JPS6060608A - Fixing method of optical fiber to optical connector - Google Patents

Abstract

PURPOSE:To prevent an optical fiber from shifting and reduce connection loss by tapering the connection-side end surface of the optical fiber insertion hole of a ferrule attached to an optical connector into a tapered opening part, fusing the projection part of the inserted optical fiber to a larger diameter, and then fixing the optical fiber in the opening part of the ferrule. CONSTITUTION:The tapered opening part 211 for inserting optical fiber core is formed in the connection end surface of the optical fiber core insertion hole 21 bored in the ferrule 2 made of ceramic, and said opening part 211 is made coincident with the connection side end surface of a connector 1. Then, an optical fiber 3 and an optical fiber core 31 are coated with an adhesive, the optical fiber core 31 is inserted into the optical fiber insertion hole 21 of the ferrule 2 until its tip part projects slightly, and the optical fiber 3 is also inserted into the ferrule insertion hole 11 of the connector 1 and adhered. The projection part of the optical fiber core 31 is heated near the ferrule 2 to form a larger-diameter core part 311, and the optical fiber 3 is drawn as shown by an arrow B and then the core projecting from the ferrule 2 is cut and polished.

Description

Detailed Description of the Invention (a) Technical Field of the Invention The present invention relates to a method for fixing an optical fiber and an optical connector,
In particular, it relates to a method of fixing an optical fiber and an optical connector to prevent the optical fiber from mechanically coming off the optical connector.

(bl Problems with the Prior Art Figure 1 is a side sectional view for explaining the conventional method of fixing an optical fiber and an optical connector. 1 is a connector, 2 is a ferrule, 3 is an optical fiber, and 11 is a ferrule insertion hole. , 2
1 is an optical fiber insertion hole, and 31 is an optical fiber core wire.

The ferrule 2 made of ceramic or the like is inserted and fixed into the ferrule insertion hole 11 of the connector 1 made of metal such as stainless steel so as to match the connection side end face of the connector 1. Apply adhesive to the optical fiber core 31 and attach it to the optical fiber core 31.
are inserted into the optical fiber insertion hole 21 of the ferrule 2, and the optical fiber 3 is inserted into the ferrule insertion hole 11 of the connector 1 and bonded. However, due to an external force applied in the axial direction of the optical fiber 3, the ferrule 2 and the optical fiber core 31 may be relatively misaligned. There was a problem in that the spacing changed and connection loss occurred.

(C) Purpose of the Invention In view of the above conventional problems, the present invention provides a novel optical fiber and optical connector fixing method that mechanically prevents relative displacement between the ferrule 2 and the optical fiber core 31. The purpose is to provide a method.

fdl Structure of the Invention In order to achieve the above-mentioned object, the present invention provides a method for inserting an optical fiber into a ferrule provided in an optical connector and fixing the optical fiber and the optical connector. A tapered opening is provided on the connection side end surface of the optical fiber insertion hole, the protrusion of the inserted optical fiber is melted to make the diameter thicker, and the thickened optical fiber is inserted into the opening of the ferrule. This is achieved by making it stick to the

(e+ Embodiments of the Invention Hereinafter, embodiments of a method for fixing an optical fiber and an optical connector according to the present invention will be described in detail with reference to the drawings.

FIG. 2 is a cross-sectional view in which ta+ is a partially melted optical fiber core wire that protrudes from an optical fiber inserted into an optical connector, for explaining an embodiment of the method for fixing an optical fiber and an optical connector according to the present invention. , (b) is a sectional view of a fused optical fiber core fixed to an optical fiber insertion hole.

(C) is a cross-sectional view of the protruding optical fiber core wire cut and polished. The same parts as the previous time are given the same reference numerals, 211 is the opening of the optical fiber insertion hole, and 311 is the large diameter optical fiber core wire. Department.

After forming a tapered optical fiber insertion hole opening 211 on the connection end surface of the optical fiber insertion hole 21 bored in the ferrule 2 made of ceramic or the like, the optical fiber insertion hole 21 is formed on the connection side end surface of the connector 1. After inserting and fixing so that the insertion hole openings 211 are aligned, adhesive is applied to the optical fiber 3 and the optical fiber core 31 to be inserted, and the optical fiber core 31 is inserted into the optical fiber insertion hole 2 of the ferrule 2.
1, the optical fibers 3 are inserted and bonded into the ferrule insertion holes 11 of the connector 1, respectively, with their tips slightly protruding.

Then, by heating the protruding portion of the optical fiber 31 near the ferrule 2, the optical fiber 31 is melted and a large diameter portion 311 of the optical fiber is formed due to surface tension. Therefore, when the optical fiber 3 is pulled in the direction of arrow B, the optical fiber large diameter portion 311 is caught in the optical fiber insertion hole opening 211 formed in the ferrule 2, and the second
It stops as shown in figure (b). If the optical fiber core 31 protruding from the ferrule 2 is cut and polished in this state, it will become as shown in FIG. 2 (C1).
Since the ferrule 1 will not be retracted from the ferrule 2 by external force, the optical fiber core wires 31 will come into close contact with each other when the optical connectors are connected.

([1 Effect of the Invention] As is clear from the above explanation, the method for fixing optical fibers and optical connectors according to the present invention combines mechanical and adhesive methods, compared to the conventional fixing method using only adhesive. By doing so, it becomes possible to significantly reduce connection loss, which greatly contributes to improving optical transmission characteristics.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view for explaining a conventional method for fixing an optical fiber and an optical connector, and FIG. 2 is a side sectional view for explaining an embodiment of the method for fixing an optical fiber and an optical connector according to the present invention. , (al is a cross-sectional view in which the optical fiber is inserted into the optical connector and the protruding optical fiber is partially melted, (b) is a cross-sectional view in which the melted part of the optical fiber is fixed in the optical fiber insertion hole, (C) is a cross-sectional view of a protruding optical fiber core wire cut and polished. In the figure, 1 is a connector, 2 is a ferrule, 3 is an optical fiber, 11 is a ferrule insertion hole, 21 is an optical fiber insertion hole, and 31 is an optical fiber core. The line 211 indicates the opening of the optical fiber insertion hole, and 311 indicates the large diameter portion of the optical fiber core.

Claims (1)

[Claims] A method of inserting an optical fiber into a ferrule provided in an optical connector and fixing the optical fiber and the optical connector is provided by forming a tapered opening on the connection side end surface of an optical fiber insertion hole bored in the ferrule provided in the optical connector. an optical fiber and an optical connector, characterized in that the protruding part of the inserted optical fiber is melted to increase its diameter, and the thickened optical fiber is fixed to the opening of the ferrule. fixing method.