JPH01105208A - Forming method for fixed v-groove for multicore connection of optical fiber - Google Patents

Abstract

PURPOSE:To prevent the variance of a V-groove shape by forming a V-groove which becomes a basis on a substrate whose surface has been brought to smoothing finish, and inserting and fixing large and small square-shaped members into the V-groove. CONSTITUTION:A V-groove 2 which becomes a basis of depth H is formed on a substrate 1 whose surface has been brought to smooth finish. Subsequently, a square-shaped member 3A having a regular square cross section, whose diagonal dimension has been manufactured to the same dimension as the depth H of the V-groove 2, and square-shaped members 4B, 4B having a regular square cross section, whose diagonal dimension has been manufactured to 1/2 of the diagonal dimension of the square-shaped member 3A on both its sides are inserted and fixed successively, and four lines of V-grooves 4 are formed on the surface of the substrate 1. In such a way, the V-groove 4 of high accuracy being free from a variance is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a method of forming an optical fiber fixing V-groove used for multi-fiber connection of optical fibers.

``Prior Art'' As a method for accurately connecting a plurality of optical fibers to each other, there is a method in which the optical fibers are held and fixed in V-grooves arranged in a row on a substrate. In this method, extremely high precision is required in the machining of the grooves, since (1) the unevenness of the grooves has a large effect on the mutual axis misalignment of the optical fibers to be connected.

For this reason, conventionally, after smoothing the surface of the substrate, the substrate is set on a grinding machine equipped with an enlarged projector and enlarged and projected.
A paper pattern prepared according to this magnification was pasted on the projection surface to form a plurality of V-grooves on the surface of the substrate.

``Problems to be solved by the invention'' However, due to the grinding process, multiple V-stripes are formed on the surface of the substrate.
When grooves are arranged in rows, there is a problem that the cutting edge of the grindstone gradually wears out and becomes rounded during the process of the grinding fiO process, causing unevenness in the V-groove shape, such as the formation of an R surface on the bottom of the V-groove.

"Means for Solving the Problems" The present invention was made for the purpose of solving the above problems.
A basic V-groove is formed on a substrate with a smooth surface,
This method solves the problems of the conventional method by incorporating and fixing large and small square members with rectangular cross sections (including squares) into the V-groove, and arranging the required number of grooves on the surface of the substrate.

"Function" Since the V-grooves arranged in rows on the surface of the substrate are formed by the smooth surfaces of large and small square members, highly accurate V-grooves with no variation can be obtained.

"Example" Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is an explanatory diagram showing an embodiment of the method of the present invention.
A basic V-groove 2 having a depth H is formed on a substrate 1 whose surface has been smoothed by grinding, cutting, or the like. Next, a rectangular member 3A with a square cross section is fabricated with high accuracy so that the diagonal dimension is the same as the depth H of the V-groove 2, and on both sides of the rectangular member 3A, the diagonal dimension is precisely manufactured to be the same as the diagonal dimension of the rectangular member 3A. Four rows of V-grooves 4 are formed on the surface of the substrate 1 by fixing the fabricated rectangular members 4B, 4B with square cross-sections into the basic V-grooves 2 by a method such as adhesive bonding.

FIG. 2 is an explanatory diagram showing another embodiment of the method of the present invention. In this method, a substrate 1 with a smooth surface is ground,
After forming the basic V-groove 2 by a method such as cutting, square members 30 and 3D with a square cross section and a rectangular cross section are assembled in a predetermined order into the V-groove 2 and fixed by a method such as gluing. Three rows of V-grooves are formed on the surface of a substrate 1.

Although the method of forming four and three rows of grooves 4 on the surface of the substrate 1 has been illustrated and explained above, the method of the present invention is applicable to the basic V grooves formed on the substrate 1, as is clear from the above embodiments. By appropriately changing the shape and number of square members to be fixed in the groove 2 in a predetermined order, the required number of V-grooves 4 can be formed on the substrate 1.
Moreover, since the V grooves 4 arranged in rows on the surface of the substrate 1 are formed of the smooth surface of a rectangular member manufactured with high precision, highly accurate V grooves with no variations can be formed. A groove 4 is obtained.

"Effects of the Invention" According to the method of the present invention, a basic V-groove 2 is formed on a substrate l whose surface has been finished with a smooth finish as described above, and a large and small rectangular shape with a rectangular cross section (including a square) is formed in the V-groove z. The required number of grooves 4 can be arranged in a row on the surface of the substrate 1 by a simple operation of assembling and fixing the members in a predetermined order. Since it is formed from the smooth surface of a rectangular member manufactured with high precision, it has the excellent advantage of being able to obtain highly accurate grooves 4 with no variation.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing one embodiment of the method of the present invention, and FIG. 2 is an explanatory diagram showing another embodiment of the method of the present invention. 1: Board 2: Basic V groove 3A, 3B,
30.3D: Square member 4: V-groove Patent applicant Furukawa Electric Co., Ltd. Representative Patent attorney Oka 1) Kikuji No. 1
Figure rod 2 figure

Claims (1)

[Claims] A basic V-groove is formed on a substrate with a smooth surface,
A multicore optical fiber characterized in that large and small square members with rectangular cross sections (including squares) are assembled and fixed in the V-groove in a predetermined order, and a required number of V-grooves are arranged in a row on the surface of the substrate. How to form a fixed V-groove for connection.