Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1984-09-17
1986-12-02
Orsino, Jr., Joseph A.
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
455609, H04B 900
Patent
active
046271066
ABSTRACT:
A communications system employs a laser for producing a beam of spatially-coherent, monochromatic, aperture-limited electromagnetic optical energy. The beam is modulated with intelligence-bearing information to develop wavefronts of mutually-aligned orientation. The beam is directed through free space to impinge upon a surface reflective of the energy and exposed in a non-confined free space to the impingement of the beam. The beam is also focused upon the surface with the impingement of the beam being within the depth of focus and substantially at the waist of the region of focus of the beam. The information in the beam, as reflected by the surface at an angle thereto and with a mutually-aligned orientation of those wavefronts maintained, is detected. Finally, the information demodulated from the detection is derived and utilized.
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