Patent ID: 7720226
Filing Date: 2010-05-18
Classification: H04B,H04K

Abstract:
1. A method for secure transmission of an information-containing optical signal in a reflective/transmissive architecture, comprising: dividing the optical signal using an optical tapped delay line into a first plurality of spectral sub-bands defined by the equation: where modifying each of the first plurality of spectral sub-bands to encrypt the information contained in the optical signal by at least one of (i) imparting a phase shift to each sub-band, (ii) imparting a time delay to each sub-band, and (iii) imparting a frequency shift to each sub-band, combining the modified first plurality of spectral sub-bands into a combined optical signal, dividing the combined optical signal into a second plurality of spectral sub-bands, modifying each of the second plurality of spectral sub-bands to decrypt the previously encrypted information contained in the optical signal by at least one of (i) imparting a phase shift to each sub-band, (ii) imparting a time delay to each sub-band, and (iii) imparting a frequency shift to each sub-band.