A surface mount optical coupler includes a silicon substrate; an optical semiconductor device disposed on an upper surface of the silicon substrate; and a short bare fiber formed of vitreous silica. A V-shaped linear groove is formed in the upper surface of the silicon substrate. The V-shaped groove extends from one end surface of the silicon substrate toward a light emitting surface of the optical semiconductor device in a direction perpendicular to the light emitting surface. Further, the V-shape groove supports the short bare fiber. The short bare fiber has one end surface optically coupled with a light emitting portion of the light emitting surface. The short bare fiber has a length smaller than that of the V-shaped groove.