JPS62168103A - Assembly type multiplexer demultiplexer - Google Patents

Abstract

PURPOSE:To reduce the size and cost of a multiplexer demultiplexer and to decrease the number of adjustment positions by combining a block which has plural lenses with a block which has one or more kinds of optical filter film on the same plane on glass. CONSTITUTION:Spherical lenses 10-1-10-4 are fixed in plural V grooves 15 of a supporting member 14, and three kinds of, two kinds of, and one kind of optical filter films (f) are formed on glass blocks 12-1, 12-2, and 12-3 respectively to form a filter block 13. When light with mixed wavelengths is made incident on the lens through an optical fiber 16, only light beam with a specific wavelength is reflected by each filter surface (f) while other light beams are passed, so that light beams with specific wavelengths are projected from the lenses 10-2-10-4. On the other hand, light beams with the specific wavelengths are made incident on the lenses 10-2-10-4 and multiplexed optically. Thus, a small-sized, low-cost optical demultiplexer which has a small number of adjustment positions is obtained.

Description

[Detailed Description of the Invention] [Summary] This is a collective type multiplexer/demultiplexer, which includes a lens block having a plurality of lenses whose mutual positions are fixed in relation to the human output of light, and one or more types of lenses on the same plane. By combining a plurality of glass blocks on which optical filter films are formed and a filter block that is bonded together, there is no need for adjustment, and it is possible to reduce the size and cost.

[Industrial application field]

The present invention relates to an optical multiplexer/demultiplexer used in optical communications and the like.

Currently, in optical communications, one method of multiplex communication is to perform multiplex communication by wavelength division. In this case, it is necessary to connect a plurality of optical fibers or a plurality of light emitting or light receiving elements to both ends of the transmission optical fiber via an optical demultiplexer or optical multiplexer on the transmitting and receiving sides.

[Conventional technology]

FIG. 3 is a diagram showing an example of a conventional multiplexer/demultiplexer.

As shown in the figure, a plurality of optical filter films 2-t each having a different transmission wavelength are formed on two opposing sides of a glass block 1.
2-4 are provided, and wavelengths λ1. λ2. λ
When the light of λ2 is incident on the optical filter film 2-I through the lens 4-1, only the light of λ1 is transmitted through the optical filter film 2-2, and the light of λ2. The light of λ3 is reflected, the optical filter film 24 transmits only the light of λ2 and the light of λ3 is reflected, and the optical filter film 2-4 transmits only the light of λ3 to perform optical demultiplexing. It is also possible to perform optical multiplexing by the opposite effect.

[Problem that the invention seeks to solve]

In the above conventional multiplexer/demultiplexer, individual lenses 4-I to 4
-4 to align the lens and the optical fibers 3-1 to 3-4, and then adjust the mutual alignment of the lenses 4-t to 4-4 and the glass block 1. There are many parts, and the optical filter films 2-4 to 2-4
Since it is necessary to individually adhere the glass blocks 1 to the glass block 1, the number of assembly and manufacturing steps increases, resulting in an increase in cost.

The present invention was created in view of these points, and an object of the present invention is to provide a multiplexer/demultiplexer that is small in size, has fewer adjustment parts, and is lower in cost.

[Means for solving problems]

Therefore, in the present invention, the lens block 1 has a plurality of lenses 10-1 to 10-4 whose mutual positions are fixed.
1, and one or more types of optical filter films f, ~r on the same plane.
A plurality of glass blocks 12-1 to 12 on which 6 is arranged
4 and a filter block 13 formed by joining together.

[For production]

By combining a lens block with multiple lenses whose mutual positions are fixed, and a filter block made by bonding multiple glass blocks with one or more types of optical filter films arranged on one surface. , the size can be reduced, the number of assembly steps can be reduced, and position adjustment of individual lenses can be omitted.

