JPS6247604A - Terminal part for multicore fiber - Google Patents

Abstract

PURPOSE:To obtain a simple terminal part having small connection loss as a terminal of a multicore fiber by making a fusion splicing of a bundle body obtained by bundling and welding mutually single-core fibers as many as cores of the multicore fiber at the same pitch. CONSTITUTION:The lead-out single-core fiber bundle body 2 obtained by bundling single core fibers having a clad 2a formed around a single core 2b in one body at the same pitch by as many as cores of the multicore fiber 1 formed by arranging plural cores in the same clad 1a at specified pitch and welding integrally end parts where contact surfaces of adjacent clads 2a are connected to at least the multicore fiber 1 is positioned properly and fusion spliced to the terminal of the multicore fiber 1. Consequently, the simple terminal part of the multicore fiber which has small connection loss is obtained in a short operation time.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to an end portion of a multi-core fiber in which a plurality of cores are arranged at a predetermined pitch within the same cladding.

(Prior Art) In recent years, multi-core fibers in which a plurality of cores are arranged at a predetermined pitch within the same cladding have been developed. Such a multi-core 7-IPA is compact as an optical transmission line, and the outer diameter can be made small especially when used in an ultra-multi-core optical cable, but the cores can be individually pulled out from the terminal of the multi-core fiber to emit light When connecting to a light receiving element or other single core 7-eyeper, it is extremely difficult to individually pull out the plurality of cores formed integrally with the cladding. For this reason, conventionally, a single-core fiber consisting of a single core with a cladding integrally formed thereon was bundled with a jig to the same number and pitch as the number of cores of the multi-core fiber, and butted against the end of the multi-core fiber, so that the cores of both The terminal portion of the multi-core fiber was formed by adjusting the positions so that they matched and fusion splicing, but it was necessary to converge multiple single-core fibers with an outer diameter in μmφ using a jig at the same pitch as the core pitch of the multi-core fiber. However, it is very difficult to butt and fix the terminals of multi-core fibers and fusion splice them, even with highly skilled technology, and even if a microscope is attached to the fusion device, the work takes a long time. was there.

(Structure of the present invention) The present invention has been made for the purpose of eliminating the above-mentioned drawbacks.The present invention has been made for the purpose of solving the above-mentioned drawbacks. A single-core 7-eyeper assembly for drawing out is formed by converging integrally formed single-core 7-eyepers in the same number and at the same pitch as the number of cores of the multi-core fiber, and fusion-splicing the single-core 7-eyeper assembly for drawing out, which is fused between adjacent cladding contact surfaces at least at the ends. It is characterized by this.

(Embodiment of the present invention) Hereinafter, one embodiment of the present invention will be described with reference to the drawings.
In the figure and Fig. 2, 1 indicates a core 1 in the same cladding la.
A multi-core fiber 2 is a single-core fiber in which a cladding 2α is integrally formed on a single core 2b, and a multi-core fiber 2 is formed by arranging a plurality of cladding 2α on a single core 2b at a predetermined pitch.
This is a single-core fiber assembly for drawing, which is made by converging the same number of cores at the same pitch and integrally fusing the contact surfaces of adjacent clads 2a.
is connected to the terminal of the multi-core fiber 1 by aligning the individual cores with each other, as shown in 11'l. Thus, the multi-core fiber end portion of the present invention is obtained by butting and fixing the multi-core fiber 1 and the drawing single-core fiber assembly 2 to the jigs B and Bl of the fusion splicer A with a rotating device, as shown in Fig. 3. Then, rotate one of the jigs, emit light from the pull-out single-core fiber assembly 2 side with the photodiode 3, receive the light output to the multi-core 7 eyepel side with the LXD 4, and monitor the output. Then, the rotation of the jig is stopped at the position where the sum output from each core is maximum.
For example, the single-core fiber assembly 2 for extraction is fusion-spliced to the terminal of the multi-core fiber 1 with the ends of each core 1b in the multi-core fiber l and each core 2b of the single-core fiber assembly 2 for extraction matched. A terminal section 111 is constructed by the method. Note that a plurality of single core 7 eyepers are focused into a predetermined shape and the adjacent crud 2α contact surface an
For fusion, multiple single-core fibers are bundled into a predetermined shape using a jig, and the cladding 2α of the bundled single-core fibers is heated to L600°C to 1,800°C with an oxyhydrogen flame burner or the like. fuse. In addition, in order to separate and draw out the single-core fiber assembly 2 for drawing out that is fusion-spliced to the end of the multi-core 7-iper 1, it can be easily separated and drawn out by simply immersing it in an etching solution such as 7-acid for a short time. be able to.

In the above embodiment, the drawing single-core fiber assembly 2 is integrally fused between adjacent clad contact surfaces in the longitudinal direction, but the drawing single-core fiber assembly 2 is a multi-core fiber assembly 2. Only the cladding at the end connected to the fiber 1 may be integrally fused. In such a case, since the single-core fibers are separated into four individual pieces on the free side of the single-core fiber assembly 2 for extraction, they can be directly connected to a light-emitting/receiving element, other single-core fibers, etc.

(Effects of the present invention) According to the present invention, as described above, the cladding 2α is integrally formed on the single core 2b at the terminal of the multi-core fiber 1 in which a plurality of cores lb are arranged at a predetermined pitch within the same cladding 1α. A multi-core fiber is obtained by converging the same number of single-core fibers at the same pitch as the number of cores of the multi-core fiber 1, and by fusion-splicing the single-core fiber assembly 2 for drawing out, which is fused between the contact surfaces of adjacent clads 2a at least at the ends. By configuring the terminal part, the multi-core fiber 1 and the pull-out single-core fiber assembly 2 are butt-fixed to the jigs B and W in the fusion splicer A, and the individual cores are aligned with each other to perform fusion splicing. This method has an excellent advantage in that a multi-core fiber terminal section with very low splice loss can be easily obtained by performing an extremely simple and short-time operation.

[BRIEF DESCRIPTION OF THE DRAWINGS] Fig. 1 is an explanatory view showing the terminal part of the multi-core fiber of the present invention, Fig. 2 is a perspective view showing the multi-core fiber and the single-core fiber assembly for drawing out in the present invention, and Fig. 3 is an explanatory view showing the terminal part of the multi-core fiber of the present invention.
The figure is an explanatory diagram showing the borrowing means of the present invention. 1: Multi-core file/single core file collection for arm drawer No. 112X Rod 2 No. 3121 5 Ill'

Claims (1)

[Claims] At the end of a multi-core fiber in which a plurality of cores are arranged at a predetermined pitch in the same cladding, a single-core fiber in which a cladding is integrally formed on a single core is bundled at the same pitch as the number of cores in the multi-core fiber, and at least the end 1. A terminal section of a multi-core fiber, characterized in that it is formed by fusion-splicing an assembly of single-core fibers for drawing out which are fused between adjacent cladding contact surfaces of the section.