Performance characterization of a closed-loop chaotic communication system including fiber transmission in dispersion shifted fibers

Performance comparison of different dispersion management techniques in an all-optical closed-loop chaotic transmission system

“…At lower power values the decoding performance is degraded due to the ASE noise imported in each EDFA stage which is proportional to the amplifier gain. At higher power values the enhanced non-linear phenomena induce non-linear chirp to the propagating signal, which alters the phase characteristics of the chaotic signal arriving at the receiver and thus degrades the decoding performance quality 20 . The degradation becomes more important as the transmission distance increases permitting the efficient message recovery for at most 200Km in the case of CSK.…”

“…The second reason is that the OPC based dispersion compensation system provides also partial non-linear effects compensation, a very interesting characteristic for efficient all-optical chaotic transmission systems that is missing from the other two schemes. In a closed-loop chaotic system including fiber transmission, the non-linear frequency chirping induced to the transmitted chaotic signal arriving at the receiver, deform the intrinsic phase characteristics and is a limiting factor for the synchronization quality 20 . …”

“…On the other hand the first OPC module has reversed the phase characteristics ( fig. 6b) of the chaotic signal transmitted in the first half of the fiber link (SMF(L 1 )) and a new reversion is needed right before the receiver, since synchronization at the receiver is possible only if amplitude and phase characteristics of E ext and E r are identical 20,28 . As the wavelength of the transmitted wave in the first and the second middle of the fiber link is different, the chromatic dispersion parameter is also different in the two fiber segments.…”

“…Numerical simulation results including fiber transmission in a chaotic communications system have been reported in 14,19 where only DSFs have been considered and important transmission system features, like the amplified spontaneous emission (ASE) noise generated in erbium doped fiber amplifiers (EDFAs), have been neglected. Two new detailed studies 20,21 concerning fiber transmission in SMF employing dispersion compensating fibers (DCFs) and in DSFs, taking into account the fiber amplifiers noise characteristics, conclude that all-optical chaotic communication systems are extremely sensitive in fiber transmission impairments. The wide frequency bandwidth (several tens of GHz) and the fast amplitude variations in the time are two special characteristics of the chaotic signal which justify the low tolerance to chromatic dispersion and fiber nonlinearity respectively.…”

Performance comparison of different receiver configurations in an all-optical chaotic transmission system

“…all and SanchezDiaz et. All 9, 1 and more recently by Zhang et all, Bogris et all and Kanakidis et all [24][25][26] . In the present work, the performance of a chaotic communication system with fibre transmission included, when different receiver configurations are employed is investigated.…”