JPS63167307A - Branch junction for optical fiber - Google Patents

Abstract

PURPOSE:To receive light through plural photodetecting fibers by arranging one projecting fiber and plural photodetecting fibers so that a required distance is formed between the end faces of both optical fibers. CONSTITUTION:Each of the projecting and photodetecting fibers 1, 2 is made of a quartz fiber or a normal fiber and constituted of a core 3 and a clad 4 surrounding the outer circumference of the core 3. In the case of allowing all the optical fibers to detect light, a distance is adjusted so that the end faces of all the photodetecting fibers are converted into a photodetecting face A. Thereby, light projected from the end face of the transmitting fiber 1 are detected by the fiber 2 from the end face of the fiber 2 and transmitted. Consequently, the distribution of light to respective optical fibers 2 can be uniformized and the titled branch junction can be applied to various purposes.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an optical fiber branching junction in which light emitted from a light emitting fiber can be branched and received by a plurality of light receiving fibers.

[Prior Art] Conventional optical fiber branch junctions are generally used for optical communications, and the optical fibers are normal optical fibers with a diameter of 0.5 mm. Multiple thin fibers of 1m or less are welded together. An example of this conventional optical fiber branch junction is shown in FIG. 4, where a indicates one light emitting fiber, and b indicates a plurality of light receiving fibers welded to the end face of the light emitting fiber a.

[Problems to be Solved by the Invention] However, in the above-mentioned branch junction, it is difficult to uniformly weld the light receiving fiber b to the light emitting fiber a for each light receiving fiber b. It is not possible to distribute the light evenly, and the number of receiving fibers b to be welded is limited, and the light from the transmitting fiber a is distributed to all the welded receiving fibers b, so the number of receiving fibers b is limited. It cannot be adjusted, and the above branch junction is for optical communication, so it is 800n.
It would be good if it could send light with a wavelength of about m, but there are problems such as the fact that it cannot be used as a branch junction for combustion diagnostic equipment such as burner flames that need to send light from ultraviolet to infrared rays because the attenuation of ultraviolet rays is too large.

The present invention has been made in view of the above-mentioned circumstances, and has an object of providing an optical fiber branching device that can be applied to a combustion diagnostic device for burner flames and the like.

[Means for Solving the Problems] The present invention has a configuration in which one light emitting fiber and a plurality of light receiving fibers are arranged at a required distance from the end faces of both optical fibers.

[Operation] The light emitted from the end face of the light emitting fiber is equally received by each light receiving fiber from the end face of each light receiving fiber. By adjusting the distance between the end face of the light emitting fiber and the end face of the light receiving fiber, the number of light receiving fibers through which light is received can be changed.

[Example] Hereinafter, an example of the present invention will be described with reference to the accompanying drawings.

Figure 1 shows one embodiment of the present invention, in which 1 is a light emitting fiber, 2
is a plurality of light receiving fibers (4), and there is a distance between the end face of the light emitting fiber 1 and the end face of the light receiving fiber 2! is placed. This distance O is determined by the emission angle θ of the light from the light emitting fiber l and the number of light receiving fibers 2, and it is possible to select the number of light receiving fibers 2 that can be adjusted, or may not be adjustable. You can also do it.

The receiving fibers 1 and 2 are, for example, made of quartz fiber or ordinary fiber with a diameter of 0.411+n or more, and the core 3 is
and a cladding 4 surrounding the outer periphery of the core 3.

For example, if all light receiving fibers 2 are to receive light, the distance must be set so that the end faces of all light receiving fibers 2 fall within the light receiving surface A. is adjusted. Therefore, the light projected from the end face of the light-transmitting fiber 1 is received by the light-receiving fibers 2 from all the end faces of the light-receiving fibers 2 and transmitted.

Figures 2 and 3 show other examples of the arrangement of the light receiving fibers 2 according to the present invention. Figure 2 shows an example in which there are three light receiving fibers 2, and Figure 3 shows an example in which there are six light receiving fibers. . There may be any number of light receiving fibers 2 for one light emitting fiber 1 as long as there is a plurality of light receiving fibers 2.

[Effects of the Invention] According to the optical fiber branching junction of the present invention, there is no need to weld the receiving fiber to the transmitting fiber, so the light can be evenly distributed to each receiving fiber, and the number of receiving fibers can be reduced. Since it can be selected arbitrarily, it can be applied to a variety of applications.Furthermore, if quartz fiber is used, the attenuation of ultraviolet rays is small, so it can be applied to combustion diagnosis of burner flames, etc., and has various excellent effects. It can be played.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of one embodiment of the optical fiber branch junction of the present invention, FIGS. 2 and 3 are explanatory diagrams of other examples of the receiving fiber used in the optical fiber branch junction of the present invention, and FIG. is an explanatory diagram of a conventional optical fiber branch junction. In the figure, 1 is a light emitting fiber, and 2 is a light receiving fiber. Figure 1

Claims (1)

[Claims] 1) An optical fiber branch junction characterized in that one light-emitting fiber and a plurality of light-receiving fibers are arranged at the end faces of both optical fibers at a required distance.