JPS59125710A - Coupling part between optical fiber flux and element - Google Patents

Abstract

PURPOSE:To obtain a coupling part allowed to couple plural optical fibers with one light emitting element by thinly tightening the end part of optical fiber flux obtained by binding plural optical fibers. CONSTITUTION:The light emitting element 11 is coupled with the optical fiber flux 10 consisting of 4 optical fibers 9. The end part of the optical fiber flux 10 is thinly tightened and the sectional area of each optical fiber 9 is reduced. The diameter d2 of the tightened optical fiber 9 is about 1/2 the diameter d1 of the untightened optical fiber 9. Therefore, the sectional area of the tightened optical fibers 9 is approximately equal to one untightened optical fiber 9 and smaller than the sectional area of the light emitting element 11. Consequently, the same light (a) can be transmitted to the four optical fibers 9 simultaneously only by one light emitting element 11. In order to tighten the end part of the optical fiber flux thinly, the end part of the optical fiber flux is pulled in the axial center direction of the optical fiber flux while applying heat uniformly to the end part of the optical fiber flux.

Description

[Detailed description of the invention] related.

When transmitting light using an optical fiber, a light emitting element is coupled to one end of the optical fiber, and a light receiving element is coupled to the other end.

When sending the same light to multiple optical fibers, conventionally one light emitting element 2 is coupled to one optical core/pal as shown in Fig. 1, and each light afl is sent. Conventionally, as shown in FIG. 2, one light receiving element 4 is coupled to one optical fiber 3, and different lights a -
The receiver is "taking" the d.

However, coupling one light-emitting element or light-receiving element to one optical fiber in this way increases the cost and increases the size of the coupling part. That's why?
Even if an attempt is made to couple a Ha optical fiber with one light-emitting element or light-receiving element, the cross-sectional area of the element is only slightly larger than the cross-sectional area of the optical fiber. It is difficult to connect individual elements.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a coupling portion between a bundle of optical fibers and an element, which can couple a plurality of optical fibers and one element.

The structure of the present invention which achieves this object is as follows: The end of a bundle of optical fibers is narrowed down into a thin bundle, and one element is coupled to the end of the bundle of optical fibers. , the present invention will be explained in detail based on embodiments shown in the drawings.

In this embodiment, as shown in FIG. 3, a light emitting element 11 is coupled to an optical fiber bundle 10 consisting of four optical fibers 9. The ends of the optical fiber bundle 10 are narrowed, and the cross-sectional area of each optical fiber 9 is small. As shown in FIGS. 4 and 5, which are cross-sectional views of the optical fiber 9 before and after being narrowed down, the diameter d of the optical fiber 9 after being narrowed down is
2 is the optical fiber 9 before narrowing, and the cross-sectional area of the four optical fibers 9 after the narrowing is the optical fiber 9 that has not been narrowed down.
The cross-sectional area of the light-emitting element 11 is approximately equal to the area of one area of 01 lines, and is smaller than the cross-sectional area of the light-emitting element 11. Therefore, one light emitting element 11 can simultaneously transmit the same light a to four optical fibers 9.

In order to narrow down the end of the optical fiber bundle to MU, apply heat evenly to the end of the optical fiber bundle and pull the end of the optical fiber bundle in the axial direction of the optical fiber bundle. Just do it. Then, each of the optical fibers S constituting the bundle of optical fibers is squeezed at approximately the same rate.

In this case, if the material of the optical fiber is plastic, it can be squeezed easily, but if it is made of glass, sufficient heating is required to squeeze it.

In this embodiment, although the coupling portion of a bundle of optical fibers consisting of four optical fibers is shown, the number of optical fibers is not limited to four. Further, although only a coupling portion in which a light emitting element is coupled is shown, a light receiving element may be coupled in place of the light emitting element.

As described above with reference to the embodiments and drawings, according to the present invention, a plurality of optical fibers are coupled to eleven light emitting elements or light receiving elements, so the number of light emitting elements or light receiving elements used can be reduced. As a result, it is possible to reduce costs and reduce the size of the coupling part of the optical fiber bundle, and also to simultaneously send light to a plurality of optical fibers, increasing the versatility of the optical communication system including the optical fiber connector.

[Brief explanation of drawings]

FIGS. 1 and 2 are explanatory diagrams showing a conventional coupling part for a bundle of optical cores, FIGS. 3 to 5 relate to a coupling part for a bundle of optical fibers according to the present invention, and FIG. 3 is an explanatory diagram. , FIG. 4, and FIG. 5 are a sectional view taken along the line AA and BB in FIG. 3, respectively. In the drawings, 9 is an optical fiber, 10 is a bundle of optical fibers, and 11 is a light emitting element. Patent Applicant Sumitomo Electric Industries, Ltd. Representative Patent Attorney Shibu Mitsuishi (and 1 other person) Condolence Figure 1 Figure 2

Claims (1)

[Claims] An optical fiber, characterized in that the end of a bundle of optical fibers, which is a bundle of a plurality of optical fibers, is narrowed and one element is coupled to the end of the bundle of optical fibers that is narrowed. The joint between the bundle and the element.