Time-domain Fourier optics for polarization-modedispersion compensation

We report on a novel technique to compensate for all-order polarization-mode dispersion. By means of this technique, based on a suitable combination of phase modulation and group-velocity dispersion, we compensated for as much as 60 ps of differential group delay that affected a 10-Gbit/s return-to-zero data stream

40-Gb/s systems on G.652 fibers: comparison between periodic and all-at-the-end dispersion compensation

In the literature, two system solutions have been proposed to overcome high dispersion problems typical of G.652 fibers at high bit rates (40 Gb/s): they are periodic and all-at-the-end dispersion compensation. We carry out an exhaustive comparison between the two methods that, up to this moment, have been studied separately. In the first part, we introduce a simplified model on strong dispersion management (DM) with intrachannel four-waves mixing (IFWM) and intrachannel cross-phase modulation (IXPM). We then carry out extensive numerical simulations of a complete system in order to verify the results as a function of the input average power and of the input pulsewidth. Finally, we tackle a typical system aspect, i.e., the influence of nonlinear effects on dispersion compensating fibers (DCFs)

Impact of polarisation mode dispersion infield demonstration of 40Gbit/s solitontransmission over 500 km

40Gbitis single-wavelength altemate-polarisation soliton transmission over 5 0 0 h has been successfully demonstrated in a field trial using dispersion-shifted fibre. Comparisons with an equivalent laboratory trial and numerial simulations show that the main source of impairment is polarisation mode dispersion

The structure and activity of charcoal supported palladium catalysts. Part I. The formation and the structure of Pd particles

A study of the metal particles morphology and of their underlying structure, using Small Angle X-Ray Scattering (SAXS), Wide Angle X-ray Scattering (WAXS), Radial Distribution Function analysis (RDF) and Transmission Electron Microscopy (TEM) on several Pd/charcoal catalysts is reported. Different ranges for particle size dimensions have been reached with various methods of preparation. The catalysts samples Investigated were shown to have a broad or multimodal metal particle distribution whereas no abnormal atomic arrangement was observed as far as the atomic structure of the Pd clusters is concerned

The structure and activity of charcoal supported palladium catalysts Part II. Hydrides phase formation and activity of palladium charcoal catalysts in benzene hydrogenation

Some dependence has been found in turn over number for benzene hydrogenation over various Pd/Charcoal catalysts for metal particles below 40 Ǻ in sizes, approximately. In order to account for the above results attention was paid for their association with β Pd-H hydride appearance during the catalytic process, as detected in situ by X-ray diffraction analysis