JPS6369734A - Method for fixing optical fiber - Google Patents

Abstract

PURPOSE:To conveniently and firmly fixing optical fiber by bonding at a low cost with reduced strain and deformation, by drying a metal alkoxide sol coated between optical fiber and a glass substrate, gelling the sol, and vitrifying the gel by local heating to fix the fiber by bonding. CONSTITUTION:A gelled metal alkoxide 3 is coated between the glass fiber 1 and the substrate 2 made of quartz glass to cover the optical fiber 1 in the form of a strip, dried, and gelled. The gel is locally heated by high-output gaseous CO2 laser or a small-sized heater. Consequently, the gelled metal alkoxide having the composition similar to those of the optical fiber 1 and the substrate 2 is heated and vitrified. The optical fiber 1 made of quartz glass and the substrate 2 are firmly bonded and fixed, and quartz glass of the same composition is formed. The fiber can be conveniently bonded and fixed at a low cost with reduced strain and deformation.

Description

[Detailed Description of the Invention] [Summary] In a method for fixing an optical fiber to a glass substrate, a metal that, when vitrified, becomes a material with a composition similar to that of the optical fiber and the material of the substrate to which the optical fiber is adhesively fixed is used. By using alkoxide, the optical fiber can be firmly adhesively fixed to the substrate with less distortion and deformation.

[Industrial application field]

The present invention relates to a method for adhesively fixing an optical fiber to a glass substrate, for example in an optical communication component.

Optical components are made by bonding and fixing optical fibers directly to the substrate due to the need to downsize them and reduce manufacturing costs, but this method does not cause distortion or deformation and does not impair optical transmission characteristics. A fixing method is required.

(Prior art) Conventionally, as shown in the perspective view of FIG. In the fb1 figure, a metal coating 5 is formed on the surfaces of the optical fiber 1 and the substrate 2 by electroless plating or metal vapor deposition.
There are several methods of attaching and fixing with solder.

[Problem that the invention seeks to solve]

However, according to the above methods, the method using adhesive takes time to dry and harden, and the heat resistance and moisture resistance are insufficient, and the method of attaching a metal film to the surface requires metallization treatment. There is a risk that the structure may be distorted or deformed depending on the temperature at which it is applied, and there are also problems such as considerable cost for metallization.

The present invention provides an optical fiber fixing method that solves the above problems.

[Means for solving problems]

The above-mentioned problems with the conventional method are solved by applying metal alkoxide in a sol state between the optical fiber and the substrate, drying it to a gel state, and then vitrifying the metal alkoxide with local heating and fixing it with adhesive. be done.

[Effect]

Metal alkoxide in a sol state vitrifies at a temperature of about 500°C, which is lower than the normal glass melting point of about 1500°C, so it is possible to bond the optical fiber to the substrate by local heating using a low-power 002 gas laser with less thermal influence. Can be fixed.

[Example] The gist of the present invention will be specifically explained below with reference to an example shown in the drawings.

As shown in the perspective view of FIG. 1, a metal alkoxide 3 in a sol state is placed between an optical fiber 1 and a substrate 2 made of quartz glass in FIG. After drying to form a gel state, the gel state is vitrified by local heating using a low-power CO2 gas laser or a small heater, and the optical fiber 1 is adhesively fixed to the substrate 2.

The metal alkoxide 51 (OR) 4, which has a composition similar to that of the optical fiber 1 and that of the substrate 2, is heated and vitrified, and the optical fiber 1 made of quartz glass and the substrate 2 are firmly adhesively fixed to form a homogeneous material. The quartz glass becomes 8°0□.

〔Effect of the invention〕

As detailed above, according to the present invention, by using a material with a composition similar to that of the parts to be fixed for the adhesive, avoiding thermal effects due to differences in thermal expansion, and heating at a low temperature, there is little distortion or deformation, and the Can be fixed easily and inexpensively with adhesive.

In addition, since it is in a sol state, it has fluidity, and has extremely useful effects in practical use, such as fitting into small gaps and firmly adhering and fixing even minute parts.

[Brief explanation of the drawing]

FIG. 1 al, (b) is a perspective view of an embodiment according to the present invention, FIG. 2 (al, (b) is a perspective view according to the prior art,
It is. In the figure, 1 is an optical fiber, 2 is a glass substrate, 3 is a metal alkoxide, and a second perspective view according to the prior art.

Claims (1)

[Claims] A metal alkoxide (3) in a sol state is applied between an optical fiber (1) and a glass substrate (2), dried to form a gel state, and then the metal alkoxide (3) is applied by local heating.
3) An optical fiber fixing method characterized by vitrifying and adhesively fixing.