Filtering technique for free space interconnects
First Claim
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1. A communication system comprising:
- a source of energy to propagate a signal along a communication path;
a detector positioned in the communication path; and
a filtering system disposed in the optical path;
the filtering system having first and second holographic optical elements each of which has a transform function associated therewith to encode the signal, defining an encoded signal, and decode the encoded signal to retrieve the signal for detection by the detector, with the transform function associated with said first holographic optical element matching the transform function associated with said second holographic element.
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Abstract
A filtering technique for a free space communication that features encoding and decoding of signals employing a filtering apparatus that includes a bulk holographic transform function. Employing the encoding and decoding technique facilitates providing a great number of channels of communication in a unit volume while preventing unwanted cross-talk between the communication channels. In addition, secure communication links between transmitters and receivers may be provided.
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Citations
20 Claims
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1. A communication system comprising:
a source of energy to propagate a signal along a communication path;
a detector positioned in the communication path; and
a filtering system disposed in the optical path;
the filtering system having first and second holographic optical elements each of which has a transform function associated therewith to encode the signal, defining an encoded signal, and decode the encoded signal to retrieve the signal for detection by the detector, with the transform function associated with said first holographic optical element matching the transform function associated with said second holographic element.- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A communication system comprising:
a source of energy to propagate a signal along a communication path;
a detector positioned in the communication path; and
a filtering system disposed between the source and the detector, the filtering system having first and second filtering apparatuses, each of which has a transform function associated therewith to encode the signal, defining an encoded signal, and decode the encoded signal to retrieve the signal for detection by the detector, with the transform function associated with said first filtering apparatus matching the transform function associated with said second filtering apparatus.- View Dependent Claims (16, 17)
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18. A communication system comprising:
- an array of optical transmitters to generate optical energy to propagate along a plurality of axes;
an array of optical receivers, each of which is positioned to sense optical energy propagating along one of the plurality of optical axes;
a first array of refractory lenses, each of which is disposed in one of the plurality of axes and having a transform function recorded throughout a volume, with the transform function associated with a subgroup of the lenses of the first array differing from the transform function associated with the remaining lenses of the first array of lenses and defining an encoding function to encode the signal, forming an encoded signal; and
a second array of refractory lenses, each of which is disposed between the first array of lenses and the array of optical receivers to collect the encoded signal, with a subset of the lenses of the second array having a second transform function recorded in recorded in a second volume thereof, to retrieve the signal by decode the encoded signal and directing the signal onto one of the optical receivers. - View Dependent Claims (19, 20)
- an array of optical transmitters to generate optical energy to propagate along a plurality of axes;
Specification