Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1987-11-25
1989-05-16
Coles, Sr., Edward L.
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
455617, 455618, 370 3, 3701104, H04B 900
Patent
active
048316628
ABSTRACT:
A fiber optic digital data transmitting system is disclosed which has the capability of transmitting and accurately reproducing digital data signals at the receiver even when the optical signal is attenuated in the fiber optic transmitting medium. A composite signal is produced at the transmitter which is the time coincident sum of the non-zero amplitude of the digital data signal to be transmitted and a time varying signal which encodes each non-zero amplitude of the digital signal and other information. The composite signal modulates an optical carrier signal which is coupled to a fiber optic transmission medium which couples the transmitter to the receiver. At the receiver, the presence of each time varying signal is detected as a non-zero amplitude of the digital signal. Circuitry is are provided in the receiver for producing a pulse in response to the detection of each time varying signal for reproducing the transmitted digital signal and for detecting any information in addition to the non-zero amplitude of the digital signal which has been encoded in the time varying signal. The present invention is compatible with existing PCM systems which utilize threshold detection.
REFERENCES:
patent: 3238843 (1966-03-01), Heller
O. C. Jones "Methods of Modulating Light at Extreme Frequencies" Journal of Scientifial Instruments, vol. 41, Nov. 1964.
J. P. Noblanc "Fiber Optical Communication Devices" Applied Physic vol. 43, No. 3, Jul. 1977.
Coles Sr. Edward L.
Optical Communications Corp.
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