Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1995-12-29
1998-12-08
Bacares, Rafael
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
359182, H04J 1402
Patent
active
058478531
ABSTRACT:
A communication system including a light modulator system includes a laser that produces a high frequency carrier wave signal and a laser information signal source that produces a much lower frequency information signal. The carrier wave signal passes through a first pinhole in a screen to a light mixer cavity. The information signal passes through a second pinhole in the screen to the light mixer cavity, the signals being mixed in the light mixer cavity after passing through their respective pinholes. The resulting signal components include a sum of the carrier wave signal and the information wave signal. A pickup fibre is positioned and sized to receive and transmit only the sum of the carrier wave signal and the information wave signal. The pickup fibre is connected to the local end of a fibre optic cable. A light demodulator system at the remote end of the fibre optic cable includes a laser that produces a remote carrier wave signal that is mixed in another, similar light mixer cavity with the output of the fibre optic cable. The light signal components resulting from the mixing of the remote carrier wave signal and the fibre optic cable output signal are received by a light sensitive detector plate, which electronically outputs the components to a detector which is sensitive to the difference frequency between the remote carrier wave signal and the sum signal, to recover the information representative of the laser information signal.
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Bacares Rafael
Micro)n Technology, Inc.
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