JPS60409A - Sticking structure of optical transmission line parts - Google Patents

Abstract

PURPOSE:To adjust easily an optical axis and to execute sticking with a stable optical coupling degree by providing a recessed groove which a projecting part of desired number of optical transmission line parts being parallel to the optical axis is inserted through, and a recessed groove which a projecting part of optical function parts crosses the optical axis at a desired angle and inserted through, on a substrate. CONSTITUTION:Optical transmission line parts 14 are inserted into an axial core hole of housings 15a-15c consisting of a rectangular parallelepiped-shape glass of the same shape. Square-shaped projecting parts 16a-16c are formed in parallel to the axial core hole on the lower face of the housings 15a-15c. An optical filter element 10a is stuck to one side face opposed to a function parts body 18 consisting of a rectangular parallelepiped-shaped optical glass of optical function parts 17, and an optical filter element 10b is stuck to a position shifted in parallel to the element 10a on the other side face. On the lower face of the body 18, a square-shaped projecting part 19 is formed in parallel to the side face to which the element 10a has been stuck. Parallel recessed grooves 12a, 12b, and a recessed groove 13 crossing said grooves at a prescribed angle are formed on the upper face of a substrate 11. In this way, the optical axis of the parts 14, 17 is adjusted easily, and sticking is executed with a stable optical coupling degree.

Description

Detailed Description of the Invention (a) Technical Field of the Invention The present invention relates to an optical device including an optical transfer path component and an optical functional component, in which an optical fiber and a lens are optically coupled, and particularly relates to an optical device that includes an optical transfer path component and an optical functional component, in which an optical fiber and a lens are optically coupled. Regarding the fixing structure of parts.

(b) Background of the technology Optical transfer path components in which optical fibers and lenses are optically coupled are arranged facing each other as desired, and optical functional components such as optical filters and half mirrors are installed between the optical transfer path components. In optical devices such as wave transmitters, optical demultiplexers, optical couplers, and optical splitters, it is important for optical coupling efficiency to align the optical axis of the optical transfer path component with the optical axis of the optical functional component. It is.

These optical transfer path components will be explained with reference to the drawings.

FIG. 1 is a sectional view of an example of an optical transfer path component.

In FIG. 1, the optical transfer path component 1 includes a ferrule 3 in which the end of the optical fiber 2 is inserted into the axial hole, and a sleeve 5 in which the lens 4 is inserted into the axial hole. It is configured to be inserted facing the cardiac foramen. Note that the end face of the ferrule 3 on the lens 4 side is located at the focal point of the lens 4. Therefore, the projected light of the optical fiber 2 is converted into a parallel light beam by the lens 4, and the light beam that enters the lens 4 from the side opposite to the optical fiber 2 is focused, enters the optical fiber 2, and is transmitted.

Further, in order to easily attach the optical transfer path component 1 to a support plate of an optical device, the holding cylinder 6 is provided with a flange 6a whose end face is perpendicular to the axis, as necessary. There are parallel holes through which the mounting screws pass.

(C) Prior Art and Problems FIG. 2 is a perspective view of an optical demultiplexer, which is an example of an optical device equipped with the above-mentioned optical transfer path components.

In the figure, support plates 8a and 8b, on which optical transfer path components are mounted, are vertically provided on both sides of a substrate 7 made of a metal plate, facing each other. The support plate 8a and the support plate 8b are provided with insertion holes whose axes coincide with each other, and the end of the holding cylinder 6 is inserted into each insertion hole so that the end face of the flange of the holding cylinder 6 becomes the support plate 8a + The optical transfer path component 1a and the optical transfer path component 1b are mounted facing each other and in contact with the respective outer surfaces of the support plate 8b.

Optical transfer path component ICs are mounted on the support plate 8b in parallel with the optical transfer path component 1b at a desired distance at the same height.

