Abstract: An integrated lens and positioning mechanism for an optical fiber involving a convex surface on a optically transparent precision collar formed around the end of the fiber. The optically transparent collar has an index of refraction less than or equal to that of the fiber's surface. The fiber extends through the collar and is located at the optical center of the collar. The convex surface focuses light on the optical fiber within the collar thus increasing the amount of light collected in the core of the fiber. The collar has specific dimensions to allow precise positioning in a suitable locating body. A stray light suppressor may be formed behind the collar along the optical path of the fiber to remove unwanted light.