Redes ópticas flexíveis: análise de desempenho em sistemas ópticos de altas taxas.

Abstract

This work aims the analysis of channel allocation in flexible optical networks, defining optimized allocation plans for transmission trough the comparative analysis of different scenarios. Flexible optical networks is a topic of current intense research activity, the traffic in these networks consists of different modulation formats and transmission rates, an inevitable scenario in the current and future optical information transmission systems. Different effects are responsible for signal degradation in flexible networks, such as the interference between neighboring channels (crosstalk), the passband narrowing effect due to the cascading of optical filters in the system and the optical signaltonoise ratio (OSNR) degradation. After simulations, the numerical results obtained were analyzed taking into account the degrading effects to the system. Finally, the optimal allocation methods which do not penalize the system and present the best use of the available optical spectrum are determined. The evaluated scenarios in this work used two types of modulation formats, the OOK (OnOff Keying) and the DPQPSK (Dual Polarization Quadrature Phase Shift Keying), with transmission rates of 10 and 100 Gb/s, respectively. The 10 Gb/s OOK channels are still commonly used in current optical transmission systems, while the DPQPSK is a newer modulation format standardized by OIF (Optical Internetworking Forum) for optical transmission at 100 Gb/s.