1,721,061 research outputs found
Polarization Scattering by Intra-Channel Collisions
No full textWe show that polarization modulated and polarization multiplexed transmission may be significantly impaired by the polarization scattering induced by intra-channel cross-phase modulation. In polarization multiplexed transmission, channel interleaving may be used to mitigate the effect when two-pulse collisions are dominant
Polarization Scattering by Intra-Channel Collisions in Phase-Modulated Transmission
No full textWe show that polarization modulated and polarization multiplexed transmission may be significantly impaired by the polarization scattering induced by intra-channel cross-phase modulation. In polarization multiplexed transmission, channel interleaving may be used to mitigate the effect
Statistical description of optical system performances due to random coupling on the principal states of polarization
No full text40-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 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
Single-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
Intrachannel nonlinearity enhancement in polarization multiplexed phase modulated systems with differential detection
No full textWe compare nonlinear impairments in phase-modulated transmission with and without polarization multiplexing. Using an analytic approach that enabled us to accurately predict the Q factor at the receiver, we show that, without polarization multiplexing, the differential receiver is insensitive to two-pulse cross phase modulation, whereas with polarization multiplexing two-pulse interaction between cross-polarized components causes significant performance degradation
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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