JPS61148408A - Multicore optical multiplexer demultiplexer - Google Patents

Abstract

PURPOSE:To reduce the size of an optical multiplexer demultiplexer by exposing end surfaces of respective optical fibers connecting with an optical multiplexing demultiplexing part while they are arrayed on an end surface of a resin molding body, and making a batch connection with lead optical fibers by a multicore optical connector. CONSTITUTION:The 1st, the 2nd, and the 3rd optical fiber array bodies 11, 12, and 13 consisting of optical fibers 11a-11d, a-12d, and 13a-13d are embedded in a resin mold while arrayed at specific intervals and end surfaces of the optical fibers 11a-11d, 12a-12d, and 13a-13d are exposed to end surfaces 11e and 11f, 12e and 12f, and 13e and 13f of the array bodies 11, 12, and 13. Then, the respective end surfaces 11f, 12f, and 13f are cut at 45 deg. and set abutting to form branch parts 15a-15d, thereby assembling a T-shaped optical multiplexer demultiplexer 10. The optical multiplexer dimultiplexer 10 is connected to the multicore optical connector 22 and then the optical fibers 11a-11d are connected to the lead optical fibers 21a-21d at a time.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to an optical multiplexer/demultiplexer for multiplexing or demultiplexing light, and particularly to an optical multiplexer/demultiplexer for multi-core optical fibers.

(Prior art and its problems) Figure 3 shows the basic structure of an optical multiplexer/demultiplexer using optical fibers. Reference numeral 1a is a first optical fiber, 1b is a second optical fiber, and IC is a third optical fiber, each of which is composed of a core 2 and a cladding 5. first and third optical fibers z<l
The optical fibers a and lc have end faces cut symmetrically at an angle of 45 degrees on both sides of the central axis, and the second optical fiber 1b has an end face cut in one direction at an angle of 45 degrees. Further, an interference film filter is attached to the end face of the second optical fiber 1b. These optical fibers 1a11b, IC
The optical multiplexing/demultiplexing section 5 is constructed by coupling one side of the two without any gaps.

Now, wavelengths λ1 and λ! are connected to the first optical fiber 1a. When light of wavelength λ is input (solid arrow), the light of wavelength λ passes through interference film filter 4.
The light with the wavelength λ passes through the interference film filter 4 and enters the second optical fiber 1b. The nine lights are separated. On the contrary, the third
When light with a wavelength λl is input into the optical fiber IC and light with a wavelength λ is input into the second optical fiber 1b (dotted arrow), the light with the wavelength λ is reflected by the interference film filter and passes through the first optical fiber. The light with the wavelength λ also passes through the interference film filter and enters the first optical fiber 1a. In other words, light is combined. An optical multiplexer/demultiplexer functions as described above.

This type of optical multiplexer/demultiplexer is used with lead optical fibers connected to the ends of each optical fiber. However, conventional optical multiplexers/demultiplexers have a structure in which each optical fiber is individually connected to a lead optical fiber via a connector via an appropriate adapter, which has the disadvantage of increasing the size of the package. The fiber connections were also troublesome because they had to be connected individually.

(Means for solving problems and their effects) The present invention has been made to solve the problems of the prior art as described above. Embedded in the first
, second and third optical fiber arrays are formed, one end surface of the first optical fiber array is cut in one direction at an angle of 45 degrees, and the end surface of each optical fiber exposed from the end surface is cut in one direction. are each provided with an interference film filter, and the second,
One end face of the third optical 7-eyeper array is connected to each optical fiber.
Both sides of the optical fiber array are cut symmetrically at an angle of 145 degrees centering on the axis of the fiber, and the cut end faces of the first, second, and second optical fiber array bodies are butted against each other and exposed from each end face. The optical fibers are combined into a T-shape with their axes aligned.

In this way, the end faces of each party fiber connected to the optical multiplexing/demultiplexing section will be exposed in alignment with the end faces of the resin molded body, so it is possible to connect the lead optical fibers all at once using a multi-core optical connector. becomes.

