Abstract: A fiber grinding process includes: contacting an end of the optical fiber with a grinding surface in such a manner that a central axis of the optical fiber at the end is inclined to the grinding surface; rotating the optical fiber about the central axis; and changing a contact pressure between the end of the optical fiber and the grinding surface by applying a variable torque while rotating the optical fiber. A substantially cone-shaped end face with a substantially elliptic cross-section may be produced. A fiber grinding apparatus is also disclosed.

Abstract: A fiber grinding process includes: contacting an end of the optical fiber with a grinding surface in such a manner that a central axis of the optical fiber at the end is inclined to the grinding surface; rotating the optical fiber about the central axis; and changing a contact pressure between the end of the optical fiber and the grinding surface by applying a variable torque while rotating the optical fiber. A substantially cone-shaped end face with a substantially elliptic cross-section may be produced. A fiber grinding apparatus is also disclosed.

Abstract: The present invention relates to a quadrangular-pyramid-shaped lensed fiber. One end of the fiber is ground to become quadrangular-pyramid-shaped. Small volume of the tip of the quadrangular-pyramid-shaped fiber is heated to form a semi-ellipsoidal microlens, thereby forming the quadrangular-pyramid-shaped lensed fiber. The advantage of the present invention is that the shape of the semi-ellipsoidal microlens can be controlled by adjusting the angles of the quadrangular-pyramid-shaped fiber according to the aspect ratio of the diode laser so as to enhance the coupling efficiency between an optical fiber and a diode laser.