JP3479768B2 - Optical component and method for manufacturing optical component - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical component having a structure in which two optical fibers are connected via an optical film such as a multilayer film filter for selecting the wavelength of light, and a method for manufacturing the same.
Concerning the law .

[0002]

2. Description of the Related Art An example of a conventional structure of this type of optical component is shown in FIG.
Shown in. The optical component shown in FIG. 4 functions as a wavelength selection element that allows only a specific wavelength to pass in the optical wavelength multiplexing technology that allows multiple wavelengths of light to pass through the optical fiber at the same time and performs communication. An optical film 12 forming a multilayer filter is formed on the end face of the fiber 11, and the optical film 1 is formed.
The second optical fiber 13 is arranged such that its end face is abutted with 2.

The connection between the optical fibers 11 and 13 requires alignment of the optical axes so that the light emitted from one optical fiber enters the other optical fiber with low loss. 13 are respectively connected to a light source and a light receiver (not shown), the light emitted from the optical fiber 11 and incident on the optical fiber 13 is measured, and the positions of the optical fibers 11 and 13 are located at the positions where the light amount becomes maximum. The relationship has been adjusted, and after this position adjustment (alignment), the optical fibers 11 and 13 are fixed to the fixing plate 15 using, for example, an adhesive 14.

[0004]

As described above, in the conventional optical parts, the method of aligning while monitoring the light quantity is adopted, and such work is troublesome.
Especially, the core diameter is small like single mode fiber,
When the opening angle is also small, this aligning work is extremely time-consuming and troublesome.

In view of this problem, an object of the present invention is to provide an optical component that does not require centering work, is easy to assemble, and can be configured at low cost, and a manufacturing method thereof .

[0006]

According to the invention of claim 1, an optical film is formed on the end face of the first optical fiber,
In the optical component in which the second optical fiber is connected to the first optical fiber through the optical film, and the connecting portion of the first and second optical fibers is fixed on the substrate, V is formed on the upper surface of the substrate. A groove is formed, and the first and second optical fibers are arranged in the V groove.

The first and second optical fibers are obtained by cutting one optical fiber obliquely with respect to the axis.
It is assumed that a book is provided with blocks attached to both sides of the cut portion before cutting, the blocks are placed on the same plane, and the blocks around the axes of the first and second optical fibers are placed. The structure prevents rotation deviation. That light
The parts are one optical fiber with blocks attached on both sides
Was cut diagonally, and an optical film was molded on one of the cut end faces.
After that, place both optical fibers on the same plane and butt-join them.
It is manufactured by a method of fixing and fixing.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described by way of examples with reference to the drawings. Optical film on the end surface in the figure 1 1
The V groove 22 is formed from one end to the other end on the upper surface of the substrate 21 on which the optical fiber 11 on which the film 2 is formed and the optical fiber 13 connected to the optical fiber 11 via the optical film 12 are mounted. The V groove 22 has a structure in which the connecting portion between the optical fibers 11 and 13 is arranged.

The optical fibers 11 and 13 have the same outer diameter and the same cross-sectional structure. In this example, the optical fibers 11 and 13 each have a connection end face perpendicular to the axis. The optical fibers 11 and 13 are obtained by cutting one optical fiber by stress cutting, for example.
It may be a book or separate books.

The structure of the optical film 12 formed on the end face of the optical fiber 11 is selected according to its function, and is, for example, a multilayer filter, a polarizing film or a light absorbing film (light attenuating film). When the optical fibers 11 and 13 are placed in the V groove 22, their positions are uniquely determined, that is, the optical axes of the optical fibers 11 and 13 are aligned with each other. The position adjustment (alignment) work of is unnecessary in this example.

The V-groove 22 is used to fix the optical fibers 11 and 13 together.
The optical fiber 13 on the optical film 12 on the end face of the optical fiber 11
In the state where the end faces of the above are abutted, they are pressed by the pressing plate 23, and the pressing plate 23, the optical fibers 11 and 13, and the substrate 21 are bonded and fixed, for example.
FIG. 1B shows this fixed state, and in the figure, hatching indicates an adhesive. Silicon, glass, or the like is used as a constituent material of the substrate 21 and the pressing plate 23.