An optical filter element 10a is attached to one of the opposing side surfaces of the functional component main body of the optical functional component 9 made of optical glass in the form of a rectangular parallelepiped, and an optical filter element 10a is attached to the other side in parallel with and offset from the optical filter element 10a as desired. An optical filter element 10b is attached at the position.

The optical functional component 9 includes an optical filter element 10a on the upper surface of the substrate 7.
is located on the optical axis of the optical transfer path component 1a and the optical transfer path component 1b, and is inclined at a predetermined angle with respect to the optical axis so that the optical filter element 10a side faces the support plate 8b and is, for example, soldered or bonded. It is fixed by adhesive or other adhesive.

With this configuration, when combined light of wavelengths λa and λb is projected from the optical transfer path component la to the optical functional component 9,
The light with the wavelength λa is transmitted through the optical filter element 10a and enters the optical transfer path component 1b, and the light with the wavelength λb is reflected by the surface of the optical filter element 10a toward the optical filter element 10b, and is further optically transferred to the optical filter element 10b. The light is reflected in the optical axis direction of the optical transfer path component IC and enters the optical transfer path component IC. That is, this optical device has a function as an optical demultiplexer.

However, it is difficult to machine the upper surface of the substrate 7 and the mounting surfaces of the support plates 8a and 8b to be accurately perpendicular to each other. Therefore, it is necessary to adjust the fixing surface of the functional component main body of the optical functional component 9 to make the reflected optical axis of the optical filter element and the optical axis of the optical transfer path component IC coincide, or to adjust the mounting angle of the optical transfer path component. The problem is that it does not. In addition, since the optical transfer path component has a structure in which the flange is fixed to the support plate,
This requires a wide mounting surface, which hinders miniaturization of optical devices. Furthermore, supporting plates are used to reduce the weight of optical devices.
If the substrate is made thinner, there is also the problem that when a tensile force is applied to the optical fiber of the optical transfer path component, the mounting angle of the support plate is distorted and the degree of optical coupling is deteriorated.

(d) Object of the Invention An object of the present invention is to provide a fixing structure for optical transfer path components that eliminates the above-mentioned conventional problems.

(e) Structure of the Invention In order to achieve this object, the present invention has a protrusion parallel to the optical axis on the lower surface of the housing of the optical transfer path component, and a protrusion parallel to the optical axis on the lower surface of the functional component body of the optical functional component. Protrusions parallel to the main body are formed, and on the upper surface of the substrate on which the optical transfer path component is attached to the periphery and the optical functional component is attached to the center, there are protrusions parallel to the optical axis direction of the optical transfer path component. A desired number of grooves into which the protrusions of the optical functional component are inserted, and a groove into which the protrusions of the optical functional component are inserted intersect with the optical axis of the optical transfer path component at a desired angle. The optical transfer path component and the optical functional component are fixed to the substrate after sliding adjustment of each protrusion within the corresponding groove.

(f) Embodiments of the Invention The present invention will be described in detail below with reference to illustrated embodiments.

FIG. 3 is a perspective view of one embodiment of the present invention.

In the figure, the optical transmission path component 14 is the same as the optical transmission path component shown in FIG. 1 without the flange. The optical transfer path components 14 each include a rectangular parallelepiped glass housing 15a,
It is inserted into the axial holes of 15b and 15c. A square protrusion 16a is provided on the lower surface of the housings 15a, 15b, and 15C.
They are formed parallel to the respective axial holes 16b and 16C.

An optical filter element 1 is disposed on one of the opposing sides of a functional component main body 18 made of rectangular parallelepiped optical glass of the optical functional component 17.
0a is attached, and an optical filter element 10a is attached to the other side.
The optical filter element 10b is placed at a position parallel to and shifted from the desired position.
is pasted.

A rectangular protrusion 19 is formed on the lower surface of the functional component main body 18, parallel to the side surface to which the optical filter element 10a is attached.

