Miguel Pimenta

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We propose a flexible post-detection scheme for Group Velocity Dispersion compensation in multi-wavelength Optical CDMA systems. The compensator is based on embedding a specially designed distributed amplifier structure in the receiver preamplifier. This results in improved circuit and system reliability and reduced production and packaging costs.(More)
A novel circuit design technique for integrated circuits capable of encoding and decoding high-speed spread spectrum signals is proposed and verified by simulation. The transversal distributed topology allows operation at speeds close to the cut-off frequency of the transistors employed. Results describe a Monolithic Microwave Integrated Circuit (MMIC)(More)
We examine the effect of the optical fiber group velocity dispersion (GVD) on wavelength-hopping time-spreading (WHTS) optical code division multiple access (OCDMA) networks. We introduce a new and generic modeling methodology for multi access interference (MAI) and bit error rate (BER) estimation. This methodology is applicable to realistic networks with(More)
This work demonstrates the potential of electronic signal processing for applications in optical code division multiple access networks. The proposed designs are based in distributed topologies allowing operation at speeds close to the cut-off frequency of the transistors employed. We discuss structures capable of encoding and decoding time-domain and(More)
A novel structure that encodes and decodes very high speed unipolar Code Division Multiple Access (CDMA) signals is proposed. This scheme is based on the analogy between the distributed amplifier and the transversal filter. By adjusting the gain of each tap and the delay between taps, the proposed device acts as a high-speed encoder (transmitter) or(More)
We experimentally demonstrate a flexible electronic compensator for Group Velocity Dispersion induced time skewing in multi-wavelength Optical CDMA systems. The compensator uses a distributed transversal filter already proposed in the context of Optical Communications. Results show improvement in the ability to detect the autocorrelation peak in presence of(More)
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