Spectral and temporal stealthy fiber optic communication using sampling and phase encoding detection systems

A system for providing spectral and temporal stealthy information transmitted over an optical communication channel, comprising:

• a) a transmitter that includes:
• a.1) a Temporal Phase Encoder for reducing the power spectral density of a pulse sequence bearing said information by encrypting the temporal phase of said pulse sequence, thereby preventing the coherent addition of the temporal pulses in the frequency domain;
• a.2) a sampler for spreading the power of said pulse sequence in the frequency domain, to be below the noise level, by sampling said pulse sequence;
• a.3) a Spectral Phase Encoder for performing spectral phase encoding to temporally spread said pulse sequence and to prevent the coherent addition of its spectral replicas in frequency domain;
• a.4) circuitry transmitting the resulting signal, encrypted both in time and frequency domains;
• b) a receiver that includes:
• b.1) a Spectral Phase Decoder for performing spectral phase decoding followed by a coherent detector;
• b.2) a sampling circuitry for folding all the spectral replicas of the transmitted signal to the baseband, hence coherently adding all of its spectral replicas at the baseband and reinforcing the PSD of the signal;
• and
• b.3) a Temporal Phase Decoder, for reconstructing the PSD of the transmitted signal;
• and
• b.4) a sampler followed by a decision circuit which decodes the information that is delivered by the pulse sequence.