The width of the upper surface of the glass substrate 11 is the width of the protrusion 16a (16
b, the width of 16C is also the same)
6a, 16b, and 16c are inserted into two parallel grooves 12a at a predetermined interval.

12b is formed. Further, a groove 13 is formed in the center, intersecting the grooves 12a and 12b at a predetermined angle, into which the protrusion 19 of the optical functional component 17 is inserted. The above-mentioned predetermined intervals and angles are such that when the optical device is configured, the incident angle to the optical filter elements ioa and 10b and the reflected light from the optical filter element 10a are projected approximately at the center of the optical filter element 10b. Refers to interval and angle.

These grooves 12a, 12b, and 13 can be easily formed with two related angle positions and shapes with high precision using an etching method.

The optical transfer path component of the housing 15a is inserted into one end of the groove 12a, the optical transfer path component of the housing 15b is inserted into the other end of the groove 12a, and the optical transfer path component of the housing 15c is inserted into the groove 12b of the housing. 15b in parallel. In the optical functional component 17, the optical filter element 10a is connected to the housing 1.
The protrusion 19 of the functional component main body 19 is inserted into the groove 13 so as to face the protrusion 5b. Then, the functional component main body 18 is adjusted by sliding on the groove 13 so that the center of the optical filter element 10a is located on the optical axis of the optical transfer path component 14 of the housing 15a. The housing of the optical transfer path component 14 and the functional component body 18 of the optical functional component 17 are fixed to the substrate 11 by adhesive bonding, soldering, laser welding, or the like.

Just insert the protrusions into each groove as described above,
This is an optical demultiplexer that can easily align the optical axis of the optical transfer path component and the optical axis of the optical functional component.

Note that the substrate and the housing may be made of metal instead of glass, but glass or a dielectric material with a coefficient of thermal expansion close to that of glass is more reliable because it does not cause thermal distortion due to temperature changes.

Although the illustrated example is an optical demultiplexer, other optical devices such as optical multiplexers, optical splitters, optical couplers, etc. can be created by appropriately selecting optical functional components and selecting the mounting positions of optical transfer path components. It can be applied to

(g) Detailed Description of the Invention As described above, the present invention not only makes it easy to adjust the optical axes of the optical functional component and the optical transfer path component, but also allows the optical transfer path component to be directly mounted on the board. In practical terms, it is possible to reduce the component quotient and downsize, and also to stabilize the degree of optical coupling since there are no parts that deform even when tensile force is applied to the optical fiber of the optical transmission path component. This is an excellently effective fixing structure for optical transfer path components.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an example of an optical transfer path component, FIG. 2 is a perspective view of an optical demultiplexer as an example of a conventional optical device, and FIG. 3 is a perspective view of an embodiment of the present invention. In the figure, 1 and 14 are optical transfer path components, 2 is an optical fiber, 6 is a holding cylinder, 9.17 is an optical functional component, 10a10b is an optical filter element, 7 is 11 is a substrate, 12a+ 12b, 13
is a groove, 15a, 15b, 15C is a housing, 16a
, 16b, 16c, and 19 are protrusions, and 18 is a functional component body. Volume 1 Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] A protrusion parallel to the optical axis is formed on the lower surface of the housing of the optical transfer path component, a protrusion parallel to the functional component body is formed on the bottom surface of the functional component body of the optical functional component, and the optical transfer path is formed on the periphery of the optical functional component. The upper surface of the substrate on which the optical functional components are mounted in the center thereof is provided with grooves into which a desired number of protrusions of the optical transfer path components parallel to the optical axis direction of the optical transfer path components are inserted. and a concave groove into which the protrusion of the optical functional component is inserted, intersecting the optical axis of the optical transfer path component at a desired angle, and each protrusion is inserted into the corresponding concave groove. A fixing structure for an optical transfer path component, characterized in that the optical transfer path component and the optical functional component are fixed to the substrate after sliding adjustment.