〔Example〕

1 and 2 are views for explaining the present invention in detail, with FIG. 1 being an assembled perspective view and FIG. 2 being an exploded perspective view. In both figures, 10-1 to 10-4 are lenses, 11 is a lens block, 12-3 to 12-1 are glass blocks, 13 is a filter block, and f, to f6 are optical filter films.

In this embodiment, a plurality of lenses 10-I to 1 are used as shown in FIG.
A filter block 1 consisting of a lens block 11 containing 0-4 and a plurality of glass blocks 12-+-IL3.
3 are combined and joined together. The lens block has a plurality of grooves 1 in the supporting member 14, for example, as shown in FIG.
5, and a spherical lens or gradient index lens 10 is provided in each groove.
-1 to 10-4 are used, and one or more types of optical filter films are formed on one surface of each of the glass blocks 12-1 to 12-3. For example, glass block 12-9 fl.

f2. f, three types, f4 for glass block 12-2
Two types of optical filter films ゜C6 and one type fb are formed on the glass block 12-3, and the optical filter film ``1'' reflects light with a wavelength λ1 (wavelength will be omitted hereinafter), and the optical filter film ``1'' reflects light with a wavelength λ1 (hereinafter the wavelength will be omitted).
The light of λ3 is transmitted, the optical filter film f2 passes only the light of λ2, the optical filter film f,3 transmits only the light of λ3, the optical filter film f4 reflects the light of λ2, and the light of λ3 is transmitted. death,
The optical filter film r5 has such characteristics as to transmit only the light of λ, and the optical filter film r6 reflects the light of λ3.

Glass block 1 with an optical filter film formed in this way
2-1 to 12-8 are joined together as shown in FIG. 1, and further combined with the lens block 11.

In this embodiment configured in this way, as shown in FIG. 1, the lens 10-4 has λ, λ2, . When mixed light of λ is input through the optical fiber 16, the lens 10-I refracts the light in the direction of the arrow and enters the filter block 13. The incident light passes through the optical filter film f at λ2. The light of λ is transmitted, and only the light of λ1 is reflected, refracted by the lens 10-z, and emitted to the outside.

λ2 transmitted through the optical filter weight. The light of λ3 passes through the optical filter tlI f 4, and the light of λ2 is reflected, and the reflected light λ2 passes through the optical filter film f2, is refracted by the lens l0-3, and exits to the outside. .

Furthermore, the light λ transmitted through the optical filter film f4 is reflected by the optical filter film f6, passes through the optical filters f and f3, is refracted by the lens 10-4, and is emitted to the outside. Optical demultiplexing can be performed in this way. In addition, if the light of λ1 is input from the lens 10-2, the light of λ2 is input from the lens 10-3, and the light of λ is input from the lens 10-4 to the filter block 13, an effect opposite to the above-mentioned optical splitting will occur. lens io-, to λ8. λ2. Light of λ3 is emitted and optical multiplexing is performed.

According to this embodiment, since the lens block and the filter block are fixed, the device is small and there are no adjustment points, so the cost can be reduced.

〔Effect of the invention〕

As described above, according to the present invention, the multiplexer/demultiplexer can be made smaller and lower in cost with an extremely simple configuration, and is extremely useful in practice.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention, FIG. 2 is an exploded perspective view showing an embodiment of the invention, and FIG. 3 is a diagram showing a conventional multiplexer/demultiplexer. 1 and 2, 10-1 to 10-4 are lenses, 11 is a lens block, 12-1 to 12-3 are glass blocks, 13 is a filter block, 14 is a support member, 15 is a groove; f and -f6 are optical filter films.

Claims (1)

[Claims] 1. Multiple lenses whose mutual positions are fixed (10_-
A lens block (11) having a lens block (11 to 10_-_4) and one or more types of optical filter films (f1 to f_4) on the same plane.
6) A plurality of glass blocks (12_-_
1 to 12_-_3) are joined to form a filter block (
13) A collective type multiplexer/demultiplexer configured by combining the following.