Fiber optic data transmitting system

A transmitter for uase in a digital data transmitting system having a transmitter, an optical transmission medium and a receiver comprising:

• (a) means for producing a time varying signal which is time coincident with non-zero amplitude levels of a digital signal having zero and non-zero levels, the time varying signal being used to encode the occurence of the non-zero digital amplitudes of the digital signal;
• (b) means for combining two input signals into a composite output signal, the first input signal being from a source of a digital signal which is to be transmitted and the second input being coupled to the means for producing the time varying signal;
• (c) means for producing a beam of an optical carrier signal which is adapted to be coupled to the optical transmission medium used for transmitting the digital signal;
• and
• (d) means disposed within the beam which is responsive to the means for combining for modulating the beam with the composite signal.

A transmitter for use in a digital data transmitting system having a transmitter, a transmission medium and a receiver comprising:

• (a) means for producing a time varying signal which is time coincident with non-zero amplitude levels of a digital signal having zero and non-zero levels, the time varying signal being used to encode the occurrence of the non-zero digital amplitudes of the digital signal;
• (b) means for combining two input signals into a time coincident composite output signal, the first input signal being from a source of a digital signal and the second input being coupled to the means for producing the time varying signal;
• and
• (c) means coupled to the means for combining for modulating a carrier signal in accordance with the composite signal.

A digital data transmitting system comprising:

• (a) means for producing a time varying signal which is time coincident with non-zero amplitude levels of a digital signal having zero and non-zero amplitude levels, the time varying signal being used to encode the occurrence of the non-zero digital amplitudes of the digital signal;
• (b) means for combining two input signals into a time coincident composite output signal, the first input signal being from a source of a digital signal and the second input being coupled to the means for producing the time varying signal;
• (c) means coupled to the means for combining for producing a modulated optical carrier signal varying in amplitude in accordance with the composite signal;
• (d) an optical transmission medium having an input and an output, the input being coupled to the means for producing a modulated optical carrier signal;
• (e) means for detecting the modulated optical signal to produce a time varying signal which varies in accordance with the composite signal, the means for detecting being coupled to the output of the optical transmission medium;
• and
• (f) means for detecting the time varying signal, the detection of the time varying signal indicating reception of a digital signal of non-zero amplitude.

A digital data transmitting system comprising:

• (a) means for producing a time varying signal which is time coincident with non-zero amplitude levels of a digital signal having zero and non-zero levels, the time varying signal being used to encode the occurrence of the non-zero digital amplitudes of the digital signal;
• (b) means for combining two input signals into a time coincident composite output signal, the first input signal being from a source of a digital signal and the second input signal being coupled to the means for producing the time varying signal;
• (c) means for producing a beam of an optical carrier signal which is used for transmitting the digital signal;
• (d) means disposed within the beam which is responsive to the means for combining for modulating the beam of coherent electromagnetic energy with the composite signal;
• (e) an optical transmission medium having an input and an output, the input being coupled to the means for producing a modulated optical carrier signal;
• (f) means for detecting the modulated optical carrier signal to produce a time varying signal which varies in accordance with the composite signal, the means for detecting being coupled to the output of the optical transmission medium;
• and
• (g) means for detecting the time varying signal, the detection of the time varying signal indicating the reception of a digital signal of a non-zero amplitude.