Photonic bipolar modem for secure multi-channel communication
AssigneeNorthrop Grumman Corporation
InventorRichard L. Davis
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Abstract
A photonic arbitrary waveform modem utilizes a bipolar coding scheme. The bipolar coding scheme includes an arbitrary waveform modem which includes a plurality of tapped delay lines and is implemented by partitioning each optical frequency chip into positive and negative segments. Signals are decoded by effectively multiplying the transmit and receive code vectors and individually summing the positive and negative tap weights. The positive and negative tap weights are differenced to recreate the transmitted signal. The bipolar coding scheme allows for the use of truly orthogonal codes which decreases the interference and reduces the probability of detection.
Claims3
An photonic arbitrary waveform modem comprising:
- an arbitrary waveform transmitter including an optical modulator, optical source, a first symbol encoder, a plurality of tapped delay lines and an optical circular, where said symbol encoder configured to encode said waveforms with a first bipolar code to generate a first set of code vectors;
- and
- an arbitrary waveform receiver including a waveguide device, a second symbol encoder a plurality of tapped delay lines, a (+) detector and a (−) detector, said symbol encoder configured to generate a second set of code vectors, said waveguide configured to multiply said first and second codes vectors together and direct the result code to either said (+) detector or said (−) detector as a function of the product.
Dependencies are inferred from the claim text.