Arrangement for the waveguide-free bidirectional light or infrar

Details Arrangement for the waveguide-free bidirectional light or infrar Arrangement for the waveguide-free bidirectional light or infrar

1991-02-05

1993-04-13

Coles, Sr., Edward L.

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359113, H04B 1000

Patent

active

052027813

ABSTRACT:
A waveguide-free, simultaneous, bidirectional optical transmission system is disclosed. Each device includes one oscillator for generating a frequency modulated signal. This frequency modulated signal is used for both transmitting a local information signal and for mixing a received modulated signal to produce an intermediate frequency signal of a fixed constant sum frequency. Each device has an FM discriminator for demodulating the intermediate frequency signal to produce a base band signal. Finally, a subtractor is supplied to each device for subtracting the local information signal from the base band signal to recover the received information signal.

REFERENCES:
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patent: 4792995 (1988-12-01), Harding
patent: 5121241 (1992-06-01), Veith
W. Hirschmann, "Lichttelefon", Elektor, May 1983, p. 5-53 to 5-52.
J. Stekelenburg, "Weitbereichs-IR Sender/Empfanger," Elektor Nov. 1987, pp. 52-57.
M. Skolnik "Radar Handbook", pp. 17-4 to 17-5; 19-6 to 19-7 (1970).
H. G. Unger, "Optische Nachrichtentechnik" Ch. 7 (1976).
W. Hoffmann, "Unterrichtsblatter" vol. 27, Jun. 1974 pp. 135-142.
H. Pooch, "Richtfunktechnik", pp. 13-16; 166-172 (1974).

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