JPS5918914A - Coupler of optical fiber and photosemiconductor element - Google Patents

Abstract

PURPOSE:To enable easy assembling by providing a refractive index distributing type lens freely advanceably/retreatably in order to make the imaging point of the light beam of a photosemiconductor element coincident with the end face part of an optical fiber. CONSTITUTION:A photosemiconductor element 1 is mounted to a heat sink 2, and a lens 3 is fixed to a lens holder 4 and is screwed to a frame 5 to combine and fix the heat sink 2 and the frame 5. The forward end of an optical fiber 9 when a receptacle 6 is mounted to a frame 7 is adjusted by placing a knife edge 15 in the position of the forward end of a connector plug 10, placing a screen 14 behind the same, observing a light beam 11, and moving the lens 3 forward or backward by using a groove 4a and rotating the holder 4 to bring a beam west point 13 to over the edge 15. The holder 4 is then fixed by means of an adhesive agent. The frame 7 and the frame 5 are fixed to the heat sink 2, and a connector plug 10 is inserted into the receptacle 6, and is adjusted until the power in the fiber 9 is maximized, then the receptacle 6 is fixed by means of a screw 8 to the frame 7.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a coupler for efficiently coupling an optical fiber and an optical semiconductor element in optical fiber communication.

Optical semiconductor devices used as light sources for optical fiber communication, such as semiconductor lasers and light emitting diodes, have small light emitting parts and large divergence angles, and the size of the core part of optical fibers through which light is propagated also varies. From several μm to several tens of μm
m, which makes optical semiconductor devices and optical fibers more efficient (
In order to achieve this combination, it is necessary to select the lenses to be used and adjust the lenses with precision.

However, it is generally not easy to adjust the position of the lens in this way.

This invention addresses the above-mentioned problems, and provides a coupler of an optical 7 fiber and an optical semiconductor element that can be easily and easily assembled by using a means that can easily detect the focal point of a light beam. is intended to provide. Hereinafter, this invention will be explained with reference to the drawings.

1 to 3 show an embodiment of the present invention. FIG. 1 is a schematic perspective view showing each part separated, FIG. 2 is a perspective view of the lens holder, and FIG. 3 is a sectional view showing the assembled state of FIG. 1.

In FIG. 1, 1 is an optical semiconductor element such as a semiconductor sensor or a light emitting diode, 2 is a heat sink for the optical semiconductor element 1, 3 is a gradient refractive lens (hereinafter simply referred to as a lens), and 4 is a heat sink for the optical semiconductor element 1. A lens holder for attaching the lens 3, as shown in FIG. 2, a groove 4a is provided on the end surface,
A screw 4b is formed on the outer periphery. 5 is the lens boulder 4
A frame for adjusting the movement of the frame, with a screw hole formed inside.
The screw 4b of the lens holder 4 is screwed into this. Reference numeral 6 denotes a receptacle, and 7 a frame for accessing the receptacle 6. The receptacle 6 is attached to this frame 7 with screws 8. Figure 3 shows this assembled, with 9 being an optical fiber and 1o being a connector plug.

Next, the operation of this invention will be explained.

First, a method for adjusting the lens 3 will be explained with reference to FIG. The output light of the optical semiconductor element 1 is set to a predetermined value of 1? In order to form an image on l (the end surface of the optical fiber 9), it is necessary to accurately adjust the position of the lens 3.

Therefore, Fig. 4(a) shows a method of detecting the imaged point using a knife (for example, a razor blade).
This will be explained using (b).

The light beam 11 is cut off by the knife 15, and the judgment is made based on the beam image 16 behind it.
When viewing the beam image 16 reflected on the screen 14 placed behind the theater, the beam waist point (imaging point) 13 can be easily found in the direction in which the beam image 16 is cut off. For example, as shown in FIG. 4(a), if the knife 15 is moved perpendicularly to the light beam 11 behind the position of the beam waist point 13 (closer to the screen 14), the knife 15 is moved in the same direction as the moving direction of the knife 15. , Q on screen 14
) The beam image 16 is missing (on the other hand, if the knife image 15 is moved in front of the beam waist point 13 (closer to the light source) as shown in FIG. The noheem image 16 on the screen 14 is missing from the direction of the beam waist point 13.
When the beam image 16 is moved, the entire beam image 16 becomes uniformly dark.

