Theoretical studies on optical fiber secure communication using chaotic phase encoding

In this paper, we present the synchronization of chaotic injected semiconductor lasers in an optical fiber system via phase-controllers controlling its lasing phase shift, and a theoretical model for optical fiber chaotic secure communication system via chaos phase shift modulation by coupling a chaotic laser phase controlled synchronization system and an optical fiber channel. Chaotic synchronization is realized numerically under phase-controllers controlling in a long-haul optical fiber system. Optical fiber chaos propagation formula is demonstrated by analyzing theoretically the effect of optical fiber self-phase modulation on chaotic signal and synchronization. Chaotic laser phase shift is controlled and its signal is transmitted via continuous chaos shift keying modulation on end for optical fiber communication encoding. Chaotic laser demodulation is achieved via setting a phase shift of the receiver phase-controllers for optical fiber communication decoding. Application of chaotic digital encoding of 50Mbit/ s rate is simulated numerically for long-haul optical fiber secure communication. The system parameter mismatch and robustness of anti-noise are analyzed numerically in long-haul optical fiber propagation.