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- Advanced optical modulation and format conversionPublication . Dionísio, Rogério Pais; Teixeira, António; Nogueira, RogérioOver the years, the increased search and exchange of information lead to an increase of traffic intensity in todays optical communication networks. Coherent communications, using the amplitude and phase of the signal, reappears as one of the transmission techniques to increase the spectral efficiency and throughput of optical channels. In this context, this paper present a survey on format conversion of modulated signals using MZI- SOAs, based exclusively on all-optical techniques through wavelength conversion. We also present two proposal using all-optical techniques: One for the conversion of amplitude modulation signals to a continuous phase modulation format, and another technique for the conversion of OOK signals to QPSK and QAM signals. Both approaches are experimentally validated.
- Inherent fabrication yields and asymmetries impacts on MZISOA static modellingPublication . Parca, Giorgia; Dionísio, Rogério Pais; Reis, Cláudia; Betti, Silvello; Beleffi, Giorgio Tosi; Teixeira, AntónioThe characteristics of MZI-SOA are affected by its internal design yields and asymmetries, leading to an unbalanced power distribution at the output arms and difficult or non optimum biasing. Therefore, we propose an experimental methodology and model for MZI-SOA structures taking into account internal asymmetries as well as the internal SOA behaviour under different current both as what regards amplitude and phase.