Therefore, to adjust the imaging position, place the knife 15 at the desired imaging position and look for a point where the beam @ 16 on the screen 14 becomes uniformly dark as the knife 15 moves. When the beam image 16 fades from the same direction as the direction of movement of the knife 15, the lens 1
2 toward the light source, and conversely, if the moving direction of the knife 15 and the direction in which the beam image 16 is missing are the same, the lens 12 may be moved toward the screen 14 side.

Generally, the optical semiconductor device 1 used as a light control device for optical fiber communication has an infrared light region, and the image reflected on the screen 14 is not visible to the naked eye. Therefore, we will use an infrared scope to observe the image. The screen 14 may be observed from the side opposite to the optical semiconductor element 10.

Next, a method for assembling and adjusting the coupler of the optical fiber 9 and the optical semiconductor element 1 will be described using FIGS. 1 to 3.

The optical semiconductor element 1 is attached to the heat sink 2, and the lens 3
is fixed to the lens boulder 4 with adhesive or the like, screwed into the frame 5, and the heat sink 2 and frame 5 are combined and fixed. The expected tip of the optical fiber 9 when the receptacle 6 is attached to the frame 7, that is, in the case of FIG. 3, the receptacle 6
Place the knife 15 at the position of the tip of the connector plug 1o when it is inserted into the connector plug 1o, place the screen 14 behind it, observe the light beam 11, and make sure that the beam waist point 13 is on the nine edge 15. Rotate the lens bolt 4 along the groove 4a and shake the lens 3 back and forth. 1, and then fix the lens por die with 1m adhesive.

Next, the frame 7 is fixed to the frame 5 and the beam 1-sink 2, the connector plug 1o is inserted into the receiver 6, the receptacle 6 is slightly moved perpendicular to the light beam 11, and the optical fiber 9 is inserted into the frame 7. 2. Then, fix the receptacle 6 to the frame 7 with screws 8, etc. so that the power of

In the above embodiment, the optical semiconductor element 1 includes a light jx such as a semiconductor laser or a light emitting diode, and a 't7 fiber 9.
Although the case where the light from the nine fibers 9 is coupled is described above, it can also be applied to the case where the light from the nine fibers 9 is coupled to a light receiving element such as a photodiode or a seven-balanced photodiode.

This can be done by placing the knife 15 at the first position where the light receiving element is expected to be placed and adjusting the lens 3.

In addition, the single fiber 9 can be attached and detached using the connector plug 1o.
Although case B has been described, case C can also be used as is when the optical fiber 9 is integrated with the semiconductor element 1.

Furthermore, regarding the lens 3, although the case where a refractive index distribution type lens is used in the above embodiment has been described, it may be a normal micro optical lens or a ball lens.

Further, in the above embodiment, adjustment was made by rotating the lens holder 4 on which the screw 4b was formed, but the lens holder 4 may be configured to slide back and forth.

As explained above, according to the present invention, since the lens position can be adjusted using the knife,
It has the advantage that the device is simple and that high precision can be obtained.

[Brief explanation of drawings]

1 is a schematic perspective view showing each part of a coupler for an optical fiber and an optical semiconductor element separated, showing one embodiment of the present invention; FIG. 2 is a perspective view of the lens holder shown in FIG. 1; and FIG. The sectional view of FIG. 1 showing the assembled state and FIGS. 4(a) and (+)) are diagrams for explaining the adjustment principle of the present invention. In the figure, 1 is an optical semiconductor element, 3 is a lens, a 4-piece lens holder, 4B is Ml, 4b is a screw, 6 is a ν septum, 9 is an optical fiber, and 10 is a connector plug. Note that the same reference numerals in the figures indicate the same or similar parts. Agent Kuzu WP Shin - (1 other person) (Figure 3 Figure 4

Claims (1)

[Claims] In a coupler that couples an optical fiber and an optical semiconductor element using a gradient index lens, the gradient index lens is used in order to match the focal point of the original beam of the optical semiconductor element with the end face of the optical fiber. What is claimed is: 1. A coupler for optical fiber and optical semiconductor element, characterized in that the optical fiber and optical semiconductor element are provided so as to be freely forward and backward.