May 18, 1966
Benjamin J. Seabury, of RCA Laboratories, positions a photo-detector in the path of a light signal coming from the electroluminescent diode seen at left against the black rectangle.
Light pulses from the diode are carrying high fidelity music from the tape recorder at bottom. Thus, hi-fi sound can be carried on a light beam by means of intensity variations which it produces in the beam.
Such could be the basis of a small, economical, hand-held communications system or a means of providing electrical isolation in various high-frequency electronic circuits.
CORPORATION OF AMERICA
Original Caption by Science Service