Device for coupling single-mode optical fibers

DETAILED DESCRIPTION We claim: 1.
In a device for coupling single mode optical fibers through a collimated beam, wherein the light radiating outgoing from a first optical fiber (F1) is collimated by a first lens (02) on an end face of a second fiber (F2), the improvement wherein between said first and second lenses (01, 02) there are inserted: a glass plate (V) with plane and parallel surfaces adapted to be rotated around two perpendicular axes in a plane perpendicular to an optical axis of the device formed by a straight line traversing centers of said first and second collimating lenses (01, 02); and a positioning lens (L) adapted to be translated in a plane perpendicular to the optical axis above in to two mutually orthogonal directions.
2.
In a device for coupling single mode optical fibers through a collimated beam and having an optical axis, wherein the light radiating outgoing from a first optical fiber (F1) is collimated by a first lens (02) on an end face of a second fiber (F2), the improvement wherein between said first and second lenses (01, 02) there is inserted: a positioning lens (L), adapted to be rotated around two mutually perpendicular axes lying in a plane perpendicular to the optical axis of the device and to be translated in a plane perpendicular to the said optical axis in two mutually orthogonal directions.
3.
In a device for coupling single mode optical fibers through a collimated beam and having an optical axis, wherein the light radiating outgoing from a first optical fiber (F1) is collimated by a first lens (02) on an end face of a second fiber (F2), the improvement wherein between said first and second lenses (01, 02) there is inserted: a positioning lens (L), adapted to be rotated around two mutually perpendicular axes lying in a plane perpendicular to the optical axis of the device and to be translated in a plane perpendicular to the said optical axis in two mutually orthogonal directions, said positioning lens (L) and said glass plate (V) being held by a support made of a material easy to bend and twist to obtain an optimal coupling condition