Secure fiber optic telecommunications system and method
First Claim
1. A fiber optic data transmission system comprising:
- a transmitter having a light source, a phase modulator for phase modulating the light source, and a controller for controlling the phase modulator as a function of an input electronic data stream and a second electronic data stream having a delay, the phase modulator creating a phase-modulated optical signal;
an optical fiber receiving the optical signal; and
a receiver receiving the optical signal from the optical fiber, the receiver having a splitter for splitting the optical signal into a first path and a second path, with a path length difference between the first path and second path being a function of the delay in the second electronic data stream.
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Accused Products
Abstract
A secure fiber optic data transmission system includes a transmitter having a light source, a phase modulator for phase modulating the light source, and a controller for controlling the phase modulator as a function of an input electronic data stream and a second electronic data stream having a delay, the phase modulator creating a phase-modulated optical signal. An optical fiber receives the optical signal and a receiver receives the optical signal from the optical fiber. The receiver has a splitter for splitting the optical signal into a first path and a second path. The second path has a second path length longer than the first path length, the second path length being a function of the delay in the second electronic data stream.
8 Citations
29 Claims
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1. A fiber optic data transmission system comprising:
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a transmitter having a light source, a phase modulator for phase modulating the light source, and a controller for controlling the phase modulator as a function of an input electronic data stream and a second electronic data stream having a delay, the phase modulator creating a phase-modulated optical signal;
an optical fiber receiving the optical signal; and
a receiver receiving the optical signal from the optical fiber, the receiver having a splitter for splitting the optical signal into a first path and a second path, with a path length difference between the first path and second path being a function of the delay in the second electronic data stream. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 17, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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15. An optical data transmitter comprising:
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a light source;
a phase modulator for phase modulating light from the light source; and
a controller controlling the phase modulator, the controller including a delayed-feedback exclusive-or gate.
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16. An optical data receiver comprising an interferometer, the interferometer having a first path and a second path propagating light at a delay with respect to the first path, the delay being a function of another delay imposed by a phase-modulator controller in a light-emitting transmitter.
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18. A method for transmitting secure data is also provided comprising the steps of:
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transmitting light from a light source in a transmitter;
electronically imposing a delay on an electronic data stream; and
phase modulating the light in the transmitter as a function of the imposed delay and an electronic data input stream.
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28. A fiber optic data transmission system comprising:
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means for phase modulating light as a function of an input electronic data stream and a second electronic data stream having a delay, thus creating a phase-modulated optical signal with encoded information for recovery;
means for transporting the optical signal, the transporting means being operably connected to the phase modulating light means; and
means for receiving the optical signal from the transporting means, the receiving means including an interferometer having a path length difference which is a function of the delay in the second electronic data stream.
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29. An optical data transmitter comprising a light source, a phase modulator for phase modulating light from the light source, and a controller for the phase modulator, the controller electronically altering an input electronic data stream as a function of an interferometric delay in a receiver.
Specification