Rafael Vilar

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A novel all-optical OFDM demultiplexer based on integrated photonic ring resonators (RR) is proposed and its performance validated. The proposed optical OFDM demultiplexer overcome the processing speed limits introduced by electronics and is suitable for very large scale integration, providing a compact and cost-effective solution. The performance of this(More)
The increasing demand in the Internet network for real-time multimedia data traffic with high quality is pushing the limits of existing network structure. Optical packet switching (OPS) is considered as an attractive technology for future optical networks. Due to the high transmission capacity, network management is becoming more and more important. In this(More)
A novel optical time-to-live (TTL) method based on the use of logic XOR gates is proposed. All-optical decrementing of a packetpsilas TTL field is shown employing a cascade of two SOA-based Mach-Zehnder interferometers. The principle of operation is validated by means of simulations, showing a good extinction ratio (higher than 10 dB) at the output of the(More)
The objective of the work consists in the design and implementation of techniques of automatic recognition of weld regions. It is aimed to complete a system of automatic inspection of radiographic images of welded joints. It deals with the problem of the delimitation of the weld regions according to the general scheme of image interpretation systems based(More)
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