Method of evaluating free-space optical propagation characteristics
AssigneeCommunications Research Lab. Indep. Admin. Inst.
InventorsMoriya Nakamura, Makoto Akiba, Toshiaki Kuri, Naoki Ohtani
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Abstract
A method of evaluating free-space optical propagation characteristics includes emitting a plurality of laser beams from a corresponding plurality of laser sources, receiving laser beams at different target points, and measuring the time-based spatial fluctuations between the laser beams thus received. The respective distances from the laser sources to each target point are used to normalize the time-based spatial fluctuations. The difference between the normalized spatial positions of the laser beams at the target points is derived and used to obtain the frequency spectrum of time-based fluctuations of the spatial positions.
Claims24
A method of evaluating free-space optical propagation characteristics, comprising the steps of emitting a plurality of laser beams from a respective plurality of laser sources;
- receiving respective laser beams at a first target point and a second target point and reading time-based spatial fluctuations between the laser beams received at the first and second target points;
- using a first distance from a first laser source to the first target point and a second distance from a second laser source to the second target point to normalize the time-based spatial fluctuations;
- deriving a difference between a normalized spatial position of a laser beam at the first target point and a normalized spatial position of a laser beam at the second target point;
- and obtaining a frequency spectrum of time-based fluctuations of the derived spatial positions.
Dependencies are inferred from the claim text.