Péter Jeszenôi, Jenô Szatmári
Physical limits of the applicability of 10 and 40 Gbps speed DWDM systems
Due to the growing transmission demands and the technical evolution, the use of DWDM ystems that have more and more channels for the transmission of bundles of higher and higher speeds is spreading. In case of the application of 10 Gbps, but especially 40 Gbps systems, the dispersion characteristics of the optical fibres come to the focus of attention. Due to the high optical levels that can be provided with optical amplifiers, non-linear phenomena in the optical fibres can be observed. The imperfection of the passive optical devices used for the multiplexing/de-multiplexing of the wavelengths causes channel cross-talks. The aforementioned phenomena are in close relation with the high-speed transmission and they have to be taken into account when designing, installing and operating such systems. In general, the problems of the physical layer appear much more in case of high speed multiplex wavelength transmissions than as it used to be in case of known lower speed systems.