| 摘要 |
A laser communication system with improved reliability and exceptionally low bit error rate. The proposed laser communication system completely eliminates the effects of turbulence and provides free space performance. In addition, in the case of a modulatable retro-reflector the proposed system minimizes laser energy loss. These objectives are achieved by transmitting a focused laser beam to a receiver so that the focused beam waist is located entirely within the aperture of the receiver where the aperture size exceeds the effective spot size of the beam including effects of diffraction, atmospheric turbulence, and beam pointing error. In a preferred embodiment an imaging tracker at the transmitter and a laser beacon with a diverging beam at the receiver permits the transmitter to point a focusing beam accurately enough to assure that the entire beam is captured in the receiver aperture. In another embodiment a laser beam is transmitted from a first location to a modulatable retro-reflector at a second location. The beam transmitted from the first location is focused within the aperture of the retro-reflector. This beam may be sampled at the second location for communications from the first location to the second location. The retro-reflector is modulated for transmission of information from the second location to the first location.
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