】

The optical fiber ^' transmission link according to the present invention can reduce the loss of incident light by mounting the CPC on the incident surface of the optical fiber, thereby allowing all incident light to be transmitted through the optical fiber. In addition, the optical fiber transmission link according to the present invention can extend the acceptance angle of the optical fiber by using a claddingless fiber.

In addition, the optical fiber transmission link according to the present invention can reduce the spreading angle of the emitted light by configuring the output surface of the optical fiber in the tapered form or by connecting a lens or a compound parabolic condenser. This may facilitate signal transmission of the optical fiber transmission link to the next stage of the system.

[Brief Description of Drawings]

1 is a perspective view and a cross-sectional view showing a light collecting device of a pan-radiation spectrometer using a conventional general optical fiber.

2 is a perspective view and a cross-sectional view showing an optical fiber transmission link according to a preferred embodiment of the present invention.

Figure 3 (a) shows a cross section of a typical optical fiber, (b) shows a cross section of a claddingless fiber according to the present invention.

4 illustrates a result of simulating a spreading angle at which light emitted from an end of the optical fiber is spread when the end of the optical fiber is formed in a plane.

5 is a view illustrating a result of simulating light emitted from an end of an optical fiber and (b) an end of the optical fiber in a tapered form in an optical fiber transmission link according to a preferred embodiment of the present invention. .

6 illustrates a result of simulating light emitted from an end of an optical fiber and (b) an end of the optical fiber in the optical fiber transmission link according to a preferred embodiment of the present invention.

7 illustrates a state in which a CPC is coupled to an end of an optical fiber in an optical fiber transmission link according to a preferred embodiment of the present invention.

8 is a perspective view and a front view illustrating an example of a light converging or image transmitting device configured by arranging a plurality of optical fiber transmission links in an array form according to a preferred embodiment of the present invention. [Best form for implementation of the invention]

The optical fiber transmission link according to the present invention can increase the light receiving area by using a compound parabolic condenser, thereby minimizing incident light loss.

Hereinafter, with reference to the accompanying drawings will be described in detail the structure and operation of the optical fiber transmission link according to an embodiment of the present invention.

2 is a perspective view and a cross-sectional view showing an optical fiber transmission link according to a preferred embodiment of the present invention. Referring to FIG. 2, the optical fiber transmission link 3 according to the present embodiment has a first end 302 and a second end 304 disposed opposite each other on a single central axis passing through the body 300. A composite parabolic collector 30 and a single optical fiber 35 connected to the second end 304.

The body of the compound parabolic condenser 30 is composed of a plurality of parabolic surfaces connected to each other, and in particular, it is preferable that four parabolic surfaces having the same shape are connected to each other. The crab first end of the compound parabolic concentrator 30 is characterized by being formed in a rectangular cross section larger than the cross-sectional area of the second end. The complex parabolic collector may be configured to focus light incident at an effective incident angle on an incident surface of a first end to an exit surface of a second end.

By connecting the second end of the above-mentioned compound parabolic light collector to one end of the optical fiber, it is possible to improve the light receiving efficiency by condensing the light incident to the compound parabolic light collector.

Conventionally, nine optical fibers are bundled and received in bundles, and as shown in FIG. 1, in this case, dead zones are generated and loss of incident light is generated. However, the transmission link according to the present invention mounts the composite parabolic collector at the front of the single optical fiber, thereby providing all the light incident to the front of the composite parabolic collector to the optical fiber without loss. On the other hand, the optical fiber is preferably formed of a claddingless fiber (Cl addingl ess f iber) without the cladding layer and the buffer layer formed of only the core layer through which light propagates. Degree 3 (a) shows a cross section of a general optical fiber, and (b) shows a cross section of a claddingless fiber according to the present invention. Referring to (a) of FIG. 3, a general optical fiber can transmit only light that satisfies the total reflection condition by the cladding layer surrounding the outer circumferential surface of the core layer, and thus has a problem in that the acceptance angle is very limited. . Here, the 'light-receiving angle' refers to the maximum receiving angle that allows the light incident on the optical fiber to transmit and cause total reflection inside the core, and corresponds to twice the maximum incident angle. Therefore, in order for the light to be transmitted inside the core of the optical fiber, the light must be scattered within the maximum angle of incidence. When light is incident on the optical fiber at a large angle out of the light receiving angle, the light is refracted by the cladding and leaks without being totally reflected at the interface between the core and the cladding. Nor will it reach far.

By the way, the general optical fiber has a problem that the light receiving angle is very limited. However, the optical fiber according to the present invention according to the present invention of FIG. 3 (b) has no cladding worm and only the core layer can be used to extend the acceptance angle.

4 illustrates a result of simulating a spreading angle at which light emitted from an end of the optical fiber is spread when the end of the optical fiber is formed in a plane. As shown in Fig. 4, when the end of the optical fiber is flat, the spread angle at the end of the optical fiber is about 90? Because it is formed so wide that it is difficult to transfer to another optical system for analyzing the light from the optical fiber.