(Embodiment) FIGS. 1 to 3 show a multi-core optical multiplexer/demultiplexer according to an embodiment of the present invention. In the figure, 10 indicates an optical multiplexer/demultiplexer. 1
1 is a first optical fiber array constituting the optical multiplexer/demultiplexer 10, and 12.13 is a third optical fiber array. Each optical fiber array 11.12.13 has optical fibers 1la-11d, 12a-126113a to 13(
1 are embedded in the resin mold body 9 in a state where they are arranged at predetermined intervals, and each optical fiber lla to 11d112
The end faces of a to 126 and 13a to 13d are aligned bodies 11.
12.13 end faces lie, llf, 12e.

12r, 15e, and 15f are exposed. One end face lie of the first optical fiber array 11 is perpendicular to the axis of the optical fibers lla to 11 (1), and the other end face 11
f is cut in one direction at an angle of 115 degrees with respect to the axis of the optical fibers lla to 11d, and an interference film filter 114 is provided on the end face of the optical fibers lla to 11d exposed from the end face 11f. [Second and Third Light] The fiber array body 12.13 has one end surface 12e, 15e perpendicular to the axis of the optical fibers 12a to 12d, and the other end surface 12f.
113f is the optical fiber 12a-12d, 13a to IL
Both sides are cut symmetrically at an angle of l+5 degrees with respect to the axis d.

And first to third optical fiber array bodies 11.12
．． 13 are end faces 11f and 1 cut at 45 degrees, respectively.
2f and 13f are butted against each other, and the optical fiber ll on each end face is
With the axes a to lid and 12a to 126115a to 13d aligned, branch portions 15a to 15d are formed, and the whole is combined into a T-shape as shown in FIG. In addition, the end face lie, 12 of the array body 11.12.13
e, 15e includes aligned optical fibers 11a-116,
A pair of holes 16 for fitting positioning pins are formed so as to be located on both sides of 12a to 126, 13a to 13 (1).

FIG. 4 shows how the optical multiplexer/demultiplexer 10 is used.

Reference numerals 20a to 20d are optical fiber core wires for leads to be connected to the optical multiplexer/demultiplexer 10, 21a to 21d are optical fibers exposed at their tips, and 22 are optical fibers 21a to 2.
16 is a known multi-fiber optical connector that aligns and holds the multi-fiber optical connector 22 at a predetermined interval, 23 is a pair of alignment pin fitting holes formed in the multi-fiber optical connector 22, and 24 is an alignment pin that connects the hole 16 and the hole. It is inserted in communication with 23. in this way,
When this optical multiplexer/demultiplexer 10 is aligned with the pins 214 and connected to the multi-core optical connector 25, each optical fiber l
la to 1id (12a-126, 13a to 13d) can be collectively connected to read optical fibers 21a to 21d.

(Effects of the Invention) As explained above, in the optical multiplexer/demultiplexer of the present invention, the end portions of each optical fiber connected to the optical multiplexer/demultiplexer are aligned and exposed on the end face of the resin molded body, so the optical multiplexer/demultiplexer of the present invention has multiple fibers. The use of an optical connector has the advantage that the lead optical fiber can be made smaller and the lead optical fiber can be easily connected.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a multi-core optical multiplexer/demultiplexer according to an embodiment of the present invention, and FIGS. 2 (a) and (b) are perspective views of one member constituting the multi-core optical multiplexer/demultiplexer of the same embodiment. 3 is a sectional view of the multi-core optical multiplexer/demultiplexer of the same embodiment, FIG. 4 is a sectional view showing the usage state of the optical multiplexer/demultiplexer, and FIG. 3 is an explanatory diagram of the optical multiplexer/demultiplexer. . 9...Resin mold, 10...Multi-core multiplexer/demultiplexer 11.12.13...Optical fiber array body, 111...Interference film filter, 11. 'a~1
-1 dl: 12 L, ~12d115a~15d...
...Optical fiber 12 (13) Fig. 4 Fig. 3

Claims (1)

[Claims] A plurality of optical fibers are aligned at predetermined intervals and embedded in a resin mold body to form first, second, and third optical fiber array bodies, and the first optical fiber array body is one of the optical fiber array bodies. The end face of each optical fiber is cut in one direction at an angle of 45 degrees, and an interference film filter is provided on the end face of each optical fiber exposed from the end face, and the second and third optical fiber array bodies are cut in one end face. are cut symmetrically at 45 degrees on both sides centering on the axis of each optical fiber, and the first, second,
The third optical fiber array is a multi-core optical combiner, characterized in that the cut end faces are abutted against each other and the optical fibers on each end face are aligned and assembled into a T-shape. Wave equipment.