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In this paper, we propose a new peak-to-average power ratio reduction technique based on a constant envelope orthogonal frequency division multiplexing (CE-OFDM) approach to mitigate fiber induced nonlinearities in direct-detection optical OFDM (DDO-OFDM) systems. Simulation results show that the proposed 10 Gbps DDO-CE-OFDM system using 16-quadrature(More)
323 Abstract— A novel method is presented to design the configuration of pumping lasers of Raman amplifiers using a multi-objective particle swarm optimizer. The goal is to obtain the pump laser wavelengths and powers that maximize the amplifier on-off gain, while maintaining the flatness of the gain over the used bandwidth. We used an algorithm called(More)
In order to reduce the cost for delivering the ever increasing broadband services, network providers need to simplify their network architectures and have a better control of the bandwidth. In this article, we propose a simple and cost-effective bandwidth scalable passive optical network (PON) based on orthogonal frequency division multiplexing(More)
A field trial of power line communication (PLC) with 200 Mpbs modems in a low voltage test grid is presented in this paper. Throughput and adaptivity to physical channel characteristics are some of the investigated functionalities in order to evaluate their appliance in medium voltage (MV) levels for onshore oil & gas industries. Experimental results(More)
— In this paper, we propose a hybrid methodology based on Graph-Coloring and Genetic Algorithm (GA) to solve the Wavelength Assignment (WA) problem in optical networks, impaired by physical layer effects. Our proposal was developed for a static scenario where the physical topology and traffic matrix are known a priori. First, we used fixed shortest-path(More)
The information systems that support Electronic Commerce on the Internet are becoming more common and complex. The complexity of these systems increases the need for new models with different degrees of abstraction in order to simplify the visualization of different aspects of the structure, constraints and operation of the software. In this paper we(More)
Due to the increase of bandwidth supported by optical transport networks, it becomes important to identify how reliable the actual real-world network topologies are, and the relationship of reliability with other key factors. Reliability is essential in this context, since the failure of elements such as fiber links and cross connects may cause the outage(More)