| 摘要 |
A spatial optical transmission device and method of spatial optical transmission of a beam type that allow tracking of a light beam by simple control. A plurality of divergent type tracking beams (X1) are emitted from a transmitter (10), and from the distribution of the optical intensity of each of these tracking beams the positional difference between a tracking beam receiver (22) and a datum point is detected, this error information is transmitted from a receiver (20) to the transmitter (10), and using lenses (11, 13), the directions of the optical axes of the tracking beams are changed, and at the same time the direction of the optical axis of a data beam (40) is adjusted.
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