JPS615224A - Reflector angle adjustment device for optical components - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Industrial applications The present invention relates to optical components used in optical communications.

Conventional Structure and Problems There is a conventional structure as shown in FIG. 1 as an example of an optical component. The figure shows an optical demultiplexer for wavelength multiplexing transmission. In the figure, 1 to 3 are optical fibers, 4 is a focusing rod lens (hereinafter simply referred to as a lens), 5 is a dielectric multilayer filter, and 6 is a mirror.

If the light of wavelength λ1 entering from the optical fiber 1 located at a distance dl from the optical axis 7 of the lens 4 is coupled to the optical fiber 2 located also at a distance dl from the optical axis 7 of the lens 4, the wavelength λ
The dielectric multilayer filter 5 that reflects the light from the lens 4
is arranged perpendicularly to the optical axis 7 of.

On the other hand, the light of wavelength λ2 entering the optical fiber 1 is transferred to the lens 4
The optical fiber 3 located at a distance of d2 from the optical axis 7 of
When coupling the mirror 6 to the optical axis 7 of the lens 4,
Place it at an angle of θ.

Next, the position of the optical fiber from the optical axis of the lens and its inclination relationship with the filter and mirror will be briefly described.

Figures 2a and 2b show the inclination and position of the emitted light with respect to the optical axis when the light is incident parallel to the lens and when the light is incident at an angle, respectively.

If we use a lens with a periodic length of 1/4, the meridian ray (ma) is approximated by the following equation of IJ Fuchs.

Here, no represents the refractive index of the lens optical axis, and ψA represents the refractive index distribution constant.

For example, n in FIG. 1.6, detective 0.298
When using a lens of 126μ from the lens 40 light m7
The angle θ of the mirror 5 for outputting the light of λ2, which is incident from the optical fiber 1 separated by m, to the optical fiber 3 separated by 250 μm from the optical axis 7 of the lens 4 is approximately 1.07 degrees.

However, it is assumed that the medium between the lens end and the mirror surface and between the lens end and the end face of the optical fiber is filled with a medium having a refractive index of 1.6.

In manufacturing such an optical demultiplexer, as described above, the angles of the filters and mirrors must be adjusted to the optimum coupling state before installation. Although the figure shows one-dimensional adjustment, two-dimensional adjustment is required in actual problems.

Conventionally, such an adjustment method involves finding the optimal position by adjusting the angle in the X direction in the figure and the angle in the X direction perpendicular to the plane of breath. However, this method requires skill on the part of the manufacturer to find the optimal position.
Moreover, it was extremely troublesome even for experienced workers, and the time and labor costs were prohibitive.

OBJECTS OF THE INVENTION The present invention aims to facilitate the angle adjustment of filters, mirrors, etc. in the assembly of optical components.Constitution of the Invention A device for holding a reflector such as a filter or mirror, and a holding portion for the reflector. This device consists of a device that adjusts the angle in only one direction, and a rotating device that has a rotation center axis near the center of the filter or mirror surface, and is designed to find the optimal position by adjusting the angle in the direction and rotating it. be.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described based on the drawings. 3 and 4 show the principle of detecting the optimum coupling state of the present invention. Now, the optical fiber 12 located at an arbitrary distance d1 from the center of the lens axis 11 Let us consider the case where the optical fiber 13 is coupled to the optical fiber 13 located a distance d2 from the center of the optical fiber 13.

When the reflector 17 is tilted at an angle ψ1 and rotated once with respect to the axis 11 of the lens 14, the coupling position from the optical fiber 12 is as follows.
A circular locus 16 shown by the solid line in FIG. 3 is drawn. Since the optical fiber 13 does not exist on this trajectory, it is not coupled. Next, if the reflector is tilted by an angle ψ3 and rotated once in the same manner, a circular locus 16 shown by the dashed line in the figure is drawn. Since the optical fiber 13 does not exist on this trajectory, it is not coupled.

As described above, by increasing the inclination of the reflector 17 little by little and rotating the reflector 17 by one rotation for each inclination, the coupling position can be set on the end of the lens 14 so that it is symmetrical to the input fiber position with respect to the optical axis. 0 moving on a concentric circle centered at position 18
That is, it is possible to set the inclination of the reflector that couples any pair of optical fibers at the ends of all lenses 14.

Normally, the core diameter of the optical fiber used is 50 μm, and the position of the optical fiber with respect to the lens axis is approximately 0.5 mm (ψ
(for a 2mm lens), the tilt of the reflector is approximately 2~
It is 3 degrees or less. In order to find the optimal coupling position, the reflector is tilted every 0.5 degrees to find the vicinity of the optimal coupling position, and by changing only the tilt at that position, the optimal coupling state can be obtained.

FIG. 5 is a diagram showing an adjustment mechanism according to an embodiment of the present invention.

In the figure, 12.13 is an optical fiber, 1-Jj, Lenste, each optical fiber 12.13 is fixed at an arbitrary position at the end of the lens 14. 17 is a reflector, and each optical fiber 12. .13.

The reflector 17 is arranged on the member 19, and the stopper member 2
It is fixed at 0. Further, both sides of the member 19 have rotatable bearings 21.

The member 19 is a member 22 having a surface perpendicular to the lens optical axis.
On the other hand, it is supported by a bearing portion 21 so that the angle can be varied in one direction. The angle can be changed by a compression pipe 23 that always pushes the member 19 in one direction, and a micrometer 2.
This is done by adjustment I/J of the 4th grade.

The member 22 also has a motor 26 attached to the board 25.
is fixed to a support shaft 27, and rotates together with the rotation of the motor 26. That is, the reflector 17 attached to the part 19 tilted at a predetermined angle with respect to the member 22 is connected to the lens 14.
The lens rotates at a predetermined angle with respect to the optical axis 11 of the lens.

Incidentally, although not shown, the holding part of the lens 14 and the substrate 25
remains in the same position.

Effects of the Invention As described above, according to the present invention, adjustments can be easily made without requiring any skill. Although not described here, by using a means to automatically control the angle adjustment mechanism and rotation mechanism while detecting the optimum light output, mass production can be achieved and the cost of optical components can be reduced. 0 that is a thing

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of optical components, FIGS. 2a and 2b are optical path diagrams of meridian rays of a focusing Rondo lens, and FIG. 3 is a plan view showing the principle of detection of an optimal coupling state according to an embodiment of the present invention. Figure 4 is the third
The side view and FIG. 6 are perspective views of the angle adjustment mechanism of the present invention. 12.13・・Optical fiber, 14...Lens, 17
...Reflector, 23. Compression spring, 24. Micrometer, 26. Motor. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 Figure 3/6'' Figure 4 f/

Claims (1)

[Claims] A reflector is provided at the other end of the optical fibers coupled to one end of the lens, means for holding the reflector, means for tilting the reflector with respect to the lens end, and rotating the reflector with respect to the optical axis of the lens. 1. A reflector angle adjusting device for an optical component, comprising means for adjusting the reflector angle of an optical component.