JPS6323686Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to optical device parts used in optical devices such as optical branching/combining devices and optical demultiplexing/combining devices.

[Conventional technology]

Conventionally, the holding mechanism of an optical filter used when branching or demultiplexing light is, for example, a fourth
As shown in the figure, an optical filter 8 having a dielectric multilayer film deposited thereon, such as a semi-transparent film or an interference filter, is attached to a mirror frame 7 depending on the purpose. In FIG. 4, dotted lines indicate holes for securing an optical path.

[Problem that the invention attempts to solve]

However, conventional optical filter holding mechanisms have the drawback that positioning the mirror frame 7 is extremely difficult and requires many steps, and the device itself cannot be made compact in size due to position adjustment. Ta.

Therefore, the object of this invention is to provide a component for an optical device that can easily determine the position of an optical filter, reduce adjustment costs, and provide an optical device with high performance.

[Means for solving problems]

In order to solve the above-mentioned problems, this invention has decided to adhere an optical filter to the end face of a processed cylindrical member as a mechanism for holding the optical filter. The cylindrical member has a cut surface that intersects at a predetermined angle with respect to its central axis, and an optical filter such as a half mirror is adhered to the cut surface,
A through hole is formed from the cut surface to the side surface in order to secure an optical path when used in an optical device such as an optical splitter.

〔Example〕

Examples of this invention will be described below based on the drawings. In FIG. 1, a cylindrical member 1 is provided with a cut surface 3, and the central axis of the cylindrical member 1 and the cut surface 3 are
The angle it makes is exactly 45°. A half mirror 2 on which a dielectric multilayer film is vapor-deposited is adhered to the cut surface 3, and a through hole 4 is formed from approximately the center of the cut surface in a direction perpendicular to the central axis of the cylindrical member 1.

Next, a case where this embodiment of the invention is actually used in an optical splitter will be explained with reference to FIG. Housing 9 having two through holes orthogonal to each other
Collimators 10 and 1 are installed in three of the through holes of
1 and 12 are precisely fitted, and the optical device parts 1 and 2 according to this invention are precisely fitted in the remaining one position. That is, since the outer diameter of the cylindrical member 1 according to this invention and the hole diameter of the housing 9 are approximately equal, the cylindrical member 1
The central axis of coincides with the central axis of the hole in the housing 9. As a result, the surface of half mirror 2 is accurately aligned with the through hole.
In order to maintain the angle of 45°, the light emitted from the optical fiber 13 and reflected by the half mirror 2 enters the optical fiber 14 without loss.

Another embodiment of this invention will be explained with reference to FIG. In this embodiment, a chamfered portion 5 is formed at an angle of 45° with respect to the cut surface 3 and parallel to the central axis of the cylindrical member 1. By providing this chamfered portion 5, it becomes possible to more accurately control the angle formed between the central axis of the cylindrical member 1 and the cut surface 3. With the structure shown in FIG. 1, it is actually very difficult to measure the angle between the central axis of the cylindrical member 1 and the cut surface 3. However, exactly
By cutting the cut surface 3 and the chamfered portion 5 at the same time with a cutting tool having two blades forming an angle of 45 degrees, the angle can be easily controlled. Since the parallelism between the central axis of the cylindrical member 1 and the chamfered portion 5 can be easily measured, accurate angle control is possible. Accurate angle control enables the realization of an optical splitter with better performance (less loss).

FIG. 3 shows another embodiment of this invention, in which a female thread 6 is cut from the uncut surface of the cylindrical member 1 parallel to the central axis of the cylindrical member 1. In fact, when assembling the optical splitter, it is necessary to adjust the angle (45 degrees) of the cut surface of the cylindrical member 1 at the same time as accuracy. The degree of freedom of adjustment is
As shown in FIG. 6, the direction of the central axis of the cylindrical member 1, the direction of rotation when the central axis is the rotation axis, and 2
There is one. Adjustments are made in these two directions, and when the amount of light incident on the optical fiber 14 reaches its maximum,
A method of fixing optical device components according to this invention is used. For this adjustment, as shown in Fig. 6, attach the male thread 16 to the female thread 6,
Adjustment is made via the male screw 16.

Although the case where this invention is used in an optical splitter has been described above, it may also be used in an optical splitter or other optical device. The half mirror may be any other optical filter such as an interference filter, and the cut surface is not limited to 45°.

[Effect of idea]

As explained above, according to this invention, it is possible to easily position the optical filter, and an optical device suitable for mass production and having high performance can be provided.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of an optical device component according to this invention, Fig. 2 is a perspective view of another embodiment according to this invention, and Fig. 3 is a sectional view of another embodiment according to this invention. , FIG. 4 shows an embodiment of a conventional optical filter holding mechanism, and FIGS. 5 and 6 show examples of use of the optical device parts according to this invention. 1... Cylindrical member, 2... Half mirror, 3...
Cut surface, 5...chamfered part, 6...female thread.

Claims (1)

[Claims for Utility Model Registration] (1) A cylindrical member whose one end is cut obliquely to the central axis and a through hole is drilled from the cut surface to the side surface, and the cut surface of this cylindrical member. and an optical filter bonded to the cylindrical member, the part has an angle with the cut surface that is the same as the angle between the cut surface and the central axis of the cylindrical member, and an angle with the central axis of the cylindrical member. An optical device component characterized by having parallel surfaces. (2) The optical device component according to claim 1, wherein a female thread is cut parallel to the central axis from an end surface opposite to the cut surface.