Next, an embodiment of the invention of claim 1 will be described with reference to FIGS. In this example, as shown in FIG. 2, the two optical fibers 24 and 25 to be connected are obtained by cutting one optical fiber 26 obliquely with respect to the axis. Blocks 27 each having a rectangular parallelepiped shape are previously attached to both sides of the cut portion of the optical fiber 26, and after the blocks 27 are attached, the blocks are obliquely cut by, for example, stress cutting.

In this example, the block 27 comprises a lower block 27a having a V groove 28 and an upper block 27b, and is made of, for example, glass or silicon. The block 27 is attached to the optical fiber 26 by disposing the optical fiber 26 on the V groove 28 and sandwiching the optical fiber 26 between the blocks 27a and 27b. The fixing is performed by adhesion.

After the optical film 12 is formed on the cut end face of one optical fiber 24, the optical fibers 24 and 25 are arranged in the V groove 22 of the substrate 21 as shown in FIG. Match. At this time, both blocks 27 are placed on the same plane as shown in the figure. This plane is constituted by the upper surface 29a of the base 29, and the substrate 21 is mounted on the intermediate portion of the upper surface 29a of the base 29.

By adopting the above configuration,
The rotation of the optical fibers 24 and 25 is restricted by the block 27, that is, the optical fibers 2 are blocked by both blocks 27.
Since the rotational deviations of the optical fibers 24 and 25 around the axis are prevented, the angular relationship between the optical fibers 24 and 25 around the axis before the cutting and separation is reproduced.
Rotational adjustment for matching the butting angles of 4, 25 is also unnecessary.

The optical fibers 24 and 25 are fixed to each other by pressing them with a pressing plate 23 and adhering and fixing them. Both blocks 27 are also adhesively fixed to the base 29. In the above example, the lower block 27a and the upper block 27
Although the optical fiber 26 is mounted so as to be sandwiched by the block 27 formed by b, the block may be made of resin, for example, and the optical fiber 26 may be embedded (insert molded) in the block.

[0017]

【The invention's effect】. As described above, according to the first aspect of the invention, in the connection of the optical fibers whose connection end faces are obliquely cut, it is possible to eliminate the need for the alignment work and the rotation adjustment for adjusting the butt angles. . Yo
Easy to assemble and inexpensive optical parts and their manufacturing method
Can be provided.

[Brief description of drawings]

FIG. 1 shows a proposed embodiment, A is an exploded perspective view,
B is a perspective view after assembly.

FIG. 2 is a diagram for explaining attachment of a block and cutting of an optical fiber in the embodiment of the invention of claim 1 ;

FIG. 3 is a perspective view showing an embodiment of the invention of claim 1 ;

FIG. 4 is a perspective view showing a conventional structure of an optical component.

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Claims (2)

(57) [Claims] 1. A first optical fiber and a second optical fiber obtained by obliquely cutting one optical fiber with respect to its axis, and forming a film on a cut surface of the first optical fiber. An optical film, a rectangular parallelepiped first block attached and fixed to the opposite side of the cut surface of the first optical fiber, and a rectangular parallelepiped attached and fixed to the opposite side of the cut surface of the second optical fiber. A second block having a shape of a circle, and the oblique cut surface of the second optical fiber is abutted on the optical film on the cut surface of the first optical fiber,
A substrate in which the first and second optical fibers are arranged in a V groove and pressed by a pressing plate to bond and fix the first optical fiber and the second optical fiber, the first block and the second 2. An optical component comprising: a block and a bottom surface of the substrate, the bottom surface of which is placed on each of the top surfaces of the blocks and bonded and fixed. 2. An optical film is formed on the end face of the first optical fiber, the second optical fiber is connected to the first optical fiber through the optical film, and the first and second optical fibers are connected. A method of manufacturing an optical component in which a connecting portion of an optical fiber is arranged and fixed in a V groove on a substrate, wherein a rectangular parallelepiped first block and a second block are attached and fixed to one optical fiber, The first block and the second block of the one optical fiber are obliquely cut and separated with respect to the axis of the optical fiber to separate the first optical fiber and the second optical fiber. The optical film is formed on the oblique cut surface of the first optical fiber, the first block and the second block are arranged on the same plane, and the optical film is formed in the V groove on the substrate. Projecting the first optical fiber and the second optical fiber, which are formed into a film, By arranging them together, the angular relationship around the axis center of the first optical fiber and the second optical fiber before cutting and separating is reproduced, and the first optical fiber and the second optical fiber which are butted to each other are reproduced. And a pressure plate are pressed on the substrate with a pressing plate to bond and fix them.