JPH01277205A - Multilayered block and optical multiplexer/ demultiplexer - Google Patents

Abstract

PURPOSE:To unequivocally determine relations of the emitted light, which is multiplexed/demultiplexed in multilayered film filters, to the incident light by laminating parallel plane transparent plates with multilayered film filters among them and not only slicing laminated transparent plates with an arbitrary width perpendicuarly to the lamination face but also cutting them at a prescribed angle to the lamination face with an arbitrary width to obtain a transparent block. CONSTITUTION:With respect to a multilayered film block, parallel plane glass plates 1a, 1b, and 1c are laminated with multilayered film filters 2a and 2b among them, and laminated glass plates 1a, 1b, and 1c are sliced with a width (a) perpendicularly to the lamination face and are cut them at 45 deg. to the lamination face with a width (b) to obtain a glass block, and upper and lower faces of this cut glass block are cut perpendicularly to side faces, thereby constituting a rectangular parallelepiped-shaped glass block. Thus, composite rays of light are multiplexed and demultiplexed without adjusting multilayered film filters at all at the time of multiplexing and demultiplexing plural optical waves.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention provides a multilayer film block that is formed of a transparent body on which a multilayer film is deposited and that splits and multiplexes a large number of light waves, and a multilayer film block that includes the multilayer film block. Regarding optical demultiplexers and multiplexers.

(Prior Art) A conventional optical demultiplexer/multiplexer of this kind is shown in FIG. The same figure shows a schematic configuration diagram of a conventional optical demultiplexer/combiner. In the figure, the conventional optical demultiplexer/multiplexer has a housing (1d)
multilayer film filters (2a) and (2b) housed in and fixed by a fixing adjustment part (2c);
a), (2b), and a multilayer filter (2a)
, (2b) are emitted from optical fibers (4).
) Connecting parts (3a), (3b), (3
c).

Next, the operation and function of a conventional optical demultiplexer/combiner will be explained based on the above configuration. First, the incident composite light (wavelengths λ8, λ2) propagated from the optical fiber (4) is connected to the coupling part (3a).
The parallel light is made into parallel light and enters the first multilayer filter (2a). This first multilayer filter (2a) has a wavelength λ
Only the light of wavelength λ2 is reflected and enters the coupling part (3b), and the other light of wavelength λ2 is transmitted to the second multilayer filter (2b).
incident on . This second multilayer filter (2b) reflects the light of wavelength λ2 and makes it incident on the coupling part (3C).

The first and second multilayer filters (2a) and (2b)
is attached to the housing (1) after the incident angle and exit angle are finely adjusted in advance by the fixed adjustment part (2c) between the joint part (3a) and the joint parts (3b) and (3c). It is something.

[Problem to be solved by the invention]

Conventional optical demultiplexers/combiners are configured as described above, so it is necessary to precisely fine-tune the multilayer filter between the input section and the exit section. When applying waves, there is a problem in that the positions of a plurality of multilayer filters must be adjusted. Furthermore, it is necessary to assemble and adjust a large number of multilayer filters in a fine housing, which also poses the problem of an increase in the number of parts.

This invention was made in view of the above problems, and is a multilayer film that can split and combine multiple light waves without making any adjustments to the multilayer filter. The purpose is to obtain blocks and optical demultiplexers/combiners.

[Means to solve the problem]

The multilayer film block according to the present invention is produced by laminating parallel plane transparent plates through a multilayer film filter, cutting out the laminated transparent plates at a predetermined angle with respect to the laminated plane, and starting from the end face of the cut transparent block body. It has a configuration in which light is incident, separated by a plurality of multilayer filters, and each separated light is emitted from the other end face.

In addition, an optical spectrometer/combiner according to another invention is formed by laminating a plurality of parallel plane transparent plates and multilayer filters, and cutting the laminated plane at an angle corresponding to an arbitrary spectroscopy direction. A multilayer film block separates and combines the composite light, and each of the separated and combined light waves is optically combined with a gradient index lens and other optical systems. The configuration is such that the composite light from one optical system is split/combined and then emitted to another optical system.

[Effect]

In the multilayer film block according to the present invention, since a plurality of multilayer film filters are formed in parallel and integrally through parallel plane transparent plates, the incident light and the emitted light that has been demultiplexed and multiplexed by the multilayer film filter are separated. Determine the relationship uniquely.

Moreover, the optical demultiplexer/combiner according to another invention uniquely determines the exit angle of the output light that has been demultiplexed and multiplexed with respect to the incident light by a multilayer film block, and the cut end face of the multilayer film block It is coupled to other optical systems using a gradient index lens provided in the 100-degree refractive index lens to perform demultiplexing and multiplexing.

(Example) Hereinafter, an example of the present invention will be described based on FIGS. 1 and 2. FIG. 1 is a schematic configuration diagram of a multilayer film block according to this embodiment, and FIGS. 2(A), (B), and (C) are manufacturing process diagrams for manufacturing the multilayer film block shown in FIG. 1. In each of the above figures, the multilayer film block according to the present example is constructed by laminating parallel plane glass plates (la), (1b), and (1c) via multilayer film filters (2a) and (2b). The glass plates (1a), (ib), and (1c) are cut out perpendicularly to the laminated surface with a width a and at an angle of 45° to the laminated surface as a glass block. It consists of a rectangular parallelepiped glass block cut perpendicular to the side surface.

