Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1979-03-15
1980-07-01
Britton, Howard W.
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
350 9614, H04B 900
Patent
active
042108039
ABSTRACT:
Method and apparatus for signal transmission via an optical fiber transmission line comprising providing a first substantially monochromatic beam of radiation reserved as a carrier radiation beam, providing a second substantially monochromatic beam of radiation of preselected different frequency than the first substantially monochromatic beam of radiation frequency-interlocked with the first beam of radiation to a preselected degree dependent upon the transmission service to be effected reserved as an information radiation beam, imposing an electrical signal to be transmitted upon the information radiation beam, thereby responsively modulating the information radiation beam, combining the carrier radiation beam and the modulated information radiation beam, transmitting the combined radiation via the optical fiber transmission line to a preselected destination, and detecting the combined radiation with a square law detector to thereby obtain a subcarrier signal constituting the difference in frequency between the carrier radiation beam and the information radiation beam upon which the electrical signal is modulated as the beat frequency of the carrier radiation beam and the modulated information radiation beam, and demodulating to reconstitute the original electrical signal.
REFERENCES:
patent: 3920983 (1975-11-01), Schlafer
patent: 3962657 (1976-06-01), Redman
patent: 3975628 (1976-08-01), Graves
patent: 4033882 (1977-07-01), Fletcher
patent: 4063084 (1977-12-01), Goodwin
patent: 4146783 (1979-03-01), Desbois
patent: 4156135 (1979-05-01), Miller
Britton Howard W.
University of Delaware
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