In order to solve this problem, it is preferable that the end of the optical fiber of the optical fiber transmission link according to the present invention has a structure that can reduce the range of the emission angle. A structure capable of reducing the range of the exit angle may be configured in the tapered form of the optical fiber, the lens may be coupled to the optical fiber end, or the compound parabolic condenser may be coupled to the optical fiber end. .

Figure 5 shows the results of simulating the light emitted from the end of (a) the optical fiber transmission link according to an embodiment of the present invention (a) the end of the optical fiber in the tapered form and (b) the optical fiber. As shown in Figure 5, the tapered shape is such that the end of the optical fiber so that the center protrudes sharply, such as conical It is composed. As shown in (b) of FIG. 5, it can be seen that the spreading angle of the emitted light is reduced than in (b) of FIG. 4.

Figure 6 shows the results of simulating the light emitted from the end of the optical fiber and the optical fiber transmission link according to an embodiment of the present invention, (a) the lens coupled to the end of the optical fiber (b). As shown in FIG. 6, the hemispherical lens may be coupled to the end of the optical fiber, and in this case, the spread angle of the emitted light may be reduced than in FIG. 4 (b).

FIG. 7 illustrates a state in which a CPC is coupled to an end of an optical fiber in an optical fiber transmission link according to a preferred embodiment of the present invention, and there is no simulation result, but the spreading angle of light output when considering that the optical characteristics of the CPC are reversible It can be seen that this is reduced.

5 to 7, it can be seen that the range of the emission angle of the optical fibers shown in FIGS. 5 to 7 is much reduced than the optical fiber in which the end shown in FIG. 4 is formed in a plane. As such, as the range of the exit angle in the optical fiber of the optical fiber transmission link according to the present invention is reduced, the application to the next optical system for analysis becomes easy. The optical fiber transmission link having the above-described configuration can be used as a light collecting device of a beam emission spectrometer (Beam emission spectroscopy).

FIG. 8 is a perspective view and a front view exemplarily illustrating a light collecting device configured by arranging a plurality of optical fiber transmission links in an array form according to a preferred embodiment of the present invention. As shown in Figure 8, by configuring the optical fiber transmission link in the form of an array of 3 to 3, it is possible to transmit the light without losing the incident light, it can be transferred to the next optical system.

When the optical fiber of the optical fiber transmission link is composed of claddingless fibers, it is preferable to further include a spacer for maintaining a constant distance between adjacent optical fibers. In particular, the above-mentioned light collecting device is for monitoring the plasma state of the fusion device. It can be easily used as a beam emission spectrometer (Beam Emiss ion Spect roscopy) or as a light concentrator of the rimson scattering device. In addition, the above-described light collecting device can be used to efficiently collect sunlight and transmit it to the room, and can also be installed outdoors to be used as indoor lighting.

Although the present invention has been described above with reference to preferred embodiments thereof, it is merely an example, which is not intended to limit the present invention, and those skilled in the art do not depart from the essential characteristics of the present invention. It will be appreciated that various modifications and alterations are not possible in the scope. And differences relating to these modifications and uses will be construed as being included in the scope of the invention defined in the appended claims.

Industrial Applicability

The optical fiber transmission link and the light collecting device according to the present invention can be easily used to observe the plasma state of the fusion device, or can be used as a solar light collecting device.

Claims

[Claims]-

[Claim 1]

A compound parabolic condenser having a first end and a second end disposed to face each other on a single central axis passing through the body;

A single optical fiber having one end connected to the second end;

The body of the composite parabolic collector is composed of a plurality of parabolic surface, the cross-sectional area of the first end is formed larger than the cross-sectional area of the second end, to collect the light incident on the first end to the second end provided Optical fiber transmission link, characterized in that.

[Claim 2]

The optical fiber transmission link according to claim 1, wherein the optical fiber is a claddingless fiber formed only of a core layer through which light is totally reflected and without a cladding layer and a buffer layer.

[Claim 3]

The optical fiber transmission link of claim 1, wherein the other end of the optical fiber has a tapered shape, a lens is coupled, or a compound parabolic condenser is coupled to reduce the spread angle of light emitted from the other end of the optical fiber. .

[Claim 4]

The optical fiber transmission link according to any one of claims 1 to 3, wherein the optical fiber transmission link is used as a light collecting device.

[Claim 5]

A condensing device, characterized in that a plurality of optical fiber transmission links according to any one of claims 1 to 3 are arranged in an array form.

[Claim 6]

(F) The condenser of claim 5, further comprising a spacer for maintaining a constant distance between adjacent optical fibers when the optical fiber of the optical fiber transmission link is made of claddingless fiber.

[Claim 7]

The method of claim 5, wherein the light collecting device is a beam emission spectrometer (Beam Emi ssion

A light collecting device, characterized in that it is used as a light collection device of Spect roscopy or Thomson Scattering spectroscopy.