Abstract: A permanent connector for optical fibers comprises a protective glass tube (2), a capillary tube (1) received therein and eccentrically joined thereto, the two tubes being made of ultraviolet-transmitting glass, and an adhesive-passing groove (1c) formed in the middle portion of the capillary tube (1) and opening on the side opposite to the side where they are joined together. An ultraviolet-curing type adhesive agent is charged into the permanent connector for optical fibers and the ends of optical fibers (3, 4) are inserted thereinto through the opposite ends thereof until the clads (3a, 4a) are butted against each other in the capillary tube (1) while pushing out the adhesive agent and air. And ultraviolet rays are radiated to cure the adhesive agent (6), thereby connecting the optical fibers (3, 4) together.

Abstract: An array splice for ribbon-like multi-core optical fibers comprises capillary tubes of ultraviolet-transmitting glass each having an inner diameter slightly larger than the outer diameter of the clad of an optical fiber, each glass capillary tube including tapered portions on the opposite ends thereof for insertion of optical fiber bodies, and a groove formed in the middle upper surface region thereof for discharging bubbles and adhesive agent, and a base including recesses formed in the middle upper surface region thereof for receiving and supporting the lower portions of the tube walls of the glass capillary tubes, and a plurality of front-edged separators each disposed at the opposite ends of the associated receiving and supporting recess. The separators are disposed with approximately the same pitch as that for the capillary tubes. Defined between adjacent separators are optical fiber insertion paths having a width which increases with increasing distances from the opposite ends of each capillary tube.

Abstract: An optical fiber fixing element consists of a glass tube having an inner hole for receiving a clad portion of an optical fiber and which is formed at one end with a conical flared portion converging into the inner hole and a recess for receiving a cover portion of the optical fiber thereinto, both the flared portion and the recess being formed concentrically with the glass tube. A method of manufacturing such optical fiber fixing element is also provided which comprises forming an erosion resistant film on an outer surface, other than an end face, of a glass tube having an inner hole, treating the end face of the glass tube with a glass erosive solution to thereby form a flared portion, and grinding the flared portion to thereby form a recess in the flared portion.