Light detection apparatus and free space optics...

Details Light detection apparatus and free space optics... Light detection apparatus and free space optics...

2004-12-08

2009-02-10

Wang, Quan-Zhen (Department: 2613)

Optical communications

Optical communication over freee space

Transceivers

C398S131000

Reexamination Certificate

active

07489871

ABSTRACT:
A free space optics communication apparatus which performs optical axis correction with high accuracy is disclosed. The free space optics communication apparatus of the present invention includes a first light receiving element and a second light receiving element, a light converging optical system which converges a light flux incident from the outside to form a spot of the light flux on each of light receiving surfaces of the first and second light receiving elements, and information producing section which combines outputs from the first and second light receiving elements to produce information on positions of the spots. The spots formed on the light receiving surfaces of the first and second light receiving elements have a point-symmetrical relationship.

REFERENCES:
patent: 5627669 (1997-05-01), Orino et al.
patent: 6956992 (2005-10-01), Coleman

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