Patent ID: 6968133
Filing Date: 2005-11-22
Classification: H04B

Abstract:
1. An optical free-space communication apparatus comprising: a first light-emitting source for emitting a first transmission optical beam having a plane of polarization in a predetermined direction, the first transmission optical beam being modulated according to a primary signal containing communication information; a second light-emitting source for emitting a second transmission optical beam having a plane of polarization perpendicular to the plane of polarization of the first transmission optical beam, the second transmission optical beam being modulated according to an auxiliary signal for angle detection; a transmitting optical system for emitting the first and second transmission optical beams out of said optical free-space communication apparatus as optical beams each having a predetermined angle of divergence; and driving means for redirecting the outgoing paths of the first and second transmission optical beams, wherein the second transmission optical beam has a larger angle of divergence than the first transmission optical beam.