Abstract: A structure and a method for coupling an optical semiconductor and an optical waveguide with high accuracy and productivity is disclosed. The semiconductor is mounted on a first substrate which is formed with a groove. A short optical fiber is received in the groove such that it is positioned at the same height as the light emitting portion of the semiconductor. The waveguide is formed on a second substrate while a groove is formed in the second substrate on the imaginary extension of the waveguide. The upper half of the short fiber is received in the groove of the second substrate, so that the fiber and waveguide are coupled to each other. To position the semiconductor relative to the first substrate, marks are provided on the mounting surface of the semiconductor and the surface of the first substrate and implemented by thin films which are opaque for infrared rays.

Abstract: Optical coupling equipment of the invention for an optical semiconductor and an optical fiber comprises a optical semiconductor, an optical fiber optically coupled to the semiconductor, and a refraction index matching substance filling the space between the semiconductor and the fiber. The refraction index matching substance has a refraction index greater than 1 and smaller than the refraction index of the core of the fiber. The optical distance between the ends of the semiconductor and the fiber with the ends of convex tip changes in association with the refraction index of the refraction index matching substance. In the differences in refraction index between the core of the fiber, as measured on the convex tip, and the outside decreases, the position of the focus of the convex tip changes. Furthermore, if the substances exists outside the active layer, the radiation angle of the laser diode also decreases.

Abstract: An optical fiber terminal capable of automatic assembly is disclosed. The terminal includes a ferrule of substantially cylindrical shape provided with a bore directed generally longitudinally to guide an optical fiber and with at least one projection on the outer periphery of the ferrule, a housing for receiving the ferrule made up of sections of a longitudinally cut tubular member with the inner periphery having a configuration which permits the ferrule to be held longitudinally slidably and a stopper to define the most forward position of the projection of the ferrule, and at least one resilient member which resiliently forces the projection of the ferrule forward with respect to the housing.

Abstract: A ferrule for an optical connector is of glass which is strengthened by ion-exchange.

Abstract: An optical connector ferrule comprises a capillary member, and a ferrule body. The capillary member is provided with a straight bore communicating from one end to the other end, and with a first slit and a second slit, respectively, for communicating the straight bore to the external of the capillary member. An auxiliary optical fiber is fixed in the straight bore of the capillary member, such that one end of the auxiliary optical fiber is aligned with the one end of the capillary member, and the other end of the auxiliary optical fiber is positioned on the central point of the first slit which is positioned on a side of the one end of the capillary member. An optical matching material is filled from the first slit into a portion of the straight bore which is limited by the second slit, thereby covering the inserted end of the auxiliary optical fiber. The capillary member is fixed in the ferrule body.