Multichannel on a single wave laser over wave division multiplexing in free space optics using phase masks
First Claim
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1. A system, comprising:
- a laser configured to produce a laser beam;
a plurality of modulators, each optically coupled to said laser and configured to modulate one of a plurality of signals onto said laser beam;
a plurality of phase masks, each optically coupled to a respective one of said plurality of modulators and configured to pre-distort a pre-existing wavefront to produce one of a plurality of pre-distorted wavefronts to be transmitted over free space; and
a secure key transmitted over one of said plurality of modulated signals and configured to facilitate generation of a sequence according to which said plurality of modulated signals are switched among said plurality of pre-distorted wavefronts.
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Abstract
A system comprises a laser configured to produce a laser beam; a modulator optically coupled to said laser; and a phase mask optically coupled to said modulator. The phase mask may be configured to pre-distort a pre-existing wavefront to produce a pre-distorted wavefront to be transmitted over free space.
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Citations
25 Claims
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1. A system, comprising:
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a laser configured to produce a laser beam; a plurality of modulators, each optically coupled to said laser and configured to modulate one of a plurality of signals onto said laser beam; a plurality of phase masks, each optically coupled to a respective one of said plurality of modulators and configured to pre-distort a pre-existing wavefront to produce one of a plurality of pre-distorted wavefronts to be transmitted over free space; and a secure key transmitted over one of said plurality of modulated signals and configured to facilitate generation of a sequence according to which said plurality of modulated signals are switched among said plurality of pre-distorted wavefronts. - View Dependent Claims (2, 3, 4, 5)
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6. A system, comprising:
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a laser; an optical splitter optically coupled to said laser and configured to split a laser beam received from said laser into a plurality of laser beams; a plurality of signal modulators optically coupled to said optical splitter, each said modulator configured to; receive a laser beam from said splitter and one of a plurality of signals to modulate, and modulate said one of said plurality of signals onto said laser beam; a plurality of phase masks, each said phase mask optically coupled to one of said plurality of signal modulators and configured to pre-distort a pre-existing wavefront to produce one of a plurality of pre-distorted wavefronts to be transmitted over free space; and a secure key transmitted over one of said plurality of modulated signals and configured to facilitate generation of a sequence according to which said plurality of modulated signals are switched among said plurality of pre-distorted wavefronts. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14)
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15. A method, comprising:
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modulating a first of a plurality of signals onto a first light beam to produce a first pre-existing wavefront, a second of said plurality of signals onto a second light beam to produce a second pre-existing wavefront, and a secure key onto a third light beam to produce a third pre-existing wavefront, the secure key facilitating generation of a sequence according to which the plurality of signals are switched among a plurality of pre-distorted wavefronts; generating a transmission sequence according to the secure key used as an input to a mathematical function; and determining which of said plurality of signals to modulate as said first signal and which of said plurality of signals to modulate as said second signal according to said transmission sequence; pre-distorting said first pre-existing wavefront to produce a first pre-distorted wavefront and pre-distorting said second pre-existing wavefront to produce a second pre-distorted wavefront, and pre-distorting said third pre-existing wavefront to produce a third pre-distorted wavefront; combining said first, second and third pre-distorted wavefronts into a combined beam for transmission; and transmitting said combined beam by a transmitter. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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Specification