Spectral and temporal stealthy fiber optic communication using sampling and phase encoding detection systems
US9288045B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Jul 17, 2012 |
| Grant date | Mar 15, 2016 |
| Priority date | — |
| Expiry date | Jul 17, 2032 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04K1/04
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A method for providing spectral and temporal stealthy information transmitted over an optical communication channel, according to which, at the transmitting side, the power spectral density of a pulse sequence bearing the information is reduced by encrypting the temporal phase of the pulse sequence. The power of the pulse sequence is spread in the frequency domain, to be below the noise level, by sampling the pulse sequence. Spectral phase encoding is used to temporally spread the pulse sequence and to prevent coherent addition of its spectral replicas in frequency domain. The resulting signal, encrypted both in time and frequency domains, is then transmitted. Spectral phase decoding is performed at the receiving side by performing coherent detection and folding all the spectral replicas of the transmitted signal to the baseband by means of sampling. The temporal phase of the signal is decrypted and the information which is delivered by the pulse sequence is decoded.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.