1,721,002 research outputs found
Single-channel transmission in dispersion management links in conditions of very strong pulse broadening: Application to 40 Gb/s signals on step-index fibers
No full textThe dynamic behavior of single-channel transmission on standard fibers with strong dispersion management has been theoretically and numerically analyzed. A single pulse and a pseudorandom pulse sequence have been compared in order to highlight the relevant role played by pulse interaction. A semi-analytical theory of the bandwidth evolution demonstrates that the introduction of prechirp is very important for controlling the single pulse propagation and numerical results show that such a chirp also permits to limit the nonlinear pulse interaction when other pulses are present. Simulations of a 40 Gb/s return-to-zero (RZ) system operating in links encompassing step-index fibers, by adopting a periodical compensation of the chromatic dispersion have been performed and results show that a record distance of 1300 km can be achieved with an amplifier spacing of 100 km. A compensation of the fiber third order dispersion would extend the transmission to 1800 km, which corresponds to the limits imposed by the amplified spontaneous emission (ASE) noise of the optical amplifiers
40-Gbit/s transmission in dispersion-management links with step-index fiber and linear compensation
No full textOptimal single-channel transmission can be obtained by simultaneously minimizing the nonlinear distortion of a single pulse and the nonlinear interaction among several pulses. This is demonstrated by numerical simulations based on a simple analytical theory of the chirp induced by the nonlinearity. The resulting fiber nonlinearity can be properly used to manage the pulse bandwidth evolution, allowing periodic behavior. As such, a 40 Gbit/s soliton signal can be transmitted over a record distance of 1800 km in a link that encompasses step-index fibers, with 100-km amplifier spacing and group-velocity-dispersion compensation by gratings
Light depolarization owing to amplified spontaneous emission and Kerr nonlinearity in long-haul fiber links close to zero dispersion
No full textSingle-channel transmission in dispersion managed links in conditions of very strong pulse broadening: application to 40 Gbit/s signals on step-index fibers
No full textSummary form only given. Dispersion management (DM) techniques to periodically compensate for fiber chromatic dispersion, /spl beta//sub 2/, has been shown to be a useful strategy for increasing the capacity of optical communication systems. We show that optimal propagation conditions can be obtained by simultaneously minimizing nonlinear distortion on single pulses and nonlinear interactions among the pulses. As a result, a 40 Gbit/s soliton signal can be transmitted over a record distance of 1300 km in a link encompassing step-index fibers, with 100 km amplifier spacing and GVD compensation by gratings. Theoretically, minimization of nonlinear distortion can be obtained by analyzing the pulse bandwidth variation along the link
Four-wave-mixing reduction in fiber links with zero chromatic dispersion by limiting pulse overlapping
No full textThe four-wave mixing (FWM) process is examined by considering pulsed signals. It is shown that improvements to the performance of this process can be achieved by compensating the TOCD at the amplifier output and by using unequal delays among the channels
Strong time jitter reduction using solitons in "1/z" dispersion managed fiber links
No full textWe propose and study a novel dispersion management method that permits the propagation of soliton pulses with a very low time jitter. The scheme assumes a chromatic dispersion that on average decreases with a 1/z law, where z is the propagation distance. The advantage of this method consists in the fact that at the end of the link the mean chromatic dispersion is very small and as a consequence the jitter can be deeply reduced, while at the beginning of the link the chromatic dispersion is high, hence the system can operate with a large input power that permits a good signal to noise ratio. The scheme is simply implemented by periodically compensating the chromatic dispersion with fiber pieces having different lengths. © 1998 Elsevier Science B.V. All rights reserved
- …