Next, the manufacturing process and operation of the multilayer film block according to this example based on the above configuration are shown in FIGS.
). First, multilayer filters (2a), (2b) are deposited on the surfaces of glass plates (1a), (1b) that have been optically polished to have parallelism on both sides, and the deposited glass plates (1a), ( 1b) and the glass plate (1c) with an adhesive having the same light transmittance and refractive index as the glass plate, and move the bonded glass plates (1a), (Ib), and (1c) in the direction of the arrow A. , -A, , A2 - Cut out at A2 (Figure 2 (A
)). This cut out glass block is further cut out in the arrow directions B, -8, and B2-82 at an angle of 45'' to the laminated surface (Figure 2 (b)). A multilayer film block is formed by cutting in the directions C+-Cz and C2-G2 (FIG. 2(C)).

The light entrance and exit surfaces of this multilayer film block are polished to improve coupling efficiency with other optical systems.

As shown in Fig. 1, the above multilayer film block receives composite light (wavelengths λ1, λ2, λ3) from the top surface, and reflects only the light of wavelength λ at the first multilayer filter (2a), while the others are To Penetrate. This transmitted composite light (wavelengths λ2, λ3) is the second
The multilayer filter (2b) reflects only the light of wavelength λ2,
Light of other wavelengths λ3 can be transmitted and the composite wave can be separated.

FIG. 3 is a schematic configuration diagram of an optical demultiplexer/combiner according to an embodiment of the second invention. In the figure, the optical demultiplexer/multiplexer according to an embodiment of the second invention is , parallel plane glass plate (1
a), (lb), (IC) and multilayer filter (2a),
(2b) and then cut out at an angle of 45° to the laminated surface to form a multilayer film block (1), and each multilayer film filter (2a), (2b) of the multilayer film block (1). Optical fibers (4
) coupled to gradient index lenses (3a), (3b),
(3C).

Next, we will explain the operation of the optical demultiplexer/multiplexer of this embodiment based on the above configuration.
The effect will be explained. First, composite light (wavelengths λ8, λ2, λ3) guided from the optical fiber (4) is incident on the gradient index lens (3a). This gradient index lens (3a) transfers the incident composite light to the multilayer film block (1).
The light is incident perpendicularly to the end face of the glass plate (1a). Of this perpendicularly incident composite light (wavelengths λl, λ2, λ3), only the light with wavelength λ1 is reflected by the first multilayer filter (2a) and is incident on the gradient index lens (3b). Light of(
Wavelengths λ2, λ3) are transmitted. This transmitted light (wavelengths λ2, λ3) is reflected by the second multilayer filter (2b), where only the light with wavelength λ2 is reflected, and the gradient index lens (3C
), and the remaining light (wavelength λ3) is transmitted. In this way, the composite light (wavelengths λ1, λ2, λ3) that is the incident light
The exit angles of light with wavelengths λl and λ2 are uniquely determined with respect to the incident angle of can be done.

In addition, in the embodiments of each of the inventions described above, the multilayer filter is configured to have two sheets, but it may also be configured using two or more multilayer filters. Further, in each of the above embodiments, the multilayer film block was constructed by laminating glass plates, but it can also be constructed from a transparent material such as other synthetic resin. Although the multilayer film block in the above embodiment was processed as a single block as shown in FIG. 2(C), it is also possible to process a plurality of blocks arranged in series. Alternatively, a bandpass filter can be deposited on the input and output surfaces of the multilayer film block. In this case, the extinction ratio can be particularly increased.

Furthermore, the gradient index lens can also be configured with a collimation lens that emits (or injects) incident light (or emitted light) as parallel light beams, or other optical systems.

〔Effect of the invention〕

As explained above, according to the multilayer film block according to the present invention, since the optical block is configured by integrally housing parallel multilayer film filters in a single transparent body, the multilayer film filter for incident light is This has the effect of being able to uniquely determine the relationship between the emitted light that has been demultiplexed and multiplexed.

According to another optical demultiplexer/combiner according to another invention, a gradient index lens is provided at each of the input and output parts of a multilayer film block formed by integrally fixedly housing parallel multilayer filters. As a result, assembly and adjustment with a plurality of other optical systems can be easily performed, and optical coupling with a plurality of other optical systems can be performed with high efficiency.

Further, the number of parts during assembly is reduced, and assembly and manufacturing can be easily performed.

[Brief explanation of the drawing]

゛Fig. 1 is a schematic configuration diagram of a multilayer film block according to an embodiment of the present invention, and Fig. 2 (A), (B), and (C) are respective manufacturing process diagrams of the multilayer film block diagram of Fig. 1. FIG. 3 is a schematic diagram of an optical demultiplexer/multiplexer according to another embodiment of the invention, and FIG. 4 is a schematic diagram of a conventional optical demultiplexer/multiplexer. (1) ---Multilayer film block, (1a), (1b), (1c)-"Glass plate, (2a)
, (2b)--multilayer filter, (3a), (3b)
, (3c) - gradient index lens, (4) - optical fiber. In addition, the same reference numerals in the figures indicate the same or corresponding parts. Patent applicant: Shimadzu Corporation (Figure 1)

Claims (2)

[Claims] (1) Parallel plane transparent plates are laminated via a multilayer film filter, and the laminated transparent plates are cut out to any width perpendicular to the laminated plane, and at a predetermined angle to the laminated plane to any width. A multilayer film block characterized by being composed of transparent blocks. (2) A multilayer film block formed by laminating a plurality of parallel plane transparent plates and multilayer film filters and cutting them out at a predetermined angle with respect to the laminated surfaces, and for each multilayer film filter surface of the multilayer film block, A light beam splitter characterized by having a configuration including a gradient index lens that is provided at each of the incident, reflected, and transmitted light input/output positions and couples the light in and out of the multilayer film block to another optical system. Wave/combiner.