JPS5946616A - Processing method of optical fiber terminal - Google Patents

Abstract

PURPOSE:To reflect the incident light of an optical fiber and to converge the light, which is emitted from a spherical face, to a prescribed position, by processing the terminal of the optical fiber into the spherical face and grinding the spherical face at a prescribed angle and coating the ground face with a reflective film. CONSTITUTION:The terminal of the optical fiber is formed to the spherical face, and this spherical face 10 is polished with a plate including a core 4 at an angle theta to an optical axis 5. A ground face 6 is coated with a reflective film 7. Consequently, the characteristic of a convergent lens is given to the terminal as the result. The incident light propagating in the core 4 reaches the ground face 7 and is reflected by the reflective film 7 and reaches the spherical face on the side opposite to the reflective film 7 through routes indicated by arrows 2 and 1. In this case, the light is not totally reflected but is all transmitted through the spherical face. This light is converged and is focused on a surface 9 of a semiconductor optical element 2. That is, most of the light incident to the optical fiber is condensed onto the surface 9.

Description

Detailed Description of the Invention (a) Komei's Technology
Use the processing method at the end of A.

(b) Semiconductor optical technology and problems with conventional technology;
When processing the end of the optical fiber, polish the end of the optical fiber at a constant angle of I9T with respect to the optical axis of the optical fiber,
A reflective film is provided on the surface of the optical fiber, and the light incident from the other end of the optical fiber is reflected by the reflective film and emitted from the terminal J.
Q: Irradiating Outgoing Light to a Semiconductor Element FIG. 1 shows a conventional coupling between an optical fiber 1 and a semiconductor optical element 2. In the figure, light 3 propagates through the core 4 of the optical fiber 1.

The end portion of the optical fiber 1 is polished at a fixed angle θ of 7'5 with respect to the optical axis 5 of the optical fiber 1, as shown in the figure, to form a polished surface 6. Reflection 11 on the Kenreki surface 6! ,! 7 to reflect the light propagating through the core 4 at an angle O. The reflected light is incident on the surface 9 of the semiconductor optical device 20 with eight branches.

In this case, the outgoing light 7 from the optical fiber 1 has the disadvantage of being diverged to the outside, resulting in loss. In order to resolve this problem, a condensing lens is inserted between the optical fiber 1 and the semiconductor optical device 2 to prevent the above-mentioned divergence of light.

However, inserting a condensing lens between an optical fiber and a semiconductor optical device requires highly sophisticated technology and requires a lot of man-hours, resulting in the disadvantage of increased product costs. In order to solve this problem, the optical fiber terminal is processed into a spherical surface, the spherical surface is polished to a predetermined angle, and the polished surface is coated with a reflective film so that the light incident on the optical fiber is reflected by the reflective film and further The object of the present invention is to provide a novel optical fiber terminal processing method in which light emitted from a spherical surface is focused at a predetermined position.

(d) Structure of the Invention In order to achieve the above object, the present invention processes the n1 end of one side of an optical fiber into a spherical shape, and forms a part of the spherical surface at a predetermined angle with respect to the optical axis of the optical fiber. The optical fiber is polished to form a slope including the core, a reflective film is formed on the polished slope surface, and a means for reflecting light incident from the other end of the optical fiber on the reflective surface is provided. The reflected light is focused at a fixed position on the spherical surface opposite to the reflecting surface and is focused at a fixed position. I will explain.

FIG. 2(a) is a diagram in which the optical fiber terminal is formed into a spherical shape by discharge machining. FIG. 2B shows a view in which the spherical surface 10 is polished at an angle θ with respect to the optical axis 5 at a surface including the core 4. The polished surface 6 is coated with a reflective film 7. By processing the terminal into a spherical shape in this manner, it is possible to give the terminal the characteristics of a converging lens, and as a result, light entering or exiting from the spherical surface can be received and transmitted with little loss.

FIG. 3 shows the optical path of an optical fiber whose end has been processed in an embodiment of the present invention. The light incident from the other end 11 of the optical fiber propagates through the core 4 and reaches the polished end face 6, where it is coated with a reflective film 7.
and reaches the spherical surface on the opposite side of the reflective film 7 along the paths indicated by the arrows 2 and 1.

At this time, the light beam is totally reflected by the spherical surface! First, everything is transparent. Furthermore, since the spherical surface has the characteristics of a convex lens, these lights are converged and focused on the surface 9 of the semiconductor optical device 2. That is, most of the light incident on the optical fiber is on this surface 9.
(less loss).

FIG. 4 shows another embodiment of the present invention in which the semiconductor optical device 2' is a light emitting device.0 Light emitted from the surface of the light emitting device 2 travels in a course opposite to the light path shown in FIG. 3 above. .

That is, the light on the surface q of the light emitting element passes through the sphere (i'nlO) and is reflected by the reflective film, and most of the reflected light is transmitted through the core 4 of the optical fiber 1 and is emitted from the optical fiber 1 as the output light 11. 0 (f) As described in detail, according to the present invention, by processing the optical fiber terminal into a spherical shape, the multiplier lens characteristic 1'1. The light emitted from the surface has the advantage of being able to enter or receive light from the semiconductor optical element in contact with the terminal with little loss.

[Brief explanation of drawings]

Fig. 1 shows a conventional optical fiber terminal and a semiconductor optical device, Fig. 2 shows an optical fiber terminal according to the present invention, Fig. 3 shows an embodiment of the present invention, and Fig. 4 shows another embodiment. show. In the figure, 1 is an optical fiber, 2.2' is a semiconductor optical device, 3 is incident light, 4 is a core, 5 is an optical axis, 6 is a polished surface, 7 is a reflective film,
8 is light, 9.9' is the surface of the semiconductor optical device, 10 is a spherical surface,
Reference numeral 11 indicates outgoing light.

Claims (1)

[Claims] 9:b on one side of the optical fiber! Process the end into a spherical shape and polish a part of the 100 m1 spheres so that it becomes a surface containing the core of the nuclear optical fiber at a constant angle to the optical axis of the optical fiber,
A reflective film is formed on the n- surface of the optical fiber 17 to allow human radiation from the other end of the optical fiber. The optical fiber fin is characterized in that the reflected light is emitted from a spherical surface opposite to the reflective surface and is multiplied to a predetermined digit 1+, +. End processing method.