We propose a noniterative digital backward propagation technique, based on an inverse modified Volterra series transfer function to postcompensate transmission linear and nonlinear impairments in the presence of optical noise. Using a single-channel 40-Gb/s nonreturn-to-zero quadrature phase-shift-keying optical signal propagated over 20 x 80 km of standard single-mode fiber, and performing digital postcompensa...
We develop a genetic algorithm for the topological design of survivable optical transport networks with minimum capital expenditure. Using the developed genetic algorithm we can obtain near-optimal topologies in a short time. The quality of the obtained solutions is assessed using an integer linear programming model. Two initial population generators, two selection methods, two crossover operators, and two popu...
We address the problem of generating physical realistic optical transport network topologies. This type of network has characteristics that differ from scale-free networks, such as the Internet. Based on the analysis of a set of real transport topologies, we identify and assess relevant characteristics. Amethod to generate realistic topologies is proposed. The proposed method is validated by comparing the chara...
The relation between the allowed range of variation of polarization controller wave-plates angles and the respective polarization scattering properties is investigated It is demonstrated that a nearly uniform polarization scattering over the Poincare sphere is obtained using a concatenation of three polarization controllers with angles randomly changed between -pi/4 and pi/4. It is also shown that an improvemen...
A detailed study of fiber-coil-based polarization controllers (PCs) is performed. First, a method to deterministically calculate the PC configuration in order to transform between any two states of polarization is presented. In a second stage, the case in which the configuration angles are randomly changed is studied. The cases of a single PC and of the system obtained with the concatenation of several PCs are ...
Nesta tese são abordados diversos tópicos relativos à implementação, análise e optimização de sistemas de comunicação ópticos baseados em solitões. São analisados os aspectos mais relevantes da teoria dos solitões para a sua utilização em sistemas de comunicação ópticos, colocando ênfase na análise da dinâmica dos solitões em sistemas com amplificação concentrada. O problema da geração de impulsos do tipo solit...
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