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Optical Communications Corp.

Loughrey R Kuhn

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.

Fiber optic data transmitting system

Fiber optic digital data transmitting system

A fiber optic digital data transmitting system transmitting and accurately reproducing digital data signals even when the optical signal is attenuated in the fiber optic transmitting medium. A composite signal is produced which is the sum of the amplitude of the data signal to be transmitted and a time varying signal which encodes each amplitude of the digital signal. At the receiver, the presence of each time varying signal is detected as a non-zero amplitude of the digital signal.

The specification discloses a transmitter and receiver set which operates so as to: pick up digital information as electrical impulses, such as information produced by a computer; translate this information into square-wave optical signals, which may be carried along optical fiber; amplify the electronic signal, as well as impress on the electronic signal an oscillation which is characteristic of the data signal alone; detect the said oscillations; and translate this detected signal into the standard electronic signal output.

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Silver Spring, MD, United States of America

Loughrey R Kuhn