System and method for coupling an optical beam into a light receiver

A system for coupling at least one optical beam, each having an essentially or exactly elliptical beam cross section into a light receiver having an essentially or exactly circular light receiving cross section, the system comprising

• at least one optical beam entry port, each configured to provide an entry for each of the at least one optical beams into the system;
• an optical beam exit port, configured to provide an exit for the at least one optical beam out of the system for coupling the at least one optical beam into the light receiver, the optical beam exit port comprising a lens configured to perform a Fourier Transform;
• at least one optical beam deflector for deflection of an optical beam of the at least one optical beam;
• and
• an optical base element, at least one of the at least one beam deflector being directly fixed to the base element,
• wherein due to being fixed, the at least one directly fixed optical beam deflector is allowed to rotate around a rotation axis which rotation results in an additional deflection of the corresponding optical beam,
• wherein the corresponding at least one optical beam and/or its assigned optical beam entry port is further configured such that the semi-major axis of the elliptical cross section of the optical beam on a deflection surface of a respective optical beam deflector is oriented essentially or exactly parallel to the rotation axis,
• and wherein the at least one optical beam deflector is oriented such that, after having passed the optical beam exit port, the elliptical cross section of the at least one optical beam overlaps the circular cross section of the light receiver.