Ferrule for optical fiber, method of manufacturing the same, and optical connection using the same.

摘要

An optical fiber assembly is disclosed, which permits reduction of light reflection, suppression of reflected return light and reduction of connection loss and also facilitates its manufacture. The optical fiber assembly 10 comprises an optical fiber 14,15 and a ferrule 12 with an end taper TP and mounted on an end portion of the optical fiber. The end face of the optical fiber and the end face of the ferrule 12 are constituted by a convex spherical surface S1 with the center P0 thereof at a position spaced apart from the center line L0 of the optical fiber. The radial line L1 passing through the center P1 of the optical fiber and the center P0 makes an angle theta #NUM min NUM# of 6 to 12 degrees with respect to the center line L0, the radius of curvature is 50 to 70 mm, and the symmetricity angle DELTA theta is 0.1 degree or less. With this structure, it is possible to reduce light reflection, suppress reflected return light and suppress the connection loss. The optical fiber assembly thus is useful for optical switch directional couplers, amplifiers and so forth used for high speed signal transmission systems.