Laser signal mixer circuit

Details Laser signal mixer circuit Laser signal mixer circuit

1989-03-30

1990-09-25

Crosland, Donnie L.

Multiplex communications

Wide area network

Packet switching

370 1, 455609, 455611, 358226, 358142, H04B 900

Patent

active

049598279

ABSTRACT:
A circuit for mixing audio, video and data signals for transmission by laser link. The data signal is first modulated by frequency shift keying and then, after passing through a bandpass filter, is mixed with the audio signal and then frequency modulated at about 12 MHz. The combined signal is then mixed with the 70 MHz frequency modulated video signal, but each signal is isolated from the mixed signal by an appropriate filter so that each signal is not fed to the other source.

REFERENCES:
patent: 2284706 (1942-06-01), Wiessner
patent: 3727185 (1973-04-01), Jones
patent: 3733438 (1973-05-01), Haley
patent: 3917906 (1975-11-01), Johnson
patent: 4054794 (1977-10-01), Laughlin
patent: 4061577 (1977-12-01), Bell
patent: 4689826 (1987-08-01), Smith
patent: 4700352 (1987-10-01), Shikada
patent: 4723310 (1988-02-01), DeCorlieu et al.

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